KR100204058B1 - Link release processing method of reserved mode virtual path and virtual channel elapsing the service time in atm switching system - Google Patents

Abstract

The present invention relates to a method for processing disconnection between a reservation mode virtual path (VP) and a virtual channel (VC) upon completion of a service time in an asynchronous delivery mode (ATM) switching system. When receiving the disconnect request of the path and the virtual channel, delete the connection-related data to be released on the time table, and request the disconnection processing to the called party, and when receiving the normal processing result, distinguishes between the one-way link and the two-way link on the calling database. Releases the occupied resources of the switch link, deletes the established connection identifier (VPI / VCI), separates the unidirectional link and the bidirectional link, and releases the connection-related data of the subscriber / relay line interface module (SIM / TIM). A first step (100 to 125) of notifying the completion of disconnection; And upon disconnection of the reservation mode virtual path and the virtual channel from the originating party, the one-way link and the two-way link are distinguished, and the connection-related data in the database is deleted, and the set connection identifier (VPI / VCI) is deleted. And a second step (200 to 214) for releasing the connection-related data of the subscriber / relay line interface module (SIM / TIM) by noting the two-way link and informing the calling party of the completion of the called party disconnection processing. By effectively using it, it is possible not only to accommodate more subscribers but also to provide improved services to subscribers.

Description

How to handle disconnection between reserved mode virtual path and virtual channel when service time is completed in asynchronous transfer mode (ATM) switching system

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

2 is a software functional block diagram of an ATM switching system to which the present invention is applied.

3 is a flowchart illustrating a process of an originating main module for disconnecting a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

4A and 4B are flowcharts of an origination processing process for disconnection of a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

5 is a flowchart illustrating a processing of a called main module for disconnecting a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

6 is a flowchart illustrating an incoming call processing process for disconnection between a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

* Explanation of symbols for main parts of the drawings

1: ATM Local Switching Subsystem (ALS)

2: ATM Central Exchange Subsystem (ACS)

3: connection switching network module (ASNM) 4: trunk line interface module (TIM)

5 Subscriber Interface Module (SIM) 6 Access Switching Control Module (ASCM)

7: Internal Connection Switching Network Module (ISNM) 8: Operational Maintenance Control Module (OMCM)

The present invention relates to a method for processing disconnection between a reservation mode virtual path (VP) and a virtual channel (VC) when a service time is completed in an asynchronous delivery mode (ATM) exchange system.

In many countries around the world, Asynchronous Transfer Mode (ATM) switching systems are rushing to develop broadband services early and to provide service to real users.

Currently, the United Kingdom and Japan provide virtual path (VP) / virtual channel (VC) connection services in ATM switching systems, but the control method in these systems is fixed to subscribers at the time of system installation. Since the service is provided by storing the VP / VC connection information and the routing information in the control memory of the system, the flexible control is difficult.

The small ATM switching system currently being developed allows the operator to request a dedicated line setting at any time by specifying the service time while the system is in use.However, it is controlled only by bidirectional symmetry, thus occupying in both directions even if one-way or two-way asymmetric service is required. As the utilization of the link resources is low, the subscriber capacity of the system is significantly lowered. In the one-way direction, the control for the reverse direction must be performed. Therefore, unnecessary time is required. Also, if the operator requests the leased line service reservation, the designated service starts. The system itself establishes a connection at a time to provide a service, and the function of disconnecting at a specified service end time and stopping a service is not provided in units of virtual channels.

Therefore, the present invention devised to solve the problems of the prior art as described above is a point-to-point dedicated line registered in the reservation mode by the operator is set by the system itself at the service start time to perform the service, when the connection registration is requested by the operator In asynchronous transfer mode (ATM) switching system, which receives the timeout signal from the operating system of the system at one service end time and releases the connection by separating one-way and two-way control, the reservation mode virtual path and Its purpose is to provide a disconnection processing method for a virtual channel.

In order to achieve the above object, the present invention provides a reservation mode virtual path and a virtual channel in a method for processing disconnection between a reservation mode virtual path (VP) and a virtual channel (VC) upon completion of a service time applied to an asynchronous delivery mode switching system. Upon receiving a disconnection request from the receiver, delete the connection-related data to be released on the timetable, read the connection-related data stored in the database, calculate user cell monitoring information, and request a disconnection processing from the called party. When receiving the processing result, the one-way link and the two-way link are separated from the source database to release the occupied resources of the transmit / receive switch link, request the deletion of the connection identifier (VPI / VCI), and then delete the one-way link and the two-way link. By classifying the connection to the subscriber / relay line interface module, When the enemy off is carried out in a first step to notify the operator to disconnect complete; And upon receiving the disconnection request between the reservation mode virtual path and the virtual channel from the originator, calculate the user cell monitoring information, distinguish the one-way link and the two-way link, delete the connection-related data in the database, and connect the connection identifier (VPI / VCI). After the request is made to delete, the unidirectional link and the bidirectional link are separated, and the subscriber / relay interface module (SIM / TIM) is requested to release the connection-related data. And a second step of notifying completion.

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

1 is a block diagram of an ATM switching system to which the present invention is applied, in which, '1' is an ATM local switching subsystem (ALS), '2' is an ATM Chinese exchange subsystem (ACS), and '3' is a connection diagram. Switching network module (ASNM), '4' is trunk line interface module (TIM), '5' is subscriber interface module (SIM), '6' is connection switching control module (ASCM), '7' is internally connected switching network module (ISNM) and '8' represent an Operational Maintenance Control Module (OMCM), respectively.

ATM switching systems are distributed in units of independent ATM switching subsystems (ALS) and interconnected by ATM Central Switching Subsystem (ACS). do.

Each ALS 1 includes an Access Switching Networking Module (ASNM) that performs link matching and ATM cell switching, and a trunk line interface module (TIM: Trunk), which performs cell transmission and reception between a network and a node. Interface Module (4), Subscriber Interface Module (SIM) that performs cell transmission and reception between the subscriber and the network, and control and maintenance functions related to routing and connection processing in the ALS (1). It consists of an Access Switching Control Module (ASCM), which is a call control module that manages the control.

The SIM (5) is equipped with a BSIH (9), which is a high speed (155 Mbps) data transfer board, an MSIH (10), which is a medium speed (44 Mbps) data transfer board, and an LSIH (11), a low speed (2 Mbps) data transfer board, and a TIM (4). HTIH 13, which is a 622Mbps data transfer board, and BTIH 12, which is a 155Mbps data transfer board, are mounted on the λMbps.

Each ACS (2) is an Interconnection Switching Networking Module (ISNM) that performs internal connectivity between ASNMs (3) and maintenance functions within the ACS (2) and system-wide maintenance management ( It consists of Operation Maintenance Control Module (OMCM) (8) which performs MA (Maintenance Administration) function.

2 is a software functional block diagram of an ATM switching system applied to the present invention.

The Execution Control Software Bolck (ECF) block 21 in the OMCM (8) that performs the operator interface analyzes the instructions entered by the operator and sends the corresponding processor to an inter-process communication (IPC) message corresponding to the input instructions. A software block that processes operator input commands by sending.

The OCF block 22 is a software block that outputs an output message and a system output message for a command input by an operator to an operator terminal.

A semi-permanent piont to point virtual connection control software block (SPVCF) 23 in the ASCM 6 that performs point-to-point leased line control is a call connection control processor (CCCP) in each ALS (1). Located in, create child processes for each of the messages received through the human machine interface (HMI), and each child process controls the connection to perform the function for that message. Depending on the scenario, this is a software block that handles the setting and undoing of point-to-point dedicated lines.

The ULRHF block (UNI / NNI Link Resource Handing Software Block) 24 is located in the CCCP of each ALS 1, and is a software block that manages user network interface (UNI) / network node interface (NNI) links and system internal links. to be.

Subscriber Interface Module Control Software Block (SIMCF) block 25 in the SIM 5 that performs subscriber matching function is implemented as firmware of the subscriber link matching module, and receives information for subscriber routing from the SPVCF block 23. It is a software block that manages and attaches routing information for finding a routing path of a switch to a subscriber information cell so as to enable information transmission between an originating subscriber and a destination subscriber.

A TIMCF block (Trunk Interface Module Control Software Block) 26 in the TIM 4 performing the relay line matching function is mounted as firmware of the trunk line link matching module and attaches information for routing relay line data from the SPVCF block 23. It is a software block that performs a function.

The MF block 27 in the ASNM 6 is a software block that informs the SPVCF block 23 whether to use the UNI / NNI link corresponding to the dedicated line to be set.

3 is a flowchart illustrating a process of an originating main module for disconnecting a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

When the reservation mode virtual path / channel connection service that the operator has already registered from the operating system (OS) expires and receives a connection release request (100), the connection related data to be released on the time table in the SPVCF block 23 is deleted. After step 101, it is confirmed whether or not the deletion is normally performed (102).

If the deletion on the time table fails, the processing of the originating main module for releasing the reservation mode virtual path / channel is terminated. If the deletion on the time table succeeds, the processing to release the reservation mode virtual path / channel connection is performed. Create an outgoing process for the 103.

4A and 4B illustrate a processing flow diagram of an origination processing process for disconnecting a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

First, in order to release the reserved mode virtual path / channel, connection-related data stored in a database is stored in a register (104), and it is checked whether data is already registered (105).

As a result of the check, an abnormal cause indicating 'database processing failure' is stored if it is not already registered data (106), and after notifying the failure of disconnection of the reserved mode dedicated line (107), it is checked whether the incoming processing is normally completed ( 108).

If the incoming processing is normally completed, the matching / failure failure message of the originating / receiving side data is output (109) and terminated. If the incoming processing is not completed normally, the processing is terminated immediately.

If the check result is already registered data (105) by calculating the number of cells per second and cell delay variation for the user cell monitoring (110) to release the bandwidth occupied in the interface module (UNI / NNI / IMI) link, the reservation mode virtual To transmit a call processing request message including information necessary for disconnection of the path / channel to the main process of the SPVCF block 23 in the called CCCP (111), and to receive the data release processing result of the called party connection from the called function. The standby timer is activated 112 to enter the standby state 113.

Receiving an incoming call waiting timer from the called party in the incoming call waiting state (113) (114), or receiving an abnormal incoming call processing result (115, 116) and storing an abnormal cause indicating 'unsuccessful connection disconnection'. If the procedure 106 is performed and normal reception processing result is received (115, 116), the connection related data is deleted from the calling party database, and then the ULRHF block 24 is requested to release the connection related data ( 117), it is checked whether the release result is normal (118).

Looking at the above connection-related data deletion process in more detail, since the connection in the same ALS does not use a switch link, the internal switch link is released only when the connection is in a different ALS. First, whether the switch link is unidirectional or not. In this case, the ULRHF block is required to release resources occupied by the transmit switch link (ALS to ACS) only in the unidirectional mode and the transmit switch link and the receive switch link (ACS to ALS) in the bidirectional direction.

In case of unidirectional communication, resources occupied by only the receiving UMI / NNI link (SIM / TIM at the subscriber / switch node) and resources in the case of bidirectional use the receiving link and the receiving UNI / NNI link (subscriber / switch node at SIM / TIM). After all are released, the deletion of the VPI / VCI number set in the ULRHF block is requested.

If the release result is abnormal, the process of storing an abnormal cause indicating 'data release failure' is performed (106). If the release result is normal, a message requesting release of data related to connection is sent to the subscriber / relay line interface module ( 119, registers the wait timer (120), and enters the release result wait state (121).

In this case, the release request requires that the connection information be deleted from the reception table in the SIM or the TIM in one direction, and the connection related information is deleted from both the transmission / reception table in the bidirectional direction.

Receiving a wait timer in the waiting state of the release result (122), or receiving an abnormal release result (123,124), the process of storing the abnormal cause indicating the 'data deletion processing failure associated with the subscriber / trunk line interface module connection' (106) Perform On the other hand, upon receiving the normal release processing result message from the subscriber / relay line interfering module (123, 124), after outputting a status change message notifying the operator of the completion of the reservation mode virtual path / channel disconnection (125), the calling process terminates. This completes the processing for the calling party disconnection processing.

5 is a flowchart illustrating a process of a main process in a called party SPVCF block for disconnection of a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

In step 201, an incoming process (Child) process for reservation mode virtual path / channel disconnection processing is generated from the originating SPVCF block.

6 is a flowchart illustrating an incoming call processing process for disconnecting a reservation mode virtual path and a virtual channel in an ATM switching system according to the present invention.

The connection release request information received from the calling party SPVCF block checks whether the release requested connection is a connection already registered in the database (202, 203).

As a result of the check, if the connection is not already registered, an incoming call failure message is sent to the process waiting for completion of incoming call processing in the calling party's SPVCF block (211), and the current process is terminated.

If it is confirmed that the connection is already registered, the number of cells per second and the cell delay variation for the user cell monitoring are calculated using the band value (204), the connection related data in the database is deleted, and the connection request is released by the ULRHF block. After that (205), it is checked whether the release result is good (206).

Here, the release process in more detail, since the connection in the same ALS does not use a switch link, the internal switch link is released only in the case of connections in different ALS, first determine whether the switch link is unidirectional, In the unidirectional case, the ULRHF block is required to release resources occupied only by the receive switch link (ACS to ALS), and in the bidirectional case, by the release switch link (ACS to ALS).

In case of unidirectional, resources occupied only by the transmitting UNI / NNI link (subscriber / switched node in SIM / TIM), and in the bidirectional case, resources occupied by the transmitting switch link and receiving UNI / NNI link (SIM / TIM in subscriber / switched node). After releasing all of them, it is requested to delete the T VPI / VCI number set in the ULRHF block.

If an abnormal state occurs as a result of the release, an incoming call failure message is sent to the process waiting for completion of incoming call processing in the calling party's SPVCF block (211), and the current process is terminated.

If the release result is good, a connection release message is sent to the subscriber / relay line interface module (207), the wait timer is registered (208), and the release result wait state is entered (209).

In this case, the request for releasing connection-related data requires that the connection-related data be deleted from the transmission table in the unidirectional direction, and that the connection-related data is deleted from both the transmission / reception table in the bidirectional direction.

If the standby timer is received from the subscriber / relay line interface module (210) or the abnormal release result is received (212, 213) in the waiting for release result waiting state, a call processing failure message is sent to a process waiting for completion of incoming processing in the calling party SPVCF block. (211), when the current process is terminated and a normal release result is received (212, 213), a process waiting for completion of incoming processing in the calling party SPVCF block is notified to the called party connection related data release processing completion message (214). To exit.

In the present invention made as described above, the point-to-point dedicated line registered in the reservation mode by the operator is set by the system itself at the service start time to perform a service, and the operating system of the system at the service end time required by the operator at the time of connection registration. By receiving the timeout circuit and providing the function to separate the one-way and two-way control to release the connection to use more efficiently, not only can accommodate more subscribers but also provide better service to the subscribers. It can be effective.

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

Claims (8)

A method of processing disconnection between a reservation mode virtual path (VP) and a virtual channel (VC) upon completion of a service time applied to an asynchronous delivery mode switching system, wherein a request for disconnection between a reservation mode virtual path and a virtual channel is received on a time table. Delete the connection-related data to be released, read the connection-related data stored in the database, calculate user cell monitoring information, request the disconnection processing from the called party, and receive a normal result from the called party. Release the resources occupied by the transmit / receive switch link by classifying the link and the bidirectional link, requesting and deleting the connection identifier (VPI / VCI), and then deleting the unidirectional link and the bidirectional link to connect to the subscriber / relay interface module. If the release is performed normally by requesting release of data, A first step for notifying the release completion result; And upon receiving the request for disconnection between the reservation mode virtual path and the virtual channel from the originating party, the user cell monitoring information is calculated, and the connection-related data in the database is deleted by separating the one-way link and the two-way link, and the connection identifier (VPI / VCI). After the request is made to delete, the unidirectional link and the bidirectional link are distinguished and the subscriber / relay line interface module (SIM / TIM) is requested to release connection-related data. A disconnection processing method of a reservation mode virtual path and a virtual channel comprising a second step of notifying completion. The method of claim 1, wherein the first step receives a connection release request between the reservation mode virtual path and the virtual channel from the operating system, deletes connection related data to be released on a time table, and reads connection related data stored in a database. A third step of calculating the number of cells per second and cell delay variation for cell monitoring and then requesting disconnection processing to the called party; In the third step, a normal processing result is received from the called party, and in the case of a unidirectional link on the calling party database, the resource occupied by the transmitting switch link (ALS to ACS) is requested, and the receiving UNI / NNI link (subscriber) is requested. Releases all resources occupied by SIM / TIM) at the exchange node, requests release of resources occupied by the transmit switch link and the receive switch link (ACS to ALS) in the bidirectional link, and receives the link and transmit UNI Releasing the occupied resources of the transmit / receive switch link, releasing the occupied resources of the transmit / receive switch link after releasing all the resources occupied on the / NNI link (the subscriber / switch node in the SIM / TIM), requesting the deletion of the connection identifier, and confirming the release result. step; And if the release result is normal in the fourth step, in case of the unidirectional link, request the subscriber / relay interface module to release connection-related data from both the transmission and reception tables. And a fifth step, wherein the reservation mode virtual path and the virtual channel are disconnected. 3. The method of claim 2, wherein in the third step, upon receiving a request for disconnection of a reservation mode virtual path and a virtual channel from an operating system, the connection-related data to be released on the time table is deleted, and the connection-related data stored in a database. A sixth step of checking whether the data is already registered; If the data is not already registered in step 6, an abnormal cause indicating 'database processing failure' is stored, and a notification of failure in disconnection of the reserved mode leased line is made. A seventh step of outputting a failure failure message; If the data has already been registered in the sixth step, the number of cells per second and cell delay variation for the user cell monitoring are calculated, the disconnection processing is requested to the called party, and the called party processing result wait timer is driven to display the called party processing result. And a process for disconnecting a reservation mode virtual path and a virtual channel, comprising: an eighth step of waiting. 3. The method of claim 2, wherein the fourth step stores an abnormal cause of notifying the called party's disconnection failure when receiving an incoming call waiting timer from the called party in the waiting call waiting state or receiving an abnormal incoming call processing result. And notifying a disconnection failure of the reserved mode leased line, and if the incoming processing is normally completed, outputting a mismatch failure message of the called / called party data; And upon receipt of a normal processing result from the called party in the waiting state of incoming call, requesting release of resources occupied by the transmitting switch link (ALS to ACS) in the case of a unidirectional link on the calling database, and receiving a UNI / NNI link ( Releases all resources occupied by SIM / TIM at subscriber / switch node, requires release of resources occupied by transmit switch link and receive switch link (ACS to ALS) in case of bidirectional link, receive link and transmit UNI Release all resources occupied on the / NNI link (subscriber / switch node in SIM / TIM), release the occupied resources of the transmit / receive switch link, request the deletion of the connection identifier (VPI / VCI), and confirm the release result. And a seventh step of checking the reservation mode virtual path and the virtual channel disconnection processing method. The method of claim 2, wherein the fifth step requires the subscriber / relay line interface module (SIM / TIM) to release connection-related data from the reception table when the unidirectional link is in a normal release state. A sixth step of driving a timer for waiting for the connection release processing result of the subscriber / relay line interface module (SIM / TIM) to wait for the release result; And in step 6, when receiving the standby timer or receiving the abnormal release result, stores an abnormal cause indicating 'Failed to delete data related to connection of subscriber / relay line interface module connection' and notifies failure of disconnection of the reserved mode dedicated line. And a seventh step of notifying the completion of disconnection if the incoming / outgoing party's data is outputted when the incoming processing is normally completed, and notifying the operator of the completion of the disconnection. How to handle disconnection between virtual channel and virtual channel. The method of claim 1, wherein in the second step, upon receiving the request for disconnection of the reservation mode virtual path and the virtual channel from the calling party, it is determined whether the requested connection setting is already registered data in the database and using the band value. Calculate the number of cells per second and cell delay variation for user cell monitoring, and for the one-way link on the destination database, request the release of resources occupied on the receiving switch link (ACS to ALS), and the sending UNI / NNI link ( Release all resources occupied by the subscriber / edition node in the SIM / TIM, and in the case of a bidirectional link, request release of the resources occupied by the receiving switch link and the transmitting switch link (ALS to ACS). Release all resources occupied on the receiving UNI / NNI link (SIM / TIM at subscriber / switch node), release resources occupied on the transmit / receive switch link, and delete connection identifier (VPI / VCI). A third step of request and determine the release results; And if the release result is normal in the third step, in case of a unidirectional link, requesting release of connection-related data from a transmission table to a subscriber / relay line interface module, and in case of a bidirectional link, transmitting / receiving table to a subscriber / relay line interface module. And a fourth step of notifying the calling party of the completion of disconnection processing when the release is normally performed by requesting the release of connection-related data in all. . 7. The method of claim 6, wherein the third step comprises: a fifth step of checking whether the requested connection setting is already registered in the database when receiving a reservation mode virtual path and a connection release request of the virtual channel from the calling party; And if the data is not already registered in the fifth step, transmits an incoming call processing abnormal message to the calling party, and if the data is already registered, calculates the number of cells per second and cell delay variation for the user cell monitoring using the band value. In the case of a unidirectional link on the side database, the release of resources occupied on the receiving switch link (ACS to ALS) is required, and all resources occupied on the transmitting UNI / NNI link (SIM / TIM to subscriber / switched node) are all available. In case of bidirectional link, it releases resources occupied by the receiving switch link and the sending switch link (ALS to ACS), and the sending switch link and receiving UNI / NNI link (SIM / TIM at subscriber / switch node). And releasing the occupied resources of the transmit / receive switch link, requesting deletion of the connection identifier (VPI / VCI), and confirming the release result after releasing all occupied resources. Reservations mode disconnection processing method of the virtual path and virtual channel of. The method as claimed in claim 6, wherein the fourth step requires that the connection-related data is released from the transmission table to the subscriber / relay line interferry module in the case of a unidirectional link after the connection-related data is normally deleted on the called party's database. In the case of bidirectional link, the subscriber / relay line interface module is required to release connection-related data from both the transmit and receive tables, and then a timer for waiting for the disconnection processing result of the subscriber / relay line interface module is driven to wait for the release result. A fifth step; And a sixth step of receiving a waiting timer or receiving an abnormal release result in the fifth step and transmitting an incoming call processing abnormal message to the calling party, and notifying the calling party of completion of the called party disconnection processing upon receiving a normal release result. Disconnection processing method of the reservation mode virtual path and the virtual channel comprising a.