Title of Invention

"A TRANSMISSION DEVICE AND A GATED TRANSMISSION METHOD FOR A MOBILE STATION IN A CDMA COMMUNICATION SYSTEM"

Abstract This invention relates to a base station and a mobile station for a CDMA communication system intermittently exchange data on a power control group unit or time slot unit in a control hold state to minimize interference. To this end, during channel transmission, the system intermittently transmits a reverse pilot channel signal in the control hold state; upon activation of a reverse dedicated control channel, transmit a normal pilot channel signal which is first generated after activation of the reverse dedicated control channel; and then transmits the reverse dedicated control channel.
Full Text BACKGROND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to CDMA mobile communication systems, and in particular, to a device and method for performing gated transmission (or intermittent transmission) in a control hold state.
2. Description of the Related Art
A conventional Code Division Multiple Access (CDMA) mobile communication system based on the IS-95 standard primarily supports a voice service. However, a mobile communication system in accordance with the IMT-2000 standard will support not only the voice service, but also a high-speed data transfer service. For example, the IMT-2000 standard can support a high-quality voice service, a moving picture service, an Internet search service, etc.
In a mobile communication system, a data communication service is characterized in that transmissions of burst data alternate with long non-transmission periods. Therefore, for the data communication service, a mobile communication system employs a channel
1A

assignment method in which a dedicated channel is assigned for only the data transmission duration. That is, taking into consideration the limited radio resources, base station capacity and power consumption of a mobile station, the mobile communication system connects a traffic channel and a control channel only for an actual data transmission duration and otherwise releases the dedicated channels (i.e.. the traffic channel and the control channel) when there is no data to transmit for a predetermined time. When the dedicated channels are released, communication is performed through a common channel, thus increasing utility efficiency of the radio resources.
A conventional CDMA mobile communication system which mainly supports the voice service, releases a traffic channel upon completion of data transmission and then, reconnect the traffic channel when it is required to transmit data However, the conventional channel assignment method is not suitable for a packet data service because of a time delay for reconnection of the channel. Therefore, to provide the packet data service as well as the voice service, there is required a new channel assignment method.
In general, during the packet data service, data transmission occurs intermittently. Therefore, a transmission duration of packet data alternates with periods of non-transmission. The mobile communication system either releases or maintains a channel in use for the periods of non-transmission, However, there are drawbacks associated with both maintaining and releasing a channel, namely, release of the channel causes an increase in service time due to a time delay for reconnection of the channel, and maintaining the channel causes a waste of the channel resources.
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To solve these problems, there is proposed a method in which a dedicated control channel is provided between a base station and a mobile station to exchange traffic channel-related control signals over the dedicated control channel for the data transmission duration; and release the traffic channel and maintain only the dedicated control channel for the non-transmission duration. In this manner, the mobile communication system can prevent a waste of the channel resources and rapidly reconnect the traffic channel when there is data to transmit. The operating state described above is called a control hold state.
The mobile communication system includes additional operating states according to the channel assignment. FIG. 10 illustrates a state transition diagram of a mobile communication system for the packet service.
As shown in FIG. 10, for the packet service, the state transition diagram for the packet service illustrates a packet null state, an initialization state, an active state, a control hold state, e suspended state, a dormant state and a reconnect state. In the control hold, active and suspended stales, a service: option is connected and in the other stales, the service option is not connected.
Further, the control hold state can be divided into a normal substate and a slotted substatej. as shown in FIG. 11. The normal substate refers to a state where there is no data to transmit over a traffic channel and only a control signal is exchanged over a dedicated control channel. When the normal substate continues for a predetermined time, (i.e., when onlythe control signal is exchanged for a predetermined time without transmission of data). a transition to the sletted substate occurs. The slotted substate refers to a state where
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connection of the dedicated control channel is maintained but no control signal is exchanged over the dedicated control channel to reduce power consumption of a mobile station-However, to make a transition from the slotted sub state to the normal subslate to restart data transmission, resynchronization should be performed between a base station and a mobile station, since no control signal is exchanged between the base station and the mobile station in the slotted substate.
A reference will now be made to a base station and a mobile station for (he conventional CDMA communication system which performs the above operations. FIG. 1A illustrates a conventional base station transmitter in a CDMA communication system.
With regard to forward link channels, the base station includes a pilot channel for sync acquisition and channel estimation, a forward common control channel (F-CCH) for communicating a control message in common to all the mobile stations located in a cell (or service) area of the base station a forward dedicated control channel (F-DCCH) for exclusively com municating a control message to a specific mobile station located in the cell area of the base suition, and a forward dedicated traffic channel (F-DTCH) for exclusively communicating traffic data (i.e., voice and packet data) 10 a specific motile station located in the cell area of the base station. The forward dedicated control channel includes sharable forward dedicated contro. channel (sharable F-DCCH) for exclusively communiceting a control message to a specific mobile station by time slot muttiplexing. The forward dedicated traffic channel includes a forward fundamental channel (F-F OH) and a forward supplemental channel (F-SCH).
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Demultiplexers 120, 122, 124 and 126 demultiplex corresponding channel-coded interleaved channel information to I and Q channels. Here, serial-to-parallel converters can be used for the demultiplexers 120,122,124 and 126. It is assumed herein that signals input to the demultiplexers 120, 122, 124 and 126 arc signal-mapped signals. Mixers 110. 130, 131, 132, 133, 134. 135, 136 and 137 multiply signals output from the associated demultiplexers by orthogonal codes assigned to the corresponding channels to orthogonally spread the signals output from the associated demultiplexers. Here, each of the mixers 110 nnd 130-137 serves as an orthogonal modulator. The orthogonally spread signals output from the mixers 130-137 are gam controlled by associated amplifiers 140-147.
Signals output from the amplifiers 140-147 and the mixer 110 are summed by summers 150 and 152 according to the 1 and Q channels. Since the signals applied to the summers 150 and 152 were channel separated by the orthogonal codes, the respective channel signals are orthogonal to one another. Outputs of the summers 150 and 152 are multiplied by PN (PSCIKIO Noise) sequences PN (and PN#Q assigned to the base station for .base station identification in a complex multiplier 160
I and Q channel signals output from the complex multiplier 160 arc applied to filters 170 and 171. respectively, which bandpass filter the input signals to output bandwidth-suppressed signals. The outputs of the filters 170 and 171 arc amplified by amplifiers 172 and 173. Mixers 174 and 175 multiply outputs of the amplifiers 172 and 173 by a carrier cos(2 ft) to up-convert the signals to radio frequency (RF) signals. A summer 180 sums the
I add Q Channel Signals
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FIG. 1B illustrates a conventional mobile station transmitter for the conventional CDMA communication system. With regard to reverse link channels, the mobile station includes a pilot/PCB (Power Control Bit) channel for multiplexing a pilot channel for sync acquisition and channel estimation and a forward power control bit for forward power control, a reverse dedicated control channel (R-DCCH) for exclusively communicating a control message to a base station, in a cell area of which the mobile station is located, and a reverse dedicated traffic channel (R-DTCH) for exclusively communicating traffic data to the base station Further, the reverse dedicated traffic channel includes a reverse fundamental channel (R-FCH) and a reverse supplemental channel (R-SCH).
A multiplexer 210 multiplexes a signal on the reverse pilot channel and a power control bil for controlling power of the forward link. Mixers 220, 230, 240. 250 and 260 multiply corresponding channel-coded interleaved signals received over the respective reverse channel by orthogonal codes assigned to the corresponding channels to generate orthogonally spread signals for the respective channels. Outputs of the mixers 220,240,250 and 260 arc gain controlled by amplifiers 222.242. 232 and 262. respectively.
A summer 224 sums outputs of the amplifiers 222 and 242 and an output of the multiplier 230, and u summer 254 sums outputs of the amplifiers 252 and 262. Since the signals applied to the summers 224 and 254 were channel separated by the orthogonal codes, the respective channel signals are orthogonal to one another. A cemplex spreader for complex multiplier) 160 multiplies signals output from the summers 27.4 and 254 by a spreading code assigned to the mobile station to spread the signals. The spreading code assigned to the mobile station is generated by mixing a PN sequence for a base station, in
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the cell area of which the mobile station is located, by a unique long code for the mobile station. Filters 170 and 171 filter I and Q channel signals output from the complex spreader 160. respectively, to generate bandwidth suppressed signals. Amplifiers 172 and 173 amplify outputs of the filters 170 and 171, respectively. Mixers 174 and 175 multiply signals output from the amplifiers 172 and 173 by a earner cos(2f ct) to up-convert the transmission signals to RF signals. A summer 180 sums the 1 and Q channel signals output from the mixers 174 and 175.
In the control hold state of the conventional CDMA communication system, a dedicated traffic channel is released and a control signal is communicated over a dedicated control channel. A description will be provided regarding the operation of a reverse pilot/PCD channel in the control hold state. Herein, it is assumed that the control hold state is divided into a normal substate and a slotted substate. However, even in the case where the control hold state is not divided into the normal substate and the slotted substate, the reverse pilot/PCB channel will have the same operation
First, a mobile station constantly transmits a signal on the reverse pilot/PCB channel in order to avoid resync acquisition performed at a base station during a transition from the control hold state/normal substate (i.e., a normal substate of the control hold state) to the active state in a conventional CDMA communication system. The reverse pilot/PCB channel discontinues transmission only when a transition to the control hold stale/slotted substate (i.e., a slotted substate of the control hold state) occurs. However, the signal on the reverse pilot/PCB channel is continuously transmitted until the occurrence of the transition to the slotted substate occurs, thereby increasing interference of a reverse link in the normal
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subscatc of the control hold stale. The increase in interference of the reverse link inevitably decreases a capacity of the reverse link. Further, the unnecessary continuous transmission of the control signal pauses an increase in power consumption.
Second, a description will be made regarding an operation for generating a reverse dedicated control channel (R-DCCH) when a reverse dedicated MAC (Medium Access Control) channel is generated in the conventional control hold state/normal substaie. Logical channels for the reverse dedicated control channel include a dedicated MAC channel (dmch), a dedicated signalingchanncl (dsch)and a dedicated traffic channel (dtch) The dsch and dtch each have a 20ms frame and the dmch has a 5ms frame Therefore, after generation of the dmch, an R-DCCH can be transmitted within 5ms in maximum. Accordingly, the R-DCCH can be transmitted to locations which correspond to multiples of 5ms. Therefore, when the dmch is transmitted, the base station may determine the existence of the R-DCCH only at four locations within one frame. However, after generation of the dmch, the R-DCCH is transmitted with a lime delay of 5ms in maximum. The dmch has 2.5ms transmission delay on the average.
Third, in the case where revers-e power control bits are disposed at fixed locations on a forward channel when the R-DCCH is not activated in the conventional control hold state/normal substate, both forward power control and reverse power control are performed at the same periods. Further, in the case where the reverse power control bits are disposed at variable locations within a power control group on the forward channel when the R-OCCH is not activated in the conventional control hold state/normal substate both reverse power control and forward power control arc performed at the same periods.
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As staled above, the continuous transmission of the reverse pilot/PCB channel in the conventional control hold state/normal substate is advantageous in that the base station can avoid the resyne acquisition procedure. However, the continuous transmission increases interference of the reverse link, causing a reduction in capacity of the reverse link. Further, continuous transmission of the reverse power control bits over the forward link causes an increase in interference of the forward link and a decrease in capacity of the forward link, in addition, the continuous transmission of the reverse power control bits may increase power consumption.
Therefore, there is a need for a method capable of suppressing unnecessary transmission of a control signal in the control hold state so as to (1) minimize resync acquisition time; (2) minimize interference due to transmission of the reverse pilot/PCB channel, and (3) minimize interference due to transmission of reverse power control bits over the forward link.
SUMMARY OF THE INVENTION
It is. therefore, an object of the present invention to provide a device and method for suppressing the unnecessary transmission of a control signal in a control hold state in a COMA communication system.
It is another object of the present invention to provide a device and method for performing gated transmission by intermittenily ivarismittinw a control signal in a control hold state in a CDMA communication system
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It is a further object of the present invention to provide a device and method for receiving a control signal transmitted intermittently in a control hold state in a CDMA communication system.
Tt is a still further object of the present invention to provide a device and method for intermittently transmitting a control signal on a power control group unit basis in a control hold state in a CDMA communication system.
ft is yd another object of the present invention to provide a device and method for intermittently transmitting a control signal on a time slot unit basis in a control hold state in a CDMA communication system.
It is a still further object of the present invention to provide a device and method for intermittently transmitting a control signal on a frame unit basis in a control hold state in a CDMA communication system.
It is another object of lite present invention to provide a device and method for controlling transmission power in the case where reverse power control bits are disposed at fixed locations, when a reverse dedicated control channel is activated in a control hold state in a CDMA communication system which intermirteutly transmit control signal.
It is a further object of the present invention to provide a device and method for controlling transmission power in the case where reverse power control bits, are disposed at variable locations within a power control group where a reverse dedicated control channel
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is activated in a control hold state in a CDMA communication system which intermittently transmits a control signal.
It is yet another object of the present invention to provide a device and method for transmitting a reverse power control command for multiple reverse channels in a control hold state in a CDMA communication system which intermittently transmits a control signal
It is another object if the present invention to provide a device and method for generating a reverse transmission signal to implement a time diversity in transmitting traffic tata using a reverse dedicated control channel in a control hold state in a CDMA communication system which intermittently transmits H control signal.
It s yet another objet of the present invention to provide a device and method for generating a transmission signal to implement a time diversity in transmitting traffic data using a forward dedicated control channel in a control of hold state in a CDMA communication system which intermittently transmits a control signal.
It is yet another object of the present invention to provide a device and method for performing gateu transmission when there is no user data to transmit.
It is yet another object of the present invention to provide a device and method for intermittently transmitting a signal required to maintain a channel so as to maintain a stale of the channel with a minimum signal at a dura lion where there is no data to exchange in a CDMA mobile communication system.
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In accordance with one aspect of the present invention, a transmission device for a mobile station in a CDMA communication system includes a channel signal generator for generating a pilot channel signal for a reverse link, and a gating controller for intermittently transmitting the pilot channel signal generated from the channel signal generator according to a predetermined gating rate in a control hold state. The transmission device further includes a dedicated control channel signal generator for puncturing a control message to be transmitted and inserting power control information for controlling transmission power of a reverse link in the punctured message, and a gating controller for intermittently transmitting the power control information from the dedicated control channel generator according to a predetermined gating rate in a control hold state.
BRIEF DESCRIPTION OF THe AccompanyingdRAWINGS
The above and other objects feat and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference numerals indicate like parts. In the drawings.
FIG. IA is a diagram illustrating a base station transmitter for a conventional CDMA communication system;
FIG 1B is .. disgram illustrating a mobile station transmitter for a conventional CDMA communication system.:
FIG 2A is a diagram illustrating a base station transmitter for a CDMA communication system according to an embodiment of the present invention
FIG. 2B is a diagram illustrating a mobile station transmitter for a CDMA
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communication system according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating; various methods for transmitting a reverse pi lot/PCB channel in a control hold state in a CDMA communication system according to an embodiment of the present invention;
FIG. 4A is a diagram illustrating a method for transmitting a reverse pilot/PCB channel upon activation of a reverse dedicated control channel in a control hold state according to on embodiment of the present invention, therein the reverse dedicated control channel can be comprised of power control groups and the pilot/PCB channel is intermittently trransmitted at regular intervals;
FIG. 4B is a diagram illustrating a method for transmitting a reverse pilot/PCB channel upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the reverse dedicated control channel can be comprised of dedicated control channel frames and the pilot/PCB channel is intermittently trransmitted at regula intervals:
FIG. 4C is a diagram illustrating a method for transmitting a reverse pilot/PCB channel upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the reverse defeated control channel can be comprised of power control groups and the pilot/PCB channel is intermittently transmitted at irregular intervels-
F1G. -4D is a diagrm illastrating a a reverse pilot/PCB channel upon activation of s reverse dcdicated control cacele in a octrol hold state according to an embodiment of the present invention, wherein the reverse dedicated control channel can be comprised ot power control groups and the pilot/PCB channel is intermittently transmuted at regular intervals at multiple locations within one frame in a unit
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of multiple times the power control group;
FIG 4E is a diagram illustrating a method for transmitting a reverse pilot/PCB channel upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the reverse dedicated cental channel can be comprised ot power control groups end the pilot/PCB channel is interminently transmitted at regular intervals 11 u single location within one frame in a unit of mult file times the power control group,
FIG IF is a aiagtux illustrating a method for transmitting a reverse pilot/PCB channel upon activition 0f a rtverst; dedicated control channel in a control /mid state according to an embodiment of the present invention, wherin the reverse dedicated control channel can be comprised of power control group?, the pilot/PCB channel is intennittcntiy transmitted at regular intervals, and only one time slot of the pilot/PCB channel is additionally transmitted alter trans mission of the reverse dedicated control channel;
FIG. 40 is a diagram illustrating a method for transmitting a reverse pilot/PCB channel upon activation of a reverse dedicated control channel ir s control hold state according 10 "n TmjodM"mr nf "hr pT^eni !rver*ti'*n '.vnrrein !*"e reverse dedicated control char.nr.i ¦.";" oi cf..r.. ri":ii ^nr.wcr ixmt-o! g" txipc., ^-t jsmitted for a remaining frame duration after transmission of the reverse dedicated control channel;
FIG. 4H is a diagram illustrating a rr.rthod for transmitting a rt*.erse pilot/PCB channel upon activation of a reverse dedicated control channel in a control hold state according to an rrabotl'incnt of the nr£s"rt nvertion. \"Kttj- *li" pi!o;/?CB channel ts in'.ettii iviu.:!Tiit";\111'. rs[*ulii/ inte;1. his;
fl(i I : ;. iliijii-jii iluvutido K rieti"' liti trv^sni'Uiiig a inverse pilot/PCB
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channel upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at irregular intervals;
FIG. AS is a diagram illustrating a method for transmitting a reverse pilot/PCB channel upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at regular intervals at multiple locations within one frame in a unit of multiple times a time slot:
FIG. 4K. is a diagram illustrating a method for transmitting a reverse pilot/PCB channel upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the pilot PCB channel is intermittently transmitted at regular intervals u a single legation within one frame in a unit of multiple limes a time slot;
FIG. 5A is a diagram illustrating a power control operation for a reverse pilot/PCB channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermiuCaUy transmitted at regular intervals and a duty cycle is Wl and 1/2;
FIG. 5B is a c'agram Must re tin $; a power contra! operation for a reverse pilot/PCB channel in a contra! held slat z according to ar. embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at regular intervals and a duty cycle is 1/4 and 1/8;
FIG. 5C is a diagram illustrating a power control operation for a reverse pi lot/PC B channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at if tegular intervals and a duty cycle is
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1/1 and 1/2;
FIG. 5D is a diagram illustrating a power control operation for a reverse pilot/PCB channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at irregular intervals and a duty cycle is 1/4 and 1/8;
FIG. 6A is a diagram illustrating a power control operation for a reverse pilot/PCB upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at regular intervals. offset FIG. 6B is a diagram illustrating a power control operation for a reverse pilot/PCB upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermittenty transmitted at regular intervals. offset FIG. 6C is a diagram illustrating a power control c^"t st\H FIG. 6D is a diagram illustrating a power control operation 'or n reverse pilot/r\Za upon activation of a reverse dedicated control channel in H 2antvo\ t:cid ante accratiin^ io an embodiment of the present invent-on, wbcrem 'be pilot/PCB channel is intermittently transmitted at regular intervals, offsei>0, and a duty cycle is T4 Mij 1/8
FJG. 6E is a diagram illustrating a power control operation for a reverse pilotT'CB upon activation of a reverse dedicated control channel in a control ho'd stste according to an embodiment of the present invention, wherein the pilci-i'CH channel is ;n\T/r.itt<::ii> - 16 -

transmitted at regular intervals, offactO, and a duty cycle is I'l and 1/2;
FIG. 6F is a diagram illustrating n power control operation for a reverse pilot/PCB upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at regular intervals, off"ct FIG. 6G is a diagram illustrating a power control operation for a reverse pilot/PCB upon activation of a reverse dedicated control channel in a control hold state according to on embodiment of the present invention, wherein the pilot/PCB channel is intermittently transmitted at regular intervals. offset>0, and a duty cycle is if I and 1/2;
FIG. 6H is a diagram illustrating a power control operation for a reverse pilot/PCB upon activation of a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein the pilot/PCfl channel is intermittently transmitted at regular intervals, offsetX), and a duty cycle if K4 a*1 \tt
FIG. 7A is a diagram illustrating a reverse ^ower control prr^edure fo' multiple reverse dedicated control channels using a shamble forward dedicate-; control chRnnel in a control hold state according to an embodiment of the present invention;
FIG. 7B is a diagram illustrating reverse power control commands for multiple reverse channels of FIG. 7A according to an embodiment of the present invention,
FIG 1C is a diagram illustrating reverse power control command.* fur multiple reverse channels of FIG 7A according to another embodiment of the present invention;
FIG. 8A is a diagram illustrating a reverse transmission signal for implementing a time diversity in transmitting traffic data using u reverse dedicated control channel in a control hold state according to an embodiment of ilic present inversion, v/rienin reverse power cotitrr^! bits arr regularly located;
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FIG. SB is a diagram illustrating a reverse transmission signal for implementing a time diversity in transmitting traffic data using a reverse dedicated control channel in a control hold state according to an embodiment of the present invention, wherein reverse power control bits arc irregularly located;
FIG. 9A is a diagram illustrating a continuous transmission signal transmitted at regular intervals, for implementing a time diversity in transmitting traffic data using a forward dedicated control channel in a control hold state according to an embodiment of the present invention;
FIG. 9B is a diagram illustrating a discontinuous transmission signal transmitted at regular intervals, for implementing a time diversity in transmitting traffic data using a forward dedicated control channel in a control hold stale according to another embodiment of the present invention;
FIG. °C is a diagram illustrating a discontinuous transmission signal transmitted at irregular intervals, for implementing a time diversity in transmitting traffic data using a forward dedicated control channel in a control hold state according to an embodiment of the present invention;
FIG. 10 is a state transition diagram for a packet data service in a CDMA communication system; and
FIG. 11 is a diagram illustrating a state transition occurring between substates of a control hold state in a CDMA communication system.
DETAILED DESCRIPTION OFTHE PREFERRED EMBODIMENTS
Preferred embodiments of ihe present invention will be described ncrc;n x;ow> vith
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reference to the accompanying drawings. In the following description, well known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
In an embodiment of a COMA communication system, a control signal is intermittently transmitted when there is no user data to transmit. Here, the control signal includes a power control bit (PCB) being transmitted over a forward channel, and a pilot signal and a power control bit being transmitted over a reverse link. Therefore, in accordance with the embodiment, a control signal is intermittently transmitted in a control hold state, thereby minimizing resync acquisition time caused by intermittent transmissions, and also minimizes an increase in interference due to unnecessary transmission of a reverse pilot/PCQ channel and an increase in interference due to unnecessary transmission of a reverse power control bit over a forward link.
For example, in a synchronous CDMA-2000 system to which the present invention is applied, a frame length is 20ms and each frame includes 16 power control groups. Thus, each power control group is 1. 25ms and a frame length for a dedicated control channel is 5ms. It should he noted that the present invention can also be applied to a case where there is no user data to trarsmit in a UMTS system, which is a asynchronous IMT-2000 system. In the UMTS system, it is possible to transmit not only a power control bit for a dedicated physical common control channel (DPCCCH) for transmitting the control signal but also a pilot signal and a transport format combination indicator (TFCI).
Although the present invention will He described with reference to an embodiment
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which intermittently transmits a control signal in a control hold state in a CDMA mobile cornmunicBiion system, the present invention can also be applied to a case where information is intermittently transmitted to prevent ah increase in interference to radio links which may be caused by unnecessary transmission of a control signal and thus, to reduce power consumption
A reference will now be made to a base station transmitter and a mobile station transmitter, which intermittently transmit control signals in a control hold state according to an embodiment of the present invention. FIG. 2A illustrates n base station transmitter according to an embodiment of the present invention. For simplicity, FIG. 2A does not illustrate channel coding ond interleaving stages of respective channel transmitters for F-CCCH, F^DCCH and F-DTCH.
Referring to FIG 2A, the pilot channel, F-CCCH and F-DTCH have the same structure as those of FIO. I A. A gated transmission (or intermittent transmission) controller 1V0 generates a gating (or intermitting) control signal for gating (or intermitting) transmission of a dedicated control channel in a control hold state. The gated transmission controller 190 having a gating rate (i.e., duty cycle) and a gating pattern for gaied transmission in the control hold state, generate* a control signal for intermittently transmitting a transmission signal on the dedicated control channel at a time previously scheduled with a mobile station. Here, the dedicated control channel includes an F-DCCH andasharableF-DCCH.
A demultiplexer I Yl demultiplexes a channel-coded interleaved con iroi signal on the
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F-DCCH channel to 1 and Q channels. Here, a serial-to-parallel converter can be used for the demultiplexer 122. It is assumed herein that the demultiplexer 122 has a signal mapping function or receives a signal-mapped signal. Mixers 132 and 133 multiply signals output from the demultiplexer 122 by an orthogonal code W*y for the F-DCCH to orthogonally spread the signals. The mixers 132 and 133 serve as orthogonal modulators. The spread signals output from the mixers 132 and 133 are gain controlled by amplifiers 142 and 143, respectively. Switches 192 and 193 connected between output nodes of the amplifiers 142 and 143 and input nodes of summers 150 and 152, is switched in response to the gating control signal output from the gated transmission controller 190. Therefore, switches 192 and 193 intermittently transmit transmission signals on the dedicated control channel in response to the gating control signal output from the gated transmission controller 190. Instead of using the switches 192 and 193. it is also possible to control gains of the amplifiers 142 and 143 to obtain the result of gated transmission. That is, by setting a gain control signal applied to the amplifiers 142 and 143 to zero, it is possible to discontinue transmission of the dedicated control channel.
The shamble F-DCCH has the same structure as that of the F-DCCH. The other structure of the dedicated control channel transmitter is the same as that shown in FIG. I A.
The base station transmitter of FIG. 2A gates the outputs of amplifiers 142,143,144 and I4S for the forward dedicated control channel F-DCCH#y and the sharable forward dedicated control channel F-DCCH#z usingthe gated transmission controller 190 and gates (or switches) 192. 193. 194 and 195. That is, the gated transmission controller 190 allows a reverse power control bit to be transmitted at a power control group (i.e.. time slot
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schedule) with the mobile station whoa the forward and reverse dedicated control channels arc not activated in the control hold state where there is no user data to exchange. When the reverse dedicated control channel is not activated (at a non-signaling transmission duration) in the control bold state, only a reverse power control hit within a forward power control group is transmitted, which is selected according to a gating pattern for the reverse pilot/PCB channel. The forward and reverse gating patterns arc the same, but there exists an offset therebetween for effective jpower control The offtel can be given as a system parameter.
FIG. 2B illustrates a mobile station transmitter according to an embodiment of the present invention. For simplicity, FIG. 2 does not illustrate channel coding and interleaving stages ot respective channel transmitters for R-SCH, R-DCCH and R-fCH Therefore, the respective channel transmitters receive channel-coded interleaved signals.
A gated transmission controller 290 generates a gating control signal for gating transmission of a reverse pilot/PCB channel in a control hold state. The gated transmission controller 290 having a gating rate and a gating pattern for performing gated transmission in the control hold state, generates a control signal for intermittently transmitting a transmission signal on the reverse pi tot/PC B channel at a time scheduled with the base station.
A multiplexer 210 multiplexes a signal $a a reverse pilot channel and a power control bit for controlling power of a forward link. A mixer 230 multiplies the signal on the reverse piiot/PCB channel by an orchogonai code assigned to the pilot/PCB channel to generate an
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orthogonally spread signal. A switch 232 connected between an output node of the mixer (230 and an input node of a summer 224. is switched in response to the gating control signal output from the gated transmission controller 290. Therefore, the switch 232 is switched according to the gating control signal from the gated transmission controller 290 to intermittently transmit a transmission signal on the pilot/PCB channel. Instead of using the switch 232, it is also possible to provide an amplifier at an output state of the reverse pilot/PCB channel and control a gain of the amplifier to obtain the result of gated transmission. That is, by setting a gain control signal applied to the amplifier to zero, it is possible to discontinue transmission of the reverse pilot/PCB channel.
The other channel transmitters have the same structure as that of FIG IB.
The mobiU itaiion transmitter oi'FIG. 2B includes the gated transmission controller 290 which cot itruis the "-wiicl" 232 tor lilting transmission of the reverse pilot/PCB channel. Since transmission of the reverse pils;/PC3 channel is necessary for sync detection, it is not possible to transmit other reverse channels at a location which precludes (i.e., d ^continues) the transmission of the pilot TCP ". Srn.it:
Reference will no* be made so >lruUures of si^imb- thai the base station transmitters and the mobile station transmitters of FIGs. 2A and 2B intermittently transmit in the control hold state Herein, n description will be rrade with reference to as reverse pilci/FCB channel, for convrnirncr of t.*.p!ar.ttic*.
KICi i i" p Hi"(rrnip_ describing how a mobile sia:or. ir.te."^i:ucnt!> ininsmits a signal
- 23 -

on a reverse pilot/PCB channel in a control hold state in a CDMA communication system according to as embodiment of the present invention- FIG. 3 shows various methods for intermittently transmitting the signal on the reverse pilot/PCB channel according to a gating control signal from the gated transmission controller 290, wherein the gating control signal defines regular gated transmission.
In FKi 3, reference numeral 300 shows a method for continuously transmitting a signal on the reverse pilot/PCB channel with a gating rale t (i.e., duty cyclc=l/l), when a reverse dedicated control channel (R-DCCK) is not activated in the control hold state. Shown is a case where a mobile station continuously transmits the reverse pilot/PCB channel in the control hold slate, to avoid rwync acquisition at a base station In this case, an increase in interference of the reverse link inevitably decreases a capacity of the reverse link.
Reference numeral 320 shows n method for intermittently transmitting the signal on the reverse pilot/PCB channel every other power control group at regular intervals when DC-1/2 in the control hold state, wherein the signal is transmitted only for i/2 of the total power control groups within one frame. Reference numeral 322 shows a method for intermittently transmitting the signal on the reverse pilot/PCB channel every four power control groups at regular intervals when DC =1/4 in the control hold state, wherein the signal is transmitted only for 1/4 of the total power control groups within one frame. Reference numeral 324 shows a method for intermittently transmitting the signal on "he reverse pilot/PCB channel every eight power control groups at regular intervals when IX'=I/R in the c rt,Y>I rolr iw.e, *">erein the signal is transmitted orlj fin .78 effte total newer -.-nro! groups wirhin nrc frime.
- 24 -

Reference numerals 340,342 and 344 show methods for intermittently transmitting the signal on the reverse pilot/PCB channel according to an irregular gating pattern in the control hold state.
More specifically, reference numeral 340 shows a method for intermittently transmitting the signal on the reverse pilot/PCB channel every rwo power control groups at irregular intervals when DC-1/2 in the control hold state, wherein the signal is transmitted only for 1/2 of the total power control groups within one tome. Reference numeral 342 shows a method for intermittently transmitting the signal on the reverse pilot/PCB channel every four power control groups at irregular intervals when DC =1/4 in the control hold state, wherein che signal is transmitted only for 1 /4 of the total power control groups within one frame*. Reference numeral 344 shows a method for intermittently transmitting the signal ;>n tl"t i-ewrse jntOi/FC3 channel every eight power control groups at irregular intervals 'oVi ZK - i V :rt tl:e c.-Mrol LolJ state, wntrein the signal is transmitted only for 1/8 of the total power control groups within on
Reference numerals 360. 362 ar"u Z(A show methods for iiucrrniatntly transmitting the sig.-iH en ihe reverse pilot/W.B crmrihti according to n :n:j-iiinr gating paiicm in the control hold state.
More specifically, reference numeral 360 shows a method for intermittently rr?.r.;*T'ttinfe the signal on the reverse pilot/?*CB channel at four consecutive power control b'Vjns a; 'X^jbr i/:U state, wherein the signal is irarrrr.ittsd ^^ly fr* \/2 of the total power co.itiol $-viirt? vvithin one frame. Reference
- 25 -

numeral 362 shows a method for intermittently transmitting the signal on the reverse pilofPCB channel at two consecutive power control groups at regular intervals when DC=l/4 in the control hold state, wherein the signal is transmitted only for 1/4 of the total power control group* within one fhune. Reference numeral 364 shows a method for intermittently transmitting die lignal on the reverse pi lot/PC B channel at a single power control group at regular intervals when DC -1/8 in ihe control hold state, wherein the signal is transmitted only for 1/8 of die total power control groups wilhin one frame. It is noted that each time the gating rate decreases by 1 /2, 1 /4 and I /8, the number of the consecutive power control groups is halved.
Refercr.es numerals 28O, 382 and 334 show methods for inte"ntittcnt!y transmitting the signal on the reverse pilot/PCB channel according to a regular gating pattern in the control hold state according to another cmi"c More specifical1,'. reference numeral 380 shoe's a tnethjd for consecutively transmitting half of the total power control groups within one frame at the latter half of the frame when 1X> 1/2 in a control hojd Mate, wherein the signal is transmitted only for 1 /2 of ihe total power controi p-oups within one frame. Reference numeral 382 show* a method for consecutively transmitting 1/4 of the total powea coctto' gouyi within one frame begining at a 3/4 position oftfcc frame when DO=".'4 in thrcontrol ftoid °Wt, wherein the signal is transmitted only for 1/4 of the toiai power control jroups within one frame Reference numeral 384 shows a method for consecutive i"in"mitt'nf" I /8 or the total power control groups within one frtme beginning st o. 7/8 position ol iiw iia - 26 -

control groups within one frame It is noted that for each decrease in the gating rate (i.e.. 1/2, 1 /4 and 1/8), the number of the consecutive power control groups is halved.
Gated transmission of the reverse pilot/PCB channel shown in F1G. 3 is performed by the gated transmission controller 290, and the gating rate and the gating pattern should be previously scheduled with the gated transmission controller 190 in the base station. FIG 3 shows a case where one frame is comprised of 16 power control groups or slots. In this case, the gated transmission controller 290 can perform gated transmission at four different paling rate of DC-1/1,1/2,1/4 and 1/8. Further, the gated transmission controller 290 can perform gated transmission according; to the regular or irregular gating pattern. It is noted that the signal transmission methods 32J, 340,360 and 380 each having the gating rate 1/2 show various regular and irregular gating patterns.
FIO 4-4 Ui4J. a.silisgrtrv .cor*J"plaininghowam3bii";st":c"tiirprr.rfjirs;(message on a reverse dedicated control channel (R-OCCHK which is generated while performing gated! transmission according to the gating raics end g&:ir*g patterns shown in FIG. 3.
Referring to FIG. 4A, reference numerals 400a. 420a, 422a and 424a represent positions vhert an R.-DCCH can be transmitted when a mobile station performs gated transmission in the control hold state using the gating rates and gating patterns for the signal transmission methods 300, 320, 322 an* 3?.4 of FICJ. i. I hat is, when u dedicated MAC channel (dmch), being a logical channel, is generated while performing gated transmission AS represented by reference numerals 300,320,322 and 324. the mobile station transmits the dmch to the R-DCCII, being a physical channel, at specific locations of the reverse
- 27 -

pilot/PCB channels 400a, 420a, 422a and 424a.
More specifically, first, reference numeral 400a shows a method for transmitting a message on the R-DCCH in the case where a dmch message is generated during non-gated transmission (i.e., during DC-1 gated transmission). During non-gated transmission, the R-DCCH is activated within at least one power control group as represented by reference numeral 412a to transmit the dmch message. Therefore, the R-DCCH message can be transmitted at all of the 16 power control groups. Second, reference numeral 420a shows a method for transmitting the R-DCCH message in the case where a dmch message is generated during DC = 1/2 gated transmission. In mis case, the R-DCCH is activated within ul least one power control group as represented by reference numeral 414a to transmit the dmch message. Third, reference numeral 422a (hows a method for transmitting the R-DCCH message in the case where * dmch message is generated during DC=1/4 gated transmission. In this case, the R-DCCII is activated within at least four power control groups as represented by reference numeral 4116a to transmit the dmch message. Third, reference numeral 422a shows a method for transmitting the R-DCCH message in the case where a dmch message is generated during DC*W8 gated transmission. In this case, the R-DCCH is activated within at least seven power control groups as represented by reference numeral 418a to transmit the dmch message.
In the embodiment of FIG. 4A, when a dmch message is generated during gated transmission, the power control groups are activated at the corresponding duration, even though the dmch message was generated at a location where the power control groups are not to be transmitted. That is. as shown by 400a, 420a, 422a and 424a, even the power
- 28 -

control groups which arc not to be transmitted during gated transmission are activated, to transmit the R-DCCH at the corresponding power control group duration. When it is required to transmit the R-DCCH during gated transmission, the R-DCCH is transmitted after one power control group is transmitted as a preamble signal uti lizing the power control groups 414a, 416a and 418a scheduled to be transmitted according to the gating pattern, so tu to enable the base station to accurately receive the R-DCCH. In addition, the R-DCCH is transmitted with transmission power which is higher by AP than transmission power for continuous transmission, which can be given as a system parameter.
Referring to FIG. 4B. reference numerals 410b, 490b, 492b and 494b represent positions where an R-DCCH can be transmitted, in the case where a dedicated MAC channel {dmch). being a logical channel, is generated in the control hold state for the signal transmission methods 300, 320, 322 and 324 of FTG. 3 and transmitted to the R-DCCH,
being a physical channel
First, when the dmch message is generated at a non-gated transmission duration (DC™ 1) as shown by reference numeral 410b, the R-DCCH is activated within at least one power control group as shown by reference numeral 41 lib to transmit the dmch message. Therefore, the R-DCCH message can be transmitted at all of the l*> power control groups. Second, when a dmch message is generated at a location where gated transmission is performed at DC" 1 fl as shown by reference numeral 490b, the R-DCCH is activated within at least three power control groups as shown by reference numeral 413b to transmit the dmch message. Third, when a dmch message is generated at a location where gated transmission is performed at DC=l/4 as shown by reference numeral! 492b, the R-DCCH is activated
- 29 -

within at least four power control groups as shown by reference numeral 415b to transmit the droch message. Fourth, when a dmch message is generated at a location where gated transmission is performed at DC= I /8 as shown by reference numeral 494b, the R-DCCH is activated within at least seven power control groups as shown by reference numeral 417b to transmit the dmch message.
In the embodiment illustrated in FIG. 4B, even the power control groups which are not to be tui(.vriitteu during gated transmission are activated, to enable transmission of the R-DCCM Mt the corresponding power controi groupduration. When it is required u> transmit the R-DCCH during gated transmission, the R-DCCH is tnuurr.itt zd fifter one power control group is transmitted as a preamble signal utilizing the power control groups 413b, 415b and 41 ?h, so as'tc enable the base station ?o accurately receive the R-DCCH. In addition, the R-OCCH is transmitted with transmission power which is. higher by AH th?n transmission power for continuous transmission. The higher transmission power can be provided as a system parameter.
Referring to FIG. 4C. reference numerals 400c, 440c, 442c and 444c represent positions where an R-DCCH can be transmitted, in the case where a dedicated MAC channel (dmch). being a logical channel, is generated in the control hold state for the signal transmission methods 300, 340, 342 and 344 and transmitted to the R-DCCH, being a physical channel.
First, when th as *>,a*u by reference numsraf 4C0c, the R-DCCH is activated within at least one
- 30 -

power control group as shown by reference numeral 412c to transmit the dmch message. Therefore, the R-DCCH message can be transmitted at all of the 16 power control groups. Second, when a dmch message is generated at a location where gated transmission is performed at DC= I /2 as shown by reference numeral 440c, the R-DCCH is activated within at least three power control groups as shown by reference numeral 434c to transmit the dmch message. Third, when a dmch message is generated at a location where gated transmission is performed at DC-l/4 as shown by reference numeral 442c, the R-DCCH is activated within at least two power control groups as shown hy reference numeral 436c to transmit the dmch message. Fourth, when a dmch message is generated at a location where gated transmission is performed at DC"I/S as shown by reference numeral 444c, the R-DCCH is uctivaied within at least four power control groups as shown by reference numeral 438c to transmit the dmch message.
In the cmhodiment of fiG. 4C, as shown by 440c. 442c and 444c, even the power control groups wtucn are not u> be uansmitied during gated transmission are activated, to iransnut the R-DCCH at ihc correspijrtdtr.g power control group duration. When it is required to t;anr.rmi ihe ft-OCCH during guuc tr&r.smi&Kion, the R DCCH ." transmitted ailer ore powercciiL-oi ^roup it trariiimilU'd ts a preamble Ji^rul uttlmr.g die pcAr:r control gr. 434c. 436c we" 4lRc scheduled to be trar.ST ;"ed acceding to the fearing p&rtern, so w to enable the bnse station to accurately receive the R-DCCH. !n addition, the R-DCCH o" irsnsrr.ittcd with tr.m"mi""ton oower which i? higher by AP th?ii transmission power for continuous transmission, which cun b": given is a system parameter.
Referring to FIG. 4D, reference numerals 400d, 460d, 462d and 464d represent

positions where an R-DCCH can be transmitted, in the ca.se where a dedicated MAC channel dmch, being a logical channel, is generated in the control hold state for the signal transmission methods 300, 360, 362 and 364 and transmitted to the R-DCCH, being a physical channel.
First, when the dmch message is generated at ID non-gated transmission duration (CX> 1) as shown by reference numeral 400d, the R-DCCH is activated within at least one power control group as shown by reference numeral 4l2d to transmit the dmch message. Therefore, the R-DCCH can be transmitted at all of the 16 power cuntroi groups. Second, when a dmch message is generated at a location where gated transmission is performed at IK*-10. as shown by reference numeral 460d. the R-DCCH is activated within at least four power control group* as shown by reference numeral 464d to transmit the dmch message. Third, when a dmch message is generated "t a location where gated transmission is performed at DC-1/4 as shown by reference numeral 462d, the R-DCCH is activated within at least.seven power control groups as shown by reference numeral 456d to transmit the dmch message. Fuurin, *hcn a dmch mt&agc is generated at a location where gated transmission is performed at DC" 1/8 as shown by reference r.umcru] 464d, ihc R-DCCH is atavaied *iinir, a; iet&t sever power ccntro! group* ai shov.n by refwensc numeral 458d to transmit the d*ndt message.
!n the embodiment of FIG. 4D, as shown by 46Od, 462d and 464d, even the power control groups vhich are not to be transmitted during ¦ 3? -

after one power control group is transmitted as a preamble signal utilizing the power control groups 454d, 4S6d and 458d scheduled to be transmitted according to the gating pattern, so as to enable the base station to accurately receive the R-DCCH. In addition, the R-DCCH is transmitted with transmission power which is higher by aP than transmission power for continuous transmission, which can be given as a system parameter.
Referring to FIG. 4E, reference numerals 400c, 480e, 482e and 484e represent position-; where on R-DCCH can be transmitted, in the case where a dedicated MAC channel (dmch), being a logical channel, is generated in the control hold state for the signal transmission methods 300. 380, 382 and 384 and transmitted in the R-DCCH. being H physical channel.
First, when the dmch message is generated at a non-gated transmission duration (OC-I) as shown by reference numeral 400c. the R-DCCH is activated within at least one power control group as shown by reference numeral 4lie to transmit the dmch message. 'Therefore, ihe R-DCCH can be irin&vnitted di all of the 16 power control groups. Second, ovhir e dmch n*suage is ^eneie'.cd &: " kcaiiun whete gate*! injwnission .s performed at DO* '1 as >|to*vn by Mert?Kv numeral 430c, the R-DCCK i* nc;ivattu! within nt least eight power control groups as shown by reference numeral 474e to transmit ttrc cinch message. Third, when a dmch mes?sge is generated nt a Joctfion wf>ere gated transmission is performed at DC= 1/4 as shown by reference numeral 4S2e. tfce R-OCCH is acrivjscd within at leest thirteen power contml f rour" as shown bv reference rtumcra! 476c to transmit the dmch message. Fourth, when a dmch message is generated at a location where gated transmission is performed at EX>!/8 as shown by reference numeral 484e, the R-DCCH is
3 3-

activated within at least fourteen power control groups as shown by reference numeral 478c to transmit the drnch message.
In the embodiment of FIG. 4E, as shown by 480c, 482e and 484e, even the power control groups which are not to be transmitted during gated transmission are activated, to transmit the R-DCCH at the corresponding power control group duration. When it is required to transmit the R-DCCH during gated transmission, the R-DCCH is transmitted after one power control group is transniiitted as a preamble signal utilizing the power control groups 474c, 476c and 478c scheduled to be transmitted according to the gating pattern, so as to enable the base station to accurately receive the R-DCCH. In addition, the R-DCCH is transmitted with transmission power which is higher by AP than transmission power for continuous transmission, which can be given as a system parameter
Referring to FIG. 4P nsfcrpre numcrsls 400f, *?1f, 423f and 42*f represent positions where an R-DCCH can be transmitted, in the case where a dedicated MAC channel dmch. being a logical channel, is generated in the control hold state for the signal transmission methods 300. J20, 322 and J24 and transmitted to the R-DCCH, being a
First, when the dmch message is generated at a non-gated transmission duration - 34 -

DC-1 a as shown by reference numeral 421 £ the R-DCCH is activated within at leasi two power control groups as shown by reference numeral 414f to transmit the dmch message Further, as shown by reference numeral 415£ a reverse pilot/PCB channel is transmitted at a power control group (hereinafter, referred to as an additional transmission power control group) following the power control groups where the R-DCCH has been transmitted, to ensure accurate channel estimation at a base station. Third, when a dmch message is generated at a location where gated transmission is performed at DC-l/4 as shown by reference numeral 4231. (he R-DCCH is activated within at least four power control groups ts shcwi; by reference numeral 4l6f to transmit the dmch message. Further, as shown by reference numeral 416f; a reverse pilot/PCB timnnel In the einbodiine.it t,( f|G. 4F, as shown by 42it, 423t and 425f, even the power control groups which are not to be transmitted during gauxl iransmissioii are aclivated, to transmit the R-DCCH al the corresponding power control group duration. When it is required to transmit the R-DCCH during gated tmrsmissior* >ht ^-DCCH is uansmitted after one power control group is transmitted utilizing ?he power c-ortro! groups *14f, 4l6f
- 35 -

and 418f scheduled to be transmitted as a preamble signal according to the gating pattern, so as to enable the base station to accurate ly'recei ve the R-DCCH. In addition, the R-DCCH is transmitted with transmission power which is higher by AP than transmission power for continuous transmission, which can be given as a system parameter.
Referring to FIG 4G, reference numerals 400g, 427g, 428g and 429g represent positions where an R-DCCH can be transmitted, in the case where a dedicated MACchanncI dmch, being a logical channel, is generated in the control hold state for the signal (runsmisston methods 300. 320. 322 and 324 and transmitted to the R-DCCH, being a pliy&itai channel.
rlr>t. when tiit dmen message -s geitTiii the tiinch message. Further,
- 36 -

as shown by reference numeral 407g, 8 reverse ptlot/PCB channel " transmitted at the remaining power control groups following the power control groups where the R-DCCH has been transmitted, to ensure accurate channel estimation at the base station. Fourth, when a dmch message is generated at a location where gated transmission is performed at DO1/8 as shown by reference numeral 429g. the R-DCCH is activated within at least seven power control groups as shown by reference numeral 418g u> transmit the dmch message. Further, as shown by reference numeral 409&, a reverse pilct/PCB channel 'S transmitted at the remaining power control groups foil owing the power control groups where the R-DCCH has been .transmitted, to ensure accurate channel estimation at the base station
In the embodiment of FIG. 4G, as shown by 427g, 428g and 429g, even the power control groups which are not to be transmitted during gated transmission arc activated, to transmit the R-DCCH at Ihe corresponding power control group duration. When it is icqiatcJ to trausrr.it the R-DCCH during gated traiismmion, the R-DCCK is transmitted an>r ore powc control &/flup is Uunsr.ltttd utiufrng tbc power contioi groups 4Kg, 416g and 418* schauled to W iivmmitted as a preamble signal acccrding lo ±c ga;u;g pattern, so w to enab'e the bsr-e station tr. nccitriUcly rcr.eiv" t.V P.-DCCH. 1^. ^Jdltion, the R-DCCH is transmitted with transmission power which is higher by #P than rransmission power for continuous transmission, which can be given as a system, parameter.
With reference to FIG. 2B, a description will now be made regarding gated transmission of FIGs. 4A to 4G. The gated transmission controller 290 has the gating patterns shown in FIGs. 4A to 4G, and the switch 232 is switched according to Ihe gating patterns output from the gated transmission controller 2V0. The multiplexer 210 multiplexes
- 37 -

a pilot signal and a PCB on a power control group unit basis, and the mixer 230 multiplies a signal output from the multiplexer 210 by an orthogonal code assigned to (he reverse pilot/PCB channel lo generate an orthogonally spread signal. As a result, the pilot/PCB channel signals are multiplexed according to the gating patterns and the gating rates of FIG. 3, under the control of the switch 232.
When u timui message is generated at a location where Ihe reverse pilot/PCB channel signal is intermittently output, an X-IXX'H tor transmitting the dmch is activated. The dmch mtssttgc h ihtn applied iv !hs R-OCCK to he signal converted after channel coding and interleaving The mi>sr 240 lien ir.uLlpties the dmch mc-Sadge by urt orthogonal code assigned ta the R -DOCH i* orthogonal!} tyrtad ihr dmsh message. AL i.i.s p*5"nu when it is nrc^ssaiy to tmnsrri*. a messftge or. a dedicated c vitu! vhunnel through UK R-DCCH during gated transmission, a urdfpicted controller concruls the nmpUficr ?4? to Increase its transmission power by *P as compared with the trpnsrnisfior power for contini;ous transmission of the R-DCCH.
If the R-DCCH message is generated during gated transmission, the gated transmission controller 290 controls the signal on the reverse pilot/PCB channel in any one of the methods shown in FIGs. 4A to 4G.
The methods ot> IGS. 4F and 4C for transmitting the additional power control groups can be applied not umy to tne regular gated transmission of FIG. 4A but also to the other gated transmission* uf FIG. 4B to 40
- 38 -

A reverse dedicated control channel shown in FIGs. 4H to 4K and FIGs. 6£ to 6H can be iransmincd at four places of 0, S, 10 and 15ms within a 20ms basic frame in a unit of a 5ms reverse dedicated control channel frame, as in the conventional method.
Referring to FIG. 4H. reference numerals 400b. 420h, 422h and 424h represent location* where an R-DCCH can be transmitted, in the case where a dedicated MAC channel dmc.i, being a logicbi channel, is generated in the control hold state for the signal transiiis-ior: mcihous 300. 3'0. 322 ar.d il'4 and tunsmittec lo the K-iX-CH. being a r.hyr.csl c^arwl.
More specifically. reference numeral 400h shows a case where an R-DCCH ii activated within at least 5ms which corresponds to one R-DCCH frame length "o transmit a dmch message After generation of the dmch message during non-gated transmission (DC-1 >, as shown by reference numeral 412h. Reference numeral 420h shows a case where an R-DCCH is activated within at least 5ms to transmit a dmch message after generation of the dmch message during DC" I i'Z gated transmission, as shown by reference numeral 414h. Rcicrcnce numeral 422h shows a case where an R-DCCH is activated within at least 5ms in Odnsmii a omch n.essa^c &fter gencraucn of tiie linich message curing DC-i/4 gated U'&nMiii'^ior. a.-; shown l"> refrrt?!Ct: numeral ? 'S gated tran&mir-sion. a. r;hown by reference numeral 418h.
In the embodiment of FIG. 4H. as shown by 420h. 422h and 424h. even the power
- 39-

control groups which are not to be transmitted during gated transmission are activated, to transmit the R-DCCH at the corresponding power control group duration. Further, tor each activated power control group, it is possible to remove a PCB duration to extend a pilot signal duration over the entire power control group. When ii is required to transmit the R-DCCH during gated transmission, a preamble signal and a poslamble signal are transmitted before and after the R-DCCH by activating the pilot/PCB channel. At the preamble and posinmbitf duration*, it is possible to remove the forward PCB to extend the pilot signal duration over 3,c puwct control givup. Titc numbci, F In all the embodiments, the description is made with reference tc a case wherein F-1 t"d for transmission of preamble signals. Reference numeral 424h shows a case where a power control group 425h is activated to transmit a preamble signal, since there is no scheduled power control group. Further, for all the cases 420h, 422h and 424h, there is no scheduled power control group at the postamble signal duration, so that power control groups 4l5h, 417h and 4l9h are activated for transmission of the poscamble signals. The R-DCCH is transmitted with transmission power higher by AP than transmission power for continuous transmission (DC-1/1), which can be given as a system parameter. Although channel estimation is performed using tne added preamble and postamble signals, a search procedure for synchronization in u\e contra; hoitisialc is perform sdusinga power con iroi group scheduled
- 40 -

to be activated.
Referring to FIG. 4!, reference numerals 400i, 4401442i and 444i represent locations where an R-DCCH can be transmitted, in the case where a dedicated MAC channel dmch, being a logical channel, is generated in the control hold state for the signal transmission methods 300. 340, 342 and 344 and transmitted to the R-DCCH, being a physical channel
More spociltCdii), reference numeral 40t)t shows a case where an R-IXXH is f c"iv"t"d w'..li.i\ ai l--*st 5ms whicii Cvntiponds ;o une R-DCCH rrnmc length to transmit a drr.fit message after joncit'iJn cT .he dmch uier,suge Curing nur.-g&t^o transmission (DC-l). an shown by reference numm1412: Rrfercn:e numeral 440i shows u c*&" where an R-DCCH is activated within ai least 5mn io transmit a dmch mr.tsage a^"r ger.cration of the dmch message during DC-1'2 gated transmission, as shown by rcfrrence numeral 434i. Reference numeral 4421 shows a case where on R-DCCH is activated within at least 5ms ro transmit a dmch message after generation of the dmch message during DC-1/4 gated transmission, as shown by reference numeral 436i. Reference numeral 444i shows a case where an R-DCCH is activated within at least 5ms to transmit a dmch message after generation of the dmch message during: DC-1/8 gated transmission, as shown by reference uunicral 4J8i.
In the embodiment of TIG 41 a:; 5)10**1! b\ 440i, 442! and 444i, even the power control groups which are not :o be transmitted during gaied trfir-smiisioji are activated, to transmit the P-DOCH at The 'jorrespordin?po'.vtrcnnrrcl group deration. r:irthcr, Tor each activated power control group, it is possible to remove a PCB duration to extend a pilot
-41-

signal duration over the entire power control group. When it is required to transmit the R-DCCH during gated transmission, a preamble signal and a post amble signal are transmitted before and after the R-DCCH by activating the pilot/PCB channel. At the preamble and postamblc durations, it is possible to remove the forward PCB to extend the pilot signal duration over the power control group. The number, F (*0), of the preamble signals and the number, 3(>C). of the oostamble signet; are given as system panmctcrs.
In all the embodiments, the description is made with reference to a case wherein P= 1 and B"l. When a power control group scheduled to be transmitted according to the gating pattern is included in the preamble and postamblc signal durations, it is not possible to (remove the forward PCB. In the case 440i, schedule power control groups 441 i and 435i are used for transmission of preamble and postambte, respectively. In the case 442 i, a scheduled power control group 437i is used for transmission of a postamble signal and a scheduled power control group 443 i is used for transmission of a preamble signal. In the case 444i, since there are no scheduled power control groups for transmission of preamble and fKMtamblc signals, power control groups 445i and 439i are activated Tor transmission of piedinble atij pc$tatnble signals. Ths R-DCCH \i trail am me J *ith transmission power higher by "J* than transmission power for conziauous transmission (DC*-1/*). which can be given a1 A system p&rturcter. Although .ha-j>el estimation h pciformcd using the added preamble and pGSianMc ?ignah, c r.csrch pracrdiire for synchnwization in rh" ^imirol hold slate h performed usin? a power corjtrtjl protip scheduled to be activated.
Referring to FIG 4.1, reference numerals 400j. 46j. 462j and 464i represent locations where an R-DCCH can be transmitted, in the case where a dedicated MAC channel dmch,
- 42 -

being a logical channel, is generated in the control hold state for the signal transmission methods 300,360,362 and 364 and transmitted to the R-OCCH, being a physical channel
More s-pecifkally. reference numeral 400j shows a ca*s where an R-DCCH is activate v/rthin at lt*st 5ms which coiTCTpcndr. TO err R-DCCII frame ter.gth to transmit a dmch message after generation of the dmch message during non-gated transmission l'4 gated transmission, f-s shown by reference uumciat 456j. Reltvcnce numeral 4o4, shows a case where an R-DCCI! i; activated wit** in at lead 5ms to tia;;smit ft dmtJp message after generation of the dmch message during DC*I /$ gated transmission, as shown by rcfrrence numeral 458j
In the embodiment of FIG. 4J, as shown by 460j, 462j and 464j, even the power control groups which are not to be transmitted during gated transmission are activated, to transmit the R-DCCH at tbe corresponding power control group duration. Further, for each activated power control group* it is possible la remove a 1VU duration to extend a pilot H^nai dursiion over the t.'ilirc jK^vw CORCIM! group. V/Vn i; is riQuired to '^arismit (he R-DCCH during cHted transmission, z preamble signal anH % pmtvnMc signal are transmitted before and afler the R-DCCH by ectivating the pi|o*/PCB chunnel At tbe preamble and postamhlc durations, it is possible to remove the forward PCB to extend the pilot signal
- 43 -

duration over the power control group. The number, F (zQ), of the preamble signals and the number, BO0); of the postamble signals are given as system parameters
In all the embodiments, the description is made with reference to a case wherein F= I and B= 1 When a power control group scheduled to be transmitted according to the gating pattern is included if. me preamble and posiamble signal durations, it is not possible to ixnuivc *hc* forwaid PCS. In t.ie case 4(KJj, scheduiid power control groups arc used for *.nir.s:r.i:tfUM of pi'J'urbie und poiumc!e Mgn-li. In Uie CUJC 460j, since ihtiv are no scheduled powcT coi tn"l groups for tr^nvni%s!oo of pi tw ibl- a.id |ieitambte iignali, power control £.rn::rs 461} and 455) ire activated for trarsmir^ior. of the prcan&'e tnd mistamble signals, respec'jvely I n the ewe 46?j, since their an- no scheduled power control groups for transmission of preamble and postamble signals, power control groups 463j and 457j are activated for transmission of the preamble and postamble signals, respectively. In the case 4fi4j. since there ore no scheduled power control groups for transmission of preamble and postamble signals, power control groups 465 j and 459j are activated for transmission of the preamble and postamble signals, respectively. The R-DCCH is transmitted with transmission power higher by &P than transmission power for continuous transmission (DC=1/I), which can be given as a system parameter. Although channel estimation is performed using the added preamble and postamble signals." search procedure for synchronization in the control no id state is per formed using a power control group scheduled to be activated
Referring to FIG. 4K, reference numerals - 44 -

transmission methods 300. 380. 382 and 384 and transmitted to the R-DCCH, being a physical channel.
More specifically, reference numeral 400k shows a case where an R-DCCH is activated within at least 5ms which corresponds to one R-DCCH frame length to transmit a dmch message alter generation of the dmch message during non-gated transmission (DC-1). ns shown by reference nuinerai 412k. Reference numeral 480k shows a case where . shnwt a ewe where an R-DCCH is aciivafwl wJtVin at li-ast 5ms to transmit a dmch treftsflpr. aft* genemtion of the 4mcb ri"sa"e during DC=1/4 gated transmission, as shown by reference numeral 476k. Reference numeral 484k shows a case where an R-DCCH is activated within M least 5ms to transmit a dmch message after generation of the dmch message during DC-1/8 gated transmission, as shown by reference numeral 478k.
in ine embodiment of FlG. 4K, tu shown by 480k, 41Uk and 4&4k, even the power umiToi groups w.iich a*e not to be tTans.iiitlcd during ^ated tianimission ait activated, to transmit thtk-DCCH ji L-.c corrtipondiiife power control grouf duration. FuitLer, lor etch Tirtivtttcd po\""- iip, it '"o |>t-s-*iMe to t^eniirt'C a FCB - 43-.

duration over the power control group. The number, F (*0), of the preamble signals and the number, B(sO), of tb" postamble signals are given as system parameters.
In till the embodiments, the description is made with reference to a case wherein F-1 and B=1, When a power control group scheduled to be transmitted according to the gating r&ftc.ii i* .ne'uded in Hit pieinil/lc and postamble signal durations, it is not possible to remove the forward PCB. In the case 43Gtc, a sthedJled power control giuup 475k is used fnr transmission cf a postrmhlc signal, tni a pov*rr CCT^VOI group 48 j is iucvawd for transmission of a preamble signal. \n the case 482k. since there IT? (to sth'Juted power control groups for transmission of preamble and postemble signals, power co-ucl groups 483k and 477k are activated for trarvimission of the preamble and nestable signal, respectively. In the ca" 484k, since there are no scheduled power control groups for transmission of preamble and postamble signals, power control groups 485k and 479k are uctivared for transmission of the preamble and postamble signals, respectively. The R-DCCH i> transmitted with wansmission power higher by aP than Iransmission power for coniiitbdtte irrmsmission (DC^i/i I, which can be given as a system parameter. Although itharuul tiiti.iiaiior. is perfotmed using U,e addec preamble tr"d pcatambie sigruls, a search r.:*xtrduie f r iyiict.roni.aiion in ;he cxmrcl hold &i*ic is petfermed using a pow-ct control osroup sc^ftduie Prior to describing FlOs. 5A to 6H, a reference will be made to the tb'Iowtrtg power control methods
Norms1 P°*"r ^QlUl^ot

A base station (or mobile station) commands a mobile station (or base station) to increase tra.ismi&ioii power when * ii^iiai-io-interference ratio {SIR) is lower than a o-hnenho'd anc" the mo'.iie -XA'-c-a(" la.** sia'.!o")ther. iiv.rtaie* transmissionpev.-cr hereof according to the command. Further, the base station (o^ mobi'e station) ojrairands1 the mobile station (or base station) to decrease transmission power when the SIR is higher than the threshold, and the mobile station (or base station) then decreases transmission power thcreoiaccording lo the command. Unit is, in the normal power control method, a receiving part) (01 iccc.v;r> measure* a iecuving power of a signal transmitted from a transmitting party and transmits a normal power control bit generated in accordance wita tlit me&tjrcd nowijr. A transmitting party for transmitter} then control; pir.vcr cf a tran?rr.i.tsion signal according lo the received normal power control bit. The normal power control bit refers lo an information bit generated fur the normal power control.
DtfentlvePunt! CoyiUo'i
A base :t:.t;'on :\>r n.:'n) w.rnm; StP. cfa rec"iivcrf rcirte link si^ral i'i lower ;l. jn a threshold That is, the base station transmits a normal power control bit. When transmission power of the mobile station {or base station), to be increased according to the command, falls within a transmission power range given as a svstcm parameter, the mobile station increases transmission power thereof according to the command. However, when tn::"r.r.-.i:.S:on pv.vcr of Lhc mousfe stone. [6: &"i a- a .-.y^fe'n fafunet;r, the mobile station maintains the present transmission power thereof Tur'her. Ibr ba"c si3t:t?n (or mobile station) commands the mobile station (or base station) to decrease transmission power when
. 47 -

the SIR of the received reverse link signal is higher than the threshold. Thai is, the base station (or mobile station) transmits c normal power control bit, end the mobile station (or base station) decreases transmission power thereof according to the command. For the power-down command, the defensive power control method has the same operation as that of the normal power control method. However, for the power-up command, the two power control methods operate differently ail described above.
c. /-y"'T:inl, in FIGs. 5A and(5E.Jrefcrencc numeral 500 represents continuous transmission (DC-t) tor a forward dedicated control channel (F-DCCH) and reference numeral 510 represents continuous transmission (IX>1J for a reverse pifot'PCB channel. Second, in HCi. SA and 56, reference numeral 520 represents DO1'2 gated transmission for a forward decried cj.ltol ^liinnci and ixt&rencc numeral 530 ivprescnts DC=l/2 gated transmission fora reverse pilot/PCB channel. Third, in I iOs. 5A and 5B, refci*nc" numeral 540 represents DO I '4 gsted trAns*rK$irn for a fi*rwait! deiilcuted control chttine) and refe^nce nymera! 550 rrpresents DO-1"! ga^ed tww.n;?sior tor r. r*Y?rsc pilot/PCB channel Foun^. in FIG*. 5A ard 5B, reference nnmercl 560 represents DC" 1/8 gated Transmission for a forward dedicated control channel a"vJ refcrencr numtra! 570 represents DC-1/8 gated transmission for a reverse pilot/PCB channel.
Reference numerals 500 and 510 of FIGs. 5A and 5C represent power control methods for a reverse pilot/PCB channel for continuous transmission (DC=1) when an R-DCCH is not activated in the control hold state. In this case, the forward power control and (he reverse power control are performed at the same intervals.
- 48 -

Reference numerals 520 and 530 of FIG. 5A represent power control methods for a reverse pikrt/PCB channel for DC-1Q. regular gated transmission when an R-DCCH is noc activated in the control bold state. In this case, the forward power control and the reverse power control are performed at the same intervals. A location of the reverse power control bit in the forward channel is determined according to a gating pattern for the reverse link. The reverse power control bit is generated according to the normal power control method. For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a reverse gating pattern within one frame. In the embodiments of FIGs. SA to 5D, the offset has a positive value. FIGs. 5A to 5D illustrate normal power control methods tor the case where the R-DCCH is not activated in the control hold Jiidtt. FIGs f'"A 10 OL> illustrate power control methods for the case where an R-DCCH is auivated.in the control hold state, wherein the defensive power control is used Since a tomion whtit & revcrcc power control bit is located in the forward channel is determined iicciwding *o a gating pa"ten for ti reverie link, inert occurs a time delay when transmitting art valid revcrr-t powc* coittro! command, the delay is uniform sinie the gating pattern is 6 regular gating pattern. That is, in FIG. 5A, a reverse power control toininuad 522 is applied to ?. power centre) grout) 532 of a reverse pilot/PCB shanrcl.
Reference numerals 540 and 550 of FIG. 5B represent power control methods for tX>1/4 regular gated transmission of a reverse pilot/PCB channel when an R-DCCH is not activated in the control hold state. In this case, the forward power control and the reverse power control are performed at the same intervals. A location of the reverse power control bit in the forward channel is determined according to a gating pattern for the reverse link. The reverse power control bit is generated according to the normal power control process.
- 49 -

For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a, forward gating pattern within one frame. As shown in FIGs 5A to 5D. when an R-DCCH is no! activated in the control hold state, ihc normal power control is performed. However, as shown in FIGs. 6A to 6H, when the R-DCCH is activated in the control hoW slate, the defensive power control is performed. Since a location where a reverse power control bit is located in the forward channel is determined according to a gating pa act n ibr a reverse link, there occurs a time delay when transmitting one valid reverse power control command. The delay is uniform since the gating pattern is a regular gaiir*g pattern. A reverse power contrail command 342 is applied to a power control group 552 on f ravens: pil-v.'PCR c'lar.r.e!.
Reference nur^cmlv 560 nw* ^70 in *IO r'B rspusent pu-.vur <: methods for pol regular jvued fran when an p-occm is n ac in the control hcid state. this case tbrward power and reverse cw p-.tfonncd at same intervals. a location of bit lh forward channel determined according to gating pattern link. generated normal process. effective offset which may be given as system parameter provided between within one frame. shown figs. r-dcch not activated hold state performed. however slate ine defensive since where bii located io iink there occurs time delay wten transmitting valid> - 5o -

command. The delay is uniform since the gating pattern i$ an regular tytmQfpmtm. A reverse power control command $62 is applied to a power control group 33&>%?utverse pilot/PCB cbannel.
Reference numerals 521 and S31 in FIG 3C represent power controlw#pd" for DC-1 fl irregular gawd transmission when an R-DCCH is not activated in tfxconftol hold side, in this case, the forward power control and the reverse power conmtf awppformed at tr:? isoti intervals. A location of the reverse power control bit in the forwarfrfhpnnc! is ^cterroin*d rtccc .^inf; to a g^tmg pattern Jo.- the lev ers* link. Tht reverse powor£g"(rol bit is generated according lo the normal pov. er vcr.nol precis* J'or ertectivc power control, art i offset which my be given ts \ sy^ttr?. part.m*ict i;, p;ov;Jvxi bawcen *t for"ari gating paiwm nnd,a forward geting psitttrn v-'rAir. orefvan>t Ai ."ho^vn jr. f ;^i. 5Ate38X when an R-DCCH is not activated in ih? control fcoH flats. *he normo' po^vcr control &|jerifornK?|J. However, as shown in FIGs. 6A-6H. when the R-OCCH i Reference numerals 541 and 551 in fiU. 5D represent power control methods fix DC- 5/4 irregular gated transmission when an R-DCCH is not activated in the coattsl hofd f-tiiie. f:i :hh vfije. the inrward power contrul and the reverse power control are performed
- 5I -.

at the same intervals. A location of the reverse power control bit in the forward channel is determined according to a gating pattern for the reverse link. The reverse power control bit is generated in the normal power control method For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a forward gating pattern within one frame. As shown in FTGs. 5 A to 5D, when an R-DCCH is not nctfvatcd in rh! is performed. Further, wher the R-OCCH '.i activated tpon generation of a control signal to be transmitted, it is pcsj'ble to ;rens^nit the control signal at the gating rale ) (DC" I) Since a location where a reversr power control b:t is located in the forwttrd channel is determined according to a gating pattern for a revcr.ss I;nk, there occurs a time delay when transmitting one valid reverse power control command. The delay is not uniform since the gating pattern is an irregular gating pattern. A reverse power control command 543 is applied to a power control group 553 on a reverse pitot/PCB channel.
Reference numerals 56 ] d and 571 d in FIG. 3D represent power control methods for i)C-t /" trreguiar gated transmission when an K-DCCH is not activated in the control hold siBit Iri this c"$e, ihc forward power control and the reverse power control arc performed at the mtxvs intervals. A iocaUon of the revcr>e power control bit in the forward channel is determined tccorcirtg u> a gatiiig patlein for the reverse link. The reverse power control bit is geiuraicd if :hc r.o.-mal p->."ier control mcitKid. for tflfcctive power control, an offset wirich mav He jWcr ±. Kowevc.
- 52 -

as shown in FIGs. 6A-6H, when tbe R-DCCH is activated in the control hold stale, the defensive power control is performed. Further, when the R-DCCH is activated upon generation of a control signal to be transmitted, it is possible to transmit the control signal at the gating rate 1 Sekrcrxc numeral* t-00 and 6 JO in rIGs. 6A and 6C show ping-pong diagram* for reverse powtr control v";h respect u>ths Case 300 wf FIG. 3, when tin R-DCCH is activated in the control IJ.MJ Male PIG*.. 6A a:C 63 tr.ow the cases where is> offset between " gs'irg patten has >\ nc";j-:;vc value. That is, in dit* case, ihe number oi'forwptrf jy"w Reference numerals t>20 and 630 in F|(j. 6A represent power control methods for JX>l/2 reguior gated transmission when an R-DCCH is activated in the control hold stale
- 53 -

according to an embodiment of the present invention. In this case, the forward power control and the reverse power control are performed at the same intervals. A location of the reverse power control bit in the forward channel is determined according 10 a gating pattern for the reverse link. For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a forward gating pattern within one frame (ofTset - 54 -

make the determination while the R-DCCH is actually transmitted, unless there is provided a message or indicator for indicating existence of the R-DCCH. since the determination is made after channel coding and CRC checking for the received R-DCCH. Therefore, for the duration where the R-DCCH is transmitted over the forward channel, the base station can transmit the reverse power control command only at a power control group or time slot which is prescribed according to the gating pattern. The mobile station autonomously performs either normal power control or defensive po%*i" control accc/ding to iiie reverse puwer control command received at she prescribed power control group or time slot.
Reference numerals 640 and 650 in FTC. 6B represent power control methods for DC-1M regular gated transmission when an R-DCc.':H i" ectivated in the ccvim.¦' tV!d state. In this case. th" forward power control and the reverse power control are p*r*br"ned ai the same intervals. A location of the reverse power control bit in the forward channel is determined according to a gating pattern for the reverse link. For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a forward gating pattern within one fra/rt (jJTsrt-?i, Either nonna! power ci>ntrol or defensive power control is performed at a location where the R-DCCH is activated in the control hold state. A mobile station autonomy sly pcfior.us cither normal power control or defensive power control according to the reverse power control command received at a power control group or tniK slot which was preach bed according "o the gating pattern. In a system employing the defensive power contioi, reference numeral 642 represents a reverse power cor*rc! commend £C;K%;VVU in :he rmnriui power control process. Upon receipt of the power control command 642, the mobik station performs the defensive power control at a defensive power control duration.
- 55 -

Reference numerals 660 and 670 of FIG. 6B represent power control methods for DC-1/8 regular gated transmission wben an R-DCCH is activated in the control hold state. In this case, the forward power control and the reverse power control are performed at the same intervals. A location of the reverse power control bit in the forward channel is determined wcteding lo i gating pattern for the reverse link. For effective power control, an otfsa which may rv -jven as a system parameter is provided between a forward gating patter* and a forward guung pattern within one frame (offseK-0). Either normal power control or defer**ve power control is performed at a location where the R-DCCH is activated in the control hold state. In the cases 660 and 670, & mobile station cannot perforate defensive power control, since no reverse power control command is received at the R-DCCH duration.
Reference numerals 621 and 631 of /'JG. 6C represent power Control methods for DC-1/2 regular gated transmission when on R-DCCH is activated in the control hold state. In this case, the forwwd power coniroJ and the reverse power control arc performed at the riftme irrervalr A louition of ih*: revirst power £cr\!xol l\t in the forward channel is determined according to a gating pattern for the reverse link. For effective power control, 3n offset which- may be given ?s n j.y"lem paiairctt'it JS provided between a Iwwaid gating pattern and a forward gating pattern within one frame (oftset>0). Rither normal power control or defensive power control is performed at a location **hrrc the R-DCCH is a:riv3f?>1 in 'ta control hold iiatc A mtibik1 s/aiion autoaomn: o cc>riKiUul receiveu "t a power comroi group or time slot which w"s pmrjcnbH a<:ccrdinp to the paling pattern. in a system employing defensive power control reference numeral> - 56 -

represents a reverse power control catnmand generated in the normal power control process. Upon receipt of the power control command 623, the mobile station performs the defensive power control at a defensive power control duration. To minimize a MAC message processing time, the R-DCCH is transmitted to the other party at a transmittable location of the R-DCCH without an advance notice. A base station processes data in the frame unit of the F-DCCH at the transmittable location of the R-DCCH to determines whether the R-DCCH has been transmitted. When it is determined that the R-DCCH has been transmitted, the base station processes a message transmitted over the R-DCCH. For the determination process, a CRC (Cyclic Redundancy Code) obtained after channel decoding and energy of a received signal can be used. With regard to a time point where the base station determines whether the R-DCCH exists or not, it is not possible to make the determination while the R-DCCH is actually transmitted, unless there is provided a message or indicator for indicating existence of the R-DCCH, since the determination is made after channel coding and CRC checking for the received R-DCCH. Therefore, for the duration where the R-DCCH is transmitted over the forward channel, the base station can transmit the reverse power control command only at a power control group or time slot which is prescribed according to the gating pattern. The mobile station autonomously performs either normal power control or defensive power control actording to the reverse power control command received at the prescribed power control group or time slot!
Reference numerals 641 and 651 of FIG 6D represent power control methods for DC-1/4 regular gated transmission when an R-DCCH is activated in the control hold state In this case, ihe fotwam power control one! the inverse power cc-ntiol are perforjied nt the same intervals. A location of ihe reverse power conucl bit m :hc forward chuittel is
- 57 -

determined according to a gating pattern for the reverse link. For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a forward gating pattern within one frame (ofTsetX)). Either normal power control or defensive power control is performed at a location where the R-DCCH is activated in the control hold state. A mobile station autonomously performs cither normal power control or defensive power control according to the reverse power control command received at a power control group or time slot which was prescribed according to the gating pattern. In a system employing the defensive power control, reference numeral 643 -ciut"cr.f?: ? r*vme power control command generated in the normal power control process. 1 ipr." :c-(;?'pi o"? ;}ie power control command 643, the mobile static:* performs 'he defensive power control at a defensive power control duration-Reference numerals 661 and 671 of F1O. 6D represent power control methods for DO 1 /8 regular gated transmission when an R-DCCH is activated in the control hold state. In this case, the forward power control and the reverse pewrr control ar* prribrrncd at the same intervals. A location of the reverse power control bit in the forward channel is determined according to a gating pattern tor the reverse link. For effective powet control, an offset which may be given as a system parameter is provided bcrat-en II fo:v"aid gating pattern nnd a forward gating pattern At chin cue friura (oth;i>0;. Eifj.ti" ::or.au! power control or defensive power control is performed at a location where the R-DCCH is activated in the control hold state. A mobile station autonomously performs either normal power control o* t'cfeiwivr rov/c cortr.-,! fcr^nrdrr.j? *c the revrrsr pewrr con?rol command received at a pe\*.v ccrtir! ^r>>op **/¦ One jlnt wVch '*"ps pr^scrh-;! 2cccrtf;ng ro the gating pancrn. In a system employing the defensive power control, reference numeral 663
- 58 -

represents a reverse power control command generated in the normal power control process. Upon receipt of the power control command 663, the mobile station performs the defensive power control at a defensive power control duration
FIGs 6E to 6H illustrate power control procedures during activation of a reverse dedicated control channel (R-DCCH) according to an embodiment of the present invention. FJGs, 6E and 6F show the cases where an offset between a forward gating pattern and a reverse gating pattern has a negative value. That is, in this case, the number of forward power control groups or time slots, in which a reverse power control command is included, is smal ler than the number of reverse power control groups or time slots to which the it -'ersc power control command is applied. On the contrary. FlGs. 6G and 6H show the cases "-here an oft set between a forward gating pattern and a reverse gating pattern has t1 positive value. I hat is, in this case, the number of forward power control groups or time slots, in which a reverse power control command is included, is larger than the nuni^f ¦ "*f " w":yse po-ver control groups or time slots to which the reverse power control command is applied.
Keleience mmictais 620 aim 630 oi'FlG. 6c represent powei control methods for 00*1/2 regular gated transmission *vhe!t an R-DCCH is actr'iicd ir tht contra! hold "*te accot ding to wer coaucl bit in liie lorv.a.-d channel is de;cmu.*cd ariordidg co a gating paiicni Lor \ht reverse link. For effective power control, an offset which may br giv?n a$ a system parameter is provided between a forward gating pattern and a forward gating pattern within one frame. Either normal power control or defensive power control is performed at a
- 59 _

location where the R-DCCH is activated in the control hold state For defensive power control, upon receipt of a power-down command generated in the normal power control process, a mobile station decreases transmission power according to the received power control command; however, upon receipt of a power-up command, the mobile station maintains the present Iran s miss ion power when transmission power to be increased is higher than a threshold which is given as a system parameter. In a system employing the defensive power control, a reference numeral 622 represents a reverse power control command generated in the normal power control process. Upon receipt of the reverse power control command 622, the mobile station performs the defensive power control at a valid power control bit duration (hereinafter, referred to as "defensive power control duration"). To minimize a MAC message processing time, the R-DCCH is transmitted to the other party at a trans mittable location of the R-DCCH without an advance notice. A hose station processes data in the frame unit of the f-DCCH at the transmiuable location of the R-DCCH 10 determines whether the R-DCCH has been transmitted. When it is determined that the R-DCCH has been transmitted, the base station processes a message transmitted over the R-OCCH. For the determination process, a CRC (Cyclic Redundancy Code) obtained after channel decoding and energy of a received signal can be used. With regard to a time point where the base station determines whether the R-DCCII exists or not, it is not possible to make the determination while the R-DCCH is actually transmitted, unless there is provided a message or indicator for indicating existence of the R-DCCH, since the determination is made after channel coding and CRC checking for the received R-DCCH. Therefore, for the duration where the R-DCCH is transmitted over the forward channel, the base station can transmit the reverse power control command only at a power control group or time slot which is prescribed according to the gating pattern. The mobile station autonomously
- 60 -

performs either normal power control or defensive power control according to the reverse power control command received at the prescribed power control group or time slot.
Reference numerals 640 and 650 in FIG. 6F represent power control methods for DO 1/4 regular gated transmission when an R-DCCH is activated in the control hold state. In this case, the forward power control and the reverse power control are performed at the same intervals. A location of the reverse power control bit in the forward channel is determined according to a gating pattern for the reverse link. For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a forward gating pattern within one frame. Either normal power control or defensive power control is performed at a location where the R-DCCH is activated in the control hold state A mobile station autonomously performs either normal power control or defensive power control according tc the reverse power control command received at a power control group or time slot which was prescribed according to the gating pattern. In a system employing the defensive power control, reference numeral 642 represents a reverse power control command generated in the normal power control process. Upon receipt of the power control command 642, the mobile station performs the defensive power control at a defensive power control duration.
Reference numerals 660 and 670 of FIG. 6F represcm power control methods for DO1/K regular gated transmission when an R-DCCH is; activated in the control hold state. In this case, the forward puwe* control and the reverse power control ere performed at the same intervals. A location of the reverse power control bit in the foiward channel is determined according to a gating pattern for the reverse link. For effective power control.
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an offset which may be given as a syslcm parameter is provided between a forward gating pattern and a forward gating pattern within one frame. Either normal power control or defensive power control is performed at a location where the R-DCCH is activated in the control hold "uttc. ?n a system employing the defensive power control, reference numeral 662 represents H reverse power control command generated in the normal power control process. Upon receipt of the power control command 662. the motale station performs the defensive power control at a defensive power control duration,
Reference numerals 621 and 631 of DC "C bs Kiven SK" & system ittnuneicr is provided between a forward gating pattern and a forward gating pattern withir one frame. Either normal power control or defensive power control is performed at a location where the R-DCCH is activated in the control hold slate Fo- defensive power control, ti|ton receipt of a power-down command generated in the normal power control process, a mobile station de*:fMres transmission power according to the received pow?rioinrol command; however, upon receipt of a power-up command, the mobile station maintains the present irsr.simssion power when iransmis&icr. power la be increased is higher than a threshold which is given as a system parameter. In a system employing me defensive power control, reference numeral 623 represents a reverse power control command generated in the normal power ccr.Tol process. \ loon receipt e*>he powe; control Cv^umand 623. the mobile station performs the defensive
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power control at a defensive power control duration. To minimize a MAC message processing time, the R-DCCH is transmitted to the other party at a transmittable location of the R-DCCH without an advance notice. A base station processes data in the frame unit of the F-DCCH at the transmittable location of the R-DCCH lo determines whether the R-DCCH has been transmitted. When it is determined that the R-DCCH has been transmitted, the base station processes a message transmitted over the R-DCCH. For the determination process, a CRC (Cyclic Redundancy Code) obtained after channel decoding and energy of a received signal can be used. With regard to a time point where the base station determines whether the R-DCCH exists or not. it is not possible to make the determination while the R-DCCH is actually transmitted, unless there is provided a message or indicator for indicating existence of the R-DCCH, since the determination is made after channel coding and CRC checking for the received R-DCCH Therefore, for the duration where the R-DCCH is transmitted over ihe forward channel, the base station can transmit the reverse power control command only at a power control group or time slot which is prescribed according to the gating pattern. The mobile station autonomously performs either normal power control or defensive power control according to the reverse power control command received at the prescribed power control group or lime slot.
Reference numerals 641 and 651 of FIG. 6H represent power control methods for DC = 1/4 regular gated transmission when an R-DCCH is activated in the control hold state. In this case, the forward power control and the reverse power control are performed at the same intervals. A location of the reverse power control bit in the forward channel is determined according to a gating pattern for the reverse link. For effective power control, an offset which may be given as a system parameter is provided between a forward gating.
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pattern and a forward gating pattern within one frame. Either normal power control or defensive power control is performed at a location where the R-DCCH is activated in the control hold state. A mobile station autonomously performs either normal power control or defensive power control according to the reverse power control command received at u power control group or time slot which was prescribed Hccording to the gating pattern. In a system employing the defensive power control, reference numeral 643 represents a reverse power control command generated in the normal power control process. Upon receipt of the power control command 643, the mobile station performs the defensive power control at a defensive power control duration.
Reference numerals 661 and 671 of FIG. 6H represent power control methods for DCH /8 regular gated transmission when an R-DCCH is activated in the control hold slate. In this cast, the forward power control and the reverse power control are performed at the same intervals. A location of the reverse power control bit in ihe forward channel is determined according to a gating pattern for the reverse link. For effective power control, an offset which may be given as a system parameter is provided between a forward gating pattern and a forward gating pattern within one frame, blither normal power control or defensive power control is performed at a location where the R-DCCH is activated in the control hold state. A mobile station autonomously performs either normal power control or defensive power control according to the reverie power control command received at a ¦tower control group or time slot which was prescribed according to the gating pattern. In tt system employing the defensive power control, reference numeral 663 represents a reverse power control command generated in the normal power control process. Upon receipt of the power control command 663. the mobile station performs the defensive power control at a
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defensive power control duration.
FTG 7A shows a reverse power control procedure for multiple reverse dedicated control channels (R-DCCHs) using sharable forward dedicated control channel (F-DCCH) in a control hold Mate according no an embodiment of the present invention. For simultaneous power control for multiple reverse dedicated control channels, power control symbols undergo code division multiplexing at the same location using an orthogonal code. Reference numeral 710 represents a method for transmitting the power control symbols using a Walsh code, which is an orthogonal code. FIG. 7B shows reverse power control commands for the multiple reverse channels of FIG. 7 A, according IO an embodiment of the present invention In FIG. 7B, powcr*upMown commands can be transmitted for tour reverse dedicated control channel in maximum. FIG. 7C shows reverse power control commands for the multiple reverse channels of FIG. 7A. according to another embodiment of the present invention. In FIG. 7C, power-urVstay/down commands can he transmitted for four reverse dedicated control channel in maximum. As shown in the cu&e 700 of FIG. 7 A, a code division multiplexed-power control symbol tor normal power control exist* only at a corresponding power control group according to a gating pattern for a reverse channel, and a code division multiplexed-power control symbol for defensive power control exists at a corresponding power control group according to whether the R-DC'CH is activated or not.
Reference numerals 830,850 and 870 of FIG. RA show methods for providing a time diversity to transmission signal of a mobile station. Referring to FIG. 8A. reference numeral 820 shows a case where a base station receives a signal transmitted from a mobile station nnd transmits a reverse power control command of a relatively lower rate over a forward
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channel at predetermined regular locations. Transmitting the transmission signal of the mobile station at a low rate for a long time and transmitting the transmission signal by regular gated transmission at the same rale cause a reduced burden for fast power control shown by reference numeral 800 because of using the time diversity, as compared with a signal having a low time diversity.
Reference numerals 834,854 and 874 of FIG. 8B show methods for providing a time diversity to transmission signal of a mobile station. Referring lo FIG. 88, reference numeral 820 shows a case where a base station receives a signal transmitted from a mobile station and transmits a reverse power control command of a relatively lower rate over a forward channel according to a gating pattern for a reverse channel. Transmitting the transmission signal of the mobile station "t a low rote for a long time and transmitting the transmission signal by gated transmission at the same rate cause a reduced burden for fast power control shown by reference numeral 800 because of using the time diversity, as compared with a signal having a low lime diversity.
Reference numerals 920 of FIG 9A shows a method for providing a time diversity to transmission signal of a base station, wherein the transmission signal is transmitted at a low rate tor a long time. Reference numeral 950 shows a case where a mobile station receives a signal 920 transmitted from the base station and transmits a forward power control command of a relatively lower rate over a reverse channel. Transmitting the transmission signal of the mobile station at a low irate for a long time causes a reduced burden for fast power control shown by reference numeral 930 because of using ihe time diversity, as compared with a signal having a low time diversify
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Reference numerals 922 of FIG. 9B shows a method for providing a time diversity to transmission signal of a base station, wherein (he transmission signal is intermittently transm itted ai regular interval at the same rate for a long time. Reference numeral 952 shows a case where a mobile station receives a signal 922 transmitted from the base station and transmits a forward power control command of a relatively tower rate over a reverse channel. Transmitting the transmission signal of the mobile station at a low rate for a long time causes a reduced burden for fast power control shown by reference numeral 930 because of using the time diversity, as compared with a signal having a low time diversity.
Reference numerals 924 of FIG. °C shows a method for providing a time diversity to transmission signal of a base station, wherein the transmission signal is intermittently transmitted at irregular interval at the same rate for a long time. Reference numeral 954 shows a case where a mobile station receives a signal 924 transmitted from the base station and transmits a forward power control command of a relatively lower rate over a reverse channel. Transmitting the transmission signal of the mobile station at a low rate fnr a long time causes a reduced burden for fast power control shown by reference numeral 930 because of using the time diversity, as compared with a signal having a low time diversity.
I: ;;hc*uW be noted ii>8t ih .* gating rate and the gating time are previously scheduled between a base -lotion and a mobile station. Further, the gating rate is determined according to a channel condition. For example, the gating rate decreases from 1/2 to 1 /4 for a good channel condition and increases from 4/1 to 1/2 for a bad channel condition. The gating time depends on a transition method to the control hold state. That is. when a state transition OCCUR by traisnUt-r.g a 'tare transition message, it U possible ;o determine a gating Stan
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time. Even in she case where the state transition occurs using a timer, ii is possible to synchronize a gating start time of a base station to a gating start time of a mobile station. Although the present invention has been described with reference to an embodiment which performs gated transmission in the case where a transitions to a control hold state occurs because there is no user data to exchange for a predetermined time, the invention can also be applied to a case where a discontinuous transmission period continues for a long time in an active stale without transition to the control hold state
As .rtaied above, the comf.w.* trjiism^von of the reverse pilot/PCB channel in the conventional control hold state is advnnta,c-:ou:,? cwiapt tr*jr"mis";ion increases interference to the reverse link, causing a reduction in rapsc'iv of the reverse (ink. Further, constant transmission of the reverse wwr zrw;* r>i;y yi*:\ .'he tfarward link causes an increase in inwrieunce tu the forward link and a decrease in capacity of ihe forwa'id link. In addition, the constant transmission of the reverse jf>ower control bits may incref.se power consumption
A novel method suppresses unnecessary transmission of a control signal in the control hoM sure "o ft* to minimize rrsync acquisition time, an increase in interference due to transmission of the icverse piiot/PCB cn&nnel and an increase in interference due to transmission of reverse nmver control bits over the forward link
While the invention has been shown and described with reference to a certain pr;tfcrrrd embodiment thereof,:: will be underwood hy those skillc-1 in th-: art that various changes in form ami details may be made therem without departing trom tnc spirit and scope
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of the invention as defined by the appended claims.
- €9 -

WE CLAIM
1. A transmission device for a mobile station in a code division multiple access (CDMA)
communication system, comprising:
a channel signal generator for generating a reverse pilot channel signal for a reverse link; and
a gating controller for intermittently transmitting the reverse pilot channel signal received from the channel signal generator according to a predetermined gating rate in a control hold state,
wherein said transmission is intermittent during said control hold state and continuous during a message transmission state.
2. The transmission device as claimed in claim 1, wherein the channel signal generator
comprises:
a multiplexer for multiplexing the reverse pilot channel signal and power control information on the reverse link on a power control group unit basis;
an orthogonal modulator for orthogonally spreading an output of the multiplexer with an orthogonal code assigned to the channel; and
a gating element for gating the orthogonally spread signal according to an output of the gating controller.
3. The transmission device as claimed in claim 2, wherein the gating controller operates
to transmit the reverse pilot channel signal by activating power control groups within a
1/2 frame duration from among power control groups within a one frame duration.
4. The transmission device as claimed in claim 2, wherein the gating controller operates
to transmit the reverse pilot channel signal by activating power control groups for a 1/4
frame duration from among power control groups within a one frame duration.
5. The transmission device as claimed in claim 2, wherein the gating controller operates
to transmit the reverse pilot channel signal on the reverse pilot/PCB channel by activating
power control groups for a 1/8 frame duration out of power control groups within a one
frame duration.
6. A transmission device for a base station in a CDMA communication system,
comprising:
a dedicated control channel signal generator for puncturing a control message to be transmitted and inserting power control information in the punctured message for controlling transmission power of a reverse link; and
7o

a gating controller for intermittently transmitting the power control information from the dedicated control channel signal generator according to a predetermined gating rate in a control hold state,
wherein said transmission is intermittent during said control hold state and continuous during a message transmission state.
7. The transmission device as claimed in claim 6, wherein the dedicated control channel
signal generator comprises:
a control message generator for generating a control message to be transmitted over a dedicated control channel;
a puncturer-inserter for puncturing the control message at a predetermined location and inserting the power control information in the punctured control message to control transmission power of the reverse link;
an orthogonal modulator for orthogonally spreading an output of the puncturer-inserter with an orthogonal code assigned to the dedicated control channel; and
a gating element for gating the orthogonally spread control message on the dedicated control channel according to an output of the gating controller.
8. The transmission device as claimed in claim 7, wherein the gating controller operates
to transmit corresponding power control groups for a 1/2 frame duration out of power
control groups within a one frame duration for the dedicated control channel signal.
9. The transmission device as claimed in claim 7, wherein the gating controller operates
to transmit power control groups for a 1/4 frame duration out of power control groups
within a one frame duration for the dedicated control channel signal.

10. The transmission device as claimed in claim 7, wherein the gating controller operates
to transmit power control groups for a 1/8 frame duration out of power control groups
within a one frame duration for the dedicated control channel signal.
11. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
generating a pilot channel signal for a reverse link; and
intermittently transmitting the pilot channel signal according to a predetermined gating rate in a control hold state,
wherein said transmission is intermittent during said control hold state and continuous during a message transmission state.
71

12. The transmission method as claimed in claim 11, wherein the step of generating the
pilot signal and the power control bit comprises the steps of:
multiplexing the reverse pilot channel signal and power control information on the reverse link on a power control group unit basis; and
multiplying the multiplexed signal with an orthogonal code assigned to the channel.
13. The transmission method as claimed in claim 12, wherein the gating controller
operates to transmit the orthogonally spread multiplexed signal by activating power
control groups for a 1/2 frame duration out of power control groups within a one frame
duration for the channel signal.
14. The transmission method as claimed in claim 12, wherein the gating controller
operates to transmit the orthogonally spread multiplexed signal by activating power
control groups for a 1/4 frame duration out of power control groups within a one frame
duration for the channel signal.
15. The transmission method as claimed in claim 12, wherein the gating controller
operates to transmit the orthogonally spread multiplexed signal by activating power
control groups for a 1/8 frame duration out of power control groups within a one frame
duration for the channel signal.
16. A gated transmission method for a base station in a CDMA communication system,
comprising the steps of:
puncturing a control message to be transmitted to insert power control information for controlling transmission power of a reverse link in the punctured message; and
intermittently transmitting the power control information inserted control message over a dedicated control channel according to a predetermined gating rate in a control hold state,
wherein said transmission is intermittent during said control hold state and continuous during a message transmission state.
17. The transmission method as claimed in claim 16, wherein generating a power control
information inserted control message comprises the steps of:
generating a control message to be transmitted over the dedicated control channel;
puncturing the control message at a predetermined location and inserting the power control information in the predetermined location to control transmission power of the reverse link; and
orthogonally spreading the power control information inserted-control message with an
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orthogonal code assigned to the dedicated control channel.
18. The transmission method as claimed in claim 17, wherein the gating controller
operates to transmit the orthogonally spread control message by activating power control
groups for a 1/2 frame duration out of power control groups within a one frame duration.
19. The transmission method as claimed in claim 17, wherein the gating controller
operates to transmit the orthogonally spread control message by activating power control
groups for a 1/4 frame duration out of power control groups within a one frame duration.
20. The transmission method as claimed in claim 17, wherein the gating controller
operates to transmit the orthogonally spread control message by activating power control
groups by activating power control groups for a 1/8 frame duration out of power control
groups within a one frame duration.
21. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:

a) intermittently transmitting a reverse pilot signal and a power control bit according to a
predetermined gating rate in a control hold state;
b) upon generation of a message to be transmitted over a reverse dedicated control
channel for the reverse link, continuously transmitting the reverse pilot signal and the
power control bit at a transmission duration of the message; and
c) after transmission of the message on the reverse dedicated control channel, re-storing
to step a).

22. The gated transmission method as claimed in claim 21, wherein the reverse dedicated
control channel is a reverse dedicated MAC (Medium Access Control) channel.
23. The gated transmission method as claimed in claim 21, wherein the message on the
dedicated control channel is transmitted at an increased transmission power.
24. The gated transmission method as claimed in claim 21, further comprising the step of
increasing transmission power of the reverse pilot signal at a transmission duration of the
dedicated control channel to transmit the reverse pilot signal with the increased
transmission power.
25. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:

a) intermittently transmitting a reverse pilot signal and a power control bit according to a
predetermined gating rate in a control hold state;
b) upon activation of a message to be transmitted over a reverse dedicated control
73

channel for the reverse link and continuously transmitting the message on the reverse dedicated control channel; and
c) after transmission of the message on the reverse dedicated control channel, transmitting the reverse pilot signal and the power control bit, within at least one time slot, and returning to step a).
26. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
a) intermittently transmitting a reverse pilot signal and a power control bit according to a
predetermined gating rate in a control hold state;
b) upon activation of a message to be transmitted over a reverse dedicated control
channel for the reverse link and continuously transmitting the message on the reverse
dedicated control channel; and
c) after transmission of the message on the reverse dedicated control channel,
transmitting the reverse pilot signal and the power control bit, within one or more time
slots associated with a particular frame duration, and returning to step a).
27. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
a) intermittently transmitting a reverse pilot signal and a power control bit according to a
predetermined gating rate in a control hold state;
b) upon activation of a message to be transmitted over a reverse dedicated control
channel for the reverse link, transmitting the reverse pilot signal as a preamble signal and
continuously transmitting the message on tbe reverse dedicated control channel; and
c) after transmission of the message on the dedicated control channel, transmitting the
reverse pilot signal, within at least one time slot, as a postamble signal, and repeating step
a) during a next frame duration.
28. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
examining power control information received intermittently from a forward dedicated control channel; and
intermittently transmitting a reverse pilot signal and a power control bit according to a predetermined gating rate in a control hold state, and setting a transmission power level for the reverse pilot signal to be transmitted in accordance with the received power control information.
74

29. The gated transmission method as claimed in claim 28, wherein the received power
control information has a same pattern as a gating pattern for the reverse pilot signal and
the power control bit.
30. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:

a) intermittently transmitting a reverse pilot signal and a power control bit according to a
predetermined gating rate in a control hold state, and setting a transmission power level
for the reverse pilot signal to be transmitted according to power control information
received over a forward dedicated control channel;
b) upon activation of a message to be transmitted over a dedicated control channel for the
reverse link,
i) transmitting a reverse pilot signal, which is first generated after activation of the message and the power control bit, continuously transmitting a message on the reverse dedicated control channel,
ii) continuously transmitting the reverse pilot signal and the power control bit at a location equal to the transmission duration of the message on the dedicated control channel, and
iii) setting a transmission power level of the reverse pilot signal and the power control bit according to power control information received through the forward dedicated control channel; and
c) after transmission of the message on the dedicated control channel, repeating step a).
31. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
a) intermittently transmitting a reverse pilot signal and a power control bit according to a
predetermined gating rate in a control hold state, and setting a transmission power level
of the reverse pilot signal and the power control bit according to power control
information received over a forward dedicated control channel to transmit the signals
with the set transmission power;
b) upon activation of a message to be transmitted over a dedicated control channel for the
reverse link,
i) transmitting a reverse pilot signal, which is first generated after activation of the message and the power control bit,
ii) continuously transmitting a message on the reverse dedicated control channel,
75

iii) continuously transmitting the reverse pilot signal and the power control bit at a location equal to the transmission duration of the message on the dedicated control channel, and
iv) setting the transmission power level of the reverse pilot signal and the power control bit according to power control information received through the forward dedicated control channel; and
c) after transmission of the message on the dedicated control channel, transmitting the reverse pilot signal and the power control bit, within at least one time slot, and returning to step a).
32. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
a) intermittently transmitting a reverse pilot signal and a power control bit according to a
predetermined gating rate in a control hold state, and setting a transmission power level
of the reverse pilot signal and the power control bit according to power control
information received over a forward dedicated control channel to transmit the signal with
the set transmission power;
b) upon activation of a message to be transmitted over a dedicated control channel for the
reverse link,
i) transmitting a reverse pilot signal, which is first generated after activation of the message and the power control bit,
ii) continuously transmitting a message on the reverse dedicated control channel,
iii) continuously transmitting the reverse pilot signal and the power control bit at a location where the message on the dedicated control channel is transmitted, and
iv) setting transmission power of the reverse pilot signal and the power control bit according to power control information received through the forward dedicated control channel; and
c) after transmission of the message on the dedicated control channel, transmitting the
reverse pilot signal and the power control bit, within one or more time slots within a
corresponding frame duration, and returning to step a).
33. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
a) intermittently transmitting a reverse pilot signal and a power control bit according to a predetermined gating rate in a control hold state, and setting a transmission power level of the reverse pilot signal and the power control bit according to power control
7-6

information received over a forward dedicated control channel to transmit the signal with the set transmission power;
b) upon activation of a message to be transmitted over a dedicated control channel for the
reverse link,
i) transmitting as a preamble signal a reverse pilot signal, which is first generated after activation of the message,
ii) continuously transmitting a message on the reverse dedicated control channel,
iii) continuously transmitting the reverse pilot signal and the power control bit channel at a location where the message on the dedicated control channel is transmitted, and
iv) setting transmission power of the reverse pilot signal and the power control bit according to power control information received through the forward dedicated control channel; and
c) after transmission of the message on the dedicated control channel, transmitting the
reverse pilot signal, within a time duration equal to at least one time slot, as a postamble
signal, and returning to step a) during a next frame duration.
34. A gated transmission method for a mobile station in a CDMA communication system,
comprising the steps of:
examining power control information received intermittently from a forward common power control channel; and
intermittently transmitting a reverse pilot signal and a power control bit according to a predetermined gating rate in a control hold state, and setting a transmission power level of the reverse pilot signal and the power control bit according to the received power control information to transmit the signal on the reverse pilot channel with the set transmission power.
35. A transmission device for a base station in a CDMA communication, comprising:
a dedicated control channel signal generator for generating a power control bit for controlling transmission power of a reverse link according to a predetermined gating rate and outputting the generated power control bit as a dedicated, control channel signal; and
a gating controller for intermittently transmitting the power control bit according to the predetermined gating rate in a control hold state.
36. The transmission device as claimed in claim 35, wherein the dedicated control
channel generator comprises:
77

an orthogonal modulator for orthogonally spreading the power control bit with an orthogonal code assigned to the dedicated control channel; and
a gating element for gating the orthogonally spread power control bit according to an output of the gating controller.
37. The transmission device as claimed in claim 36, wherein the gating controller
performs gated transmission at a gating rate of 1/2.
38. The transmission device as claimed in claim 36, wherein the gating controller
performs gated transmission at a gating rate of 1/4.
39. A method for transmitting a power control bit for a base station in a CDMA
communication, comprising the steps of:
generating a power control bit for controlling transmission power of a reverse link according to a predetermined gating rate; and
intermittently transmitting the power control bit according to the predetermined gating rate.
7i?
40. The method in claim 39, wherein the gating controller performs gated transmission at
a gating rate of 1/2.
41. The method as claimed in claim 39, wherein the gating controller performs gated
transmission at a gating rate of 1/4.
This invention relates to a base station and a mobile station for a CDMA communication system intermittently exchange data on a power control group unit or time slot unit in a control hold state to minimize interference. To this end, during channel transmission, the system intermittently transmits a reverse pilot channel signal in the control hold state; upon activation of a reverse dedicated control channel, transmit a normal pilot channel signal which is first generated after activation of the reverse dedicated control channel; and then transmits the reverse dedicated control channel.

Documents:

00667-cal-1999-abstract.pdf

00667-cal-1999-claims.pdf

00667-cal-1999-correspondence.pdf

00667-cal-1999-description(complete).pdf

00667-cal-1999-drawings.pdf

00667-cal-1999-form-1.pdf

00667-cal-1999-form-18.pdf

00667-cal-1999-form-2.pdf

00667-cal-1999-form-3.pdf

00667-cal-1999-form-5.pdf

00667-cal-1999-g.p.a.pdf

00667-cal-1999-letters patent.pdf

00667-cal-1999-priority document others.pdf

00667-cal-1999-priority document.pdf

667-CAL-1999-FORM-27.pdf


Patent Number 207111
Indian Patent Application Number 667/CAL/1999
PG Journal Number 21/2007
Publication Date 25-May-2007
Grant Date 23-May-2007
Date of Filing 28-Jul-1999
Name of Patentee SAMSUNG ELECTRONICS CO., LTD.,
Applicant Address 46,MAETAN-DONG, PALDAL-GU SUWON-SHI,KYUNGKI-DO,
Inventors:
# Inventor's Name Inventor's Address
1 PARK SU-WON 1662-9,SHILLIM 8-DONG,KWANAK-GU SEOUL
2 KIM YOUNG-KY SUNKYONG APT.,12-1401,TAECHI-DONG ,KANGNAM-GU,SEOUL
3 AHN JAE-MIN PULEUN SAMHO APT.,109-303, IRWONPON-DONG,JANGNAM-GU SEOUL ,
4 KIM JAE-YOEL OF PAEKDOO APT.,960-1401 SANPON 9-DANJI,SANPON 21-DONG KUNPO-SHI KYONGGI-DO KOREA
5 KANG HEE WON 1499 MYONMOK 7-DONG,CHUNGNANG-GU SEOUL KOREA
PCT International Classification Number H 04 137/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 36681/1998 1998-09-03 Republic of Korea
2 30442/1998 1998-07-28 Republic of Korea
3 34146/1998 1998-08-22 Republic of Korea