IoT Terminal Timing Adjustment for Satellite Sync Gaps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In satellite communication systems, timing adjustments are challenging due to high-speed satellite movement, making it difficult to complete synchronization during uplink and downlink gaps.
Innovation Solution
A timing adjustment method and device that allows terminals to report target information for new timing adjustments and perform adjustments based on received or original information, and a base station to determine and send new timing adjustment information as needed to ensure synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is introduced between consecutive uplink retransmissions for downlink time-frequency synchronization, then synchronization performance is maintained, but timing adjustment cannot be completed due to limited gap duration and high-speed satellite movement
Solution Approach 1:
The terminal performs timing adjustment in advance during the uplink transmission gap before the next uplink retransmission. By preparing and executing the timing adjustment beforehand, the system ensures synchronization is maintained without requiring the adjustment to be completed during the limited gap duration, thus resolving the contradiction between maintaining synchronization and completing timing adjustment.
2Reliability
If repeated transmission is used to meet coverage requirements in IoT services, then data reliability is improved, but timing synchronization becomes difficult to maintain due to long-term consecutive transmission and limited gap duration
Solution Approach 1:
The system maintains continuous timing adjustment capability throughout the repeated transmission process. By enabling the terminal to perform timing adjustment during each uplink transmission gap, the useful action of timing synchronization is maintained continuously across multiple retransmissions, preventing timing drift accumulation while ensuring data transmission reliability.
Data Source
AI summary
A timing adjustment method includes: reporting, by a terminal supporting an internet of things (IoT) service in a satellite communication system, target information, the target information is information related to a timing adjustment requested by the terminal; and performing, by the terminal, in response to not receiving new timing adjustment information, the timing adjustment based on original timing adjustment information; or performing, by the terminal, in response to receiving new timing adjustment information, the timing adjustment based on the new timing adjustment information.