Multi-TRP Antenna Calibration Using Measurement Gaps
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately calibrating antenna elements in multi-TRP scenarios due to mismatches in RF pathways, leading to inefficiencies in beamforming performance, particularly in mmWave communications.
Innovation Solution
A network-assisted antenna calibration method where base stations coordinate UEs to perform measurements during measurement gaps, using different receive beams to calibrate TRP antenna elements based on UE reports, and communicate results via backhaul networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If online antenna calibration is performed in multi-TRP scenarios, then beamforming accuracy is improved, but device complexity and coordination overhead increase
Solution Approach 1:
The calibration process is segmented into distinct phases: measurement gap configuration, reference signal transmission coordination, UE measurement execution, and calibration parameter calculation. This segmentation allows each TRP to perform calibration independently using local measurements from UEs, reducing the need for complex inter-TRP coordination while maintaining calibration accuracy.
Solution Approach 2:
Measurement gaps are configured in advance and reference signal resources are pre-coordinated among TRPs before calibration execution. This preliminary setup enables UEs to perform measurements during predetermined time windows without requiring real-time coordination during the actual calibration process, thereby reducing operational complexity.
2Measurement precision
If measurement gaps are configured for antenna calibration, then calibration accuracy is improved, but communication productivity decreases due to interrupted data transmission
Solution Approach 1:
Measurement gaps are configured periodically rather than continuously, allowing calibration measurements to be performed at scheduled intervals while maintaining normal data transmission during non-gap periods. This periodic approach minimizes the impact on overall system productivity while ensuring calibration accuracy is maintained through regular updates.
Solution Approach 2:
Only specific resource elements within the measurement gaps are dedicated to calibration reference signals, while other resources remain available for data transmission. This partial action approach ensures sufficient measurement accuracy without completely interrupting data flow, thereby balancing calibration needs with productivity requirements.
3Reliability
If multiple UEs are selected for calibration measurements, then measurement reliability is improved, but power consumption and thermal overhead of UEs increase
Solution Approach 1:
The system selects specific UEs based on their local conditions such as channel quality, location relative to TRPs, and current traffic load. Rather than requiring all UEs to participate, only those with favorable local conditions are selected for measurements, improving measurement reliability while minimizing the number of UEs experiencing increased power consumption and thermal overhead.
Data Source
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AI summary
A base station may perform online calibration of antenna elements at two or more transmission reception points (TRPs) based on measurements by one or more user equipment (UEs). The base station may transmit a request for the one or more UEs to perform antenna calibration measurements, for the two or more TRPs, during measurement gaps. The base station may coordinate, among the two or more TRPs, transmission of reference signals during the measurement gaps. The base station may receive a report based on the antenna calibration measurements from the one or more UEs. The base station may calibrate one or more antenna elements of the two or more TRPs based on the antenna calibration measurements.