CA2321505A1 - Establishing bi-directional communication sessions across a communications network - Google Patents

Establishing bi-directional communication sessions across a communications network Download PDF

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Publication number
CA2321505A1
CA2321505A1 CA002321505A CA2321505A CA2321505A1 CA 2321505 A1 CA2321505 A1 CA 2321505A1 CA 002321505 A CA002321505 A CA 002321505A CA 2321505 A CA2321505 A CA 2321505A CA 2321505 A1 CA2321505 A1 CA 2321505A1
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Canada
Prior art keywords
path
communications network
endpoint
communication session
along
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002321505A
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French (fr)
Other versions
CA2321505C (en
Inventor
Mark Robert Gibson
David Stacey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rockstar Consortium US LP
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Nortel Networks Corp
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Filing date
Publication date
Application filed by Nortel Networks Corp filed Critical Nortel Networks Corp
Publication of CA2321505A1 publication Critical patent/CA2321505A1/en
Application granted granted Critical
Publication of CA2321505C publication Critical patent/CA2321505C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1094—Inter-user-equipment sessions transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols

Abstract

On receipt of a request for a communication session over a communications network, such as an Internet Protocol communications network, a path for the session is established. In a preferred example the communications network is an MPLS network and the method uses a modified version of the SIP messaging protocol. Bandwidth along a chosen path is reserved and a messaging protocol such as CR-LDP used to establish this reserved path for the communication session. Internet protocol and MPLS communications networks typically only support uni-directional flows. Several methods for establishing bi-directional communication sessions over Internet protocol communications networks that use MPLS connections are described. This is particularly useful for telephony applications using Internet protocol communications networks. In a preferred example, the established connection provides a guaranteed level of quality of service.

Claims (37)

1. A method of establishing a bi-directional communication session between a first endpoint and a second endpoint in a communications network, said method comprising the steps of:
(i) sending a communication from said second endpoint to said first endpoint to determine a path between said second and said first endpoints;
(ii) sending a first message along said path in order to set up a first label mapping along said path, for use over said path in a forward direction; and (iii) sending a second message along said path in order to set up a second label mapping along said path, for use over said path in a reverse direction.
2. A method as claimed in claim 1 wherein said steps (ii) and (iii) of sending messages in order to set up label mappings occur substantially concurrently.
3. A method as claimed in claim 1 wherein said first and second messages are sent along said path in opposite directions.
4. A method as claimed in claim 1 wherein said communication session is provided with a specified level of quality of service.
5. A method as claimed in claim 1 wherein said communications network is an Internet protocol communications network.
6. A method as claimed in claim 1 wherein said communication session is suitable for provision of telephony services.
7. A method as claimed in claim 1 wherein said communications network comprises a plurality of nodes interconnected by links and wherein said communications network is configured such that a plurality of said links are of a specified capacity.
8. A method as claimed in claim 7 wherein nodes which are connected to a link of a specified capacity are arranged to advertise information about that link.
9. A method as claimed in claim 8 wherein said information comprises the source, destination and capacity of the link.
10. A method as claimed in claim 9 wherein said information comprises a label for use by a message protocol in order to traverse that link.
11. A method of establishing a bi-directional communication session between a first endpoint and a second endpoint in a communications network, said method comprising the steps of:
(i) sending a communication from said first endpoint to said second endpoint to determine a path between said endpoints;
(ii) sending a message along said path in order to set up a first label mapping along said path, for use over said path in a forward direction; and also to set up a second label mapping along said path, for use over said path in a reverse direction.
12. A method as claimed in claim 11 wherein said communications network comprises nodes interconnected by links, and wherein said communications network is configured such that at least some of said communications links are assigned a label for a forward direction along that link and the same label for a reverse direction along that link.
13. A method as claimed in claim 11 wherein said communication session is provided with a specified level of quality of service.
14. A method as claimed in claim 11 wherein said communications network is an Internet protocol communications network.
15. A method as claimed in claim 14 wherein said communication session is suitable for provision of telephony services.
16. A method as claimed in claim 11 wherein said communications network comprises a plurality of nodes interconnected by links and wherein said communications network is configured such that a plurality of said links are of a specified capacity.
17. A method as claimed in claim 16 wherein nodes which are connected to a link of a specified capacity are arranged to advertise information about that link.
18. A method as claimed in claim 17 wherein said information comprises the source, destination and capacity of the link.
19. A method as claimed in claim 17 wherein said information comprises a label for use by a message protocol in order to traverse that link.
20. A method of establishing a bi-directional communication session between a first endpoint and a second endpoint in a communications network, said method comprising the steps of:
(i) establishing a first uni-directional communication session between the endpoints in a forward direction;
(ii) establishing a second uni-directional communication session between the endpoints in a reverse direction;
and wherein said steps (i) and (ii) of establishing uni-directional communication sessions take place substantially concurrently.
21. A method as claimed in claim 20 wherein said communication session is provided with a specified level of quality of service.
22. A method as claimed in claim 20 wherein said communications network is an Internet protocol communications network.
23. A method as claimed in claim 22 wherein said communication session is suitable for provision of telephony services.
24. A method as claimed in claim 20 wherein said communications network comprises a plurality of nodes interconnected by links and wherein said communications network is configured such that a plurality of said links are of a specified capacity.
25. A method as claimed in claim 24 wherein nodes in said physical layer which are connected to a link of a specified capacity are arranged to advertise information about that link.
26. A method as claimed in claim 25 wherein said information comprises the source, destination and capacity of the link.
27. A method as claimed in claim25 wherein said information comprises a label for use by a message protocol in order to traverse that link.
28. A communications network comprising at least two endpoints between which it is desired to establish a bi-directional communication session, said communications network comprising:
(i) a determiner arranged to determine a path between said second and said first endpoints by sending a communication from said second endpoint to said first endpoint;
(ii) a processor arranged to send a first message along said path in order to set up a first label mapping along said path, for use over said path in a forward direction; and (iii) a processor arranged to send a second message along said path in order to set up a second label mapping along said path, for use over said path in a reverse direction.
29. A communications network as claimed in claim 28 which is an Internet protocol communications network.
30. A communications network as claimed in claim 28 which is an MPLS communications network.
31. A communications network comprising at least two endpoints between which it is desired to establish a bi-directional communication session, said communications network comprising:
(i) a determiner arranged to determine a path between said endpoints by sending a communication from said first endpoint to said second endpoint; and (ii) a processor arranged to send a message along said path in order to set up a first label mapping along said path, for use over said path in a forward direction; and also to set up a second label mapping along said path, for use over said path in a reverse direction.
32. A communications network as claimed in claim 31 which is an Internet protocol communications network.
33. A communications network as claimed in claim 31 which is an MPLS communications network.
34. A communications network comprising at least two endpoints between which it is desired to establish a bi-directional communication session, said communications network comprising:
(i) a processor arranged to establish a first uni-directional communication session between the endpoints in a forward direction; and (ii) a second processor arranged to establish a second uni-directional communication session between the endpoints in a reverse direction; and wherein said steps (i) and (ii) of establishing uni-directional communication sessions take place substantially concurrently.
35. A computer program stored on a computer readable medium said computer program being arranged to control said communications network such that:
(i) a communication is sent from said second endpoint to said first endpoint to determine a path between said second and said first endpoints;
(ii) a first message is sent along said path in order to set up a first label mapping along said path, for use over said path in a forward direction; and (iii) a second message is sent along said path in order to set up a second label mapping along said path, for use over said path in a reverse direction.
36. A computer program stored on a computer readable medium said computer program being arranged to control said communications network such that:
(i) a communication is sent from said first endpoint to said second endpoint to determine a path between said endpoints; and (ii) a message is sent along said path in order to set up a first label mapping along said path, for use over said path in a forward direction; and also to set up a second label mapping along said path, for use over said path in a reverse direction.
37. A computer program stored on a computer readable medium said computer program being arranged to control said communications network such that:
(i) a first uni-directional communication session is established between the endpoints in a forward direction;
(ii) a second uni-directional communication session is established between the endpoints in a reverse direction; and wherein said steps (i) and (ii) of establishing uni-directional communication sessions take place substantially concurrently.
CA2321505A 1999-10-01 2000-09-29 Establishing bi-directional communication sessions across a communications network Expired - Fee Related CA2321505C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/410,317 1999-10-01
US09/410,317 US6680943B1 (en) 1999-10-01 1999-10-01 Establishing bi-directional communication sessions across a communications network

Publications (2)

Publication Number Publication Date
CA2321505A1 true CA2321505A1 (en) 2001-04-01
CA2321505C CA2321505C (en) 2010-05-25

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US (1) US6680943B1 (en)
EP (1) EP1096739B1 (en)
CA (1) CA2321505C (en)
DE (1) DE60039398D1 (en)

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