KR100307927B1 - Method for Providing Tone from Line Switching System to ATM Switching System - Google Patents

Abstract

The present invention relates to a method for providing a tone for an Asynchronous Tranefer (ATM) switching system.

In the conventional ATM switching system, there was a limitation of providing a tone by setting up a call with VMS or IP or providing a tone at a terminal. When a call is set up in a VMS and providing a tone, a call is simply set to another device for the tone. Therefore, there is a problem that communication cost is too high, and in case of providing a tone by connecting to IP, there is a limitation that the intelligent network interworking must be supported in the system, and a tone can be provided if the terminal does not provide the tone function. There was no way.

In the present invention, since the tone is provided through the semi-permanent fixed path from the synchronous circuit switching system interworking with the ATM switching system to the ATM switching system, the tone switching system can provide the tone economically and efficiently.

Description

Method for Providing Tone from Line Switching System to ATM Switching System {Method for Providing Tone from Line Switching System to ATM Switching System}

The present invention relates to a method for providing a tone for an ATM (Asynchronous Tranefer) switching system. In particular, the present invention relates to a semi-permanent fixed path from an synchronous circuit switching system interworking with an ATM switching system to an ATM switching system. The present invention relates to a tone providing method from a circuit switching system to an ATM switching system for providing a tone.

In general, the ATM switching system is used as a major exchange means in the Broadband-Integrated Service Digital Network (B-ISDN), which transmits and receives a variety of information at high speed since it provides a function of delivering information asynchronously and at high speed.

In the case of providing a communication service to a subscriber using such an ATM switching system, various tones are used in the communication process.

The conventional ATM switching system supports ITU-T Recommendation Q.2931 signaling (DSS2; Digital Subscriber Signaling 2), a B-ISDN subscriber call matching protocol. Such ATM switching systems do not provide tones within the system.

Since the conventional ATM switching system does not provide a tone, for example, when a B-ISDN subscriber or an IMT-2000 subscriber attempts to make a voice call, or when a voice call is received through an incoming call, the subscriber must provide a tone. In this case, the call is set to VMS (Voice Mailing System) or IP (Intelligent Peripheral) to provide a tone or a tone is provided by the terminal.

That is, in the conventional ATM switching system, there was a restriction to provide a tone by setting a call with VMS or IP or to provide a tone at a terminal. When providing a tone by setting a call to a VMS, a call is simply made to other equipment for a tone. There is a problem in that communication cost is too high, and when providing a tone by accessing IP, there is a limitation that the intelligent network interworking should be supported in the system, and a tone is provided if the terminal does not provide the tone function. There was no way to do it.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a tone through a semi-permanent fixed path from a synchronous circuit switching system interworking with an ATM switching system to an ATM switching system. It is to provide tones economically and efficiently.

1 is a block diagram of a circuit switching system interworking with an ATM switching system according to the present invention.

2 is a flowchart illustrating a tone routing process from a circuit switching system to an ATM switching system according to the present invention.

Explanation of symbols on the main parts of the drawings

10 circuit switching system 11 subscriber call processing unit

12: general device control unit 13: tone device

14: time switch connection processing device 15: AAL1 / PCM matching device

16: 155Mbps interface 17: AAL5 matching unit

20: ATM switching system 21: 155Mbps class access processing device

In order to achieve the above object, a feature of the present invention includes: retrieving tone path information of a tone source by searching for a virtual path identifier and a virtual channel identifier allocated one-to-one with a tone source when the system is started; Connecting the tone device and the time switch; Retrieving a channel resource table for the AAL1 / PCM matching device; Connecting a channel of the time switch and an AAL1 / PCM matching device; And connecting the AAL1 / PCM matching device with an ATM switch via a 155Mbps access device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The circuit switching system interworking with the ATM switching system according to the present invention is configured as shown in FIG. That is, the circuit switching system 10 includes a subscriber call processing unit 11, a general device control unit 12, a tone device 13, a time switch connection processing unit 14, and AAL1 / PCM (ATM Adaptation Layer 1 / Pulse Code Modulation). ) A matching device 15, a 155 Mbps class access device 16, and an AAL5 (ATM Adaptation Layer 5) matching unit 17, and the ATM switching system 20 exchanges circuits through the 155 Mbps class access processing unit 21. Is connected to the system 10. The subscriber call processing unit 11 performs a call processing operation, but controls the operations of the tone device 13, the time switch connection processing device 14, the AAL1 / PCM matching device 15, and the 155 Mbps access device 16. The AAL5 matching unit 17 sends and receives signaling messages of the ITU-T Recommendation Q.2931 to the ATM switching system 20 side. The general device controller 12 collects information necessary for maintenance and provides the operator and the subscriber call processor 11. The tone device 13 generates a tone for each tone source, and the time switch connection processing device 14 is responsible for connecting the tone device 13 and the AAL1 / PCM matching device 15. In addition, the AAL1 / PCM matching device 15 receives PCM data including voice / non-voice for transmitting information through a time switch, converts it into an ATM layer AAL1 cell type, and passes the ATM through the 155Mbps access device 16. It outputs to the switching system 20 side, and converts ATM layer AAL1 cell applied from the ATM switching system 20 through the 155Mbps class connection device 16 into PCM data, and outputs it to the time switch side. The 155 Mbps class access device 16 physically connects the circuit switching system 10 to the ATM switching system 20. The AAL5 matching unit 17 and AAL1 are analyzed by analyzing a cell applied from the ATM switching system 20. It serves to separate the cell to / PCM matching device (15).

In the system configured as described above, the circuit switching system 10 sets the tone path while the subscriber call processing unit 11 sends and receives an ITU-T Q.2931 signaling message to the ATM switching system 20 through the AAL5 matching unit 17. In the process of assigning a virtual channel identifier (VCI) and a virtual path identifier (VPI) to a corresponding tone, the tone is converted into an ATM layer AAL1 cell and transmitted to the ATM switching system 20 when the tone is transmitted. The channel identifier (VCI) and the virtual path identifier (VPI) are added to the header of the transmitting cell and transmitted over a fixed path, thereby providing a virtual channel identifier (VCI) and a virtual path identifier (VCI) when a tone is needed in the ATM switching system 20. VPI) allows you to connect and use the desired tone.

The tone path setting process from the circuit switching system to the ATM switching system according to the present invention will be described in detail with reference to the flowchart of FIG.

First, when the system is started up (step S1), the subscriber call processor 11 searches the tone path table provided therein (step S2) to check whether there is a tone path for the tone source that can be provided by the system. (Step S3), if it is confirmed that the tone path exists, the virtual path identifier (VPI) and the virtual channel corresponding to the tone source number assigned to the tone path table, and the tone path information assigned one-to-one to the tone source number. The identifier VCI is retrieved (step S4). Then, the subscriber call processing unit 11 controls the time switch connection processing unit 14 through the control line, connects the tone device 13 and the time switch, and switches the time switch to the occupied state (step S5). Subsequently, the subscriber call processor 11 searches the channel resource table for the AAL1 / PCM matching device 15 connected one-to-one with the time switch (step S6), and the channel of the AAL1 / PCM matching device 15 in the idle state. When it is confirmed that there is a resource (step S7), the channel is switched to the occupied state in the channel resource table for the AAL1 / PCM matching device 15, and the time switch connection processing unit 14 is controlled through the control line to time switch. And AAL1 / PCM matching device 15 channel (step S8). In addition, the subscriber call processor 11 controls the 155 Mbps class access device 16 through a control line and connects the 155 Mbps class access device 16 to the ATM switching system 20 through the 155 Mbps class access device 16. The AAL1 / PCM matching device 15 establishes a path connection, but receives the virtual path identifier VPI and the virtual channel identifier VCI for the tone source that the subscriber call processor 11 retrieves in step S4 via the control line. When the AAL1 / PCM matching device 15 transmits the tone of the tone device 13 to the ATM layer AAL1 cell and transmits the tone to the ATM switching system 20, the AAL1 / PCM matching device 15 transmits the corresponding virtual channel identifier (VCI) and the virtual path identifier (VPI). In addition to the header of the cell, the tone path with the ATM switching system 20 is established by transmitting to the ATM switching system 20 via the 155 Mbps class access device 16. Thereafter, the subscriber call processor 11 checks whether there is a tone path without path setting for the tone source that can be provided by the system (step S10), and returns to step S2 if a tone path without path setting exists. Repeat the operation, and if the tone path has not been set, the operation is terminated. On the other hand, if a tone path is established between the circuit switching system 10 and the ATM switching system 20, the tone path of the circuit switching system 10 is continuously supplied to the ATM switching system 20 by not semi-permanently releasing the corresponding tone path. do.

Accordingly, the ATM switching system 20 includes tone source path information that records a virtual path identifier (VPI) and a virtual channel identifier (VCI) corresponding to the tone path information corresponding to the tone source. Based on the virtual channel identifier (VCI) and virtual path identifier (VPI), the desired tone can be connected and used.

As described above, the present invention provides tones through a semi-permanent fixed path from the synchronous circuit switching system interworking with the ATM switching system to the ATM switching system, thereby economically and efficiently providing the tone for the ATM switching system.

Claims (4)

Retrieving the tone path information of the tone source by retrieving a virtual path identifier and a virtual channel identifier allocated one-to-one with the tone source when the system is started; Connecting the tone device and the time switch; Retrieving a channel resource table for the AAL1 / PCM matching device; Connecting a channel of the time switch and an AAL1 / PCM matching device; And connecting the AAL1 / PCM matching device to an ATM switch through a 155 Mbps access device. The method of claim 1, And transmitting the virtual channel identifier and the virtual path identifier corresponding to the tone by adding the virtual channel identifier and the virtual path identifier corresponding to the tone to the header of the transmitting cell when the circuit switching system makes the tone into an ATM layer AAL1 cell and transmits the tone to the ATM switching system side. A tone providing method from a circuit switching system to an ATM switching system. The method according to claim 1 or 2, And a tone path connected between the circuit switching system and the ATM switching system is not semi-permanently released from the circuit switching system. The method according to claim 1 or 2, The ATM switching system includes tone source path information that records a virtual path identifier and a virtual channel identifier corresponding to the tone path information corresponding to the tone source, and when desired, the desired tone based on the virtual channel identifier and the virtual path identifier. Providing a tone from the circuit switching system to the ATM switching system.