JPH11317749A - Method and device for fast connection setting and releasing for svc server on atm communication network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for fast connection setting and releasing which can improve the call processing capability of an exchange and reduce a connection delay and are applicable to a large-scale network and an interconnection network without requiring any hardware for sending and receiving special signals associated with connection setting. SOLUTION: Each ATM exchange has a VCC management part 2 which manages VCC set previously between exchanges, and band management part 3 which manages the band of VP, an accommodated terminal management part 4 which manages the correspondence between subscriber terminals and accommodated ATM exchanges, and a switch part 5 which makes and breaks connections, and transfers signals used for normal SVC service, link by link, when setting and releasing a connection, and an origination-side and a termination-side ATM exchange set and reset a connection by connecting and disconnecting VC acquired on a subscriber network side and another network side and also making and breaking a repeating connection set previously between the origination and termination exchanges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchr
onous Transfer Mode (Asynchronous Transfer Mode) The present invention relates to a connection setting technique in an SVC (Switched Virtual Channel) service for setting a connection between arbitrary network elements in response to a communication request on a communication network, and particularly relates to a processing amount related to the connection setting. The present invention relates to a high-speed connection setup / release method and a high-speed connection setup / release device capable of reducing the number of calls, improving the call processing capability of an exchange, and reducing the connection delay.

[0002]

2. Description of the Related Art In the prior art, when a connection is set up between arbitrary subscriber terminals on an ATM communication network, a path selection and a virtual path identifier (VPI) are performed in all ATM exchanges on a path for setting the connection. )
・ Capture of VCI (virtual channel identifier),
It is necessary to secure the required bandwidth, set a header conversion table based on the captured VPI / VCI, and the like. In particular, the setting of the header conversion table for setting the hardware requires a relatively long processing time. Therefore, in the related art, the connection is set after the calling subscriber terminal issues a communication request. Therefore, there is a problem that a connection delay until communication can be actually started increases.

As a technique for solving the problem of the connection delay, for example, there is a technique disclosed in Japanese Patent Application Laid-Open No. 9-266478. The technology disclosed in this gazette
VPC (virtual path connectivity) between TM exchanges
on) is set, and a part of the route is
When setting a connection that matches the route of C, the connection is set using the VPC. Specifically, by transferring the call setting request signal using the VPC, the processing at the ATM exchange that relays the VPC is skipped. Therefore, the present technology has an effect of reducing the connection delay. However, in the present technology, since the process of securing the bandwidth is omitted, it is difficult to apply the present technology to a service that requires bandwidth guarantee.

Another technique for solving the problem of the connection delay is disclosed, for example, in Japanese Patent Application Laid-Open No. 8-186578. According to the technique disclosed in this publication, a VCC (Virtual Channel Connection) is set in advance between any two terminals or between two ATM exchanges, and part or all of the route is set to a predetermined VCC route. When setting up a matching connection,
The connection is set using the VCC. Specifically, the "bandwidth reserved cell" is transferred by using the VCC, and the ATM cell exchange which relays the VCC receiving the "bandwidth reserved cell" and the ATM exchange terminating the VCC receives the bandwidth reserved cell. The bandwidth specified in the above is secured by hardware. For this reason, the present technology has an effect of reducing the connection delay described above, and can secure a band, so that it can be applied to a service that requires a band guarantee. However, special hardware having a function of transmitting and receiving the “band reservation cell”, interpreting the contents of the “band reservation cell”, and securing a band is required.

[0005]

As described above, AT
In providing an SVC service for setting up a connection between arbitrary network elements on an M communication network, in the related art, route selection, acquisition of VPI / VCI, securing of required bandwidth, and provision of acquired VPI / VCI There is a problem of connection delay due to setting of a header conversion table based on the above. Japanese Patent Application Laid-Open No. 9-266478, which is a technique for solving the connection delay problem, has a problem that a connection for guaranteeing a bandwidth cannot be provided. Also, Japanese Patent Laid-Open No. 8-18 is a technique for solving the connection delay problem.
Regarding the publication No. 6578, a band reservation cell is transmitted and received,
In addition, there is a problem that special hardware for interpreting the band reservation cell and securing the band is required.

The present invention solves the above-mentioned problems in the prior art and reduces the amount of processing in each exchange, in particular, the amount of processing relating to the setting of a header conversion table, thereby improving the call processing capability of the exchange and improving the connection processing. A high-speed connection setup / release method that can reduce delay, does not require hardware for transmitting and receiving special signals associated with connection setup, and can be applied to large-scale networks and interconnected networks. The purpose is to provide a high-speed connection setup / release device.

[0007]

In order to achieve the above object, a high-speed connection setting method according to the present invention comprises a plurality of ATM exchanges and a plurality of network elements such as subscriber terminals or other networks accommodated in the ATM exchanges. A composed of
In an SVC service for setting up a connection between arbitrary network elements in response to a communication request in a TM communication network, a VCC in which a band is not secured between arbitrary ATM exchanges is set in advance as a relay connection, Alternatively, in the originating and destination ATM exchanges accommodating other networks, VCs captured on the subscriber side or other network side.
And setting and releasing of a connection by connecting and disconnecting a relay connection established between the originating ATM switch and the destination ATM exchange. When a connection is set and released, a normal SVC is used. By transferring the signal used in the service to the link-by-link, the normal SV can be used for the relay connection part.
As in the case of the C service, the connection is set and released by performing band management. In order to achieve the above object, a high-speed connection setting apparatus according to the present invention is designed so that a V
A VCC management unit that manages a CC, a bandwidth management unit that manages a VP band, an accommodation terminal management unit that manages the correspondence between a subscriber terminal and an accommodated ATM exchange, and a switch unit that connects and disconnects a connection. It is characterized by having.

According to the present invention, there is further provided a VC which does not secure a band between arbitrary ATM exchanges as a relay connection.
As a first method for setting C in advance, a setting command is transmitted from a maintenance operation device provided in the ATM communication network. Further, the present invention provides a second method for presetting a VCC in which a band is not secured between arbitrary ATM exchanges as a relay connection, as a VC between an originating subscriber and a destination subscriber set in a normal SVC service.
C, the V between the originating and destination ATM exchanges
The CC is retained and reused for a certain period of time as the VCC of the relay connection for which the bandwidth is not secured even after the termination of the SVC service. It is characterized by releasing VCC.

[0009]

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a detailed view of an ATM exchange for realizing a high-speed connection setting device according to the present invention. The ATM exchange 1 in the present embodiment includes a VCC management unit 2 for managing a VCC preset between arbitrary ATM exchanges, a bandwidth management unit 3 for managing a VP band, and an ATM exchange accommodating a subscriber terminal. And a switch unit 5 for connecting and disconnecting connections.

[0010] The VCC management unit 2 stores a preset V
As for the CC, the correspondence between the ATM switch and the VCC and the usage status of the VCC are managed, and the VC set in advance for the ATM switch using the ATM switch as a search key.
C that is not being used is searched from C, and the corresponding VC
The destination exchange-VCC correspondence table 2a which provides a function of acquiring the number of the transmission link of C and the VPI / VCI, and the number and VPI of the transmission link of one of the VCs constituting the VCC with respect to the preset VCC.・ VCI
And the transmission link number and VPI / VCI of the other VC
To manage the transmission link number and VPI / V
VCI-VC that provides a function of searching for a preset VCC using the CI as a search key and obtaining the transmission link number and VPI / VCI of the other VC of the corresponding VCC
It is composed of a C correspondence table 2b.

The band management unit 3 is composed of a VP band management table 3a for managing the VP free band for each VPI of the transmission link. The accommodated terminal management unit 4 manages the correspondence between the subscriber terminal and the accommodated ATM exchange, and provides a function of searching for the ATM exchange accommodating the subscriber terminal using the subscriber terminal as a search key. Table 4
a. The switch unit 5 includes a header conversion table 5a that provides a function of changing the VPI and VCI in the transferred cell header according to the set connection.

FIG. 2 is a diagram showing a network configuration used in an embodiment of the present invention. In the figure, 71a and 71b
Is a subscriber terminal, and 72a to 72c are ATM exchanges 1 of FIG.
ATM exchanges having the same configuration as
A transmission link 74a corresponding to a physical transmission line such as an optical fiber for interconnecting between the TM exchanges or between the ATM exchange and the subscriber terminal. A transmission link 74a is set between the ATM exchange 72a and the ATM exchange 72c via the ATM exchange 72b. VCC (Virtual Channel Connection).

Next, in the network of FIG. 2, the subscriber terminal 71a makes a call to the subscriber terminal 71b, establishes a connection between the subscriber terminal 71a and the subscriber terminal 71b, and after the setting, The procedure for releasing the connection from the subscriber terminal 71a will be described with reference to the sequence diagram of FIG. 3 and the flowcharts of FIGS.

In the sequence diagram of FIG.
1d is a call setting request signal, 92a to 92d are call setting response signals, and 93a to 93d are call release signals. FIG. 4 is a flowchart showing processing in the ATM exchange at the time of a connection setting request, FIG. 5 is a flowchart showing processing in the ATM exchange at the time of a connection setting response, and FIG.
5 is a flowchart showing a process in the ATM exchange when releasing the connection.

In FIG. 4 and FIG. 5, the subscriber terminal 71a requesting the start of communication is a calling subscriber terminal, the subscriber terminal 71b to be a communication partner is a called subscriber terminal, and the calling subscriber terminal 71a is a called subscriber terminal. Sending out ATM switch 72a to accommodate
The M exchange and the ATM exchange 72c accommodating the destination subscriber terminal 71b are replaced by the destination ATM exchange and the originating ATM exchange 72a.
The ATM switch 72b that relays between the ATM switch 72c and the destination ATM switch 72c is called a relay ATM switch, and the originating subscriber terminal side is the incoming side and the destination subscriber terminal side when viewed from each ATM switch on the path for setting the connection. Is called the exit side. In FIG. 12, the subscriber terminal 71a requesting the release of the connection is the releasing subscriber terminal, the subscriber terminal 71b to be released is the released subscriber terminal, and the releasing subscriber terminal 7 is shown.
The ATM exchange 72a accommodating 1a is referred to as a release ATM exchange, the ATM exchange 72c accommodating the subscriber terminal 71b to be released is referred to as an ATM exchange to be released, and the ATM exchange 72b for relaying a connection to be released is referred to as a relay ATM exchange. Each ATM on the route where the connection is set
When viewed from the exchange, the release side subscriber terminal side is referred to as an incoming side, and the released side subscriber terminal side is referred to as an outgoing side.

Here, specific examples of the various tables shown in FIG. 1 used in the present configuration are shown. FIG. 7 shows a calling side ATM switch 72.
FIG. 8 is a diagram showing an example of a destination-side exchange-VCC correspondence table 2a held by a. FIG. 8 is a diagram showing an example of a VCI-VCC correspondence table 2b held by a transit ATM exchange 72b, and FIG. FIG. 10 is a diagram showing an example of the VCI-VCC correspondence table 2b held by the side ATM switch 72c. FIG. 10 shows the VP held by the originating side ATM switch 72a.
FIG. 11 is a diagram illustrating an example of a band management table 3a;
FIG. 4 is a diagram showing an example of an accommodation terminal-exchange correspondence table 4a held by each of the ATM exchanges (72a to 72c);
FIG. 12 is a diagram showing an example of the header conversion table 5a held by the relay ATM exchange 72b.

In this configuration, the originating subscriber terminal 71a
First, a call setting request signal 91a which specifies a requested band (hereinafter referred to as a requested band) with the called subscriber terminal 71b.
To the originating ATM switch 72a that accommodates the terminal itself (hereinafter, refer to the sequence diagram of FIG. 3 and the flowcharts of FIGS. 4 to 6). Originating ATM switch 72a
Is a call setting request signal 91a from the calling subscriber terminal 71a.
Is received (FIG. 4, step 101), it is confirmed whether or not VPI / VCI is specified in the call setting request signal 91a (same; step 102). As a result of confirmation, VPI in this case
Since it is known that the VCI is not specified (step 102: N), the VPI in the inbound transmission link 73a
VCI is selected (same; step 103), and the selected VP
The I · VCI is captured and a band corresponding to the requested band is secured (step 104).

Next, the accommodating terminal management unit 4 in the ATM exchange 72a determines that the own ATM exchange 72a
It is confirmed whether or not b is accommodated using the accommodation terminal-exchange apparatus correspondence table 4a (see FIG. 11) (the same; step 105). As a result of the confirmation, it is found that the receiving side subscriber terminal 71b is accommodated by the receiving side ATM switch 72c (same; Step 105: N), and the VCC management unit 2 sets the destination side subscriber terminal 71b toward the receiving side ATM switch 72c. V not in use
Whether the CC exists or not is searched using the destination exchange-VCC correspondence table 2a (see FIG. 7) (the same as in step 1).
06). Here, it is assumed that the VCC 74a is not in use, and as a result of the search, it is found that the VCC 74a that is not in use is set (step 106: Y).
The C management unit 2 sets that the VCC 74a is in use in the destination exchange-VCC correspondence table 2a (same; step 107).

Next, the VPI of the VC on the output side of the VCC 74a
After selecting the VCI (same as step 108), the band management unit 3 updates the VP band management table 3a (see FIG. 10) to change the VCC7 for the outgoing side of the VCC74a.
VC corresponding to the requested bandwidth from the VP accommodating the outgoing VC of 4a
A band for C is secured (same; step 109). After the processing in step 109, the VPI
The VCI is captured (same as step 110). As described above, after the processing of steps 101 to 110 is completed, the calling side A
The TM exchange 72a transmits a call setup request signal 91b designating the called subscriber terminal 71b, the captured VPI / VCI on the outgoing side, and the required bandwidth to the relay ATM exchange 72b (step 120).

Next, the relay ATM switch 72b
Upon receiving the call setting request signal 91b from the TM exchange 72a (same; step 101), it checks whether VPI / VCI is specified in the call setting request signal 91b (same; step 102). As a result of the confirmation, it is found that the VPI / VCI is specified this time (step 102:
Y), the VCC management unit 2 specifies the designated VPI / VC
The presence / absence of a VCC corresponding to I is searched using the VCI-VCC correspondence table 2b (see FIG. 8) (same; step 111). As a result of the search, it is found that the VCC 74a corresponds (step 111: Y), and the VCC 74a
Is not terminated at the own ATM switch 72b (same; step 112: N), the bandwidth management unit 3
By updating the band management table 3a, the VCC 74a
V that accommodates the VC on the entry side of VCC 74a
A VCC band for the requested band is secured from P (same; step 113), and the VCC 74a is output from the VCC 74a.
Of the requested VC from the VP accommodating the outgoing VC (step 114). As described above, after completing the processing of steps 101 to 102 and steps 111 to 114, the relay ATM switch 72b
Is the incoming subscriber terminal 71b and the outgoing V of the VCC 74a.
The VPI / VCI of C and the call setting request signal 91c designating the required bandwidth are transmitted to the destination ATM exchange 72c (step; 120).

Next, the receiving side ATM switch 72c is connected to the relay A
Upon receiving the call setting request signal 91c from the TM exchange 72b (FIG. 4, step 101), the call setting request signal 91c
It is checked whether or not VPI / VCI is specified in the program (the same; step 102). As a result of the confirmation, it is found that VPI / VCI has been designated (step 102: Y).
The CC management unit 2 searches for the presence or absence of a VCC corresponding to the specified VPI / VCI using the VCI-VCC correspondence table 2b (see FIG. 9) (step 11).
1). As a result of the search, it is found that the VCC 74a corresponds (step 111: Y), and the VCC 74a
Since it is known that the termination is performed at the M exchange 72c (same; step 112: Y), the VCC management unit 2 transmits
The fact that the VCC 74a is in use is set in the VCC correspondence table 2a (step 115).

Next, the band management unit 3 updates the VP band management table 3a to secure a required VCC band from the VP accommodating the VC on the input side of the VCC 74a for the input side of the VCC 74a ( Same; Step 11
6). After the processing of step 116, the call setting request signal 91
captures the VPI / VCI specified in c.
Step 117). After the processing of step 117, the VPI / VCI in the transmission link 73d on the outgoing side is selected (the same; step 118), the selected VPI / VCI is captured, and a band for the requested band is secured (the same; step 11).
9). As described above, after the processing of steps 101 to 102, steps 111 to 112 and steps 115 to 119 is completed, the destination ATM switch 72c
Is the outgoing VPI · V captured by the called subscriber terminal 71b.
A call setting request signal 91d specifying the CI and the requested band is transmitted to the called subscriber terminal 71b (same as in step 1).
20).

When receiving the call setting request signal 91d from the destination ATM switch 72c, the destination subscriber terminal 71b transmits a call setting response signal 92a to the destination ATM switch 72c.

The destination ATM exchange 72c receives the call setting response signal 92a from the destination subscriber terminal 71b (FIG. 5;
Step 201) For the connection to be set, the ingress uses VCC (same; step 202:
Y), when the output side recognizes that it does not use VCC (same; step 203: N), the switch unit 5 makes the header conversion table 5a according to the captured inbound VPI / VCI and the outbound VPI / VCI. (Step 2)
04). As described above, after finishing the processing of steps 201 to 204, the destination ATM exchange 72c transmits a call setting response signal 92b to the relay ATM exchange 72b (the same; step 205).

Next, the relay ATM switch 72b
Upon receiving the call setting response signal 92b from the TM exchange 72c (FIG. 5, step 201), the incoming side uses VCC for the connection to be set (step 202:
Y), if the outgoing side also recognizes that VCC is used (step 203; Y), the call setting response signal 92c is transmitted to the calling side ATM switch 72a without setting the header conversion table 5a. (Same as step 205).

Next, the originating ATM switch 72a sends
Upon receiving the call setting response signal 92c from the TM exchange 72b (FIG. 5, step 201), and recognizing that the incoming side does not use VCC for the connection to be set (step; step 202: N), the switch unit 5 Sets the header conversion table 5a according to the captured VPI / VCI on the ingress side and the VPI / VCI on the egress side (step 2).
04). After the processing of steps 201 to 202 and step 204 has been completed, the originating ATM switch 7
2a transmits a call setting response signal 92d to the calling subscriber terminal 71a.
(Step 205).

When the originating subscriber terminal 71a receives the call setting response signal 92d from the originating ATM switch 72a, the communication is started.

Next, a procedure for releasing the connection set by using the VCC 74a in the above processing will be described. The release side subscriber terminal 71a is a connection to be released (hereinafter, referred to as a connection to be released).
Is transmitted to the release side ATM exchange 72a accommodating its own terminal.

The release side ATM exchange 72a receives the call release signal 93a from the release side subscriber terminal 71a (FIG. 6;
Step 301), when recognizing that the ingress side of the connection to be released specified in the call release signal 93a does not use VCC (same; step 302: N), the switch unit 5 sets the header conversion table for the connection to be released. The setting of 5a is canceled (same as step 303). Next, the VPI / VC in the captured inbound transmission link 73a is
The band secured as I is released (step 304).
Next, upon recognizing that the egress side of the connection to be released uses the VCC 74a (same; step 305:
Y), the band management unit 3 updates the VP band management table 3a to release the band secured on the output side of the VCC 74a (step 306).

Next, the VP on the output side of the captured VCC 74a is
After releasing the I / VCI (same; step 307), the VC
The C management unit 2 cancels the in-use setting of the VCC 74a set in the destination exchange-VCC correspondence table 2a (the same; step 308). As described above, after the processing of steps 301 to 308 is completed, the release side ATM switch 72
a is a call release signal 93 designating a connection to be released.
b is transmitted to the relay ATM exchange 72b (step 317).

Next, the relay ATM switch 72b receives the call release signal 93b from the release side ATM switch 72a (FIG. 6, step 301), and the incoming side of the release target connection specified in the call release signal 93b is the VCC 74a. (Same; step 302: Y), and the outgoing side is also V
When recognizing that the CC 74a is used (same; step 309: Y), the bandwidth management unit 3 updates the VP bandwidth management table 3a to update the bandwidth secured on both the input side and the output side of the VCC 74a. Release (same; step 310, step 311).

As described above, after completing the processing of steps 301 to 302 and steps 309 to 311, the relay ATM exchange 72b sends a call release signal 93c designating the connection to be released to the released ATM switch 72c. Transmit (same; step 317).

Next, the to-be-released ATM switch 72c receives the call release signal 93c from the relay ATM switch 72b (FIG. 6; step 301), and the incoming side of the connection to be released specified in the call release signal 93c becomes active. (The same; step 302: Y), and the outgoing side is VC
When it recognizes that C is not used (same; Step 3
09: N), the switch unit 5 cancels the setting of the header conversion table 5a relating to the connection to be released (same as above;
Step 312). Next, the bandwidth management unit 3 updates the VP bandwidth management table 3a to release the bandwidth secured on the input side of the VCC 74a (the same as in step 31).
3). Next, the VPI · V on the input side of the captured VCC 74a
After releasing the CI (same; step 314), the VCC management unit 2 cancels the in-use setting of the VCC 74a set in the destination exchange-VCC correspondence table 2a (same;
Step 315). After the processing in step 315, the acquired VPI / VCI and the secured band in the transmission link 73d on the outgoing side are released (step 316).

Steps 301 to 302,
Step 309, and steps 312 to 31
After the processing of step 6, the released-side ATM switch 72c
A call release signal 93d that specifies a connection to be released,
The message is transmitted to the subscriber terminal 71b to be released (step 317). When the released subscriber terminal 71b receives the call release signal 93d from the released ATM switch 72c, the communication ends.

According to the embodiment of the present invention described above, A
In providing the SVC service on the TM communication network, by setting a VCC in advance between arbitrary ATM exchanges as a relay connection, a processing amount related to connection setting,
In particular, it is possible to reduce the processing amount related to the header conversion table setting. As a result, the effect of reducing the connection delay and the effect of improving the call processing capability of the ATM exchange can be obtained. In addition, the relay connection in the present invention does not necessarily need to be set between end-to-end ATM exchanges, and may be set between arbitrary ATM exchanges. The present invention is applicable. Further, since the call setup request signal, the call setup response signal, and the call release signal used in the present invention can be realized by using the signals in the existing protocol, even if the present invention is applied, the service according to the existing protocol such as a band change is applied. Can be provided.

Next, an embodiment of a method for setting / releasing a relay connection for realizing a method for setting / releasing a high-speed connection will be described. FIG. 13 and FIG.
FIG. 2 is a detailed diagram of an ATM switch for implementing the embodiment. The ATM exchange shown in FIG.
It has the same configuration as the ATM exchange shown in FIG. The command receiving unit 6 has a function of receiving a VCC setting / cancellation command from the maintenance operation device 7 of the ATM exchange and instructing the VCC management unit 2 and the switch unit 5 of necessary processing. The ATM switch shown in FIG. 14 has the same configuration as that of the ATM switch shown in FIG. 1 except that a timer monitoring unit 8 is added. The timer monitoring unit 8 determines that the relay connection is SVC
It consists of a VCC timer monitoring table that monitors the time that is not used for services.

FIG. 15 is a flowchart showing the processing of the subscriber ATM exchanges 72a and 72c when setting the relay connection. FIG. 16 shows a relay AT when a relay connection is set.
It is a flow chart which shows processing of M exchange 72b. FIG. 17 is a diagram showing an example of the destination ATM switch-VCC correspondence table held by the ATM switch 72a. FIG. 18 is a diagram showing an example of the VCI-VCC correspondence table 2b held by the ATM exchange 72a. FIG. 19 is a diagram showing an example of the VCI-VCC correspondence table 2b held by the ATM exchange 72b. FIG. 20 is a diagram showing an example of the header conversion table 5a held by the ATM exchange 72b. FIG. 21 is a diagram showing an example of the destination ATM switch-VCC correspondence table 2a held by the ATM switch 72c. FIG.
FIG. 2 is a diagram showing an example of a VCI-VCC correspondence table 2b held by the ATM exchange 72c. FIG. 23 is a flowchart showing the processing of the subscriber ATM exchange when the relay connection is released. FIG. 24 is a flowchart showing the processing of the relay ATM exchange when the relay connection is released.

Next, a description will be given of an embodiment of a method of setting a relay connection for realizing a method of setting and releasing a high-speed connection. The maintenance operation device 7 (see FIG. 13) sends a command to the command receiving unit 6 of the ATM switch 72a,
A VCC setting request is issued by designating the transmission link and the VPI / VCI of the relay connection. Command receiving unit 6 that has received the VCC setting request (FIG. 15; step 501)
Sets the designated destination switch, the transmission link of the relay connection, and the VPI / VCI in the destination switch-VCC correspondence table 2a (see FIG. 17) of the VCC management unit 2, and sets the busy flag to "not in use". Set (same; step 50)
2). Next, the VCI-VCC correspondence table 2b (FIG. 18)
), The transmission link of the specified transit connection,
The VPI / VCI is set (same; step 503).

Next, the maintenance operation device 7 is connected to the ATM switch 7
A VCC setting request is issued to the command receiving unit 6 of 2b by designating the transmission link and VPI / VCI of the input-side relay connection and the transmission link and VPI / VCI of the output-side relay connection. Command receiving unit 6 that has received the VCC setting request (FIG. 16; step 601)
Is the VCI-VCC correspondence table 2b of the VCC management unit 2.
In FIG. 19, the transmission link and the VPI / VCI of the designated relay connection, and the transmission link and the VPI / VCI of the corresponding relay connection are set (the same; step 602). After the above processing, the transmission link and VPI / VCI of the relay connection on the input side and the transmission link and VPI / VCI of the relay connection on the output side are stored in the header simulation table 5a of the switch unit 5 (see FIG. 20). It is set (same; step 603).

Next, the maintenance operation device 7 is an A1M exchange 7
2c, specify the destination exchange, the transmission link of the relay connection, and the VPI / VCI
Issues a VCC setting request. Upon receiving the VCC setting request (FIG. 15; step 501), the command receiving unit 6
The designated destination exchange, the transmission link of the relay connection, and the VPI / VCI are set in the destination exchange-VCC correspondence table 2a (see FIG. 21) of the C management unit 2, and the busy flag is set to unused. (Same; step 502). Next, the VCI-VCC correspondence table 2b (see FIG. 22)
The transmission link of the specified relay connection, VPI
-Set the VCI. Through the above processing, a relay connection is set between the ATM exchanges 72a-72b-72c.

Next, a description will be given of an embodiment of a relay connection release method for realizing the high-speed connection setup / release method. The maintenance operation device 7 issues a VCC release request to the command receiving unit 6 of the ATM exchange 72a by designating the destination exchange, the transmission link of the relay connection, and the VPI / VCI. VCC release request is received (Fig. 2
3; Step 701) The command receiving unit 6 releases the relay connection from the destination exchange-VCC correspondence table 2a of the VCC management unit 2 (Same; Step 702). Next, the relay connection is released from the VCI-VCC correspondence table 2b (the same; step 703).

Next, the maintenance and operation device 7 is connected to the ATM switch 7
For the command receiving unit 6 of FIG. 2b, the transmission link and the VPI / VCI of the relay connection and the transmission link and the VPI / VCI of the corresponding relay connection are designated and the VC
Issues a C release request. The command receiving unit 6 having received the VCC release request (FIG. 24; step 801) releases the relay connection from the VCCI-VCC correspondence table 2b of the VCC management unit 2 (step; 802). After the above processing, the relay connection is released from the header conversion table 5a of the switch unit 5 (step; step 80).
3).

Next, the maintenance and operation device 7 is connected to the ATM switch 7
2c, specify the destination exchange, the transmission link of the relay connection, and the VPI / VCI
Issues a VCC release request. Upon receiving the VCC release request (FIG. 23; step 701), the command receiving unit 6
Release the relay connection from the destination exchange-VCC correspondence table 2a of the CC management unit 2 (same as step 70)
2). Next, the relay connection is released from the VCI-VCC correspondence table 2b (the same; step 703). By the above processing, the ATM exchanges 72a-72b-72c
The relay connection set between them is released.

Next, embodiments for implementing a relay connection setting method for realizing the high-speed connection setup / release method and a relay connection release method for realizing the high-speed connection setup / release method will be described.

FIG. 25 is a signal sequence diagram in this embodiment. Reference numerals 94a to 94b in FIG. 14 denote VCC release signals for releasing VCC when the VCC monitoring timer (see FIG. 14) times out. FIG. 26 shows VCC
It is a flow chart which shows processing in an ATM exchange at the time of a timeout of a monitoring timer. FIG. 27 is a flowchart showing processing in the ATM exchange when receiving a call setting request signal. FIG. 28 is a flowchart showing the processing in the ATM exchange when receiving the call release signal. FIG. 29 is a diagram showing an example of a VCC timer monitoring table held by the originating ATM switch 72a. FIG. 30 shows the ATM switch 7
FIG. 4 is a diagram showing an example of a destination ATM exchange-VCC correspondence table 2a held by 2a. FIG. 31 shows an ATM switch 72.
Callee-side ATM exchange-VCC correspondence table 2 held by a
It is a figure showing an example of a. FIG. 32 shows an ATM switch 72c.
-Side ATM exchange-VCC correspondence table 2a owned by the company
It is a figure showing an example of.

First, an embodiment of a relay connection setting method for realizing a high-speed connection setting / release method will be described. In the network of FIG.
a makes a call to the subscriber terminal 71b,
a connection is set up between a and the subscriber terminal 71b,
After the setting, the connection is released from the subscriber terminal 71a, and as a result, the ATM exchanges 72a-72b-7 are released.
FIG. 25 shows a procedure for setting a relay connection between 2c.
Will be described with reference to the sequence diagram of FIG.

Hereinafter, description will be made in accordance with the same procedure as in paragraph [0017] and thereafter. In this configuration, the calling subscriber terminal 71a firstly transmits a call requesting signal 91a designating the calling subscriber terminal 71a to the called subscriber terminal 71b (hereinafter, referred to as a requested band) and a requested band. The message is transmitted to the originating ATM switch 72a accommodating the terminal. The calling side ATM switch 72a is connected to the calling side subscriber terminal 71a.
When the call setting request signal 91a is received (FIG. 27; step 101), the VPI ·
Check whether the VCI is specified (same as step 10)
2). As a result of the confirmation, it is found that VPI / VCI is not specified in this case (the same; Step 102:
N), the VPI / VCI in the incoming transmission link 73a is selected (same; step 103), and the selected VPI / VCI is selected.
And secure the bandwidth for the required bandwidth.
Step 104).

Next, the accommodating terminal management unit 4 in the ATM exchange 72a determines that the own ATM exchange 72a
It is confirmed whether or not b is accommodated using the accommodation terminal-exchange apparatus correspondence table 4a (see FIG. 11) (the same; step 105). As a result of the confirmation, it is found that the receiving side subscriber terminal 71b is accommodated by the receiving side ATM switch 72c (same; Step 105: N), and the VCC management unit 2 sets the destination side subscriber terminal 71b toward the receiving side ATM switch 72c. V not in use
The destination exchange-VCC correspondence table 2 determines whether a CC exists.
a (see FIG. 30).
6). Here, since there is no usable VCC (step 106: N), the outgoing transmission link 73b
In step 121, the VPI / VCI not used for VCC is selected, and the transmission link and the selected VP are stored in the destination exchange-VCC table 2a (see FIG. 31).
I / VCI, setting of busy flag (same; step 1)
22). Then, the transmission link and the selected VPI / VCI
It is set in the CI-VCC correspondence table 2b (see FIG. 18) (same as step 123). In this embodiment, the outgoing transmission link 73b, VPI = 10, and VCI = 20 are set.

Next, the bandwidth management unit 3 updates the VP bandwidth management table 3a (see FIG. 10), secures a required VCC bandwidth from the VP accommodating the outgoing VC, and selects it in step 121. The captured VPI / VCI is captured (same as step 119). After the above processing is completed, the calling-side ATM exchange 72a sets the outgoing-side VPI / VCI and the requested band captured by the called-side subscriber terminal 71b, and the calling-side subscriber terminal 7b.
A call setting request signal 91b specifying 1a is transmitted to the relay ATM exchange 72b (same as step 120).

Next, the transit ATM exchange 72b
Upon receiving the call setting request signal 91b from the TM exchange 72a (same; step 101), it checks whether VPI / VCI is specified in the call setting request signal 91b (same; step 102). As a result of the confirmation, it can be seen that the VPI / VCI is specified (step 10
2: Y), the VCC management unit 2
The presence or absence of VCC corresponding to VCC is determined by VCI-VCC.
A search is made using the correspondence table 2b (see FIG. 8) (same; step 111). As a result of the search, the corresponding VCC
(Step 111:
N), VPI / VCI capture and bandwidth reservation on the ingress side are performed (the same; step 124).

Next, the accommodating terminal management unit 4 in the ATM exchange 72b determines that the own ATM exchange 72b
It is confirmed whether or not b is accommodated using the accommodation terminal-exchange correspondence table 4a (see FIG. 11) (same as step 125). As a result of the confirmation, it is found that the own ATM exchange 72b does not accommodate the called subscriber terminal 71b (same; step 125: N), and thus selects the outgoing VPI / VCI (same; step: 126). In this embodiment, the outgoing transmission link 73c, VPI = 50, and VCI = 30 are set. The correspondence between the designated VPI / VCI on the incoming side and the transmission link and the correspondence between the selected VPI / VCI on the outgoing side and the transmission link
-Set in the VCC correspondence table 2b (see FIG. 19) (same; step 127).

Next, the band management unit 3 updates the VP band management table 3a to secure a VCC band for the requested band from the VP accommodating the outgoing VC (same as in step 12).
8), the input side and output side transmission links / VPI / VCI are stored in the header conversion table 5a (see FIG. 20) of the switch section.
Is set (step 129). After the above processing is completed, the relay ATM switch 72b returns to the called subscriber terminal 71.
b, the outgoing side VPI / VCI, the requested band, and the call setting request signal 91c specifying the calling side subscriber terminal 71a.
The message is transmitted to the destination ATM exchange 72c (same as step 120).

Next, the receiving-side ATM exchange 72c sends the relay A
Upon receiving the call setting request signal 91c from the TM exchange 72b (step 101). It is confirmed whether or not VPI / VCI is specified in the call setting request signal 91c (same; step 102). As a result of the confirmation, it is found that VPI / VCI is specified (same; step 102: Y).
The VCC management unit 2 searches the presence / absence of a VCC corresponding to the specified VPI / VCI using the VCC-VCI correspondence table 2b (see FIG. 9) (same as in step 1).
11). As a result of the search, it is found that there is no corresponding VCC (same; step 111: N), so that the incoming VP
Acquire I.VCI and secure band (same; step 12)
4).

Next, the accommodated terminal management unit 4 in the ATM exchange 72c determines that the own ATM exchange 72c
It is confirmed whether or not b is accommodated using the accommodation terminal-exchange correspondence table 4a (see FIG. 11) (same as step 125). As a result of the confirmation, it can be seen that the own ATM exchange 72c accommodates the called subscriber terminal 71b.
Step 125: Y), VCC-VCI correspondence table 2
b (see FIG. 22) to the transmission link V
The PI / VCI is set (same as step 130).

Next, the accommodation terminal management unit 4 in the destination ATM exchange 72c searches the accommodation terminal-exchange correspondence table 4a in order to search for the ATM exchange accommodating the calling subscriber terminal 71a.
(The same; step 131). As a result, ATM
Since it is known that the exchange 72a is applicable, the destination ATM
The destination-side exchange-VCC correspondence table 2a (see FIG. 32), the destination-side ATM exchange (which is 72a in this embodiment), the transmission link, the VPI / VCI, and the in-use flag held by the exchange 72c are set to be in use (see FIG. 32). Same; step 132).

After the processing in step 132, the VPI / VCI in the transmission link 73d on the outgoing side is selected (the same; step 118), the selected VPI / VCI is captured, and the bandwidth for the requested band is secured (the same). Step 119).
After the above processing is completed, the destination ATM switch 72c sets the outgoing VPI / VCI and the requested bandwidth captured by the destination subscriber terminal 71b, and the call setting request signal 91d specifying the calling subscriber terminal 71a. Is transmitted to the called subscriber terminal 71b (the same; step 120). In the present embodiment, as a result of the above processing, VCC set between the ATM switches 72a-72b-72c is referred to as VCC 74a.

Thereafter, the paragraph numbers [0023] to [002]
After performing the same processing as in [9], the release VPI / VCI of the captured VCC 74a is released (FIG. 28; step 307), and the VCC management unit 2 then sends the received exchange 74 to the destination exchange-VCC correspondence table 2a. The setting in use of the set VCC 74a is released (the same; step 308). Next, VCC
The monitoring flag of the timer monitoring table (see FIG. 19) is set to "monitoring"(same; step 318). As described above, after the processing of steps 301 to 308 and 318 is completed, the release-side AT
The M exchange 72a transmits a call release signal 93b designating a connection to be released to the relay ATM exchange 72b.

Thereafter, the paragraph numbers [0031] to [003]
4]. As a result of the above processing, a relay connection for realizing the high-speed connection setup / release method is set between the ATM switches 72a-72b-72c.

Next, a description will be given again of a difference between the above-described embodiment of the high-speed connection setting and release in the processing for setting up a call from the subscriber terminal 71a to the subscriber terminal 71b. After performing the processing of paragraph numbers [0017] to [0018], the monitoring flag of the VCC timer monitoring table (see FIG. 29) held by the ATM switch 72a is set to non-monitoring (FIG. 27; step 133). Number [001
9] to [0022], the paragraph number [005]
7], and the same processing as [0031] to [0034] is performed.

Next, the VCC release sequence when the VCC monitoring timer times out (see FIG. 25) will be described. When the VCC monitoring timer set in the outgoing side ATM switch 72a times out (FIG. 26: step 401), the timed out VCC is deleted from the destination side switch-VCC correspondence table 2a (step 402). Similarly, the VCC that has timed out is deleted from the VCI-VCC correspondence table 2b (same; step 403).
From the VCC timer monitoring table, find out which VC has timed out.
The entry of C is deleted (same as step 404). After the above processing is completed, the VPI / VCI of the VCC to be released is designated, and the VCC release signal is transmitted to the relay ATM switch 72b (same as step 405).

The ATM switch 72b that has received the VCC release signal (FIG. 25; 94a) (FIG. 26; step 406) uses the VCI-VCC correspondence table 2b to determine the V to be released.
The CC is deleted (same; step 407). Next, relay A
The VCC to be released is deleted from the header conversion table 5a held by the TM exchange 72b (Step 40).
8). After the above processing is completed, the VPI of the VCC to be released
Specify the VCI and transmit a VCC release signal to the destination ATM exchange 72c (same as step 409).

The receiving side ATM switch 72 receives the VCC release signal (FIG. 25; 94b) (FIG. 26; step 410).
In step c, the VCC to be released is deleted from the destination exchange-VCC correspondence table 2a (step 411). Similarly, the designated VCC is deleted from the VCI-VCC correspondence table 2b (same; step 412). As a result of the above processing, the relay connection VCC 74a set in the ATM exchanges 72a-72b-72c is released.

As described above, the paragraph numbers [0036] to [004]
According to the embodiment of the present invention described in 3), the VCC setting / release command is to provide the setting / release of the high-speed connection without adding a new function by using the function of the PVC command. Setting / cancellation of the relay connection can be realized. Also, paragraph numbers [0044] to
According to the other embodiment of the present invention described in [0062], it is possible to set a VCC between arbitrary ATM exchanges without explicitly setting a VCC between arbitrary ATM exchanges in advance. Further, by monitoring the set VCC with a timer, it is possible to prevent the unused VCC from remaining and to use the connection resources effectively.

[0064]

According to the present invention, the amount of processing at each exchange,
In particular, the processing amount related to the header conversion table setting is reduced,
It can improve the call processing capability of the exchange and reduce the connection delay, and does not require the hardware to send and receive special signals for connection setup, and is applicable to large-scale networks and interconnected networks. A connection setting method and a connection setting device capable of performing the above can be realized. Further, according to the present invention, V ATM is explicitly specified in advance between any ATM exchanges.
CC can be set. Conversely, it is possible to set VCC between arbitrary ATM exchanges without explicitly setting VCC in advance.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-speed connection setting device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a network configuration according to an embodiment of the present invention.

FIG. 3 is a signal sequence diagram in the embodiment of the present invention.

FIG. 4 is a flowchart showing processing of the ATM exchange when a connection setting request is made in the embodiment of the present invention.

FIG. 5 is a flowchart showing processing of the ATM exchange at the time of a connection setting response in the embodiment of the present invention.

FIG. 6 is a flowchart showing processing of the ATM exchange when releasing a connection in the embodiment of the present invention.

FIG. 7 shows an originating ATM switch 72 according to an embodiment of the present invention.
FIG. 6 is a diagram showing an example of a destination exchange-VCC correspondence table 2a held by a.

FIG. 8 shows a transit ATM switch 72 in an embodiment of the present invention.
FIG. 4 is a diagram showing an example of a VCI-VCC correspondence table 2b held by the terminal b.

FIG. 9 shows a destination ATM switch 72 in an embodiment of the present invention.
FIG. 4 is a diagram showing an example of a VCI-VCC correspondence table 2b held by c.

FIG. 10 shows an originating ATM switch 7 in an embodiment of the present invention.
FIG. 4 is a diagram illustrating an example of a VP band management table 3a held by 2a.

FIG. 11 shows an example of each ATM exchange (7
It is a figure which shows an example of the accommodation terminal-exchange apparatus correspondence table 4a which 2a-72c) hold | maintains.

FIG. 12 shows a transit ATM exchange 7 in an embodiment of the present invention.
FIG. 4 is a diagram showing an example of a header conversion table 5a held by 2b.

FIG. 13 is a detailed view of an ATM exchange for implementing the present embodiment.

FIG. 14 is a detailed view of an ATM exchange for implementing the present embodiment.

FIG. 15 is a flowchart showing a process of a subscriber ATM exchange when setting a relay connection in the embodiment of the present invention.

FIG. 16 is a flowchart showing a process of the relay ATM exchange at the time of setting a relay connection in the embodiment of the present invention.

FIG. 17 is an ATM switch 72a according to the embodiment of the present invention.
-Side ATM exchange-VCC correspondence table 2a owned by the company
It is a figure showing an example of.

FIG. 18 is an ATM switch 72a according to the embodiment of the present invention.
FIG. 5 is a diagram showing an example of a VCI-VCC correspondence table 2b held by the.

FIG. 19 is an ATM switch 72b according to an embodiment of the present invention.
FIG. 5 is a diagram showing an example of a VCI-VCC correspondence table 2b held by the.

FIG. 20 shows an ATM switch 72b according to an embodiment of the present invention.
FIG. 6 is a diagram showing an example of a header conversion table 5a held by the.

FIG. 21 is an ATM switch 72c according to the embodiment of the present invention.
-Side ATM exchange-VCC correspondence table 2a owned by the company
It is a figure showing an example of.

FIG. 22 illustrates an ATM switch 72c according to an embodiment of the present invention.
FIG. 5 is a diagram showing an example of a VCI-VCC correspondence table 2b held by the.

FIG. 23 is a flowchart showing a process of the subscriber ATM exchange when the relay connection is released in the embodiment of the present invention.

FIG. 24 is a flowchart showing a process of the relay ATM exchange at the time of releasing the relay connection in the embodiment of the present invention.

FIG. 25 is a signal sequence diagram in the embodiment of the present invention.

FIG. 26 is a flowchart showing processing in the ATM exchange when the VCC monitoring timer times out in the embodiment of the present invention.

FIG. 27 is a flowchart showing processing in the ATM exchange when receiving a call setting request signal in the embodiment of the present invention.

FIG. 28 is a flowchart showing processing in the ATM exchange when receiving a call release signal in the embodiment of the present invention.

FIG. 29 shows an originating ATM switch 7 in an embodiment of the present invention.
FIG. 4 is a diagram illustrating an example of a VCC timer monitoring table held by 2a.

FIG. 30 is an ATM switch 72a according to the embodiment of the present invention.
-Side ATM exchange-VCC correspondence table 2a owned by the company
It is a figure showing an example of.

FIG. 31 shows an ATM switch 72b according to an embodiment of the present invention.
-Side ATM exchange-VCC correspondence table 2a owned by the company
It is a figure showing an example of.

FIG. 32 illustrates an ATM switch 72c according to an embodiment of the present invention.
-Side ATM exchange-VCC correspondence table 2a owned by the company
It is a figure showing an example of.

[Explanation of symbols]

 1: ATM exchange 2: VCC management unit 2a: Destination exchange-VCC correspondence table 2b: VCI-VCC correspondence table 3: Band management unit 3a: VP band management table 4: Accommodation terminal management unit 4a: Accommodation terminal-exchange correspondence table 5: Switch unit 5a: Header conversion table 6: Command receiving unit 7: Maintenance operation unit 8: Timer monitoring unit 71a, 71b: Subscriber terminal 72a to 72c: ATM exchange 73a to 73d: Transmission link 74a: Virtual channel connection (VCC) 91a-91d: Call setting request signal 92a-92d: Call setting response signal 93a-93d: Call release signal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Shiraishi 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Hiroshi Yao 3-192-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Japan Telegraph and Telephone Corporation

Claims (8)

[Claims] 1. An ATM communication network comprising a plurality of ATM exchanges and a plurality of network elements such as subscriber terminals or other networks accommodated in these ATM exchanges. A method for setting up and releasing a high-speed connection in an SVC service for setting up a connection, wherein a VCC in which a band is not secured between any ATM exchanges is previously set as a relay connection, and a calling side that accommodates a subscriber or another network. ATM switch and destination AT
V captured on the subscriber side or other network side in the M exchange
C. A high-speed connection setup / release method characterized in that connection setup / release is performed by connecting / disconnecting a relay connection set between the originating ATM exchange and the destination ATM exchange. When a connection is set up and released, a signal used in a normal SVC service is transferred to a link-by-link, so that the connection setting and the bandwidth management for the relay connection part are performed in the same manner as the normal SVC service.
A high-speed connection setting / release method characterized by performing release. 2. The high-speed connection setting according to claim 1,
A high-speed connection setting / release device for realizing a release method, comprising: a VCC management unit for managing a VCC preset between arbitrary ATM exchanges; a bandwidth management unit for managing a VP band; Terminal and AT accommodating it
A high-speed connection setup / release device comprising: an accommodation terminal management unit that manages a correspondence relationship with an M exchange; and a switch unit that connects and disconnects a connection. 3. The high-speed connection setting according to claim 2,
In the release device, the VCC management unit manages a correspondence relationship between the ATM switch and the VCC and a use state of the VCC with respect to a VCC set in advance between any ATM switches, and uses the ATM switch as a search key to set the ATM switch. Search for a VCC that is not in use from among the preset VCCs for
A destination exchange-VCC correspondence table providing a function of acquiring a transmission link number and a VPI / VCI of a corresponding VCC, and a predetermined VCC,
And the VPI of the transmission link of one of the VCs
-The transmission link number and VPI of the VCI and the other VC
Manages the correspondence with VCI, and sets the transmission link number and V
VC set in advance using PI / VCI as a search key
VC that provides a function of searching for C and acquiring the transmission link number and VPI / VCI of the other VC of the corresponding VCC
An I-VCC correspondence table, wherein the bandwidth management unit has a VP bandwidth management table that manages a VP idle bandwidth for each VPI of a transmission link, and the accommodating terminal management unit includes an ATM accommodating a subscriber terminal. A switching unit that manages the correspondence between the exchanges and provides a function of searching for an ATM exchange accommodating the subscriber terminal by using the subscriber terminal as a search key; V in cell header
A high-speed connection setup / release device having a header conversion table for providing a function of changing PI and VCI according to a set connection. 4. An arbitrary AT as the relay connection
The setting of VCC where the bandwidth is not secured between M exchanges is as follows:
From the maintenance and operation device provided for the ATM communication network, the ATM
2. The high-speed connection setup / release method according to claim 1, wherein the setting is performed by transmitting a VCC setting command to the exchange, and the release of the set VCC is performed by transmitting a VCC release command. To set and release a relay connection for 5. An arbitrary AT as the relay connection
The setting of VCC where the bandwidth is not secured between M exchanges is as follows:
Of the VCCs between the originating and terminating subscribers set in the normal SVC service for transferring the connection setting signal to the link-by-link, the VCC between the originating ATM exchange and the terminating ATM exchange is changed even after the termination of the SVC service. Is held without being released as the VCC of the relay connection that is not secured, and the S
2. The relay connection for realizing the high-speed connection setup / release method according to claim 1, wherein the VCC of the held relay connection is used for an SVC service passing through the same relay route as the VC service. Setting method. 6. In a VCC of a relay connection which is maintained without being released even after termination of the SVC service, the SV
When the elapsed time from the end of the C service to the next use by the next SVC service exceeds a preset time, the VCC of the held relay connection is released. A relay connection release method for realizing the high-speed connection setup / release method according to claim 5. 7. The high-speed connection setting according to claim 2,
The release device receives and analyzes the VCC setting command or the VCC release command transmitted from the maintenance operation device provided for the ATM communication network, and the specified band is not reserved for the VCC management unit. A high-speed connection setup / release device comprising a command receiving unit for setting or releasing VCC. 8. The high-speed connection setting according to claim 2,
The release device monitors, for the VCC of the relay connection according to claim 5, an elapsed time from the end of the SVC service until it is used again by an SVC service provided thereafter, and the elapsed time is set in advance. A timer monitoring unit for requesting the VCC management unit to release the VCC of the relay connection when the time exceeds the set time.
Release device.