Wireless Device Relay Coverage Detection
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Solution Overview
Problem
Wireless devices using half-duplex FDMA communication struggle to determine if they are within the coverage area of a relay station when moving out of the communication area, leading to disrupted phone calls due to continuous transmission without signal reception from the relay station.
Innovation Solution
Incorporating a positional information acquisition unit and communication area information to determine whether to perform continuous transmission or alternate transmission and reception based on the device's position relative to the relay station's coverage area, allowing for intermittent transmission to receive signals even during speech transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous transmission is performed during speech communication, then speech transmission is maintained, but the device cannot receive signals from the relay station to determine coverage area status
Solution Approach 1:
The wireless device performs periodic switching between transmission mode and reception mode during speech communication. The control unit alternates the operation between the transmission unit and reception unit at predetermined intervals, allowing the device to periodically receive signals from the relay station while maintaining speech transmission capability. This periodic action enables the device to determine coverage area status without completely interrupting speech communication.
2Loss of information
If the device switches between transmission and reception modes, then signal reception is enabled, but speech transmission continuity is interrupted
Solution Approach 1:
The control unit dynamically adjusts the switching between transmission and reception modes based on the determined coverage area status. When the device is determined to be within the coverage area, it maintains continuous transmission mode for uninterrupted speech communication. When outside the coverage area, it switches to intermittent mode with periodic reception opportunities. This dynamic adjustment optimizes both speech transmission continuity and signal reception capability according to real-time conditions.
3Reliability
If the device determines coverage area status through signal reception, then communication reliability is improved, but transmission time is lost during reception periods
Solution Approach 1:
The control unit implements partial switching between transmission and reception modes based on the determined coverage area status. When within the coverage area, it performs only partial switching with brief reception intervals sufficient for coverage determination but minimal transmission interruption. When outside the coverage area, it increases the reception frequency to ensure accurate status determination. This partial or excessive action approach minimizes transmission time loss while ensuring reliable coverage area determination.
Data Source
AI summary
A transmission unit transmits a signal to a relay station. A reception unit receives a signal from the relay station if the transmission unit does not transmit a signal. A control unit determines whether to (1) perform continuous transmission by the transmission unit or (2) perform communication in which transmission by the transmission unit and reception by the reception unit are alternately switched, based on the positional information acquired in the positional information acquisition unit and the communication area information acquired in the communication area information acquisition unit.