KR100921900B1 - A routing system for internetworking between PSTN and IP network - Google Patents

Abstract

The present invention further implements the SIGTRAN protocol stack in addition to the SS7 protocol in the PSTN SCP, and configures a direct IP route set between the IP network SG and the PSTN SCP, thereby enabling direct access to the SCP from the SG of the IP network and also to the PSTN and IP networks. The present invention relates to a system capable of bypassing routing between networks even when a complex failure of an interworking network occurs. To this end, a routing system for interworking a PSTN and an IP network according to the present invention uses a SS7 protocol with a PSTN and a SIGTRAN protocol with an IP network to process a query and response message for a PSTN intelligent network service. Wow; When the SS7 protocol-based intelligent network service query message is received from the service exchanger, it is sent directly to the service controller using the primary route set. In case of failure of the primary route set, the secondary route set is used to pass through the IP network signaling gateway station. A signal repeater for transmitting to the service controller; And IP route set directly with the service controller, and when the intelligent network service query message is received from the media gateway controller of the IP network, the SIGTRAN protocol is transmitted to the service controller directly using the primary route set. It is characterized in that it comprises a signal gateway station for transmitting to the service controller via the PSTN signal repeater using a secondary route set in the SS7 protocol.

Description

A routing system for internetworking between PSTN and IP network}

1 is a diagram illustrating an example of a configuration diagram and protocol stack between a conventional PSTN and an IP network;

2 is a diagram illustrating an example of a configuration diagram and a protocol stack between a PSTN and an IP network according to the present invention;

3 is a routing diagram showing a process of transmitting a query message from the SSP of the PSTN to the SCP according to the present invention.

Figure 4 is a routing diagram showing the process of transmitting a query message to the SCP of the PSTN in the IP network MGC (GK) in accordance with the present invention.

5 to 7 is a diagram illustrating a routing configuration in which a PSTN and an IP network interwork according to the present invention when a complex failure of the PSTN is performed.

8 to 10 are diagrams illustrating a routing configuration in which a PSTN and an IP network interwork according to the present invention in case of complex failure of an IP network.

The present invention relates to a routing system for interworking a Public Switched Telephone Network (PSTN) and an Internet Protocol (IP) network. The present invention relates to a Signaling System No. 7 (SSGT) protocol of a Service Control Point (SCP). It is related to a routing system for interworking between PSTN and IP network by enabling the transport protocol protocol stack to directly access the SCP of PSTN from SG (Signal Gateway) of IP network.

The conventional interworking between the PSTN and the IP network uses the SS7 protocol.

1 illustrates an example of a configuration diagram and a protocol stack between a PSTN and an IP network conventionally proposed by an Internet Engineering Task Force (IETF) SIGTRAN Working Group.

When the network service call is delivered from the subscriber in the PSTN, the service switching point (SSP) 10 recognizes that the service is the intelligent network service from the number dialed by the subscriber and SSQ protocol based inquiry message (TCAP / SCCP / MTP3 / MTP2 / MTP1). ) And then send it to SCP (40 or 50) via STP (Signaling Transfer Point) 20 or 30, and the received SCP (40 or 50) sends a response message (TCAP) based on SS7 protocol. / SCCP / MTP3 / MTP2 / MTP1) is generated and sent to the SSP 10 via the STP 20 or 30.

On the other hand, when an intelligent network service call is transmitted from a subscriber in an IP network, the MGC (GK) (Media Gateway Controller (Gatekeeper): Media Gateway Control Station (Gatekeeper)) 80 recognizes that the number dialed by the subscriber is the intelligent network service of the PSTN. The SIGTRAN protocol-based query message (TCAP / SCCP / M3UA / SCTP / IP) is generated and transmitted to the SG 60 or 70. Upon receiving this, the SG 60 or 70 converts the received inquiry message into an SS7 protocol based inquiry message (TCAP / SCCP / MTP3 / MTP2 / MTP1) and then passes the SCP (40 or 50) via the STP 20 or 30. To send). SCP 40 or 50 then generates an SS7 protocol based response message (TCAP / SCCP / MTP3 / MTP2 / MTP1) and sends it to SG 60 or 70 via STP 20 or 30, 60 or 70 converts the received response message into a SIGTRAN protocol based response message (TCAP / SCCP / M3UA / SCTP / IP) and transmits it to the MGC (GK) 80.

However, as described above, the interworking between the PSTN and the IP network is SG (60 or 70) and STP (20 or 30) when the MGC (GK) 80 of the IP network queries the SCP (40 or 50) of the PSTN. Inquiry is via a number of systems, and in the case of SG (60 or 70), several protocol conversions (encapsulation and decapsulation between the SS7 protocol and the SIGTRAN protocol) are performed. In addition, there is a problem that it is difficult to guarantee the reliability when a complex failure occurs in the corresponding section over the PSTN and IP network.

An object of the present invention devised to solve the above problems is to implement an SIGTRAN protocol (TCAP / SCCP / M3UA / SCTP / IP) stack on SCP, configure an IP route set between IP network SG and PSTN SCP, and network-to-network routing method. In order to reduce the number of nodes and protocol conversions through the system, the SG of the IP network can directly access the SCP of the PSTN.                         

Another object of the present invention is to provide a reliable intelligent network service even when a complex failure occurs by configuring a bypass routing path in the interworking network between the PSTN and the IP network.

To this end, a routing system for interworking a PSTN and an IP network according to the present invention uses a SS7 protocol with a PSTN and a SIGTRAN protocol with an IP network to process a query and response message for a PSTN intelligent network service. Wow; When the SS7 protocol-based intelligent network service query message is received from the service exchanger, the SS7 route set, which is the primary route, is directly transmitted to the service controller. In case of failure of the SS7 route set, which is the primary route, the SS7 route set is used as the secondary route. A signal repeater for transmitting to a service controller via an IP network signaling gateway; And a service controller and an IP route set, and when an intelligent network service query message is received from the media gateway controller of the IP network, the SIGTRAN protocol is directly transmitted to the service controller using the IP route set, which is the primary route. In case of a root set failure, a signal gateway station is transmitted to a service controller via a PSTN signal relay using a SS7 route set which is a secondary route in the SS7 protocol.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows an example of an interworking configuration diagram and protocol stack between a PSTN and an IP network according to the present invention.

As shown, the protocol of SCP 140 or 150 according to the present invention adds the SIGTRAN protocol (TCAP / SCCP / M3UA / SCTP / IP) stack to the SS7 protocol (TCAP / SCCP / MTP3 / MTP2 / MTP1) stack. Is implemented. And using the SIGTRAN protocol of the SCP (140 or 150) SCP (140 or 150) and the SG (160 or 150) to perform direct message transmission between the SCP (140 or 150) and the SG (160 or 170) of the IP network. 170, an IP route set (a3 to a6 link set) is configured. The SCP 140 or 150 and the SG 160 or 170 exchange messages with each other using the SIGTRAN protocol and the IP route set (a3 to a6 link set).

Hereinafter, the routing method between the PSTN and the IP network by implementing such a configuration and protocol will be described in more detail.

3 is a routing diagram showing a process of transmitting a query message from the SSP 110 of the PSTN to the SCP (140 or 150).

When the network service call is delivered from the subscriber in the PSTN, the SSP 110 recognizes the intelligent network service from the number dialed by the subscriber and generates an SS7 protocol based inquiry message (TCAP / SCCP / MTP3 / MTP2 / MTP1) and then the STP (120). Or 130 via SCP 140 or 150, and the received SCP 140 or 150 generates an SS7 protocol based response message (TCAP / SCCP / MTP3 / MTP2 / MTP1) and then STP (120). Or 130 to SSP 110.

Meanwhile, a process of transmitting an inquiry message from the IP network MGC (GK) 180 to the SCP 140 or 150 of the PSTN is shown in FIG. 4.

When the network service call is delivered from the subscriber in the IP network, the MGC (GK) 180 recognizes that the subscriber dialed number is the intelligent network service of the PSTN, and sends a SIGTRAN protocol based inquiry message (TCAP / SCCP / M3UA / SCTP / IP). After creation, it is transmitted to SCP 140 or 150 via SG 160 or 170, and the received SCP 140 or 150 sends a response message (TCAP / SCCP / M3UA / SCTP / IP) based on SIGTRAN protocol. After generation, the data is transmitted to the MGC (GK) 180 via the SG 160 or 170. That is, the present invention is characterized in that the SG (160 or 170) of the IP network directly transmits and receives a message with the SCP (140 or 150) of the PSTN.

However, if a failure occurs in the PSTN or IP network in combination, the message cannot be transmitted as shown in FIG. 3 or 4.

For example, if a failure occurs in the primary route set (A3 to A6 link set) from STP 1 (120) and STP 2 (130) to SCP 1 (140) and SCP 2 (150), respectively, as shown in FIG. As described above, the message is sent by bypassing the IP network.

More specifically, when the SSP 110 generates an SS7 based query message and transmits it to the STP 120 or 130, the STP 120 or 130 receiving the STP 110 or the primary route set to the SCP 140 or 150 is received. The query message is transmitted to the SG 160 or 170 of the IP network through a bypass route set (D1 to D4 link set) capable of detecting a failure of the A3 to A6 link set and bypassing the IP network. Then, the SG 160 or 170 converts the received SS7 protocol based query message into a SIGTRAN protocol based query message and transmits it to the SCP 140 or 150 through the IP route set (a3 to a6 link set). Upon receiving the inquiry message, SCP (140 or 150) generates a response message based on the SIGTRAN protocol and transmits it to the SG (160 or 170), and the SG (160 or 170) sends the response message based on the SIGTRAN protocol to the SS7 protocol. After the conversion to the response message of the STP (120 or 130) via the SSP 110 to send a response message.

In case of failure of the STP 1 (120) and the A5 and A6 link sets, the STP 2 (130) and the A3 are routed by bypass to the SG (160 or 170) of the IP network through the STP 2 (130) as shown in FIG. In case of failure of the A4 link set, it is routed to the SG 160 or 170 of the IP network through the STP 1 120 as shown in FIG. 7.

On the other hand, if a failure occurs in the primary route set (a3 to a6 link set) from SG 1 160 and SG 2 170 to SCP 1 140 and SCP 2 150, respectively, as shown in FIG. 8. Similarly, the message is sent by bypassing the PSTN.

More specifically, when the MGC (GK) 180 generates a SIGTRAN-based query message and sends it to the SG (160 or 170), the SG (160 or 170) that receives it will go to SCP (140 or 150) 1 In order to detect the failure of the secondary route set (a3 to a6 link set) and convert the received query message into the SS7 protocol based query message in order to bypass the PSTN, the STP 120 through the bypass route set (D1 to D4 link set). Or 130) to SCP (140 or 150). Upon receiving the inquiry message, the SCP 140 or 150 generates an SS7 protocol-based response message and transmits the response message to the SG 160 or 170 via the STP 120 or 130, and the SG 160 or 170 sends the SS7. After converting the protocol-based response message to the SIGTRAN protocol-based response message, the response message is transmitted to the MGC (GK) 180.                     

In case of failure of the SG 1 (160) and the link set a5 and a6, the SG 2 (170) and the a3 and a route are bypassed through the SG 2 (170) to the STP (120 or 130) of the PSTN as shown in FIG. 9. When the a4 link set fails, it is routed by bypass to the STP 120 or 130 of the PSTN through the SG 1 160 as shown in FIG. 10.

As described above, the present invention implements the SIGTRAN protocol stack on the SCP and configures the IP network route set to directly access the SCP from the SG of the IP network, thereby improving service quality by reducing the number of route routes and protocol conversions of the system. In addition, even in the event of a complex failure of the PSTN and the IP network, the reliability of the PSTN and the IP network can be improved to provide stable intelligent network services.

Claims (4)

A service controller that implements the SIGTRAN protocol in addition to the SS7 protocol, processes the query and response message for the PSTN intelligent network service using the SS7 protocol with the PSTN and the SIGTRAN protocol with the IP network; A signal repeater of the PSTN communicating directly with the service controller using the SS7 protocol upon receiving the intelligent network service query message from the service exchange of the PSTN; And And a signal gateway station of the IP network configured to directly communicate with the service controller using the SIGTRAN protocol upon receiving the intelligent network service query message from the media gateway controller of the IP network. Routing system for interworking between the PSTN and the IP network, characterized in that. The method of claim 1, The signal repeater, When the SS7 protocol based intelligent network service query message is received from the service exchanger, the SS7 route set, which is the primary route connected to the service controller, is directly transmitted to the service controller. The SS7 route set, which is a secondary route connected to the signaling gateway station, is transmitted to the service controller via the IP network signaling gateway station, and upon receiving the SS7 protocol based intelligent network service query message from the signaling gateway station, A routing system for interworking with a PSTN and an IP network, which is directly transmitted to the service controller using an SS7 route set which is a primary route. The method of claim 2, The signal gateway station, When the SS7 protocol based query message is received from the signal relay, the query message is converted into the SIGTRAN protocol based query message and transmitted to the service controller, and when the SIGTRAN protocol based response message is received from the service controller. Routing system for interworking with the PSTN and IP network, characterized in that for converting the response message based on the SS7 protocol and transmitted to the signal repeater. The method of claim 1, The signal gateway station, Upon receiving the SIGTRAN-based intelligent network service query message from the media gateway controller, it directly transmits to the service controller using the IP route set, which is the primary route connected to the service controller, and the IP route set failure, which is the primary route. Converts the SIGTRAN-based query message to the SS7 protocol-based query message and transmits it to the service controller via the signal repeater using the SS7 route set which is a secondary route connected to the signal repeater. Routing system for interworking between PSTN and IP network.

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