Video Transmission Bit Rate Control via Network Congestion Feedback
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Solution Overview
Problem
Existing video information transmission systems on QoS non-guaranteed networks, such as the Internet, face challenges in maintaining video quality due to changing bandwidth, error rates, and jitter, leading to network congestion and degradation of continuous media like video and voice information.
Innovation Solution
A video information transmission system that monitors reception status to determine network congestion and dynamically adjusts the transmission bit rate based on acquired congestion information, using RTCP to feedback congestion data and control the bit rate to prevent packet loss and maintain quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed transmission bit rate is used, then transmission simplicity is maintained, but network congestion occurs and packet loss increases when bandwidth narrows
Solution Approach 1:
The transmission bit rate is changed from fixed to dynamic, adjusting according to network conditions. The sender monitors packet loss rate and transmission delay, then adapts the bit rate accordingly to maintain reliable transmission while utilizing available bandwidth effectively.
Solution Approach 2:
A feedback mechanism is implemented where the receiver sends packet loss rate and transmission delay information back to the sender. The sender uses this feedback to adjust the transmission bit rate, creating a closed-loop control system that responds to network conditions.
2Reliability
If transmission bit rate is decreased after packet loss occurs, then packet loss is reduced, but reproduction quality degrades and delay increases
Solution Approach 1:
The system performs preliminary actions by adjusting the transmission bit rate before severe packet loss occurs. By monitoring network conditions continuously and proactively reducing the bit rate when congestion signs appear, the system prevents quality degradation rather than reacting after damage is done.
Solution Approach 2:
The system applies preliminary anti-action by reducing transmission bit rate in anticipation of network congestion. When packet loss rate or delay exceeds thresholds, the sender preemptively lowers the bit rate to prevent buffer overflow and maintain reproduction quality.
3Reliability
If network buffer is increased to reduce packet loss, then packet loss decreases, but transmission delay doubles
Solution Approach 1:
Instead of changing the buffer size parameter, the system changes the transmission bit rate parameter. By adjusting the input rate to match network capacity, the system maintains low delay while achieving reliable transmission without requiring large buffers.
4Reliability
If conventional congestion control is implemented, then packet loss is reduced, but the system requires non-standard protocols and complex switch feedback mechanisms
Solution Approach 1:
The congestion control system is self-service, requiring no modifications to network switches or infrastructure. The sender and receiver alone monitor and adjust transmission parameters based on observed packet loss and delay, eliminating the need for complex switch feedback mechanisms or non-standard protocols.
Data Source
AI summary
This invention provides a video information transmission apparatus for efficiently transmitting a digital video such as MPEG video at real time while controlling congestion on a QoS non-guaranteed IP network and suppressing degradation of a video quality. A transmission control section 13 on a sender side outputs bit rate feedback information in accordance with congestion information on the network to a real-time encoder 12, and controls a transmission bit rate to change the transmission bit rate in accordance with congestion information on the network. The bit rate feedback information is obtained based on the congestion information on the network on the sender side, or obtained on a receiver side and fed back.