Sidelink Positioning via UE S-LMC Coordination
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the position of user equipment (UE) without relying on central network entities, particularly in scenarios where direct access to core networks is limited, leading to potential inaccuracies and increased signaling overhead.
Innovation Solution
Implementing sidelink-assisted positioning techniques that utilize sidelink location management components (S-LMCs) within the vehicle-to-everything (V2X) protocol layer to enable UEs to communicate directly for position determination, leveraging relative displacement and motion sensors for improved accuracy without relying on central entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If central network entities are used for position determination, then positioning coverage and network control are improved, but signaling overhead and network dependency increase
Solution Approach 1:
The positioning function is segmented between network entities and UE-side S-LMC components. The S-LMC in the target UE autonomously processes positioning requests and coordinates with other UEs' S-LMCs, dividing the centralized positioning task into distributed operations that reduce signaling overhead while maintaining positioning accuracy.
Solution Approach 2:
The S-LMC acts as an intermediary component within the UE that mediates between the application layer positioning requests and the physical layer measurements. It autonomously manages the positioning procedure by coordinating with other UEs' S-LMCs, reducing the need for direct signaling with central network entities.
2Device complexity
If direct UE-to-UE communication is used for positioning, then signaling overhead is reduced, but positioning accuracy and measurement reliability may deteriorate
Solution Approach 1:
Multiple UEs' S-LMCs merge their measurement capabilities and measurement data to collectively determine the target UE's position. By combining measurements from multiple source UEs with different spatial perspectives, the system achieves accurate positioning without requiring complex centralized processing.
Solution Approach 2:
The S-LMC components in UEs autonomously perform positioning measurements and coordinate with each other without requiring continuous network intervention. The UEs self-organize the positioning procedure, with source UEs autonomously measuring the target UE and contributing data to the position determination process.
3Measurement precision
If multiple UEs participate in position determination, then positioning accuracy is improved through multiple perspectives, but coordination complexity increases
Solution Approach 1:
The S-LMC component is designed with universal functionality that can operate in multiple roles: it can initiate positioning requests, receive and process positioning requests from other UEs, and coordinate with multiple source UEs simultaneously. This multi-functional design simplifies the coordination protocol by providing a standardized interface for all UEs to interact with the S-LMC.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to another UE, a positioning request associated with a procedure for determining a position of the UE, wherein the positioning request comprises a first sidelink communication between a first sidelink location management component (S-LMC) of the UE and a second S-LMC of the other UE, wherein the first S-LMC and the second S-LMC comprise sub-functions associated with a vehicle-to-everything protocol layer; receive, from the other UE, a second sidelink communication associated with the procedure for determining the position of the UE; and determine the position of the UE based at least in part on the second sidelink communication. Numerous other aspects are provided.