KR100254511B1 - Signal transfer system - Google Patents

Abstract

PURPOSE: A method for recovering a signaling network management function in a signaling transfer switching system is provided to restore a signaling network management function while executing normally executing level 2 and 3 signaling message processing functions, without stopping the whole system, in case that a fault is generated in the signaling network management function of an MTP(Message Transfer Part) level 3. CONSTITUTION: If a signaling network management block receives an operator's recovery command from an OMS(Operation and Management Subsystem) through a GTMU(Global Test and Maintenance Unit)(301), the signaling network management block initializes signaling network management data inputted from a database of the OMS(302), sets up all the signaling points of a signaling network as an available state(303) and transmits a signaling point restart beginning message to an SPRC(Signaling Point Restart Control) block(304). The SPRC block transmits the signaling point restart beginning message to an SCCU(Signaling Control Connection Unit)(305). The signaling network management block transmits a link state send request message to a level 2 unit(306). The level 2 unit transmits a link state to an SLAC(Signaling Link Activity Control) block(307). The SLAC block transmits a signaling link test start command to an SLTC(Signaling Link Test Control) block(308) and transits to an activity/recovery state(309). The SLTC block generates a signaling link test message and transmits it to a remote terminal(310).

Description

Signal Network Management Function Recovery Method of Signal Relay Switching System

The present invention relates to a method for restoring a signal network management function of a signal relay switching system that restores the signal network management function when a failure occurs in a signal network management function such as a common line signal relay switching system.

The common line (No. 7) signal relay switching system includes Q.700-704, a message transfer part (MTP) protocol recommended by the International Telecomunication Union (ITU-T), and a signal connection control unit ( Signaling Transfer Point (STP) that performs the functions of SCCP: Signaling Connection Control Part (QCP) protocols Q.711-714 and Q.716. Performs Level 2 and Level 3 and Level 4 functions of 7.

The level 3 signaling network management function in the signaling relay system handles the changes in the network situation in the signaling network to accurately update and maintain the routing data of its own station. It should be reported as a point to ensure that the routing of messages in the signaling network is successful.

Therefore, the level 3 signaling network management function in the signal relay switching system is a core function of the system. If a failure occurs in the signaling relay switching system, the system cannot reflect the change of the signaling network situation.

In addition, if the level 3 signaling network management function fails in the signal relay switching system, the routing data that is changed in the level 3 signaling message processing function cannot be updated, resulting in a routing error. You will not be able to perform normal functions.

If this happens, the entire system will fail. In order to recover the system, the system must be initialized using the signaling point restart function of the message transfer unit protocol, thereby causing a service interruption.

Accordingly, the present invention devised to solve the above problems, without interrupting the function of the entire system when the signal network management function of the message transfer unit level 3, such as the common line signal relay switching system occurs, It is an object of the present invention to provide a method for recovering a signal network management function that restores a signal network management function while normally performing a level 3 signal message processing function and a level 2 signal message processing function.

1 is a schematic illustration of a common line signal relay switching system to which the present invention is applied.

Figure 2 is an exemplary view showing the shape of the signal network using a common line signal relay switching system to which the present invention is applied.

3A to 3D are flowcharts of a signal network management function recovery method of a signal relay exchange system according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

110: Operation and Maintenance Subsystem 111: OMPM

112: OMSM 120: Subsystem Connection Subsystem

121: SMXHub [P] 122: SMXHub [S]

123, 141, 145: Highway Interface Unit

130: signal message processing subsystem

131: SMHM 132: level 3 unit

133: level 2 unit 134: code division multiplexing unit

140: system maintenance and signaling network management subsystem

142: GTMU 143: signal connection control unit

144: signal network management unit

In order to achieve the above object, the method of the present invention obtains information on a link state upon receiving a restore command from an operator, recovers the state of a signal link, and determines whether a signal point adjacent to an available signal link is accessible. Stage 1; A second step of setting a route to be available, acquiring a network management resource of a large country, and transmitting a transmission prohibition message for an inaccessible signal point of the own station if the adjacent signal point is accessible as a result of the determination in the first step; A third step of, if the adjacent signal point is inaccessible as a result of the determination of the first step, transmitting a transmission prohibition message for the unavailable signal point to the signal transmission points of all regions, and determining whether the available signal point is the signal transmission point; As a result of the determination in the third step, if the signal transfer point is transmitted, the transmission prohibition message for all newly accessible signal points is transmitted, the network management resource of the large station is obtained, and the transmission prohibition message for the signal point inaccessible from the own station is transmitted. A fourth step of transmitting; As a result of the determination in the third step, if the signal transmission point is not the transmission point, the state of the adjacent signal point and the route is set to be accessible, the network management resource of the large country is obtained, and the transmission prohibition message for the signal point inaccessible from the own station is transmitted. Characterized in that it comprises five steps.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to FIGS. 1 to 3D.

First, the contents to be recovered in the event of a failure in the signal network management function of the common line relay system are as follows.

(1) system shape

The configuration of the system is related to the maintenance, such as the status and the active status of the module / unit performing a protocol or maintenance function.

The system configuration has to be restored to various contents for each system, which is updated by requesting transmission of status to a unit or a module performing system maintenance function.

(2) shape of signal network

The shape of the signal network refers to the specification data of the signal relay exchange system, and refers to all data related to a set of signal links, signal links, signal points, and signal routes.

These data are stored in the database or file for each system, and the data can be reconstructed through the initialization of the signal network management function.

(3) State of signal link

The data on the status of the signal link allows the level 2 and level 3 signal message processing functions to be continuously performed even when the signal network management function is stopped. In order to recover the state of the signal link, a level 2 link search is requested to match the state according to the received result.

(4) state of signal point

The state of all adjacent signal points is matched using the state of the signal link reported at level 2. The status of all non-adjacent signaling points in the network is received as a response after sending the allow message for resuming traffic among all level 3 network management messages to report the status of all signaling points adjacent to the signaling point. Update using a message.

(5) Status of signal route

The status of the signal route is also matched using the response of the network management message received in response to the allow message upon resuming traffic.

(6) Level 3 routing data

If the signal network, signal link set, signal point, and signal route in the signal network all match, then the routing data is constructed using this data, and then transmitted to all level 3 signal message processing functions. Let's update.

In this case, if there is no change in the network before the restoration of the signaling network management function is completed, it will be updated with the same contents as the existing data.

On the other hand, if there is a change in the signal network, the changed new data will be generated and sent to the level 3 signal message processing function.

1 is a schematic exemplary view of a common line signal relay exchange system to which the present invention is applied.

As shown in the figure, the common line signal relay switching system includes an operation and management subsystem (OMS) 110, a subsystem interconnection subsystem (SIS) 120, and a signal. Signaling Message Handling Subsystem (SMHS) 130 and System Maintenance and Signaling Network Management Subsystem (SNGTMS) 140 are provided.

The operation and maintenance subsystem 110 performs the operation management of the signal relay switching system, processes the operator's command, manages the data necessary for the database, the Operation Management Primary Module (OMPM) 111 and the Operation Management Secondery OMSM. Module 112).

Subsystem connection subsystem 120 functions to deliver messages in the system at high speed, SMX Hub [P] (Signalling Message eXchange Hub [Primary]) 121, SMX Hub [S] (Signalling Message eXchange Hub [Secondery]). (122) and has a Highway InterFace Unit (HIFU) 123 that provides an interface with other subsystems in the system.

The Signaling Message Handling Module (SMHM) 131 of the signaling message subsystem 130 is no. 7 Message transfer unit Level 3 unit (L3U: Level 3 Unit) 132 for processing signal messages of level 3, No. 13 7 Level 2 unit (L2U: Level 2 Unit) 133, which performs the level 2 signal link function of the message transfer unit, and code division multiplex, which performs the function of multiplexing / demultiplexing and transmitting messages of the level 2 unit 133. A transmission unit (PCM UNIT: Pulse Code Modulation Unit) 134 is provided.

Signaling Network Global Test and Management Subsystem (SNGTMS) 140 is a highway interface unit (141, 145) for handling the interface with other subsystems in the system, the maintenance function for the system GTMU (Global Test and Maintenance Unit) 142, Signaling Connection Control Unit (SCCU) 143, which is responsible for the status management of the subsystem. 7 is provided with a signaling network management unit (SNMU) 144 that performs the level 3 signaling network management function of the message delivery unit.

On the other hand, the level 3 unit 132 is provided with a signal link state control function block (LSC: Link State Control), which is a function block for controlling the signal link state of No. 7 message transfer unit protocol level 2.

In addition, the signal network management unit 144 has a function of controlling a link availability control function (TLAC: Link Availability Control), which processes a function of controlling the activation of a signal link, to test whether the signal link is in service or not. Signaling Link Test Control Block (SLTC), Signal Routing Control Block (TSRC), which is responsible for controlling the status of signal routing Signaling link activity control block (LSAC), which sends a start message and transitions to an operation / recovery state, and a signaling traffic flow control function block (TSFC) that controls the flow of signal traffic. ), A signal network management function recovery block that restores the signal network management function without system initialization, and restarts the signal point. Signaling point restart control block (TPRC) is in charge.

2 is an exemplary view showing the shape of a signal network using a common line signal relay switch system to which the present invention is applied.

As shown in the figure, the signal network has a structure in which the common line signal relay systems 210 to 219 are connected like a net, and the common line signal relay system is also connected to the general exchangers 220 to 229. It is.

Solid lines in the figure represent common line signal links.

Now, the process of restoring the signal network management function of the signal portion of the shaded portion of the drawing briefly described as follows.

First, when a recovery procedure is initiated by an external operator's recovery command, signal network data for the entire area including the pair 1 relay switching system 210 or 211 of the area 1 is initialized.

Subsequently, as the recovery procedure progresses, the state of all the links connected to the signal relay switching system 210 of the shaded portion is restored, and the timer is driven to the signal relay switching systems 211 to 219 of all regions. Send allow message when signal point resumes.

Later, after the state of the signal points and routes of all regions have been restored, the state of the signal points of the shaded region is broadcasted and the restoration ends.

3A to 3D are flowcharts illustrating a signal network management function recovery method of a signal relay exchange system according to an embodiment of the present invention.

As shown in the figure, the signal network management function recovery method of the common line signal relay switching system, first, the signal network management function block of the signal network management unit receives the operator's recovery command from the operation and maintenance subsystem through the GTMU. (301).

The signal network management function block of the signal network management unit receives data from the database of the operation and maintenance subsystem upon receiving a restore command, performs initialization (302), and sets all signal points in the signal network to an available state. In operation 303, the signal point restart start message is transmitted to the signal point restart function block (304).

The signal point resume function block receives the signal point resume start message and transmits the signal point resume start message to the signal connection control unit (305).

Subsequently, the signaling network management function block sends 306 a message requesting that the link state be sent to the level 2 unit.

The Level 2 unit, upon receiving the link state transmission request message, sends a link status to the link operation control block as to whether the link is in service (307).

The link operation control block transitions to operation / recovery state (308) after sending a command to the signal link test control function block to start a test on the signal link upon receiving a response to the link availability state (308).

The signal link test control function block generates a signal link test message and transmits it to the power station (310).

When the signal link test control function block receives a response message from the power station (311), the link operation control block reports the success of the test for the signal link (312), and the link operation control block receiving the signal link test success report receives the signal. When the link service status message is transmitted to the signal link availability control function block (313), the signal link availability control function block receiving the signal link service status message cancels the unavailable state of the signal link (314).

The signal link availability control function block sends an available message to the signal routing control function block (315), and upon receipt of the available message, the signal routing control function sets the state of the signal link to available (316), and the available state is It is determined whether it is the first link (317).

As a result, if the available link is the first link, after canceling the unavailable state of the linkset state (318), the number of available links in the linkset is increased (319), and if the available link is not the first link, the link within the linkset is immediately The number of available links is increased (319).

Later, it is determined whether a signal point adjacent to the available signal link is accessible (320), if it is accessible, the route is available (321), and a transmission prohibition message for all newly accessible signal points is transmitted (322). (332) after driving the first timer indicating the time to wait to completely match the signal link state and the second timer indicating the time to receive the routing data from the other signal relay switching system and update the state of the network. When the first timer expires, the traffic resumption allowance message is transmitted to all signaling relay switching systems (333).

Subsequently, upon receiving all network management messages (334), all signaling relay switching systems process the network management messages received from all signaling relay switching systems to match the state of the signaling network (335).

Later, when the second timer expires, after configuring routing data of the own station to update the routing data of the routing function of the level 3 (336), the third time indicating the time waiting for the routing data to be updated in the level 3 signal message processing function The timer is driven (337), and when the third timer expires, it is terminated after transmitting (338) the transmission prohibition message for the signal point inaccessible from the local station.

On the other hand, as a result of determining whether a signal point adjacent to the available signal link is accessible, if not accessible, a transmission prohibition message for a signal point that is not available is transmitted to the signal points of all regions (323).

Subsequently, it is determined whether the available signal point is a signal transfer point (324), and if it is a signal transfer point, transmit a transfer prohibition message for all newly accessible signal points (325), and the state of the signal link is an adjacent signal point. Set to the resume start state (326), and after performing the resume for the adjacent signal point (327), and transmits a signal point resume permission message (328).

On the other hand, if it is not a signaling point, the neighboring signal point and its root state are set to be accessible (329), and after the neighboring signal point is accessible to the signal connection control unit (330), the transmission permission message is broadcast (331). ).

Later, after driving the first timer indicating the time to wait to completely match the signal link state and the second timer indicating the time to receive the routing data from another signal relay switching system and update the state of the network (332). When the first timer expires, the traffic resumption allowance message is transmitted to all signaling relay switching systems (333).

Subsequently, upon receiving all network management messages (334), all signaling relay switching systems process the network management messages received from all signaling relay switching systems to match the state of the signaling network (335).

Later, when the second timer expires, after configuring routing data of the own station to update the routing data of the routing function of the level 3 (336), the third time indicating the time waiting for the routing data to be updated in the level 3 signal message processing function The timer is driven (337), and when the third timer expires, it is terminated after transmitting (338) the transmission prohibition message for the signal point inaccessible from the local station.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings.

As described above, the present invention has an effect of providing a service without interruption by recovering the system without failing to the entire system when a failure occurs in the level 3 signal network management function of the common line message transfer unit.

Claims (5)

Receiving a recovery command from an operator, obtaining information about the link state, restoring the state of the signal link, and determining whether a signal point adjacent to the available signal link is accessible; A second step of setting a route to be available, acquiring a network management resource of a large country, and transmitting a transmission prohibition message for an inaccessible signal point of the own station if the adjacent signal point is accessible as a result of the determination in the first step; A third step of, if the adjacent signal point is inaccessible as a result of the determination of the first step, transmitting a transmission prohibition message for the unavailable signal point to the signal transmission points of all regions, and determining whether the available signal point is the signal transmission point; As a result of the determination in the third step, if the signal transfer point is transmitted, the transmission prohibition message for all newly accessible signal points is transmitted, the network management resource of the large station is obtained, and the transmission prohibition message for the signal point inaccessible from the own station is transmitted. A fourth step of transmitting; And As a result of the determination in the third step, if the signal transmission point is not the transmission point, the state of the adjacent signal point and the route is set to be accessible, the network management resource of the large country is obtained, and the transmission prohibition message for the signal point inaccessible from the own station is transmitted. 5 steps Signal network management function recovery method of the signal relay exchange system made, including. The method of claim 1, The first step is, The signal network management function block, in response to receiving a recovery command from an operator, initializing the signal network management data; A seventh step of setting all signal points in the signal network to an available state; An eighth step of obtaining information on the link state from the level 2 unit, and the signal link test control function block performing a test on the signal link; The signal link availability control function block receiving a signal link test success report, setting a state of a signal link to be available, and setting a link set state to be available; And 10th step of determining whether a signal point adjacent to an available signal link is accessible Signal network management function recovery method of the signal relay exchange system made, including. The method of claim 2, The second step, An eleventh step of making the route available if accessible; A twelfth step of transmitting a transfer prohibition message for all newly accessible signaling points; A thirteenth step of, after driving the first timer and the second timer, transmitting a restart message allowing traffic to all signaling relay switching systems; All signal relay switching system receives a network management message, the fourteenth step to match the state of the signal network; And Driving a third timer and broadcasting a transmission prohibition message for a signal point inaccessible from the own station when the third timer expires; Signal network management function recovery method of the signal relay exchange system made, including. The method according to any one of claims 1 to 3, The fourth step, A sixteenth step of transmitting a transfer prohibition message for all newly accessible signaling points; A seventeenth step of setting the state of the signal link to an adjacent signal point restart state; An eighteenth step of, after performing the resumption of the adjacent signaling point, transmitting a permission message to restart the signaling point; A 19th step of transmitting a traffic resumption allowance message to all signaling relay switching systems after driving the first timer and the second timer; All the signaling relay switching system receives the network management message to match the state of the signaling network; And A twenty-first step of driving a third timer and broadcasting a transmission prohibition message for a signal point inaccessible from the own station when the third timer expires; Signal network management function recovery method of the signal relay exchange system made, including. The method of claim 4, wherein The fifth step, A twenty-second step of setting a state of an adjacent signal point and its root as accessible; A twenty-third step of reporting a neighboring signal point accessibility to the signal connection control unit, then broadcasting a transfer permission message; A twenty-fourth step of sending a permission to restart traffic to all signaling relay switching system after driving the first timer and the second timer; A twenty-fifth step of receiving all network management messages to match the state of the signaling network; And Driving a third timer and broadcasting a transmission prohibition message for a signal point inaccessible from the own station when the third timer expires; Signal network management function recovery method of the signal relay exchange system made, including.