Link Adaptation for Energy-Efficient Wireless Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Achieving multiplexing gains through spatial multiplexing in wireless communication systems is challenging due to increased power consumption as the number of transmission ranks and receiving antennas increases, affecting spectral efficiency and battery life.
Innovation Solution
A link adaptation method and apparatus that estimate data transmission rates and power consumption across various reception conditions, calculate energy efficiencies, and determine the optimal number of antennas to receive data signals, thereby optimizing energy usage and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transmission ranks and receiving antennas is increased to achieve multiplexing gains, then spectral efficiency is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic link adaptation that adjusts the number of receiving antennas and transmission ranks based on real-time channel conditions and energy efficiency calculations. The system dynamically selects from multiple reception conditions (different combinations of transmission ranks and antenna quantities) to optimize the balance between spectral efficiency and power consumption, rather than using a fixed configuration.
Solution Approach 2:
The patent changes key parameters including the number of receiving antennas, transmission ranks, and modulation schemes based on calculated energy efficiency metrics. By adjusting these parameters according to channel state information and power consumption estimates, the system achieves optimal spectral efficiency while controlling power usage.
2Reliability
If the number of receiving antennas is increased to improve reception performance, then data transmission reliability is improved, but battery life is reduced
Solution Approach 1:
The system dynamically adjusts the number of active receiving antennas based on real-time energy efficiency calculations. When channel conditions are good, fewer antennas are used to conserve battery life. When channel conditions deteriorate, the system activates more antennas to maintain reception performance, thus dynamically balancing reliability and battery life.
Solution Approach 2:
The patent performs preliminary estimation of power consumption and data transmission rates for multiple possible reception conditions before making the final selection. This allows the system to predict the battery life impact of different antenna configurations and choose the optimal configuration in advance, avoiding unnecessary power consumption.
3Productivity
If spatial multiplexing is applied in every channel environment to maximize multiplexing gains, then data transmission rate is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent changes the transmission parameters including the number of transmission ranks and modulation order based on channel conditions and energy efficiency calculations. In favorable channel conditions, spatial multiplexing with higher ranks is applied to maximize data rate. In poor conditions, the system reduces ranks or switches to more robust modulation schemes to maintain energy efficiency.
Solution Approach 2:
The system uses feedback from energy efficiency calculations to adjust spatial multiplexing parameters. By continuously monitoring the relationship between power consumption and data transmission rate under different reception conditions, the system provides feedback to select the optimal combination of transmission ranks and antenna quantities, ensuring energy-efficient operation across varying channel environments.
Data Source
AI summary
An operating method of a wireless communication apparatus including a plurality of antennas and receiving a data signal through a downlink channel from a base station includes: calculating a plurality of estimated energy efficiencies under a plurality of reception conditions of the wireless communication apparatus in accordance with prior information regarding a number of transmission ranks and a number of receiving antennas to be used for receiving the data signal; and generating channel state information by using the calculated estimated energy efficiencies and determining the number of receiving antennas.