METHODS, APPARATUS AND COMPUTER READABLE MEDIUM FOR MANAGED ADAPTIVE BIT RATE FOR BANDWIDTH RECLAMATION

• US 20100299552A1
• Filed: 05/18/2010
• Published: 11/25/2010
• Est. Priority Date: 05/19/2009
• Status: Active Grant

• Current Assignee: Synamedia Limited
• Original Assignee: BNI Video (Cisco Systems, Inc.)
• Inventors: Dewar, Donald Adrian JR., Schlack, John, Clemson, Richard Conrad
• Granted Patent: US 9,191,322 B2
• Time in Patent Office: Days
• US Class Current: 714/4.1
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/11 Identifying congestion
• CPC Class Codes: H04L 47/122 by diverting traffic away from congested entities
• CPC Class Codes: H04L 47/18 End to end
• CPC Class Codes: H04L 47/19 at layers above the network layer network arrangements for networked applications for scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04L 47/25 with rate being modified by the source upon detecting a change of network conditions
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• 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
• CPC Class Codes: H04N 21/23805 Controlling the feeding rate to the network, e.g. by controlling the video pump
• CPC Class Codes: H04N 21/2402 Monitoring of the downstream path of the transmission network, e.g. bandwidth available traffic monitoring in data switching networks H04L43/00; monitoring data switching networks utilization H04L43/0876
• CPC Class Codes: H04N 21/2404 Monitoring of server processing errors or hardware failure error or fault detection G06F11/07; monitoring in general G06F11/30
• CPC Class Codes: H04N 21/64769 for rate control flow control in packet networks H04L47/10

Abstract

A method, apparatus and computer program product for managing content sessions within a network is presented. The systems disclosed herein are able to detect a requirement to modify bandwidth usage within the network either proactively or reactively. In response, example embodiments apply an adaptive bit rate adjustment technique to the content sessions to adjust a data rate associated with each content session according to the requirement to modify bandwidth usage within the network. Example embodiments also then apply a quality of service adjustment technique to the content sessions to adjust a bandwidth allocation assigned between a client and server based upon the adaptive bandwidth adjustment technique. Application of the adaptive bit rate and quality of service adjustment techniques may be policy based. Example embodiments also may monitor a plurality of servers supporting content sessions, detect a failure at a first server and move content sessions to a second server.

Claims

1. A method for managing content sessions within a network, the method comprising:

maintaining content sessions over the network;

detecting a requirement to modify bandwidth usage within the network;

applying an adaptive bandwidth adjustment technique to the content sessions, the adaptive bandwidth adjustment technique adjusting a data rate of data associated with each content session, according to the requirement to modify bandwidth usage within the network; and

applying a quality of service adjustment technique to the content sessions, the quality of service adjustment technique adjusting a bandwidth allocation assigned between a client and server for each content session, based upon the adaptive bandwidth adjustment technique.

2. The method of claim 1 wherein detecting the requirement to modify bandwidth usage within the network includes proactively determining an impending bandwidth change condition within the network before occurrence of the bandwidth change condition within the network.

3. The method of claim 2 wherein applying the adaptive bandwidth adjustment technique to the content sessions includes monitoring bandwidth usage within the network to determine whether bandwidth available within the network conforms to a policy.

4. The method of claim 3 wherein monitoring bandwidth usage within the network to determine whether bandwidth available within the network conforms to a policy includes comparing bandwidth available within the network to a configurable value.

5. The method of claim 1 wherein detecting the requirement to modify bandwidth usage within the network includes detecting the requirement to modify bandwidth usage within the network reactively according to a bandwidth change condition experienced within the network.

6. The method of claim 5 wherein applying the adaptive bandwidth adjustment technique to the content sessions includes examining bandwidth usage within the network to determine a state of bandwidth availability.

7. The method of claim 6 wherein examining bandwidth usage within the network to determine the state of bandwidth availability includes analyzing content sessions within the network to determine a data rate of at least one content session that may be adjusted according to the bandwidth change condition experienced within the network.

8. The method of claim 1 wherein applying a quality of service adjustment technique to the content sessions includes adjusting bandwidth allocated to respective clients of the sessions according to the adjusted data rate of data associated with each respective content session.

9. The method of claim 8 wherein adjusting bandwidth allocated to respective clients of the sessions according to the adjusted data rate of data associated with each respective content session includes decreasing bandwidth allocated to a client to provide bandwidth for allocation to a new content session.

10. The method of claim 8 wherein adjusting bandwidth allocated to respective clients of the sessions according to the adjusted data rate of data associated with each respective content session includes increasing bandwidth allocated to a client, the bandwidth previously allocated within the network.

11. The method of claim 1 further comprising:

monitoring a plurality of servers supporting content sessions to respective clients within the network;

detecting a failure experienced at a first server in the plurality of servers;

moving content sessions supported by the first server that experienced the failure to a second server in the plurality of servers to maintain content sessions over the network.

12. The method of claim 11 wherein moving content sessions supported by the first server that experienced the failure to a second server in the plurality of servers to maintain content sessions over the network includes determining a priority of the content sessions to be moved according to a policy.

13. A computerized device for managing content sessions within a network comprising:

a memory;

a processor;

a communications interface; and

an interconnection mechanism coupling the memory, the processor and the communications interface;

wherein the memory is encoded with a bandwidth reclamation application that when executed in a process on the processor is capable of reclaiming bandwidth in the network by performing the operations of;

maintaining content sessions over the network;

detecting a requirement to modify bandwidth usage within the network;

applying an adaptive bandwidth adjustment technique to the content sessions, the adaptive bandwidth adjustment technique adjusting a data rate of data associated with each content session, according to the requirement to modify bandwidth usage within the network; and

applying a quality of service adjustment technique to the content sessions, the quality of service adjustment technique adjusting a bandwidth allocation assigned between a client and server for each content session, based upon the adaptive bandwidth adjustment technique.

14. The method of claim 13 wherein the operation of detecting the requirement to modify bandwidth usage within the network includes the operation of proactively determining an impending bandwidth change condition within the network before occurrence of the bandwidth change condition within the network.

15. The method of claim 14 wherein the operation of applying the adaptive bandwidth adjustment technique to the content sessions includes the operation of monitoring bandwidth usage within the network to determine whether bandwidth available within the network conforms to a policy.

16. The method of claim 15 wherein the operation of monitoring bandwidth usage within the network to determine whether bandwidth available within the network conforms to a policy includes the operation of comparing bandwidth available within the network to a configurable value.

17. The method of claim 13 wherein the operation of detecting the requirement to modify bandwidth usage within the network includes the operation of detecting the requirement to modify bandwidth usage within the network reactively according to a bandwidth change condition experienced within the network.

18. The method of claim 17 wherein the operation of applying the adaptive bandwidth adjustment technique to the content sessions includes the operation of examining bandwidth usage within the network to determine a state of bandwidth availability.

19. The method of claim 18 wherein the operation of examining bandwidth usage within the network to determine the state of bandwidth availability includes the operation of analyzing content sessions within the network to determine a data rate of at least one content session that may be adjusted according to the bandwidth change condition experienced within the network.

20. The method of claim 13 wherein the operation of applying a quality of service adjustment technique to the content sessions includes the operation of adjusting bandwidth allocated to respective clients of the sessions according to the adjusted data rate of data associated with each respective content session.

21. The method of claim 20 wherein the operation of adjusting bandwidth allocated to respective clients of the sessions according to the adjusted data rate of data associated with each respective content session includes the operation of decreasing bandwidth allocated to a client to provide bandwidth for allocation to a new content session.

22. The method of claim 20 wherein the operation of adjusting bandwidth allocated to respective clients of the sessions according to the adjusted data rate of data associated with each respective content session includes the operation of increasing bandwidth allocated to a client, the bandwidth previously allocated within the network.

23. The method of claim 13 further comprising the operations of:

monitoring a plurality of servers supporting content sessions to respective clients within the network;

detecting a failure experienced at a first server in the plurality of servers;

moving content sessions supported by the first server that experienced the failure to a second server in the plurality of servers to maintain content sessions over the network.

24. The method of claim 23 wherein the operation of moving content sessions supported by the first server that experienced the failure to a second server in the plurality of servers to maintain content sessions over the network includes the operation of determining a priority of the content sessions to be moved according to a policy.

25. A computer readable medium encoded with computer readable code that when executed on a processor in a computerized device provides content session management within a network, the medium comprising:

instructions for maintaining content sessions over the network;

instructions for detecting a requirement to modify bandwidth usage within the network;

instructions for applying an adaptive bandwidth adjustment technique to the content sessions, the adaptive bandwidth adjustment technique adjusting a data rate of data associated with each content session, according to the requirement to modify bandwidth usage within the network; and

instructions for applying a quality of service adjustment technique to the content sessions, the quality of service adjustment technique adjusting a bandwidth allocation assigned between a client and server for each content session, based upon the adaptive bandwidth adjustment technique.