Inter-cell Cooperative Feedback Codebook Design for Wireless Systems
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Solution Overview
Problem
In cellular radio communication systems, high-level inter-cell cooperative transmission faces limitations due to conventional codebook designs that fail to enhance received signal performance and efficiently transmit feedback information, particularly for users at cell boundaries, where channel state information is time-varying and interference from neighboring cells degrades signal quality.
Innovation Solution
A codebook-based feedback information transmission and reception method that identifies preferred collaborative cells, generates feedback information including rank indicators, precoding matrix indicators, and channel quality indicators, and transmits this information to improve high-level inter-cell cooperative transmission by supporting both single and multiple cell-intended codebooks, allowing for efficient management of high-level inter-cell cooperative transmission systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional codebook designs are used for inter-cell cooperative transmission, then the system structure is simple, but the received signal gain is insufficient and feedback information transmission efficiency is degraded
Solution Approach 1:
The codebook is segmented into multiple codebooks, each corresponding to a specific collaborative cell. The terminal device selects different codebooks based on which collaborative cell has the best channel quality, allowing the system to adapt to different channel conditions without requiring a single complex codebook that covers all possible scenarios.
Solution Approach 2:
The codebook selection is made dynamically based on real-time channel state information. The terminal device determines the best collaborative cell and selects the corresponding codebook adaptively, enabling the system to respond to time-varying channel conditions and maximize received signal gain under different scenarios.
2Productivity
If multiple cell-intended codebooks are supported, then feedback information transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The feedback information transmission is segmented into multiple modes, each optimized for specific scenarios. The terminal device selects the appropriate feedback mode based on the number of collaborative cells and channel conditions, allowing efficient feedback transmission without requiring the system to handle all possible complex scenarios simultaneously.
Solution Approach 2:
The system implements partial codebook support based on the actual number of collaborative cells. When only one collaborative cell is present, only that cell's codebook is used. When multiple collaborative cells are present, the system selectively activates the necessary codebooks, avoiding the complexity of implementing all possible codebook combinations while still improving feedback efficiency.
Data Source
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AI summary
A method for transmitting feedback information for cooperative transmission in a wireless communication cellular system comprises: receiving information on cells that can be cooperatively transmitted from a base station; determining cells that prefer the cooperative transmission among the cells that can be cooperatively transmitted; generating feedback information, which includes a preference cell indicator representing preferred cells and non-preferred cells for the cooperative transmission among the cells that can be cooperatively transmitted, precoding matrix information for the respective cell that can be cooperatively transmitted, phase information representing a phase correction value of each of the preferred cells for the cooperative transmission, and a channel quality indicator; and transmitting the feedback information through a control channel or a data channel. Accordingly, the present invention provides a method and apparatus for transmitting and receiving a report of implicative feedback information on code books that can be designed for the gain improvement of a high-level inter-cell cooperative transmission.