KR0169251B1 - Call discarding method generated by restarting the interface module controller in atm virtual channel exchanger - Google Patents

Abstract

The present invention relates to a call release method generated by an IMC in an ATM VC exchange, and in particular, by providing the function of release a call generated by an IMC restart using the IMCF and the UPCF in the ATM VC exchange, the efficiency of resource management can be improved. In addition, a call release method generated by an IMC in an ATM VC exchange, which can increase the success rate of call connection and improve the performance and reliability of the exchange, is disclosed.

Description

Call Release Method Caused by Interface Module Controller Restart in Asynchronous Transfer Mode Virtual Channel Switch

1 is a structural diagram of an asynchronous transmission mode virtual channel exchange system.

2 is a block diagram illustrating a message flow between related blocks that perform a call release function caused by a restart of an interface module controller implemented on an asynchronous transmission mode virtual channel switch.

3A through 3C are flowcharts for explaining a call release method generated by an interface module controller restart in an asynchronous transmission mode virtual channel switch.

* Explanation of symbols for main parts of the drawings

101: ATM Local Switching Subsystem (ALS)

102: ATM Central Switching Subsystem (ACS)

103: Call and Connection Control Processor (CCCP)

104: Operation and Maintenance Processor (OMP)

105: Interface Module (IM)

106: Interface Module Control Function Block (IMCF)

107: User Protocol Interface Function (UPIF)

108: User Protocol Control Function (UPCF)

109: Switch Link Resource Handling Function Block (SLRHF)

110: user interface interface link resource handling function block (ULIHH)

111: Number Translations ALS Function Block (NTLF)

112: Number Translations ACS Function (NTCF)

The present invention relates to a call release method generated by an Interface Module Controller (IMC) in an Asynchronous Transfer Mode Virtual Channel (AMT VC) exchange, in particular ATM VC. A method for releasing a call generated by IMC restart using an interface module control function block (hereinafter referred to as IMCF) and a user protocol control function block (hereinafter referred to as UPCF) in an exchange. will be.

In general, an ATM VC switch is decomposed into cells when a call establishment signaling message is transmitted from a user terminal and enters the IMC of the exchange through a virtual path and a virtual channel for signaling in a link. Since the input cells are signal cells, the IMC attaches internal switch routing information to be sent to the call processing processor. When all these cells arrive at the call processing processor, they are assembled into a call setup signal message and sent to the signal message receiving process. This process converts the call setup signal message into a call setup signal, an internal call processing signal, to generate a call processing process. Send to process The main process creates an outgoing and incoming call processing process, and the outgoing and incoming call processing process sends the resources associated with the call: data input virtual path and virtual channel, data output virtual path and virtual channel and switch routing information to the IMC. The IMC then stores this information in the cell header translation table and the internal switch routing table, respectively. When call connection is completed and the call setup completion signal message is transmitted to the user terminal by the determination of the virtual path and the virtual channel to transmit the data and the switch routing information, the user terminal transmits the data to the data input virtual path and the virtual channel determined by the exchange. Will be sent. When these data are decomposed into cells and come to the IMC, the input virtual path and the virtual channel of the cell header are changed to the output virtual path and the virtual channel, and internal switch routing information is attached. These data cells are then transmitted to the destination terminal through the output virtual path and virtual channel of the corresponding IMC via a switch.

The ATM VC exchange, which is set up by conventional signaling, transmits a virtual signal and a virtual channel for a signaling signal of a link from a user terminal. When the user terminal transmits all desired data to the connected virtual path and virtual channel, and the data transmission is over and the call release signal message transmitted from the user terminal to complete the call use is received through the virtual path and the virtual channel for the signaling message. The function of releasing virtual path and virtual channel which transmitted data is not implemented normally. A link, which is a medium for transmitting signaling messages and data transmitted by a user terminal, is connected to an IMC of an ATM VC switch, and signaling messages and data transmitted through corresponding virtual paths and virtual channels in the link are ATM transmission units. The cell is divided into cells and arrives at IMC. This IMC is used to search the cell header translation table, which is information for transmitting data to the virtual path and virtual channel determined during the connection of the call, and to convert it to the output virtual path and virtual channel corresponding to the cell's input virtual path and virtual channel. Information. In addition, the switch routing table has information about switch ports to pass through to transmit data. The switch routing table is used to search input virtual paths and virtual channels of the input cells in the switch routing table and attach the corresponding switch routing information to the cells. Information. All of this information is lost when the IMC restarts, and it can no longer process the input cell, resulting in a situation where data cannot be transmitted. However, in the related art, there is no method for immediate call release in such a situation, and the user terminal continuously transmits data without knowing such a state. Therefore, although the call release signal message from the user terminal is not released until the call processing processor receives the call processing processor through the virtual path and the virtual channel for the signaling message, the data is not performed and the charging is continuously made. In exchange, data exchange between virtual path and virtual channel managed by IMC and virtual path and virtual channel managed by call processing process within call processing processor is performed. The virtual path and the virtual channel to which the data is to be transferred are allocated, but the call processing process is in use for the same virtual path and the virtual channel and cannot be used for setting up another call. If this condition continues, the user continues to request a call, or the exchange system can no longer connect the call because there are no more resources to connect the call. Eventually, the performance and reliability of the exchange system will be degraded.

Therefore, the present invention provides a function to release a call for a connected call in the IMC when the IMC is restarted in the exchange, so that the resources occupied by the call can be recovered and used for another call connection, thereby efficiently managing resources. Through resource recovery, it is possible to improve the performance of the exchange system by increasing the success rate of the call connection by keeping the call connection success, and to keep the virtual path and virtual channel information and the switch routing information managed by the IMC call and the call processing process always matched. It is an object of the present invention to provide a call release method generated by restarting an interface module controller in an asynchronous transmission mode channel exchange that can improve the reliability of an exchange system.

In the asynchronous transmission mode virtual channel exchange according to the present invention for achieving the above object, the call release method generated by the restart of the interface module controller is the user interface control function main process of the interface module controller restart signal generated from the interface module controller. A first step of transmitting, and a second step of transmitting a call processing process stop signal to a user protocol control function according to the interface module controller restart signal transmitted to the user protocol control function main process; A third step of transmitting a call release request signal to the user protocol interface function block after transmitting the call release signal to the user protocol control function process of the power according to the transmitted call processing process stop signal; A fourth step of transmitting the interface module controller disconnection signal to the interface module controller according to the call release signal sent to the user protocol control function process; and the interface module controller according to the interface module controller disconnection signal sent to the interface module controller. Transmitting a call release request signal to the user protocol interface function block according to a fifth step of transmitting a disconnection completion signal to the user protocol control function process, and according to the interface module controller disconnection completion signal sent to the user protocol control function process. And a seventh step of transmitting a call release message to the user terminal according to the call release request signal transmitted to the user protocol interface function block.

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

1 is a structural diagram of an ATM VC exchange system to which the present invention is applied. This ATM VC switch consists of an ATM Local Switching Subsystem (ALS) 101 and an ATM Central Switching Subsystem (ACS) 102. The ALS 101 is a call and connection control processor (CCP) 103 that performs a call and connection function, and an interface module (referred to as IM) 105 that performs a subscriber matching function. ACS 102 is composed of an Operation and Maintenance Processor (OMP) 104 that performs operations, maintenance, billing, statistics, and operator matching functions.

Looking at the function of each block required to perform the call processing User Protocol Interface Function Block (User Protocol Interface Function (UPIF)) 107 is a matching function of the user terminal and the signaling protocol and the received signal message to the call processing internal signal Converts the signal to a user protocol control function block (UPCF) 108, and the UPCF 108 receives a signal from the UPIF 107 to perform a call and connection function. The call processing block establishes and releases calls and connections, and performs call release when an IMC restart occurs. The UNI Network Resource Link Function (UNI Link Resource Handling Function) (ULRHF) 110 is a block that manages a User Network Interface (hereinafter referred to as UNI) link resource between a user terminal and a switch, and is a switch. The Switch Link Resource Handling Function (SLRHF) 109 is a block for managing switch link resources between subsystems in an ATM exchange. The Number Translations ALS Function (NTLF) (111) and the Number Translations ACS Function (NTCF) 112 perform the function of number translation and the interface module control function (Interface). Module Control Function (also referred to as IMCF) 106 includes a function of matching subscriber links, converting input virtual paths and virtual channels of input cell headers into output virtual paths and virtual channels, and attaching switch routing information. Perform.

2 is a block diagram showing the configuration of the related blocks and the flow of messages to perform the call release function generated by the IMC restart implemented on the ATM VC switch, the ALS 201 configuration of the same source and destination. When the IMC restarts, the IMC survives and transmits the IMC restart signal to the User Protocol Control Function main process (hereinafter referred to as UPCFmain) 204, which is the main process for generating the call processing process. When the UPCFmain 204 receives the IMC restart signal, the UPCFmain 204 searches for a call set up by the IMC that has transmitted the IMC restart signal in the Call Reference Table (CRT). And all incoming call processing processes. Thus, the call processing process stop signal is sent to the found call processing process, User Protocol Control Function child process (UPCFchild) 205, and then the contents are deleted from the originating and incoming call reference value table. Let's do it. When the UPCFchild 205 receives the call processing interrupt signal, the UPCFchild 205 calls ULRHF 208 for the input virtual path and the virtual channel carrying the UNI link resource occupied by the UPCFchild 205, the data, and the output virtual path and the virtual channel. Releases, releases the switch link resource occupied for data transfer by calling SLRHF 207, releases the UNI bandwidth resource by calling ULRHF 208, and calls the UPCFchild 205 of the other party to which the call is connected. Send the release signal. In addition, the call release request signal is transmitted to the UPIF 203 to make a call release request to the user terminal, and the UPIF 203 receiving the call release request transmits a call release message to the user terminal 202. On the other hand, when the UPCFchild in the station receives the call release signal, it releases the input virtual path and virtual channel and output virtual path and virtual channel occupied by the UPCFchild, releases the switch link resource, releases the UNI bandwidth resource, and informs the IMC. Delete the virtual path and virtual channel occupied by UPCFchild from the cell header translation table, delete the relevant switch routing information from the switch routing table, and release the call with UPIF to release the call to the user terminal connected to the call. Send the request signal. The UPIF then sends a call release message to the user terminal.

Figure 3 is a general flow diagram of the call release function caused by IMC restart at the ATM VC exchange. When the IMC sends the IMC restart signal to UPCFmain (1), the UPCFmain receives the IMC restart signal (2) and searches for all call processing processes UPCFchild that have been set to the IMC that sent the IMC restart signal in the originating call reference value management table. (3) Send a call processing process stop signal to the UPCFchild (4). Then, the contents of the corresponding UPCFchild are deleted from the outgoing call reference value management table (5). Next, all of the call processing processes UPCFchild, in which the call is set, are transmitted to the IMC that has transmitted the IMC restart signal in the incoming call reference value management table (6), and the call processing process abort signal is transmitted to the corresponding UPCFchild (7). The contents of the corresponding UPCFchild are deleted from the called call reference value management table (8). When the UPCFchild receives a call processing interrupt signal (9), it releases the UNI link resources occupied by the UPCFchild, i.e., the input virtual path and virtual channel and output virtual path and virtual channel carrying data (10), Releases the occupied switch link resource (11), releases the UNI bandwidth resource (12), and transmits the call release signal to the UPCFchild of the other party to which the call is connected (13). In addition, if a call release request signal is transmitted to UPIF in order to request call release from the user terminal (14), the UPIF 15 receiving the call release request transmits a call release message to the user terminal (16). On the other hand, when a UPCFchild in a powerhouse receives a call release signal (17), it releases the virtual path and virtual channel occupied by the UPCFchild (18), releases the switch link resource occupied for data transmission (19), and After releasing the bandwidth resource (20) and sending the IMC disconnect request signal containing the virtual path and virtual channel information for data transmission occupied by the UPCFchild (21), the IMC receives the IMC disconnect request signal ( 22) With the virtual path and the virtual channel in the signal information received in the cell header translation table, it searches and deletes the corresponding contents (23), and the switch routing information related to the virtual path and the virtual channel is also deleted from the switch routing table ( 24). It then sends an IMC disconnect complete signal to the UPCFchild (25). When the UPCFchild receives the IMC disconnection completion signal (26), it transmits a call release request signal to the UPIF to release the call to the user terminal to which the call is connected (27). When the UPIF receives the call release request signal (28), it implements a call release message to the user terminal (29).

As described above, according to the present invention, resources associated with call setup, which have been occupied because IMC is restarted but not released, can be recovered by the call release function by IMC restart, thereby improving resource management efficiency. In addition, the performance of the exchange can be improved by increasing the success rate of the call connection by allowing the resources recovered by the call release by the IMC restart to be used in setting up another call. In addition, the virtual path and virtual channel information managed by the IMC, the switch routing information, the virtual path and virtual channel information managed by the call processing process, and the switch routing information are kept consistent so that the reliability of the exchange system can be improved. There is.

Claims (6)

A first step of transmitting the interface module controller restart signal generated from the interface module controller to the user protocol control function main process, and the call processing process interruption signal according to the interface module controller restart signal sent to the user protocol control function main process. Transmitting a call release signal to a user protocol control function process of a power station according to a second step of transmitting to a protocol control function process and a call processing process stop signal sent to the user protocol child process; A third step of transmitting a call release request signal and transmitting an interface module controller disconnection signal to the interface module controller according to the call release signal transmitted to the user protocol control operator process of the power station; And a fifth step of transmitting an interface module controller disconnection completion signal to the user protocol control operator process according to the interface module controller disconnection signal transmitted to the interface module controller. A sixth step of transmitting a call release request signal to the user protocol interface function block according to the transmitted interface module controller disconnection completion signal; and receiving a call release message according to the call release request signal transmitted to the user protocol interface function block. And a seventh step of transmitting to the call release method generated by restarting the interface module controller in the asynchronous transmission mode virtual channel switch. 2. The method of claim 1, wherein the second step comprises: searching in an outgoing call reference value management table according to an interface module controller restart signal and transmitting a call processing process interruption signal to a user protocol control operator process; Deleting the contents of the user protocol control function process from the call origin reference value management table, transmitting the call processing process stop signal to the user protocol control function process by searching in the incoming call reference value management table; And deleting the contents of the user protocol control function process that has transmitted the data from the incoming call reference value management table. The method of claim 1, wherein the third step comprises the steps of releasing resources associated with the call that was occupied by the call processing process stop signal received by the user protocol control function process, and the user protocol control releasing the resources. Transmitting, by a user process, a call release signal to a user protocol control function process of a power station; and transmitting a call release request signal to a user protocol interface function block by the user protocol control function process that has transmitted the call release signal. And generating a call release message from the user protocol interface function block which has received the call release request signal and transmitting the call release message to the user terminal by restarting the interface module controller in the asynchronous transmission mode virtual channel switch. How to disable bottled call. 2. The method of claim 1, wherein the fourth step comprises the steps of releasing resources associated with the call that was occupied by the call release signal received by the user protocol control function process of the power station; And transmitting the interface module controller disconnect request signal to the interface module controller in a process. The method of claim 1, wherein the fifth step searches for the virtual path and the virtual channel occupied by the user protocol controller in the cell header translation table according to the interface module controller disconnect request signal received from the interface module controller. Deleting the corresponding contents, deleting the corresponding contents of the user protocol control function process from the cell header translation table, and then deleting the switch routing information from the switch routing table, and deleting the switching routing information from the user protocol. And transmitting an interface module controller disconnection signal to a control function process. 5. The method according to claim 3 or 4, wherein the resources associated with the call are user network interface link resources for input data and virtual channels for delivering data, output network paths and virtual channels, switch link resources for data transmission, and a user. A call release method generated by restarting an interface module controller in an asynchronous transmission mode virtual channel switch, characterized by consisting of network interface bandwidth resources.