Wireless Sensor Node Power Control for TDMA Reliability
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Solution Overview
Problem
Existing wireless communication systems for sensors using the TDMA method face challenges in low power consumption and interference resistance, particularly when frequent detection information is transmitted, leading to increased power consumption and potential communication failures due to retransmission control issues during battery level notifications.
Innovation Solution
A wireless communication apparatus with a switch unit for power control, RAM for storing operating state information, and a control unit that manages power supply based on stored information, allowing for reduced power consumption by optimizing message transmission and retransmission control, and enhancing battery voltage notification efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If intermittent reception control is used to reduce power consumption, then power consumption is reduced, but communication reliability deteriorates due to retransmission failures during battery level notifications
Solution Approach 1:
The patent applies dynamics by making the reception control mode adjustable between continuous reception and intermittent reception based on communication requirements. The slave unit can dynamically switch between these modes, allowing the system to optimize between power consumption and communication reliability in different operational scenarios.
Solution Approach 2:
The patent changes the reception control parameter from fixed intermittent reception to variable reception control. By allowing the slave unit to selectively perform continuous reception when needed (such as during battery level notifications) and intermittent reception during normal operation, the system can adapt communication parameters to maintain reliability while managing power consumption.
2Reliability
If continuous reception is performed to maintain synchronization and ensure communication reliability, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action through intermittent reception control, where the slave unit performs reception at specific intervals rather than continuously. This allows the system to maintain basic synchronization and communication reliability while significantly reducing power consumption compared to continuous reception.
Solution Approach 2:
The system dynamically adjusts reception behavior based on operational needs. During normal standby operation, intermittent reception is used to minimize power consumption. When communication events occur (such as battery level notifications), the system can transition to continuous reception to ensure reliable communication, then return to intermittent mode afterward.
3Reliability
If retransmission control is implemented to ensure reliable message delivery, then communication reliability is improved, but power consumption increases due to repeated transmission attempts
Solution Approach 1:
The patent implements feedback through acknowledgment mechanisms in the communication protocol. When the master unit receives a message from the slave unit, it sends an acknowledgment. The slave unit can determine whether retransmission is needed based on receiving or not receiving this acknowledgment, allowing selective retransmission that maintains reliability while avoiding unnecessary power consumption from repeated transmissions.
Solution Approach 2:
The system applies partial retransmission control rather than always performing full retransmission sequences. By using feedback to determine when retransmission is actually needed and only performing retransmission in those cases, the system achieves sufficient message delivery reliability without the excessive power consumption that would result from always performing complete retransmission cycles.
Data Source
AI summary
A wireless communication apparatus operates in tributary to a control station that performs a time division multiplex communication. The wireless communication apparatus includes a switch unit that switches on/off a power supplied from a battery; a power supply control unit that controls the switch unit; a RAM to which a power is constantly supplied from the battery; a control unit that receives the power supplied through the switch unit. The control unit writes information for determining an operating state in the RAM when being shifted to a standby state. The power supply control unit turns off the switch unit upon receiving a signal of a power supply off. When the control unit is re-supplied with the power through the switch unit, the control unit determines an operation based on the information for determining the operating state stored in the RAM.