KR100438233B1 - Call Connection Method used Common Channel Signalling Module in AICPS - Google Patents

Abstract

The present invention relates to a method for processing a call requested by a PSTN subscriber to AICPS according to a common line signaling method.

In the conventional channel signaling method, a signal required for transmission of traffic carried through a single channel is transmitted through a specific signal channel fixed to the channel itself or fixed thereto. In this method, the signal transmission is made through the call line in the call setup or recovery phase, and in principle, the signal transmission is impossible during the call.

In the present invention, the CNAS included in AICPS receives and distributes a connection request message by using common line signaling to accept and process a call requested by a PSTN subscriber between AICPS and the AICPS. Call connection according to common line signaling is performed.

Description

Call Connection Method Used Common Channel Signaling Module in AICPS in Mass Communication System

The present invention relates to a method for processing a call requested by a PSTN subscriber to AICPS according to a common line signaling method.

The amount of information through existing networks is increasing exponentially due to the ever-expanding expansion of data communication and various services, and various networks and VAN operators are emerging. In addition, the form and protocol of a network for providing data services is changing at a very high speed as well as its diversity. A large capacity communication processing system is needed to meet the requirements of diversity, speed and high speed processing.

In other words, by establishing information service distribution base through various network matching (PSTN, PSDN, Internet, FR, ISDN), and by creating additional services in the existing telephone network, diversification and activation of services by establishing an open VAN business base In preparation for the market opening, the rapid increase of data network access lines is expected due to the activation of information and communication, while the development of new systems is emerging due to the limitation of the function and capacity of the existing ICPS.

According to this need, an advanced information communication processing system (AICPS) has been developed, and is composed of a LAN switch (ESAS) for connecting various subsystems and a subsystem connected thereto. Sub-system consists of TNAS department for telephone network, INAS department for ISDN network, WNAS department for Internet network, PNAS department for packet network, FNAS department for frame relay network and ANAS department for ATM network. It consists of OAM part (ONAS + LOMS) that manages and maintains it as a whole. In addition, there is WARP as a server for Internet billing agency.

On the other hand, in data communication, when information is to be transmitted and received between two points, it is also necessary to transmit and receive control information for call connection or release in addition to the original information that the user wants to transmit. Such control information is called a signal, and a signal transmission system is called a signal method.

In the communication network, the signaling method depends on the function and performance of the exchange and the terminal device and the characteristics of the transmission method since the transmission and reception of the signal is performed through the transmission and switching medium.

In addition, since the call connection in the communication network exchanges the information after the exchange of signal information, the signaling method determines the performance of the entire communication network. In order to exchange information between users, it is necessary to process various access control information accurately and quickly between nodes in a communication network.

In general, the telephone network matching device of the Advanced Information Communication Processing Subsystem (AICPS) is a trunk interface for making a service provided by an IP / CP host available to users of an existing public switched telephone network (PSTN). In the related art, as the trunk interface, conventionally, R2 signaling (call path signaling) or CAS (Channel Association Signaling) signaling has been used.

The conventional AICPS telephone network matching device is a connection type using a call path signaling method. A call path signaling method is a method of transmitting signal information necessary for controlling each call line through a corresponding call line, and the signal line and the call line are separated. Most of the conventional signaling methods are not included.

In addition, in CAS signaling, signal transmission is performed through a call line in the call setup or recovery phase, and in principle, signal transmission is impossible during a call.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to enable a call connection according to a common line signaling method between a telephone exchange and an AICPS connected to a PSTN.

1 is a system conceptual diagram for applying a common line signaling scheme between a conventional telephone exchange and an AICPS.

2 is a diagram illustrating a call connection process according to a common line signaling method.

* Description of the symbols for the main parts of the drawings *

10: exchange 100: AICPS

12: STP 14: CNAS

16: TNAS

A feature of the present invention for achieving the above object is the process of receiving a call connection request message transmitted by the telephone exchange through the STP in accordance with the call connection request of the PSTN subscriber; Receiving the call connection request message and extracting a signal point and a line identification number included in the received call connection request message; Searching a call distribution table to select a TNAS corresponding to the signal point and a circuit identification number, and a link and a channel provided in the TNAS; Transmitting the call connection message on a channel of the TNAS; The present invention provides a call connection method using a common line signaling method of a high-volume communication processing system, the method comprising receiving a response message for the call connection request from a TNAS.

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

Common channel signaling module (Common Channel Signaling Module) is a method of forming a dedicated signal line only for signal transmission separately from the call line and transmits a signal for controlling several call lines using the signal line.

Since the common line signaling method transmits and receives signals using a signal-only data link, it enables high-speed transmission of dial information and the like, and at the same time reduces the delay of the automatic connection until the call line is connected (the time until the dial tone is heard). There is a number. In addition, the common line signaling system separates the communication line from the call line, so that a signal-only line and a device are configured so that the signal can be transmitted in both directions regardless of the state of the call line. In addition, since only the signal line can be connected and the database can be accessed remotely, services such as Free Dial can be provided. In the common line signaling system, since the call line and the signal line are configured independently from each other, bidirectional operation of the call line becomes easier.

1 is a system conceptual diagram for applying a common line signaling method between a conventional telephone exchange and AICPS.

In order to apply the common line signaling method between the conventional telephone switch and the AICPS 100, the AICPS 100 must include a telephone network access subsystem (TNAS) 16 and a common channel signaling network access subsystem (CNAS 14). There must be a Signaling Transfer Point (STP) 12 between the exchange 10 and the AICPS 100.

The TNAS 16 performs a matching function between the AICPS 100 and the PSTN and provides a trunk interface so that users of the existing PSTN can use the services provided by the IP / CP host. That is, the TNAS 16 satisfies the condition of the interface (E1) with the telephone exchange 10, performs a function of collecting and confirming subscriber telephone numbers connected to the telephone exchange 10, and various signals and connection conditions related to PSTN connection. To satisfy. The TNAS 16 performs signal matching between stations via a digital relay line, a connection function between a service processor and a line connection, and a hardware fault collection and reporting function.

The CNAS 14 serves as a matching device for accommodating common line signaling, and receives a signal message and delivers it to the corresponding TNAS 16. The CNAS 14 also performs an MTP (Message Transfer Part) function for processing No. 7 protocol to accommodate IDN (ISDN User Part) signaling, while an ISUP call for processing an ISUP message received from the MTP. It performs a processing function and performs an internal interface processing function with the TNAS 16.

The STP 12 is responsible for routing the network, checks the routing information of the call, and sends it to the destination. STP 12 uses a common line signaling scheme to send messages to CNAS 14.

2 is a diagram illustrating a call connection process according to a common line signaling method.

First, in response to a call connection request of a PSTN subscriber, the telephone exchange transmits a call connection request message to the CNAS 14 via STP. Accordingly, the CNAS 14 receives the call connection request message and transmits it to the TNAS 16. (S21). Since a plurality of TNASs 16 are connected to the CNAS 14, the CNAS 14 uses a signal point and a circuit identification code (CIC) included in the received call connection request message to transmit corresponding TNASs (CICs). The call is distributed to 16). To this end, the CNAS 14 analyzes the call connection request message, extracts a signal point and a circuit identification number (S22), and then searches for a call distribution table provided in the CNAS 14 (S23), corresponding to TNAS ( 16), and after selecting the link and the channel provided in the TNAS 16, the call connection message is transmitted to the corresponding channel (S24, S25).

In response, the TNAS 16 performs a call processing procedure separate from that of the existing AICPS 100 to initiate call classification and management of modem resources, thereby providing a CNAS response message for a call connection request for call processing. Transfer to step 14 (S26). As a result, a call establishment process of the common line signaling method is performed, and the user terminal may receive the same service as in the conventional AICPS 100 (S27).

Then, when the user wants to terminate the service is received a call release request. At this time, a call release process by call release (calling point recovery) or call release (calling point recovery) from the user terminal is performed. Finally, it sends a response message for the call release and recovers all resources.

Although the present invention has been described in detail only with respect to the above-described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the present invention, and such modifications or changes are within the scope of the claims of the present invention. Will belong.

As described above, the present invention is common between the telephone exchange and the AICPS connected to the PSTN by performing the connection request message reception and distribution by the CNAS included in the AICPS to accept and process the call requested by the PSTN subscriber in the AICPS. Perform call connection according to the line signaling method.

Claims (1)

Receiving, by the telephone exchange, a call connection request message transmitted through the STP according to a call connection request of the PSTN subscriber; Receiving the call connection request message and extracting a signal point and a line identification number included in the received call connection request message; Searching a call distribution table to select a TNAS corresponding to the signal point and a circuit identification number, and a link and a channel provided in the TNAS; Transmitting the call connection message on a channel of the TNAS; Receiving a response message for the call connection request from the TNAS Call connection method using a common line signaling method in a high-capacity communication processing system.