Sidelink Interference Mitigation for 5G Positioning Accuracy
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Solution Overview
Problem
The near-far problem in 5G NR sidelink communications causes positioning interference, leading to inaccurate position estimates due to co-channel interference between positioning reference signals (PRS) and foreign control signals.
Innovation Solution
A collaborative framework among neighbor devices allows the coexistence of positioning and communication services by identifying interfering channels and utilizing sidelink connections to share interference information, enabling the target UE to suppress interference and perform accurate positioning measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If positioning reference signals (PRS) and foreign control signals use the same frequency resources, then spectrum utilization is improved, but positioning accuracy deteriorates due to co-channel interference
Solution Approach 1:
The patent introduces a location server as an intermediary entity that coordinates between positioning operations and foreign communication signals. The location server receives interference information from UEs, identifies interfering signals, and manages resource allocation to mitigate co-channel interference while maintaining spectrum utilization efficiency.
Solution Approach 2:
The system implements a feedback mechanism where UEs report interference measurements and channel state information to the location server. This feedback enables the location server to adjust positioning reference signal resources and power levels dynamically, resolving the contradiction between spectrum utilization and positioning accuracy.
2Measurement precision
If the target UE uses advanced positioning receiver capabilities to suppress interference, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The location server acts as an external intermediary that performs interference management functions, relieving the target UE from implementing complex interference suppression capabilities. The location server processes interference information and coordinates resource allocation, allowing the UE to maintain simpler receiver architecture while achieving accurate positioning.
3Measurement precision
If the target UE implements interference suppression mechanisms, then positioning accuracy is improved, but processing time and computational resources increase
Solution Approach 1:
The system performs interference identification and resource coordination in advance through the location server, before the target UE performs positioning measurements. By pre-managing interference conditions and coordinating signal resources, the UE can execute measurements more quickly without requiring complex real-time interference suppression processing.
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 that a first user equipment is likely to experience positioning interference; identifying one or more radio channels causing the interference as interfering channels; causing selection of one or more other user equipment, which have been determined to monitor at least one of the identified one or more interfering channels; based on the examination instructing one or more of the existing one or more other user equipment to obtain information of one or more of the interfering channels; obtaining information of the selected one or more other user equipment; providing the information of the selected one or more other user equipment to the first user equipment for establishing a sidelink connection with the selected one or more other user equipment and for receiving information of the one or more interfering channels; instructing the first user equipment to perform positioning measurements; and receiving information of the positioning measurements from the first user equipment.