Asymmetrical Channel Feedback for Coordinated MIMO Transmission
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Solution Overview
Problem
In MIMO communication systems, the volume of feedback data from mobile terminals to base stations consumes significant uplink bandwidth, degrading system capacity and performance.
Innovation Solution
The method involves formulating feedback data for different communication channels with varying data sizes, based on criteria such as feedback parameters, quantization levels, spectral resolution, and update rates, allowing for accurate feedback where needed while reducing overall bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback data is transmitted for all communication channels with uniform data size, then measurement precision is maintained, but uplink bandwidth consumption increases
Solution Approach 1:
The patent applies local quality by assigning different feedback data sizes to different communication channels based on their individual characteristics. Specifically, the first communication channel receives feedback data with a first data size while the second communication channel receives feedback data with a second data size that is different from the first. This allows the system to allocate feedback resources locally according to channel needs, maintaining necessary measurement precision for each channel while avoiding uniform over-provisioning that would consume excessive uplink bandwidth.
Solution Approach 2:
The patent implements asymmetry by deliberately creating unequal feedback data sizes for different communication channels. The feedback data for the first channel and the feedback data for the second channel are intentionally made asymmetric in terms of data size. This asymmetric approach allows the system to optimize the balance between measurement precision and bandwidth consumption by tailoring feedback granularity to the specific requirements of each channel rather than applying a symmetric uniform standard to all channels.
2Quantity of substance
If feedback data size is reduced for all channels, then uplink bandwidth usage decreases, but measurement precision deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying local quality, where each communication channel receives feedback data with a data size appropriately matched to its specific requirements. The first communication channel receives feedback data with a first data size and the second communication channel receives feedback data with a second data size, allowing each channel to maintain adequate measurement precision while the overall system optimizes uplink bandwidth usage by avoiding unnecessary feedback data transmission for channels that require less precision.
3Device complexity
If uniform feedback data size is used for all communication channels, then system complexity is reduced, but feedback efficiency decreases
Solution Approach 1:
The patent improves feedback efficiency through local quality by tailoring feedback data sizes to the specific needs of each communication channel. The first feedback data and second feedback data are formulated with different data sizes according to the characteristics of their respective channels. This localized optimization enhances feedback efficiency by ensuring that each channel receives appropriate feedback granularity without unnecessarily increasing overall system complexity, as the differentiation is based on channel-specific requirements rather than arbitrary complexity.
Data Source
AI summary
A method includes, in a mobile communication terminal, receiving from at least first and second base stations, which cooperate in a coordinated transmission scheme, signals that are transmitted over respective first and second communication channels. Respective channel measures are calculated for the communication channels based on the received signals. First and second feedback data, which are indicative of the respective channel measures of the first and second communication channels, are formulated such that the first feedback data has a first data size and the second feedback data has a second data size, different from the first data size. The first and second feedback data are transmitted from the mobile communication terminal to at least one of the base stations.