Method for forming multiple bidirectional connections for use in asynchronous transfer mode switching device

• US 6,031,837 A
• Filed: 05/05/1997
• Issued: 02/29/2000
• Est. Priority Date: 10/17/1996
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hirase, Fumio
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): Ho, Tuan Q
• Application Number:
  US08/851,007
• Time in Patent Office: 1,030 Days
• Field of Search: 370/395, 370/396, 370/398, 370/400, 370/443, 370/447, 370/449, 370/461, 370/462, 370/399, 370/386, 370/397
• US Class Current: 370/395.2
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 2012/5642 Multicast/broadcast/point-multipoint, e.g. VOD
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A method for establishing bidirectional connections and multiple connections performed by an ATM switching device is disclosed, and the method may include the steps of recognizing a connection request message sent from one calling subscriber, including information concerning other n-1 called subscribers in the asynchronous transfer mode switching device transmitting the connection request message to the n-1 called subscribers, and transmitting a response to the calling subscriber from the n-1 called subscribers from the asynchronous transfer mode switching device; and establishing bidirectional connections between the calling subscriber and the called subscribers.

Claims

1. A method for forming multiple bidirectional connections for use in an asynchronous transfer mode switching device, comprising the steps of:

recognizing a connection request message sent from one calling subscriber, including information concerning other n-1 called subscribers, in said asynchronous transfer mode switching device;

transmitting the connection request message at once or sequentially to said n-1 called subscribers from the asynchronous transfer mode switching device;

transmitting a response to the calling subscriber from the asynchronous transfer mode switching device when the asynchronous transfer mode switching device receives the response sent back from one of the n-1 called subscribers;

establishing bidirectional connections between the calling subscriber and the one of the n-1 called subscribers;

converting the response into a reception message;

transmitting the reception message to all others of the called subscribers; and

establishing bidirectional connections among the n-1 called subscribers, excepting for the calling subscriber.

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

in said asynchronous transfer mode switching device, defining a single downstream connection from said calling subscriber and a single downstream connection from one of said n-1 called subscribers;

copying a cell on each of said downstream connection; and

transmitting said copy to all of said n-1 called subscribers.

5. The method according to claim 1,

wherein said connection request message from said calling subscriber includes information by which said calling subscriber may select whether to have mixing performed by said asynchronous transfer mode switching device to form one connection or n-1 connections from said asynchronous transfer mode switching device to said calling subscriber.

6. The method according to claim 5,

wherein information data for called subscribers is held in said switching device, and said information data includes information by which said called subscribers may select whether to have mixing performed by said asynchronous transfer mode switching device to form one connection or n-1 connections from said asynchronous transfer mode switching device to said called subscribers.

7. The method according to claim 1,

wherein response information or connection request messages, which said n-1 called subscribers transmit relative to said connection request messages, include information by which said called subscribers may select whether to have mixing performed by said asynchronous transfer mode switching device to form one connection from said asynchronous transfer mode switching device to said calling subscriber or to form n-1 connections.

8. The method according to claim 7,

wherein information for said called subscribers is held by said asynchronous transfer mode switching device, and said information includes information by which said called subscribers may select whether to have mixing performed by said asynchronous transfer mode switching device to form one connection from said switching device to said calling subscriber or to form n-1 connections.

9. The method according to claim 5,

wherein a plurality of mixing methods that are prepared by said asynchronous transfer mode switching device are selected in accordance with a subscriber message or data contained in subscriber information, or in accordance with a combination of said subscriber message and data contained in said subscriber information.

10. The method according to claim 1,

wherein said response message from each of said called subscribers includes band information concerning a connection and traffic level information, and a connection from one of said called subscribers to said n-1 subscribers is established under conditions different from those for a connection from said calling subscriber.

11. The method according to claim 1,

wherein when said switching device, before a message received from a specific called subscriber is to be transmitted, has not yet received a response relative to said reception request from said calling subscriber, said asynchronous transfer mode switching device verifies communication is enabled with said specific called subscriber, and said switching device waits for transmission of said received message by said specific called subscriber until said response from said specific called subscriber is received.

12. The method according to claim 1,

wherein said switching device generates data while correlating a list of subscribers forming n multiplex bidirectional connections, with connections conditions for said subscribers and call identification information and message identification information that are employed to establish connections between said subscribers and holds said data.

13. The method according to claim 1,

wherein when one of said n subscribers who constitute a bidirectional connection is to add one or more new subscribers, said subscriber transmits to said asynchronous transfer mode switching device a subscriber addition request, including information concerning said new subscriber, and said asynchronous transfer mode switching device provides information required for a subsequent connection.

14. The method according to claim 1,

wherein when a specific subscriber of said n subscribers forming a bidirectional connection is to disconnect another subscriber, said specific subscriber transmits, to said asynchronous transfer mode switching device, a disconnection request message, including information concerning said subscriber to be disconnected;

whereby said asynchronous transfer mode switching device transmits, to said subscriber who is to be disconnected, a disconnection request message together with call identification information reciting only a termination of communication, and transmits a disconnection request message reciting a connection and a deletion relative to said subscriber to be disconnected; and

upon receipt of a completion message relative to said disconnection request message, said asynchronous transfer mode switching device cuts off said connection and transmits said completion message to said specific subscriber who has requested said disconnection.

15. The method according to claim 1,

wherein when a specific subscriber of said n subscribers who constitute a bidirectional connection desires to disconnect another subscriber, said specific subscriber transmits, to said asynchronous transfer mode switching device, a disconnection request message, including information concerning said subscriber who is to be disconnected;

said asynchronous transfer mode switching device transmits, to said subscriber who is to be disconnected, a disconnection request message, together with call identification information reciting only a termination of communication, and transmits a completion message to said specific subscriber who has requested said disconnection;

said subscriber who is to be disconnected transmits a disconnection request message that recites a deletion of information that concerns said subscriber who is to be disconnected and disconnection of said subscriber who is to be disconnected;

upon receipt of said message from said subscriber who is to be disconnected, said asynchronous transfer mode switching device transmits a disconnection request message, which recites a deletion of information concerning said subscriber who is to be disconnected and disconnection of said subscriber who is to be disconnected, to all associated subscribers that are recognized by said asynchronous transfer mode switching device; and

upon receipt of responses, said data concerning said subscriber who is to be disconnected that are stored by said asynchronous transfer mode switching device are deleted and said subscriber is disconnected.

16. The method according to claim 1,

wherein when a specific subscriber of said n subscribers forming a bidirectional connection desires to disconnect another subscriber, said specific subscriber transmits, to said asynchronous transfer mode switching device, a disconnection request message, including information concerning said subscriber who is to be disconnected;

said asynchronous transfer mode switching device transmits, to said subscriber who is to be disconnected, a disconnection request message, together with call identification information, reciting only a termination of communication, and transmits a completion message to said specific subscriber who has requested said disconnection;

said subscriber who is to be disconnected transmits, together with information concerning subscribers to whom connected, a disconnection request message that recites a deletion of data that concerns said subscriber who is to be disconnected and disconnection of said subscriber who is to be disconnected; and

when said asynchronous transfer mode switching device has received said message from said subscriber who is to be disconnected, said asynchronous transfer mode switching device transmits, to all subscribers that are named in said disconnection request message, a disconnection request message that recites a deletion of information concerning said subscriber who is to be disconnected and disconnection of said subscriber who is to be disconnected; and

upon receipt of responses, said data concerning said subscriber who is to be disconnected that are stored by said asynchronous transfer mode switching device are deleted and said subscriber is disconnected.

17. The method according to claim 1,

wherein when a specific subscriber of said n subscribers forming a bidirectional connection desires to be disconnected from said bidirectional connection, said specific subscriber transmits, to said asynchronous transfer mode switching device, a disconnection request message for disconnection of said specific subscriber;

said asynchronous transfer mode switching device transmits a completion message to said specific subscriber, and also transmits to said other n-1 subscribers disconnection request messages reciting deletion of data concerning said specific subscriber and disconnection of said specific subscriber; and

upon receipt of disconnection completion messages from said n-1 subscribers, said data concerning said specific subscriber that are stored by said asynchronous transfer mode switching device are deleted and said specific subscriber is disconnected.

18. The method according to claim 1, further comprising the steps of:

in one of n subscribers forming said bidirectional connection, employing procedures that are determined in advance for mixing change to obtain a mixing that a specific subscriber has designated in a mixing change request message and changing the mixing for the specific subscriber in a bidirectional connection.

19. The method according to claim 1, further comprising the steps of:

when one of n subscribers who constitute a bidirectional connection is to terminate said bidirectional connection, transmitting a call disconnection request message to the asynchronous mode switching device from said subscriber;

transmitting a completion message to said one subscriber and disconnection request message to n-1 subscribers; and

, upon receipt of response messages relative to said disconnection request messages, disconnecting said call.

3. A method for forming multiple bidirectional connections for use in an asynchronous transfer mode switching device, comprising the steps of:

in said asynchronous transfer mode switching device,

recognizing connection request message, from one calling subscriber, including information concerning other n-1 called subscribers,

transmitting said connection request message including information concerning said calling subscriber and remaining subscribers at once or sequentially to said other n-1 called subscribers, responsive to said connections request message, from said asynchronous transfer mode switching device;

transmitting responses to said connection request message including information concerning said calling subscriber and said remaining subscribers, and transmitting connection request messages to other subscribers, by using information from each of said other n-1 called subscribers;

in said asynchronous transfer mode switching device, recognizing said connection request message sent to said other subscribers, and transmitting messages to said other subscribers;

setting a connection to said called subscriber when said asynchronous transfer mode switching device recognizes response messages from said other subscribers;

in said transfer mode switching device, defining only one downstream connection from said calling subscriber, copying cells on said connection, and transmitting a result to said other n-1 called subscribers, and setting bidirectional connections to said other n-1 called subscribers, other than said calling subscriber, when said response message relative to said connection request message form said calling subscriber.

4. A method for forming multiple bidirectional connections for use in an asynchronous transfer mode switching device comprising the steps of:

in said asynchronous transfer mode switching device, recognizing a connection request message, from one calling subscriber, including information concerning n-1 other called subscribers, and upon receipt of said connection request message, transmitting received messages at once or sequentially to said n-1 called subscribers;

returning a response message and also transmitting to said switching device a request message for connections between a pertinent subscriber and all the remaining subscribers form each of said n-1 subscribers who have received said received messages; and

in said asynchronous transfer mode switching device, receiving said request message for connection between said subscribers and transmitting a reception message to said subscribers who are to be interconnected with said pertinent subscriber, transmitting a response message to said pertinent subscriber when said asynchronous transfer mode switching device recognizes responses relative to said message received by said subscribers, and defining only one downstream connection from said subscribers, copying cells on said downstream connection, and transmitting a result said n-1 subscribers to establish bidirectional connections with said n-1 subscribers other than said calling subscriber.