MCS Level Selection Using Terminal Velocity and Channel Feedback
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Solution Overview
Problem
Existing broadband wireless mobile communication systems face inefficiencies in Modulation and Coding Selection (MCS) due to mismatch between MCS level changes and actual wireless environment conditions, leading to reduced frequency band efficiency and degraded data transmission performance, especially when terminals move or experience significant channel fluctuations.
Innovation Solution
A method and apparatus for selecting an MCS level based on the terminal's location, moving direction, and velocity, as well as Round Trip Time (RTT) values, to adaptively adjust the MCS level range according to channel conditions, ensuring optimal data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a wide variable range of MPR is set to quickly respond to significant channel fluctuations, then the response speed to channel environment changes is improved, but frequency band use efficiency is reduced in stable channel environments
Solution Approach 1:
The patent applies dynamics by making the MPR adjustment range variable rather than fixed. The base station dynamically determines the MPR adjustment range based on real-time channel conditions, using a wider range when channel fluctuations are significant and a narrower range when the channel is stable. This dynamic adaptation allows the system to quickly respond to channel changes while maintaining frequency band efficiency in stable environments.
Solution Approach 2:
The patent changes the parameter of MPR adjustment range from a fixed value to a variable value that depends on channel conditions. By monitoring channel fluctuations and adjusting the MPR range accordingly, the system optimizes both response speed and frequency band efficiency. The parameter change enables the system to adapt to different operational scenarios without compromising either performance aspect.
2Loss of energy
If a narrow variable range of MPR is set to maintain frequency band efficiency in stable channels, then frequency band use efficiency is improved, but the ability to quickly respond to terminal movement or significant channel fluctuations is reduced
Solution Approach 1:
The system dynamically adjusts the MPR adjustment range based on detected channel conditions. When the channel is stable, a narrow range is used to maintain frequency band efficiency. When channel fluctuations are detected (indicating terminal movement or changing environment), the system automatically expands the adjustment range to enable quick response. This dynamic behavior resolves the contradiction by adapting the parameter to current operational needs.
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors channel conditions and adjusts the MPR range accordingly. The feedback from channel quality indicators and HARQ information enables the system to detect when a wider MPR range is needed for quick response versus when a narrower range maintains efficiency. This feedback loop ensures optimal performance in both stable and changing environments.
3Ease of operation
If MCS level is changed based on regular time intervals regardless of actual channel conditions, then scheduling simplicity is maintained, but frequency band efficiency is reduced when MCS changes do not match actual wireless environment
Solution Approach 1:
The patent uses feedback information including CQI, HARQ ACK/NACK, and channel quality measurements to dynamically adjust MCS levels. Instead of relying solely on fixed time intervals, the system responds to actual channel conditions through feedback loops. This feedback mechanism maintains scheduling simplicity while significantly improving frequency band efficiency by ensuring MCS changes reflect real-time wireless environment changes.
Solution Approach 2:
The system changes the parameter of MCS selection from a time-based fixed interval approach to a condition-based dynamic approach. The MCS level is adjusted based on real-time channel conditions, terminal location, and moving velocity rather than predetermined time schedules. This parameter change enables the system to maintain operational simplicity while adapting to actual environmental conditions, thereby improving frequency band efficiency.
Data Source
AI summary
A method and apparatus for selecting a Modulation and Coding Selection (MCS) level by a base station in a wireless mobile communication system is provided. The method includes receiving channel condition information from a terminal; estimating a channel condition of the terminal based on the channel condition information; determining a location of the terminal based on the estimated channel condition of the terminal; measuring intensities of signals that are periodically received from the terminal; determining a moving direction and a moving velocity of the terminal based on the measured intensities; and selecting an MCS level that is to be allocated to the terminal based on the location, the moving direction, and the moving velocity of the terminal.