Range-Based HARQ Feedback for Groupcast Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In groupcast communication, remote users receive data packets with a lower decoding success rate due to longer distances, leading to unnecessary retransmissions that cause interference and increase feedback overheads, as the existing HARQ feedback mechanism is not effectively managed.
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 relying on real-time location coordinates, thereby reducing signaling overheads and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is performed by all receiving ends in groupcast communication, then decoding reliability is improved, but feedback overhead and unnecessary retransmissions increase
Solution Approach 1:
The patent applies local quality by making HARQ feedback behavior dependent on the receiving end's location relative to the sending end. Nearby users within a threshold distance provide HARQ feedback while remote users do not, optimizing feedback behavior locally based on spatial characteristics rather than applying a uniform rule to all users.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network device configures and provides the first information (communication range indicator or geographical zone division rule) to both sending and receiving ends. This intermediary configuration enables the terminals to autonomously determine feedback behavior without direct network control of each feedback decision, reducing signaling overhead while maintaining reliability.
2Reliability
If retransmission is performed for remote users with low decoding success rate, then decoding reliability is improved, but system performance deteriorates due to additional interference
Solution Approach 1:
The patent applies local quality by differentiating feedback behavior based on spatial location. Only receiving ends within a specified communication range or geographical zone provide HARQ feedback, while remote users outside this range do not. This localized approach ensures that retransmissions are triggered only when necessary for nearby users, avoiding unnecessary retransmissions that would cause interference to other users in the system.
3Measurement precision
If real-time location coordinates are used for HARQ feedback decision, then feedback accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent uses inexpensive, simplified location representations instead of precise real-time coordinates. It employs either a communication range indicator (a simple distance threshold) or pre-defined geographical zone division rules that terminals can evaluate locally without continuous location reporting. These lightweight mechanisms provide sufficient accuracy for HARQ feedback decisions while avoiding the high signaling overhead of real-time coordinate exchange.
Solution Approach 2:
The patent applies preliminary action by having the network device pre-configure the communication range indicator or geographical zone division rules before communication occurs. Terminals use these pre-configured parameters to autonomously determine HARQ feedback behavior based on their relative positions, eliminating the need for continuous location signaling during communication while maintaining accurate feedback decisions.
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.