Sidelink UE Capability Identification via PC5-RRC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In V2X sidelink communications, identifying the user equipment (UE) capability of a destination UE is uncertain due to the correspondence relationship between cast modes and layer-2 identities, particularly in NR V2X, where multiple unicast services or links may use identical or different source L2 IDs, leading to ambiguity in source and destination identities.
Innovation Solution
A method and apparatus that utilize specific UE identities such as layer 2 identities, identity pairs of source and destination L2 identities, access stratum identities, and PC5-RRC message identities to identify the UE capability of a destination UE, facilitating effective UE capability identification and configuration management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple unicast services or links between two UEs use identical source L2 IDs, then the correspondence relationship between cast modes and layer-2 identities becomes ambiguous, but this leads to uncertainty in identifying destination UE capability
Solution Approach 1:
The patent introduces an intermediary mechanism - the PC5-RRC message - that carries explicit destination UE capability information. Instead of relying solely on ambiguous L2 ID correspondence, the system uses this intermediary message to transfer capability data from destination UE to source UE, resolving the identification uncertainty while maintaining cast mode flexibility
Solution Approach 2:
The patent implements a feedback mechanism where the destination UE sends capability information back to the source UE through PC5-RRC messages. This feedback loop allows the source UE to acquire accurate destination UE capability data, enabling proper configuration decisions despite the ambiguity in L2 ID to cast mode mapping
2Reliability
If the system stores UE capability information in UE contexts, then capability identification is enabled, but the complexity of managing multiple identities and correspondence relationships increases
Solution Approach 1:
The patent extracts the capability identification function from the complex UE context management system. By using PC5-RRC messages to carry explicit capability information, the system separates the capability data storage and transmission function from the identity mapping complexity, reducing the burden on the UE context management mechanism
Solution Approach 2:
The patent changes the parameter used for capability identification from indirect L2 ID-based inference to direct capability information parameters carried in PC5-RRC messages. This parameter change simplifies the identification process by using explicit capability fields rather than complex identity correspondence relationships
Data Source
AI summary
A method and apparatus for identifying a user equipment capability in sidelink transmission. A UE capability of a destination UE is identified by using a specific UE identity, and a transmitting end UE is facilitated to provide configuration not exceeding a UE capability according to the UE capability of a destination UE and maintain information on the destination UE, thereby providing a mechanism for identifying a UE capability.