Feeder Link Switch Transmission Control in NTN
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Solution Overview
Problem
During feeder link switch in non-terrestrial network (NTN) technology, there is a challenge in managing uplink (UL) and downlink (DL) transmissions between terminal devices and network devices, as existing methods do not effectively suspend or resume transmissions to prevent unnecessary operations during the switch, leading to system overhead.
Innovation Solution
A method is introduced where indication information is received or transmitted to suspend UL and/or DL transmissions during feeder link switch between NTN gateways connected to the same cell, using timers to control transmission pauses and resumptions, ensuring efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UL and DL transmissions continue during feeder link switch, then transmission continuity is maintained, but system overhead increases due to unnecessary operations
Solution Approach 1:
The network device sends indication information to the terminal device in advance before the feeder link switch occurs, notifying the terminal to suspend UL transmission. This preliminary action allows the terminal to stop unnecessary transmissions before the switch, reducing system overhead while maintaining transmission continuity after the switch by resuming UL transmission based on the same indication information or new scheduling.
2Loss of energy
If UL transmission is suspended during feeder link switch, then system overhead is reduced, but transmission delay increases
Solution Approach 1:
The network device sends indication information to the terminal device to control UL transmission suspension and resumption. This feedback mechanism allows the network to dynamically adjust terminal behavior based on feeder link switch status, reducing system overhead during switch while minimizing transmission delay through timely resumption instructions.
3Productivity
If indication information is sent to control transmission suspension, then transmission efficiency is improved, but signaling overhead increases
Solution Approach 1:
The indication information serves multiple functions: it notifies the terminal of feeder link switch, instructs UL transmission suspension, and can trigger DL transmission suspension or resumption. This multi-functionality reduces the need for separate signaling messages, thereby improving transmission efficiency while minimizing signaling overhead.
Data Source
AI summary
In the method for transmission control, a terminal device receives indication information from a network device, where the indication information indicates that a satellite in communication with the terminal device performs feeder link switch between a first non-terrestrial network (NTN) gateway and a second NTN gateway, and the first NTN gateway and the second NTN gateway are connected to a same cell corresponding to the network device. The terminal device suspends UL transmission and/or DL transmission with the network device according to the indication information during the feeder link switch.