Validation Time Acquisition for Satellite System Information Windows
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Solution Overview
Problem
In satellite communication systems, the longer signal transmission distance leads to larger data transmission delays, and terminals face challenges in accurately determining the validation duration of ephemeris and common timing advance information due to varying system information windows, which can result in incorrect reception of system information.
Innovation Solution
A method and apparatus that allow terminals to flexibly configure the acquisition mode of validation time for ephemeris and common timing advance information through explicit or implicit modes, indicated by network devices, enabling efficient and robust communication by merging or independently receiving system information within specified time domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal uses a fixed validation duration for ephemeris and common TA information, then the terminal can simplify its processing, but the validation time may be incorrect when system information windows vary in length
Solution Approach 1:
The patent applies dynamics by making the validation duration adaptive rather than fixed. The terminal determines the validation duration dynamically based on the actual length of the system information window and the position of the current time within that window. This allows the validation time to adjust automatically to different system information window configurations, resolving the contradiction between simplicity and accuracy.
Solution Approach 2:
The patent changes the parameter of validation duration from a static fixed value to a dynamic value calculated based on system information window characteristics. By computing the validation duration as a function of the system information window length and current time position, the patent achieves both reasonable complexity and high precision in validation time determination.
2Loss of time
If the terminal independently receives system information in each window, then the terminal can ensure data freshness, but the information reception reliability decreases when some windows fail
Solution Approach 1:
The patent applies merging by combining system information from multiple system information windows. When the terminal fails to receive valid system information in one window, it can merge and use the information from other successfully received windows. This ensures both information freshness (by using the most recent valid data) and reliability (by having fallback options from multiple windows).
Data Source
AI summary
A validation time acquisition method is performed by a terminal, and includes: receiving first indication information sent by a network device; wherein the first indication information is configured to indicate an acquisition mode of a validation time of first information, and the acquisition mode comprises at least one of a first mode or a second mode.