HARQ Trigger Frame Resource Allocation for Multi-User Efficiency
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Solution Overview
Problem
Hybrid automatic repeat request (HARQ) systems face inefficiencies in both poor and good signal conditions, with simple HARQ performing better in poor conditions but resulting in lower throughput in good conditions, and existing methods lack effective mechanisms for sharing and utilizing HARQ coding unit information in multi-user operations.
Innovation Solution
The method involves using trigger frames to share HARQ coding unit information and resources between access points and stations, allowing for the transmission of HARQ coded data through physical protocol data units (PPDUs), with mechanisms for acknowledging transmissions and combining re-transmissions to improve error correction in multi-user operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simple hybrid ARQ is used, then error correction performance is improved in poor signal conditions, but throughput deteriorates significantly in good signal conditions
Solution Approach 1:
The patent implements dynamic HARQ operation where the access point adapts between simple HARQ and basic ARQ modes based on real-time signal quality conditions. The system transitions from simple HARQ (better for error correction in poor conditions) to basic ARQ (better for throughput in good conditions) by monitoring signal quality and selecting the appropriate HARQ operation mode, thus resolving the contradiction between reliability and productivity across different signal environments
Solution Approach 2:
The patent changes the operational parameters of the HARQ system by introducing trigger frames that carry HARQ coding information and resource allocation. The access point modifies system behavior by sending trigger frames that instruct stations to use specific HARQ processes, coding schemes, and resource allocations, enabling flexible adaptation between different HARQ modes to optimize both error correction and throughput based on current channel conditions
2Device complexity
If HARQ coding information is not shared efficiently, then system complexity is reduced, but multi-user operation efficiency deteriorates
Solution Approach 1:
The patent implements a universal trigger frame structure that serves multiple functions simultaneously: it allocates uplink resources, conveys HARQ coding information, and coordinates multi-user transmissions. This multi-functional design enables efficient HARQ operation across multiple users without requiring separate complex signaling mechanisms for each function, thus improving multi-user efficiency while controlling system complexity through a unified framework
Data Source
AI summary
Various embodiments relate to a method for transmitting hybrid automatic repeat request (HARQ) coded data by an access point, including: receiving by the access point buffered frame information from a plurality of stations; determining the HARQ coding information and resources for each of the plurality of stations; transmitting a first trigger frame including the HARQ coding information and resource information for each of the plurality of stations; receiving a first HARQ transmission from the plurality of stations; and decoding the received HARQ transmission from the plurality of stations.