3D MIMO Channel State Information Feedback via 2D Antenna Array Segmentation
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently feeding back channel state information for 3D MIMO, particularly in supporting advanced transmission schemes like large delay-cyclic delay diversity (LD-CDD) and managing channel state information reporting effectively.
Innovation Solution
A method and apparatus for reporting channel state information in a wireless communication system that configures a 2D antenna array transmission mode, receives indicators for transmission schemes, and calculates CSI, allowing for DM-RS based LD-CDD and closed-loop multiplexing transmission schemes, enabling efficient CSI feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 3D MIMO transmission schemes (LD-CDD and closed-loop multiplexing) are implemented, then transmission diversity and communication efficiency are improved, but channel state information feedback complexity and device requirements increase
Solution Approach 1:
The patent segments the channel state information feedback into different types: Type 1 feedback for closed-loop multiplexing and Type 2 feedback for LD-CDD transmission. This segmentation allows the system to manage complexity by providing feedback only when needed for specific transmission modes, rather than requiring comprehensive feedback for all possible transmission schemes simultaneously.
Solution Approach 2:
The patent introduces dynamic transmission mode indication through higher layer signaling that adapts between different transmission schemes (closed-loop multiplexing and LD-CDD) based on channel conditions. This dynamic adaptation allows the system to optimize performance while managing feedback complexity by switching between transmission modes rather than maintaining all modes active simultaneously.
2Adaptability or versatility
If 2D antenna array transmission mode is configured with multiple transmission schemes, then transmission flexibility and adaptability are improved, but system configuration and management complexity increase
Solution Approach 1:
The patent implements a unified channel state information feedback mechanism that serves multiple transmission schemes (both closed-loop multiplexing and LD-CDD) through a single type 2 feedback structure. This universal feedback approach allows the system to maintain transmission flexibility across different modes while avoiding the need for separate feedback mechanisms for each scheme, thereby reducing overall configuration complexity.
Solution Approach 2:
The patent employs preliminary configuration through higher layer signaling that pre-establishes the transmission mode indicator before actual data transmission. This preliminary setup allows the UE to know in advance which transmission scheme will be used, enabling proper feedback generation without requiring complex real-time configuration management during the transmission process.
Data Source
AI summary
A method of reporting channel state information to a base station at a user equipment (UE) in a wireless communication system is disclosed. The method includes configuring a two-dimensional (2D) antenna array transmission mode of a downlink data channel via a higher layer, receiving an indicator corresponding to one of transmission schemes of the downlink data channel via the higher layer, calculating the channel state information on the assumption of one transmission scheme of the downlink data channel corresponding to the indicator, and reporting the calculated channel state information to the base station. The transmission schemes of the downlink data channel include a demodulation-reference signal (DM-RS) based large delay (LD) cyclic delay diversity (CDD) transmission scheme and a closed loop multiplexing transmission scheme in the 2D antenna array transmission mode.