Soft Grant Sidelink Resource Re-evaluation for Mode 1 and Mode 2 Collision Avoidance
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently sharing sidelink resources between UEs operating in different modes, leading to potential collisions and interference.
Innovation Solution
The implementation of soft grants for sidelink resources, where a UE receives a soft grant indication from a base station, performs a re-evaluation to ensure the resource does not collide with reservations from other UEs, and only transmits if the re-evaluation passes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft grants are implemented for sidelink resource sharing, then resource utilization is enhanced and collisions are reduced, but device complexity increases due to re-evaluation procedures
Solution Approach 1:
The base station performs preliminary actions by pre-configuring the resource pool structure, soft grant parameters, and re-evaluation criteria before actual transmission occurs. This allows UEs to execute simpler re-evaluation procedures during operation, as the complex configuration decisions have already been made by the base station in advance
Solution Approach 2:
The system implements feedback mechanisms where the base station receives re-evaluation results from UEs and adjusts soft grant allocations accordingly. This feedback loop enables dynamic optimization of resource sharing between mode 1 and mode 2 UEs, improving collision avoidance while managing device complexity through network-coordinated control
2Reliability
If re-evaluation of sidelink resources is performed, then collision detection is improved, but time consumption increases
Solution Approach 1:
The re-evaluation procedure performs partial actions by checking only the critical collision risks for soft-granted resources rather than exhaustively validating all possible resource interactions. This selective re-evaluation approach maintains adequate collision detection capability while significantly reducing the time required compared to complete resource verification
Solution Approach 2:
The base station performs preliminary resource allocation and conflict prediction before actual transmission time, so that much of the collision detection work is completed in advance. This allows the UE re-evaluation process to focus only on final confirmation checks, reducing real-time time consumption while maintaining reliable collision detection
3Productivity
If sidelink mode 1 and mode 2 UEs share resources, then network capacity is improved, but interference increases
Solution Approach 1:
The system applies local quality by treating mode 1 and mode 2 UEs differently at the resource allocation level. Soft grants provide mode 1 UEs with prioritized access to specific resource portions, while mode 2 UEs operate in remaining resources. This differentiated local allocation improves overall network capacity while managing interference through structured resource separation
Solution Approach 2:
The base station acts as an intermediary between mode 1 and mode 2 UEs, mediating resource sharing decisions and coordinating re-evaluation processes. This intermediary control enables efficient resource utilization across both modes while minimizing interference through centralized coordination and dynamic adjustment of soft grant parameters
Data Source
AI summary
Systems, methods, and devices for wireless communication that support mechanisms for sharing of a sidelink resource pool using soft grants. A sidelink resource pool may be shared between one or more sidelink mode 1 UEs and one or more sidelink mode 2 UEs. A base station may grant one or more sidelink resources to a mode 1 transmitting UE for transmitting data to a mode 1 receiving UE, and may include an indication that at least one of the one or more sidelink resources granted is a soft granted sidelink resource that may be accessed by the mode 1 transmitting UE only after passing re-evaluation. The mode 1 transmitting UE may perform re-evaluation and may transmit over the at least one sidelink resource only if the at least one sidelink resource passes the re-evaluation.