HF Testing Equipment Emulating D2D Interference
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Solution Overview
Problem
Current testing equipment for mobile communications terminals struggles to reproduce real-world conditions for D2D communication testing, particularly in scenarios where multiple terminals interfere with each other, leading to unpredictable data signal decoding due to randomly selected frequency resources.
Innovation Solution
HF testing equipment that emulates multiple transmission channels by generating baseband data signals based on predefined channel models, linking them, and converting them into time domain signals to simulate interfering radio transmissions, allowing for reliable testing of D2D communication capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmitting mobile communications terminals select transmission resources at random in the time and frequency domains, then the adaptability of D2D communication is improved, but interferences occur when multiple terminals transmit on the same transmission frequency and time slot
Solution Approach 1:
The testing equipment generates and transmits reference signals from multiple emulated transmitting terminals before actual data transmission. This preliminary action allows the receiving terminal to be pre-configured with expected signal characteristics, enabling it to later identify and separate interfering signals through correlation-based detection methods.
Solution Approach 2:
The patent introduces a specialized testing equipment as an intermediary between transmitting and receiving terminals. This intermediary generates controlled interference scenarios and provides reference signals that act as mediators, allowing the receiving terminal to distinguish between desired signals and interfering signals through correlation processing.
2Reliability
If testing is performed in the actual mobile communications network, then real-world conditions are captured, but the conditions are not reproducible since cell power, timing, and capacity utilisation change constantly
Solution Approach 1:
The testing equipment creates a simplified copy of the D2D communication environment by emulating multiple transmitting terminals and generating their reference signals locally. This copying approach reproduces the essential interference scenarios without requiring actual network deployment, ensuring consistent and reproducible test conditions while maintaining reliability.
Solution Approach 2:
The patent extracts the essential D2D interference scenario from the complex actual network environment. By isolating and reproducing only the critical elements (multiple transmitting terminals, random resource selection, reference signal transmission), the testing equipment achieves reproducible conditions that capture the core reliability issues without the variability of full network operations.
3Reliability
If the receiving mobile communications terminal has to operate correctly under interference scenarios, then the robustness of D2D communication is improved, but the testing complexity increases
Solution Approach 1:
The testing equipment segments the testing function by separating reference signal generation from data transmission. Multiple emulated transmitting terminals each generate their reference signals independently according to their assigned virtual cell IDs and resource configurations. This segmentation allows systematic control of interference scenarios while maintaining manageable equipment complexity.
Solution Approach 2:
The testing equipment is designed with multi-functionality to handle various D2D scenarios. It can emulate multiple transmitting terminals with different virtual cell IDs, configure different resource allocations, and generate appropriate reference signals for each scenario. This universal design allows the same equipment to test robustness under diverse interference conditions without requiring separate specialized devices for each scenario.
Data Source
AI summary
HF testing equipment for testing mobile communications terminals emulates the D2D communications capabilities of at least two mobile communications terminals. Using this equipment, interfering radio transmissions that may occur as a result of randomly selected frequency resources are replicated to test the effect thereof in a mobile communications terminal. A channel model of a transmission channel is emulated, and distortion is impressed on the data signal to be transmitted by means of the model. One baseband data signal in the frequency domain is thus obtained for each transmission channel, and this data signal contains the effects of a particular transmission channel on an undistorted data signal. The various baseband data signals are linked together, e.g., by complex multiplication, and transformed into the time domain. A receipt signal for a mobile communications terminal to be tested, produced by taking account of transmission channels and the accompanying channel distortion, is thus emulated.