Systems and methods for adjusting a congestion window value of a content delivery network
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 a 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.
1. A method for servicing requests for content in a content delivery network (CDN), the method comprising:
setting, by a content server, an initial congestion window (CWND) value for a communication session between a client device and the content server for providing information to the client device;
receiving, by the content server from the client device, a request for the content, the request comprising an identification of the content;
determining, by the content server, a content type based on the identification of the content from a database of content information, in response to the request for the content, the content type comprising an indication of a file size of the requested content and an estimated urgency of receiving the requested content for the client device; and
resetting, by the content server, the initial CWND value for the communication session between the client device and the content server based at least on the file size and the estimated urgency.
2. The method of claim 1 , further comprising:
detecting, by the content server, a congestion on a connection between the client device and the content server; and
adjusting, by the content server, the initial CWND value based on the detected congestion on the connection.
3. The method of claim 1 , wherein the identification of the content comprises a content file name included in the request for the content, and wherein resetting the initial CWND value for the communication session between the client device and the content server is further based on the content file name.
4. The method of claim 3 , further comprising determining a content type associated with the requested content based at least on the content file name, wherein resetting the initial CWND value for the communication session between the client device and the content server is further based on the content type.
5. The method of claim 1 , wherein the identification of the content comprises a requested bit rate for receiving the content from the content server at the client device.
6. The method of claim 1 , further comprising:
receiving, by the content server, a request for CWND statistics from the client device comprising one or more calculated CWND values set by the content server during the communication session; and
transmitting, by the content server, the CWND statistics to the client device.
7. The method of claim 6 , wherein the CWND statistics comprise at least one of a maximum CWND value, a minimum CWND value, an average CWND value, or a last of a CWND value.
8. A content delivery network (CDN) networking device comprising:
at least one communication port for receiving a request for content from a client device, the request comprising an identification of the content;
a processing device; and
a computer-readable medium connected to the processing device configured to store information and instructions that, when executed by the processing device, performs operations to:
set an initial congestion window (CWND) value for a communication session with the client device, the communication session to provide information to the client device;
access a database of content information to determine a content type of the requested content based at least on the identification of the requested content received from the client device, in response to the request for the content, the content type comprising an indication of a file size of the requested content and an estimated urgency of receiving the requested content for the client device;
reset the initial CWND value for the communication session with the client device based at least on the file size and the estimated urgency of the requested content; and
provide a portion of the requested content to the client device over the at least one communication port based at least on the reset initial CWND value.
9. The CDN device of claim 8 , wherein the processing device further performs operations to:
detect a congestion on a connection associated with the communication session; and
adjust the initial CWND value based on the detected congestion on the connection.
10. The CDN device of claim 8 , wherein the identification of the content comprises a content file name included in the request for the content, and wherein resetting the initial CWND value for the communication session with the client device is further based on the content file name.
11. The CDN device of claim 10 , wherein the processing device further performs operations of determining a content type associated with the requested content based at least on the content file name, wherein resetting the initial CWND value for the communication session with the client device is further based on the content type.
12. The CDN device of claim 11 , wherein the processing device further performs operations to:
estimate a latency of providing the portion of the requested content to the client device, and
reset the initial CWND value according to the estimated latency and the content type to provide the portion of the requested content to the client device.
13. The CDN device of claim 8 , wherein the identification of the content comprises a requested bit rate for receiving the content at the client device.
14. The CDN device of claim 8 , wherein the processing device further performs operations to:
receive a request for CWND statistics from the client device comprising one or more calculated CWND values; and
transmit the CWND statistics to the client device.
15. The CDN device of claim 14 , wherein the CWND statistics comprise at least one of a maximum CWND value, a minimum CWND value, an average CWND value, or a last of a CWND value.