Wireless Receiver Intra-Frame Shutdown for Power Management
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Solution Overview
Problem
Wireless communication terminals face challenges in minimizing power consumption and maximizing battery life due to the need to continuously listen for downlink signals, especially in WiMAX systems where efficient power management is not adequately addressed by existing sleep mechanisms.
Innovation Solution
The terminal employs an intra-frame shutdown method, where components like the radio receiver are shut down during intervals outside allocated time allocations within a downlink frame, using a digital processing circuit to identify time allocations and adjust shutdown margins based on channel coherence and SNR, in addition to full-frame shutdown techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously listens for downlink signals to ensure data reception, then data reception reliability is improved, but power consumption increases
Solution Approach 1:
The downlink frame is segmented into multiple zones (map zone, data zone, etc.), and the RF receiver is selectively activated only during specific zones where downlink data is expected. This segmentation allows the terminal to divide the reception duty into essential and non-essential periods, reducing overall power consumption while maintaining data reception reliability during active zones.
Solution Approach 2:
The terminal employs periodic activation of the RF receiver synchronized with the downlink frame structure, activating only during map zone and data zone periods. This periodic action pattern allows the receiver to be off during intervals without data transmission, significantly reducing power consumption while ensuring data is captured during active transmission windows.
2Use of energy by moving object
If the terminal shuts down RF receiver during intervals outside time allocation to reduce power consumption, then power consumption is reduced, but data reception performance may deteriorate
Solution Approach 1:
The terminal activates the RF receiver in advance during the map zone before the actual data transmission begins in the data zone. This preliminary action allows the terminal to prepare for incoming data, ensure the receiver is ready, and maintain optimal reception performance when data arrives, while still achieving power savings during intervals when no data is transmitted.
Solution Approach 2:
The terminal uses feedback from the map zone information to determine precise activation and shutdown timing of the RF receiver. The map zone provides advance information about data allocation, allowing the terminal to adjust its receiver operation dynamically based on actual data transmission requirements, ensuring optimal performance while minimizing power consumption.
Data Source
AI summary
A terminal for use in a wireless network includes a radio frequency (RF) receiver, which is configured to receive and downconvert a RF signal. The RF signal includes a sequence of downlink frames, each downlink frame including at least a map zone followed by a data zone. The map zone contains an indication of a time allocation in the data zone during which downlink data will be transmitted to the terminal. An analog/digital (A/D) converter converts the output signal from the RF receiver into a stream of digital samples. A digital processing circuit processes the digital samples so as to identify the time allocation and to recover the downlink data transmitted during the identified time allocation, while shutting down the RF receiver during at least one interval during the downlink frame that is outside the identified time allocation.