Dynamic Bandwidth Allocation for Wireless Video Surveillance
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Solution Overview
Problem
Current video surveillance systems using IEEE 802.11e standard for wireless video streaming face challenges in maintaining video quality due to variable wireless channel conditions, leading to decreased bandwidth resources and pixilated video, especially in outdoor deployments.
Innovation Solution
A method that dynamically adjusts bandwidth allocation by monitoring signal strength and packet loss in wireless video surveillance systems, allowing wireless encoders and bridges to request changes in bit transmission rates based on predefined thresholds, and prioritizing I-frames over P-frames to ensure robust video delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If IEEE 802.11e standard mechanisms are used to allocate guaranteed bandwidth, then bandwidth allocation is improved, but wireless channel resources decrease due to not accounting for variable wireless channel conditions
Solution Approach 1:
The patent implements dynamic bandwidth allocation that adapts to changing wireless channel conditions. The system continuously monitors signal strength and packet loss metrics, then adjusts the allocated bandwidth in real-time based on current channel quality, transforming the static 802.11e bandwidth allocation into a dynamic system that responds to environmental changes.
Solution Approach 2:
The patent introduces a feedback mechanism where the system monitors wireless channel conditions (signal strength, packet loss) and uses this information to adjust bandwidth allocation. The monitoring module continuously provides feedback about channel quality, which triggers bandwidth reallocation when thresholds are exceeded, creating a closed-loop control system.
2Device complexity
If fixed bandwidth allocation is used, then implementation simplicity is improved, but video quality deteriorates under variable wireless channel conditions
Solution Approach 1:
The patent implements a self-adjusting system where the bandwidth allocation mechanism automatically responds to channel conditions without manual intervention. The monitoring module detects when video quality is at risk based on signal strength and packet loss thresholds, and the system self-corrects by adjusting bandwidth allocation to maintain acceptable video quality.
3Manufacturing precision
If bandwidth is increased to maintain video quality, then video performance is improved, but wireless channel resources are consumed more rapidly
Solution Approach 1:
The patent changes the bandwidth allocation parameter dynamically based on wireless channel conditions. When channel quality is good, the system uses lower bandwidth; when conditions deteriorate (signal strength drops or packet loss increases), the system increases bandwidth allocation to maintain video quality, optimizing resource usage across varying conditions.
Data Source
AI summary
A method of improving video performance in video surveillance system having a wireless encoder connected to a video surveillance network by a wireless access point device comprises the steps of allocating channel bandwidth to the wireless encoder from the wireless access point device, transmitting packets of video data from the wireless encoder to the wireless access point device, transmitting signals from the wireless access point device to the wireless encoder, monitoring the strength of the signals received by the wireless access point device, the strength of the signals received by the wireless encoder, and the number of lost packets of video data transmitted from the wireless encoder to the wireless access point device, sending a request from the wireless encoder to the wireless access point device to change the bit transmission rate of the wireless encoder if the strength of the signals received by the wireless access point device is less than a first threshold, if the strength of the signals received by the wireless encoder is less than a second threshold, or if the number of lost packets of video data is greater than a third threshold, and changing the bit transfer rate of the wireless encoder if the wireless access point device approves the change.