Beam Feedback Mechanism for Millimeter Wave Diversity Gain
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Solution Overview
Problem
In millimeter wave communication systems, the existing beam feedback methods fail to effectively provide correlation information between beams, leading to decreased diversity and multiplexing gain due to the inability of the receiving end to accurately feed back channel state information and beam indexes to the sending end.
Innovation Solution
The proposed method involves a receiving end that receives reference signals carried on one or more beams, obtains beam indexes and channel state information, and feeds back a set including these indices and information to the sending end, allowing for accurate and flexible data transmission by grouping reference signals with time-frequency-code resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple beam pairs are generated for spatial diversity or multiplexing gain, then the system attempts to improve diversity and multiplexing gain, but the beam pairs may be from the same physical path with very strong correlation, reducing the effectiveness of diversity gain
Solution Approach 1:
The patent implements a feedback mechanism where the receiving end feeds back beam correlation information to the sending end. The receiving end calculates correlation coefficients between different beam pairs and transmits this information back, enabling the sending end to select beam pairs with lower correlation for data transmission, thereby resolving the contradiction between generating multiple beam pairs and maintaining diversity gain effectiveness
Solution Approach 2:
The patent replaces traditional mechanical beam selection methods with an information-theoretic approach using correlation coefficient calculation and feedback. Instead of relying on physical beam diversity alone, the system uses mathematical correlation measurement and feedback control to achieve superior diversity gain, substituting physical mechanisms with information processing mechanisms
2Measurement precision
If the receiving end feeds back channel state information and beam indexes, then the sending end can perform accurate data transmission, but the existing feedback scheme fails to provide effective correlation information between beams
Solution Approach 1:
The patent enhances the feedback mechanism by having the receiving end calculate and feed back correlation coefficients between beam pairs, in addition to traditional channel state information. This enriched feedback provides the sending end with both the channel state and the correlation characteristics, enabling accurate beam selection while resolving the information loss problem
Solution Approach 2:
The patent segments the feedback information into distinct components: channel state information (CQI, PMI) and beam correlation information (correlation coefficients). This segmentation allows the system to transmit both types of information separately and efficiently, preventing information loss while maintaining measurement precision
3Device complexity
If beam pairs with high correlation are selected for data transmission, then the system can maintain simple feedback mechanisms, but the diversity and multiplexing gain decrease due to inability to exploit correlation characteristics
Solution Approach 1:
The patent uses feedback to dynamically adjust beam selection based on correlation information. The receiving end feeds back correlation coefficients, and the sending end uses this information to select optimal beam pairs, achieving high multiplexing gain without excessive complexity through intelligent feedback-driven decision making
Solution Approach 2:
The patent changes the selection parameter from simply choosing beam pairs with highest signal strength to choosing beam pairs with optimal correlation characteristics. By using correlation coefficients as the selection criterion, the system achieves superior multiplexing gain while keeping the feedback mechanism relatively simple
Data Source
AI summary
Presented herein are systems and methods for beam information feedback. A first communication node may receive, from a second communication node, a group of reference signals that are carried either on respective beams or on a same beam. The group of reference signals may be determined based on one or more time-frequency-code resources. The first communication node may determine, based on the group of reference signals, one or more beam indexes and channel state information. The first communication node may transmit, to the second communication node, a set including the one or more beam indexes and the channel state information.