Sidelink UE Coordination Using Channel Access Conflict Indication
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Solution Overview
Problem
In sidelink communications, conflicts arise when multiple UEs reserve overlapping resources, leading to inefficiencies due to random selection based on unequal channel access probabilities, especially in unlicensed spectra.
Innovation Solution
A first UE determines a UE-B to transmit a conflict indication message based on channel access parameters like COT, CPE, and retransmissions, ensuring efficient resource reselection by the receiving UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If random selection is used to resolve resource conflicts between UEs, then the conflict resolution process is simple, but resource utilization efficiency deteriorates due to unequal channel access probabilities
Solution Approach 1:
The patent changes the parameter basis for conflict resolution from random selection to channel access parameters (COT, CPE, retransmission counts). By evaluating these parameters, the system selects the UE with the lowest channel access probability to receive the conflict indication message, thereby optimizing resource utilization while maintaining a deterministic resolution process
Solution Approach 2:
The patent enables UEs to self-evaluate their own channel access parameters and make autonomous decisions about resource reservation conflicts. Each UE can independently determine whether it should receive conflict indication messages based on its COT, CPE, and retransmission status, eliminating the need for complex centralized arbitration
2Productivity
If channel access parameters are considered for conflict resolution, then resource utilization efficiency improves, but the complexity of the conflict resolution mechanism increases
Solution Approach 1:
The patent incorporates channel access parameters (COT, CPE, retransmission counts) into the preliminary SCI messages that UEs exchange during resource reservation. This preliminary inclusion of parameter information allows for efficient conflict resolution without requiring complex real-time evaluations, as the necessary data is already available in the reservation messages
Solution Approach 2:
The patent establishes a feedback mechanism where UEs monitor channel access parameters and adjust their resource reservation behavior accordingly. The conflict indication message provides feedback to the selected UE about resource conflicts, enabling it to reselect resources based on its channel access probability relative to other UEs
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In sidelink communications, multiple user equipments (UE) smay access and utilize communications resources, sense other UEs, and coordinate utilization of resources. A conflict may occur between resource reservations of two UEs. Described techniques provide for a determined transmission by a first UE of a conflict indication message to one UEs. The first UE may account for one or more channel access parameters affecting the likelihood of the second UE and the third UE being able to access the reserved reservations when determining to which UE to transmit the conflict indication message (e.g., which UE is the UE-B). The first channel access parameter and the second channel access parameter may be based on a channel occupancy time, a channel sensing duration, a cyclic prefixed extension, and/or a number of retransmissions, associated with the first resource reservation and the second resource reservation.