JP2542475B2 - Line / packet integrated switching system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line / packet integrated switching system, and more particularly to a line / packet integrated switching system in an integrated switching system for providing a circuit switching service and a packet switching service to the same subscriber line.

[0002]

2. Description of the Related Art FIG. 2 shows a relay system diagram of a line / packet integrated switching system in the prior art. As shown in the figure, conventionally, in such an integrated switching system, a subscriber line (SUBLINE) is accommodated and a telephone network (C
Circuit switching module (CSWM) connected to STN)
And a packet switching module (PHM) connected to the packet network (PSDN).

In such a switching system, a circuit (TR) for transferring packet information between a circuit switching module for providing a circuit switching service and a packet switching module for providing a packet switching service.
K) a signaling link (PSIG) for exchanging control signals with
L) provides the circuit-switched service or the packet service to the subscriber terminal.

[0004]

However, in such a conventional technique, a circuit switching module for exclusively providing a circuit switching service and a packet switching module for exclusively providing a packet switching service are configured separately. The system configuration had the following problems.

(1) Even in a small office, two types of modules, a circuit switching module and a packet switching module, are required, so that cost efficiency is low.

(2) Subscriber management, service management / control,
Since such functions are separated by line / packet, it is difficult to realize a service that links the circuit switching service and the packet switching service, and the operation of the system becomes complicated.

The present invention solves the above-mentioned drawbacks of the prior art by linking the circuit switching service and the packet switching service without separating the functions of subscriber management, service management / control, etc. by line / packet. Line with high serviceability
It is intended to provide a packet integrated switching system.

[0008]

In order to solve the above problems, the present invention provides an integrated switching system for providing a circuit switching service and a packet switching service to a subscriber terminal. A device, a packet interface terminating device that terminates a user packet link, and a packet trunk device that terminates a packet relay line,
Subscriber line terminator, packet interface terminator,
A control program for controlling the packet trunk device is provided in the switching resource layer, a call control program for performing call control is provided in the call control layer above the switching resource layer, and the interface between the switching resource layer and the call control layer is the line interface. An interface that does not depend on the connection method is adopted, and the call control program manages and controls the switching service in circuit switching / packet switching by this interface.

[0009]

According to the present invention, the call control program provided in the call control layer receives information associated with call processing from the control program for controlling the subscriber line terminating device, the packet interface terminating device and the packet trunk device. A predetermined control program is activated in accordance with the contents, and management and control of switching services in circuit switching / packet switching are performed by an interface that does not depend on the connection method.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, referring to the attached drawings,
An embodiment of the packet integrated switching system will be described in detail.

Referring to FIG. 1, there is shown a system configuration diagram of a line / packet integrated switching system to which an embodiment of a line / packet integrated switching system according to the present invention is applied. As shown in the figure, the line / packet integrated switching system in this embodiment is composed of various switching devices, a switching resource layer and a call control layer.

The various switching devices are subscriber line termination devices 10,
Line switch 12, packet interface termination device 1
4, a packet switch 16 and a packet trunk device 18, which are housed in the same control module.

The subscriber line terminating device 10 is a device for terminating a subscriber line, and is a terminating device connected to a subscriber terminal (not shown) such as a data terminal via the subscriber line. The subscriber terminal device 10 is connected to the line switch 12.

The line switch 12 is a switch that accommodates a plurality of subscriber line termination devices 10 and controls switching of signals exchanged between terminals connected to these subscriber line termination devices 10. The line switch 12 is also connected to the packet interface termination device 14.

The packet interface terminating device 14 is a device for terminating a user packet link. The packet interface terminating device 14 is arranged between the line switch 12 and the packet switch 16 and serves as an interface for signals passing between the line switch 12 and the packet switch 16.

The packet switch 16 is a switch that accommodates a plurality of packet trunk devices 18 and controls switching of packets transmitted and received through the devices 18. The packet trunk device 18 is a trunk that terminates a packet relay line.

The switching resource layer is a subscriber line termination device 10.
Line interface control program 20 for controlling
It comprises a packet interface control program 22 for controlling the packet interface terminating device 14 and a packet relay control program 24 for controlling the packet trunk device 18.

Further, the call control program 30 of the call control layer
Is a program for managing and controlling subscriber terminals and services. The call control program 30 also includes a line interface control program 20, a packet interface control program 22, and a packet relay control program 24.
By receiving the information from, the line / packet integrated switching is performed by starting these programs from time to time.

In such a software structure, an interface common to circuit switching / packet switching is defined between the program of the switching resource layer and the program of the call control layer. That is, in this embodiment, SetupInd (S1, S
5) is an interface for notifying the call control layer program 30 of the call setup request from the switching resource layer program, and SetupRq (S2, S6) is the call control layer program 30 of the switching resource layer program. Represents an interface for requesting call setup.

ConInd (S3, S7) is an interface for notifying the call control layer program 30 that the exchange resource layer program has connected the channel, and ConRq (S4, S8) is the call control layer. Represents the interface for requesting a channel connection to the exchange resource layer program. Next, the flow of control in this embodiment will be described by taking as an example the case where the data terminal connected to the subscriber line terminating device 10 requests packet communication.

Upon receiving the calling signal from the subscriber terminal, the subscriber line terminating device 10 notifies the line interface control program 20 of this. Upon receiving this notification, the control program 20 activates the SetupInd interface (S1).

When the SetupInd interface is activated, the call control program 30 selects an appropriate packet interface terminating device 14 from the subscription information and interface information of the subscriber and activates the SetupRq interface (S2).

When the SetupRq interface is activated, the packet interface control program 22 corresponding to the packet interface terminating device 14 connects the subscriber line terminating device 10 and the packet interface terminating device 14 using the line switch 12, and terminates this termination. Device 14
After activating, the ConInd interface is activated. (S3) When the ConInd interface is activated, the call control program 30 activates the ConRq interface (S4). The line interface control program 20 is C
Upon receiving onRq, the subscriber terminal is notified via the subscriber line terminating device 10 that the line has been connected. Upon receiving this notification, the subscriber terminal requests the connection (C
R) Send out the packet.

The packet interface terminator 14 is C
When the R packet is received, the packet interface control program 22 is notified. Upon receiving this notification, the control program 22 activates the SetupInd interface (S5).

When the SetupInd interface is activated, the call control program 30 selects the appropriate packet trunk device 1 from the subscriber's subscription information and interface information.
8 is selected, and the SetupRq interface is activated (S6).

When the SetupRq interface is activated, the packet relay control program 24 corresponding to the packet trunk device 18 sets a packet relay channel with the destination subscriber accommodation station. Then, using the packet switch 16, the packet interface termination device 14
After connecting the logical channel of 1 to the relay channel of the packet trunk device 18, the ConInd interface is activated (S7).

When the ConInd interface is activated, the call control program 30 activates the ConRq interface (S8). Upon receiving ConRq, the packet interface control program 22 completes connection to the subscriber terminal via the packet interface terminating device 14 (C
C) Send the packet. This allows the subscriber terminal to send and receive data packets using the connected logical channel.

As described above, according to this embodiment, various devices for circuit switching and various devices for packet switching are accommodated in the same control module, and a program for controlling these devices and a subscriber / service are managed / managed. The interface between the controlling programs does not depend on the line connection method. Therefore, it is possible to easily provide a service in which the circuit switching service and the packet switching service are linked.

In this embodiment, the subscriber line terminating device 10 is used.
The control operation has been described by taking as an example the case where the data terminal connected to the node requests the packet communication. However, it goes without saying that the communication request from another station sent via the trunk line is connected to the subscriber terminating device 10. It is also possible to send it to a subscriber terminal that has been set up.

[0030]

As described above, according to the line / packet integrated switching system of the present invention, the packet interface terminating device is provided between the line switch and the packet switch, and the subscriber line terminating device, the packet interface terminating device and the packet trunk device are provided. The system configuration is such that each control program manages / controls, and these call control programs are collectively managed / controlled by the call control program. As a result, the call control program in the call control layer can be a subscriber / switching service management / control program that does not depend on the circuit switching / packet switching implementation method.

Therefore, subscriber management, service management,
Functions such as control are not separated by line / packet, and it is possible to easily provide a service that links the circuit switching service and the packet switching service.

Further, according to the present invention, since functions such as subscriber management, service management / control, etc. are not separated by line / packet, the operation of the system becomes easier as compared with the case where they are separated.

According to the present invention, a subscriber line terminating device, a line switch, a packet interface terminating device,
Since the packet switch and the packet trunk device can be accommodated in the same control module, cost efficiency is high even in a small station.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a line / packet integrated switching system according to the present invention;

FIG. 2 is a relay system diagram showing a conventional line / packet integrated switching system.

[Explanation of symbols]

 10 subscriber line terminator 12 line switch 14 packet interface terminator 16 packet switch 18 packet trunk device 20 line interface control program 22 packet interface control program 24 packet relay control program 30 call control program

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaharu Inafune 1-12 Toranomon, Minato-ku, Tokyo Oki Denki Kogyo Co., Ltd. No. Nippon Telegraph and Telephone Corporation (72) Inventor Shigehiko Suzuki 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Eiichi Murayama 5-7-1, Shiba, Minato-ku, Tokyo Japan Electric Co., Ltd. (72) Inventor Manabu Matsui 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (56) Reference JP-A-2-283148 (JP, A) JP-A-2-260737 (JP, A) Proceedings of the Autumn Meeting of the Institute of Electronics, Information and Communication Engineers, 1990, B-365 (October 1990) Kishida, Kai, Nakamura “Layering and Interface of Switch Control” (Separate volume 3, P.27)

Claims (2)

(57) [Claims] 1. A line / packet integrated switching method in an integrated switching system for providing a circuit switching service and a packet switching service to a subscriber terminal, wherein the integrated switching system comprises a subscriber line terminating device for terminating a subscriber line, A control program having a packet interface terminating device terminating a user packet link and a packet trunk device terminating a packet relay line, and performing program control of each of the subscriber line terminating device, the packet interface terminating device, and the packet trunk device. Is provided in the switching resource layer, a call control program for performing program control for call control is provided in the call control layer above the switching resource layer, and the interface between the switching resource layer and the call control layer is a line connection. Common to circuit switching / packet switching that does not depend on the method Taking an interface that can use the line-Packet Consolidation switching system said call control program by the interface and performing management and control of the exchange services in the circuit-switched / packet-switched. 2. The line / packet integrated switching system according to claim 1, wherein the subscriber line terminating device, the packet interface terminating device and the packet trunk device are accommodated in series in the same control module. Line / packet integrated switching system.