Cell Reselection Parameter Indication for NTN Terminals
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Solution Overview
Problem
In non-terrestrial network (NTN) communication systems, terminals face challenges in timely cell reselection due to the lack of obvious distance effects, leading to delayed and repetitive cell reselections, as existing methods do not provide a clear solution for identifying the best cell reselection method among multiple options.
Innovation Solution
A method for cell reselection in NTN systems, where a terminal receives cell reselection parameter indication information from a network device, allowing it to perform cell reselection based on parameters such as signal quality, time information, and location parameters, enabling determination of the most suitable reselection method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple cell reselection methods are introduced to avoid delayed reselection in NTN, then cell reselection timeliness is improved, but device complexity increases due to the need to identify the best method among multiple options
Solution Approach 1:
The patent applies parameter changes by introducing specific cell reselection parameters (such as distance effect parameters, cell reselection priority parameters, and threshold parameters) that can be configured by the network device. These parameters enable the terminal to adaptively adjust its reselection behavior based on NTN-specific conditions, resolving the contradiction by providing a standardized parameter-based approach that improves timeliness without increasing complexity through ad-hoc method selection
2Device complexity
If traditional cell reselection criteria S and R are used in NTN, then device complexity is maintained at low levels, but cell reselection accuracy deteriorates due to lack of obvious distance effects
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure and indicate appropriate cell reselection parameters to the terminal before reselection is needed. This includes providing distance effect parameters and other NTN-specific parameters in advance, allowing the terminal to perform accurate reselection without complex real-time analysis, thus maintaining low device complexity while improving accuracy
Solution Approach 2:
The patent introduces cell reselection parameters as intermediaries between the network device and terminal. These parameters (including distance effect parameters, priority parameters, and threshold values) act as mediators that convey network intentions and NTN conditions to the terminal, enabling accurate reselection decisions without requiring the terminal to implement complex judgment logic
Data Source
AI summary
A method for cell reselection is performed by a terminal and includes: receiving cell reselection parameter indication information transmitted by a network device, where the cell reselection parameter indication information indicates one or more cell reselection parameters; and performing the cell reselection based on the one or more cell reselection parameters. A method for cell reselection is performed by a network device and includes: transmitting cell reselection parameter indication information, where the cell reselection parameter indication information indicates one or more cell reselection parameters.