HARQ Index-Based PPDU Aggregation for WLAN Buffer Management
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face inefficiencies in data transmission and error correction, particularly in the hybrid automatic repeat request (HARQ) process, which affects throughput and buffer management.
Innovation Solution
The proposed method involves a receiving station (STA) using HARQ index numbers to manage and retransmit Physical Protocol Data Units (PPDUs) efficiently, incorporating error detection and correction mechanisms within the EHT standard, allowing for improved error handling and data combination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ retransmission is performed for each data block separately, then error correction reliability is improved, but transmission overhead and processing complexity increase
Solution Approach 1:
The patent combines multiple data blocks with the same HARQ index into a single PPDU transmission unit. Instead of managing separate buffers for each data block, the receiving STA aggregates multiple data blocks (first data block and second data block) that share the same HARQ index into one buffer location, reducing buffer management complexity while maintaining error correction capability through combined retransmission requests.
2Productivity
If HARQ index is included in control field, then retransmission efficiency is improved, but control field complexity increases
Solution Approach 1:
The HARQ index in the control field serves multiple functions: it identifies the HARQ process, groups multiple data blocks that can be retransmitted together, and enables the receiving STA to manage buffers efficiently. By making the HARQ index multi-functional, the patent reduces the need for separate control mechanisms while improving retransmission efficiency.
3Productivity
If multiple data blocks are transmitted in one PPDU, then throughput is improved, but error detection and correction complexity increases
Solution Approach 1:
The patent segments the error handling process by using HARQ indices to group data blocks. Each HARQ index acts as a segment identifier that allows the receiving STA to manage error detection and correction for multiple data blocks independently through unified buffer management, reducing the overall complexity compared to handling each block separately.
Data Source
AI summary
A receiving STA can receive a first PPDU including a first data block and a second data block in a wireless local area network system according to various embodiments. The first data block and the second data block can be configured by a first index. Afterward, the receiving STA can transmit a retransmission request signal for the first data block. The receiving STA can receive the first data block again. Then, the receiving STA can combine the first and second data blocks configured by the first index.