3D Pre-coding Matrix Design for Vertical Beam Optimization
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Solution Overview
Problem
The existing codebook designed for horizontal beam-forming/pre-coding in LTE Rel-8 systems degrades performance when directly applied to 3D beam-forming/pre-coding due to its inability to optimize vertical beam adjustments, which are crucial for improving spectrum efficiency in wireless communications.
Innovation Solution
A method and system for transmitting and determining a pre-coding matrix by using a combination of block diagonal matrices and weighted column selection vectors, allowing for the construction of a pre-coding matrix that better matches 3D channel conditions, involving a user equipment and network side device that determine and transmit first, second, and third pre-coding indicators to form a pre-coding matrix as a product of component matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the existing codebook designed for horizontal beam-forming/pre-coding is directly applied to 3D beam-forming/pre-coding, then the device complexity is reduced, but the system performance and spectrum efficiency deteriorate due to inability to optimize vertical beam adjustments
Solution Approach 1:
The codebook is segmented into multiple sub-codebooks corresponding to different vertical beam directions. Each sub-codebook contains horizontal beam-forming vectors tailored to specific vertical angles, allowing the system to select the appropriate sub-codebook based on the desired vertical beam direction, thereby optimizing spectrum efficiency without excessive complexity
Solution Approach 2:
The patent extends the traditional horizontal beam-forming codebook to three dimensions by incorporating vertical beam directions. This is achieved by organizing codebook vectors according to both horizontal and vertical spatial dimensions, enabling 3D beam-forming while maintaining a structured approach that manages complexity
2Device complexity
If a common vertical down tilt angle is used for every user equipment, then the device complexity is reduced, but the system performance deteriorates due to lack of optimized vertical beam adjustments
Solution Approach 1:
The system dynamically adjusts vertical beam directions for different user equipments based on channel conditions and spatial requirements. Each user equipment can be assigned a specific vertical beam direction from multiple available options, allowing adaptive optimization of system performance rather than using a fixed common tilt angle
Solution Approach 2:
Different vertical beam directions are assigned to different user equipments based on their specific spatial locations and channel characteristics. This localized optimization ensures that each user equipment receives the most appropriate vertical beam adjustment, improving overall system performance while maintaining manageable complexity
Data Source
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AI summary
The present application relates to the technical field of radio communications, and relates specifically to a method, system, and device for transmitting coding instruction information and for determining a pre-coding matrix, for use in solving the problem that direct application of current codebooks to a three-dimensional beamforming/pre-coding technology causes performance degradation. The method of embodiments of the present application comprises: a user equipment determines and transmits first pre-coding instruction information, second pre-coding instruction information, and third pre-coding instruction information, where the first pre-coding instruction information, the second pre-coding instruction information, and the third pre-coding instruction information correspond to a pre-coding matrix, a first component pre-coding matrix is a block diagonal matrix, a third component pre-coding matrix is constituted by a weighted column selection vector, and, with the exception of a P-number of nonzero elements, the remainder of the weighted column selection vector is all zeros. Employment of the solution of the embodiments of the present application increases the performance of the three-dimensional beamforming/pre-coding technology.