Measuring Device for Mobile Radio Relay Station Signal Testing
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Solution Overview
Problem
Current technologies lack effective measuring devices and methods to test mobile-radio relay stations under normal operating conditions, particularly in cellular mobile-radio networks like GSM, UMTS, 3G, and LTE, where the range and reception depend heavily on the location and surrounding buildings, and existing solutions do not allow for accurate measurement of relay station functionality.
Innovation Solution
A measuring device equipped with an antenna and a processing unit that receives and compares signals transmitted by a base station and a relay station, implementing correlation and synchronization to assess the relay station's function, including determining time offsets and comparing received data with payload data to ensure accurate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay stations are used to increase the range and improve reception conditions, then the coverage area and signal quality are improved, but there is no existing measuring device to test the relay station functionality under normal operating conditions
Solution Approach 1:
The measuring device acts as an intermediary by receiving both the first signal from the base station and the second signal from the relay station simultaneously through its antenna. The processing unit then compares these signals to evaluate relay station functionality, serving as a mediator between the communication system components for testing purposes.
Solution Approach 2:
The measuring device creates a copy of the transmission path by receiving both the original signal from the base station and the relayed signal from the relay station. By comparing these signal copies, the device can assess relay station performance without disrupting normal operations.
2Measurement precision
If signal comparison is performed to measure relay station function, then measurement accuracy is improved, but signal synchronization and correlation processing increase device complexity
Solution Approach 1:
The processing unit performs preliminary synchronization of the first and second signals using synchronization symbols before conducting correlation or comparison operations. This preliminary alignment simplifies subsequent processing by ensuring signals are temporally matched, reducing the complexity of the overall measurement process.
Solution Approach 2:
The measuring device uses feedback from signal correlation results to adjust synchronization parameters. By continuously monitoring the correlation between received signals and adjusting timing offsets accordingly, the system achieves accurate measurement while maintaining manageable processing complexity through iterative refinement.
Data Source
AI summary
A measuring device for testing mobile-radio relay stations provides at least one antenna and a processing unit. A base station or a mobile station transmits a first signal to a relay station. The relay station generates a second signal derived from the first signal and transmits it. The antenna of the measuring device receives the first signal and the second signal. The processing unit of the measuring device compares the received signals.