Adaptive Modulation Coding Base Station Subframe Interference
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Solution Overview
Problem
Existing adaptive modulation and coding mechanisms in LTE systems fail to adapt to real-time changes in interference from neighboring cells, leading to inefficient data transmission and reduced network throughput due to the reliance on a single CQI adjustment amount for all subframes, regardless of varying signal-to-noise ratios.
Innovation Solution
The method involves dividing scheduling subframes into two sets based on interference levels, with different CQI adjustment amounts for each set, allowing the base station to dynamically adjust the CQI and modulation and coding schemes based on the subframe set to which each subframe belongs, thereby optimizing the use of high signal-to-noise ratios in low-interference subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single CQI adjustment amount is used for all subframes, then the AMC mechanism can be simplified and easier to implement, but it cannot adapt to real-time changes in interference from neighboring cells, leading to reduced data transmission efficiency and network throughput
Solution Approach 1:
The patent divides subframes into two distinct sets: a first subframe set where the CQI adjustment amount is determined by the AMC mechanism, and a second subframe set where the CQI adjustment amount is determined by interference information from neighboring cells. This segmentation allows the system to apply different adjustment strategies to different subframes, improving adaptability to interference changes while maintaining manageable complexity through structured classification.
Solution Approach 2:
The patent applies different CQI adjustment amounts to different subframe sets based on their specific interference characteristics. For the second subframe set experiencing strong interference from neighboring cells, a different adjustment amount is applied compared to the first subframe set. This local quality approach ensures that each subframe receives appropriately tailored CQI adjustment, optimizing data transmission efficiency for each specific interference condition.
2Productivity
If CQI adjustment is based on strongly interfered subframes only, then the AMC mechanism remains simple, but high signal-to-noise ratio subframes waste their potential and overall transmission efficiency decreases
Solution Approach 1:
The patent segments subframes into first and second sets based on interference characteristics, allowing separate CQI adjustment strategies. This ensures that high signal-to-noise ratio subframes in the first set are not penalized by adjustment amounts derived from strongly interfered subframes in the second set, thereby preventing waste of transmission potential and improving overall data transmission efficiency.
Solution Approach 2:
The patent applies locally optimized CQI adjustment amounts to different subframe sets. For the first subframe set with better channel conditions, the CQI adjustment reflects actual local conditions rather than being dragged down by interference from the second set. This local quality approach maximizes the utilization of high signal-to-noise ratio resources while still maintaining appropriate adjustments for interfered subframes.
Data Source
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AI summary
The present invention provides an adaptive modulation and coding method and a base station. The method includes: receiving, by a base station, a channel quality indicator CQI sent by a first terminal; determining, by the base station, a subframe for scheduling the first terminal; determining, by the base station, a subframe set to which the subframe belongs, where the subframe set is a first subframe set or a second subframe set, and the first subframe set and the second subframe set correspond to different CQI adjustment amounts; adjusting, by the base station, the CQI based on a CQI adjustment amount corresponding to the subframe set to which the subframe belongs; and determining, by the base station based on an adjusted CQI, a modulation and coding scheme MCS for scheduling the first terminal. In the present invention, the base station separately maintains the CQI adjustment amounts respectively corresponding to the first subframe set and the second subframe set. This is more flexible in comparison with the prior art. In this way, a waste of a high signal-to-noise ratio of a low-interference subframe caused by using only one set of CQI adjustment amount in the prior art is avoided, and the high signal-to-noise ratio of the low-interference subframe in a network can be efficiently used, thereby improving transmission efficiency of downlink data and a throughput of a network system.