Clustered HARQ Feedback for Reliable Low-Latency Wireless Links
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Solution Overview
Problem
In wireless communication systems, especially in scenarios involving multiple terminal devices operating cooperatively, maintaining high reliability and reducing communication latency is challenging due to misalignment of working times and poor channel conditions, which affect user experience and system performance.
Innovation Solution
Implementing a HARQ mechanism that aggregates HARQ feedback within clusters of terminal devices, using a master terminal device to combine feedback from slave devices and report to the control device, and transmitting combined signals to facilitate synchronized data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HARQ feedback mechanism is used where each terminal device sends feedback individually to the control device, then each device can report its reception status, but communication latency increases and system reliability decreases due to uncoordinated retransmissions
Solution Approach 1:
The patent combines multiple terminal devices' HARQ feedback into a single cluster feedback message. The master terminal device aggregates ACK/NACK status from all slave terminal devices and sends one consolidated feedback to the control device, replacing multiple individual feedback transmissions. This merging reduces total feedback transmission time and enables coordinated blind retransmission to the entire cluster, simultaneously improving reliability through coordinated retransmission and reducing latency by eliminating sequential feedback delays.
Solution Approach 2:
The master terminal device acts as an intermediary between slave terminal devices and the control device. It collects HARQ feedback from slave devices, aggregates it into cluster-level feedback, and forwards it to the control device. This intermediary role enables centralized coordination of retransmissions while reducing the communication overhead and latency that would result from each slave device communicating directly with the control device.
2Reliability
If terminal devices operate independently without coordinated feedback aggregation, then each device can manage its own communication, but system-wide synchronization and reliability are compromised
Solution Approach 1:
The patent segments terminal devices into clusters with designated master and slave roles. This segmentation allows the system to balance complexity by localizing feedback aggregation at the cluster level rather than requiring system-wide coordination. Each cluster independently manages its own feedback aggregation, reducing overall system complexity while maintaining reliability through coordinated cluster-level retransmissions.
Data Source
AI summary
The present disclosure relates to electronic devices, methods, and storage media for wireless communications. A method is described for a control device in communication with a plurality of terminal devices, the method comprising: generating signals for the plurality of terminal devices; generating signals to be sent to the plurality of terminal devices based on the signals for the plurality of terminal devices, the signals comprising a combined signal to be sent to at least one of the plurality of terminal devices, the combined signal including all or part of signals for at least two terminal devices to facilitate signal reception by the at least two terminal devices; and sending the signals to the plurality of terminal devices.