Network architecture for a packet aware transport network

• US 8,532,137 B1
• Filed: 03/26/2004
• Issued: 09/10/2013
• Est. Priority Date: 03/26/2003
• Status: Active Grant

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Doverspike, Robert Duncan, Kalmanek, Charles Robert Jr., Ramakrishnan, Kadangode K., Afferton, Thomas Scott, Aguirre-Torres, Luis
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): Moutaouakil, Mounir
• Application Number:
  US10/810,326
• Time in Patent Office: 3,455 Days
• Field of Search: 370/401, 370465-467
• US Class Current: 370/466
• CPC Class Codes: H04J 2203/0042 Ring
• CPC Class Codes: H04J 2203/0073 Services, e.g. multimedia, GOS, QOS
• CPC Class Codes: H04J 2203/0094 Virtual Concatenation
• CPC Class Codes: H04J 3/1617 carrying packets or ATM cells
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]
• CPC Class Codes: H04L 45/68 Pseudowire emulation, e.g. IETF WG PWE3

Abstract

A method and architecture for Packet-Aware Transport Networks (PATN) which supports both packet and traditional TDM services and which leverages an assemblage of emerging technologies to provide efficient aggregation and switching of packet traffic in metro networks. The PATN provides significant cost savings to carriers by reducing the number of network elements, reducing transport costs through statistical multiplexing, and eliminating the need for redundant multiplexing operations.

Claims

1. A transport network comprising:

a gateway-multi-service switch for supporting packet and time division multiplexing services;

a gateway-multi-service switch interface for providing time division multiplexing traffic and data packets to the gateway-multi-service switch, wherein the gateway-multi-service switch performs a deep channelization to suppress idle packets embedded in the data packets, wherein the deep channelization to suppress the idle packets comprises discarding the idle packets;

a second interface between the gateway-multi-service switch and a multi-service edge for handing off the data packets without the idle packets, wherein the second interface provides the functions of;

receiving a pseudo-wire encapsulation encapsulated packet with a customer identification information payload;

encapsulating the pseudo-wire encapsulation encapsulated packet with a customer identification information payload into a multi-protocol label switching/label switched path encapsulated packet;

encapsulating the multi-protocol label switching/label switched path encapsulated packet into a generalized framing protocol based frame; and

encapsulating the generalized framing protocol based frame into a synchronous optical network physical layer; and

a third interface between the gateway-multi-service switch and a broadband-digital crossconnect system for handing off the time division multiplexing traffic.

2. The network of claim 1, wherein the third interface between the gateway-multi-service switch and the broadband-digital crossconnect system provides at least one of the following functions:

receiving a circuit emulated packet payload;

performing a reverse circuit emulation function on the circuit emulated packet payload to generate a time division multiplexing user payload; and

mapping the time division multiplexing user payload into a time division multiplexing physical layer.

3. The network of claim 1, further comprising a fourth interface between the gateway-multi-service switch and a time division multiplexing access network.

4. The network of claim 3, wherein the fourth interface between the gateway-multi-service switch and the time division multiplexing access network provides at least one of the following functions:

terminating a time division multiplexing physical layer; and

performing an idle packet suppression to produce a packet payload.

5. The network of claim 3, wherein the fourth interface between the gateway-multi-service switch and the time division multiplexing access network provides at least one of the following functions:

terminating a time division multiplexing physical layer to extract a time division multiplexing traffic payload;

performing a deep channelization to produce a time division multiplexing stream; and

performing a circuit emulation on the time division multiplexing stream to produce a circuit emulated packet payload.

6. The network of claim 1, further comprising:

a packet-multi-service switch; and

a packet-multi-service switch interface for providing at least-one of the data packets and time division multiplexing traffic to the packet-multi-service switch.

7. The network of claim 6, wherein the packet-multi-service switch interface comprises an interface between the gateway-multi-service switch and the packet-multi-service switch.

8. The network of claim 7, wherein the interface between the gateway-multi-service switch and the packet-multi-service switch provides at least one of the following functions:

receiving a packet payload or a circuit emulated packet payload;

performing a pseudo wire encapsulation on the packet payload or the circuit emulated packet payload to generate a pseudo wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload;

encapsulating the pseudo wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload into a resilient packet ring packet;

encapsulating the resilient packet ring packet into a generalized framing protocol based frame with the resilient packet ring packet; and

encapsulating the generalized framing protocol based frame with the resilient packet ring packet into a synchronous optical network physical layer.

9. The network of claim 7, wherein the interface between the gateway-multi-service switch and the packet-multi-service switch provides at least one of the following functions:

terminating a synchronous optical network physical layer;

extracting a generalized framing protocol based frame from the synchronous optical network physical layer;

extracting a resilient packet ring packet from the generalized framing protocol based frame that is extracted from the synchronous optical network physical layer;

extracting a pseudo wire encapsulation encapsulated packet from the resilient packet ring packet; and

extracting a circuit emulated packet payload from the pseudo wire encapsulation encapsulated packet that is extracted from the resilient packet ring packet.

10. The network of claim 6:

wherein the packet-multi-service switch comprises two packet-multi-service switches;

wherein the packet-multi-service switch interface comprises an interface between the two packet-multi-service switches; and

wherein the interface between the two packet-multi-service switches provides at least one of the following functions;

receiving a packet payload or a circuit emulated packet payload;

performing a pseudo wire encapsulation on the packet payload or the circuit emulated packet payload to generate a pseudo wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload;

encapsulating the pseudo wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload into a resilient packet ring packet;

encapsulating the resilient packet ring packet into a generalized framing protocol based frame with the resilient packet ring packet; and

encapsulating the generalized framing protocol based frame with the resilient packet ring packet into a synchronous optical network physical layer.

11. The network of claim 6:

wherein the packet-multi-service switch interface comprises an interface between the packet-multi-service switch and a customer premise-multi service platform; and

wherein the interface between the packet-multi-service switch and the customer premise-multi service platform provides at least one of the following functions;

terminating a time division multiplexing physical layer;

performing a deep channelization to extract user data packets from the time division multiplexing physical layer; and

performing an idle packet suppression to produce a packet payload.

12. A method for providing a transport network, comprising:

providing a gateway-multi-service switch for supporting packet and time division multiplexing services;

providing a gateway-multi-service switch interface for providing time division multiplexing traffic and data packets to the gateway-multi-service switch, wherein the gateway-multi-service switch performs a deep channelization to suppress idle packets embedded in the data packets, wherein the deep channelization to suppress the idle packets comprises discarding the idle packets;

providing a second interface between the gateway-multi-service switch and a multi-service edge for handing off the data packets without the idle packets, wherein the second interface provides the functions of;

receiving a pseudo-wire encapsulation encapsulated packet with a customer identification information payload;

encapsulating the pseudo-wire encapsulation encapsulated packet with a customer identification information payload into a multi-protocol label switching/label switched path encapsulated packet;

encapsulating the multi-protocol label switching/label switched path encapsulated packet into a generalized framing protocol based frame; and

encapsulating the generalized framing protocol based frame into a synchronous optical network physical layer; and

providing a third interface between the gateway-multi-service switch and a broadband-digital crossconnect system for handing off the time division multiplexing traffic.

13. The method of claim 12, wherein the third interface between the gateway-multi-service switch and the broadband-digital crossconnect system provides at least one of the following functions:

receiving a circuit emulated packet payload;

performing a reverse circuit emulation function on the circuit emulated packet payload to generate a time division multiplexing user payload; and

mapping the time division multiplexing user payload into a time division multiplexing physical layer.

14. The method of claim 12, further comprising a fourth interface between the gateway-multi-service switch and a time division multiplexing access network, wherein the fourth interface between the gateway-multi-service switch and the time division multiplexing access network provides at least one of the following functions:

terminating a time division multiplexing physical layer; and

performing an idle packet suppression to produce a packet payload.

15. The method of claim 12, further comprising:

providing a packet-multi-service switch;

providing a packet-multi-service switch interface for providing at least one of the data packets and time division multiplexing traffic to the packet-multi-service switch, wherein the packet-multi-service switch interface comprises an interface between the gateway-multi-service switch and the packet-multi-service switch, wherein the interface between the gateway-multi-service switch and the packet-multi-service switch provides at least one of the following functions;

receiving a packet payload or a circuit emulated packet payload;

performing a pseudo-wire encapsulation on the packet payload or the circuit emulated packet payload to generate a pseudo-wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload;

encapsulating the pseudo-wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload into a resilient packet ring packet;

encapsulating the resilient packet ring packet into a generalized framing protocol based frame with the resilient packet ring packet; and

encapsulating the generalized framing protocol based frame with the resilient packet ring packet into a synchronous optical network physical layer.

16. The method of claim 12, further comprising:

providing a packet-multi-service switch;

providing a packet-multi-service switch interface for providing at least one of the data packets and time division multiplexing traffic to the packet-multi-service switch, wherein the packet-multi-service switch interface comprises an interface between the gateway-multi-service switch and the packet-multi-service switch, wherein the interface between the gateway-multi-service switch and the packet-multi-service switch provides at least one of the following functions;

terminating a synchronous optical network physical layer;

extracting a generalized framing protocol based frame from the synchronous optical network physical layer;

extracting a resilient packet ring packet from the generalized framing protocol based frame that is extracted from the synchronous optical network physical layer;

extracting a pseudo-wire encapsulation encapsulated packet from the resilient packet ring packet; and

extracting a circuit emulated packet payload from the pseudo-wire encapsulation encapsulated packet that is extracted from the resilient packet ring packet.

17. The method of claim 12, further comprising:

providing a plurality of packet-multi-service switches;

providing a packet-multi-service switch interface for providing at least one of the data packets and time division multiplexing traffic to the packet-multi-service switch, wherein the packet-multi-service switch interface comprises an interface between the plurality of packet-multi-service switches, wherein the interface between the plurality of packet-multi-service switches provides at least one of the following functions;

receiving a packet payload or a circuit emulated packet payload;

performing a pseudo-wire encapsulation on the packet payload or the circuit emulated packet payload to generate a pseudo-wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload;

encapsulating the pseudo-wire encapsulation encapsulated packet with the packet payload or the circuit emulated packet payload into a resilient packet ring packet;

encapsulating the resilient packet ring packet into a generalized framing protocol based frame with the resilient packet ring packet; and

encapsulating the generalized framing protocol based frame with the resilient packet ring packet into a synchronous optical network physical layer.

18. The method of claim 12, further comprising:

providing a packet-multi-service switch;

providing a packet-multi-service switch interface for providing at least one of the data packets and time division multiplexing traffic to the packet-multi-service switch, wherein the packet-multi-service switch interface comprises an interface between the packet-multi-service switch and a customer premise-multi-service platform, wherein the interface between the packet-multi-service switch and the customer premise-multi-service platform provides at least one of the following functions;

terminating a time division multiplexing physical layer;

performing a deep channelization to extract user data packets from the time division multiplexing physical layer; and

performing an idle packet suppression to produce a packet payload.