LLR Buffer Management in Wireless LAN Receive End
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Solution Overview
Problem
The HARQ technology in wireless communication systems requires the receive end to store LLRs corresponding to coded bits, leading to increased memory requirements and potential throughput issues if the data is not processed in time.
Innovation Solution
A communication method and device that discards LLRs corresponding to coded bits in a buffer based on indication information, such as BAR information or retransmission indication, allowing for timely deletion of unnecessary LLRs and reducing memory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receive end stores LLRs corresponding to coded bits for HARQ technology, then the decoding success rate is improved, but the memory requirements increase
Solution Approach 1:
The patent implements a mechanism to discard LLRs from the buffer after they have been successfully processed or when no longer needed for HARQ operations. The transmit end sends indication information (such as start sequence number and end sequence number) to inform the receive end which LLRs can be safely discarded, thereby recovering memory space while maintaining decoding reliability for active HARQ processes
2Reliability
If the receive end stores LLRs corresponding to coded bits in buffer, then the HARQ combining capability is improved, but the system throughput is affected when data is not processed in time
Solution Approach 1:
The patent introduces dynamic buffer management where the receive end adjusts the LLR buffer contents based on incoming indication information from the transmit end. The buffer is dynamically updated to retain only the necessary LLRs for current HARQ combining operations, allowing the system to adapt to varying throughput requirements while maintaining HARQ capability when needed
Solution Approach 2:
The transmit end sends indication information in advance to inform the receive end about which LLRs will be needed for upcoming HARQ operations. This preliminary action allows the receive end to prepare the buffer appropriately, ensuring that LLRs are retained only when necessary for combining, thereby optimizing both throughput and reliability
Data Source
AI summary
This application provides a communication method and device in a wireless local area network. The communication method includes: A receive end receives indication information from a transmit end, where a buffer of the receive end stores a log-likelihood ratio (LLR) corresponding to coded bits in an aggregated media access control protocol data unit (A-MPDU) subframe including a target media access control protocol data unit (MPDU). The receive end discards the LLR corresponding to the coded bits in the A-MPDU subframe including the target MPDU according to the indication information. According to the technical solutions provided in this application, the LLR corresponding to the coded bits in the buffer of the receive end can be discarded in time, thereby improving throughput of a system and reducing memory requirements.