NTN UE Location Verification with Satellite Motion Compensation
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Solution Overview
Problem
Existing wireless communication systems struggle to accurately locate user equipment (UE) in non-terrestrial networks (NTN) due to the large coverage areas and satellite movement, which complicates traditional location determination methods.
Innovation Solution
UEs and base stations in NTN systems are equipped with processors and radios to receive configurations for location reporting, perform initial measurements, and compensate for satellite movement, using multi-round-trip time (RTT) procedures and time difference of arrival (TDOA) schemes to calculate precise UE locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional location determination methods are used in NTN, then the system is simpler to implement, but location accuracy deteriorates due to large coverage areas and satellite movement
Solution Approach 1:
The network device provides configuration information to the UE in advance, including parameters for multi-RTT procedure and TDOA scheme. This preliminary configuration enables the UE to perform accurate location measurements despite satellite movement, resolving the contradiction between location accuracy and system complexity by preparing necessary data before the actual location determination process
Solution Approach 2:
The patent introduces a network device as an intermediary that coordinates between the UE and location server. The network device provides configuration information and assists in the location measurement process, enabling accurate location determination in NTN without requiring complex direct UE-server coordination, thus resolving the contradiction by adding a managing intermediary layer
2Measurement precision
If multi-RTT procedure with strict timing is used, then location accuracy is improved, but time synchronization requirements increase
Solution Approach 1:
The network device provides configuration information including timing parameters and maximum permissible time differences before the UE performs the multi-RTT procedure. This preliminary provision of timing constraints enables the UE to synchronize its measurements properly, achieving accurate location determination while managing time synchronization requirements through advance configuration
3Reliability
If satellite movement compensation is implemented, then location verification reliability is improved, but measurement and calculation complexity increases
Solution Approach 1:
The network device acts as an intermediary that provides configuration information about satellite movement compensation parameters to the UE. Rather than requiring the UE to independently calculate and compensate for satellite movement (which would increase UE complexity), the network device supplies the necessary compensation data, achieving reliable location verification while distributing complexity to the network side
Data Source
AI summary
The disclosure relates to system and method for UE location verification in non-terrestrial network (NTN). In some aspects, a base station (BS) may comprises at least one antenna, at least one radio configured to perform wireless communication using at least one radio access technology and one or more processors coupled to the at least one radio. The at least one radio and the one or more processors are configured to cause the BS to acquire, from a satellite in a Non-Terrestrial Network (NTN), an initial measurement between a user equipment (UE) and the satellite for determination of a location of the UE, acquire a compensation factor for compensating for a movement of the satellite to be used in determining the location of the UE, and provide the initial measurement and the compensation factor to a location server for calculation of the location of the UE.