Bit Rate Control Device for Video Distribution Networks
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Solution Overview
Problem
In video distribution services, the bit rate of video data dynamically selected by client terminals can be unstable, particularly during network congestion, leading to fluctuations in viewing quality.
Innovation Solution
A control device that manages bit rates by storing distribution, band allocation, and system information in a database, allowing it to calculate available network bandwidth and determine the maximum selectable bit rate for client terminals based on viewing requests, thereby stabilizing bit rate selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bit rate is dynamically changed by autonomous operation of the client terminal, then the viewing quality can be optimized according to network conditions, but the bit rate becomes unstable during network congestion
Solution Approach 1:
A control device is introduced as an intermediary between the distribution system and client terminals. This mediator receives viewing requests, calculates available band in the distribution system, and determines the maximum selectable bit rate, thereby stabilizing bit rate selection while maintaining adaptability to network conditions
Solution Approach 2:
The control device continuously monitors the distribution system's band usage and available capacity, using this feedback information to dynamically adjust the maximum selectable bit rate for each viewing request, ensuring stable operation during congestion while adapting to changing conditions
2Reliability
If the client terminal autonomously selects high bit rates, then the viewing quality can be maximized, but network congestion occurs
Solution Approach 1:
The control device performs preliminary calculation of the available band in the distribution system before the client terminal selects a bit rate. By determining the maximum selectable bit rate in advance based on current system load, the device prevents client terminals from requesting bit rates that would cause or worsen network congestion
Solution Approach 2:
The control device acts as a mediator that filters and regulates bit rate requests from client terminals, preventing excessive bit rate selections that would lead to network congestion while still allowing optimal quality within available capacity
Data Source
AI summary
A control device that controls a bit rate selectable by a client terminal in a video distribution network in which video data is distributed includes a database configured to store distribution information, band allocation information, and distribution system information, the distribution information containing information on video data in a distribution system, the band allocation information containing an allocated band of each session in which the distribution system performs video distribution, and the distribution system information containing a channel band of the distribution system, and a control unit configured to receive a viewing request from the client terminal, calculate an available band in the distribution system with reference to the database, and determine a maximum bit rate selectable by the client terminal based on the available band and one or more bit rates of video data corresponding to the viewing request.