Adaptive NTN Search Windows for Positioning Reference Signals
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Solution Overview
Problem
In non-terrestrial networks (NTN), the varying delays between a terminal device and reference/given network devices make it difficult for the terminal device to correctly receive positioning reference signals, as the configured search windows do not account for the dynamic changes in delay, leading to inaccurate location verification.
Innovation Solution
The terminal device calculates or exchanges information with a third network device (e.g., LMF) to determine a precise search window based on timing offsets and delay differences between network devices, ensuring accurate reception of positioning reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses configuration information of a search window to receive positioning reference signals, then the terminal device can attempt to receive signals from neighboring network devices, but the interval between the configured search window and the actual signal reception time becomes large, causing the terminal device to fail to correctly receive the positioning reference signal due to large delay changes in NTN scenarios
Solution Approach 1:
The patent applies dynamics by making the search window configuration adaptive to changing delay conditions in NTN scenarios. The terminal device dynamically adjusts the search window based on measured delay differences between the serving cell and neighboring cells, rather than using fixed pre-configured parameters. This allows the system to track and accommodate the time-varying characteristics of satellite-based networks where delay changes occur as satellites move relative to the terminal device.
2Measurement precision
If the terminal device measures positioning reference signals to verify location, then location verification can be completed, but the large and changing delay difference between the terminal device and reference/given network devices makes it difficult to correctly receive positioning reference signals using fixed search window configuration
Solution Approach 1:
The patent implements feedback by having the terminal device measure the delay difference between the serving cell and neighboring cell positioning reference signals, then use this measured delay difference to adjust the search window configuration for receiving neighboring cell signals. This closed-loop approach ensures that the search window is continuously adapted to the actual propagation conditions, improving measurement precision while keeping the configuration manageable through automated adjustment based on measurements.
Data Source
AI summary
This application provides a communication method and a communication apparatus. The method includes: A terminal device 1 receives information 1, information 2, and information 3. The information 1 includes a timing offset between a network device 1 and a network device 2. The information 2 is used to calculate a difference between a delay 1 and a delay 2. The delay 1 is a delay between the network device 1 and the terminal device 1, and the delay 2 is a delay between the network device 2 and the terminal device 1. The information 3 includes configuration information of a positioning reference signal 1. The terminal device 1 determines a search window 1 based on the information, and receives, in the search window 1, the positioning reference signal 1 from the network device 1.