Wireless Terminal Mode Selection via HARQ Feedback
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Solution Overview
Problem
In wireless communication systems, there is a need to efficiently select between full duplex and half duplex modes of operation for wireless terminals, particularly in device-to-device (D2D) communications, to optimize communication quality and manage self-interference effectively, especially in scenarios where channel conditions and geometry are dynamic.
Innovation Solution
The method involves determining the mode of operation based on Hybrid Automatic Repeat Request (HARQ) re-transmissions, using a parameter indicating the number of HARQ re-transmissions to switch between full duplex and half duplex modes, and selecting between D2D and cellular communication modes to adapt to instantaneous channel conditions and changing system geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex mode is used to enable simultaneous transmission and reception, then communication efficiency is improved, but self-interference increases
Solution Approach 1:
The system dynamically switches between full duplex and half duplex modes based on real-time channel conditions and geometry. The network node determines the optimal mode by evaluating parameters such as channel quality indicators and signal strength, allowing the system to adapt to changing conditions rather than being fixed in one mode.
Solution Approach 2:
The invention changes the operational parameters of the wireless terminal by switching between different duplex modes (full duplex/half duplex) and communication modes (D2D/cellular) based on measured channel conditions. This parameter change allows the system to optimize performance by selecting the mode with the most favorable characteristics for current conditions.
2Reliability
If mode selection is based on detailed channel measurements and geometry, then communication reliability is improved, but system complexity increases
Solution Approach 1:
The system uses feedback mechanisms where the network node receives measurements from wireless terminals about channel conditions and geometry. Based on this feedback, the network node determines the optimal mode of operation and communicates this decision back to the terminals. This feedback loop enables reliable mode selection without requiring each terminal to independently perform complex analysis.
Solution Approach 2:
The network node acts as an intermediary that centralizes the mode selection decision-making process. Instead of each terminal independently analyzing channel conditions and making decisions, the network node collects measurement data from multiple terminals and makes the mode selection decision, simplifying the complexity distribution across the system.
3Reliability
If adaptive mode switching is implemented to respond to channel changes, then communication quality is improved, but processing overhead increases
Solution Approach 1:
The system performs preliminary measurements of channel conditions and geometry before making mode selection decisions. By continuously monitoring and pre-evaluating channel parameters, the system is prepared to make quick mode switching decisions when conditions change, reducing the processing overhead required at the moment of switching.
Data Source
AI summary
A method of determining a mode of operation for a wireless terminal comprises determining a parameter indicating Hybrid Automatic Repeat Request, HARQ, re-transmissions in communications with the wireless terminal. The method further comprises determining a full duplex or half duplex mode of operation based on the parameter of HARQ re-transmissions.