Wireless Intrusion Detector Supervision Scheduling for Faster Tamper Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Security sensors in wireless security systems are susceptible to tampering, leading to undetected alarm conditions due to infrequent check-ins, which can result in delayed detection of tampering and increased false alarms.
Innovation Solution
Implementing staggered supervisory signal schedules for wireless security sensors with offset transmission times to ensure timely detection of tampering and confirmation of alarm conditions, using a combination of different supervisory rates based on risk assessment and AI predictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If security sensors check in infrequently to reduce false alarms, then false alarms are reduced, but tampering detection is delayed
Solution Approach 1:
The patent divides the monitoring system into multiple sensors with different check-in frequencies. Critical sensors perform frequent check-ins while non-critical sensors perform infrequent check-ins, allowing the system to maintain low false alarm rates while detecting tampering quickly when needed.
Solution Approach 2:
The patent implements dynamic check-in scheduling where sensors can adjust their monitoring frequency based on system state. When an alarm condition is detected, the system transitions to a high-alert state that increases check-in frequencies for all sensors, enabling rapid tampering detection without normal frequent checking causing false alarms during peaceful periods.
2Device complexity
If multiple sensors use the same check-in schedule, then system simplicity is maintained, but sensor tampering cannot be detected individually
Solution Approach 1:
The patent segments the check-in schedule into multiple time slots distributed across a monitoring period. Each sensor is assigned a specific time slot, creating individualized schedules that enable independent tampering detection while maintaining an otherwise simple periodic checking system.
Solution Approach 2:
The patent introduces asymmetric scheduling where sensors have different check-in times within the same periodic cycle. This asymmetric distribution ensures that if one sensor is tampered with, the system can detect the absence of its supervisory signal at its specific time slot without affecting other sensors' schedules.
3Loss of time
If sensors perform frequent check-ins, then tampering detection is rapid, but energy consumption increases
Solution Approach 1:
The patent applies different check-in frequencies to different sensors based on their criticality and location. Critical sensors in high-risk areas perform frequent check-ins while non-critical sensors perform infrequent check-ins, optimizing the balance between detection speed and energy consumption for each specific sensor.
Solution Approach 2:
The patent implements dynamic frequency adjustment where sensors transition between low-power infrequent checking during normal operation and high-power frequent checking when triggered by alarm conditions or suspected tampering, thereby reducing overall energy consumption while maintaining rapid detection capability when needed.
Data Source
AI summary
A first sensor periodically communicates at a first supervisory rate and a second sensor periodically communicates at a second supervisory rate. A first tamper alarm associated with the first sensor is issued when the first supervisory signals are not received from the first sensor at the first supervisory rate. A second tamper alarm associated with the second wireless security sensor is issued when the second supervisory signals are not received from the second sensor at the second supervisory rate. The first supervisory signals and the second supervisory signals are scheduled in a manner that helps detect tampering with one or more of the first and/or second security sensors in an expedited manner.