Sidelink Resource Collision Avoidance via SCI Feedback
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Solution Overview
Problem
In the context of LTE system enhancements for V2X services, there is a challenge in resource collision avoidance between mode 3 UEs and mode 4 UEs due to the lack of resource coordination, leading to inefficient resource utilization and potential overlap in resource allocation.
Innovation Solution
The method involves determining reserved resources on the sidelink for upcoming transmissions and transmitting this information to other UEs, using specific fields in DCI and SCI messages to indicate reserved resources and ensure that mode 4 UEs can autonomously select resources without colliding with mode 3 UE allocations, thereby avoiding resource collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource pools for mode 3 and mode 4 are configured orthogonally to avoid resource collision, then resource collision between mode 3 and mode 4 is avoided, but resource utilization efficiency deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where mode 3 UEs transmit resource reservation information through SCI messages, enabling mode 4 UEs to sense and avoid reserved resources. This feedback loop allows dynamic resource coordination without orthogonal configuration, resolving the contradiction between collision avoidance and resource utilization efficiency
Solution Approach 2:
The patent introduces SCI (Sidelink Control Information) messages as an intermediary carrier to transmit resource reservation information from mode 3 UEs to mode 4 UEs. This intermediary enables indirect communication and coordination between different modes, allowing resource sharing while avoiding collisions
2Productivity
If resource pool sharing between mode 3 and mode 4 is implemented to enhance resource utilization, then resource utilization efficiency is improved, but resource collision risk increases due to lack of coordination
Solution Approach 1:
The patent applies preliminary action by having mode 3 UEs transmit resource reservation information in advance through SCI messages before actual resource usage. This advance notification allows mode 4 UEs to proactively select non-conflicting resources, preventing collisions before they occur while enabling resource pool sharing
3Reliability
If new signaling mechanisms are introduced to enable resource coordination between mode 3 and mode 4, then resource collision avoidance is improved, but signaling overhead increases
Solution Approach 1:
The patent makes the SCI message format universal by using it for both traditional sidelink control functions and the new resource reservation indication function. By embedding resource reservation information in existing SCI structures rather than creating separate signaling protocols, the patent achieves resource coordination without significantly increasing signaling overhead
Data Source
AI summary
Method and apparatus for resource collision avoidance on sidelink are disclosed. One method of apparatus includes determining reserved resource on SL for a following SL transmission; transmitting information of the reserved resource to a mode 4 UE in a resource reservation field in SCI. Further, the reserved resource on SL is determined according to DCI received from a base station. Further, a resource guarantee indication, which indicates whether the reserved resource indicated in the resource reservation field in the SCI can be occupied by the mode 4 UE, is transmitted to the mode 4 UE.