WLAN HARQ Feedback Mapping by PSDU Length for Selective Retransmission
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems face inefficiencies in hybrid automatic repeat request (HARQ) operations due to the lack of a method for distinguishing data blocks for retransmission, leading to increased feedback overhead and buffer management challenges.
Innovation Solution
A method for a receiving station (STA) to determine the number of data blocks related to feedback bits based on the length of the Physical Service Data Unit (PSDU) in a PPDU, allowing efficient identification and retransmission of specific data blocks, thereby reducing feedback overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the receiving STA requests retransmission of only a portion of data using feedback bits, then the retransmission efficiency is improved, but the method for distinguishing data blocks related to feedback bits becomes complex
Solution Approach 1:
The data is divided into multiple data blocks, each associated with specific feedback bits. The receiving STA determines which data blocks correspond to each feedback bit based on the PSDU length, enabling selective retransmission of only the failed blocks rather than retransmitting all data.
Solution Approach 2:
The transmitting STA pre-organizes the data into blocks and establishes the mapping between feedback bits and data blocks before transmission. This preliminary structuring allows the receiving STA to efficiently identify which blocks correspond to each feedback bit without complex real-time analysis.
2Reliability
If the receiving STA buffers all received data for potential retransmission, then the reliability of HARQ operation is improved, but the buffer management complexity increases
Solution Approach 1:
The buffer is logically segmented into regions corresponding to different data blocks. The receiving STA only needs to maintain buffer entries for blocks that require retransmission, rather than managing a single large buffer for all data, reducing buffer management complexity while maintaining reliability.
3Measurement precision
If the system transmits detailed feedback information for each data block, then the precision of error identification is improved, but the feedback overhead increases
Solution Approach 1:
Instead of providing comprehensive feedback for all data blocks, the system uses compact feedback bits that indicate only the necessary retransmission information. The receiving STA can identify the specific blocks needing retransmission using these condensed feedback signals, reducing feedback overhead while maintaining sufficient precision for error identification.
Data Source
AI summary
One example according to the present specification relates to a method for performing a feedback during a HARQ operation. A reception STA can determine the number of data blocks related to one from among one or more feedback bits, on the basis of the length of a PSDU. The reception STA can transmit the at least one feedback bit to a transmission STA on the basis of the number of data blocks.