Inter-band Carrier Aggregation Beam Training
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Solution Overview
Problem
Wireless communications systems operating in the millimeter wave (mmWave) band face significant challenges due to high signal attenuation, penetration loss, and blockage loss, which are not effectively addressed by existing beamforming techniques.
Innovation Solution
The method involves allocating overlapping sets of reference signal (RS) symbols in different frequency bands for beam training, allowing for simultaneous beam sweeping and signal measurement by both base stations and user equipment to determine optimal beam pairs for improved signal directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If beamforming is employed to compensate for high signal attenuation in mmWave band, then signal directivity is improved, but device complexity increases due to the need for beam training procedures
Solution Approach 1:
The patent combines beam training for multiple frequency bands into a single unified procedure by allocating overlapping reference signal symbols in time. This merging approach allows the UE to perform beam sweeping and measurements across first and second frequency bands simultaneously using the same time resources, thereby reducing overall beam training complexity while maintaining improved signal directivity through beamforming in both bands.
2Measurement precision
If beam training is performed separately in different frequency bands, then measurement precision is improved, but loss of time increases due to sequential training procedures
Solution Approach 1:
The patent implements continuous useful action by allocating reference signal symbols for beam training in first and second frequency bands that overlap in time. This allows the UE to continuously perform beam sweeping and measurements across both frequency bands without idle gaps, maintaining measurement precision through comprehensive sampling while minimizing time loss by eliminating sequential execution delays.
3Productivity
If overlapping reference signal symbols are allocated in time for multiple frequency bands, then productivity is improved by reducing beam training duration, but device complexity increases due to coordinated resource allocation
Solution Approach 1:
The patent applies segmentation by dividing the beam training process into distinct reference signal symbol allocations for first and second frequency bands, with each band having its own set of RS symbols that overlap in time. This segmentation allows independent optimization of resource allocation for each band while the overlapping structure ensures coordinated execution, thereby improving overall productivity without excessive complexity increase.
Data Source
AI summary
Inter-band CA beam training may include performing inter-band CA beam training for a first frequency band and inter-band CA beam training for a second frequency band between one or more base stations and a user equipment simultaneously.