KR920001073B1 - A method for implementing sccp functions of ccitt no.7 common line signaling form - Google Patents

Abstract

The invention provides a function forming method for a signal connection control section which furnishes various services to the user part. The method includes the steps of: calling out a relevant feature after scanning into buffers (18,19 and 22) and after checking whether a primitive is inputted; implementing the called-out primitive module; and outputting the result of the implementation of the second step through output buffers (17,20 and 21) to a user part (UP), to a message transferring part (MTP) and to a timer control section (TMC).

Description

How to Implement Signal Connection Control Function of CCITT No.7 Common Line Signaling System

1 is a block diagram of a hardware system to which the present invention is applied.

2 is a software functional module block diagram of the present invention.

3 is a flowchart of execution of the present invention.

4 to 9 are detailed flowcharts of one embodiment of each functional module according to the present invention.

* Explanation of symbols for the main parts of the drawings

TMC: Timer control function SCLC: Connectionless control function

SCOC: Access Control Unit SCRC: Routing Control Unit

SCMG: Management Function Unit MTP: Message Transfer Unit

UP: User part

The present invention is located above the message transfer unit (hereinafter referred to as MTP) among the international communication protocol No.7 signaling methods recommended by the International Telegraph and Telephone Advisory Committee (hereinafter referred to as CCITT), and is used to various user units (hereinafter referred to as UP). The present invention relates to a method of implementing a function of a signal connection controller (hereinafter referred to as SCCP) that provides a service.

The SCCP remained undetermined in many parts when the CCITT came into force for the first time in 1984, and an amendment was proposed in 1988, but it has not been implemented so far. The need for its implementation is growing for services. The present invention aims to implement such a function of SCCP in software.

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

1 is a block diagram of hardware for executing software that performs the function of SCCP, and is a central processing connected by a data bus 4, an address bus 5, and a control bus 6 (hereinafter simply referred to as a system bus). A device 1, a memory device 2, and an input / output device 3 are provided.

Such a configuration is a general computer configuration, but to execute an SCCP program, an environment capable of multitasking and inter-process communication between processes must be provided.

The SCCP program is usually stored on disk and read from the input / output device 3 to the storage device 2 when executed, and the SCCP program loaded in the RAM area of the storage device is stored by the central processing unit 1. Is executed.

Once executed, the program stays alive in the RAM area until the system is turned off, and performs the necessary procedures and outputs the appropriate output according to the given input. Details are described in FIGS. 2 to 9.

2 is a functional module block diagram of a software capable of performing the functions of the SCCP, a timer control function unit (hereinafter referred to as TMC) responsible for hair root time control of the SCCP, and a connectionless type service providing a connectionless service. A control function unit (hereinafter referred to as SCLC) 12, a connection type control function unit (hereinafter referred to as SCOC) that provides a connected service, and a routing control function unit responsible for routing the received message (14: SCRC below) And a management function unit (hereinafter referred to as SCMG) for managing information on the signal network state.

As can be seen in FIG. 2, the software for performing the SCCP function according to the present invention is largely divided into the SCCP process 16 and the timer process 11, and the two processes are respectively performed to form a queue structure for information exchange between processes. Having buffers 21 and 22. In addition, the interface between the upper and lower layers is also made through the buffers 17, 18, 19, and 20. In the SCCP process, each function module exchanges information in the form of a function call.

3 is a flowchart of the execution of the software that performs the functions of SCCP. When execution starts, the user first examines the input buffer from the user unit (31) to determine whether the primitive is input (32), and if there is an input, determines which function module should go to (33, 34). Call (35, 36, 37). When this process is completed or there is no input from the user part, the input buffer is examined from the MTP (380) to determine whether the primitive is input (33), and if there is an input, the function module to go to is determined (40). Call (41, 42). When this process is completed or there is no input from the message transfer unit, the buffer from the TMC 11 is examined (43) to determine whether a timer message is input (44), and if there is an input, a timer associated with a function module. It determines whether it is a message (45) and calls the corresponding function module (46, 47). When this process is completed or there is no input from the TMC 11, the user input buffer is checked again.

At this time, the output to the user unit, the message transfer unit, or the output buffer for the TMC 11 is performed by each function module.

4 to 3 are detailed flowcharts of one embodiment of each functional module.

4 is a flowchart of an SCCP timer control function module. The timer control function examines the input buffer (51) to determine whether a message has been input (52), and if there is an input message, determines whether the message requests the timer setting or the message requesting the release (53). ). In the former case, the type of timer is examined (54), and the corresponding timeout value is assigned and inserted into the next timeout waiting list (hereinafter referred to as a list) which is filled in with the relevant data contained in the message (55) ( 56). The position to be inserted at this time is determined based on the assigned timeout value. If it is the case, the timer is searched in the list using the information of the release request message (57), and the found timer is deleted from the waiting list (58). When the above procedure is completed or there is no message input in the input buffer, the input buffer is checked again (51).

5 is a flow chart of the timeout management function module. Every 1 second, the timeout value of the timer (hereinafter referred to as the head) at the head of the list is reduced by one (62) and the timeout value is 0 or less. It is determined whether or not (63). If it is less than 0, wait for 1 second again. If it is less than 0, write a timeout message for the head (64), delete the head from the list (65), and print the timeout message to the output buffer. (66).

FIG. 6 is a flow chart of a connectionless control function module. When a message is input (71), it is determined whether it is a user part primitive (72). . However, if it is not a user part primitive, it is determined whether it is a message from the SCRC (75), or if it is a message sent by the SCRC due to a routing failure (76). Only in step 78), the unit data service message is configured (79) and sent to the routing control function (80). If it was not a routing failure (76), it was a message destined for SCMG (81). In addition, if the message is not from the SCRC, the message is from the SCMG. Therefore, the data is composed of a data message and sent to the routing control function.

7 is a flowchart of the connection type control function module. When a message is input (91), it is judged whether or not it is a primitive from the user unit (92), and if the primitive related to connection setting (93) is called, (94) If the primitive related to disconnection (95) is called (96), the disconnection control function is called (96). If it is a data transfer related primitive (97), the data transfer control function is called (98). If the primitive data transmission-related primitive (99), the rapid data control function is called (100), if the primitives are not the connection reproduction control primitive is called (101). If it is not a primitive from the user, the message from the SCRC is entered, so the procedure is followed. The procedure is the same as above except that the message is not a primitive.

8 is a flowchart of a routing control module. If the message is input (120) if the message transfer unit primitive (121) it is determined whether the SCLC related (122). If it is not related to SCLC, it is SCOC related and performs translation and writing functions (123), and then sends it to the access control unit (24). If it is related to SCLC, it is determined whether it has arrived at the destination, that is, the destination (125). If it arrives at the destination, it is sent to the connectionless control function (126). Perform the necessary translation and routing functions (127) and send them to the message transfer output buffer (128). On the other hand, if it was not the message transfer unit primitive, it is determined whether the message is sent by SCLC (129). If it is a message (130), if the originating point (131) performs a translation and routing function and then sends to the message transfer unit output buffer (132,133).

9 is a flowchart of an SCCP management function module. When a message is entered (141) if it is a message transfer primitive (142), if it is a PAUSE primitive (143), it invokes the signal point prohibition control function (144) and the message transfer mechanism (RESUME). If it is a primitive 145, it calls the signal point admission control function (146). Otherwise, if it is another primitive, it calls the signal point congestion control function because it is a message transfer-status primitive (147). If it is a user part primitive (148), if it is an N-state primitive (149), it calls the subsystem prohibition control function or the subsystem permission control function (151, 152) depending on whether the user service is used (150). If it is not an N-state primitive, it calls the adjusted state change control function because it is an N-COORD primitive (153). If the message is from SCRC, it invokes the subsystem forbidden control function (154, 155). If the above mode is not the mode, since the input message is a management function message from SCLC, the corresponding control function is called according to the type of the management function message (156 to 162).

The present invention has the effect that can be configured and operated as described above to perform a function in software that conforms to the SCCP functional standard recommended by the CCITT.

Claims (3)

CCITT No.7 using a computer structure having a central processing unit (1), a storage unit (2), and an input / output unit connected via a system bus (4, 5, 6) and having a multitasking and interprocess information exchange function. In a method for implementing a common connection signaling (CCP) function, an input buffer from the respective units in the order of a user unit (UP), a message transfer unit (MTP), and a timer control function unit (TMC). 18, 19 and 22, a first step of determining whether a primitive is input, analyzing which function module is a primitive, and calling a corresponding function; A second step of executing the function module called in the first step; And a third step of outputting the result of the execution of the second step to the user unit UP, the message transfer unit MTP, and the timer control function unit TMC through the output buffers 17, 20, and 21. A method of implementing a signal connection control unit function of the CCITT No.7 common line signal method, characterized in that performed by. The control module according to claim 1, wherein the function module performed in the second step is a connectionless control function module according to an input type if the input in the first step enters the input buffer 18 of the user unit UP. Either of the connected type control module or the management function module is called and executed, and if the input in the first step enters the input buffer 19 on the MTP side, the routing control function according to the input type. If either the module or the management function module is called and executed, and the input in the first step enters the input buffer 22 on the timer control function unit (MTC) side, the connected control function module or management according to the input type. A method for implementing a signal connection control unit function of a CCITT No.7 common line signaling method, wherein any one of function modules is called and performed. The method of claim 2, wherein in the third step, the output to the output buffer 17 of the user unit UP is performed by any one of a connectionless control module, a connection control module, or a management module. The output to the output buffer 20 on the message transfer unit MPT side is performed by the routing control function module, and the output to the output buffer 21 on the timer management function unit TMC side is connected to the control module or the management function module. Any one of the CCITT No. 7 method of implementing a signal connection control unit function of the common line signal method.

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