JP2001127772A - Atm network system, its central control system and atm switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ATM network system where setup is conducted at a high-speed. SOLUTION: On request of hand-over, a central control station 1 transmits a local path selection request message 110 to a central control station 2 and a setup remote control message 101 is sent to an ATM switch 4b being a crossover switch. The ATM switch 4b transmits a setup message 102 to a boundary ATM switch 4z. The central control station 2 selects a local path in a pier group X. 2, transmits a local path selection result message 111 to the boundary ATM switch 4z to aid rewrite of a path designation list of a setup message 102. Furthermore, an ATM switch 4e built in a base station 3B transmits a tentative setup message 120 to allow a switch 4d to conduct reservation of a resource with respect to a call and setup of connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call control system (CCS) for a plurality of groups.
oll Station) and multiple ATMs (Asynchronous Tran
(sfer Mode: Asynchronous transfer mode) This relates to call setting of the ATM network system to which the switch belongs. For example, it is composed of a central control station, an ATM switch, a base station, a mobile terminal, etc., which centrally perform rerouting at the time of handover, selection of an optimal crossover switch and route, remote control for establishing a spare connection, and the like. The present invention relates to an appropriate call setting used for setting a new route at the time of handover between groups in a mobile ATM network system.

[0002]

2. Description of the Related Art With reference to FIGS. 9 to 12, a call setting operation for a new route accompanying a handover between groups in a conventional mobile ATM network system will be described. FIG. 9 is a system configuration diagram of a conventional mobile ATM network system. The mobile ATM network system is an AT that is the backbone of mobile radio communication.
M network system. Mobile ATM shown
The network system is a private ATM (Privat
e Asynchronous Transfer Mode) network. For example, UNI (User-Network Inter
face) Using 4.0, each ATM switch 4a-4e, 4
Between z, PNNI (Private Network-Network Interface)
e) Connect using the 1.0 protocol. In PNNI, A
A plurality of physical nodes such as the TM switches 4a to 4e and 4z are gathered to form the lowest layer peer group X.TM. 1, X. 2,
...

[0003] A backbone network for mobile radio communication is constructed simply by providing one centralized control station and one or a plurality of base stations having a built-in ATM switch and mutually connecting with one or a plurality of ATM switches. See, for example, Takahashi, Shinagawa, Kobayashi, "Multiple Reserved Connection Schemes in Mobile ATM Networks", IEICE RCS98-176, (1999-01), IEICE, p.
p.53-60, Takahashi, Shinagawa, Kobayashi "Route switching in mobile ATM networks", IEICE CS99-95, (1999-
09), which is known in IEICE, pp.75-80 and so on. However, these mobile networks are not layered by peer groups.

On the other hand, in the conventional example shown in the figure, one central control station 1, a plurality of ATM switches 4a, 4b, 4c and a communication partner terminal 6 are connected to one peer group X. Make up 1
One central control station 2 and a plurality of ATM switches 4z, 4
d, 4e is another peer group X.d. Constituting No. 2.
The ATM switches 4c and 4e are connected to the base stations 3A and 3A, respectively.
3B is an ATM switch in 3B. One centralized control station is arranged in one peer group, but the number of base stations installed in one peer group is not limited. ATM
The switch 4z is connected to another peer group X. 1 to peer group X. 2 is an ATM switch serving as an entrance to 2. In the following description, the ATM switch 4z is referred to as a boundary ATM switch to distinguish it from other ATM switches. Note that the ATM switch 4b is an exit-side boundary ATM switch.
Called a switch.

[0005] Peer groups are hierarchically constructed.
That is, the plurality of lowest-layer peer groups X. 1, X. 2,... Are constituent elements of a peer group in the next higher hierarchy (level). A plurality of peer groups in the next higher hierarchy are collected to form a peer group in the next higher hierarchy. At the higher hierarchical level, the peer group of the next lower hierarchy is regarded as one logical node. In one peer group, there is a peer group leader that is representative of the entire peer group. This peer group leader acts as a logical node. For example, when transmitting the topology information of the network configuration in the peer group of the next higher hierarchy, the peer group leader performs "summarization of addresses" and "aggregation of links" to obtain information necessary for packets of the topology protocol. The amount has been reduced as much as possible. Also, in a network system using the PNNI protocol, when a terminal originates a call, the ATM switch on the calling side uses a routing list (DT) based on its own topology information database.
L: Create a Designated Transit List, and call set
up) Attach it to the message 102 and send it.

In the illustrated example, the central control stations 1 and 2 become peer group leaders, and belong to respective peer groups X. 1, X. The topology information relating to No. 2 is transmitted to the other central control station 2 or 1 by performing “summarizing addresses” and “aggregating links”. Peer group X.
1, X. All the ATM switches constituting each of 2 have topology information in each layer. However,
Since the topology information is summarized and transmitted with respect to the peer group to which the user belongs, and the other peer groups, X. 1, X. It has only rough information such as 2. Note that any ATM switch forming the peer group may function as a peer group and central control station. In such a case, there is a method of automatically determining a peer group and a central control station by an election.

[0007] In a general private ATM network system, the connection route is rarely changed during communication between two terminals. However, in a mobile ATM network system, a mobile terminal may move across a peer group while communicating with a communication partner terminal. In such a case, it is necessary to set up a call for a new route after the handover. However, there is a problem that high-speed handover cannot be performed because the call setting process takes time.

Hereinafter, a call setting process for a new route after a handover in a conventional mobile ATM network system will be described. In FIG. 9, the mobile terminal 5 is currently communicating with the communication partner terminal 6 via the ATM switch 4c, the ATM switch 4a, and the ATM switch 4b of the base station 3A. When the mobile terminal 5 moves away from the base station 3A and approaches the base station 3B, the mobile terminal 5
“Handover request message” 10 via base station 3A
0 is transmitted to the central control station 1.

FIG. 10 is a call setting sequence diagram for a conventional new route. The “handover request message” 100 transmitted from the mobile terminal 5 is transmitted to the ATM switch 4
The signal is received by the centralized control station 1 via the terminals c and 4a. The central control station 1 has a global peer group X. 1 to X. 2 and a peer group X. 1. A local call path within 1 is selected, and a "call setting remote control message" 101 having call information is transmitted to the ATM switch 4b via the ATM switch 4a. Here, the call information is information on a call such as a band such as a maximum cell rate (PCR), a cell loss rate, a maximum cell transfer delay, and a peak-to-peak cell delay fluctuation. Have been. In the example shown, the ATM switch 4
b is a crossover switch (CO) which is a branch point between the current route to the communication partner terminal 6 (old route) and the new route.
S: Cross Over Switch). The ATM switch 4b serves as a starting point for call setting for a new route after the handover.

The ATM switch 4b rewrites the routing list (DTL) of the “call setup remote control message” 101 into a format that can be used in the “call setup message” 102. Further, based on the call information included in the “call setting remote control message” 101, resource reservation and connection establishment for the call are performed. When resource reservation and connection establishment for the call are completed, the peer group X. A "call setup message" 102 is transmitted to the second boundary ATM switch 4z. ATM switch 4b
The routing list included in the “call setup message” 102 transmitted by the peer group X. 1 to the ATM switch belonging to 1 (however, in the illustrated example, the ATM switch 4b
Thereafter, the peer group X. 1 is not described in detail. However, peer group X. 2 to the ATM switch belonging to the peer group X.2. Only 2 is described.

For this reason, the ATM switch 4z is connected to the peer group X. 2 "call setup message" sent to
102, and receives the peer group X.102. 2 rewrites the routing list included in the “call setup message” 102 by a method of selecting a local route inside and adding the selected local route. Of course, the current transit pointer, one of the information elements of the routing list, is also rewritten. On the other hand, based on the call information included in the “call setting message” 102, resource reservation and connection establishment for the call are performed. When these are completed, the ATM switch 4z
Sends the “call setup message” 102 to the ATM switch 4
d.

The ATM switch 4d rewrites the current transit pointer in the routing list of the "call setup message" 102. Also, a “call setup message” 1
Based on the information of the call 02, the resource reservation and the connection establishment for the call are performed. When these are completed, the ATM
The switch 4d sends the “call setup message” 102 to the AT
It transmits to the M switch 4e. This ATM switch 4e is the ATM of the end point for the new route after the handover.
Become a switch.

Thereafter, it is necessary to execute more communication procedures until the mobile terminal 5 resumes communication with the communication partner terminal 6 via the ATM switch 4e built in the base station 3B. And various methods have been proposed.
Here, only an outline of an example will be described. The ATM switch 4e built in the base station 3B rewrites the current transit pointer in the routing list included in the "call setup message" 102, as well as the ATM switch 4d, and performs resource reservation and connection establishment for the call. When they are completed, a "call setup message" 102
Is transmitted to a pseudo terminal (not shown) built in the base station 3B. When the "call setup message" 102 arrives at the pseudo terminal, a CONNECT message is sent along the reverse route to the ATM switch 4b, which is a crossover switch, and call setup for the new route after the handover is performed. Complete.

The above-described call setting for a new route after the handover corresponds to establishment of a backup connection in handover control. After the establishment of the backup connection, the mobile terminal 5 sends a “route switching request message” to the central control station 1.
, The central control station 1 causes the ATM switch 4b to release the connection of the old route and to enable the backup connection to be communicable. Communication with the communication partner terminal 6 is enabled. The mobile terminal 5 is connected to the base station 3B
A "handover complete message" is transmitted to the built-in ATM switch 4e, and communication is resumed.

Here, the functional block configuration of the conventional ATM switches 4a to 4e and 4z and the functional block configuration of the central control station 1 shown in FIG. 9 will be described. FIG.
Are the conventional ATM switches 4a to 4e, 4 shown in FIG.
It is a functional block diagram of z. The illustrated functional block configuration illustrates the functions performed by the ATM switches 4a to 4e and 4z at the time of call setting, and omits functions not related to the call setting processing. FIG. 12 is a functional block diagram of the conventional centralized control station 1 shown in FIG. Functions not related to the call setting process are omitted. In addition,
The central control station 2 does not have any special involvement in the call setting process, and a description thereof will be omitted. Of course, if the central control station 2 becomes the side that receives the handover request from the mobile terminal 5, the call setting process is performed with the functional block configuration shown in FIG.

The functions performed by the ATM switches 4a to 4e and 4z differ depending on the position of a logical node on the network system, the path of the current path and the path after path switching, and the like. Therefore, it has a common hardware configuration and software configuration, and is designed so that all functions can be executed, and only the functions that each ATM switch needs to execute are executed. Further, the central control station and A
It is also possible to have both the hardware configuration and the software configuration of the TM switch so that any function is designed to be executable and only one of the assigned functions is executed. For the sake of simplicity, in addition to the ATM cell switch, the ATM cell transmission / reception function unit 41 includes an ATM cell switch, which is described later, when switching from an input port to an output port.
A routing table for rewriting the VPI and VCI of the cell is included. Therefore, the function of merely passing a message from an input port to an output port, etc., is performed in the ATM cell transmission / reception function unit 41, and detailed description is omitted.

First, the ATM switch 4 built in the base station 3A
c, the ATM cell transmission / reception function unit 41 inputs the "handover request message" 100 from the mobile terminal 5 and outputs it to the ATM switch 4a. ATM switch 4
a, the ATM cell transmitting / receiving function unit 41 transmits the above-described “handover request message” 100 to the central control station 1
And outputs a “call setting remote control message” 101 from the central control station 1 to the ATM switch 4b.

In the central control station 1 shown in FIG. 12, a "handover request message" 100 is received by the handover request message receiving function unit 12 via the ATM cell transmitting / receiving function unit 11. The handover request message receiving function unit 12 outputs a handover request to the global route selection function unit 13. The global route selection function unit 13 selects a global route based on an address for identifying a handover destination base station, call information, and a database of topology information. The selection result is
Output to the local route selection function unit 14. In this local route selection function unit 14, the peer group X. 1 based on its ATM switch egress address, call information, and topology information database. 1 is selected and output to the route specification list creation function unit 15 together with the global route. The routing list creation function unit 15 creates a routing list and outputs it to the call setting remote control message transmission function unit 16. The call setting remote control message transmitting function unit 16 creates a "call setting remote control message" 101 having a routing list and information on the call recognized by the central control station 1, and sends it to the ATM cell transmitting / receiving function unit. 11 to the ATM switch 4a. In addition, peer group X. A belonging to 2
Information for specifying the TM switch 4e, for example, an address for identifying the above-mentioned handover destination base station 3B,
"Call setting remote control message" 101 is provided.

The ATM switch 4b will be described with reference to the block configuration of the ATM switch shown in FIG.
In the illustrated example, since the ATM switch 4b is a crossover switch, the "call setting remote control message" 101 is received by the call setting remote control message receiving function unit 42 via the ATM cell transmitting / receiving function unit 41. The call setting remote control message receiving function unit 42 outputs the routing list included in the “call setting remote control message” 101 to the routing list rewriting operation function unit 45, and also outputs the “call setting remote control message” 101.
It outputs the information of the call held by to the resource reservation function unit 47 and the connection establishment control function unit 48 regarding the call. The routing list rewriting operation function unit 45 rewrites the routing list and outputs it to the call setting message transmission function unit 44. The resource reservation function unit for call 47 makes a resource reservation for call to the ATM cell transmission / reception function unit 41, and the connection establishment control function unit 48 establishes a connection to the ATM cell transmission / reception function unit 41.

Here, the resource reservation for a call refers to, for example, a port number and a VPI (Virtual Path Ide) for a VC (Virtual Channel) for which a call is to be set.
ntifier: virtual path identifier), VCI (Virtual Channel
After determining an Identifier (virtual channel identifier) and the like, bandwidth reservation such as PCR (Peak Cell Rate: maximum cell rate) of the VC is performed. In addition, connection establishment refers to, for example, setting of switching hardware after determining the above-described port number, VPI, VCI, etc. for a VC for which a call is to be set. In FIG. 11, the resource reservation function unit 47 and the connection establishment control function unit 48 relating to the call are shown as independent functions, but the port number, VPI, VC
Until I is determined, it is a function common to both.
Therefore, if one of the two performs the function, the other can use the result.

In the illustrated example, the ATM switch 4b is connected to the peer group X. 1 is a boundary ATM switch on the output side. When the resource reservation and connection establishment for the call are completed, the call
Via the M cell transmission / reception function unit 41, the peer group X. 2
A "call setting message" 102 is transmitted to the boundary ATM switch 4z.

Next, the boundary ATM switch 4z is
This will be described using the block configuration of the ATM switch shown in FIG. The “call setting message” 102 is controlled so as to be received by the call setting message receiving function unit 43 via the ATM cell transmitting / receiving function unit 41. The call setting message receiving function unit 43 includes a “call setting message” 102
The routing list held by the local routing function unit 46
And the call information contained in the “call setup message” 102 is output to the local route selection function unit 46, the resource reservation function unit 47 for the call, and the connection establishment control function unit 48. The contents of the “call setting message” 102 other than the routing list are output to the call setting message transmitting function unit 44.

The local route selection function unit 46 has a routing list in which a global route is described, an address for identifying a handover destination base station, call information, and topology information of the “call setup message” 102. Based on the database, peer group X. 2 Select a detailed route inside,
Output to the routing list rewriting operation function unit 45. The routing list rewriting operation unit 45 rewrites the routing list included in the “call setting message” 102,
It outputs to the call setting message transmission function unit 44. On the other hand, the resource reservation function unit 47 for the call makes a resource reservation for the call to the ATM cell transmission / reception function unit 41, and the connection establishment control function unit 48 provides the ATM cell transmission / reception function unit 4
1 is established. When these operations are completed, the call setting message transmitting function unit 44 transmits a “call setting message” 102 to the ATM switch 4d via the ATM cell transmitting / receiving function unit 41.

Next, the ATM switch 4d will be described using the block configuration of the ATM switch shown in FIG.
The “call setting message” 102 is received by the call setting message receiving function unit 43 via the ATM cell transmitting / receiving function unit 41. The call setting message receiving function unit 43 outputs the routing list included in the “call setting message” 102 to the routing list rewriting operation function unit 45,
The call information contained in the "call setup message" 102 is output to the resource reservation function unit 47 and the connection establishment control function unit 48 related to the call, and the contents of the "call setup message" 102 other than the routing list are transmitted to the call setup message transmission function. Output to the unit 44.

The route list rewriting operation function unit 45
Rewrites the current transit pointer in the routing list of the “call setup message” 102 and outputs it to the call setup message transmission function unit 44. The resource reservation function unit 47 relating to the call sends the ATM cell transmission / reception function unit 41
A resource reservation for a call is made, and the connection establishment control function unit 48 establishes a connection with the ATM cell transmission / reception function unit 41. Call setting message transmission function unit 44
When these are completed, the ATM cell transmission / reception function unit 41
, The “call setting message” 102 is transmitted to the ATM switch 4e built in the base station 3B.

The ATM switch 4e built in the base station 3B is
As in the case of the ATM switch 4d, the "call setup message" 1
02, the call setting message receiving function unit 43, the routing specification list rewriting operation function unit 45, the call setting message transmitting function unit 44, the resource reservation function unit 47 for the call, and the connection establishment control function unit 48 are operated. A call setup message 102 is transmitted to the pseudo terminal built in the base station 3B.

As described above, in the conventional mobile ATM network system, the AT of the central control station 1 side
M switch 4a, 4b is connected to peer group X. For the route to one ATM switch, a local route is described in detail. However, other peer groups X. 2
For example, the route to the ATM switch can be described only globally. Therefore, the "call setup message"
The routing list attached to 102 contains the boundary AT
In the M-switch 4z, again a detailed local path to the ATM switch has to be specified. That is, at the time of path switching performed at the time of handover, the boundary A
It takes time to perform a local path selection operation performed by the TM switch. On the other hand, the boundary ATM located on the new route
In the switch 4z, the ATM switch 4d, and the ATM switch 4e built in the base station 3B, the call setting message 102 is transmitted along the new route, and the call such as resource reservation and connection establishment for the call is sequentially transmitted to the ATM switch. The setting process must be performed. Therefore, there is also a problem that it takes time for resource reservation and connection establishment for a call performed in each ATM switch on the new route.

[0028]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an ATM network system capable of performing a call setting process at a high speed.
Central control station of TM network system and AT
An object of the present invention is to provide an ATM switch for an M network system.

[0029]

According to the present invention, a centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group belongs to a plurality of groups. When a control station transmits a call setup message from a first ATM switch belonging to the first group to the second ATM switch belonging to a second group, the control station transmits the call setup message in advance to the first group. An ATM network system for transmitting global route information and call information from a central control station belonging to the second group to the second group,
The central control station belonging to the second group receives the information of the global route and the information of the call, and selects a local route in the second group. Each A along a local path in the second group
The TM switch transmits the call setup message to the second ATM switch along a local route in the selected second group.

Further, in the invention described in claim 2,
A centralized control station and a plurality of ATM switches belong to the plurality of groups, respectively, and the centralized control station belonging to the first group is assigned to a first AT belonging to the first group.
When transmitting a call setup message from the M-switch to the second ATM switch belonging to the second group, information on a global route from the first group to the second group is stored in advance. And ATM for transmitting call information to a central control station belonging to the second group
A central control station of a network system, wherein the receiving unit receives the information of the global route and the information of the call;
Means for selecting a local route in the second group; and each ATM switch along the local route in the selected second group,
And a control unit for transmitting the signal to the second ATM switch along a local route in the selected second group, and functioning as a central control station belonging to at least the second group. Is what you do.

According to the third aspect of the present invention,
A centralized control station and a plurality of ATM switches belong to the plurality of groups, respectively, and the centralized control station belonging to the first group is assigned to a first AT belonging to the first group.
When transmitting a call setup message from the M-switch to the second ATM switch belonging to the second group, information on a global route from the first group to the second group is stored in advance. And ATM for transmitting call information to a central control station belonging to the second group
An ATM switch for a network system, wherein said call setup message is transmitted to said second ATM switch along a local path in a second group selected by a central control station belonging to said second group. And functions as an ATM switch along at least a local route in the selected second group.

Therefore, according to the first to third aspects of the present invention, the ATM switch along the local path in the selected second group is selected by the central control station belonging to the second group. Since the call setting process is performed using the local route in the second group, the call setting process can be performed at a higher speed than when the call setting process is performed only after receiving the call setting message.

According to the fourth aspect of the present invention, the central control station and the plurality of ATMs are respectively assigned to the plurality of groups.
A central control station belonging to a first group, to which a switch belongs, sends a call setup message from a first ATM switch belonging to the first group to the second ATM switch belonging to a second group. When sending
The global route information and the call information from the first group to the second group are previously stored in the second group.
An ATM network system for transmitting data to a central control station belonging to the second group, wherein the central control station belonging to the second group receives the global route information and the call information, Within the second group, and information on the selected local route in the second group is assigned to a boundary AT belonging to the second group.
M switch, and the boundary AT
The M switch receives the information of the local path in the selected second group and the call setup message, and, upon receiving the call setup message, the M switch, The information of the local route in the group 2 is provided, and the call setup message is
And transmitting to the ATM switch along a local path in the selected second group.

Further, in the fifth aspect of the present invention,
A centralized control station and a plurality of ATM switches belong to the plurality of groups, respectively, and the centralized control station belonging to the first group is assigned to a first AT belonging to the first group.
When transmitting a call setup message from the M-switch to the second ATM switch belonging to the second group, information on a global route from the first group to the second group is stored in advance. And ATM for transmitting call information to a central control station belonging to the second group
A central control station of a network system, wherein the receiving unit receives the global route information and the call information; a selecting unit that selects a local route in the second group; It has a transmission unit for transmitting information on a local route in the second group to the boundary ATM switch belonging to the second group, and functions at least as a central control station belonging to the second group.

In the invention according to claim 6,
A centralized control station and a plurality of ATM switches belong to the plurality of groups, respectively, and the centralized control station belonging to the first group is assigned to a first AT belonging to the first group.
When transmitting a call setup message from the M-switch to the second ATM switch belonging to the second group, information on a global route from the first group to the second group is stored in advance. And ATM for transmitting call information to a central control station belonging to the second group
An ATM switch for a network system, the receiving unit receiving information on a local route in the selected second group selected and transmitted by a central control station belonging to the second group; A call setup message is received, and the call setup message is provided with information on a local route in the selected second group, and the call setup message is transmitted to the selected second group. It has a transmitting / receiving unit for transmitting to the ATM switch along a local route, and functions at least as the boundary ATM switch.

Therefore, according to the invention set forth in claims 4 to 6, when the boundary ATM switch receives the call setup message, the local routing operation in the second group can be omitted. , A call setup message can be sent to the ATM switch along a local path within the selected second group in a short processing time. Therefore, the call setting process can be performed at high speed.

According to the present invention, a central control station and a plurality of ATMs are respectively assigned to a plurality of groups.
A central control station belonging to a first group, to which a switch belongs, sends a call setup message from a first ATM switch belonging to the first group to the second ATM switch belonging to a second group. When sending
The global route information and the call information from the first group to the second group are previously stored in the second group.
An ATM network system for transmitting data to a central control station belonging to the second group, wherein the central control station belonging to the second group receives the global route information and the call information, And transmitting the information of the selected local path in the second group and the information of the call to the second ATM switch. The ATM switch receives the information of the local path in the selected second group and the information of the call, performs resource reservation for the call, and performs the local reservation in the selected second group. The route information and the call information are transferred along a local A route in the selected second group in the reverse direction A.
This is transmitted to the TM switch.

According to the present invention, a central control station and a plurality of ATMs are assigned to a plurality of groups, respectively.
A central control station belonging to a first group, to which a switch belongs, sends a call setup message from a first ATM switch belonging to the first group to the second ATM switch belonging to a second group. When sending
The global route information and the call information from the first group to the second group are previously stored in the second group.
A central control station of an ATM network system for transmitting to a central control station belonging to the group of: a receiving unit for receiving the global route information and the call information;
And a transmitting unit that transmits the information of the selected local route in the second group and the information of the call to the second ATM switch. And functions as a central control station belonging to the second group.

According to the ninth aspect of the present invention, the central control station and the plurality of ATMs are respectively assigned to the plurality of groups.
A central control station belonging to a first group, to which a switch belongs, sends a call setup message from a first ATM switch belonging to the first group to the second ATM switch belonging to a second group. When sending
The global route information and the call information from the first group to the second group are previously stored in the second group.
An ATM switch of an ATM network system for transmitting to a central control station belonging to the group of the second group, wherein the local switch in the selected second group selected and transmitted by the central control station belonging to the second group. A receiving unit that receives the information of the route and the information of the call, a resource reservation unit that makes a resource reservation for the call, and information of the local route in the selected second group and the information of the call. It has a transmitting unit for transmitting to the ATM switch in the reverse direction along the local path in the selected second group, and functions at least as the second ATM switch.

According to the tenth aspect of the present invention, the central control station and the plurality of ATs are respectively assigned to the plurality of groups.
A central control station belonging to a first group, which transmits a call setup message from the first ATM switch belonging to the first group to the second ATM switch belonging to a second group. An ATM network system for transmitting, in advance, information on a global route from the first group to the second group and call information to a central control station belonging to the second group Wherein the centralized control station belonging to the second group receives the global route information and the call information, selects a local route in the second group, and selects the selected local route. Transmitting the information of the local route in the second group and the information of the call to the second ATM switch, wherein the second ATM switch is configured to transmit the selected ATM switch; Receiving the information of the local route in the second group and the information of the call, and establishing a connection, and the information of the local route and the information of the call in the selected second group, A in the reverse direction along a local path in the selected second group
This is transmitted to the TM switch.

According to the eleventh aspect of the present invention, the central control station and the plurality of ATs are respectively assigned to the plurality of groups.
A central control station belonging to a first group, which transmits a call setup message from the first ATM switch belonging to the first group to the second ATM switch belonging to a second group. An ATM network system for transmitting, in advance, information on a global route from the first group to the second group and call information to a central control station belonging to the second group Receiving unit for receiving information on a local route in the selected second group and information on the call selected and transmitted by the central control station belonging to the second group. And a connection establishing unit for establishing a connection, and information on a local route and the information on the call in the selected second group, Has a transmission unit for transmitting in the opposite direction of the ATM switches along the topical route in the second group, and functions as at least a second ATM switch.

Therefore, according to the present invention, at least the second ATM switch is selected by the central control station belonging to the second group before receiving the call setup message. Using a local route in the second group, resource reservation and connection establishment for a call can be performed in advance, and call setting processing can be performed at high speed.

[0043]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A call setting process in a mobile ATM network system according to a first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a system configuration diagram of a mobile ATM network system according to a first embodiment of the present invention. As before, UNI4.0 is used for the protocol of the user / network interface, and the PNNI is connected between the ATM switches 4a to 4e and 4z.
Connect using the 1.0 protocol. The same reference numerals are assigned to the same parts as the arrangement on the network in the case of the conventional system configuration diagram of FIG. FIG. 2 shows the first embodiment of the present invention.
FIG. 10 is a call setting sequence diagram for a new route according to the embodiment. Similar to the conventional call setup sequence shown in FIG. 1 from the wireless zone of the base station 3A belonging to the peer group X. When the mobile station moves to the wireless zone of the base station 3B belonging to the base station 2, a “handover request message” 100 is transmitted to the central control station 1 via the base station 3A.

The central control station 1 according to this embodiment comprises:
Global Route and Peer Group X. 1. Select a local path within 1. However, unlike the past, after performing a global route selection, a "local route selection request message"
110 is transmitted to the central control station 2 via the ATM switches 4a, 4b, 4z, 4d. In addition, as in the prior art, “call setting remote control message” 101
And sends it to the ATM switch 4b, which is a crossover switch. When the resource reservation and the connection establishment for the call are completed, the ATM switch 4b starts the peer group X.3. A "call setup message" 102 is transmitted to the second boundary ATM switch 4z.

"Local route selection request message" 11
0 that has received the peer group X.0. 2, a local route is selected, and the result is set as a “local route selection result message” 111 and transmitted to the boundary ATM switch 4z via the ATM switch 4d. That is, the central control station 2 operates the boundary ATM switch 4
Supports the routing list rewriting operation of z. The boundary ATM switch 4z receives the “local path selection result message” 111 and re-routes the boundary ATM switch 4z, that is, the peer group X. A local route in 2 is previously selected. Thereafter, the boundary ATM switch 4z receives the “call setup message” 102. At this time, the peer group X. A local path inside 2 has already been selected. Therefore, the local route selection processing is omitted, and the routing list included in the “call setup message” 102 is immediately rewritten,
The "call setup message" 102 can be transmitted to the ATM switch 4d. Note that even when the “local route selection request message” 110 or the “local route selection result message” 111 cannot be received due to a network failure, when the “call setup message” 102 is received, The same call setting process can be performed.

Here, the ATM switch 4a shown in FIG.
4e and 4z, and the functional block configurations of the central control stations 1 and 2 will be described. FIG. 3 is a functional block diagram of the ATM switches 4a to 4e and 4z shown in FIG. FIG. 3 illustrates the functions performed by each ATM switch when setting up a call. Functions not related to the call setting process are omitted. Also, as in FIG. 11, a function executed only by a specific ATM switch is included. The conventional ATM switches 4a to 4e shown in FIG.
Parts similar to those of 4z are denoted by the same reference numerals. FIG.
FIG. 2 is a functional block diagram of centralized control stations 1 and 2 shown in FIG. 1. It illustrates the functions performed by the central control station at the time of call setting, and omits functions not related to the call setting processing. The same parts as those in the case of the conventional centralized control station 1 shown in FIG.

The ATM switch 4c built in the base station 3A is
It is the same as the conventional one. The ATM switch 4a is the same as the conventional one, but in addition to the "handover request message" 100 and the "call setting remote control message" 101, the ATM cell transmitting / receiving function unit 41 performs the "local route selection" from the central control station 1. A request message 110 is input and output to the ATM switch 4b.

The central control station 1 will be described with reference to the block diagram of the central control station shown in FIG. 12, the handover request message receiving function unit 12 receives the "handover request message" 100, and the call setting remote control message transmitting function unit 16 transmits the "call setting remote control message" 101. , Via the ATM cell transmission / reception function unit 11
The message is transmitted to the TM switch 4a. However, in the embodiment of the present invention, at the same time, the global route selection function unit 13
Outputs the global route selection result to the local route request message transmission function unit 17. The local routing request message transmitting function unit 17 creates the “local routing request message” 110 from the global routing result and information on the call for which call setting is to be performed, and executes the “call Prior to the “setting remote control message” 101, the “local route selection request message” 110 is transmitted to the ATM switch 4 via the ATM cell transmitting / receiving function unit 11.
Send to a.

The ATM switch 4b will be described with reference to FIG. First, in the ATM cell transmission / reception function unit 41, a “local route selection request message” 110 is input from the ATM switch 4a and output to the boundary ATM switch 4z. The ATM switch 4b is connected to the ATM switch 4 via the ATM cell transmission / reception function unit 41 as in the conventional case.
The “call setting remote control message” 101 input from the M switch 4 a is received by the call setting remote control message receiving function unit 42, and the “call setting message” 102 is received by the peer group X. 2 The routing list at this time contains the peer group X. 2 to the ATM switch belonging to the peer group X.2. 1 to peer group X.
Only 2 is described.

Next, the boundary ATM switch 4z will be described with reference to FIG. First, in the ATM cell transmission / reception function unit 41, a “local route selection request message” 110 is input from the ATM switch 4b and output to the ATM switch 4d. Further, the “local route selection result message” 111 is received by the local route selection result message receiving unit 49 from the ATM switch 4 d via the ATM cell transmitting / receiving function unit 41. The local routing result message receiving function unit 49 inputs the local routing result to the local routing function unit 46 and re-routes from the boundary ATM switch, that is, the peer group X. The local path in 2 is kept.

Thereafter, a “call setup message” 102
Is received by the call setting message receiving function unit 43 via the ATM cell transmitting / receiving function unit 41. Boundary ATM
In the switch 4z, the peer group X. A local path inside 2 has already been selected. Therefore, when the call setting message receiving function unit 43 outputs the routing list of the “call setting message” 102 to the routing list rewriting operation function unit 45, the routing list rewriting operation unit 45 Based on the already selected local route held in the function unit 46, the route specification list of the “call setup message” 102 is rewritten, and the current transit pointer is rewritten. In this way, local routing at the boundary ATM switch 4z can be omitted.

The call information contained in the "call setting message" 102 is input to the call-related resource reservation function unit 47 and the connection establishment control function unit 48 in the same manner as in the prior art. Is performed. If there is no failure in the network,
Since the local route selection support by the central control station 2 is normally performed, the local route selection function unit 46 does not need to perform a route selection operation and does not need to input call information. When the resource reservation and connection establishment for the call are completed, the call setting message transmitting function unit 44 transmits a “call setting message” 102 with the routing list rewritten to the ATM switch 4d.

Next, the ATM switch 4d will be described with reference to FIG. First, in the ATM cell transmission / reception function unit 41, a “local path selection request message” 110 is input from the boundary ATM switch 4z and output to the central control station 2. Further, the “local route selection result message” 111 is input from the central control station 2 and output to the boundary ATM switch 4z. After this, the "call setup message"
102 is received by the call setting message receiving function unit 43 via the ATM cell transmitting / receiving function unit 41. In this case, an operation similar to the conventional operation is performed. The call setting message transmitting function unit 44 transmits a “call setting message” 102 to the ATM switch 4e built in the base station 3B via the ATM cell transmitting / receiving function unit 41.

Next, the central control station 2 will be described with reference to FIG. "Local route selection request message" 11
0 is received by the local route selection request message receiving function unit 18 via the ATM cell transmitting / receiving function unit 11. The local route selection request message receiving function unit 18 outputs the global route selection result selected by the central control station 1 and call information to the local route selection function unit 14. The “local route selection request message” 110 has not only the selected global route information but also information of a call for which call setting is to be performed. When there are a plurality of base stations, an address or the like for identifying a handover destination base station may be provided. When there is one base station, it may or may not have an address for identifying a handover destination base station.

The local route selection function unit 14 uses the topology information database, the call information, and the address for identifying the handover destination base station held by the central control station 2 to obtain the peer group X.3. 2 selects a local route to the ATM switch 4e. This local route selection result is transmitted to the local route selection result message transmission function unit 19.
Output to The local route selection result message transmission function unit 19 performs “local route selection result message” 111.
Is created, and the ATM is transmitted via the ATM cell transmitting / receiving function unit 11.
Transmit to switch 4d. The operation of the ATM switch 4e built in the base station 3B is the same as that of the conventional ATM switch, so that the description is omitted.

As described above, the central control station 1 transmits the peer group X. 1 can be described in detail in the routing list included in the "call setup message" 102, but can be described in other peer groups X.1 and X.2. For the route to the ATM switch in 2, a routing list can be described only globally. Therefore, the routing list included in the “call setup message” 102 includes the other peer group X. Boundary ATM switch 4z at entrance 2
Then, it is necessary to rewrite to a detailed route again. In this embodiment, the central control station 2 supports the operation of rewriting the routing list in the boundary ATM switch 4z, so that the boundary A
The local route selection performed by the TM switch 4z can be omitted, and the call setting can be performed at high speed.

Call setup in the first embodiment described above.
The constant speedup will be described using specific numerical examples. example
If the global route selection time is t₁= 10msec, local route
Selection time t_Two= 10msec, when rewriting routing list
Between t_Three= 1 msec, resource reservation for call and connection confirmation
Time to stand up is t_Four= 10msec, routing list and route selection
T is the transmission time of a message with a fixed result_Five= 1msec
I do. In the prior art, the central control station 1 uses t₁+ T_Two+ T_Three+ T_Five
= 22 msec, ATM switch 4b, t_Three+ T_Four+ T_Five= 12 mse
c, at the boundary ATM switch 4z, t_Two+ T_Three+ T_Four+ T _Five
= 22msec, ATM switch 4d, t_Three+ T_Four+ T_Five= 12mse
c, t with ATM switch 4e built in base station 3B_Three+ T_Four= 1
Since it takes 1msec, it takes 79msec in total for call setup.

According to the first embodiment of the present invention, when the route list rewriting operation is supported, the central control station 1
ATM switch 4b, ATM switch 4d, base station 3B
The processing time does not change with the built-in ATM switch 4e. However, the boundary ATM switch 4z, for topical route selection time t ₂ is not _{necessary, t 3 + t 4 + t} 5 = 12
msec. Therefore, the call setup processing time is 69
msec, so that the speed can be increased by 10 msec as compared with the related art.

Hereinafter, a call setting process of the mobile ATM network system according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a system configuration diagram of a mobile ATM network system according to a second embodiment of the present invention. As before, UNI4.0 is used for the user / network interface protocol and each AT
The M switches 4a to 4e and 4z are connected using the PNNI 1.0 protocol. The same reference numerals are given to the same parts as the arrangement on the network in the case of the conventional system configuration diagram of FIG. FIG. 6 is a call setup sequence diagram of the second embodiment of the present invention.

This embodiment includes the processing operation of the first embodiment as it is. Therefore, the same peer group X.X as the handover destination base station 3B. The centralized control station 2 belonging to the ATM switch 2 supports the rewriting operation of the routing list in the boundary ATM switch 4z, thereby eliminating the local route selection performed by the boundary ATM switch 4z during the call setup and making the call setup faster. Can do it. However, in this second embodiment,
The central control station 2 further obtains a local route selection result,
Based on the information of the call held in the “local routing request message” 110, the peer group X. The "temporary call setting message" 120 having the selected local route information and call information in the base station 2 is built in the base station 3B which is the terminal ATM switch on the new route via the ATM switch 4d. To the ATM switch 4e.

The ATM switch 4e receives the "temporary call setting message" 120, and reserves resources for the call and establishes a connection based on the call information held by the "temporary call setting message" 120. ATM switch 4e
When these are completed, the “tentative call setup message” 12
0 is transmitted in the opposite direction of the new route, that is, to the immediately preceding ATM switch 4d, based on the selected local route information. The ATM switch 4d receives the "temporary call setting message" 120, and performs resource reservation and connection establishment for the call based on the call information held by the "temporary call setting message" 120. AT
Upon completion of these, the M switch 4d transmits a “temporary call setting message” 120 to the immediately preceding boundary ATM switch 4z in the reverse direction of the new route.

On the other hand, in the boundary ATM switch 4z, as described above, the “call setup message” 1
02 is received. The boundary ATM switch 4z
When the resource reservation and connection establishment for the call are completed by the "call setup message" 102, the "call setup message" is sent to the ATM switch 4d in the direction of the new route.
Send 102.

A receiving the “call setup message” 102
The TM switch 4d rewrites the current transit pointer in the routing list of the “call setup message” 102. At this time, in the illustrated ATM switch 4d,
Based on the “temporary call setup message” 120, resource reservation and connection establishment for the call have already been completed. As a result, the “call setup message” 102 is immediately transmitted to the base station 3.
B can be transmitted to the built-in ATM switch 4e.
Since the ATM switch 4e built in the base station 3B has also completed the resource reservation and connection establishment, it immediately sends the "call setup message" 102 to the pseudo terminal built in the base station 3B upon receiving the "call setup message" 102. be able to.

As described above, the ATM located on the new route
Switch 4d and ATM switch 4e with built-in base station B
In this case, resource reservation and connection establishment for a call are performed in advance as a provisional call setting, so that the ATM switch 4d,
Resource reservation and connection establishment relating to the call during the call setting process, which were executed in 4e, can be omitted, and the call setting can be performed at high speed. In addition, the boundary ATM
In the switch 4z, the "call setting message" 102
Thus, resource reservation and connection establishment for a call are performed. Therefore, when the "temporary call setting message" 120 is received thereafter, it is not necessary to newly reserve resources for a call and establish a connection.

The ATM switch 4 in the specific example of FIG.
In d and 4e, when the “temporary call setting message” 120 is received, resource reservation and connection establishment for the call are performed. Therefore, when the “call setup message” 102 is received thereafter, it is not necessary to reserve resources for a call and establish a connection again. That is, the peer group X. In the ATM switches 4z to 4e belonging to the "call setting message" 1
02, the "temporary call setting message" 120, which is received earlier, reserves resources for the call and establishes a connection. Even when the “temporary call setting message” 120 cannot be received due to a network failure, the same call setting processing as before can be performed when the “call setting message” 102 is received.

Here, the functional block configuration of the centralized control stations 1 and 2 and the block configuration of the ATM switches 4a to 4e and 4z of the second embodiment shown in FIG. 5 will be described. FIG. 7 shows the ATM switches 4a to 4e shown in FIG.
It is a functional block diagram of 4z. Parts similar to those of the ATM switches 4a to 4e and 4z of the first embodiment shown in FIG. 3 are denoted by the same reference numerals. FIG. 8 is a functional block diagram of the central control stations 1 and 2 shown in FIG. The illustrated functional block configuration illustrates the functions performed by the central control station when setting up a call. The same parts as those of the centralized control station of the first embodiment shown in FIG. Peer group X. The centralized control station 1, base station 3A, and ATM switches 4a to 4c belonging to 1 are the same as those in the first embodiment, and a description thereof will be omitted.

First, the boundary ATM switch 4z will be described with reference to FIG. In the ATM cell transmission / reception function unit 41, a "local route selection request message" 110 is input from the ATM switch 4b, and the ATM switch 4d
Output to Further, a “local route selection result message” 111 is input from the ATM switch 4 d and received by the local route selection result message reception function unit 49 via the ATM cell transmission / reception function unit 41. The local route selection result message receiving function unit 49 inputs the local route selection result to the local route selection function unit 46, and re-routes from the boundary ATM switch 4z, that is, the peer group X. The local route in 2 is stored in the local route selection function unit 46 in advance.

Thereafter, a "call setting message" 102
Is received by the call setting message receiving function unit 43 via the ATM cell transmitting / receiving function unit 41. Therefore, the call setting message receiving function unit 43 sets the “call setting message” 1
When the routing list of 02 is output to the routing list rewriting operation unit 45, the routing list rewriting operation unit 45 rewrites the routing list based on the route already selected by the central control station 2. As a result, local route selection can be omitted. Further, the call information included in the “call setting message” 102 is input to the call-related resource reservation function unit 47 and the connection establishment control function unit 48 in the same manner as in the first embodiment. Are performed, and when these are completed, a "call setup message" 102 is transmitted to the ATM switch 4d.

In the second embodiment, the ATM
Since the "temporary call setting message" 120 can be received by the temporary call setting message receiving function unit 50 via the cell transmission / reception function unit 41, the call information held by the "temporary call setting message" 120 is transmitted to the call. By inputting the information to the resource reservation function unit 47 and the connection establishment control function unit 48, resource reservation and connection establishment for a call can be performed. However, already a "call setup message"
When 102 has been received, it is not necessary to perform resource reservation and connection establishment for the call again.

Next, the ATM switch 4d will be described with reference to FIG. First, in the ATM cell transmission / reception function unit 41, a “local path selection request message” 110 is input from the boundary ATM switch 4z and output to the central control station 2. Also, the “local route selection result message” 111 is input from the central control station 2 and the boundary AT
Output to the M switch 4z.

Thereafter, a “tentative call setting message” 120
Is received by the provisional call setting message receiving function unit 50 via the ATM cell transmitting / receiving function unit 41. The provisional call setting message receiving function unit 50 includes a “provisional call setting message” 120.
Is output to the resource reservation function unit 47 and the connection establishment control unit 48 for the call, and the resource reservation and connection establishment for the call are performed. When these are completed, the provisional call setting message transmission function unit 51, based on the local path information of the “provisional call setting message” 120, locates the immediately preceding boundary ATM switch 4z located in the opposite direction to the new path. "Temporary call setting message"
Send 120.

Further, the "call setting message" 102 is received by the call setting message receiving function unit 43 from the boundary ATM switch 4z via the ATM cell transmitting / receiving function unit 41. The call setting message receiving function unit 43 inputs the routing list included in the “call setting message” 102 to the routing list rewriting operation function unit 45. The routing list rewriting operation function unit 45 rewrites the current transit pointer of the routing list and outputs it to the call setting message transmission function unit 44. "Temporary call setup message"
Since the call 120 has already completed the resource reservation and connection establishment for the call, the call setting message transmitting function unit 44 immediately transmits the "call setting message" 102 to the ATM switch 4e built in the base station 3B. I do.

Next, the central control station 2 will be described with reference to FIG. As in the first embodiment, when the “local route selection request message” 110 is received by the local route selection request message receiving function unit 18 via the ATM cell transmitting / receiving function unit 11, The local route selection function unit 14 and the local route selection result message transmission function unit 19 operate, and the “local route selection result message”
111 via the ATM cell transmitting / receiving function unit 11
Transmit to switch 4d. At the same time, the local route selection result is input to the provisional call setting message transmission function unit 20, and the call information and the selected local route information, for example, a “provisional call setting message” 120 having a routing list, ATM
Via the cell transmission / reception function unit 11, via the ATM switch 4d, the packet is transmitted to the ATM switch 4e built in the base station 3B located at the terminal on the new route.

Finally, the ATM switch 4e built in the base station 3B will be described with reference to FIG. The ATM switch 4e built in the base station 3B transmits the "temporary call setting message" 120 from the ATM switch 4d via the ATM cell transmitting / receiving function unit 41 to the temporary call setting message receiving function unit 50.
To receive. The provisional call setting message receiving function unit 50 includes:
The information of the call held by the “temporary call setting message” 120 is input to the resource reservation function unit 47 and the connection establishment control function unit 48 relating to the call, and resource reservation and connection establishment are performed. When the provisional call setting message transmission function unit 51 completes these processes, the provisional call setting message transmission function unit 51 sends the provisional call setting message to the immediately preceding ATM switch 4d located in the opposite direction to the new path based on the local path information of the “provisional call setting message” 120. To send a "temporary call setting message" 120.

Further, the "call setting message" 102 is received by the call setting message receiving function unit 43 from the ATM switch 4d via the ATM cell transmitting / receiving function unit 41. The call setting message receiving function unit 43 inputs the routing list included in the “call setting message” 102 to the routing list rewriting operation function unit 45. The routing list rewriting operation function unit 45 rewrites the current transit pointer of the routing list and outputs it to the call setting message transmission function unit 44. Since the resource reservation and the connection establishment for the call have already been completed by the "temporary call setting message" 120, the call setting message transmitting function unit 44
Immediately transmits a “call setting message” 102 to the pseudo terminal built in the base station 3B located in the forward direction of the new route.

As described above, according to the second embodiment, similar to the first embodiment, the local path selection required at the boundary ATM switch is omitted, and the call setting is performed at high speed. be able to. In addition, the ATM switch 4e and the ATM switch 4d built in the base station 3B located on the new route preliminarily reserve resources for the call and establish the connection, so that the respective ATM switches 4d and 4e on the new route. This eliminates resource reservation and connection establishment related to the call performed in step (1), and enables high-speed call setting for a new route at the time of handover.

Call setup in the second embodiment described above.
The speeding up of the constant processing will be described using specific numerical examples.
A description will be given by using the numerical examples used in the first embodiment again.
You. The global routing time is t₁= 10msec, local route
Selection time t_Two= 10msec, when rewriting routing list
Between t_Three= 1 msec, resource reservation for call and connection confirmation
Time to stand up is t _Four= 10msec, routing list and route selection
T is the transmission time of a message with a fixed result_Five= 1msec
I do. In the conventional method, in the central control station 1, t₁+ T_Two+ T_Three+
t_Five= 22 msec, ATM switch 4b, t_Three+ T_Four+ T_Five= 12 m
sec, at the boundary ATM switch 4z, t_Two+ T_Three+ T_Four+ T
_Five= 22msec, ATM switch 4d, t_Three+ T_Four+ T_Five= 12m
sec, ATM switch 4e built in base station 3B, t_Three+ T_Four
= 11 msec, so a total of 79 msec for call setup.

In the second embodiment of the present invention, the centralized control station 1
The processing time does not change in the ATM switch 4z. However, the boundary ATM switch 4z, for topical route selection time t ₂ is not _{necessary, t 3 + t 4 + t} 5 = 12msec, A
Since the TM switch resource reservation for a call in the 4d and connection establishment time required t ₄ becomes unnecessary, t ₃ + t ₅ = 2mse
c. The time t ₄ required for resource reservation and connection establishment for the call is not required even in the ATM switch 4 e built in the base station 3 B, so that t ₃ = 1 msec. Therefore, the call setup processing time is 49 msec in total, which is 30 times longer than that of the prior art.
msec can be speeded up.

In the description of the second embodiment, the route list rewriting operation support and the A on the new route are described.
Both the provisional call setting and the TM switch were executed. However, be performed only temporary call setup, may be ATM switches 4d, the time t ₄ when required resource reservation and connection establishment for a call in 4e unnecessary. Further, both the resource reservation and the connection establishment for the call are performed by the provisional call setting, but either one may be performed in the provisional call setting. That is, as described in the description of the prior art, resource reservation and connection establishment for a call are performed until the port number, VPI, VCI, and the like are determined.
A processing common to both, the time t ₄ when required resource reservation and connection establishment for a call described above, the port number, VPI, includes the processing time for determining the like VCI. Therefore, if either the resource reservation for the call or the connection establishment is performed at the time of provisional call setup, when the “call setup message” 102 is received,
There is no need to perform processing for determining the port number, VPI, VCI, and the like. As a result, the other process can be performed in a short time.

In the above description, the "temporary call setting message" 120 is transmitted from the ATM switch 4e built in the base station 3B in the opposite direction to the boundary ATM switch 4z. By doing so, the AT on the new route
Arrival times of the “call setup message” 102 and the “temporary call setup message” 120 in the M switch can be shifted as much as possible to avoid concentration of processing. But,
The central control station 2 transmits a “temporary call setting message” 120 to the boundary ATM switch 4z, and from this, can transmit the “temporary call setting message” 120 in the forward direction of the new route. The “temporary call setting message” 120 does not necessarily need to be transmitted on the new path, and can be individually distributed to ATM switches on the new path by another path. In this case, since the distributed “temporary call setting message” 120 is no longer transmitted to another ATM switch, the distributed “temporary call setting message” 120 includes:
It is not necessary to have the selected route selection result.

In the above description, the “call setup message” 102 has been transmitted between the two peer groups. But,
"Call setup message" serially between three or more peer groups
In the case where 102 is transmitted, call setting can be performed in a similar manner. That is, the central control station in each peer group receives the global route selection result, selects a local route in each peer group, and reports the local route selection result to the boundary of the entrance of each peer group. Send to ATM switch. Further, the centralized control station in each peer group described above may transmit the temporary call setup message to the ATM switch built in the handover destination base station or the ATM switch serving as an exit to the next peer group.

In the above description, global route information and call information are transmitted as one “local route selection request message”. However, global route information and call information may be transmitted in individual messages. If another message having the third information is to be sent, the message may be sent together with global route information or call information. Similarly, in the above description, the information of the selected local route and the information of the call are transmitted as one “temporary call setting message”. However, the information of the selected local route and the information of the call may be transmitted in individual messages. Also, the third
If there is a case where another message having the above-mentioned information is sent, the message may be sent together with information on the selected local route or call information. In the above description, the AT
Mobile ATM based on M private network
A description has been given of the call setup for a new route after a handover in a network. However, the present invention is not limited to the above-described mobile ATM network, and can be applied to call setting over groups in a hierarchically structured ATM network.

[0083]

According to the present invention, the central control station of the handover destination group can select a local route in the second group, thereby setting up a call at high speed. is there. More specifically, the centralized control stations belonging to the second group are configured so that when the boundary ATM switch receives the "call setup message", the local routing operation within the second group can be omitted. By supporting boundary ATM switches,
There is an effect that call setting can be performed at high speed.
At least a second one of the ATM switches on the local path in the selected second group is configured to perform the second switch before receiving the “call setup message”.
Using a provisional call setting message transmitted from the central control station belonging to the group, resource reservation and connection establishment for a call can be performed in advance, and there is an effect that call setting can be performed at high speed.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a mobile ATM network system according to a first embodiment of the present invention.

FIG. 2 is a call setup sequence diagram for a new route according to the first embodiment of this invention.

FIG. 3 is a functional block diagram of the ATM switch shown in FIG. 1;

FIG. 4 is a functional block diagram of the central control station shown in FIG.

FIG. 5 is a system configuration diagram of a mobile ATM network system according to a second embodiment of the present invention.

FIG. 6 is a call setup sequence diagram according to the second embodiment of this invention.

FIG. 7 is a functional block diagram of the ATM switch shown in FIG.

8 is a functional block diagram of the central control station shown in FIG.

FIG. 9 is a system configuration diagram of a conventional mobile ATM network system.

FIG. 10 is a call setting sequence diagram for a conventional new route.

FIG. 11 is a functional block diagram of the conventional ATM switch shown in FIG.

FIG. 12 is a functional block diagram of the conventional centralized control station shown in FIG.

[Explanation of symbols]

1, 2, central control station, 3A, 3B base station, 4a, 4
b, 4c, 4d, 4e: ATM switch, 5: mobile terminal, 6: communication partner terminal, X. 1, X. 2. Peer group

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 GA01 HA10 HB00 HC09 JT09 LB01 5K067 AA15 BB02 CC08 DD23 DD34 DD36 EE02 EE10 EE16 EE23 JJ39 9A001 BB04 CC05 CC07 JJ12 KK56

Claims (11)

[Claims] 1. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively. A centralized control station belonging to a first group is connected to a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to the second group, information on a global route and information on a call from the first group to the second group is previously stored. To the central control station belonging to the second group, wherein the central control station belonging to the second group receives the global route information and the call information, Selecting a local route in the second group, wherein each ATM switch along the selected local route in the second group includes Setting the configuration message along a local path in the selected second group,
The ATM network system transmits data to the second ATM switch. 2. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to a second group, information on a global route and information on a call from the first group to the second group is previously stored. A central control station of an ATM network system for transmitting the information to the central control station belonging to the second group, and receiving means for receiving the global route information and the call information; Means for selecting a local path of the call request message to each ATM switch along the local path in the selected second group. Along the local paths in the selected the second group,
A centralized control station for an ATM network system, comprising control means for transmitting data to the second ATM switch, and functioning as at least a centralized control station belonging to the second group. 3. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to a second group, information on a global route and information on a call from the first group to the second group is previously stored. Of the ATM network system for transmitting to the central control station belonging to the second group
A switch for transmitting the call setup message to the second ATM switch along a local path in a second group selected by a central control station belonging to the second group. An ATM switch in an ATM network system, wherein the ATM switch functions as an ATM switch along at least a local route in the selected second group. 4. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group, When transmitting a call setup message to the second ATM switch belonging to a second group, information on a global route and information on a call from the first group to the second group is previously stored. To the central control station belonging to the second group, wherein the central control station belonging to the second group receives the global route information and the call information, Selecting a local route within the second group and selecting the selected second
Transmitting the information of the local route in the group to the boundary ATM switch belonging to the second group, wherein the boundary ATM switch comprises:
Receiving the information of the local route in the group and the call setup message, and when receiving the call setup message, the local route in the second group selected in the call setup message. Transmitting the call setup message with information to an ATM switch along a local route in the selected second group. 5. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to the second group, information on a global route and information on a call from the first group to the second group is previously stored. A central control station of an ATM network system that transmits the global route information and the call information to the central control station belonging to the second group. A selecting unit for selecting a local route of the second group; and information of the selected local route in the second group. Has a transmission unit that transmits to the switch, the centralized control station of the ATM network system, characterized in that the functions as a centralized control station belonging to at least the second group. 6. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is connected to a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to a second group, information on a global route and information on a call from the first group to the second group is previously stored. Of the ATM network system for transmitting to the central control station belonging to the second group
A switch for receiving information on a local route in the selected second group selected and transmitted by the central control station belonging to the second group; and Receiving the call setup message and providing information on a local route in the selected second group, and transmitting the call setup message to a local route in the selected second group. An ATM switch for transmitting data to an ATM switch along the ATM line, wherein the AT functions as at least the boundary ATM switch.
M switch. 7. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to the second group, information on a global route and information on a call from the first group to the second group is previously stored. To the central control station belonging to the second group, wherein the central control station belonging to the second group receives the global route information and the call information, Selecting a local route within the second group and selecting the selected second
Transmitting the information of the local route and the information of the call in the group of the second ATM switch to the second ATM switch, wherein the second ATM switch transmits the information of the local in the selected second group. Receiving the route information and the call information, making a resource reservation for the call, and transmitting the local route information and the call information in the selected second group to the selected second group. The ATM network system transmits to the ATM switch in the reverse direction along the local path in the group of the ATM network. 8. A plurality of groups each include a central control station and a plurality of ATM switches, wherein the central control station belonging to the first group is configured by a first ATM switch belonging to the first group, When transmitting a call setup message to the second ATM switch belonging to the second group, information on a global route and information on a call from the first group to the second group is previously stored. A central control station of an ATM network system that transmits the global route information and the call information to the central control station belonging to the second group. A selecting unit that selects a local route of the second ATM switch; and information of the selected local route in the second group and the information of the call to the second ATM switch. Has a transmission unit for signal for centralized control station of the ATM network system, characterized in that the functions as a centralized control station belonging to the second group. 9. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to a second group, information on a global route and information on a call from the first group to the second group is previously stored. Of the ATM network system for transmitting to the central control station belonging to the second group
A switch for receiving local call information and call information in the selected second group selected and transmitted by the central control station belonging to the second group; and A resource reservation unit for performing resource reservation for a call; and information on the local route in the selected second group and information on the call in the local route in the selected second group. An ATM switch for transmitting data to an ATM switch in a reverse direction along the ATM switch, wherein the ATM switch functions as at least the second ATM switch. 10. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to a second group, information on a global route and information on a call from the first group to the second group is previously stored. To the central control station belonging to the second group, wherein the central control station belonging to the second group receives the global route information and the call information, Selecting a local route within the second group and selecting the selected second
Transmitting the information of the local route in the group of the second group and the information of the call to the second ATM switch, wherein the second ATM switch transmits the information of the local group in the selected second group. Receiving the route information and the call information, establishing a connection, and transmitting the local route information and the call information in the selected second group to the selected second group. Transmitting to an ATM switch in a reverse direction along a local path in the ATM network. 11. A centralized control station and a plurality of ATM switches belong to a plurality of groups, respectively, and a centralized control station belonging to a first group is provided from a first ATM switch belonging to the first group by: When transmitting a call setup message to the second ATM switch belonging to the second group, information on a global route and information on a call from the first group to the second group is previously stored. Of the ATM network system for transmitting to the central control station belonging to the second group
A switch, which is selected and transmitted by a central control station belonging to the second group, and receives a local route information and the call information in the selected second group; A connection establishing unit that establishes a connection, and reverses information on the local route in the selected second group and information on the call along the local route in the selected second group. An ATM switch for an ATM network system, comprising: a transmitting unit for transmitting to an ATM switch in a direction, and functioning at least as the second ATM switch.