CDN Initial CWND Tuning by Content Type for Congestion Control
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Solution Overview
Problem
Existing content delivery networks (CDNs) face challenges in efficiently setting and adjusting the congestion window (CWND) value for communication sessions between client devices and content servers, leading to potential congestion, slow data transfer rates, and suboptimal user experiences.
Innovation Solution
The proposed solution involves setting an initial CWND value based on the type of content requested, rather than using a default value. This is achieved by analyzing the content type from a database and adjusting the CWND value accordingly to optimize data transfer rates and minimize congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a default initial CWND value is used for all content types, then the system is simple to operate, but the data transfer efficiency is suboptimal and congestion may occur
Solution Approach 1:
The patent applies local quality by setting different initial CWND values based on content type characteristics. Instead of using a uniform default value, the system analyzes the specific content type (video, audio, image, text, etc.) and assigns appropriate CWND values tailored to each content category, optimizing transfer efficiency for each local context
Solution Approach 2:
The patent implements preliminary action by pre-defining CWND values for different content types in a database before actual content transfer occurs. When a content request is received, the system quickly retrieves the pre-configured CWND value based on content type classification, avoiding real-time complex calculations and enabling immediate optimized transmission
2Speed
If a high initial CWND value is set, then data transfer rate is improved, but network congestion and packet loss may occur
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the initial CWND value based on content type characteristics. Different content types receive different CWND parameters - for example, video content may receive higher initial values while being more sensitive to congestion, whereas text content may receive lower values. This parameter optimization balances transfer speed with network stability for each content category
3Reliability
If a low initial CWND value is set, then network congestion is avoided, but data transfer rate and user experience deteriorate
Solution Approach 1:
The patent resolves this contradiction by changing the CWND parameter based on content type analysis. Instead of using a conservatively low default value for all content, the system identifies content types that can tolerate higher initial rates (such as video streaming) and assigns appropriately higher CWND values, thereby improving delivery efficiency while maintaining network stability through content-aware parameter selection
4Productivity
If content-specific CWND analysis is implemented, then transfer efficiency is optimized, but system complexity and processing overhead increase
Solution Approach 1:
The patent reduces system complexity through preliminary action by pre-configuring CWND values for different content types in a database during system setup. At runtime, the system simply classifies the content type and retrieves the corresponding pre-determined CWND value, avoiding complex real-time analysis and keeping the operational system architecture simple while still achieving optimized performance
Data Source
AI summary
Aspects of the present disclosure involve systems, methods, computer program products, and the like, for controlling a congestion window (CWND) value of a communication session of a CDN. In particular, a content server may analyze a request to determine or receive an indication of the type of content being requested. The content server may then set the initial CWND based on the type of content being requested. For example, the content server may set a relatively high CWND value for requested content that is not particularly large, such as image files or text, so that the data of the content is received at the client device quickly. For larger files or files that have a determined smaller urgency, the initial CWND may be set at a lower value to ensure that providing the data of the content does not congest the link between the devices.