US20110128964A1 - Atm connection band control method and control system - Google Patents

Atm connection band control method and control system Download PDF

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US20110128964A1
US20110128964A1 US12/956,016 US95601610A US2011128964A1 US 20110128964 A1 US20110128964 A1 US 20110128964A1 US 95601610 A US95601610 A US 95601610A US 2011128964 A1 US2011128964 A1 US 2011128964A1
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connection
band
svc
data
memory
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US12/956,016
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Shinichi Ukon
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Juniper Networks Inc
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Juniper Networks Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5629—Admission control
    • H04L2012/5631—Resource management and allocation
    • H04L2012/5632—Bandwidth allocation

Definitions

  • the present invention relates generally asynchronous transfer mode (ATM) connection band control method and a control system. More particularly, the invention relates to an ATM connection band control method and a system effectively using connection bands which respective ATM circuit ports have.
  • ATM synchronous transfer mode
  • the conventional ATM connection band control system includes an input circuit 1 an input buffer control portion 2 c , an ATM switch control portion 3 c and an output buffer control portion 4 .
  • the input buffer control portion 2 c includes a buffer accumulation memory 21 c for accumulating input cells before feeding to an ATM switch an input buffer function portion 22 c performing writing control of ATM cells to a buffer accumulation memory and queue management of the buffer, a usage parameter control (UPC) portion 23 c monitoring whether a traffic of a user in communication exceeds a band declared upon switched virtual connection (SVC) setting demand or not, a connection admission control (CAC) portion 24 c controlling whether a demand is to be admitted or not upon reception of signaling of connection setting demand for new SVC of constant bit rate (CBR) a real time variable bit rate (rt-VBR), a non-real time variable bit rate (nrt-VBR), a buffer control memory 26 c storing parameter or data necessary for operation of the input buffer function portion 22 c and the usage parameter control (UPC) portion 23 c , and a circuit interface control portion 20 c interfacing the input buffer function portion 22 c and the input circuit 1 for feeding the input cell to the ATM switch.
  • CBR
  • the ATM switch control portion 3 c includes an ATM switch 30 c performing switching of the ATM cell, CPU 31 c performing central control process of overall system and a main memory 32 c for residence of operation program or data necessary for operation of CPU 31 c.
  • FIG. 10 is a detailed block diagram showing a buffer control memory 26 c relating to the connection band of SVC of FIG. 9 and its peripheral control portion.
  • the buffer control memory 26 c includes a memory 261 c storing band data per declared connection upon SVC setting demand necessary for control operation of the usage parameter control (UPC) portion 23 c , a memory 263 c storing connection band data of SVC of CBR, rt-VBR, nrt-VBR, and a memory 264 c for storing data necessary for other connection admission control, such as available band of ATM circuit port and so forth.
  • UPC usage parameter control
  • connection band data of SVC of currently established connection is present in the buffer control memory 26 c for performing connection admission control and connection band control.
  • connection band control and the connection admission control is performed for acquiring necessary connection band in first-come-first-set order without considering connection band of preferential SVC when the SVC of established connection issues setting demand. Therefore, when connection of the preferential SVC is not yet established and issue setting demand for connection later, the SVC setting demand is not always admitted and can be rejected until the necessary band is released in certain remaining band of the ATM circuit port.
  • connection of the preferential SVC is established if the preferential SVC is deleted once, the connection band acquired unconditionally is released. Therefore even when the preferential SVC issues setting demand again, there is not guarantee to acquire connection band. If other SVC sets the connection earlier, the setting demand may be rejected until the necessary band is released in certain remaining band of the ATM circuit port.
  • the first problem is that, in acquiring of the connection bands of each SVC of the CBR rt-VBR nrt-VBR requiring fixed band, the connection admission control (CAC) performing control on the basis of the band information of those actually established connection to acquire the band for those established connection at earlier timing for finite connection bands of each ATM circuit port.
  • CAC connection admission control
  • the second problem is that there is not means for preliminarily registering data for setting the band of the connection to be preferentially assigned without actually establishing connection and making judgment upon establishing connection.
  • the third problem is that when connection for SVC having high preference (preferential SVC) among SVCs is temporarily released for some hindrance to open the band if the preferential SVC is recovered from hindrance and the preferential SVC demands resetting of connection and connection setting demand for other SVC having low preference (non-preferential SVC) is done at earlier timing, since connection setting non-preferential SVC is performed normally, there is no guarantee for permitting resetting of the preferential SVC. Therefore whether resetting of connection is successful or not simply depends on remaining band of the ATM circuit port.
  • the fourth problem is that there is no means for performing control for ensuring and guaranteeing resetting of connection band for the preferential SVC when the connection band of the SVC having high preference, such as CBR or the like is temporarily deleted and the band is opened, and when the connection setting demand is issued by other SVC having lower preference while the connection of the preferential SVC is deleted.
  • the connection band is inherently acquired in order to demanding of setting irrespective of preferential order. Therefore, for the SVC having high preference while not used constantly connection has to be maintained irrespective whether the connection is used for communication or not to constantly occupy the connection band.
  • the fifth problem is that even when the SVC having high preference actually occupies the connection band constantly, the band may be used for the does not require fixed band, such as available bit rate (ABR), unspecified bit rate (UBR) and so forth as long as flows in the connection.
  • ABR available bit rate
  • UBR unspecified bit rate
  • the connection is not actually used, an idle data is transmitted in CBR, the band acquired by CBR may not be released unless the setting of connection is actually deleted.
  • the present invention has been worked out for solving the problems as set froth above.
  • an asynchronous transfer mode connection band control method in a system for transmitting and receiving an asynchronous transfer mode cell using an asynchronous transfer mode network comprises:
  • connection band acquiring data for preferential switched virtual connection having high preference in the asynchronous transfer mode network among connections of an asynchronous transfer mode service categories requiring a fixed band, of constant bit rate, in which a traffic is generated at a constant interval in the switched virtual connection via the asynchronous transfer mode network, and a real time variable bit rate or non-real time variable bit rate generating a variable traffic having burst characteristics in transmission rate, such as variable rate video or public network frame relay service;
  • connection band including the band acquiring data for connection admission control for the constant bit rate real time asynchronous transfer mode and the real time variable bit rate and the non real-time variable bit rate, and performing reception control under a condition where the band for the preferential switched virtual connection is constantly acquired, with controlling the connection band in a range where a band for the preferential switched virtual connection is constantly acquired and guaranteed, a band for a non-preferential switched virtual connection can be constantly acquired upon the connection admission control for the non-preferential switched virtual connection.
  • connection band of the constant bit rate, the real time variable bit rate and the non-realtime switched virtual connection is preliminarily set and stored in a buffer control memory irrespective whether a connection of the preferential switched virtual connection is established or not, and in the second step, control is performed with taking the preliminarily set band acquiring data and data necessary for the connection admission control of other connection including the connection band of the switched virtual connection used currently and data necessary for connection admission control.
  • judgment may be whether the switched virtual connection is the preferential switched virtual connection having high preference and having band being acquired.
  • connection band may be controlled within a range where the band of the preferential switched virtual connection is certainly maintained irrespective whether the connection of the preferential switched virtual connection for which the band is already reserved, is established or not by cooperation of a connection reception control processing portion and connection band controller.
  • connection admission may be controlled under a condition where a band of the preferential switched virtual connection within a range where the band of the preferential switched virtual connection is certainly maintained.
  • connection band of the preferential switched virtual connection of the constant bit rate, the real time variable bit rate and the non-real time variable bit rate is set irrespective whether the connection for the switched virtual connection is established or not, and for the preferential switched virtual connection, connection admission control and connection band control may be performed acquiring the band.
  • an asynchronous transfer mode connection band control system in a system for transmitting and receiving an asynchronous transfer mode cell utilizing an asynchronous transfer mode network comprises:
  • connection band of a preferential switched virtual connection having high preference in the asynchronous transfer mode network being stored preliminarily as a band acquiring data and storing acquired band data of a switched virtual connection currently established connection;
  • connection band control means for performing control of connection band on the basis of a total number of bands derived by a sum of the band acquiring data and the acquired band data stored in the data storage means.
  • an asynchronous transfer mode connection band control method in a method for transmitting and receiving an asynchronous transfer mode cell utilizing an asynchronous transfer mode network comprises:
  • connection band of a preferential switched virtual connection having high preference in the asynchronous transfer mode network being stored preliminarily as an band acquiring data and storing acquired band data of a switched virtual connection currently established connection;
  • connection band control step of performing control of connection band on the basis of a total number of bands derived by a sum of the band acquiring data and the acquired band data stored in the data storage means.
  • connection band control means or the connection band control step may add the band acquiring data of the connection band of the switched virtual connection when setting demand for acquiring the connection band for the switched virtual connection is issued and the demand is admitted.
  • connection band control means or the connection band control step may transfer the connection band data of demanded switched virtual connection from the band acquiring data to the acquired band data when the switched virtual connection setting demand is issued and the switched virtual connection for which setting demand is issued is the preferential switched virtual connection, for which band data is preliminarily acquired.
  • connection band control means or connection band control step may make judgment whether the switched virtual connection setting demand is to be admitted or not on the basis of a total number of bands derived by a sum of the current band acquiring data and the acquired band data when the switched virtual connection setting demand is issued and the switched virtual connection for which setting demand is issued, is not the preferential switched virtual connection, for which band data is preliminarily acquired.
  • connection band control means or connection band control step may add the connection band data of the switched virtual connection in the acquired band data when the switched virtual connection setting demand is admitted.
  • connection band control means or connection band control step may transfer the connection band data of the switched virtual connection from the acquired band data to the band acquiring data when a switched virtual connection deletion demand is issued and the switched virtual connection is the preferential switched virtual connection for which the band data is preliminarily acquired.
  • FIG. 1 is a schematic block diagram of the preferred embodiment of an ATM connection band control system according to the present invention
  • FIG. 2 is a detailed block diagram of the major part of the first embodiment of the ATM connection band control system according to the present invention
  • FIG. 3 is a flowchart showing operation of the first embodiment of the ATM connection band control system according to the invention.
  • FIG. 4 is a flowchart showing operation of the first embodiment of the ATM connection band control system according to the invention.
  • FIG. 5 is a flowchart showing operation of the first embodiment of the ATM connection band control system according to the invention.
  • FIG. 6 is a block diagram of the major part of the second embodiment of the ATM connection band control system according to the present invention.
  • FIG. 7 is a block diagram of the major part of the third embodiment of the ATM connection band control system according to the present invention.
  • FIG. 8 is a block diagram of the major part of the fourth embodiment of the ATM connection band control system according the present invention.
  • FIG. 9 is a block diagram showing the conventional ATM connection band control system.
  • FIG. 10 is a detailed block diagram showing a part of the prior art.
  • FIG. 1 is a block diagram showing the first embodiment of an ATM connection band control system according to the present invention.
  • the shown embodiment of the ATM connection band control system includes an input circuit 1 , an input buffer control portion 2 , an ATM switch control portion 3 and an output buffer control portion 4 .
  • the input buffer control portion 2 includes a buffer accumulation memory 21 for accumulating an input cell before feeding an ATM switch, an input buffer function portion 22 performing queue management of a control buffer for writing an ATM cell in the buffer accumulation memory 21 , a usage parameter control (UPC) portion 23 monitoring whether a traffic of the user in communication exceeds a band declared upon demanding setting of SVC or not, a connection admission control (CAC) portion 24 controlling whether a demand is to be admitted or not upon reception of signaling of connection setting demand for new SVC of CBR connection generating a traffic at predetermined interval via an ATM network from a calling terminal, such as voice, rt-VBR connection or nrt-VBR having variable traffic in which a transmission rate has burst property, such as variable rate video or a public network frame relay service, a connection band controller 25 performing management or judgment control of connection band data of SVC required for control operation of the connection admission control (CAC) portion 24 and data necessary for other connection admission control such as available band of the ATM circuit port and so forth, buffer control memory 26 for
  • connection admission controller is a control whether the demand is to be admitted upon receiving signaling of demand of connection setting for the SVC of CBR, rt-VBR and nrt-VBR of ATM service category requiring fixed band, and is a control held inoperative upon receiving signaling of demand of connection setting for the SVC of ABR or UBR in another ATM service category.
  • the ATM switch control portion 3 includes an ATM switch 30 performing switching of ATM cell, CPU 31 performing central control process of overall system and a main memory for residence of operation program and data necessary for operation of CPU 31 .
  • FIG. 2 is a block diagram showing the buffer control memory 26 relating to the connection band of the SVC and peripheral control portion.
  • the buffer control memory 26 as data structure in the memory 261 storing a band data per connection declared upon SVC setting demand necessary for control operation of the usage parameter control (UPC) portion 23 , a memory 262 storing band data to preliminarily acquire connection band of the preferential SVC necessary for control operation of the connection band controller 25 , a memory 263 storing connection band data of the SVC of CBR rt-VBR and nrt-VBR established current connection, and a memory 264 storing data necessary for connection admission control, such as available band and so forth of ATM circuit port.
  • UPC usage parameter control
  • SVC setting demand signaling for establishing connection of the SVC received from the ATM, network is fed to the input buffer control portion 2 from the input circuit 1 of FIG. 1 similarly to ATM cell.
  • connection admission control portion 24 upon occurrence of setting demand for acquiring connection band for the SVC content of setting demand of the SVC is checked at step S 101 . Thereafter, at step S 102 , judgment is made whether the SVC in question is the setting demand for acquiring the connection band of the preferential SVC preliminarily acquired band data presenting in the memory 262 which stores the band acquiring data of FIG. 2 .
  • a criterion for making judgment whether the SVC, for which setting is demanded, is the preferential SVC for which the band data is preliminarily acquired, or not, can be made by data which the SVC inherently have upon establishing connection, or a combination of a plurality of data.
  • VPI virtual path identifier
  • VCI virtual channel identifier
  • PCR peak cell rate
  • SCR sustainable cell rate
  • MFS maximum burst size
  • connection band controller 25 S 103
  • a total band number derived by a sum of the current band acquiring data stored in the memory 262 and the acquired band data stored in the memory 263 is calculated as a band acquiring judgment reference data (S 104 ).
  • judgment whether setting demand for acquiring connection band of SVC is admitted or not, is made by the connection band controller 25 (S 105 ).
  • connection band controller 25 When judgment is made that the setting demand for connection band acquiring can be admitted in the judgment whether the setting demand of the connection band acquiring of SVC (S 106 ) is accepted or not, process is performed to add the connection band of the SVC to be acquired in the memory 262 storing the band acquiring data in the connection band controller 25 (S 107 ).
  • step S 106 when judgment is made that the setting demand of connection band acquiring cannot be admitted, for the setting demand of connection band acquiring of SVC, rejection is notified (S 108 ). Then, process for acquiring connection band is terminated.
  • the content of the setting demand of SVC is checked to make judgment whether the SVC in question is the preferential SVC already acquired the band data presenting in the memory 262 which stores the band acquiring data of FIG. 2 , at step S 202 .
  • the judgment can be made by data which the SVC inherently have upon establishing connection, or a combination of a plurality of data similarly to step S 102 of FIG. 3 .
  • the SVC judgment is made whether the setting demanded SVC is the preferential SVC which has been acquired preliminarily or not.
  • the result of judgment at step S 202 indicates that the SVC setting demand can be admitted when the SVC for which setting is demanded is the preferential SVC for which the band data is acquired preliminarily (S 203 ). Accordingly, the process for transferring the demanded connection band data from the memory 262 which stores band acquiring data to the memory 263 storing the acquired band data, is performed by the connection band controller 25 (S 204 ). Then, to the connection admission control portion 24 , execution of the acceptable process for the SVC setting demand is notified (S 209 ).
  • the total band number is derived from the sum of the content of the memory 262 storing the band acquiring data and the content of the memory 263 storing the acquired band data as the band admission judgment reference data (S 205 ). Then, on the basis of the band admission judgment reference data and data necessary for other CAC, judgment is made whether the SVC setting'demand is to be admitted or not by the connection band controller 25 (S 206 ).
  • connection band controller 25 for adding the connection band data of the demanded SVC in the memory 263 storing the acquired band data (S 208 ). Then, similarly to the case where the SVC for which setting is demanded at step S 202 is the preferential SVC for which the band data is preliminarily acquired, execution of the admission process for the SVC setting demand is notified to the connection admission control portion 24 .
  • the band data per connection declared upon SVC setting demand is registered in the memory 261 which stores the band data per connection, by the connection admission control portion 24 (S 210 ).
  • rejection of admission for the SVC setting demand is notified to the connection admission control portion 24 (S 211 ). Then, the process of accepting connection of the SVC is terminated.
  • connection deletion control of FIG. 5 upon occurrence of SVC setting deletion demand at step S 301 , the SVC to be deleted is checked.
  • step S 302 judgment is made whether the SVC in question is the preferential SVC already acquired the band data in the memory which stores the band acquiring data of FIG. 2 or not.
  • the judgment can be made by data which the SVC inherently have upon establishing connection, or a combination of a plurality of data similarly to step S 102 of FIG. 3 .
  • the SVC judgment is made whether the setting demanded SVC is the preferential SVC which has been acquired preliminarily.
  • the result of judgment at step S 302 indicates that the SVC for which deleting is demanded is the preferential SVC for which the band data is acquired preliminarily
  • the process for transferring the demanded connection band data from the memory 263 which stores acquired band data to the memory 262 storing the band acquiring data is performed by the connection band controller 25 (S 303 ).
  • process for the SVC setting deletion demand is executed to delete the connection band data declared upon demanding SVC setting from the memory 261 which stores the band data per connection (S 304 ).
  • a process for deleting setting of SVC is terminated.
  • the result of judgment at step 302 indicates that the SCV for which deleting demanded is not the preferential SVC for which the band data is acquired preliminarily the process for deleting the deleted connection band data from the memory 263 which stores acquired band data, is performed by the connection band controller 25 (S 305 ). Then, process for the SVC setting deletion demand is executed to delete the connection band data declared upon demanding SVC setting from the memory 261 which stores the band data per connection (S 304 ). Then, a process for deleting setting of SVC is terminated, as the result of judgment as step 302 indicates that the SVC for which deleting is demanded is the preferential SVC for which the band data is acquired preliminarily.
  • the usage parameter control (UPC) portion 23 and the memory 261 storing the band data per connection declared upon SVC setting demanding performs control and function for setting and deleting connection of the SVC.
  • the connection admission control (CAC) portion 24 and a memory 764 storing data necessary for other CAC, such as available band of the ATM circuit port, perform setting and deletion of connection of SVC of CBR, rt-VBR and nrt-VBR.
  • connection band data to be preliminarily set as band acquiring data of the connection band
  • a memory 763 storing the connection band data of CBR, rt-VBR and nrt-VBR which hap already been established connection
  • the connection band controller 25 which controls these connections are performed not only for the SVC but also for permanent virtual circuit (PVC).
  • the memory 762 storing the band data preliminarily acquiring the connection band of the connection having high preference (hereinafter referred to as “preferential connection”) irrespective of PVC, SVC for connection such as CBR, rt-VBR, nrt-VBR of ATM service category requiring fixed band having values of a program clock reference (PCR), SCR, MBS defined in T.M4.0, the memory 763 storing the band data of the preferential connection currently established, and a memory 260 A storing data necessary for other connection admission such as available band of the ATM circuit port are formed to enable preliminarily set the band acquiring data necessary for preferential connection irrespective either PVC or SVC. Also, concerning SVC, cooperation with the connection admission control is possible.
  • connection band control including the band acquiring data in the connection band controller 25 irrespective of PVC, SVC, the connection band having low preference, for which constantly acquiring and guaranteeing the band is not required, is controlled within a range where band for the preferential connection is constantly acquired and guaranteed when the connection band for non-preferential connection is to be controlled.
  • control of band of the preferential connection including admission control of the preferential SVC among the preferential connection is performed, for which the band is constantly acquired and guaranteed irrespective whether the connection preferential SVC is established or not.
  • connection setting control portion 733 controls setting of connection of the preferential SVC, for which the required band is preliminarily set as the band acquiring data.
  • the preferential SVC can be set and deleted as required by the connection setting control portion 733 .
  • the connection admission control (CAC) portion 24 and the connection band controller 25 when the preferential SVC is unnecessary, namely when connection for the preferential SVC is not established the band reserved for the preferential SVC is available for the SVC of ABR or UBR.
  • CAC connection admission control
  • the shown embodiment is differentiated from the ATM switch control portion 3 in the first embodiment shown in FIG. 2 , in that a connection-setting portion 833 of an ATM switch control portion 3 B is provided. Also, a memory 762 for storing band acquiring data of the preferential connection in a buffer control memory 26 B and a memory 763 storing acquired band data of PVC or SVC are differentiated from the memory 262 storing the band acquiring data of the preferential. SVC and the memory 263 storing the acquired band data of SVC.
  • connection-setting control portion 833 of FIG. 8 controls setting of the preferential connection, for which the band required irrespective of PVC or SVC is preliminarily set as the band acquiring data.
  • the preferential SVC becomes necessary, namely, when the connection for the preferential SVC is to be established, the band for the preferential SVC is acquired cutting into the band for the SVC of the ABR or UBR. Therefore, even when setting of connection for the preferential SVC is established later, communication of the preferential SVC can be established normally.
  • the band for the preferential connection can be constantly and certainly acquired and guaranteed for the preferential connection. Also, connection of ABR or UBR which does not require preferential connection or when the preferential connection is not established, the band becomes open to the ABR or UBR to permit effective use of finite number of connection bands in each ATM circuit port.
  • connection setting control by managing the connection setting control by a schedule or the like, the necessary band is used for establishing connection only in a time zone which requires preferential connection, and in the time zone where the preferential connection is not required, control for temporarily deleting connection is performed in the connection setting control.
  • the connection setting control is also cooperated with the connection band control, during the period where the preferential connection is temporarily deleted, the connection setting demand for the connection requiring the fixed band is not admitted, and for the connection which does not require the fixed band the band is opened to more effectively use the finite connection bands of each ATM circuit port.
  • connection band control including the connection admission control can be realized under the condition where the band for the preferential SVC is constantly acquired and guaranteed irrespective whether the connection is currently established or not to more effectively use the finite connection bands of each ATM circuit port.
  • connection admission control is realized in the condition where the connection band of the preferential SVC is certainly acquired and guaranteed, for the connection setting demand of the SVC of low preference which connection of the preferential SVC is held broken. Furthermore, even when the connection setting demand of the preferential SVC is issued the acquired and guaranteed bans is again demanded to ensure establishment of connection again.
  • the first effect is capability of connection band control in a range where the band for the SVC of high preference and being set the band preliminarily, is acquired and guaranteed constantly upon connection admission control for the SVC of low preference and acquiring of the band being not required, by preliminarily setting the connection band of the SVC having high preference (i.e. preferential SVC) which is one of CBR, rt-VBR or the nrt-VBR requiring fixed band, and by performing connection band control with as band acquiring.
  • preferential SVC which is one of CBR, rt-VBR or the nrt-VBR requiring fixed band
  • the second effect is that, with the band setting for the SVC having high preference as set forth in the first embodiment upon connection admission control for the SVC which does not require reservation of control, and by performing connection band control in the range where the band for the SVC for which the band is reserved is constantly acquired and guaranteed, for the SVC of high preference connection band control including connection admission control can be performed under the condition where the band for the SVC of high preference is constantly acquired and guaranteed irrespective whether the connection of the preferential SVC is established or not.

Abstract

An asynchronous transfer mode (ATM) connection band control system, in an ATM network, may include a first memory, a second, different memory, and a connection-setting control portion. The first memory may store, in a buffer control memory, band acquiring data of a connection, the first memory preliminarily acquiring a connection band for the connection, irrespective of the connection being a switched virtual connection (SVC) or a permanent virtual connection (PVC). The second, different memory may store acquired band data of a currently established connection, irrespective of the currently established connection being a PVC or an SVC. The connection-setting control portion may control a setting of the currently established connection, where a band for the currently established connection, irrespective of the currently established connection being a PVC or an SVC, is preliminarily set as the band acquiring data.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates generally asynchronous transfer mode (ATM) connection band control method and a control system. More particularly, the invention relates to an ATM connection band control method and a system effectively using connection bands which respective ATM circuit ports have.
  • 2. Description of the Related Art
  • In FIG. 9, the conventional ATM connection band control system includes an input circuit 1 an input buffer control portion 2 c, an ATM switch control portion 3 c and an output buffer control portion 4.
  • The input buffer control portion 2 c includes a buffer accumulation memory 21 c for accumulating input cells before feeding to an ATM switch an input buffer function portion 22 c performing writing control of ATM cells to a buffer accumulation memory and queue management of the buffer, a usage parameter control (UPC) portion 23 c monitoring whether a traffic of a user in communication exceeds a band declared upon switched virtual connection (SVC) setting demand or not, a connection admission control (CAC) portion 24 c controlling whether a demand is to be admitted or not upon reception of signaling of connection setting demand for new SVC of constant bit rate (CBR) a real time variable bit rate (rt-VBR), a non-real time variable bit rate (nrt-VBR), a buffer control memory 26 c storing parameter or data necessary for operation of the input buffer function portion 22 c and the usage parameter control (UPC) portion 23 c, and a circuit interface control portion 20 c interfacing the input buffer function portion 22 c and the input circuit 1 for feeding the input cell to the ATM switch.
  • The ATM switch control portion 3 c includes an ATM switch 30 c performing switching of the ATM cell, CPU 31 c performing central control process of overall system and a main memory 32 c for residence of operation program or data necessary for operation of CPU 31 c.
  • FIG. 10 is a detailed block diagram showing a buffer control memory 26 c relating to the connection band of SVC of FIG. 9 and its peripheral control portion. The buffer control memory 26 c includes a memory 261 c storing band data per declared connection upon SVC setting demand necessary for control operation of the usage parameter control (UPC) portion 23 c, a memory 263 c storing connection band data of SVC of CBR, rt-VBR, nrt-VBR, and a memory 264 c for storing data necessary for other connection admission control, such as available band of ATM circuit port and so forth.
  • Only connection band data of SVC of currently established connection is present in the buffer control memory 26 c for performing connection admission control and connection band control.
  • In this case, the connection band control and the connection admission control is performed for acquiring necessary connection band in first-come-first-set order without considering connection band of preferential SVC when the SVC of established connection issues setting demand. Therefore, when connection of the preferential SVC is not yet established and issue setting demand for connection later, the SVC setting demand is not always admitted and can be rejected until the necessary band is released in certain remaining band of the ATM circuit port.
  • On the other hand, even when the connection of the preferential SVC is established if the preferential SVC is deleted once, the connection band acquired unconditionally is released. Therefore even when the preferential SVC issues setting demand again, there is not guarantee to acquire connection band. If other SVC sets the connection earlier, the setting demand may be rejected until the necessary band is released in certain remaining band of the ATM circuit port.
  • In the foregoing conventional ATM band control method, the first problem is that, in acquiring of the connection bands of each SVC of the CBR rt-VBR nrt-VBR requiring fixed band, the connection admission control (CAC) performing control on the basis of the band information of those actually established connection to acquire the band for those established connection at earlier timing for finite connection bands of each ATM circuit port. However, judgment is not made whether acquiring of band has to be done preferentially or not.
  • The second problem is that there is not means for preliminarily registering data for setting the band of the connection to be preferentially assigned without actually establishing connection and making judgment upon establishing connection.
  • The third problem is that when connection for SVC having high preference (preferential SVC) among SVCs is temporarily released for some hindrance to open the band if the preferential SVC is recovered from hindrance and the preferential SVC demands resetting of connection and connection setting demand for other SVC having low preference (non-preferential SVC) is done at earlier timing, since connection setting non-preferential SVC is performed normally, there is no guarantee for permitting resetting of the preferential SVC. Therefore whether resetting of connection is successful or not simply depends on remaining band of the ATM circuit port.
  • On the other hand, the fourth problem is that there is no means for performing control for ensuring and guaranteeing resetting of connection band for the preferential SVC when the connection band of the SVC having high preference, such as CBR or the like is temporarily deleted and the band is opened, and when the connection setting demand is issued by other SVC having lower preference while the connection of the preferential SVC is deleted. The connection band is inherently acquired in order to demanding of setting irrespective of preferential order. Therefore, for the SVC having high preference while not used constantly connection has to be maintained irrespective whether the connection is used for communication or not to constantly occupy the connection band.
  • The fifth problem is that even when the SVC having high preference actually occupies the connection band constantly, the band may be used for the does not require fixed band, such as available bit rate (ABR), unspecified bit rate (UBR) and so forth as long as flows in the connection. However the connection is not actually used, an idle data is transmitted in CBR, the band acquired by CBR may not be released unless the setting of connection is actually deleted.
    • SUMMARY OF THE INVENTION
  • The present invention has been worked out for solving the problems as set froth above.
  • According to the first aspect of the present invention, an asynchronous transfer mode connection band control method in a system for transmitting and receiving an asynchronous transfer mode cell using an asynchronous transfer mode network, comprises:
  • first step of preliminarily setting a connection band as band acquiring data for preferential switched virtual connection having high preference in the asynchronous transfer mode network among connections of an asynchronous transfer mode service categories requiring a fixed band, of constant bit rate, in which a traffic is generated at a constant interval in the switched virtual connection via the asynchronous transfer mode network, and a real time variable bit rate or non-real time variable bit rate generating a variable traffic having burst characteristics in transmission rate, such as variable rate video or public network frame relay service;
  • second step of controlling the connection band including the band acquiring data for connection admission control for the constant bit rate real time asynchronous transfer mode and the real time variable bit rate and the non real-time variable bit rate, and performing reception control under a condition where the band for the preferential switched virtual connection is constantly acquired, with controlling the connection band in a range where a band for the preferential switched virtual connection is constantly acquired and guaranteed, a band for a non-preferential switched virtual connection can be constantly acquired upon the connection admission control for the non-preferential switched virtual connection.
  • In the preferred embodiment, it is preferred that in the first step, the connection band of the constant bit rate, the real time variable bit rate and the non-realtime switched virtual connection, is preliminarily set and stored in a buffer control memory irrespective whether a connection of the preferential switched virtual connection is established or not, and in the second step, control is performed with taking the preliminarily set band acquiring data and data necessary for the connection admission control of other connection including the connection band of the switched virtual connection used currently and data necessary for connection admission control.
  • In the second step upon reception of a signal for setting demand of new switched virtual connection from a calling terminal, judgment may be whether the switched virtual connection is the preferential switched virtual connection having high preference and having band being acquired.
  • In the second step, when the new switched virtual connection setting demand from the calling terminal is for a non-preferential switched virtual connection, connection band may be controlled within a range where the band of the preferential switched virtual connection is certainly maintained irrespective whether the connection of the preferential switched virtual connection for which the band is already reserved, is established or not by cooperation of a connection reception control processing portion and connection band controller.
  • In the second step, when the new switched virtual connection from the calling terminal is the preferential switched virtual connection, for which band has already been reserved, connection admission may be controlled under a condition where a band of the preferential switched virtual connection within a range where the band of the preferential switched virtual connection is certainly maintained.
  • Data of connection band of the preferential switched virtual connection of the constant bit rate, the real time variable bit rate and the non-real time variable bit rate is set irrespective whether the connection for the switched virtual connection is established or not, and for the preferential switched virtual connection, connection admission control and connection band control may be performed acquiring the band.
  • According to the second aspect of the present invention, an asynchronous transfer mode connection band control system in a system for transmitting and receiving an asynchronous transfer mode cell utilizing an asynchronous transfer mode network, comprises:
  • data storage means for storing a connection band of a preferential switched virtual connection having high preference in the asynchronous transfer mode network being stored preliminarily as a band acquiring data and storing acquired band data of a switched virtual connection currently established connection; and
  • connection band control means for performing control of connection band on the basis of a total number of bands derived by a sum of the band acquiring data and the acquired band data stored in the data storage means.
  • According to the third aspect of the present invention, an asynchronous transfer mode connection band control method in a method for transmitting and receiving an asynchronous transfer mode cell utilizing an asynchronous transfer mode network, comprises:
  • providing data storage means for storing a connection band of a preferential switched virtual connection having high preference in the asynchronous transfer mode network being stored preliminarily as an band acquiring data and storing acquired band data of a switched virtual connection currently established connection; and
  • connection band control step of performing control of connection band on the basis of a total number of bands derived by a sum of the band acquiring data and the acquired band data stored in the data storage means.
  • In the preferred construction, the connection band control means or the connection band control step may add the band acquiring data of the connection band of the switched virtual connection when setting demand for acquiring the connection band for the switched virtual connection is issued and the demand is admitted.
  • The connection band control means or the connection band control step may transfer the connection band data of demanded switched virtual connection from the band acquiring data to the acquired band data when the switched virtual connection setting demand is issued and the switched virtual connection for which setting demand is issued is the preferential switched virtual connection, for which band data is preliminarily acquired.
  • The connection band control means or connection band control step may make judgment whether the switched virtual connection setting demand is to be admitted or not on the basis of a total number of bands derived by a sum of the current band acquiring data and the acquired band data when the switched virtual connection setting demand is issued and the switched virtual connection for which setting demand is issued, is not the preferential switched virtual connection, for which band data is preliminarily acquired.
  • The connection band control means or connection band control step may add the connection band data of the switched virtual connection in the acquired band data when the switched virtual connection setting demand is admitted.
  • The connection band control means or connection band control step may transfer the connection band data of the switched virtual connection from the acquired band data to the band acquiring data when a switched virtual connection deletion demand is issued and the switched virtual connection is the preferential switched virtual connection for which the band data is preliminarily acquired.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will be understood more fully from the detailed description given hereinafter and from the accompanying drawings of the preferred embodiment of the present invention, which, however, should not be taken to be limitative to the invention, but are for explanation and understanding only.
  • In the drawings
  • FIG. 1 is a schematic block diagram of the preferred embodiment of an ATM connection band control system according to the present invention;
  • FIG. 2 is a detailed block diagram of the major part of the first embodiment of the ATM connection band control system according to the present invention;
  • FIG. 3 is a flowchart showing operation of the first embodiment of the ATM connection band control system according to the invention;
  • FIG. 4 is a flowchart showing operation of the first embodiment of the ATM connection band control system according to the invention;
  • FIG. 5 is a flowchart showing operation of the first embodiment of the ATM connection band control system according to the invention;
  • FIG. 6 is a block diagram of the major part of the second embodiment of the ATM connection band control system according to the present invention;
  • FIG. 7 is a block diagram of the major part of the third embodiment of the ATM connection band control system according to the present invention;
  • FIG. 8 is a block diagram of the major part of the fourth embodiment of the ATM connection band control system according the present invention;
  • FIG. 9 is a block diagram showing the conventional ATM connection band control system; and
  • FIG. 10 is a detailed block diagram showing a part of the prior art.
    •  DESCRIPTION OF THE PREFERRED EMBODIMENT
  • The present invention will be discussed hereinafter in detail in terms of the preferred embodiment of the present invention with reference to the accompanying drawings. In the following description numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be obvious, however, to those skilled in the art that the present invention may be practiced without these specific detailed. In the other instance, well-known structures are not shown in detail in order to avoid unnecessary obscurity of the present invention.
  • FIG. 1 is a block diagram showing the first embodiment of an ATM connection band control system according to the present invention. The shown embodiment of the ATM connection band control system includes an input circuit 1, an input buffer control portion 2, an ATM switch control portion 3 and an output buffer control portion 4.
  • The input buffer control portion 2 includes a buffer accumulation memory 21 for accumulating an input cell before feeding an ATM switch, an input buffer function portion 22 performing queue management of a control buffer for writing an ATM cell in the buffer accumulation memory 21, a usage parameter control (UPC) portion 23 monitoring whether a traffic of the user in communication exceeds a band declared upon demanding setting of SVC or not, a connection admission control (CAC) portion 24 controlling whether a demand is to be admitted or not upon reception of signaling of connection setting demand for new SVC of CBR connection generating a traffic at predetermined interval via an ATM network from a calling terminal, such as voice, rt-VBR connection or nrt-VBR having variable traffic in which a transmission rate has burst property, such as variable rate video or a public network frame relay service, a connection band controller 25 performing management or judgment control of connection band data of SVC required for control operation of the connection admission control (CAC) portion 24 and data necessary for other connection admission control such as available band of the ATM circuit port and so forth, buffer control memory 26 for storing parameters and data necessary for operation of the input buffer function portion 22 the usage parameter control (UPC) portion 23, the connection admission controller (CAC) portion 24 and the connection band controller 25, and the interface control portion 20 for interfacing between the input buffer function portion 22 for feeding the input cell to the ATM switch and the input circuit 1.
  • It should be noted that the connection admission controller (CAC) is a control whether the demand is to be admitted upon receiving signaling of demand of connection setting for the SVC of CBR, rt-VBR and nrt-VBR of ATM service category requiring fixed band, and is a control held inoperative upon receiving signaling of demand of connection setting for the SVC of ABR or UBR in another ATM service category.
  • The ATM switch control portion 3 includes an ATM switch 30 performing switching of ATM cell, CPU 31 performing central control process of overall system and a main memory for residence of operation program and data necessary for operation of CPU 31. FIG. 2 is a block diagram showing the buffer control memory 26 relating to the connection band of the SVC and peripheral control portion.
  • The buffer control memory 26, as data structure in the memory 261 storing a band data per connection declared upon SVC setting demand necessary for control operation of the usage parameter control (UPC) portion 23, a memory 262 storing band data to preliminarily acquire connection band of the preferential SVC necessary for control operation of the connection band controller 25, a memory 263 storing connection band data of the SVC of CBR rt-VBR and nrt-VBR established current connection, and a memory 264 storing data necessary for connection admission control, such as available band and so forth of ATM circuit port.
  • Next operation of the shown embodiment will be discussed with reference to the drawings. SVC setting demand signaling for establishing connection of the SVC received from the ATM, network is fed to the input buffer control portion 2 from the input circuit 1 of FIG. 1 similarly to ATM cell.
  • At this time in the input buffer control portion 2 judgment and control whether the writing and reading in and from the buffer accumulation and the new SVC setting demand by the connection admission control portion 24 are to be accepted or not are performed.
  • Next, operations of the connection admission control portion 24, the connection band controller 25, the buffer control memory 26 and the usage parameter control portion 23 in FIGS. 1 and 2 will be discussed with reference to FIGS. 3 and 4. In operational flowchart for acquiring connection band of FIG. 3, upon occurrence of setting demand for acquiring connection band for the SVC content of setting demand of the SVC is checked at step S101. Thereafter, at step S102, judgment is made whether the SVC in question is the setting demand for acquiring the connection band of the preferential SVC preliminarily acquired band data presenting in the memory 262 which stores the band acquiring data of FIG. 2.
  • A criterion for making judgment whether the SVC, for which setting is demanded, is the preferential SVC for which the band data is preliminarily acquired, or not, can be made by data which the SVC inherently have upon establishing connection, or a combination of a plurality of data.
  • As inherent data which the SVC should have upon establishment of connection, there are a virtual path identifier (VPI) value, a virtual channel identifier (VCI) value an input and output port (number) of the SVC of CBR, rt-VBR, nrt-VBR, ABR, UBR and so forth and a peak cell rate (PCR) a sustainable cell rate (SCR), a maximum burst size (MBS) as traffic parameter defined at an ATM Forum Traffic Management Specification Version 4.0 (af-tm-0056.000, April, 1996: hereinafter referred to as “TM4.0”) and so forth. By one of these or a combination of a plurality of data, the SVC is specified to make judgment whether the setting demanded SVC is the preferential SVC, for which the band data is preliminarily acquired, or not.
  • When the setting demanded SVC is the preferential SVC, for which the band data is preliminarily acquired, a process for guarding double registration to the memory 262 storing the connection band acquiring data of FIG. 2 is performed by the connection band controller 25 (S103) to terminate the process for connection band acquiring.
  • On the other hand when the setting demanded SVC is not the preferential SVC, for which the band data is preliminarily acquired, a total band number derived by a sum of the current band acquiring data stored in the memory 262 and the acquired band data stored in the memory 263 is calculated as a band acquiring judgment reference data (S104). On the basis of the band acquiring judgment reference data and data necessary for other CAC, judgment whether setting demand for acquiring connection band of SVC is admitted or not, is made by the connection band controller 25 (S105).
  • When judgment is made that the setting demand for connection band acquiring can be admitted in the judgment whether the setting demand of the connection band acquiring of SVC (S106) is accepted or not, process is performed to add the connection band of the SVC to be acquired in the memory 262 storing the band acquiring data in the connection band controller 25 (S107).
  • On the other hand, at step S106, when judgment is made that the setting demand of connection band acquiring cannot be admitted, for the setting demand of connection band acquiring of SVC, rejection is notified (S108). Then, process for acquiring connection band is terminated.
  • In operational flowchart of the connection admission control of FIG. 4 upon occurrence of SVC setting demand 5201, the content of the setting demand of SVC is checked to make judgment whether the SVC in question is the preferential SVC already acquired the band data presenting in the memory 262 which stores the band acquiring data of FIG. 2, at step S202. As criterion for making judgment whether the SVC setting demand is the connection setting demand of the preferential SVC, for which the band data is already acquired or not, the judgment can be made by data which the SVC inherently have upon establishing connection, or a combination of a plurality of data similarly to step S102 of FIG. 3. By specifying the SVC, judgment is made whether the setting demanded SVC is the preferential SVC which has been acquired preliminarily or not.
  • Since the SVC is the preferential SVC which has been acquired the connection band via the operation flow including judgment of setting shown in FIG. 3, the result of judgment at step S202 indicates that the SVC setting demand can be admitted when the SVC for which setting is demanded is the preferential SVC for which the band data is acquired preliminarily (S203). Accordingly, the process for transferring the demanded connection band data from the memory 262 which stores band acquiring data to the memory 263 storing the acquired band data, is performed by the connection band controller 25 (S204). Then, to the connection admission control portion 24, execution of the acceptable process for the SVC setting demand is notified (S209).
  • On the other hand, if the SVC for which setting is demanded is not the preferential SVC preliminarily acquired the band data, the total band number is derived from the sum of the content of the memory 262 storing the band acquiring data and the content of the memory 263 storing the acquired band data as the band admission judgment reference data (S205). Then, on the basis of the band admission judgment reference data and data necessary for other CAC, judgment is made whether the SVC setting'demand is to be admitted or not by the connection band controller 25 (S206).
  • By the judgment whether the SVC setting demand is to be admitted or not (S207), if the SVC setting demand is judged as acceptable, process is performed in the connection band controller 25 for adding the connection band data of the demanded SVC in the memory 263 storing the acquired band data (S208). Then, similarly to the case where the SVC for which setting is demanded at step S202 is the preferential SVC for which the band data is preliminarily acquired, execution of the admission process for the SVC setting demand is notified to the connection admission control portion 24.
  • After notification of admission process at S209, the band data per connection declared upon SVC setting demand is registered in the memory 261 which stores the band data per connection, by the connection admission control portion 24 (S210). On the other hand, by making judgment whether the SVC setting demand is to be admitted or not at step S207 rejection of admission for the SVC setting demand is notified to the connection admission control portion 24 (S211). Then, the process of accepting connection of the SVC is terminated.
  • In an operational flowchart of connection deletion control of FIG. 5, upon occurrence of SVC setting deletion demand at step S301, the SVC to be deleted is checked. At step S302, judgment is made whether the SVC in question is the preferential SVC already acquired the band data in the memory which stores the band acquiring data of FIG. 2 or not. Here, as criterion for making judgment whether the connection setting demand of the preferential SVC, for which the band data is already acquired, the judgment can be made by data which the SVC inherently have upon establishing connection, or a combination of a plurality of data similarly to step S102 of FIG. 3. By specifying the SVC, judgment is made whether the setting demanded SVC is the preferential SVC which has been acquired preliminarily.
  • Since the SVC is the preferential SVC which has been acquired the connection band via the operation flow including judgment of setting shown in FIG. 3, the result of judgment at step S302 indicates that the SVC for which deleting is demanded is the preferential SVC for which the band data is acquired preliminarily, the process for transferring the demanded connection band data from the memory 263 which stores acquired band data to the memory 262 storing the band acquiring data is performed by the connection band controller 25 (S303). Then, process for the SVC setting deletion demand is executed to delete the connection band data declared upon demanding SVC setting from the memory 261 which stores the band data per connection (S304). Then, a process for deleting setting of SVC is terminated.
  • On the other hand, the result of judgment at step 302 indicates that the SCV for which deleting demanded is not the preferential SVC for which the band data is acquired preliminarily the process for deleting the deleted connection band data from the memory 263 which stores acquired band data, is performed by the connection band controller 25 (S305). Then, process for the SVC setting deletion demand is executed to delete the connection band data declared upon demanding SVC setting from the memory 261 which stores the band data per connection (S304). Then, a process for deleting setting of SVC is terminated, as the result of judgment as step 302 indicates that the SVC for which deleting is demanded is the preferential SVC for which the band data is acquired preliminarily.
  • Next, discussion will be given for the second embodiment of the ATM connection band control system according to the present invention. In the shown embodiment illustrated in FIG. 6, the usage parameter control (UPC) portion 23 and the memory 261 storing the band data per connection declared upon SVC setting demanding performs control and function for setting and deleting connection of the SVC. On the other hand, the connection admission control (CAC) portion 24 and a memory 764 storing data necessary for other CAC, such as available band of the ATM circuit port, perform setting and deletion of connection of SVC of CBR, rt-VBR and nrt-VBR. Concerning a memory 762 storing connection band data to be preliminarily set as band acquiring data of the connection band a memory 763 storing the connection band data of CBR, rt-VBR and nrt-VBR which hap already been established connection, and the connection band controller 25 which controls these connections are performed not only for the SVC but also for permanent virtual circuit (PVC).
  • Concerning the permanent virtual connection similarly to the connection band control of SVC, the memory 762 storing the band data preliminarily acquiring the connection band of the connection having high preference (hereinafter referred to as “preferential connection”) irrespective of PVC, SVC for connection such as CBR, rt-VBR, nrt-VBR of ATM service category requiring fixed band having values of a program clock reference (PCR), SCR, MBS defined in T.M4.0, the memory 763 storing the band data of the preferential connection currently established, and a memory 260A storing data necessary for other connection admission such as available band of the ATM circuit port are formed to enable preliminarily set the band acquiring data necessary for preferential connection irrespective either PVC or SVC. Also, concerning SVC, cooperation with the connection admission control is possible.
  • By connection band control including the band acquiring data in the connection band controller 25 irrespective of PVC, SVC, the connection band having low preference, for which constantly acquiring and guaranteeing the band is not required, is controlled within a range where band for the preferential connection is constantly acquired and guaranteed when the connection band for non-preferential connection is to be controlled. For the preferential connection, control of band of the preferential connection including admission control of the preferential SVC among the preferential connection is performed, for which the band is constantly acquired and guaranteed irrespective whether the connection preferential SVC is established or not. Thus, finite connection bands of each ATM circuit port can be used efficiently.
  • Next, discussion will be given for the third embodiment of the ATM connection band control system with reference to the drawings. In FIG. 7, the shown embodiment is differentiated from the ATM switch control portion in the embodiment shown in FIG. 2 in that a connection setting control portion 733 is provided in an ATM switch control portion 3A. The connection setting control portion 733 controls setting of connection of the preferential SVC, for which the required band is preliminarily set as the band acquiring data.
  • By this, since the band required for the preferential SVC is constantly acquired and guaranteed the preferential SVC can be set and deleted as required by the connection setting control portion 733. For the connection of the SVC of ABR or UBR which does not require the fixed band and is not controlled by the connection admission control (CAC) portion 24 and the connection band controller 25, when the preferential SVC is unnecessary, namely when connection for the preferential SVC is not established the band reserved for the preferential SVC is available for the SVC of ABR or UBR. Thus, the finite connection band of each ATM circuit port can be effectively used. On the other hand, when the preferential SVC becomes necessary, namely, when the connection for the preferential SVC is to be established, the band for the preferential SVC is acquired cutting into the band for the SVC of the ABR or UBR. Therefore, even when setting of connection for the preferential SVC is established later, communication of the preferential SVC can be established normally.
  • Next, discussion will be given for the fourth embodiment of the ATM connection band control system according to the present invention with reference to FIG. 8. The shown embodiment is differentiated from the ATM switch control portion 3 in the first embodiment shown in FIG. 2, in that a connection-setting portion 833 of an ATM switch control portion 3B is provided. Also, a memory 762 for storing band acquiring data of the preferential connection in a buffer control memory 26B and a memory 763 storing acquired band data of PVC or SVC are differentiated from the memory 262 storing the band acquiring data of the preferential. SVC and the memory 263 storing the acquired band data of SVC.
  • The connection-setting control portion 833 of FIG. 8 controls setting of the preferential connection, for which the band required irrespective of PVC or SVC is preliminarily set as the band acquiring data.
  • By this, since the band necessary for the preferential connection is constantly acquired and guarantee, the preferential connection irrespective of PVC or SVC can be set and deleted as required by the connection-setting control portion 833. For the connection of the SVC of ABR or UBR which does not require the fixed band and is not controlled by the connection admission control (CAC) portion 24 and the connection band controller 25, when the preferential SVC is unnecessary, namely when connection for the preferential SVC is not established, the band reserved for the preferential SVC is available for the SVC of ABR or UBR. Thus, the finite connection band of each ATM circuit port can be effectively used.
  • On the other hand, when the preferential SVC becomes necessary, namely, when the connection for the preferential SVC is to be established, the band for the preferential SVC is acquired cutting into the band for the SVC of the ABR or UBR. Therefore, even when setting of connection for the preferential SVC is established later, communication of the preferential SVC can be established normally.
  • As set forth above by cooperating the connection band control and the connection setting control, the band for the preferential connection can be constantly and certainly acquired and guaranteed for the preferential connection. Also, connection of ABR or UBR which does not require preferential connection or when the preferential connection is not established, the band becomes open to the ABR or UBR to permit effective use of finite number of connection bands in each ATM circuit port.
  • On the other hand, by managing the connection setting control by a schedule or the like, the necessary band is used for establishing connection only in a time zone which requires preferential connection, and in the time zone where the preferential connection is not required, control for temporarily deleting connection is performed in the connection setting control. The connection setting control is also cooperated with the connection band control, during the period where the preferential connection is temporarily deleted, the connection setting demand for the connection requiring the fixed band is not admitted, and for the connection which does not require the fixed band the band is opened to more effectively use the finite connection bands of each ATM circuit port.
  • As set forth above, in the shown embodiment, by preliminarily setting the connection band for the preferential SVC in the ATM network as the band acquiring data to perform connection band control including the band acquiring data and by cooperating with the connection admission control, during connection admission control for the SVC which has low preference and reservation of the bans is unnecessary, the band for the preferential SVC can be certainly acquired and guaranteed. On the other hand at the same time for the preferential SVC, connection band control including the connection admission control can be realized under the condition where the band for the preferential SVC is constantly acquired and guaranteed irrespective whether the connection is currently established or not to more effectively use the finite connection bands of each ATM circuit port.
  • For example, for the connection of the SVC having high preference (preferential SVC), even when established connection is temporarily broken by certain failure to open the band, the connection admission control is realized in the condition where the connection band of the preferential SVC is certainly acquired and guaranteed, for the connection setting demand of the SVC of low preference which connection of the preferential SVC is held broken. Furthermore, even when the connection setting demand of the preferential SVC is issued the acquired and guaranteed bans is again demanded to ensure establishment of connection again.
  • As set forth above in accordance with the present invention, the first effect is capability of connection band control in a range where the band for the SVC of high preference and being set the band preliminarily, is acquired and guaranteed constantly upon connection admission control for the SVC of low preference and acquiring of the band being not required, by preliminarily setting the connection band of the SVC having high preference (i.e. preferential SVC) which is one of CBR, rt-VBR or the nrt-VBR requiring fixed band, and by performing connection band control with as band acquiring.
  • The second effect is that, with the band setting for the SVC having high preference as set forth in the first embodiment upon connection admission control for the SVC which does not require reservation of control, and by performing connection band control in the range where the band for the SVC for which the band is reserved is constantly acquired and guaranteed, for the SVC of high preference connection band control including connection admission control can be performed under the condition where the band for the SVC of high preference is constantly acquired and guaranteed irrespective whether the connection of the preferential SVC is established or not.
  • Although the present invention has been illustrated and described with respect to exemplary embodiment thereof, it should be understood by those skilled in the art that the foregoing and various other changes, omission and additions may be made therein and thereto, without departing from the spirit and scope of the present invention. Therefore, the present invention should not be understood as limited to the specific embodiment set out above but to include all possible embodiments which can be embodied within a scope encompassed and equivalent thereof with respect to the feature set out in the appended claims.

Claims (21)

1-20. (canceled)
21. A method comprising:
determining whether band data, for a switched virtual connection (SVC), has been acquired and stored;
transferring demanded connection band data, associated with a setting demand of the SVC, from a first memory to a second, different memory when the band data has been acquired and stored; and
deleting connection band data, associated with the setting demand, stored in a third, different memory when the demanded connection band data has been transferred.
22. The method of claim 21, where the first memory further stores acquired band data,
where the second memory stores band acquiring data, and
where the third memory stores band data per connection.
23. The method of claim 21, further comprising:
determining that the band data has not been acquired and stored; and
deleting the demanded connection band data from the first memory when the band data has not been acquired and stored.
24. The method of claim 24, further comprising:
deleting the connection band data from the third memory based on the demanded connection band data being deleted from the first memory when the band data has not been acquired and stored.
25. The method of claim 21, where determining whether the band data, for the SVC, has been acquired and stored includes:
determining, based on data associated with the SVC, whether the band data has been acquired and stored.
26. The method of claim 25, where the data associated with the SVC includes at least one of a virtual path identifier (VPI) value, a virtual channel identifier (VCI) value, a real time variable bit rate (rt-VBR), a non-real time variable bit rate (nrt-VBR), or an available bit rate (ABR), and
where determining whether the band data has been acquired and stored includes:
determining whether the band data has been acquired and stored based on the at least one of the VPI value, the VCI value, the rt-VBR, the nrt-VBR, or the ABR.
27. The method of claim 25, where the setting demand of the SVC includes a setting deletion demand for the SVC, and
where transferring the demanded connection band data includes:
transferring, based on the setting deletion demand for the SVC, the demanded connection band data from the first memory to the second memory.
28. A system comprising:
a processor to:
determine, based on data associated with a switched virtual connection (SVC), whether band data has been acquired and stored for the SVC;
transfer demanded connection band data, associated with a setting demand of the SVC, from a first memory to a second, different memory when the band data has been acquired and stored for the SVC; and
provide a notification that the setting demand is accepted when the demanded connection band data has been transferred.
29. The system of claim 28, where the data associated with the SVC includes at least one of a virtual path identifier (VPI) value, a virtual channel identifier (VCI) value, a real time variable bit rate (rt-VBR), a non-real time variable bit rate (nrt-VBR), or an available bit rate (ABR), and
where, when determining, based on the data associated with the SVC, whether the band data has been acquired and stored for the SVC, the processor is to:
determine whether the band data has been acquired and stored for the SVC based on the at least one of the VPI value, the VCI value, the rt-VBR, the nrt-VBR, or the ABR.
30. The system of claim 28, where the processor is further to:
determine that the band data has not been acquired and stored for the SVC;
determine a total band amount based on at least one of data stored in the first memory or data stored in the second memory; and
determine, based on the determined total band amount, whether to admit the setting demand.
31. The system of claim 30, where the processor is further to:
determine that the setting demand is not to be admitted; and
provide a notification that the setting demand is rejected.
32. The system of claim 30, where the processor is further to:
determine that the setting demand is to be admitted; and
add the demanded connection band data to the second memory when the setting demand is to be admitted.
33. The system of claim 32, where the processor is further to:
provide a notification that the setting demand is accepted when the demanded connection band data has been added to the second memory.
34. The system of claim 28, where the processor is further to:
store band data per connection, associated with the setting demand of the SVC, in a third, different memory when the demanded connection band data has been transferred.
35. The system of claim 28, where the data associated with the SVC includes at least one of an unspecified bit rate (UBR), a peak cell rate (PCR), a sustainable cell rate (SCR), or a maximum burst size (MBS), and
where, determining, based on the data associated with the SVC, whether the band data has been acquired and stored for the SVC, the processor is to:
determine whether the band data has been acquired and stored for the SVC based on the at least one of the UBR, the PCR value, the SCR, or the MBS.
36. A method comprising:
receiving a setting demand associated with a switched virtual connection (SVC);
determining, based on data associated with the SVC, whether band data, for the (SVC), has been acquired and stored; and
when the band data has been acquired and stored, at least one of:
transferring demanded connection band data, associated with the received setting demand, from a first memory to a second, different memory; or
transferring the demanded connection band data from the second memory to the first memory,
where the first memory stores acquired band data, and
where the second memory stores band acquiring data.
37. The method of claim 36, further comprising:
deleting connection band data, associated with the setting demand, stored in a third, different memory when the demanded connection band data has been transferred from the first memory to the second memory,
where the first memory stores band acquired data,
where the second memory stores band acquiring data, and
where third memory stores band data per connection.
38. The method of claim 36, further comprising:
determining that the band data has not been acquired and stored;
determining, when the band data has not been acquired and stored, a total band amount based on at least one of data stored in the first memory or data stored in the second memory; and
determining, based on the determined total band amount, whether to admit the setting demand.
39. The method of claim 38, further comprising at least one of:
providing a notification that the setting demand is rejected when the setting demand is not admitted; and
adding the demanded connection band data to the first memory when the setting demand is admitted.
40. The method of claim 36, further comprising:
determining that the band data has not been acquired and stored; and
deleting the demanded connection band data from the first memory when the band data has not been acquired and stored.
US12/956,016 2000-01-18 2010-11-30 Atm connection band control method and control system Abandoned US20110128964A1 (en)

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US11/072,629 US7477645B2 (en) 2000-01-18 2005-03-07 ATM connection band control method and control system
US12/331,174 US7864774B2 (en) 2000-01-18 2008-12-09 ATM connection band control method and control system
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107341058A (en) * 2017-07-13 2017-11-10 郑州云海信息技术有限公司 A kind of its recovery method as resource and device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3508669B2 (en) * 2000-01-18 2004-03-22 日本電気株式会社 ATM connection bandwidth control method
US6343065B1 (en) * 2000-01-20 2002-01-29 Sbc Technology Resources, Inc. System and method of measurement-based adaptive caching of virtual connections
US6893612B2 (en) * 2001-03-09 2005-05-17 Gen-Probe Incorporated Penetrable cap
KR100929102B1 (en) 2003-02-15 2009-11-30 삼성전자주식회사 Apparatus and method for processing traffic data in asynchronous transfer mode exchange
US7477603B1 (en) * 2003-07-08 2009-01-13 Cisco Technology, Inc. Sharing line bandwidth among virtual circuits in an ATM device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020089985A1 (en) * 2000-10-27 2002-07-11 Alcatel Access control unit
US6563794B1 (en) * 1998-08-28 2003-05-13 Fujitsu Limited Boundary device for performing a connection control at a boundary between two communications networks
US6631118B1 (en) * 1998-11-10 2003-10-07 At&T Corp. System and method for providing dynamic bandwidth on demand
US7012892B1 (en) * 1999-04-16 2006-03-14 Alcatel Canada Inc. Method and apparatus for supporting connection type partitioning in a communications network
US7864774B2 (en) * 2000-01-18 2011-01-04 Juniper Networks, Inc. ATM connection band control method and control system

Family Cites Families (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5365519A (en) * 1991-03-05 1994-11-15 Hitachi, Ltd. ATM switch1ng system connectable to I/O links having different transmission rates
JP3143985B2 (en) 1991-09-04 2001-03-07 カシオ計算機株式会社 LCD projector
JP3086075B2 (en) 1992-07-10 2000-09-11 富士通株式会社 Bandwidth reservation system in ATM exchange
JP3044983B2 (en) * 1993-08-25 2000-05-22 株式会社日立製作所 Cell switching method for ATM switching system
US5923657A (en) * 1994-08-23 1999-07-13 Hitachi, Ltd. ATM switching system and cell control method
US5490141A (en) * 1994-09-30 1996-02-06 International Business Machines Corporation System and method for providing SVC service through an ATM network for frame relay DTEs with a terminal adapter
JPH08204723A (en) * 1995-01-30 1996-08-09 Fujitsu Ltd Clad equipment for atm network
JPH0949985A (en) 1995-08-10 1997-02-18 Fujitsu Ltd Projection type display device
JP3511763B2 (en) * 1995-11-17 2004-03-29 株式会社日立製作所 ATM network system and connection admission control method
JP3409966B2 (en) * 1996-06-21 2003-05-26 株式会社日立製作所 Packet switch and packet transfer control method
GB2315193B (en) * 1996-07-10 2000-11-15 Orange Personal Comm Serv Ltd Mobile communications system
JP3372797B2 (en) * 1996-12-06 2003-02-04 日本電気株式会社 Bandwidth reservation control method
JP3525656B2 (en) * 1996-12-06 2004-05-10 株式会社日立製作所 Packet switch and congestion notification method
US5953338A (en) * 1996-12-13 1999-09-14 Northern Telecom Limited Dynamic control processes and systems for asynchronous transfer mode networks
JPH10262050A (en) * 1997-03-17 1998-09-29 Fujitsu Ltd Atm exchange and atm communication system
DE19727805A1 (en) * 1997-06-30 1999-07-15 Siemens Ag Method and adaptation device for using permanent connections of an ATM communication network for communication relationships between components of a time-division-oriented communication network
JPH1132055A (en) * 1997-07-14 1999-02-02 Fujitsu Ltd Buffer controller and buffer control method
JPH11160793A (en) 1997-11-25 1999-06-18 Hitachi Ltd Optical device
US6754206B1 (en) * 1997-12-04 2004-06-22 Alcatel Usa Sourcing, L.P. Distributed telecommunications switching system and method
AU1710099A (en) * 1997-12-08 1999-06-28 Packeteer, Inc. Method for data rate control for heterogenous or peer internetworking
JP3881102B2 (en) * 1997-12-26 2007-02-14 富士通株式会社 Conversion circuit in mixed network
JPH11266258A (en) * 1998-03-17 1999-09-28 Fujitsu Ltd Atm network device
US6091730A (en) * 1998-03-30 2000-07-18 Lucent Technologies Inc. Control of asynchronous transfer mode (ATM) switching networks
US6091731A (en) * 1998-03-30 2000-07-18 Lucent Technologies Inc. Duplication in asychronous transfer mode (ATM) network fabrics
US6275493B1 (en) * 1998-04-02 2001-08-14 Nortel Networks Limited Method and apparatus for caching switched virtual circuits in an ATM network
US6169735B1 (en) * 1998-04-30 2001-01-02 Sbc Technology Resources, Inc. ATM-based distributed virtual tandem switching system
JP3211880B2 (en) * 1998-05-18 2001-09-25 日本電気株式会社 Bandwidth control method
JP3075267B2 (en) * 1998-09-02 2000-08-14 日本電気株式会社 ATM cell buffer read control device and control method
JP3601994B2 (en) * 1998-09-17 2004-12-15 沖電気工業株式会社 ATM cell multiplexing apparatus and ATM cell multiplexing method
US6822961B1 (en) * 1998-10-02 2004-11-23 Nortel Networks Limited Method and apparatus for reduction of call setup rate in an ATM network
US6594265B1 (en) * 1998-11-10 2003-07-15 International Business Machines Corporation Method and system in an asynchronous transfer mode (ATM) network for providing an available bit rate interface to a continuous bit rate virtual path connection with adjustable bandwidth
EP1001574A1 (en) * 1998-11-10 2000-05-17 International Business Machines Corporation Method and system in a packet switching network for dynamically adjusting the bandwidth of a continuous bit rate virtual path connection according to the network load
US6687228B1 (en) * 1998-11-10 2004-02-03 International Business Machines Corporation Method and system in a packet switching network for dynamically sharing the bandwidth of a virtual path connection among different types of connections
US6411617B1 (en) * 1998-12-10 2002-06-25 Nokia Telecommunications, Oy System and method for managing data traffic associated with various quality of service principles using a conventional network node switch
GB9828590D0 (en) * 1998-12-23 1999-02-17 Northern Telecom Ltd Method and apparatus for managing communications traffic
US6963547B1 (en) * 1998-12-29 2005-11-08 Lg Electronics Inc. Local multipoint distribution system and ATM data communication method thereof
US6597689B1 (en) * 1998-12-30 2003-07-22 Nortel Networks Limited SVC signaling system and method
US6549533B1 (en) * 1998-12-30 2003-04-15 Objective Systems Integrators Managing switched virtual circuits in a network
US6771650B1 (en) * 1999-04-19 2004-08-03 Alcatel Canada Inc. Hybrid routed ATM paths
US6707820B1 (en) * 1999-12-16 2004-03-16 Intervoice Limited Partnership Virtual circuit network dynamic channel management
US6266263B1 (en) * 2000-10-02 2001-07-24 Integrated Device Technology, Inc. CAM array with minimum cell size

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6563794B1 (en) * 1998-08-28 2003-05-13 Fujitsu Limited Boundary device for performing a connection control at a boundary between two communications networks
US6631118B1 (en) * 1998-11-10 2003-10-07 At&T Corp. System and method for providing dynamic bandwidth on demand
US7012892B1 (en) * 1999-04-16 2006-03-14 Alcatel Canada Inc. Method and apparatus for supporting connection type partitioning in a communications network
US7864774B2 (en) * 2000-01-18 2011-01-04 Juniper Networks, Inc. ATM connection band control method and control system
US20020089985A1 (en) * 2000-10-27 2002-07-11 Alcatel Access control unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107341058A (en) * 2017-07-13 2017-11-10 郑州云海信息技术有限公司 A kind of its recovery method as resource and device

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