Joint AMC and MIMO Mode Adjustment for Wireless Throughput
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Solution Overview
Problem
Existing mobile communication systems face challenges in simultaneously maximizing data transmission rate and ensuring link reliability when adjusting downlink Adaptive Modulation and Coding (AMC) and Multiple Input and Multiple Output (MIMO) modes separately, as they do not consider the impact of one mode on the other, leading to suboptimal system stability and throughput.
Innovation Solution
A method and base station configuration that jointly adjust downlink AMC and MIMO modes based on the terminal-fed MIMO mode and Carrier to Interference plus Noise Ratio (CINR), within the maximum available Downlink Interval Usage Code (DIUC) range, using a joint adjustment table to optimize MIMO modes and DIUC combinations for increased spectral utilization and data transmission rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate adjustment of downlink AMC and MIMO modes is performed, then device complexity is reduced, but system throughput and link reliability cannot be maximized
Solution Approach 1:
The patent combines the separate adjustment processes of downlink AMC and MIMO modes into a unified joint adjustment mechanism. The base station simultaneously determines both AMC parameters (DIUC) and MIMO modes based on terminal feedback, allowing them to work together to maximize system throughput rather than being adjusted independently with suboptimal results.
Solution Approach 2:
The patent implements dynamic joint adjustment where the base station continuously adapts both AMC and MIMO configurations based on real-time channel conditions and terminal feedback. This dynamic coordination allows the system to respond flexibly to changing conditions and achieve optimal performance without excessive complexity.
2Reliability
If separate adjustment of downlink AMC and MIMO modes is performed, then adjustment process is simpler, but link reliability deteriorates
Solution Approach 1:
The patent merges the adjustment logic for AMC and MIMO into a coordinated decision-making process at the base station. By jointly determining DIUC and MIMO modes based on the same channel quality indicators and terminal feedback, the system ensures that AMC and MIMO configurations are compatible and work together to maintain link reliability.
Solution Approach 2:
The patent employs feedback mechanisms where the terminal provides MIMO mode feedback and channel quality information to the base station. The base station uses this feedback to jointly adjust both AMC and MIMO settings, creating a closed-loop system that continuously optimizes link reliability based on actual channel conditions.
3Productivity
If MIMO mode is increased to maximize data transmission rate, then productivity increases, but stability of the system deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of MIMO modes coupled with AMC parameters. The base station can flexibly switch between different MIMO modes (such as spatial multiplexing and space-time coding) and adjust DIUC values based on real-time channel conditions, allowing the system to maximize data transmission rate when conditions permit while maintaining stability when channel quality degrades.
Solution Approach 2:
The patent changes system parameters by coordinating MIMO mode selection with AMC parameter adjustment. When MIMO mode is increased to boost data transmission rate, the system simultaneously adjusts DIUC and other AMC parameters to maintain appropriate coding rates and modulation schemes, ensuring system stability is preserved even at higher transmission rates.
Data Source
AI summary
A method and base station for jointly adjusting downlink AMC and MIMO modes. The base station comprises an AMC module, a fast feedback module and a joint adjustment module. The method comprises: a base station determining the current maximum available Downlink Interval Usage Code (DIUC) using a downlink Carrier to Interference plus Noise ratio (CINR) fed back by a terminal, using a MIMO mode fed back by the terminal to determine the current channel condition, and jointly adjusting the current MIMO mode and the DIUC of the terminal within the maximum available DIUC range according to the current channel condition. The method and base station overcome the shortcoming of adjusting MIMO modes or DIUCs separately, and provide more combinations of the MIMO modes and DIUCs to maximize spectral utilization and data transmission rate, thereby achieving ultimately the purpose of improving link reliability and system throughput.