KR101568715B1 - / apparatus and method for supporting multicast/broadcast service of terminal in mobile communication system based on proxy mobile ip service - Google Patents

Abstract

The present invention relates to an apparatus and method for providing a multicast / broadcast service to a terminal in a mobile communication system supporting a Proxy Mobile IP service, and more particularly, to a method and apparatus for receiving a multicast / broadcast packet from a terminal Adding a header for providing a multicast / broadcast service of the terminal to the received packet; adding a header for providing a proxy mobile IP service of the terminal to the packet to which the header is added; And transmitting the multicast / broadcast packet with the two headers to a Home Agent (HA), thereby providing an advantage of being able to provide a multicast / broadcast service to a terminal without adding a special function or changing settings have.

Proxy Mobile IP, Broadcast, Multicast, Foreign Agent (FA), Home Agent (HA)

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for providing a multicast / broadcast service to a terminal in a mobile communication system supporting a proxy mobile IP service, and a method and apparatus for providing a multicast /

The present invention relates to an apparatus and method for providing a multicast / broadcast service to a terminal in a mobile communication system supporting a Proxy Mobile IP (IP) service. More particularly, To an apparatus and method for providing a multicast / broadcast service to a terminal by adding a multicast / broadcast function of a terminal to a foreign agent (FA) and a home agent (HA), which are subjects of providing a mobile IP service .

An IP (Internet Protocol) service provided to a terminal in a mobile communication network is divided into a simple IP that does not provide IP mobility and a mobile IP that provides IP mobility.

In the case of using the simple IP service, the terminal can not use the IPv4 (Internet protocol version 4) address allocated to the first wireless data service when it is moved to the area of another base station controller. This is because, when the mobile station moves to the area of the new base station controller, the mobile station must be assigned a new IP address provided by the corresponding base station controller. When the simple IP service is used, the continuity of the data service is not ensured because the continuity of the IP address is lost.

On the other hand, in the case of using the mobile IP service, the terminal can continuously maintain the IPv4 address assigned when first accessing the wireless data service, until the wireless data service is terminated, irrespective of physical movement. This is because FA (Foreign Agent) and HA (Home Agent) operate for the IP address continuity of the terminal. In a typical mobile communication system, a base station controller provides the function of the FA.

However, in order to use the mobile IP service providing IP mobility of the terminal, software supporting the mobile IP protocol must be installed in the terminal. Because of these requirements, mobile IP services have not spread widely in spite of the fact that the mobile IP standard has been established for a long time.

Proxy Mobile IP is a proposed method to solve this problem. The proxy mobile IP performs a necessary mobile IP related function on behalf of the terminal when the terminal does not have the software supporting the mobile IP protocol installed therein. In this case, the terminal requests the service with simple IP, but the base station controller converts the corresponding simple IP into the proxy mobile IP and provides the IP mobility of the terminal with the help of FA and HA.

When the proxy mobile IP service is used, the mobile terminal can enjoy IP mobility. However, since the proxy mobile IP is not a complete mobile IP, when the mobile IP is used, the IP multicast or broadcast broadcast service is not available. In broadcasting or multicasting defined in the Mobile IP standard, tunneling such as IP in IP or IP in GRE (Generic Routing Encapsulation) is further performed for packet delivery, In the case of the present invention. The tunneling refers to a process of encapsulating a packet by adding an IP header or removing an IP header from a packet to decapsulate the packet.

If the terminal recognizes that it uses the mobile IP service, it can perform additional tasks such as tunneling when processing a multicast / broadcast packet. However, in the Proxy Mobile IP, the UE does not recognize the fact that it uses the mobile IP service, and thus does not perform the additional task necessary for the processing of the multicast / broadcast packet. Therefore, the terminal using the proxy mobile IP service can not use the IP multicast or the broadcast service.

In addition, in the mobile IP protocol, when a terminal uses a multicast / broadcast service, a CoA (Care of Address) is used instead of a Foreign Agent COA (FACOA) ) (A method in which a terminal is allocated a separate COA) is used. However, in a wireless data service such as WiMax, only the FACOA method is provided for overhead of an air section and efficient use of an IP address. Therefore, there is a problem in that multicast / broadcast processing can not be performed in the mobile IP based on the CCOA scheme as described above.

An object of the present invention is to provide an apparatus and method for providing a multicast / broadcast service to a terminal in a mobile communication system supporting a proxy mobile IP service.

It is another object of the present invention to provide a method and system for providing a mobile agent in a mobile communication system supporting proxy mobile IP service, in which a foreign agent (FA) and a home agent (HA), which are subjects of providing a proxy mobile IP service, And an apparatus and method for providing a multicast / broadcast service to a terminal by adding a cast / broadcast function.

It is another object of the present invention to provide a multicast / broadcast service (hereinafter referred to as " multicast / broadcast service ") service in a mobile communication system supporting a proxy mobile IP service, And removes a header for providing the multicast / broadcast service of the terminal on behalf of the terminal when the downlink multicast / broadcast packet processing from the core network is performed, thereby providing the terminal with multicast / broadcast And an apparatus and method for providing a cast service.

According to an aspect of the present invention, there is provided a method for providing a multicast / broadcast service to a terminal by a foreign agent (FA) in a mobile communication system supporting a Proxy Mobile IP service, Receiving a multicast / broadcast packet from a terminal; adding a header for providing a multicast / broadcast service of the terminal to the received packet; Adding a header for providing a proxy mobile IP service, and transmitting a multicast / broadcast packet to which the two headers are added to a home agent (HA).

According to an aspect of the present invention, there is provided a method for a foreign agent (FA) to provide a multicast / broadcast service to a terminal in a mobile communication system supporting a Proxy Mobile IP service, , Receiving a multicast / broadcast packet from a home agent (HA), removing a header for providing a proxy mobile IP service of the terminal in the received packet, The method comprising the steps of: removing a header for providing a multicast / broadcast service of the multicast / broadcast service; and transmitting the multicast / broadcast packet from which the two headers have been removed to the terminal.

According to an aspect of the present invention, there is provided an apparatus for providing a multicast / broadcast service to a terminal in a mobile communication system supporting a Proxy Mobile IP service, the apparatus comprising: a multicast / A header for providing a multicast / broadcast service of the terminal and a header for providing a proxy mobile IP service of the terminal are added to a multicast / broadcast packet received from the terminal, And a FA (Foreign Agent) for transmitting a multicast / broadcast packet to which the two headers are added to an HA (Home Agent).

The present invention adds a terminal multicast / broadcast function to a foreign agent (FA) and a home agent (HA), which are subjects of providing a proxy mobile IP service in a mobile communication system supporting a proxy mobile IP service, There is an advantage that a multicast / broadcast service can be provided to the terminal without adding a function or changing the setting.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, in which: FIG. 1 is a block diagram illustrating a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention; An apparatus and method for providing a multicast / broadcast service to a terminal by adding a broadcast function will be described.

It should be understood that the present invention is applicable to various mobile communication services such as Mobile WiMAX, 3rd Generation Partnership Project (3GPP), and 3GPP2 that provide IP mobility of a mobile station based on mobile IP.

1 is a block diagram of a mobile communication system supporting a proxy mobile IP service according to the present invention.

As shown in the figure, the mobile communication system supporting the proxy mobile IP service includes a mobile node 100, a base station 110, a foreign agent 120, a home agent 130 ).

Referring to FIG. 1, the HA 130 provides IP mobility of a UE to receive a packet destined for the UE from the core network, and then delivers the packet to the UE via the FA . In case of the opposite direction, it receives the packet transmitted from the terminal through the FA and transfers it to the core network.

The FA 120 is a node for providing IP connectivity of a terminal and acts as a gateway to the terminal. In addition to the conventional functions, the FA 120 performs the multicast / broadcast function of the terminal 100 when the IP service of the terminal 100 is a proxy mobile IP service. That is, the FA 120, when processing an uplink multicast / broadcast packet from the terminal 100, may perform a multicast / broadcast service for providing the multicast / broadcast service of the terminal 100 on behalf of the terminal 100 Header, and removes the header for providing the multicast / broadcast service of the terminal 100 on behalf of the terminal 100 when processing the downlink multicast / broadcast packet from the core network. In the mobile WiMAX system, an Access Serving Network Gateway (ASN-GW) can perform the function of the FA.

The base station 110 is connected to the FA 120 by wire and is wirelessly connected to the terminal 100 to transmit a signal from the FA 120 to the terminal 100, To the FA 120. The FA 120 transmits the signal to the FA 120. [

The terminal 100 is provided with a multicast / broadcast service without any special function addition or setting change even when using the proxy mobile IP service according to the present invention.

In the present invention, a basic wireless Internet service setting process or a proxy mobile IPv4 setting process is the same as the existing process. However, in order to support the multicast / broadcast function of the terminal, information setting about multicast / broadcast function support should be added to the existing proxy mobile IPv4 call setup process as follows.

2 is a signal flow diagram illustrating a proxy mobile IPv4 call setup process in a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention.

Referring to FIG. 2, the MS 200 transmits an IP Service Request message to the FA 220 in step 201.

The FA 220 having received the IP service request message transmits a Proxy Mobile IPv4 Registration Request message to the HA 230 in step 203. Here, in order to request permission of the multicast / broadcast service to the terminal 200, the FA 220 sets a broadcast ('B') flag of the proxy mobile IPv4 registration request message And transmits it to the HA 230.

After receiving the proxy mobile IPv4 registration request message, the HA 230 obtains the profile information of the terminal 200 from an external server (for example, AAA) in step 205, and transmits the profile information to the terminal 200 0.0 > multicast / broadcast < / RTI > When the HA 230 determines to allow the multicast / broadcast service to the terminal 200, the HA 230 assigns an IP address to the terminal 200. Here, the IP address may be allocated by the external server.

In step 207, the HA 230 transmits a Proxy Mobile IPv4 Registration Reply message including the assigned IP address to the FA 220. Here, in order to respond to the multicast / broadcast service permission request for the terminal 200, the HA 230 transmits a broadcast ('B') flag of the proxy mobile IPv4 registration request message And transmits it to the HA 230.

In step 209, the FA 220 checks the broadcast ('B') flag of the proxy mobile IPv4 registration response message to determine whether the multicast / broadcast service for the terminal 200 is permitted And transmits an IP Service Response message including the IP address to the terminal 200 according to the determination result. Accordingly, the terminal 200 can then transmit and receive packets using the IP address.

3 is a flowchart illustrating a proxy mobile IPv4 call setup method of an FA in a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention.

Referring to FIG. 3, in step 301, the FA determines whether an IP service request message is received from a terminal.

When the reception of the IP service request message is detected, the FA transmits a Proxy Mobile IPv4 Registration Request message to the HA in step 303. Here, in order to request permission of the multicast / broadcast service to the terminal, the FA sets a broadcast ('B') flag of the proxy mobile IPv4 registration request message and transmits the flag to the HA.

In step 305, the FA determines whether a Proxy Mobile IPv4 Registration Reply message including multicast / broadcast service permission / inhibition information for the UE is received from the HA. Herein, the multicast / broadcast service permission / non-permission information for the terminal can be confirmed through a broadcast ('B') flag of the proxy mobile IPv4 registration request message. In addition, the proxy mobile IPv4 registration response message includes the IP address allocated to the terminal according to whether the multicast / broadcast service is permitted to the terminal.

In step 307, the FA transmits an IP Service Response message including an IP address allocated to the UE to the UE according to whether the multicast / broadcast service is allowed.

Thereafter, the FA terminates the algorithm according to the present invention.

4 is a diagram illustrating a method for an FA to process an uplink multicast / broadcast packet from a mobile station in a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention.

Referring to FIG. 4, the UE transmits an uplink multicast / broadcast packet to the FA. The uplink multicast / broadcast packet transmitted by the terminal includes a payload 400 and an IP header 402. The IP header 402 includes an IP source address Address as a destination IP address of the packet and a multicast group IP address / broadcast address as an IP destination address of the packet.

The FA checks whether the packet is an uplink multicast / broadcast packet using the IP header 402 of the packet received from the terminal. That is, when the IP destination address of the packet received from the terminal is a multicast group IP address / broadcast address and the terminal is using the proxy mobile IP service, the FA transmits the packet to the uplink multicast / Packet can be determined. Since the FA knows the type of service used by the terminal, the FA can determine whether the terminal is using the proxy mobile IP service. If the packet received from the terminal is an uplink multicast / broadcast packet, the FA adds a header 404 for providing the multicast / broadcast service of the terminal to the received packet, Encapsulates the packet. The header 404 for providing the multicast / broadcast service of the terminal includes the IP address of the terminal as the IP source address of the packet and the IP address of the HA as the IP destination address of the packet. In the mobile IPv4 environment according to the related art, the header 404 for providing the multicast / broadcast service of the terminal is a header added by the terminal transmitting the uplink multicast / broadcast packet. However, in the proxy mobile IP, IP service is being used, the FA performs this role in the present invention.

In addition, the FA adds a header 406 for providing a Proxy Mobile IPv4 service of the terminal to the packet to which the header 404 is added, that is, for transmitting the packet to the HA, thereby encapsulating the packet I will. Here, the header 406 for providing the proxy Mobile IPv4 service of the terminal includes the IP address of the FA as the IP source address of the packet and the IP address of the HA as the IP destination address of the packet. Here, the IP address of the FA follows the FACOA scheme. Then, the FA transmits a multicast / broadcast packet to which the two headers 404 and 406 are added to the HA.

The HA confirms that the packet received from the FA is doubly encapsulated, removes the added two headers 404 and 406, changes the packet to the packet type first transmitted by the terminal, And transmits it to the destination of the packet. Thus, the servers corresponding to the multicast group IP address / broadcast address can receive packets transmitted by the terminal.

5 is a diagram illustrating a method for an FA to process a downlink multicast / broadcast packet from a core network in a mobile communication system supporting a proxy Mobile IP service according to an embodiment of the present invention.

Referring to FIG. 5, the server transmits a downlink multicast / broadcast packet to the HA. The downlink multicast / broadcast packet transmitted by the server includes a payload 500 and an IP header 502. The IP header 502 is an IP source address of the packet, And a multicast group IP address / broadcast address as an IP destination address of the packet.

The HA checks whether the corresponding packet is a downlink multicast / broadcast packet using the IP header 502 of the packet received from the server, and confirms whether or not the proxy mobile IP service is allowed to the corresponding terminal. When the IP destination address of the packet received from the server is a multicast group IP address / broadcast address, the HA can determine that the packet is a downlink multicast / broadcast packet. If the packet received from the server is a downlink multicast / broadcast packet and a proxy mobile IP service is allowed to the terminal, the HA provides the multicast / broadcast service of the terminal to the received packet A header 504 is added to encapsulate the packet primarily. The header 504 for providing the multicast / broadcast service of the terminal includes an IP address of the HA as an IP source address of the packet and an IP address of the terminal as an IP destination address of the packet.

In addition, the HA adds a header 506 for providing a Proxy Mobile IPv4 service of the terminal to the packet to which the header 504 is added, that is, for transmitting the packet to the FA, and encapsulates the packet in a secondary I will. Here, the header 506 for providing the proxy mobile IPv4 service of the terminal includes the IP address of the HA as the IP source address of the packet and the IP address of FA as the IP destination address of the packet. Here, the IP address of the FA follows the FACOA scheme. Thereafter, the HA transmits a multicast / broadcast packet to which the two headers 504 and 506 are added to the FA.

The FA confirms that the packet received from the HA is doubly encapsulated, removes the added two headers 504 and 506, changes the packet to the packet type first transmitted by the server, And transmits it to the destination of the packet. That is, the FA first checks the header 506 for providing the proxy mobile IPv4 service of the terminal, determines that the corresponding header 506 is a header added for the mobile IP terminal, and then removes the corresponding header 506. Also, the FA checks a header 504 for providing a multicast / broadcast service of the terminal, determines that the packet is a packet for providing a multicast / broadcast service of the terminal, and then adds a corresponding header 504 Remove. Here, if the packet received from the HA has three IP headers and the terminal is using the proxy mobile IP service, the FA determines that the packet is a packet for providing the multicast / broadcast service of the terminal . At this time, since the FA knows the type of service used by the UE, the FA can determine whether the UE is using the proxy mobile IP service. Here, before the FA removes the header 504 for providing the multicast / broadcast service of the terminal, the FA transmits the header 504 to the destination address to which the packet with the two headers 504 and 506 removed is transmitted And transmits the packet from which the two headers 504 and 506 have been removed to the destination address. In the mobile IPv4 environment according to the related art, the header 504 for providing the multicast / broadcast service of the terminal is a header removed by the terminal receiving the downlink multicast / broadcast packet. However, in the proxy mobile IP, IP service is being used, the FA performs this role in the present invention. Thus, the terminals corresponding to the multicast group IP address / broadcast address can receive packets transmitted by the server.

6 is a flowchart illustrating a procedure of a method for an FA to process an uplink multicast / broadcast packet from a mobile station in a mobile communication system supporting a proxy Mobile IP service according to an embodiment of the present invention.

Referring to FIG. 6, in step 601, the FA determines whether an uplink multicast / broadcast packet is received from a terminal. Here, the uplink multicast / broadcast packet transmitted by the terminal includes a payload and an IP header. The IP header includes an IP address of the terminal as an IP source address of the packet, and an IP destination address of the packet Multicast group IP address / broadcast address.

When the uplink multicast / broadcast packet is received from the terminal, the FA checks whether the corresponding packet is an uplink multicast / broadcast packet using the IP header of the packet received from the terminal in step 603, When the packet received from the terminal is an uplink multicast / broadcast packet, a header for providing the multicast / broadcast service of the terminal is added to the received packet to primarily encapsulate the packet. Here, if the IP destination address of the packet received from the terminal is a multicast group IP address / broadcast address and the terminal is using the proxy mobile IP service, the FA transmits the uplink multicast / broadcast packet . ≪ / RTI > Also, since the FA knows the type of service used by the UE, the FA can determine whether the UE is using the proxy mobile IP service. The header for providing the multicast / broadcast service of the terminal includes the IP address of the terminal as the IP source address of the packet and the IP address of the HA as the IP destination address of the packet.

In step 605, the FA adds a header for transmitting a Proxy Mobile IPv4 service of the UE to the packet to which the header is added, that is, for transmitting the packet to the HA, and encapsulates the packet in a secondary . Here, the header for providing the proxy mobile IPv4 service of the terminal includes an IP address of the FA as an IP source address of the packet and an IP address of the HA as an IP destination address of the packet. The IP address of the FA is FACOA Method.

In step 607, the FA transmits a multicast / broadcast packet to which the two headers are added to the HA.

Thereafter, the FA terminates the algorithm according to the present invention.

7 is a flowchart illustrating a procedure of a method for an FA to process downlink multicast / broadcast packets from a core network in a mobile communication system supporting a proxy Mobile IP service according to an embodiment of the present invention.

Referring to FIG. 7, in step 701, the FA determines whether a downlink multicast / broadcast packet from a server is received from the HA. Here, if the packet received from the HA has three IP headers and the terminal is using the proxy mobile IP service, the FA determines that the packet is a packet for providing the multicast / broadcast service of the terminal . At this time, since the FA knows the type of service used by the UE, the FA can determine whether the UE is using the proxy mobile IP service.

When the downlink multicast / broadcast packet from the HA is received from the HA, the FA removes the header added by the HA for providing the proxy mobile IPv4 service of the terminal in the packet in step 703.

In step 705, the FA additionally removes the header added by the HA to provide the multicast / broadcast service of the terminal in the packet from which the header is removed. Here, before removing the header for providing the multicast / broadcast service of the terminal, the FA checks the destination address to which the two headers are removed using the header, Packet transmission.

In step 707, the FA transmits the packet from which the two headers have been removed to the destination of the corresponding packet.

Thereafter, the FA terminates the algorithm according to the present invention.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 is a block diagram of a mobile communication system supporting a proxy mobile IP service according to the present invention;

2 is a signal flow diagram illustrating a proxy mobile IPv4 call setup process in a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention;

3 is a flowchart illustrating a proxy mobile IPv4 call setup method of an FA in a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention.

4 is a diagram illustrating a method for an uplink multicast / broadcast packet from an MS in a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention;

5 is a diagram illustrating a method for an FA to process a downlink multicast / broadcast packet from a core network in a mobile communication system supporting a proxy Mobile IP service according to an embodiment of the present invention;

6 is a flowchart illustrating a procedure of a method for an FA to process an uplink multicast / broadcast packet from a mobile station in a mobile communication system supporting a proxy mobile IP service according to an embodiment of the present invention;

FIG. 7 is a flowchart illustrating a procedure of a method for an FA to process a downlink multicast / broadcast packet from a core network in a mobile communication system supporting a proxy Mobile IP service according to an embodiment of the present invention.

Claims (24)

A method of operating a foreign agent (FA) in a mobile communication system, Receiving a packet from a terminal, Adding a first header for providing a multicast / broadcast service of the terminal and a second header for providing a proxy mobile IP service of the terminal to the packet; And transmitting the packet including the first header and the second header to a home agent (HA). The method according to claim 1, The packet includes a payload and an internet protocol (IP) header, The IP header includes an IP address of the terminal as an IP source address of the packet and a multicast group IP address / broadcast address (IP address) as an IP destination address of the packet broadcast address. The method according to claim 1, Wherein the first header includes an IP address of the terminal as an IP source address of the packet and an IP address of the HA as an IP destination address of the packet. The method according to claim 1, Wherein the second header includes an IP address of the FA as an IP source address of the packet and an IP address of the HA as an IP destination address of the packet. 5. The method of claim 4, Wherein the IP address of the FA conforms to a foreign agent COA (FACOA) scheme. The method according to claim 1, The process of receiving the packet includes: And determining that the packet is a multicast / broadcast packet when the IP destination address of the packet is a multicast group IP address / broadcast address and the terminal is using a proxy mobile IP service. How to. A method of operating a foreign agent (FA) in a mobile communication system, Receiving a packet including a first header for providing a multicast / broadcast service of a terminal from an HA (home agent) and a second header for providing a proxy mobile IP (internet protocol) service of the terminal; Removing the first header and the second header from the packet; And transmitting the packet to the terminal. 8. The method of claim 7, wherein the step of receiving the packet comprises: And determining that the packet is a multicast / broadcast packet when the packet includes three IP headers and the terminal is using a proxy mobile IP service. 8. The method of claim 7, Wherein the second header includes an IP address of the HA as an IP source address of the packet and an IP address of an FA as an IP destination address of the packet. 10. The method of claim 9, Wherein the IP address of the FA conforms to a foreign agent COA (FACOA) scheme. 8. The method of claim 7, Wherein the first header includes an IP address of the HA as an IP source address of the packet and an IP address of the terminal as an IP destination address of the packet. 8. The method of claim 7, The packet includes a payload and an IP header. The IP header includes an IP address of the server as an IP source address of the packet, a multicast address of the packet as an IP destination address of the packet, And a multicast group IP address / broadcast address. An apparatus for providing a communication service in a mobile communication system, A terminal for transmitting a packet, Adding a first header for providing a multicast / broadcast service of the terminal and a second header for providing a proxy mobile IP service of the terminal to the packet, and transmitting the packet including the first header and the second header And a foreign agent (FA) for transmitting to a home agent (HA). 14. The method of claim 13, The packet includes a payload and an IP header. The IP header includes an IP address of the terminal as an IP source address of the packet, and a destination address of the packet. And a multicast group IP address / broadcast address. 14. The method of claim 13, Wherein the first header includes an IP address of the terminal as an IP source address of the packet and an IP address of the HA as an IP destination address of the packet. 14. The method of claim 13, Wherein the second header includes an IP address of the FA as an IP source address of the packet and an IP address of the HA as an IP destination address of the packet. 17. The method of claim 16, Wherein the IP address of the FA conforms to a foreign agent COA (FACOA) scheme. 14. The method of claim 13, Wherein the FA determines that the packet is a multicast / broadcast packet when the IP destination address of the packet is a multicast group IP address / broadcast address and the terminal is using a proxy mobile IP service. . 14. The method of claim 13, Wherein the FA removes the first header and the second header from the packet and transmits the packet from which the first header and the second header are removed to the terminal. 20. The method of claim 19, Wherein the FA determines that the packet is a multicast / broadcast packet when the packet includes three IP headers and the terminal is using a proxy mobile IP service. 20. The method of claim 19, Wherein the second header includes an IP address of the HA as an IP source address of the packet and an IP address of an FA as an IP destination address of the packet. 22. The method of claim 21, Wherein the IP address of the FA conforms to a foreign agent COA (FACOA) scheme. 20. The method of claim 19, Wherein the first header includes an IP address of the HA as an IP source address of the packet and an IP address of the terminal as an IP destination address of the packet. 20. The method of claim 19, The packet includes a payload and an IP header. The IP header includes an IP address of the server as an IP source address of the packet, a multicast address of the packet as an IP destination address of the packet, And a multicast group IP address / broadcast address.

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