HARQ Block Encoding With CRC-Aided Error Detection in WLAN
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in ensuring data reliability and error correction, particularly in hybrid automatic repeat request (HARQ) operations, where existing encoding methods do not effectively utilize error detection codes to identify and correct errors in real-time transmission.
Innovation Solution
A method involving a transmitting station (STA) that configures blocks with data and cyclic redundancy check (CRC) blocks, encodes each block using Low Density Parity Check (LDPC) encoding, and transmits them together to enhance error detection and correction, allowing the receiving STA to identify erroneous units and retransmit as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CRC bits are added to each data block for error detection, then data reliability is improved, but device complexity increases due to additional encoding and processing requirements
Solution Approach 1:
The data stream is divided into multiple blocks, with CRC bits calculated and appended to each individual block. This segmentation allows error detection to be performed on a per-block basis, improving reliability while managing complexity through modular processing of smaller units rather than treating the entire data stream as one unit.
Solution Approach 2:
CRC bits are calculated and appended to each data block before the blocks are transmitted. This preliminary error detection preparation enables the receiving STA to quickly identify erroneous blocks without requiring complex post-reception analysis, thus improving reliability while keeping the processing complexity manageable through advance preparation.
2Reliability
If LDPC encoding is performed on each block with CRC bits, then error correction capability is improved, but processing time increases
Solution Approach 1:
The data is divided into multiple smaller blocks, each independently encoded with LDPC and equipped with CRC bits. This segmentation allows parallel processing of multiple blocks, reducing overall processing time while maintaining strong error correction capability through the application of LDPC encoding to each block.
Solution Approach 2:
LDPC encoding and CRC attachment are performed on each block before transmission. This preliminary encoding enables the receiving STA to perform efficient error correction using the pre-computed LDPC codes, reducing the time required for error correction processing compared to performing encoding after reception.
3Measurement precision
If CRC bits are calculated in units of HARQ units, then error detection accuracy is improved, but loss of information increases due to additional CRC overhead
Solution Approach 1:
The data is segmented into HARQ units, with CRC bits calculated for each unit. This segmentation improves error detection accuracy by enabling precise identification of which specific HARQ unit contains errors, allowing for targeted retransmission of only the erroneous units rather than retransmitting entire data streams, thus reducing overall information loss.
Solution Approach 2:
The CRC calculation is performed at the HARQ unit level rather than at the individual block level within each HARQ unit. This parameter change in the scope of CRC application improves error detection accuracy for HARQ operations while managing overhead by avoiding redundant CRC bits at the finer block level.
Data Source
AI summary
A transmission station (STA) of a wireless local area network system may configure a plurality of blocks for encoding. The plurality of blocks may each include a data block and a CRC block for detecting an error of the data block. The transmission STA encodes each of the plurality of blocks and may transmit the plurality of encoded blocks.