TAC Acquisition Mode Selection in NTN Terminals
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Solution Overview
Problem
In mobile communication networks, terminals face challenges in determining the appropriate Tracking Area Code (TAC) obtaining mode, leading to unnecessary signaling overhead and energy consumption due to frequent Tracking Area Updates (TAU) in Non-Terrestrial Networks (NTN) caused by satellite movements, where both network-based and terminal-based TAC solutions are not consistently supported.
Innovation Solution
A method and apparatus for determining a TAC obtaining mode that includes determining both network-supported and terminal-supported modes, allowing the terminal to select the appropriate mode based on received indication information, thereby reducing TAU frequency and improving compatibility with communication environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal frequently performs Tracking Area Updates (TAU) to ensure accurate position tracking in NTN environments, then the position management accuracy is improved, but the signaling overhead and energy consumption increase significantly
Solution Approach 1:
The patent changes the TAC acquisition mode from terminal-based determination to network-based indication, allowing the network to control whether TAC is obtained from broadcast or terminal determination, thereby optimizing the balance between position accuracy and energy consumption based on network conditions
2Measurement precision
If the terminal frequently performs Tracking Area Updates (TAU) to ensure accurate position tracking in NTN environments, then the position management accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent introduces a new parameter (first indication information) that enables the network to indicate the TAC acquisition mode, reducing unnecessary TAU signaling by allowing terminals to determine TAC locally when appropriate, thereby reducing signaling overhead while maintaining position management accuracy
3Adaptability or versatility
If the network configures both network-based and terminal-based TAC obtaining modes, then the adaptability to different communication environments is improved, but the device complexity increases
Solution Approach 1:
The patent uses parameter changes (indication information carried in system information or RRC messages) to dynamically control the TAC acquisition mode, allowing the network to simplify terminal operations by indicating the appropriate mode rather than requiring terminals to complexly determine and manage multiple acquisition modes
Solution Approach 2:
When the network indicates terminal-based TAC determination mode, the terminal serves itself by autonomously determining TAC from its own stored information, reducing network signaling and simplifying the overall system operation while maintaining adaptability
Data Source
AI summary
A method and apparatus for improving operation of a wireless communication network. The wireless communication network is improved by determining a TAC obtaining mode includes: determining a first TAC obtaining mode supported by a network-side device; determining a second TAC obtaining mode supported by a terminal; and based on the first TAC obtaining mode and the second TAC obtaining mode, determining a mode of obtaining a target TAC. In the present disclosure, the terminal may, based on the TAC obtaining mode supported by the network-side device and the TAC obtaining mode supported by the terminal, select an appropriate TAC obtaining mode to obtain a TAC.