JPH1098470A - Incoming call transfer method for atm network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer data to an ATM terminal equipment after transfer without aborting the data reached to an ATM switch before transfer in the case that a PVC connection ATM terminal equipment is transferred in an ATM network. SOLUTION: In the case of transferring an ATM terminal equipment 121 in the ATM network system, the ATM terminal equipment 121 acquires an ATM address of the ATM terminal equipment 121 itself from an ATM switch 120 connected before the transfer and stores an ATM address before the transfer in the ATM terminal equipment 121. Then after the transfer, in the case of receiving data of the ATM address before transfer to itself by the ATM switch 120 before the transfer through an ATM switch, 130 after the transfer connected to the ATM terminal equipment 121, the data are not aborted and a transfer request is made to the ATM address after the transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asyn)
The present invention relates to an ATM network that performs communication using a "chronous transfer mode" (asynchronous transfer mode) method, and particularly to an incoming call transfer method when an ATM terminal connected to a PVC (fixed connection) is relocated.

[0002]

2. Description of the Related Art In an ATM network, information on ATM terminals connected by PVC is held as PVC connection information in a table in an ATM switch. Therefore, when the ATM terminal is relocated, it is necessary to reset the PVC connection information in the ATM switch. Also, depending on the ATM switch, the AT may be used to make the reset information valid.
If it is necessary to restart the M switch and the network system cannot be stopped in operation, the data for the relocated ATM terminal that has reached the ATM switch before relocation has been discarded.

[0003]

In the conventional system,
When relocating ATM terminals connected by PVC, P
It was necessary to change the VC information and restart the ATM switch. Therefore, in a system where the network cannot be stopped for operation, data to the relocated ATM terminal
It was discarded until the M switch was restarted.

[0004] An object of the present invention is to provide a method for relocating an ATM terminal connected by PVC in an ATM network.
It is an object of the present invention to provide an incoming call transfer method in which data arrived at an ATM switch before relocation is transferred to an ATM terminal after relocation without being discarded.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided an ATM network system comprising:
When relocating an ATM terminal, the ATM terminal obtains the ATM address of the ATM terminal itself from the connected ATM switch before the relocation, and stores the ATM address before the relocation in the ATM terminal.
After the transfer, the ATM address is held and the ATM terminal is connected to the ATM terminal.
When the TM switch receives data addressed to itself before the transfer, the ATM switch issues a transfer request to the ATM address after transfer without discarding the data.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, a first embodiment will be described. FIG. 1 is a basic configuration diagram of an ATM network according to the present invention. In the case of the first embodiment, in FIG.
Is an application server and the ATM terminal 121
Is an ATM end device having an application client function. A table 201 in the ATM terminal 121 is a table for holding an ATM address before relocation.

The communication protocol 501 is composed of an ATM terminal and an A
A communication protocol of the TM switch, and a communication protocol 502 is a communication protocol between the ATM switches.

FIG. 2 is a basic configuration diagram showing an ATM cell switching table in the ATM switch shown in FIG. 1, and is composed of an ATM terminal, a port number, an ATM address, a transfer request flag and the like.

FIG. 3 shows the basic structure of the transfer destination correspondence table of the ATM switch shown in FIG. 1, which comprises a transfer source ATM address, a transfer destination ATM address, a transfer time limit, and the like.

FIG. 4 is a schematic diagram of a communication protocol between the ATM terminal and the ATM switch in FIG. 1, and FIG. 5 is a schematic diagram of a communication protocol between the ATM switches in FIG.

The present invention having the above components will be described.

In FIG. 1, an ATM terminal 111 sends an AT
When the ATM terminal 121 is relocated to 131 under the ATM switch 130 while data is being transmitted to the ATM terminal 121 via the M switches 110 and 120 via a PVC (fixed destination connection) connection, the ATM terminal 121 is not relocated. AT
A transfer request is issued to the M switch 120 using the data communication protocol 501 between the ATM terminal and the ATM switch. The ATM terminal transmits the A before the transfer from the ATM switch 120.
The TM address and the band are received and held in the pre-migration ATM address storage table 201. ATM terminal 121 is AT
When transferred to the M terminal 131, the data communication protocol 50
1 and sends a data transfer request to the ATM switch 130 with the ATM address before transfer, the band, and the transfer time limit. Upon receiving the transfer request, the ATM switch 130 receives the pr of the ATM address that has received the ATM switch 120 before the transfer.
The connection request with the relocated ATM terminal 131 is issued to the pre-relocation ATM switch 120 using the ATM data communication protocol 502. ATM
When the switch extends the connection between the ATM terminal 131 after the transfer and the ATM switch 120 before the transfer, if the same bandwidth as before the transfer can be secured, the same service category as before the transfer is set, and the bandwidth below the band before the transfer is set. If only the band can be secured, the service category is set to UBR. When the connection setting is completed, the ATM switch 120
Sets the transfer request flag in the cell switching table 202 and sets the transfer destination ATM address in the transfer destination correspondence table 203 (which may be in the cell switching table). Thereafter, the ATM switch 120 uses A
For the data addressed to the TM terminal 121, the data is transferred to the ATM terminal 1 until the transfer time limit comes based on the transfer destination correspondence table.
Transfer to 31.

In consideration of security, ATM
The switch 120 holds the data of the ATM terminal 121 in the cell switching table when a transfer request comes from the ATM terminal, and when the data transfer request to the ATM terminal 121 comes, the switch 120 is previously connected by the MAC address part of the ATM address. ATM terminal 121
Is confirmed, and the data transfer request is accepted only when it is the ATM terminal 121. That is, AT before relocation
When the M switch receives a data transfer request addressed to the ATM terminal after the transfer, the M switch determines whether the requested ATM terminal is the same ATM terminal as the connected ATM terminal. (End Sys
A MAC address used in a LAN network is used as a “item identifier” section.

Next, a second embodiment will be described with reference to FIG. The transfer request is issued from the ATM terminal 121 before transfer by using the protocol 501. ATM switch 1
20 receives a transfer request, sets a transfer request flag in the cell switching table 202, and replaces the ATM address with the address of the ATM terminal 122. The transfer-destination ATM terminal 203 (A)
The address of the ATM terminal 122 may be set to the ATM terminal 122 by the protocol 501.
Then, a request for data interception is issued.

When the ATM terminal 121 is relocated to the ATM terminal 131, the ATM terminal 131 issues a data transfer request to the ATM switch 130 by the protocol 501 after the relocation. When the ATM switch 130 receives the data transfer request after the transfer, the ATM switch 130 uses the protocol 502 to issue a connection request between the call receiving device ATM terminal 122 and the ATM terminal 131 after the transfer. Then, a transfer request is sent to the call receiving device ATM terminal 122. The ATM terminal 122 that has received the transfer request stores the transfer source ATM address and the transfer destination ATM address in the transfer destination correspondence table 203 held in the ATM terminal 122.
When an address and a transfer deadline are set and data addressed to the ATM terminal 121 is received, the data is transferred to the ATM terminal 131 until the deadline comes based on the transfer destination correspondence table.

[0017]

As described above, according to the present invention,
In an ATM network, even when an ATM terminal is relocated and the ATM switch cannot be stopped in operation and the configuration definition information cannot be changed, the operation can be performed without discarding the data addressed to the relocated ATM terminal.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a cell switching table in an ATM switching node.

FIG. 3 is an explanatory diagram of a transfer destination correspondence table in an ATM switching node.

FIG. 4 is a schematic diagram of a communication protocol between an ATM terminal and an ATM switch.

FIG. 5 is a schematic diagram of a communication protocol between ATM switches.

FIG. 6 is a configuration diagram of an ATM network according to a second embodiment of the present invention.

[Explanation of symbols]

110, 120, 130... ATM switching nodes,
111, 121, 122, 131 ... ATM terminal, 201
... ATM address holding table before relocation, 202 ... Cell switching table, 203 ... Transfer destination correspondence table,
501: Protocol for communication between ATM terminal and ATM switch, 502: Protocol for communication between ATM switches.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tomohisa Nishijima 810 Shimoimaizumi, Ebina-shi, Kanagawa Prefecture Hitachi Systems Ltd. Office Systems Division

Claims (1)

[Claims] 1. An ATM network system, comprising:
When the ATM terminal is relocated, the ATM terminal transmits the ATM terminal's own ATM switch from the ATM switch connected before the relocation.
Obtain the TM address and transfer it to the ATM terminal.
After the transfer, the ATM terminal connected to the ATM terminal is connected to the ATM switch before the transfer through the ATM switch.
An incoming call transfer method for an ATM network, characterized in that when an M switch receives data addressed to itself before the transfer, the ATM switch issues a transfer request to the ATM address after transfer without discarding the data.