KR20020086163A - Apparatus for the operation of multiple I-CSCFs in the IMT-2000 All-IP network - Google Patents

Abstract

PURPOSE: A multi-gateway device in a packet-based network of an advanced mobile communication system is provided to operate a plurality of I-CSCF(Interrogating-Call State Control Functions) for performing a gateway function of an all-IP network and suitably distribute and process visiting calls inputted from the outside. CONSTITUTION: A plurality of I-CSCFs(110-112) select and assign a corresponding S(Serving)-CSCF which controls a communication service of a terminal when the terminal is registered in a packet-based network, interrogate an HSS(Home Subscriber Server) about an incoming call of the terminal, and detect an address of the corresponding S-CSCF which controls the termination terminal. A plurality of I-CSCFs(110-112) relay an SIP(Session Initiation Protocol)-based request message or response message with an S-CSCF located in an other network or its network, and perform a firewall function as to all signaling paths inputted from external networks(300,400). A single NES(Network Entrance Server)(110) performs a routing function between a plurality of I-CSCFs(110-112) and the external networks(300,400), and distributes and routes a message traffic inputted from a random external network to a plurality of I-CSCFs(110-112).

Description

Apparatus for the operation of multiple I-CSCFs in the IMT-2000 All-IP network}

The present invention relates to a multi-gate operation apparatus in a packet-based network of a next-generation mobile communication system, and more particularly, to a packet-based all-IP that is to be introduced in the future in an asynchronous IMT-2000 communication system as a next-generation mobile communication system. In the network, a packet of a next-generation mobile communication system for appropriately distributing an incoming call from outside by operating a plurality of request call state control devices (I-CSCFs) serving as gateways of the all-IP network. The present invention relates to a multi-gate operation device in an infrastructure network.

In the future, when an IP Multimedia Subsystem (IMS), which is an All-IP domain, is introduced in an asynchronous IMT-2000 network as a next-generation mobile communication system, the subscriber of the All-IP service is E.164, which is an existing called telephone number. Uniform Resource Location (URL) address based on Session Initiation Protocol (SIP) that allows incoming calls in all-IP domains in addition to the MSISDN of the series is assigned. All communication can be performed based on the address.

Such an asynchronous IMT-2000 All-IP network 10 basically has an Interrogating Call State Control Function (I-CSCF) system 11 and a serving call state control system as shown in FIG. 1. CSCF (hereinafter referred to as S-CSCF) 12 and a Home Subscriber Server (hereinafter referred to as HSS) 13, which is configured and operated as described above, is an important node of the All-IP network 10. Referring to the function and role of the I-CSCF system 11 which is one of the following.

First, when a terminal registers with the All-IP network 10, it selects and allocates the corresponding S-CSCF system 12 to control the communication service of the terminal. Second, the HSS 13 is queried for the terminal incoming call to find the address of the corresponding S-CSCF 12 controlling the called terminal. Third, it relays a request message or response message based on SIP (SIP: Session Initiation Protocol) with the S-CSCF 12 in another network or its own network. Fourth, as a gateway to all signaling paths coming from the external network, it serves as a firewall to prevent any possible security incidents.

The last role of the above-described functions and roles of the I-CSCF system 11 is the firewall role, since the All-IP mobile communication network 10 is implemented on a packet-based network, that is, an Internet protocol-based network (IP network). This is a factor that must be considered because not only the internal network information may be leaked or lost upon intrusion, but also there is a possibility of threatening network operation and providing stable service as a service provider.

However, since the address of the I-CSCF node 11 as a gateway of all signaling paths coming from the external network should always be open to the outside, the contents of the I-CSCF system when the network operator adds or modifies the I-CSCF system as necessary. And the information is delivered to the external network in real time, there is a difficulty that must be updated immediately.

In addition, as described above, the I-CSCF system performs a significant function in the network, that is, the All-IP network, and at least one I-CSCF must exist in the network when estimating the amount of traffic to be handled by the system. If multiple I-CSCFs exist in this way, proper distributed routing of incoming traffic from external networks should be ensured and I-CSCF systems should be expanded as traffic increases. If multiple I-CSCF systems interoperate with each other, it is impossible to distribute the traffic properly. Therefore, traffic is concentrated on one I-CSCF node, which causes problems or difficult re-routing for maintenance. In addition, when the new I-CSCF system is expanded or the existing I-CSCF system is changed, the information must be updated in real time in the external network. There is.

The present invention has been made to solve the above problems, and its object is to provide a suitable distributed routing of traffic from an external network when installing multiple I-CSCF as a gateway to an All-IP network of an asynchronous IMT-2000 communication system. It ensures that traffic is distributed and eliminates the need to deliver or update the information and information to external networks in real time even when I-CSCF is expanded, modified, or changed due to traffic increase. It is an object of the present invention to provide a multi-gate operation apparatus in a packet-based network of a mobile communication system.

1 is a basic configuration diagram of an All-IP network as a packet-based network of an asynchronous IMT-2000 system.

2 is a block diagram of a multi-gate operation apparatus in a packet-based network of a next generation mobile communication system according to an embodiment of the present invention.

※ Explanation of code for main part of drawing

10,200: all-api network 11,110,111,112: request call state control device

12: Serving call state controller 13: Home subscriber server

120: network entrance server 300, 400: external network

In order to achieve the above object, the multi-gate operation apparatus in the packet-based network of the next generation mobile communication system according to the present invention includes a request call state control system (I-CSCF), a serving-CSCF system (S-CSCF), and the like. In a packet-based network of a next-generation mobile communication system having a home subscriber server (HSS) to provide a communication service based on a packet-based address, when a terminal registers with the packet-based network, Select and assign the corresponding S-CSCF system to be controlled, query the HSS for the terminal incoming call, find out the address of the corresponding S-CSCF controlling the called terminal, S in the other network or the network to which it belongs To relay SIP-based request messages or response messages with CSCF and act as a firewall for all signaling paths coming from external networks. At least one request call state control system (I-CSCF) installed according to the traffic size of the packet-based network; And a single network inlet server (NES) that performs a routing function between the request call state control system and an external network, and distributes and routes the message traffic from any external network to the one or more request call state control systems, respectively. It is configured by.

The network entry server monitors the system load of each request call state control system in real time and performs the distributed routing based on the magnitude of the real-time system load of each request call state control system according to the monitoring result; In addition, as another example of the distributed routing of the network inlet server, the traffic from the external network is sequentially distributed to each of the requested call state control systems.

The network entry server may change the header information of the distributed routed message, but the change of the header information becomes the target of the distributed routing using the address of the network entry server recorded in the header of the message. It is characterized in that the change to the address of the request call state control system, and between the network entry server and the request call state control system is characterized in that the transmission and reception of the message based on the SIP (SIP) protocol.

Hereinafter, a multi-gate operation apparatus in a packet-based network of a next generation mobile communication system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a multi-gate operation apparatus in a packet-based network of a next generation mobile communication system according to an embodiment of the present invention.

2, the multi-gate operation apparatus 100 of the present invention, which is provided as a gateway of the All-IP network 200 of the asynchronous IMT-2000 communication system, has the same function as the I-CSCF 11 shown in FIG. Performing a plurality of request call state control systems (I-CSCFs) 110, 111, ..., 112; And performing a routing function between the plurality of I-CSCFs 110-112 and the packet-based external networks 300 and 400 based on an SIP protocol, and receiving a message from any external network 300 or 400. The traffic is distributed and routed to the plurality of I-CSCFs 110-112, respectively, and the system load of each of the I-CSCFs 110-112 is monitored in real time, and the corresponding I-CSCFs 110, 111 according to the monitoring result. Or to perform distributed routing based on the magnitude of the real-time system load of 112, or to sequentially perform the plurality of I-CSCFs 110-112 according to a predetermined order, and to distribute the routed messages. A single network entry server (Network Ent) that transmits the information by changing its address recorded in the header of the message to the address of the corresponding I-CSCF (110, 111 or 112) that is the target of the distributed routing. rance Server: consists of 120 NES).

Referring to the configuration of FIG. 2 together with the operation thereof, the present invention operates the multiple I-CSCF systems 110-112 as described above in the All-IP network 200. The NES server 120 having a large-capacity routing function between the I-CSCF system 110-112 and the external network 300,400 without directly connecting the system 110-112 with the external network 300,400. ) And configured to interwork with the outside through this.

At this time, the NES server 120 located in the middle should be capable of large-capacity routing processing, and checks the system usage of each I-CSCF system 110-112 in real time in addition to the general routing function and accordingly the external network. Incoming traffic from (300,400) is properly distributed and routed to the corresponding I-CSCF (110,111 or 112).

In addition, the NES server 120 to change the header information of the SIP message, to distribute the routing of its own address information contained in the header of the message transmitted from the external network (300,400) based on its own address information Change or insert into the address of the corresponding I-CSCF system 110, 111 or 112, or insert the address information of the corresponding I-CSCF system 110, 111 or 112 into the relevant header field in addition to its own address information. Distributed routing is performed together, and the subsequent procedure is performed without any problem through the corresponding I-CSCF 110, 111 or 112 in the SIP message processing.

In the present invention as described above, the access point is always fixed as one address of the NES server 120 from the standpoint of the external network (300,400). This fact is very important. For example, if there are several access points of the All-IP network 200 or if the information of the access point is changed, this fact must be propagated and updated to all networks connected to the network 200. In the present invention, the packet-based address of the NES server 120 as the access point viewed from the external network 300, 400 is always fixed, and the plurality of I-CSCFs 110-112 at the rear end of the NES server 120 are fixed. , The addition, modification and / or deletion of the I_CSCF 110-112 is possible at any time without affecting the external network (300, 400, etc.).

As described above, according to the multi-gate operation apparatus in the packet-based network of the next generation mobile communication system according to the present invention, the traffic of the All-IP network of the asynchronous IMT-2000 communication system is increased to perform the gateway function of the network. If multiple I-CSCFs are installed, traffic is distributed by routing the incoming traffic from the external network to each I-CSCF appropriately to reduce the load, increase its reliability, and increase or modify the I-CSCF as the traffic increases. Changes also create the effect of eliminating the hassle of delivering or updating the information and information to external networks in real time.

Claims (7)

A next-generation mobile communication system that includes a request call state control system (I-CSCF), a serving-CSCF system (S-CSCF), and a home subscriber server (HSS) to provide communication services based on packet-based addresses. In packet-based networks, When the terminal registers with the packet-based network, the S-CSCF system which selects and allocates a corresponding S-CSCF system to control the communication service of the terminal, queries the HSS for the terminal incoming signal, and controls the called terminal. Firewall, as a gateway to all signaling paths from external networks, relaying SIP-based request or response messages to S-CSCFs in other networks or in its own network. At least one request call state control system (I-CSCF) installed according to the traffic size of the packet-based network to perform a role; And A single network inlet server (NES) performs a routing function between the request call state control system and the external network, and distributes and routes the message traffic from any external network to the one or more request call state control systems, respectively. Multiple gateway management device in a packet-based network of the next generation mobile communication system, characterized in that configured. The method of claim 1, And the network entrance server monitors the system load of each request call state control system in real time. The method of claim 1, And the network entrance server performs the distributed routing based on the magnitude of the real-time system load of each request call state control system. The method of claim 1, The distributed routing of the network entrance server is a multi-gateway management device in a packet-based network of the next generation mobile communication system, characterized in that is performed sequentially for each of the required call state control system. The method of claim 1, The network entrance server is a multi-gate operation apparatus in a packet-based network of the next generation mobile communication system, characterized in that for changing the header information for the distributed routed message. The method of claim 5, The change of the header information is a packet-based network of the next generation mobile communication system, wherein the address of the network entry server recorded in the header of the message is changed to the address of the request call state control system corresponding to the distributed routing. Multi-gate operating device The method according to any one of claims 1 to 6, The apparatus for multiple gateway operation in a packet-based network of a next generation mobile communication system, wherein the network entry server and the request call state control system transmit and receive a corresponding message based on an SIP protocol.