Portable Terminal Sleep Mode via Data Buffering
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Solution Overview
Problem
Portable terminals that transmit digital broadcast data through ad hoc networks face high power consumption due to continuous operation without the ability to enter a sleep mode, as they must continuously receive and retransmit data without periods to stop the receiver.
Innovation Solution
Implementing a control unit that buffers received data for a predefined time and then transmits it while maintaining a sleep state, reducing power consumption by increasing the sleep period and minimizing periodic wake-up operations for monitoring Announcement Traffic Indication Message (ATIM) frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously receives and retransmits digital broadcast data through ad hoc network, then data transmission reliability is improved, but power consumption increases due to inability to enter sleep mode
Solution Approach 1:
The terminal performs preliminary actions by receiving and buffering digital broadcast data before the scheduled transmission time (TBTT). By pre-buffering the data during wake periods, the terminal can enter sleep mode earlier and wake up only at TBTT to transmit the already-buffered data, eliminating the need for continuous reception and reducing power consumption while maintaining transmission reliability.
Solution Approach 2:
The terminal adopts periodic wake-up behavior at Target Beacon Transmission Times (TBTT) to transmit buffered data, instead of continuous operation. This periodic action pattern allows the terminal to alternate between active transmission periods and sleep periods, significantly reducing power consumption while ensuring data is transmitted at regular intervals to maintain network reliability.
2Use of energy by moving object
If the terminal enters sleep mode to reduce power consumption, then power usage is reduced, but data transmission delay increases
Solution Approach 1:
The terminal performs preliminary data reception and buffering before entering sleep mode. By preparing the data in advance during wake periods and buffering it in memory, the terminal eliminates transmission delays that would occur if data had to be received in real-time during sleep mode, thus reducing power consumption without sacrificing transmission timeliness.
3Stability of the object's composition
If the terminal continuously monitors the physical channel for beacon transmission, then network synchronization is maintained, but power consumption increases due to frequent wake-up operations
Solution Approach 1:
The terminal transitions from continuous channel monitoring to periodic monitoring at TBTT intervals. By waking up only at scheduled beacon transmission times to monitor the physical channel and transmit buffered data, the terminal maintains network synchronization through periodic presence while dramatically reducing the frequency of wake-up operations and associated power consumption.
Data Source
AI summary
An apparatus and a method for reducing power consumption in a portable terminal that transmits digital broadcast data through an ad hoc network are provided. If a terminal receiving digital broadcast transmits the received digital broadcast to a neighboring terminal, a control unit enters a sleep mode after buffering received data for a predefined time.