CN101552659A - Selecting type data retransmitting method and equipment - Google Patents

Abstract

The invention discloses a method for selective data retransmission, comprising: a sending end uses an erasure code to perform erasure correction coding on the sent data to form a plurality of parallel blocks, and performs error detection coding on each block to form an error detection code Blocks, convert all error detection coding blocks to parallel/serial conversion, and then send them to the receiving end after channel processing; the receiving end performs channel inverse processing on the received data, and performs serial/parallel conversion on the processing results to form receiving blocks. Perform error detection on received blocks, count and delete erroneous received blocks, judge whether to retransmit according to the number of deletions, and if not, perform erasure correction decoding to restore the sent data. The invention also discloses a selective data retransmission device. The invention can reasonably control the data retransmission mechanism, effectively reduce the processing delay caused by data retransmission, and improve the system throughput performance.

Description

Method and device for selective data retransmission

technical field

The invention relates to error control technology, in particular to a method and equipment for selective data retransmission.

Background technique

The environment of data transmission in wireless mobile communication is often affected by various factors such as channel fading, inter-symbol interference and time-varying noise. The introduction of error-correcting codes is to use error-correcting codes to encode and decode data at the sending end and receiving end, respectively, and its purpose is to improve and ensure the transmission quality of digital communication systems by adding error-correcting protection to the transmitted data. From the construction method of the encoding, the basic idea is to add some artificial redundant check codes to the information codes to be sent according to the set rules to ensure the reliability of the transmission process.

In order to ensure the quality of data services, in addition to using coding techniques, effective error control protocols, such as the Automatic Retransmission reQuest (ARQ) mechanism, must also be used. However, the channel coding and the automatic repeat request mechanism have their own advantages and disadvantages, so the hybrid automatic retransmission (Hybrid Automatic Retransmission reQuest, HARQ) mechanism that combines the error correction code and the automatic repeat request mechanism appears. This mechanism automatically corrects errors within the error correction capability, and requests retransmission if the error correction capability exceeds the error correction capability, thus ensuring high system transmission efficiency.

Specifically, the block diagram of the HARQ system is shown in Figure 1. In this system, the sender first performs serial-to-parallel conversion on the data and then performs CRC encoding, then performs channel error correction encoding, and performs subsequent modulation and other processing on the encoded data. Send it out; after receiving the data, the receiving end first performs demodulation to obtain the error-corrected coded data, performs channel error-correction decoding on the data, and then performs CRC error detection. If the CRC check result indicates that the transmission is correct, that is, in the transmission The error that may occur has been corrected within the error correction capability of the channel error correction code, and the data at the sending end is restored; if the CRC check result indicates that an error occurred in the transmission, that is, the error occurred during the transmission exceeds the channel error correction code. If there is still an error after error correction and decoding, the receiving end will send a retransmission request to the sending end, requesting to retransmit the data.

In the above-mentioned HARQ method, error detection can be performed by using CRC check, in fact, it can also be performed by using other error detection techniques. When the CRC check is used, the data can be divided into multiple data blocks, and the CRC checks are performed separately. After the retransmission is determined, only the data block with an error in the CRC check can be retransmitted, or the entire data can be retransmitted.

It can be seen from the above that the retransmission mechanism can bring about effective performance improvement, but since the basis of error correction is based on data retransmission and repeated channel decoding processing, there is an increase in delay, an increase in the burden of system resources, and a decrease in system throughput. And other issues.

Contents of the invention

In view of this, the present invention provides a method and device for selective data retransmission, which can improve system transmission efficiency and reduce time delay.

To achieve the above object, the present invention adopts the following technical solutions:

A method for sending selective data retransmission, comprising:

The sending end uses the erasure code to perform erasure coding on the sent data to form multiple parallel blocks;

Performing error detection coding on the blocks after the erasure correction coding to form error detection coded blocks, and performing parallel/serial conversion on all error detection coded blocks;

and sending the result of the parallel/serial conversion to the receiving end after performing channel processing.

Preferably, when the erasure correction code is a short code, encoding the transmitted data with the erasure correction code to form multiple parallel blocks includes:

According to the code block structure of the erasure correction code, the transmitted data is divided into blocks to obtain parallel data blocks, and the number of parallel data blocks is equal to the information bit length of the erasure correction code;

Erasure coding is performed on each column in the parallel data block, and the check digit generated by the coding is appended to the data of the column;

All check digits arranged in columns form check blocks in rows.

Preferably, performing error detection coding on the blocks after erasure correction coding includes: for each block in all data blocks formed by sending data and all check blocks formed by check bits, Error detection coding is performed separately.

Preferably, when the erasure correction code is a long code, encoding the transmitted data with the erasure correction code to form multiple parallel blocks includes:

Erasure correction coding is performed on the sent data, a parity bit generated by the coding is appended to the sent data, and the data after erasure correction coding is divided into blocks to form multiple parallel blocks.

Preferably, performing error detection coding on the blocks after erasure correction coding includes: performing error detection coding on each parallel block formed after erasure correction coding.

Preferably, the error detection code is a cyclic redundancy check (CRC) code.

A receiving method for selective data retransmission, comprising:

The receiving end performs inverse processing on the received data opposite to the channel processing of the sending end, and performs serial/parallel conversion on the processing result in units of error detection coding blocks at the sending end to form receiving blocks;

Perform error detection on each received block, and count and delete the received blocks with errors to obtain the number of deletions;

Judging whether the number of erasures reaches the retransmission selection threshold, if so, requesting retransmission from the sender, otherwise using the same erasure code as the sender to perform erasure correction decoding on the undeleted received blocks to restore the sent data.

Preferably, when the erasure correction code is a short code, performing erasure correction decoding on the undeleted received block to restore the sent data includes:

Perform erasure correction decoding on each column of all non-deleted receiving blocks arranged in parallel, and perform parallel/serial conversion on the decoding results as sending data.

Preferably, when the erasure correction code is a long code, performing erasure correction decoding on the un-erased received block to restore the sent data includes:

Parallel/serial conversion is performed on all non-erased reception blocks arranged in parallel, erasure correction decoding is performed on the parallel/serial conversion results, and the decoding results are used as sending data.

Preferably, the retransmission selection threshold is the number of parity bits of the erasure correction code.

A sending device for selective data retransmission, including:

an erasure-correction coding unit, configured to perform erasure-correction coding on the transmitted data by using an erasure-correction code to form multiple parallel blocks;

A detection coding unit, configured to respectively perform error detection coding on the blocks output by the erasure correction coding unit to form error detection coding blocks;

A parallel/serial conversion unit, configured to perform parallel/serial conversion on all error detection coding blocks output by the detection coding unit;

The channel processing unit is configured to perform channel processing on the data output by the parallel/serial conversion unit and then send it out.

A receiving device for selective data retransmission, comprising:

A channel processing unit, configured to perform inverse processing on the received data opposite to the channel processing at the sending end;

A serial/parallel conversion unit, configured to perform serial/parallel conversion on the inverse processing result output by the channel processing unit in units of error detection coding blocks at the sending end to form receiving blocks;

An error detection unit, configured to perform error detection on each received block output by the serial/parallel conversion unit, and count and delete received blocks with errors to obtain the number of deletions;

The retransmission selection unit is used to judge whether the number of erasures output by the error detection unit reaches the retransmission selection threshold, and when the retransmission selection threshold is reached, request retransmission to the sender, otherwise trigger the erasure correction decoding unit to perform erasure correction decoding code;

The erasure correction decoding unit is configured to perform erasure correction decoding on the received blocks not deleted by the error detection unit under the trigger of the retransmission selection unit, so as to restore the sent data.

It can be seen from the above-mentioned technical solution that in the present invention, at the sending end, the erasure-correcting code is first used to perform erasure-correction coding on the transmitted data to form multiple parallel blocks; then, error detection coding is performed on the blocks after the erasure-correcting code respectively Form error detection coding blocks, and perform parallel/serial conversion on all error detection coding blocks; finally, channel process the result of parallel/serial conversion and send it to the receiving end. At the receiving end, firstly, the inverse processing of the received data is performed opposite to the channel processing of the sending end, and the processing result is serial/parallel converted in units of the error detection coding block at the sending end to form a receiving block; then, each receiving block is Error detection is performed on each block, and the received blocks with errors are counted and deleted to obtain the number of deletions; finally, it is judged whether the number of deletions reaches the retransmission selection threshold, if so, request retransmission from the sender, otherwise use the The same erasure correction code performs erasure correction decoding on the undeleted received block to restore the sent data. Through the above-mentioned cooperation between the sending end and the receiving end, after an error occurs in the error detection, if the error is within a certain range, erasure correction decoding can be used to correct the erasure error, and data retransmission is not necessarily required, thereby forming a data retransmission The reasonable control of the transmission mechanism can effectively reduce the processing delay caused by data retransmission and improve the system throughput performance.

Description of drawings

FIG. 1 is a structural diagram of an existing HARQ system.

FIG. 2 is a schematic diagram of a selective data retransmission system in the present invention.

Fig. 3 is a schematic diagram of the overall flow of the selective data retransmission method in the present invention.

FIG. 4 is a schematic flow chart of a method for sending selective data retransmission in Embodiment 1. FIG.

FIG. 5 is a schematic flowchart of a receiving method for selective data retransmission in Embodiment 1. FIG.

FIG. 6 is a schematic diagram of a specific flow of the method for sending selective data retransmission in Embodiment 2.

FIG. 7 is a schematic flowchart of a receiving method for selective data retransmission in Embodiment 2.

FIG. 8 is a schematic diagram of the cooperation of the present invention with the HARQ hybrid retransmission technology.

Detailed ways

In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

The basic idea of the present invention is: on the sending end and the receiving end of the communication system, the communication system cascading with retransmission or mixed retransmission mechanism has the coding and decoding technology of correction and deletion, so as to form a reasonable control of the data retransmission mechanism .

Deletion means that when a correct or incorrect judgment is made on the received data, if a certain position in the data is lower than the correct judgment threshold and cannot be judged to be true or false, it is deemed to be deleted. In order to correct the erasure error, a linear block code with the function of correcting the erasure can be selected, that is, the erasure correcting code. Commonly used erasure correction codes include Reed-Solomon codes (referred to as: RS codes), BCH codes, etc. These coding techniques are suitable for occasions with short code lengths, and the transmission data needs to be processed in blocks during implementation. For occasions with long code lengths Techniques such as LDPC codes can be used.

FIG. 2 is a schematic diagram of a selective data retransmission system provided by the present invention. Among them, the sending device in the system includes an erasure correction coding unit, a detection coding unit, a parallel/serial conversion unit, and a channel processing unit; the receiving device includes a channel processing unit, a serial/parallel conversion unit, an error detection unit, a retransmission selection unit, and Correction and erasure decoding unit. The selective data retransmission method provided by the present invention can be implemented in the system shown in FIG. 2 . Specifically, the overall flow of the selective data retransmission method is shown in Figure 3, including:

In step 31, the sending end uses erasure codes to perform erasure codes on the sent data to form multiple parallel data blocks.

In step 32, the sending end performs error detection coding on the data blocks after the erasure correction coding to form error detection coded blocks, and performs parallel/serial conversion on all the error detection coded blocks.

In step 33, the sending end performs channel processing on the parallel/serial conversion result and sends it to the receiving end.

In this step, the channel processing operations are various existing channel coding and modulation operations and the like.

So far, the processing operation of the sending end is completed.

Step 34, the receiving end performs inverse processing on the received data opposite to the channel processing of the sending end, and performs serial/parallel conversion on the processing result in units of error detection coding blocks at the sending end to form receiving blocks;

Step 35, performing error detection on each received block, and counting and deleting the received blocks with errors to obtain the number of deletions;

Step 36, judging whether the number of deletions reaches the retransmission selection threshold, if yes, go to step 37, otherwise go to step 38.

In step 37, the receiving end requests retransmission from the sending end, and ends this process.

In step 38, use the same erasure code as that of the sender to perform erasure correction decoding on the received blocks that have not been deleted, and restore the sent data.

So far, the processing operation of the receiving end is completed.

As mentioned above, the code block structure of the erasure coder can be different, and according to the different code block lengths, there are also differences in the processing of data block, outer coding, CRC coding at the sending end, and inverse processing at the receiving end. In the following specific embodiments of the present invention, specific implementations of the present invention will be introduced in detail for the erasure correction coding and decoding technologies using short codes and long codes respectively.

Embodiment one:

In this embodiment, the erasure correction codes used are short codes, such as RS codes, BCH codes, etc., and the error detection codes used are CRC codes.

FIG. 4 is a schematic flow chart of a method for sending selective data retransmission in Embodiment 1. FIG. As shown in Figure 4, the method flow includes:

Step 41, performing block processing to form parallel data blocks.

In this step, according to the code block structure of the erasure correction code, the transmitted data is divided into blocks to obtain parallel data blocks, wherein the number of parallel data blocks is equal to the information bit length of the erasure correction code, as shown in Figure 3 As shown, after block processing, the sent data is divided into K data blocks, each data block is L bytes, and the K data blocks are arranged in parallel.

Step 42, performing longitudinal erasure coding on the data blocks arranged in parallel, and appending the generated check blocks under the data blocks in parallel.

The specific operation of this step is: perform erasure coding on each column in the parallel data blocks, and append the check digits generated by the encoding to the data of the column vertically, and put all the check digits arranged in columns into rows Form data blocks. For example, erasure correction coding is performed on the data of K bytes in the first column, and the data of N-K bytes formed by encoding is appended to the first column, and the data in the first column in the verification block is arranged vertically to form the first column; for The data operations of other columns are the same, and finally a check matrix of L×(N-K) will be formed; then, all the check bits in the check matrix are formed into N-K data blocks by row, as shown in Figure 3. K+ 1 chunk...Nth chunk.

Step 43, perform horizontal CRC encoding on each block, and add a CRC check bit.

In this step, CRC encoding is performed on each of all the data blocks formed by the sent data and all the check blocks formed by the check bits, as shown in Figure 3, for the first block Each of the N sub-blocks from the block to the N-th sub-block is CRC-encoded respectively, and the CRC check bit is appended to the back of each sub-block.

Step 44, perform parallel/serial conversion on the parallel blocks, and output them after channel processing.

In this step, the parallel/serial conversion is performed first, and then the subsequent channel processing is performed according to the system in which the method of this embodiment is located, and the processed output is output to the channel. Specific channel processing may be channel coding, channel modulation, and the like.

So far, the processing flow of the method for sending selective data retransmission ends.

At the receiving end, the inverse process opposite to that at the sending end is performed. The specific flow of the specific receiving method is shown in Figure 5, including:

Step 51: Perform the inverse processing on the received data as opposed to the channel processing at the sending end, and perform serial/parallel conversion on the processing result in units of CRC coded blocks at the sending end to form receiving blocks.

In this step, channel inverse processing is first performed, such as channel demodulation, channel decoding, etc. The specific operations and specific implementation methods of the operations are well-known technologies in the art, and will not be repeated here. After channel inverse processing, the processing result is serially/parallel converted in units of CRC coding blocks to form receiving blocks, so that the receiving blocks include erasure-correcting coding-based data blocks and checksums with additional CRC check digits. Test blocks. Specifically, the processing result is divided in units of the length of each CRC coding block output by step 33 in FIG. 3 to form N receiving blocks.

Step 52: Carry out horizontal CRC error detection on each received block, remove the CRC parity bit, delete the block and perform deletion counting for any block that has an error, and delete the block for any block that does not have an error. Chunking is set to correct.

In this step, the operation of performing CRC error detection on the received block is the same as the existing implementation method, and will not be repeated here. For blocks found to be erroneous through CRC error detection, they are set to be deleted, and all blocks set to be deleted are counted to obtain the number of deletions.

Step 53, judge whether the deletion number obtained in step 52 reaches the retransmission selection threshold, if yes, request retransmission from the sender, otherwise execute step 54.

The retransmission selection threshold is determined according to the verification capability of the erasure correction code, for example, the retransmission selection threshold may be set as the number of check bits of the erasure correction code. If the number of deletions is less than the retransmission selection threshold, it indicates that although some received blocks have been deleted, the sending data can be correctly restored by using the erasure correction coding and decoding technology, then step 54 is performed to continue the erasure correction decoding; if the number of deletions is greater than or equal to the retransmission If the transmission selection threshold is exceeded, it indicates that the number of deleted received blocks has exceeded the erasure correction capability of the erasure correction coding and decoding technology, and the sent data cannot be restored correctly, so retransmission is required.

Here, the feedback retransmission request may be a request to retransmit the entire sent data, or a request to retransmit deleted blocks.

Step 54: Use the same erasure code as that of the sender to perform erasure correction decoding on the received block that has not been deleted, and restore the sent data.

The specific operation of this step is: perform erasure correction decoding on each column in all the undeleted receiving blocks arranged in parallel, and perform parallel/serial conversion on the decoding result as the sending data. For example, in the first column as shown in Figure 5, the data of n (K<n≤N) bytes in the first column is corrected and erased, and the decoding results are arranged vertically; the same correction is performed on all columns. Deletion decoding, all the decoding results arranged vertically form a matrix, each row in the matrix is regarded as a data block, and all data blocks are converted to parallel/serial as sending data.

So far, the processing flow of the method for receiving selective data retransmission in this embodiment ends.

In this embodiment, specific operations when short codes are used as erasure correction codes are introduced. Among them, at the sending end, the data is divided into blocks first, and then the erasure correction coding is performed in units of columns; at the receiving end, the data after CRC error detection is also subjected to erasure correction decoding in units of columns, and then parallel/serial conversion is performed. Revert sent data.

Embodiment two:

In this embodiment, the erasure correction code used is a long code, such as an LDPC code, and the error detection code used is a CRC code.

FIG. 6 is a schematic diagram of a specific flow of the method for sending selective data retransmission in Embodiment 2. As shown in Figure 6, the method flow includes:

Step 61, perform erasure correction coding on the sent data, and append the check digit generated by the coding to the sent data.

Since the erasure correction code of the long code is used in this embodiment, the erasure correction coding can be directly performed on the entire sent data without pre-blocking the data. Of course, if other factors are considered, it is entirely possible to perform data block first and then perform erasure coding, then perform erasure coding according to the method in Embodiment 1. That is to say, for erasure coding of long codes, erasure coding can be directly performed on the entire sent data, or data can be divided into blocks and then erasure coding can be performed one by one.

Step 62, block the erasure coded data to form multiple parallel blocks.

The specific block size can be determined according to the transmission status of the channel, retransmission requirements, etc., and the specific method can use an existing implementation method, which will not be repeated here.

Step 63, perform horizontal CRC encoding on each block, and add CRC check bits.

Step 64, perform parallel/serial conversion on the parallel blocks, and output them after channel processing.

So far, the processing flow of the method for sending selective data retransmission ends.

At the receiving end, reverse processing is performed opposite to that at the sending end. The specific flow of the specific receiving method is shown in Figure 7, including:

Step 71: Perform the inverse processing on the received data as opposed to the channel processing at the sending end, and perform serial/parallel conversion on the processing result in units of CRC coded blocks at the sending end to form receiving blocks.

Step 72: Carry out horizontal CRC error detection on each received block, remove the CRC parity bit, delete the block and perform deletion counting for any block that has an error, and delete the block for any block that does not have an error. Chunking is set to correct.

Step 73, judge whether the deletion number obtained in step 72 reaches the retransmission selection threshold, if yes, request retransmission from the sender, otherwise execute step 74.

The operations of the above steps 71-73 are the same as the operations of steps 51-53 in the first embodiment, and will not be repeated here.

Step 74: Use the same erasure code as that used by the sender to perform erasure correction decoding on the received block that has not been deleted to restore the sent data.

The specific operation of this step is: perform parallel/serial conversion on all undeleted receiving blocks arranged in parallel, perform erasure correction decoding on the parallel/serial conversion result, and use the decoding result as the sending data.

So far, the processing flow of the method for receiving selective data retransmission in this embodiment ends.

In this embodiment, the specific operation when the erasure correction code adopts the long code is introduced. Among them, at the sending end, first perform erasure correction coding on the sent data, and then block the encoded data; at the receiving end, perform parallel/serial conversion on the data after CRC error detection, and then perform erasure correction decoding, and parallel processing. Restore sent data after / string conversion.

The above-mentioned method of the present invention can be on the transmitting end and the receiving end of the communication system, on the basis of physical layer access technologies such as WCDMA, CDMA2000, TD-SCDMA, WiMAX, 3GPP LTE, IMT-Advanced, etc., will need cascaded The codec of the erasure correction code is set as an outer coder and the outer decoder is cascaded to the communication system, and the judgment of the erasure position is realized through error detection technology, such as CRC error detection coding. Specifically, in the realization of the communication system, the technology of the present invention can be placed on the physical layer of the communication system to cooperate with the HARQ hybrid retransmission technology, or can be placed on the high layer of the communication system to cooperate with the ARQ retransmission technology.

Taking the cooperation of the method of the present invention and the HARQ hybrid retransmission technology as an example, a specific example of realizing the present invention is given below. FIG. 8 is a schematic diagram of this example, wherein the method of the present invention is applied to a 3GPP wireless communication system using a Turbo codec, and RS codes are used as erasure correction codes.

At the sending end, the data is serially/parallel converted to form a group of data blocks, which form the input information bit data blocks of the outer encoder, and a RS code is cascaded as an outer encoder to encode the transmission data. According to the aforementioned short code The processing method of the occasion is to perform CRC encoding and parallel/serial conversion of data blocks, and input the Turbo encoder at the sending end for sending processing.

At the receiving end, the Turbo decoder performs error correction processing on the received data, and performs serial/parallel conversion on the output data of the receiver to form a set of data blocks. The CRC decoder determines and deletes errors, and selects retransmission according to The number of deletions determines whether the communication system performs data retransmission. If the number of deletions is higher than the number of check digits of the RS code, a retransmission instruction is sent to the sender to perform data retransmission processing; if the number of deletions is lower than the number of check digits of the RS code, the data is directly transmitted to the RS decoding The device corrects deletion errors, corrects deleted data blocks and restores data through parallel/serial conversion.

It can be seen from the specific implementation manners and the above specific examples of the first and second embodiments of the present invention that, through the addition of erasure correction coding and coding in the present invention, data retransmission can be controlled to a certain extent, so that when an error is detected by the error detection technology , data retransmission is not necessarily required, so as to form a reasonable control over the data retransmission mechanism, effectively reduce the processing delay caused by data retransmission, and improve the system throughput performance.

The above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1, a kind of sending method of selecting type data re-transmission is characterized in that this method comprises:

The transmitting terminal utilization is entangled to delete code and is entangled the deletion coding to sending data, forms a plurality of parallel piecemeals;

The described piecemeal that entangles after deletion is encoded is carried out error detection coding respectively form the error detection coding piece, and all error detection coding pieces are carried out parallel/serial conversion;

The result of described parallel/serial conversion is carried out sending to receiving terminal after the Channel Processing.

2, method according to claim 1 is characterized in that, entangles when deleting code to short code when described, and described utilization is entangled to delete code and encoded and form a plurality of parallel piecemeals and comprise sending data:

According to entangling the code block structure that deletes code, carry out piecemeal and handle the deblocking that obtains walking abreast sending data, the number of parallel deblocking with entangle the information bit equal in length that deletes code;

Each row in the parallel deblocking are entangled the deletion coding respectively, and the check digit that produces of will encoding is attached to after the data of described row;

To form the verification piecemeal by row by all check digit that row are arranged.

3, method according to claim 2, it is characterized in that, describedly carry out error detection coding respectively and comprise:, carry out error detection coding respectively by each piecemeal in all verification piecemeals that send all deblockings that data form and form by check digit to entangling piecemeal behind the deletion coding.

4, method according to claim 1 is characterized in that, entangles when deleting code to long code when described, and described utilization is entangled to delete code and encoded and form a plurality of parallel piecemeals and comprise sending data:

Entangle the deletion coding to sending data, after the check digit that coding is produced is attached to described transmission data, and the data that will entangle behind the deletion coding carry out piecemeal, form a plurality of parallel piecemeals.

5, method according to claim 4 is characterized in that, describedly carries out error detection coding respectively and comprises entangling piecemeal behind the deletion coding: entangle each parallel piecemeal that deletion coding back forms and carry out error detection coding respectively described.

According to arbitrary described method in the claim 1 to 5, it is characterized in that 6, described error detection coding is the cyclic redundancy check (CRC) coding.

7, a kind of method of reseptance of selecting type data re-transmission is characterized in that this method comprises:

Receiving terminal carries out contrary handle opposite with the Channel Processing of transmitting terminal to receiving data, is that unit carries out serial/parallel conversion with result with the error detection coding piece of transmitting terminal, forms and receives piecemeal;

Each is received piecemeal carry out error detection respectively, and the reception piecemeal that goes wrong is counted and deleted, obtain deleting number;

Judge whether described deletion number reaches re-transmission and select thresholding, if, then to the transmitting terminal request retransmission, not deleted reception piecemeal is entangled deletion decoding otherwise utilize entangle identical to delete code with transmitting terminal, reduce and send data.

8, method according to claim 7 is characterized in that, entangles when deleting code to short code when described, describedly not deleted reception piecemeal is entangled deletion decoding reduction sends data and comprises:

All of parallel arranged are not deleted each row that receives in the piecemeal entangle deletion decoding respectively, decode results is carried out after the parallel/serial conversion as the transmission data.

9, method according to claim 7 is characterized in that, entangles when deleting code to long code when described, describedly not deleted reception piecemeal is entangled deletion decoding reduction sends data and comprises:

All of parallel arranged are not deleted receive piecemeal and carry out parallel/serial conversion, and parallel/serial transformation results is entangled deletion decoding, with decode results as sending data.

According to arbitrary described method in the claim 7 to 9, it is characterized in that 10, it is the described check digit number that deletes code of entangling that thresholding is selected in described re-transmission.

11, a kind of transmitting apparatus of selecting type data re-transmission is characterized in that this equipment comprises:

Entangle the deletion coding unit, be used for utilizing entangling to delete code and entangle the deletion coding, form a plurality of parallel piecemeals sending data;

Detect coding unit, be used for that the described piecemeal that entangles the output of deletion coding unit is carried out error detection coding respectively and form the error detection coding piece;

Parallel/serial converter unit is used for all error detection coding pieces of described detection coding unit output are carried out parallel/serial conversion;

Channel bank is used for the data of described parallel/serial converter unit output are carried out sending after the Channel Processing.

12, a kind of receiving equipment of selecting type data re-transmission is characterized in that this equipment comprises:

Channel bank is used for carrying out contrary handle opposite with the Channel Processing of transmitting terminal to receiving data;

Serial/parallel converter unit, being used for the contrary result of described channel bank output is that unit carries out serial/parallel conversion with the error detection coding piece of transmitting terminal, forms the reception piecemeal;

The error detection unit is used for each reception piecemeal of described serial/parallel converter unit output is carried out error detection respectively, and the reception piecemeal that goes wrong is counted and deleted, and obtains deleting number;

Retransmit selected cell, whether the deletion number that is used to judge the output of described error detection unit reaches to retransmit is selected thresholding, to the transmitting terminal request retransmission, entangles the deletion decoding unit and entangles deletion and decipher otherwise trigger when reaching this re-transmissions and select thresholding;

Entangle the deletion decoding unit, be used under the triggering that retransmits selected cell, the not deleted reception piecemeal in described error detection unit is entangled deletion decoding, reduction sends data.

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