Precoding Matrix Codebook for Micro Cell Adaptation
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Solution Overview
Problem
Existing LTE R8-R10 codebooks are inadequate for micro cell environments and active antenna systems, as they fail to adapt to the unique channel conditions and antenna configurations in these settings, leading to suboptimal communication performance.
Innovation Solution
A method for reporting channel state information that involves selecting a precoding matrix from a codebook, where the matrix is a product of three matrices (W1, Z, and W2), with W1 and Z being block diagonal matrices, each with specific structural elements that account for double-transmission conditions and antenna freedom in micro cell networks and active antenna systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing LTE R8-R10 codebooks are used, then the system maintains compatibility with conventional base station antenna configurations, but the codebooks fail to adapt to micro cell environments and active antenna systems, leading to suboptimal communication performance
Solution Approach 1:
The patent modifies the codebook structure by introducing a three-matrix product form (W = W1 × Z × W2) with specific block diagonal structures, changing the parameters of the precoding matrix to adapt to micro cell and active antenna system environments while maintaining compatibility with existing systems
Solution Approach 2:
The precoding matrix is segmented into three separate matrices (W1, Z, W2) where W1 and Z are block diagonal matrices with specific structures. This segmentation allows independent optimization of different codebook components to address specific environmental requirements while maintaining overall system compatibility
2Adaptability or versatility
If a conventional base station antenna with fixed tilt angle is used, then the horizontal beam direction can be adjusted dynamically, but the perpendicular antenna beam cannot be adjusted, limiting adaptability to double-transmission conditions
Solution Approach 1:
The patent introduces dynamic adjustability to the previously fixed perpendicular antenna beam by incorporating block diagonal matrices with adjustable phases and amplitudes in the codebook structure, enabling real-time adaptation to double-transmission conditions while maintaining horizontal beam adjustability
3Ease of manufacture
If LTE R8-R10 codebooks designed for macro cell systems are applied to micro cell environments, then the existing codebook structure is maintained, but the codebooks cannot adapt to the unique channel conditions and antenna configurations in micro cell networks
Solution Approach 1:
The patent applies local quality by making different parts of the codebook structure serve different functions: W1 handles horizontal beamforming, Z handles perpendicular beamforming with block diagonal structure, and W2 handles spatial precoding. This allows the codebook to adapt to local micro cell conditions while maintaining overall structural integrity
Data Source
AI summary
Embodiments of the present invention provide a method includes: receiving a reference signal sent by a base station; selecting, based on the reference signal, a precoding matrix from a codebook, where a precoding matrix W included in the codebook is a product of three matrices being W1, Z, and W2, that is, W=W1ZW2, where both W1 and Z are block diagonal matrices, W1=a formula (I), Z=a formula (II), each of W1 and Z includes at least one block matrix, that is, NB≥1, and each column of each block matrix Zi in the matrix Z has the following structure formula (III); and sending a precoding matrix indicator PMI to the base station, where the PMI corresponds to the selected precoding matrix, and is used by the base station to obtain the selected precoding matrix W according to the PMI.