Dynamic Channel Coding for Mobile Terminal Energy Saving
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Solution Overview
Problem
Current wireless communication systems fail to optimize energy efficiency, particularly in short-range communications, as they neglect internal processing power consumption and apply the same adaptive modulation and coding schemes for both uplink and downlink connections without considering channel differences, leading to excessive energy usage in mobile terminals.
Innovation Solution
A method and system that dynamically determine if channel coding is needed on the downlink connection based on specific criteria, selecting the most energy-efficient coding scheme for the user equipment, and applying different coding schemes for uplink and downlink connections to optimize energy efficiency, with the user equipment always applying channel coding on the uplink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel coding is always applied on downlink connection to ensure reliable communication, then communication reliability is improved, but energy consumption of user equipment increases due to decoding complexity
Solution Approach 1:
The patent applies dynamic coding scheme selection where the base station adapts the coding scheme on downlink connections based on real-time channel conditions and quality metrics. Instead of always applying channel coding, the system dynamically adjusts between coded and uncoded transmission modes, allowing user equipment to decode only when necessary, thus reducing energy consumption while maintaining reliability when needed
Solution Approach 2:
The patent changes the coding parameter (coding scheme) based on channel quality conditions. When channel quality is good, uncoded transmission is used to save energy; when channel quality degrades, coded transmission is activated to maintain reliability. This parameter adaptation resolves the contradiction by making coding reliability conditional rather than constant
2Device complexity
If the same adaptive modulation and coding scheme is applied to both uplink and downlink connections, then system simplicity is maintained, but energy efficiency deteriorates due to ignoring channel differences between directions
Solution Approach 1:
The patent applies different coding schemes to different communication directions (uplink and downlink) based on their specific channel characteristics. The downlink connection uses adaptive coding scheme selection based on downlink channel quality, while the uplink connection uses independent coding scheme selection based on uplink channel conditions. This local optimization for each direction improves energy efficiency without significantly increasing system complexity
Solution Approach 2:
The patent segments the communication system into independent uplink and downlink coding scheme selections. Each direction has its own coding scheme determination process based on respective channel conditions, allowing independent optimization of energy efficiency for each direction rather than applying a unified approach
3Power
If internal processing power consumption is neglected in favor of optimizing radiated transmission power, then long range communication performance is improved, but energy efficiency deteriorates for short range communications where processing power dominates
Solution Approach 1:
The patent changes the optimization parameter from solely radiated transmission power to total power consumption that includes both transmission power and internal processing power. By considering decoding complexity and processing energy in the optimization objective, the system selects coding schemes that minimize total energy consumption, which is particularly important for short-range communications where processing power dominates
Data Source
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AI summary
The present invention relates to a method and corresponding system for saving energy for user equipment in a wireless network, the method comprising based on a decision obtained by a decision function determining based on predetermined criteria if channel coding is needed on a downlink connection between a base station and user equipment and if said coding is determined to be needed, selecting an appropriate coding scheme that yield energy saving for the user equipment.