Sidelink Grant Generation Using Shared COT and CAPC Matching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel access and resource allocation for sidelink communications, particularly in scenarios requiring high reliability and low latency, such as vehicle-to-everything (V2X) applications, due to the increasing demand for mobile broadband and diverse communication devices.
Innovation Solution
A method and apparatus for sidelink grant generation using shared channel occupancy time (COT) to facilitate efficient resource selection based on source and destination IDs and channel access priority class values, enabling effective sidelink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sidelink resource allocation methods are used, then device complexity is reduced, but reliability and latency performance deteriorate in V2X applications
Solution Approach 1:
The patent applies preliminary action by having the first UE select and reserve SL resources in advance within its acquired COT, then sharing this pre-selected resource pool with the second UE. The second UE performs resource selection from this pre-prepared pool, eliminating the need for complex real-time coordination during actual data transmission. This advance preparation reduces both latency and reliability issues while maintaining manageable device complexity.
Solution Approach 2:
The first UE acts as an intermediary by acquiring the COT through LBT, selecting SL resources, and then sharing these resources with the second UE via SCI messages. This intermediary approach allows coordinated resource allocation between UEs without requiring complex base station intervention, improving reliability for V2X applications while keeping device complexity acceptable through standardized procedures.
2Productivity
If channel access procedures are simplified, then device complexity is reduced, but resource allocation efficiency and latency worsen
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously perform LBT channel access procedures and independently select SL resources within their acquired COTs. Each UE serves itself in acquiring channel access and selecting resources without requiring complex network coordination, thereby improving resource allocation efficiency and reducing latency while maintaining acceptable device complexity through standardized self-service procedures.
Solution Approach 2:
The patent merges the channel access function and resource selection function into a unified COT-based framework. By combining these functions where the same UE that acquires COT also selects resources within that COT, the system achieves efficient resource allocation with reduced latency. This merging approach improves productivity while managing device complexity by consolidating related functions rather than adding separate complex coordination mechanisms.
3Reliability
If autonomous resource selection is enabled, then base station overhead is reduced, but resource allocation reliability and fairness deteriorate
Solution Approach 1:
The patent uses SCI messages as an intermediary mechanism to enable autonomous resource selection while maintaining reliability and fairness. The first UE shares its pre-selected SL resources information with the second UE through SCI, allowing both UEs to autonomously select resources without base station intervention. This intermediary information exchange ensures reliable and fair resource allocation among UEs while significantly reducing base station overhead, as the base station only needs to provide initial resource pool configuration rather than direct scheduling.
Data Source
AI summary
Provided are a method by which a first device carries out wireless communication and an apparatus supporting same. The method may comprise the steps of: receiving, from a second device via a PSCCH, first SCI for scheduling second SCI; and receiving, from the second device via a PSSCH, the second SCI including a first source ID, a first destination ID, information related to a COT, and a first CAPC value related to the COT. For example, (i) on the basis that the first source ID is matched with a second destination ID related to SL data included in available data and (ii) on the basis that a second CAPC value related to the SL data is less than or equal to the first CAPC value, an SL resource for transmission of the SL data may be selected within the COT.