Wireless Terminal Frequency Switching for Stable Communication
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining communication quality when wireless terminal devices with different transmission power levels communicate, especially in areas with unstable radio signal environments, and require frequent frequency changes when switching between trunking and talk-around methods, leading to communication disruptions.
Innovation Solution
A wireless terminal device that requests communication permission using the same frequency as the downlink signal from a pre-registered relay device, allowing direct communication without changing both receiving and transmitting frequencies, even in unstable environments, by utilizing the same frequency for communication when permission is not granted from the initial relay device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wireless terminal device switches between trunking method and talk-around method by detecting downlink signal from repeater, then communication can be maintained in different coverage areas, but communication quality deteriorates in fringe areas where devices with different transmission power levels communicate
Solution Approach 1:
The patent applies local quality by having each wireless terminal device independently determine its communication method based on its own reception capability. The first wireless terminal device (with higher transmission power) can operate in talk-around mode while the second device (with lower transmission power) operates in trunking mode, allowing each device to use the communication method最适合 its local conditions rather than forcing uniform operation mode across all devices
Solution Approach 2:
The patent segments the communication system into two independent communication paths: trunking mode communication through repeater and talk-around mode direct communication. This segmentation allows the system to divide devices into different communication groups based on their reception capabilities, with the first device using talk-around and the second device using trunking, thereby resolving the communication quality issue in fringe areas
2Adaptability or versatility
If both receiving frequency and transmitting frequency are changed when switching communication methods, then frequency allocation can be optimized, but switching time increases and communication disruptions occur
Solution Approach 1:
The patent applies preliminary action by having wireless terminal devices pre-acquire and store downlink frequency information from repeaters before actual communication needs arise. When switching from trunking mode to talk-around mode, devices can immediately use the pre-stored downlink frequency as their transmission frequency without requiring frequency searching or adjustment, thus eliminating switching time and preventing communication disruptions
Solution Approach 2:
The patent uses the repeater's downlink signal as an intermediary to establish the talk-around communication frequency. Instead of requiring devices to directly negotiate or search for frequencies, the system uses the repeater's downlink frequency as a reference that both devices can utilize, simplifying the frequency switching process and reducing transition time
Data Source
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AI summary
A wireless terminal device (TA) receives a downlink signal that is repeatedly transmitted from a pre registered home repeater when requesting communication, specifies an idle channel based on idle channel information that is included in the downlink signal, and using the frequency of the uplink signal of the idle channel requests communication permission from the relay device that provides the idle channel. When communication permission cannot be received from the relay device from which communication permission was previously requested, the wireless terminal device (TA) uses the same frequency as the frequency of the downlink signal from the home repeater to transmit a signal to the wireless terminal device (TB) of an intended other party requesting communication.