UE Sidelink Resource Reselection in V2X Systems
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Solution Overview
Problem
In LTE-based vehicle-to-everything (V2X) communication systems, there is a need for efficient methods to enable user equipment (UE) to autonomously select and reselect sidelink resources for vehicle-to-everything (V2X) communication, as existing methods do not effectively manage resource reselection in dynamic environments.
Innovation Solution
A method and apparatus for UE to autonomously reselect sidelink resources by determining availability in a sidelink traffic channel, configuring resource pools by an upper layer, and randomly selecting values for a sidelink resource reselection counter, which decreases with each hybrid automatic repeat request (HARQ) transmission, allowing for dynamic selection of time and frequency resources within configured ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE autonomously selects SL resources from configured resource pools, then resource allocation flexibility and adaptability to dynamic V2X environments are improved, but resource collision and interference may increase due to random selection
Solution Approach 1:
The patent implements dynamic resource reselection through a counter mechanism (SL_RESOURCE_RESELECTION_COUNTER) that triggers periodic resource reselection. The counter is randomly initialized and decremented with each HARQ transmission, automatically triggering resource reselection when it reaches zero. This dynamic approach allows the UE to adapt to changing channel conditions and interference patterns in V2X environments while maintaining structured resource management.
Solution Approach 2:
The patent changes the resource selection parameters by randomly selecting resources from the configured resource pool and using random initialization of the reselection counter (values between 5-15). This parameter variation through randomness helps distribute resource selections across different UEs, reducing the probability of resource collisions while maintaining adaptability to dynamic conditions.
2Productivity
If resource reselection counter is randomly selected between 5 and 15, then resource utilization efficiency is improved through distributed selection, but resource selection predictability and coordination may deteriorate
Solution Approach 1:
Each UE independently manages its own resource reselection process by autonomously initializing and decrementing its SL_RESOURCE_RESELECTION_COUNTER based on its own HARQ transmission progress. This self-service mechanism allows each UE to efficiently utilize resources according to its own transmission needs without requiring continuous network coordination, improving resource utilization efficiency while maintaining distributed network operation.
3Adaptability or versatility
If SL resource reselection is triggered by counter expiration, then resource allocation adaptability is improved, but signaling overhead and control complexity may increase
Solution Approach 1:
The patent extracts the resource reselection control logic from network-based scheduling and places it in the UE's autonomous operation. By taking out the counter management function to the UE side, the system achieves adaptive resource allocation without requiring continuous network signaling for each reselection event, thereby reducing signaling overhead while maintaining adaptability.
Data Source
AI summary
In a wireless communication system, user equipment (UE) can reselect a sidelink resource used for vehicle-to-everything (V2X) communication. Reselection of a sidelink resource may be triggered by various conditions, and especially can be triggered when one or more resource pools are configured by an upper layer. In particular, the user equipment determines that data for V2X is present in a sidelink traffic channel (STCH), determines that the one or more resource pools are configured by the upper layer, and reselects the sidelink resource.