Sidelink RTT Positioning Resource Allocation for Multi-UE Accuracy
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in efficiently performing device-to-device positioning and location management due to limited resource allocation and feedback mechanisms for RTT-based sidelink positioning.
Innovation Solution
Implementing a sidelink location management function (LMF) that allocates resources for RTT positioning procedures between UEs, transmits positioning requests and activation commands, and receives feedback to derive the location of UEs, using sidelink PRS and SRS signals, along with UE configurations for single or double-sided RTT procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTT positioning procedures are implemented between UEs, then positioning accuracy is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where UEs report positioning status and resource usage information back to the network. This enables dynamic adjustment of resource allocation based on actual positioning needs, resolving the contradiction between achieving high positioning accuracy through multiple RTT procedures and managing the complexity of resource allocation.
Solution Approach 2:
The patent employs dynamic resource allocation strategies where available resources are adjusted in real-time based on positioning requests and network conditions. This dynamic approach allows the system to allocate sufficient resources for accurate positioning when needed while avoiding excessive resource consumption during normal operation.
2Reliability
If multiple UEs participate in RTT positioning, then positioning reliability is improved, but system overhead increases
Solution Approach 1:
The patent combines multiple RTT positioning measurements from different UEs into a unified positioning solution. By merging the results from multiple participants, the system achieves higher reliability through cross-validation while managing overhead through efficient data fusion techniques that avoid redundant information processing.
Solution Approach 2:
The system uses feedback mechanisms to optimize the participation of multiple UEs in positioning procedures. Based on feedback about measurement quality and resource usage, the system dynamically adjusts which UEs participate in each positioning session, ensuring reliable positioning while minimizing unnecessary system overhead.
3Measurement precision
If positioning activation requests are transmitted to UEs, then positioning accuracy is improved, but response time increases
Solution Approach 1:
The patent implements preliminary actions where the network pre-configures positioning parameters and activates positioning capabilities in advance. This allows UEs to be ready for immediate positioning operations when needed, reducing the response time between activation requests and actual positioning execution while maintaining accuracy through pre-established configuration.
Data Source
AI summary
Apparatuses, systems, and methods for RTT based sidelink positioning, e.g., in 5G NR systems and beyond. A UE may receive, from a sidelink LMF, a positioning information request that may be a LPP or an NRPPa positioning information request. The UE may receive, from the SL-LMF, an indication of resources allocated for an RTT positioning procedure between the UE and one or more additional UEs. The resources may be allocated for transmission of sidelink PRSs and/or sidelink SRSs. Additionally, the UE may perform, based on the indication of resources, resource allocation for the RTT positioning procedure with the one or more additional UEs. Further, the UE may receive, from the SL-LMF, a positioning activation request and transmit a positioning activation response. The UE may then perform the RTT positioning procedure, which may be any of a single sided RTT/multi-RTT positioning procedure or a double sided RTT/multi-RTT positioning procedure.