KR100943558B1 - Method and apparatus for roaming service in digital broadcast system - Google Patents

Abstract

A user and service roaming method and system in a digital broadcasting system are provided to allow a terminal to normally receive a desired service even in a visit network not in a home network. When a terminal(119) corresponding to a subscriber of a home service provider roams a service area of another service provider, the terminal receives ESG(Electronic Service Guide) of the other service provider and determines a roaming type on the basis of a list of services provided by the ESG. And then, the terminal performs user roaming and service roaming according to the determined roaming type.

Description

Roaming service method and device in a digital broadcasting system {METHOD AND APPARATUS FOR ROAMING SERVICE IN DIGITAL BROADCAST SYSTEM}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 illustrates a mobile broadcasting related network architecture according to a preferred embodiment of the present invention.

2 illustrates a roaming related network architecture according to a preferred embodiment of the present invention.

3 is a flowchart illustrating the basic operation of a receiver according to an embodiment of the present invention.

Figure 4 is a flow chart showing the basic operation of the transmitter according to an embodiment of the present invention.

5 is a block diagram showing the structure of a transmitter according to an embodiment of the present invention.

6 is a block diagram showing the structure of a receiver according to an embodiment of the present invention.

7A and 7B illustrate a message flow in accordance with one embodiment of the present invention.

8 is a flowchart illustrating the basic operation of a receiver according to another embodiment of the present invention.

9 is a flow chart showing the basic operation of the transmitter according to another embodiment of the present invention.

10 is a diagram illustrating a message flow according to another embodiment of the present invention.

The present invention relates to digital broadcasting, and more particularly, to a method and system for a receiving terminal roaming service from a home network to a foreign network.

Today, due to the development of communication and broadcasting technology, a broadcasting system or a mobile communication system provides portable broadcasting, and can transmit packet data through a broadcast channel as well as a general broadcasting service limited to a conventional voice and image. Mobile Broadcast is being discussed. The portable broadcast includes the discovery of a service by a mobile terminal such as a mobile phone, a notebook computer, a personal digital assistant (PDA), etc. that can receive the portable broadcast, a subscription of the service by the mobile terminal, and various control information for receiving the service. It can be made of a process of providing, the transmission of the service and the reception of the service by the mobile terminal.

The Open Mobile Alliance (hereinafter referred to as OMA) is one of the organizations that research standards for interoperability of individual mobility solutions, and is mainly responsible for setting various application standards for mobile games and Internet services. Doing. Among the working groups of OMA, in particular, the OMA BAC (Mobile Broadcast Sub Working Group) is studying a technology for providing a broadcast service using a mobile terminal capable of communicating with an interactive network.

A terminal for receiving a broadcast service in a mobile broadcasting system receives a service guide (SG) including description information about the service itself, billing information for the service, and information on a method of receiving the service. The service will be received using the service guide.

In a mobile broadcasting system, when a terminal moves to a network of another service provider (that is, a visited network) instead of the home service provider's network (that is, a home network) to which the user subscribes, the user may use the terminal owned by the user. You want to receive the services of a home network broadcast service or a foreign service provider in a roaming contract. Therefore, there is a need for a procedure and system structure for efficiently providing roaming of a broadcast service in a portable broadcasting system.

The present invention provides a roving service method and apparatus for receiving a desired broadcast service through user roaming and service roaming in a visited network operated by another service provider rather than a home service provider in a digital broadcasting system.
In a digital broadcasting system according to the present invention, a roaming service method for a terminal includes: receiving an electronic service guide (ESG) from the visited network after the terminal enters a visited network from a home network; Based on whether the broadcast service desired to be received by the terminal is provided in the visited network, determining a roaming type between user roaming and service roaming; and if the user roams, the roaming type is determined from the visited network. And receiving the broadcast service to be received, and receiving the broadcast service to be received from the home network through the visited network from the home network if the service roaming is determined.
In addition, a roaming service method for a terminal in a digital broadcasting system according to the present invention includes receiving a roaming request message from a terminal entering a visited network from a home network and whether the roaming type indicated by the roaming request message is user roaming or service roaming. And determining, by the user roaming, providing the broadcast service that the terminal wants to receive from the visited network to the terminal, and when determined by the service roaming, the broadcast service that the terminal wants to receive. And receiving the information from the home network and providing the same to the terminal.
In addition, in the digital broadcasting system according to the present invention, a roaming service apparatus of a terminal is connected to a broadcast network to receive data and signaling signals of a broadcast service, and a roaming service connected to a bidirectional network connected to the broadcast network. A bidirectional converter for transmitting and receiving related signals, and a broadcast to be received by the terminal based on an electronic service guide (ESG) from the visited network received through the broadcast receiver when the terminal enters the visited network from the home network. The broadcast receiver determines the roaming type as either user roaming or service roaming according to whether a service is provided in the visited network, and receives the broadcast service to be received from the visited network when the user roaming is determined. And a mobility management (MM) block for controlling the bidirectional converter to receive the broadcast service to be received through the visited network from the home network when the service roaming is determined.
In addition, a roaming service apparatus for a terminal in a network of a digital broadcasting system according to the present invention, receives a roaming request message from a home network to which the terminal capable of receiving a broadcast service is subscribed, and the terminal entering the visited network from the home network. Determine whether the roaming type indicated by the roaming request message is user roaming or service roaming; and if the user roaming is determined, provide a broadcast service to be received by the terminal from the visited network to the terminal. If determined, the terminal includes the visited network, which receives the broadcast service to be received from the home network and provides the broadcast service to the terminal.

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.

In a system according to a preferred embodiment of the present invention, when a receiver, ie, a terminal, that is a subscriber of a home service provider roams from a service area of the home service provider to a service area of a foreign service provider, the terminal first receives another. After receiving an electronic service guide (hereinafter referred to as an ESG) of a service provider, determining a roaming type based on a list of services provided by the ESG, one of user roaming and service roaming according to the determined roaming type. Will be performed. Herein, user roaming means that a terminal moves to a visited network operated by another service provider and receives a service provided by the other service provider. Service roaming means moving to a visited network operated by another service provider. After that, it means that the service provided by the home service provider is provided. Here, the service received by the terminal in the visited network may have the same content or different content as the service received in the home network before roaming.

1 is a block diagram of a portable broadcasting related network according to a preferred embodiment of the present invention. The blocks shown here are logical entities, separated by major functional differences, and may be physically separated or located within the same server.

Referring to FIG. 1, a content provider 101 (hereinafter referred to as CC) produces a content source of a broadcast service and sends it to a service application block 104 (hereinafter referred to as SA). The service application block 104 generates a specific service with content sources from the content provider 101 and additionally metadata required for service configuration. The service management block 108 (hereinafter referred to as SM) performs functions such as service configuration, resource allocation, electronic service guide provisioning, and security.

The broadcast network 122 is a network for transmitting broadcast service data, and as an example, a DVB (Digital Video Broadcasting) -H (Handheld) system, and the interactive network 123 is generally used. A cellular network, and as another example, may be any kind of network that provides a function of receiving information or a request from a terminal and transmitting a response to the information or the request. Reference numeral 119 denotes a user terminal, and indicates a receiver that can access a bidirectional network and receive a broadcast service.

In FIG. 1, an interface between each entity including the aforementioned logical entities is defined.

X-1. X-2 and X-3 interfaces refer to a reference point between a broadcast network and another entity, and are generally not used in a bidirectional standard based on DVB-H. The X-1 interface connects between the content provider 101 and the service application block 104, the X-2 interface connects between the bidirectional network 123 and the terminal 119, and the X-3 interface connects the service management block. A connection between the 108 and the bidirectional network 123 is performed.
The Convergence of Broadcasting and Mobile Service (CBMS) -1 interface carries broadcast related signaling, and the CBMS-2 interface carries contents such as audio, video, and files. The CBMS-3 interface carries the electronic service guide. The CBMS-4 interface carries the electronic service guide in the form of point-to-point (PtP) transmission. The CBMS-5 interface carries Short Message Service (SMS), Multimedia Message Service (MMS), and the like in the form of end-to-end transmission. The CBMS-6 interface carries configuration parameters such as the number of services, the allocated bandwidth for DVB-H transmission. The CBMS-7 interface carries the declaration or metadata of the service application. Descriptions of the functions of the above-described interfaces are only representative, and the functions of the interfaces are not limited only by the above description.

2 illustrates an architecture related to roaming based on the basic architecture of FIG. 1 and logical functional blocks within a corresponding entity. The basic blocks such as the content providers 201f and 201h, the SAs 204f and 204h, the SMs 208f and 208h, the bidirectional networks 223f and 223h, and the broadcast networks 222f and 222h are described with reference to FIG. In this case, '-f' and '-h' are used to distinguish entities belonging to the visited network 200f belonging to another service provider and the home network 200h belonging to the home service provider. Logical entities that perform operations related to roaming are Mobility Management blocks (hereinafter referred to as MM blocks) 240f and 240h inside SMs 208f and 208h. The MM block 240 is responsible for roaming requirements processing and terminal user authentication from the terminal 119 located in the home network 200h or moved to the visited network 200f.

3 is a flowchart illustrating the operation of a receiver according to an embodiment of the present invention. Here, the receiving terminal has a function of accessing a bidirectional network. In addition, the MM block of another service provider recognizes that the terminal is located in the visited network. The ESG of another service provider is transmitted to the 'free air' so that any terminal capable of receiving a broadcast signal of another service provider can be received and interpreted.

Referring to FIG. 3, in step 300, the UE moves from a network to which the UE belongs (ie, a home network) to a visited network of another service provider and receives an ESG of another service provider. In step 301, the terminal determines whether a desired service is provided from a visited network of another service provider based on the ESG, and then determines a roaming type according to whether the service is provided in the visited network. In this case, the desired service has the same content or different content as the service received in the home network before roaming. When the desired service is provided in the visited network, it corresponds to user roaming. In step 302, the terminal sends a user roaming request message to another service provider.

The terminal receives a response message to the user roaming request message in step 303, and determines whether roaming service for the terminal is allowed in the visited network according to the response message in step 304. If the roaming service is provided, the terminal sends a confirmation message in step 305, and in step 306, the terminal receives an access key from the other service provider to access broadcast data of the desired service, and then in step 307. By using the desired service is provided from the other service provider. In this case, the response message for providing the roaming service includes billing information according to the use of the visited network. On the other hand, if the provision of the roaming service is not permitted in step 304, the procedure ends.

On the other hand, if the desired service is not provided in the visited network in step 301, it corresponds to service roaming. In step 308, the terminal is located in the visited network and receives the desired service from a home service provider. do. The terminal sends a service roaming request message to another service provider in step 308 and receives a response message for the service roaming request message in step 309. In step 310, the terminal checks the contents of the response message, and when the provision of the desired service is permitted in the visited network, the terminal sends a confirmation message in step 311. The response message for providing the roaming service includes billing information according to the use of the visited network.

After sending the confirmation message, the terminal can be provided with a service list indicating available service information for the roaming user from the home service provider through the other service provider in step 312. Based on service information, a desired service is selected and notified to the other service provider. The selected service may have the same content or different content as the service that the terminal wants to receive in step 301 to determine the roaming type. In step 314, the terminal receives the desired service through the other service provider or through the bidirectional network. The available service information may be provided through the ESG or in a form similar to that of the ESG, and may include access parameters (eg, an access key) for use of each service.

4 illustrates a message flow on the visited network side according to an embodiment of the present invention. Most operations on the visited network side occur in the MM block (hereinafter referred to as a visited MM block), and thus are shown here centering on the operation of the visited MM block.

Referring to FIG. 4, in step 400, the visited MM block receives a roaming request message from the terminal and analyzes the roaming request message in step 401 to determine a roaming type. If the roaming type indicated by the roaming request message is user roaming, in step 402, the visited MM block may request an authentication request for a user of the terminal to a home service provider, that is, an MM block of a home service provider (hereinafter referred to as a home MM block). Send to When receiving a response to the authentication request from the home service provider in step 403, in step 404, the visited MM block sends a response to the roaming request message to the terminal and waits for a confirmation message from the terminal. After receiving the confirmation message from the terminal in step 405, in step 406, the visited MM block transmits a key for service access in the terminal.

On the other hand, if the roaming type indicated by the roaming request message is service roaming, in step 407, the visited MM block sends an authentication request for a user of the terminal to a home service provider. When receiving a response to the authentication request from the home service provider in step 408, in step 409, the visited MM block sends a response to the roaming request message to the terminal and waits for an acknowledgment message from the terminal.

After receiving the confirmation message from the terminal in step 410, in step 411 or 416 between the visited MM block and the MM block of the home service provider (hereinafter referred to as the home MM block), and the bidirectional network in which the service will be provided, Resource allocation negotiation works. Through the resource allocation negotiation operation, the three entities exchange and receive information indicating a quality of service (QoS) for providing a service to a roaming user and resource allocation information for transmission, and actually transmit a service. You will share the parameters to create a route. The resource allocation negotiation may be performed in step 411 before the terminal determines the desired service or in step 416 after the terminal determines the desired service. The detailed flow of the resource allocation negotiation is not described in detail because it departs from the gist of the present invention.

In step 412, when the visited MM block receives service information available for the roaming user from the home MM block, the visited MM block delivers the available service information to the terminal in step 413. In step 414, the visited MM block receives the service information selected by the terminal based on the available service information, and transmits the service information to the home MM block in step 415. FIG.
After the aforementioned resource allocation negotiation operation is performed, the services indicated by the service information delivered from the home MM block in steps 417 and 418 are provided to the terminal from another service provider through a bidirectional network. Steps 417 and 418 are performed when the services selected by the terminal are transferred from another service provider to the bidirectional network. When the services are directly transferred from the home service provider to the bidirectional network, steps 417 and 418 are performed. Is omitted.

5 is a view showing the structure of a transmitter according to an embodiment of the present invention. Only entities that perform logical functions related to the preferred embodiment of the present invention are shown here in the SMs of the visited and home networks.

Referring to FIG. 5, the ESG entity 542 inside the SM 508 is responsible for creating and transmitting an ESG, and the Service Configuration & Source Allocation entity 544 is a service configuration and network resource. The role of assignment, and the security / service protection provision entity 546 is responsible for security and authentication, service protection, service provisioning. The three entities 542-546 are connected to the MM block 540 to perform the functions required for roaming. The MM block 540 performs tasks related to the mobility of the terminal, particularly the roaming service. The role of the MM block 540 is as follows.

-Roaming proposal reception and roaming response of the terminal

MM block and user authentication signaling of another service provider

Maintain basic information and billing information

Communication with other entities for roaming in SM

6 is a diagram showing the structure of a receiver according to a preferred embodiment of the present invention. The receiver 600 refers to a terminal having an interactive adapter 604 capable of connecting to a bidirectional network as well as a broadcast receiver 602 capable of receiving a broadcast signal from a broadcast network. Roaming related signals from the devices 602 and 604 are sent to the MM block 608, where the MM block 608 performs tasks related to service subscription to handle roaming related tasks as mentioned in FIG. It is connected to a subscription management block (610) in charge and a content consumption (612) for providing a broadcast service to a user, and transmits roaming-related signals to the bidirectional network by the bidirectional converter (604).

7A and 7B illustrate a message flow diagram according to an embodiment of the present invention. Here, signaling between the visited network and the terminal is performed through a bidirectional network.
As illustrated, the terminal receives an ESG of another service provider from an MM block (hereinafter referred to as a visited MM block) in an SM block belonging to another service provider through a broadcast network in a visited area belonging to the visited network [1] [2 ]. The ESG is not intended for roaming users, but generally refers to ESGs broadcasted through a broadcast network, and the terminal determines a roaming type based on available service information included in the ESG [2-1].

If it is determined in the [2-1] step that the user roaming, as shown in Figure 7a the terminal transmits the user roaming request message to other service providers through the bidirectional network [3-1] [4-1]. In this case, the user roaming request message may include service information indicating a service desired by the terminal. The visited MM block of another service provider sends an authentication request of the terminal that has applied for roaming to a home service provider [5-1]. If the terminal is authenticated from the home service provider [6-1], the visited MM block transmits a roaming response message to the terminal through a bidirectional network [7-1] [8-1]. The terminal sends a confirmation message for the roaming response message to the visited MM block [9-1] [10-1]. After receiving the confirmation message, the visited MM block transmits a key for service access to the terminal through a bidirectional network so that the terminal can receive the desired service [11-1] [12-1]. By using the key, the terminal can access the desired service provided through the broadcast network from a service application (SA) block of another service provider [13-1] [14-1].

On the other hand, when the roaming type determined in the step [2-1] is service roaming, the UE transmits the service roaming request message to other service providers through the bidirectional network as shown in FIG. 7B [3-2] [4-2]. The visited MM block of another service provider performs user authentication through signaling with an MM block (hereinafter, referred to as a home MM block) of a home service provider [5-2] [6-2], and roams if the user authentication succeeds. The response is transmitted to the terminal through the bidirectional network [7-2] [8-2] and a confirmation message is received from the terminal [9-2] [10-2].

After the confirmation message is received, a resource allocation negotiation operation is performed between the home MM block, the visited MM block, and the bidirectional network in step [11-2] or step [17-2]. Meanwhile, after the user authentication is performed, the home MM block informs the visited MM block of the available service information for the roaming user [12-2], and the visited MM block delivers the available service information to the terminal through the bidirectional network. [13-2]. The terminal selects a desired service based on the available service information and transmits the selected service information indicating the selected service to the visited MM block [14-2], and the visited MM block delivers the selected service information to the home MM block. [15-2].

The home MM block delivers the selected service information to the SA of the home service provider responsible for actual service delivery [16-2]. When the home service provider transmits the selected service to the terminal directly through the bidirectional network without going through other service providers, the entry point information of the bidirectional network and the terminal information are delivered to the SA in step [16-2]. Can be. The home service provider transmits the selected service to the terminal through a bidirectional network [18-1] [18-2]. In this case, for example, a home service provider sends the selected service to another service provider and another service provider sends the selected service to a terminal through a bidirectional network [18-1], or the home service provider does not go through a visiting network. The selected service is provided to the terminal through [18-2].

Tables 1 to 6 below are fields of each message shown in FIGS. 7A and 7B. The order and specific names of the following message fields are not limited to the following description, and some of them may be included as optional.

Roaming requirements name Explanation Roaming Request Id Identifier for Roaming Request Message Roaming type Identifier for roaming type; User or service User ID User identifier Home network ID Identifier of the network to which the terminal belongs Service ID Identifier of the service that the terminal wants to receive * In service roaming, this means information of available home services.

Certification requirements name Explanation Authentication request ID Identifier for authentication request message User ID User identifier Visit network ID Identifier of the network where the terminal is located Roaming type Roaming service desired by the user; user roaming or service roaming

Authentication response name Explanation Authentication response ID Identifier for Authentication Response Message Certification result Whether roaming request from the terminal has been accepted

Roaming response name Explanation Roaming Response ID Identifier for Roaming Response Message Roaming type Roaming Type Identifier: User or Service Roaming results Whether roaming requests have been accepted fee According to the billing information

Confirm Name Description Confirm ID Identifier for confirm message Agree or not Confirm information to MM

Service selection name Explanation Service selection ID Identifier for Service Selection Message Service ID Identifier for the service that the terminal wants to receive

In another embodiment described below, when a negotiation is made between a home service provider and another service provider or when an authentication procedure is not required between different networks, the user may skip the authentication procedure and perform user roaming or service roaming. do. By omitting the authentication procedure, the user can perform a faster roaming.

8 is a flowchart illustrating the basic operation of a receiver according to another embodiment of the present invention.

Referring to FIG. 8, in step 800, the terminal receives a service from a network (ie, a home network) to which the terminal belongs. In step 801, the terminal receives handover related information from a home service provider of the home network. The handover related information includes roaming related information indicating whether an authentication procedure is required during roaming in addition to typical handover related information.

Previously known ETSI TR 101 211 Digital Video Broadcasting (DVB); Referring to the Guidelines on implementation and usage of Service information (SI), when the user needs additional information, the network informs the terminal of the additional information through a linkage descriptor. At this time, the home service provider utilizes a reserved but unused part of a handover type (hand-over_type) in the linkage descriptor, so that the terminal is not authenticated. Roaming-related information indicating that the service provider can use the service may be informed to the terminal. Specific examples of the detailed description of the linkage are shown in Table 7 below.

Here, "private_data_byte" is set to '0' when instructing roaming requiring authentication and '1' when instructing roaming which does not require authentication. Description of other information fields not related to roaming related information will be omitted.

The format of Table 7 is merely an example of use, and the above solution does not limit the scope of the present invention. In another embodiment, when the terminal can use the bidirectional network, the terminal requests information necessary for the bidirectional network (especially roaming related information) through the home service provider or directly, and the home service provider uses the bidirectional network or The roaming related information may be transmitted to a terminal through a broadcast network.

In step 802, the terminal determines the current location. If it is moved to the visited network, step 803 is performed. If not, the flow returns to step 800 to continue receiving the service. In step 803, the terminal roams to the visited network based on the roaming related information given in step 801. In this case, the terminal may perform only a frequency tuning operation for accessing the visited network by identifying a changed frequency and a transport stream (TS) without performing an authentication operation with reference to the roaming related information. Can be. In step 804, the terminal continuously receives the selected service at the adjusted frequency.

9 is a flowchart illustrating an operation of a transmitter according to another embodiment of the present invention. As a transmitter transmits a service (900), service roaming and user roaming of terminals receiving the service in a corresponding network are performed. Roaming related information is sent to support (901). Herein, the roaming related information refers to the handover related information and / or information requested by the terminal as described in FIG. 8 and <Table 7>, and whether the terminal can use a service from another service provider without authentication. Indicates whether or not.

10 is a diagram illustrating a message flow according to another embodiment of the present invention.

Referring to FIG. 10, while receiving a service selected by a user in a home network belonging to a home service provider, the terminal receives roaming related information from an MM block of the home service provider [2]. Processes [1] and [2] are not necessarily sequentially performed. When roaming related information is transmitted through PSI (Program Specific Information) / SI (Service Information), which is control information related to the service, service reception and Receipt of roaming related information may occur simultaneously.
When the terminal leaves the home network and enters a visited network belonging to another service provider, the terminal performs user roaming or service roaming to the visited network without authentication based on the roaming related information. Thereafter, the terminal connects and receives a service selected by a user provided from a home service provider or another service provider [3].

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.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, a mobile terminal receives an electronic service guide (ESG), determines a roaming type, and is provided with user roaming and service roaming, so that a desired service can be normally received even in a visited network instead of the home network to which the terminal is subscribed. To help.

Claims (36)

A roaming service method for a terminal in a digital broadcasting system, Receiving an electronic service guide (ESG) from the visited network after the terminal enters the visited network from the home network; Determining a roaming type as either user roaming or service roaming based on whether the broadcast service desired to be received at the terminal is provided by the visited network based on the received ESG; If the user roaming is determined, receiving the broadcast service to be received from the visited network; And if the service roaming is determined, receiving the broadcast service to be received from the home network through the visited network. The method of claim 1, further comprising: when the user roaming is determined, sending a user roaming request message indicating the user roaming to the visited network and receiving a response message from the visited network from the visited network; , Sending a confirmation message to the visited network if the visited network is allowed to receive the broadcast service according to the response message; And after receiving the confirmation message, receiving an access key for using the broadcast service to be received from the visited network. The roaming service method of claim 2, wherein at least one of the user roaming request message, the response message, and the confirmation message belongs to the visited network and is transmitted through a bidirectional network to which the terminal is accessible. The method of claim 1, further comprising: when the service roaming is determined, sending a service roaming request message indicating the service roaming to the visited network, and receiving a response message from the visited network from the visited network; , Sending a confirmation message to the visited network if the visited network is allowed to receive the broadcast service according to the response message; And performing a resource allocation negotiation for the delivery of the broadcast service to be received between the home network and the visited network after transmitting the confirmation message. 5. The roaming service method of claim 4, wherein at least one of the service roaming request message, the response message, and the confirmation message belongs to the visited network and is transmitted through a bidirectional network to which the terminal is accessible. The roaming service method of claim 1, wherein the broadcast data of the broadcast service to be received is received from the home network through a bidirectional network belonging to the visited network and to which the terminal is accessible. . The roaming service method of claim 1, wherein when determined as the service roaming, broadcast data of the broadcast service to be received is received from the home network through a broadcast network belonging to the visited network. The method of claim 1, further comprising: receiving, through the visited network, service information available for a roaming user from the home network when determined to be roaming service; And selecting the broadcast service to be received based on the available service information and informing the visited network to the visited network. The method of claim 1, further comprising: receiving roaming-related information from the home network indicating whether to perform user authentication when roaming to the visited network; When the roaming related information indicates not to perform user authentication, roaming further comprising performing roaming to the visited network between the home network and the visited network without user authentication for the terminal. Service method. A roaming service method for a terminal in a digital broadcasting system, Receiving a roaming request message from the terminal entering the visited network from a home network and determining whether the roaming type indicated by the roaming request message is user roaming or service roaming; Providing the broadcast service that the terminal intends to receive from the visited network to the terminal when the user roams; And if the service roaming is determined, receiving the broadcast service to be received from the home network and providing the broadcast service to the terminal. The method of claim 10, further comprising: transmitting a response message indicating that the user roaming is allowed to the terminal when the user roaming is determined; And receiving an acknowledgment message from the terminal after transmitting the response message, further comprising providing the terminal with an access key for using the broadcast service to be received. The roaming service method of claim 11, wherein at least one of the roaming request message, the response message, and the acknowledgment message belongs to the visited network and is transmitted through a bidirectional network to which the terminal is accessible. The method of claim 10, further comprising: transmitting a response message indicating that the service roaming is allowed to the terminal when the service roaming is determined; Roaming further comprising: performing a resource allocation negotiation for the delivery of the broadcast service to be received between the home network and the visited network when receiving a confirmation message from the terminal after transmitting the response message; Service method. The roaming service method of claim 13, wherein at least one of the roaming request message, the response message, and the acknowledgment message belongs to the visited network and is transmitted through a bidirectional network to which the terminal is accessible. The roaming service method of claim 10, wherein when the service roaming service is determined, broadcast data of the broadcast service to be received is transmitted from the home network through a bidirectional network that belongs to the visited network and is accessible to the terminal. . The roaming service method of claim 10, wherein, when it is determined that the service roams, broadcast data of the broadcast service to be received is transmitted from the home network through a broadcast network belonging to the visited network. The method of claim 10, further comprising: transmitting the service information available for the roaming user from the home network to the terminal through the visited network when it is determined that the service roaming; And the visited network is notified from the terminal of the broadcast service to be received selected by the terminal based on the available service information. The method of claim 10, further comprising: transmitting roaming related information from the home network to the terminal indicating whether to perform user authentication when roaming to the visited network; When the roaming related information indicates not to perform user authentication, roaming further comprising performing roaming to the visited network between the home network and the visited network without user authentication for the terminal. Service method. In a roaming service device of a terminal in a digital broadcasting system, A broadcast receiver connected to a broadcast network to receive data and signaling signals of a broadcast service; A bidirectional converter connected to the bidirectional network connected to the broadcasting network to transmit and receive signals related to the roaming service; When the terminal enters the visited network from the home network, based on an electronic service guide (ESG) from the visited network received through the broadcast receiver, it is determined whether a broadcast service to be received at the terminal is provided in the visited network. The roaming type is determined by one of user roaming and service roaming, and when the user roaming is determined, the broadcast receiver is controlled to receive the broadcast service to be received from the visited network. And a mobility management (MM) block controlling the bidirectional converter to receive the broadcast service to be received from the home network through the visited network. The method of claim 19, wherein the mobility management block, If it is determined that the user roams, the user roaming request (proposal) message indicating the user roaming to the visited network and the response message to the user roaming request message from the visited network, receiving the response message according to the response message When the provision of the desired broadcast service is allowed in the visited network, a confirmation message is sent to the visited network, and after the confirmation message is transmitted, an access key for using the broadcast service to be received is received from the visited network. Roaming service device. The roaming service device of claim 20, wherein at least one of the user roaming request message, the response message, and the confirmation message belongs to the visited network and is transmitted through the bidirectional network to which the terminal is accessible. The method of claim 19, wherein the mobility management block, If it is determined that the service roaming, after receiving a service roaming request (proposal) message indicating the service roaming to the visited network and receives a response message to the service roaming request message from the visited network, Send a confirmation message to the visited network if the visited network is permitted to provide the broadcast service to be received according to the response message; And a resource allocation negotiation for delivering the broadcast service to be received between the home network and the visited network after transmitting the confirmation message. The roaming service device of claim 22, wherein the service roaming request message, the response message, and the confirmation message belong to the visited network and are transmitted through a bidirectional network to which the terminal is accessible. 20. The roaming service device of claim 19, wherein the broadcast data of the broadcast service to be received is received from the home network through a bidirectional network belonging to the visited network and accessible by the terminal when the service roaming is determined. . 20. The roaming service device of claim 19, wherein, when it is determined that the service roams, broadcast data of the broadcast service to be received is received from the home network through a broadcast network belonging to the visited network. The method of claim 19, wherein the mobility management block, If determined to be roaming service, receive service information available for the roaming user from the home network via the visited network, Roaming service device, characterized in that for selecting the broadcast service to receive based on the available service information to notify the visited network. The method of claim 19, wherein the mobility management block, When roaming related information is received from the home network indicating whether to perform user authentication when roaming to the visited network, and the roaming related information indicates not to perform user authentication, the home network and the visited network Roaming to the visited network without user authentication for the terminal. A roaming service device for a terminal in a network of a digital broadcasting system, A home network to which the terminal capable of receiving broadcast services is subscribed; Receive a roaming request message from the terminal entering the visited network from the home network and determines whether the roaming type indicated by the roaming request message is user roaming or service roaming, and if the user roaming is determined to be received by the terminal A roaming service device providing a broadcast service to the terminal from the visited network and receiving the broadcast service to be received from the home network and providing the broadcast service to the terminal when the service roaming is determined; . 29. The system of claim 28, wherein the visited network is If it is determined that the user roaming, a response message indicating that the user roaming is allowed to the roaming request message is sent to the terminal, And receiving an acknowledgment message from the terminal after transmitting the response message, providing a terminal with an access key for using the broadcast service to be received. The roaming service device of claim 29, wherein at least one of the roaming request message, the response message, and the confirmation message belongs to the visited network and is transmitted through a bidirectional network to which the terminal is accessible. 29. The system of claim 28, wherein the visited network is If it is determined that the service roaming, a response message indicating that the service roaming is allowed to the roaming request message is sent to the terminal, And receiving a confirmation message from the terminal after transmitting the response message, and performs a resource allocation negotiation for the delivery of the broadcast service to be received between the home network and the home network. 32. The roaming service device of claim 31, wherein at least one of the roaming request message, the response message, and the confirmation message belongs to the visited network and is transmitted through a bidirectional network to which the terminal is accessible. 29. The roaming service device of claim 28, wherein when determined as the service roaming, broadcast data of the broadcast service to be received is transmitted from the home network through a bidirectional network belonging to the visited network and accessible by the terminal. . 29. The roaming service device of claim 28, wherein the broadcast data of the broadcast service to be received is transmitted from the home network through a broadcast network belonging to the visited network when determined as the service roaming. 29. The system of claim 28, wherein the visited network is If it is determined that the service roaming, the service information available for the roaming user from the home network is transmitted to the terminal, and the broadcast service to be received selected by the terminal based on the available service information is received from the terminal. Roaming service device characterized in that the notification. The method of claim 28, wherein the home network, Transmitting roaming related information indicating whether or not to perform user authentication when roaming to the visited network; And when the roaming related information indicates not to perform user authentication, roaming to the visited network without performing user authentication for the terminal with the visited network.

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