Uplink Channel Quality Simulation for Device Testing
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Solution Overview
Problem
Current methods for testing device reactions to varying uplink channel quality are limited by the need for expensive hardware, particularly as existing baseband-simulators can only simulate downlink channel conditions, not uplink, which is essential for comprehensive network testing.
Innovation Solution
A measuring device and method that generate and transmit signals to simulate uplink channel quality parameters independently of actual channel conditions, allowing devices under test to react without actual fading, using signal generation, transmission, and receiving means to determine reactions such as modulation scheme changes, coding, packet length, and data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radio frequency fader is used to simulate uplink channel conditions, then the measurement accuracy and realism are improved, but the cost and device complexity increase significantly
Solution Approach 1:
The patent creates a virtual copy of the uplink channel conditions by having the device under test generate channel quality indicators that reflect simulated fading conditions. Instead of physically degrading the signal path, the system copies the essential characteristics of poor channel quality through digital indicators, allowing accurate measurement without expensive RF fading equipment.
Solution Approach 2:
The patent replaces the mechanical/electrical RF fader system with a digital/baseband processing system. By substituting physical signal degradation with digital channel quality indicator manipulation, the system achieves the same measurement objectives without the complexity and cost of analog fading equipment.
2Device complexity
If a baseband-simulator is used to reduce cost, then the device complexity and cost are reduced, but the ability to simulate uplink channel conditions is lost
Solution Approach 1:
Instead of trying to simulate uplink fading by degrading the signal path (conventional approach), the patent inverts the approach by having the device under test itself generate channel quality indicators that reflect the desired fading conditions. This allows a simple baseband system to achieve uplink simulation capability that would normally require complex RF equipment.
Solution Approach 2:
The device under test performs the channel quality assessment itself by generating the channel quality indicators based on simulated conditions. This self-service approach eliminates the need for external fading equipment, as the device under test autonomously creates the channel quality feedback that reflects the desired test conditions.
3Reliability
If actual channel fading is applied to the uplink, then the realism of the test is improved, but the measurement of device reaction becomes confounded by receiver performance variations
Solution Approach 1:
The patent introduces channel quality indicators as an intermediary between the actual channel and the device under test. These indicators mediate the channel information, allowing the device under test to react to simulated channel conditions without the actual signal path being degraded. This separates the channel simulation function from the physical transmission path, eliminating receiver performance confounding.
Data Source
AI summary
A measuring device for measuring a reaction of a device under test to an uplink channel quality parameter, indicating a quality of a transmission channel from the device under test to the measuring device, comprises signal generation means, set up for generating a first signal including the uplink channel quality parameter. The uplink channel quality parameter is set by the signal generation means independent from an actual channel quality of the transmission channel. Transmission means is set up for transmitting a second signal, which is derived from the first signal or is identical to the first signal to the device under test. Receiving means is set up for receiving a third signal transmitted by the device under test and created by the device under test based upon the uplink channel quality parameter and for determining the reaction of the device under test to the uplink channel quality parameter.