Adaptive Duplex Mode Switching in Wireless Networks
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE networks, lack dynamic switching capabilities between full-duplex and half-duplex FDD modes, leading to inefficient spectral resource usage and increased power consumption due to static operation modes.
Innovation Solution
A method and apparatus for adaptive duplex operation in wireless networks that dynamically switch between full-duplex and half-duplex modes based on detected trigger events, such as changes in timing advance values or quality of service requirements, allowing for optimized duplex mode selection to improve spectral efficiency and battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex FDD mode is used, then simultaneous uplink and downlink transmissions are enabled, but spectral resources are wasted during low data rate periods and power consumption increases due to duplex filter requirements
Solution Approach 1:
The patent implements dynamic switching between full-duplex and half-duplex FDD modes based on real-time network conditions, traffic load, and timing advance values. This allows the system to adapt its operational mode dynamically, enabling simultaneous uplink and downlink transmissions when needed (full-duplex) while switching to time-division mode during low data rate periods (half-duplex) to save power and reduce spectral resource waste.
2Productivity
If full-duplex FDD mode is used, then simultaneous uplink and downlink transmissions are enabled, but bandwidth allocation becomes fixed and spectral efficiency decreases
Solution Approach 1:
The system dynamically adjusts bandwidth allocation and operational mode based on traffic conditions. By monitoring timing advance values and data rate requirements, the system can switch between full-duplex mode (with fixed bandwidth allocation) and half-duplex mode (with flexible time-division multiplexing), thereby adapting bandwidth usage to actual network demands and improving spectral efficiency.
3Loss of energy
If half-duplex FDD mode is used, then power consumption is reduced by replacing duplex filter with switch, but spectral efficiency decreases due to incomplete frequency band usage
Solution Approach 1:
The patent implements dynamic mode switching that allows the system to operate in half-duplex FDD mode during periods when power consumption is a concern, utilizing the simplified switch-based architecture. However, when spectral efficiency becomes a priority and traffic conditions permit, the system dynamically transitions to full-duplex FDD mode, thereby utilizing both frequency bands simultaneously and maximizing spectral resource usage.
4Device complexity
If static operation mode is used, then system complexity is reduced, but spectral resource usage efficiency and power consumption optimization are compromised
Solution Approach 1:
The system employs feedback mechanisms by continuously monitoring timing advance values, data rate requirements, and network conditions. Based on this feedback, the system dynamically determines the optimal operational mode (full-duplex or half-duplex FDD) and switches accordingly. This feedback-driven approach enables the system to optimize spectral efficiency and power consumption without requiring overly complex manual configuration or control mechanisms.
Data Source
AI summary
Methods and apparatus that enable a wireless network system to dynamically change between full-duplex FDD operation and half-duplex FDD operation in order to take advantage of operational aspects of both modes. In one embodiment, an alternative duplex mode of operation is disclosed (semi-static half duplex FDD operation) that enables coordination between the client device (e.g., UMTS UE) and the base station in order to centralize control of radio resource control (RRC) to the base station. The disclosed methods and apparatus may also advantageously incorporate hybrid ARQ (HARQ) or comparable timing requirements into their operation.