CN101488833A - Uplink channel encoding method and downlink channel decoding method for TD-SCDMA system - Google Patents
Uplink channel encoding method and downlink channel decoding method for TD-SCDMA system Download PDFInfo
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Abstract
The invention provides an uplink channel coding method and a downlink channel decoding method for TD-SCDMA system. The uplink channel coding method comprises the following steps: A. calculating CCTrCH and parameters used by each TrCH and allocating storage spaces required during the parameter allocation uplink channel coding, after receiving a plurality of TrCH data to be transmitted in a minimum TTI; B. performing CRC check and transmission block cascade for the TrCH data by utilizing the parameters in the TTI corresponding to each TrCH, and performing channel coding for the cascaded data; C. performing one-time interweaving, velocity matching and transmission channel multiple connecting for data channel coded of each TrCH by utilizing the parameters in each 10ms; D. performing bit scrambling, secondary interweaving, and physical channel mapping for the data multiple connected by the transmission channel by utilizing the parameters. According to the technical scheme provided by the invention, the operation is low, the required storage space is small, a high-efficiency processing method is provided for the multiple-service combined mode.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to the up channel coding method and the down channel coding/decoding method of a kind of TD-SCDMA of being used for system.
Background technology
Fig. 1 is the channel coding method flow chart of existing TD SDMA (TD-SCDMA) system.With reference to Fig. 1, the chnnel coding flow process of TD-SCDMA mainly comprises: CRC check, transmission block cascade, code block segmentation, chnnel coding, radio frames equilibrium, once interweave, wireless frame segmentation, rate-matched, transmission channel multiple connection, bit scramble, physical channel segmentation, secondary interweaves, and subframe is cut apart with physical channel and is shone upon.Wherein, the transport service that each transmission channel (TrCH) carrying is different, for the business that delay requirement is arranged, its Transmission Time Interval (TTI) also is different, TTI from set 5ms, 10ms, 20ms, 40ms, among the 80ms} from choosing.For up link, the transmission channel coding process specifically comprises:
(1) the input data in the Transmission Time Interval (TTI) of each transmission channel is divided into a plurality of transmission blocks, and adds the CRC check bit at each transmission block end;
(2) transmission block that will load CRC carries out cascade and code block segmentation;
(3) carry out chnnel coding, coded system is: (a) convolutional encoding is divided into 1/2,1/3 two kind of encoding scheme; (b) the Turbo coding is 1/3 encoding scheme;
(4) the back data of encoding are carried out the radio frames equilibrium, promptly add the redundant bit of certain-length, guarantee to equate through the data length after the wireless frame segmentation;
(5) to data carry out interweaving the first time (being that frame interweaves);
(6) if the TTI of this transmission channel〉10ms, then will carry out wireless frame segmentation;
(7) data of each frame are carried out rate-matched, rate-matched is that the repetition or the punching of bit are provided according to the algorithm that provides in the 3G standard, can be with identical transmitting power emission through the data that guarantee different transmission channels after the rate-matched;
(8) data are through behind the aforesaid operations, and every 10ms forms a coded composite transport channel (CCTrCH) with the data multiplexing of the current wireless frame of each transmission channel together;
(9) carry out bit scramble;
(10) carry out physical channel segmentation;
(11) carry out secondary interweave (intra-frame interleaving);
(12) carry out subframe and cut apart, on the subframe of data mean allocation to 2 5ms after secondary is interweaved;
(13) physical channel mapping, the bit stream of subframe being cut apart output is mapped on the code channel of this subframe time slot.
The channel-decoding flow process of TD-SCDMA roughly is the inverse process of said process, and it mainly comprises: separate the physical channel mapping, subframe merges, separate secondary and interweave, physical channel merges, bit descrambling, transmission channel is separated multiple connection, separates rate-matched, and radio frames merges, separate once and interweave, separate the radio frames equilibrium, channel decoding, encoding block cascade, transmission block is cut apart, CRC check.
In descending process, be that unit receives data with CCTrCH, spread to the factor 16 or 1, and separate the physical channel mapping according to the physical channel mapping ruler; Separate secondary then and interweave operations such as bit descrambling; Carry out transmission channel according to TrCH and separate after the multiple connection, the data of each TrCH are separated rate-matched, go back the data behind the original encoding; After the TTI data of waiting for this TrCH harvest, separate once and interweave, separate the radio frames equilibrium; Carry out channel decoding then; Carry out after the channel decoding that transmission block is cut apart, the CRC check.
Compare with the 2G system, the characteristics of TD-SCDMA maximum are to support the business of number of different types to initiate simultaneously, have therefore designed the uplink transport channel coding method and the descending transmission channel coding/decoding method of the multi-business multiplexing of aforesaid complexity in the TD-SCDMA system.
There is following shortcoming in existing uplink transport channel coding method:
(1) needs very big data buffer area, in uplink transport channel coding/multiple connection process, need: the initial data district, the CRC check data field, transmission block cascade data district, the code block segmentation data field, coded data district, radio frames equalization data district, an interleaving data district, the wireless frame segmentation data field, rate-matched dateout district, transmission channel multiple connection data field, the bit scramble data field, the physical channel segmentation data field, secondary interleaving data district, subframe partition data district, physical channel mapping (enum) data district, totally 15 blocks of data districts;
(2) frequently carry out the operational efficiency that data-moving greatly reduces system.Obviously, also there is same problem in the descending transmission channel decode procedure.
Summary of the invention
Technical problem to be solved by this invention provides the up channel coding method and the down channel coding/decoding method of a kind of TD-SCDMA of being used for system, with the operand that reduces encoding-decoding process and the use of memory space.
For solving the problems of the technologies described above, it is as follows to the invention provides technical scheme:
A kind of up channel coding method that is used for the TD-SCDMA system comprises the steps:
A, in the minimum transfer time interval (TTI), receive the data of a plurality of transmission channels (TrCH) that need to send after, calculation code composite transport channel (CCTrCH) and the used parameter of each TrCH, and according to required memory space in the described parameter distribution up channel cataloged procedure;
B, in the TTI of each TrCH correspondence, utilize described parameter that the data of TrCH are carried out CRC check and transmission block cascade, the data after the cascade are carried out chnnel coding;
C, in every 10ms, the data after utilizing described parameter to the chnnel coding of each TrCH once interweave, rate-matched and transmission channel multiple connection;
D, in every 10ms, the data after utilizing described parameter to the transmission channel multiple connection are carried out bit scramble, secondary interweaves and the physical channel mapping.
Above-mentioned method wherein, comprises the OPADD after each TrCH corresponding transmission channel multiple connection in the described memory space; Among the step C, the mode that adopts the address to move carries out describedly once interweaving, rate-matched and transmission channel multiple connection.
Above-mentioned method wherein, comprises the secondary corresponding OPADD that interweaves in the described memory space; Among the step D, the mode that adopts the address to move is carried out described secondary and is interweaved.
Above-mentioned method wherein, comprises the corresponding OPADD of physical channel mapping in the described memory space; Among the step D, the mode that adopts the address to move is carried out described physical channel mapping.
Above-mentioned method among the step D, adopts the scrambling filter to carry out described bit scramble.
A kind of down channel coding/decoding method that is used for the TD-SCDMA system comprises the steps:
E, in each subframe, receive data, according to data parsing transformat combination indication (TFCI) index that receives according to time-slot sequence;
F, TFCI is deciphered, obtain the transformat of each TrCH, in order to determining the data details of each TrCH, and calculate CCTrCH and the used parameter of each TrCH, according to required memory space in the described parameter allocation of downlink channel-decoding process;
G, in each time slot, utilize described parameter that the reception data of this time slot are separated physical channel mapping;
H, in every 10ms, utilize described parameter to separate to separating frame data after the physical channel mapping that secondary interweaves and bit descrambling;
I, in every 10ms, the data after utilizing described parameter to descrambling are carried out transmission channel and are separated multiple connection, separate rate-matched and conciliate and once interweave;
J, in the TTI of each TrCH correspondence, utilize that described parameter is carried out channel decoding to separating data after once interweaving, transmission block is cut apart and CRC check.
Above-mentioned method wherein, comprises in the described memory space and separates the secondary corresponding OPADD that interweaves; Among the step H, the mode that adopts the address to move is carried out the described secondary of separating and is interweaved.
Above-mentioned method among the step H, adopts the descrambling filter to carry out described bit descrambling.
Above-mentioned method wherein, comprises the OPADD after once interweaving of separating of each TrCH correspondence in the described memory space; Among the step I, the mode that adopts the address to move is carried out described transmission channel and is separated multiple connection, separates rate-matched and conciliate and once interweave.
Technical scheme operand provided by the invention is low, and the memory space that needs is little, for multiple services compound mode provides a kind of processing method efficiently.With the 384k business is that example is added up, and compares with existing coded system and saved 65% on memory space, has saved 51% on MIPS (million instructions per second); Compare with existing decoding process and on memory space, to have saved 57%, on MIPS, saved 53%.
Description of drawings
Fig. 1 is the channel coding method flow chart of existing TD-SCDMA system;
Fig. 2 is the up channel coding method flow chart that is used for the TD-SCDMA system of the embodiment of the invention;
Fig. 3 once interweaves and rate-matched process schematic diagram (TTI=40ms) for prior art;
Fig. 4 is the schematic diagram (TTI=40ms) of step C in the embodiment of the invention;
Fig. 5 is the secondary interleaving process schematic diagram of prior art;
Fig. 6 is a secondary interleaving process schematic diagram among the step D of the embodiment of the invention;
Fig. 7 is the down channel coding/decoding method flow chart that is used for the TD-SCDMA system of the embodiment of the invention;
Fig. 8 separates secondary interleaving process schematic diagram for prior art;
Fig. 9 separates secondary interleaving process schematic diagram among the step H of the embodiment of the invention;
Figure 10 separates a weaving diagram (TTI=40ms) for prior art;
Figure 11 is the schematic diagram (TTI=40ms) of step I in the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
With reference to Fig. 2, the up channel coding method that is used for the TD-SCDMA system of the embodiment of the invention comprises the steps:
A, receive the data that need a plurality of transmission channels (TrCH) of sending in each in minimum transfer time interval (TTI), parameter according to the high level configuration, unified calculation coded composite transport channel (CCTrCH) and the used parameter of each transmission channel (TrCH), and according to required memory space in the described parameter distribution up channel cataloged procedure.
The minimum transfer time interval is meant, need carry out among a plurality of TrCH of multiple connection the TTI of the TrCH correspondence of TTI minimum.Described parameters calculated is the required parameter of using in the whole up channel cataloged procedure, comprise: coded block size, coding back data length, an interleave parameter, parameters of rate matching, the wireless frame segmentation parameter, transmission channel multiple connection parameter, bit scramble parameter, physical channel segmentation parameter, the secondary interleave parameter, physical channel mapping parameters etc.Comprise in the memory space that is distributed: the OPADD after each TrCH corresponding transmission channel multiple connection, the secondary corresponding OPADD that interweaves, the OPADD that the physical channel mapping is corresponding etc.
B, in the TTI of each TrCH correspondence, utilize described parameter that the data of TrCH are carried out CRC check and transmission block cascade, the data after the cascade are carried out chnnel coding.
Coded system is convolutional encoding or Turbo coding.Because encoder for convolution codes and Turbo code encoder can guarantee that the input of encoder can be according to the POS INT coding of any bit, and can be according to the position outputting encoded data of any bit, therefore, can omit the operation that code block is cut apart before encoding, and save the memory space in CRC check data field and the preceding code block partition data district of coding.
C, in every 10ms, the data after utilizing described parameter to the chnnel coding of each TrCH once interweave, rate-matched and transmission channel multiple connection.This step is handled the data of each TrCH in each radio frames.
The radio frames equilibrium is to add some redundant bits to guarantee that the data of every frame equate, because redundant bit is meaningless, have omitted the radio frames equalization step in the present invention behind data bit.Comprise the OPADD after each TrCH corresponding transmission channel multiple connection in the memory space that distributes in steps A, like this, the mode that just can adopt the address to move carries out describedly once interweaving, rate-matched and transmission channel multiple connection, and detailed process sees also hereinafter.Once interweave, rate-matched and transmission channel multiple connection can carry out at the same time, omitted the operation of wireless frame segmentation, and saved radio frames equalization data district, an interleaving data district, the memory space of wireless frame segmentation data field and rate-matched data field.
D, in every 10ms, the data after utilizing described parameter to the transmission channel multiple connection are carried out bit scramble, secondary interweaves and the physical channel mapping.This step is handled the data of current C CTrCH in each radio frames.
Bit scramble can realize that the bit scramble data field can be saved like this by the scrambling filter.Comprise secondary interweave corresponding OPADD and the corresponding OPADD of physical channel mapping in the memory space that in steps A, distributes.Therefore, the mode that can adopt the address to move is carried out described secondary and is interweaved, and so just can omit the operation of physical channel segmentation, and saves the physical channel segmentation data field, and detailed process sees also hereinafter.Subframe is cut apart with physical channel mapping also can move realization by the address, so just can omit the operation that subframe is cut apart.
Describe according to 3G standard, have two physical code channels at most for ascending time slot of UE side.According to the standard to describe method, if there is a physical code channel in current time slots, the dateout that secondary need be interweaved carries out that subframe is cut apart and physical code channel mapping again, outputs to the first subframe physical code channel data field and the second subframe physical code channel data field after the physical channel mapping; If there are two physical code channels in current time slots, the dateout that secondary need be interweaved proportionally outputs to the first subframe physical code channel data field and the second subframe physical code channel data field after each physical channel shines upon.
Among the present invention, if there is a physical code channel in current time slots, data after directly secondary being interweaved output to the first subframe physical code channel data field and the second subframe physical code channel data field after the physical channel mapping, can save the operation time of physical code channel mapping and required data space.
Fig. 3 once interweaves and rate-matched process schematic diagram (TTI=40ms) for prior art.With reference to Fig. 3, according to prior art, need once interweave successively, the rate-matched marking operation, the rate-matched output function needs data space before data space behind two block encodings, the rate-matched and the data space after rate-matched.Like this, very big memory space and computing time have been taken.
Fig. 4 is the schematic diagram (TTI=40ms) of step C in the embodiment of the invention.For the TrCH in the TTI, its data content after through convolutional encoding or Turbo coding is immovable, thus the present invention's mode of adopting the address to move handle once interweave, rate-matched and transmission channel multiple connection.
With reference to Fig. 4, the present invention moves the address with rate-matched and combines, for a TrCH, at first the data after the chnnel coding of this TrCH correspondence are arranged, (5ms is 1 row, and 10ms is 1 row according to TTI data to be lined up the TTI/10 row successively, 20ms is 2 row, 40ms is 4 row, and 80ms is 8 row), described arrangement operation does not need extra memory space.Table 1 is the displacement patterns between row that once interweaves.
| TTI | Columns | Method of replacing between row |
| 5ms
(＊1)， |
1 | <0> |
| |
2 | <0，1> |
| |
4 | <0，2，1，3> |
| |
8 | <0，4，2，6，1，5，3，7> |
Table 1
Under punching (puncture) pattern, can find first symbol of present frame needs permutating column according to table 1, interval T TI/10 symbol takes out symbol successively; According to the parameter of the rate-matched of calculating in the steps A, calculate the E value of this symbol correspondence, according to the positive and negative punch operation of carrying out data symbol of E value; OPADD according to transmission channel multiple connection correspondence in the memory space that distributes in the steps A stores the data symbol after the punch operation in the corresponding memory space into.
Repeating under (repetition) pattern, can find first symbol of present frame needs permutating column according to table 1, interval T TI/10 symbol takes out symbol successively; OPADD according to transmission channel multiple connection correspondence in the memory space that distributes in the steps A stores this symbol in the corresponding memory space into; According to the parameter of the rate-matched of calculating in the steps A, calculate the E value of this symbol correspondence, according to E value positive and negative carry out data symbol repetitive operation; According to the OPADD of transmission channel multiple connection correspondence in the memory space that distributes in the steps A, the symbol of this repetition is stored in the corresponding memory space.
Can once interweave and rate-matched to a plurality of TrCH according to above step, only need the OPADD according to each the TrCH correspondence that calculates in the steps A, the symbol that needs are kept carries out the address and moves.The output memory space that once interweaves and the output memory space of rate-matched have been saved like this.
Fig. 5 is the secondary interleaving process schematic diagram of prior art.With reference to Fig. 5, prior art with the data of input according to 30 data symbol arrangement of every row after, displacement between being listed as according to table 2 is read the memory space that is deposited into after interweaving by row with data symbol then.Displacement patterns between table 2 is listed as for secondary interweaves.
| Columns | Method of replacing between |
| 30 | <0，20，10，5，15，25，3，13，23，8，18，28，1，11，21，6， 16，26，4，14，24，19，9，29，12，2，7，22，27，17> |
Table 2
With reference to Fig. 6, the mode that the present invention adopts the address to move realizes that secondary interweaves.At first calculate through after 30 data symbol arrangement of every row the corresponding data symbol number of every row; The input data that secondary interweaves are arranged,, read these row (this row symbol numbers as calculated) symbol successively according to displacement patterns between being listed as shown in the table 2; With the data symbol that reads, according to the corresponding OPADD that interweaves of secondary in the memory space that distributes in the steps A, discharging successively in corresponding memory space.To every columns certificate, location interval is 30 data symbols between reading of data.According to above step, carried out the operation of displacement between row indirectly, can save the memory space and the computing time of replacing between row.
Adopt above-mentioned up channel coding method, saved CRC check, code block is cut apart before the coding, and the radio frames equilibrium once interweaves, wireless frame segmentation, rate-matched, bit scramble, the memory space that physical channel segmentation, subframe are cut apart.Aspect calculating, adopt the address to move mode, omitted code block and cut apart, radio frames equilibrium, wireless frame segmentation, the computing time that physical channel segmentation and subframe are cut apart.Owing to carrying out all operations at the beginning, just unifiedly calculated the parameter that needs in the process, saved the time that needs to repeat calculation of parameter in the pilot process.
With reference to Fig. 7, the down channel coding/decoding method that is used for the TD-SCDMA system of the embodiment of the invention comprises the steps:
E, in each subframe, receive data, according to data parsing transformat combination indication (TFCI) index that receives according to time-slot sequence.
F, TFCI is deciphered, obtain the transformat of each TrCH, in order to determine the data details of each TrCH, parameter according to the high level configuration, unified calculation CCTrCH and the used parameter of each TrCH, and according to required memory space in the described parameter allocation of downlink channel-decoding process.
TFCI information always is present on the minimum sequence number physical code channel of minimum time slot of a CCTrCH, receives the radio frames of minimum time slot, and TFCI is deciphered, and just can obtain the transformat of transmission channel of the CCTrCH of current transmission.Can carry out Reed-Muller decoding to TFCI, solve the transformat of each TrCH, according to the parameter of high level configuration, unifiedly calculate the CCTrCH and the used parameter of each TrCH that provide by high level then.Described parameters calculated is the required parameter of using in the whole down channel decode procedure, comprise: the decode block size, data length before the decoding is separated interleave parameter one time, separate parameters of rate matching, separate the radio frames balance parameters, radio frames merges parameter, and transmission channel is separated the multiple connection parameter, the bit descrambling parameter, physical channel merges parameter, separates the secondary interleave parameter, separates physical channel mapping parameters etc.Comprise in the memory space that is distributed: separate the corresponding OPADD of physical channel mapping, separate the secondary corresponding OPADD that interweaves, each TrCH correspondence separate OPADD after once interweaving etc.
G, in each time slot, utilize described parameter that the reception data of this time slot are separated physical channel mapping.
If the business of reception is descending multi-slot, separate the physical channel mapping according to 3G standard, need receive all downlink business time slots could operate, and this operation can be wasted the time of several receiving slots.In the present invention, whenever receive a time slot and just separate the physical channel mapping, according to separating the corresponding OPADD of physical channel mapping in the memory space that distributes in the step F, this time slot separated storage after the physical channel mapping in corresponding memory space.Like this, can save the memory space that subframe merges, and utilize other time slots of reception to separate the physical channel mapping, improve treatment effeciency.
H, in every 10ms, utilize described parameter to separate to separating frame data after the physical channel mapping that secondary interweaves and bit descrambling.This step is handled the data of current C CTrCH in each radio frames.
Comprise in the memory space that distributes in step F and separate the secondary corresponding OPADD that interweaves, therefore, the mode that can adopt the address to move is carried out the described secondary of separating and is interweaved, and need not to carry out the physical channel union operation, and saves physical channel merging data district.Adopting the address to move mode carries out the detailed process that secondary interweaves and sees also hereinafter.Bit descrambling can realize that the bit descrambling data field can be saved like this by the descrambling filter.
I, in every 10ms, the data after utilizing described parameter to descrambling are carried out transmission channel and are separated multiple connection, separate rate-matched and conciliate and once interweave.This step is handled the data of each TrCH in each radio frames.
In step F, can calculate the address after the multiple connection of each TrCH, like this, transmission channel among the present invention is separated multiple connection and is meant, according to the address after the described multiple connection that calculates, the rate-matched reconciliation is separated in the taking-up of the data behind the descrambling of each TrCH once interweave.Comprise in the memory space that distributes in step F and separate the corresponding OPADD that once interweaves, therefore, the mode that can adopt the address to move is carried out described transmission channel and is separated multiple connection, separates rate-matched and conciliate and once interweave, and detailed process sees also hereinafter.Because what the radio frames equilibrium was added at data division is redundant bit, need not the operational redundancy bit so separate radio frames when balanced, in the present invention, separate the radio frames equalization operation and also can omit.
Therefore, can omit radio frames in this step and merge, separate the operation of radio frames equilibrium, and can save radio frames merging data district and conciliate radio frames equalization data district.
J, in the TTI of each TrCH correspondence, utilize that described parameter is carried out channel decoding to separating data after once interweaving, transmission block is cut apart and CRC check.
Decoded mode is Viterbi decoding or Turbo decoding.Because viterbi decoder and Turbo code decoder can guarantee that the input of decoder can be according to the POS INT decoding of any bit, and can be according to the position output decoding data of any bit, therefore, the code block cascade operation can be omitted, and a yard code block cascade data district can be saved.Whether each code block needs decoding, is by the TTI of this TrCH decision, if formed the TTI of this TrCH by the data of separating rate-matched, then will carry out the decoding of data.Therefore step J is that the TTI of each TrCH carries out once.
Fig. 8 separates secondary interleaving process schematic diagram for prior art.With reference to Fig. 8, the data symbol number of every row that prior art interweaves according to secondary, the data of input are arranged according to the corresponding data symbol number of every row, and displacement between being listed as according to table 3 is read the memory space that is deposited into after the deinterleaving by being about to data symbol then.Displacement patterns between table 3 is listed as for secondary interweaves.
| Columns | Method of replacing between |
| 30 | <0，20，10，5，15，25，3，13，23，8，18，28，1，11，21，6， 16，26，4，14，24，19，9，29，12，2，7，22，27，17> |
Table 3
With reference to Fig. 9, when all time slot data of a radio frames that receives all through separating the physical channel mapping after, the method realization of adopting the address to move is separated secondary and is interweaved.The every columns that interweaves according to the secondary that calculates is according to symbol numbers, and frame data of separating after the physical channel mapping are separated the arrangement that secondary interweaves, and corresponding data are carried out label, finds out the row that secondary interweaves of separating of data correspondence.Reads data symbols successively according to separating the secondary corresponding OPADD that interweaves in the memory space that distributes in the step F, deposits the data symbol of the row of correspondence in corresponding memory space.To every columns certificate, deposit Data Position in and be spaced apart 30 data symbols.
Figure 10 separates a weaving diagram (TTI=40ms) for prior art.With reference to Figure 10, according to prior art, at first carry out transmission channel and separate the multiple connection operation, distinguish the data of each transmission channel.Then the data of each transmission channel being separated the rate-matched reconciliation once interweaves.Need data space behind two block encodings, one like this and separate data space after data space before the rate-matched and one separate rate-matched.Understand the rate-matched marking operation successively, separate the rate-matched output function, separate once and interweave, taken very big memory space and computing time.Table 4 is for separating the displacement patterns between row that once interweaves.
| TTI | Columns | Method of replacing between row |
| 5ms
(＊1)， |
1 | <0> |
| |
2 | <0，1> |
| |
4 | <0，2，1，3> |
| |
8 | <0，4，2，6，1，5，3，7> |
Table 4
Figure 11 is the schematic diagram of step I in the embodiment of the invention.The present invention moves the reconciliation rate-matched with the address and combines, the method that adopts the address to move, and (TrCH) separates the reconciliation rate-matched that once interweaves to each transmission channel.This is operated every 10ms (radio frames) each transmission channel (TrCH) is handled once.Under punching (puncture) pattern, take out the data symbol of corresponding transmission channel successively, carry out anti-punch operation according to the E parameter value, move the realization data manipulation by the address.If current execution n frame, interval T TI/10 symbol writes symbol successively.Other processing of separating rate matching pattern can be adopted similar mode.Can separate the reconciliation rate-matched that once interweaves to a plurality of TrCH simultaneously, only need calculate the Input Address of each TrCH correspondence, the symbol that needs are kept carries out the address and moves.
Adopt above-mentioned down channel coding/decoding method, the memory space that saved the encoding block cascade, separate the radio frames equilibrium, radio frames merges, separate rate-matched, bit descrambling, physical channel merge.Aspect calculating, adopt the address to move mode, omitted encoding block cascade, radio frames merging, the computing time that physical channel merges and subframe merges.And utilize the time slot method to handle the physics channel Mapping, and improved the efficient of deal with data, made full use of the free time that receives other time slots.Because TFCI is present on the minimum receiving slot, when receiving the data of minimum receiving slot, carry out TFCI decoding simultaneously, obtained transformat combination, calculated the parameter that needs in the process, saved the computing time that needs repetition parameter in the pilot process.
In sum, the method that the present invention adopts the address to move has been simplified realization flow, has reduced the use of memory headroom, has improved implementation efficiency.Add up after tested, in up cataloged procedure, compared following advantage with the standard implementation method:
(1) before chnnel coding, saved 51% data space, the time of implementation has saved 9%;
(2) in the process, saved 75% data space in chnnel coding to the rate-matched, the time of implementation has saved 67%;
(3) in the transmission channel rate-matched to the physical channel mapping process, saved 57% data space, the time of implementation has saved 34%.
Add up after tested, in descending decode procedure, compared following advantage with the standard implementation method:
(1) be decoded in the CRC check process at transmission channel, saved 51% data space, the time of implementation has saved 33%;
(2) in the process, saved 75% data space before the transmission channel radio frames is incorporated into the transmission channel decoding, the time of implementation has saved 67%;
(3) map to transmission channel and separate in the rate-matched process separating physical channel, saved 28% data space, the time of implementation has saved 34%.
Although embodiment of the present invention are open as above, but it is not restricted to listed utilization in specification and the execution mode, it can be applied to various suitable the field of the invention fully, for those skilled in the art, can easily realize other modification, therefore under the universal that does not deviate from claim and equivalency range and limited, the legend that the present invention is not limited to specific details and illustrates here and describe.
Claims (9)
1. a up channel coding method that is used for the TD-SCDMA system is characterized in that, comprises the steps:
A, in minimum transfer time interval TTI, receive the data of a plurality of transmission channel TrCH that need to send after, calculation code composite transport channel CCTrCH and the used parameter of each TrCH, and according to required memory space in the described parameter distribution up channel cataloged procedure;
B, in the TTI of each TrCH correspondence, utilize described parameter that the data of TrCH are carried out CRC check and transmission block cascade, the data after the cascade are carried out chnnel coding;
C, in every 10ms, the data after utilizing described parameter to the chnnel coding of each TrCH once interweave, rate-matched and transmission channel multiple connection;
D, in every 10ms, the data after utilizing described parameter to the transmission channel multiple connection are carried out bit scramble, secondary interweaves and the physical channel mapping.
2. the method for claim 1 is characterized in that:
Comprise the OPADD after each TrCH corresponding transmission channel multiple connection in the described memory space;
Among the step C, the mode that adopts the address to move carries out describedly once interweaving, rate-matched and transmission channel multiple connection.
3. the method for claim 1 is characterized in that:
Comprise the secondary corresponding OPADD that interweaves in the described memory space;
Among the step D, the mode that adopts the address to move is carried out described secondary and is interweaved.
4. the method for claim 1 is characterized in that:
Comprise the corresponding OPADD of physical channel mapping in the described memory space;
Among the step D, the mode that adopts the address to move is carried out described physical channel mapping.
5. the method for claim 1 is characterized in that:
Among the step D, adopt the scrambling filter to carry out described bit scramble.
6. a down channel coding/decoding method that is used for the TD-SCDMA system is characterized in that, comprises the steps:
E, in each subframe, receive data, according to the data parsing transformat combination indication TFCI index that receives according to time-slot sequence;
F, TFCI is deciphered, obtain the transformat of each TrCH, in order to determining the data details of each TrCH, and calculate CCTrCH and the used parameter of each TrCH, according to required memory space in the described parameter allocation of downlink channel-decoding process;
G, in each time slot, utilize described parameter that the reception data of this time slot are separated physical channel mapping;
H, in every 10ms, utilize described parameter to separate to separating frame data after the physical channel mapping that secondary interweaves and bit descrambling;
I, in every 10ms, the data after utilizing described parameter to descrambling are carried out transmission channel and are separated multiple connection, separate rate-matched and conciliate and once interweave;
J, in the TTI of each TrCH correspondence, utilize that described parameter is carried out channel decoding to separating data after once interweaving, transmission block is cut apart and CRC check.
7. method as claimed in claim 6 is characterized in that:
Comprise in the described memory space and separate the secondary corresponding OPADD that interweaves;
Among the step H, the mode that adopts the address to move is carried out the described secondary of separating and is interweaved.
8. method as claimed in claim 6 is characterized in that:
Among the step H, adopt the descrambling filter to carry out described bit descrambling.
9. method as claimed in claim 6 is characterized in that:
The OPADD after once interweaving of separating that comprises each TrCH correspondence in the described memory space;
Among the step I, the mode that adopts the address to move is carried out described transmission channel and is separated multiple connection, separates rate-matched and conciliate and once interweave.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378940A (en) * | 2012-04-17 | 2013-10-30 | 马维尔国际有限公司 | Uplink channel coding method and device for TD-SCDMA system |
| WO2018027669A1 (en) * | 2016-08-10 | 2018-02-15 | Qualcomm Incorporated | Rate matching for block encoder |
| CN107734555A (en) * | 2016-08-12 | 2018-02-23 | 中国移动通信有限公司研究院 | Data transmit-receive passage, data transmission method and device |
| CN110495115A (en) * | 2017-03-31 | 2019-11-22 | 高通股份有限公司 | Technology for rate-matched and intertexture in wirelessly communicating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1150706C (en) * | 2001-10-22 | 2004-05-19 | 信息产业部电信传输研究所 | Method for multiplexing WCDMA up channel |
| US7519129B2 (en) * | 2002-12-12 | 2009-04-14 | Cambridge Broadband Networks Limited | Precoding of contention words in a fixed wireless access system |
| CN101174937B (en) * | 2006-11-03 | 2010-11-03 | 中兴通讯股份有限公司 | Method for transmission channel multiplexing of ascending link route |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103378940A (en) * | 2012-04-17 | 2013-10-30 | 马维尔国际有限公司 | Uplink channel coding method and device for TD-SCDMA system |
| CN103378940B (en) * | 2012-04-17 | 2018-01-16 | 马维尔国际有限公司 | Up channel coding method and device for TD SCDMA systems |
| WO2018027669A1 (en) * | 2016-08-10 | 2018-02-15 | Qualcomm Incorporated | Rate matching for block encoder |
| WO2018028294A1 (en) * | 2016-08-10 | 2018-02-15 | Qualcomm Incorporated | Rate matching for block encoding |
| US11218177B2 (en) | 2016-08-10 | 2022-01-04 | Qualcomm Incorporated | Rate matching for block encoding |
| US11973518B2 (en) | 2016-08-10 | 2024-04-30 | Qualcomm Incorporated | Rate matching for block encoding |
| CN107734555A (en) * | 2016-08-12 | 2018-02-23 | 中国移动通信有限公司研究院 | Data transmit-receive passage, data transmission method and device |
| CN107734555B (en) * | 2016-08-12 | 2021-07-30 | 中国移动通信有限公司研究院 | Data receiving and transmitting channel, data transmission method and device |
| CN110495115A (en) * | 2017-03-31 | 2019-11-22 | 高通股份有限公司 | Technology for rate-matched and intertexture in wirelessly communicating |
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