KR100557151B1 - Broadcast Service Controller Search Method in Mobile Communication System - Google Patents

Abstract

The present invention is a method for finding a broadcast service controller when a mobile terminal moves and is located in another operator's network in a mobile communication system including two or more broadcast service controllers, which is set in advance when the mobile terminal moves to another operator's network. Accessing a broadcast service controller of a home network and transmitting location information; and searching for a broadcast service controller of a visited network by using the location information received from the mobile terminal by the broadcast service controller of the home network, and receiving the received location. And transmitting information, and searching for the home network broadcasting service connected to the location information by receiving the location information by the broadcast service controller of the visited network.

Broadcast service controller, packet data service node, location information, SID

Description

Broadcasting service controller search method in mobile communication system {METHOD FOR SEARCHING BCMCS CONTROLLER IN MOBILE COMMUNICATION SYSTEM}

1 is a block diagram showing the structure of a system for a broadcast service according to an embodiment of the present invention;

2 is a flowchart illustrating a procedure for discovering a broadcast service controller according to a first embodiment of the present invention;

3 is a flowchart illustrating a procedure for discovery of a broadcast service controller according to a second embodiment of the present invention.

The present invention relates to a broadcast service method in a mobile communication system, and more particularly, to a method for finding a broadcast service controller when a mobile terminal moves to receive a broadcast service.

Recently, the communication environment is rapidly changing as it goes beyond the wired and wireless domains and the regional and national divisions. In particular, mobile communication environments, such as the International Mobile Telecommunication 2000 (IMT-2000), tend to be constructed to provide a real-time and comprehensive environment for various information required by users as well as video and audio. In addition, the development of a mobile communication system is not only a voice communication in a cellular phone (PCS) or a personal communication system (PCS), but also wirelessly using a mobile station (MS) as well as transmitting text information. It is being developed to provide broadcasting / multiple services (hereinafter referred to as broadcasting service) such as high-speed packet data service and moving picture.

In general, a mobile communication system communicates with one mobile terminal in a unicast manner to transmit packet data. 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 mobile communication system, a service is provided by the single transmission scheme in order for different users to simultaneously receive the same service. However, since the single transmission scheme provides a service by allocating a band for each user, it causes a waste of resources and a system load in a network and a wireless section.

Meanwhile, when providing a broadcast service, an operator provides a service by integrating a BCMCS controller and a broadcast server into a packet data service network in the existing code division. In this case, the operator installs a plurality of packet data service nodes (PDSNs) and broadcast service controllers in a network, and different broadcast service controllers are located in different regions. In this case, the broadcast content server controller is capable of heterogeneous services for each region, and services are available only after receiving session information on a service of a new region. Therefore, the mobile terminal should find a broadcast service controller in the access network when moving to another area. A technique for finding such a broadcast service controller is a technology proposed in the current standard, and includes a domain name service (DNS) and a dynamic host configuration (DHCP).

However, the above technologies have a disadvantage of affecting the existing network structure or should be reflected in the IETF standard, and thus, a technique for easily finding a broadcast controller when the terminal moves without affecting the existing network is required.

Accordingly, an object of the present invention is to provide a method for discovering a broadcast server controller (BCMCS Controller) when a terminal moves in a mobile communication system providing a broadcast service.

The method according to the first embodiment for achieving the above object of the present invention is a method for finding a broadcast service controller when the mobile terminal is located in a home network in a mobile communication system including two or more broadcast service controllers. At the time of movement, accessing a preset broadcast service controller to transmit location information, and the preset broadcast service controller receives the location information from the mobile terminal and is in close proximity to the cell where the mobile terminal is located. It is characterized by including the process of finding the controller.

In addition, the method according to the second embodiment for achieving the objects of the present invention, in a mobile communication system comprising two or more broadcast service controller, a method for finding a broadcast service controller when the mobile terminal is located in another operator network The mobile terminal connects a broadcast service controller of a home network, which is preset when the mobile terminal moves to another provider network, and transmits location information, and the location information received from the mobile terminal by the broadcast service controller of the home network. Finding a broadcast service controller of the visited network using the step of transmitting the received location information, and the broadcast service controller of the visited network receives the location information to find a broadcast service controller operating at the current location of the mobile terminal It characterized in that it comprises a process.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention supports a broadcast service through a forward packet data channel (F-PDCH) for high-speed data transmission in a 1xEVDV (Evolution in Data and Voice) system. In particular, it supports the simultaneous service of broadcast service and dedicated service. In this case, the dedicated service means a packet data service that is performed through unicast. In addition, broadcasting / multiple services (hereinafter, referred to as broadcast services) means providing the same traffic to multiple terminals.

1 is a block diagram showing the structure of a system for a broadcast service according to an embodiment of the present invention.

Referring to FIG. 1, a mobile communication system for a broadcast service includes a plurality of base stations (BSs) 120a and 120b that wirelessly communicate with mobile stations (MSs) 110. , A packet communication network, an AAA server 150, a plurality of BCMCS controllers 160a, 160b, 160c, 160d, and a Broadcasting Service Server or Contents Server (CS) 170 It is composed of

The base stations 120a and 120b are connected to the mobile station 110 to transmit and receive broadcast data, and the base station transceivers 121a, 121b, 121c and 121d are connected to the packet communication network, and are connected to the base station transceivers 121a and 121b. Base station controllers 122a and 122b for controlling.

 The packet communication network is divided into a packet control funtion (PCF) 130a and 130b and a packet data service node (hereinafter referred to as a PDSN) 140, and the packet controller 130a and 130b. ) Are respectively connected to the base station controllers 122a and 122b to control packet data communication.

The PDSN 140 manages a user profile and establishes a point-to-point (hereinafter referred to as PPP) session with the mobile terminal 110 to provide a broadcast service to the mobile terminal 110. Here, the PDSN 140 may manage not only a broadcast service but also a user profile for a dedicated service. And the PDNS 140 is connected to the authentication server 150 in charge of authentication and billing, and authenticates the user information requested from the mobile terminal 110, the charging information for the broadcast service to the mobile terminal 110 Received from

The broadcast server 170 includes broadcast contents such as a video and a sound for a broadcast service. The broadcast data including broadcast contents are generated in the form of a compressed Internet Protocol (IP) packet and transmitted to the base station 120 through a packet communication network such as the Internet.

The plurality of broadcast service controllers (BCMCS Controllers) 160a, 160b, 160c, and 160d connected to the broadcast server 170 control communication between the broadcast server 170 and the mobile terminal 110 and provide air for a broadcast service. It performs some functions of the interface (Air-Interface) and the radio access network (RAN). Here, although only one broadcast server 170 is shown to facilitate the description of the present invention, a plurality of broadcast servers 170 may be actually connected to the broadcast service controller 160a.

As shown in FIG. 1, the plurality of broadcast service controllers 160a, 160b, 160c, and 160d may include the broadcast service controllers 160a and 160b of the home network 1 and the broadcast service controllers of the third party network 2. 160c, 160d). Therefore, the broadcast service controllers 160a and 160b of the home network 1 and the broadcast service controllers 160c and 160d of the third-party network 2 are provided with different services as different operator networks (by region). Accordingly, the mobile terminal 110 must receive session information on a service of a new area in order to receive a broadcast service when moving to another provider network.

In order to deliver the broadcast data generated by the broadcast server 170 to the PDSN 140, IP multicast or IP single transmission is used, and the PDSN 140 transmits the broadcast data to the base station 120. Conventional CDMA2000 access network technology is used for this purpose. When IP multicasting is used, the PDSN 140 forms a multicast group that receives IP multicast data from the broadcast server 170. Membership information of the multicast group is maintained by a multicast router (MR) (not shown) connected to the PDSN 140.

The IP data including the image and sound generated by the broadcast server 170 is broadcasted to a plurality of PDSNs 140 forming a multicast group or transmitted to a single PDSN 140. Each PDSN 140 transmits IP data to the base station 120 using, for example, CDMA2000 access network technology, and the base station transceivers 121a, 121b, 121c, and 121d transmit the IP data to a radio frequency ( Radio Frequency (RF) signal is converted into a form and transmitted in the corresponding service area.

An operation of the first embodiment of the present invention for finding a broadcast service controller when a mobile terminal is located in a home network in a mobile communication system having such a structure will be described with reference to the accompanying drawings.

The function proposed in the first embodiment of the present invention is an access network identifier (Access Network ID or less, ANID) in the cdma 2000 1X system after accessing the broadcast service controller 160a preset when the mobile terminal moves. (PZID (Packet Zone ID) + NID + SID (System ID)), in case of EV-DO system, the preset broadcast service controller transmits the subnet ID and SID to the cell where the mobile terminal is located. This function finds the nearest broadcast service controller.

2 is a flowchart illustrating a procedure for discovering a broadcast service controller according to a first embodiment of the present invention.

Referring to FIG. 2, in step 201, the mobile terminal 110 requests the packet data service node 140 to establish a session and receives information such as an IPCP, a PDSN IP address, etc. from the packet data service node 140, thereby receiving the packet. The session is established with the data service node 140.

When the session is established, the mobile terminal 110 HTTPs the location information (ANID / subnet ID) of the mobile terminal 110 to the IP address of the broadcast service controller 160a of the home network 1 previously set in step 202. Send it on the content request message. Then, in step 203, the broadcast service controller 160a finds the broadcast service controller 160b corresponding to the ANID / subnet ID in which the mobile terminal 110 is currently located. Thereafter, in step 204, the broadcast service controller 160a transmits an HTTP content response message including the broadcast service controller IP address to the mobile terminal 110, such as an HTTP 301 redirection code.

In step 205, the mobile terminal 110 requests the HTTP content for the request to receive the broadcast service to the IP address of the broadcast service controller received as the HTTP 301 modification code, that is, the broadcast service controller 160b corresponding to the IP address. Send a message. The broadcast service controller 160d is the closest broadcast service controller of the cell in which the mobile terminal 110 is currently located.

As described above, in the first embodiment of the present invention, a procedure for searching for a broadcast service controller when the mobile terminal is located in the home network has been described. In the second embodiment of the present invention, the mobile terminal moves and is located in another provider network. A procedure of finding a broadcast service controller will be described. Here, it should be noted that the mobile communication system according to the second embodiment of the present invention applies the structure of the mobile communication system shown in FIG. 1 as it is.

The function proposed in the second embodiment of the present invention is an ANID (PZID + NID + SID) in the case of a cdma 2000 1X system after the mobile terminal connects to a broadcasting service controller of a home network which is preset when the mobile terminal moves to another provider network. In case of EV-DO system, SID and subnet ID are transmitted to broadcasting service controller of home network. Accordingly, the broadcast service controller operating at the current location of the mobile terminal by transmitting the location information (ANID / subnet ID) of the mobile terminal by searching for a visited network, that is, a third-party network broadcast service controller that has been previously set to the SID by the broadcast service controller of the home network. Finding a controller. A procedure for searching for a broadcast service controller by applying such a function will be described with reference to the accompanying drawings.

3 is a flowchart illustrating a procedure for discovery of a broadcast service controller according to a second embodiment of the present invention.

Referring to FIG. 3, in step 301, the mobile terminal 110 requests a session establishment from the packet data service node 140 to receive information such as an IPCP, PDSN IP address, etc. from the packet data service node 140, thereby receiving the packet. The session is established with the data service node 140.

In step 302, the mobile terminal 110 transmits the location information (ANID / subnet ID) of the mobile terminal 110 in the HTTP content request message to the preset IP address of the home broadcast service controller 160a of the home network. do.

Then, in step 303, the home broadcast service controller 160a searches for the network of the operator in which the mobile terminal 110 is currently located as an SID, and is connected to the SID, that is, a preset third party network broadcast service controller (Default BCMCS Controller). Finding 160c and transmitting the HTTP request message including the location information of the mobile terminal 110 received in step 304. Accordingly, the third party network broadcast service controller 160c checks the location information (ANID / subnet ID) of the mobile terminal 110 received through the HTTP content request message, that is, the broadcast service controller connected to the location information, that is, the mobile terminal. Find the broadcast service controller 160d operating at the current location of 110.

In step 305, the home broadcast service controller 160a transmits the HTTP 301 address modification code from the third party network broadcast service controller 160c and the IP of the broadcast service controller 160d operating at the current location of the mobile terminal 110. Receive an HTTP content response message containing an address. Then, in step 306, the home broadcast service controller 160a includes the IP address of the broadcast service controller 160d operating at the current location of the mobile terminal received from the third party network in the HTTP content response message as an HTTP 301 address modification code. Transmit to mobile terminal 110.

Then, in step 307, the mobile terminal 110 modifies the address with the received IP address according to the HTTP 301 address modification code included in the HTTP content response message, and at the current position of the mobile terminal 110, the modified address. An HTTP content request message for a broadcast request is transmitted to the operating broadcast service controller 160d.

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 the equivalents of the claims.

As described above, in the present invention, the mobile terminal accesses a preset broadcast service controller when the mobile terminal moves, transmits location information of the mobile terminal, and easily moves the mobile terminal without affecting the existing network through the connected broadcast service controller. It is effective to find a broadcast service controller.

Claims (4)

A mobile communication system comprising two or more broadcast service controllers, the method for finding a broadcast service controller when a mobile terminal is located in a home network, Transmitting, by the mobile terminal, location information by accessing a preset broadcast service controller when the mobile terminal moves; And searching for a broadcast service controller proximate to a cell in which the mobile terminal is located by the preset broadcast service controller receiving location information from the mobile terminal.  The method of claim 1,  Transmitting, by the preset broadcast service controller, location information of a broadcast service controller adjacent to a cell where the mobile terminal is located to the mobile terminal; And transmitting the broadcast request message to the broadcast service controller in proximity to the cell in which the mobile terminal is located by using the received location information. A mobile communication system including two or more broadcast service controllers, the method for finding a broadcast service controller when a mobile terminal is located in another operator's network, the method comprising: Transmitting a location information by accessing a broadcasting service controller of a home network preset when the mobile terminal moves to another operator network; Transmitting, by the broadcast service controller of the home network, the broadcast service controller of the visited network by using the location information received from the mobile terminal, and transmitting the received location information; And searching for a neighboring broadcast service controller operating at a current position of the mobile terminal by receiving the location information by the broadcast service controller of the preset visited network. . The method of claim 3, Transmitting, by the preset broadcast service controller of the visited network, location information of the broadcast service controller operating at the current location of the mobile terminal to the broadcast service controller of the home network; And transmitting, by the broadcast service controller of the home network, the location information received from the preset broadcast service controller of the visited network to the mobile terminal. .

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