Groupcast Feedback Mode Switching for Wireless Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling groupcast feedback communication, particularly in identifying and addressing repeated NACK feedback messages that lead to unnecessary retransmissions.
Innovation Solution
The proposed solution involves a transmitting user equipment (TX UE) that initiates groupcast communication using mode one groupcast feedback and switches to mode two based on a metric of retransmissions exceeding a threshold, allowing for monitoring of both NACK and ACK feedback messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If mode one groupcast feedback is used with NACK feedback and ACK feedback suppression, then resource consumption is reduced, but repeated NACK feedback from rogue or faulty UEs causes unnecessary retransmissions
Solution Approach 1:
The system dynamically switches between mode one and mode two groupcast feedback based on detected conditions. When rogue or faulty UEs are detected causing repeated NACK feedback, the system transitions from mode one (NACK-only feedback) to mode two (bidirectional feedback) to better manage retransmissions and improve reliability while controlling resource consumption.
2Reliability
If mode two groupcast feedback is used with monitoring of both NACK and ACK feedback, then communication reliability is improved, but resource consumption increases
Solution Approach 1:
The system changes the feedback mode parameter based on communication conditions. By monitoring retransmission metrics and detecting rogue or faulty UEs, the system adjusts between mode one and mode two feedback mechanisms, optimizing the balance between reliability and resource consumption according to current network conditions.
3Reliability
If retransmissions are performed based on NACK feedback, then data delivery reliability is improved, but the quantity of retransmissions increases when rogue UEs are present
Solution Approach 1:
The system uses feedback mechanisms to detect and respond to rogue or faulty UEs. By monitoring feedback patterns and retransmission metrics, the system identifies when mode switching is necessary to prevent inefficient repeated retransmissions while maintaining data delivery reliability for legitimate receivers.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Techniques described herein provide for a technique for a transmitting user equipment (TX UE) to handle groupcast feedback communication by starting the groupcast communication using a mode one groupcast feedback and by changing to a mode two groupcast feedback based on a metric of retransmissions exceeding a threshold. For example, the TX UE may transmit control signaling indicating mode one groupcast feedback. The TX UE may transmit a plurality of groupcast messages and may receive one or more NACK feedback messages associated with the plurality of groupcast messages. The TX UE may performs one or more retransmissions of groupcast messages based on the received NACK feedback messages. If a metric of the one or more retransmissions exceeds a threshold quantity, the TX UE may transmit second control signaling indicating the mode two groupcast feedback.