Inter-Satellite Data Forwarding for Low-Latency NTN Paging
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Solution Overview
Problem
Non-terrestrial network (NTN) communication systems experience high service latency due to the store-and-forward operation mode, where the service link and feeder link are not simultaneously available, leading to delayed data transmission to terminals.
Innovation Solution
Implementing a data transmission method that forwards data between satellites via inter-satellite links, allowing timely delivery of data to terminals by using anchor-like and relay satellites to manage data routing and paging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If store-and-forward operation mode is used in NTN, then satellite can serve users without continuous feeder link availability, but service latency increases significantly
Solution Approach 1:
The patent applies preliminary action by having the first satellite forward data to the second satellite in advance before the terminal actually needs it. The second satellite stores this data temporarily and pages the terminal when it enters the coverage area, eliminating the need to wait for feeder link availability and significantly reducing service latency while maintaining store-and-forward operation mode benefits
2Ease of operation
If data is stored at satellite until feeder link is available, then network operation flexibility is maintained, but data transmission delay increases
Solution Approach 1:
The invention performs preliminary action by forwarding data ahead of time to the serving satellite before the terminal becomes available or before feeder link constraints arise. This allows the satellite to have data ready for immediate transmission via service link, maintaining operational flexibility while eliminating transmission delays
Solution Approach 2:
The first satellite acts as an intermediary by receiving data from the second satellite and forwarding it to terminals in its coverage area. This intermediary mechanism enables direct service link transmission without waiting for feeder link availability, reducing delay while maintaining the store-and-forward architecture
Data Source
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AI summary
This disclosure relates to a data transmission method and a satellite. The method includes the following. A first satellite receives data for a first terminal from a second satellite. The first satellite sends the data for the first terminal to the first terminal paged. In embodiments of the disclosure, the data for the first terminal is forwarded between satellites, so that the data can be timely forwarded to the first terminal paged, thereby reducing service latency.