KR20000020356A - Method for signal message routing through default route composition in common line signal network - Google Patents

Abstract

PURPOSE: A method for signal message routing through default route composition in a common line signal network is provided to process a signal message transmitted to an erased signal point through a default route by erasing unused signal points and composing the default route through a signal transfer point. CONSTITUTION: A method for signal message routing through default route composition in a common line signal network comprises the following steps. An unnecessary signal point is erased from a signal point table. A default route is composed to process a signal message transmitted to the unnecessary signal point. The signal message is routed through the default route in order to transmit the signal message transmitted to the unnecessary signal point to a destination.

Description

Signal Message Routing Method with Default Route Configuration in Common Line Signaling Network

The present invention relates to a signal message routing method in a common line signal network, and more particularly, to a signal message routing method for configuring a default route in a common line signal network and transmitting a signal message.

Conventionally, all signal points (signal link and signal route) of other stations related to the own station should be managed, and only in this case, transmission of the signal message was possible. Therefore, in the related art, when the signal point to be managed increases, the load of the system and the difficulty of signal point management are increased, and considerable effort is required for maintenance / repair according to the change of the power point. In particular, a link failure may cause congestion of another link, causing a decrease in stability of the common line (No7) signal network. In addition, the conventional GT (Global Title, Global Title Routing) function (message transmission unit function transmits a signal connection control unit message to a specific signal station, and the GT included in the signal connection control unit is translated therein to obtain a new address. Obtaining signal station signaling points increases the size of the message, and the new implementation of this function in the signaling network requires a significant cost and time investment.

Looking at the content of the prior art as described above in more detail.

Conventional signal point management and routing methods require a lot of investment for the management of signal points having low importance or low utilization rate as the number of signal points increases, and there are many disadvantages in terms of cost, performance, and operation.

The disadvantage of the prior art as described above is not a problem when the signal point is small. However, when the network grows and connects with other companies or international networks beyond the area of the company and is connected to the system, the number of signal points to be managed increases, which causes a problem of increasing the load of the signal network.

Currently, when the signal point related to the own station increases in the common line (No7) signal network, all the signal points are managed together regardless of the importance or utilization. As a result, signal point management becomes a cause of load weighting on the system side, and much attention is required for signal point management on the operating surface. As the signal point increases, it manages and processes the route to send one message, which increases the load of the common line (N7) signal network system, and increases the amount of status management messages of the link frequently transmitted and received. Greatly reduce the availability of the network. In particular, in case of a link failure, a new link congestion may be induced in the process of exchanging all signal points and status management messages of other stations, which may threaten the entire signal network.

Managing a large number of signal points by one node acts as a factor to greatly reduce the stability of the common line (No7) signal network. Cause.

In addition, the conventional GT function increases the length of a message by adding signal information, and for each signal message, an exchange period without a direct call line having no direct relationship with a signaling connection control part (SCCP) or a circuit connection process or Used to efficiently transmit signal information between the exchange and the database, and having to translate the GT from the source / destination address), it causes an increase in the load on the common line (No7) signal network system. There was a problem in that it is difficult to apply to an unimplemented network. This will be described in detail with reference to FIG. 1.

1 is an example of a process of implementing a conventional global title (GT) function.

First, when the originating signal station wants to send a signal message to a signal point (PC) that is unknown to itself, it transmits this signal message to the signal point 'da' with the GT translation function along with the GT information. do. Since the signal point (PC) 'da' has received a signal message with its own signal point, sending it to the signal connection control unit (SCCP), the signal connection control unit (SCCP) assigns a new destination address through the GT translation and signals it. Sends a message to the message delivery unit (MTP) for transmission to the point d.

On the other hand, it is disadvantageous in terms of cost and performance to give a GT function to a network to which the GT function is not applied. The signal message to use the GT function is not generated much, but it takes a lot of time and cost to implement the GT function at each node of the network for this function, and its utility is low. In terms of performance, the length of the message and the need to perform GT translation adversely affect the availability of the link or the performance of the common line (No7) signaling network system.

The present invention devised to solve the above problems, the signal relay station (STP) to delete the signal points less used in the common line signal network and to process the default route (STP) that can be processed for the signal points that are not managed by the own station It is an object of the present invention to provide a signal message routing method for transmitting a signal message using the default route when transmitting a signal message to a signal point which is not managed by the local station.

1 is an exemplary view of a process of implementing a conventional GT (Global Title) function.

Figure 2 is a configuration diagram of an embodiment of a common line (No7) signal network to which the present invention is applied.

Figure 3 is an exemplary view of a functional interface of a common line (No7) signal network to which the present invention is applied.

4 is a diagram illustrating an embodiment of a signal message routing method through a default route configuration according to the present invention.

FIG. 5 is a flowchart illustrating a signal message routing method through a default route configuration according to the present invention. FIG.

6 is a flowchart illustrating an embodiment of receiving an SCCP status message according to the present invention.

* Explanation of symbols for the main parts of the drawings

21: service switching station (SSP) 22: signal relay station (STP)

23: service control station (SCP)

In order to achieve the above object, the present invention provides a signal message routing method applied to a common line signal network, comprising: a first step of deleting a signal point from a signal point table that a station does not need to directly manage; A second step of using a signal relay station (STP) to configure a default route capable of processing a signal message requiring transmission to a signal point not managed by the own station; A third step of transmitting, by the signal connection control unit, a signal message requiring transmission to a signal point not included in its signal point table to the message transfer unit (MTP); And a fourth step of routing, by the message transfer unit (MTP), a signal message required to be transmitted to a signal point not included in its signaling point table to a corresponding link of the default route. It features.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a configuration diagram of an embodiment of a common line (No7) signal network to which the present invention is applied.

Common line (No7) signal network is generally a signal point (SP: signaling point) that has a unique signal point (PC: Point Code: unique signal station code for each signal station). : Node that has common line processing function. It is composed of exchange station, maintenance operation center, signal relay station, service control station, etc.).

In FIG. 2, a service switching station (SSP: service switching point: a switch that handles an intelligent network service request as well as a basic exchange processing and utilizes a service control station when necessary, for example, a mobile communication switch of a mobile communication, another local exchange, etc.) (21) Service relay station (STP: Signal Transfer Point (STP) to other nodes) (22), Service control station (SCP: Signal Control Point: Supplementary service, service request from service switching station with service logic necessary for intelligent network service control (E.g., home location register, visitor location register, etc.) 23 of the mobile communication are all one of the signal stations SP. These signal stations (SP) exist to provide a special service to the user, and sends and receives many signal messages as a means for providing a service.

For example, a mobile subscriber can make a call in a mobile communication such as a base station (BS), which functions as an interface between a wired network and a wireless section in a mobile communication, a switching center (MSC: Mobile Switching Center, CGS: Cellular). Gateway Switch: Exchange of information installed in the gateway station for connection between the mobile communication network and the third party's communication network), signaling relay station (STP), home location register (HLR), etc. Need.

Signal stations (SPs) each have a functional interface of a common line (No7) signal network system as shown in Fig. 3 to accurately deliver this signal message to the desired destination. Based on the functional interface of FIG. 3, a process of transmitting a signal message in a common line signal network (No7) will be described.

The main cause of the signaling message is the telephone user part (TUP: Telephone line setup for telephone use), the integrated information network (ISDN) user part (ISUP: ISDN user part: improved speed compared to existing phones) And provide additional services, subjects of signaling messages for call line setup and service use, and users with question-and-answer functions (Transaction Capablilties User: users who need to answer questions between network service control stations. Messages need to be sent).

Taking the example of a dual TC user, if the information that the TC user wants to generate occurs, it is made into data of a certain length according to a specified standard, and this data and the caller party address (CalleD party address) determine the destination node. It contains the necessary information and transmits a destination signal point, GT, and one or more combinations of Subsystem Numbers (SSNs) to the Signaling Connection Control Unit (SCCP).

When SCCP receives the user data and destination address, the destination signal point (DPC: Destination Point Code) is found in the signal point table of the signal connection controller. If there is a signal point defined by referring to whether it can be processed after reception and the condition is good, the destination address and calling party address (Calling Party Address) are included in the user data to determine the destination node. It consists of one or more combinations of signal points, GTs and subsystem numbers, and adds a message transfer part (MTP: Message Transfer Part: transmits a signal message delivered from a higher level to a counterpart signal station and copes with network and system failures). Will be delivered.

As described above, the SCCP periodically tests whether or not the subsystem status of the signal point in the signal connection controller signal point table is normal. When the state of the host is changed, the signal connection controller informs it of the signal point on the table. Therefore, when the number of destination signal points (DPCs) in the signal point table of the signal connection controller increases, it causes a lot of messages to inform the user of the status check and the state change, which reduces the availability of limited link resources and impairs the stability of the link. do.

The message transfer unit (MTP) carries this signal message to the actual common line (No7) signal network. In the MTP, a signaling route to which a signaling message is to be transmitted (Signalling Route) refers to a route between an originating signaling station and a terminating signaling station, and a set of signal routes is called a signaling route set. It will look in the table and send the message to a place where the signal link is in good condition. Like the Signal Connection Control Unit (SCCP), the Message Transfer Unit (MTP) periodically checks the status of the link and, if an error occurs, informs it of the surrounding signal points. This increases the number of signal points to be managed, thereby increasing the inefficiency of the link.

In Fig. 2, A is a slave, and the slave A is composed of signal points B and J and a signal route. At this time, A must manage all signal points and signal roots from B to J. However, assume that only C to G of these signal points are frequently used signal points, and that signal points B, H, I and J are rarely used.

In the prior art, this should be known to all signal points involved in the event of a link failure or other state change. In other words, when a problem occurs in signal point A, this fact should be known as all signal points of B to J related to signal point A.

4 is a diagram illustrating an example of a signal message routing method using a default route configuration according to the present invention.

In the present invention, a signal route that is not frequently used or is not important is deleted, and a default route that collects and processes messages destined for the deleted route is set. The default route is configured from the local station to the corresponding destination through the STP. One example is shown in FIG.

In the station A of FIG. 2, a default route is configured as a signal relay station STP, and B, H, and I delete signal points. Signals sent from station A to all signal points it does not know are transmitted through this default route. Receiving this message, the STP sends this message to the destination according to what has already been done.

Referring to Figure 4 in detail with respect to the transmission process of the signal message through the Default Route (Default Route) as follows.

4 shows a process of sending a signaling message from an originating signal station to an incoming signal station of the signaling point 'I'. The route from the originating signal station to the signaling point 'I' consists of a default route from the originating signal station to the signaling relay station (STP) of the signaling point 'A', and the signaling point ' 'Is composed of a route.

Since the originating signaling station does not have the signaling point 'I' in the signaling point table, it transmits the signaling message through the default route to the already configured signaling relay station (STP). In order to send a signaling message to the signal point 'I', the originating signal station indicates that the signal point information points to 'I'. Since the STP of the received signal message is not the destination signal point DPC of the received signal message, the STP routes the signal message to the signal point of 'I'.

In addition, the signal connection control unit (SCCP) exchanges status management messages, and the signal network standard No7, which has been improved at the signal station, is as follows.

1) Signal point control system (SCCP) signal point and subsystem management function

-When routing a message from the upper (MAP) to the lower (L3), it is delivered without discarding the message even if there is no signal point of the corresponding signal connection controller.

-Subsystem status messages from other stations (Subsystem Allowed (SSA): Notifies that the local subsystem is in a normal state, or Subsystem Prohibited (SSP: Subsystem Prohibited): Notifies the subsystem of its own station abnormal status) If the signal point of the signal connection control part that is not registered in the host

-Substation status test (SST: Subsystem Status Test) message is received from other station that does not have signal point information of signal connection control part in its own station and sends its own status message (SSA or SSP).

2) Default Route Management of L3

-When routing a message from the upper level (SCCP) to a power station, if there is no power signal point, the message is sent to the default route.

3) It is possible to add, delete, and change the default route, and to temporarily turn on / off the default route function.

On the other hand, the summary of the process of receiving and processing the status message of the signal connection controller, as a result of receiving the status message of the signal connection controller with the default route function is activated, route information on this signal point is obtained. If not, the Subsystem Allowed (SSA) and Subsystem Prohibited (SSP) are discarded. In the case of Subsystem Health Test (SST), the Subsystem Allowed (SSA) or Subsystem Prohibited (SSP) is returned according to the status. do.

The process of transmitting a signal message by introducing the above new additional standard will be described with reference to the flowcharts of FIGS. 5 and 6 as follows.

5 is a flowchart illustrating a signal message routing method using a default route configuration according to the present invention.

First, a signal point that does not need to be directly managed is deleted, and a default route is configured by using a signal relay station (STP).

Subsequently, when the signal connection control unit (SCCP) receives the data and the signal point (51), it is determined whether the destination address exists in the signal connection control unit signal point table (52), and if it exists, it is determined whether the state of the subsystem is good ( 53) Otherwise, the message message is discarded (54) and if the subsystem state is good, the message is delivered to the MTP level (57).

On the other hand, if the destination address does not exist in the signal point control point signal point table (52), it is determined whether the default route function is activated (55) or otherwise the signal message is discarded (56). The message is delivered at the MTP level (57).

The MTP level then determines (58) whether the destination signal point (DPC) exists in the signal point table and if so, sends the message to the destination signal point normally (59). Determining whether the Default Route function is activated (60) or discarding the message (61), and if enabled, determining if the status of the Default Route is available (62) or otherwise discarding the message. (63) If available, the signal message is transmitted normally (64).

6 is a flowchart illustrating an embodiment of receiving an SCCP status message according to the present invention.

First, upon receiving a signal connection message state management message at a lower level (71), it is determined whether the source address exists in the signal connection table of the signal connection controller (72), and if present, processes in the existing manner (73). Determine if the Default Route function is active (74). If not, discard the message (75). If it is activated, determine the type of signal (76). A Subsystem Allow / Subsystem Inhibit (SSA / SSP) message is transmitted (77), and if it is a Subsystem Allow / Subsystem Inhibit (SSA / SSP), then the signal message is discarded (78).

On the other hand, the default route (Default Route) can be seen to perform a GT function in the sense that it transmits a signal message using a signal relay station (STP) even at a signal point it does not know. Here, the signal relay station (STP) becomes a system for performing GT translation. However, the length of the message is the same as before, and the GT translation is not actually performed, but only by routing the message delivery unit, there is no factor affecting performance.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above, when configuring the direct route (Route) at each signal point (MSC, CGS, HLR) at the time of international network interworking or other business interworking to increase the number of signal points hundreds of times when processing a common line (No7) message Unlike conventional methods that cause loads, link status messages significantly reduce the stability of the network, and require a lot of operational load, especially when working with the entire system for signal points that change frequently. Increasing the stability of the signal network, reducing the operational load, can be implemented in the node difficult to realize the GT function, and the performance is greatly improved.

In other words, the present invention can reduce the signal point management target by eliminating the exchange with large powers of low importance in case of an emergency or failure, and manage only the signal points of large power stations that have direct and frequent exchanges with their own countries, thus making signal point management more efficient and simpler. It can increase the stability of the network, which is the life of the common line (No7) signal network, make it easy to operate, and can greatly increase the capacity by reducing the load on the network and system side. In addition, the configuration of the default route has the effect of implementing the GT function without changing the size and performance of the message.

Claims (10)

In the signal message routing method applied to the common line signal network, A first step of deleting signal points from the signal point table that the own station does not need to directly manage; A second step of configuring a default route capable of processing a signal message requiring transmission to a signal point not managed by the own station; And A third step of routing a signal message through the default route so that a signal message requiring transmission to a signal point not included in the signal point table of the own station is delivered to a destination signal point; Message routing method through the default route configuration, including. The method of claim 1, The signal point table, Signal routing method through the default route configuration, characterized in that configured to delete, add, and change the default route as needed. The method according to claim 1 or 2, The function of routing a signal message through the default route (Default Route), Signal routing method through the default route configuration, characterized in that configured to be temporarily turned on / off as needed. In the signal message routing method applied to the common line signal network, A first step of deleting signal points from the signal point table that the own station does not need to directly manage; A second step of using a signal relay station (STP) to configure a default route capable of processing a signal message requiring transmission to a signal point not managed by the own station; A third step of transmitting, by the signal connection control unit, a signal message requiring transmission to a signal point not included in its signal point table to the message transfer unit (MTP); And A fourth step in which the message transfer unit (MTP) routes a signal message required to be transmitted to a signal point not included in its signaling point table to a corresponding link of the default route; Message routing method through the default route configuration, including. The method of claim 4, wherein The signal connection control unit, When receiving the SST message from the signal point without signal point information in the signal point table of the signal connection control unit, a status message (SSA or SSP) is returned according to its subsystem state, And receiving a subsystem status message (SSA, SSP) from a signal point having no signal point information in the signal point table of the signal connection controller, and discarding the signal message. The method according to claim 4 or 5, The signal point table, Signal routing method through the default route configuration, characterized in that configured to delete, add, and change the default route as needed. The method of claim 6, Routing function to the default route of the fourth step, Signal routing method through the default route configuration, characterized in that configured to be temporarily turned on / off as needed. The method according to claim 4 or 5, The third step, A fifth step of determining whether a destination address exists in the signal connection controller signal point table by the signal connection controller (SCCP) receiving the data and the signal point; As a result of the fifth step, if the destination address exists, the state of the subsystem is determined. If the state is not good, the signal message is discarded. If the state of the subsystem is good, the sixth is transmitted to the message transfer unit (MTP). step; And As a result of the determination of the fifth step, if the destination address does not exist, it is determined whether the default route function is activated, and if it is not activated, the signal message is discarded. 7th Step to Deliver to Message routing method through the default route configuration, including. The method according to claim 4 or 5, The fourth step, A message transfer unit (MTP) is a fifth step of determining whether a destination signal point (DPC) exists in the message transfer unit signal point table; A sixth step of determining whether the default route function is activated if the destination signal point exists, and transmitting a signal message to the destination signal point as a result of the determination of the fifth step; And As a result of the sixth step, if it is not activated, the signal message is discarded. If it is activated, the state of the default route is determined. If not, the signal message is discarded. 7 steps Message routing method through the default route configuration, including. In common line signal network system with large capacity processor, Deleting signal points from the signal point table that the local station does not need to manage directly; Configuring a default route capable of processing a signal message requiring transmission to a signal point not managed by the own station; And A function of routing a signal message through the default route so that a signal message requiring transmission to a signal point not included in the signal point table of the own station is delivered to a destination signal point. A computer-readable recording medium having recorded thereon a program for realizing this.