Joint Codebook Coordination for Mobile Active Base Station Sets
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Solution Overview
Problem
In wireless communication systems transitioning to 5G and 6G, UE mobility causes frequent changes in the base stations included in an Active Coordination Set (ACS), necessitating dynamic adjustments in codebooks for effective precoding feedback by user equipment (UE).
Innovation Solution
A base station generates a joint-codebook for an ACS based on capability information from other base stations, which is then jointly transmitted to the UE, allowing for precoding matrix indicator feedback and joint processing of downlink data to enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE mobility is allowed to enable flexible communication, then adaptability is improved, but the composition of ACS changes frequently causing codebook updates and reducing system stability
Solution Approach 1:
The patent implements dynamic codebook generation where the codebook is updated whenever the ACS composition changes. The base station dynamically determines the codebook based on the current ACS members' capability information, allowing the system to adapt to UE mobility while maintaining phase coherence through continuous codebook updates synchronized with ACS changes.
2Manufacturing precision
If joint-codebook is generated based on capability information from multiple base stations, then coordination accuracy is improved, but the complexity of codebook generation increases
Solution Approach 1:
The patent segments the codebook generation process by having each base station in the ACS independently determine and provide its own capability information (such as antenna configuration and phase coherence capability). The coordinating base station then aggregates this segmented information to generate the joint codebook, distributing the complexity across multiple base stations rather than requiring a single complex centralized computation.
3Reliability
If phase coherence is maintained among base stations, then signal quality is improved, but the system complexity for coordinating phase increases
Solution Approach 1:
The patent uses capability information exchanged between base stations to determine phase coherence parameters. Each base station provides parameters indicating its phase coherence capability, and the coordinating base station uses these parameters to generate appropriate precoding matrices in the joint codebook. This parameter-based approach maintains phase coherence for coherent beamforming while avoiding complex real-time phase adjustment mechanisms.
Data Source
AI summary
This document describes methods, devices, systems, and means for determining a joint-codebook for wireless communication with a user equipment, UE, by a base station in an active coordination set, ACS, in which a base station receives capability information from one or more other base stations in the ACS. The base station generates a joint-codebook for the ACS based on the received capability information and sends the joint-codebook to the one or more other base stations in the ACS. The base station and the other base stations in the ACS jointly-transmit the joint-codebook to the UE and receive Precoding Matrix Indicator, PMI, feedback from the UE. The base station and the other base stations in the ACS jointly-process downlink data for the UE using the PMI feedback and the joint-codebook and jointly-transmit the downlink data to the UE.