CN100358269C - Synchronous channel configuration method of six cell base station and system of six cell base station - Google Patents
Synchronous channel configuration method of six cell base station and system of six cell base station Download PDFInfo
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- CN100358269C CN100358269C CNB2004100866975A CN200410086697A CN100358269C CN 100358269 C CN100358269 C CN 100358269C CN B2004100866975 A CNB2004100866975 A CN B2004100866975A CN 200410086697 A CN200410086697 A CN 200410086697A CN 100358269 C CN100358269 C CN 100358269C
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Abstract
The present invention relates to a collocation method of a six-cell base station synchronization channel, which specifically comprises the following steps: corresponding relation between each cell at a base station and a time deviation parameter is established; time deviation parameters of adjacent cells in the corresponding relation are not adjacent; a synchronization code of a cell synchronization channel is determined according to the corresponding relation. The present invention also provides a six-cell base station system of which the structure is that six sectors form single-carrier collocation, and the time deviation parameters of the adjacent cells in the system are not adjacent. The present invention can avoid the collision of primary synchronization codes (PSC) between cells in a multipath environment so as to reduce the influence on a user terminal synchronization process caused by multipath interference. The base station system provided by the present invention has the advantages that the PSCs of the adjacent cells are not adjacent, and thereby, the influence on a synchronization process caused by the multipath interference is reduced when a user terminal carries out a cell search.
Description
Technical field
The present invention relates in the mobile communication system in the base station synchronization channel collocation method and a kind of base station radio system, especially broadband CDMA system the six cell base station wireless system that obtains by the method for the invention in the collocation method of each sub-district synchronizing channel and a kind of broadband CDMA system in the six cell base station of six sector single carrier structure.
Background technology
Wideband Code Division Multiple Access (WCDMA) (WCDMA, Wideband Code Division Multiple Access) communication system adopts asynchronous system, do not need the synchronous of strictness between the base station, behind the mobile terminal-opening, need carry out Cell searching, realize comprising between the portable terminal and the network equipment frequency domain, time domain, sign indicating number territory synchronously.For realizing by synchronizing channel synchronously on the time domain.
Synchronizing channel (SCH, Synchronization Channel) is a down link that is used for Cell searching.SCH comprises two subchannels, primary synchronization channel and from synchronizing channel.Primary synchronization channel and be 10ms from the radio frames length of synchronizing channel is divided into 15 time slots, and the length of each time slot is 2560 chips.Fig. 1 has described the structure of synchronizing channel radio frames.
Primary synchronization channel comprise one long be the modulation code of 256 chips, be called Primary Synchronisation Code (PSC, PrimarySynchronization Code), represent with Cp among Fig. 1, the emission of each time slot of Primary Synchronisation Code once, the PSC of all sub-districts is identical in the system.
From modulation code that 15 sequences are arranged of synchronizing channel repeat its transmission, i.e. Secondary Synchronization Code (SSC, SecondSynchronization Code), each Secondary Synchronization Code length is 256 chips, transmits with the Primary Synchronisation Code in the primary synchronization channel is parallel.SSC Csi in Fig. 1, k represents Secondary Synchronization Code, i=0 wherein, 1 ..., 63 is the sequence number of scrambler code character, k=0, and 1,2 ..., 14 is timeslot number.
In the WCDMA system, Radio Resource has frequency, time, sign indicating number to describe sub-district and channel in totally three territories, and in this system, and a carrier frequency in sector is exactly a sub-district.On the frequency domain, the cell operation of all base stations is on the frequency of same carrier wave; On the sign indicating number territory, different districts is represented different sub-districts by the different scrambler of configuration.On time domain, by the structure of above-mentioned synchronizing channel as can be known, the WCDMA system has stipulated a Primary Synchronisation Code, the Primary Synchronisation Code of the synchronizing channel of all sub-districts (PSC) all is the same, is mainly used in time synchronized, and PSC does not handle through the scrambler scrambling, if all sub-districts adopt unique synchronous code to launch simultaneously, then terminal can't be distinguished the sub-district, therefore on time-domain, has stipulated Primary Synchronisation Code (PSC) so that the regular hour skew is arranged between the different districts.In the system, the parameter of representing this time migration is T_cell.A slot length is 2560 chips in the WCDMA system wireless frame structure, and the synchronizing channel code length in time slot is 256 chips, so parameter T_cell value can be for 0,1 ..., 9, represent 10 different synchronous codes respectively.
In mobile communication system, because there is the multipath phenomenon in the complexity of wireless propagation environment.The multipath interference appears in the synchronizing channel for fear of different districts, must reasonable disposition synchronous channel migration parameter T_cell.If the synchronizing channel time migration of two sub-districts configuration is adjacent, the process radio transmission is many after propagating so, has the Primary Synchronisation Code of a back skew sub-district and the Primary Synchronisation Code overlapping phenomenon of previous skew sub-district.Therefore, the configuration of synchronous channel migration parameter T_cell should guarantee that the synchronous code of the synchronizing channel between the interior different districts in same base station (NodeB) can not be overlapping, otherwise the sub-district can influence starting up of terminal the time is synchronous.Because the distribution of general multi-path environment is less than 128 chips, and code length is 256 chips synchronously, therefore during the configuration of the primary synchronization channel time migration between the same website different districts, as long as it is non-conterminous to satisfy between the sub-district Primary Synchronisation Code, the work operation that just can guarantee system normally.
In the configuration of the synchronizing channel of prior art, if when 3 * 1 configurations are supported in a base station, so during the configuration of the offset parameter of 3 sub-districts as long as guarantee not dispose continuous T_cell parameter, just can avoid the collision of PSC.With reference to the three cell base station synchronizing channel configuration principle figure of Fig. 2, shown in this figure, three sub-districts are chosen non-conterminous time migration parameter respectively and are got final product.
From the above mentioned, time migration parameter T_cell chooses in 0～9 these 10 numerical value only, be used for the configuration of synchronizing channel, sub-district primary synchronization channel configuration simultaneously should be satisfied the discontinuous rule of time migration parameter again, therefore when configuration 6 * 1 base stations, with reference to collocation method of the prior art, can only realize configuration at most to 5 sub-district synchronizing channels.If finish 6 * 1 configurations, in any case it is continuous mutually all can to have a PSC of 3 sub-districts, because the existence of the multi-path environment of radio transmission, the collision of the PSC between the sub-district can not be avoided.User terminal owing to the multipath between the Primary Synchronisation Code that has 3 continuous sub-districts disturbs, influences slot synchronization, thereby influences the operate as normal of WCDMA system when carrying out Cell searching.
Summary of the invention
Technical problem to be solved by this invention provides synchronous channel configuration method of six cell base station, multipath disturbs to time synchronization process influence that the base station system that obtains by this method can reduce user terminal when carrying out Cell searching; Simultaneously, the invention provides a kind of system of six cell base station that adopts this method configuration, this system can make user terminal reduce the influence of multipath interference to time synchronization process when carrying out Cell searching.
For addressing the above problem, the invention provides a kind of synchronous channel configuration method of six cell base station.This method comprises: set up each sub-district, base station and time migration parameter corresponding relation; The time migration parameter of neighbor cell is non-conterminous in this corresponding relation; Determine the synchronous code of sub-district synchronizing channel according to this corresponding relation.
The process of setting up corresponding relation described in the said method is specially: in the access time offset parameter territory three mutual non-conterminous sub-districts in three continuous time migration parameter respective base station; In described time migration parameter field, choose the space and with described three non-conterminous time migration parameters of continuous time migration parameter to its excess-three sub-district in should the base station.The sub-district that this method is set up and the corresponding relation of time migration parameter are: the time migration continuous parameters of three mutual non-conterminous sub-districts in the base station, the time migration parameter space of other three sub-districts, and three not corresponding with described three mutual non-conterminous sub-districts continuous time migration parameters are adjacent.This sub-district and time migration parameter corresponding relation specifically comprise:
Three mutual non-conterminous sub-district time corresponding offset parameters are 0,1,2, and the time migration parameter of three sub-districts is 4,6,8 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 1,2,3, and the time migration parameter of three sub-districts is 5,7,9 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 2,3,4, and the time migration parameter of three sub-districts is 6,8,0 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 3,4,5, and the time migration parameter of three sub-districts is 7,9,1 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 4,5,6, and the time migration parameter of three sub-districts is 8,0,2 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 5,6,7, and the time migration parameter of three sub-districts is 9,1,3 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 6,7,8, and the time migration parameter of three sub-districts is 0,2,4 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 7,8,9, and the time migration parameter of three sub-districts is 1,3,5 in addition.
The present invention also provides a kind of and system of six cell base station.This system is the system of six cell base station that six sectors constitute the single carrier configuration structure, and the time migration parameter of neighbor cell is non-conterminous in the system.
Described in the said method in the system one of non-conterminous mode of neighbor cell time migration parameter be: the time migration continuous parameters of three mutual non-conterminous sub-districts in the system, the time migration parameter space of its excess-three sub-district, and three not corresponding with described three mutual non-conterminous sub-districts continuous time migration parameters are adjacent.
In method of the present invention and the base station system, the corresponding length of described time migration parameter is the synchronous code of 256 chips.
With respect to prior art, the beneficial effect that the present invention brings is: the collocation method of six cell base station synchronizing channel provided by the present invention is compared with original collocation method, can make the time migration parameter between the neighbor cell of base station non-conterminous, and then under multi-path environment, avoid the collision of Primary Synchronisation Code between the sub-district, reduced the influence of multipath interference the user terminal time synchronization process.The present invention also provides a kind of six cell base station wireless system according to this method configuration, thereby this system has the non-conterminous advantage of PSC of base station neighbor cell, thereby make user terminal when carrying out Cell searching, reduced the influence of multipath interference time synchronization process.
Description of drawings
Fig. 1 is synchronizing channel wireless frame structure figure;
Fig. 2 is three cell base station synchronizing channel configuration principle figure;
Fig. 3 is that 6 sub-districts cover schematic diagrames in 6 * 1 base stations that dispose;
Fig. 4 is a synchronous channel configuration method schematic diagram of the present invention;
Fig. 5 is synchronous channel configuration method one embodiment configuration principle figure of the present invention.
Embodiment
The invention provides synchronous channel configuration method of six cell base station and six cell base station wireless system.
With reference to Fig. 3, the General Principle of base station configuration sub-district synchronizing channel is:
1) operation maintenance center generates the corresponding relation of each sub-district, base station and time migration parameter; The allocation plan of one group of sub-district synchronizing channel promptly is provided by operation maintenance center, and the corresponding relation of each sub-district and time migration parameter may be to provide according to the recommended value in the network design in this scheme.Usually in the configuration of base station synchronization channel, behind the corresponding relation of operation maintenance center proposition each sub-district, base station and time migration parameter, whether rationally do not do any judgement for this corresponding relation;
2) radio network controller is judged by each sub-district, base station of operation maintenance center's generation and the reasonability of time migration parameter corresponding relation;
3) when radio network controller judges that described corresponding relation satisfies the configuration requirement of base station synchronization channel, radio network controller disposes the time migration parameter of this base station, promptly in radio network controller, use the pairing synchronous code of this parameter in the synchronizing channel of definite each sub-district, base station, and the configuration of control base station deadline offset parameter.
Method described in the present invention has solved the technical problem of synchronizing channel configuration according to the mobile communication wireless network network construction characteristic.Fig. 4 is that 6 sub-districts cover schematic diagrames in typical 6 * 1 base stations that dispose, in order to guarantee that mobile communication system provides professional continuity, in the base station institute overlay area, certain overlapping region is arranged, so that user terminal can be realized soft handover when entering into another sub-district by a sub-district in communication between the adjacent sub-district.But in six cell base station, all there is the zone of overlapping covering not all 6 sub-districts, as the sub-district among the figure 1, sub-district 3, sub-district 5 coverage direction differences, and also do not have the zone of overlapping covering; Equally, sub-district 2, sub-district 4, sub-district 6 coverage direction differences, and do not have the zone of overlapping covering.
Obtain by above analysis, because a slot length is 2560 chips in the WCDMA system wireless frame structure, and the interior synchronizing channel code length of time slot is 256 chips, therefore but parameter T_cell span is 10, the span that is T_cell is 0,1, ..., 9, thereby, can satisfy the sub-district of the non-conterminous requirement of neighbor cell time migration parameter and a kind of corresponding relation of time migration parameter is: the time migration continuous parameters that three mutual non-conterminous sub-districts are arranged in the base station, all the other time migration parameter spaces, sub-district, and not adjacent with above-mentioned three continuous time migration parameters.The concrete form of this corresponding relation is:
| Three mutual non-conterminous sub-district time corresponding offset parameters | Three sub-district time corresponding offset parameters in addition |
| 0、 1、 2 | 4、 6、 8 |
| 1、 2、 3 | 5、 7、 9 |
| 2、 3、 4 | 6、 8、 0 |
| 3、 4、 5 | 7、 9、 1 |
| 4、 5、 6 | 8、 0、 2 |
| 5、 6、 7 | 9、 1、 3 |
| 6、 7、 8 | 0、 2、 4 |
| 7、 8、 9 | 1、 3、 5 |
The non-conterminous collocation form of another kind of neighbor cell time migration parameter is:
| 1,3,5 sub-districts order time |
2,4,6 sub-districts order time corresponding offset parameter |
| 0、 1、 2 | 3、 4、 5 |
| 1、 2、 3 | 4、 5、 6 |
| 2、 3、 4 | 5、 6、 7 |
| 3、 4、 5 | 6、 7、 8 |
| 4、 5、 6 | 7、 8、 9 |
| 5、 6、 7 | 8、 9、 0 |
| 6、 7、 8 | 9、 0、 1 |
| 7、 8、 9 | 0、 1、 2 |
In the process of setting up sub-district and time migration parameter corresponding relation, according to 6 * 1 configuration (6 sub-districts, a carrier frequency) difference of each cell coverage area in the base station, realize that a kind of thought of the present invention is: 3 sub-district synchronizing channels that do not have overlapping covering are configured to three continuous offset parameters, the offset parameter of other three cell configuration should guarantee discontinuous, and all non-conterminous with above-mentioned three continuous offset parameters.This thought is embodied in:
1) in continuous three time migration parameter configuration base stations non-conterminous three sub-districts mutually in the access time of the offset parameter territory;
2) in described territory, choose the space and and three of described consecutive hourss between the non-conterminous time migration parameter of offset parameter, dispose the synchronizing channel of all the other sub-districts in this base station.
According to the thought of above six cell base station synchronizing channel configuration, there is the specific implementation of multiple six cell base station synchronizing channel configuration:
Collocation method generality of the present invention is described as:
1) all is non-conterminously divided into one group for a short time, if the base station is 6 * 1 configuration (the single carrier frequency in 6 sub-districts), then there are 6 sub-districts this base station, and these 6 sub-districts can be divided into two groups, first group is: sub-district 1, sub-district 3, sub-district are for 5, the second groups: sub-district 2, sub-district 4, sub-district 6;
2) any three continuous time migration parameters in the time migration parameter field are divided into up duration offset parameter group, promptly from 0,1,2,3,4,5,6,7,8,9, choose three continuous time migration parameters and enough become a parameter group;
Obtain the set of rest parameter in the described territory by described 3 continuous time migration parameter limit, in this set, choose 3 spaces, and all not adjacent with described 3 continuous time migration parameters time migration parameter has constituted another parameter group;
3) choose arbitrary cell set in the parameter group configurating base station, another parameter group disposes another base station cell group, in layoutprocedure,, should dispose to which sub-district for concrete time migration parameter and do not require as long as guaranteeing time migration parameter in the parameter group and sub-district in the cell set that is disposed concerns one to one.
The sub-district offset parameter can be 0 to 9 totally 10 numerical value, so step 2) described in the possible composition form of grouping as shown in the table:
| Continuous 3 parameters | Discontinuous 3 parameters |
| 0、 1、 2 | 4、 6、 8 |
| 1、 2、 3 | 5、 7、 9 |
| 2、 3、 4 | 6、 8、 0 |
| 3、 4、 5 | 7、 9、 1 |
| 4、 5、 6 | 8、 0、 2 |
| 5、 6、 7 | 9、 1、 3 |
| 6、 7、 8 | 0、 2、 4 |
| 7、 8、 9 | 1、 3、 5 |
By mentioned earlier, the present invention realizes in WCDMA wireless access network equipment base station and base station controller.When base station controller is set up the sub-district in connected base station, at the different sub-district time migration parameter of different districts configuration.According to above embodiment, when base station configuration was 6 * 1 modes, base station controller control is implemented in set up 6 sub-districts in the base station.The configuration performing step is as follows:
1) base station controller control base station configuration is set up the sub-district;
2) when numbering the setting up of sub-district 1, T_cell1=0 is set;
3) when numbering the setting up of sub-district 2, T_cell2=4 is set;
4) when numbering the setting up of sub-district 3, T_cell3=1 is set;
5) when numbering the setting up of sub-district 4, T_cell4=6 is set;
6) when numbering the setting up of sub-district 5, T_cell5=2 is set;
7) when numbering the setting up of sub-district 6, T_cell6=8 is set;
8) 6 * 1 cell configuration are finished.
The six cell base station wireless system that the present invention also provides a kind of collocation method of the six cell base station described in according to the present invention to obtain.
This base station radio system is made of six sub-districts, comprises synchronous code in every sub-district, and synchronous CDMA is Primary Synchronisation Code and Secondary Synchronization Code.Each time slot of Primary Synchronisation Code is launched once, and the frequency expansion sequence of 256 identical chips is used in each sub-district in the system; The code length of each Secondary Synchronization Code is 256 chips, and with the different different code character sequences of code word combination sign, having 64 different code characters can use, and Secondary Synchronization Code and Primary Synchronisation Code are parallel to be sent.The all life period skews of the Primary Synchronisation Code of different districts, and the time migration of neighbor cell synchronous code is non-conterminous.Further, in described six cell base station wireless system, the time migration of non-conterminous three sub-districts is continuous mutually in the base station, the time migration space of other three sub-districts, and all not adjacent with described three continuous time migrations.
Because described system is for obtaining according to base station synchronization channel collocation method of the present invention, thereby a kind of optimum way of each sub-district synchronizing channel and time migration corresponding relation is in this system:
| Three mutual non-conterminous sub-district time corresponding offset parameters | Three sub-district time corresponding offset parameters in addition |
| 0、 1、 2 | 4、 6、 8 |
| 1、 2、 3 | 5、 7、 9 |
| 2、 3、 4 | 6、 8、 0 |
| 3、 4、 5 | 7、 9、 1 |
| 4、 5、 6 | 8、 0、 2 |
| 5、 6、 7 | 9、 1、 3 |
| 6、 7、 8 | 0、 2、 4 |
| 7、 8、 9 | 1、 3、 5 |
The another kind of mode of each sub-district synchronizing channel and time migration corresponding relation is in this system:
| 1,3,5 sub-districts order time corresponding offset |
2,4,6 sub-districts order time corresponding offset parameter |
| 0、 1、 2 | 3、 4、 5 |
| 1、 2、 3 | 4、 5、 6 |
| 2、 3、 4 | 5、 6、 7 |
| 3、 4、 5 | 6、 7、 8 |
| 4、 5、 6 | 7、 8、 9 |
| 5、 6、 7 | 8、 9、 0 |
| 6、 7、 8 | 9、 0、 1 |
| 7、 8、 9 | 0、 1、 2 |
More than synchronous channel configuration method of six cell base station provided by the present invention and six cell base station wireless system are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1, sub-district synchronous channel configuration method in a kind of six cell base station of six sector single carrier structure is characterized in that, comprising:
1) sets up each sub-district, base station and time migration parameter corresponding relation; The time migration parameter of neighbor cell is non-conterminous in this corresponding relation;
2) determine the synchronous code of sub-district synchronizing channel according to this corresponding relation.
2, sub-district synchronous channel configuration method in the six cell base station of six sector single carrier structure as claimed in claim 1 is characterized in that, the process of setting up corresponding relation described in the step 1) is specially:
A) three mutual non-conterminous sub-districts in three continuous time migration parameter respective base station in the access time of the offset parameter territory;
B) in described time migration parameter field, choose the space and with described three non-conterminous time migration parameters of continuous time migration parameter to its excess-three sub-district in should the base station.
3, sub-district synchronous channel configuration method in the six cell base station of six sector single carrier structure as claimed in claim 1 or 2 is characterized in that, described corresponding relation is specially:
The time migration continuous parameters of three mutual non-conterminous sub-districts in the base station, the time migration parameter space of other three sub-districts, and three not corresponding with described three mutual non-conterminous sub-districts continuous time migration parameters are adjacent.
4, sub-district synchronous channel configuration method in the six cell base station of six sector single carrier structure as claimed in claim 3 is characterized in that, described corresponding relation is:
Three mutual non-conterminous sub-district time corresponding offset parameters are 0,1,2, and the time migration parameter of three sub-districts is 4,6,8 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 1,2,3, and the time migration parameter of three sub-districts is 5,7,9 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 2,3,4, and the time migration parameter of three sub-districts is 6,8,0 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 3,4,5, and the time migration parameter of three sub-districts is 7,9,1 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 4,5,6, and the time migration parameter of three sub-districts is 8,0,2 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 5,6,7, and the time migration parameter of three sub-districts is 9,1,3 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 6,7,8, and the time migration parameter of three sub-districts is 0,2,4 in addition;
Three mutual non-conterminous sub-district time corresponding offset parameters are 7,8,9, and the time migration parameter of three sub-districts is 1,3,5 in addition.
5, sub-district synchronous channel configuration method in the six cell base station of six sector single carrier structure as claimed in claim 1 or 2, its feature in, the corresponding length of described time migration parameter is the synchronous code of 256 chips.
6, a kind of six cell base station wireless system that obtains according to the described method of claim 1, each base station system is the system of six cell base station that six sectors constitute the single carrier configuration structure, its feature in, the time migration parameter of neighbor cell is non-conterminous in the system.
7, six cell base station wireless system as claimed in claim 6, its feature in, non-conterminous being specially of neighbor cell time migration parameter in the described system: the time migration continuous parameters of three mutual non-conterminous sub-districts in the system, the time migration parameter space of its excess-three sub-district, and three not corresponding with described three mutual non-conterminous sub-districts continuous time migration parameters are adjacent.
8, as claim 6 or 7 described six cell base station wireless systems, its feature in, the corresponding length of described time migration parameter is the synchronous code of 256 chips.
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| CN101998615B (en) * | 2009-08-17 | 2014-06-11 | 中兴通讯股份有限公司 | Synchronization method of auxiliary carrier cells and terminal |
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| CN1320310A (en) * | 1998-09-03 | 2001-10-31 | 西门子公司 | Method and radio communication system for synchronizing subscriber stations |
| WO2001091338A1 (en) * | 2000-05-22 | 2001-11-29 | Qualcomm Incorporated | Method and apparatus for soft handoff in a cdma communication system |
| EP1313337A1 (en) * | 2001-11-15 | 2003-05-21 | Siemens Aktiengesellschaft | Method for transmitting information in a cellular radio communication system comprising sectors |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320310A (en) * | 1998-09-03 | 2001-10-31 | 西门子公司 | Method and radio communication system for synchronizing subscriber stations |
| WO2001091338A1 (en) * | 2000-05-22 | 2001-11-29 | Qualcomm Incorporated | Method and apparatus for soft handoff in a cdma communication system |
| EP1313337A1 (en) * | 2001-11-15 | 2003-05-21 | Siemens Aktiengesellschaft | Method for transmitting information in a cellular radio communication system comprising sectors |
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| Synchronisation in UTRAN Stage2(Release1999). 3rd,Generation,Partnership,Project,TechnicalSpecification,Group,Radio,Access,Network.3GPP TS 25.402 V3.10.0. 2002 * |
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