Radio Channel Data Emulation via Directional Delay Profile Taps
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Solution Overview
Problem
Current radio channel emulators in OTA testing do not accurately replicate real radio channels, leading to a need for more realistic radio channel data for both terminal vendors and network operators to effectively measure and debug mobile terminals and network issues.
Innovation Solution
An apparatus and method that receive wireless transmission data from a radio system, form taps of a delay profile, estimate directional information, and map radio channel data onto multiple input multiple output (MIMO) emulated antennas in an over-the-air chamber, allowing for a more accurate emulation of real radio channels by associating taps with estimated directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radio channel emulation methods are used in OTA chambers, then the testing setup is simple, but the accuracy of radio channel replication is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-collecting radio channel data from real environments and pre-processing it into delay profile taps with directional information before the actual OTA testing. This pre-prepared channel data is then reused across multiple test scenarios, eliminating the need for complex real-time channel synthesis while maintaining high emulation accuracy.
Solution Approach 2:
The patent uses copying by creating a digital replica of real radio channels through measured delay profiles and directional information. Instead of physically recreating complex propagation environments, the system copies essential channel characteristics (delay, direction, power) into a data structure that can be efficiently applied during testing, achieving realistic emulation without proportional complexity.
2Reliability
If directional delay profile data is collected and processed to improve channel emulation realism, then the radio channel data accuracy improves, but the data processing complexity increases
Solution Approach 1:
The patent applies segmentation by breaking down the radio channel into discrete delay profile taps, each characterized by specific parameters (delay, direction, power). This segmentation transforms the continuous complex channel into manageable discrete elements that can be independently processed and efficiently stored, improving reliability while controlling processing complexity through structured data organization.
3Measurement precision
If real radio channel data is collected from live networks, then the realism of emulation environments improves, but the time and resources required for data collection increase
Solution Approach 1:
The patent applies preliminary action by conducting comprehensive radio channel measurements in advance during system setup or calibration phases. The collected directional delay profile data is stored and reused for subsequent testing activities, eliminating the need for repeated time-consuming field measurements while maintaining high realism in emulation environments across multiple test campaigns.
Data Source
AI summary
An apparatus comprises a receiver receiving wireless transmission of a real radio system from at least one base station of a radio system as a function of reception direction. The transmission comprises predetermined data. The apparatus comprises also a processing unit that forms taps of a delay profile on the basis of comparison between the data that is received and corresponding predetermined data. The processing unit estimates direction for the taps of the delay profile on the basis of a reception direction of the transmission, and forms radio channel data by associating the taps of the delay profile with the estimated direction. The radio channel data is for a radio channel model of a MIMO emulation in an OTA chamber having a plurality of antennas around a test zone where a device-under-test may be placed.