Rate-Matching Indication Field for Sidelink Resource Efficiency
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Solution Overview
Problem
In wireless communications, especially in sidelink connections, the inefficiency in resource usage occurs when anchor UEs transmit control-only transmissions, leaving payload regions of subchannels unused, leading to reduced throughput due to unawareness of resource allocation by client UEs.
Innovation Solution
The implementation of a rate-matching indication field in sidelink control information (SCI) by anchor UEs to inform client UEs about resource allocations rate-matched around control regions, allowing efficient use of unused resources by indicating which subchannels are allocated for forward link transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anchor UEs transmit control-only transmissions, then control information is delivered to client UEs, but payload regions of subchannels remain unused reducing throughput
Solution Approach 1:
The patent enables client UEs to autonomously determine rate-matching status by monitoring rate-matching indication fields in SCI transmissions. Each client UE independently identifies whether its allocated subchannels are rate-matched around control regions, allowing the system to utilize previously unused payload regions without requiring anchor UE intervention for each resource allocation decision.
Solution Approach 2:
The patent introduces rate-matching indication fields as new signaling parameters in SCI transmissions. These fields convey information about control region locations and rate-matching status, enabling client UEs to adjust their resource allocation strategies dynamically. The indication fields can be transmitted in first-stage or second-stage SCI, providing flexible parameter communication without changing the fundamental control-only transmission structure.
2Reliability
If resource allocations are rate-matched around control regions, then resource conflicts are avoided, but resource utilization efficiency decreases
Solution Approach 1:
The patent segments the subchannel into distinct control regions and payload regions. Control regions contain SCI transmissions while payload regions can be allocated for forward link data transmissions. By clearly delineating these segments and providing rate-matching indications, the system avoids resource conflicts between control and data transmissions while maximizing payload region utilization.
Solution Approach 2:
The rate-matching indication fields provide feedback information from the anchor UE to client UEs about the rate-matching status of allocated subchannels. This feedback enables client UEs to correctly interpret their resource allocations and apply appropriate rate-matching procedures, ensuring reliable communication while efficiently utilizing available resources.
Data Source
AI summary
Abstract: Methods, systems, and devices for wireless communications are described. In some sidelink communications systems, an anchor user equipment (UE) may allocate a set of subchannels to a client UE for a forward link transmission from the anchor UE to the client UE. The anchor UE may use a control region of one or more subchannels of the set of subchannels allocated to the client UE for one or more control-only transmissions. The anchor UE may transmit a rate-matching indication field to the client UE to indicate a rate-matching status of the set of subchannels that are allocated to the client UE, which may indicate on which subchannels the client UE may rate-match around a control region of the subchannel to receive the forward link transmission.