A-MPDU Segmentation for HARQ Signaling Overhead Reduction
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Solution Overview
Problem
There is a need for communication apparatuses and methods that provide feasible solutions for Hybrid Automatic Repeat Request (HARQ) transmission in Extremely High Throughput (EHT) Wireless Local Area Network (WLAN) to achieve better link adaptation and higher throughput, as existing technologies have not adequately addressed HARQ transmission in this context.
Innovation Solution
The solution involves a communication apparatus that generates a transmission signal with a data field carrying an aggregated medium access control protocol data unit (A-MPDU) segmented into code blocks, where A-MPDU subframes soliciting immediate acknowledgement and those not soliciting immediate acknowledgement are not mapped into a single code block, and a method for transmitting this signal to ensure efficient HARQ operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If A-MPDU subframes are mapped into code blocks for HARQ transmission, then link adaptation and throughput are improved, but signaling overhead and complexity increase
Solution Approach 1:
The patent segments the A-MPDU into multiple code blocks, where each code block contains a specific number of A-MPDU subframes. This segmentation allows the receiver to process and provide feedback for individual code blocks independently, reducing the overall signaling overhead while maintaining high throughput through parallel transmission of multiple code blocks.
Solution Approach 2:
The patent applies different mapping strategies for different A-MPDU subframes based on their acknowledgment requirements. Subframes soliciting immediate acknowledgment are mapped to code blocks that require HARQ feedback, while subframes not soliciting immediate acknowledgment are mapped to code blocks that do not require feedback. This local differentiation optimizes the balance between throughput and signaling overhead.
2Productivity
If A-MPDU subframes soliciting immediate acknowledgement and those not soliciting immediate acknowledgement are mapped into separate code blocks, then HARQ operation efficiency is improved, but code block segmentation complexity increases
Solution Approach 1:
The patent divides the A-MPDU into code blocks with specific size constraints (each code block contains 1 to 7 A-MPDU subframes). This segmentation rule ensures that code blocks containing subframes requiring immediate acknowledgment are separated from those not requiring acknowledgment, enabling efficient HARQ operation without excessive complexity in the segmentation logic.
Solution Approach 2:
The patent uses parameter-based differentiation where code blocks are identified by whether they contain subframes soliciting immediate acknowledgment or not. This parameter change approach (acknowledgment requirement) simplifies the segmentation process compared to more complex differentiation methods, while still achieving efficient HARQ operation.
Data Source
AI summary
A communication apparatus comprising: circuitry, which, in operation, generates a transmission signal that includes a data field, the data field carrying an aggregated medium access control protocol data unit (A-MPDU) that is segmented into one or more code block; and a transmitter which, in operation, transmits the transmission signal to another communication apparatus; and wherein the A-MPDU comprises one or more A-MPDU subframe that are mapped to the one or more code block, such that an A-MPDU subframe not soliciting immediate acknowledgement and an A-MPDU subframe soliciting immediate acknowledgement are not mapped into a single code block.