Frequency Selective Channel Modeling for e-Node B Testing
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Solution Overview
Problem
Current methods for testing radio network equipment, such as e-Node Bs, fail to effectively simulate frequency-specific channel conditions, which are crucial for evaluating the equipment's response to varying channel qualities across multiple UEs, especially when hundreds or thousands of UEs are involved, as they do not account for frequency allocation in bandwidth.
Innovation Solution
A network equipment test device with a UE emulator and a frequency selective channel modeler that determines channel performance categories across the bandwidth by receiving resource scheduling information, allowing emulated UEs to communicate channel quality parameters based on resource block performance categories, thereby simulating frequency-specific channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel quality parameters are simulated on a per UE basis by changing CQI, BLER, or other parameters, then the e-Node B's response to varying channel conditions can be tested, but the method does not account for frequency allocation in bandwidth and becomes cumbersome when hundreds or thousands of UEs are simulated
Solution Approach 1:
The patent divides the bandwidth into multiple frequency segments or resource blocks, each with its own channel quality characteristics. Instead of modeling each UE individually across the entire bandwidth, the system segments the frequency spectrum and assigns channel quality parameters to specific frequency segments, reducing the overall complexity while maintaining testing accuracy.
Solution Approach 2:
The patent implements frequency-selective channel modeling where different channel quality parameters (CQI, BLER) are assigned to different frequency segments or resource blocks. This allows local customization of channel conditions for specific frequency allocations rather than applying uniform channel quality across all UEs and frequencies, enabling realistic simulation of frequency-specific channel conditions.
2Ease of operation
If uniform channel quality parameters are applied across all UEs, then the modeling process is simplified, but the frequency-specific channel conditions that affect e-Node B scheduling decisions cannot be accurately simulated
Solution Approach 1:
The patent applies local quality by assigning different channel quality parameters to different frequency segments or resource blocks. Each frequency segment can have its own CQI, BLER, and other channel characteristics, allowing accurate simulation of frequency-specific conditions while maintaining a structured approach that is easier to manage than fully individualized per-UE modeling.
Solution Approach 2:
The patent creates a universal channel modeling framework that can be applied across multiple UEs simultaneously. The frequency-selective channel model serves multiple UEs that are allocated to the same frequency segments, providing a multi-functional solution that scales efficiently from few to many UEs while maintaining accuracy.
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AI summary
The subject matter described herein includes methods, systems, and computer readable media for frequency selective channel modeling. One exemplary system includes a network equipment test device including at least one processor. The network equipment test device includes the UE emulator implemented by the at least one processor and configured to emulate a plurality of UEs that attach to and communicate with a device under test. The system further includes a frequency selective channel modeler configured to receive resource scheduling information for the UEs from the device under test, to determine channel performance categories for the UEs using the resource scheduling information and to determine values for channel quality parameters using the channel performance categories assigned to the resource blocks, which represent selected frequencies in the total channel bandwidth. The emulated UEs communicate the channel quality parameters to the device under test based on the frequency allocated for a given UE in the channel bandwidth.