Pilot Resource Configuration for Accurate CSI Feedback
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Solution Overview
Problem
In multi-antenna wireless communication systems, especially in hybrid beamforming structures, user terminals often provide incomplete or inaccurate channel state information (CSI) during multi-user pairing and data transmission, due to inconsistencies in antenna configurations and beam measurements.
Innovation Solution
A method involving the base station configuring and transmitting multiple sets of pilot resources in different transmission modes to user terminals, allowing for accurate feedback of CSI, which includes configuring K1 sets of pilot resources of a first type and K2 sets of pilot resources of a second type, and receiving corresponding feedback information to enhance CSI accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sets of pilot resources are configured in different transmission modes, then CSI measurement accuracy is improved, but system complexity and overhead increase
Solution Approach 1:
The patent segments the pilot resources into multiple sets (K1 sets of first type and K2 sets of second type), where each set corresponds to different transmission modes. This segmentation allows the system to measure CSI for different beamforming configurations separately, improving measurement accuracy while organizing the complexity into manageable segments rather than a monolithic complex system
Solution Approach 2:
The patent performs preliminary beamforming measurements by configuring and transmitting multiple sets of pilot resources before actual data transmission. The terminal measures CSI on these pre-configured pilot resources and feeds back the results, allowing the base station to determine the optimal transmission mode in advance. This preliminary action separates the complex measurement process from the data transmission process, improving overall system efficiency
2Loss of information
If multiple sets of pilot resources are configured in different transmission modes, then CSI feedback completeness is improved, but feedback overhead increases
Solution Approach 1:
The patent performs preliminary CSI measurements and feedback on multiple sets of pilot resources configured for different transmission modes. The terminal feeds back CSI information for each pilot resource set, providing the base station with complete CSI knowledge before data transmission. This preliminary feedback action ensures that all necessary CSI information is obtained in advance, avoiding information loss during actual data transmission
Solution Approach 2:
The patent uses multiple sets of pilot resources as copies or representations of different transmission mode configurations. Each pilot resource set contains embedded CSI information that replicates the channel characteristics under specific beamforming conditions. By measuring and feeding back CSI on these pilot copies, the system obtains comprehensive CSI information without needing to transmit actual data in all possible modes, thus reducing overall feedback overhead
Data Source
AI summary
A method for pilot configuration includes: a base station configuring K1 sets of pilot resources of a first type and K2 sets of pilot resources of a second type; the base station transmitting the K1 sets of pilot resources of the first type to a terminal in a first transmission mode, and transmitting the K2 sets of pilot resources of the second type to the terminal in a second transmission mode; and the base station receiving a first type of feedback information fed back by the terminal according to the measurement of the pilot resources of the first type, and receiving a second type of feedback information fed back by the terminal according to the measurement of the pilot resources of the second type, wherein K1 and K2 are integers equal to or greater than 1.