Method and system for quality of service (QoS) support in a packet-switched network

• US 20010053149A1
• Filed: 05/04/2001
• Published: 12/20/2001
• Est. Priority Date: 05/05/2000
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Mo, Li, DeWilde, Carl A., Sullivan, Edward T.
• Granted Patent: US 7,075,927 B2
• Time in Patent Office: Days
• US Class Current: 370/389
• CPC Class Codes: H04L 2012/5627 Fault tolerance and recovery
• CPC Class Codes: H04L 41/12 Discovery or management of network topologies
• CPC Class Codes: H04L 41/22 comprising specially adapted graphical user interfaces [GUI]
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/502 Frame based
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/25 of the same type
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A method and system for transporting traffic having disparate qualities of service classes across a packet-switched network includes receiving at an ingress node of a network a plurality of packets each comprising a quality of service (QoS) class defined externally to the network. Packets having a QoS class comprising delay bound guarantees and a low drop priority are combined into a first internal QoS class. Packets having a QoS class comprising a flexible drop priority and no delay bound guarantees are combined into a second internal QoS class. Packets having a QoS class including no delivery guarantees are combined into a third internal QoS class. The packets are transmitted in the network based on their internal QoS class.

Claims

1. A method for transporting traffic having disparate qualities of service across a packet-switch network, comprising:

receiving at an ingress point of a network a plurality of packets each comprising a quality of service (QoS) class defined externally to the network;

combining packets having a QoS class comprising delay bound guarantees and a low drop priority into a first internal QoS class;

combining packets having a QoS class comprising a flexible drop priority and no delay bound guarantees into a second internal QoS class;

combining packets having a QoS class comprising no delivery guarantees into a third internal QoS class; and

transporting the packets through the network based on their internal QoS classes.

2. The method of

claim 1

, wherein the first internal QoS class comprises a guaranteed service class, further comprising combining into the guaranteed service class packets having an externally defined integrated services guaranteed service QoS and a differentiated services expedited forwarding QoS.

3. The method of

claim 1

, wherein the second internal QoS class comprises a control load class, further comprising combining into the control load class packets having an externally defined integrated services control load QoS and a differentiated services assured forwarding 1, 2 and 3 QoS.

4. The method of

claim 1

, wherein the third internal QoS class comprises a best-effort class, further comprising combining into the best-effort class packets having a differentiated services assured forwarding 4 QoS and a differentiated services best-effort QoS.

5. The method of

claim 1

, wherein the packets combined into the first internal QoS class comprise low latency delay-bound guarantees.

6. The method of

claim 1

, further comprising generating a label for each packet including the internal QoS class for the packet and transporting the packet through the network using the label.

7. The method of

claim 1

, wherein the packets comprise internet protocol (IP) packets.

8. The method of

claim 1

, wherein packets combined into the first internal QoS class comprise real-time data.

9. The method of

claim 1

, wherein the packets combined into the first internal QoS class comprise real-time voice data.

10. A system for transporting traffic having disparate qualities of service across a packet-switch network, comprising:

means for receiving at an ingress point of a network a plurality of packets each comprising a quality of service (QoS) class defined externally to the network;

means for combining packets having a QoS class comprising delay bound guarantees and a low drop priority into a first internal QoS class;

means for combining packets having a QoS class comprising a flexible drop priority and no delay bound guarantees into a second internal QoS class;

means for combining packets having a QoS class comprising no delivery guarantees into a third internal QoS class; and

means for transporting the packets through the network based on their internal QoS classes.

11. The system of

claim 10

, wherein the first internal QoS class comprises a guaranteed service class, further comprising means for combining into the guaranteed service class packets having an externally defined integrated services guaranteed service QoS and a differentiated services expedited forwarding QoS.

12. The system of

claim 10

, wherein the second internal QoS class comprises a control load class, further comprising means for combining into the control load class packets having an externally defined integrated services control load QoS and a differentiated services assured forwarding 1, 2 and 3 QoS.

13. The system of

claim 10

, wherein the third internal QoS class comprises a best-effort class, further comprising means for combining into the best-effort class packets having a differentiated services assured forwarding 4 QoS and a differentiated services best-effort QoS.

14. The system of

claim 10

, wherein the packets combined into the first internal QoS class comprise low latency delay-bound guarantees.

15. The system of

claim 10

, further comprising means for generating a label for each packet including the internal QoS class for the packet and transporting the packet through the network using the label.

16. The system of

claim 10

, wherein the packets comprise internet protocol (IP) packets.

17. The system of

claim 10

, wherein packets combined into the first internal QoS class comprise real-time data.

18. The system of

claim 10

, wherein the packets combined into the first internal QoS class comprise real-time voice data.

19. A system for transporting traffic having disparate qualities of service across a packet-switch network, comprising:

logic encoded in media; and

the logic operable to receive at an ingress point of a network a plurality of packets each comprising a quality of service (QoS) class defined externally to the network, to combine packets having a QoS class comprising delay-bound guarantees and a low drop priority into a first internal QoS class, to combine packets having a QoS class comprising a flexible drop priority and no delay bound into a second internal QoS class, and to combine packets having a QoS class comprising no delivery guarantees into a third internal QoS class.

20. A local interface for a packet-switched network node, comprising:

a port operable to receive a plurality of packets each comprising a quality of service (QoS) class defined externally to a network of the node and to combined packets having QoS classes comprising delay-bound guarantees and a low drop priority into a first internal QoS class, to combine packets having a QoS class comprising a flexible-drop priority and no delay bound guarantees into a second internal QoS class and to combine packets having a QoS class comprising no delivery guarantees into a third QoS class and to buffer the packets in buffers corresponding to their internal QoS classes; and

a scheduler operable to schedule transmission of the packets out of the buffers for transmission over the network based on their internal QoS class.