KR100194816B1 - Call Control Method in Subscriber Unit of Public Communication Network of Asynchronous Transfer Mode Switching System - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Call Control Method in Subscriber Unit of Public Communication Network of Asynchronous Transfer Mode Switching System

2. The technical problem to be solved by the invention

The purpose of the present invention is to provide a call control method for receiving an analog subscriber in a PSTN subscriber matching device of an asynchronous transfer mode (ATM) switching system and connecting a call with an asynchronous transfer mode (ATM) subscriber.

3. Summary of Solution to Invention

PSTN subscriber matching device of asynchronous transfer mode (ATM) switching system performs mapping process corresponding to asynchronous transfer mode subscriber signal in order to accommodate public network subscriber in asynchronous transfer mode switching system. Control call connection.

4. Important uses of the invention

Used for call control in asynchronous transfer mode switching system.

Description

Call Control Method in Subscriber Unit of Public Communication Network of Asynchronous Transfer Mode Switching System

The present invention relates to a call control method for receiving an analog subscriber in a PSTN subscriber matching device of an asynchronous transfer mode (ATM) switching system and connecting a call with an asynchronous transfer mode (ATM) subscriber.

Due to the rapid development of information communication, various demands of users for communication services have increased, and broadband wide area network (B-ISDN) service has been needed to accommodate the demand for broadband communication.

Asynchronous switching mode (ATM) switching system is mainly designed to handle high-speed data, while public telephone network handles low-speed data, and protocols are different. How to accept has not yet been proposed.

Therefore, when the initial asynchronous transfer mode (ATM) switching system is used as an element of the network, there is a need for an effective method for providing existing public telecommunication network services to general subscribers in the asynchronous transfer mode switching system.

Accordingly, the present invention provides a PSTN subscriber matching device of an asynchronous transfer mode (ATM) switching system in order to activate an asynchronous transfer mode (ATM) service by early realizing public subscriber network service in an asynchronous delivery mode (ATM) network. An object of the present invention is to provide a call control method for controlling a call connection between a subscriber of a public telecommunication network and an asynchronous delivery mode subscriber.

1 is a block diagram of an asynchronous transfer mode (ATM) exchange system to which the present invention is applied;

2 is a block diagram of a PSTN control unit to which the present invention is applied;

3A to 3D are flowcharts of a call connection control according to the present invention;

4A and 4B are flowcharts of a call release control according to the present invention;

* Explanation of symbols for the main parts of the drawings

1: ATM Local Switching Subsystem (ALS)

2: ATM centralized switching subsystem (ACS)

8: PSTN subscriber matching device

In order to achieve the above object, the present invention, in the call control method applied to the public network subscriber matching device of the asynchronous delivery mode switching system, when receiving a call connection signal from the public network subscriber unit initializes the device of the lower layer and time switch Connecting the tone to the subscriber by connecting the first step; A second step of notifying the time switch and tone cutting upon receiving the digit from the public telecommunications subscriber, and driving a timer to transmit the subscriber connection request after receiving the digit; Receive call progress notification, store ongoing call information and change status information, Receive switch link information message, store routing tag information and virtual path identifier / virtual channel identifier (VPI / VCI), and virtual path identifier / virtual channel Transmitting an identifier (VPI / VCI) registration request message to convert the public telecommunication network channel information into an asynchronous delivery mode (ATM) cell information; When receiving an ALERT indication, connect the ringback tone channel time switch to generate a ringback tone, and when receiving a connection response, cut off the ringback tone and the ring back tone time switch, and then transmit a voice channel connection message and send the time signal. Linking the location to make the subscriber state busy and storing and processing call state information; A fifth step of assembling the subscriber number into a basic message upon receiving the calling party connection request, transmitting a SETUP message, storing and processing subscriber information and status information; In case of receiving CALL PROCEEDING message, it analyzes information element and judges whether parameter is normal. If it is normal, it sends call progress notification. If it is not normal, it notifies call connection failure to management layer and then sends call rejection message. A sixth step; When receiving an alert message, it analyzes the information element to determine whether the parameter is normal. If it is normal, it sends an alert display message. If it is not normal, it sends a call rejection message after notifying the management layer of the call connection failure. 7 steps; When receiving a CONNECT message, the information element is analyzed to determine whether the parameter is normal. If it is normal, it sends a connection response message, assembles a CONNECT ACK message, stores the same parameter, and sends it. An eighth step of transmitting a call rejection message after notifying the management layer of the call connection failure; And CONNECT ACK message, analyzes the information element to determine if the parameter is normal and terminates if it is normal. If it is not normal, it notifies the error to the management layer to change the error count and reaches the call. It comprises a ninth step of cutting.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is a schematic diagram of an asynchronous transfer mode (ATM) switching system to which the present invention is applied, and includes a plurality of ATM Local Switching Subsytems (ALS) 1 and an ATM Central Switching Subsystem (ACS). Switching Subsystem (2).

The ATM local switching subsystem 1 operates independently as a minimum system component and transmits the cells from the ATM subscriber matching unit 3 and the PSTN subscriber matching device 8 to match ATM subscribers in basic units. An access switching network module (ASNM) 4 for performing a non-blocking self-routing exchange function and an ATM controller 5 for controlling an ATM call processing function are provided.

The ATM centralized switching subsystem (2) performs an interconnection function between multiple ATM local switching subsystems (1), acting as a distribution unit for high-capacity systems, with non-blocking self-routing exchanges and access switches. Interconnection Switching Network Module (ISNM) 6 which performs an internal module interface (IMI) function, which is a physical connection with the network module unit 4, and a system controller for controlling the system 7 ).

The PSTN subscriber matching device 8 includes a PSTN subscriber unit 9 that performs an analog subscriber interface and a global bus matching function, a time slot switching function, an aggregation function, an ATM matching unit ( 12) a time switch unit 10 performing a matching function with a call signal to a subscriber line, a conference call function, a voice recording guide service, a signal and service unit 11 performing a common bus matching function, and user information. ATM matching unit 12, which performs the internal ATM adaptation layer (IAAL: IPC AAL) function for ATM adaptation layer 1 (AAL 1) processing and internal processor communication (IPC) messages, and the public performing call processing of analog subscribers. A communication network (PSTN) control unit 13 is provided.

The present invention is carried out by being located in the public communication network (PSTN) control unit 13 in the public communication network (PSTN) subscriber matching device (8).

FIG. 2 is a block diagram of a PSTN control unit to which the present invention is applied, in which 20 is a call connection processor, 21 is a signal processor, 22 is a time switch processor, and 23 is a mapping processor.

In order to process an analog subscriber call and connect a call with the ATM control unit 5, the public communication network (PSTN) control unit 13 performs a call connection processing unit 20 that performs a control procedure related to an originating / incoming call performing a call connection. Signal processing unit 21 for providing recording guidance and signal service for the time, the time switch processing unit 22 for connecting and cutting the time switch, the mapping processing unit 23 for mapping the PSTN signal and ATM signal by the mapping procedure ).

3A to 3D are flowcharts of call connection control according to the present invention.

When the call connection processing unit 20 of the public network control unit 13 receives a subscriber hookoff, which is a call connection signal, from the public network subscriber unit 9 (100), to connect a dial tone to the public network subscriber. The lower layer hardware (H / W) device is initialized (101), an idle channel is selected from the time switch resources, the time switch is connected (102), and the tone connection is performed to the subscriber (103).

Receiving a digit from the public network subscriber (104), the connected time switch is cut (105) and the tone cut is notified (106). At this time, the digit reception timer is immediately driven to perform the procedure for receiving the next digit (107). When receiving a digit from the subscriber (108), it is checked whether the driven timer value has expired (109). If not, the digit receiving process is continued. And transmits the data to the mapping processing unit 23 (110).

If the call progress notification is received from the mapping processor 23, the call is stored when the call is in progress, the state information is changed (112), and when the switch link information message is received (113), it is used to transmit and receive to the ATM switching system. To store the virtual path identifier / virtual channel identifier (VPI / VCI) allocated for the subscriber channel in the call processing and call processing (114) and to operate the hardware (H / W) virtual path identifier / virtual channel An identifier (VPI / VCI) registration request is transmitted to convert the public telecommunication network channel information into ATM cell information (115).

In addition, when an alert indication is received from the mapping processor 23 (116), the time switch for the ringback tone channel is connected (117) to generate a ringback tone so as to connect the ringback tone to the subscriber who has requested the connection (116). 118). When the connection response is received from the mapping processor 23 (119), the ring back tone is disconnected (120), the ring back tone time switch is disconnected (121), and a voice channel connection message is transmitted (122). When the time switch of the area is connected (123), the subscriber's state becomes a busy state and stores and processes call state information (124).

Upon receiving the calling party connection request from the call connection processing unit 20 (201), after assembling the Q.2931 basic message with the corresponding subscriber number (202), the SETUP message is settled through the ATM matching unit 12. (203). At this time, the subscriber information and Q.2931 state information is stored and processed (204).

If the CALL PROCEEDING message is received from the ATM processing unit through the ATM matching unit 12 (204), the length and contents of the corresponding information elements are analyzed (206), and compared with the initial parameters stored internally (206). 207) If normal, the call progress notification is transmitted to the call connection processing unit 20 (209). If not normal, the call connection processing message 20 is transmitted to the call connection processing unit 20 after notifying the management layer that the call connection has failed (208). ).

In addition, upon receiving the alert message from the ATM processor through the ATM matching unit 12 (210), the length and contents of the corresponding information elements are analyzed (211), and compared with the initial parameters stored internally (212). An ALERT indication message is transmitted to the call connection processing unit 20 (214). If it is not normal, a call connection rejection message is transmitted to the call connection processing unit 20 after notifying the management layer that the call connection has failed (213).

If the CONNECT message is received from the ATM processor according to the calling party connection request 201 (215), the length and contents of the corresponding information elements are analyzed (216) and compared with the initial stored parameters (217). If normal, a connection response message is transmitted to the call connection processing unit 20 (218), and a connection response (CONNECT ACK) message is assembled to the ATM processing unit to store and transmit the same parameter (220). If the received parameter is not normal, the call connection failure message is transmitted to the call connection processing unit 20 after notifying the management layer that the call connection has failed (219).

When the subscriber call receives a CONNECT ACK message from the ATM processor immediately after receiving the connection notification (221), the length and contents of the corresponding information elements are analyzed (222), and compared with the initial stored internal parameters (223). If it is not normal, if it is not normal, it notifies the management layer of an error, changes the error count, and disconnects the call connection when reaching a predetermined number of times (224).

4A and 4B are flowcharts of a call release control according to the present invention.

When the call connection processing unit 20 receives the subscriber hook-on from the public network subscriber unit while the subscriber call is busy (300), the virtual path identifier / virtual channel identifier (VPI / VCI) information table corresponds to the corresponding virtual line number for the subscriber line number. In order to delete the path identifier / virtual channel identifier (VPI / VCI) information (301) and to release the corresponding hardware (H / W), the virtual path identifier / virtual channel identifier (VPI / VCI) deregistration message is transmitted (302). . Thereafter, it is determined whether the state of the previous call was busy (303). If not, the call is terminated. If the call is busy, the call is sent to the time switch processor 22 to cut the time switch allocated and connected to the calling party. (304) A call release request is sent to the ATM processing unit (305).

When the called party disconnects the call while the call is in a call, when the call release indication is received by the mapping processor 23 (306), the virtual path identifier / virtual channel identifier for the connected time slot of the time switch processor 22 ( The VPI / VCI) table is processed (307) and the virtual path identifier / virtual channel identifier (VPI / VCI) deregistration message is transmitted (308) to release the hardware (H / W). In addition, after transmitting a call tone to the calling party (309) and performing a hook-on process for the called party and the calling party (310), all connected time switches are cut (311).

When the mapping processing unit 23 receives the call release request from the call connection processing unit 20 (400), the subscriber number is assembled with the Q.2931 basic message (401), and then a RELEASE message is transmitted to the ATM processing unit. The call is released (402).

If the called party releases the call, when the mapping processor 23 receives the RELEASE message from the ATM processor (403), the length and contents of the corresponding information elements are analyzed (404) and the initial parameters stored internally. If the comparison is the same (405), if it is normal, the call release indication message is transmitted to the call connection processing unit 20, and if it is not normal, an error notification process is performed (407).

In addition, when the connected call is immediately released by originating or receiving, when receiving a RELEASE COMPLETE message from the ATM processor (408), the length and contents of the corresponding information elements are analyzed (409) to see whether they are the same as the initial stored parameters. Compare (410) and terminate if normal, and if not normal, transmit an error notification process (411).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

In the present invention as described above, the asynchronous transfer mode (ATM) switching system is directly connected to the asynchronous transfer mode (ATM) signal in an asynchronous transfer mode (ATM) switching system according to the asynchronous transfer mode (ATM) signal without passing through other subscriber interworking devices By accommodating public network subscribers, the flexibility and scalability of the asynchronous delivery mode (ATM) switching system are improved, and the asynchronous delivery mode (ATM) service can be activated by early realization of public subscriber service in the asynchronous delivery mode (ATM) network. It can be effective.

Claims (2)

A call control method applied to a subscriber station in a public communication network of an asynchronous delivery mode switching system, A first step of initializing a device of a lower layer and connecting a time switch to connect a tone to a subscriber when receiving a call connection signal from a public telecommunication network subscriber; A second step of notifying the time switch and tone cutting upon receiving the digit from the public telecommunications subscriber, and driving a timer to transmit the subscriber connection request after receiving the digit; Receive call progress notification, store ongoing call information and change status information, Receive switch link information message, store routing tag information and virtual path identifier / virtual channel identifier (VPI / VCI), and virtual path identifier / virtual channel Transmitting an identifier (VPI / VCI) registration request message to convert the public telecommunication network channel information into an asynchronous delivery mode (ATM) cell information; When receiving an ALERT indication, connect the ringback tone channel time switch to generate a ringback tone, and when receiving a connection response, cut off the ringback tone and the ring back tone time switch, and then transmit a voice channel connection message and send the time signal. Linking the location to make the subscriber state busy and storing and processing call state information; A fifth step of assembling the subscriber number into a basic message upon receiving the calling party connection request, transmitting a SETUP message, storing and processing subscriber information and status information; In case of receiving CALL PROCEEDING message, it analyzes information element and judges whether parameter is normal. If it is normal, it sends call progress notification. If it is not normal, it notifies call connection failure to management layer and then sends call rejection message. A sixth step; When receiving an alert message, it analyzes the information element to determine whether the parameter is normal. If it is normal, it sends an alert display message. If it is not normal, it sends a call rejection message after notifying the management layer of the call connection failure. 7 steps; When receiving a CONNECT message, the information element is analyzed to determine whether the parameter is normal. If it is normal, it sends a connection response message, assembles a CONNECT ACK message, stores the same parameter, and sends it. An eighth step of transmitting a call rejection message after notifying the management layer of the call connection failure; And When receiving the CONNECT ACK message, it analyzes the information element to determine if the parameter is normal and terminates if it is normal. If it is not normal, it notifies the error to the management layer, changes the error count, and reaches the predetermined number of times. A call control method in a subscriber station of a public telecommunication network of an asynchronous delivery mode switching system comprising a ninth step of cutting. The method of claim 1, When a caller receives hook-up while in a busy state, the virtual path identifier / virtual channel identifier information for the subscriber line number is deleted from the virtual path identifier / virtual channel identifier (VPI / VCI) information table and the virtual path identifier / virtual channel identifier is registered. A tenth step of determining whether a previous call state was busy after sending a release message and ending if not in a call, if the call was busy, transmitting the time switch disconnect signal and sending a call release request; When the call release indication is received, the virtual path identifier / virtual channel identifier table for the timeslot is changed, the virtual path identifier / virtual channel identifier deregistration message is sent, the caller is sent to the calling party and the called party and the calling party are sent to the called party and the calling party. An eleventh step of cutting all connected time switches after performing the hook-on processing with respect to each other; Receiving a call release request, assembling the subscriber number into a basic message, and then transmitting a RELEASE message to release the call; A thirteenth step of analyzing the information element upon receiving a RELEASE message to determine whether the parameter is normal, if it is normal, to transmit a call release indication message, and if not, to notify the management layer of an error; And And receiving a RELEASE COMPLETE message, analyzing the information element to determine whether the parameter is normal, ending if it is normal, and sending it to the management layer to notify the error if it is not normal. A call control method in subscriber interface of public telecommunication network in asynchronous transfer mode switching system.