Sidelink Positioning Synchronization and Resource Allocation
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Solution Overview
Problem
Current sidelink positioning methods in cellular systems, such as NR, lack defined synchronization and resource allocation techniques, leading to synchronization errors and inadequate resource management for sidelink positioning reference signals, which affect positioning accuracy and compatibility.
Innovation Solution
The implementation of systems and methods for synchronization error compensation and resource allocation for sidelink positioning, including identifying a common synchronization reference, estimating synchronization differences, and modifying the positioning procedure to accommodate varying synchronization references, as well as determining appropriate resource pools based on UE capabilities for efficient sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sidelink positioning reference signals are transmitted without defined synchronization techniques, then resource allocation can be simplified, but synchronization errors occur and positioning accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by establishing synchronization configurations and selecting synchronization references before transmitting sidelink positioning reference signals. The LMF determines positioning reference signal configurations including synchronization settings in advance, and UEs select appropriate synchronization references (GNSS, network, or sidelink) before positioning measurements, thereby preventing synchronization errors without complicating resource allocation during actual positioning operations
Solution Approach 2:
The patent introduces synchronization references as intermediary elements that mediate between different UEs performing sidelink positioning. These references (GNSS signals, network synchronization signals, or designated sidelink UEs) provide a common time reference that enables accurate time difference of arrival measurements while maintaining independent resource allocation for each UE pair, thus resolving the contradiction between simplicity and accuracy
2Measurement precision
If a common synchronization reference is enforced for all anchor UEs, then positioning accuracy improves, but system adaptability to diverse UE scenarios deteriorates
Solution Approach 1:
The patent applies dynamics by making the synchronization reference selection flexible and adaptive rather than static and uniform. Each anchor UE dynamically selects its synchronization reference based on its specific scenario - GNSS when available, network synchronization when in coverage, or sidelink synchronization when isolated. This dynamic approach maintains positioning accuracy by ensuring each UE has a valid reference while adapting to diverse operational scenarios
Solution Approach 2:
The patent changes the synchronization reference parameter individually for each anchor UE based on its operational context. Instead of fixing all UEs to a single reference type, the system allows each UE to change its synchronization reference parameter according to availability and scenario requirements, thereby maintaining both positioning accuracy and adaptability across diverse UE situations
3Device complexity
If resource pools are allocated without considering UE capabilities, then resource allocation is simpler, but communication reliability in diverse scenarios deteriorates
Solution Approach 1:
The patent applies local quality by allocating resource pools with synchronization configurations tailored to each UE's specific capabilities and scenario. The LMF determines positioning reference signal configurations locally for each target UE and anchor UE pair, considering factors like whether the UE is in network coverage, has GNSS capability, or operates in isolated mode. This localized customization ensures reliable communication for each UE without requiring complex system-wide resource allocation schemes
Data Source
AI summary
Apparatuses, systems, and methods for synchronization and resource allocation for sidelink positioning, e.g., in 5G NR systems and beyond. A device, e.g., a UE or an LMF, may be configured to transmit, to a plurality of wireless devices, an anchor selection request for a sidelink positioning procedure for a target UE. The device may be configured to receive, from one or more wireless devices of the plurality of wireless devices, an anchor selection response. The device may be configured to select based, at least in part, on the anchor selection responses, one or more anchor devices from the one or more wireless devices.