5G UE Positioning Using RTT and Cross-Link Interference
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Solution Overview
Problem
Existing positioning methods in 5G wireless networks face challenges in accurately determining the location of mobile devices due to interference and lack of efficient techniques for utilizing cellular reference signals for precise location estimation.
Innovation Solution
The method involves instructing a target UE and another UE to report time differences of cellular reference signal transmissions and receptions, utilizing cross-link interference resources to calculate distances and determine the location of the target UE, using signals like DL-RS or SL-RS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing positioning methods use traditional reference signal measurements, then positioning functionality is provided, but measurement accuracy is reduced due to interference and inefficient utilization of cellular reference signals
Solution Approach 1:
The patent converts cross-link interference, traditionally a harmful factor, into a beneficial measurement resource. By instructing UEs to report time differences of cellular reference signal transmissions and receptions through cross-link interference resources, the system transforms interference into useful positioning data for calculating distances and determining target UE location with enhanced accuracy
Solution Approach 2:
The patent changes the measurement parameters by utilizing time difference measurements of reference signal transmissions and receptions. Instead of traditional signal strength measurements, the system measures time differences (T1, T2, T3) between signal transmission and reception events, providing more precise location determination through temporal parameter analysis
2Measurement precision
If traditional positioning methods are used in 5G networks, then basic location determination is achieved, but positioning precision is insufficient for high-accuracy applications
Solution Approach 1:
The patent segments the positioning measurement process into distinct time difference measurements (T1, T2, T3) that can be independently calculated and reported. Each UE measures specific time differences between reference signal events, and these segmented measurements are combined to derive the target UE's location, enabling high precision through modular measurement approach
Solution Approach 2:
The patent introduces time difference measurements as intermediary parameters between raw reference signal measurements and final location determination. The measured time differences (T1, T2, T3) serve as intermediate variables that bridge the gap between signal reception data and calculated distances, ultimately leading to precise position estimation
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
This approach enhances the accuracy of location determination by leveraging cross-link interference measurements, providing precise distance calculations and location estimation in 5G networks.
Implementation Method 1
a first time difference, the first time difference being a first time amount between receipt of the first cellular reference signal by the target UE and transmission of a second cellular reference signal by the target UE
Data Source
AI summary
An apparatus comprises: an interface; a memory; and a processor, communicatively coupled to the interface and the memory, configured to: instruct a node to send a first cellular reference signal to a target UE (user equipment) and to another UE, the node being a cellular-communication node; instruct, via the interface, the target UE to report to the node a first time difference, the first time difference being a first time amount between receipt of the first cellular reference signal by the target UE and transmission of a second cellular reference signal by the target UE; and instruct, via the interface, the other UE to report a second time difference, the second time difference being a second time amount between receipt of the first cellular reference signal by the other UE and receipt of the second cellular reference signal, in a cross-link interference resource, by the other UE.