Multi-Point CSI Feedback for Mobile Communication Data Rate
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Solution Overview
Problem
In mobile communication systems, transmission from one transmission point to a UE is limited by data rate when the UE is far away or experiences strong interference from neighboring points, leading to inefficient use of radio resources.
Innovation Solution
A method and apparatus for transmitting and receiving downlink channel state information (CSI) that allows a UE to measure channel conditions from multiple transmission points, using CSI-reference signals and feedback configurations to determine and transmit channel quality indications (CQI) and control information, enabling efficient radio resource utilization across multiple points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission is performed from one transmission point to a UE, then the system structure is simple and easy to manage, but the data rate is limited when the UE is far away or experiences strong interference
Solution Approach 1:
The patent combines multiple transmission points to serve a single UE, merging their transmission capabilities to overcome the limitations of single-point transmission. This allows the system to achieve higher data rates by aggregating resources from multiple points while managing the complexity through coordinated feedback mechanisms.
Solution Approach 2:
The CSI feedback mechanism is designed to be universal, supporting both single-point and multi-point transmission scenarios. The same feedback structure can adapt to different transmission configurations, allowing the system to maintain simplicity in design while enabling enhanced functionality when needed.
2Measurement precision
If channel state information is measured from multiple transmission points, then the accuracy of channel quality indication is improved, but the amount of feedback information and processing complexity increases
Solution Approach 1:
The patent applies local quality by determining CQI values specific to each transmission point based on local channel conditions. Instead of a single aggregate measurement, the system evaluates channel quality independently for each transmission point, allowing precise local optimization while maintaining overall system efficiency.
Solution Approach 2:
The feedback information is segmented into separate CQI values for different transmission points. This segmentation allows the system to process and transmit channel quality information in a structured manner, reducing the complexity of handling large amounts of aggregated feedback data while maintaining measurement precision.
3Productivity
If the UE transmits CQI for multiple transmission points, then the radio resource allocation efficiency is improved, but the uplink control overhead increases
Solution Approach 1:
The patent changes the parameter representation by using differential CQI values or compact encoding schemes for multi-point feedback. Instead of transmitting full CQI values for each transmission point, the system uses parameter transformations that reduce the number of bits required while preserving the essential information for efficient resource allocation.
Data Source
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AI summary
Disclosed is a method and apparatus for transmitting channel state information (CSI) by a user equipment in a mobile communication system. The method includes receiving a CSI-reference signal (CSI-RS) for measuring a state of a downlink channel and a CSI feedback-related configuration from a base station (BS); determining a channel quality indication (CQI) for at least one transmission point and control information for determining a CQI for multiple transmission points, based on the received CSI-RS and CSI feedback-related configuration; and transmitting the determined CQI for the at least one transmission point and control information to the BS.