EHT HARQ Packet Segmentation for Wi-Fi Retransmission
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Solution Overview
Problem
Current Wi-Fi systems lack support for Hybrid Automatic Repeat Request (HARQ), which is essential for improving link reliability and throughput, especially in high-throughput scenarios, due to challenges in segmenting data packets, error detection, and retransmission mechanisms.
Innovation Solution
The implementation of an EHT HARQ system that segments data packets for efficient retransmission, uses low-density parity-check (LDPC) codewords, and introduces mechanisms for selective retransmission and feedback solicitation, allowing for improved error handling and reduced processing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are segmented for HARQ retransmission, then link reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments data packets into multiple transport blocks for HARQ retransmission. Each transport block can be independently decoded and retransmitted, improving link reliability by allowing selective retransmission of only failed segments rather than retransmitting entire data packets. This segmentation enables finer-grain error recovery while managing device complexity through structured block organization.
Solution Approach 2:
The patent changes the parameter of transport block size and number to optimize HARQ operations. By dynamically adjusting the number of transport blocks and their sizes based on channel conditions and buffer status, the system improves link reliability through adaptive retransmission while controlling device complexity through parameter-based management rather than structural complexity.
2Productivity
If selective retransmission mechanisms are implemented, then throughput is improved, but processing latency increases
Solution Approach 1:
The patent implements preliminary action by pre-segmenting data into transport blocks before transmission and pre-configuring HARQ processes. This allows the receiver to immediately identify and request retransmission of only failed blocks using feedback mechanisms, improving throughput by avoiding retransmission of successfully received data while minimizing processing latency through pre-established segment structures.
Solution Approach 2:
The patent uses feedback mechanisms where the receiver sends acknowledgment information about which transport blocks were successfully decoded and which need retransmission. This selective feedback enables the transmitter to efficiently retransmit only the necessary blocks, improving throughput by reducing redundant transmissions while managing processing latency through targeted retransmission requests.
3Reliability
If error detection mechanisms are enhanced, then link reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical error detection and correction systems with simplified cryptographic hashing mechanisms. By using hash functions to generate compact error detection codes for each transport block, the system achieves reliable error detection with minimal computational complexity, improving link reliability without significantly increasing device complexity compared to traditional error correction codes.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to extremely high throughput (EHT) multiuser hybrid automatic repeat request (HARQ). A device may determine one or more medium access control (MAC) protocol data unit (MPDUs) to be sent to a first station device of one or more station devices, wherein the one or more MAC protocol data units (MPDUs) comprise a first MPDU. The device may segment the first MPDU into a plurality of segments, wherein the one or more segments include a first segment and a second segment. The device may cause to send the plurality of segments to the first station device. The device may identify a feedback frame received from the first station device, wherein the feedback frame comprises error information associated with the plurality of segments. The device may cause to retransmit at least one of the plurality of segments based on the error information.