Media segment monitoring

• US 7,796,532 B2
• Filed: 05/31/2006
• Issued: 09/14/2010
• Est. Priority Date: 05/31/2006
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Umansky, Ilya, Xu, Xiaode, Connor, Kevin Joseph, Padmanabhan, Radhika, Shaikh, Mohammed Taher
• Primary Examiner(s): Pham; Chi H.
• Assistant Examiner(s): MEW, KEVIN D
• Application Number:
  US11/444,652
• Publication Number:
  US 20070280127A1
• Time in Patent Office: 1,567 Days
• Field of Search: 370/252, 370/253, 370/242, 370/244, 370/245, 370/389, 370/392, 370/352, 370/353, 370/354, 370/356, 370/400, 370/401, 370/428, 370/235, 709/231, 709/232, 709/233, 709/234
• US Class Current: 370/252
• CPC Class Codes: H04L 43/0835 One way packet loss
• CPC Class Codes: H04L 43/087 Jitter
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/80 Responding to QoS

Abstract

A device and method provides a means for monitoring a media segment of a Real-time Transport Protocol (RTP) media stream without interfering with end-to-end monitoring of the RTP media stream. The device includes a media segment monitor to generate segment control messages associated with a selected segment of the RTP media stream transmitted between a source endpoint and a destination endpoint in a packet network. The device further includes an interface to transmit and receive the segment control messages; and a processor to process the segment control messages, the segment control messages including call quality metrics related to the selected segment of the RTP media stream.

Claims

1. A method, comprising:

transmitting a Real-time Transport Protocol (RTP) media stream from a source endpoint to a destination endpoint in a packet network;

monitoring a selected segment of the RTP media stream between and excluding the source endpoint and the destination endpoint, wherein monitoring the selected segment does not interfere with monitoring the RTP media stream from the source endpoint to the destination endpoint;

transmitting and receiving control messages associated with the selected RTP media stream segment, the control messages including a set of call quality metrics;

transmitting and receiving an end-to-end Real-time Transport Control Protocol (RTCP) control message, the end-to-end RTCP control message including a set of call quality metrics related to the RTP media stream from the source endpoint to the destination endpoint;

receiving a control message associated with the transmitted RTP media stream at a network node located between the source endpoint and the destination endpoint;

identifying the received control message according to a packet type identifier;

processing the received control message at the network node if the control message is associated with the selected RTP stream segment; and

forwarding the received control message out of the network node if the control message is associated with the end-to-end RTCP control message.

2. The method of claim 1, wherein the selected RTP media stream segment corresponds to a selected network node pair located between, and excluding, the source endpoint and the destination endpoint in the packet network.

3. The method of claim 2, wherein the selected network node pair corresponds to adjacent network nodes.

4. The method of claim 1, wherein the set of call quality metrics includes delay, jitter, and packet loss.

5. A device, comprising:

a media segment monitor configured to generate segment control messages associated with a selected segment of a Real-time Transport Protocol (RTP) media stream transmitted between a source endpoint and a destination endpoint in a packet network, wherein the selected segment corresponds to a network node pair located between, and excluding, the source endpoint and the destination endpoint in the packet network;

an interface configured to transmit and receive control messages including the segment control messages, wherein the interface is further configured to identify a designation of the control messages received; and

a processor configured to process the control messages that are designated as the segment control messages, wherein the segment control messages comprise call quality metrics related to the selected segment of the RTP media stream, and wherein the control messages that are designated as end-to-end Real-time Transport Control Protocol (RTCP) control messages are forwarded to the destination endpoint.

6. The device of claim 5, wherein the interface further transmits and receives the end-to-end RTCP control messages, and wherein the end-to-end RTCP control messages comprise a set of call quality metrics related to the RTP media stream from the source endpoint to the destination endpoint.

7. The device of claim 5, wherein the control messages are designated according to a packet type identifier.

8. The device of claim 7, wherein the end-to-end RTCP control messages are forwarded from the network node pair to the destination endpoint.

9. The device of claim 5, wherein the interface comprises a plurality of ports to transmit and receive packets.

10. The device of claim 9, wherein the segment control messages and the end-to-end RTCP control messages share a port.

11. The device of claim 10, further comprising:

a switch configured to select which of the control messages has priority to use the shared port.

28. The device of claim 5, wherein the interface comprises a first port and a second port, wherein the segment control messages are assigned to the first port, and wherein the end-to-end RTCP control messages are assigned to the second port.

12. A device, comprising:

means for generating segment control messages associated with a selected segment of a Real-time Transport Protocol (RTP) media stream transmitted between a source endpoint and a destination endpoint in a packet network, the selected segment corresponding to a network node pair located between and excluding the source endpoint and the destination endpoint in the packet network;

means for identifying control messages received by the device as the segment control messages or as end-to-end Real-time Transport Control Protocol (RTCP) control messages; and

means for processing the control messages that are associated with the selected segment of the RTP media stream, wherein the segment control messages comprise call quality metrics related to the selected segment of the RTP media stream, and wherein the end-to-end RTCP control messages are forwarded to the destination endpoint.

13. The device of claim 12, wherein the control messages are identified by a packet type identifier of the control messages, and wherein the end-to-end RTCP control messages comprise a set of call quality metrics related to the RTP media stream from the source endpoint to the destination endpoint.

14. The device of claim 13, wherein the end-to-end RTCP control messages are identified according to the packet type identifier.

15. The device of claim 13, further comprising:

means for forwarding the end-to-end RTCP control messages from the network node pair to the destination endpoint.

16. The device of claim 14, further comprising:

means for prioritizing transmission of the end-to-end RTCP control messages according to the packet type identifier.

29. The device of claim 12, wherein the network node pair comprises a first node and a second node, wherein a first segment control message is transmitted from the first node to the second node, and wherein a second segment control message is transmitted from the second node to the first node.

17. An article of non-transitory computer-readable medium containing instructions that, when executed by a system, cause the system to perform operations comprising:

generating segment control messages associated with a selected segment of a Real-time Transport Protocol (RTP) media stream transmitted between a source endpoint and a destination endpoint in a packet network, wherein the selected segment corresponds to a network node pair located between, and excluding, the source endpoint and the destination endpoint in the packet network;

designating control messages received by one or more nodes of the network node pair as the segment control messages or as end-to-end Real-time Transport Control Protocol (RTCP) control messages;

processing the control messages designated as segment control messages, wherein the segment control messages comprise call quality metrics related to the selected segment of the RTP media stream;

forwarding the control messages designated as the end-to-end RTCP control messages from the one or more nodes.

18. The article of claim 17, wherein the end-to-end RTCP control messages comprise a set of call quality metrics related to the RTP media stream from the source endpoint to the destination endpoint.

19. The article of claim 17, wherein the operations further comprise:

identifying the end-to-end RTCP control messages according to a packet type identifier of the control messages.

20. The article of claim 17, wherein the end-to-end RTCP control messages are forwarded to the destination endpoint, and wherein the segment control messages are consumed at the one or more nodes of the network node pair.

21. The article of claim 19, wherein the operations further comprise:

prioritizing transmission of the control messages received according to the packet type identifier.

30. The article of claim 17, wherein the end-to-end RTCP control messages are relayed through the selected segment to a next hop in the packet network prior to reaching the destination endpoint.

22. A system, comprising:

a plurality of network nodes configured to transmit a Real-time Transport Protocol (RTP) media stream from a source endpoint to a destination endpoint in a packet network; and

a media segment monitor configured to monitor a selected segment of the RTP media stream between the source endpoint and the destination endpoint, wherein the selected segment corresponds to a pair of network nodes located between, and excluding, the source endpoint and the destination endpoint in the packet network, wherein the media segment monitor is configured to process a received control message when the control message is associated with the selected RTP stream segment, and wherein the media segment monitor is configured to forward the received control message to the destination endpoint when the control message is associated with an end-to-end Real-time Transport Control Protocol (RTCP) control message.

23. The system of claim 22, wherein the media segment monitor is further configured to transmit and receive control messages associated with the selected RTP media stream segment, and wherein the RTP control messages comprise a set of call quality metrics.

24. The system of claim 22, wherein the media segment monitor is further configured to transmit and receive control messages associated with the end-to-end RTCP control message, and wherein the end-to-end RTCP control message comprises a set of call quality metrics related to the RTP media stream from the source endpoint to the destination endpoint.

25. The system of claim 22, wherein the media segment monitor is further configured to identify the received control message according to a packet type identifier.

26. The system of claim 23, wherein the RTP control messages are tunneled through an existing end-to-end RTCP session.

27. The system of claim 26, further comprising an interface configured to transmit and receive the RTP control messages, wherein the RTP control messages and the end-to-end RTCP control message are assigned to one port of the interface.