MIMO Mode Switching via Staying Time Thresholds
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Solution Overview
Problem
Existing wireless communication systems face frequent switching of MIMO modes in mobile stations due to inadequate consideration of frequency efficiency, leading to reduced communication efficiency and frequent mode changes.
Innovation Solution
An apparatus and method for switching MIMO modes that determine the current mode and calculate staying times in both SD and SM modes, switching to the second mode when the first mode's staying time exceeds a threshold, and vice versa based on CINR and MCS levels, to prevent frequent mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the MIMO mode is switched from SD mode to SM mode when CINR value is greater than or equal to a threshold, then the transmission rate increases through spatial multiplexing, but the mobile station cannot normally decode received data due to low decoding capability, causing the MCS level to decrease and forcing a switch back to SD mode
Solution Approach 1:
The patent implements a feedback mechanism where the base station monitors the MCS level of the mobile station. When the MCS level falls below a threshold after switching to SM mode, the system automatically switches back to SD mode. This feedback loop ensures that transmission reliability is maintained by adapting the MIMO mode based on the mobile station's actual decoding capability, preventing persistent transmission of undecodable data.
Solution Approach 2:
The patent introduces dynamic adaptation of MIMO modes based on real-time channel conditions and mobile station capability. The system transitions from static mode selection to dynamic switching between SD and SM modes, adjusting the transmission strategy according to the mobile station's decoding performance and MCS level, thereby optimizing both transmission rate and reliability adaptively.
2Ease of operation
If the MIMO mode switching is based solely on CINR value threshold comparison, then the mode switching decision is simple and fast, but the MIMO mode switches frequently in mobile stations with low decoding capability, reducing communication efficiency
Solution Approach 1:
The patent adds MCS level monitoring as a feedback parameter to the mode switching decision process. The base station not only considers CINR values but also tracks the MCS level and mobile station decoding capability. This enhanced feedback mechanism prevents frequent switching by ensuring that SM mode is only maintained when the mobile station can successfully decode the transmitted data, thereby improving communication efficiency while keeping the switching logic relatively simple.
Solution Approach 2:
The patent changes the decision parameters from solely CINR-based to a composite criterion including CINR value, MCS level, and decoding capability. This multi-parameter approach filters out inappropriate mode switches, reducing frequency of unnecessary transitions while maintaining the simplicity of threshold-based comparison for each parameter.
3Adaptability or versatility
If the MIMO mode is switched frequently between SD and SM modes, then the system adapts to changing channel conditions, but the communication efficiency is reduced due to repeated mode transitions and instability
Solution Approach 1:
The patent employs feedback mechanisms that monitor both CINR values and MCS levels over time before triggering mode switches. By requiring sustained conditions (not just transient fluctuations) to trigger switching, the system reduces unnecessary transitions while maintaining adaptability to genuine changes in channel conditions. This feedback-based filtering stabilizes the system and improves communication efficiency.
Solution Approach 2:
The patent implements a cushioning mechanism by setting threshold margins and monitoring multiple parameters before initiating mode switches. This prevents premature or unnecessary switching by ensuring that switching conditions are clearly met and sustained, thereby reducing the frequency of mode transitions and improving communication efficiency while preserving necessary adaptability.
Data Source
AI summary
Disclosed is an apparatus for switching MIMO modes, which can efficiently switch an MIMO mode of a mobile station. The apparatus for switching MIMO modes includes an MIMO mode determining unit, a staying time determining unit, and an MIMO mode switching unit. The MIMO mode determining unit determines a current MIMO mode of a mobile station. The staying time determining unit determines a first staying time in a first MIMO mode of the mobile station when the MIMO mode determining unit determines the current MIMO mode of the mobile station as the first MIMO mode for transmitting the same data through a plurality of antennas, and determines a second staying time in a second MIMO mode of the mobile station when the MIMO mode determining unit determines the current MIMO mode of the mobile station as the second MIMO mode for transmitting different data by antenna. The MIMO mode switching unit switches the MIMO mode of the mobile station to the second MIMO mode when the first staying time is greater than or equal to a first threshold staying time.