Terminal Apparatus CSI Calculation Using Spatial QCL
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Solution Overview
Problem
In high-frequency bands, beamforming in 5G communication systems faces challenges with reliability and frequency utilization efficiency due to channel cutoffs from obstacles and high spatial correlation in Line of Sight environments, especially when carrier aggregation is used, leading to increased resource requirements.
Innovation Solution
A terminal apparatus and base station apparatus configuration that calculates Channel State Information (CSI) for component carriers using the same reception parameters when configured for spatial Quasi-co-location (QCL), optimizing beamforming efficiency through coordinated CSI calculation across component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If beamforming is used in high frequency bands, then path loss is compensated, but reliability deteriorates due to channel cutoff from blocking
Solution Approach 1:
The patent segments the communication resources by dividing component carriers into different groups based on their spatial QCL relationships. This segmentation allows the system to independently manage and optimize resource allocation for each group, enabling reliable communication even when certain carriers experience channel cutoff due to blocking.
Solution Approach 2:
The patent changes the parameter of spatial QCL configuration between component carriers. By configuring or releasing spatial QCL relationships dynamically, the system can adapt to changing channel conditions, maintaining reliability when blockage occurs by switching to carriers without spatial QCL that may have different propagation characteristics.
2Productivity
If carrier aggregation with multiple component carriers is used, then capacity is increased, but resource requirements increase
Solution Approach 1:
The patent applies universality by allowing a single reception parameter to serve multiple component carriers through spatial QCL configuration. When spatial QCL is configured between carriers, the same reception parameter (such as receive beam) can be used across multiple carriers, reducing the total number of resources required while maintaining increased capacity through carrier aggregation.
3Device complexity
If spatial QCL is configured between component carriers, then resource efficiency is improved, but adaptability to different channel conditions deteriorates
Solution Approach 1:
The patent introduces dynamics by allowing the spatial QCL configuration to be changed over time. The network can configure spatial QCL relationships between component carriers dynamically based on channel conditions, and can also release these configurations when conditions change. This dynamic approach enables the system to adapt to different channel conditions while maintaining resource efficiency when spatial QCL is appropriate.
4Productivity
If beamforming is used in Line of Sight environments, then throughput is improved, but spatial correlation increases causing low rank communication
Solution Approach 1:
The patent segments component carriers into different groups based on their spatial QCL relationships, allowing the system to identify and utilize carriers with different spatial characteristics. In LOS environments where spatial correlation causes low rank communication on certain carriers, the segmentation enables the system to identify alternative carriers that may have lower spatial correlation and maintain higher effective throughput.
Data Source
AI summary
A terminal apparatus and a communication method are provided. The terminal apparatus communicates with a base station apparatus. The terminal apparatus includes a receiver and a measurement unit. The receiver is configured to receive downlink signals and configuration information in a first component carrier and a second component carrier. The measurement unit is configured to calculate Channel State Information (CSI) of the first component carrier and the second component carrier. In a case that spatial Quasi-coloration (QCL) for reception parameters is configured between the first component carrier and the second component carrier in the configuration information, the CSI of the first component carrier and the CSI of the second component carrier are calculated with a same reception parameter.