Satellite-to-ground communication data transmission method and system

By segmenting data into physical frames with sequence numbers and selectively retransmitting them in the satellite-to-ground communication system, and dynamically adjusting the transmission window, the problems of low channel utilization and insufficient transmission reliability in satellite-to-ground laser communication are solved, achieving efficient data transmission and link adaptability.

CN121508635BActive Publication Date: 2026-06-09北京融为科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
北京融为科技有限公司
Filing Date
2026-01-14
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing satellite-to-ground laser communication systems suffer from low channel utilization and insufficient throughput when facing dynamically changing atmospheric environments, and the reliability and integrity of transmission are difficult to guarantee. In particular, there are problems of long delays and low retransmission efficiency in communication between low-Earth orbit satellites and ground stations.

Method used

The method involves dividing the data to be transmitted into multiple physical frames with unique, continuously increasing sequence numbers and continuously transmitting them within the transmission window. At the same time, the receiving end performs frame verification and status bitmap updates, generates uplink feedback frames to identify frames that need to be retransmitted and performs selective retransmission, dynamically adjusts the transmission window size, and optimizes transmission based on link quality indicators.

Benefits of technology

It improved channel utilization and system throughput, enhanced adaptability to dynamically changing link environments, ensured the integrity and reliability of critical data transmission, and improved system stability and resource utilization efficiency.

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Abstract

The application provides a satellite-ground communication data transmission method and system, comprising: a sending end divides to-be-transmitted data into multiple data segments and encapsulates the data segments into multiple physical frames with unique and continuously increasing sequence numbers, and continuously sends the multiple physical frames in a sending window; a receiving end checks the received physical frames, and updates a receiving state bitmap based on a checking result; the receiving end generates an uplink feedback frame including a starting sequence number and the receiving state bitmap when a feedback condition is reached; the sending end receives the uplink feedback frame, identifies physical frames that need to be retransmitted according to the starting sequence number and the receiving state bitmap, adds the physical frames that need to be retransmitted into a retransmission scheduling queue and performs selective retransmission, and statistically obtains a link quality index according to the uplink feedback frame, and dynamically adjusts the size of the sending window based on the link quality index. In this way, continuous transmission and efficient feedback of multiple frames in a satellite-ground communication link can be realized, the channel utilization and system throughput are improved, and the adaptability to a dynamically changing link environment is enhanced.
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