KR20030050677A - Method of Observing IP Route in 3G UMTS Network - Google Patents

Abstract

PURPOSE: An IP route monitoring method in an 3G UMTS(3rd Generation Universal Mobile Telecommunication System) network is provided to prevent a packet transmission processing delay and failure factor by periodically monitoring signals and traffic IP routes between an SGSN(Serving UMTS Support Node) and plural GGSNs(Gateway UMTS Support Node). CONSTITUTION: It is checked whether a monitor timer is released(S31). If the monitor timer is released, a ping message, by which whether an IP node is normal can be recognized with an IP address of the next hop router, is transmitted to a GGSN(S32). It is judged whether a response to the ping message has been received from the GGSN(S33). If the ping message has been received from the GGSN, a route monitor timer is reset(S34). If no response to the ping message is received from the ping message, a route is changed(S35) and data are transmitted through the changed route(S36).

Description

IP route monitoring method in 3G UMS networks {Method of Observing IP Route in 3G UMTS Network}

The present invention relates to an IP route monitoring method in a 3G UMTS network. In particular, the present invention relates to a method for delaying and failing a packet transmission process by periodically monitoring signal and traffic IP routes between an SGSN and a plurality of GGSNs in order to provide a fast packet service in a 3G UMTS network. The present invention relates to an IP route monitoring method in a 3G UMTS network to prevent a factor.

In general, in the 3G 3rd Generation Universal Mobile Telecommunication System (UMTS) network, as shown in FIG. 1, a serving UMTS support node (SGSN) 10, a gateway UMTS support node (GGSN) 20, etc., are provided for packet service. Network nodes exist. The SGSN 10 uses an IP (Internet Protocol) protocol, which is a backbone network, for transmission of signals and traffic with the GGSN 20. The SGSN 10 encapsulates signals and traffic with an IP protocol, and transmits the signals and traffic to a specific GGSN 20 among a plurality of GGSNs 20 with reference to IP route information set therein. The content of the IP routing information is as shown in FIG. 2, and the IP of the next hop router to pass through with the interface card of the SGSN 10 to be used for transmitting the IP packet to the corresponding destination. It consists of addresses, and there are two types of IP route information: static routes configured by the operator and dynamic routes configured by the IP routing protocol.

Among these, the dynamic route is created, deleted, and changed by IP routing protocols operating on each network node of 3G UMTS by exchanging information with each other, and according to different IP routing convergence times for each routing protocol. It is synchronized between nodes.

As described above, the SGSN 10 finds IP route information for transmitting signals and traffic to a specific GGSN 20, and then finds an interface to be used and transmits an IP packet through the interface. However, if the next hop router through which the IP packet passes through the interface is abnormal, the IP packet cannot be transmitted to the GGSN 20, and this IP route information becomes an abnormal IP route. Therefore, when the IP routing protocol of the SGSN 10 detects an abnormal IP route by exchanging routing information with other network nodes, the IP route information is changed to use another IP route, but IP route information between a plurality of network nodes. There is a problem in that it is necessary to continue using an abnormal IP route during this time because IP Routing Convergence time is required for synchronization.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned general problems, and an object thereof is to periodically monitor signal and traffic IP routes between SGSNs and multiple GGSNs in order to provide fast packet services in a 3G UMTS network, thereby delaying packet transmission processing. And failure factors.

1 is a diagram illustrating a configuration for IP route monitoring in a 3G UMTS network.

2 is a table showing IP route information.

3 is a flowchart illustrating a method for monitoring an IP route in a 3G UMTS network.

4 is a diagram showing a ping message structure in FIG.

* Description of the symbols for the main parts of the drawings *

10: Serving UMTS Support Node (SGSN)

20: Gateway UMTS Support Node (GGSN)

An IP route monitoring method in a 3G UMTS network of the present invention for achieving the above object includes the steps of: checking whether a watchdog timer is released; When the watchdog timer is released, transmitting a ping message to the GGSN to determine whether the IP node is normal to the IP address of the next hop router described in the IP route information; Determining whether a response to the ping message has been received; If it does not receive a response to the ping message, after changing the route, characterized in that it comprises the step of transmitting data to the changed route.

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

For every IP route information in the signaling and traffic access link monitoring function of SGSN 10 for signaling and traffic IP route monitoring between SGSN 10 and GGSN 20 for providing fast packet service in 3G UMTS network according to the present invention. Operate the watchdog timer. As soon as the watchdog timer is released, it sends a ping to the next hop router's IP address described in the IP route information to determine whether the IP node is healthy and waits for a response.

An IP route monitoring method in a 3G UMTS network according to an embodiment of the present invention will be described with reference to the flowchart of FIG. 3.

First, in the signaling and traffic access link monitoring function of the SGSN 10, a watchdog timer is operated for every IP route information, and it is checked whether the watchdog timer is released (step S31). If the watchdog timer is not released, the route being used is continued (step S37).

However, when the watchdog timer is released, a ping message for determining whether the IP node is normal to the IP address of the next hop router described in the IP route information is transmitted to the GGSN 20 (step S32).

At this time, as shown in Fig. 4, the ping message includes a type of 1 byte, a code of 1 byte, a check sum of 2 bytes, an ID of 2 bytes, It consists of a two-byte sequence number and optional data.

In general, when a ping request is transmitted as a type 8 to the GGSN 20, when there is a ping response, it has a value of type 0.

Thereafter, it is determined whether a response to the ping message is received from the GGSN 20 (step S33), and when the response to the ping message is received from the GGSN 20, the route monitoring timer is reset (step S34).

However, if the response to the ping message is not received from the GGSN 20, after changing the route (step S35), data is transmitted to the changed route (step S36).

Although the preferred embodiments of the present invention have been described in detail above, it will be understood by those skilled in the art that the present invention may be modified or modified in various ways. Therefore, changes of the embodiments of the present invention will not be able to escape the technical scope of the present invention.

As described above, the present invention has an effect of preventing the delay and failure of packet transmission by periodically monitoring signal and traffic IP routes between SGSN and multiple GGSNs to provide fast packet service in 3G UMTS networks.

Claims (3)

CLAIMS 1. A method for monitoring signaling and traffic access links between a Serving UMTS Support Node (SGSN) and a Gateway UMTS Support Node (GGSN), the method comprising: checking whether a watchdog timer is released; When the watchdog timer is released, transmitting a ping message to the GGSN to determine whether the IP node is normal to the IP address of the next hop router described in the IP route information; Determining whether a response to the ping message has been received; If the response to the ping message is not received, changing the route, and transmitting data to the changed route. The method of claim 1, In a step of determining whether or not a response to the ping message has been received, when receiving a response to the ping message from the GGSN, in the 3G UMS network, characterized in that it comprises the step of resetting the root watchdog timer IP Root Surveillance Method. The method of claim 1, The ping message includes a type of 1 byte, a code of 1 byte, a check sum of 2 bytes, an ID of 2 bytes, and a sequence number of 2 bytes. And IP data, including optional data.