Sidelink COT Sharing for Low-Latency ACK/NACK Feedback
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Solution Overview
Problem
In wireless communication networks, particularly in sidelink communication, there is a delay in acknowledging receipt of sidelink information due to the need for a receiving user equipment (UE) to wait for resources allocated by a transmitting UE, which is undesirable for certain communication scenarios.
Innovation Solution
The receiving UE identifies channel occupancy time (COT) resources based on COT system information (COT-SI) from a second transmitting UE to transmit feedback information, allowing it to use these resources for ACK/NACK transmission, even if it is not part of the original COT sharing group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the receiving UE waits for resources allocated by the transmitting UE to transmit ACK/NACK information, then the feedback transmission follows the allocated resource schedule, but the ACK/NACK latency increases and communication efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having the receiving UE identify and prepare to use COT resources from other transmitting UEs in advance. Instead of waiting passively for allocated resources, the receiving UE proactively searches for and identifies suitable COT resources from COT-SI of other transmitting UEs, enabling earlier feedback transmission and reducing ACK/NACK latency.
2Adaptability or versatility
If the receiving UE uses COT resources from a second transmitting UE to transmit feedback information, then the feedback transmission flexibility increases and latency decreases, but the resource allocation complexity increases
Solution Approach 1:
The patent applies universality by enabling COT resources to serve multiple purposes and multiple UEs. The COT resources originally allocated to a second transmitting UE are made available for use by other receiving UEs for feedback transmission. This multi-functional use of COT resources increases feedback transmission flexibility while the standardized identification process based on COT-SI keeps the complexity manageable.
Solution Approach 2:
The patent uses COT-SI (Channel Occupancy Time System Information) as an intermediary mechanism. The COT-SI contains resource information that mediates between the second transmitting UE's COT allocation and the receiving UE's feedback transmission needs. This intermediary structure simplifies the resource identification process by providing standardized, pre-formatted resource information that receiving UEs can systematically process.
Data Source
AI summary
Aspects of the present disclosure include methods, apparatuses, and computer readable media for receiving sidelink information from a first transmitting UE, receiving channel occupancy time (COT) system information (COT-SI) associated with a second transmitting UE, identifying one or more COT resources based on the COT-SI, and transmitting feedback information associated with the sidelink information via the one or more COT resources.