KR100205026B1 - Apparatus and method of subscriber's call/link setting-up in atm switching system - Google Patents

Abstract

The present invention relates to a method for establishing a subscriber call / connection in an asynchronous transfer mode switch. In an asynchronous transfer mode switch, an asynchronous transfer mode switch receives a SETUP message from a subscriber terminal, checks a message for an error, allocates a resource that can satisfy a bandwidth and a service quality requested by the subscriber, (VPI) and a virtual channel identifier (VCI) for the mobile terminal, finds the location of the called subscriber through number translation, and occupies the switch link. After confirming the link status of the called subscriber, a SETUP message requesting call / connection setup is transmitted to the called subscriber. Accordingly, in the destination process of the asynchronous transfer mode exchange receiving the first response message from the called subscriber, the connection by the routing tag is established, and in the source process, the connection message is received and the connection by the routing tag is established . Thereafter, the connection setting state is maintained so that the user and the user can exchange information.

Description

Subscriber call / connection establishment apparatus and method in asynchronous transfer mode exchanger

FIG. 1 is a block diagram of a transmission mode exchanger system to which the present invention is applied; FIG.

Figure 2 is a block diagram of the call / connection control processor in Figure 1;

Figure 3 is a flow diagram of a subscriber call / connection setup of the present invention.

4 is a call-side call / connection control flow diagram for a call / connection setup request (SETUP) message in FIG. 3;

5 is a call / call connection control flow diagram for the call / connection setup request signal in FIG.

FIG. 6 is a flow diagram of a switch link band release scheduled in FIG. 3; FIG.

FIG. 7 is a flow chart of connection setup by the routing tag in FIG. 3; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

100, 200: Subscriber subsystem (ALS _o , ALS _k )

110: Subscriber Registration Module (SIM)

120, 220: Access Switch Module (ASNM)

130, 230: Call / Connection Processor (CCCP)

131a ... 131n: call entire control block (UPCF)

135a: Subscriber Link Resource Management Block (ULRHF)

135b: Switch Link Resource Management Block (SLRHF)

136: subscriber link state management block

140, 240, 310: Link Matching Module (LIM)

210: Trunk Line Matching Module (TIM)

300: Central subsystem (ACS)

330: Central Switch Module (CSNM)

340: Operation and Maintenance Processor (OMP)

341: Number translation block (NTCF)

The present invention relates to an apparatus and method for establishing a subscriber call / connection in an asynchronous transfer mode (ATM) exchanger. More particularly, the present invention relates to an apparatus and method for establishing a subscriber call / connection in an asynchronous transfer mode To a subscriber call / connection establishing device and method for dynamically setting and maintaining a connection by which a processor can exchange data between users.

In order to establish a connection between a subscriber and a subscriber in a Broadband Integrated Services Digital Network (B-ISDN), control for call / connection establishment is required in an asynchronous transfer mode (ATM) exchange. Among these broadband integrated information network services, call / connection setup for point-to-point connection communication such as existing telephone and fax data communication needs to be provided in the broadband integrated information network.

Therefore, in order to achieve the above object, the present invention provides a method and apparatus for controlling a call / connection in an asynchronous transfer mode switch and a subscriber in an asynchronous transfer mode switch for considering a service provided in an asynchronous transfer mode And to provide a call / connection setting apparatus and method.

In order to achieve the above object, the present invention provides a subscriber call / connection establishing apparatus and method, wherein when an ATM exchange receives a call / connection setup request message from a subscriber terminal, Allocates resources, manages virtual path identifiers (VPI) and virtual channel identifiers (VCI) for user information transmission, finds the location of the called subscriber through number translation, occupies the switch link, , And a call / connection setup request (SETUP) message to the called subscriber to request call / connection setup with the called subscriber. When the exchange receives the first response message from the called subscriber by the connection, The calling party process establishes the connection by the routing tag, the calling party process receives the connection message, It is set by the connection. Thereafter, the connection setting state is maintained so that the user and the user can exchange information.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

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

The asynchronous delivery mode switching system is composed of an ATM Local Subsystem (ALS) 100 and an ATM Central Subsystem (ACS) 300 interconnecting the subscriber subsystems 100 and 200. do.

The subscriber subsystem 100 for a user network interface (UNI) includes a subscriber interface module (SIM) 110, an access switch module (ASNM) 110, : Access Switch Network Module 120, a plurality of Link Interface Modules (LIMs) 140, and a Call and Connection Control Processor (CCCP) 130 for processing calls / connections.

In addition, the subscriber subsystem 200 includes a Trunk Interface Module (TIM) 210, an Access Switch Network Module (ASNM) 220, a plurality of link matching (NNI) A Link Interface Module (LIM) 240, and a Call and Connection Control Processor (CCCP) 230 for handling calls / connections.

The central subsystem 300 includes a link matching module (LIM) 310, a central switch module (CSNM) 330, an operation maintenance process (OMP) 340 for operation and maintenance .

The signal and user information transmitted from the subscriber terminal are forwarded to the access switch module (ASNM) 120 via the subscriber matching module (SIM) 110 in the asynchronous transfer mode switcher , The dual signaling message is passed to the call / connection control processor 130 via the access switch module 120. [

Thereafter, the call / connection control processor 130 sets and releases the call / connection according to the received signaling message.

At this time, the user information is transmitted to the central switch module (CSNM) 330 via the access switch module (ASNM) 120 according to the routing tag set in the subscriber identity module (SIM) The access switch module (ASNM) in the subscriber registration module, and the subscriber registration module.

The information inputted from the trunk line is transmitted to the central switch module (CSNM) 330 via the access switch module (ASNM) 220 according to the routing tag set in the trunk line matching module (TIM) ALK, an access switch module (ASNM), a subscriber matching module or a trunk line matching module.

FIG. 2 is an internal configuration diagram of a call / connection control processor (CCCP) for setting up a subscriber call / connection.

The call / connection control processor 130 controls a call / connection setup by creating one process in one call, a call control function for managing the state of the call and a call reference number, The connection control function that controls the connection divides the call / connection setting.

That is, the call / connection control processor includes a plurality of UPCF (User Protocol Control Function Blocks) 131a to 131n for controlling the call, a subscriber link resource management block 135a for controlling connection, And a switch link resource management block 135b.

The call control block (UPCF, 131a ... 131n) of the call / connection control processor 130 includes a Number Translation Control Function Block (NTCF) 341 in the OMP 340 for operation and maintenance, To confirm the actual location of the called subscriber.

In addition, the routing tag information for switch routing of the user information is set in the subscriber matching module by communicating with the subscriber matching module (SIM) 110.

Also, the call control block (UPCF) 131a ... 131n communicates with the subscriber link state management block 136 to refer to the subscriber link state.

Figure 3 is a subscriber call / connection flow diagram of the present invention. In a step of processing an origination call / connection setup request (SETUP) message by an originating subscriber subsystem (ALS) call / connection control processor (CCCP), a SETUP message is received from the originating subscriber terminal (S1), and checks the error of the message (S2).

If there is an error, the call is released (S3). If there is no error, the ALS call / connection control processor (CCCP) issues a call / connection setup request (SETUP) message to the calling party (SET) signal information to the called subscriber subsystem (ALS) call / connection control processor (CCCP) (S5) after performing call / connection setting function (4).

And processing the call / connection setup request (SETUP) signal information by an incoming subscriber subsystem (ALS) call / connection control processor (CCCP) (S7) the call / connection setup function (SETUP) signal information to the calling subscriber subsystem (ALS) call / connection control processor (S7) CCCP).

Accordingly, the originating subscriber side receives information on the optimal switch link selection and a response to the call connection setup request (S8) (S8).

Thereafter, a function of releasing the reserved switch link is performed (S9), and a CALL PROCEEDING signal message is transmitted to the calling subscriber terminal (S10).

In the called subscriber subsystem (ALS) call / connection control processor (CCCP), a call / connection setup request (SETUP) message requesting call / connection to the called subscriber is transmitted to the called subscriber (S11), and awaits the response message.

Then, a signaling message is received from the called subscriber terminal by the called subscriber subsystem (ALS) call / connection control processor (CCCP) (S12), and the message error is analyzed and the processing thereof is performed (S13).

That is, if there is an error in the received message, the call is released by error processing, and if there is no error, it is checked whether it is the first response message to the SETUP message (S14).

If it is the first response message by this check (S14), the connection setting function by the routing tag is performed (S15).

If the received message is not the first response message, the type of the received message is checked (S16).

If the first message is an ALERTING message by the message type check (S16), the message is transmitted to the subscriber subsystem (ALS) call / connection control processor (CCCP) that originated the ALERTING message (S17) , And waits for the next message. If the first message is a CONNECT message by the message type check S16, the connection signal information is transmitted to the calling subscriber subsystem (ALS) call / connection control processor (CCCP) (S18) , A CONNECT ACKNOWLEDGE message is transmitted to the called subscriber terminal (S19), and the called party maintains the busy state by completing the call / connection setup.

In step S21, when the ALS message is received from the ALS / CCCP in step S20, the calling subscriber transmits an ALERTING message to the calling subscriber in step S21.

When the transmitted CONNECT message is received (S22), the connection matching function related to the routing tag is performed by the subscriber matching module 140 (S23), the connection message is transmitted to the calling subscriber (S24) And maintains the busy state by receiving a CONNECT ACKNOWLEDGE message (S25).

FIG. 4 is a flow chart of origination call / connection setup for call / connection setup request (SETUP) message in FIG.

First, the source terminal requests allocation of a virtual path identifier (VPI) / virtual channel identifier (VCI) to the subscriber link resource management block (ULRHF) 135a (S31), and sends the result to the subscriber link resource management block 135a (S32). If the result is abnormal, it is determined whether the result is normal (S33). If the result is abnormal, the call / connection of the subscriber is released (S34).

If it is determined in step S33 that the reception result is normal, bandwidth allocation is requested again to the subscriber link resource management block 135a (S35), and the result obtained from the subscriber link resource management block 135a (S36) It is determined again whether it is normal (S37).

If the result is abnormal by this judgment (S37), the call / connection is released (S38). If the result is normal (S37), information on the actual position of the subscriber subsystem (ALS) 100 and the called subscriber is requested to the number translation block (NTCF) 341 (S39) (S40).

If it is determined that the received number translation result is normal (S41), if it is abnormal, the call / connection is released (S42), and if it is normal, the switch link resource management block (SLRHF, 135b) ).

The request is received from the switch link resource management block according to the request (S43) (S44), and it is determined whether the result is normal (S45).

If the result of the determination in step S45 is abnormal, the call / connection is released (S46). If the result is normal, the calling / connection setting function by the SETUP message is terminated (S47).

FIG. 5 is a flow diagram of an incoming call / connection setup for a call / connection setup request (SETUP) message in FIG. The called terminal requests the switch link resource management block 135b for optimal switch link selection and bandwidth allocation in step S50 and receives the switch link selection result in step S51, And transmits the result to the subscriber subsystem (ALS) 100 (S52).

In other words, since it includes the nature of the response to the call / connection setup request (SETUP) signal requested by the calling side, it transmits regardless of the result.

Then, it is determined whether the received optimal switch link selection result is normal (S53). If the result is abnormal, the subscriber call / connection setup process is canceled (S54).

However, if it is normal, the link status of the called subscriber is requested to the subscriber link state management block 136 (S55), and the link state of the called subscriber is received from the subscriber link state management block (S56).

If it is abnormal, resets the subscriber call / connection setup process in step S58. If the subscriber link resource management block 135a is normal, the virtual path identifier VPI / A virtual channel identifier (VCI) allocation is requested (S59).

The requested result is received from the subscriber link resource management block 135a (S60), and it is determined whether the result is normal (S61).

If the result is abnormal at step S61, the call / connection setup is canceled (S62). If the result is normal, the bandwidth allocation is requested again to the subscriber link resource management block 135a (S63) (S64).

If it is determined that the received band allocation result is normal (S65), if it is abnormal, the call / connection is released (S66). If the result is normal, the called party ends the process of the SETUP message (S67).

FIG. 6 is a flowchart of a reservation switch link band cancellation process in FIG. 3; FIG.

(S70). If the result is abnormal, the call / connection is released (S71). If the result is abnormal, the switch link selected is determined to be normal And requests the switch link resource management block (SLRHF, 135b) to release the reserved switch link (S72). A result according to this request is received (S73).

7 is a flowchart of a connection establishment method using a routing tag in FIG. In step S81, the switch routing information of the cell is transmitted to the subscriber matching module (SIM) 110 so that the user information can be transmitted (S80).

(S82). If the received result is abnormal, the subscriber call / connection is released (S83). If the result is normal, the process ends.

As described above, the present invention can provide a call / connection setup for point-to-point communication such as telephone, fax, and data communication in a broadband end-to-end communication network (B-ISDN) service.

In addition, it can be applied to a service provided by an ATM network such as a recording announcement broadcast in the future.

Claims (7)

An asynchronous delivery comprising subscriber subsystems (ALS) each connected to an external interface and having a subscriber / trunk line matching module, and a central subsystem (ACS) interconnecting the subscriber subsystems to establish a subscriber call / connection A subscriber subsystem comprising: a call control unit for managing a call state and a call reference number; a connection control unit for communicating with the call control unit to manage resources and control connection with respect to resources; And a subscriber link state management unit for storing a subscriber link state by communicating with the asynchronous delivery mode, wherein the asynchronous delivery mode comprises a call / Subscriber call / connection establishment device at the exchange. 2. The apparatus of claim 1, wherein the call / connection processing means communicates with the subscriber matching module to release the switch routing information from the subscriber matching module. The apparatus of claim 1, wherein the connection controller comprises a subscriber link resource manager for managing subscriber link resources and a switch link resource manager for managing switch link resources. . 2. The asynchronous transfer mode switch of claim 1, wherein the call control unit communicates with a number translation block in the central subsystem (ACS) to identify the actual location of the called subscriber. . (ALS), each of which is connected to an external interface and has a subscriber / trunk line matching module, and a central subsystem (ACS) interconnecting the subscriber subsystems, A subscriber call / connection is established with a call / connection control processor, which includes a resource management block, a switch link resource management block, and a subscriber link state management block and communicates with a number translation block in the central subsystem (ACS) A subscriber call / connection control method in an asynchronous transfer mode switch, comprising: receiving a call / connection setup request message from a subscriber terminal, releasing a call if there is an error; (SETUP) message to the called party, and then sends the call / connection setup request A first step of transmitting a signal for a SETUP message and a call setup / call setup function by a called party to a call / connection setup request (SETUP) signal in the first process; , When information indicating that the optimum switch link has been selected is transmitted to the calling side, the information on the optimal switch link selection is received from the originating subscriber side and the function of releasing the reserved switch link is performed, A second step of transmitting a SETUP message related to connection setup to a called subscriber; receiving a signaling message transmitted in the second step, releasing a call by error processing when an error occurs; If there is no error, it is checked whether the first message is a call / connection setup request (SETUP) message. If the first message is a connection setup function by the routing tag, If it is not a message, it is checked whether it is an alerting message or a connect message. If it is an alerting message, an alerting message is sent to a calling party. If it is a connecting message, a ken message is sent to a calling party, If the transmitted message is an Altering message, the calling party transmits an Altering message to the calling subscriber. If the message is a Connected message, the calling party performs a connection setting function related to the routing tag to the subscriber matching module And a fourth step of transmitting the connect message to the calling subscriber, and then receiving the connect response message and completing the call / connection setup, in the asynchronous transfer mode switch. 6. The method of claim 5, wherein the originating call / connection setup request (SETUP) message processing of the first process allocates a virtual path identifier (VPI) / virtual channel identifier (VCI) in cooperation with the subscriber link resource management block A step 1-2 of allocating a subscriber link band if the allocation result in the step 1-1 is normal, a step 1-2 of allocating a subscriber link band if the allocation result in the step 1-1 is normal, A third step of translating to find the actual location of the called subscriber in cooperation with the switch link control block, if the number translation result in the step 1-3 is normal, The method of claim 1, further comprising the steps of: 6. The method according to claim 5, wherein the called party call / connection setup request (SETUP) signal processing of the upper stage second process comprises: a second step of selecting an optimal switch link in cooperation with the switch link control block; A step 2-2 of informing a result of the first step to the originating call / connection control block, a step 2-3 of checking the subscriber link status in cooperation with the called subscriber link state management block, A second step of allocating a virtual path identifier (VPI) / a virtual channel identifier (VCI) in cooperation with a management block, a step 2-5 of allocating a subscriber link band in cooperation with the subscriber link resource management block, And (2-6) receiving the optimal switch link selection result at the calling side and releasing the reserved switch link band excluding the selected switch link in association with the switch link control block Subscribers call / connection setting method in the synchronous transfer mode switching.