NTN Terminal Synchronization Using Time-Period Reference Information
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Solution Overview
Problem
The long communication distance between terminal devices and satellites in Non-Terrestrial Networks (NTNs) results in high propagation delays, posing challenges for time and frequency domain synchronization, leading to increased power consumption due to frequent system message reading for synchronization updates.
Innovation Solution
A network device notifies a terminal device with first information associated with a first time period, enabling the terminal device to achieve time and/or frequency domain synchronization within that period, reducing the need for frequent message reading and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device frequently reads system messages to update synchronization, then time and frequency domain synchronization accuracy is improved, but power consumption increases
Solution Approach 1:
The network device performs preliminary synchronization configuration by providing the terminal device with synchronization reference information (such as satellite ephemeris data, timing advance values, and frequency offset corrections) in advance through system messages. This allows the terminal device to maintain synchronization without needing to frequently read update messages, as the preliminary information covers a valid time period during which synchronization parameters remain accurate.
Solution Approach 2:
Instead of continuous or frequent message reading, the system implements periodic synchronization updates where the network device transmits synchronization information at predetermined intervals. The terminal device reads system messages only at these periodic intervals rather than continuously, maintaining synchronization accuracy while significantly reducing power consumption associated with frequent message access.
2Use of energy by moving object
If the terminal device reads system messages less frequently, then power consumption is reduced, but synchronization accuracy deteriorates
Solution Approach 1:
The network device provides comprehensive synchronization reference information in advance that remains valid for an extended time period. This preliminary action ensures that even when the terminal device reads messages less frequently, the synchronization accuracy is maintained because the pre-provided information (including satellite orbital parameters and timing corrections) remains accurate throughout the extended validity period.
Solution Approach 2:
The system changes the parameter of message reading frequency from high to low, while compensating for potential synchronization degradation by enhancing the information content provided in each message. The network device includes extended validity period indicators and updated synchronization parameters that allow the terminal device to operate with reduced message reading frequency while maintaining adequate synchronization accuracy.
Data Source
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AI summary
The embodiments of the present disclosure provide a wireless communication method, a terminal device, and a network device. The network device can notify the terminal device of first information corresponding to a first time period in a message, such that the terminal device can obtain time domain and/or frequency domain synchronization within the corresponding first time period according to the first information. The wireless communication method includes: receiving, by a terminal device, first information transmitted by a network device. The first information is associated with a first time period, and the first information is used to obtain at least one of: a first timing value, an offset rate of a first timing value, a rate of change of an offset rate of a first timing value, a first frequency offset value, an offset rate of a first frequency offset value, a rate of change of an offset rate of a first frequency offset value, first ephemeris information, the first time period, or one or more time domain positions corresponding to the first time period.