KR20020054557A - Method for monitoring state of processor in no.7 signalling system - Google Patents

Abstract

The present invention relates to a No.7 signal system, and more particularly, to a method for monitoring a local processor state of a message delivery unit.

The present invention provides a processor state monitoring method of a No. 7 signal system comprising a message transfer unit for transmitting a signal message and a user unit performing a communication service, the method comprising: transmitting a message for monitoring to the message transfer unit; Checking whether a response message for the monitoring message is received within a preset time from the message transfer unit after transmitting the message; and determining that the message transfer unit is in a normal state when a response message is received within the preset time. The process takes place.

Description

No.7 How to Monitor Processor Status in Signaling Systems TECHNICAL FOR MONITORING STATE OF PROCESSOR IN NO.7 SIGNALLING SYSTEM

The present invention relates to a No.7 signal system, and more particularly, to a method for monitoring a local processor state of a message delivery unit.

In general, the No.7 signal method is a common line signal method in which signal information different from the 64 kbps user information channel is transmitted to a 64 kbps dedicated signal channel shared by a plurality of user information channels. In addition, the No.7 signaling method includes a message transfer part (MTP) having a function of transferring variable length control information (signal message) to a designated exchange via a signal network, and a line connection control using the same. It is divided into a user part (UP) which realizes a communication service. The message delivery unit has three levels of level 1 to level 3, and the processor outage in the No. 7 signaling system is a function of the message delivery unit level 2 or higher. Level, that is, message delivery level 2 and message delivery level 3. In this case, the use of a link is excluded when a processor stop condition occurs. In this case, the processor stop refers to a situation in which signaling messages cannot be transmitted to the message transfer unit level 3 and / or higher level (level 4). When the message transfer unit level 2 is aware of a local processor stop, it transmits to a link status signal unit (LSSU) indicating the processor stop, and transmits all received message signal units (MSUs). Discard the Message Signal Unit. Meanwhile, the signal point receiving the processor outage continuously transmits a fill-in signal unit (FISU) to the outgoing signal point. When the local processor recovers from processor outage, this signal point sends the FISU to the power signal point and receives the signal point to restore normal service state for this signal link. When the long term T1 (500-1200 ms) stop is detected by the MTP timer of the message transfer unit, the buffer of the message transfer unit level 2 is flushed to prevent unnecessary message transmission. .

Here, the local processor state monitoring procedure according to the prior art will be described with reference to FIG. 1.

1 is a diagram illustrating a local processor state monitoring procedure according to the prior art.

First, when a failure occurs in an arbitrary local processor and reaches a quiescent state, a primitive for a local processor outage indicating a local processor stop is transmitted. The message forwarder level 3 111 receives a primitive for local processor outage, and thus notifies the message forwarder level 2 113 of the occurrence of the local processor outage. Then, the message transfer unit level 2 113 transitions the signal link of the corresponding local processor to an inactive state in response to the recognition of the local processor stop, and indicates a link status signal unit (LSSU) indicating the local processor stop. ) Is transmitted to an adjacent signal point, and all received message signal units (MSUs) are discarded. Meanwhile, the signal point receiving the processor outage continuously transmits a fill-in signal unit (FISU) to the outgoing signal point.

As described above, the local processor state monitoring procedure according to the related art has only implemented a procedure for transmitting a primitive indicating the local processor outage to the message transfer unit level 2 in the message transfer unit level 3. . In the text of the recommendation, it is described that a processor stop due to a failure occurs only at a higher level of message transfer level 2, that is, message transfer level 3 and level 4. Thus, the task of monitoring the status of message delivery level 3 in message delivery level 2 has not been implemented, so the necessity of the task of monitoring the status of message delivery level 3 in message delivery level 2 arises. have. In addition, the status monitoring task for the processors of the higher level, ie, level 4, at the message transfer level 3 was not implemented so that it was impossible to monitor why the local processor stop occurred when the local processor stop occurred. In addition, in Recommendation 07/96, a procedure for transmitting a Status Indication "PO" (SIPO) indicating a local processor outage is received at the message forwarding level 3 and sent back to each corresponding destination. If the message delivery unit level 3 fails and it is impossible to send the primitive indicating the local processor stop to the message delivery unit level 2, a serious problem may arise and the message delivery unit level 3 There is a need for a task to monitor this.

It is therefore an object of the present invention to provide a method for monitoring the status of message delivery level 3 in message delivery level 2.

Another object of the present invention is to provide a method for monitoring the status of a higher layer in the message transfer unit level 3.

It is still another object of the present invention to provide a method for monitoring a cause of a processor stop state.

Method according to the first aspect of the present invention for achieving the above objects; 7. A processor state monitoring method of a signal system comprising: a message transfer unit for transmitting a signal message and a user unit performing a communication service, the method comprising: transmitting a message for monitoring to the message transfer unit; Checking whether a response message for the monitoring message is received from the message transfer unit within a preset time after transmission, and determining that the message transfer unit is in a normal state when a response message is received within the preset time. It is characterized by.

According to a second aspect of the present invention for achieving the above objects; 7. A method for monitoring processor status of a signal system comprising: a message delivery unit level 2 for preventing transmission of a message and transmitting the message; and a message delivery unit level 3 for performing routing and maintenance functions for processing the message. And transmitting a message for monitoring to the message transfer unit level 3, and checking whether a response message for the monitoring message is received within a preset time set from the message transfer unit level 3 after transmitting the message. And determining that the message transfer unit level 3 is in a normal state when the response message is received within the set time.

Method according to the third aspect of the present invention for achieving the above objects; A message transfer unit level 2 that prevents and transmits a message transmission error, a message transfer unit level 3 that performs routing and maintenance functions for processing the message, and a fault that is executed when the operation of the message transfer unit level 2 starts. 7. A method for monitoring a processor state of a signaling system, comprising: a management block, wherein the failure management block transmits a message for monitoring to the message transfer unit level 3 as a message transfer unit level 2 is started; Checking whether a response message for the monitoring message is received within a preset time from the message transmitter level 3 after transmitting the message; and if the response message is received within the preset time, level 3 Is determined to be in a normal state and the message transfer unit to the message transfer unit level 2 Characterized the bell 3 is constituted by any process for notifying that the normal state.

1 is a diagram illustrating a local processor state monitoring procedure according to the prior art.

FIG. 2 is a diagram illustrating a No. 7 signal system hierarchy for performing a function in an embodiment of the present invention. FIG.

3 is a diagram illustrating a local processor state monitoring procedure of a message transfer unit level 2 according to an embodiment of the present invention.

4 is a diagram illustrating a local processor state monitoring procedure of a message transfer unit level 3 according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

2 is a diagram illustrating a No. 7 signal system hierarchy for performing a function in an embodiment of the present invention.

First, the No.7 signaling system, which is a common line signaling method, uses a message transfer part (MTP) having a function of delivering variable length control information (signal message) to a designated exchange via a signaling network. It is divided into a user part (UP) that realizes communication services such as line connection control, and is further divided into a level 4 and a message transfer part. Here, the message delivery unit is composed of three levels from the message delivery unit level 1 to the message delivery level 3, the level 4 is an application (251) and a telephone user part (TUP: Telephone User Part) (253) And ISDN User Part (255), TC Application Part (TCAP) 257, RLOE 259, and Signaling Connection Control Part (SCCP) 261. It is composed of

The message transmitter 200 is composed of a level 1 (211), a level 2 (213), a level 3 (215), the message transmitter level 1 (211) and the transmission of a physical signal channel (signal data link) Configure the access function, and the message forwarding unit level 2 213 is configured to control the higher data link control when the message signaling unit (message) is transferred on the signal link to the next node (signaling point SEP or signaling point STP) of the signaling network. Using a similar procedure to HDLC, transmission errors are prevented to ensure reliable delivery. The message transfer unit level 3 215 is mainly a signal network function for processing a signaling message, that is, a function for distributing a message received from a called point to an accurate user part in an exchange and an accurate relay signal for a message transmitted to another exchange. Includes functions for routing to links. In addition, the message forwarder level 3 215 also controls all operational and maintenance functions in the signaling network, which includes the functions of distributing the signal traffic load over multiple signal links or reconfiguring the signal path in the event of a failure. do. In addition, the control information used in the function of the message forwarding unit level 3 (215) includes the address of an originating exchange (origin point code (OPC)), a destination exchange (destination point code (DPC)), Signaling Link Selection (SLS) and Service Information Octet (SIO) identification. Here, by using a service indicator (SI), which is a subfield of the service information octet, the incoming message is routed to the correct user part (ISDN user part, telephone user part, etc.) within the same exchange, and the message is actually assigned to a certain specific part. A previous step evaluation (message discrimination function) of the called point code indicating whether or not to be delivered to the signal point is made. The forwarding message at another exchange on the terminating link, such as the forwarding message at the user part in the outgoing exchange, is routed to the appropriate outgoing signaling link in the incoming direction based on the called point code.

The signal connection control unit 261 has a function of transmitting various signals or general data information other than a normal call control signal using a No. 7 signal network. The signal connection control unit 261 is located above the message transfer unit 200 and configures a function of the OSI reference model level 3 by a combination of the message transfer unit 200 and the signal connection control unit 261. The purpose of the signal connection control unit 261 is to access transaction No. 7 message transmission unit 200 to transmit transaction-oriented data, and is divided into a connectionless service and a connection-oriented service.

The ISDN user unit 255 includes both a user function for a voice and a non-voice service and a signal function for providing an exchange service, and is applicable to a dedicated telephone, a circuit switched data network, and an analog network. The ISDN user unit 255 may directly access the message transfer unit 200, and may use the message transfer unit 200 through the signal connection control unit 261, but the signal connection control unit 261 may be used. In the case of passing through, there is a tendency to support the function of the ISDN user unit 255 in the TC. In addition, the ISDN user unit 255 controls signal information exchanged for establishing, releasing, and supervisory control of a circuit switched connection for voice / non-voice call in ISDN, which is performed as a call control function. If the call control function is responsible for the tasks to be handled inside the exchange, such as caller number analysis, outgoing line selection, and billing calculations related to call setup, the ISDN user unit 255 uses the processing result to set up and release the call. It manages the signal function for communicating with the switching center. That is, it mainly produces and transmits (or receives and analyzes) signal messages communicated between stations, various timer control functions related to transmitting and receiving signal messages, state conversion of call processing steps, and linkage with other signaling methods. Manage communication protocols.

The question-and-answer application unit 257 may query and change a control database according to a new service or an additional service using data in a service control node, for example, an application such as an incoming billing service and location registration in mobile communication such as a car, It specifies protocols with functions and versatility necessary for a wide range of applications that do not directly correspond to the control of communication lines between exchanges in communication networks and various special centers, such as transmission and reception of operation management data during operation management centers and exchange periods.

3 is a diagram illustrating a local processor state monitoring procedure of a message transfer unit level 3 according to an embodiment of the present invention.

First, when message transfer level 2 213 starts to operate, message transfer level 2 213 generates a task for monitoring the status of message transfer level 3 215. The message transmitter level 2 213 then transmits a message for monitoring to the message transmitter level 3 215. As the message forwarder level 2 213 delivers the message to the message forwarder level 3 215, the message forwarder level 3 215 receives the message and thus the message forwarder level. It sends an acknowledgment message to 2 (213). Therefore, the message transfer unit level 2 213 that receives the response message from the message transfer unit level 3 215 determines that the message transfer unit level 3 215 is in a normal state.

If the message transfer unit level 2 213 transmits the monitoring message to the message transfer unit level 3 215 and then a predetermined time, for example, 1.5 seconds, passes, the message transfer unit level 2 213 retransmits the message for monitoring to the message delivery unit level 3 (215). Then, the message transmitter level 2 213 counts the set time, and if there is no response after the set time has elapsed, retransmits the message for monitoring to the message transmitter level 3 215 again. . In this way, if the number of retransmissions of the monitoring message due to the non-response of the message delivery unit level 3 215 after the message for monitoring becomes a preset number of times, for example, three times or more, the message delivery unit level 2 213 The message transmitter level 3 215 recognizes the processor outage state due to a failure. Thus, the message forwarder level 2 213 sends a SIPO message to the power station to notify the message forwarder level 3 215 that a processor outage has occurred. The message transfer unit level 2 213 then performs the procedure according to the processor stop.

4 is a diagram illustrating a local processor state monitoring procedure of a message transfer unit level 3 according to an embodiment of the present invention.

First, the fault management block 400 implemented in the No. 7 signal system detects a processor outage state when a failure occurs in the message transfer unit level 3 215. In operation 411, the failure management block 400 that detects the processor stop state of the message transfer unit level 3 215 stops the processor in the message transfer unit level 3 215. Notify that the occurrence of the (step 413). Then, the message forwarder level 2 213 performs a procedure according to the processor stop of the message forwarder level 3 215. In addition, when the message delivery unit level 3 215 starts to operate, the message delivery unit level 3 215 performs a task for monitoring a state of an upper layer, that is, the level 4 250. Create The message transmitter level 3 215 then transmits a message for monitoring to the upper layer, that is, level 4 250 (step 415). As the message forwarder level 3 215 forwards the monitoring message to level 4 250, the level 4 250 receives the monitoring message and thus to the message forwarder level 3 215. In step 417, an acknowledgment message is transmitted. Therefore, the message transfer unit level 3 215 that receives the response message from the level 4 250 determines that the level 4 250 is in a normal state.

If the message transmitter level 3 215 transmits the message for monitoring to the level 4 250 and then a predetermined time, for example, 1.5 seconds, passes, the message transmitter level 3 215. Retransmits the message for monitoring to level 4 250. The message transfer unit level 3 215 then counts the set time, and if there is no response after the set time has elapsed, retransmits the message for monitoring to the level 4 250 again. As such, when the number of retransmissions of the monitoring message due to the non-response of the level 4 250 after the transmission of the message for monitoring becomes a preset number of times, for example, three times or more, the message transfer unit level 3 215 may be used. It is recognized that level 4 250 is in the processor outage state due to a failure. Thus, the message transfer unit level 3 215 sends a SIPO message to the power station to notify the level 4 250, i.e., the upper layer, that a processor outage has occurred. The message transfer level 3 215 then performs the procedure according to the processor hang. That is, the message transfer unit level 3 215 notifies the message transfer unit level 2 213 of the processor stop state of the upper layer, that is, the level 4 250 (step 419). At the same time, the message transfer unit level 3 215 notifies the failure management block 400 that the processor stop has occurred in step 411.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above has the advantage that it is possible to monitor the processor outage status of the message delivery unit level 3 at the message delivery unit level 2 of the No. 7 signal system. Thus, it has the advantage of eliminating a state where it is impossible to monitor the processor quiescent state due to the failure of the message delivery unit level 3. It also has the advantage that it is possible to monitor the processor quiescent state of the upper layer at the message transfer level 3 so that it is possible to accurately monitor the cause of the processor quiescent state.

Claims (15)

7. A method for monitoring a processor state of a signal system comprising: a message transfer unit for transmitting a signal message, and a user unit for performing a communication service; Transmitting a message for monitoring to the message transfer unit; Checking whether a response message to the monitoring message is received within a preset time period from the message transmission unit after transmitting the message; 7. The processor state monitoring method of claim 7, wherein the response message is received within the set time. The method of claim 1, Periodically transmitting the monitoring message for a predetermined number of times to the message transfer unit when the response message is not received within the set time; 7. When the response message is received from the message transfer unit during the periodic transmission process, further comprising the step of determining the message transfer unit to the normal state. The method of claim 2, 7. When the response message is not received from the message transfer unit during the periodic transmission process, further comprising the step of determining the message transfer unit to the processor stop state. The method of claim 3, 7. The method of claim 7, wherein the message delivery unit comprises a message delivery unit level 1, a message delivery unit level 2, and a message delivery unit level 3. The method of claim 4, wherein And when the message transfer unit having the processor stop occurs at the message transfer unit level 3, controlling the message transfer level 3 to notify the message transfer level 2 that the message transfer unit level 3 is in the processor stop state. No. 7 How to monitor the processor status of the signaling system. 7. A method for monitoring processor status of a signal system comprising: a message delivery unit level 2 for preventing transmission of a message and transmitting the message; and a message delivery unit level 3 for performing routing and maintenance functions for processing the message. , Transmitting a message for monitoring to the message transfer unit level 3; Checking whether a response message to the monitoring message is received within a preset time period from the message transfer unit level 3 after transmitting the message; 7. When the response message is received within the set time, determining the level 3 of the message transfer unit as a normal state. The method of claim 6, Periodically transmitting the monitoring message to the message transfer unit level 3 periodically for a set number of times when the response message is not received within the set time; 7. When the response message is received from the message transfer unit level 3 during the periodic transmission process, further comprising the step of determining the message transfer unit level 3 to the normal state. The method of claim 7, wherein 7. When the response message is not received from the message transfer unit level 3 during the periodic transmission process, determining the message transfer unit level 3 as the processor stop state. Way. The method of claim 8, 7. The processor state monitoring method according to claim 7, further comprising the step of performing a processor stop procedure when the message transfer unit level 3 is in the processor stop state. The method of claim 9, And the processor stop procedure transmits a link state signal unit indicating the processor stop to an adjacent signal point and discards all received messages. A message transfer unit level 2 that prevents and transmits a message transmission error, a message transfer unit level 3 that performs routing and maintenance functions for processing the message, and a fault that is executed when the operation of the message transfer unit level 2 starts. A processor state monitoring method for a No. 7 signaling system comprising a management block, The fault management block transmits a message for monitoring to the message transfer unit level 3 as the message transfer unit level 2 is started; Checking whether a response message to the monitoring message is received within a preset time period from the message transfer unit level 3 after transmitting the message; 7. When the response message is received within the set time, the message transfer unit level 3 is determined to be in a normal state. How to monitor processor status in signaling systems. The method of claim 11, Periodically transmitting the monitoring message to the message transfer unit level 3 periodically for a set number of times when the response message is not received within the set time; Determining that the message transfer unit is in a normal state when the response message is received from the message transfer unit level 3 during the periodic transmission process, and notifying the message transfer unit level 2 that the message transfer unit level 3 is in a normal state. 7. A processor status monitoring method for a signal system. The method of claim 12, If a response message is not received from the message delivery unit level 3 during the periodic transmission process, the message delivery unit level 3 is determined to be the processor stop state, and the message delivery unit level 3 is the processor delivery state. 7. A method for monitoring processor status in a signal system, further comprising the step of informing. The method of claim 13, 7. The message delivery unit level 2 notified that the message delivery unit level 3 is in a processor stop state further comprises performing a processor stop procedure. The method of claim 14, And the processor stop procedure transmits a link state signal unit indicating the processor stop to an adjacent signal point and discards all received messages.