Sidelink Positioning Protocol for Group-Based UE Location
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Solution Overview
Problem
Existing wireless communication systems lack effective methods for sidelink positioning of user equipments (UEs) in applications such as Vehicle-to-everything (V2X) communication and Public Safety first responder scenarios, where traditional UE-based and UE-assisted positioning are less useful.
Innovation Solution
Sidelink positioning is supported through the exchange of sidelink positioning messages between UEs, including sidelink positioning capabilities, resources, and measurements, with group management and network support, using a sidelink positioning protocol (SLPP) for determining location results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional UE-based positioning is used, then positioning can be performed with simple device architecture, but positioning accuracy deteriorates in V2X and public safety scenarios
Solution Approach 1:
The patent introduces location servers and base stations as intermediary entities to perform positioning calculations. Instead of relying solely on UE-based measurements, the system uses network infrastructure (location servers, base stations) to process positioning data and compute accurate locations, especially for V2X and public safety scenarios where high precision is required.
Solution Approach 2:
The patent replaces simple UE-based mechanical positioning with a more sophisticated network-assisted positioning system. The complex positioning calculations are offloaded from the UE to network entities (location servers, base stations), substituting the simple UE-based approach with a network-based computational system that provides higher accuracy.
2Measurement precision
If sidelink positioning messages are exchanged between all UEs, then positioning accuracy improves, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent merges the positioning functionality into the existing sidelink communication framework. Positioning messages are combined with regular sidelink data transmissions, and the location server consolidates positioning data from multiple UEs to perform centralized calculations, reducing the complexity individual UEs would face if they performed all calculations independently.
Solution Approach 2:
The location server acts as an intermediary that receives positioning measurements from multiple UEs and performs the complex positioning calculations. This mediator approach allows accurate positioning without requiring each UE to independently process all positioning data from all other UEs, thereby reducing individual device complexity while maintaining high positioning accuracy.
3Productivity
If group management procedures are implemented for sidelink positioning, then positioning efficiency improves for multiple UEs, but control signaling overhead increases
Solution Approach 1:
The patent implements preliminary group management procedures where UEs are pre-configured with group identifiers and positioning parameters before actual positioning occurs. The location server pre-establishes positioning configurations for groups of UEs, reducing the need for extensive real-time signaling during positioning operations.
Solution Approach 2:
The group management mechanism uses universal group identifiers and standardized positioning procedures that can be applied to multiple UEs simultaneously. The location server handles multiple UEs in a group using the same positioning configuration and calculation methods, reducing redundant signaling compared to individual UE positioning.
Data Source
AI summary
Sidelink positioning of user equipments (UEs) is supported by exchanging sidelink positioning messages between the UEs, where the messages may include sidelink positioning capabilities, sidelink positioning resources, sidelink Positioning Reference Signal (PRS) configurations, sidelink measurements and/or location results for one or more of the UEs, and may be used for determining the location results. Location results may include ranges, directions, locations, velocities, relative locations and relative velocities. Groups of UEs may be formed for sidelink positioning based on group criteria parameters that are used for determining UE inclusion or exclusion in a group, in a centralized or distributed group management procedure. Group management may additionally remove and add UEs and transfer UEs between groups. Network supported sidelink positioning may transfer sidelink positioning messages between a UE and a location server where a sidelink positioning message may be embedded in an LPP and/or SUPL message.