Content delivery network architecture with edge proxy

• US 9,838,497 B2
• Filed: 02/19/2015
• Issued: 12/05/2017
• Est. Priority Date: 02/19/2014
• Status: Active Grant

• Current Assignee: Level 3 Communications LLC (Lumen Technologies, Inc.)
• Original Assignee: Level 3 Communications LLC (Lumen Technologies, Inc.)
• Inventors: Lawrence, Joseph C., Johns, Kevin C., Power, William R.
• Primary Examiner(s): Choudhury, Azizul
• Application Number:
  US14/626,425
• Publication Number:
  US 20150237159A1
• Time in Patent Office: 1,020 Days
• Field of Search: None
• CPC Class Codes: H04L 41/0668 by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1014 based on the content of a request
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/1034 Reaction to server failures by a load balancer
• CPC Class Codes: H04L 67/563 Data redirection of data network streams
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

Aspects of the present disclosure involve systems, methods, computer program products, and the like, for a content delivery network (CDN) architecture utilizing one or more proxy cache devices between a requesting device and an edge cluster of the CDN. The proxy cache device is a relatively high speed device compared to various possible devices making up one or more edge clusters. Thus, if the proxy has cached the requested content, it is capable of directly servicing the client content request at a faster rate than providing the content from the edge cluster. Otherwise, the proxy cache may request the content from an edge cluster and store the content for quick retrieval in response to additional requests for the content. In one embodiment, the proxy cache may perform an analysis of the request or a series of requests to determine if the content is cached at the proxy cache device.

Claims

1. A content delivery network comprising:

a proxy cache device in communication with a telecommunications network, the telecommunications network configured to transmit a request for a content file from a user device connected to the telecommunications network to the proxy cache device; and

a plurality of edge servers in communication with the proxy cache device through a local network, each of the plurality of edge servers configured to obtain the content file in response to receiving the request for the content file and cache the obtained content file;

wherein the proxy cache device is further configured to calculate a hash value based at least on the request for the content file, select a first edge server from the plurality of edge servers based at least on comparison of the calculated hash value to hash values previously assigned to the first edge server, and transmit the request for the content file to the selected first edge server.

2. The content delivery network of claim 1 wherein the first edge server is further configured to provide the content file to the proxy cache device in response to the request for the content file and the proxy cache device is further configured to provide the content file to the telecommunications network.

3. The content delivery network of claim 1 wherein the proxy cache device is further configured to store the content file in a local storage.

4. The content delivery network of claim 3 wherein the proxy cache is further configured to provide the content file from the local storage to the telecommunications network in response to a second request for the content file.

5. The content delivery network of claim 1 wherein the request for the content file includes a uniform resource locator associated with the content file and the hash value is calculated based at least on the uniform resource locator.

6. The content delivery network of claim 5 wherein the calculation of the hash value is repeatable for an additional request for the content file received at the proxy cache device.

7. The content delivery network of claim 1 wherein the first edge server is in communication with a content provider network and is further configured to obtain the content file from the content provider network.

8. A method for operating a content delivery network, the method comprising:

receiving a first request for a content file at a first proxy cache device over a telecommunications network configured to transmit the first request for the content file from a user device connected to the telecommunications network;

calculating a first hash value based at least on the first request for the content file;

selecting a first edge server from a plurality of edge servers based at least on comparison of the calculated hash value to hash values previously assigned to the first edge server, the plurality of edge servers in communication with the proxy cache device through a local network and configured to obtain the content file in response to receiving the first request for the content file and cache the obtained content file; and

transmitting the first request for the content file to the selected first edge server.

9. The method of claim 8 further comprising:

receiving the content file at the first proxy cache from the selected first edge server at least in response to the transmitted request for the content file; and

providing the content file to the user device.

10. The method of claim 9 further comprising:

storing the content file in a local storage in communication with the first proxy cache device.

11. The method of claim 10 further comprising:

receiving a second request for the content file at a second proxy cache device;

calculating a second hash value based at least on the second request for the content file;

selecting the first edge server from the plurality of edge servers based at least on comparison of the calculated second hash value to hash values previously assigned to the first edge server; and

transmitting the second request for the content file to the selected edge server.

12. The method of claim 11 wherein the first request for the content file and the second request for the content file include a uniform resource locator associated with the content file and the first hash value and the second hash value are calculated based at least on the uniform resource locator.

13. The method of claim 12 wherein the first hash value and the second hash value are the same.

14. The method of claim 11 further comprising:

receiving a third request for the content file at the second proxy cache device; and

transmitting the third request for the content file to the first proxy cache device based at least on a determination of the content file being stored in the local storage in communication with the first proxy cache.

15. The method of claim 10 further comprising:

ascertaining a popularity identifier associated with the content file prior to storing the content file in a local storage in communication with the first proxy cache device.

16. The method of claim 15 wherein ascertaining the popularity identifier of the content file comprises:

comparing a count of a total number of requests for the content file received at the first proxy cache to a threshold value; and

setting the popularity identifier associated with the content file if the count of a total number of requests for the content file equals or exceeds the threshold value.

17. The method of claim 15 wherein ascertaining the popularity identifier of the content file comprises:

receiving a popularity indicator of the content file from a network configuration device; and

storing the received popularity indicator of the content file in a storage device for comparison to received content files at the first proxy cache device.

18. A method for providing a content file through a telecommunications network, the method comprising:

receiving a first request for a content file at a first proxy cache device from a first end user device of a plurality of end user devices in communication with the telecommunications network;

calculating a first hash value based at least on the first request for the content file;

selecting a first edge server from a plurality of edge servers based at least on comparison of the calculated first hash value to hash values previously assigned to the first edge server, the plurality of edge servers configured to obtain the content file in response to receiving the first request for the content file and cache the obtained content file;

transmitting the first request for the content file to the selected first edge server;

receiving a second request for the content file at a second proxy cache device from a second end user device of the plurality of end user devices in communication with the telecommunications network;

calculating a second hash value based at least on the second request for the content file;

selecting the first edge server from the plurality of edge servers based at least on comparison of the calculated second hash value to hash values previously assigned to the first edge server; and

transmitting the second request for the content file to the selected first edge server.

19. The method of claim 18 wherein the first request for the content file and the second request for the content file include a uniform resource locator associated with the content file and the first hash value and the second hash value is calculated based at least on the uniform resource locator.

20. The method of claim 19 wherein the first hash value and the second hash value are the same.