Positioning Anchor Selection Using Beam-Specific UE Measurements
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Solution Overview
Problem
In wireless positioning, especially in out-of-coverage scenarios, selecting optimal anchor UEs for sidelink positioning is challenging due to the lack of network support, leading to potential geometric dilution of precision issues.
Innovation Solution
The target UE performs beam-specific downlink measurements and broadcasts this information via sidelink to candidate anchor UEs, allowing them to assess their suitability based on their own measurements, thereby selecting UEs in optimal relative locations for positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam-specific downlink measurements are performed and compared between target UE and candidate anchor UE, then positioning accuracy is improved, but device complexity and measurement overhead increase
Solution Approach 1:
The network pre-configures downlink reference signals (such as SSB or CSI-RS) before positioning measurements are performed. This preliminary configuration allows the reference signal structure, frequency resources, and time resources to be established in advance, enabling both the target UE and candidate anchor UE to perform consistent beam-specific measurements without requiring complex real-time signal configuration, thereby improving positioning accuracy while managing device complexity
Solution Approach 2:
The candidate anchor UE compares its beam-specific downlink measurements with those of the target UE and provides feedback indicating whether it is suitable as a positioning anchor. This feedback mechanism enables the target UE to identify optimal anchor UEs based on measurement consistency, improving positioning accuracy through selective anchor selection while avoiding the complexity of having all UEs continuously perform and report detailed measurements
2Measurement precision
If candidate anchor UEs compare their measurements with target UE measurements to determine suitability, then geometric dilution of precision is reduced, but loss of time occurs due to measurement and comparison procedures
Solution Approach 1:
Downlink reference signals are configured in advance by the network, allowing candidate anchor UEs to have measurement opportunities prepared beforehand. The reference signal configuration includes predefined time and frequency resources, so when positioning is needed, UEs can immediately perform measurements without setup delays, reducing the time loss while enabling accurate comparison-based anchor selection
Solution Approach 2:
Instead of requiring all candidate anchor UEs to perform full measurement procedures, the system allows the target UE to initiate the process by having candidate UEs compare their measurements only when needed for anchor selection. This partial action approach—where measurements are performed only by relevant UEs at relevant times—reduces overall time loss while still achieving the benefit of geometric dilution of precision reduction through measurement comparison
Data Source
AI summary
Disclosed is a method comprising receiving, by an apparatus, a first set of information associated with one or more first beams of a network element; obtaining, by the apparatus, a second set of information associated with one or more second beams of the network element by performing beam-specific downlink measurements on the one or more second beams; and determining, by the apparatus, based at least partly on the first set of information and the second set of information, whether the apparatus is in a suitable location for acting as a positioning anchor for a target user device.