Satellite Uplink Ephemeris Refresh After Synchronization Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In satellite communications, ephemeris information failure due to satellite movement leads to uplink out-of-synchronization, disrupting data transmission and affecting communication reliability.
Innovation Solution
A method for acquiring ephemeris information by detecting uplink out-of-synchronization states and initiating processes to re-acquire ephemeris information, including timer-based acquisition and network-side indication, to ensure uplink synchronization and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ephemeris information is acquired periodically through system information, then the UE can obtain satellite location for uplink synchronization, but the ephemeris information may fail due to satellite movement, causing uplink out-of-synchronization and disrupting data transmission
Solution Approach 1:
The base station sends indication information in advance to notify the UE about ephemeris information validity status before the UE actually needs to use it for uplink transmission. This allows the UE to proactively acquire fresh ephemeris information when indicated, preventing synchronization failures rather than reacting after failure occurs.
Solution Approach 2:
The base station provides feedback to the UE about the current validity status of ephemeris information through indication information. This feedback mechanism allows the UE to adjust its ephemeris acquisition behavior dynamically, ensuring it has valid ephemeris data when needed while avoiding unnecessary acquisitions that would waste resources.
2Reliability
If the UE continuously monitors and re-acquires ephemeris information to maintain synchronization, then uplink transmission reliability improves, but the complexity of the UE operation and processing increases
Solution Approach 1:
The UE autonomously determines when to acquire ephemeris information by receiving simple indication information from the base station and independently executing the acquisition process when needed. The indication information triggers the UE's own ephemeris acquisition capability without requiring complex coordinated control, reducing overall system complexity while maintaining reliability.
3Reliability
If the UE acquires ephemeris information on demand when detecting uplink out-of-synchronization, then communication reliability is maintained, but the time required to restore synchronization and resume data transmission increases
Solution Approach 1:
The base station sends indication information in advance to prompt the UE to acquire ephemeris information before the UE actually experiences uplink out-of-synchronization. This preliminary action allows the UE to refresh its ephemeris data proactively, so when uplink transmission needs to resume, the synchronization restoration time is minimized or eliminated.
Data Source
AI summary
Provided are an ephemeris information acquisition method, an indication method, a communication node, and a storage medium. The ephemeris information acquisition method includes: determining that a user equipment (UE) is in an uplink out-of-synchronization state (110); and in a case of uplink out-of-synchronization, acquiring ephemeris information (120).