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 information of TN cells, sub-zones, and TN cells within sub-zones, enabling accurate determination of neighboring cells and reducing unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cell reselection methods are used in NTN systems with moving cells, then terminal devices can perform basic cell reselection, but cell reselection accuracy deteriorates and power consumption increases due to unnecessary measurements
Solution Approach 1:
The network device performs preliminary actions by calculating and providing assistant information about TN cell distributions and sub-zone divisions before the terminal device needs to perform cell reselection. This allows the terminal device to pre-know which cells to measure and which to ignore, avoiding unnecessary measurements and reducing power consumption while maintaining accurate cell reselection
Solution Approach 2:
The NTN cell coverage area is segmented into multiple sub-zones based on coverage angles, and TN cells are categorized by their distribution in different sub-zones. This segmentation allows the terminal device to focus measurements only on relevant sub-zones and cell types, significantly reducing the number of unnecessary measurements and associated power consumption
2Measurement precision
If conventional cell reselection methods are used in NTN systems with moving cells, then terminal devices can operate without additional information, but cell reselection accuracy deteriorates
Solution Approach 1:
The network device acts as an intermediary by calculating and providing assistant information about TN cell distributions and sub-zone divisions. This intermediary provides the terminal device with pre-processed information that simplifies the terminal's decision-making process, improving cell reselection accuracy without significantly increasing terminal device complexity
Solution Approach 2:
The assistant information provides locally optimized guidance for different sub-zones within the NTN cell coverage area. Each sub-zone has specific TN cell distribution characteristics, and the terminal device receives tailored information for its current location, enabling accurate cell reselection decisions without requiring complex global analysis
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.