Terminal Feedback for Coordinated Transmitting Node Selection
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Solution Overview
Problem
In LTE-A systems, the conventional method of requiring terminals to feedback channel quality information (CQI) to all coordinated transmitting nodes increases uplink feedback overheads linearly with the number of nodes, hindering efficient dynamic point selection and system performance.
Innovation Solution
A method where a terminal measures and calculates spectral efficiency values for each coordinated transmitting node, selects a preferred node based on a comparison threshold, and sends only the information of this preferred node to the transmitting end, reducing the amount of feedback data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal feeds back channel quality information (CQI) to all coordinated transmitting nodes, then the transmitting end can obtain complete link quality information for each node, but the uplink feedback overhead increases linearly with the number of transmitting nodes
Solution Approach 1:
The patent extracts only the essential information needed for dynamic point selection by having the terminal calculate spectral efficiency values and compare them against a threshold, rather than feeding back all raw CQI data for every coordinated transmitting node. This selective extraction reduces feedback overhead while preserving the necessary information for optimal node selection.
Solution Approach 2:
The patent transforms the feedback parameter from raw channel quality information (CQI) to spectral efficiency values that have been processed through a calculation function. This parameter transformation consolidates multiple CQI measurements into a single comparative metric, reducing the dimensionality of feedback data while maintaining the ability to identify the optimal transmitting node.
2Reliability
If the terminal measures and feeds back CQI for all coordinated transmitting nodes, then the transmitting end can make informed selection decisions, but the processing complexity and feedback overhead increase significantly
Solution Approach 1:
The terminal performs preliminary calculations by computing spectral efficiency values for all coordinated transmitting nodes before feedback transmission. This preliminary processing consolidates multiple measurement parameters into a single comparative metric for each node, reducing the complexity of subsequent selection decisions at the transmitting end while maintaining selection accuracy.
Solution Approach 2:
The patent applies a threshold-based filtering mechanism where only spectral efficiency values meeting a predetermined criterion are fed back. This partial action approach avoids transmitting redundant information about nodes that cannot potentially be selected, reducing feedback overhead while preserving the reliability of the selection process for qualifying nodes.
Data Source
AI summary
A method for feeding back information includes: measuring a CQI of a link between each coordinated transmitting node in a coordinated transmitting node set and a terminal; using the CQI of and an RI value corresponding to the link between each coordinated transmitting node and the terminal as parameters of a spectral efficiency calculation function, and obtaining a spectral efficiency value corresponding to the link between each coordinated transmitting node and the terminal; when a value of the selection criterion function is less than or equal to a preconfigured comparison threshold value, selecting a corresponding coordinated transmitting node as a preferred coordinated transmitting node; and sending information of the preferred coordinated transmitting node to a transmitting end for selection. This may reduce uplink feedback overheads and enable the transmitting end to quickly determine the preferred coordinated transmitting node.