IN-BAND DPI MEDIA RESERVATION MODIFICATIONS TO RFC 3313

• US 20100054257A1
• Filed: 08/28/2008
• Published: 03/04/2010
• Est. Priority Date: 08/28/2008
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Al Catel Lucent
• Inventors: Morin, Steven Edward, DOLGANOW, Andrew
• Granted Patent: US 8,159,941 B2
• Time in Patent Office: Days
• US Class Current: 370/395.210
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1083 In-session procedures
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 67/306 User profiles

Abstract

In various exemplary embodiments, a Deep Packet Inspection device is integrated into a provider edge router associated with a user agent client or provided externally. The DPI device monitors the exchange of packets between an originating proxy and a user agent client and inspects the packets to identify SIP control messages. By monitoring the messages exchanged between the two devices, the DPI device may determine the type of application, desired QoS, source, destination, and other information related to the connection. Using this information, the router may then access a policy database to determine whether there is a QoS policy for the application and/or user. Based on this determination, the router may initiate network reservation for an anticipated data flow or store the information so the flow of packets can be remarked as the packets arrive. Accordingly, in various exemplary embodiments, the edge router is aware that QoS should be granted.

Claims

1. A system for implementing Quality of Service (QoS) for a connection between a source node and a destination node, the system comprising:

a receiver that receives data transferred between the source node and the destination node;

a transmitter that transmits data between the source node and the destination node;

a computer-readable storage medium comprising;

a policy database that stores QoS policies for nodes and applications serviced by a router, and

a connection database that stores information used to identify connections for the serviced nodes;

a Deep Packet Inspection (DPI) processor configured to intercept a control message transferred between the source node and the destination node over a control channel, extract connection information regarding the connection from the control message, and store the connection information in the connection database; and

a general processor that modifies the QoS for packets belonging to the connection using QoS information obtained by querying the policy database using the connection information.

2. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the receiver, the transmitter, the computer-readable storage medium, the DPI processor, and the general processor are integrated into the router.

3. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the receiver, the transmitter, the computer-readable storage medium, and the general processor are integrated into the router and the DPI processor is an external device in communication with the router.

4. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein:

the DPI processor is further configured to process user data associated with the control channel to identify an end-user application, and

the general processor modifies the QoS for packets belonging to the connection using QoS information obtained by querying the policy database using the connection information and the identified end-user application.

5. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the QoS policies stored in the policy database specify whether QoS may be provided for a particular user associated with the source node.

6. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the QoS policies stored in the policy database specify whether QoS may be provided for a particular application associated with the connection.

7. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the QoS policies stored in the policy database are based on at least one of an application associated with the connection, a source of the connection, a destination of the connection, and a time of day.

8. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the connection information extracted by the DPI processor comprises at least one of an application associated with the connection, a compression scheme, a media type, a source of the connection, a destination of the connection, and a port number.

9. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the general processor marks user data packets associated with the connection using at least one of a Differentiated Services Code Point (DSCP) marking and a Type of Service (ToS) marking.

10. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the general processor generates a Resource Reservation Protocol (RSVP) message for transmission along a path associated with the connection.

11. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the general processor redirects packets through pre-established network connections associated with different QoS guarantees based on the QOS granted for the connection.

12. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the source node is a user agent client in a Session Initiation Protocol (SIP) connection.

13. The system for implementing QoS for a connection between a source node and a destination node according to claim 1, wherein the destination node is a user agent server in a Session Initiation Protocol (SIP) connection.

14. A method of providing QoS for connections between a source node and a destination node, the method comprising:

forwarding a request message from the source node to the destination node over a control channel, the request message indicating that the source node seeks to establish a connection with the destination node;

forwarding a response from the destination node to the source node, the response indicating acceptance of the connection by the destination node;

intercepting the response by a Deep Packet Inspection (DPI) processor;

extracting, by the DPI processor, connection information regarding the connection from the response; and

modifying the QoS for packets belonging to the connection based at least in part on the connection information extracted by the DPI processor.

15. The method of providing QoS for connections between a source node and a destination node according to claim 14, further comprising:

processing, by the DPI processor, user data associated with the control channel to identify an end-user application, and

modifying the QoS for packets belonging to the connection based at least in part on the connection information extracted by the DPI processor and the end-user application identified by the DPI processor.

16. The method of providing QoS for connections between a source node and a destination node according to claim 14, wherein the request message is a Session Initiation Protocol (SIP) invite request comprising a media authorization token and a Session Description Protocol (SDP) field.

17. The method of providing QoS for connections between a source node and a destination node according to claim 14, wherein the response is a SIP ringing response.

18. The method of providing QoS for connections between a source node and a destination node according to claim 14, further comprising a step of determining whether QoS provisioning is allowed for the connection by querying a policy database using the connection information.

19. The method of providing QoS for connections between a source node and a destination node according to claim 14, further comprising a step of determining how to modify the QoS by querying a policy database using the connection information.

20. The method of providing QoS for connections between a source node and a destination node according to claim 14, wherein the connection information is extracted by the DPI processor from at least one of a header field and an SDP field in the response.

21. The method of providing QoS for connections between a source node and a destination node according to claim 14, further comprising a step of storing the connection information extracted by the DPI processor in a connections database.

22. The method of providing QoS for connections between a source node and a destination node according to claim 14, wherein the step of modifying the QoS comprises sending RSVP messages to reserve bandwidth along a path associated with the connection.

23. The method of providing QoS for connections between a source node and a destination node according to claim 14, wherein the step of modifying the QoS comprises remarking packets belonging to the connection.

24. The method of providing QoS for connections between a source node and a destination node according to claim 23, wherein the step of remarking packets utilizes a Differentiated Service Code Point (DSCP) marking.

25. The method of providing QoS for connections between a source node and a destination node according to claim 23, wherein the step of remarking packets utilizes a Type of Service (ToS) marking.