Virtual private network over asynchronous transfer mode

• US 7,136,386 B2
• Filed: 07/19/2001
• Issued: 11/14/2006
• Est. Priority Date: 07/19/2001
• Status: Expired due to Fees

• Current Assignee: SBC Technology Resources, Inc. (AT&T, Inc.)
• Original Assignee: SBC Technology Resources, Inc. (AT&T, Inc.)
• Inventors: Salguero, Anna, Allen, Keith Joseph, Chen, Weijing
• Primary Examiner(s): Lee, Andrew C.
• Application Number:
  US09/907,606
• Publication Number:
  US 20030016676A1
• Time in Patent Office: 1,944 Days
• Field of Search: 370/395.1, 370/466, 370/465, 370/467, 370/397, 370/395.52, 370/395.54, 370/395.5, 370/401
• US Class Current: 370/395.5
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 2012/5667 IP over ATM
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A communications network and method enable broadband service subscribers to dynamically select broadband service destinations they wish to access from subscriber customer premises equipment. The communications network is an ATM network including a plurality of ATM switches. The network also includes at least one directory server connected to the ATM network, at least one fiber terminating device connected to the at least one directory server, and at least one broadband destination connected to the ATM network. Furthermore, the subscribers'"'"' customer premise equipment is connected to the at least one fiber terminating device. The method includes receiving a session request, which identifies a destination, in the at least one service gateway, wherein the session request is transmitted over a broadband connection using an Internet protocol. Next, using the at least one service gateway, an ATM network address of the destination from the at least one directory server is retrieved. Then an SVC is launched over the ATM network from the at least one service gateway to connect the subscriber to the ATM network address. Finally, the subsequent packets are forwarded to the destination over the ATM SVC connection.

Claims

1. A method for enabling broadband service subscribers to dynamically access, from subscriber customer premises equipment, broadband service destinations via an ATM network comprising a plurality of ATM switches, the customer premises equipment being connected to at least one service gateway via at least one fiber terminating device, the at least one service gateway being connected to at least one directory server, the method comprising:

receiving a session request, which identifies a selected one of the broadband destinations, in the at least one service gateway, wherein the session request is transmitted over a broadband connection using an Internet protocol;

retrieving, using the at least one service gateway, an ATM network address of the selected broadband destination from the at least one directory server;

launching an SVC over the ATM network from the at least one service gateway to connect the subscriber to the ATM network address; and

forwarding the session request and subsequent packets to the selected destination to establish a session over the ATM SVC connection,

wherein when the subscriber terminates the session, the at least one service gateway tears down the ATM SVC connection, and

wherein the at least one service gateway retains the ATM SVC connection for a predetermined period of time before the ATM SVC connection is torn down.

2. The method according to claim 1, further comprising concurrently establishing multiple sessions for one subscriber using a plurality of ATM SVC connections mapped to a plurality of different destinations.

3. The method according to claim 1, further comprising sharing the ATM SVC connection with a plurality of subscribers such that each subscriber has a session established to the same destination.

4. The method according to claim 3, wherein connection sharing is established by multiplexing each of the plurality of subscribers sessions onto a single SVC connection using one of Layer 2 Tunneling Protocol and PPP Tunnel Aggregation.

5. The method according to claim 1, wherein the at least one directory server is provided with a table which correlates ATM network addresses with domain names.

6. The method according to claim 5, wherein the table further includes a connection sharing protocol for each domain name.

7. The method according to claim 5, wherein the table further indicates whether the session is exclusive for each domain name.

8. The method according to claim 5, wherein the table further includes whether caller I.D., for security purposes, is provided when sessions are established to the destination identified by the domain name.

9. The method according to claim 1, wherein the retrieving further comprises querying the at least one directory server with a domain name, and receiving back the respective ATM network address, connection sharing protocol, data on whether the session is exclusive, and whether caller I.D. for security purposes is provided, for the domain name which has been queried.

10. The method according to claim 1, wherein the at least one service gateway is provided with a database which is updated each time a subscriber logs in and logs out, to internally track existing ATM SVC connections.

11. The method according to claim 1, wherein the at least one service gateway comprises a plurality of service gateways located in different geographical regions.

12. The method according to claim 11, wherein the plurality of service gateways access different directory servers which are loaded with ATM network addresses for different geographical regions, thus preventing service gateways in one region from launching ATM SVCs to destinations in other regions.

13. The method according to claim 1, wherein the at least one fiber terminating device and the at least one broadband service gateway are integrated into one unit.

14. The method according to claim 1, wherein the at least one fiber terminating device comprises one of a multiplexer and a cable television head-end.

15. The method according to claim 1, further comprising establishing a permanent virtual connection between the subscriber customer premise equipment and the at least one service gateway.

16. The method according to claim 1, wherein the Internet protocol comprises point-to-point protocol (PPP).

17. A data communications network for enabling a broadband service subscriber to dynamically select at least one broadband service destination from subscriber customer premises equipment, the communications network comprising:

an ATM network including a plurality of ATM switches;

at least one fiber terminating device;

at least one directory server; and

at least one broadband service gateway connected to the ATM network, the at least one fiber terminating device, and the at least one directory server, the at least one service gateway receiving Internet protocol packets, associated with a session request and transmitted from the customer premises equipment, via the at least one fiber terminating device, the at least one service gateway then launching an ATM SVC connection over the ATM network to connect the subscriber to the at least one broadband service destination in response to the session request from the customer premises equipment,

wherein when the subscriber terminates a session, the at least one broadband service gateway tears down the ATM SVC connection, and

wherein the at least one service gateway retains the ATM SVC connection for a predetermined period of time before the ATM SVC connection is torn down.

18. The communications network according to claim 17, wherein point-to-point protocol (PPP) is used to transmit data from the customers premise equipment to the at least one service gateway.

19. The communications network according to claim 17, further comprising a permanent virtual connection between the customer premises equipment and the at least one service gateway.

20. The communications network according to claim 17, wherein the at least one service gateway comprises a plurality of gateways located in different geographical regions.

21. The communications network according to claim 20, wherein the plurality of gateways access different directory servers which are loaded with ATM network addresses appropriate for each different geographical region, preventing gateways in one region from launching ATM SVCs to destinations in another region.

22. The communications network according to claim 17, further comprising a permanent virtual connection established between the at least one service gateway and the at least one directory server.

23. The communications network according to claim 17, wherein the at least one fiber terminating device and the at least one broadband service gateway are integrated into one unit.

24. The communications network according to claim 17, wherein the at least one service gateway is provided with a database which internally tracks existing ATM SVC connections.

25. The communications network according to claim 17, further comprising concurrently established multiple sessions for the subscriber using a plurality of ATM SVC connections mapped to a plurality of different destinations.

26. The communications network according to claim 17, further comprising sharing a single ATM SVC connection with a plurality of subscribers such that each subscriber has a unique session established to the same destination.

27. The communications network according to claim 26, wherein connection sharing comprises multiplexing each session into a single SVC connection using one of Layer 2 Tunneling Protocol and PPP Tunnel Aggregation.

28. The communications network according to claim 17, wherein the at least one directory server is provided with a table which correlates ATM network addresses with domain names.

29. The communications network according to claim 28, wherein the table further includes a connection sharing protocol for each domain name.

30. The communications network according to claim 28, wherein the table further indicates whether the session is exclusive for each domain name.

31. The communications network according to claim 17, wherein the at least one broadband service gateway queries the at least one directory server with a domain name, and the at least one service gateway receives back a respective ATM network address, and connection sharing protocol data indicating whether the session is exclusive, for that respective domain name.

32. The communications network according to claim 17, wherein the at least one fiber terminating device comprises one of a multiplexer and cable television head-end.

33. A computer readable medium storing a computer program that enables broadband service subscribers to dynamically access, from subscriber customer premises equipment, broadband service destinations via an ATM network comprising a plurality of ATM switches, the customer premises equipment being connected to at least one service gateway via at least one fiber terminating device, the at least one service gateway being connected to at least one directory server, the computer readable medium comprising:

a code segment that receives a session request, which identifies a selected one of the broadband destinations, in the at least one service gateway, wherein the session request is transmitted over a broadband connection using an Internet protocol;

a code segment that retrieves, using the at least one service gateway, an ATM network address of the selected broadband destination from the at least one directory server;

a code segment that launches an SVC over the ATM network from the at least one service gateway to connect the subscriber to the ATM network address;

a code segment that forwards the session request and subsequent packets to the selected destination to establish a session over the ATM SVC connection, and

a tear down code segment that tears down the ATM SVC connection when the subscriber terminates the session, the ATM SVC connection being retained for a predetermined period of time before the ATM SVC connection is torn down.