Sidelink Wireless Communication Feedback Priority Mechanism
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Solution Overview
Problem
In wireless communication systems, particularly in V2X and Half-Duplex scenarios, the inability of UE to consistently send ACK/NACK feedback due to limited transmitting capability leads to Radio Link Failures (RLF) when feedback is not received within a certain time frame.
Innovation Solution
A method where a first node accumulates the number of failed ACK/NACK transmissions and adjusts the priority of subsequent feedback transmissions based on this count, determining whether to send ACK/NACK jointly according to the accumulated number and priority, thereby reducing unnecessary RLFs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback mechanism is enabled in NR V2X unicast transmissions, then data transmission robustness is improved, but transmitting capability limitations cause feedback transmission failures leading to Radio Link Failures
Solution Approach 1:
The patent changes the parameter of feedback transmission by introducing a priority mechanism and a counter-based decision system. The Rx UE adjusts the priority of HARQ feedback based on the counter value, which tracks the number of missed feedback transmissions. When the counter exceeds a threshold, the feedback priority is increased to ensure timely delivery, resolving the contradiction between maintaining reliability and operating within transmitting capability limitations.
Solution Approach 2:
The patent introduces dynamic adjustment of feedback transmission priority based on the counter value. The system transitions from static feedback transmission to dynamic priority adjustment, where the counter tracks missed feedback instances and triggers priority escalation. This dynamic mechanism allows the system to adapt to varying transmission conditions and prevent RLF while respecting UE transmitting capability limits.
2Adaptability or versatility
If multiple transmitting requests coexist or multiple transmitting requests occur simultaneously, then communication versatility is improved, but the Rx UE cannot send ACK/NACK feedback due to transmitting capability limits
Solution Approach 1:
The patent implements a feedback mechanism where the Rx UE monitors its own feedback transmission status using a counter. When the counter indicates missed feedback transmissions, the system adjusts the priority of subsequent feedback transmissions. This self-monitoring and adaptive feedback mechanism ensures that even under multiple transmitting requests, the system can maintain feedback reliability by dynamically prioritizing critical feedback transmissions.
3Measurement precision
If the Tx UE waits for ACK/NACK feedback for multiple times, then data transmission accuracy is improved, but unnecessary Radio Link Failures are triggered at the Tx UE side
Solution Approach 1:
The patent implements a feedback mechanism where the Rx UE monitors its own feedback transmission status using a counter. When the counter indicates missed feedback transmissions, the system adjusts the priority of subsequent feedback transmissions. This self-monitoring and adaptive feedback mechanism ensures that even under multiple transmitting requests, the system can maintain feedback reliability by dynamically prioritizing critical feedback transmissions.
Solution Approach 2:
The patent applies preliminary action by having the Rx UE proactively adjust the priority of HARQ feedback before potential transmission failures occur. The counter mechanism anticipates feedback transmission issues by tracking missed feedback instances and preemptively increasing priority, preventing RLF before it happens rather than reacting after multiple wait cycles.
Data Source
AI summary
The present disclosure provides method and device for wireless communications in sidelink. A first node receives a first signaling and a first radio signal, the first signaling indicating a first priority; determines whether to transmit a second signaling jointly according to a current value of a first counter and the first priority; when determining to transmit the second signaling, transmits the second signaling and updates the first counter's value with an initial value; when determining not to transmit the second signaling, drops transmitting the second signaling and updates the first counter's value by 1; herein, the first signaling comprises configuration information of the first radio signal. The present disclosure addresses the RLF triggered by the data-transmitting device due to the influence of the Half Duplex and/or transmitting capability of the V2X UE, thus enhancing the link robustness.