Camera Node Bandwidth Estimation for Security Monitoring
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Solution Overview
Problem
Existing security monitoring systems face challenges in efficiently transmitting high-quality video data from camera nodes to a central monitoring station while minimizing power consumption, leading to battery drain and potential delays in incident response.
Innovation Solution
A camera node with a node controller that transmits captured images using a node radio frequency transceiver, determining resolution and compression based on a predetermined maximum transmission duration and estimated uplink bandwidth to ensure timely delivery within the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If video data is transmitted at high speed using Wi-Fi radio, then timely incident response is enabled, but battery life is significantly reduced
Solution Approach 1:
The system dynamically adjusts transmission parameters including resolution, frame rate, and compression level based on real-time conditions such as incident severity, available bandwidth, and battery status. This allows the camera node to transmit high-quality video when needed while conserving energy during normal operation.
Solution Approach 2:
The patent changes multiple parameters simultaneously - transmission resolution, frame rate, compression algorithm, and protocol overhead - to optimize the balance between transmission speed and power consumption. Different parameter sets are selected based on incident priority and network conditions.
2Manufacturing precision
If high resolution images are transmitted, then image quality is improved, but transmission time increases causing delays in incident response
Solution Approach 1:
The system transmits a partial set of image data initially - such as a lower resolution preview or a cropped region of interest - to enable rapid incident assessment. Full high-resolution images are transmitted subsequently if needed, balancing speed and quality.
Solution Approach 2:
Image data is segmented into priority layers, with critical regions (such as detected motion areas or faces) transmitted at higher resolution and priority, while less important areas are transmitted at lower resolution or deferred.
3Loss of information
If transmission duration is extended to ensure complete data delivery, then data completeness is improved, but battery power is depleted faster
Solution Approach 1:
The system implements feedback mechanisms where the central unit acknowledges receipt of data packets and requests retransmission only of missing or corrupted data. This avoids unnecessary retransmission of already received data, reducing overall power consumption while ensuring data completeness.
Solution Approach 2:
Data is pre-processed and compressed before transmission to minimize the total data volume that needs to be transmitted. Error correction codes are also added in advance to prevent transmission errors that would require power-consuming retransmissions.
Data Source
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AI summary
A security monitoring system for a building or a secured space within a building, the system being operatively connected to a monitoring station, the system including: a control unit for controlling, arming and disarming the security monitoring system, and having a radio frequency transceiver, and a controller for controlling the radio frequency transceiver; a camera node having: a node controller; an image sensor for capturing images; a node radio frequency transceiver, for communication with the control unit; the node controller being configured to: transmit a captured image as an image file using the node radio frequency transceiver, wherein the transmission of the image file to the control unit is subject to a predetermined maximum transmission duration; and wherein the node controller is further configured to determine the resolution and compression of the image file based on the predetermined maximum transmission duration and an estimate up of the uplink bandwidth between the camera node and the control unit in order to enable the image file to be transmitted to the control unit within the predetermined maximum transmission duration; the control unit being configured: to perform measurement of RSSI and to transmit a measured RSSI value to the camera node; in response to receiving an event notification from a node of the system, to transmit, using the radio frequency transceiver, a control message to the camera node for the camera node to transmit a captured image; the control unit being further configured, on reception of a captured image file from the camera node, to transmit the received image file to the monitoring station.