Methods and systems for providing differentiated quality of service in a communications system

• US 20040057437A1
• Filed: 09/24/2002
• Published: 03/25/2004
• Est. Priority Date: 09/24/2002
• Status: Active Grant

• Current Assignee: Sagemcom Broadband SAS (Sagemcom Holding SAS)
• Original Assignee: Siemens Westinghouse Power Corporation
• Inventors: Kehn, Robert D., Daniel, Wayne T., Knauber, Keith P.
• Granted Patent: US 7,321,591 B2
• Time in Patent Office: Days
• US Class Current: 370/395.43
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 2012/5618 Bridges, gateways [GW] or interworking units [IWU]
• CPC Class Codes: H04L 2012/5638 Services, e.g. multimedia, GOS, QOS
• CPC Class Codes: H04L 2012/5667 IP over ATM

Abstract

A communications system that facilitates the provision of differentiated quality of service is disclosed, including a marker for receiving a packet of data from an application (110), for examining the packet for predefined criteria, for setting the value of QoS bits in the packet based on the predefined criteria, and for forwarding the packet to a multiple Virtual Circuit (multi-VC) bridge (300). The multi-VC bridge (300) is connected to the marker and selects an Asynchronous Transfer Mode (ATM) Permanent Virtual Circuit (PVC) (120, 122, 124) over which to transmit the packet by mapping the value of the QoS bits to a PVC in a mapping table and forwards the packet over the selected PVC to a destination address.

Claims

1. A method of transmitting a packet of data from an application in a data processing system to a destination address via a selected one of a plurality of Permanent Virtual Circuits (PVCs) that is selected by a multiple Virtual Circuit (multi-VC) bridge based on a value of Quality of Service (QoS) bits in said packet, comprising the steps of:

receiving, by said multi-VC bridge, said packet;

inspecting, by said multi-VC bridge, said packet to determine said value of said QoS bits;

selecting, by said multi-VC bridge, said selected one of said plurality of PVCs by mapping said value of said QoS bits to a corresponding PVC; and

transmitting, by said multi-VC bridge, said packet to said destination address via said selected one of said plurality of PVCs.

2. The method of claim 1, further comprising the steps of determining whether said selected PVC is active, and

if said PVC is not active, sending said packet via an active lower priority PVC, and if no lower priority level PVC is active, sending said packet via a higher priority level PVC.

3. A method of prioritizing a packet of data transmitted by an application in a data processing system to facilitate transmission and prioritization of said packet in a communications system, comprising the steps of:

receiving, by a marker, said packet from said application in said data processing system;

examining, by said marker, said packet for predefined criteria;

setting, by said marker, a value of QoS bits in said packet based on said predefined criteria;

receiving, by a multi-VC bridge, said packet;

inspecting, by said multi-VC bridge, said packet to determine said value of said QoS bits;

selecting, by said multi-VC bridge, a selected one of a plurality of Asynchronous Transfer Mode (ATM) Permanent Virtual Circuits (PVCs) by mapping said value of said QoS bits to a PVC via a mapping table; and

transmitting, by said multi-VC bridge, said packet to a destination address via said selected one of said plurality of PVCs.

4. The method of claim 3 wherein said step of receiving said packet by a marker comprises receiving said packet by Point to Point Protocol over Internet (PPPoE) client software.

5. The method of claim 3 wherein said step of receiving said packet by a marker comprises receiving said packet by a router external from said data processing system.

6. The method of claim 3 wherein said predefined criteria is an indication of a physical port from which said packet arrived.

7. The method of claim 3 wherein said predefined criteria is an indication of an Internet Protocol (IP) source or destination address.

8. The method of claim 3 wherein said predefined criteria is an indication of a TCP or UDP port number.

9. The method of claim 3 wherein said predefined criteria is application information at layer 7.

10. The method of claim 3 wherein said predefined criteria is an indication of a TCP or UDP session.

11. A communications system for transmitting a packet of data from an application in a data processing system to a destination address via a selected one of a plurality of Permanent Virtual Circuits (PVCs) selected by a multiple Virtual Circuit (multi-VC) bridge based on a value of Quality of Service (QoS) bits in said packet, comprising:

means for receiving said packet;

means for inspecting said packet to determine said value of said QoS bits;

means for selecting said selected one of said plurality of PVCs by mapping said value of said QoS bits to a corresponding PVC in a mapping table; and

means for transmitting said packet to said destination address via said selected one of said plurality of PVCs.

12. A system for prioritizing a packet of data transmitted by an application in a data processing system, comprising:

means for receiving said packet from said application in said data processing system;

means for examining said packet for predefined criteria;

means for setting a value of QoS bits in said packet based on said predefined criteria;

means forwarding said packet to a multi-VC bridge;

means for inspecting, at said multi-VC bridge, said packet to determine said value of said QoS bits;

means for selecting, at said multi-VC bridge, a selected one of a plurality of Asynchronous Transfer Mode (ATM) Permanent Virtual Circuits (PVCs) by mapping said value of said QoS bits to a PVC in a mapping table; and

means for transmitting, from said multi-VC bridge, said packet to said destination address via said selected one of said plurality of PVCs.

13. A communications system for prioritizing a packet of data transmitted from an application in a data processing system to a destination address, comprising:

a marker for receiving said packet from said application, for examining said packet for predefined criteria, for setting a value of QoS bits in said packet based on predefined criteria, and for forwarding said packet to a multiple Virtual Circuit (multi-VC) bridge; and

a multi-VC bridge connected to said marker for selecting a Permanent Virtual Circuit (PVC) over which to transmit said packet by mapping said value of said QoS bits to a PVC in a mapping table and for forwarding said packet over said selected PVC to said destination address.

14. The system of claim 13 wherein said marker comprises Point to Point Protocol over Internet (PPPoE) client software in said data processing system.

15. The system of claim 13 wherein said marker comprises a router external from said data processing system.

16. The system of claim 13 wherein said predefined criteria is an indication of a physical port from which said packet arrived.

17. The system of claim 13 wherein said predefined criteria is an indication of an Internet Protocol (IP) source or destination address.

18. The system of claim 13 wherein said predefined criteria is an indication of a TCP or UDP port number.

19. The system of claim 13 wherein said predefined criteria is application information at layer 7.

20. The system of claim 13 wherein said predefined criteria is an indication of a TCP or UDP session.