UE Inter-Band Beam Correspondence Testing with EIRP Criteria
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Solution Overview
Problem
Existing methods for determining beam correspondence in wireless communications are limited to testing within the same frequency band, failing to ensure that user equipment (UE) supports inter-band beam correspondence, which is crucial for efficient beam management, especially in high-frequency bands like millimeter waves.
Innovation Solution
A method and apparatus for testing inter-band downlink/uplink beam correspondence by transmitting signals in a first frequency band, measuring effective isotropic radiation power (EIRP) in a second higher frequency band, and determining if UE transmit beams satisfy predefined criteria for beam correspondence requirements, including minimum peak EIRP and spherical coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam correspondence testing is performed only within the same frequency band, then the testing procedure is simple, but the UE's inter-band beam correspondence capability cannot be ensured
Solution Approach 1:
The testing procedure is segmented into distinct phases: first transmitting reference signals in a first frequency band, then transmitting sounding reference signals in a second frequency band, and finally measuring EIRP values. This segmentation allows comprehensive inter-band beam correspondence testing while maintaining procedural clarity and manageability
Solution Approach 2:
The base station transmits reference signals in the first frequency band before transmitting sounding reference signals in the second frequency band. This preliminary action establishes a baseline for beam correspondence that enables subsequent measurement and verification of inter-band beam alignment
2Measurement precision
If multiple UE transmit beams are measured in the second frequency band, then beam correspondence accuracy is improved, but measurement time and complexity increase
Solution Approach 1:
The procedure measures EIRP values for multiple UE transmit beams (excessive action) to ensure accurate beam correspondence determination. By measuring more beams than the minimum single beam, the system achieves higher measurement precision while the time overhead remains acceptable due to efficient measurement procedures
3Measurement precision
If EIRP measurements are performed for multiple signals across different frequency bands, then beam alignment accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The procedure extracts and measures only the critical EIRP values from the multiple transmitted signals. By focusing measurement efforts on the essential parameters (EIRP of reference signals and sounding reference signals) rather than processing all signal characteristics, the system achieves accurate beam alignment verification while minimizing processing overhead
Data Source
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AI summary
Embodiment methods are provided to test whether a UE supports inter-band beam correspondence between two different frequency bands. In one embodiment, a tester transmits reference signals (RSs) to a UE in a first frequency band, and receives signals from the UE over a plurality of UE transmit beams in a second frequency band different than the first frequency band. The tester selects a beam from the plurality of UE transmit beams that corresponds to effective isotropic radiation power satisfying a predefined criterion, and determines that the UE supports inter-band beam correspondence between the first frequency band and the second frequency band, upon the selected beam satisfying a minimum peak EIRP requirement and a spherical coverage requirement in the second frequency band.