D2D Satellite Synchronization via Relay Terminal
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Solution Overview
Problem
In the context of Device to Device (D2D) communication, especially with the introduction of satellite systems, existing technologies face challenges in ensuring synchronization between terminals and satellite systems without relying on base stations.
Innovation Solution
A method where network equipment determines if a terminal cannot be synchronized with a satellite system and indicates another terminal to send a satellite-system-based synchronization signal, ensuring synchronization in a D2D manner by determining the first terminal's position and selecting the second terminal based on its position and satellite signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal directly synchronizes with the satellite system in D2D communication, then synchronization reliability is improved, but coverage area is limited when the terminal cannot receive satellite signals directly
Solution Approach 1:
The patent introduces a second terminal as an intermediary to relay satellite system synchronization signals to the first terminal. The network device identifies the first terminal's inability to synchronize directly with the satellite system and selects a second terminal that can receive satellite signals to act as a mediator, thereby extending coverage to areas where direct satellite signal reception is not possible while maintaining synchronization reliability through the relay mechanism
2Measurement precision
If the network device selects a second terminal based on position information, then synchronization accuracy is improved, but device complexity increases due to position determination and terminal selection processes
Solution Approach 1:
The patent applies preliminary action by having terminals pre-report their position information to the network device before synchronization is needed. The network device stores this position information and uses it when selecting a second terminal to relay synchronization signals, thereby improving synchronization accuracy without adding complex real-time position determination processes during the synchronization event
3Productivity
If D2D communication is implemented without base station forwarding, then communication efficiency is improved, but synchronization difficulty increases when satellite system integration is required
Solution Approach 1:
The patent implements self-service by enabling terminals to autonomously determine their synchronization status and report it to the network device. The network device then autonomously selects appropriate second terminals to relay synchronization signals, allowing the system to self-manage the complexity of satellite system synchronization without requiring base station intervention, thereby maintaining D2D communication efficiency while handling synchronization challenges
Data Source
AI summary
Provided are a synchronisation method, a terminal device, a network device and a storage medium, capable of ensuring synchronisation between a terminal and a satellite system via D2D means. In the method, a network device determines that a first terminal cannot synchronise with a satellite system; the network device instructs a second terminal to send a satellite system-based synchronisation signal, used for the first terminal to synchronise with the satellite system via the synchronisation signal. In a possible implementation, the method may include that: the network equipment receives a first message sent by the first terminal, the first message indicating that the first terminal is not able to be synchronized with the satellite system and the first message including information configured to acquire the present position of the first terminal.