CN1303203A - Method for synchronizing channel coding blocks - Google Patents
Method for synchronizing channel coding blocks Download PDFInfo
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- CN1303203A CN1303203A CN00100062A CN00100062A CN1303203A CN 1303203 A CN1303203 A CN 1303203A CN 00100062 A CN00100062 A CN 00100062A CN 00100062 A CN00100062 A CN 00100062A CN 1303203 A CN1303203 A CN 1303203A
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Abstract
A method for implementing the block synchronization between channel code unit (CCU) and packet control unit (PCU) in general packet radio service (GPRS) system features that the data block number and data block synchronizing information carried by transmitted code frame (TRAU) between CCU and PCU is used. When the encoded data block n of CCU arrives, the data block n of PCU is received, removing the delay and increasing the utilization rate of radio resources.
Description
The present invention relates to the field of channel coding in the wireless communication system, particularly about a kind of in GPRS (GPRS:General Packet Radio Service) system, realize the synchronous method of piece between chnnel coding unit (CCU) and the GPRS packet control unit (PCU).
Whole communication network just progressively develops towards intelligent, broadband, personalized direction.Along with the continuous development of gsm service, begin to have introduced GPRS (GPRS) in the GSM Phase 2+ stage.GPRS goes up the system that realizes packet transfer mode at public land mobile communication network (PLMN:Public Land MobileNetwork), and GPRS is the data service based on packet switch that GSM Phase 2+ is provided.The GSM/GPRS network can be realized packet data transmission end to end, GPRS can transmit low capacity data discontinuous transmission or that often send, also be suitable for simultaneously the transmission of Large Volume Data, GPRS will provide such as Internet access, ecommerce, transmitting-receiving E-mail, automotive electronics or the like business to people.
GPRS finishes the transmitted in packets function by increase a series of functional entity on former GSM network foundation.GPRS has kept the division to wireless subsystem (BSS) and network subsystem (NSS).For network subsystem, GPRS has increased Serving GPRS Support Node (SGSN) and two functional entitys of Gateway GPRS Support Node (GGSN) newly, and is then public with the GSM circuit-switched service for wireless subsystem.That is to say subsystem, in original support circuit-switched, support transmitted in packets at BSS.Be illustrated in figure 1 as the building-block of logic of GPRS.Logically, in the BSS subsystem, introduced the protocol processes that PCU carries out Packet Service.Fig. 2 specifically provided PCU may the position, wherein BTS is a base station transceiver, BSC site is the base station controller node, GSN site is a GPRS Support Node.Owing to do not have agreement between the interface of chnnel coding unit CCU and GPRS packet control unit PCU, and there is transmission delay between PCU and the CCU, if the method time-delay with the CCU buffer memory will reach 240ms (52 frame), transmission speed and utilization ratio of wireless resources have been influenced.
Purpose of the present invention just is to provide the synchronous method of piece between CCU and the PCU that realizes in a kind of gprs system, with the transmission delay between elimination CCU and the PCU, thereby improves utilization ratio of wireless resources.
Technical scheme of the present invention is achieved in that
A kind ofly realize in the gprs system the synchronous method of piece between the CCU and PCU, it is characterized in that the method includes the steps of:
A. fill out descending number: PCU fills out piece number (block_pcu) the descending transmission code frame (TRAU) to be encoded that sends to CCU from PCU, represents that these frame data send in the data block (block) of this piece correspondence.
B. get PCU piece number: from buffering area, take out when encoding by CCU from the transmission code frame (TRAU) to be encoded of PCU with piece number (block_pcu);
C. calculate CCU piece number: CCU and calculate the piece number (block-ccu) corresponding with current frame number;
D. calculate the piece poor (delta_block) of PCU piece number and CCU piece number: deduct PCU piece number (block_pcu) by CCU piece number (block_ccu), carry out the computing of mould 12 again, the value that makes this piece poor (delta_block) is between 0～11;
E. this piece poor (delta_block) being uploaded to PCU:CCU is carried at this piece poor (delta_block) in the up transmission code frame (TRAU) and sends to PCU;
F.PCU obtains this piece poor (delta_block) in the transmission code frame (TRAU) from CCU that receives;
Piece number (block_re): the PCU that g.PCU calculating maintainance block should be sent out synchronously adds this piece poor (delta_block) value with the descending piece register value (block_re) that will send, and carries out the computing of mould 12;
H.PCU sends this piece register value (block_re) data block (block) pointed.Abandoning of front; Perhaps block of information, promptly block_re is 12 forward.
Above-mentioned step h comprises the data block (block) of abandoning the front, sends this piece register value (block_re) data block (block) pointed; Or send several empty pieces, send this piece register value (block_re) data block (block) pointed again.
The synchronous method of piece between CCU and the PCU among the realization GPRS provided by the present invention, the piece synchronized algorithm that utilizes it to provide, can reach when transmitting CCU coding block n, receive that simultaneously the block from PCU also is block n, original time-delay in the time of can eliminating transmission like this, it is synchronous that block encoding between maintenance CCU and the PCU and piece transmit, thereby improved utilization ratio of wireless resources.
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is the building-block of logic of GPRS.
Fig. 2 is the position view of PCU.
At first, between CCU and PCU, configure coded format and transmission regulation.Comprise defined transmission code (TRAU) frame format between CCU and the PCU, and name by Z_TRAU; Also comprise the regulation that transmits content between the coded format of institute's transmission frame and CCU and the PCU in addition.The form of Z_TRAU is made of 40 bytes, from byte0～byte39; 8 of each bytes are from bit1～bit8.Its definition is such: byte0, bytel are frame head, and its all place values are 0; Byte2, byte3 are control bit, and wherein, the bit1 value of byte2 is 1, represent in proper order by c1～c15 for all the other 15; Byte4～byte39 is a data bit, represents in proper order by d1～d288.
The coded format of Z_TRAU frame and transmission content thereof: in Z_TRAU, descending transmission Rlc/macblock, up transmission Rlc/mac block and packing access burst pulse train (access burst).When up, downlink transfer, c1, c2 represent 4 kinds of encoding scheme: CS-1, CS-2, CS-3 and CS-4, its arrangement mode: being c1c2 when up, is c2c1 when descending; The piece number of 12 piece block0～block11 is represented in the combination of c3～c6, and it is arranged as c6c5c4c3; CCU and the current piece number difference delta_block that will pass piece of PCU are represented in the combination of c7～c10, and it is arranged as c10c9c8c7, and effective value is 0～11; C11 represents normal burst pulse train (normal burst--NB) and access burst pulse train (accessburst--AB) respectively, and the implication of c12～c15 and d1～d288 representative is all inequality under two kinds of different situations.
Represent NB when c11=1, when uplink, c12=1 represents Frame, and c12=0 represents bad frame, i.e. decoding failure; When downlink transfer, c12=1 represents Frame, and c12=0 represents empty frame.C13～c15 represents 8 kinds of qualities of reception in uplink, it is arranged as c15c14c13; Free time during downlink transfer.In uplink, d1～d6 represents received signal intensity, from-110dBm～-48dBm, the d7 free time, when encoding scheme was CS-1, d8～d192 was a data bit, all the other free time; When encoding scheme was CS-2, d8～d279 was a data bit, all the other free time.In downlink transfer, when encoding scheme was CS-1, d1～d184 was a data bit, all the other free time; When encoding scheme was CS-2, d1～d271 was a data bit, all the other free time.
Represent AB when c11=0, when uplink, c12 represents the bit number of Packet Random Access Channel (PRACH), and c12=0 is 8bits, and c12=1 is 10bits; C13～c15 represents the number of the AB of decoding success, and it is arranged as c13c14c15; D1～d160 represents n AB respectively, and d1～d40 represents the 1st AB; D41～d80 represents the 2nd AB; D81～d120 represents the 3rd AB; D121～d160 represents the 4th AB, all the other free time.Wherein, the bit-order of AB is: d1-d16 represents reference value, and wherein d9-16 or d6-d16 are effective, and all the other bits are 1; The d17-d24 express time is leading; D25-d40 represents the sequence number of frame.It is identical when the transmission of c11=0 when downlink transfer stipulated with c11=1.
Of the present invention synchronous implementation procedure is:
1, PCU fills out the piece block_pcu that these frame data send the descending trau frame to be encoded that sends to CCU from PCU, represents these frame data should send on which data block block.
2, CCU takes out from buffering area from the entrained block block_pcu of the above-mentioned trau frame to be encoded of PCU when coding;
3, CCU calculates the block block_ccu corresponding with current frame number;
4, CCU calculate current block number with block number poor delta_block=block_ccu_block_pcu from PCU, and carry out the computing of mould 12, the value that makes delta_block is between 0～11;
5, CCU carries this delta_block in the trau frame of up transmission PCU;
6, PCU obtains this delta_block when the up trau frame that receives;
7, PCU adds this delta_block with the transmission piece register value Block_re of descending transmission, and touches 12 computings:
Block_re=Block_re+delta_block，
Block_re=Block_re?mod?12；
8, PCU sends the block of Block_re indication, and the block of front abandons, and perhaps sends several empty pieces, sends block of information again, and promptly Block_re is 12 forward.
Above-mentioned block number (Blocknumber:c3～c6) carries transmission, and (piece is synchronous: c7～c10) carries transmission to piece number difference delta_block with the 8th to the 11st of control bit with the 4th to the 7th of control bit in transmission code (TRAU) frame.
Example as shown in the table, this table will send the formation of piece for PCU.Wherein n is empty piece, and f is a block of information; Sequence number is the logical block value, and piece number is a sequence number mould 12.The current value that sends Block_re in the block register at PCU is 4, if through calculating delta_block=3, then can calculate the Block_re=7 that should send; Can find from formation so needs to send the 19th locational block 7, then should abandon block 4,5,6; Perhaps carry previous round, directly send the 7th locational block of information block.
| Content | ??n | ??n | ??n | ??N | ??n | ??n | ?n | ??n | ??n | ??n | ??n | ??n | ??n | ??n | ??n | ??N | ??f | ??f | ??f | ??f | ??f |
| Piece number | ??0 | ??1 | ??2 | ??3 | ??4 | ??5 | ??6 | ??7 | ??8 | ??9 | ??10 | ??11 | ??0 | ??1 | ??2 | ??3 | ??4 | ??5 | ??6 | ??7 | ??8 |
| Sequence number | ??0 | ??1 | ??2 | ??3 | ??4 | ??5 | ??6 | ??7 | ??8 | ??9 | ??10 | ??11 | ??12 | ??13 | ??14 | ??15 | ??16 | ??17 | ??18 | ??19 | ??20 |
Claims (3)
1, a kind ofly in gprs system, realize the synchronous method of channel coding blocks between CCU and the PCU, it is characterized in that the method includes the steps of:
A. fill out descending number: PCU fills out piece number (block_pcu) the descending transmission code frame (TRAU) to be encoded that sends to CCU from PCU, represents that these frame data send in the data block (block) of this piece correspondence.
B. get PCU piece number: from buffering area, take out when encoding by CCU from the transmission code frame (TRAU) to be encoded of PCU with piece number (block_pcu);
C. calculate CCU piece number: CCU and calculate the piece number (block_ccu) corresponding with current frame number;
D. calculate the piece poor (delta_block) of PCU piece number and CCU piece number: deduct PCU piece number (block_pcu) by CCU piece number (block_ccu), carry out the computing of mould 12 again, the value that makes this piece poor (delta_block) is between 0～11;
E. this piece poor (delta_block) being uploaded to PCU:CCU is carried at this piece poor (delta_block) in the up transmission code frame (TRAU) and sends to PCU;
F.PCU obtains this piece poor (delta_block) in the transmission code frame (TRAU) from CCU that receives;
Piece number (block_re): the PCU that g.PCU calculating maintainance block should be sent out synchronously adds this piece poor (delta_block) value with the descending piece register value (block_re) that will send, and carries out the computing of mould 12;
H.PCU sends this piece register value (block_re) data block (block) pointed.Abandoning of front; Perhaps block of information, promptly block_re is 12 forward.
2, the synchronous method of realization channel coding blocks according to claim 1 is characterized in that: described step h comprises the data block (block) of abandoning the front, sends this piece register value (blockre) data block (block) pointed.
3, the synchronous method of realization channel coding blocks according to claim 1 is characterized in that: described step h comprises the several empty pieces of transmission, sends this piece register value (block_re) data block (block) pointed again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001000624A CN1142665C (en) | 2000-01-03 | 2000-01-03 | Method for synchronizing channel coding blocks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001000624A CN1142665C (en) | 2000-01-03 | 2000-01-03 | Method for synchronizing channel coding blocks |
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| CN1303203A true CN1303203A (en) | 2001-07-11 |
| CN1142665C CN1142665C (en) | 2004-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB001000624A Expired - Fee Related CN1142665C (en) | 2000-01-03 | 2000-01-03 | Method for synchronizing channel coding blocks |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426876C (en) * | 2001-12-11 | 2008-10-15 | 中兴通讯股份有限公司 | Timed synchronizing method in general block radio business |
| CN100433852C (en) * | 2005-10-13 | 2008-11-12 | 中兴通讯股份有限公司 | Adaptive packet data transmission method for EGDE system |
| CN100455038C (en) * | 2004-03-03 | 2009-01-21 | 华为技术有限公司 | Method of data transmission in enhanced GPRS system |
| CN101039256B (en) * | 2006-03-17 | 2011-08-24 | 中兴通讯股份有限公司 | Method for transmitting sectionally packet control unit frame |
-
2000
- 2000-01-03 CN CNB001000624A patent/CN1142665C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426876C (en) * | 2001-12-11 | 2008-10-15 | 中兴通讯股份有限公司 | Timed synchronizing method in general block radio business |
| CN100455038C (en) * | 2004-03-03 | 2009-01-21 | 华为技术有限公司 | Method of data transmission in enhanced GPRS system |
| CN100433852C (en) * | 2005-10-13 | 2008-11-12 | 中兴通讯股份有限公司 | Adaptive packet data transmission method for EGDE system |
| CN101039256B (en) * | 2006-03-17 | 2011-08-24 | 中兴通讯股份有限公司 | Method for transmitting sectionally packet control unit frame |
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| Publication number | Publication date |
|---|---|
| CN1142665C (en) | 2004-03-17 |
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Granted publication date: 20040317 Termination date: 20170103 |