CJT Codebook Reference Signaling for Precoding Matrix Reporting
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing channel status information reference signals to optimize data transmission, particularly in terms of spectral efficiency and energy consumption, while maintaining high quality of service and reduced latency.
Innovation Solution
The implementation of coherent joint transmission (CJT) codebook structures and configurations, including the determination and transmission of precoding matrix indicators based on channel status information reference signal port groups, allows for optimized precoding matrix determination and reporting, enhancing frequency domain unit management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple channel status information reference signal port groups are used for data transmission, then data transmission capacity is improved, but management complexity of precoding matrices increases
Solution Approach 1:
The patent divides the precoding matrix management into segmented groups corresponding to different channel status information reference signal port groups. Each group has its own precoding matrix configuration, allowing independent management and optimization. This segmentation enables the system to handle multiple port groups efficiently by treating each group as a manageable unit with specific precoding requirements.
Solution Approach 2:
The patent introduces a frequency domain dimension by defining first type frequency domain units and associating precoding matrix indicators with these units. This dimensional approach allows the system to manage precoding matrices across multiple port groups by organizing them in a structured frequency-domain framework, reducing the overall management complexity.
2Measurement precision
If precoding matrix indicators with vector information are transmitted for each frequency domain unit, then data transmission precision is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by transmitting precoding matrix indicators only for first type frequency domain units that require precise precoding management. Not all frequency domain units need full precoding matrix indicators - only those where precision is critical. This selective approach maintains transmission precision where needed while reducing overall signaling overhead.
Solution Approach 2:
Instead of transmitting complete precoding matrices, the patent inverts the approach by transmitting compact precoding matrix indicators that reference predefined codebooks. This inversion from full matrix transmission to indicator-based referencing significantly reduces signaling overhead while preserving the essential precision information needed for accurate precoding.
Data Source
AI summary
Structures and configurations for coherent joint transmission (CJT) codebook are disclosed. In an implementation, a method of wireless communication includes determining, by a communication device, N channel status information reference signal port groups, wherein N is a positive integer, receiving, by the communication device, channel status information reference signals on the N channel status information reference signal port groups, determining, by the communication device, C precoding matrices based on the received channel status information reference signals on the N channel status information reference signal port groups, wherein C is a positive integer, and transmitting, by the communication device, a report including a precoding matrix indicator that includes information about a first type of vector, wherein the first type of vector includes C elements, and each of the C elements corresponds to one first type of frequency domain unit.