Groupcast HARQ Feedback Using Communication Range Zones
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Solution Overview
Problem
In groupcast communication, remote users with poor channel quality unnecessarily feed back negative acknowledgments (NACK), leading to unnecessary retransmissions that cause interference and increase feedback overheads, deteriorating system performance.
Innovation Solution
A range-based HARQ feedback mechanism is introduced, using communication range indicators, geographical zone division rules, and control node coverage area identifiers to determine when to perform HARQ feedback without requiring real-time location coordinates, thereby reducing signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If groupcast communication is implemented with HARQ feedback, then reliability of data transmission is improved, but remote users with poor channel quality send unnecessary NACK feedback causing increased feedback overheads and interference
Solution Approach 1:
The patent applies local quality by differentiating feedback requirements based on user location. Users within a predefined communication range of the sending end are required to send HARQ feedback, while remote users beyond this range are excluded from feedback. This spatial differentiation ensures that only users with sufficient channel quality (local area) provide feedback, eliminating unnecessary NACKs from remote users with poor channel conditions, thus reducing feedback overhead while maintaining reliability for relevant users.
2Reliability
If remote users provide HARQ feedback, then comprehensive error detection is achieved, but unnecessary retransmissions occur causing additional interference to other users
Solution Approach 1:
The patent implements local quality by establishing a spatial boundary (communication range) around the sending end. Only users located within this range are expected to provide HARQ feedback. Since users beyond this range experience poor channel quality and are unlikely to successfully decode transmissions, excluding them from feedback prevents unnecessary retransmissions. This resolves the contradiction by maintaining error detection from reliable local users while eliminating harmful retransmissions that would interfere with other users.
3Reliability
If all receiving users send HARQ feedback, then complete acknowledgment coverage is achieved, but system performance deteriorates due to increased feedback overheads and unnecessary retransmissions
Solution Approach 1:
The patent applies local quality by segmenting the receiving user population into two groups based on their distance from the sending end: local users within the communication range who are expected to successfully decode and should provide feedback, and remote users beyond this range who are not expected to succeed and should not provide feedback. This selective approach maintains adequate acknowledgment coverage from capable users while dramatically improving system performance by eliminating wasteful feedback and retransmissions from incapable remote users.
Data Source
AI summary
An information sending method, an information receiving method, a terminal, and a control node are provided. The information sending method is applied to a sending end and includes: sending first information to a receiving end; where the first information is used to assist the receiving end in determining whether to perform hybrid automatic repeat request HARQ feedback; and the first information includes at least one of the following: a communication range indicator, a correspondence between side lengths of geographical zones and communication ranges, a geographical zone division rule, and a coverage area identifier of a control node serving the sending end.