KR20080005050A - Apparatus and method for providing of multicast and broadcast service in a broadband communication system - Google Patents

Abstract

An apparatus and a method for providing broadcasting services in a broadband wireless communication system are provided to set a wireless section connection with a BS, transmit an MCBCS service request message to an MCBCS controller, set an MCBCS connection with the BS, and transmit a content request message to the MCBCS controller, thereby activating the wireless communication system. A method for receiving broadcasting services in a broadband wireless communication system comprises the following steps of: setting a wireless section connection for transmission between a BS(Base Station)(840) and a terminal(800)(839); transmitting an MCBCS(Multicast and Broadcast Service) service request message to an MCBCS controller(850)(817); and setting the MCBCS connection with the BS when the MCBCS service response message is received from the MCBCS controller and transmitting a content request message to the MCBCS controller(821,823).

Description

Apparatus and method for providing broadcast service in broadband wireless communication system {APPARATUS AND METHOD FOR PROVIDING OF MULTICAST AND BROADCAST SERVICE IN A BROADBAND COMMUNICATION SYSTEM}

1 is a diagram showing the configuration of a broadband wireless communication system according to an embodiment of the present invention;

2 is a diagram illustrating an entire signal flow for providing a broadcast service in a broadband wireless communication system according to a first embodiment of the present invention;

3 is a diagram illustrating a frame structure transmitted in a wireless section according to an embodiment of the present invention;

4 is a diagram illustrating a procedure of a broadcast service receiving method of a terminal in a broadband wireless communication system according to a first embodiment of the present invention;

5 is a flowchart illustrating a method of providing a broadcast service by a base station in a broadband wireless communication system according to a first embodiment of the present invention;

6 is a diagram illustrating a procedure of a broadcast service providing method of a broadcast service controller in a broadband wireless communication system according to a first embodiment of the present invention;

FIG. 7 is a flowchart of a broadcast service providing method of a content server in a broadband wireless communication system according to a first embodiment of the present invention;

8a to 8b are views illustrating an entire signal flow for providing a broadcast service in a broadband wireless communication system according to a second embodiment of the present invention.

9 is a flowchart illustrating a method of receiving a broadcast service of a terminal in a broadband wireless communication system according to a second embodiment of the present invention;

FIG. 10 is a flowchart of a broadcast service providing method of a base station in a broadband wireless communication system according to a second embodiment of the present invention; FIG.

11 is a view showing a procedure of a broadcast service providing method of a broadcast service controller in a broadband wireless communication system according to a second embodiment of the present invention; and

FIG. 12 is a flowchart of a broadcast service providing method of a content server in a broadband wireless communication system according to a second embodiment of the present invention.

The present invention relates to a broadband wireless communication system, and more particularly, to an apparatus and method for providing a static mode broadcast service.

Packet data service provided in the current mobile communication system is provided by the user in a single transmission (Unicast) method 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 corresponding user. Therefore, in the current system, services are provided in a conventional unicast manner so that different users simultaneously receive the same service. However, this method is a waste of resources between the network and the radio, and causes a load on the system.

Accordingly, a solution to the problem is a broadcast service (MultiCast and BroadCast Service: MCBCS). The broadcast service provides a desired service while saving resources to users who want to receive the same service at the same time, and can provide the same data service as before. In the broadcast service, two modes are provided, that is, a static mode and a dynamic mode.

In the static mode, broadcast content is continuously provided regardless of whether a user wants to receive a broadcast service. That is, a broadcast service is provided according to a provisioned manner by an operator. Therefore, when a user requests a broadcast service, a connection setup procedure for the broadcast service is not required. However, in the dynamic mode, when a user requests a broadcast service, a connection for a broadcast service is established, and when there is no terminal to be provided with a broadcast service under a base station for a predetermined time, the broadcast connection is set to increase resource efficiency. Done.

Conventional broadcast services can be simply classified into Digital Multimedia Broadcasting (DMB) and Broadcast Multicast Service (BCMCS) in a Code-Division Multiple Access (CDMA) network. The DMB (Digital Multimedia Broadcasting) is a broadcasting service that digitally modulates various multimedia signals such as voice and video and provides them to a fixed or portable vehicle receiver, and is based on DAB (Digital Audio Broadcasting), a technology for digital radio. The broadcast concept has been added to send additional data such as video, weather, news and location. In addition, high-quality and high-definition broadcasting can be enjoyed through a personal portable terminal or a vehicle terminal on the go, and thus has been attracting attention as a next generation broadcast.

The DMB is largely divided into terrestrial DMB and satellite DMB. The terrestrial DMB transmits a program using the VHF channel 12 and the military channel 8 currently empty on the ground, and transmits a broadcast signal through the ground base station. The terrestrial DMB has a merit that the broadcast is provided to the user free of charge, but there are limitations in the number of broadcast channels, and there is a disadvantage in that the service is provided in a poor environment such as the basement. On the other hand, the satellite DMB uses a satellite, and the satellite DMB broadcasting center transmits the program to the satellite takes the form that the satellite is sprayed on the DMB terminals nationwide. The satellite DMB is superior to the terrestrial DMB in terms of the number of broadcast channels and the provision environment, but has a disadvantage of being a paid service.

The BCMCS in the code-division multiple access (CDMA) network uses the concept of broadcast service described above. Although it is possible to provide static / dynamic mode of service at present, since the acceleration of the CDMA market is slow, it does not provide a broadcast service.

Therefore, there is a need for a new method for providing a broadcast service in a broadband wireless communication system.

Accordingly, an object of the present invention is to provide an apparatus and method for providing a broadcast service in a broadband wireless communication system.

According to an embodiment of the present invention to achieve the above object, a broadcast service receiving method of a terminal in a broadband wireless communication system, the process of establishing a wireless section connection for the transmission of the broadcast content and the base station, and the broadcast service controller MCBCS (Multicast) and Broadcast Service: hereinafter referred to as 'MCBCS') a process of transmitting a MCBCS Service Request message, and when an MCBCS Service Response message is received from the broadcast service controller, the base station and the MCBCS connection is established. Setting and transmitting a Content Request message to the broadcast service controller.

According to an embodiment of the present invention to achieve the above object, a broadcast service providing method in a base station of a broadband wireless communication system, a burst for a specific multicast and broadcast service (MCBCS) burst from a broadcast service controller When a reservation reservation message is received, allocating the requested specific MCBCS burst as an MCBCS traffic transmission interval, and setting up a wireless interval connection for delivery of the terminal and broadcast content. It is characterized by.

According to an exemplary embodiment of the present invention, a broadcast service providing method in a broadcast service controller of a broadband wireless communication system includes: when a broadcast content property and content are received from a broadcast service content provider, the received broadcast content property; And a process of generating a service guide using content, and when the MCBCS service request message is received from the terminal, the generated service guide to the terminal. And transmitting a MCBCS Service Response message including a message, and transmitting a corresponding content to the terminal when a Content Request message is received from the terminal.

In order to achieve the above object, according to an embodiment of the present invention, a broadcast service providing apparatus of a broadband wireless communication system establishes a wireless section connection with a base station and calls a multicast and broadcast service (MCBCS) as a broadcast service controller. ) Performs a service request (MCBCS Service Request) to receive a service guide, and performs a content request (Content Request) to the broadcast service controller to receive a key for content decryption, and establishes an MCBCS connection with a base station to the broadcast service A terminal receiving content from a controller, a base station for allocating a specific MCBCS burst as an MCBCS traffic transmission interval for the terminal, and establishing a wireless section connection and an MCBCS connection with the terminal, and received from a broadcast service content provider Create a service guide using the broadcast content properties and content, After assigning a specific MCBCS burst to the terminal by controlling the base station, and transmits the generated service guide to the terminal according to the MCBCS Service Request of the terminal, the content according to the content request of the terminal And a broadcast service controller for generating a content decryption key according to the present invention and transmitting the generated content decryption key to the terminal.

According to another embodiment of the present invention to achieve the above object, a broadcast service receiving method of a terminal in a broadband wireless communication system, the process of establishing a wireless section connection for the transmission of the broadcast content and the base station, and the MCBCS (broadcast service controller) Multicast and Broadcast Service: hereinafter referred to as 'MCBCS') a process of transmitting a MCBCS Service Request message, and when an MCBCS Service Response message is received from the broadcast service controller, the broadcast service controller And transmitting a content request message.

According to another exemplary embodiment of the present invention, a frame structure for a broadcast service includes a multicast and broadcast service (MCBCS) map (MAP) message in a first section of an i-th frame. Includes the MCBCS map (MAP) message including the address information of the address, the address information of the MCBCS burst in the second section of the i-th frame, and comprises the MCBCS burst in the i + a-th frame Characterized in that.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when 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.

Hereinafter, an apparatus and method for providing a broadcast service in a broadband wireless communication system will be described.

1 is a block diagram of a broadband wireless communication system according to an exemplary embodiment of the present invention. Here, the broadband wireless communication system is a terminal 100, a base station 110, a base station controller 120, a content server (Content Server) 130, a broadcast service controller (MCBCS Controller) 140, billing authentication server (AAA) server 150, and a content provider 160.

Referring to FIG. 1, the content provider 160 generates content for an actual broadcast service broadcast to the terminal 100, and generates the generated content to the content server 130. To provide. The AAA server 150 is connected to the content server 130 and manages billing and authentication information of the terminal 100 requesting a broadcast service.

The content server 130 stores broadcast content provided by the content provider 160 and serves as an application server for providing a broadcast service. In addition, the content server 130 manages a broadcast service user, generates a service guide including various information such as a broadcast schedule, broadcast content, and producer, and encrypts and charges the broadcast content.

The broadcast service controller (MCBCS Controller) 140 may exist in the base station controller 120, manage a broadcast service zone (MCBCS Zone), multicast connection ID (Multicast Connection ID: Multicast CID) and broadcast service burst Allocates and manages allocation information accordingly. In addition, the broadcast service controller (MCBCS Controller) 140 performs packetization for data synchronization between the base stations 110 and time stamping for time synchronization.

The base station 110 loads the broadcast content in the broadcast service burst allocated from the broadcast service controller (MCBCS Controller) 140 and transmits the broadcast content to the terminal 100 located in the cell that is in charge thereof.

Here, the control message path and the traffic forwarding path between each network member specified in FIG. 1 will be described as follows. First, referring to the traffic forwarding path, the content is generated by the content provider and stored in the content server, and is transmitted to the one or more base stations by packetization and time stamping by the broadcast service controller in the one or more base station controllers. Broadcast by the base stations to the terminals in the broadcast service zone. Here, the content server generates and transmits a control message to the broadcast service controller to control the network members of the traffic path, and the broadcast service controller generates and transmits a control message to control the base stations, and the base stations broadcast. A control message is generated and transmitted to control the terminals in the service zone.

2 is a diagram illustrating an entire signal flow for providing a broadcast service in a broadband wireless communication system according to a first embodiment of the present invention.

Referring to FIG. 2, the content server 260 receives a content file from a content provider and stores the content file in its own file store, and in step 201 uses a content guide received from the content provider. After the generation, the generated service guide is transmitted to the broadcast service controller 250 in the base station controller in step 203. Here, the service guide includes content schedule information as well as content provider information as well as broadcast schedule information.

Here, <Table 1> is a table showing the information included in the service guide and an example thereof.

Zone ID Information value Explanation File 1 Content ID 0x0001 Content identification number Channel ID MBC Channel number on which content is broadcast Content name 9:00 News Broadcast name passed to user Start time 21: 00: 00: 00 Broadcast start time Transfer time 00: 52: 00: 00 Broadcast transmission time Multicast IP Address 0xMBC_IP Multicast IP address of the terminal receiving the content Multicast Connection Identifier CID_MBC-news Multicast connection identifier for the terminal to decode the broadcast service burst of the content Start frame number 1200 Frame number transmitted by the broadcast service controller to all base stations in the zone for time synchronization Burst Allocation Information Symbol offset, subchannel offset, number of symbols, number of subchannels, repetition, allocation period Broadcast service burst allocation information for content, allocation cycle Packet size 1500 bytes Packetization size to be transmitted in broadcast service burst frame Billing Information 500 won Billing information for this content File 2 … … …

In step 205, the broadcast service controller 250 manages a broadcast service zone (MCBCS zone) for the base stations 240 managed by the broadcast service controller 250. That is, it performs the operation information and maintenance of the base station 240 that it manages. In addition, the broadcast service controller 250 allocates broadcast service bursts to the base stations 240 based on the service guide received from the content server 260 in step 207, and generates broadcast service burst assignment information. In the step, a multicast connection identifier (Multicast CID) is allocated to each content and managed.

Thereafter, the broadcast service controller 250 transmits a burst reservation request message including the broadcast service burst allocation information to the base station 240 in step 211, thereby bursting a downlink frame for the broadcast service. Request to allocate a (Downlink frame burst). Here, the burst reservation request message includes a broadcast service burst frame offset (MCBCS Burst Frame Offset), a next broadcast service frame offset (Next MCBCS Frame Offset), and a next broadcast service OFDMA (Othogonal Frequency Division Mdulation / Multiplexing Access): The following MCBCS OFDMA Frame Offset information is included.

Subsequently, each of the base stations 240 receiving the burst reservation request message allocates a broadcast service traffic transmission interval through which broadcast content can be transmitted according to the request, and the broadcast is transmitted in step 213. The burst reservation ACK response message is transmitted to the service controller 250. That is, a reservation is made for a frame burst of the base station that has been requested to be allocated, and a completion message for the reservation is transmitted.

Then, when the terminal 200 receives a broadcast service request by the user in step 217, the terminal 200 sends a broadcast service request (MCBCS Service Request) message including user profile information to the content server 260. send. In this case, the content server 260 performs a user authentication procedure for checking whether the service is an authorized user for the terminal 200 using the user profile information in step 219, and when the user authentication is completed, A service registration procedure of storing user information in a database is performed to provide a broadcast service to the terminal 200. In step 221, the content server 260 transmits a broadcast service response (MCBCS Service Response) message to the terminal 200. The MCBCS Service Response message may include a service guide including user information (Content information, schedule information), a user ID (ID), a channel, and the like provided from a corresponding broadcasting zone. A mapped multicast IP address is included.

After receiving the message, the terminal 200 establishes a broadcast service connection for transmitting broadcast service traffic with the base station 240 in step 223 and sets program information of the service guide by the user. When the content to be received through is selected, in step 225, the content server 260 transmits a content request message including the selected content information and a user ID.

In this case, the content server 260 performs encryption on the corresponding content in step 227, generates a content protection key for decrypting the encrypted content, and proceeds to step 229 to generate the content. A content response message including the encrypted content protection key is transmitted to the terminal 200. In step 231, the content server 260 transmits the encrypted contents to the broadcast service controller 250.

After that, the broadcast service controller 250 performs packetization for data synchronization on the encrypted contents received from the content server 260 in step 233, and performs time synchronization in step 235. After time stamping is performed, the process proceeds to step 237 and transmits the packetized and time stamped content to the terminal 200.

In step 239, the terminal 200 transmits a contents delivery report message indicating the end of reception to the contents server 260. Here, the content reception report message includes billing data. For example, the billing data includes information on a user ID, content information, broadcast reception time, and the like. If a part of the received content is not normally received, the terminal 200 may request retransmission to the content server 260.

In step 241, the content server 260 charges the broadcast service based on the information included in the message, and in step 243, an ACK response to the content reception report to the terminal 200. A Delivery Ack) message is sent to inform the end of a successful broadcast service.

4 is a flowchart illustrating a method of receiving a broadcast service of a terminal in a broadband wireless communication system according to a first embodiment of the present invention.

Referring to FIG. 4, when a user is requested to receive a broadcast service, the terminal 200 transmits a broadcast service request (MCBCS Service Request) message to the content server 260 in step 403. Here, the broadcast service request message is a message for requesting registration of a broadcast service in order for the terminal 200 to receive a broadcast service provided in a corresponding broadcast zone. The message includes user profile information.

In step 405, the terminal 200 checks whether a broadcast service response (MCBCS Service Response) message is received from the content server 260. Here, the broadcast service response message includes a service guide including broadcast information (content information and schedule information) provided in a corresponding broadcast zone, a user ID, and a multicast IP mapped to a channel. The address (Multicast IP Address) is included.

When the broadcast service response message is received, the terminal 200 establishes a broadcast service connection for transmitting broadcast service traffic with the base station 240 in step 407. In this case, the broadcast service connection is configured as follows. First, the terminal 200 includes the multicast IP address in a DSA request message to obtain a multicast CID for a corresponding channel. Transmit to base station 240. In this case, the base station 240 managing the mapping table of the multicast IP address and the multicast CID (Connection ID) is a multicast IP address transmitted by the terminal 200. A multicast CID (Connection ID) mapped to is included in a DSA response message and transmitted to the terminal. Thus, the broadcast service connection can be established.

Thereafter, when the content to be received is selected by the user through the program information of the service guide, the terminal 200 selects the information on the selected content to the content server 260 in step 409. A content request message including information and ID identification is transmitted to request transmission of the corresponding broadcast content. In this case, communication between the terminal 200 and the content server 260 is performed through application signaling.

In step 411, the terminal 200 checks whether a content response message including a decryption key for broadcast content is received from the content server 260. Thereafter, when the content response message is received, the terminal 200 checks whether encrypted content, which has undergone packetization and time stamping, is received from the broadcast service controller 250 in step 413. When the content is received, in step 415, the content server 260 transmits a contents delivery report message indicating the end of reception. Here, the content reception report message includes billing data. For example, the billing data includes information on a user ID, content information, broadcast reception time, and the like. In this case, the terminal 200 may decrypt the corresponding content using the decryption key and then provide the corresponding broadcast content to the user.

In step 417, the terminal 200 determines whether an ACK (Content Delivery Ack) message for the content reception report is received from the content server 260. When the ACK (Content Delivery Ack) message for the content reception report is received, the terminal 200 terminates the algorithm according to the present invention.

5 is a diagram illustrating a procedure of a broadcast service providing method of a base station in a broadband wireless communication system according to a first embodiment of the present invention.

Referring to FIG. 5, in step 501, the base station 240 checks whether a burst reservation request message is received from the broadcast service controller 250. Here, the burst reservation request message includes a broadcast service burst frame offset (MCBCS Burst Frame Offset), a next broadcast service frame offset (Next MCBCS Frame Offset), and a next broadcast service OFDMA frame offset (Next MCBCS OFDMA Frame Offset). Information is included.

Here, the format of the burst reservation request message may be expressed as shown in Table 2 below.

Syntax Size Notes OFDMA Symbol Offset 8 bit OFDMA symbol offset with respect to start of next (MCBCS Burst Frame Offset + 2) th frame Subchannel offset 6 bit OFDMA subchannel offset with respect to start of the next (MCBCS Burst Frame Offset + 2) th frame Boosting 3 bit Refer to Table 273 No. OFDMA Symbols 7 bit The size of MCBCS data No. Subchannels 6 bit Repetition Coding Indication 2 bit 0b00-No repetition coding of 0b01-Repetition coding of 2 used 0b10-Repetition coding of 4 used 0b11-Repetition coding of 6 used Duration of OFDMA Symbol x Symbol offset between OFDMA Symbol Offset, and Next OFDMA Symbol Offset Duration of Subchannel y Symbol offset between Subchannel offset and Next Subchannel Offset Start of Frame number z Frame number in which MCBCS Burst is included

As shown in Table 2, the burst reservation request message includes OFDMA symbol offset information indicating an OFDMA symbol start position of an allocated broadcast service burst, and a subchannel for transmitting a broadcast service burst. Subchannel Offset information indicating the start index number of the number, OFDMA symbol information indicating the number of OFDMA symbols occupied by the broadcast service burst to be transmitted (No. OFDMA Symbols) information, and the number of subchannels transmitting the broadcast service burst Information on the number of subchannels (No. Subchannels), the period of OFDMA symbol / subchannel indicating the period between the initial burst and the next burst, and the frame number indicating the frame number to which the broadcast service burst is transmitted. Start of Frame number, the frame indicated by the MCBCS burst after the broadcast service MAP message. A broadcast service burst frame offset (MCBCS Burst Frame Offset) indicating an offset (frame offset) is configured.

When the burst reservation request message is received, the base station 240 allocates a transmission interval to be used for transmission of broadcast service traffic according to the request in step 503, and transmits the broadcast service controller ( A burst reservation ACK message is transmitted to the 250 to indicate that the reservation for the requested section has been successfully completed.

Here, referring to FIG. 3, the frame structure transmitted in the wireless section is checked. When the frame is received, the terminal checks the DL_MAP 300 to determine contents included in the subframe. Here, MCBCS_MAP_IE () 301 in the DL_MAP 300 indicates the location of the MCBCS_MAP message 303, and MCBCS_DATA_IE () 305 in the MCBCS_MAP message 303 transmits a broadcast service traffic. The position to be indicated, that is, the position of the broadcast service burst 311 is indicated. In this case, the broadcast service burst 311 is generally included in a frame 2-5 frames after the frame including the MCBCS MAP message 303, but may be included in a subsequent frame.

Here, the reason for constantly allocating the broadcast service burst period 311 is to obtain a macro diversity gain of broadcast traffic. Here, the macro diversity gain refers to a gain generated by amplification of a signal when the terminal receives the same signal from two or more base stations at the same time. For example, in the case of a terminal at a cell boundary, the terminal receives a signal from both base stations, where signals other than the signal received most strongly due to the difference in the signal transmission time from the base station and the content of the transmitted data are different. Will act as a damping effect. In other words, if the terminal receives two signals at different times and at different locations, the terminal receives signals other than the most strongly received signal as interference. However, when a broadcast service burst interval is uniformly allocated to a terminal located at a cell boundary to receive the same signal from two or more base stations at the same time, the terminal may receive several times amplified signals. . In addition, in order to obtain a macro diversity gain in the same broadcast zone, the same multicast CID should be used. Therefore, a rule in which a mapping between a multicast IP address and a multicast CID is included in the burst reservation request message should also be included.

In step 507, the base station 240 establishes a broadcast service connection with the terminal 200, and then terminates the algorithm according to the present invention.

6 is a diagram illustrating a procedure of a broadcast service providing method of a broadcast service controller in a broadband wireless communication system according to a first embodiment of the present invention.

Referring to FIG. 6, in operation 601, the broadcast service controller 250 includes the service of Table 1, which includes not only broadcast schedule information, but also content information and content provider information from the content server 260. Check whether the guide is received. When the service guide is received, the broadcast service controller 250 manages a broadcast service zone (MCBCS zone) for the base stations 240 managed by the broadcast service controller 250 in step 603. That is, it performs the operation information and maintenance of the base station 240 that it manages. In addition, the broadcast service controller 250 allocates broadcast service bursts to the base stations 240 based on the service guide received from the content server 260, generates broadcast service burst assignment information, and multicasts the content. Assign a connection identifier (Multicast CID) and manage it.

In operation 605, the broadcast service controller 250 transmits a burst reservation request message including the broadcast service burst allocation information to the base stations 240, thereby transmitting a downlink frame burst for a broadcast service. A request is made to allocate a downlink frame burst and a burst reservation ACK message is received from the base stations 240. Here, the burst reservation request message includes a broadcast service burst frame offset (MCBCS Burst Frame Offset), a next broadcast service frame offset (Next MCBCS Frame Offset), and a next broadcast service OFDMA (Othogonal Frequency Division Mdulation / Multiplexing Access): The following MCBCS OFDMA Frame Offset information is included.

Thereafter, the broadcast service controller 250 checks whether encrypted contents are received from the content server 260 in step 607, and when the contents are received, the encrypted content in step 609. Packetization for data synchronization and time stamping for time synchronization. In step 611, the broadcast service controller 250 transmits the packetized and time stamped content to the terminal 200, and then terminates the algorithm according to the present invention.

FIG. 7 is a flowchart of a broadcast service providing method of a content server in a broadband wireless communication system according to a first embodiment of the present invention.

Referring to FIG. 7, the content server 260 determines whether broadcast content is received from a content provider in step 701. When the content is received, the content server 260 receives the content file and stores the received content file in its file store. In step 703, the content server receives a service guide using the content file received from the content provider. Create Here, the service guide includes not only broadcast schedule information but also content information and content provider information.

In step 705, the content server 260 checks whether a broadcast service request (MCBCS Service Request) message including user profile information is received from the terminal. When the broadcast service request message is received, the content server 260 performs a user authentication procedure for checking whether the service is an authorized user for the terminal 200 using the user profile information in step 707. When the user authentication is completed, a service registration procedure of storing user information in a database is performed to provide a broadcast service to the terminal 200. In addition, the content server 260 transmits a broadcast service response (MCBCS Service Response) message to the terminal 200. The MCBCS Service Response message may include a service guide including user information (Content information, schedule information), a user ID (ID), a channel, and the like provided from a corresponding broadcasting zone. A mapped multicast IP address is included.

In step 709, the content server 260 determines whether a content request message including content information and user ID is received from the terminal 200. When the content request message is received, the content server 260 performs encryption on the corresponding content in step 711 and generates a content protection key for decrypting the encrypted content. A content response message including the generated content protection key is transmitted to the terminal 200. In step 713, the content server 260 transmits the encrypted contents to the broadcast service controller 250.

In step 715, the content server 260 checks whether a content delivery report message indicating the end of reception of the content is received from the terminal 200. Here, the content reception report message includes billing data. For example, the billing data includes information on a user ID, content information, broadcast reception time, and the like. When the content reception report message is received, the content server 260 performs charging for the broadcast service based on the information included in the message in step 717, and transmits the content reception report to the terminal 200. An ACK response (Content Delivery Ack) message is transmitted to inform the end of a successful broadcast service.

Thereafter, the content server 260 terminates the algorithm according to the present invention.

Meanwhile, in the broadband wireless communication system according to the first embodiment of the present invention, the broadcast service providing method performs service initialization according to a terminal initialization DSA method, but may also perform the service initialization using a base station initialization DSA method. In the following, a broadcast service providing method using the same will be described as a second embodiment.

8A to 8B are diagrams illustrating an entire signal flow for providing a broadcast service in a broadband wireless communication system according to a second embodiment of the present invention.

8A to 8B, first, steps 801 to 821 are the same as steps 201 to 221 of FIG. 2, and will not be described again in the following description.

After receiving the broadcast service response message, the terminal 800 sends a content request message including the selected content information and a user ID to the content server 860 in step 823. send. In this case, the content server 860 performs encryption on the corresponding content in step 825, generates a content protection key for decrypting the encrypted content, and proceeds to step 827 to generate the content. A content response message including the encrypted content protection key is transmitted to the terminal 200. In step 829, the content server 860 transmits the encrypted contents to the broadcast service controller 850, and the user receives the actual broadcast content to the broadcast service controller 850 in step 835. Send service initialization request message

Thereafter, the broadcast service controller 850 performs packetization for data synchronization on the encrypted contents received from the content server 860 in step 831, and performs time synchronization in step 833. Time stamping is performed. Thereafter, the broadcast service controller 850 enables the terminal 800 to receive content traffic from the base station 240 in step 837 according to the service initialization request received from the content server 860 in step 835. To do so, a broadcast service initialization request message for generating a connection between the base station 840 and the terminal 800 is transmitted to the base station 840.

After receiving the message, the base station 840 establishes a broadcast service connection with the terminal 800 in step 839. In the broadcast service connection, the base station 840 transmits a DSA request (Dynamic Service Addition Request) message to the terminal 800 to start initialization of a broadcast service connection, and the terminal 800 receiving the message receives the message. Transmits a DSA response message to the base station 840, and the base station 840 receiving the message transmits a DSA ACK (Dynamic Service Addition ACK) message to the terminal 800. have. Thereafter, when the broadcast service connection setup procedure is completed, the base station 840 transmits a broadcast service initialization response message to the broadcast service controller 850 in step 841 to inform that preparation for broadcast service is completed. In this case, the broadcast service controller 850 transmits the content (packet) and the time stamping the content (contents) in step 843 to the terminal (800).

In step 845, the terminal 800 completes reception of the content, and transmits a contents delivery report message to the content server 860 indicating the end of reception. Here, the content reception report message includes billing data. For example, the billing data includes information on a user ID, content information, broadcast reception time, and the like. If a part of the received content is not normally received, the terminal 800 may request retransmission to the content server 860.

In step 847, the content server 860 charges the broadcast service based on the information included in the message. In step 849, the content server 860 responds to the content reception report to the terminal 800. A Delivery Ack) message is sent to inform the end of a successful broadcast service.

In step 851, the content server 860 notifies the end of the service by transmitting a service release request message to the broadcast service controller 850. In this case, the broadcast service controller 850 requests a broadcast service release request to the base station 840 to release the connection created for the broadcast service between the base station 840 and the terminal 800 after the service is terminated. Request) Send a message. After receiving the broadcast service release request message, the base station 840 releases the connection through a dynamic service detach (DSD) process with the terminal 800 in step 855. In addition, the broadcast service controller 850 transmits a broadcast service release response (MCBCS Service Release Response) message to completely terminate the broadcast service for the user.

9 is a diagram illustrating a procedure of a broadcast service receiving method of a terminal in a broadband wireless communication system according to a second embodiment of the present invention.

Referring to FIG. 9, when a user is requested to receive a broadcast service, the terminal 800 transmits a broadcast service request message to the content server 860 in step 903, and then the content server. A broadcast service response (MCBCS Service Response) message is received from 860. Here, the broadcast service request message is a message for requesting registration of a broadcast service in order for the terminal 800 to receive a broadcast service provided in a corresponding broadcast zone. The message includes user profile information, and the broadcast service The response message includes a service guide including broadcasting information (content information and schedule information) provided in the corresponding broadcasting zone, a user ID, and a multicast IP address mapped to a channel. ) Is included.

Thereafter, when the terminal 800 selects content to be received by the user through program information of the service guide, the terminal 800 transmits the information about the selected content to the content server 860 in step 905. requesting transmission of the corresponding broadcast content by transmitting a Content Request message including information) and a user ID, and a content response including a decryption key for the broadcast content from the content server 860. Receive a (Content Response) message.

In step 907, the terminal 800 determines whether a DSA request (Dynamic Service Addition Request) message for establishing a broadcast service connection is received from the base station 840. When the DSA request (Dynamic Service Addition Request) message is received, the terminal 800 proceeds to step 909 to generate a DSA response (Dynamic Service Addition Response) message, and the generated DSA response message to the base station 0 ( 840). Thereafter, the terminal 800 receives a DSA ACK message from the base station 840 to complete a broadcast service connection setup in step 911, and then receives a packet from the broadcast service controller 850 in step 913. Checks whether encrypted content, which has undergone normalization and time stamping, is received.

When the content is received, the terminal 800 transmits a contents delivery report message indicating the termination of reception to the content server 860 in step 915, and receives the content from the content server 860. Receive an ACK response (Content Delivery Ack) message for the report. Here, the content reception report message includes billing data. For example, the billing data includes information on a user ID, content information, broadcast reception time, and the like. In this case, the terminal 800 may decrypt the corresponding content using the decryption key and then provide the corresponding broadcast content to the user.

In step 917, the terminal 800 releases the connection through the DSD process of the base station 840, and then terminates the algorithm according to the present invention.

FIG. 10 is a flowchart of a broadcast service providing method of a base station in a broadband wireless communication system according to a second embodiment of the present invention.

Referring to FIG. 10, in step 1001, the base station 840 checks whether a burst reservation request message is received from the broadcast service controller 850. Here, the burst reservation request message includes a broadcast service burst frame offset (MCBCS Burst Frame Offset), a next broadcast service frame offset (Next MCBCS Frame Offset), and a next broadcast service OFDMA frame offset (Next MCBCS OFDMA Frame Offset). Information is included.

When the burst reservation request message is received, the base station 840 allocates a transmission interval to be used for transmission of broadcast service traffic according to the request in step 1003, and transmits the broadcast service controller ( A burst reservation ACK message is sent to the 850 to indicate that the reservation for the requested section has been successfully completed.

In step 1007, the base station 840 checks whether a broadcast service initialization request message is received from the broadcast service controller 850. When the broadcast service initialization request message is received, the base station 840 starts a broadcast service connection initialization by transmitting a DSA request message to the terminal 800 in step 1009. Thereafter, the base station 840 checks whether a DSA response message is received from the terminal 800 in step 1011, and when the DSA response message is received, the base station 840 transmits the DSA to the terminal 800. Send an ACK (Dynamic Service Addition ACK) message. Thus, the setting of the broadcast service connection with the terminal 800 can be completed. In step 1015, the base station 840 transmits a broadcast service initialization response message to the broadcast service controller 850 to inform that the broadcast service is ready.

Thereafter, the base station 840 checks whether a broadcast service release request message is received from the broadcast service controller 850 in step 1017, and when the broadcast service release request message is received, the terminal 800 in step 1019. And release the connection through the DSD process, and transmits a broadcast service release response message to the broadcast service controller 850.

Thereafter, the base station 840 terminates the algorithm according to the present invention.

11 is a diagram illustrating a procedure of a broadcast service providing method of a broadcast service controller in a broadband wireless communication system according to a second embodiment of the present invention.

Referring to FIG. 11, first, steps 1101 to 1109 are the same as steps 601 to 619 of FIG. 6 and will not be described again in the following description. However, the content request message includes a content ID and a user ID to be received through program information of the service guide, and the content response message includes the content ID. And a user ID (IDentification) and the generated content protection key.

Thereafter, the broadcast service controller 850 receives a service initialization request message from the content server 860 in step 1111 and the base station to enable the terminal 800 to receive content traffic from the base station 840. The broadcast service initialization request message for creating a connection between the terminal 840 and the terminal 800 is transmitted to the base station 840.

Thereafter, the broadcast service controller 850 checks whether a broadcast service initialization response message is received from the base station 840 in step 1113, and when the broadcast service initialization response message is received, preparation for broadcast service is completed. In step 1115, the terminal 100 transmits the content of the packetization and time stamping to the terminal 800.

Thereafter, the broadcast service controller 850 checks whether a service release request message is received from the content server 860 in step 1117, and terminates the service in step 1119 when the service release request message is received. In order to release the connection created for the broadcast service between the base station 840 and the terminal 800, a broadcast service release request (MCBCS Servcie Release Request) message is transmitted to the base station 840, and from the terminal 800 Receives a broadcast service release response (MCBCS Service Release Response) message.

Thereafter, the broadcast service controller 850 ends the algorithm according to the present invention.

12 is a flowchart illustrating a method of providing a broadcast service of a content server in a broadband wireless communication system according to a second embodiment of the present invention.

Referring to FIG. 12, first, steps 1201 to 1211 are the same as steps 701 to 711 of FIG. 7 and will not be described again in the following description. However, the content request message includes a content ID and a user ID to be received through program information of the service guide, and the content response message includes the content ID. And a user ID (IDentification) and the generated content protection key.

In step 1213, the content server 860 transmits the encrypted contents to the broadcast service controller 850 and then transmits a service initialization request message. In step 1215, the content server 860 checks whether a content delivery report message indicating that the content is received is received from the terminal 800. Here, the content reception report message includes billing data. For example, the billing data includes information on a user ID, content information, broadcast reception time, and the like. When the content reception report message is received, the content server 860 performs charging for the broadcast service based on the information included in the message in step 1217, and transmits the content reception report to the terminal 800. An ACK response (Content Delivery Ack) message is transmitted to inform the end of a successful broadcast service.

In step 1219, the content server 860 notifies the end of the service by transmitting a service release request message to the broadcast service controller 850, and then terminates the algorithm according to the present invention.

Meanwhile, the terminal and the base station may establish a wireless section connection, for example, a unicast connection, for delivering broadcast content.

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 determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention provides a pre-connection setting procedure for providing a broadcast service, a procedure for transmitting broadcast information, a procedure for registering with a corresponding content broadcast service through received broadcast information, and a request for content reception. There is an advantage in activating the broadband wireless communication system by providing an apparatus and method for the delivery of decryption information.

Claims (53)

A method of receiving a broadcast service of a terminal in a broadband wireless communication system, Setting up a wireless section connection for transmission of broadcast content with a base station; Transmitting a MCBCS (MCBCS) Service Request message to a broadcast service controller; When an MCBCS Service Response message is received from the broadcast service controller, establishing an MCBCS connection with the base station, and transmitting a content request message to the broadcast service controller; How to. The method of claim 1, The wireless section connection is characterized in that the unicast (unicast) connection. The method of claim 1, The MCBCS Service Request message includes a user profile information. The method of claim 1, The MCBCS Service Response message includes at least one of content information, schedule information, broadcast user ID, and multicast IP address mapped to a channel. Characterized in that. The method of claim 4, wherein the setting of the MCBCS connection comprises: Transmitting a DSA request (Dynamic Service Addition Request) message including a multicast IP address to the base station; Receiving a DSA response message including a multicast connection ID (CID) mapped to the multicast IP address from the base station. The method of claim 1, The content request message includes at least one of content information and user ID. The method of claim 1, Receiving a content response message and content from the broadcast service controller. The method of claim 7, wherein The content response message includes content information, a user ID, and a decryption key for broadcast content. The method of claim 7, wherein And transmitting a Contents Delivery Report message including charging data to the broadcast service controller, and receiving an Content Delivery Ack message from the broadcast service controller. The method of claim 9, The charging data comprises at least one of a user ID (IDentification), content information (content information), received time (duration), the reception result. A method of providing a broadcast service in a base station of a broadband wireless communication system, When a burst reservation request message for a specific multicast and broadcast service (MCBCS) burst is received from a broadcast service controller, the requested MCBCS burst is transmitted with MCBCS traffic. The process of assigning And establishing a wireless section connection for the delivery of the terminal and the broadcast content. The method of claim 11, The frame transmitted in the transmission section includes address information of an MCBCS map (MAP) message in a first section of an i-th frame, and includes address information of MCBCS burst in a second section of the i-th frame. And including the MCBCS map (MAP) message, and including the MCBCS burst in an i + a-th frame. The method of claim 11, The Burst Reservation Request message includes OFDMA symbol offset information indicating an OFDMA symbol start position of an OFDMA (OFDMA) symbol of an allocated MCBCS burst, and an MCBCS burst. Subchannel Offset information indicating the start index number of the subchannel to be transmitted, No. OFDMA Symbols information indicating the number of OFDMA symbols occupied by the MCBCS burst to be transmitted, and information on the subchannel transmitting the MCBCS burst. No. Subchannels information indicating the number, OFDMA symbol / subchannel indicating the period between the initial burst and the next burst, frame number indicating the frame number to which the MCBCS burst is transmitted. Start of Frame number, frame offs indicated by MCBCS burst after MCBCS MAP message et) at least one of MCBCS Burst Frame Offset. The method of claim 11, The wireless section connection is characterized in that the unicast (unicast) connection. The method of claim 11, The method further comprises the step of establishing the MCBCS connection with the terminal. The method of claim 11, Checking whether an MCBCS service initialization request message is received from the broadcast service controller; When the MCBCS service initialization request message is received, establishing a MCBCS connection with the terminal. The method of claim 16, wherein the MCBCS connection establishment process, Transmitting a DSA request message to the terminal; And when a Dynamic Service Addition Response (DSA) message is received from the terminal, transmitting a Dynamic Service Addition ACK (DSA ACK) message to the terminal. The method of claim 16, Transmitting an MCBCS service initialization response message to the broadcast service controller. A broadcast service providing method in a broadcast service controller of a broadband wireless communication system, When a broadcast content property and content are received from a broadcast service content provider, generating a service guide using the received broadcast content property and content; When a MCBCS Service Request (MCBCS) Service Request (MCBCS) message is received from a terminal, an MCBCS Service Response message including the generated service guide is sent to the terminal. Transfer process, And when a content request message is received from the terminal, transmitting the corresponding content to the terminal. The method of claim 19, After generating the service guide, transmitting a burst reservation request message for a specific MCBCS burst to a base station and a base station controller; And receiving an ACK response to the burst reservation request message. The method of claim 20, The Burst Reservation Request message includes OFDMA symbol offset information indicating an OFDMA symbol start position of an allocated OFDMA burst (OFDMA), and an MCBCS burst. Subchannel Offset information indicating the start index number of the subchannel to be transmitted, No. OFDMA Symbols information indicating the number of OFDMA symbols occupied by the MCBCS burst to be transmitted, and information on the subchannel transmitting the MCBCS burst. No. Subchannels information indicating the number, OFDMA symbol / subchannel indicating the period between the initial burst and the next burst, frame number indicating the frame number to which the MCBCS burst is transmitted. Start of Frame number, frame off indicated by MCBCS burst after MCBCS MAP message and at least one of an MCBCS Burst Frame Offset. The method of claim 19, The MCBCS Service Request message includes a user profile information. The method of claim 19, The MCBCS Service Response message includes at least one of a service guide, a broadcast user ID, and a multicast IP address mapped to a channel. The method of claim 19, When a content request message is received from the terminal, a content protection key for the broadcast content is generated, and a content response including the generated content protection key is included. The method further comprises transmitting a content response message to the terminal. The method of claim 24, The Content Request message includes at least one of Content information and User ID. The method of claim 25, The content response message includes at least one of content information, a user ID, and a content decryption key. The method of claim 24, The Content Request message includes at least one of Content ID and User ID. The method of claim 27, The content response message includes at least one of a content ID, a user ID, and a content decryption key. The method of claim 28, Transmitting a content response message to the terminal and transmitting an MCBCS service initialization request message to the base station; When the MCBCS service initialization response message is received from the base station, transmitting the content to the terminal. The method of claim 19, When the contents delivery report message is received from the terminal, performing charging based on the charging data included in the message, and transmitting an ACK response (Content Delivery Ack) message to the terminal. Characterized in that. The method of claim 30, The charging data comprises at least one of a user ID (IDentification), content information (content information), received time (duration), the reception result. The method of claim 30, And the charging data includes at least one of a user ID, a content ID, a received duration, and a received result. The method of claim 19, And when the MCBCS service request message is received from the terminal, performing user authentication and service registration. The method of claim 19, And when a broadcast content property is received from the broadcast service content provider, transmitting an ACK (Content Transfer Ack) response signal to the broadcast service content provider. The method of claim 19, The service guide includes at least one of content information and schedule information. The method of claim 19, The content property may include at least one of MCBCS traffic pattern, Contents Provider information, Encoding information, and Content duration information. In the broadcast service providing apparatus of a broadband wireless communication system, 무선 (Multicast MCBCS (Multicast and Broadcast Service: hereinafter referred to as 'MCBCS') by establishing a wireless section connection with the base station to perform a service request (MCBCS Service Request) to receive a service guide, the broadcast service controller A terminal for receiving a content decryption key by performing a content request, establishing an MCBCS connection with a base station, and receiving content from the broadcast service controller; A base station for allocating a specific MCBCS burst as an MCBCS traffic transmission interval for the terminal and establishing a wireless interval connection and an MCBCS connection with the terminal; After generating a service guide using the broadcast content property and content received from a broadcast service content provider, controlling the base station to allocate a specific MCBCS burst to the terminal, according to the MCBCS Service Request (MCBCS Service Request) of the terminal A broadcast service controller for transmitting the generated service guide to the terminal, generating a content decryption key according to the content according to the content request of the terminal, transmitting the generated service guide to the terminal, and transmitting the content to the terminal; Apparatus comprising a. The method of claim 37, wherein The wireless section connection is characterized in that the unicast (unicast) connection. The method of claim 37, wherein The service guide may include at least one of content information and schedule information. The method of claim 37, wherein And a broadcast service content provider for generating the content and transmitting a content property and content to the broadcast service controller. The method of claim 37, wherein A terminal for performing a contents delivery report to the broadcast service controller when the contents reception is completed; And the broadcast service controller configured to perform charging according to the contents delivery report. A method of receiving a broadcast service of a terminal in a broadband wireless communication system, Setting up a wireless section connection for transmission of broadcast content with a base station; Transmitting a MCBCS (MCBCS) Service Request message to a broadcast service controller; And when a MCBCS Service Response message is received from the broadcast service controller, transmitting a content request message to the broadcast service controller. The method of claim 42, The wireless section connection is characterized in that the unicast (unicast) connection. The method of claim 42, The MCBCS Service Request message includes a user profile information. The method of claim 42, The MCBCS Service Response message includes at least one of content information, schedule information, broadcast user ID, and multicast IP address mapped to a channel. Characterized in that. The method of claim 42, The Content Request message includes at least one of Content ID and User ID. The method of claim 42, Receiving a content response message from the broadcast service controller. The method of claim 47, The content response message includes at least one of a content ID, a user ID, and a content decryption key. The method of claim 42, Establishing a MCBCS connection with the base station; Receiving content from the broadcast service controller. The method of claim 49, wherein the establishing of the MCBCS connection comprises: When a DSA request message is received from the base station, transmitting a DSA response message to the base station; Receiving a DSA ACK (Dynamic Service Addition ACK) message from the base station. The method of claim 49, And transmitting a Contents Delivery Report message including charging data to the broadcast service controller, and receiving an Content Delivery Ack message from the broadcast service controller. The method of claim 51 wherein The charging data comprises at least one of a user ID (IDentification), content ID, received duration (duration), the reception result. In the frame structure for a broadcast service, Address information of a multicast and broadcast service (MCBCS) map (MAP) message is included in a first section of an i-th frame, and address information of an MCBCS burst is included in a second section of the i-th frame. And the MCBCS map (MAP) message, and including the MCBCS burst in an i + a-th frame.

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