WO2011063550A1 - Channel decoding method and device thereof - Google Patents

Abstract

A decoding method, a re-transmission processing method and devices thereof are provided. The decoding method includes: iterative cyclic redundancy check (CRC) check decoding is performed on a code block in a received transmission block; if results of consecutive two times of iteration both indicate the CRC check decoding for the code block is successful, the CRC check decoding for the code block is judged to be successful. With the above technical scheme, the miss detection probability for code blocks can be reduced, and the detection reliability for the code blocks can be improved.

Description

 Channel decoding method and device thereof

 The present invention relates to wireless transmission technologies, and in particular, to a channel decoding method and apparatus therefor. Background technique

 As real-time, high-rate data services increasingly become the primary application of wireless networks, the requirements for end-to-end latency in wireless communication networks are becoming more stringent. For example, 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) has established that the end-to-end delay of the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) user plane should be less than 5ms, while on eNode B, Layer 1 & Layer 2 The HARQ (Hybrid Automatic Repeat Request) processing time should be limited to 3ms.

 In the 3GPP LTE protocol, one transport block (TB) can be divided into a plurality of coding blocks (CBs), and each coding block is independently encoded and decoded. Two layers of CRC check code are used for one transport block. The first layer CRC check is performed on each CB, and the second layer CRC check is performed on the TB.

 There are two existing decoding schemes: one is to perform decoding for each CB, even if there is already a CB decoding in the TB and the CRC check is considered incorrect, the decoding is performed on all subsequent CBs in the TB. At the same time, even if there is a CB that has been correctly decoded in the previous transmission, it will still be decoded during HARQ retransmission; another scheme is to perform decoding for each CB, for TBs with multiple CBs. For example, if there is a CB that is not correctly decoded, the decoding of all CBs subsequent to the TB is stopped, and the input buffer of the decoder is cleared.

 Fig. 8 is a flow chart showing the CRC (Cyclic Redundancy Check) check in the case where there is only one CB in one TB in the second scheme. As shown in FIG. 8, since there is only one CB in the TB, step 710 directly performs CRC check on the TB. If the check succeeds in step 720, the process proceeds to step 760, and the decoding of the TB is successfully completed. If it is determined in step 720 that the verification fails, step 730 determines whether the maximum number of iterations is reached. If yes, proceeding to step 750, the decoding of the TB fails. If not, the next iteration is specified by step 740, and the process returns to step 710. An iterative operation.

Fig. 9 is a flow chart showing the CRC check in the case where there are a plurality of CBs in one TB in the second scheme. As shown in FIG. 9, steps 802, 804, 806, 808, 818, 828, etc. are similar to steps 710-760 in FIG. 8, except that in FIG. 9, it is a CB in the TB instead of The TB The verification is performed, so these steps are not described here. In FIG. 9, when it is determined in step 806 that the iteration reaches the maximum number of times, step 810 sets the decoding information bit of the CB to 0, indicating that the decoding of the CB has failed, and in step 812, it is determined whether the CB is the last in the TB. A CB, if yes, proceeds to step 818, the decoding of the TB fails, and if not, the decoding of the subsequent CB is stopped via step 814 and the input buffer of the Turbo decoder used for decoding is cleared in step 816, and then proceeds to step 818. If it is determined in step 804 that the decoding of the CB is successful, the decoding information bit of the CB is set to 1 in step 820, and it is determined in step 822 whether the CB is the last CB in the TB. If not, the decoding of the next CB is specified by step 832, and returning to step 802 to perform a specific decoding step. If yes, step 824 performs CRC check decoding on the TB, and determines whether the decoding is successful in step 826. If successful, proceeds to step 828 to end the decoding. If it fails, proceeds to step 840, determines that the decoding failed, and ends the TB. Decoding. Summary of the invention

 Embodiments of the present invention propose a decoding method, a retransmission processing method, and an apparatus therefor.

 According to an aspect of the present invention, a decoding method is proposed, comprising performing an iterative CRC check decoding on a coded block in a received transport block; if the results of two consecutive iterations display a CRC on the coded block If the verification decoding is successful, it is determined that the CRC check decoding of the coding block is successful.

 According to another aspect of the present invention, a retransmission processing method is provided, comprising: receiving a retransmission version of a transport block, and transmitting information bits in the retransmission version of the coding block to a previous transmission of the transport block Corresponding original information bits are soft combined to generate combined information bits; CRC check decoding is performed on the combined information bits using the above decoding method.

 According to still another aspect of the present invention, a decoder is provided, including: a decoding module, an CRC check decoding for iteratively decoding a coded block in a received transport block; and an accumulation module for calculating a CRC in the decoding module Verifying the number of iterations of decoding; the decision module is configured to determine whether the CRC check decoding of the decoding module is successful, and when the result of two consecutive iterations shows that the CRC check decoding is successful, the CRC check decoding of the coded block is decided. success.

According to still another aspect of the present invention, a receiver is provided, including a HARQ soft combiner, configured to receive a retransmitted version of a transport block, and information bits in the coded block of the retransmitted version and the transport block The corresponding original information bits in the previous transmission are soft combined to generate the combined information bits. The forward error control unit is configured to perform CRC check decoding on the combined information bits using the above decoder. According to the technical solution provided by the embodiment of the present invention, the missed detection probability of the coding block can be reduced, and the detection reliability of the coding block is enhanced. DRAWINGS

 The advantages of the present invention will become readily apparent from the following description in conjunction with the drawings in which:

 1 is a block diagram showing the structure of a decoder according to an embodiment of the present invention;

 2 is a block diagram showing the structure of a receiver in accordance with an embodiment of the present invention;

 3 shows a schematic diagram of channel decoding for a transport block with only one coded block, in accordance with an embodiment of the present invention;

 4 shows a schematic diagram of channel decoding for a plurality of coded blocks for a transport block, in accordance with an embodiment of the present invention;

 Figure 5 is a diagram showing the generation of decoded information bits for a plurality of coded blocks for a transport block, in accordance with an embodiment of the present invention;

 6 shows a flow chart of HARQ retransmission processing according to an embodiment of the present invention;

 FIG. 7 is a block diagram showing the structure of a receiver according to another embodiment of the present invention; FIG.

 Fig. 8 shows a schematic diagram of channel decoding for a transport block having only one coded block according to the prior art; Fig. 9 is a diagram showing channel decoding for a plurality of coded blocks for a transport block according to the prior art. detailed description

 The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, and the details and functions that are not necessary for the present invention are omitted in the description to avoid confusion of the understanding of the present invention.

 In the embodiment of the present invention, a decoder is provided. As shown in FIG. 1, the decoding module 110 is configured to perform CRC check decoding on the coded block in the received transport block. The accumulating module 120, For determining the number of iterations of the CRC check decoding in the decoding module 110, the decision module 130 is configured to determine whether the decoding of the decoding module 110 is successful, and when the result of two consecutive iterations shows that the decoding is successful, the decoding of the coded block is determined. success. As a special case, when only one iteration result shows that the decoding is successful, if the accumulation module 120 displays that the successful iteration is the last iteration, the decision module 130 also determines that the decoding of the coded block is successful.

The decoder also includes an information generating module 140 for generating decoding information bits indicating whether decoding of each of the code blocks in the transport block is successful for retransmission. The decoder also includes an input buffer 150 for buffering information bits of the transport block to be input to the decoding module 110.

 In an embodiment of the present invention, a receiver for retransmission processing is proposed. As shown in FIG. 2, the receiver includes a HARQ soft combiner 230, configured to receive a retransmitted version of the transport block, and the information bits in the coded block of the retransmitted version correspond to the last transmission of the transport block. The original information bits are soft combined to produce a combined information bit. The forward error control unit 210 is configured to perform CRC check decoding on the combined information bits using the decoder described above.

 The receiver also includes a memory 240 for storing soft bits of the HARQ transmission, i.e., bits of the coding block in the transport block that have not been iteratively decoded as the original information bits. A memory controller 250 is provided for controlling access to the memory 240. The lookup table unit 220 is configured to store the decoding information bits generated by the error control unit 210 and the corresponding retransmission information, such as the user ID HARQ process ID and the base address of the transport block, etc., wherein the base address of the transport block points to the corresponding address in the memory 240. The storage address of the bit.

 The forward error control unit 210 includes a turbo decoder 211, configured to perform CRC iterative decoding on each of the coding blocks in the transport block, and generate decoding information bits of each of the coding blocks, when the decoding result of each coding block is When correct, the CRC is iteratively decoded by the CRC to generate decoding information bits of the transport block, wherein the transport block or the code block is considered to be iteratively decoded when two iterations succeed in iterative decoding. The CRC checksum calculation module 212 is configured to check the correctness of the output of the current coded block after passing through the turbo decoder. The decoding control module 213 is configured to: when the decoding information bit of the transport block indicates that the transport block does not pass the iterative decoding, write the decoding information bits of each code block in the transport block to the lookup table unit 220 to facilitate the decoding information according to the decoding information. The bits are subjected to HARQ retransmission processing.

The Turbo decoder 211 described herein is a non-limiting example of the decoder shown in FIG. The receiver also includes a selector 260 for selecting weighting coefficients for the new soft bits of the transport block based on the decoded information bits stored in lookup table unit 220. . _{The w} selector 270 is configured to select a weighting coefficient for the original soft bit of the transport block according to the decoded information bits stored in the lookup table unit 220. Here, W _new selector 260 and . _{The w} selector 270 can also be implemented with one device. Wherein, the HARQ soft combiner 230 includes a first multiplier 231 for multiplying the weighting coefficients of the new soft bits with the new soft bits, and a second multiplier for multiplying the weighting coefficients of the original soft bits by the original soft bits. 232 and an adder 233 that adds the output results of the first multiplier 231 and the second multiplier 232. The HARQ soft combiner further includes a clip (bit truncation module) 234 for removing redundant sign bits to generate a merged Soft bit. Although the decoder and receiver of the embodiments of the present invention have been described above in the form of separate functional modules, each of the components shown in FIG. 2 can be implemented in multiple applications in practical applications, with multiple components shown. In practice, it can also be integrated into a chip or a device. The decoder receiver can also include any unit and device for other purposes.

 The functions of the decoder provided by the embodiment of the present invention and the receiver for retransmission processing will be further described below with reference to Figs.

 The operation of the turbo decoder 211 is first discussed with respect to the case where only one coding block is included in the transport block. Figure 3 shows the decoding scheme for this case.

For transport blocks that include only one coded block, only the CRC check of the TB is used. The decoding module 110 of the decoder 21 1 performs a CRC check on the TB in step 310. In step 320, the decision module 130 determines whether the kth iteration CRC checksum TB_CRC_checksum^ of the TB is true (assuming k is not equal to the configured maximum number of iterations max- iteration), that is, the kth iteration of the TB Whether to pass the CRC check. If passed, at step 340 before the decision block 130 determines whether iteration through the CRC check, Gen _{Jie, TB- CRC_ch eC k SU m (} kl) is true. If the result of the determination in step 340 is true, it is considered that the decoding of the transport block is correctly completed and the iterative decoding for the transport block is terminated in step 340. If the decision module 130 determines in step 340 that TB_CRC_checksum(kl) is not true and if step 350 determines that the number of iterations reaches the configured maximum number of iterations, as a special case, it is also considered that the decoding of the transport block is correctly completed and in step 340 Terminates iterative decoding for the transport block. If the step 350 determines that the number of iterations does not reach the configured maximum number of iterations, the accumulating module 120 accumulates the number of iterations in step 360 and returns to step 310 for the CRC check of the next iteration. If step 320 determines that the kth iteration CRC checksum TB_CRC_checksum(k) of TB is not true, and step 370 determines that the configured maximum number of iterations is reached, then decoding of the transport block is considered to be failed, in step 380. The iterative decoding of the transport block is terminated. If step 370 determines that the configured maximum number of iterations has not been reached, then in step 390 the accumulation module 120 accumulates the number of iterations and returns to step 310 for the CRC check of the next iteration.

Regardless of the result, after the CRC check of the TB is completed, the information generating module 140 generates a CRC check result of the TB, and notifies the MAC (Media Access Control) layer in the form of an ACK/NACK indication flag to activate the HARQ retransmission, The CRC check result may be a decoded information bit indicating whether the decoding of the transport block is successful. FIG. 4 shows a decoding scheme corresponding to a transport block including a plurality of coded blocks. Unlike the case in Figure 3, Figure 4 uses a two-layer CRC check.

 The iterative decoding operation steps 402, 404, 406, 408, 410, 412, 414 for the i-th coding block CB(i) in the transport block TB in FIG. 4 and the iterative decoding step for the transport block TB in FIG. 3, respectively. 310, 320, 340, 350, 360, 370, 390 correspond to only the CRC check decoding of the coded block instead of the transport block in FIG. For the sake of brevity, these steps will not be repeated here.

 As shown in FIG. 4, in step 404, the decision module 130 determines that the kth iteration CRC check and the CB_CRC-checksum(k, i) for the i-th code block CB(i) are not true. If the decision module 130 determines in step 412 that the maximum number of iterations has been reached, iterative decoding of CB(i) is considered to have failed. In step 416, the information generation module 140 sets the decoding information bit CB_CRC_VECTOR(i) of CB(i) to zero. At this time, if the decision module 130 determines in step 418 that the iterative decoding of all (Num-CB) coded blocks has been completed, proceeding to step 424, the decoding of the entire transport block will end with a failure. If the iterative decoding of all coded blocks is not completed, then in step 420 the decoding module 110 stops iterative decoding of the subsequent coded blocks CB(i)...CB (Num_CB), and in step 422, the Turbo decoder is cleared. The input buffer 150 is passed to step 424.

And in step 404, the decision module 130 determines that the k-th iteration CRC checksum CB_CRC_checksum^, i) is true for the i-th coded block CB(i), if the decision module 130 is in step 406 Determining the previous (i.e., k-1th) iterative checksum CB_CRC_checksum(kl,i) of the i-th code block CB(i) is true, or if the i-th code block is judged in step 406 The k-1th iteration checksum CB_CRC_checksum(kl, i) of CB(i) is not true but step 408 judges that the maximum number of iterations has been reached, then proceeds to step 426, and it is considered that the iterative decoding of CB(i) is successful. And the information generating module 140 sets the decoding information bit CB_CRC_VECTOR(i) of CB(i) to 1, and sets the decoding information bit TB_CRC of the transport block to 0. In step 428, the decision module 130 determines whether iterative decoding of all (Num_CB) coded blocks has been completed. If not, the accumulation module 120 accumulates in step 1 of step 430 and returns to step 402 for the CRC of the next coded block. Test. If so, proceeding to step 432, the decoding module 110 begins the CRC check of the transport block. If the decision module 130 determines in step 434 that the verification was successful, then the decoding is considered successful and the decoding of the transport block is ended in step 436. If the verification fails in step 434, the decoding is considered to have failed and the decoding of the transport block is ended in step 438. In the above step 432, the decoding method of the coding block may also be used for the CRC check of the transport block, ie, the CRC check of the transport block is performed according to the method shown in FIG.

 Then, the CRC check result of the TB generated by the information generating module 140 (for example, the transport block checksum TB_CRC_checksum) is notified to the MAC layer in the form of an indication flag of AC/NACK, and the MAC layer receives the TB_CRC_checksum. , respond with ACK.

 For a transport block comprising a plurality of coded blocks, Figure 5 shows a schematic diagram of a transport block based on early stop decoding. Figure 5 shows an example where the maximum number of iterations (maxjteration) is equal to 8. As can be seen from the figure, the first two coding blocks CB ( 1 ) and CB (2 ) pass the CRC check of the turbo decoder, and the corresponding decoding The information bit is set to 1. At this time, if the third coding block CB (3) does not pass the CRC check, the decoding of the subsequent coded block is stopped, and the CB (4) is set while the decoding information bit corresponding to CB (3) is set to 0. The decoding information bit corresponding to CB (8) is set to 0, and the decoding information bit corresponding to the transport block is set to 0. Thereby, the decoding can be completed as early as possible and the decoding information vector CB_CRC-VECTOR of all the coding blocks can be created without waiting for all the coding blocks to complete decoding.

 The function of the receiver for retransmission processing provided by the embodiment of the present invention will be further explained below with reference to FIG.

 In step 510, the turbo decoder 1 1 1 in the forward error control unit 110 of Fig. 2 iteratively decodes the received transport block in the manner described in Fig. 3 or 4 to generate decoded information bits. Wherein, the transport block is considered to be iteratively decoded when two consecutive iterations are successful in the iterative decoding.

 When the decoded information bit indicates that the transport block has not been iteratively decoded, in step 520, the bits in the transport block are stored in the memory 140 as original information bits, and each of the transport blocks is encoded by the decode control module 113. The decoded information bits are written to the lookup table unit 120. In the lookup table unit 120, the decoded information bits are associated with the address space of the memory 140, the specific user ID, and the HARQ process ID, and are used to locate each of the transport blocks by the user ID and the HARQ process ID at the time of HARQ retransmission. The memory space address of the bits of the encoding block (ie, the original soft bits). The memory 140 herein may be internal or external memory such as SRAM, SDRAM > DDR SDRAM > DDR2 SDRAM ^ DDR3 SDRAM.

In step 530, when the transmitter initiates HARQ retransmission due to the HARQ NACK indication of the receiver and receives the HARQ retransmitted transport block on the receiver side, the HARQ soft combiner 130 of the receiver performs HARQ soft before decoding. Merge operation. Two well-known merging algorithms are usually used: Maximum specific weight Maximal Ratio Combining and Equal Gain Combining. The soft merge formula can be summarized as:

Softbits _amh = W _mw * Softbits + W _M * Softbits _M ( 1 ) where is the weighting factor for the new soft bit S 3⁄4^„, „ _w is the weighting factor for the original soft bit 5 /^'t _w . For equal gain combining, each HARQ transmission uses the same ratio and ff. _{w is} determined by the number of HARQ transmissions, and the specific decision steps of W are well known to those skilled in the art, and will not be described again for the sake of brevity. For maximum ratio consolidation, and. _/;/ is a function of the number of each HARQ transmission and the signal to noise ratio, the specific decision steps of which are also known to those skilled in the art.

In an embodiment of the present invention, when performing HARQ soft combining, the weighting coefficient selectors ( _ew selector 160 and _w selector 170) are added. The memory address and the CB-CRC-VECTOR can be obtained by searching for the user ID of the HARQ retransmission and the HARQ process ID of the current HARQ retransmission. For the ith coding block CB (i), CB_CRC_VECTOR (i) is used as the input of the weighting coefficient selector, and the outputs of the weighting coefficient selector are as follows:

, _

m ^w "

 , _

根据所获得的存储器地址，通过存储器控制器 150从存储器 140中取出 CB(i) 的原始软比特（即， 未通过解码的传输块中对应的编码块的比特）， 使用乘法器 132 将原始软比特和 '。_w相乘， 使用乘法器 131将 和从 HARQ重传中得到的 CB (i)的新的软比特相乘， 通过相加器 133将乘法器 131和 132的结果相加。 Clip 134 用于消除多余的符号位， 将 Clip 134处理后的结果作为合并后的软比特输入到前向 误差控制单元 110进行进一步的解码。 ^M —

Based on the obtained memory address, the original soft bits of CB(i) are taken from the memory 140 by the memory controller 150 (i.e., the bits of the corresponding coded block in the decoded transport block are not passed), and the original soft is used using the multiplier 132. Bit and '. _{The w is} multiplied, the new soft bit of CB (i) obtained from the HARQ retransmission is multiplied by the multiplier 131, and the results of the multipliers 131 and 132 are added by the adder 133. The Clip 134 is used to eliminate redundant sign bits, and the result of the Clip 134 processing is input to the Forward Error Control Unit 110 as a combined soft bit for further decoding.

It can be seen from equation (2) that when CB_CRC_VECTOR (i) =0, that is, CB (i) does not pass decoding, the weighting coefficient for soft combining is selected according to the user's selection of the merging algorithm, and when CB CRC—VECTOR (i) =1, that is, when CB (i) is decoded, W' _new =0, W' _old = l, which means that in the decoding of TB, the original soft bit pair that has been decoded is directly used. CB (i) is decoded.

In step 540, forward error control unit 110 decodes the combined soft bits in accordance with the method described in FIG. 2 or 3. Figure 7 presents a receiver structure in accordance with another embodiment of the present invention. The structure of the receiver differs from the structure proposed in Fig. 2 in that the ^^ selector 160 and the selector 170 are redundant, and the soft bit combining controller 135, the RAM 115, and the decoder output multiplexer 114 are added. .

 The method corresponding to Fig. 7 differs from the method corresponding to Fig. 2 in that the correct coding block information is stored in the form of soft bits or in the form of original information bits.

 The method of the present embodiment stores the original information bits of the correct coded block on a code-by-code basis using the internal RAM 115. The corresponding start address and the size of the code block in the RAM 115 are registered by a register (not shown). Once a CB has not passed the CRC check, the decoding of the entire transport block is stopped. The contents of the RAM 1 15 are read out to the external memory 140 through the memory controller 150 based on the registered start address and size information. The memory space used to store these information bits may be part of the memory space in which the soft bits of the same coded block are stored, or may be the memory space of the same memory or other memory space of other memory. During the soft merge operation that receives the HARQ retransmission, the soft bit merge controller 135 reads CB_CRC_VECTOR. When soft combining of CB(i) is initiated, if CB_CRC_VECTOR(i) is equal to 1, decoding of the encoding block is not performed, but the encoding block is directly read from the external memory 140 by the memory controller 150. The information bits are forwarded to the decoder output multiplexer 114 of the forward error control unit 110 as a decoded output.

Through the above technical solution, since one iteration is performed, the missed detection probability of the coding block is reduced from 2 - ^R to 2 - ^2R , and the detection reliability of the coding block is enhanced, where R is the polynomial constraint length of the cyclic redundancy coding.

 Since the coded block that has been successfully decoded is protected, the influence of the previously decoded HARQ retransmission on the coded block that has been successfully decoded due to some unknown reason is avoided. Therefore, the retransmission processing method of the embodiment of the present invention can achieve better performance.

 Those skilled in the art will readily recognize that the different steps of the above methods can be implemented by a programmed computer. Herein, some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps. For example, the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and a magnetic tape), a hardware or an optically readable digital data storage medium. Embodiments also include a programming computer that performs the steps of the above method.

The description and drawings merely illustrate the principles of the invention. It should therefore be appreciated that those skilled in the art are able to suggest different structures, and although these various structures are not explicitly described or illustrated herein, the present invention is embodied It is included in its spirit and scope. In addition, all of the examples mentioned herein are explicitly used primarily for teaching purposes to assist the reader in understanding the principles of the present invention and the concepts promoted by the inventors, and should be construed as not to the specific examples. And conditional restrictions. In addition, all statements herein reciting principles, aspects, and embodiments of the invention, as well as specific examples thereof, are included.

 The above description is only used to implement the embodiments of the present invention, and those skilled in the art should understand that any modifications or partial substitutions without departing from the scope of the present invention should fall within the scope defined by the claims of the present invention. The scope of the invention should be determined by the scope of the claims.

Claims

Rights request 1. A decoding method, comprising:  Performing an iterative CRC check decoding on the coded block in the received transport block;  If the result of two consecutive iterations shows that the CRC check decoding of the coded block is successful, then the CRC check decoding of the coded block is determined to be successful.  2. The method of claim 1 further comprising:  If the CRC check decoding for each of the encoded blocks in the transport block is successful, an iterative CRC check decoding is performed on the transport block.  3. The method according to claim 1, wherein if the CRC check decoding of the iteration of the current coding block fails, the CRC check decoding of the iteration of the subsequent coding block in the transport block is terminated, and the decision is made to The CRC check decoding of the transport block failed.  4. The method according to claim 1, wherein, if only one coding block is included in the transport block, performing the iterative CRC check decoding on the coded block in the received transport block comprises:  Performing an iterative CRC check decoding directly on the transport block;  If the result of two consecutive iterations shows that the CRC check decoding of the coded block is successful, then the decision to successfully decode the CRC check of the coded block includes:  When the results of two consecutive iterations show that the CRC check decoding of the transport block is successful, it is decided that the CRC check decoding of the transport block is successful.  5. A retransmission processing method, comprising:  Receiving a retransmission version of the transport block, and soft combining the information bits in the coded block of the retransmitted version with the original information bits corresponding to the previous transmission of the transport block to generate the combined information bits;  The merged information bits are subjected to CRC check decoding using the method of any one of claims 1 to 4.  6. The method of claim 5, further comprising  When the current transport block CRC check decoding fails, storing decoding information bits indicating whether the CRC check decoding of each code block in the transport block is successful, and storing the information bits in each of the code blocks as original information bits ; Information indicating that the transport block CRC check decoding failed is transmitted to the MAC layer to activate HARQ retransmission. The method according to claim 6, wherein the soft combining the information bits in the coded block of the retransmitted version with the corresponding original information bits to generate the combined information bits comprises:  Decoding the stored decoded information bits as code blocks that have been successfully decoded, using their corresponding original information bits as the combined information bits;  The stored decoded information bits are indicated as code blocks that failed to be decoded, and the information bits in the coded block of the retransmitted version are soft combined with the corresponding original information bits to generate combined information bits.  The method according to claim 6, wherein the performing CRC check decoding on the merged information bits using the method according to any one of claims 1 to 4 comprises:  The stored decoded information bits are indicated as code blocks that have been successfully decoded, and are not subjected to CRC check decoding, and their corresponding original information bits are used as outputs for successful decoding;  The stored decoded information bits are indicated as code blocks that have failed to be decoded, and the corresponding combined information bits are subjected to CRC check decoding using the method according to any one of claims 1 to 4.  9. The method of claim 6, wherein the algorithm for performing the soft combining comprises a maximum ratio weight combining algorithm and an equal gain combining algorithm.  10. A decoder comprising:  a decoding module, configured to perform iterative CRC check decoding on the received block in the received transport block; an accumulation module, configured to calculate a number of iterations of the CRC check decoding in the decoding module;  The decision module is configured to determine whether the CRC check decoding of the decoding module is successful, and when the result of two consecutive iterations shows that the CRC check decoding is successful, the CRC check decoding of the coded block is determined to be successful.  11. The decoder of claim 10, further comprising:  And an information generating module, configured to generate decoding information bits indicating whether CRC check decoding of each code block in the transport block is successful, for retransmission use.  12. A receiver, including  a HARQ soft combiner, configured to receive a retransmission version of a transport block, and soft combine the information bits in the coded block of the retransmitted version with corresponding original information bits in a previous transmission of the transport block to generate a merge Post information bit;  A forward error control unit for performing CRC check decoding on the combined information bits using the decoder of claim 10 or 11. 13. The receiver of claim 12, further comprising - a memory for storing information bits of the coded block in the transport block that has not passed the decoding as the original information bits;  a lookup table unit, configured to store, by the forward error control unit, a decoding information bit indicating whether a CRC check decoding of each code block in the transport block is successful, and storing a corresponding information bit corresponding to the decoded information bit Address information of original bit information stored in the memory;  One or more combining coefficient selectors for selecting a weighting coefficient for the retransmission information bits and the original information bits in the soft combining according to the soft combining algorithm used.  The receiver according to claim 12, wherein the forward error control unit comprises: the decoder according to claim 10 or 11 for iterating the coded blocks in the retransmitted version CRC check decoding, where the coded block is considered to be decoded by an iterative CRC check when two consecutive iterations are successful in the iterative CRC check decoding;  a CRC checksum calculation module, configured to check the correctness of the output of the current coded block after passing through the decoder;  a decoding control module, configured to: when a decoding information bit of the transport block indicates that the transport block does not pass decoding, write decoding information bits of each coding block in the transport block to the lookup table unit to facilitate The decoded information bits are subjected to HARQ retransmission processing.  15. The receiver of claim 13 wherein:  The forward error control unit further includes a RAM memory for storing the original information bits of the decoded correct coding block on a code-by-code basis, and storing the original information bits into the memory after the encoding ends; The merging unit further includes a soft bit merging controller, configured to read the original corresponding to the decoded bit information from the memory when the decoded bit information stored by the lookup table unit indicates that the corresponding coded block has been correctly decoded Information bit  The forward error control unit further includes an output multiplexer for using the original information bits read by the soft bit combining controller as an output of the CRC check decoding.