Title of Invention

"A METHOD FOR TRANSMITTING USER DATA COMMUNICATION SYSTEM"

Abstract A method for transmitting user data in a mobile communication system having at least one state transition, said at least one stats transition including transitioning from an active state where user data is transmitted via a dedicated channel to a control hold state when user data is sot generated for a first predefined time in the active state to transmit only control information via a dedicated control channel, said method comprising the steps of: releasing the dedicated control channel and transitioning to a suspended state when the user data to be transmitted is not generated for a second predefined time in the control hold state; determining a parameter value specifying an attribute of the generated user data and comparing the parameter value with a predefined reference value when the user data to be transmitted is generated in the suspended state; and transmitting the user data via a common channel when the parameter value is lower than the predefined reference value.
Full Text This application claims priority to an application entitled 'Data Transmission Method in Mobile Communication System" filed in the Korean Industrial Property Office on April 14, 1998 and assigned Serial No. 98-14274, the contents of which are hereby incorporaled by reference
BACKGROUND
1 Field of the Invention
The present invention relates generally to a mobile communication system, and in particular, to a packet data communication method for a CDMA communication system 2. Description of the Related Art
Code division multiple access (CDMA) mobile communication systems are based on the IS-95 standard which mainly supports voice service. In the near future, mobile communications will be performed in accordance with the IMT-2000 (International Mobile Telecommunication-2000) standard The IMT 2000 standard provides not only voice service but also high speed packet service. FOT example, the IMT-2000 standard supports high quality voice service, moving picture service, Internet search service, etc. The CDMA mobile communication system includes a forward link for transmitting a signal from a base station (BS) to a mobile station (MS) and a reverse link for trnsimitting a Signal from the mobile station to the base station
During the packet service, an exiiting CDMA mobile communication system generates packet data at a burst and frequently repeats a dormant slate where data is not transmitted
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Accordingly, It is anticipated that a mobile communication system in the near future would connect a channel only whan there is data to transmit That is, taking into consideration limited radio resources, capacity of the base station and power consumption of the mobile station, the base station releases the channel when there is no data to transmit, in order to secure the channel for communication with the another mobile station, and then quickly reconnects the channel when there is data to transmit. A conventional method for transmitting packet data is illustrated in FIG. 1.
Channels used in the CDMA mobile communication system are classified into physical channels and logical channels. The logical channels are established in an upper layer of the physical channels, and several logical channels can be established for one physical channel Upon relese of a physical channel, the logical channels established for the released physical channel are automatically released. For establishing a logical channel, establishing a physical channel is not always necessary. For example, in the case where a physical channel to be established for a logical channel has already been established for another logical channel, a required operation is to simply assign the logical channel to the established physical channel The physical channels can be classified into dedicated channels and common channels according to features. The dedicated channels are exclusively used for communication between the base station and the mobile station, and include a fundamental channel (FC.H), a dedicated control channel (DCCH) and a supplemental channel (SCH) The fundamental channel is used for transmitting voice signals, data and signaling messages The dedicated control channel is used for transmitting data and signaling messages. The dedicated control channel supports a discontinuous transmission (DTX) mode for transmitting data only when there is data to transmit, generated from the upper layer. For such a feature, the dedicated control channel is suitable for a control channel established to provide an efficient packet service The
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supplemental channel is used for transmitting a great quantity of data, and is compatible with the IS-95B standard.
In addition, the physical channels include the common channels which are used In common between one base station and multiple mobile stations. A physical common channel for the forward link for transmitting s signal from the base station to the mobile station is called paging channel, end a physical common channel for the reverie link for transmitting a signal from the mobile station to the base station it called an access channel These common channels are also compatible with the IS-95B standard.
The common logical channels established in the upper layer of the common physical channels are classified into a dedicated signaling channel (dsch) and a dedicated traffic channel (dtch) The dedicated signaling channel can be assigned to the fundamental channel and the dedicated control channel, which arc both physical channels. The dedicated traffic channel can be assigned to the fundamental channel, the dedicated control channel and the supplemental channel. As can be hinted from the names, the dedicated signaling channel is used for exchanging a control signal between the bate station and the mobile station, and the dedicated traffic channel la used for exchanging user data between the base station and the mobile station. For the forward link, the common logical channels are established in the upper layer of the paging channel, for the reverse link, the common logical channels are established in the upper layer of the access channel.
FIG 1 is a diagram illustrating state transitions of a data service entity in a CDMA mobile communication system. FIG. 2 is a diagram illustrating stale transitions between subatetes of the data service entity which occur when data to be transmitted is generated in a suspended state 150 of FIG 1.
When the data ia generated in the suspended state 150, the state transitions occur
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equally in the base station and the mobile station. For simplicity, a party transmitting the data will be referred to as a transmission party and a party receiving the data as a reception party
Referring to FIG. 1, In a packet null state 110, the base station and the mobile station are powered up and wait for ft data service request to be received from the other parly. When a packet service request is received in this packet null state 110, a trasmition from the packet null state 110 to an initialisation state 120 takes place.
In the initialization state 120, forward and reverse control channels required for data transmission are established. Here, for the dedicated physical channel, the ftindamenta! channel or the dedicated control channel is established; for the logical channel, the dedicated signaling channel, which is a logical channel between the base station and the mobile station, is established in the upper layer of the fundamental channel or the dedicated control channel Upon establishment of the dedicated signaling channel, the base station negotiates with the mobile station about specification of a service to be provided, A service specification determined through such a negotiation is referred to as a "service option". After negotiation for the service option, a data service entity establishes a dedicated traffic channel required tor transmitting user data and then, transitions to an active slate 140, However, upon failure of the initialization process, the data service entity transitions back to the packet null state 110
In the active state 140, the data trasmmitted using the dedicated traffic channel When the data service entity can use the dedicated control channel in the active state after setting the service option, the base station and the mobile station perform RLP (Radio Link Protocol) and PPP (Point-to-point Protocol) initiaiization processes. When there is no data to be transmitted for a predefined time T in the active state 140, a transition from the active state HO to a control hold state 130 occurs, releasing the dedicated traffic channel Here, a quantity of data to be generated henceforth is expected; if it is judged that the data to be transmitted will not
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be generated for a long time, a transition can take place to a suspended state 150 or a dormant state 160 directly, without passing through the control hold state 130
In the control hold state 130, the service option, RLP-related information and PPP-
related Information arc preserved in the base station and the mobile station, and the dedicated
signaling channel is established. In this state, if data to be transmitted is generated again within
a predefined time T hold the data service entity establishes the dedicated traffic channel and then
transitions back to the active state 140 in order to transmit the generated data. However, if data
is not generated within the time THOLD, the data service entity releases the dedicated control
channel and then transitions to the suspended state 150. Even in this case, a quantity of data
to be generated henceforth is expected; if it is judged that the data to be transmitted will not
be generated for a long time, it is possible to directly transition to the dormant state 160,
without passing through the suspended state 150,
In the suspended sete 150, the fundamental channel or the dedicated control channel, which is a physical channel assigned to the mobile station, is released and the corresponding logical channels, i.e, the dedicated signaling channel and the dedicated traffic channel are also released In this state, communication with a base station is performed using the common signaling channel established for the paging channel and the access channel, which are physical channels being shared by multiple mobile stations. However, in the suspended state 150, the service Option, the RLP-related information and the PPP-related information are still maintained in the base station and the mobile station. When user data to be transmitted is generated again within a predefined time T in the suspended state 150, the dedicated control channel and the dedicated traffic channel are simultaneously established and a transition back to the active state 140 occurs, However, if data is not generated for the time T ^^a, a transition to the dormant state 160 takes place.
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In the dormant state 160, only a point-to-point protocol (PPP) for the data service is open and all other call-related information disappears. Even in the dormant state 160. if it is necessary to transmit data again within a predefined time T_t mmt a transition to the active state 140 occurs after assignment of the dedicated signaling channel. However, when data to be transmitted is not generated within the predefined tima T, even the PPP information is released and then a transition to the packet null state 110 takes place.
Referring to FIG 2, the suspended it state 150 includes a virtual traffic substate 153 and a slotted substate 156. Both in the virtual traffic substate 1 53 and the slotted substate 156 of The suspended state 150, the service Option and the RLP information are maintained in the base station and the mobile station. A transition to the virtual traffic subsute 153 of the suspended state 150 takes place, in the caw where data to be transmitted is not generated within the time T M4 in the control hold state 130 and a virtual active set needs to be maintained even in the suspended state 150
On the contrary, a transition to alotted substate 1 56 takes place, in the case where data to be transmitted is not generated within the time T hold in the control hold state 130 and the virtual active let does not need to be maintained in the suspended state 150. In the virtual traffic substate 153, the virtual active set is maintained to against prompt asaignment of a traffic channel. Here, the virtual active act is a list in which a strength of the forward pilot channel is recorded, the list being managed smuhancousry in both the base station and the mobile station even in a state where the common channel is in use.
To manage the virtual active set in the virtual traffic subrtate 153. the mobile station measure a strength of the pilot channel transmitted from an adjacent base station, and lends, when the measured strength satisfies a predetermined threshold, a message notifying this condition to the bate station. Upon receipt of the message, the base station sends back an
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acknowledge message to the mobile station. Data for maintaining the virtual active aet is exchanged via forward and reverse common stealing channel I. SV-caok. A virtual traffic timer counts a holding time T of the virtual traffic aubstate 153 and is prepared (or included) in the system. When data to be transmitted is generated within the time T ^^ in the virtual traffic subatate 1 «, a transition to the active state HO tafcea p!ac« in order to transmit the generated data
However, when data to be transmitted is not generated within the time T vvvwl in the virtual traffic substate 153, a transition back to the slotted substafe 156 takes place In (he slotted substate 156, the paging channel bring a physical channel, to which the forward common signaling channel (f-csch) being a logical channel is assigned, is monitored in a slotted mode (or on a time-division basis) for reducing power consumption of the mobile station, and the virtual active set is not maJntalfitd. Similarly, when date to be transmitted is generated within a predefined time T -oBe- in the slotted substate 156, a transition to the active state 140 takes place in order to transmit the generated data. However, when data ia not generated within the time T „, in the slotted substat 156, a transition to the dormant slate 160 takes place fn this procedure, the service option and the RLP information which have been managed to the n« e station and the mobile station ere all released. To restart data transmission in the suspended itate 150, the traffic channel and the control channel should bo reassigned, and a channel renegotiation should be made between the base station and the mobile station. In the renegotiation process, a latency occurs because of the signaling overhead.
7

SUMMARY
It is, therefore, in object of the present invention to provide it method for increasing it channel utilisation efficiency by transmitting data directly vis ¦common traiBc channel, without frflnsitlonlng to an active state where a dedicated traffic channel is used, when data to be transmitted is generated in a suspended slate during a data communication in a CDMA mobile communication system.
It is another object cf the present invention to provide a method for increasing a channel utilization efficiency and a data communication speed, by trtniUloning to a burst sub state upon generation of data in a virtual traffic tub it ate or a llott«d substate, segmenting the generated data by a frame length of a common traffic channel and transmitting the segmented data via the common traffic channel.
It is itiil another object of the present invention to provide a method for increasing a channel utilization efficiency and a data communication speed, hi which a new common traffic channel is defined which can transmit user data via a common channel m a virtual traffic subitate and a dotted substate without defining a separate wbtfate, (he user data is segmented by a frame length of the common traffic channel and the segmented user data ii transmitted vis the common traffic channel.
It Is farther still another object of the present invention to provide a method for increasing a channel utilization efficiency and a data communication speed, in which transmission party includes a virtual traffic sub stale and a slotted aubstate, transitions to a burst substate when data to be transmitted if generated, wgmems the generated data by a frame length of a common traffic channel and then transmits the segmented data via the common traffic channel; a reception party then receives the segmented data via the common traffic channel and miserable the received segmented data
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It is further still Another object of the present invention to provide a method for increasing a channel utilization efficiency and & data communication speed, in which a transmission party includes a virtual traffic substate and a slotted substate where a common traffic channel i$ established, segments data to be transmitted by a fame length of the common traffic channel and then transmits the segmented data via the common traffic channel; a reception party then receives the segmented data via the common traffic channel and reassembles the received segmented data.
In accordance with one aspect of the present invention, when data to be trantmitted is generated in a suspended state, a length of the generated data is compared with a reference length for normal data transmission in an active state. When the generated data is shorter than the reference length, a generation frequency of the data generated in the suspended state is compared with a reference generation frequency for normal data transmission in the active state If the generation frequency of the data generated in the suspended state ia lower than the reference generation frequency, a transition to a burst substate occurs to segment the data by a frame length of a common traffic channel and Chen the segmented data is transmitted via the common traffic channel However, if a burst jubilate does not exist, the segmented data is transmitted via a previously assigned common traffic channel.
In accordance with another aspect of the present invention, when data to be transmitted is generated in a suspended state, a transmission party segments the data into frames having a specified length and transmits the segmented data via a previously established common traffic channel Upon reception of the transmitted segmented frames In the suspended state, a reception party reassembles the received frames and transmits the reassembled frame to an upper layer.
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BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
FIG 1 is a block diagram illustrating state transitions for a data service in a CDMA mobile communication system;
FIG. 2 is a block diagram illustrating state transitions for a data service occurring when data is generated in a suspended state;
FIG 3 is a block diagram illustrating state transitions for a data service occurring when data is generated in a suspended state according to the principles of the present invention,
FIG. 4 is a flow chut illustrating how a transmission party transmit data in a burst substatc of the suspended state according to a first embodiment of the present invention;
FIG 5 is a flow chart illustrating how a reception party receives data in the burst substate of the suspended state according to the first embodiment of the present invention;
FIG 6 is a flow chart illustrating how the transmission party transmits data in the suspended state according to a second embodiment of the present invention; and
FIG. 7 is a flow chart illustrating how the reception party receives data in the suspended state according to the second embodiment of the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
A preferred embodiment of the present invention will be described hereinbelow with reference to the accompanying drawing!. In the following description, well kirown functions or constructions are not described in detail since they would obscure the invention in unnecessary detail
With reference to FIG. 3, there is shown a diagram Illustrating state transitions for a data service in the case where data to be transmitted is generated in the suspended state 150. including a burst subfitate 159 in addition to the existing virtual traffic aubstate 153 and the
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slotted substate 156 according to the present invention.
The suspended state 150 defined the new burst substate 159 in addition to the existing virtual traffic substate 153 and the slotted substate 156. The burst substate 159 is defined to transmit user traffic via a common traffic channel (etch). The virtual traffic substate 153, the slotted substate 156 and the burst substate 159 of the suspended state 150 have their own timers, respectively, end a transition occurs to the active state 140 or the dormant state 160 according to the time counted by tha timers.
In addition, with use of the timers. It is possible to measure generation frequency of user data to be transmitted via the common channel in the respective substates The measured value is stored in a memory, and initialized when a transition from the active state 140 back to the suspended state 150 occurs. For example, when the user data is generated three times for 60 seconds in the suspended state 150, the generation frequency of the user data is 3 user data per minute and this value is stored in the memory. First Embodiment
FIGS. 4 and 5 are diagrams illustrating a data exchanging method in the burst substate of the suspended state according to a first embodiment of the present invention. Reference will be made to a user data exchanging method in the burst sub state with reference to FIGS 3 to 5
Referring to FIG. 4, a description will now be made as to how a transmission party transmits user data. When data transmission is discontinued for the T in the control hold state 130, the transmission party transitions to the slotted substate 156 or tha virtual traffic substate 153 of the suspended state 150, in step 401. The transmission party determines in step 403 whether user data is generatad internally in the slotted substate 156 and the virtual traffic subsute 153 of the suspended State 150 It is possible to
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detect the internally generated data through interrupts occurring internally.
When user data is internally generated in the virtual traffic substate 1 53 or the slotted substate 156 the transmission party determines in step 403 whether a length of the generated user data is shorter than a reference
data length, L, When the length
of the generated user data is shorter than L, the transmission party determine in step 407 whether a generation frequency of the generated user data it lower than a minimum data generation frequency, F, As stated above, the user data generation frequency can be read from the memory which accumulates a user data generation frequency value for a predefined time. When the user data generation frequency is lower than F, the transmission party transitions from the virtual traffic substate 153 or the slotted eubstate 156 to the burst substate 159, in stop 409,
For this transition procedure, in the case where the base station is the transmission party, the base station sends a state transition command message and receives an acknowledge from the mobile station; in the case where the mobile station is the transmission party, the mobile station sends a state transition request message and the base station then sends the state transition command message and receives an acknowledge from the mobile station. The transmission party proceeds to step 411 in the burst substate 159 to segment the user data into frames having an appropriate length to be transmitted via the forward/reverse common control channel. The reason for segmenting the data by the appropriate length is because an excessively long data length decreases data transmission efficiency when data is transmitted via the common channel as in the IS-95 system For example, when the data length is 45 and the frame length which can be optimally transmitted via the common channel is 10, the data is segmented into 5 frames of length 10.
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A typical frame structure is illustrated in Table 1. Table 1
Message Type Continuation Message Flag Message
In Table I, the "message type" bit indicttes whether the frame is a control frame or user frame, and the "continuation message flag" bit indicates whether the, data will be continued in the next frame For example, if the 'continuation message flag" bit is "0" then there is no succeeding menage, otherwise, the "continuation message flag" bit is "1" which indicates that the message will he consecutively received In the next frame.
After segmenting the data into frames in step 411, the transmission party proceed to^ step 413 in the burst substate 159 to determine whether a frame to be transmitted is a last frame. If the frame is not the last frame, the transmission party proceeds to step 415; otherwise, the transmission party proceeds to step 421. In step 415, the transmission parly sets the "continuation message flag" bil to "1" to indicate that the message will be consecutively received in the next frame
In step 421, the transmission party sets the "continuation message flag" bit to "0" to indicate that the present frame is the last fr»me of the generated user data After step 415, the transmission party sets in step 417 the 'message type" bit to indicate that the data frame to be transmitted is a user data frame, and transmits the data frame via the common traffic channel in step 419. Thereafter, the transmission party returns to step 413 to repeat the succeeding steps.
Meanwhile, after step 421, the transmission party proceeds to step 423 to set the "message type" bit to indicate that the data frame to be transmitted is a user data frame, and transmits the data frame via the common traffic channel in step 425. Thereafter, in step 427,
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the transmission party trasmissions back to the previous substate, i.e., the virtual traffic substate I 53 or the slotted substate 156, and then returns to step 401.
In the meantime, when the user data is longer than L in step 405 or when the user date generation frequency is higher than F in step 407, the transmission party transitions to the active state 140 and starts normal data transmission to transmit the user data, in step 408 That is. H transition from the virtual traffic substate 153 or the slotted substate 156 to the active state 140 occurs, establishing the dedicated signaling cfunnd and the dedicated traffic channel In the active state 140, the user data is transmitted via the established dedicated traffic channel When data is not received from the other party (i e., the transmission parly) for a predefined time, the reception party transitions to the virtual traffic substate 153 or the slotted substate 156 of the suspended state 150 and monitors whether the data is generated from the other party. When user data is generated in this state, the reception party transitions to the burst sub state 159 of the suspended state 150 and performs a data receiving procedure (see FIG. 5).
Referring to FIG. 5, in step 501, the reception party transitions to the virtual traffic substate 153 or the slotted substate 156 of the suspended state 150 as in the transmission party In the virtual traffic substate 153 or the slotted substate 156, the reception party proceeds to step 502 to determine whether data is received from the transmission party. Here, the received data is control data to state transmitted
Upon receipt of the control data commanding a state transition, the reception party transitions to the burst substate 159 in Step 503 The recaption party proceeds to step 507 in the burst substate 159 to determine whether user data is received When the user data is received, the reception party proceeds to step 509; otherwise, the reception party returns to step 505 and maintains the burst substate 159. Whether or not the received data is the user data
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can be determined by examining the "message typo bit of the received data frame
In step 509, the reception party determines whether the received frame is 6 self frame belonging to the reception party itself. When the received user data frame is the self frame, the reception party stores the received data in step 511 and proceeds to step 513 to determine whether the received frame is the fast frame, by examining the "continuation message flag" bit If the received frame is not the last frame, the reception party returns to step 505 to repeat the succeeding steps; otherwise, the reception party transmits the stored received data to the upper layer in step 515. After transmitting the received data to the upper layer, the reception party transitions back to the previous substate, i.e.. the virtual traffic substate 153 or the slotted substate 156 In step 517, and then returns to step 501 Second embodiment
In the second embodiment, the common traffic channel being a logical channel in established in (he virtual traffic substate 1 S3 and the slotted substate 156 of the suspended state 150, so that user traffic can be transmitted in the respective substetes of the suspended state, without state transition.
With reference to FIG 6, there is shown a diagram illustrating how the transmission party transmits data according to the second embodiment of the present invention When user data is not generated for a predefined time in the control hold state 130, the transmission party transitions to the virtual traffic tub state 153 of the slotted substate 156 of the suspended state 150, in step 601 .In the virtual traffic substate 153 ot the slotted substate 156, the transmission party determine in step 603 whether user data is generated. When the user data is generated in step 603, the transmission party determines In step 603 whether a length of the generated user data is shorter than a reference data length, L,
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If the length of the generated user data is shotter than L, the transmission party determines in step 607 whether a generation frequency of the user data is lower than a minimum data generation frequency, F, When the user data generation frequency is lower than F, the transmission party segments the user data into frames having art appropriate length to be transmitted via the forward/reverse common channel, in step 609 The reason for segmenting the data by the appropriate length it because an excessvely long data length decreases data transmission efficiency when data is transmitted via the common channel as in the IS-95 system.
After segmenting the data into frames in step 609, the transmission party proceeds to step 611 to determine whether a frame to be transmitted ii a lut frame. If the frame is not the last frame, the transmission party proceeds to step 613, otherwise, the transmission party proceeds to step 619. In step 613, the transmission party sets the "continuation message flag" bit to " 1" to indicate that the message will be conteajtively transmitted in the next frame In the step619, the transmission party sets the "continuation meiaagc flag" bit to "0" to indicate that the present frame is tho last frame of the generated user data
After step 613, the transmission party seta in step 615 the "message type" bit to Indicate that the data frame to be transmitted is user data frame, and transmits the data frame via (he common traffic channel in step 617, Thereafter, the transmission party returns to step 611 to repeat the succeeding steps. Meanwhile, after step 619, the transmission party proceeds to step 621 to set the "message type" bit to indicate that the data frame to be transmitted is a user data frame, and transmits the data frame via the common traffic channel in step 623 Thereafter, in step 623, the transmission party transitions back to the previous substate. i e. the virtual traffic subitate 153 or the slotted substate 156, and then returns to step 601
In the meantime, when the user data is longer than L in step 605 or when the user data
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generation frequency is higher than F in step 607, the transmission party transitions to the active state 140 and starts normal data transmission to transmit the user data, in step 608
FIG. 7 is a diagram illustrating how the reception party receive the uier data irMimitted from the transmission party. Referring to FIG. 7, in step 701, the reception parly transitions to the virtual traffic lubstate 1 S3 or the dotted substtte 156 of the suspended state 150 as m the transmission party In the virtual traffic substate 1 S3 or the slotted substate 156, (he reception party proceeds to step 703 to determine whether user data is received from the transmission party. When the user data is received, the reception party proceeds to step 705; olherwise, when control data Is received, the reception party proceeds to step 704 to process the received control message and then returns to step 701.
In step 705, the reception party determine whether the received frame ii a self frame Monging to the reception party itself. When the received user data frame is the self frame, the reception party stores the received data in a memory in step 707 and proceeds to step 709 to determine whether the received frame is thelaat frame, by examining the "continuation message flag" bit. If the received frame it not the last frame, the reception party returns to step 701 to repeat the succeeding steps and store the received data; otherwise, tho reception party reassembles all the data stored in the memory and transmits the reassembled data to the upper layer in step 711 At ihin manftl a Hug imjicalinf dial the user da To sum up, in the suspended stato, the short and infrequent traffic is transmitted vis the
i common traffic chartnd, thereby increasing a utilization efficiency of the radio resources and
' reducing the transmission time delay. Therefore, the data communication service speed Is
increased.
While the invention has been shown and described with reference to a certain preferred
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embodiment thereof, it will be understood by those skilled in the art that various change in form and details may be made therein without departing from the spirit tnd scope of the invention as defined by the Appended claims.
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WE CLAIM
1. A method for transmitting user data in a mobile communication
system having at least one state transition, said at least one state transition
including transitioning from an active state where user data is transmitted via a
dedicated channel to a control hold state when user data is not generated for a
first predefined time in the active state to transmit only control information via a
dedicated control channel, said method comprising the steps of:
releasing the dedicated control channel and transitioning to a suspended state when the user data to be transmitted is not generated for a second predefined time in the control hold state;
determining a parameter value specifying an attribute of the generated user data and comparing the parameter value with a predefined reference value when the user data to, be transmitted is generated in the suspended state; and
transmitting the user data via a common channel when the parameter value is lower than the predefined reference value.
2. The method as claimed in claim 1, wherein the step of
transitioning to the active state to transmit the user data via the dedicated control
channel when the parameter value is higher than the reference value.
3. The method as claimed in claim 1, wherein the parameter value is
a length of the user data...
4. The method as claimed in claim 1, wherein the parameter value is
a generation frequency of the user data.
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5. The method as claimed in claim 1, wherein the suspended state is
a slotted substate.
6. The method as claimed in claim 1, wherein the suspended state is
a virtual traffic substate.
7. The method as claimed in claim 1, wherein the suspended state
comprises a slotted substate and a burst substate, and the step of releasing the
dedicated control channel and transitioning to the suspended state comprises the
steps of:
transitioning from the control hold state to the slotted substate of the suspended state when the user data is not generated for the second predefined time in the control hold state; and
transitioning from the slotted substate to the burst substate of the suspended state to transmit the user data via the common channel when the parameter value is lower than the reference value.
8. The method as claimed in claim 1, wherein the suspended state
comprises a virtual traffic substate and a burst substate, and the step of releasing
the dedicated control channel and transitioning to the suspended state comprises
the steps of:
transitioning from the control hold state to the virtual traffic substate of the suspended state when the user data is, not generated for the second predefined time in the control hold state; and
transitioning from the virtual traffic substate to the burst substate of the suspended state to transmit the user data via the common channel when the
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parameter value fs lower than the reference value.
9. The method as claimed in claim 1, wherein the common channel is an
access channel.
10. The method as claimed in claim 1, wherein the common channel is a
paging channel.
11. The method as claimed in claim 1, wherein a dedicated channel is
established in the suspended state and a transition to the active state
occurs to transmit the user data via the dedicated channel when the
user data generated in the suspended state is longer in length than the
reference value.
12. A method for receiving user data In a mobile communication system
having at least one state transition, said at least one state transition
Including transltloning from an active state to a control hold state to
receive only control Information via a dedicated control channel when
the user data is not transmitted and received for a first predefined time
in the active state, said method comprising the steps of:
releasing the dedicated control channel and transitloning to a
suspended state to receive the user data via a common channel when
the user data to be transmitted or received is not generated for a
second predefined time in the control hold state; and
receiving the user data in the suspended state and storing the received
data.
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13. The method as claimed in claim 11, wherein the suspended state is a slotted substate.
14. The method as claimed in claim 11, wherein the suspended state is a virtual traffic substate.
15. The method as claimed in claim 11, wherein the suspended state comprises a slotted substate and a burst substate, and the step of releasing the dedicated control channel and transitioning to the suspended state to receive the user data via the common channel comprises the steps of:
transitioning from the control hold state to the slotted substate of the suspended state when the user data is not generated for the second predefined time in the control hold state; and
transitioning from the slotted substate to the burst substate of the suspended state to receive the user data when the user data is received via the common channel in the slotted substate.
16. The method as claimed in claim 11, wherein the suspended state comprises a virtual traffic, substate and a burst substate, and the step of releasing the dedicated control channel and transitioning to the suspended state to receive the user data via the common channel comprises the steps of:
transitioning from the control hold state to the virtual traffic substate when the user data is not generated for the second predefined time in the control hold state; and
transitioning from the virtual traffic substate to the burst substate to
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receive the user date when the user data Is received via the common channel In the virtual traffic substate.
A method for transmitting user data in a mobile communication system having at least one state transition, said at least one stats transition including transitioning from an active state where user data is transmitted via a dedicated channel to a control hold state when user data is sot generated for a first predefined time in the active state to transmit only control information via a dedicated control channel, said method comprising the steps of: releasing the dedicated control channel and transitioning to a suspended state when the user data to be transmitted is not generated for a second predefined time in the control hold state; determining a parameter value specifying an attribute of the generated user data and comparing the parameter value with a predefined reference value when the user data to be transmitted is generated in the suspended state; and transmitting the user data via a common channel when the parameter value is lower than the predefined reference value.

Documents:

00339-cal-1999-abstract.pdf

00339-cal-1999-claims.pdf

00339-cal-1999-correspondence.pdf

00339-cal-1999-description(complete).pdf

00339-cal-1999-drawings.pdf

00339-cal-1999-form-1.pdf

00339-cal-1999-form-18.pdf

00339-cal-1999-form-2.pdf

00339-cal-1999-form-3.pdf

00339-cal-1999-form-5.pdf

00339-cal-1999-g.p.a.pdf

00339-cal-1999-letters patent.pdf

00339-cal-1999-priority document others.pdf

00339-cal-1999-priority document.pdf


Patent Number 202477
Indian Patent Application Number 339/CAL/1999
PG Journal Number 08/2007
Publication Date 23-Feb-2007
Grant Date 23-Feb-2007
Date of Filing 13-Apr-1999
Name of Patentee SAMSUNG ELECTRONICS CO.,LTD.,
Applicant Address 416 ,MAETAN-SONG,PALDAL-GU SUWON-CITY,KYONGKI-DO KOREA
Inventors:
# Inventor's Name Inventor's Address
1 HYUN-SEOK LEE JUGONG APT.,#29-302 ,CHAMSHIL-DONG, SONGPA-GU SEOUL
2 YOUNG -KI KIM SUNGKYUNG APT.,#12-1401,TAECHI-DONG KANGNAM-GU SEOUL
PCT International Classification Number H 04 Q 7/38
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 14274/1998 1998-04-14 Republic of Korea