Establishing connection across a connection-oriented first telecommunications network in response to a connection request from a second telecommunications network

• US 7,830,869 B2
• Filed: 03/06/2002
• Issued: 11/09/2010
• Est. Priority Date: 03/09/2001
• Status: Expired due to Fees

• Current Assignee: Ericsson AB (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson AB (Telefonaktiebolaget LM Ericsson)
• Inventors: Barker, Andrew James
• Primary Examiner(s): Sheikh, Ayaz R
• Assistant Examiner(s): LEE, ANDREW CHUNG CHEUNG
• Application Number:
  US10/469,802
• Publication Number:
  US 20050036484A1
• Time in Patent Office: 3,170 Days
• Field of Search: 370/244, 370/389, 370/392, 370/400, 370/401, 370/402, 370/408, 370/902, 370/907
• US Class Current: 370/389
• CPC Class Codes: H04B 10/271 Combination of different networks, e.g. star and ring configuration in the same network or two ring networks interconnected
• CPC Class Codes: H04L 12/46 Interconnection of networks
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/502 Frame based
• CPC Class Codes: H04Q 11/0062 Network aspects
• CPC Class Codes: H04Q 11/0066 Provisions for optical burst or packet networks
• CPC Class Codes: H04Q 11/0071 Provisions for the electrical-optical layer interface
• CPC Class Codes: H04Q 2011/0077 Labelling aspects, e.g. multiprotocol label switching [MPLS], G-MPLS, MPAS
• CPC Class Codes: H04Q 2011/0088 Signalling aspects
• CPC Class Codes: H04Q 2213/1301 Optical transmission, optical switches
• CPC Class Codes: H04Q 2213/13204 Protocols
• CPC Class Codes: H04Q 2213/13348 Channel/line reservation
• CPC Class Codes: H04Q 2213/13349 Network management
• CPC Class Codes: H04Q 2213/1338 Inter-exchange connection
• CPC Class Codes: H04Q 2213/13389 LAN, internet
• CPC Class Codes: Y10S 370/902 Packet switching

Abstract

A first multi protocol label switching (MPLS) enabled Internet Protocol (IP) data network is able to transmit data to a second MPLS enabled IP network via a legacy optical network, which would not otherwise be able to handle the user network interface (UNI) protocols required to be used within an MPLS network environment, by means of configuring the legacy optical network and its traditional network management system (TNMS) so that they simulate or emulate an MPLS enabled optical network. The simulation/emulation of an MPLS network is performed as follows: when a first legacy network element (NE) receives a connection request (a UNI request) from the MPLS network under a UNI protocol, the UNI request is passed to the TNMS, which then sets the required connection across the legacy network via a second edge NE to an NE of the second IP network. Once the connection has been set, the TNMS instructs the edge NE to send a return signal to the requesting network indicating that the connection has been successfully set. Data packets may then be transmitted across the network.

Claims

1. A method of operating a connection-oriented first communications network having a plurality of first network elements in which connections across the first network elements are established by a network management system, the first network being connectable to a second communications network by an edge network element, the second network having a plurality of second network elements each operative for making connections or routing data across the second network in accordance with a connection request received by the edge network element, the connection request being in accordance with a predetermined protocol, the method being performed to establish a connection across the connection-oriented first network in response to the connection request from the second network, and comprising the steps of:

a) upon the edge network element receiving the connection request from the second network, sending to the network management system information relating to the connection request;

b) sending signals by the network management system to set the connection in response to said information received from the edge network element; and

c) causing the edge network element by the network management system to send a return signal according to the predetermined protocol to the second network indicating a status of a setting of the connection.

2. The method according to claim 1, wherein the connection-oriented first network is further connectable to a third communications network by a further edge network element, the third network having a plurality of third network elements each operative for making connections or routing data across the third network in accordance with a connection request received by the further edge network element, the method further comprising the step of:

causing the further edge network element by the network management system to send a connection request according to the predetermined protocol to the third network, thereby enabling a connection of the second and third networks via the connection-oriented first network.

3. The method according to claim 1, and comprising the step of operating the connection-oriented first network such that, in use, topology information relating to the first network is not made available outside the first network.

4. The method according to claim 1, wherein the predetermined protocol is a user network interface (UNI) protocol.

5. A connection-oriented first communications network, comprising:

a plurality of first network elements in which connections across the first network elements are established by a network management system, the first communications network being interoperable with a second communications network by an edge network element, the second network having a plurality of second network elements each operative for making connections or routing data across the second network in accordance with a connection request received by the edge network element, the connection request being in accordance with a predetermined protocol, the edge network element upon receiving the connection request from the second network, being operative for sending to the network management system information relating to the connection request, the network management system being operative for sending signals to the first network elements to set a connection in response to said information received from the edge network element, and the network management system being operative for causing the edge network element to send a return signal according to the predetermined protocol to the second network indicating a status of a setting of the connection.

6. The connection-oriented first communications network according to claim 5, and further comprising a further edge network element for connecting the first network to a third communications network having a plurality of third network elements each operative for making connections or routing data across the third network in accordance with a connection request received by the further edge network element, the network management system being configured to cause the further edge network element to send the connection request according to the predetermined protocol to the third network, thereby enabling the connection of the second and third networks via the first network.

7. The connection-oriented first communications network according to claim 5, wherein the first network is operated such that, in use, topology information relating to the first network is not made available outside the first network.

8. The connection-oriented first communications network according to claim 5, wherein the predetermined protocol is a user network interface (UNI) protocol.

9. The connection-oriented first communications network according to claim 5, wherein the first network is an optical communications network.

10. The connection-oriented first communications network according to claim 5, wherein the second network elements of the second network are operative for establishing connections or routing data in accordance with multi-protocol label switching (MPLS).

11. A method of operating a first communications network having a plurality of first network elements and a network management system, wherein connections across the first network elements are established by the network management system, the first network being connectable to a second communications network by an edge network element, the second network having a plurality of second network elements each operative for making connections or routing data across the second network in accordance with a connection request received by the edge network element, wherein the first and second networks use different switching or routing techniques, the connection request being in accordance with a predetermined protocol, the method being performed to establish a connection across the first network in response to the connection request from the second network, and comprising the steps of:

a) the network management system receiving information relating to the connection request from the edge network element;

b) the network management system sending signals to set the connection in response to said information received from the edge network element; and

c) the network management system sending a signal to the edge network element to cause the edge network element to send a return signal according to the predetermined protocol to the second network indicating a status of a setting of the connection.

12. The method according to claim 11, wherein a connection request is made in a client-server arrangement, in which the first communications network is a server network and the second network is a client network.

13. The method according to claim 11, wherein the first communications network is a connection-oriented network.

14. An edge network element for use in a connection-oriented first communications network having a plurality of first network elements in which connections across the first network elements are established by a network management system, the edge network element being characterized in that:

the edge network element is operative for connecting the first communications network to a second communications network having a plurality of second network elements,

the edge network element is operative for receiving a connection request in accordance with a predetermined protocol, each of the plurality of second network elements being operative for making connections or routing data across the second communications network in accordance with the connection request,

wherein the edge network element is, in order to establish a connection across the connection-oriented first network, configured to receive the connection request from the second communications network, and to send information relating to the connection request to the network management system, and to receive a signal from the network management system, and the received signal causing the edge network element to send a return signal, according to the predetermined protocol to the second communications network, indicating a status of a setting of the connection established by the network management system, and

wherein the connection is established by the network management system sending signals to set the connection in response to information relating to the connection request received from the edge network element.

15. A network management system, characterized in that:

the network management system establishes connections across a plurality of first network elements of a connection-oriented first communications network, the connection-oriented first communications network being connectable to a second communications network having a plurality of second network elements by an edge network element, each of the plurality of second network elements being operative for making connections or routing data across the second communications network in accordance with a connection request in accordance with a predetermined protocol received by the edge network element,

wherein the network management system is, in order to establish a connection across the connection-oriented first communications network, configured to receive information relating to the connection request from the edge network element, the edge network element receiving the connection request from the second communications network, and

wherein the network management system is further configured to send signals to set the connection in response to the received information, and to send a signal to the edge network element to cause the edge network element to send a return signal according to the predetermined protocol to the second communications network, and the return signal indicating a status of a setting of the connection.