KR20010002522A - Method for initializing and restarting of No.7 protocol element - Google Patents

Abstract

PURPOSE: A method for initializing and restarting No.7 protocol elements is provided to comprehensively manage the availability of each application entity(AE) when initializing the No.7 protocol elements, and to make a specific AE manage the state information of a sub system of a remote station, thereby reducing communication loads between processors and detecting errors of processors and restoring an error state to an available state. CONSTITUTION: If each application entity(AE) performs initialization and an application service element part receives available messages the AE generated in an available state from every AE, the application service element part transmits available messages for application service element part to a transaction capability application part(TCAP). If the TCAP transmits available messages for TCAP to a signaling connection control part(SCCP), the SCCP transmits state information messages for a sub system of a remote station to the application service element part through the TCAP. The application service element part transmits the information messages for the sub system of the remote station to a specific AE comprehensively managing the sub system information of the remote station, to update a database in the specific application part.

Description

No. 7 Method for initializing and restarting protocol element {Method for initializing and restarting of No.7 protocol element}

The present invention relates to a common line signaling method of a mobile communication system, and in particular, each application part is available when initializing No. 7 protocol components used for communication between a switch and other network components. By comprehensively managing the status and managing the status information of the power subsystems in a specific application unit, it reduces the communication load between processors and causes the individual failure of the No.7 protocol element or the failure of the processor performing No.7 protocol function. The present invention relates to a method of initiating and restarting a No.7 protocol element that improves the availability of the No.7 protocol stack by detecting it and recovering it to an available state when it occurs.

In general, there are channel associated signaling (CAS) and common channel signaling (CCS) for transmitting signals for controlling a call service between exchanges. Individual signaling means that signal related to each call is transmitted through call line, and common line signaling means that call line and signal line are operated separately as in NO.7 signaling and transmit signal for call through signal line. This means that it is done.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system employing a common line signaling method that provides abundant signal capacity, high speed transmission, error detection and correction functions, and more particularly to a mobile communication system employing No. 7 signaling.

In general, the No. 7 protocol stack is composed of an application unit, a question-and-answer function unit, a signal connection control unit, and a message transfer unit. Compared to the Open System Interconnection (OSI) model, the message delivery unit performs the layer 1 and layer 2 functions of the OSI and also performs some of the layer 3 functions. The signal connection control unit performs some functions of layer 3, the question and answer processing unit performs some functions of layer 4-layer 6 and part 7, and the application unit performs some functions of layer 7.

When there are a plurality of application units, when the plurality of application units are in a state that can be operated by performing initialization, respectively, that is, the available state, each application unit transmits a message indicating the available state to the signal connection control unit of the own station. The signal connection control unit receiving the message transmits the sub system status information of the large station to the application unit of the own station to manage it. In this case, the application service element unit individually manages the available states of the application units instead of comprehensively, thereby updating the subsystem state information of the large station even when one of the application units is initialized.

That is, when each application part becomes available and transmits the application part available message from each application part to the application service element part, the application service element part sends the application service element part available message to the Q & A application part whenever each application part available message is received. As a result, the communication load between the application service component unit and the question-and-answer function application unit is increased.

In addition, even when one application unit is initialized, the system status information of the power station is updated. By managing all of the application system state information, the inter-processor communication load is increased.

On the other hand, when the exchange has a failure in the IPC communication during the inter-processor communication (IPC) with other network elements, since the failure for this IPC communication can not be detected conventionally, No.7 signaling message processing is performed. Since the local state of the sub-system is not available, the management state has the available state information, and the system state management mismatch occurs.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of the present invention is

When the initialization of No.7 protocol component used for communication between the switch which is a network component of the mobile communication system and other network components, comprehensively manages the available state of each application unit, and the state of the sub-system in a specific application unit. The present invention provides a method for initializing No. 7 protocol elements by reducing information load by managing information.

Another object of the present invention is to improve the availability of the No.7 protocol stack by detecting and recovering to an available state when an individual failure of the No.7 protocol element or a processor performing the No.7 protocol function occurs. It provides a method for restarting a No.7 protocol element.

In order to achieve the above object, the initialization method of No. 7 protocol element according to the present invention,

When each application performs initialization and receives an application part available message, which occurs when it becomes available, from the application part, and the application service element part transmits the application service element part available message to the Q & A function application part;

When the application process component receiving the application service element part available message transmits the question processing function application part available message to the signal connection control unit, the signal connection control unit transmits a sub-system status information message to the application processing function application unit through the question processing function application unit. Transmitting to the element part;

The method comprises that the application service element part receiving the power subsystem information message transmits the power subsystem information message to a specific application that oversees the power subsystem information and updates the database in the specific application. Features of the jacket.

In order to achieve the above object, the restart method of No. 7 protocol element according to the present invention,

The state of the Signal Message Handling Processor (SMHP) that processes the No.7 protocol signaling message has changed, prompting you to change the SMHP route table for managing the available status information of the SMHP. If received, the question and answer processing function application stores the change information in a database and retrieves an SMHP route table of a previous state;

As a result of the search, if one or more SMHPs are changed from the unavailable state to the available state, restart the No.7 protocol element, and if the search results show that at least one SMHP is all available, at least one SMHP is available. The method configuration is characterized in that it does not restart when the status of SMHP is changed except when the status is changed.

In order to achieve the above object, the restart method of No. 7 protocol element according to the present invention,

In case of a failure in Inter Processor Communication (IPC) between a local station and another station, when a local system failure message notifying a system abnormality is broadcasted by a system state control unit located in the local exchange that controls and manages the state of the exchange. A non-availability setting step of setting a state of the local subsystem of the processor as unavailable by the local subsystem failure message;

When the local station failure control message informing the normal state of the system is broadcasted by the system state control unit, the local subsystem failure message includes a restarting step of restarting the processor in charge of the No.7 protocol function which was not available. It is characterized by the configuration.

The restarting step may include: an application unit and an application service element unit for changing a local station subsystem that is in an unusable state from the question-and-answer function application unit when the local station failure control message informing the system normal is broadcasted by the system state control unit. Performing an initialization procedure of the question-and-answer function application unit; The question and answer processing function application unit may transmit the message processing function application unit available message to the signal connection control unit and sequentially restart the processor in charge of the protocol function No. 7.

1 is a block diagram of a No. 7 protocol element to which the present invention is applied;

2 is a flowchart showing a method for initializing No. 7 protocol elements according to the present invention;

Figure 3 is a flow chart showing a restart method in the individual failure recovery of No.7 protocol elements according to the present invention,

Figure 4 is a flow chart showing a restart method for failure recovery of a processor in charge of No. 7 protocol function according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1-N: Application part 10: Application service element part

20: Question processing function application unit 30: Signal connection control unit

Hereinafter, the method of initialization and restart of the protocol element No. 7 of the present invention as described above will be described in detail with reference to the accompanying drawings.

1 shows a No. 7 protocol stack element configuration to which the present invention is applied.

Reference numeral 30 is a Signaling Connection Control Part (SCCP), which conveys circuit-related or non-line-related information between exchanges or network special facilities from a NO.7 signaling network to a connected or disconnected network layer service. In order to provide additional functions to the function of the Message Transfer Part (MTP). Therefore, Level 3 of the signal connection control unit and the message transfer unit provide network layer (layer 3) services of the OSI reference model.

Reference numeral 20 denotes the Transaction Capability Application Part (TCAP), which is a line-related, diverse application distributed across switching functions and special centers (e.g. databases, special equipment units, operations & maintenance centers). It provides functions and protocols.

Reference numeral 1-N denotes Applicaiton Entities (AEs), which represent a communication function of an application element, and 10 denotes an application service element part, which is an application for a specific service. Locate and perform some protocol functions of layer 7 (layer 7 of OSI), for example, a mobile application unit.

The method in which this No. 7 protocol element is initialized by the present invention is shown in FIG.

As shown in the drawing, if all of the application units 1-N have transmitted the application unit available message, the application service element unit 10 transmits the application service element unit available message to the answer processing function application unit 20 ( ST11-ST13); When the question and answer processing function application unit 20 that has received the application service component part available message transmits the question and answer processing function application part available message to the signal connection control part, the signal connection control part 30 transmits the sub-system status information message to the question and answer. Transmitting to the application service element unit 10 through the processing function application unit 20 (ST14-ST16); The application service component unit 10 having received the sub system information message transmits the sub system information message to a specific application unit that oversees the sub system information and updates the database in the specific application unit (ST17). ST18).

The initialization method of No. 7 protocol element according to the present invention will be described as follows.

First, when each application unit 1-N is initialized and becomes available, the application unit availability message is transmitted to the application service element unit 10 (ST11). The application service element unit 10 checks whether all N application units 1-N have transmitted the application part available message, and transmits the application part available message from all N application parts 1-N. Only when the application service element part transmits the available message to the question and answer processing function application unit 20 (ST12, ST13).

When the question and answer function application unit 20 receives the application service element unit available message from the application service element unit 10, the question and answer function application unit 20 transmits the message to the signal connection control unit 30 (ST14). When receiving the message processing function application unit available message in this way, the signal connection control unit 30 transmits the M power station status information messages managed by the signal connection control unit to the question processing function application unit 20 (ST15). .

Then, the question-and-answer function application unit 20 transmits the M power subsystem status information messages to the application service component unit 10 (ST16), and the application service component unit transmits the N power subsystem subsystem status information messages to the N powers. Instead of transmitting to all the application units, only the specific application unit which supervises the power subsystem information (ST17). The specific application unit then updates the M power subsystem status information in the database (ST18). In this way, the application service component unit transmits only the sub system status information message to all the application units, and transmits only the specific application unit and updates the subsystem information of the power station only in the specific application unit, thereby reducing the load on the processor during the initialization process.

In addition, the application service element unit comprehensively manages the availability status of the application units when each application unit is individually initialized. It transmits only once, thereby updating the subsystem information of the power station only once, thereby reducing the load on the processor during the initialization of the No.7 protocol element.

Figure 3 is a flow chart showing a restart method in the individual failure recovery of No.7 protocol elements according to the present invention.

As shown, if the state of the Signal Message Handling Processor (SMHP) for processing the No.7 protocol signal message is changed, the question and answer function application unit 20 for managing the available state information of the SMHP. Transmitting a message to change the SMHP route table (ST21, ST22); Receiving the SMHP route table change message, storing the message in a database, and retrieving previous SMHP route tables (ST23, ST24); As a result of the search, if at least one SMHP has been changed from the unavailable state to the unavailable state, restarting No.7 protocol elements to update the state information of the local subsystem (ST25, ST26). .

As a result of searching the previous SMHP route table, restarting is not performed when the SMHP state is changed except when one or more SMHPs are changed from the unused state to the available state.

Referring to the restart method for the individual failure recovery of No.7 protocol elements according to the present invention as follows.

First, the signal connection control unit 30 includes a plurality of Signal Message Handling Processors (SMHPs) for processing No. 7 protocol signal messages. Thus, the SMHP transmits its own No. 7 protocol signal message to another station so that communication between the own station and another station can be performed.

The SMHP can communicate with its own station and other stations only when it is available, and when it becomes unavailable, it cannot communicate with it. So, in order to manage the available state of the SMHP, the question and answer processing function application unit 20 is provided with the SMHP route table. With reference to this SMHP route table, the No.7 signaling message is transmitted to the available SMHP.

The signal connection control unit 30 checks the available / non-available state change of the SMHP, and transmits a message to the question processing function application unit 20 to change the SMHP route table when the state change is made (ST21, ST22).

Then, the question-and-answer function application unit 20 stores the change information of the SMHP route table change message in the database (ST23). The previous SMHP route table is searched (ST24).

As a result of the retrieval, restarting is performed only when one or more SMHPs are changed from the unavailable state to the available state, thereby updating the state information of the subordinate subsystem (ST25, ST26).

If the question-and-answer function application unit 20 searches the previous SMHP route table, restarting is performed in the case of other state changes other than when one or more SMHPs are changed from one state to the other when the state is not available. Do not perform. That is, even if one SMHP is changed from an available state to another available state, the question-and-answer function application unit 20 does not perform initialization (restart).

In the related art, the question and answer processing function application unit 20 performs initialization when all SMHP available / disabled states are changed. This puts a lot of load for managing SMHP state changes.

However, according to the present invention, the question-and-answer function application unit 20 performs initialization only when it is necessary to change one or more SMHPs from an unusable state to an available state. Can be reduced.

4 is a flowchart illustrating a restart method in the failure recovery of a processor in charge of the protocol function No. 7 according to the present invention.

As shown, if a failure occurs in the interprocessor communication (IPC) between the own station and another station, the local subsystem failure informing the system abnormality of the system state control unit located in the local exchange and controlling and managing the state of the exchange. A non-availability setting step (ST31) of setting the state of the local subsystem of the processor to unavailable by this local subsystem failure message when the message is broadcasted; When the local station failure control message informing the normal state of the system is broadcasted by the system state control unit, a restart step (ST32-ST34) is performed by the local station failure message to restart the processor in charge of the No. 7 protocol function which was not available. Perform.

The restarting step (ST32-ST34), when the local station failure control message informing the normal state of the system in the system state control unit, the application unit for changing the local station subsystem that was not available in the question processing function application unit to the available state; Performing an initialization procedure of the application service element unit and the question-and-answer function application unit (ST32 and ST33); The question and answer processing function application unit 20 sequentially transmits the message processing function application unit available message to the signal connection control unit 30 and restarts the processor in charge of the protocol function No. 7 (ST34).

The restart method for failure recovery of the processor in charge of the protocol function No. 7 according to the present invention will be described as follows.

The system state control unit, which is located in the local exchange and controls and manages the state of the exchange, monitors the state of Inter Processor Communication (IPC) between the local station and another station. Thus, if the monitoring results in a failure in IPC communication, the system is notified of the failure by broadcasting its own subsystem failure control message.

Thus, the signal connection control unit 30 among the No. 7 protocol elements that have received the slave station failure control message sets the state of the slave station of the processor SMHP to an unavailable state (ST31). Accordingly, the processor SMHP of the signal connection control unit 30 transitions to a state in which a user cannot provide a service (User Out of Service).

Then, when the failure is recovered to a normal state, the system state controller broadcasts a local subsystem failure control message indicating that the local subsystem is in a normal state. The question-and-answer function application unit 20 of the No. 7 protocol element that has received this self-subsystem failure control message has the application unit 1-N and the application service element unit to change the sub-subsystem which is not available to the available state. (10) performs the initialization procedure of the question-and-answer function application unit 20 (ST33). At this time, the initialization procedure is performed by the initialization method according to the present invention shown in FIG.

When the initializing process of the application unit 1-N, the application service element unit 10, and the question and answer function application unit 20 is performed, the question and answer processing function application unit 20 is the question and answer processing function application unit 20. The question and answer processing function application unit available message informing that the available state is transmitted to the signal connection control unit 30 (ST34). Thus, the signal connection control unit 30 sets the local sub-system which was in an unusable state to an available state, and becomes a state capable of performing a service of a user (User In Service; UIS).

The present invention can be applied to exchanges using the No. 7 protocol as well as other network elements using the No. 7 protocol.

As described above, the method of initializing and restarting the No.7 protocol element according to the present invention detects the failure of an individual fault of the NO.7 protocol element or the failure of the processor in charge of the function of the NO.7 protocol. By restarting the protocol element and restoring it to an available state, there is always an effect of ensuring the availability of the NO.7 protocol stack.

In addition, when initializing the No.7 protocol component used for communication between the switch which is a network component of a mobile communication system and other network components, comprehensively manages the available state of each application unit, and plays a sub-system in a specific application unit. By managing the state information of the, it is possible to reduce the communication load between the processors, reduce the number of access to the database, there is an effect of improving the system performance.

Claims (4)

In the mobile communication system using the No.7 signaling method, in the method of initializing the No.7 protocol element of the application unit, the application service element unit, the question and answer processing function application unit, the signal connection control unit, When each application performs initialization and receives an application part available message, which occurs when it becomes available, from the application part, and the application service element part transmits the application service element part available message to the Q & A function application part; When the application process component receiving the application service element part available message transmits the question processing function application part available message to the signal connection control unit, the signal connection control unit transmits a sub-system status information message to the application processing function application unit through the question processing function application unit. Transmitting to the element part; The application service component unit having received the sub system information message transmits the sub system information message to a specific application unit that oversees the sub system information and updates the database in the specific application unit. .7 How to initialize protocol elements. In the mobile communication system using the No.7 signaling system, in the No.7 protocol element restarting method of the Q & A processing application application part among the No.7 protocol elements, The state of the Signal Message Handling Processor (SMHP) that processes the No.7 protocol signaling message has changed, prompting you to change the SMHP route table for managing the available status information of the SMHP. If received, the question and answer processing function application stores the change information in a database and retrieves an SMHP route table of a previous state; As a result of the search, if one or more SMHPs are changed from the unavailable state to the available state, restart the No.7 protocol element, and if the search results show that at least one SMHP is all available, at least one SMHP is available. Restarting method of No.7 protocol element, characterized in that it does not perform restart when the status of SMHP is changed except when the status is changed. In the communication between the network element and the network element of the mobile communication system using the No.7 signaling method, in the method of restarting the No.7 protocol element in the event of a failure of the processor in charge of the function of the NO.7 protocol, In case of a failure in Inter Processor Communication (IPC) between a local station and another station, when a local system failure message notifying a system abnormality is broadcasted by a system state control unit located in the local exchange that controls and manages the state of the exchange. A non-availability setting step of setting a state of the local subsystem of the processor as unavailable by the local subsystem failure message; When the local station failure control message informing the normal state of the system is broadcasted by the system state controller, the local station failure message performs a restarting step of restarting the No. 7 protocol function processor in an unusable state. Restart method of No.7 protocol element. The method of claim 3, wherein the restarting step, When the local station failure control message indicating the normal state of the system is broadcast by the system state control unit, an application unit, an application service element unit, and a question and answer function function are applied to change the local subsystem, which was not available, from the question processing function application unit to an available state. Performing a negative initialization procedure; Restarting the No.7 protocol element by sequentially transmitting the message processing function application unit available message to the signal connection control unit and restarting the processor in charge of the No.7 protocol function. Way.