Sidelink Resource Allocation for RRC Inactive UEs
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Solution Overview
Problem
Next-generation wireless networks face challenges in efficiently managing sidelink radio resource allocation, particularly for user equipment (UE) in RRC Inactive states and during exceptional conditions, where existing methods lack effective solutions for seamless communication and resource management.
Innovation Solution
The method involves dedicated sidelink radio resource allocation through RRC signaling, including configured grant resources and exceptional pools, allowing UEs to autonomously select resources and maintain communication even in RRC Inactive states and exceptional conditions, such as beam failures or radio link failures, by pre-configuring Exceptional SL-Pools for continued operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated sidelink radio resource allocation through RRC signaling is implemented, then network control and reliability are improved, but signaling overhead and device complexity increase
Solution Approach 1:
The base station pre-configures exceptional sidelink resource pools and parameters to UEs before they enter RRC Inactive state. This preliminary configuration enables UEs to autonomously select and use appropriate resources during exceptional conditions without requiring real-time network signaling, thus improving reliability while reducing signaling overhead during actual exceptional events.
Solution Approach 2:
UEs are empowered to autonomously select resources from the pre-configured exceptional sidelink resource pools and determine when to activate them based on detected exceptional conditions. This self-service mechanism eliminates the need for continuous network control signaling while maintaining reliable resource allocation during exceptional events.
2Reliability
If UEs autonomously select resources from pre-configured pools, then communication continuity during exceptional conditions is improved, but resource allocation efficiency and network coordination deteriorate
Solution Approach 1:
The base station provides different UEs with customized exceptional sidelink resource pool configurations tailored to their specific service requirements, traffic patterns, and channel conditions. This local optimization ensures that each UE has appropriate resources for its needs while maintaining overall network efficiency through targeted rather than uniform resource allocation.
Solution Approach 2:
The base station configures multiple exceptional sidelink resource pools with different parameters (time resources, frequency resources, modulation schemes, coding rates) to accommodate varying service requirements. UEs can select and adapt parameters based on current channel conditions and service needs, optimizing resource allocation efficiency while maintaining communication continuity.
3Adaptability or versatility
If multiple exceptional sidelink resource pools with different parameters are configured, then adaptability to various exceptional conditions is improved, but configuration complexity and management overhead increase
Solution Approach 1:
The exceptional sidelink resource allocation is segmented into multiple independent resource pools, each optimized for specific types of exceptional conditions (e.g., beam failure, radio link failure, different service requirements). This segmentation allows UEs to select only the relevant pools needed for their specific scenarios, reducing the effective complexity they must manage while maintaining high adaptability across different condition types.
Solution Approach 2:
The exceptional sidelink resource pool configuration framework is designed to be universally applicable to all UE types and all exceptional condition scenarios. A single configuration mechanism handles diverse requirements through parameter variations, eliminating the need for separate specialized configurations for each condition type and thereby reducing overall configuration complexity.
Data Source
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AI summary
A method for a first user equipment (UE) to exchange one or more sidelink packets with a second UE. The method receives, from a serving base station, a sidelink resource allocation configuration that includes i) one or more sidelink resource configurations on one or more sidelink frequency carriers, and (ii) data identifying a valid area of the sidelink resource configurations. The method determines, based on the data identifying the valid area, whether the first UE is located within the valid area. If the method determines that the first UE is located within the valid area, the method exchanges the one or more sidelink packets with the second UE based on the received sidelink resource allocation configuration, otherwise, the method stops exchanging the one or more sidelink packets, on one or more sidelink resources indicated by the sidelink resource configurations, with the second UE.