NR V2X Positioning Using Sidelink PRS and Single-Reference Sync
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Solution Overview
Problem
Conventional positioning methods for UEs in wireless communication systems, such as OTDOA and E-CID, require multiple anchor nodes with known locations and additional geographical information, leading to inefficiencies and increased complexity.
Innovation Solution
A method involving a first device selecting a synchronization reference, obtaining synchronization, transmitting and receiving positioning reference signals (PRS) to determine distances with other devices, and calculating the device's location based on these distances, utilizing GNSS, BS, or UE as synchronization references.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional positioning methods (OTDOA, E-CID) are used, then positioning can be achieved, but multiple anchor nodes with known locations and additional geographical information are required, increasing system complexity
Solution Approach 1:
The patent extracts and removes the requirement for multiple anchor nodes and external geographical information from the positioning system. By using only the serving base station as a reference and leveraging UE-measured downlink signal parameters, the system eliminates the need for OTDOA's multiple TPs and E-CID's external geodatabases, thereby reducing system complexity while maintaining positioning functionality
Solution Approach 2:
The serving base station is made to serve dual purposes: both providing regular cellular service and acting as the positioning reference point. This multi-functionality eliminates the need for separate anchor nodes, as the existing base station infrastructure is utilized for both communication and positioning functions
2Loss of information
If conventional positioning methods are used, then positioning information can be obtained, but additional geographical information and UE measurements are required, increasing measurement requirements
Solution Approach 1:
The UE performs self-positioning by autonomously measuring downlink signal parameters (RSRP, RSRQ, timing advance) from the serving base station and calculating its own location using the known base station coordinates. This self-service approach eliminates the need for complex external geographical information databases and reduces dependency on network-side measurement infrastructure
3Ease of operation
If three or more anchor nodes are used for TDOA positioning, then positioning can be performed, but the requirement for multiple anchor nodes increases system overhead and deployment complexity
Solution Approach 1:
The patent extracts the essential positioning function from the multi-anchor node TDOA framework and implements it using a single serving base station. By removing the requirement for three or more anchor nodes and instead using UE-measured downlink parameters combined with known base station location, the system achieves positioning with minimal infrastructure
Solution Approach 2:
Instead of having multiple anchor nodes transmit signals for the UE to measure time differences (as in OTDOA), the patent inverts the approach by having the UE measure downlink signal parameters from the serving base station and perform the positioning calculation, thereby reducing the number of required transmit nodes from three or more to just one
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient sidelink communication by reducing the need for multiple anchor nodes and geographical information, thereby simplifying the positioning process.
Implementation Method 1
obtaining information on a sum of a first distance between the first device and the second device and a second distance between the first device and the third device, based on the first time point, a second time point at which the second PRS is received by the second device, and a third time point at which the second PRS is received by the third device
Data Source
AI summary
A method by which a first device performs wireless communication, and an apparatus supporting same are presented. The method may comprise the steps of: selecting a synchronization reference; and acquiring synchronism on the basis of a synchronization signal received from the synchronization reference. For example: the first device can receive a first PRS from a second device; the first device can transmit a second PRS to a third device; the first device can transmit the second PRS to the second device and the third device at a time point at which a threshold is added from a first time point at which the first PRS is received.