KR20050088505A - Method for distributing load in no.7 protocol equipment - Google Patents

Abstract

The present invention relates to a method for processing a message according to a connection-oriented attribute in a distributed processing system in which a plurality of number 7 modules and a plurality of applications are connected in a multiplexed manner. Checking whether the message is the first message for a connection; if the message is the first message, selecting a predetermined application according to a load balancing rule; and receiving the message from an ISDN user part (ISP) or a broadband inter-carrier interface (BICI). Checking whether the message is related to the message; if the message is not related to the ISUP or BICI message; delivering the received message to the selected application; And setting the upper first octet as identification information of the application.

Description

Distributed processing method in No.7 protocol equipment {METHOD FOR DISTRIBUTING LOAD IN NO.7 PROTOCOL EQUIPMENT}

The present invention relates to a distributed processing method in No. 7 protocol equipment, and more particularly, to a method for processing a message by connection-oriented attributes in a distributed processing environment.

In general, No.7 signaling, a common channel signaling (CCS) standardized by the International Telecommunication Standardization Division (ITU-T) of the International Telecommunication Union, provides call connection between subscribers and various communication services, Signaling method for transmitting various control signals for operation management.

In public switched telephone network (PSTN), signaling message exchange is made through No.7. This No. 7 uses ITU-T Recommendations Q.704 MTP-3, Q.2210 MTP-3b and SCCPs of Q.711 to 714 as shown in FIG.

1 shows a general No. 7 protocol structure. In the figure, the right side shows a protocol structure when using an ATM (Asynchronous Transfer Mode) based network, and the left side shows a structure when using a STM (Synchronous Transfer Mode) based network.

First, referring to the ATM-based protocol structure, layer 1 is composed of ATM layer 101. Layer 2 consists of a Service Specific Coordination Oriented Protocol (SSCOP) 102 and a Service Specific Coordination Function (SSCF) 103. Layer 3 is composed of MTP-3b (Message Transfer Part-3b) 106, Layers 4 to 6 are composed of Signaling Connection Control Part (SCCP) 107, and Layer 7 is an application part ( Application Part) 108-113.

Next, looking at the STM-based protocol structure, layer 1 is composed of MTP-1 (Message Transfer Part-1) 104, layer 2 is composed of MTP-2 (Message Transfer Part-2) 105 Layer 3 is composed of MTP-3 (Message Transfer Part-3) 106, Layers 4 through 6 are composed of signaling connection control part (SCCP) 107, and Layer 7 is an application part. (Application Part) 108-113.

On the other hand, the application unit (AP), as shown, RANAP (Radio Access Network Application Part) 108, Transaction Capabilities Application Part (TCAP) 109, Access Link Control Application Protocol (ALCAP) 110, ISUP (ISDN User part) 111, BICI / BISUP (broadband inter-carrier interface / broadband ISDN User part) 112, BICI 113 and the like.

The No. 7 protocol stack as described above is difficult to configure as an independent module as the network becomes larger and the performance of the required signaling message increases. Therefore, in order to efficiently process, as shown in Figure 5 is implemented in a distributed form. As shown, each layer in a distributed structure is composed of a plurality of entities to share the role of each layer.

However, when implementing a distributed structure as shown in FIG. 5, a connection-oriented attribute of a higher application message should be considered. In order to satisfy the connection-oriented nature of application messages, there must be consideration of subsequent messages for one connection, and there must be a way to process subsequent messages for connections managed by one application in a distributed environment. do.

2 shows the flow of consecutive messages for one connection. 2 shows an example of an ISDN (ISDN User Part) message.

As shown, when Node A sends an Initial Address Message (IAM), Node B responds to the Initial Address Message to the Node A in response to an Address Complete Message (ACM) and a Response Message (ACM). ANM: Send Answer Message). Meanwhile, when Node A transmits a Release Message (REL), Node B transmits a Release Complete Message (RLC) to the Node A in response to the Release message.

As such, it shows a continuous message flow for one connection. Therefore, when there are a plurality of entities in each layer, a method for processing a subsequent message for one connection is needed to satisfy the connection-oriented attribute of the application message.

Accordingly, an object of the present invention is to provide a method for processing a message based on a connection-oriented attribute in a system in which a plurality of No. 7 modules and a plurality of applications are connected by multiplexing.

In a distributed processing system in which a plurality of number 7 modules and a plurality of applications are multiplexed to achieve the above object, there is a method for processing a message according to a connection-oriented attribute. The process of checking whether the message is the first message for the connection, the process of selecting a predetermined application according to a load balancing rule in the case of the first message, and the received message is an ISDN user part (ISP) or a broadband inter-carrier interface. ) Checking whether the message is related to the message, transmitting the received message to the selected application if the message is not related to the ISUP or BICI, and receiving the message from the number 7 module. And setting the upper one octet of the identification information of the application. The.

Preferably, in the case of the ISUP or BICI related message, obtaining CIC (Circuit Identification Code) information from the received message, and storing the CIC information and the identification information of the selected application in a routing table, and The method may further include delivering the received message to the selected application.

Preferably, if the message is not the first message, checking whether the received message is an ISUP or BICI related message, and if it is not the ISUP or BICI related message, decoding the connection delimiter of the received message to identify the application. Acquiring information, delivering the received message to an application corresponding to the acquired identification information, and in case of the ISUP or BICI related message, acquiring CIC information from the received message and having the CIC information. And accessing the routing table to read application identification information, and transmitting the received message to an application corresponding to the read identification information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described a method for processing an application message based on a connection-oriented attribute in a system in which a plurality of No. 7 modules and a plurality of applications are connected in multiplex.

In order to satisfy the connection-oriented attribute, the following method can be assumed.

First, all applications share the database by managing connection-related duplicate databases in the application.

Second, in the No.7 module (MTP-3, MTP3b, SCCP) to distribute subsequent messages for the connection to the appropriate upper application.

Comparing the above two methods is shown in Table 1 below.

Connection database management Distribution in No7 Module Ease of Application Implementation Simple child No7 block does not need to consider the parent and only the data management part is complicated Somewhat complicated Overhead This overhead increases as the number of rapidly changing connection-related information deduplication applications grows. The information management need to store information about the application that handles the call is operated independently for each No.7 block. Processing performance Performance degradation due to data redundancy height

As shown in Table 1, the distribution scheme in the No7 module is somewhat complicated in terms of application implementation, but the processing performance is high.

FIG. 3 is a diagram for describing a connection table redundancy management scheme in an application, and FIG. 4 is a diagram for explaining a routing information storage scheme in a No7 module.

Hereinafter, the present invention will be described with respect to a message transfer method between a multiplexed No. 7 module and an upper application using a routing information storage method in the No. 7 module without the need for data duplication.

5 illustrates a protocol structure in which a plurality of No. 7 modules and a plurality of applications according to the present invention are connected by multiplexing.

As shown, the No. 7 protocol structure can be largely divided into four layers except for the physical layer (layer 1). Corresponds to Layer 2 501 corresponding to Layer 2 of OSI, MTP-3 502 corresponding to Layer 3 of OSI, SCCP 503 corresponding to Layer 4-6 of OSI, and Layer 7 of OSI. It consists of an application 504. Each layer is composed of three entities as an example, and the layers are connected in a multiplexed form.

Looking at the function of each layer, the layer 2 (501) performs the operation according to the message classification, flow control, sequence number check, error check and error paper retransmission. The MTP-3 502 performs destination determination, routing, message distribution, and the like. The SCCP 503 transmits circuit related information between special facilities of a network, and provides a connected and disconnected network service of a higher layer. On the other hand, the application 504 is a layer that provides the actual service, as described above, Radio Access Network Application Part (RANAP), Transaction Capabilities Application Part (TCAP), Access Link Control Application Protocol (ALCAP), ISDN User part), BICI / BISUP (broadband inter-carrier interface / broadband ISDN user part), and BICI.

Each of these upper applications (RANAP, TCAP, ALCAP, ISUP, BISUP / BICI, BICI) has a connection-oriented attribute, and the No. 7 module processes a message based on the connection-oriented attribute.

The characteristics of each application protocol are summarized in Table 2 below.

RANAP TCAP ALCAP ISUP BISUP / BICI BICI Service provider SCCP SCCP MTP-3b MTP3 MTP-3b BearerIndependent characteristic SCCPconnection-oriented SCCPconnectionless MTP-3bUser Data MTP-3User Data MTP-3bUser Data MTP-3bUser Data Connection Classification Parameter SCCPReferenceNumber Transaction ID of TCAP SignalingAssociationIdentifier CIC SignalingIdentifier CIC Connection Separation Length 4 Octec 4 Octec 4 Octec 14 bit 4 Octec 2 Octec

As shown in Table 2, in each of the higher application protocols, a field (connection separator) exists to distinguish a connection. Based on these connection identifiers, subsequent messages for one connection in each protocol are determined.

In the present invention, the No. 7 module selects an application based on the load balancing principle when the message is the first message for a connection, and delivers subsequent messages to the application that processes the connection.

To this end, the present invention uses the following connection classification factors for each application protocol.

RANAP: Uses the upper one octet of the "Source Local Reference" field of the SCCP as the application identification information.

TCAP: Uses the upper one octet of the "Originating transaction ID" field of the TCAP as the application identification information.

ALCAP: The upper 1 octet of the "Originating Signaling Association Identifier" field of ALCAP is used as the application identification information.

BISUP / BICI: Uses the upper one octet of the "Originating Signaling Identifier" field of BISUP / BICI as application identification information.

ISUP / BICI: In the case of ISUP / BICI, CIC (Circuit Identification Code) should be assigned to the same value between the own station and the other station. Therefore, in this case, the No.7 module should record the application information for the CIC in a table and use it for the subsequent message delivery.

Looking at the operation of the present invention based on the above description as follows.

FIG. 6 is a flowchart illustrating a procedure for delivering a message to an application by a No. 7 module in a system in which a plurality of No. 7 modules and a plurality of applications are connected to each other according to an embodiment of the present invention.

Referring to FIG. 6, first, in step 601, the No. 7 modules MTP3, MTP-3b, and SCCP check whether a message is received from a partner node. If message reception is not detected, the No. 7 module proceeds to step 621 to perform a corresponding function. If message reception is detected, the No. 7 module analyzes the message received in step 603 and determines whether the message is the first message for the connection in step 605.

If it is the first message for the connection, the No. 7 module proceeds to step 607 to select a predetermined application based on the load balancing principle. In step 609, the No. 7 module checks whether the message corresponds to an ISUP or BICI application protocol.

If the message is based on ISUP or BICI, the No. 7 module proceeds to step 611 to obtain CIC information from the received message, and stores the CIC information and the identification information of the selected application in a routing table. do. In step 613, the module No. 7 stores the received message as the selected application.

If it is determined in step 609 that the received message is not a message according to ISUP or BICI, the module No. 7 transfers the received message to the selected application in step 613. At this time, when the application receives the message, the upper one octet of the connection delimiter is set as its identification information and used in subsequent messages.

On the other hand, if it is determined in step 605 that the received message is not the first message for the connection, the No. 7 module proceeds to step 615 to determine whether the received message is a message according to ISUP or BICI. If it is determined that the received message is a message according to ISUP or BICI, the No. 7 module acquires CIC information from the received message in step 617, accesses the routing table with the CIC information, and then accesses the routing table. Read the identification information. In step 613, the module No. 7 transfers the received message to an application corresponding to the read identification information.

If it is determined in step 165 that the received message is a message according to ISUP or BICI, the module No. 7 proceeds to step 619 to decode the connection identifier of the received message to identify application ID information of the upper one octec. Acquire. In step 613, the module No. 7 transfers the received message to an application corresponding to the obtained identification information.

On the other hand, in the case of generating a connection first message internally, when the first message occurs, the application selects the No. 7 module by the load balancing principle, and transmits a subsequent message to the same No. 7 module. At this time, the application sets the upper 1 octec of the connection identifier in the first message as its identification information. Therefore, when a message corresponding to the first message is received, the No. 7 module may decode the connection delimiter and transmit the received message to the application that generated the first message.

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 determined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention has been described with respect to the message distribution method for each application protocol when the upper application using the MTP-3, MTP-3b, SCCP protocol layer of No7 performs distributed processing. When the processing capacity of the signal message is large, when performing distributed processing based on this scheme, there is a point that the load of the application can be distributed to multiple entities with minimal overhead.

1 is a diagram showing a general No. 7 protocol structure.

2 shows the flow of consecutive messages for one connection.

3 is a view for explaining a connection table redundancy management scheme in an application.

4 is a view for explaining a routing information storage method in the No. 7 module.

5 is a diagram illustrating a protocol structure in which a plurality of No. 7 modules and a plurality of applications are connected by multiplexing according to the present invention.

FIG. 6 is a diagram illustrating a procedure for delivering a message to an application by a No. 7 module in a system in which a plurality of No. 7 modules and a plurality of applications are multiplexed according to an embodiment of the present invention. FIG.

Claims (4)

In a distributed processing system in which a plurality of number 7 modules and a plurality of applications are connected in multiplex, a method for processing a message according to a connection-oriented attribute, When receiving a message, the number 7 module checks whether it is the first message for a connection, In the case of the first message, selecting a predetermined application based on a load balancing rule; Checking whether the received message is a message related to an ISDN user part (ISP) or a broadband inter-carrier interface (BICI); Delivering the received message to the selected application when the message is not related to the ISUP or BICI; And upon receiving the message from the number 7 module, setting, by the application, an upper one octet of a connection separator as identification information of the application. The method of claim 1, In the case of the ISUP or BICI related message, obtaining CIC (Circuit Identification Code) information from the received message, storing the CIC information and identification information of the selected application in a routing table; And forwarding the received message to the selected application. The method of claim 2, If it is not the first message, checking whether the received message is an ISUP or BICI related message; If it is not the ISUP or BICI related message, decoding the connection identifier of the received message to obtain application identification information, and delivering the received message to the application corresponding to the obtained identification information; In the case of the ISUP or BICI related message, CIC information is obtained from the received message, an application identification information is read by accessing the routing table with the CIC information, and the received message corresponds to the read identification information. The method further comprises the step of delivering to the application. The method of claim 1, When the first message for a connection is generated, the application selects a predetermined number 7 module according to a load balancing rule and delivers the first message to the selected number 7 module; When the subsequent message for the connection is generated, transmitting the subsequent message to the selected number 7 module, The application is characterized in that when the message for the connection occurs, the upper one octet of the connection identifier is set as the identification information of the application.