KR101017139B1 - Mobile telecommunication system and method thereof - Google Patents

Abstract

A mobile communication system and a communication method thereof are disclosed. According to an aspect of the present invention, there is provided a mobile communication system, comprising: a home agent for storing IP pool information, the mobile communication system supporting mobile IP or proxy mobile IP; And an external agent sharing at least one of IP pool information of the home agent, wherein the external agent processes an IP registration procedure for the home agent after allocating an IP to the connected mobile communication terminal. do. As a result, it is recognized that the initial access time or the handover access time is shortened from the standpoint of the mobile communication terminal.

Mobile communication, mobile IP, proxy mobile IP, external agent, home agent

Description

Mobile telecommunication system and method thereof

The present invention relates to a mobile communication system and a communication method thereof, and more particularly, when a mobile communication terminal is used to access a mobile IP based network or a proxy mobile IP based network, the initial point of view of the mobile communication terminal. The present invention relates to a mobile communication system and a communication method thereof in which connection time or connection time due to handover can be shortened.

In recent years, IP (Internet Protocol) -based communication network has been rapidly developed due to the rapid development of Internet technology. In such an IP-based communication network, service data is transmitted and received using an assigned IP address.

Meanwhile, recently, a mobile communication system has been proposed to assign a network address system for transmitting data to a mobile communication terminal, that is, a mobile node. There is IP technology. The mobile IP technology manages the location of the mobile node as the number of users using the mobile node increases due to the rapid development of the mobile communication system and the increase in the wireless LAN service, and enables seamless communication even during hand-over. It is proposed to provide.

The mobile IP technology is being negotiated by the Internet Engineering Task Force (IETF), one of the standardization organizations. The mobile IP version has recently been proposed after the mobile IPv4. In other words, the IP-based communication network started based on IPv4, but has evolved to IPv6, which is a more advanced form in order to restrict IP resources, increase users, and provide various services. The biggest feature of IPv6 is that the IP address has been extended from 32 bits to 128 bits, extending the IP address to accommodate more subscribers.

However, in these over the mobile IP technology is mobile for use in a communication system protocol, and overhead (over head) has many problems of its own, the 3GPP2 (3 ^rd Generation Partnership Project2) one of the standardization organization of the recent mobile communication technology To reduce heads, we are proposing proxy mobile IP technology. The proxy mobile IP technology is currently in the process of defining standards, and various studies are being conducted to improve the performance of a mobile communication system using the proxy mobile IP.

Next, the initial access or handover process in mobile IP technology and proxy mobile IP technology will be described.

1 is a diagram illustrating a mobile IP access procedure in a wideband code division multiple access (WCDMA) network. Referring to the drawings, when the terminal 10 supported by the mobile IP is initially connected or handed over to the Serving GPRS Support Node (SGSN) 20, the terminal 10 is connected to the SGSN 20 and the new Gateway GPRS Support (GGSN). Node (30) is transmitted to the SGSN 20 to send a request signal (Activate PDP Context Request) (S101), after the SGSN 20 and the GGSN 30 is connected to each other according to the request signal (S102, S103, SGSN 20 transmits a response signal (Activate PDP Context Response) to the terminal 10 (S104). Here, PDP (Packet Data Protocol) is a network protocol used by an external packet data network for communication with a General Packet Radio Service (GPRS) network, and PDP context is a set of various types of information for connection to an external packet data network. It can be said. This provides a connection for transmitting and receiving packet data between the terminal and the network.

When the terminal 10 receives an activation signal from the SGSN 20, the terminal 10 requests an agent solicitation from the GGSN 30 (S105), and responds to the message with the GGSN. 30 requests agent advertisement (Agent Advertisement) from the terminal 10 (S106).

According to the agent advertisement request from the GGSN 30, the terminal 10 requests the mobile IP registration while delivering the mobile IP address information to the GGSN 30 (S107), and the GGSN 30 is received from the terminal 10. The mobile IP address information to the home agent (HA) 40 (S108).

The HA 40 requests access to the Authentication Authorization Accounting (AAA) 50 in response to the mobile IP registration request received from the GGSN 30 (S109), and the GGSN 30 according to the approval from the AAA 50. A response signal for the mobile IP registration request is transmitted to the terminal 10 through S110 to S112.

However, the mobile IP access in the WCDMA network as described above, since the terminal 10 requests the registration of the mobile IP, and finally receives a response signal, the terminal 10 authenticates the AAA 50. From the standpoint, there is a problem that the initial connection or handover time is delayed by that much.

2 is a diagram illustrating a proxy mobile IP access procedure in a WCDMA network. Here, the same components as those in FIG. 1 will be described with the same member numbers.

Referring to the drawings, when the terminal 60 supported by the proxy mobile IP is initially connected to or handed over to the SGSN 20, the terminal 60 connects to the SGSN 20 to connect the new GGSN 30 with the SGSN ( 20, a request signal (Activate PDP Context Request) is transmitted (S201), and the request signal is transmitted back to the GGSN 30 (S202).

In this case, unlike the case of the mobile IP technology, the proxy mobile IP technology supports the conventional simple IP or the proxy mobile IP on the terminal 10, and thus, directly between the GGSN 30 and the AAA 50. The authentication process is performed (S203, S204).

After the authentication process is performed, the GGSN 30 requests registration of the proxy mobile IP to the HA 40 (S205), and accordingly the response signal received from the HA 40 to the terminal 60 through the SGSN 20. (S206 to S208).

However, even in the proxy mobile IP connection in the WCDMA network as described above, after the GGSN 30 requests the HA 40 to register the proxy mobile IP, the AAA 50 is transmitted until the final response signal is transmitted to the terminal 60. Since the authentication process is performed in advance, there is a problem that the time of initial connection or handover is delayed by the terminal 10.

In the above description, the case of the WCDMA network has been described as an example, but not only the WCDMA network, but also a wireless local area network (WLAN) network, a wireless broadband network (WiBro) network, a code division multiple access (CDMA) network, and the like, are described with respect to AAA. Since it is common to assign an IP to the terminal after the authentication process, there is a problem that the initial access or handover time is delayed by the terminal.

The present invention has been made to solve the above problems, the mobile IP or proxy mobile IP supported terminal when the initial access or handover to the network, the initial access time or time of handover can be reduced It is an object to provide a communication system and a communication method thereof.

A mobile communication system according to the present invention for achieving the above object is a home agent (HA) for storing IP (Internet Protocol) pool information in a mobile communication system that supports Mobile IP (Internet Protocol) or Proxy Mobile IP. Home Agent); And

A foreign agent (FA) that shares at least one of the IP pool information of the home agent, wherein the foreign agent is assigned to the connected mobile communication terminal, the IP for the home agent It is characterized by processing the registration process.

Here, the external agent may be a gateway GPRS support node (GGSN) of a wideband code division multiple access (WCDMA) network, an access control router (ACR) of a wireless broadband network (WBro), and a PDSN (code division multiple access) of a CDMA network. Packet Data Serving Node).

In addition, the external agent preferably shares at least one of simple IP pool information and mobile IP pool information with the home agent.

Preferably, the mobile communication system further includes an authentication authorization accounting (AAA) for performing an authentication procedure in response to an access request signal received from the external agent or the home agent.

Here, it is preferable that each of the external agents used in different networks receives and stores IP pool information of different bands from the home agent.

On the other hand, the above mobile communication system, the communication method of a mobile communication system that supports a mobile IP or proxy mobile IP, the method comprising the steps of a mobile communication terminal accessing an external agent; In response to an IP registration request from the mobile communication terminal, assigning an IP from an IP pool shared by a home agent to a mobile agent and transmitting the IP to the mobile communication terminal; And AAA provides a communication method of the mobile communication system comprising the step of performing the approval procedure for the IP assigned to the mobile communication terminal.

The performing of the approval procedure may include: sending, by the foreign agent, an access request message to the AAA and receiving a response message corresponding thereto; And sending, by the foreign agent, an IP registration request message to the home agent based on a response message received from the AAA, and receiving a response message thereto.

Alternatively, the performing of the approval procedure may include: sending, by the external agent, an IP registration request message to the home agent; The home agent sending an access request message to the AAA and receiving a response message thereto; And sending, by the home agent, a response message to the IP registration request message to the external agent.

Here, when the approval for the IP assigned to the mobile communication terminal is rejected, it is preferable that the foreign agent terminates the call connected to the mobile communication terminal.

In addition, the foreign agent preferably includes at least one of a GGSN of a WCDMA network, an ACR of a WiBro network, and a PDSN of a CDMA network.

Here, it is preferable that each of the external agents used in different networks receives and stores IP pool information of different bands from the home agent.

In the mobile communication system and the communication method according to the present invention, when the terminal that supports the mobile IP or proxy mobile IP is initially connected or handed over to the network, by first assigning the IP to the terminal and processing the authorization procedure later, From the point of view of the terminal, the initial access time or handover time is felt to be shorter than in the related art.

Hereinafter, a mobile communication system and a communication method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram schematically illustrating a mobile communication system according to the present invention. Referring to the drawings, a mobile communication system according to the present invention includes a foreign agent (FA) 130, a home agent (HA) 140, and an AAA (Authentication, Authorization, Accounting) 150. Include.

Here, the external agent 130 is a router on the external network visited by the mobile communication terminal 110, reads the destination address from the received packet, designates the most appropriate communication path, and transmits it to another communication device. Do it. Such an external agent 130 is a Packet Data Serving Node (PDSN) of a Code Division Multiple Access (CDMA) network, a Gateway GPRS Support Node (GGSN) of a Wideband Code Division Multiple Access (WCDMA) network, and a Wireless Broadband Internet (WBro) network. It includes an access control router (ACR).

CDMA is a digital mobile communication method using spread-band technology developed by Qualcomm of the United States, also called code division multiple access. Since CDMA transmits and receives signals while sharing time and frequency, CDMA has more than 10 times the capacity and superior call quality than the existing analog mobile phone (AMPS). This CDMA method is one of the US standard technologies used in the digital automobile mobile phone using the spread spectrum technology, and the user distinguishes using a pseudo-noise (PN) code unique to the user communication channel.

WCDMA has several advantages over using the wideband CDMA as compared to the above CDMA scheme. First, the wider the bandwidth, the stronger the frequency selective fading, and in the case of transmitting the same data, the bandwidth is increased, thereby increasing the processing gain, thereby reducing the amount of interference and increasing the capacity. Second, since the multipath can be resolved using a RAKE receiver, even a micro cell can overcome propagation delay in an indoor environment. Third, the bandwidth efficiency per 1MHz bandwidth is excellent, which is advantageous in terms of subscriber capacity, and the processing gain is increased to reduce the power amplifier capacity, thereby reducing the cost of implementation, and by reducing the power amplifier size, the power consumption and size of the terminal are reduced. Can be.

WiBro is also known as Mobile WiMAX. WiBro is a wireless mobile Internet service developed by the Ministry of Information and Communication, the Korea Information and Communication Technology Association, and mobile telecommunications companies for commercial service purposes. Access to the Internet to access a variety of information and content. In other words, if a WiBro terminal such as a wireless LAN is installed in a personal computer, a notebook computer, a personal digital assistant (PDA), or a vehicle receiver, the Internet can be freely used in a moving car or a subway.

  The external agent 130 shares and stores at least one of IP pool information stored in the home agent (HA) 140. In order to access the Internet through the mobile communication terminal 110, the mobile communication terminal 110 should have an IP address like a computer. For this purpose, the external agent 130 may have IP pool information held by the home agent 140. Some of them are shared, stored, and managed to be assigned to the mobile communication terminal 110. Here, it is preferable that the external agent 130 for each network receives and stores different IP pool information from the home agent 140. For example, if the bandwidth of the IP pool stored in the home agent 140 is 10.1.1.1 to 10.1.10.256, the GGSN of the WCDMA network shares and stores 10.1.1.1 to 10.1.1.256, and the ACR of the WiBro network is 10.1. It is desirable to share .2.1 to 10.1.2.256. In this case, the external agent 130 may share and store at least one of simple IP pool information and mobile IP pool information stored by the home agent 140.

In the mobile communication service, a data service performed by the mobile communication terminal 110 is classified into a mobile IP data service and a simple IP data service. In the simple IP data service, a subscriber of the mobile communication terminal 110 may use one mobile communication. A simple IP address is allocated through a mobile communication packet network at a specific fixed location in the base station area so that a temporary IP address can be used to access the Internet or a private packet network. The simple IP data service is capable of transmitting and receiving data using a unique IP address by free movement within one mobile communication base station area. If the mobile communication terminal 110 moves to another base station area, Since no IP address handover is made, it is necessary to register a new IP address.

On the other hand, in the case of the mobile IP data service, the mobile communication terminal 110 sets a Point to Point Protocol (PPP) through the mobile communication packet network to use a preset IP address by itself, or gives an IP address from the mobile communication packet network. However, even when moving from one mobile communication base station area to another base station area, since the IP address for the mobile communication terminal 110 is not changed, mobility due to handover between base stations can be guaranteed.

The AAA 150 provides network access processing and authentication, authorization and fee calculation functions for providing Internet and other services in response to an access request signal received from the external agent 130 or the home agent 140.

In the case of a general mobile IP or proxy mobile IP technology, an authentication procedure through the AAA 150 is preceded to assign an IP to the mobile communication terminal 110. However, the mobile communication system according to the present invention preferentially assigns IP to the mobile communication terminal 110 and post-processes the authentication procedure therefor, so that the time of the initial connection or handover from the user's point of view of the mobile communication terminal 110 is maintained. Make it feel faster. Detailed description thereof will be described later.

4 illustrates a first embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a mobile IP access procedure according to the present invention in a WCDMA network. Here, since the process of step S301 to step S306 is the same as the step S101 to step S106 of Fig. 1, a detailed description thereof will be omitted.

After the mobile communication terminal 110 initially connects to the SGSN 120 or by handover, when the mobile communication terminal 110 requests the mobile IP registration to the GGSN 132 (S307), the external agent 130 GGSN 132 determines whether the mobile communication terminal 110 is initially connected or connected by handover. That is, when the mobile communication terminal 110 initially accesses the SGSN 120, since the mobile IP address information received from the mobile communication terminal 110 does not have an IP address or is set to 0.0.0.0, the GGSN 132 It can be seen that the mobile communication terminal 110 is initially connected.

When the mobile communication terminal 110 initially accesses the mobile IP registration request message received from the mobile communication terminal 110, the GGSN 132 allocates an IP address from an IP pool shared by the mobile communication terminal 110. When the mobile communication terminal 110 is connected by handover, the mobile station 110 transmits a response signal corresponding to the IP information received from the mobile communication terminal 110 to the mobile communication terminal 110 (S308). ).

Thereafter, the GGSN 132 transmits a mobile IP registration request message including the IP address information allocated to the mobile communication terminal 110 or the IP address information received from the mobile communication terminal 110 to the home agent 140. (S309).

The home agent 140 performs an authentication procedure for the AAA 150 based on the mobile IP registration request message received from the GGSN 132 (S310 and S311), and transmits a response signal thereto to the GGSN 132. (S312). If the response signal transmitted from the home agent 140 to the GGSN 132 is a rejection of approval, the GGSN 132 may perform a procedure of canceling a call connected to the mobile communication terminal 110. This is the same also in the case of other embodiments described below.

5 illustrates a second embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a proxy mobile IP access procedure according to the present invention in a WCDMA network. Here, the same member number is given to the same component as the component of FIG. In addition, since the process of step S401 and step S402 is the same as step S201 and step S202 of Fig. 2, a detailed description thereof will be omitted.

When the GGSN 132 receives a request message for creating a PDP context from the SGSN 120 (S402), the GGSN 132 receives a packet data protocol (PDP) received from the mobile communication terminal 110. The PDP context is generated according to the request message for creating the context and a response message is transmitted to the mobile communication terminal 110 through the SGSN 120 (S403 and S404). Here, the PDP context refers to a set of various types of information for connection to an external packet data network, and provides a connection to transmit and receive packet data between the terminal and the network.

The PDP context consists of parameters for PDP type, PDP address type, quality of service (QoS) profile request, etc. The GGSN 132 allocates IP to the mobile communication terminal 110 through these parameters to QoS can be set.

Meanwhile, the GGSN 132 transmits a response message for the PDP context request message to the SGSN 120, and transmits an access request message (Access Request) for an authentication procedure to the AAA 150 in response thereto (S405).

When a response message indicating the approval is received from the AAA 150 with respect to the transmitted access request message (S406), the GGSN 132 requests the home agent 140 to register the proxy mobile IP and moves to the home agent 140. The IP address of the communication terminal 110 is registered (S407 and S408). Here, the registration of the IP address of the home agent may be performed after an approval procedure is applied to the IP already assigned to the mobile communication terminal as well as the new IP allocation and the registration of the allocated IP when the mobile communication terminal initially accesses. This includes the case of confirmation and storage. The same applies to the following.

6 illustrates a third embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a mobile IP access process according to the present invention in a WiBro network.

Referring to the figure, the mobile communication terminal 210 is initially connected to the RAS 220 or connected by handover, and then transmits an Agent Solicitation Request (Agent Solicitation Request) to the external agent ACR 230 (S501). In response to the agent request message received from the mobile communication terminal 210, the ACR 230 transmits an Agent Advertisement Request to the mobile communication terminal 210 (S502).

The mobile communication terminal 210 transmits an IP registration request message (MIP Registration Request) to the ACR 230 in response to the agent advertisement request message received from the ACR 230 (S503). Here, since the process of steps S501 to S503 follows the known technique of the mobile IP access process in the WiBro network, a detailed description thereof will be omitted.

In response to the IP registration request message received from the mobile communication terminal 210, the ACR 230 allocates an IP from the IP pool shared by the ACR 230 and transmits the IP to the mobile communication terminal 210 as a response signal (S504).

In addition, the ACR 230 transmits an IP registration request message (MIP Registration Request) to the home agent 250 together with information about the IP assigned to the mobile communication terminal 210 (S505). The home agent 250 performs an authentication procedure to the AAA 240 in response to the IP registration request message received from the ACR 230, and transmits a response signal to the ACR 230 (S506 to S508).

FIG. 7 illustrates a fourth embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a proxy mobile IP access procedure according to the present invention in a WiBro network. Here, the same member number is given to the same component as the component of FIG.

Referring to the drawings, after the mobile communication terminal 210 is initially connected to the RAS 220 or connected by handover, a DHCP (Dynamic Host Configuration Protocol) display is performed between the mobile communication terminal 210 and the ACR 230. The process for the cover / offer is performed (S601), and the mobile communication terminal 210 transmits a DHCP request message (DHCP Request) to the ACR 230 (S602). Here, since the process of step S601 and step S602 follows the well-known technique of the proxy mobile IP access process in the WiBro network, a detailed description thereof will be omitted.

In response to the DHCP request message received from the mobile communication terminal 210, the ACR 230 allocates an IP from the IP pool shared by the ACR 230 and transmits the IP to the mobile communication terminal 210 as a response signal (DHCP Ack) ( S603).

In addition, the ACR 230 transmits an IP registration request message (MIP Registration Request) to the home agent 250 together with information about the IP assigned to the mobile communication terminal 210 (S604). The home agent 250 performs an authentication procedure to the AAA 240 in response to the IP registration request message received from the ACR 230 and transmits a response signal (PMIP Registration Response) to the ACR 230 (S605). To S607).

As described above, the mobile communication system and the communication method according to the present invention preferentially allocates IP from the external agent to the mobile communication terminal in response to the IP allocation request of the mobile communication terminal in a network such as WCDMA, WiBro, By post-processing the approval procedure therefor, the mobile communication terminal can be recognized that the initial access time or handover access time is accelerated by the time of the authentication process through the AAA.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the present invention is not limited to the specific embodiments of the present invention without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can make various modifications, as well as such modifications are within the scope of the claims.

1 is a diagram illustrating a general mobile IP access procedure in a WCDMA network.

2 is a diagram illustrating a general proxy mobile IP access procedure in a WCDMA network.

3 is a diagram schematically illustrating a mobile communication system according to the present invention.

4 illustrates a first embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a mobile IP access procedure according to the present invention in a WCDMA network.

5 illustrates a second embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a proxy mobile IP access procedure according to the present invention in a WCDMA network.

6 illustrates a third embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a mobile IP access process according to the present invention in a WiBro network.

FIG. 7 illustrates a fourth embodiment of a communication method using a mobile communication system according to the present invention, and illustrates a proxy mobile IP access procedure according to the present invention in a WiBro network.

<Description of Symbols for Main Parts of Drawings>

110, 210: Mobile communication terminal 120: SGSN

132: GGSN 140, 250: HA

150, 240: AAA 220: RAS

230: ACR

Claims (11)

In a mobile communication system that supports Mobile IP (Internet Protocol) or Proxy Mobile IP, A home agent (HA) for storing Internet Protocol (IP) pool information; And A foreign agent (FA) that shares at least one of the IP pool information of the home agent; And the external agent processes an IP registration procedure for the home agent after allocating an IP from the IP pool shared with the home agent to the connected mobile communication terminal. The method of claim 1, The external agent may be a gateway GPRS support node (GGSN) in a wideband code division multiple access (WCDMA) network, an access control router (ACR) in a wireless broadband network (WBro) network, or PDSN (packet data) in a code division multiple access (CDMA) network. A mobile communication system comprising at least one of: Serving Node. The method according to claim 1 or 2, And the external agent shares at least one of simple IP pool information and mobile IP pool information with the home agent. The method according to claim 1 or 2, And AAA (Authentication Authorization Accounting) for performing an authentication procedure in response to an access request signal received from the external agent or the home agent. The method of claim 3, wherein Each of the external agents used in different networks receives and stores IP pool information of different bands from the home agent. In the communication method of a mobile communication system that supports mobile IP or proxy mobile IP, Connecting the mobile communication terminal to an external agent; In response to an IP registration request from the mobile communication terminal, assigning an IP from an IP pool shared by a home agent to a mobile agent and transmitting the IP to the mobile communication terminal; And And after the step of transmitting the assigned IP to the mobile communication terminal, AAA performing an approval procedure for the IP assigned to the mobile communication terminal. The method of claim 6, wherein performing the approval procedure, The external agent sending an access request message to the AAA and receiving a response message corresponding thereto; And And transmitting, by the foreign agent, an IP registration request message to the home agent based on a response message received from the AAA, and receiving a response message thereto. The method of claim 6, wherein performing the approval procedure, The external agent sending an IP registration request message to the home agent; The home agent sending an access request message to the AAA and receiving a response message thereto; And And sending, by the home agent, a response message to the external agent to the IP registration request message. The method according to any one of claims 6 to 8, And when the approval for the IP assigned to the mobile communication terminal is rejected, the external agent terminates the call connected to the mobile communication terminal. The method according to any one of claims 6 to 8, Wherein the foreign agent includes at least one of a GGSN of a WCDMA network, an ACR of a WiBro network, and a PDSN of a CDMA network. The method of claim 10, Each of the external agents used in different networks receives and stores IP pool information of different bands from the home agent.

Images