KR100410868B1 - STRUCTURE FOR MTP LEVEL2 PROTOCOL OF SIGNALING SYSTEM No.7 ON REAL-TIME OPERATING SYSTEM - Google Patents

Abstract

The present invention relates to an MTP level 2 protocol structure of signaling system number 7 on a real-time operating system. The function of the signaling system number 7 (SS7) MTP level 2 protocol used in most conventional exchanges is a commercial chip. ), It is not possible to actively accept changes in the standard, and it is not possible to flexibly cope with the situation such as interworking with other networks.

The present invention has been made to solve the above-mentioned conventional problems, the receiving task for receiving a message received from the power station and transmits to the MTP (Message Transfer Part) level 3 when the message signal (MSU); A filling signal task for transmitting a filling signal message FISU to a power station when there is no message signal MSU to transmit; A link state task for transmitting a link state message (LSSU) indicating the link state information to the power station; A transmission task for receiving a message received from the MTP level 3 and transmitting the received message to the power station in the case of a message signal (MSU); Distribute the events received from the reception task and the transmission task to each sub function module to cause a state transition of each sub function module, and perform synchronization control so that the transmission task, the fill signal task, and the link state tasks can operate exclusively. By implementing the SS7 MTP Level 2 protocol structure on the RTOS consisting of event tasks, it is possible to actively accept changes in the standards, and to flexibly cope with situations such as interworking with other networks. have.

Description

STRUCTURE FOR MTP LEVEL2 PROTOCOL OF SIGNALING SYSTEM No.7 ON REAL-TIME OPERATING SYSTEM}

The present invention relates to a message transfer part (MTP) Level 2 protocol structure of signaling system No. 7 on a real-time operating system. In particular, the present invention relates to a task for processing work by synchronization and communication between tasks having respective priorities. MTP level 2 protocol structure of signaling system number 7 (SS7) for reliably transmitting call processing-related signaling messages of a switching period in a public switched telephone network (PSTN) on a real-time operating system (RTOS).

Conventional multitasking operating systems such as Unix and Windows provide a multitasking environment, how to use hardware resources efficiently, and how equitably to distribute them to users. On the contrary, the real-time operating system (RTOS) is built into the embedded system and guarantees a certain output within a specified time limit. Therefore, even if you waste some of your hardware resources, you want to meet the time constraints of your work and allow tasks with a higher priority than fairness to perform for many hours.

In general, the RTOS has three requirements for real-time operating systems: multitasking, process threads that can be processed according to priority, and a sufficient number of interrupt levels.

For example, an operating system can be designed to ensure that an object can be used by robots on an assembly line. In what is called a "hard" real-time operating system, a calculation is made to make the object available within a specified time. If it is not possible, the operating system will end in failure, and in a "soft" real-time operating system, the assembly line will continue to operate, but the objects will not appear at any given time, resulting in a temporary impact on the robot's movement. This can lead to reduced production output.

Currently, the function of SS7 MTP Level 2 protocol used in most exchanges is implemented using commercial chips, so it is not able to actively accept changes in the standard, and the situation such as interworking with other networks There was a problem such as not able to cope flexibly.

Accordingly, the present invention was devised to solve the above-mentioned problems, and it is an MTP level 2 protocol of SS7 on an RTOS that actively accepts changes in the standards and flexibly copes with situations such as internal work with other networks. The purpose is to provide a structure.

1 is a schematic diagram showing the structure of the SS7 MTP Level 2 protocol applied to the present invention.

2 is a task classification table for performing the function of the SS7 MTP Level 2 protocol applied to the present invention.

3 is an exemplary view showing a communication and synchronization control flow applied to the present invention.

4 is an exemplary view showing an event distribution structure applied to the present invention.

5 is an exemplary view showing a state transition method of a lower function module applied to the present invention.

6 is an exemplary table showing an event according to the state of each sub-function module in FIG.

The MTP level 2 protocol structure of signaling system No. 7 on the real-time operating system according to the present invention for achieving the above object is a message transfer part (MTP) level in the case of a message signal (MSU) received from a large station. A receiving task for transmitting to 3; A filling signal task for transmitting a filling signal message FISU to a power station when there is no message signal MSU to transmit; A link state task for transmitting a link state message (LSSU) indicating the link state information to the power station; A transmission task for receiving a message received from the MTP level 3 and transmitting the received message to the power station in the case of a message signal (MSU); Distribute the events received from the reception task and the transmission task to each sub function module to cause a state transition of each sub function module, and perform synchronization control so that the transmission task, the fill signal task, and the link state tasks can operate exclusively. Characterized in that it comprises an event task.

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

FIG. 1 is an exemplary view briefly showing the structure of the SS7 MTP Level 2 protocol applied to the present invention. As shown in FIG. 1, the MTP Level 2 10 receives a message received from a large power station and transmits a message signal (hereinafter referred to as 'MSU'). Receive_Task for transmitting to the message delivery unit (hereinafter referred to as 'MTP') Level 3 in the case of; A filling signal task (FISU_Task) for transmitting a filling signal message to a power station when there is no MSU to transmit; A link state task (LSSU_Task) for transmitting a link state message indicating information of the link state to a power station; A transmission task (Transmit_Task) for receiving the message received from the MTP level 3 and transmitting it to the power station in case of MSU; Distributing events received from the receive task Receive_Task and the transmit task Transmit_Task to each sub-function (hereinafter referred to as a 'module') to cause a state transition of each module, and the transmit task (Transmit_Task) and the fill signal task (FISU_Task) and the link state task (LSSU_Task) is composed of an event task (Event_Task) for performing a synchronization control to operate exclusively.

Referring to the accompanying drawings, the operation of an embodiment according to the present invention configured as described above will be described.

2 is a task classification table for performing a function of the SS7 MTP Level 2 protocol applied to the present invention. As shown therein, a value of a task ID is a value that is arbitrarily assigned to distinguish each task. As such, the actual value may vary from implementation to implementation. In addition, the lower the task priority value, the higher the priority, and the Receive_Task and Transmit_Task values of the Signaling Transfer Point (STP) where messages are frequently sent and received. Use the same priority when used in the system. When used in a signaling end point (SEP) system where the frequency of received messages is higher than that of a transmitted message, the priority of the receiving task may be higher than that of the transmitting task.

In addition, the priority of the filling signal task FISU_Task may be adjusted in priority with respect to the quality state grasping time of the signal link, and the event task Event_Task may receive an event from a transmit task other than the receive task Task_Transmit_Task. The MTP level 2 state transition is received and all MTP level 2 operations are dependent on the state at the time of performing the operation. Therefore, the MTP level 2 has a higher priority than other tasks except the receiving task and the transmitting task.

Each of the classified tasks performs a module function for performing an MTP level 2 function. As shown in FIG. 3, communication between each task for performing an overall MTP level 2 function is performed by a message queue. The event task Event_Task receives an event causing a state transition of the MTP level 2 from the reception task Receive_Task and the transmit task Transmit_Task to transition the state of the MTP level 2 and transmits the MSU. Synchronization control is responsible for exclusively operating the transmit task Transmit_Task, the fill signal task FISU_Task that transmits the fill signal message, and the link state task LSLS_Task that transmits the link status signal message (synchronization method). A semaphore is used by two or more programs or processes that run by sharing information at the same time. Basic operations for synchronization used to set the coordination of activities), event flags, etc.).

The MTP Level 2 state transition is in charge of an event task (Event_Task), and the event distribution structure in the event task is as shown in FIG. That is, the MTP Level 2 protocol functions are classified into several sub-function modules to achieve the overall functions. The types of sub-function modules are largely classified as error rate monitor (AERM), basic transmission control (BTXC), and basic reception control (BRC). , Runaway limit control (CC), limit alignment and error detection (DAEDR) at reception, limit alignment and error detection (DAEDT) at transmission, initial alignment control (IAC), link state control (LSC), process stop control (POC) And signal message error rate monitor (SUERM).

The role of the event task Event_Task distributes the event information received from the transmit task Transmit_Task and the receive task Receive_Task to the corresponding lower function module, thereby generating a state transition of each module.

That is, according to the ITU-T Q.702 recommendation, as shown in Fig. 5, Fig. 6A to Fig. 6C, each sub-function module has a combination of a state value (Module_Current_State) having a current state and a received event. Performs an event action (Event_Action) to be taken when an event received in the current MTP level 2 state from the function module action table (Module_Action_Table) is generated.

The result of the event operation includes a state value (Module_Next_State) that the corresponding lower function module should have after performing the event operation, and this state value (Module_Next_State) is replaced with the state value (Module_Current_State).

As described above, the present invention implements the SS7 MTP Level 2 protocol on a real-time operating system (RTOS) to actively accommodate changes in the standard, and is flexible to situations such as interworking with other networks. There is an effect such as to be able to cope.

Claims (2)

A receiving task for receiving a message received from a large power station and transmitting the received message to a MTP (Message Transfer Part) level 3 when the message signal is an MSU; A filling signal task for transmitting a filling signal message FISU to a power station when there is no message signal MSU to transmit; A link state task for transmitting a link state message (LSSU) indicating the link state information to the power station; A transmission task for receiving a message received from the MTP level 3 and transmitting the received message to the power station in the case of a message signal (MSU); Distribute the events received from the reception task and the transmission task to each sub function module to cause a state transition of each sub function module, and perform synchronization control so that the transmission task, the fill signal task, and the link state tasks can operate exclusively. An empty level 2 protocol structure of signaling system number 7 on a real-time operating system, characterized in that it comprises an event task. The method of claim 1, wherein the event task is configured to determine whether an event is received in a state of a current MTP level 2 from a subfunction module action table having a combination of a received state and a first state value having a current state of each subfunction module. The signaling system number on the real-time operating system, characterized in that to perform an event operation to be taken when an occurrence occurs, and to replace the second state value that the lower function module should have with the first state value after the event operation. 7 Level 2 protocol structure.