ATM exchange with band camp-on registration function

• US 5,812,551 A
• Filed: 03/21/1996
• Issued: 09/22/1998
• Est. Priority Date: 07/17/1995
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kato, Takashi, Tsukazoe, Atsushi, Yoshida, Koichi, Yamashita, Tomoko
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): Bnmmoussa, A.
• Application Number:
  US08/619,404
• Time in Patent Office: 915 Days
• Field of Search: 370/230, 370/235, 370/389, 370/392, 370/398, 370/399, 370/412, 370/426, 370/430, 370/443, 370/450, 370/463, 379/201, 379/209, 379/269, 379/289
• US Class Current: 370/399
• CPC Class Codes: H04L 2012/563 Signalling, e.g. protocols, reference model
• CPC Class Codes: H04L 2012/5632 Bandwidth allocation
• CPC Class Codes: H04L 2012/5651 Priority, marking, classes
• CPC Class Codes: H04L 49/3081 ATM peripheral units, e.g. policing, insertion or extraction
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

Disclosed is an ATM exchange for granting permission to a camp-on request in a short time.

A temporarily saved band value management table for managing temporarily saved band value is provided, as is a band management table for managing empty band value in the storage device of an ATM exchange comprising a storage device, a control device, and the like. The control device selects a corresponding empty band value for a temporarily saved band value when a first camp-on request is received from a terminal, and sets the empty band value to "0." In addition, the control device adds to the temporarily saved band value a band value released by a break in communication when a camp-on request is registered, and grants permission for communication to the terminal that has issued this camp-on request when the temporarily saved band value is higher than the band value required by a registered camp-on request. The control device determines whether or not a connection request can be accepted on the basis of the empty band value stored in the band management table.

Claims

1. An ATM exchange for receiving from terminals call connection requests and camp-on requests in which band values being used are specified, and establishing on a transmission line calls for which the specified band values can be used, wherein the ATM exchange comprises:

band value storage means for dividing unused band value of the transmission line into an empty band value and a temporarily saved band value, and storing them;

camp-on request storage means for storing the contents of camp-on requests issued by each terminal, in correlation with the processing rank of these contents;

connection request response means for establishing on the transmission line the call requested by a connection request when the connection request received from a terminal is one for which the use of a band value below the empty band value stored in the band value storage means has been specified, and notifying the terminal of a refusal to connect when the connection request is such that the use of a band value exceeding the empty band value has been specified;

camp-on request registration means for establishing, upon receipt of a camp-on request from a terminal, the processing rank of this camp-on request and performing registration in the camp-on request storage means in correlation with the processing rank that identifies the camp-on request data that represent the contents of this camp-on request;

band value setting means for adding the empty band value stored in the band value storage means to the temporarily saved band value stored in the band value storage means, and setting zero for the empty band value in the band value storage means, when the registration of camp-on request data by the camp-on request registration means is performed with respect to a camp-on request storage means in which no camp-on request data have been registered;

band value updating means for adding a band value released by a disconnected call to a temporarily saved band value stored in the band value storage means when camp-on request data have been registered in the camp-on request storage means upon detection of the disconnected call in the transmission line, and adding the band value released by the disconnected call to the empty band value stored in the band value storage means when no camp-on request data have been registered in the camp-on request storage means;

camp-on request response means for establishing a call that corresponds to camp-on request data in the transmission line when the temporarily saved band value stored in the band value storage means exceeds the band value specified for use by the camp-on request data that are stored in the camp-on request storage means and that are assigned the highest processing rank; and

post-processing means for reducing the temporarily saved band value stored in the band value storage means by the band value used to set up a call when it is set up by the camp-on request response means, and erasing the camp-on request data that is stored in the camp-on request storage means and that have been used by the camp-on request response means.

2. An ATM exchange as defined in claim 1, wherein the camp-on request registration means assigns a processing rank such that when camp-on request data concerning a newly received camp-on request are registered, these camp-on request data are processed following the processing of the camp-on request data registered in the camp-on request data storage means.

3. An ATM exchange as defined in claim 1, further comprising class storage means for storing classes assigned to different terminals, wherein

the camp-on request registration means is such that when camp-on request data concerning a new camp-on request received from a terminal are stored in the camp-on request storage means, the processing rank of each piece of the camp-on request data stored in the camp-on request storage means is changed in such a way that these camp-on request data are processed in an order correlated with the classes that are assigned to these terminals and that are stored in the class storage means.

4. An ATM exchange as defined in claim 3, further comprising:

second class storage means for storing a second type of class data and waiting time data concerning each terminal;

selection means for selecting, from among the camp-on request data stored in the camp-on request storage means, camp-on request data in which the time that has elapsed following registration exceeds the waiting time data stored in the second class storage means for a terminal that has issued a camp-on request; and

second processing rank change means for changing the processing rank of each peace of the camp-on request data stored in the camp-on request storage means in such a way that the camp-on request data selected by the selection means are processed in accordance with an order that corresponds to the second class stored in the second class storage means for the terminal that has issued this camp-on request.

5. An ATM exchange as defined in claim 3, further comprising class-specific allocated band value storage means for storing interrelations between classes and allocated band values, wherein

the connection request response means is such that even in cases in which a connection request that requires the use of a band value below the empty band value in the band value storage means has been received from a terminal, a message is given that connection is refused when this band value is higher than the allocated band value stored in the class-specific allocated band value storage means for this terminal class;

and

the camp-on request registration means is such that a terminal is notified of a refusal to register a camp-on request when the band value specified for use with the camp-on request received from the terminal is higher than the allocated band value stored in the class-specific allocated band value storage means for this terminal class.

6. An ATM exchange as defined in claim 3, further comprising class-specific secured empty band value storage means for storing interrelations between classes and secured empty band values, wherein

the connection request response means establishes a requested call on the transmission line only in those cases in which the value stored in the band value storage means when a call connection has been requested by a terminal is the empty band values that exceed the value obtained by adding the requested band value and the secured empty band value stored in the class-specific secured empty band value means for this terminal;

and

the camp-on request registration means adds the secured empty band value stored in the class-specific secured empty band value means for the terminal that has issued a camp-on request to the temporarily saved band value in the band value storage means, and subtracts this secured empty band value from the empty band value in the band value storage means, when a camp-on request has been received in the absence of a monitoring object.

7. An ATM exchange as defined in claim 1, further comprising a time-specific class storage means for storing classes related to different terminals for each time period, wherein

the camp-on request registration means is such that when camp-on request data concerning a new camp-on request received from a terminal are registered in the camp-on request storage means, the processing rank of each piece of the camp-on request data stored in the camp-on request storage means is changed in such a way that these camp-on request data are processed in an order correlated with the classes that are assigned to these terminals and that are stored in the class storage means at the present time.

8. An ATM exchange as defined in claim 1, further comprising allocated band value storage means for storing interrelations between terminals and allocated band values, wherein

the connection request response means is such that even in cases in which a connection request that requires the use of a band value below the empty band value in the band value storage means has been received from a terminal, a message is given that connection is refused when this band value is higher than the allocated band value stored in the allocated band value storage means for this terminal;

and

the camp-on request registration means is such that a terminal is notified of a refusal to register a camp-on request when the band value specified for use with the camp-on request received from the terminal is higher than the allocated band value stored in the allocated band value storage means for this terminal.

9. An ATM exchange as defined in claim 1, further comprising secured empty band value storage means for storing interrelations between terminals and secured empty band values, wherein

the connection request response means establishes a requested call on the transmission line only in those cases in which the value stored in the band value storage means when a call connection has been requested by a terminal is the empty band value that exceed the value obtained by adding the requested band value and the secured empty band value stored in the secured empty band value means for this terminal;

and

the camp-on request registration means adds the secured empty band value stored in the secured empty band value means for the terminal that has issued a camp-on request to the temporarily saved band value in the band value storage means, and subtracts this secured empty band value from the empty band value in the band value storage means, when a camp-on request has been received in the absence of an object of monitoring (camp-on request).

10. An ATM exchange as defined in claim 1, further comprising caller-specific class storage means for storing interrelations between classes and caller identification information, wherein

the camp-on request registration means changes the processing rank of each piece of the camp-on request data stored in the camp-on request storage means in such a way that the camp-on request received is processed in an order corresponding to the classes that are stored in the caller-specific class storage means and that are correlated with the identification information contained in the camp-on request.

11. An ATM exchange as defined in claim 1, wherein the connection request response means gives a message about the number of pieces of the camp-on request data registered in the camp-on request storage means when a terminal is notified of a connection refusal.

12. An ATM exchange for receiving from terminals connection requests in which the band value being used are specified, and establishing on a transmission line calls for which the specified band value can be used, wherein the ATM exchange comprises:

band value storage means for dividing unused band value of the transmission line into an empty band values and a temporarily saved band values, and storing them;

camp-on request storage means for storing the contents of camp-on requests in correlation with the processing rank thereof;

connection request processing means for establishing on the transmission line the call requested by a connection request when the connection request received from a terminal is one for which the use of a band value below the empty band value stored in the band value storage means has been specified, considering the connection request to be a camp-on request when the connection request is one for which the use of a band value above the empty band value has been specified, and performing registration in the camp-on request storage means in correlation with the processing rank that identifies the camp-on request data that represent the contents of this camp-on request;

band value setting means for adding the empty band value stored in the band value storage means to the temporarily saved band value stored in the band value storage means, and setting zero for the empty band value in the band value storage means, when the registration of camp-on request data by the connection request processing means is performed with respect to a camp-on request storage means in which no camp-on request data have been registered;

band value updating means for adding a band value released by a disconnected call to a temporarily saved band value stored in the band value storage means when camp-on request data have been registered in the camp-on request storage means upon detection of the disconnected call in the transmission line, and adding the band value released by the disconnected call to an empty band value stored in the band value storage means when no camp-on request data have been registered in the camp-on request storage means;

camp-on request response means for establishing a call that corresponds to camp-on request data in the transmission line when the temporarily saved band value stored in the band value storage means exceeds the band value specified for use by the camp-on request data that are stored in the camp-on request storage means and that are assigned the highest processing rank; and

post-processing means for reducing the temporarily saved band value stored in the band value storage means by the band value used to set up a call when it is set up by the camp-on request response means, and erasing the camp-on request data that is stored in the camp-on request storage means and that have been used by the camp-on request response means.