Wireless Security Device Latency-Based Sleep Control
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Solution Overview
Problem
Communication between connected security sensors and remote monitoring servers can rapidly drain battery life due to continuous data transmission and lack of efficient power-saving mechanisms.
Innovation Solution
A wireless security device that estimates link latency and uses a polling mode to manage sleep states, allowing it to wake up only when necessary to receive messages, thereby reducing unnecessary power consumption and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous data transmission is used to maintain communication with the security server, then the device remains responsive and reliable, but battery life is rapidly drained
Solution Approach 1:
The device implements periodic wake-up cycles where it alternates between sleep mode and active communication mode. During each cycle, the device wakes up at predetermined intervals to transmit status information and receive commands, then returns to sleep mode. This periodic action maintains communication reliability while significantly reducing average power consumption compared to continuous transmission.
Solution Approach 2:
The device estimates link latency in advance and uses this information to optimize its wake-up timing and message buffering strategy. By knowing the expected round-trip time for communications, the device can schedule wake-ups more efficiently and determine appropriate buffer durations, ensuring reliable communication without unnecessary wake-ups that would waste battery power.
2Use of energy by moving object
If the device enters sleep state to conserve battery, then energy consumption is reduced, but messages may be lost if not properly buffered
Solution Approach 1:
The access point serves as an intermediary message buffer between the security server and the wireless security device. When the device enters sleep state, the access point retains incoming messages directed to the device for a threshold period. This intermediary buffering ensures no messages are lost during sleep periods, while the device can conserve battery by waking only when necessary to retrieve buffered messages or transmit status updates.
Solution Approach 2:
The system implements a message buffer with a threshold period duration that cushions against potential message loss during device sleep states. By preparing this buffer in advance and maintaining it for the threshold period, the system ensures that even if the device wakes later than expected, messages will not be lost, thus protecting against information loss while allowing extended sleep periods for battery conservation.
3Speed
If the device wakes up frequently to check for messages, then communication responsiveness is improved, but battery life is reduced
Solution Approach 1:
The device uses estimated link latency to self-determine optimal wake-up intervals and message buffer durations without requiring frequent server pings or manual configuration. By autonomously calculating appropriate timing based on measured network conditions, the device maintains responsive communication while minimizing wake-up frequency to conserve battery power.
Solution Approach 2:
The device dynamically adjusts communication parameters including wake-up interval and message buffer threshold period based on estimated link latency. When latency is high, the device increases wake-up intervals and buffer durations; when latency is low, it can wake more frequently with shorter buffers. This parameter adaptation optimizes the balance between communication responsiveness and power consumption under varying network conditions.
Data Source
AI summary
A method of communicating between a wireless security device and a security server through an access point includes estimating a link latency between a time of transmission of a message from the wireless security device and a time at which a response is received from the security server. A polling mode is enabled in which the access point will hold messages received by the access point that are directed to the wireless security device while the device is in a sleep state, without discarding the messages for a threshold period of time. The wireless security device may be placed in a sleep state and woken after a wake time determined based on the estimated link latency, and receives any messages received by the access point during the sleep state.