Apparatus and method of transmitting call information prior to establishing a connection path

• US 5,452,293 A
• Filed: 01/27/1994
• Issued: 09/19/1995
• Est. Priority Date: 01/27/1994
• Status: Expired due to Term

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: DSC Communications Corp. (Nokia Corporation)
• Inventors: Roberts, Lawrence G., Duffie, P. Kingston, Wilkinson, I. C. Keith
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US08/188,559
• Time in Patent Office: 600 Days
• Field of Search: 370/14, 370/54, 370/60, 370/60.1, 370/68.1, 370/79, 370/94.1, 370/94.2
• US Class Current: 370/395.21
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 45/10 Routing in connection-oriented networks, e.g. X.25 or ATM
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

Call information is transmitted between broadband switching modules (12) and a broadband services switch (10). Each broadband switching module (12) receives call information from outside the broadband services switch (10) and translates the information into asynchronous transfer mode (ATM) cells. Each broadband switching module (12) also generates a route setup cell and a route teardown cell in order to establish and release a connection path to another broadband switching module (12), respectively. The broadband switching module (12) sends the route setup cell, that includes a virtual circuit identifier identifying the connection path for the calling information ATM cells, along a dedicated VCI to an intermediary broadband switching module (12). The sending broadband switching module (12) then transmits the payload ATM cells containing the calling information immediately after transmitting the route setup cell and before receiving an indication that a connection path has been established. The payload ATM cells are transmitted along a payload VCI determined by the broadband switching module (12) which was placed within the route setup cell.

Claims

1. A method of transmitting call information prior to establishing a connection path, comprising the steps of:

creating a route setup cell for specific call information corresponding to traffic of a single call;

transmitting the route setup cell to an intermediary destination in order to establish a link in a connection path for the specific call information;

transmitting the specific call information to the intermediary destination along the link of the connection path immediately after said route setup cell transmitting step and prior to receiving an indication from the intermediary destination that the link in the connection path has been established.

2. The method of claim 1, further comprising the steps of:

creating a route teardown cell for the specific call information; and

transmitting the route teardown cell to the intermediary destination at a completion of said specific call information transmitting step in order to indicate that resources for the connection path are available for reuse.

3. The method of claim 1, wherein said route setup cell transmitting step is performed on a separate signalling channel from said specific call information transmitting step.

4. The method of claim 1, further comprising the steps of:

updating the route setup cell at the intermediary destination;

transmitting the updated route setup cell to a next destination in order to establish a next link of the communication path; and

transmitting the specific call information to the next destination along the next link of the connection path prior to receiving an indication that the next link of the connection path to the next destination has been established.

5. The method of claim 1, wherein the route setup cell includes a bandwidth request for the link of the connection path indicating an amount of data within the specific call information to be transmitted.

6. The method of claim 5, further comprising the step of:

allocating a specific bandwidth within the bandwidth request for the link of the connection path.

7. The method of claim 5, further comprising the step of:

allocating a maximum bandwidth for the link of the connection path in response to a specific bandwidth within the bandwidth request that exceeds the maximum bandwidth for the link of connection path.

8. The method of claim 1, further comprising the step of:

establishing a return link in a return connection path such that the return connection path may be set up during the establishment of the connection path without requiring connection requests to set up the return connection path after the establishment of the connection path.

9. The method of claim 6, further comprising the steps of:

creating a return route setup cell for specific return call information corresponding to the specific call information;

transmitting the return route setup cell through successive return links from a final destination to origination of said single call in order to establish a return connection path; and

transmitting the return call information along the return connection path prior to establishing each return link and prior to receiving an indication that each return link in the return connection path has been established.

10. The method of claim 9, further comprising the step of:

updating the specific bandwidth allocated for each link of the connection path during the establishment of each return link of the return connection path.

11. An apparatus for transmitting call information prior to establishing a connection path, comprising:

circuitry for creating a route setup cell for specific call information corresponding to traffic for a single call, said specific call information being partitioned into a plurality of asynchronous transfer mode cells, said route setup cell created in asynchronous transfer cell format according to destination information within said asynchronous transfer mode cells;

circuitry for transmitting said route setup cell to an intermediary destination on a first signalling channel in order to establish a link in a connection path for said asynchronous transfer mode cells;

circuitry for successively transmitting said asynchronous transfer mode cells on a second signalling channel to said intermediary destination along said link of said connection path immediately following transmission of said route setup cell and prior to receiving an indication from said intermediary destination that said link of said connection path has been established;

circuitry for creating a route teardown cell corresponding to said specific call information; and

circuitry for transmitting said route teardown cell to said intermediary destination on said first signalling channel immediately after completing transmission of said asynchronous transfer mode cells in order to indicate that resources used to establish said link in said connection path are now available for reuse.

12. The apparatus of claim 11, wherein said route setup cell includes a bandwidth request for said link of said connection path indicating an amount of data within said specific call information to be transmitted.

13. The apparatus of claim 12, further comprising:

circuitry for allocating a specific bandwidth within said bandwidth request for said link of said connection path.

14. The apparatus of claim 12, further comprising:

circuitry for allocating a maximum bandwidth for said link of said connection path in response to a specific bandwidth within said bandwidth request that exceeds said maximum bandwidth for said link of said connection path.

15. The apparatus of claim 13, further comprising:

circuitry for establishing a return link in a return connection path such that said return connection path may be set up during establishment of said connection path without requiring connection requests to set up said return connection path after establishment of said connection path.

16. The apparatus of claim 15, further comprising:

circuitry for creating a return route setup cell for specific return call information corresponding to said single call;

circuitry for transmitting said return route setup cell through successive return links from a final destination to origination of said single call in order to establish a return connection path; and

circuitry for transmitting said return call information along said return connection path prior to establishing each return link and prior to receiving an indication that each return link in said return connection path has been established.

17. The apparatus of claim 16, further comprising:

circuitry for updating said specific bandwidth allocated for each link of said connection path during said establishment of each return link of said return connection path.