NTN Cell Reselection Using Sub-Zone Assistant Information
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Solution Overview
Problem
In non-terrestrial network (NTN) systems with moving cells, conventional cell reselection methods are inadequate for terminal devices, leading to inaccurate cell reselection and increased power consumption due to unnecessary measurements.
Innovation Solution
The method involves providing first assistant information to terminal devices for cell reselection in NTN cells, which includes distribution of TN cells, sub-zones, and TN cells within sub-zones, reducing unnecessary measurements and power consumption by guiding accurate cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cell reselection methods are used in NTN cells with moving coverage, then terminal devices can perform basic cell reselection, but cell reselection accuracy deteriorates and unnecessary measurements increase power consumption
Solution Approach 1:
The network device pre-calculates and provides assistant information including coverage area, moving trajectory, and velocity parameters to the terminal device before cell reselection is needed. This allows the terminal device to predict future coverage areas and identify potential target cells in advance, avoiding unnecessary real-time measurements and reducing power consumption while maintaining accurate cell reselection.
2Measurement precision
If assistant information about TN cell distribution and sub-zones is provided to terminal devices, then cell reselection accuracy is improved, but information processing complexity increases
Solution Approach 1:
The NTN cell coverage area is divided into multiple sub-zones based on the moving trajectory and velocity parameters. Each sub-zone contains specific TN cells that are likely to become target cells when the terminal device moves to that region. This segmentation allows the terminal device to focus processing on relevant sub-zones and TN cells rather than all possible cells, reducing information processing complexity while maintaining high cell reselection accuracy.
Data Source
AI summary
The present application provides a method and an apparatus for wireless communication. An example method includes: performing, by a terminal device, cell reselection in a non-terrestrial network (NTN) cell based on first assistant information, wherein the first assistant information is associated with one or more of the following information: distribution of terrestrial network (TN) cells in the NTN cell; a sub-zone in the NTN cell, wherein the sub-zone is related to a coverage angle of a network device corresponding to the NTN cell; or a TN cell comprised in the sub-zone in the NTN cell.