NR Sidelink Positioning Interference Compensation Using Shared Channel Data
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Solution Overview
Problem
The near-far problem in New Radio sidelink (NR SL) positioning causes interference between positioning reference signals (PRS) and synchronization signal blocks (SSBs), leading to inaccurate position estimates due to co-channel interference, which existing solutions like orthogonalization are unscalable and computationally expensive.
Innovation Solution
A collaborative framework among neighboring UEs shares channel information (CI) and aggressor's transmitted information (TI) to regenerate and compensate for interference, allowing the target UE to model and mitigate the aggressor's behavior during PRS reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If orthogonalization is used to prevent interference between PRS and other signals, then interference is reduced, but the solution is unscalable and computationally expensive
Solution Approach 1:
The patent introduces a location server as an intermediary entity that collects channel information from multiple UEs and processes interference compensation centrally. Instead of each UE performing complex orthogonalization calculations, the location server acts as a mediator that gathers CI from neighboring UEs, regenerates aggressor signals, and provides compensation data back to UEs, thereby reducing individual UE computational burden while maintaining interference mitigation effectiveness
Solution Approach 2:
The patent uses channel information (CI) collected from neighboring UEs to create a copy or model of the aggressor signal characteristics. By copying the channel response data from multiple UEs and combining them, the system reconstructs the interference pattern without requiring each UE to directly measure or compute the full interference signal, reducing computational complexity while preserving accuracy
2Measurement precision
If the target UE uses advanced receiver capabilities to decode PRS in presence of strong aggressor signals, then positioning accuracy is improved, but the target UE requires complex processing that may not be available in all devices
Solution Approach 1:
The patent performs preliminary interference compensation by collecting channel information from neighboring UEs and regenerating the aggressor signal model before the target UE performs positioning measurements. The location server pre-processes the interference characteristics and provides compensation data to the target UE in advance, allowing the target UE to use simpler receiver capabilities while still achieving accurate positioning through pre-applied interference mitigation
Solution Approach 2:
The system implements a feedback mechanism where channel information from multiple UEs (including the target UE) is collected and used to improve the interference model. The location server continuously updates the aggressor signal regeneration based on feedback CI from various UEs, and this refined model is then used to compensate the target UE's measurements, creating a closed-loop system that improves positioning accuracy without increasing target UE complexity
3Measurement precision
If multiple UEs collect and share channel information via sidelink, then interference compensation accuracy is improved, but communication overhead and latency increase
Solution Approach 1:
The patent merges channel information from multiple neighboring UEs at the location server instead of requiring the target UE to collect and process all CI individually. By combining CI from multiple sources through sidelink communication and centralizing the processing at the location server, the system achieves accurate interference modeling without requiring the target UE to wait for or process all individual UE contributions, reducing effective latency while maintaining compensation accuracy
Data Source
AI summary
There is disclosed methods, apparatuses and computer program products for enhanced accuracy positioning. In accordance with an embodiment, the method comprises determining which one or more user equipment to use to obtain channel information about a network element; obtaining from the determined user equipment transmitted information of a network element; obtaining from the determined user equipment channel information of a propagation channel between the determined user equipment and the network element obtaining channel information of a propagation channel utilized by the network element; using the collected transmitted information and the channel information of the propagation channel between the apparatus and the network element to regenerate interfering signal of the network element; using the regenerated interfering signal to at least partially compensate the interfering signal from positioning reference signals; and performing positioning measurements using the positioning reference signals from which the interfering signal has been at least partially compensated.