Title of Invention

METHOD FOR CONTROLLING GATED TRANSMISSION OF DEDICATED CHANNEL IN W-CDMA COMMUNICATION SYSTEM

Abstract A method for gated transmission of a dedicated control channel signal for a base station in a W-CDMA communication system in which a dedicated data channel for transmitting packet data are multiplexed prior to transmission, the dedicated control channel having 15 slots in one frame and each slot comprising a TFCI bit, a TPC bit, and a pilot bit, the method comprising the steps of transmitting a gated transmission command message including a gating rate and a gated transmission start time for gated transmission of the dedicated control channel signal to a mobile station, if no daa exists on the dedicated data channel for a predetermined period of time; and transmitting the dedicated control channel signal discontinuously at the gated transmission start time set in the gated transmission command message.
Full Text METHOD FOR CONTROLLING GATED TRANSMISSION OF
DEDICATED CHANNEL IN W-CDMA COMMUNICATION SYSTEM
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a method of controlling gated
transmission (i.e., intermittent transmission of a dedicated control channel signal)
between a base station (UTRAN) and a mobile station (UE(MS)) in a W-CDMA
(Wideband-Code Division Multiple Access) communication system, and in
particular, to a method of efficiently using dedicated channels for transmission of
packet data.
2. Description of the Related Art
A conventional CDMA communication system, principally configured for
transmission of voice and data, transmits data on a dedicated channel. To do so,
a dedicated channel is assigned to transmit data and is released after the data
transmission is complete. The assignment and release of resources is frequently
done to provide services other than voice service, such as packet data service in
the conventional method. The resulting reconnection time delay makes it
difficult to provide satisfactory voice services. In many cases, packet data is
discontinuously transmitted, wherein a non-transmission period is interposed
between packet transmission periods. When transmitting packet data
discontinuously using the conventional channel controlling method, the channel
should be either released or maintained during the pauses between data
transmission. If the channel is released, reassignment of the channel is time
consuming and thus a satisfactory packet data service cannot be provided. On
the other hand, channel maintenance ties up resources and increases power
consumption causing interference.

Accordingly, there is a need for developing a new method of assigning a
channel to provide services other than voice service, for example, packet data
services. FIG. 1 illustrates the various states of an UE(MS) defined according to
the type of radio resources assigned for data transmission in a W-CDMA
communication system.
Referring to FIG. 1, the various channel states of the UE(MS) are
categorized into a CellDCH state where a dedicated channel is assigned for data
transmission, a Cell_FACH state which allows only transmission of a small
amount of data on a common channel, a Cell_PCH state which requests an
UE(MS) position to be registered in terms of a cell, and a URA_PCH (UTRAN
Registration Area_PCH) state which requests an UE(MS) position to be registered
in terms of a UTRAN Registration Area (URA). No data transmission is
allowed in both the Cell_PCH and URA_PCH states. Assignment of a dedicated
channel to an UE(MS) in the Cell_DCH state is considered in two ways: first, the
dedicated channel is continuously used until it is released; and second, the
dedicated channel is used only while a predetermined amount of data is
transmitted or data is transmitted for a predetermined time. The conventional
method supports an intermittent burst data transmission service by allowing
continuous use of a dedicated channel until all the data is transmitted, or releasing
a dedicated channel after transmission of burst data and then reassigning the
dedicated channel by use of a dedicated reassignment request message on a
common channel. In the former case, uplink and downlink dedicated control
channels should be transmitted continuously to maintain them even in the absence
of data to be transmitted on a dedicated data channel, thereby dissipating the
channels and unnecessary power. In the latter case, services cannot be provided
stably because the time to reassign channels varies.
FIGs. 2A to 3B are the structures of signals transmitted from a UTRAN
and an UE(MS) according to the conventional technology.
FIG. 2A illustrates the structure of an UE(MS) transmission signal upon
the absence of data to be transmitted on a uplink DPDCH (Dedicated Physical
Data Channel) during uplink data transmission, and FIG. 2B illustrates the

structure of a UTRAN transmission signal upon the absence of data to be
transmitted on a downlink DPDCH during downlink data transmission.
Reference numeral 200 in FIG. 2A and reference numeral 250 in FIG. 2B denote
time points when transmission of dedicated data channels are stopped due to
absence of transmission data on the uplink DPDCH and on the downlink DPDCH,
respectively. After the time points, only dedicated physical control
channels(DPCCH) are continuously transmitted so as not to lose synchronization
of the uplink and downlink. The continuous transmission of the dedicated control
channels (DPCCHs) is advantageous in that when uplink or downlink
transmission data is generated, the data can be reliably transmitted on the
dedicated data channels (DPDCHs) without any time delay. This can be
confirmed from FIGs. 3A and 3B.
FIG. 3A is a signal diagram illustrating data transmission on a uplink
dedicated data channel (DPDCH) upon generation of data to be transmitted on a
uplink during transmission of only a uplink dedicated control channel (DPCCH),
and FIG. 3B is a signal diagram illustrating data transmission on a downlink
dedicated data channel (DPDCH) upon generation of data to be transmitted on a
downlink during transmission of only a downlink dedicated control channel
(DPCCH). Reference numeral 300 in FIG. 3A and reference numeral 350 in FIG.
3B denote time points when data transmission resumes on the dedicated data
channel. Frames are transmitted again immediately after the time points when
transmission data is generated. Unfortunately, the continuous transmission of
uplink and downlink dedicated control channels (DPCCHs) increases interference
on the uplink and downlink. As a result, uplink and downlink channel capacities
are decreased and UE(MS) power consumption is increased.
Therefore, gated transmission of dedicated control channels (DPCCHs) is
preferable in order to use the transmission channels efficiently and to provide
stable service. Gated transmission also minimizes the increase of interference
caused by the continuous transmission of bidirectional dedicated controls
channels and the increase of power consumption in an UE(MS).
SUMMARY OF THE INVENTION

It is, therefore, a first object of the present invention to provide a method
of gated transmitting a dedicated control channel (DPCCH) in a gated mode when
data is not transmitted on a dedicated data channel for a predetermined time after
the dedicated channel is assigned in a mobile communication system.
It is a second object of the present invention to provide a method of gated
transmitting a uplink dedicated control channel signal in a gated mode by
requesting a gated transmission to a UTRAN when an UE(MS) has no data to be
transmitted on a uplink for a predetermined time in a mobile communication
system.
It is a third object of the present invention to provide a method of gated
transmitting a downlink dedicated control channel signal in a gated mode by
controlling an UE(MS) when there is no data to be transmitted on a downlink for
a predetermined time in a mobile communication system.
It is a fourth object of the present invention to provide a method of gated
receiving a uplink dedicated control channel signal in a gated mode from an
UE(MS) by a UTRAN in a mobile communication system.
It is a fifth object of the present invention to provide a method of gated
receiving a downlink dedicated control channel signal in a gated mode from a
UTRAN by an UE(MS) in a mobile communication system.
It is a sixth object of the present invention to provide a method of
transmitting data on a uplink by an UE(MS) when transmission data is generated
during gated transmission in a mobile communication system.
It is a seventh object of the present invention to provide a method of
transmitting data on a downlink by a UTRAN when transmission data is
generated during gated transmission in a mobile communication system.
Briefly, these and other objects can be achieved by providing a gated

transmission method. In the gated transmission method, a first party transmits a
message indicating that a gated transmission condition is satisfied. Upon receipt
of a response message from a second party, the first party transmits a gated
transmission command message. Then, the first party performs gated
transmission according to parameters included in the gated transmission message.
The parameters include a gating rate, a gated transmission start time, a gated
transmission pattern, and a power increment by which to increase the transmission
power of a channel when transmitting data on the channel during the gated
transmission.
BRIEF DESCRIPTION OF THE ACCOMPANYING RAWINGS
The above and other objects, features 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:
FIG. 1 is a state transition diagram for packet service in a W-CDMA
communication system;
FIG. 2A is a diagram of signals communicated between a UTRAN and an
UE(MS) when there is no data to be transmitted on a uplink according to
conventional technology;
FIG. 2B is a diagram of signals communicated between a UTRAN and an
UE(MS) when there is no data to be transmitted on a downlink according to the
conventional technology;
FIG 3A is a diagram of signals communicated between a UTRAN and an
UE(MS) when transmission of a uplink dedicated data channel resumes upon
generation of data to be transmitted on the uplink dedicated data channel in a non-
uplink dedicated data channel transmission state according to the conventional
technology;
FIG 3B is a diagram of signals communicated between a UTRAN and an
UE(MS) when transmission of a downlink dedicated data channel resumes upon
generation of data to be transmitted on the downlink dedicated data channel in a
non-downlink dedicated data channel transmission state according to the
conventional technology;
FIG. 4A is a flowchart illustrating an UE(MS) operation for a gated

transmission in the absence of uplink transmission data according to an
embodiment of the present invention;
FIG. 4B is a flowchart illustrating a UTRAN operation for a gated
transmission in the absence of downlink transmission data according to the
embodiment of the present invention;
FIG. 5A is a flowchart illustrating an UE(MS) operation upon generation
of uplink transmission data during a gated transmission according to the
embodiment of the present invention;
FIG. 5B is a flowchart illustrating a UTRAN operation upon generation
of downlink transmission data during a gated transmission according to the
embodiment of the present invention;
FIG. 6 illustrates a distributed channel structure and an exemplary
downlink gated transmission pattern;
FIG. 7A is a diagram of signals communicated between a UTRAN and an
UE(MS) when a gated transmission starts during uplink data transmission
according to the embodiment of the present invention;
FIG. 7B is a diagram of signals communicated between a UTRAN and an
UE(MS) when a gated transmission starts during downlink data transmission
according to the embodiment of the present invention;
FIG. 8A is a diagram of signals communicated between a UTRAN and an
UE(MS) upon generation of uplink transmission data during gated transmission of
a dedicated control channel according to the embodiment of the present invention;
FIG. 8B is a diagram of signals communicated between a UTRAN and an
UE(MS) upon generation of downlink transmission data during gated
transmission of a dedicated control channel according to the embodiment of the
present invention;
FIG. 9 illustrates a capability negotiation procedure in an UE(MS); and
FIG. 10 is the format of a gated transmission command message
according to the embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A preferred embodiment of the present invention will be described
hereinbelow with 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.
The present invention pertains to the gated transmission of a dedicated
control channel (DPCCH) when no data is transmitted for a predetermined period
of time during transmission of data via dedicated channels (DPDCH) in a W-
CDMA mobile communication system. Gated transmission minimizes the
power consumption and channel dissipation in an UE(MS), which result from the
continuous transmission of a dedicated control channel in the absence of data to
be transmitted on a dedicated data channel (DPDCH). The gated transmission of a
dedicated control channel (DPCCH) in the W-CDMA communication system is
advantageous because a physical channel can be maintained in sync, the
transmission power can be reduced, and a closed loop power control can be
implemented.
The following description is conducted assuming that a frame is 10msec
in duration, there are 15 power control groups present in one frame, and one
power control group is about 0.667msec in duration. However, those values are
merely selected for better understanding of the subject matter of the present
invention.
The gated transmission method of the present invention is not
continuously transmitting dedicated control channel signal but gated transmitting.
Whether a UTRAN determines gating parameters in response to an
UE(MS) request or the UTRAN requests an UE capability to determine gating
parameter, it can be further contemplated that the gating parameters can be set at a
call set-up by mutual agreement between the UTRAN and the UE(MS). The
gating parameters include a gating indicator, a gating rate, a gated transmission
start time, a gated transmission pattern, and an increase power strength when
transmitting data on dedicated data channel in the embodiment of the present
invention, but it is to be clearly understood that other parameters can be added
when necessary.

FIG. 4A is a flowchart illustrating a gated transmission procedure of a
uplink dedicated channel in an UE(MS) in the absence of uplink transmission data
according to an embodiment of the present invention.
Referring to FIG. 4A, the UE(MS) transmits control data on a uplink
dedicated control channel (DPCCH) and packet data on a uplink dedicated data
channel (DPDCH) in step 400. As above, after the UE(MS) transmits the data
on dedicated channel, the UE checks whether uplink transmission data exists in
step 401. In the presence of uplink transmission data, the UE(MS) returns to
step 400 and transmits the data. On the other hand, in the absence of uplink
transmission data, the UE(MS) transmits only control data on the dedicated
control channel (DPCCH) in step 402.
In step 403, the UE(MS) determines a time period for which no data is
transmitted on the dedicated data channel (DPDCH) in order to prevent gate
transmission during a short non-data transmission period. If the dedicated data
channel (DPDCH) has not been used for the predetermined time in step 403, the
UE(MS) checks whether data has been received on a downlink dedicated data
channel (DPDCH) in step 404. Checking whether data has been received on a
downlink dedicated data channel (DPDCH) ensures that the uplink and downlink
dedicated data channels (DPDCHs) are not transmitting and receiving. This is a
prerequisite for gated transmission on dedicated control channel (DPCCH)s
(DPCCHs). If data is received on the downlink dedicated data channel
(DPDCH), the UE(MS) returns to step 401 to check whether uplink transmission
data exist. Upon generation of uplink transmission data in step 401, the UE(MS)
returns to step 400. However, it can be further contemplated that since a uplink
gated transmission condition is satisfied in step 403, the UE(MS) skips step 404
and notifies the UTRAN that the UE(MS) is capable of uplink gated transmission
so that the UTRAN determines whether to perform gated transmission by
checking for the presence or absence of downlink transmission data.
In step 405, the UE(MS) checks whether data has been generated for
transmission on the uplink dedicated data channel (DPDCH) while checking
whether data has been received on the downlink dedicated data channel. If the

UE(MS) detects uplink transmission data in step 405, the UE(MS) returns to step
400. In the absence of uplink transmission data in step 405, the UE(MS)
transmits a message notifying that the gated transmission condition is satisfied to
the UTRAN in step 406. The message may be a MEASUREMENT REPORT
defined by the universal mobile telecommunication system (UMTS).
Then, the UE(MS) awaits receipt of a response message from the
UTRAN in step 407. The response message should include information about a
gating rate, a gated transmission start time, an increase power strength when
transmitting data on dedicated data channel to be used for power control during
gated transmission, and a gated transmission pattern, which is necessary for the
UE(MS) to perform a gated transmission. When the UTRAN prepare the
response message, the UTRAN reflects the result of checking whether downlink
transmission data exists and the gated transmission capability of the UE(MS) if
the UTRAN is informed of the capability through a procedure as shown in FIG. 9
in determining the gated transmission-related parameters. Furthermore, the
UTRAN can limit an available data rate for gated transmission and include the
data rate limit in the response message. The response message can be
constructed by adding message fields defined in FIG. 10 to a UMTS-defined
message "TRANSPORT CHANNEL RECONFIGURATION" or "PHYSICAL
CHANNEL RECONFIGURATION".
FIG. 10 illustrates the structure of a gated transmission command
message generated from a UTRAN, including parameters for gated transmission
of a dedicated control channel.
Referring to FIG. 10, a gating indicator 1000 can be a one bit-field for
informing whether gated transmission-related information exists. A gating rate
field designates a gating transmission rate 1010. N1 1020 indicates a gated
transmission start time and varies in the number of bits depending on the form
used to express the start time. N2 1030 is a field that provides a gated
transmission pattern. That is, N2 1030 determines whether a gated transmission
pattern is to be made periodical or random, or informs a downlink gated
transmission pattern to be used. N3 1040 provides a power increment of a

dedicated data channel which is used to compensate for power control losses that
occur during data transmission in a gated transmission mode.
FIG. 6 illustrates an example of gated transmission of a dedicated control
channel according to the embodiment of the present invention.
Referring to FIG. 6, reference numeral 600 denotes the structure of a
downlink channel and reference numerals 650 and 660 denote exemplary gated
transmission patterns of a downlink dedicated coatrol channel-. The gated
transmission in those patterns is possible because the dedicated control channel
is distributed as shown in the downlink channel structure 600. In the gated
transmission 650, only TFCI (Transport Format Combination Indicator) bits in
one slot are excluded from transmission on a dedicated control channel. In this
case, pilots are transmitted in all slots and TPC (Transmit Power control) bits are
transmitted or not depending on the transmission rate of the uplink dedicated
control channel. In the gated transmission 660, one entire slot is not transmitted.
The gated transmission rates in both cases are 1/2. Since a gated transmission
start time should be set with the UTRAN and the UE(MS) in accurate
synchronization with each other, the UE(MS) should wait until a gated
transmission start time designated in the response message as shown in step 408
of FIG. 4A. If the response message is received in step 407 of FIG. 4A and the
response message sets a limit for the radio resources to be used for gated
transmission, only those allowed radio resources should be used during the gated
transmission. In addition, gated transmission can be implemented on only one of
the uplink and downlink dedicated control channels according to whether the
UE(MS) and the UTRAN support gated transmission.
FIG. 7A is a diagram of transmitted and received signals of a UTRAN
and an UE(MS) when gated transmission is performed in the absence of data on a
uplink dedicated data channel during uplink data transmission. The drawing
shows UE(MS) signals when the message is not retransmitted notifying that a
gated transmission condition has been satisfied in step 407 of FIG. 4A.
In FIG. 7A, the uplink dedicated data channel is no longer transmitted

after the last frame in a period 700. The uplink dedicated data channel is not in
use for a period 710, which is checked in step 403 of FIG. 4A. In a period 720,
the UE(MS) transmits the message indicating that the gated transmission
condition is satisfied, receives the response message, and waits until the gated
transmission start time set in the response message. A period 730 varies
according to the response message. FIG. 7A shows a gated transmission route of
1/3. The UTRAN may set the gated transmission rate to 1/3 or 1/5.
FIG. 4B is a flowchart illustrating a gated transmission procedure of a
downlink dedicated channel in a UTRAN in the absence of downlink transmission
data according to the embodiment of the present invention.
Referring to FIG. 4B, the UTRAN transmits control data on a downlink
dedicated control channel and packet data on a downlink dedicated data channel
in step 450. The UTRAN checks whether downlink transmission data exists in
step 451. In the absence of downlink transmission data, the UTRAN transmits
only control data on the dedicated control channel in step 452 and checks a period
for which no packet data has been transmitted on the dedicated data channel in
step 453. If the dedicated data channel has not been transmitted for the
predetermined time in step 453, the UTRAN checks whether data has been
received on a uplink dedicated data channel in step 454 for the same reason as in
step 404 of FIG. 4A. Upon receipt of data on the uplink dedicated data channel,
which implies that the UE(MS) continuously transmits data, the UTRAN returns
to step 451 to check whether downlink transmission data has been generated.
If no data has been received on the uplink dedicated data channel in step
454, which implies that the gated transmission condition is satisfied, the UTRAN
checks again whether downlink transmission data has been generated in step 455.
In the absence of downlink transmission data in step 455, the UTRAN generates a
gated transmission command message and transmits it to the UE(MS) in steps 456
and 457. The message can be constructed by adding the fields defined in FIG.
10 to an UMTS-defined message, TRANSPORT CHANNEL
RECONFIGURATION or PHYSICAL CHANNEL RECONFIGURATION.
Upon generation of downlink transmission data in step 455, the UTRAN returns
to step 450 to transmit using the dedicated data channel and the dedicated control

channel.
Because the UTRAN is responsible for control of gated transmission, the
UTRAN determines gated transmission parameters including a gated transmission
rate, a gated transmission time period, a gated transmission pattern, and a power
increment for a dedicated data channel (DPDCH) in case of generation of
transmission data during gated transmission in step 456, prior to transmission of
the gated transmission command message in step 457. Information fields of the
gated transmission command message are shown in FIG. 10.
If the UTRAN receives information about the current radio environment
and gated transmission-related information in a procedure shown in FIG. 9 from
the UE(MS) in step 456 of FIG. 4B, it aids in determining the gated transmission
parameters. In the embodiment of the present invention, the UTRAN retransmits
the gated transmission command message when it fails to receive the response
message from the UE(MS) in step 458. Yet, if the UE(MS) provides information
about an operation for the case of non-response transmission, the UTRAN
operates based on the information.
In step 459 of FIG. 4B, the UTRAN initiates gated transmission of a
downlink dedicated control channel. If the UTRAN judges from a received
uplink dedicated control channel that the downlink dedicated data channel can be
maintained at a reduced gated transmission rate, it orders the UE(MS) to modify
the gated transmission. The gated transmission modification can also be
requested if the UTRAN determines that it is difficult to maintain the dedicated
data channel at a current gated transmission rate. A gated transmission
modification command message should include information about when to start a
modified gated transmission. The UE(MS) initiates gated transmission in step
408 of FIG. 4A. Upon receipt of the gated transmission modification command
message from the UTRAN in this state, the UE(MS) should make a modification
to the gated transmission at the time designated in the message.
FIG. 7B is a diagram of transmitted and received signals of a UTRAN
when gated transmission is performed at a gating rate of 1/3 due to the absence of

data on a downlink dedicated data channel and uplink DPDCH signal during
downlink data transmission according to the embodiment of the present invention.
In FIG. 7B, the downlink and uplink dedicated data channel is not transmitted for
a period 760, which is checked in step 453 of FIG. 4B. A period 770 is set in the
gated transmission command message transmitted in step 457 of FIG. 4B. A
period 780 is also set in the gated transmission command message. Fig. 7B is the
embodiment of gating rate 1/3 transmission.
FIG. 5A is a flowchart illustrating an UE(MS) operation when uplink
transmission data is generated during gated transmission of a uplink dedicated
control channel according to the embodiment of the present invention.
Referring to FIG. 5A, gated transmission of the dedicated control channel
is in progress in step 500. To compensate for the decrease of a power control
cycle in transmitting a dedicated data channel during the gated transmission, the
transmission power of the dedicated data channel is increased. In this case,
signaling data and traffic data are transmitted as long as the traffic data is so small
that the increased power-caused interference is less than a capacity increase that
gated transmission brings about. In step 501, it is checked whether transmission
data is generated. If so, the process proceeds to step 502. If not, the process
proceeds to step 500. In step 502, the UE(MS) determines whether transmission
data is signaling or traffic data. If it is signaling data, it is always transmitted in
step 503 because the signaling data is small. On the other hand, if it is traffic
data, the UE(MS) checks the size of the traffic data in step 504 and transmits it
during the gated transmission if it is small in step 505.
If the traffic data is large, the UE(MS) transmits a message indicating that
a gated transmission stop condition has been satisfied in step 506 and determines
whether a response message has been received from the UTRAN in step 507. If
the UE(MS) fails to receive the response message, the UE(MS) retransmits the
above message in accordance with the embodiment of the present invention.
The response message should include information about radio resources to be
used and a time point to use them. The UE(MS) starts to transmit data on the
dedicated data channel at the designated time. If data is to be transmitted during

the gated transmission as in steps 503 and 505, the dedicated control channel
can be transmitted in a gated mode or in a continuous transmission mode to
increase the decoding efficiency of a receiver in the second party. Also for the
period between step 506 and step 507, the dedicated control channel can be
transmitted in the gated mode or in the continuous transmission mode. An
UMTS-defined message, MEASUREMENT REPORT can be used as the
message indicating that a gated transmission stop condition is satisfied.
FIG. 8A is a diagram of transmitted and received signals of an UE(MS)
upon generation of uplink transmission data during gated transmission of a uplink
dedicated control channel according to the embodiment of the present invention.
Referring to FIG. 8A, a time when a message indicating that the condition
of stopping gated transmission has been satisfied for a period 800 is transmitted
should satisfy step504 of FIG. 5A. In a period 810, the UE(MS) receives the
response message from the UTRAN and waits until the time designated in the
response message. When the message for the period 800 is transmitted, the
dedicated control channel is transmitted in a continuous transmission mode, but it
can be a gated transmission mode is available. Similarly, the dedicated control
channel is shown to be transmitted continuously for the period 810, but it can be
maintained in the gated transmission mode.
FIG. 5B is a flowchart illustrating a UTRAN operation when downlink
transmission data is generated during gated transmission of a downlink dedicated
control channel according to the embodiment of the present invention.
Referring to FIG. 5B, steps 551, 552 and 554 perform the same functions
as steps 501, 502 and 504 of FIG. 5A. The UTRAN transmits a gated
transmission stop message including information about radio resources to be used
and a time point to use them, taking account of the amount of downlink data to
transmit. When the UTRAN transmits the gated transmission stop message in
step 556, it can transmit the control data on dedicated control channel in a gated
transmission mode or in a continuous transmission mode. Also for the period
between step 556 and step 557, the control data on dedicated control channel

can be transmitted in the gated mode or in the continuous transmission mode.
While the UTRAN retransmits the gated transmission stop message when it has
not received a response message from the UE(MS) in accordance with the
embodiment of the present invention, a different approach can be taken. The
UTRAN waits until a time designated in the gated transmission stop message in
step 558.
FIG. 8B is a diagram of transmitted and received signals of a UTRAN
upon generation of downlink transmission data during gated transmission of a
downlink dedicated control channel according to the embodiment of the present
invention.
Referring to FIG. 8B, though the dedicated control channel is
continuously transmitted for periods 850 and 860, it can also be transmitted in a
gated mode. The period 860 is set in the gated transmission stop message as
indicated by 850.
Continuous transmission of a dedicated control channel, even in the
absence of transmission data enables a dedicated data channel to be maintained in
a stable manner and transmitted at any time. Despite these advantages, the
resulting increase of uplink interference reduces uplink capacity. Power
consumption in an UE(MS) is also increased, thereby reducing time available to
the UE(MS). In addition, continuous transmission of a downlink dedicated
control channel increases downlink interference and decreases downlink capacity.
The present invention implements gated transmission of dedicated control
channels in order to overcome the problems associated with the conventional
methods.
While the invention has been shown and described with reference to a
certain preferred embodiment thereof, it will be understood by those skilled in the
art that various changes in form and details may be made therein without
departing from the spirit and scope of the invention as defined by the appended
claims.

We Claim
1. The method for gated transmission of a dedicated control channel signal
for a base station in a W-CDMA communication system in which a
dedicated control channel and a dedicated data channel for transmitting
packet data are multiplexed prior to transmission, the dedicated control
channel having 15 slots in one frame and each slot including a TFCI bit, a
TPC bit, and a pilot bit, the method comprising the steps of:
transmitting a gated transmission command message including a gating
rate and a gated transmission start time for gated transmission of the
dedicated control channel signal to a mobile station, if no data exists on
the dedicated data channel for a predetermined period of time (step 457);
and transmitting the dedicated control channel signal discontinuously
at the gated transmission start time set in the gated transmission
command message (step 459).
2. The method of claim 1, wherein the base station determines the gating rate
during a call set-up in agreement with the mobile station.
3. The method of claim 1, wherein the base station determines the gating rate
according to channel status when gated transmission is necessary.
4. The method of claim 1, wherein the gated transmission command message
further comprises a power increment field by which to increase the
transmission power of the dedicated data channel signal when data is to be
transmitted on the dedicated data channel during the gated transmission of
the dedicated control channel signal.

5. The method of claim 4, wherein signaling data is transmitted on the
dedicated data channel during the gated transmission of the dedicated
control channel signal.
6. The method of claim 4, wherein predetermined small size traffic data is
transmitted on the dedicated data channel during the gated transmission of
the dedicated control channel signal.
7. The method of claim 1, wherein slots of the dedicated control channel frame
are partially transmitted at the gated transmission of the dedicated control
channel signal.
8. The method for gated transmission of a dedicated control channel signal for a
mobile station in a W-CDMA communication system in which a dedicated
control channel signal and a dedicated data channel for transmitting packet
data are transmitted, the dedicated control channel having 15 slots in one
frame and each slot including a TPCI bit, a TPC bit, and a pilot bit, the
method comprising the steps of:
transmitting a gated transmission request message to a base station if no
data exists on the dedicated data channel for a predetermined period of time
(step 406);
receiving a gated transmission command message including a gating rate and
a gated transmission start time for gated transmission of the dedicated
control channel from the base station (step 407); and
transmitting the dedicated control channel signal discontinuously at the gated
transmission start time set in the gated transmission command message
(step 409).

9. The method of transmitting a dedicated control channel signal for a base
station in a W-CDMA communication system in which a dedicated control
channel, which has 15 slots in one frame each slot including a TFCI bit, a TPC
bit, and a pilot bit, is transmitted discontinuously, the method comprising the
steps of:
transmitting a gated transmission stop message to a mobile station upon
generation of traffic data which is larger than predetermined size during the
gated transmission of the dedicated control channel signal (step 556);
stopping the gated transmission of the dedicated control channel signal at a
time designated in the gated transmission stop message (step 558); and
transmitting the traffic data on a dedicated data channel with continuous
transmission of dedicated control channel signal (step 558).
10.The method of transmitting a dedicated control channel signal for a base
station in a W-CDMA communication system in which a dedicated control
channel signal, which has 15 slots in one frame each slot including a TFCZ, a
TPC bit, and a pilot, is transmitted discontinuously, the method comprising
the steps of:
transmitting traffic data with the full rate transmission of the dedicated
control channel signal upon generation of the traffic data during the gated
transmission mode of the dedicated control channel signal if the traffic data is
a predetermined size or smaller;
transmitting a gated transmission stop message to a mobile station if the
traffic data is above the predetermined size (step 556);
stopping the gated transmission at a time designated in the gated
transmission stop message (step 558); and
transmitting the traffic data on a dedicated data channel with continuous
transmission of dedicated control channel signal (step 558).

11.The method of claim 10, wherein the predetermined size of traffic data
transmittable on the dedicated data channel during the gated transmission
of the dedicated control channel is 10ms.
12. The method of transmitting a dedicated control channel signal for a
mobile station in a W-CDMA communication system in which a dedicated
control channel signal, which has 15 slots in one frame each slot including
TFCI, a TPC bits, and a pilot, is transmitted in a gated mode, the method
comprising the steps of:
transmitting signaling data with the gated transmission of the dedicated
control channel signal if the signaling data is generated during the gated
transmission of the dedicated control channel signal (step 503);
transmitting a gated transmission stop request message to a base station
upon generation of traffic data during the gated transmission of the dedicated
control channel signal (step 506);
stopping the gated transmission at a time designated in a gated transmission
stop message upon receipt of the gated transmission stop message from the
base station (step 508); and
transmitting the traffic data on a dedicated data channel with continuous
transmission of dedicated control channel signal (step 508).
13. The method of transmitting a dedicated control channel signal for a mobile
station in a W-CDMA communication system in which a dedicated control
channel, which has 15 slots in one frame each slot including a TFCI, a TPC, and
a pilot, is transmitted in a gated mode, the method comprising the steps of:
transmitting traffic data with the gated transmission of the dedicated control
channel signal upon generation of the traffic data during the gated transmission

transmitting a gated transmission stop request message to a base station if the
traffic data is above the predetermined size (step 506);
stopping the gated transmission at a time designated in a gated transmission
stop message upon receipt of the gated transmission stop message (step 508);
and transmitting the traffic data on a dedicated data channel with continuous
transmission of dedicated control channel signal (step 508).
A method for gated transmission of a dedicated control channel
signal for a base station in a M-CDHA communication system in
which a dedicated control channel and a dedicated data channel
for transmitting packet data are Multiplexed prior to
transmission, the dedicated control channel having 15 slots in
one frame and each slot comprising a TFCI bit, a TPC bit, and a
pilot bit, the method comprising the steps of transmitting a
gated transmission command message including a gating rate and a
gated transmission start time for gated transmission of the
dedicated control channel signal to a mobile station, if no data
exists on the dedicated data channel for a predetermined period
of time; and transmitting the dedicated control channel signal
discontinuously at the gated transmission start time set in the
gated transmission command message.

Documents:

IN-PCT-2000-623-KOL-FORM-27.pdf

in-pct-2000-623-kol-granted-abstract.pdf

in-pct-2000-623-kol-granted-claims.pdf

in-pct-2000-623-kol-granted-correspondence.pdf

in-pct-2000-623-kol-granted-description (complete).pdf

in-pct-2000-623-kol-granted-drawings.pdf

in-pct-2000-623-kol-granted-examination report.pdf

in-pct-2000-623-kol-granted-form 1.pdf

in-pct-2000-623-kol-granted-form 18.pdf

in-pct-2000-623-kol-granted-form 3.pdf

in-pct-2000-623-kol-granted-form 5.pdf

in-pct-2000-623-kol-granted-gpa.pdf

in-pct-2000-623-kol-granted-priority document.pdf

in-pct-2000-623-kol-granted-reply to examination report.pdf

in-pct-2000-623-kol-granted-specification.pdf

in-pct-2000-623-kol-granted-translated copy of priority document.pdf


Patent Number 213785
Indian Patent Application Number IN/PCT/2000/623/KOL
PG Journal Number 03/2008
Publication Date 18-Jan-2008
Grant Date 16-Jan-2008
Date of Filing 12-Dec-2000
Name of Patentee SAMSUNG ELECTRONICS CO. LTD.
Applicant Address 416 MAETAN-DONG, PALDAL-GU, SUWON-SHI, KYUNGKI-DO 442-370
Inventors:
# Inventor's Name Inventor's Address
1 MUN, HYUN-JUNG 37-1 TONOMG-DONG, NAMYANGJU-SHI, KYONGGI-DO 472-100
2 KIM, KYOU-WOONG CHONGMYONGMAEUL BYOKSAN, APT. NO. 332-902, YOUNGTONG-DONG, PALTAL-GU, SUWON-SHI, KYONGGI-DO 442-470
PCT International Classification Number H 04 B 1/69
PCT International Application Number PCT/KR00/00344
PCT International Filing date 2000-04-12
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 1999-13611 1999-04-12 Republic of Korea