Sidelink RTT Positioning with Capability-Based UE Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in efficiently supporting high-density mobile broadband users with device-to-device communication and precise positioning, requiring improved methods for round trip time (RTT) based sidelink positioning.
Innovation Solution
UEs are configured to transmit indications of sidelink positioning capabilities, determine supporting UEs, request sidelink positioning procedures, and perform RTT measurements using acquired resources, with the option of serial or parallel PRS sequence exchanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RTT-based sidelink positioning procedures are implemented in 5G NR systems, then positioning precision is improved, but device complexity and procedure overhead increase
Solution Approach 1:
The RTT-based positioning procedure is segmented into distinct phases: capability indication, resource determination, and actual RTT measurement. Each phase handles specific tasks independently, reducing overall procedure complexity while maintaining positioning precision through structured implementation
Solution Approach 2:
UEs perform preliminary capability indication and resource determination before executing the actual RTT positioning procedure. This preliminary setup phase allows the system to prepare necessary parameters and resources in advance, simplifying the main measurement process while ensuring precise positioning capability
2Measurement precision
If multiple supporting UEs are used for multi-RTT positioning, then positioning accuracy is improved, but communication overhead and time consumption increase
Solution Approach 1:
The patent implements periodic PRS (Positioning Reference Signal) sequences exchanged between the target UE and multiple supporting UEs. This periodic structure allows efficient multi-RTT measurements by establishing regular measurement intervals, improving positioning accuracy through multiple measurements while managing time consumption through structured periodic exchanges
Solution Approach 2:
Multiple RTT measurement procedures with different supporting UEs are merged into a coordinated multi-RTT positioning framework. The target UE simultaneously or sequentially exchanges PRS sequences with multiple supporting UEs, combining measurement results to achieve improved positioning accuracy while reducing total time through parallel processing
3Reliability
If capability indication and resource determination procedures are added, then positioning reliability is improved, but system overhead increases
Solution Approach 1:
The patent extracts capability indication and resource determination as separate preliminary procedures from the main RTT positioning process. By taking out these preparatory functions, the system ensures reliable positioning capability assessment and resource allocation while managing signaling overhead through dedicated indication messages that carry only necessary information
Data Source
AI summary
Apparatuses, systems, and methods for RTT based sidelink positioning, e.g., in 5G NR systems and beyond. A UE may transmit an indication of sidelink positioning capabilities. The indication may include a round trip time (RTT) measurement capability and/or a positioning reference signal (PRS) capability. The UE may determine a supporting UE for a sidelink positioning procedure, e.g., based, at least in part, sidelink positioning capabilities of the supporting UE. Additionally, the UE may request a start of the sidelink positioning procedure to one of the supporting UE, a location management function (LMF), or sidelink LMF.