KR20050076923A - Broadcast multicast service method for mobile ip protocol - Google Patents

Abstract

The present invention relates to a method of applying a broadcast packet data service (BCMCS) to a mobile IP protocol in a mobile communication system, wherein a mobile station transmits a message including broadcast service information to a home agent to request a mobile IP service. And setting, by the home agent, a mobility IP address to the terminal in response to the request message, and transmitting the registration message including the broadcast service information and the mobility IP address to a broadcast service controller, and the broadcast service. A process of the controller processing the message received from the home agent, and the broadcast service controller transmitting a registration permission message through the home agent, wherein the mobile IP protocol is applied to the broadcast type service. Using FA and HA It can be used in a communication network, and it is possible to provide services with only a single tunnel between PDSN / FA-HA for one BCMCS service, thereby preventing waste of resources.

Description

Broadcast service method applied to mobile IP protocol {Broadcast Multicast Service Method For Mobile IP Protocol}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to the application of a mobile IP protocol for providing a broadcast multicast service (BCMCS).

As communication technologies have evolved, various technologies for combining wireless communication networks with packet-based networks using Internet-based protocols have been developed. One of the most interesting of these technologies is the Code Division Multiple Access (CDMA) system. In the CDMA system, a voice or data received from a wireless communication network is delivered in a packet (IP packet) according to the Internet Protocol (Internet Protocol) to a packet-based IP network so that the packet has a final IP address (or mobile). Node, mobile host). Packet call service refers to all kinds of calls in which voice or data is carried in the form of packets on the whole or part of the path from the transmitting end to the receiving end.

In particular, IMT 2000 (International Mobile Telecommunication-2000) is a next-generation wireless communication system that integrates the specifications of various mobile phone systems currently being operated by each country so that a single terminal can use communication services anywhere in the world. . The IMT-2000 system can access various services through one terminal. For example, a user may conduct video conferencing while simultaneously performing graphical access of the Internet / Intranet, exchanging multimedia mail, transferring large amounts of data files, and the like. It also offers global roaming, wireless video services, video teleconferencing and two-way entertainment.

In a wireless communication system supporting packet communication, such as the IMT-2000 system, a terminal must have a unique address for identifying a terminal in a packet network in order to receive a packet call service through a packet network. In an IP network, this is an IP address. Preferably, all mobile terminals must have a unique IP address, but since the number of available IP addresses is limited, a method of temporarily allocating an IP address only when a user uses a service is mainly used.

In a wireless communication system (eg 3G packet network), there are two Internet access gateways as network elements capable of assigning IP addresses to mobile terminals. One is a packet data service node (FA) or a foreign agent (FA), and the other is a home agent (HA). The PSDN allocates an IP address to a mobile terminal requesting a simple IP service, and the HA assigns an IP address to a terminal requesting a mobile IP. If the IP address assigned by the PSDN moves to an area of another PDSN, the service is terminated to request a new connection. However, the IP address assigned by the HA is assigned to the IP address even if the mobile station moves to another area of the FA. The method that can be used invariably is Mobile IP.

The packet data service provided in the current mobile communication system is provided by the user in a single unicast manner to the network. That is, data is sent and received by designating a specific user's address, and an access network provides a service by allocating a band for data transmission to the user. Therefore, in the conventional system, in order for different users to receive the same service at the same time, the service is provided by the existing single transmission method. However, this method brings a waste of resources in a network and a wireless section for a service such as TV broadcasting and a movie that is simultaneously transmitted to multiple terminals, and causes a load on the system.

Therefore, there is a need for a method for efficiently providing a broadcast service while saving resources in a system for users who want to receive the same service at the same time.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a broadcast type service to the Mobile IP protocol in a mobile communication system.

Embodiment of the present invention created to achieve the object as described above,

A method of applying a broadcast packet data service to a mobile IP protocol in a mobile communication system, the method comprising: transmitting, by a mobile terminal, a message including broadcast service information to a home agent to request a mobile IP service;

Setting, by the home agent, a mobile IP address in response to the request message, and transmitting a registration message including the broadcast service information and the mobile IP address to a broadcast service controller;

Processing the message received from the home agent by the broadcast service controller;

The broadcast service controller is configured to include a registration permission message sent through the home agent.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

1 is a view showing the configuration of a wireless communication system supporting packet communication to which the present invention is applied.

Referring to FIG. 1, a packet communication system supporting a dynamic IP service is configured based on domains 20 and 30 and connected to each other through the Internet 10. Each IP support domain (20, 30) is a mobile communication system (22, 29, 32, 39) is known digital cellular network (Digital cellular network), personal mobile communication network (PCS network), next generation mobile communication network IMT-2000 A base transceiver system (BTS) and a base station controller (BSC) that constitute a (CDMA2000 or UMTS) network are included. In addition, the other network elements for packet call service include a home agent (HA) 26 and 36 and a packet data service node (PSDN) 23, 28, and 33 for supporting dynamic IP services. , 38), Authentication & Authorization Accounting Server (hereinafter referred to as 'AAA' or Radius Server) (27,37), Domain Name System (25,35), Dynamic Host Configuration (DHCP) Protocol) servers 24, 34, and the like.

The mobile terminals 2, 3, 4 and 5 perform the functions of the mobile host described in RFC-2002 and connect to the packet data service nodes 23, 28, 33 and 38 via radio channels. Packet data service nodes 23, 28, 33 and 38 also perform the functions of the FAs described in RFC-2002. The packet data service node, the external agent, and the home agent allocate a simple IP address to a mobile terminal for which a packet call service is desired. In this case, the simple IP address assigned by the packet data service node is assigned to another packet data service node. It changes every time you move to an area. That is, the mobile terminal using the SImple IP performs a service and is deleted when the service ends. On the other hand, the Mobile IP address assigned by the home agent is fixed in the corresponding domain, so it is used as long as it does not move to another home agent.

The AAA servers 27 and 37 perform authentication and authority verification functions and charging functions of the wireless communication network subscribers. Here, a secure channel is formed between the AAA servers. In addition, the AAA servers 27 and 37 identify subscribers using NAI (Network Access Identifier), and combine NAI (mobile host name, IP address of PDSN) with DNS servers 25 and 35, Includes the ability to perform DNS updates via a secure channel between AAAs when dynamically assigning IP addresses. That is, the counterpart host that wants to communicate with the mobile host does not know the IP address of the mobile host that is dynamically allocated. Therefore, DNS servers 25 and 35 must be updated dynamically.

The DNS servers 25 and 35 are huge distributed naming systems that map domain names and IP addresses. The DNS servers 25 and 35 map fixed domain names to changing IP addresses by dynamically updating domain names at the request of network elements. As is known, domain names are alphanumeric addresses that are used to identify hosts that access the Internet, and are easier to remember and more intuitive than IP addresses that consist of simple arrays of numbers.

In the mobile communication system configured as described above, the present invention is particularly intended to enable a structure and a broadcast service for applying Mobile IP to a broadcast service.

2 is a diagram illustrating a BCMCS structure for a mobile IP protocol to which the present invention is applied.

Referring to FIG. 2, the area for mobile communication may be divided into a home network 1, a visited network 2, and an external area 3. In the home network area 1, a BCMCS Contents Server 125 that provides broadcast content to a Home agent (HA) 121 and a BCMCS that controls the BCMCS Contents Server 125 and performs a registration process with a terminal. It is responsible for the controller (123), the home agent function of the mobile IP, the HA 121 receiving a connection or response message to the external network, and the HA 121 and the BCMCS controller (123) to interface with the home network It is configured to include an H-AAA server 105 to handle the AAA-related protocols,

The visitor network 2 includes a mobile terminal 113 supporting broadcast content, a BSC / PCF 111 for receiving a registration request for using BCMCS, and a PSDN / FA (service node for packet data). 109) and an S-AAA server 17 for processing the AAA-related protocol of the visited network.

The external network area 3 provides broadcast contents of the mobile communication system (22, 23, 32, 39 of FIG. 1) for applying the BSMCS to the mobile IP of the mobile terminal 113, and provides a BCMCS Contents Server ( 125 may be provided, and the BCMCS Content Provider 127 is configured to provide content requested by the user from the BCMCS contents server.

3 is a diagram illustrating a BCMCS registration process for Mobile IP protocol according to the present invention.

Referring to FIG. 3, in step 131, the mobile terminal 113 transmits a MIP RRQ (Mobile IP registration request) message to the PDSN / FA 109 to the PDSN / FA 109 for a Mobile IP registration request. In this case, the MIP RRQ message is, in particular, BCMCS Extension information containing information for using the BCMCS is added. 4 is a diagram showing extension information for using a BCMCS according to the present invention. Referring to FIG. 4, the BCMCS Extension includes a type field of 1 byte, a length field of 1 byte, and a data field including a BCMCS content name and a BCMCS content ID.

In step 133, the PDSN / FA 109 receiving the registration request analyzes the MIP RRQ message, and when there is no error in the MIP RRQ message, the RRQ message further including HA address information in the extension information. Transmit to 121. Here, the HA address information may be pre-allocated at the terminal or may be allocated at the PDSN.

In step 135, the HA 121 allocates a Mobile IP through the RRQ message, and transmits the Mobile IP and the Extension information to the BCMCS Controller 117.

In another embodiment, in step 139a, the HA 121 transmits the RRQ message via the H-AAA according to an interface message according to a system to which it is applied. This is because the interface of the existing HA and H-AAA can be used as it is. Then, in step 141a, the H-AAA 105 is added to the BCMCS Content Server 125 and transmitted to the BCMCS Controller 123.

In step 137, the BCMCS Controller 117 checks whether the corresponding user is a BCMCS-enabled user with the message received from the HA 121, and if the user is an available user, the BCMCS content server includes the extension information included in the message. In operation 119, the corresponding content is multicast routed, and an authorization message including authorization of a service is transmitted to the HA 121.

In another embodiment, in step 141b, the BCMCS controller 117 processes the message in the same manner as step 137, and then transmits the authorization message to the H-AAA 105.

In step 139b, the H-AAA 105 stores the authorized BCMCS content name and ID stored in the BCMCS content server 119 included in the received authorization message, and the address and user information of the FA to which the user belongs. The authorization message is stored and transmitted to the HA 121.

In step 143, the HA 121 stores the content name and ID of the corresponding BCMCS received from the authorization message in the BCMCS service table, and the authorization success of the service in the BCMCS extension, and the Registration Request Reply (RRP) message is stored. Send to PDSN / FA 109.

In step 145, the PDSN / FA 109 transmits the received RRP message to the mobile terminal 113.

After the registration process of Mobile IP to use the BCMCS as described above, since the multicasting address and each port are uniquely determined for the BCMCS ID, the PDSN / FA and the HA have a single tunnel for the BCMCS. That is, since each agent has a user table for the BCMCS service, a tunnel between PDSN / FA-HA is first installed for the first user who wants to use the corresponding BCMCS service, and users who use the BCMCS service share the tunnel. do. The tunnel is released when the last user leaves the network.

In step 147, through the above Mobile IP registration, the mobile terminal 113 can receive the BCMCS data service through the PDSN / FA-HA tunnel. If the user designates the content that the user wants to receive, the RRQ message corresponding to the corresponding content name, ID, and Mobile IP is transmitted to the BCMCS controller 123, and the information on the corresponding content is transmitted through the RRP message.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

The present invention operating as described in detail above enables the broadcast type service to be used in a communication network using FA and HA to which the mobile IP protocol is applied.

Therefore, the service can be provided by only one tunnel between PDSN / FA-HA for one BCMCS service, thereby preventing waste of resources.

1 is a view showing the configuration of a wireless communication system supporting packet communication to which the present invention is applied.

2 is a diagram illustrating a BCMCS structure for a mobile IP protocol to which the present invention is applied.

3 is a diagram illustrating a BCMCS registration process for a mobile IP protocol according to the present invention.

4 is a diagram showing extension information for using a BCMCS according to the present invention;

Claims (6)

A method of applying a broadcast packet data service to a mobile IP protocol in a mobile communication system, The mobile station transmits a request message including broadcast service information to an external agent and a home agent for requesting a mobile IP service and a broadcast service, and a registration message including the broadcast service information and the mobile IP address. Transmitting to the controller, And the broadcast service controller processes the registration message and transmits a registration permission message to the mobile terminal through the home agent and an external agent. The method of claim 1, wherein the broadcast service information comprises a broadcast service content name and a service ID to be requested by the mobile terminal. The process of claim 1, wherein the home agent transmits the registration message. And transmitting the registration message from the home agent to the broadcast service controller via a home agent side charging and authentication server. 4. The method according to claim 3, wherein the home agent and the home agent billing and authentication server respond to the registration permission message, and the content name and service ID of the broadcast service, the address to which the mobile terminal belongs, and the broadcast service table. The method further comprises the step of storing the user information. The process of claim 1, wherein the broadcast service controller transmits the registration grant message. The broadcast service information and the mobile IP address are registered in a broadcast service server, and if the user of the mobile terminal can use the broadcast service, the registration authorization message including the corresponding broadcast service information is transmitted to the home agent and the external agent. And transmitting to the mobile terminal through. The method of claim 1, further comprising: forming a single tunnel for the broadcast service between the external agent and the home agent, and transmitting broadcast data from a broadcast service server to the mobile terminal using the single tunnel. Characterized in that the method.