JP3551684B2 - ATM communication system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ATM communication system capable of performing connection processing using a high-speed signaling message.
[0002]
[Prior art]
For example, in an ATM call connection method described in “The ATM Forum Technical Committee” (User-Network Interface (UNI) Specification Version 3.1 (hereinafter referred to as a conventional document), an ATM terminal on the originating side that performs call setting first. Adds an information element to the SETUP message at the start of each communication, and transmits the completed SETUP to each ATM switch on the receiving side. On the other hand, the ATM switch on the receiving side sequentially verifies the information elements included in this SETUP. It adopts the protocol that goes on.
[0003]
After that, the ATM switch on the receiving side notifies the source ATM terminal device that the information element of the transmitted SETUP message is appropriate and various processing such as call admission control and address resolution has been completed. To do so, the receiving ATM exchange returns a CALL PROC message to the originating ATM terminal device, so that all information elements of the preceding SETUP are valid, and the receiving ATM exchange can accept transmission. End the confirmation that there is.
[0004]
FIG. 30 shows a conventional call setting sequence in the ATM call connection system of the above-mentioned conventional document.
In FIG. 30, reference numeral 11 denotes an ATM terminal which has an ATM interface and performs a communication process in accordance with the above-mentioned conventional document mounting protocol. Here, the ATM terminal 11 includes an ATM signaling unit 11a for creating a message for call control and verifying the received message.
[0005]
Reference numeral 12 denotes an ATM switch (ATM switch) which has an ATM interface and performs communication processing in conformity with the above-mentioned conventional document mounting protocol. The ATM switch 12 also creates a message for call control and outputs a received message. An ATM signaling unit 12a for performing verification is provided.
[0006]
The ATM terminal 11 and the ATM terminal switch 12 communicate with each other via the ATM line 13.
[0007]
FIG. 31 is a schematic diagram of a SETUP (call setup request) 100 message which is one of the messages for call control defined in the above-mentioned conventional literature.
[0008]
In FIG. 31, a SETUP 100 includes an ATM cell header 110, a SETUP common unit 120 including a protocol identifier, a call number, a message type, and a message length, and first to third units each including an identifier, a content length, and a content. It is composed of information elements 131 to 133.
[0009]
In the conventional ATM call control system configured as described above, when the ATM terminal 11 is started in order to establish a call / connection to a partner terminal based on a request from a higher-level application, the ATM signaling unit 11a causes the SETUP 200 An ATM cell header 110 and a SETUP common unit 120 are set, and necessary first to third information elements 131 to 133 are set.
[0010]
The first to third information elements 131 to 133 include, for example, a called address that specifies a destination terminal, a broadband transmission capability that indicates network characteristics, an ATM traffic descriptor that specifies traffic parameters, and an AAL (ATM adaptation layer). ), An information element identifier, an information element content length, and an information element content are set for the AAL parameter and the like indicating the characteristics of (1).
[0011]
Then, the ATM signaling section 11a transmits the SETUP 100 thus created to the ATM switch 12 which is physically connected via the ATM line 13.
[0012]
In the ATM switch 12, upon receiving the SETUP 100 transmitted from the ATM terminal 11, the ATM signaling unit 12a checks the validity of the ATM cell header 110, the format of the SETUP common unit 120, and the like, and then checks the first to third information. It verifies the validity of the format of the elements 131 to 133, executes address analysis, call admission control, and the like.
[0013]
More specifically, the ATM signaling unit 12a determines whether the identifier 131a of the first information element 131 is a predefined identifier and can be supported as mandatory or optional in SETUP, and It is checked whether or not the content length 131b of the first information element 131 is within a specified range, and the content 131c of the first information element 131 is determined based on the encoding specified by the identifier 131a of the first information element 131. It is checked whether it is coded and whether the length of the content 131c of the first information element 131 is the same as the content length 131b of the first information element 131.
[0014]
When the identifier 131a of the first information element 131 is a called address, the ATM signaling unit 12a performs an address analysis to identify the partner terminal, and determines whether the identifier 131a of the first information element 131 is an ATM. In the case of a traffic identifier, call admission control is performed to determine whether a value such as a peak cell rate is acceptable to the network. In the case where the identifier 131a of the first information element 131 is an AAL parameter, prescribed coding is performed. Check whether it is.
[0015]
In this manner, when all the checks of the SETUP 100 in the ATM switch 12 are completed and it is determined that the call setup can be accepted, the ATM signaling unit 12a uses the SETUP as a communication partner of the ATM terminal 11 (not shown). Send to the ATM interface of the partner terminal.
[0016]
On the other hand, the ATM signaling section 12a returns a CALL PROC (call setting acceptance) 200 message to the ATM terminal 11 which has transmitted the SETUP 200, thereby confirming that the SETUP 100 has been normally received by the ATM switch 12. Notify the ATM terminal 11.
[0017]
Thereafter, a message of CON (response) 300 is received by the ATM terminal 11 from a partner terminal (not shown) via the ATM switch 12, and the ATM signaling unit 11 a transmits a message of CON ACK (response confirmation) 400 to the ATM switch 12. As a result, the ATM terminal 11 can also communicate the data 500.
[0018]
Thereafter, when the call is released once and a new call setting is performed, the ATM terminal 11 and the ATM switch 12 perform data communication by repeating the above processing in the same manner.
[0019]
[Problems to be solved by the invention]
As described above, in the conventional ATM call setting method, each ATM communication device performs generation of a call control message (for example, SETUP) including an information element and verification of the received call control message for each call control. , The call control process is delayed.
[0020]
The present invention has been made in order to solve such a problem, and an object of the present invention is to provide an ATM communication system capable of performing a connection switching process of a signaling message at a high speed.
[0021]
[Means for Solving the Problems]
An ATM communication system according to the present invention includes first and second ATM devices each provided with an ATM signaling unit for creating a signaling message to be transmitted and verifying the received signaling message. In an ATM communication system for performing communication between a first ATM device and a second ATM device, a label specified in a signaling message and an information element corresponding to the label are registered in association with each other and registered contents are equal to each other. The ATM signaling unit of the first ATM device creates a signaling message by designating the label registered in the correspondence table of the first ATM device in the signaling message when creating the signaling message to be transmitted. , The second ATM device ATM signaling unit of are those that label specified in the signaling message upon validation of the received signaling message so as to confirm whether or not it is registered in the correspondence table of the second ATM device.
[0022]
The ATM signaling unit of the first ATM device includes a label to be registered in the correspondence table of the second ATM device, an information element corresponding to the label, and a registration request notification requesting registration in the correspondence table of the second ATM device. To the second ATM device, and the ATM signaling unit of the second ATM device registers the label and the information element corresponding to the label in the correspondence table of the second ATM device based on the received registration request notification. It is like that.
[0023]
The information element is divided into a set of fixed parts whose contents cannot be changed and a set of variable parts whose contents can be changed.
[0024]
An aggregate of data indicating variable data of a variable portion is further added to the information element.
[0025]
Also, the second ATM device has a timer, and the ATM signaling unit of the second ATM device starts measurement after the call setting process between the first and second ATM devices is completed and determines the predetermined value. If the registration request notification is not received before the time is measured, a registration request notification reminder to urge the first ATM device to output the registration request notification is output to the first ATM device. is there.
[0026]
Further, based on the received registration request notification reminder notification, the ATM signaling unit of the first ATM device does not register the label in the correspondence table of the second ATM device and the information element corresponding to the label. , A non-registration notification indicating that fact is output to the second ATM device.
[0027]
Further, when rejecting the registration of the label and the label in the correspondence table of the second ATM device, the ATM signaling unit of the second ATM device outputs a registration rejection notification indicating that to the first ATM device. It is like that.
[0028]
Further, the ATM signaling unit of the first ATM device is configured to execute a deletion request for requesting deletion of a label to be deleted from the correspondence table of the second ATM device and an information element corresponding to the label from the correspondence table of the second ATM device. The notification is output, and the ATM signaling unit of the second ATM device deletes the label and the information element corresponding to the label from the correspondence table of the second ATM device based on the received deletion request notification. .
[0029]
Further, when the information element is deleted, the ATM signaling section of the second ATM device outputs a deletion confirmation notification indicating the deletion to the originating ATM device.
[0030]
The ATM signaling unit of the first ATM device outputs a change request notification requesting a change of the registered contents registered in the correspondence table of the second ATM device to the second ATM device, and outputs the second ATM device. The ATM signaling section changes the registered contents of the correspondence table of the second ATM device based on the received change request notification.
[0031]
Further, when the registered contents are changed, the ATM signaling section of the second ATM device outputs a change confirmation notification indicating the change to the first ATM device.
[0032]
Further, the ATM signaling section of the second ATM device, when rejecting the change of the registered contents, outputs a change rejection notification indicating that to the first ATM device.
[0033]
The ATM signaling section of the first ATM device indicates the registered contents of the correspondence table of the first ATM device, and the registered contents of the correspondence table of the first ATM device and the registered contents of the correspondence table of the second ATM device. And outputs a registration content confirmation request notification requesting confirmation to the second ATM device. The ATM signaling unit of the second ATM device registers the correspondence table of the first ATM device based on the registration content confirmation request notification. The contents and the registered contents of the correspondence table of the second ATM device are checked.
[0034]
Further, the notification of the registration content confirmation request indicates that the physical disconnection of the line between the first ATM device and the second device is restored, and the ATM signaling units of the first and second ATM devices are connected to each other. This is output when it is confirmed that the connected ATM device is the ATM device connected before the disconnection.
[0035]
Further, the notification of the registration content confirmation request indicates the contents of the correspondence table of the first ATM device by all the labels registered in the correspondence table of the first ATM device.
[0036]
Also, the notification of the registration content confirmation request indicates all the labels registered in the correspondence table of the first ATM device and the contents of the correspondence table of the first ATM device by information elements corresponding to the labels. It is.
[0037]
When the registered contents of the correspondence table of the first ATM device and the registered contents of the correspondence table of the second ATM device do not match, the ATM signaling unit of the second ATM device does not match. The contents are deleted from the correspondence table of the second ATM device, and a registration deletion request notification requesting deletion of non-matching registered contents from the correspondence table of the first ATM device is output. The signaling section deletes the registered contents from the correspondence table of the first ATM device based on the received registration deletion request notification.
[0038]
The notification output from the ATM signaling unit is transmitted via an unallocated channel among the channels in the reserved area other than the user information.
[0039]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a connection processing sequence diagram of the ATM communication system according to the first embodiment.
In FIG. 1, both the ATM terminal 11 and the ATM switch 12 are provided with communication parameter correspondence tables 11b and 12b, which are similarly configured. The communication parameter correspondence tables 11b and 12b will be described later.
The connection processing sequence diagram of the ATM call connection system in FIG. 1 will also be described later.
[0040]
In the ATM call connection system configured as described above, the ATM terminal 11 and the ATM switch 12 are activated to recognize each other that they are physically connected, that is, electrically connected to the line. When it becomes possible to transmit and receive the ATM signaling message, the ATM terminal 11 and the ATM switch 12 perform an operation described later based on an application that has been determined in advance.
[0041]
Here, the predetermined application is, for example, a LAN emulation (hereinafter referred to as LANE) which is a protocol for emulating a LAN, such as a case where a LAN server is connected to a LANE server to participate in the LANE. The address is known, and it is always fixed in what transmission form and how to transmit the data for participation, or how much the peak cell rate and the transfer delay are to be transferred based on the ATM. It refers to an application that does not require the user of the terminal to change the parameters, and is processed based on the same contents every time.
[0042]
When the call is set up, the ATM signaling unit 11a stores in advance a group of first to third information elements 131 to 133, which are information elements of SETUP, which are signaling messages, for convenience of call setting. On the other hand, a certain label number (here, it is assumed that there are three essential information elements) is assigned, and the contents of the information elements are changed in a predetermined manner in the communication between the ATM terminal 11 and the ATM switch 12. It is defined as a specified information element that is information that is not performed, and is associated with both.
[0043]
Then, the ATM signaling unit 11a stores the correspondence between the label number 601 and the specified information element 604, which is the content of the information element, as a communication parameter in the communication parameter correspondence table 11b having the configuration shown in FIG.
[0044]
Then, the ATM signaling unit 11a transmits the correspondence to the ATM switch 12 as the communication parameter registration request notification 700 by using the same channel (value) as the signaling channel for transmitting SETUP in the subsequent call setting request, and It requests the ATM switch 12 to register the correspondence.
[0045]
Here, as shown in FIG. 3, the format of the communication parameter registration request notification 700 includes a communication parameter type 710 for identifying the communication parameter registration request notification and a content length (data length) 720 common to communication parameter messages. As a header part, a label name descriptor 730 for identifying only the specified information element and the previously defined label number 601 are added to this common header part, and subsequently all the information forming the specified information element 604 The first to third information elements 131 to 133 are sequentially added.
[0046]
Also, a communication parameter registration request is used for communication between the ATM terminal 11 and the ATM switch 12 and is distinguished from a message defined in a communication protocol described in the above-mentioned conventional document, that is, a communication parameter value. As for the communication parameter type for identifying a notification or a communication parameter registration confirmation notification, which will be described later, it is necessary to preliminarily define a parameter value not defined in the mutual communication application between them. .
[0047]
Returning to the description, upon receiving the communication parameter registration request notification 700 from the ATM terminal 11, the ATM signaling unit 12a determines from the communication parameter type 710 included in the communication parameter registration request notification 700 that the notification is a communication parameter registration request notification. Then, it is recognized that the specified information element is to be operated from the label name descriptor 730.
[0048]
The regulation information element 604 is composed of first to third information elements 131 to 133, and the ATM signaling unit 12a verifies the validity of the format and the like in the same manner as in the case of the SETUP verification as in the conventional example. If there is no error, the correspondence described in the communication parameter registration request notification 700 is registered as a communication parameter in the communication parameter correspondence table 12b as in the case of the registration processing in the ATM terminal 11.
[0049]
Then, the ATM signaling section 12a notifies the ATM terminal 11 of the completion of the registration by returning the communication parameter registration confirmation notice 800 to the ATM terminal 11.
[0050]
Here, the format of the communication parameter registration confirmation notice 800 is, as shown in FIG. 4, a communication parameter type 810 for identifying the communication parameter registration confirmation notice and a content length (data length) 820 common to communication parameter messages. A header portion is provided, and a label number 601 of data registered in the communication parameter correspondence table 12b is added to the common header portion.
[0051]
By transmitting and receiving the communication parameter registration request notification 700 and the communication parameter registration confirmation notification 800 as described above, both the ATM terminal 11 and the ATM switch 12 register communication parameters, that is, in the signaling message, the specification of the specified information element is An agreement is reached regarding a signaling message in the mutual communication between the ATM terminal 11 and the ATM switch 12 that a label number should be specified.
[0052]
Therefore, when there are a plurality of prescribed information elements to be defined in advance in the communication between the ATM terminal 11 and the ATM switch 12, the above-described registration processing between the ATM terminal 11 and the ATM switch 12 is performed. It may be done repeatedly.
[0053]
When a call setup is actually performed from the ATM terminal 11 to the ATM switch 12, for example, an information element specified by a signaling message between the ATM terminal 11 and the ATM switch 12 is predefined as a communication parameter as described above. If so, based on such registration of the communication parameters, the ATM signaling unit 11a creates a SETUP as will be described later and further makes a call to set up a call.
[0054]
That is, as shown in FIG. 5, in the SETUP 100a in this case, only the specified information element is set as an operation target in a portion corresponding to the first to third information elements 131 to 133 conventionally added in the SETUP 100. The label name descriptor 730 and the label number 601 indicating the contents of the specified information element in the correspondence tables 11b and 12b.
[0055]
Even if a plurality of specified information elements are registered in the communication parameter correspondence table 11b, since the specified information elements are associated with label numbers for identifying each of them, if a label number is specified, any specified rule regarding this call setting can be obtained. It is not unknown whether the information element is added to the message and sent.
[0056]
Then, as shown in FIG. 1, the SETUP 100a thus created is transmitted from the ATM signaling unit 11a to the ATM switch 12.
[0057]
When the ATM switch 12 receives the SETUP 100a, the ATM signaling unit 12a identifies from the label name descriptor 730 that the one added to the SETUP 100a is only the specified information element.
[0058]
Further, since the label number 601 is registered in the communication parameter correspondence table 12b in advance, the ATM signaling unit 12a extracts the corresponding regulation information element from the label number 601 based on the correspondence relation of the communication parameter correspondence table 12b, The validity of this message can be easily verified, and thus, all the information elements of the SETUP 100a can be verified as in the related art.
[0059]
Accordingly, thereafter, the ATM signaling unit 12a transmits a CALL PROC 200 message to the ATM terminal 11 to indicate that the SETUP 100a has been normally received, and the ATM terminal 11 transmits the message to the intended ATM interface of the partner terminal (not shown). Send SETUP.
[0060]
Here, since the communication parameters are not defined between the ATM switch 12 and the partner terminal (not shown), this SETUP transmitted to the partner terminal (not shown) specifies a prescribed information element using the communication parameters. This is not the case, and the format is the SETUP in which all necessary prescribed information elements are specified as in the above-described conventional example.
[0061]
Then, the ATM signaling unit 11a receives the message of CON 300 from the partner terminal (not shown) via the ATM switch 12, and transmits the message of CON ACK 400 to the ATM interface of the ATM switch 12, thereby completing the entire call setup sequence. Then, the data 500 can be transmitted and received.
[0062]
Therefore, according to the first embodiment, when a signaling message is exchanged, a label corresponding to an information element to be added is determined based on the exchanged communication parameter correspondence table in advance and is added to the signaling message. Means that the message creation processing is reduced, while the receiving device is reduced in the inspection during the reception processing of the signaling message, and the message length is shortened and the transfer delay is also reduced, so that the call setup delay is greatly reduced. Can be.
[0063]
In the above description, the application to be started was apparent in advance. For example, in order to output to the printer while working on the window of the personal computer, call setting is started as in the case of newly starting the application. At this time, an information element to be added to SETUP may be determined.
[0064]
In this case, parameters such as a called address and a peak cell rate are newly set, and the ATM signaling unit creates a SETUP based on the parameters. Actual communication is started immediately after setting these parameters. Not necessarily.
[0065]
That is, there is a slight time difference between the intentional operation of the user and the end of the parameter setting screen and the actual start of communication. The processing in this case is performed in accordance with the sequence of FIG. 1 similarly to the above, but the timing of transmitting the communication parameter registration request notification is immediately before the start of this new application.
[0066]
Embodiment 2 FIG.
In the first embodiment, the communication parameter setting registration is performed between the ATM terminal 11 and the ATM switch 12 immediately before the application starts, but such communication parameter setting registration is performed immediately before the application starts. On the contrary, there is a case where a delay occurs in call setting.
[0067]
Therefore, for example, a message for confirming the connectivity with the partner after the communication is started, for example, by directly inputting a command such as ping which is a command for confirming the communication state used in the TCT / IP protocol, Communication parameters may be set and registered.
[0068]
Next, the second embodiment will be described with reference to the sequence diagram of FIG. 6. First, call setting is performed according to the setting procedure shown in the above-mentioned conventional example. During the call setting process, if the ATM terminal 11 has received at least the CALL PROC 200 indicating that the reception of the SETUP 100 has been confirmed, the ATM signaling unit 11a sets the timing at which the call setting and the data communication are not hindered. In the same manner as in the first embodiment, the control information setting unit 11 sets the specified information element in the communication parameter correspondence table 11a in advance, and transmits a communication parameter registration request notification 700 to the ATM switch 12.
[0069]
Upon receiving the communication parameter registration request notification 700, the ATM signaling unit 12a registers the specified information element and the label name in the communication parameter correspondence table 12b in association with each other as communication parameters, and performs communication, as in the first embodiment. A parameter registration confirmation notice 800 is transmitted to the ATM terminal 11.
[0070]
Therefore, according to the second embodiment, the initial call setup delay is the same as the conventional one, but it corresponds to an information element to be added based on the exchanged communication parameter correspondence table in the subsequent exchange of signaling messages. By determining the label and adding the label to the signaling message, the transmitting device can reduce the message creation process, while the receiving device can reduce the inspection at the time of the signaling message reception process and further reduce the message length. As a result, the transfer delay is also reduced, so that the call setup delay can be greatly reduced.
[0071]
Embodiment 3 FIG.
For example, in the first and second embodiments, for example, in the information element added to SETUP, for example, when the LANE server is changed during communication, the information element is partially changed so as to be able to respond to the change flexibly. It may be desired to change only part of the called address that is part of it later.
[0072]
On the other hand, for example, only the peak cell rate part of the ATM traffic descriptor which partially constitutes the information element is added to the information elements added to the SETUP, for example, in order to cope with a case where an image is transmitted in addition to data. Sometimes you want to change.
[0073]
Therefore, in the former case, the information elements set in advance in the communication parameter correspondence tables 11b and 12b are fixed information element parts whose contents are never changed later, and in some cases the contents are changed later. In addition, in the latter case, it is possible to change the above-mentioned specified information element and a part of the data in the specified information element, and in some cases, change the data later. Each of these is constituted by a possible newly added variation parameter.
That is, in the latter case, an information element is newly configured by newly adding a variable parameter that can be changed in content, which forms a part of the specified information element, to the specified information element.
[0074]
Then, the part of the information element that can be changed later is previously set as a variable information element whose information content can be changed in the former case, and as a variable parameter whose information content can be changed in the latter case. What is necessary is just to define and register in each table, and to change those parts later, if it becomes necessary.
[0075]
In the third embodiment, for example, call setting is performed by assuming that a change in the called address portion or the peak cell rate portion of the ATM traffic descriptor is changed. Steps will be described, and a case will be described where target data is changed in a SETUP message as described later.
[0076]
The formats of the communication parameter registration request notifications 700a and 700b at the initial setting stage adopt the formats shown in FIGS. 7 and 8, respectively.
[0077]
That is, in the former case, as shown in FIG. 7, the communication parameter type 710 identifying the communication parameter registration request notification 700a and its content length 720 are used as a common header part of the communication parameter message, and this common A label name descriptor 730 and a label number 601 for identifying that an information element composed of a fixed information element and a variable information element are to be operated are added to a header part, and subsequently all information of the fixed information element is added. The configuration is such that first and second information elements 131 and 132 and third and fourth information elements 133 and 134, which are all information of the variable information element, are sequentially added.
[0078]
In the latter case, as shown in FIG. 8, the communication parameter type 710 for identifying the communication parameter registration request notification 700b and its total content length 720 are used as a common header part of the communication parameter message. A label name descriptor 730 and a label number 601 are added to the common header part to identify that an information element composed of a specified information element and a variable parameter which is a part of data in the specified information element is to be registered. Further, all the information of the variation parameters that may be changed in the first and second information elements 131 and 132 and the first and second information elements 131 and 132, which are all the information of the prescribed information element. The first and second variation parameters 131ca to 131cc and 132ca to 132cc are sequentially added.
[0079]
Further, in the former case, the first and second information elements 131 and 132, which are all information of the fixed information element, are so arranged that the fixed information element and the variable information element can be easily identified in the format. A fixed information element descriptor 741 and a fixed information element content length 742 indicating the content length are set beforehand, and similarly, the variable information is placed before the third and fourth information elements 133 and 134 which are all information of the variable information element. An element descriptor 743 and a variable information element content length 744 indicating the content length are set.
[0080]
On the other hand, in the latter case, the first and second information elements 131 and 132, which are all information of the information element, are placed before the specified information element and the variation parameter in the format so that the parameter can be easily identified. A specified information element descriptor 745 and a specified information element content length 746 indicating the content length are set, and similarly, before the first and second variable parameters 131ca to 131cc and 132ca to 132cc, which are all information of the variable parameters, A parameter descriptor 747 and a variable parameter content length 748 indicating the content length are set.
[0081]
Then, as in the case of the first and second embodiments, the ATM signaling section 11a associates the information element composed of the fixed information element and the variable information element or the information element composed of the prescribed information element and the variable parameter with the label number, and The communication parameters are registered as communication parameters in the communication parameter correspondence table 11a, and the communication parameter registration request notifications 700a and 700b according to such a format are transmitted to the ATM switch 12 to request the communication parameter correspondence table 12b to register these correspondences. It has become.
[0082]
On the other hand, the ATM switch 12 that has received the communication parameter registration request notifications 700a and 700b associates the label numbers 601a and 601b with the information elements according to the common header part of the communication parameter registration request notifications 700a and 700b, and makes the communication parameter correspondence table. As shown in FIG. 9, the user himself / herself is registered in 12b.
[0083]
Then, when the communication between the ATM terminal 11 and the ATM switch 12 is terminated and the communication is resumed, if it is necessary to change the variable information element, the SETUP for re-establishing the call when the communication is resumed is performed. In the data change, a SETUP adopting a configuration as shown in FIG. 10 in the former case and a configuration as shown in FIG. 11 in the latter case may be used.
[0084]
That is, the format of the SETUP is such that, in a portion corresponding to the information element of the message of the SETUP 100 of the conventional example, a label name descriptor 730 for identifying the type of the target information element, and in the former case, As shown in FIG. 10, a label number 601a indicating which data in the communication parameter correspondence table corresponds to the third and fourth information elements 133 and 134, which are new contents of the variable information element to be changed. On the other hand, in the latter case, the label number 601b indicating which data in the communication parameter correspondence table corresponds to the data, the identifier 131ca of the variable parameter 1 to be changed, and the identifier 131ca as shown in FIG. The content 131cb, the identifier 132aa of the variation parameter 2 and the content 132ca are added. .
[0085]
As described above, regarding the information element portions in the message, in the former case, for example, taking the third information element 133 as an example, as shown in FIG. The identifier 133a of the third information element 133, the content length 133b of the third information element 133, and the content 133c of the third information element 133. On the other hand, in the latter case, for example, the variation parameter 1 is used. In this case, as shown in FIG. 11, the fluctuation parameter 1 which forms a part of the third information element 131 which is a prescribed information element is composed of the identifier 131ca of the fluctuation parameter 1 and the content 131cc of the fluctuation parameter 1, respectively.
[0086]
It should be noted that the label name descriptor 730 for identifying the type of the target information element in SETUP 100b or 100c as shown in FIG. 10 or FIG. 11 is specified in the former case in SETUP 100b or 100c. The correspondence between the designated label numbers 601a and 601b and the label numbers 601a and 601b in the communication parameter correspondence table 12b makes it clear that the fixed information element or the specified information element of the target data is clear, and it is not necessary to specify them. It is.
[0087]
Further, in the latter case, the SETUP 100c does not specify the identifier for identifying the variable parameter, but directly specifies the partial parameter identifier and the partial parameter content, which are the parameters forming the variable parameter. By setting the identifiers and contents of the partial parameters 1 and 2 in the SETUP 100c in the order of the variable parameters 1 and 2 specified by the communication parameter registration request notification 700b, the correspondence between the ATM terminal 11 and the ATM switch 12 is determined. This is because the information amount included in SETUP 100c can be further reduced.
[0088]
Returning to the description, after receiving the SETUP 100b and 100c, the ATM signaling unit 12a determines that the target data includes the fixed information element and the variable information element from the label name descriptor 730, or Recognize that parameters are included.
[0089]
Since the label numbers 601a and 601b are registered in the communication parameter correspondence table 12b, the ATM signaling unit 12a newly changes and specifies the variable information element of the corresponding data in the communication parameter correspondence table 12b. Change to a variable information element, or change the corresponding part of the specified information element of the corresponding data to a newly specified variable parameter, verify the data validity of the new SETUP 100b, 100c, and perform normal SETUP. By performing the same processing as that in the case of receiving, all the information elements of SETUP can be verified.
[0090]
Therefore, according to the third embodiment, when a signaling message is exchanged, a label corresponding to an information element to be added is determined based on the exchanged communication parameter correspondence table in advance, and the determined label is added to the signaling message. By enabling the registration in advance, it is possible to construct a flexible ATM system, and the transmitting device can reduce the message creation processing, while the receiving device can reduce the inspection at the time of receiving the signaling message. In addition, since the message length is shortened and the transfer delay is reduced, the call setup delay can be greatly reduced.
[0091]
Embodiment 4 FIG.
For example, in the third embodiment, the communication parameters are changed in SETUP 100b and 100c when the call is set again. However, depending on the situation, the ATM terminal may be changed before the call is set again or after the call is set. Generally, during the normal communication between the ATM switch 11 and the ATM switch 12, it is necessary to change the above-mentioned variable information elements and the above-mentioned variable parameters.
[0092]
Therefore, in the fourth embodiment, a case where data is changed at a stage other than the call setting will be described.
In this case, the ATM signaling unit 11a transmits to the ATM switch 12 a communication parameter change request specifying a variable information element or a variable parameter to be changed.
[0093]
The format of the communication parameter change request is as shown in FIG. 12 or FIG. 13, that is, in the case of the former described in the third embodiment, as shown in FIG. The communication parameter type 710 to be identified and the total content length 720 are used as a common header part of the communication parameter change request message, and the information element composed of the fixed information element and the variable information element is used as an operation target in this common header part. A label name descriptor 730 and a label number 601 are added, and subsequently, the first and second information elements 131 and 132, which are all information of fixed information elements, and the second information, which is all information of variable information elements. The third and fourth information elements 133 and 134 are sequentially added.
[0094]
In the latter case described in the third embodiment, as shown in FIG. 13, a communication parameter type 710 for identifying the communication parameter change request notification 800b, its total content length (data length) 720, and Is the common header part of the communication parameter change request message, and this common header part identifies that the specified information element and the information element composed of the variable parameter which is a part of the data in the specified information element are to be operated. The label name descriptor 730 and the label number 601 to be added are added, and subsequently, the first and second information elements 131 and 132 and the first and second information elements 131 and 132, which are all information of the specified information element, are added. The first and second fluctuation parameters 131ca to 131cc and 132ca to 132cc, which are all information of the fluctuation parameters that may be changed by It has a configuration in which added to.
[0095]
In the former case, the first and second information elements 131 and 132, which are all information of the fixed information element, are so arranged that the fixed information element and the variable information element can be easily identified in the format. A fixed information element descriptor 741 and a fixed information element content length 742 indicating the content length are set beforehand, and similarly, the variable information is placed before the third and fourth information elements 133 and 134 which are all information of the variable information element. An element descriptor 743 and a variable information element content length 744 indicating the content length are set.
[0096]
On the other hand, in the latter case, the first and second information elements 131 and 132, which are all information of the information element, are placed before the specified information element and the variation parameter in the format so that the parameter can be easily identified. A specified information element descriptor 745 and a specified information element content length 746 indicating the content length are set, and similarly, before the first and second variable parameters 131ca to 131cc and 132ca to 132cc, which are all information of the variable parameters, A parameter descriptor 747 and a variable parameter content length 748 indicating the content length are set.
[0097]
For example, when it is necessary to change the data as described above during the communication between the ATM terminal 11 and the ATM switch 12, as shown in FIG. 14, the ATM signaling unit 11a transmits the communication parameter according to the format described above. The change request notice 800a or 800b is created and output to the ATM switch 12, and the registered contents of the communication parameter correspondence table 11b are searched based on the label number 601 to change the corresponding part.
[0098]
On the other hand, when the ATM switch 12 receives the communication parameter change request notification 800a or 800b from the ATM terminal 11, the ATM signaling unit 11a identifies the communication parameter change request notification 800a or 800b from the communication parameter type 710, and The type of data to be operated is identified from the descriptor 720.
[0099]
Then, the ATM signaling unit 12a verifies the validity of the format and the like as in the case of the above-described SETUP verification, and further, if necessary, the contents related to other information elements in the communication parameter correspondence table 12b. The verification is performed in combination with the registered contents of the corresponding label number, and if there is no error, the corresponding contents are changed in the communication parameter correspondence table 12b in the same manner as the change processing in the ATM terminal 11.
[0100]
Further, in order to indicate this registration confirmation to the ATM terminal 11, the ATM signaling unit 11a creates a communication parameter change confirmation notice 900 and returns it to the ATM terminal 11 as shown in FIG. In the tables 11b and 12b, the target data is changed.
[0101]
Here, the format of the communication parameter change confirmation notification 900 is, as shown in FIG. 15, a communication parameter type 810 for identifying the communication parameter change confirmation notification 900 and its entire content length 820, and a common header part of the communication parameter message. The label number 601 of the data that has been changed in the communication parameter correspondence table 12b is specified in the common header section.
[0102]
Therefore, according to the fourth embodiment, at the time of signaling message exchange, the label corresponding to the information element to be added is determined based on the exchanged communication parameter correspondence table in advance and is added to the signaling message. By making the contents of the correspondence table changeable, a flexible ATM communication system can be constructed.
[0103]
Embodiment 5 FIG.
Even if SETUP is transmitted from the ATM terminal 11 to the ATM switch 12, CON is returned from the ATM switch 12 to the ATM terminal 11, and communication is started between the two, a communication parameter registration request is transmitted from the ATM terminal 11 all the way. In this case, the ATM switch 12 may prompt the ATM terminal 11 to transmit a communication parameter registration request.
[0104]
As shown in FIG. 16, a timer 12c is further provided inside the ATM switch 12 on the receiving side of the SETUP, and after transmitting the CON to the ATM terminal 11 on the starting side where the ATM signaling section 12a has set up the call, The ATM signaling unit 12a starts the communication parameter registration start request notice 1000 for prompting the ATM terminal 11 to transmit a communication parameter registration request after the timer 12c is activated and the timer 12c times out.
[0105]
Here, as shown in FIG. 18, the format of the communication parameter registration start request notification 1000 includes a communication parameter type 810 for identifying the communication parameter registration start request notification and its total content length 820 as a common header of the communication parameter message. And a call number 1010 for identifying a call for inquiring of communication parameter registration is added to the common header section.
[0106]
Then, the ATM signaling section 11a receives the communication parameter registration start request notification 1000 from the ATM switch 12, and, if the communication parameter is to be registered, creates the communication parameter registration request as described above and creates the ATM switch 12 as described above. To perform communication parameter registration processing as described above.
[0107]
On the other hand, if the ATM signaling unit 11a does not intend to register the communication parameter in response to the communication parameter registration activation request notification 1000 from the ATM switch 12, the ATM signaling unit 11a creates a communication parameter non-registration notification 1100 as shown in FIG. To the ATM switch 12 to notify the ATM terminal 11 that communication parameter registration will not be performed.
[0108]
Here, as shown in FIG. 19, the format of the communication parameter non-registration notification 1100 is the communication parameter type 810 identifying the communication parameter non-registration notification and the entire contents thereof, as in the communication parameter registration activation request notification 1000. The length (data length) 820 is used as a common header portion of the communication parameter message, and a call number 1010 corresponding to the call for which the communication parameter activation is inquired is added to the common header portion.
[0109]
Therefore, at this stage, it is clear that the communication parameter correspondence tables 11a and 12a are not set in both the ATM terminal 11 and the ATM switch 12. However, the ATM switch 12 that has received the communication parameter non-registration notification 1100 further confirms it. May send a communication parameter non-registration notification confirmation notification 1200 to the ATM terminal 11.
[0110]
Here, the format of the communication parameter non-registration confirmation notification 1200 is, like the communication parameter registration start request notification 1000 and the communication parameter non-registration notification 1100, as shown in FIG. The communication parameter type 810 and its total content length (data length) 820 are used as a common header part of the communication parameter message, and the call number 1010 corresponding to the call that received this notification without registering the communication parameter in this common header part. Is added.
[0111]
Therefore, according to the fifth embodiment, at the time of exchanging signaling messages, a label corresponding to an information element to be added is determined based on the exchanged communication parameter correspondence table in advance, and prompting to add the label to the signaling message is provided. The subsequent transmitting device reduces the message creation processing, while the receiving device reduces the checking during the reception processing of the signaling message, and further reduces the message length and the transfer delay, thereby reducing the call setup delay. Can be greatly reduced.
[0112]
Embodiment 6 FIG.
For example, in the above-described embodiment, in the contents of the communication parameter registration request or the communication parameter change request, there was some error or rejection factor due to an error in the code specified by the application to be used or a rejection of call admission control. In this case, the ATM switch 12 returns a response rejecting registration or change of communication parameters (change is also considered as a form of registration), that is, a communication parameter registration rejection response, and reports that the registration or change of communication parameters has failed. 11 may be notified.
[0113]
Here, as shown in FIG. 21, the format of the communication parameter registration rejection response notification 1300 described above is a communication parameter type 810 for identifying the communication parameter registration rejection response notification 1300, and the total content length (data length) thereof. 820 is added as a common header part of the communication parameter message, and a label number 1310 corresponding to the invalid communication parameter registration request notice 800 and a predetermined cause value 1320a indicating the cause of the error for each error are added to the common header part. And a combination with a predetermined diagnostic code 1320b.
[0114]
The ATM signaling unit 11a that has received the communication parameter registration rejection response notification 1300 corrects the corresponding message based on the combination of the cause value 1320a and the diagnostic code 1320b, and further corrects the communication parameter registration request or communication. By resending the parameter change request to the ATM switch 12, registration or change of the communication parameter may be tried again. Subsequent processing is the same as in the above-described embodiment, and a description thereof will be omitted.
[0115]
Then, the number of times that the ATM signaling unit 11a retransmits the message modified based on the communication parameter registration rejection response notification 1300 to the ATM switch 12 exceeds the predetermined number of retransmissions. If 11a gives up such an attempt again, the ATM signaling unit 11a returns the data registered or changed in the communication parameter correspondence table 11a to the state before registration or change, and the ATM signaling unit 11a stores the data in the communication parameter correspondence tables 11b and 12b. Both registered contents may be matched.
[0116]
Therefore, according to the sixth embodiment, the reliability of the conventional ATM communication system can be reduced without impairing the processing functions such as the call admission control by exchanging the signaling message by reliably performing the check of the information element to be registered. A label corresponding to an information element to be added can be determined based on a communication parameter correspondence table that has been exchanged in advance.
[0117]
Embodiment 7 FIG.
In the above-described embodiment, the processing for newly registering or changing data in the communication parameter correspondence tables 11b and 12b has been mainly described. In the seventh embodiment, the processing for deleting data from the communication parameter correspondence tables 11b and 12b will be described. I do.
[0118]
When deleting data from the communication parameter correspondence tables 11b and 12b, the ATM signaling unit 11a creates a communication parameter registration deletion request notification 1400 and transmits it to the ATM switch 12.
[0119]
Here, as shown in FIG. 22, the format of the communication parameter registration deletion request notification 1400 includes a communication parameter type 810 for identifying the communication parameter registration deletion request notification and a total content length (data length) 820 of the communication parameter. The message is added as a common header part of the message, and the label number 601 of the data whose registration is to be deleted from the table is added to the common header part.
[0120]
If there are a plurality of data whose registration is to be deleted in the communication parameter correspondence tables 11b and 12b, the communication parameter registration deletion request notification 1400 sets a plurality of target data label numbers.
[0121]
Further, when deleting the registration of all data in the communication parameter correspondence tables 11b and 12b, the communication parameter registration deletion request notification 1400 sets all the label numbers of the target data or deletes all the data. A predetermined special code indicating the request may be set instead of the label number.
[0122]
When it becomes necessary to delete such data, the ATM signaling unit 11a creates a communication parameter registration deletion request notification 1400 according to the format described above, outputs the notification 1400 to the ATM switch 12, and generates a communication parameter correspondence table. 11b is searched for (specified) based on the label number 601.
[0123]
On the other hand, when the ATM switch 12 receives the communication parameter registration deletion request notification 1400 from the ATM terminal 11, the ATM signaling unit 12a identifies the communication parameter deletion request notification 1400 from the communication parameter type 810, and verifies the SETUP described above. The validity of the format and the like are verified as in the case of (1).
[0124]
Further, as in the case of the registration deletion processing in the ATM terminal 11, the ATM signaling section 12a searches for data to be deregistered from the label number, and stores the corresponding data in the communication parameter correspondence table. 12b.
[0125]
Further, the ATM signaling section 12a transmits a communication parameter registration deletion confirmation notice 1500 to the ATM terminal 11 to notify the ATM terminal 11 of the confirmation of the registration deletion of the target data.
[0126]
Here, the format of the communication parameter registration deletion confirmation notice 1500 is, as shown in FIG. 23, a communication parameter type 810 for identifying the communication parameter registration deletion confirmation notice 1500 and a total content length (data length) 820 thereof. It is a common header part of the parameter message, and is composed of the same label number 601 as the label number requested to delete the registration of the communication parameter in this common header part.
[0127]
Then, the ATM signaling unit 11a of the ATM terminal 11, which has received the communication parameter registration deletion confirmation notice 1500, deletes the registration of the target data from the communication parameter correspondence table 11b.
[0128]
As described above, the timing of deleting the target data from the communication parameter correspondence tables 11a and 12a is when the communication parameter registration deletion request notification 1400 is received in the communication parameter correspondence table 12a, and the communication parameter registration deletion is performed in the communication parameter correspondence table 11a. By performing each when the confirmation notice 1500 is received, the consistency of data registration deletion is confirmed in both tables.
[0129]
Therefore, according to the seventh embodiment, it is possible to effectively use the resources of the ATM device by deleting the information of the communication parameter correspondence table that is no longer needed.
[0130]
Embodiment 8 FIG.
Even when each ATM communication device is physically disconnected due to a power failure or disconnection of the line, and then restored, the ATM terminal 11 and the ATM switch 12 that have been connected before that time are authenticated by, for example, ATM. If the confirmation is performed using a forum ILMI procedure or the like and the confirmation is obtained, the registered contents of the communication parameter correspondence tables 11b and 12b are regarded as unchanged from before the failure, and the communication parameter correspondence tables 11b and 12b are used for the subsequent call setting. A high-speed call setting can be performed by using the registered contents of.
[0131]
This is based on the premise that the registered contents of the communication parameter correspondence tables 11b and 12b have not been destroyed by each ATM communication device. Therefore, the registered contents of the database, that is, the registered contents of the tables 11b and 12b may be made consistent after restoration.
[0132]
FIG. 24 shows a sequence in the case where a registration content confirmation notification (hereinafter, referred to as a database notification) after recovery from a failure is transmitted from the ATM terminal 11. Conversely, FIG. 24 shows a sequence in which the database notification is transmitted from the ATM switch 12 first. Each of the sequences when output is performed is shown.
[0133]
This confirmation may be started from either side of the ATM terminal 11 or the ATM switch 12, or may be started at the same time. Here, the case where the ATM terminal 11 starts first (the case of FIG. 24) It is shown below.
[0134]
When the power is restored from the power failure, in the ATM terminal 11, the ATM signaling unit 11a creates a database notification 1600, and the database notification is transmitted from the ATM terminal 11 to the ATM switch 12.
[0135]
Here, the database notification is obtained by sequentially arranging the registered contents of the communication parameter correspondence table 11b. 26 or 27 is used as the format of the database notification 1600.
[0136]
In the format 1600a shown in FIG. 26, a communication parameter type 810 for identifying a database notification indicating only a label number and its total content length 820 are added as a common header part of a communication parameter message. The label number 601 indicated by the registered contents of the communication parameter correspondence table 11b registered as a database is set in order.
[0137]
In a format 1600b shown in FIG. 27, a communication parameter type 810 for identifying a database notification indicating all registration information and its total content length 820 are added as a common header part of the communication parameter message. The label number 601 indicated by the registered contents of the communication parameter correspondence table 11b registered as a database, the content length 1600a of the data corresponding to the label number, and all information (contents) of the data corresponding to the label number 1600b and the like.
[0138]
Then, in the ATM switch 12 that has received the database notification 1600, the ATM signaling unit 12a checks the content of the ATM switch 12 against the content of the communication parameter correspondence table 12b of the ATM switch 12.
[0139]
When the collation is confirmed, the ATM signaling unit 12a creates a data collation confirmation notice (hereinafter, referred to as a database notification confirmation notice) 1700, and the database notification confirmation notice 1700 is transmitted from the ATM switch 12 to the ATM terminal 11. And sends the confirmation to the ATM terminal 11.
[0140]
Here, as shown in FIG. 28, the format of the database notification confirmation notification 1700 is a communication parameter type 810 for identifying the database notification confirmation notification 1700 and its total content length 820 as a common header part of the communication parameter message. It is composed.
[0141]
Conversely, if the collation of the registered contents in the communication parameter correspondence table 12b does not match, it is determined that there is an error, that is, the registered contents are destroyed, as shown in FIG. By transmitting a communication parameter registration deletion request notification 1800 indicating that the registration information has been deleted, the receiving side returns a communication parameter registration deletion confirmation notification 1900 as an acknowledgment, thereby allowing an invalid entry to correspond to the communication parameter. You may make it delete from table 11b, 12b.
[0142]
The communication parameter registration deletion request and the communication parameter registration deletion confirmation are the same as in the above-described embodiment.
[0143]
The sequence when the database notification 1600 is output first from the ATM switch 12 is as shown in FIG. 25. The process in this case is the same as the case where the database notification 1600 is output from the ATM terminal 11. .
[0144]
When the ATM terminal 11 and the ATM switch 12 simultaneously output the database notification 1600 to perform processing, the ATM terminal 11 and the ATM switch 12 independently perform the above-described data collation based on the received database notification. If there is no error in any device, it can be confirmed that the data collation is completed by not returning any response.
[0145]
Therefore, according to the eighth embodiment, when a signaling message is exchanged, a label corresponding to an information element to be added is determined based on the exchanged communication parameter correspondence table in advance and is added to the signaling message. Means that the message creation processing is reduced, while the receiving device is reduced in the inspection during the reception processing of the signaling message, and the message length is shortened and the transfer delay is also reduced, so that the call setup delay is greatly reduced. Can be.
[0146]
Embodiment 9 FIG.
In the above-described embodiment, SETUP is described as an example of a communication parameter registration target message. However, the present invention may be applied to other signaling messages such as an ADD message having a relatively large number of information elements. In this way, the speed of various signaling processes is increased.
[0147]
Embodiment 10 FIG.
In addition, the communication parameter message is transferred on the normal signaling channel. However, in order to clearly show that the message is different from the message of the ATM forum UNI signaling and to simplify the processing, the channel of the reserved area other than the user information is used. A similar effect can be obtained even if the transfer is performed by out-band signaling using an unallocated channel.
[0148]
Embodiment 11 FIG.
In the above-described embodiment, the communication parameter correspondence tables 11b and 12b are created by exchanging signaling messages. However, these tables may be created by manually setting in advance, A high-speed signaling process can also be realized by taking out a necessary entry at the time of creation, setting a corresponding label or information element, and transmitting a message.
[0149]
Embodiment 12 FIG.
Further, in the above-described embodiment, even when at least some of the information elements and the like of each entry of the communication parameter correspondence tables 11b and 12b can be determined by another protocol, they are set in the communication parameter correspondence table in advance. Other necessary information elements may be determined using a communication parameter registration change procedure as shown in FIG.
[0150]
For example, by acquiring a routing table to the destination terminal by the PNNI routing protocol, it is possible to obtain routing information to the destination terminal apparent from the called address before the call setup.
[0151]
Embodiment 13 FIG.
Further, in the above-described embodiment, even after the above-mentioned communication between the ATM terminal 11 and the ATM switch 12 has been completed and the call has been released, the communication parameters registered by the respective ATM communication devices respectively. If the contents of the correspondence tables 11b and 12b are not deleted but are used for the subsequent call setting using the same information element contents, high-speed call setting can be executed.
[0152]
In the above-described embodiment, it is assumed that the ATM terminal 11 activates the call setting (originating first), and the communication parameter message is activated on the ATM terminal 11 side. Since the ATM switch 12 activates the call setting on the called terminal side, which is the other party terminal that does not perform communication, when setting communication parameters between the ATM switch 12 and the other party terminal (not shown), a communication parameter message Becomes the ATM switch 12.
[0153]
【The invention's effect】
According to the present invention, each of the first and second ATM devices is provided with an ATM signaling unit for creating a signaling message to be transmitted and verifying the received signaling message, and performs communication between the two based on the signaling message. The first and second ATM devices each have a correspondence table in which the label specified in the signaling message and the corresponding information element are registered in association with each other and the registered contents are equal to each other. When creating the signaling message to be transmitted, the ATM signaling unit of the first ATM device specifies the label registered in the correspondence table of the first ATM device in the signaling message, creates the signaling message, and creates the second signaling message. ATM signal of ATM equipment The verification unit checks whether the label specified in the signaling message is registered in the correspondence table of the second ATM device when verifying the received signaling message. An ATM communication system capable of performing processing at high speed can be obtained.
[0154]
The ATM signaling unit of the first ATM device includes a label to be registered in the correspondence table of the second ATM device, an information element corresponding to the label, and a registration request notification requesting registration in the correspondence table of the second ATM device. To the second ATM device, and the ATM signaling unit of the second ATM device registers the label and the information element corresponding to the label in the correspondence table of the second ATM device based on the received registration request notification. Thus, it is possible to obtain an ATM communication system capable of performing a connection switching process of a signaling message at a high speed.
[0155]
Also, since the information elements are divided into a set of fixed parts whose contents cannot be changed and a set of variable parts whose contents can be changed, an ATM communication system capable of performing a connection switching process of a signaling message at a high speed. Can be obtained.
[0156]
Further, since an aggregate of data indicating the variable data of the variable portion is further attached to the information element, it is possible to obtain an ATM communication system capable of performing a connection switching process of a signaling message at a high speed.
[0157]
Also, the second ATM device has a timer, and the ATM signaling unit of the second ATM device starts measurement after the call setting process between the first and second ATM devices is completed and determines the predetermined value. When the registration request notification is not received before the measured time is measured, a registration request notification dunning notification for dunning the output of the registration request notification to the first ATM device is output to the first ATM device. It is possible to obtain an ATM communication system capable of performing a connection switching process of a signaling message at a high speed.
[0158]
Further, based on the received registration request notification reminder notification, the ATM signaling unit of the first ATM device does not register the label in the correspondence table of the second ATM device and the information element corresponding to the label. Since the non-registration notification indicating that fact is output to the second ATM device, the range of selection of the ATM device is expanded and a flexible ATM communication system can be obtained.
[0159]
Further, when rejecting the registration of the label and the label in the correspondence table of the second ATM device, the ATM signaling unit of the second ATM device outputs a registration rejection notification indicating that to the first ATM device. As a result, it is possible to obtain an ATM communication system that does not impair the conventional functions.
[0160]
Further, the ATM signaling unit of the first ATM device is configured to execute a deletion request for requesting deletion of a label to be deleted from the correspondence table of the second ATM device and an information element corresponding to the label from the correspondence table of the second ATM device. The notification is output, and the ATM signaling unit of the second ATM device deletes the label and the information element corresponding to the label from the correspondence table of the second ATM device based on the received deletion request notification. Can be used effectively.
[0161]
In addition, when the information element is deleted, the ATM signaling unit of the second ATM device outputs a deletion confirmation notification indicating the fact to the originating ATM device, thereby enabling effective use of resources. .
[0162]
The ATM signaling unit of the first ATM device outputs a change request notification requesting a change of the registered contents registered in the correspondence table of the second ATM device to the second ATM device, and outputs the second ATM device. The ATM signaling unit changes the registered contents of the correspondence table of the second ATM device based on the received change request notification, so that it is possible to obtain a flexible ATM communication system in which the range of selection of signaling message information is expanded. Can be.
[0163]
Further, when the registration content is changed, the ATM signaling unit of the second ATM device outputs a change confirmation notification indicating the change to the first ATM device. A flexible ATM communication system with a wide range can be obtained.
[0164]
Further, when rejecting the change of the registered contents, the ATM signaling unit of the second ATM device outputs a change rejection notice indicating the change to the first ATM device, so that the conventional function is impaired. , An ATM communication system free of the problem can be obtained.
[0165]
The ATM signaling section of the first ATM device indicates the registered contents of the correspondence table of the first ATM device, and the registered contents of the correspondence table of the first ATM device and the registered contents of the correspondence table of the second ATM device. And outputs a registration content confirmation request notification requesting confirmation to the second ATM device. The ATM signaling unit of the second ATM device registers the correspondence table of the first ATM device based on the registration content confirmation request notification. Since the contents and the registration contents of the correspondence table of the second ATM device are checked, it is possible to obtain an ATM communication system capable of performing a connection switching process of a signaling message at a high speed.
[0166]
Further, the notification of the registration content confirmation request indicates that the physical disconnection of the line between the first ATM device and the second device is restored, and the ATM signaling units of the first and second ATM devices are connected to each other. An ATM communication system capable of performing a connection switching process of a signaling message at a high speed because the output is performed when it is confirmed that the connected ATM device is the ATM device connected before the disconnection. Obtainable.
[0167]
In addition, since the registration content confirmation request notification indicates the contents of the correspondence table of the first ATM device by all the labels registered in the correspondence table of the first ATM device, the reliability of the ATM communication system is improved. At the same time, it is possible to obtain an ATM communication system that can perform a connection switching process of a signaling message at high speed.
[0168]
In addition, the notification of the registration content confirmation request indicates the contents of the correspondence table of the first ATM device by all the labels registered in the correspondence table of the first ATM device and the information elements corresponding to the labels. Thus, it is possible to obtain an ATM communication system capable of improving the reliability of the ATM communication system and performing a connection switching process of a signaling message at a high speed.
[0169]
When the registered contents of the correspondence table of the first ATM device and the registered contents of the correspondence table of the second ATM device do not match, the ATM signaling unit of the second ATM device does not match. The contents are deleted from the correspondence table of the second ATM device, and a registration deletion request notification requesting deletion of non-matching registered contents from the correspondence table of the first ATM device is output. The signaling unit deletes the registration content from the correspondence table of the first ATM device based on the received registration deletion request notification, so that the reliability of the ATM communication system is improved and the connection switching process of the signaling message is performed at the same time. An ATM communication system that can operate at high speed can be obtained.
[0170]
Further, the notification output from the ATM signaling unit is transmitted via an unallocated channel among the channels in the reserved area other than the user information, so that the connection switching processing of the signaling message can be performed at high speed. An ATM communication system can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an ATM communication system according to a first embodiment.
FIG. 2 is an explanatory diagram of an ATM communication system according to the first embodiment.
FIG. 3 is an explanatory diagram of an ATM communication system according to the first embodiment.
FIG. 4 is an explanatory diagram of an ATM communication system according to the first embodiment.
FIG. 5 is an explanatory diagram of an ATM communication system according to the first embodiment.
FIG. 6 is an explanatory diagram of an ATM communication system according to a second embodiment.
FIG. 7 is an explanatory diagram of an ATM communication system according to a third embodiment.
FIG. 8 is an explanatory diagram of an ATM communication system according to a third embodiment.
FIG. 9 is an explanatory diagram of an ATM communication system according to a third embodiment.
FIG. 10 is an explanatory diagram of an ATM communication system according to a third embodiment.
FIG. 11 is an explanatory diagram of an ATM communication system according to a third embodiment.
FIG. 12 is an explanatory diagram of an ATM communication system according to a fourth embodiment.
FIG. 13 is an explanatory diagram of an ATM communication system according to a fourth embodiment.
FIG. 14 is an explanatory diagram of an ATM communication system according to a fourth embodiment.
FIG. 15 is an explanatory diagram of an ATM communication system according to a fourth embodiment.
FIG. 16 is an explanatory diagram of an ATM communication system according to a fifth embodiment.
FIG. 17 is an explanatory diagram of an ATM communication system according to a fifth embodiment.
FIG. 18 is an explanatory diagram of an ATM communication system according to a fifth embodiment.
FIG. 19 is an explanatory diagram of an ATM communication system according to a fifth embodiment.
FIG. 20 is an explanatory diagram of an ATM communication system according to a fifth embodiment.
FIG. 21 is an explanatory diagram of an ATM communication system according to a sixth embodiment.
FIG. 22 is an explanatory diagram of an ATM communication system according to a seventh embodiment.
FIG. 23 is an explanatory diagram of an ATM communication system according to a seventh embodiment.
FIG. 24 is an explanatory diagram of an ATM communication system according to an eighth embodiment.
FIG. 25 is an explanatory diagram of an ATM communication system according to an eighth embodiment.
FIG. 26 is an explanatory diagram of an ATM communication system according to an eighth embodiment.
FIG. 27 is an explanatory diagram of an ATM communication system according to an eighth embodiment.
FIG. 28 is an explanatory diagram of an ATM communication system according to an eighth embodiment.
FIG. 29 is an explanatory diagram of an ATM communication system according to an eighth embodiment.
FIG. 30 is an explanatory diagram of a conventional ATM communication system.
FIG. 31 is an explanatory diagram of a conventional ATM communication system.
[Explanation of symbols]
11b, 12b communication parameter correspondence table,
700 communication parameter registration request notification, 800 communication parameter registration confirmation notification,
800a, 800b communication parameter change request notification,
900 Communication parameter change confirmation notification,
1000 Communication parameter registration start request notification,
1100 Communication parameter non-registration notification,
1200 communication parameter non-registration notification confirmation notification,
1300 Communication parameter registration rejection response notification,
1400 Communication parameter registration deletion request notification,
1500 Communication parameter registration deletion confirmation notification,
1600 Database notification, 1700 Database confirmation notification.

Claims (18)

An ATM communication system having first and second ATM devices each provided with an ATM signaling unit for creating a signaling message to be transmitted and verifying the received signaling message, and performing communication between the two based on the signaling message In the first and second ATM devices, a label specified in the signaling message and an information element corresponding thereto are registered in association with each other and registered contents are equal to each other. The ATM signaling unit of the first ATM device specifies the label registered in the correspondence table of the first ATM device in the signaling message when creating the signaling message to be transmitted, creates the signaling message, and creates the signaling message. ATM signal for ATM equipment Ring portion, ATM communication system characterized in that for checking whether label specified in the signaling message upon validation of the received signaling message is registered in the correspondence table of the second ATM device. The ATM signaling unit of the first ATM device transmits a label to be registered in the correspondence table of the second ATM device, an information element corresponding to the label, and a registration request notification for requesting registration in the correspondence table of the second ATM device. The ATM signaling unit of the second ATM device outputs the label and the information element corresponding to the label based on the received registration request notification to the second ATM device. 2. The ATM communication system according to claim 1, wherein the information is registered in a table. 3. The ATM communication system according to claim 2, wherein the information elements are divided into a set of fixed parts whose contents cannot be changed and a set of variable parts whose contents can be changed. 4. The ATM communication system according to claim 3, wherein an aggregate of data indicating variable data of the variable part is further attached to the information element. The second ATM device has a timer, and the ATM signaling unit of the second ATM device starts measurement after the call setting process between the first and second ATM devices is completed and determines the predetermined value. Outputting a registration request notification reminder to the first ATM device, which urges the first ATM device to output the registration request notification, when the registration request notification is not received by the time the measured time is measured. The ATM communication system according to any one of claims 2 to 4, wherein: If the ATM signaling unit of the first ATM device does not register the label and the information element corresponding to the label in the correspondence table of the second ATM device based on the received registration request notification reminder notification, The ATM communication system according to claim 5, wherein a non-registration notification indicating the fact is output to the second ATM device. The ATM signaling section of the second ATM device, when rejecting the label in the correspondence table of the second ATM device and the registration of the label, outputs a registration rejection notice indicating that to the first ATM device. The ATM communication system according to any one of claims 2 to 5, wherein: The ATM signaling unit of the first ATM device transmits a label to be deleted from the correspondence table of the second ATM device and a deletion request notification requesting deletion of an information element corresponding to the label from the correspondence table of the second ATM device. Output, and the ATM signaling unit of the second ATM device deletes the label and the information element corresponding to the label from the correspondence table of the second ATM device based on the received deletion request notification. The ATM communication system according to any one of claims 1 to 7, wherein: 9. The ATM communication system according to claim 8, wherein, when the information element is deleted, the ATM signaling unit of the second ATM device outputs a deletion confirmation notification indicating the deletion to the originating ATM device. . The ATM signaling unit of the first ATM device outputs to the second ATM device a change request notification requesting a change of the registered contents registered in the correspondence table of the second ATM device, The ATM communication system according to any one of claims 1 to 9, wherein the ATM signaling unit changes the registered contents of the correspondence table of the second ATM device based on the received change request notification. 11. The ATM communication device according to claim 10, wherein, when the registration content is changed, the ATM signaling unit of the second ATM device outputs a change confirmation notification indicating the change to the first ATM device. system. 11. The ATM communication device according to claim 10, wherein, when rejecting the change of the registered contents, the ATM signaling unit of the second ATM device outputs a change rejection notification indicating the rejection to the first ATM device. system. The ATM signaling section of the first ATM device indicates the registered contents of the correspondence table of the first ATM device, and the registered contents of the correspondence table of the first ATM device and the registered contents of the correspondence table of the second ATM device. And outputs a registration content confirmation request notification requesting confirmation to the second ATM device. The ATM signaling unit of the second ATM device transmits the registration content confirmation request notification to the first ATM device based on the registration content confirmation request notification. 13. The ATM communication system according to claim 1, wherein the registered contents of the correspondence table and the registered contents of the correspondence table of the second ATM device are checked. The registration content confirmation request notification indicates that the physical disconnection of the line between the first ATM device and the second device is restored, and the ATM signaling units of the first and second ATM devices are connected to each other. 14. The ATM communication system according to claim 13, wherein the output is made when it is confirmed that the used ATM device is the ATM device connected before disconnection. 15. The registration content confirmation request notification, wherein all labels registered in the correspondence table of the first ATM device indicate the contents of the correspondence table of the first ATM device. ATM communication system. The registration content confirmation request notification indicates the contents of the correspondence table of the first ATM device by using all the labels registered in the correspondence table of the first ATM device and information elements corresponding to the labels. The ATM communication system according to claim 13 or 14. The ATM signaling unit of the second ATM device, if the registration content of the correspondence table of the first ATM device does not match the registration content of the correspondence table of the second ATM device, Outputting a registration deletion request notification requesting that the contents be deleted from the correspondence table of the second ATM device, and that the non-matching registration contents be deleted from the correspondence table of the first ATM device; 17. The ATM communication according to claim 13, wherein the ATM signaling unit of the ATM device deletes the registered contents from the correspondence table of the first ATM device based on the received registration deletion request notification. system. The ATM communication system according to any one of claims 1 to 17, wherein the notification output from the ATM signaling unit is transmitted via an unallocated channel among channels in a reserved area other than the user information.

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