Sidelink Feedback Scheduling for Resource Collision Handling
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Solution Overview
Problem
In wireless communication systems, sidelink user equipment (UE) faces challenges in handling resource collisions during sidelink feedback transmission occasions, leading to potential interference and increased latency due to overlapping feedback resources for multiple messages.
Innovation Solution
The UE determines a type of feedback to provide based on the types of feedback to be sent and the availability of additional sidelink feedback transmission occasions, using methods such as discontinuous transmission (DTX), positive acknowledgment (ACK), or negative acknowledgment (NACK) to minimize collisions and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE transmits feedback for multiple sidelink messages in the same feedback transmission occasion, then the feedback transmission efficiency is improved, but resource collisions and interference occur between feedback transmissions
Solution Approach 1:
The feedback transmission is segmented into multiple transmission occasions. When a collision is detected between feedback for multiple sidelink messages, the UE divides the feedback transmissions across different occasions, transmitting some feedback in the current occasion and deferring other feedback to subsequent occasions, thereby avoiding resource collisions while maintaining efficient feedback transmission
Solution Approach 2:
The UE dynamically determines the feedback transmission strategy by evaluating the collision status between feedback resources. Based on the detected collision, the UE adaptively selects which feedback to transmit in the current occasion and which to defer, making dynamic adjustments to optimize both transmission efficiency and collision avoidance
2Loss of time
If the UE transmits all feedback messages in the same feedback transmission occasion, then the latency is reduced, but the reliability of feedback transmission deteriorates due to collisions
Solution Approach 1:
The UE transmits only a subset of feedback messages in the current feedback transmission occasion when collisions are detected, rather than attempting to transmit all feedback simultaneously. This partial transmission approach ensures reliable delivery of critical feedback while deferring less time-sensitive feedback to subsequent occasions
Solution Approach 2:
The UE performs preliminary detection of resource collisions before transmitting feedback. By identifying potential collisions in advance, the UE can pre-determine which feedback to transmit and which to defer, ensuring reliable transmission without incurring additional latency from reactive collision handling
3Quantity of substance
If the UE transmits feedback for multiple messages with overlapping time and frequency resources, then the feedback transmission overhead is reduced, but the likelihood of collision increases
Solution Approach 1:
The UE changes the transmission parameters (time occasion, frequency resources) for deferred feedback messages. When a collision is detected, the UE selects alternative transmission parameters for some feedback messages, shifting them to different time occasions or frequency resources to avoid collisions while maintaining efficient resource utilization
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. In some systems, a user equipment (UE) may receive a first sidelink message associated with a sidelink feedback transmission occasion and a second sidelink message also associated with the sidelink feedback transmission occasion. The UE may provide a type of feedback information via the sidelink feedback transmission occasion based on the first sidelink message and the second sidelink message both being associated with the sidelink feedback transmission occasion. The provided type of feedback information may be based on a quantity of one or more additional sidelink feedback transmission occasions subsequent to the sidelink feedback transmission occasion that are also available for transmission of either first feedback associated with the first sidelink message or second feedback associated with the second sidelink message.