Relay Device Synchronization via Control Channel in Wireless Systems
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Solution Overview
Problem
In trunking wireless communication systems, changing communication channels can lead to synchronization issues between wireless terminal devices and repeaters, resulting in delayed frame synchronization and potential data loss, particularly due to the need for expensive and complex receiving and control circuits, as well as the requirement for separate synchronization signal lines, which increase costs.
Innovation Solution
A wireless communication system where relay devices are connected via a communication line with unique channels, allowing wireless terminal devices to select channels based on control information and maintain synchronization by exchanging information through the communication line, eliminating the need for exclusive synchronization signal lines and costly circuits, and ensuring synchronization is maintained during channel changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate synchronization signal lines are used to establish synchronization between repeaters and wireless terminal devices, then synchronization reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the synchronization signal transmission function with the existing control channel signal transmission function. The master repeater transmits synchronization signals through the same transmission path used for control channel signals, eliminating the need for separate synchronization signal lines. This merging approach maintains synchronization reliability while significantly reducing device complexity and cost.
Solution Approach 2:
The control channel signal transmission path is given multiple functions: it serves both as the control channel for communication channel connection and as the synchronization signal transmission path. This multi-functionality allows the system to maintain synchronization without additional dedicated hardware, resolving the contradiction between reliability and complexity.
2Speed
If fast receiving circuits and control circuits are provided to quickly establish synchronization during channel changes, then synchronization speed is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements preliminary action by having the master repeater continuously transmit synchronization signals through the control channel before any channel change occurs. This continuous transmission ensures that wireless terminal devices are already synchronized with the control channel timing, so when channel changes happen, the synchronization is already in place or can be quickly re-established using the existing control channel path without requiring complex fast-acquisition circuits.
3Adaptability or versatility
If control information is transmitted through the control channel to manage communication channels, then system control capability is improved, but synchronization stability deteriorates during channel changes
Solution Approach 1:
The patent uses feedback mechanisms where the master repeater continuously transmits synchronization signals through the control channel, and wireless terminal devices monitor this control channel for synchronization information. When channel changes occur, the feedback loop allows devices to detect the change and re-synchronize using the control channel's synchronization signals, maintaining stability despite channel switching adaptability.
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AI summary
A wireless communication system comprises a relay system including a plurality of relay devices and a plurality of wireless terminal devices. Each relay device transmits control information to the wireless terminal device which is registered in the own relay device, and each wireless terminal device selects, based on the control information received from the relay device which registers the own wireless terminal device, a channel which is currently able to relay a communication among channels respectively allocated to the relay devices to establish a communication between the wireless terminal devices. Each relay device acquires information configuring the control information via a communication line and causes a downlink signal wirelessly transmitted by the own relay device to synchronize with a communication signal, and each wireless terminal device maintains, when shifting a channel for communication to another channel, a synchronized state established in a channel prior to shifting.