Relay UE Identification via PC5 and Uu Identifier Segmentation
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR and LTE, lack an effective relay UE identification mechanism, leading to inefficiencies in constructing sidelink relay architectures, particularly when switching between direct and indirect links, measurement processes, and reconfiguration processes.
Innovation Solution
The method involves relay UE sending first identifier information, including a PC5 Layer-2 identifier, to a serving base station and second identifier information, including a Uu identifier, to both the serving base station and remote UE, enabling effective identification and improving relay UE recognition in various communication scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If relay UE identification mechanism is not implemented, then system complexity is reduced, but relay UE identification accuracy deteriorates
Solution Approach 1:
The patent segments the identification mechanism into two distinct identifier types: PC5 Layer-2 identifier for sidelink communication and Uu identifier for uplink communication. This segmentation allows each identifier to serve its specific communication interface, achieving accurate relay UE identification without requiring a single complex universal identification system.
2Measurement precision
If multiple identifier types are used for relay UE identification, then identification accuracy improves, but information management complexity increases
Solution Approach 1:
The patent introduces the serving base station as an intermediary that manages and coordinates both PC5 Layer-2 identifiers and Uu identifiers. The base station receives PC5 identifiers from relay UEs, allocates corresponding Uu identifiers, and maintains the mapping relationships, thereby simplifying the overall identifier management architecture despite using multiple identifier types.
Solution Approach 2:
The patent makes the serving base station a multi-functional entity that performs identifier allocation, identifier mapping, link switching control, and measurement configuration simultaneously. This universality consolidates multiple functions into a single network entity, reducing distributed complexity while maintaining accurate relay UE identification.
3Productivity
If relay UE identification is implemented, then sidelink relay architecture construction efficiency improves, but signaling overhead increases
Solution Approach 1:
The patent performs preliminary identifier allocation and mapping configuration during the relay link establishment phase. The serving base station pre-allocates Uu identifiers and establishes mapping relationships before actual data transmission begins, which streamlines subsequent communication operations and reduces signaling overhead during active relay operations.
4Measurement precision
If identifier information is exchanged between relay UE and serving base station, then relay identification accuracy improves, but communication overhead increases
Solution Approach 1:
The patent extracts and separates the identifier information exchange from the general data transmission process. Specifically, PC5 Layer-2 identifier information is extracted and transmitted through dedicated uplink signaling to the serving base station, while Uu identifier information is managed separately through downlink signaling. This extraction allows efficient, targeted identifier management without burdening the general data channel.
Data Source
AI summary
A relay identification method includes sending, by relay UE, first identifier information to a serving base station, where the first identifier information includes at least a first PC5 Layer-2 identifier of the relay UE; or sending, by the relay UE, second identifier information to remote UE. The second identifier information includes at least a Uu identifier of the relay UE, and the serving base station is a base station serving the relay UE and the remote UE.