KR0173378B1 - How to provide incoming trunk line call in asynchronous delivery mode switching system - Google Patents

Abstract

The present invention relates to an incoming trunk line call providing method in an asynchronous transfer mode (ATM) switching system, comprising: receiving a call request message from another station in the incoming trunk line call providing method applied to an asynchronous transfer mode (ATM) switching system; Then create the incoming trunk line caller process, call the system library for station number translation, translate the station number after translation of the station number, set the switch path, save routing tag information of the cell header, and call the subscriber When the reception response signal is received from the host, an address reception completion message is transmitted to the other station.When the connection completion notification is received from the called party, the routing tag information of the cell header is notified so that the data cell can be transmitted, and the response message is sent to the other station. A first step (100 to 119) of transmitting; And receiving a call recovery message in a busy state, performing a recovery procedure to recover the switch path, requesting to recover routing tag information of the cell header, and recovering resources used for call processing (120 to 131). By providing a call control procedure for incoming calls from other stations, the BISUP trunking call can be provided and services for B-ISDN service requests from B-ISDN subscribers of other countries can be provided. It is effective that B-ISDN subscribers can use B-ISDN subscribers and B-ISDN services in their own countries.

Description

How to provide incoming trunk line call in asynchronous delivery mode switching system

1 is a schematic structural diagram of an ATM VC switching system to which the present invention is applied.

2 is a software functional block structure diagram for performing call processing in an ATM VC switching system to which the present invention is applied.

3 (a) to (c) is a flow chart of an embodiment of the incoming trunk line call providing method according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Network matching connection switching subsystem (ALS / T)

2: User Match Connection Exchange Subsystem (ALS / S)

3: Voice subscriber interworking exchange subsystem (IWS / S)

4 central switching subsystem (ACS) 5 trunk matching module (TIM)

6,10: Connection Switching Network Module (ASNM) 7,11: Call / Connection Control Processor (CCCP)

8 Subscriber Registration Module (SIM) 9 Disconnected Service Module (CLSM)

12: ATM interworking module (AIWM) 13: time switch module (TSWM)

14: Analog Line Connection Module (ALAM) 15: Signaling / Service Module (SSM)

16: Analog Connection Switching Module (AASM) 17: Internal Switching Network Module (ISNM)

18: Operational Maintenance Processor (OMP)

The present invention relates to a method for providing an incoming trunk line call in an asynchronous transfer mode (ATM) switching system. In particular, a subscriber of a broadband integrated services digital network (B-ISDN) originating in another station can use a common line signaling method No. 7 A method for providing an incoming relay line in an asynchronous transfer mode (ATM) switching system for providing a call when making a call with a B-ISDN called subscriber in a country using B-ISDN User Part (BISUP) signaling method It is about.

At present, the evolution of telecommunication networks from narrowband-ISDN to broadband-wide Telecommunication Network (B-ISDN) is underway, and countries around the world are paying attention to the development of ATM (Asychronous Transfer Mode) exchange.

With the evolution of the network, the common-line signaling method (No. 7) ISDN user part (ISUP), which has been provided for the control of the trunk line trunk call, is required to meet the requirements of the B-ISDN in signaling. A solution to this problem is BISUP, which performs relay line call control for B-ISDN subscribers.

Accordingly, the present invention has been made in order to meet the above-mentioned requirements is an asynchronous delivery mode (ATM) that allows B-ISDN subscribers of other countries to call or service B-ISDN recipients of their own countries using No.7 BISUP signaling method The objective is to provide a method for providing incoming trunk line calls in an exchange system.

In order to achieve the above object, the present invention provides a method for providing a relay trunk line call applied to an asynchronous transfer mode (ATM) switching system, wherein after receiving a call request message from another station, a call resource to be used is examined. Create the incoming relay line call processor process to read the insertion digit information for the incoming route from the database and notify the other station of the response signal for the call request, and call the system library for the translation of the station number After translating the called number after translation, requesting setup for setting the switch path, setting the switch path, storing routing tag information of the cell header, and receiving a response signal from the called subscriber to another station. When the address reception completion message is sent and the connection completion notification is received from the called party, A first step of notifying the tagging information so that the data cell can be transmitted and sending a response message to another station; And when a call recoverer receives a call recovery message while in a busy state, generates and sends a recovery completion message to another station if the originating pressor requests recovery, and notifies the called party of recovery, and receives a request for recovery from the called party. When the recovery request message is sent to the other station and the recovery completion message is received from the other station, the switch path is restored and the trunk matching module control block is required to recover the routing tag information of the cell header, and recovers the resources used for call processing. And a second step.

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

FIG. 1 is a schematic structural diagram of an ATM VC (Virtual Channel) switching system to which the present invention is applied. In the drawing, '1' is an ATM Local Switching Subsystem (ALS / T) and '2'. Is an ATM local switching subsystem / subscriber (ALS / S), '3' is an Interworking switching Sybsystemd / analog Subscriber (IWS / S), and '4' is a central switching sub ATM Central Switching Subsystem (ACS), '5' is Trunk Interface Module (TIM), '6' and '10' are Access Switching Network Module (ASNM), '7' and '11' is a Call and Connection Control Processor (CCCP), '8' is a Subscriber Interface Module (SIM), '9' is a ConnectionLess Service Module (CLSM), '12' is ATM Inter Working Module (AIWM), '13' is Time Switch Module (TSWM), '14' Analog Line Access Module (ALAM), '15' is Signaling and Service Module (SSM), '16' is Analog Access Switching Module (AASM), '17 '' Represents an Inter Connection Switch Network Module (ISNM) and '18' represents an Operation and Maintenance Processor (OMP).

The ATM switching system is basically composed of three parts: an access switching subsystem (ALS) 1, 2, a central switching subsystem (ACS) 4, and an interworking switching subsystem (IWS / S) 3 for voice subscribers. It consists of subsystems.

The ALS 1, 2 can operate as a concentrating device having a constant condensation ratio with the ACS 4, and the ACS 4 acts as a distribution device that performs the interconnection function between the ALSs 1, 2.

The IWS / S / (3) is connected to the switch network of the ALS (1,2) and the internal inter-module interface (IMI), and is a subsystem for PSTN voice subscriber matching.

ALS (1,2) is ALS / S (2) for B-ISDN user matching, ALS / T (1) for network matching and ALS / ST (ALS / B-ISDN Subscriber) that accepts network matching with users. and Trunk). As the aggregation device, the ALS / S 2 may have an aggregation ratio of n * m in which the number of links on the user side is n (based on 155Mbps) and the number of links on the switch (ACS) side is m.

The ALS / S 2 includes a subscriber matching module (SIM) 8 for connection with a subscriber, a connectionless service module (CLSM) 9 for accommodating a connectionless subscriber, and an access switch network module for performing a switching function. (ASNM) 10, and a call connection control processor (CCCP) 11 that performs call connection and control.

In addition, ALS / T (1) is a trunk matching module (TIM) (5) for connecting to the other switching network, the connection switch network module (ASNM) (6) for performing a switching function, and call connection for performing call connection and control A control processor (CCCP) 7 is provided.

The ACS 4 performs call number translation for internal calls and incoming calls during call / connection control, and routes control for each relay line for outgoing calls or relay calls.

ACS (4) is connected to ASNM (1,2) of ALS (1,2) and IMI to manage the operation and maintenance of the whole system and internal connection name module (ISNM) 17 which performs switching between ALS. Operational Maintenance Processor (OMP) 18 is provided to perform various input / output control functions with the operator as well as system level maintenance, test, measurement and statistics functions.

The interworking exchange subsystem (IWS / S) 3 for the reception of the analog voice subscriber is an ATM interworking module (AIWM) 12 connected with the ASNM 10 of the ALS / S 2, and a time switch performing a switching function. A module (TSWM) 13, an analog line connection module (ALAM) 14 for connection with an analog subscriber, a signaling service module (SSM) 15, and an analog connection exchange module (AASM) 16.

2 is a software functional block diagram for performing call processing in an ATM VC switching system to which the present invention is applied.

The overall call control procedure is described below with reference to FIG.

When the call request is generated from the subscriber and the relay line, the ALS (1, 2) detects this, performs the call service, and makes a call translation or routing request to the ACS (4) after the translation of the station number under the control of the originating ALS. The ACS 4 designates the ALS (1, 2), the destination ALS selects the optimal route and notifies the originating ALS, and the originating ALS establishes the call path. The originating ALS counts the cells delivered during the call, sends the billing data to the ACS 4 together with the user requested service type after the call is completed, and the originating / incoming ALS restores the call data to the idle state.

The main call processing software blocks for performing such call control procedures are shown in FIG. 2, and the description of each block is as follows.

BSIF (Broadband Signaling Interface) block 21 performs control and management for signaling connection for reliable transmission of B-ISDN call control messages.

The Subscriber Service Specific Coordination (SSCF) block 22 performs a function of adjusting to apply to the service of the BSIF block 21 for a signaling protocol for a User Network Interface (UNI).

The user part interface (UPIF) block 23 performs a subscriber matching function and matches with a user part control (UPCF) block 24, and the UPCF block 24 performs a function for subscriber call control.

System library blocks include UNI Line Resources Handling (ULRHF) 27, Switch Link Resource Handling (SLRHF) 26, and Number Translation Control in ALS (NTLF) 25.

The UNIR Link Resources Handling (ULRHF) block 27 is a block for UNI resource management, and the Switch Link Resources Handling (SLRHF) block 26 generates a routing tag of a switch control and a cell header. NTLF (Number Translation Control in ALS) block 25 is a system library block for station number translation.

The Trunk Service Specific Coordination (TSCF) block 28 performs a function of adjusting a signaling protocol for a network node interface (NNI) to be applied to a service of a BSIF.

The SMTP-3 Signaling Message Handling (SMHF) block 29 is a block that performs the MTP-3 function in No.7 signaling.

The NNI Protocol Interface (NPIF) block 30 performs the MTP-3 and B-ISDN user part matching function, and the NNI Protocol Control (NPCF) block 31 performs B-ISDN user code control.

In addition, there are an NTCF (Number Translation Control in ACS) block 32 for incoming call translation and a RTCF (Routing Control) block 33 for routing control.

In addition, a MA (Management Administration) block 34 and an I / O device 35 are provided for network management.

The NPCF block 31 includes a main process, an incoming call process, and an outgoing call process.

3 (a) to (c) is an exemplary flowchart of an incoming trunk line call providing method according to the present invention, and the third (a) or incoming trunk line call in the main process of the NPCF block 31 is shown. Incoming trunk line call processor generated by the main process of the third (b) and (c) or NPCF (31) block to show a procedure for creating a child process for performing A flowchart of a method of providing a call of a process is shown.

First, when the NPCF block 31 receives an initial address message that is a call request message from another station (100), the main process checks the call resource to use (101), and if the call resource is not available, fails for the call request. A message is generated and notified to another station (102), and if a call resource is available, an incoming trunk line call processor process is generated (103).

The main process then transitions to the initial state (Idle) and waits for the reception of a message for another call request.

The incoming trunk call processor process reads the insertion digit information about the incoming route from the database (104) and, if there is an insertion digit, adds the insertion digit at the beginning of the incoming call number received from another station to translate the station number. And called number translation.

In operation 105, an acceptance message for the initial address message, which is a call request message, is generated to another station and notified as a response signal for the call request.

The system library for translating the next station number is called (106), and after receiving the library, it receives information about the incoming call address and the station number that are received by the local station as a return value.

After translating the station number, request the translation of the called party to NTCF (Number Translation Control) block 32 to receive information about the called party (107), and then perform the current call processing by checking the ALS, SIM, and link number to which the called party belongs. It is determined whether the ALS belonging to the in-process process and the process for the called party call belong to the same (108), and if it is not the same, the reserved switch path (109) is reserved (109). The setup request is requested to the called party including information about the destination (110). If the same ALS is requested, setup is requested to the subscriber including the outgoing subscriber information (110).

Upon receiving a response message for a setup request from the called party (111), if it is not a call handled within the same ALS (112), the system library is called to restore the reserved switch path, and the optimal switch path selected by the called party is selected. After notifying (113), routing tag information of the cell header (Cell Header) between originating and terminating subscribers is stored (114). In the case of a call within the same ALS, routing tag information of the cell header between the calling / calling subscriber is stored (114).

When the reception wait response signal is received from the called subscriber (115), an address reception completion message is transmitted to the other station (116).

Upon receiving the connection completion notification from the called subscriber (117), the trunk matching module control block notifies the routing tag information of the cell header so that the data cell can be transmitted (118).

A response message is sent to another station (119), and the state of the call becomes a busy state (120).

In the busy state, the service is provided between the calling party and the called party, and after the service is terminated, the call recovery procedure is performed, and the call recovery procedure is performed by the recovery request of the calling party.

When the call recovery message is received (121), it is determined whether the message is received from the called party or the message from the calling subscriber (122). If the calling subscriber requests the recovery, a recovery completion message is generated and transmitted to another station (123). After notifying the recovery to the called party (124), it is determined whether it is the same ALS (128).

When receiving a recovery request from the called party, the child process transmits a recovery request message to another station (125), and when receiving a recovery completion message from another station (127) in a waiting state (126), determines whether it is the same ALS. (128).

If the call is not in the same ALS, after the switch path is restored (129), the trunk matching module control block is required to recover routing tag information of the cell header (130).

If the call is within the same ALS, the trunk matching module control block requests to recover routing tag information of the cell header (130), recovers the resources used for call processing (131), and the call processor process is destroyed.

The present invention made as described above provides a BISUP incoming relay line call by performing a call control procedure for a call received from another station, and can provide a service for a B-ISDN service request from a B-ISDN subscriber of another station. As a result, B-ISDN subscribers in other countries can use their B-ISDN subscribers and B-ISDN services.

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

Claims (3)

In the incoming trunk line call providing method applied to the asynchronous transfer mode (ATM) switching system, when a call request message from another station is received, the incoming call resource message is examined, and then the incoming relay line call processor process is created and then entered. Read the insertion digit information about the relay route from the database and notify the other station of the response signal for the call request, call the system library for the station number translation, translate the station number after the station number translation, and switch the route (Switch After setting up the switch path by setting up the path for setting, save routing tag information of the cell header, and when receiving a response signal from the called subscriber, send address completion message to other station and connect from called subscriber. Upon receipt of the completion notification, the routing tag information of the cell header is notified to transmit the data cell. First step (100 to 119) to transmit a response message to another station; And when a call recovery message is received in a busy state, when the calling subscriber requests recovery, a recovery completion message is generated and sent to another station, the called party is notified of the recovery, and when a call request is received from the called subscriber. When the recovery request message is sent to the other station and the recovery completion message is received from the other station, the switch path is restored and the trunk matching module control block is required to recover the routing tag information of the cell header and recovers the resources used for the call processing. Incoming trunk line call providing method comprising a second step (120 to 131). The first step (100 to 119), the main process of the NPCF block 31 is used when the NPCF (Network Protocol Control) block 31 receives an initial address message that is a call request message from another station; After checking the call resource to be used, if the call resource is not available, a failure message for the call request is generated and notified to the other station.If the call resource is available, the incoming relay line call processor process is created. 100 to 103); After performing the third step (100 to 103), the incoming trunk call processor process reads the insertion digit information about the incoming route from the database (104) and receives it from another station if there is an insertion digit (104). Add an insertion digit at the beginning of the called party number, generate an acceptance message for the initial address message, which is a call request message to another station, and notify it as a response signal for the call request, and call the system library for station number translation, Number Translation Control) After receiving the information about the called party by requesting the called party number translation in the block 32, the party process and the called party call processing that is currently performing the call processing by checking the ALS, SIM, and link number to which the called party belongs Determining whether the ALS to which the process for which the process belongs is the same; If it is not the same in the fourth step 104 to 108, after the switch path is reserved, setup request is made to the called party including the reserved switch path information and the information on the calling subscriber. A fifth step (109 to 112) of determining whether the ALS is the same when receiving a response message for the setup request from the called subscriber by requesting setup from the subscriber; If the call is not handled within the same ALS in the fifth step (109 to 112), the system library is called to restore the reserved switch path, and the notifying subscriber selects the optimal switch path. Stores routing tag information of cell headers between called subscribers and stores routing tag information of cell headers between calling / called subscribers in case of calls within the same ALS, and then receives a waiting response signal from called subscribers. Sends an address reception completion message to the destination subscriber station and sends a response message to the other station by notifying the routing tag information of the cell header to the trunk matching module control block. Incoming trunk line call providing method comprising six steps (113 to 119). 2. The method of claim 1, wherein the second steps 120 to 131 determine whether the message is received from the called party or the calling party when the call recovery message is received in a busy state. 122); In the third step (120 to 122), when the calling subscriber requests the recovery, a recovery completion message is generated and transmitted to the other station, the called party is notified of the recovery, and when receiving the recovery request from the called subscriber, A fourth step (123 to 128) determining whether the same ALS is received after receiving the recovery request message from another station in a reception waiting state; In the fourth step (123 to 128), if the call is not in the same ALS, after restoring the switch path, the trunk matching module control block is required to recover the routing tag information of the cell header. And a fifth step (129 to 131) of requesting a matching module control block to recover routing tag information of the cell header and restoring resources used for call processing.