5G Digital Beamforming Testing via Spatial Stream Association
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Solution Overview
Problem
Current test systems face challenges in emulating beamforming for multi-user, massive MIMO environments in 5G wireless networks, particularly in identifying associations between spatial streams and emulated UEs without physical separation, which is essential for comprehensive testing of 5G infrastructure.
Innovation Solution
A method and system that process spatial streams and beamforming weight sets to enable realistic MU-MIMO emulation by computing phase vectors, generating sounding reference symbols, and using score tables to associate spatial streams with emulated UE positions, allowing for efficient identification and processing of data intended for each UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conducted RF tests are performed with array antennas, then beamforming functionality can be tested, but the complexity and impracticality increase due to the large number of array elements
Solution Approach 1:
The patent creates virtual copies of the RU and UEs through software emulation. The RU emulator generates spatial streams and beamforming weights, while UE emulators receive and process these streams. This virtual copying approach allows comprehensive beamforming testing without requiring physical array antennas, thereby reducing hardware complexity while maintaining test reliability.
Solution Approach 2:
The patent replaces the physical RF transmission mechanism with digital signal processing. Instead of using actual radio waves and antenna elements, the system uses software-based spatial stream generation and processing. This substitution of mechanical/physical systems with digital mechanisms enables beamforming testing without the complexity of physical array antenna interfacing.
2Reliability
If OTA testing with anechoic RF chambers is used, then beamforming can be tested with physical array antennas, but the cost and scale limitations increase
Solution Approach 1:
The patent emulates the RU and UEs as software-based virtual instances that can be deployed on standard computing hardware. This eliminates the need for expensive anechoic RF chambers and physical array antennas, significantly reducing test system cost while maintaining the ability to comprehensively test beamforming functionality across multiple users and scenarios.
Solution Approach 2:
The patent changes the fundamental parameters of the test system from physical RF-based to digital signal-processing-based. By transitioning from hardware-intensive OTA testing to software-based emulation, the system achieves scalability and cost-effectiveness while preserving beamforming test capabilities through virtual spatial stream generation and processing.
3Measurement precision
If physical spatial separation between UEs is used in test systems, then beamforming associations can be identified, but the mobility and realism of multi-user scenarios are limited
Solution Approach 1:
The patent implements dynamic spatial stream association through software-based beamforming weight management. The system can dynamically assign and reassign spatial streams to different UE emulators based on test scenarios, enabling flexible multi-user testing without requiring physical reconfiguration. This dynamic approach maintains precise spatial stream identification while providing full mobility and scenario flexibility.
Data Source
AI summary
A method for 5G digital beamforming testing includes receiving emulated UE spatial positions. The method includes computing phase vectors for the emulated UEs based on the emulated UE spatial positions and communicating the phase vectors to a DUT. The method includes receiving beam weight sets from the DUT and storing the beam weight sets. The method includes computing scores for the emulated UE spatial positions from the beam weight sets and the phase vectors, and receiving, from the DUT, spatial streams and identifiers of beam weight sets to be used to transmit the spatial streams to the emulated UEs. The method includes identifying, using scores corresponding to the beam weight sets to be used to transmit the spatial streams to the emulated UEs, associations between the spatial streams and the emulated UE spatial positions. The method includes processing data in the spatial streams using the emulated UEs.