KR101085575B1 - A cas service system for providing cas service and operating method thereof - Google Patents

Abstract

PURPOSE: A CAS service system and operation method thereof are provided to supply a CAS service from a CAS server of a CAS center at a remote place. CONSTITUTION: An EMM(Entitlement Management Message) generating unit(220) generates a reception entitlement management message. An ECM(Entitlement Control Message) generating unit(230) generates an ECM. An SMS(Short Message Service) processing unit(250) updates subscriber management information through a subscriber management command. A PMS(Program Management System) processing unit(260) updates a broadcasting schedule through broadcasting program management information.

Description

A CAS service system for providing CAS service and its method of operation

The present invention relates to a CAS service system for providing a CAS service and a method of operating the CAS service system. The CAS server is configured in an independent center format without installing a CAS server in a head-end of one broadcasting company. It relates to a CAS service system and its operation method that can provide a cost and resource-efficient CAS service by remotely providing a CAS function provided by a vendor).

Conditional Access System (CAS) protects the broadcast contents by encrypting the broadcast contents in various pay broadcasting service environments such as IPTV, digital cable, satellite, and DMB. It is a security system that makes it possible.

A broadcaster head-end (a broadcast server system composed of a video encoder, multiplexer, transmission system, etc.) scrambles (or encrypts) broadcast content including video, audio, and data to transmit a broadcast. The function of encrypting broadcast content varies depending on the broadcast environment and device configuration, but may be included in a multiplexer or exist in an independent scrambler device.

The CAS includes an entitlement or a product in a message called an Entitlement Management Message (EMM) to a subscriber who normally purchases broadcast content, and delivers the entitlement or product to the CAS module in the subscriber terminal.

When a subscriber tunes a channel to watch a specific broadcast content, the CAS module in the subscriber terminal analyzes an Entitlement Control Message (ECM) delivered with the encrypted broadcast content so that the subscriber can watch the specific broadcast content. Verify that eligibility exists at the subscriber terminal. If the corresponding recipient is transmitted through the EMM in advance, the CAS module in the subscriber terminal extracts a control word from the ECM and descrambles (or decrypts) the encrypted broadcast content so that the subscriber broadcasts it. Make your content watchable.

"System that is responsible for scrambling (Scrambler or Multiplexer)" and "CAS server for generating ECM / EMM" are separate systems, and the two systems are interworked according to the interface protocol that operates on the Internet protocol according to DVB SimulCrypt international standard. do.

In addition, the broadcaster head-end includes a program management system (PMS) and a subscriber management system (SMS) for providing broadcast program schedule information and subscriber management commands to the CAS server. PMS delivers schedule information to CAS servers about what conditions (product, age, region, etc.) they must have in order to watch a particular channel or a specific program. Send subscriber management command to CAS server.

Accordingly, a broadcaster who wants to provide a paid broadcast service should introduce a CAS system, which is one of the most important systems to operate a business.

1 is a block diagram showing a CAS system provided in the head-end of the broadcast service according to the prior art. As shown in FIG. 1, the scrambler 30 provided in the broadcaster Head-end 10 is a device that encrypts the original broadcast content signal so that an unauthenticated receiver cannot view it. The broadcast content signal input using the control word generated in step 34 is output after scrambling. The control word generator 34 generates a control word, which is an encryption key for scrambled paid content, as a random value. Along with this function, the scrambler 30 requests the ECM Generator 22 of the CAS server 20 to generate an ECM, receives the response, and outputs an ECM together with the scrambled content. The ECM generated by the ECM Generator 22 includes not only control words, but also information on what conditions (product, age, region, etc.) must be present in order to watch a particular channel or a specific program. Provided by The EMM Generator 24 of the CAS Server 20 generates an EMM including subscriber management commands such as subscriber subscription / termination, product purchase / cancellation, etc., and is provided separately in the MUX 32 or the outside of the scrambler 30. Deliver to MUX 40. EMM generation of the EMM Generator 24 is performed under the management of the SMS 12, which is a subscriber management system.

The DEMUX 51 provided in the set-top box 50 of the service subscriber de-multiplexes the scrambled broadcast channel, ECM, and EMM from the received broadcast signal and outputs the scrambled broadcast channel. The CAS client 53 receives the ECM and the EMM from the DEMUX 51, and extracts the control word from the ECM and delivers the control word to the descrambler 52 when there is a viewing qualification for the channel tuned by the user. The descrambler 52 descrambles or decodes the scrambled broadcast channel received using the control word provided from the CAS client 53.

However, the broadcasting company has a problem of excessive initial investment cost (cost, place) because it needs to purchase and install H / W, S / W for CAS system in its head-end.

In addition, there is another problem that the operating costs are continuously generated because the personnel for operating and monitoring the installed CAS system must be secured separately.

In addition, in the case of changing the vendor providing the CAS system, there is another problem that the CAS system installed in the head-end of the broadcasting company cannot be continuously used and replaced.

In order to solve the problems of the prior art, the present invention provides a CAS service of a corresponding head-end at a CAS center located remotely from a head-end of a broadcasting company, thereby providing a CAS service at a low investment cost. The purpose is to be able to receive.

In addition, an object of the present invention is to separately operate a CAS center that can provide a CAS service professionally, so that the head-end of the broadcaster does not need to directly operate the CAS system.

Another object of the present invention is to provide a CAS system of various vendors in a CAS center that provides a CAS service remotely, so that a broadcaster can easily change the CAS service as needed.

In addition, the present invention has another object to provide a CAS service as in the past by interlocking a scrambler, PMS, SMS, etc. in the head-end with an existing CAS system with a CAS server in the CAS center.

In addition, the present invention, in providing a CAS service in the CAS center, by assigning an identifier that can uniquely identify one or more head-end, even if a plurality of Hend-end is provided with the CAS service, each head-end There is another purpose to help identify.

In the CAS service providing system, an object of the present invention generates an EMM and an EMM generator for transmitting an EMM generated to the broadcasting head-end and the broadcasting head. an ECM generator for generating an EMT in response to a request for generating an EMM transmitted from the SCS of the -end and a subscriber management command transmitted from the subscriber management unit (SMS) of the broadcaster Head-end; And a PMS processor for updating the broadcast schedule and broadcast condition information using the SMS processor for updating subscriber management information and the broadcast program management information transmitted from the program manager (PMS) of the broadcaster Head-end. This is accomplished by a CAS center that includes a control unit that generates a BSID for identifying the head-end.

Another object of the present invention is to provide a CAS service providing system, comprising: a control word generator (CWG) for randomly generating a control word that encrypts broadcast content and an EMM generator of a CAS center. The multiplexer (MUX) for transmitting the EMM transmitted to the subscriber station and the SCS for requesting the EMM generation to the ECM generator of the CAS center and the broadcast content using the control word And a subscriber management unit (SMS) for transmitting a subscriber management command for a broadcast service subscriber to the SMS processing unit of the CAS center and broadcast program management information, and a PMS processing unit of the CAS center. Is achieved by a broadcaster head-end comprising a program management unit (PMS) for transmission to the network.

In addition, another object of the present invention is to provide a CAS service in the CAS center that stores the network information of any one or more of the BSID of the broadcaster Head-end and the scrambler, messaging server or subscriber management unit (SMS) corresponding to the BSID The first step of receiving a subscriber management command transmitted from the subscriber management unit (SMS) of the broadcaster head-end in the SMS processing unit of the CAS center, and the SMS processing unit BSBS corresponding to the broadcaster head-end and the subscriber management A second step of determining whether the subscriber ID is mapped to the BSID using the subscriber ID included in the command, and if the subscriber ID is mapped to the BSID in the second step, the SMS processing unit is configured to perform the subscriber ID. A third step of requesting the EMM generator to generate an EMM corresponding to the EMM generator; and the EMM generator generated It is achieved by the message (EMM) to a method of generating the EMM in the center consisting of CAS to a fourth step of transmitting to the broadcasting Head-end.

Another object of the present invention is to provide a CAS service in a CAS center storing at least one network information of a BSID of a broadcaster head-end and a scrambler or a program management unit (PMS) corresponding to the BSID. A first step in which broadcast program management information including the BSID and service number transmitted from a program manager (PMS) of a broadcaster head-end is received by the PMS processor of the CAS center; and the PMS processor corresponds to the broadcaster head-end. A second step of determining whether the service number is mapped to the BSID using a BSID and a service number included in the broadcast program management information, and when the service number is mapped to the BSID in the second step, The PMS processing unit newly stores or updates the broadcast program management information in a database of the CAS center. A third step of performing at least one of the scenes; and a fourth step of receiving a request for generating a qualification control message (ECM) transmitted from the SCS of the broadcaster head-end by the ECM generator of the CAS center and the broadcaster head- and a fifth step of retrieving a broadcast schedule and broadcast condition information corresponding to the end to generate an EMT, and a sixth step of transmitting the generated EMM to the SCS. This is accomplished by the method of generating an accounting control message at the CAS center.

Accordingly, a CAS service system and a method of operating the CAS service system for providing a CAS service of the present invention provide a CAS service of a corresponding head-end by a CAS server of a CAS center remotely located from a head-end of a broadcaster. It is effective to receive CAS service at low investment cost.

In addition, the present invention by operating a CAS center that specializes in providing a CAS service separately, the head-end of the broadcaster does not directly operate the CAS system, there is another effect that can reduce the operating cost.

In addition, the present invention has another effect that a broadcaster can easily change the CAS service as needed by ensuring a CAS system of various vendors in a CAS center that provides a CAS service remotely.

In addition, the present invention has another effect that the scrambler, PMS, SMS, etc. existing in the head-end having a CAS system can be provided with a CAS service as in the past by interworking with a CAS server in a CAS center.

In addition, the present invention provides another CAS service by providing an identifier for uniquely identifying one or more head-ends in providing CAS services. .

In addition, the present invention has another effect of providing a new service for service compatibility and subscriber mobility between broadcasters using the CAS center together.

In addition, since the CAS server is operated by a CAS expert in the CAS center, there is another effect that a more secure CAS service can be provided.

1 is a block diagram showing a CAS system provided in the head-end of the broadcast service according to the prior art,
2 is a block diagram showing the relationship between the CAS center and the broadcaster Head-end according to the present invention,
3 is a flowchart illustrating generating an EMM according to subscriber processing in a CAS center according to the present invention;
4 is a flowchart of a first embodiment for delivering an EMM generated by a CAS center according to the present invention to a broadcaster Head-end;
5 is a flowchart of a second embodiment for delivering an EMM generated by a CAS center according to the present invention to a broadcaster Head-end;
6 is a flowchart of a third embodiment for delivering an EMM generated by a CAS center according to the present invention to a broadcaster Head-end;
FIG. 7 is a flowchart for generating and transmitting an EMT to a broadcaster Head-end according to a broadcast schedule in a CAS center according to the present invention.

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

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

2 is a block diagram showing the relationship between the CAS center and the broadcaster Head-end according to the present invention. As shown in FIG. 2, the CAS center 200 transmits an EMM generation unit 220 for generating an EMM, an EMM generation message transmitted from the SCS 114 of the broadcaster Head-end 100. (ECM) subscriber management command (BSID, subscriber ID or subscriber management) transmitted from the SMS 130 of the ECM generator 230, the broadcaster Head-end 100, which generates the EMM according to the ECM generation request Broadcast schedule and broadcast condition information by using the broadcast program management information transmitted from the SMS processing unit 250 and the program management unit (PMS) 140 of the broadcaster Head-end 100 for receiving subscriber information and updating the subscriber management information. PMS processing unit 260 for updating the network, control unit 240 for generating a broadcasting system identifier (BSID) for identifying the broadcaster head-end 100 and the subscriber ID, between the BSID of the broadcaster head-end, BSID and subscriber ID Mapping information, SCS (SimulCrypt Synchr) included in broadcasting head-end mapping information between IP network information including IP address and port number of onizer), mapping information between BSID and service number included in broadcasting head-end, IP address and port number of MUX included in BSID and broadcasting head-end And a database 210 that stores mapping information and the like between IP network information including the data.

The EMM generating unit 220 receives a request for generating an EMM from the SMS processing unit 250 that receives the subscriber management command transmitted from the subscriber management unit (SMS) 130 of the broadcaster Head-end 100. Using the BSID, subscriber ID, and subscriber management information included in the subscriber management command received from the SMS processing unit 250, an EMM is applied to the subscriber of the broadcaster Head-end 100. . The subscriber management information includes information such as service subscription / termination of a broadcast service subscriber and purchase or cancellation of broadcast content.

The EMM generator 220 transmits the generated EMM to any one of the subscriber manager (SMS) 130, the multiplexer (MUX, 113), or the messaging server 120 of the broadcaster Head-end 100. do.

At this time, the network information of the subscriber management unit (SMS) 130, the multiplexer (MUX, 113), or the messaging server 120 to which the EMM is received is stored in the database 210 of the CAS center 200. If a destination of any one of SMS, SMS 130, multiplexer (MUX, 113), or messaging server 120 is selected, IP network information (such as IP address and port number) of the destination is extracted from the database 210. To transmit.

The ECM generation unit 230 generates a qualification control message (ECM) in response to a request for generating a qualification control message (ECM) transmitted from the SCS 114 of the broadcaster Head-end 100. At this time, if the BSID of the broadcaster head-end 100 is not included in the request for generating a qualification control message (ECM), the ECM generator 230 may determine the broadcaster head-end 100 stored in the database 210. Retrieve the BSID.

The ECM generator 230 retrieves the broadcast schedule and the broadcast condition information from the database 210 using the BSID and the service number of the broadcaster Head-end 100, and controls eligibility using the retrieved broadcast schedule and the broadcast condition information. After generating the message (ECM), and transmits to the SCS (114) of the broadcast head-end (100).

The SMS processing unit 250 receives a subscriber management command (any one or more of BSID, subscriber ID or subscriber status information) transmitted from the subscriber management unit (SMS) 130 of the broadcaster Head-end 100 and responds to the subscriber management command. The subscriber management information for the mapped subscriber ID is updated in the database 210. In addition, if it is determined that the subscriber ID is mapped to the BSID, the subscriber ID requests the EMM generator 220 to generate an EMM. At this time, if the subscriber ID is not mapped to the BSID, an error message is generated and transmitted to the subscriber management unit (SMS) 130 of the broadcaster Head-end 100.

The PMS processor 260 updates the broadcast schedule and broadcast condition information by using the broadcast program management information transmitted from the program manager (PMS) 140 of the broadcaster Head-end 100. At this time, the PMS processor 260 determines whether the service number (broadcast channel) belongs to the BSID included in the broadcast program management information.

Meanwhile, the broadcaster head-end 100 includes a scrambler 110 including a control word generator (CWG) 111, a multiplexer (MUX, 113), an encryption unit (SCR, 112), and an SCS (SimulCrypt Synchronizer, 114). ), A messaging server 120, a subscriber manager (SMS) 130, and a program manager (PMS) 140.

The control word generator (CWG) 111 randomly generates a control word for encrypting the broadcast content provided by the broadcaster Head-end (100) and provides it to the encryption unit (SCR, 112).

When the multiplexer (MUX) 113 receives the EMM generated by the EMM generator 220 of the CAS center 200, the multiplexer (MUX) 113 receives the received EMM from the broadcaster Head-end (100). ) To a subscriber station (not shown).

The encryption unit SCR 112 encrypts the broadcast content using the control word generated by the control word generation unit CWG 111.

SCS (SimulCrypt Synchronizer, 114) requests the ECM generation unit 230 of the CAS center 200 to generate a credential control message (ECM), and sends a credential control message (ECM) generated by the ECM generation unit 230. Receives, and transmits the broadcast content encrypted with the control word by the encryption unit (SCR) 112 and the recipient control message (ECM) to the subscriber terminal (not shown) of the broadcaster Head-end (100).

When the broadcasting server Head-end 100 transmits an EMM to a subscriber station (not shown) by using another communication channel such as a mobile communication network, the EMM of the CAS center 200 is transmitted. The generation unit 220 delivers the EMM to the messaging server 120 of the broadcaster Head-end 100 and subscribes to the EMM through a short message service or a separate unicast channel. Pass directly to the terminal. In this case, the EMM generation unit 220 does not use the IP network information including the IP address and port number of the multiplexer (MUX, 113) of the broadcaster Head-end 100 associated with the BSID, the messaging server 120 The EMM is transmitted to the messaging server 120 by using the network information of the.

Subscriber management unit (SMS) 130 is a subscriber management command for the broadcast service subscriber of the broadcaster Head-end 100 (information of any one or more of the service subscription or termination of the broadcast service subscriber, and information on any one or more of the purchase or cancellation of broadcast content And the BSID of the broadcaster Head-end allocated from the CAS center) is transmitted to the SMS processing unit 250 of the CAS center 200.

The program manager 140 transmits broadcast program management information to the PMS processor 260 of the CAS center 200. The broadcast program management information is a broadcast channel configured in the broadcaster Head-end 100, time schedule information of a broadcast program constituting the broadcast channel, a condition for watching a channel or a program, and among these conditions, a condition for watching a channel or a program is It includes information on any one or more of the product type, age or region of the broadcast service, the age is any one or more of the subscriber or viewer of the broadcast service. In addition, the broadcast program management information includes the BSID of the broadcaster Head-end 100 allocated from the CAS center 200.

3 is a flow chart illustrating generation of an EMM in accordance with subscriber processing in a CAS center in accordance with the present invention. As shown in FIG. 3, the control unit of the CAS center allocates a BSID for each broadcaster Head-end and registers network information of a scrambler or messaging server included in the broadcaster Head-end (S310).

The CAS center needs to identify each broadcaster's head-end because it must work with systems in multiple broadcaster headends. To this end, BSID (Broadcasting System Identifier) is assigned to each broadcasting head-end to identify each broadcasting head-end.

In addition, the network information of the scrambler includes IP network information (such as an IP address and a port number) of the multiplexer (MUX) and the SCS (SimulCrypt Synchronizer) included in the scrambler. Network information of the scrambler or messaging server included in each broadcaster head-end and broadcaster head-end is stored in a database in the CAS center.

Thereafter, the CAS center manages subscriber identification associated information according to the BSID of each broadcaster Head-end (S320). In the subscriber identification association information, there is a subscriber ID for uniquely identifying a subscriber managed by a CAS center. 'Subscriber ID' assigns a subscriber ID to each subscriber included in each broadcaster's headend so that it is unique in all broadcaster headends using the CAS center.

Such a subscriber ID may be replaced with a 'group ID' for identifying a group to which the subscriber belongs and 'position information' within the group. That is, the subscriber may be identified by <subscriber ID> or by <group ID, position information>.

On the other hand, in the case of allocating the subscriber ID in the CAS center, it may be assigned to be a unique value in all broadcaster head-end, but may be assigned to be a unique value only in each broadcaster head-end. That is, the subscriber ID is assigned to be unique within the designated broadcaster's head-end, but combined with the BSID in the form of <BSID, subscriber ID> to eventually be uniquely identified by all broadcaster head-ends using the CAS center. Make sure

Therefore, the CAS center stores the association information between the BSID and the subscriber ID. The way you store association information

1) A method of storing a mapping table between BSID and subscriber ID

2) Assign and store the range of subscriber ID value differently for each BSID of broadcasting head-end (for example, assign BSID 1 to subscriber ID 1 ~ 100 and BSID 2 to subscriber ID 101 ~ 200) Can be divided into

Thereafter, the subscriber management unit (SMS) of the broadcaster Head-end transmits a subscriber management command to the SMS processing unit of the CAS center (S330).

The subscriber management command includes the BSID and the subscriber ID of the broadcaster head-end, and the SMS processing unit of the CAS center receives the subscriber management command and determines whether the subscriber belongs to the BSID (S340).

If the subscriber is included in the BSID, the SMS processing unit newly stores or updates the subscriber management information in the database, and requests the EMM generation unit to generate an EMM.

The EMM generator uses the EMM generator (EMMG) ↔ multiplexer (MUX) interface protocol of the DVB SimulCrypt standard to convert the generated EMM to the broadcaster head-end multiplexer with the BSID value included in the subscriber management command. The EMM is transmitted to the MUX at step S360. That is, the EMM generator uses the BSID to transmit EMMs, and the CAS center database stores IP network information (such as IP address and port number) of the multiplexer (MUX) associated with the BSID in advance. It is.

As described above, there is a method of searching for a multiplexer (MUX) of a broadcaster head-end using the BSID associated information to transmit the EMM generator generated EMM. However, the subscriber management unit (SMS) of the broadcaster head-end is found. Transmits the subscriber management command by specifying the BSID value of the other broadcaster's headend, the EMM generator may transmit the generated EMM to the multiplexer (MUX) included in the other broadcaster's headend. have.

4 is a flowchart of a first embodiment for delivering an EMM generated by a CAS center according to the present invention to a broadcaster Head-end. As shown in FIG. 4, the EMM generating unit retrieves network information of a multiplexer (MUX) included in a broadcaster head-end for transmitting the generated EMM, in a database (S361), and retrieves the multiplexer ( MUX) transmits an EMM generated using an IP address and a port number, which are IP network information (S362).

Thereafter, the multiplexer (MUX) of the broadcaster head-end may transmit the received EMM to the subscriber station or may transmit the received EMM to the subscriber station through the messaging server (S363).

5 is a flowchart of a second embodiment for delivering an EMM generated by a CAS center according to the present invention to a broadcaster Head-end. As shown in FIG. 5, the EMM generator retrieves network information of a messaging server included in a broadcaster head-end for transmitting the generated EMM, in a database (S364), and searches the network of the retrieved messaging server. The EMM generated using the information is transmitted (S365).

Thereafter, the messaging server of the broadcaster Head-end may transmit the received EMM to the subscriber station using another communication channel such as a mobile communication network instead of a broadcast channel (broadcast or multicast) (S366). .

That is, the broadcaster head-end may transmit the received EMM to the subscriber station through a broadcast channel (broadcast or multicast), and may receive the EMM through another communication channel such as a mobile communication network. ) Can be transmitted to the subscriber station.

In this case, when transmitting an EMM to a broadcast channel, a multiplexer (MUX) included in a scrambler of a broadcaster Head-end is used, and an EMM is transmitted through another communication channel such as a mobile communication network. In case of transmitting the message, the message is transmitted using a messaging server included in the broadcaster's head-end.

In this case, the EMM generator of the CAS center does not transmit the generated EMM to the multiplexer (MUX) included in the scrambler of the broadcaster Head-end, but directly to the messaging server in the broadcaster Head-end. The server delivers the EMM received to the subscriber station through the Short Message Service or a separate unicast channel. In this case, the network information of the multiplexer (MUX) included in the scrambler of the broadcasting head-end associated with the BSID is not stored in the database of the CAS center, and the network information of the messaging server is stored and received using the network information of the messaging server. The EMM transmits an entitlement management message (EMM) to the messaging server of the broadcaster head-end.

6 is a flowchart of a third embodiment for delivering an EMM generated by a CAS center according to the present invention to a broadcaster Head-end. As shown in FIG. 6, the EMM generator of the CAS center transmits an EMM generated by the subscriber management command transmitted by the subscriber management unit SMS of the broadcasting head-end to transmit the generated EMM to the broadcasting head-end. The response may be used (S367). That is, the EMM generation unit transmits the EMM to the subscriber management unit SMS of the broadcaster Head-end in response to the subscriber management command transmitted from the subscriber management unit SMS.

As a result, the EMM generation unit does not search for a separate network information for transmitting the generated EMM, but uses the network information of the subscriber management unit (SMS) included in the received subscriber management command. The management message (EMM) may be transmitted to the subscriber management unit (SMS).

The subscriber management unit (SMS) of the broadcaster head-end receives the EMM and transmits the received EMM to the subscriber station, and the multiplexer (MUX) included in the broadcaster head-end is included. Alternatively, the EMM is transferred to the messaging server (S368).

Thereafter, the multiplexer (MUX) or the messaging server transmits the EMM received from the subscriber management unit (SMS) to the subscriber station (S369).

FIG. 7 is a flowchart for generating and transmitting an EMT to a broadcaster Head-end according to a broadcast schedule in a CAS center according to the present invention. As shown in FIG. 7, the control unit of the CAS center allocates a BSID for each broadcaster Head-end and registers network information of a scrambler or messaging server included in the broadcaster Head-end (S410).

The CAS center needs to identify each broadcaster's head-end because it must work with systems in multiple broadcaster headends. To this end, BSID (Broadcasting System Identifier) is assigned to each broadcasting head-end to identify each broadcasting head-end.

In addition, the network information of the scrambler includes IP network information (such as an IP address and a port number) of the multiplexer (MUX) and the SCS (SimulCrypt Synchronizer) included in the scrambler. Network information of the scrambler or messaging server included in each broadcaster head-end and broadcaster head-end is stored in a database in the CAS center.

Thereafter, the CAS center manages service number association information according to the BSID of each broadcaster Head-end (S420). The service number association information relates to channel information managed by the broadcaster head-end. Each broadcaster head-end has one or more broadcast channels, and these broadcast channels are associated with the BSID of each broadcaster head-end. have. As a result, the control unit of the CAS center stores <BSID, service number>, which is service number association information associated with the BSID and each service number, in a database.

Thereafter, the program manager PMS of the broadcaster head-end transmits the broadcast program management information to the PMS processor of the CAS center (S430).

The broadcast program management information includes the configured broadcast channel and time schedule information of the broadcast program constituting the channel, and information on conditions (product, age, region, etc.) necessary for viewing the channel or program. In addition, the broadcast program management information includes the BSID and service number of the broadcaster Head-end.

The PMS processing unit of the CAS center determines whether the service number included in the received broadcast program management information is mapped to the BSID of the broadcaster head-end, and if so, the broadcast schedule stored in the database by using the broadcast program management information. And broadcast condition information is newly stored or updated (S440). On the other hand, if the service number is not mapped to the BSID of the broadcaster head-end, the PMS processor generates an error message for this and transmits it to the program manager (PMS) of the broadcaster head-end.

Subsequently, the SCS included in the scrambler of the broadcaster Head-end transmits a request for generation of a qualification control message (ECM) to the ECM generator of the CAS center (S450). The request for generating EMM is included in the service number, and the BSID of the broadcasting head-end is optionally included and transmitted.

The ECM generation unit of the CAS center searches for the broadcast schedule and the broadcast condition information by using the BSID and the service number included in the transmitted EMM generation request, and generates the EMM.

If the BSID is not included in the transmitted ECM generation request, the ECM generation unit is stored in the SCS network information and database of the broadcasting head-end of the broadcaster that sent the ECM generation request. Network information of the SCSs of the broadcaster head-ends is compared with each other, and the BSIDs of the broadcaster head-ends that are mapped are extracted and used for generation of a qualification control message (ECM).

The ECM generation unit forwards the generated EMM to the SCS of the head-end of the broadcaster (S470), and the SCS receiving the EMM is encrypted using the control word in the encryption unit (SCR). The broadcast content and the EMM are transmitted together to the subscriber station (S480).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

10, 100, 300: head-end 11, 140: program management unit (PMS)
12, 130: subscriber management unit (SMS) 20: CAS server
21, 210: database 22, 230: ECM generator
23, 260: PMS processing unit 24, 220: EMM generating unit
25, 250: SMS processing unit 30, 110: scrambler
31, 114: SCS (SimulCrypt Synchronizer)
32, 113: multiplexer (MUX) 33, 112: encryption unit (SCR)
34, 111: control word generator (CWG) 40: multiplexer
50: set-top box 51: demultiplexer (DEMUX)
52: descrambler 53: CAS client
200: CAS Center

Claims (30)

In the CAS service providing system,
An EMM generating unit for generating an EMM and transmitting the generated EMM to a broadcaster Head-end;
An ECM generation unit for generating a qualification control message (ECM) in response to a request for generating a qualification control message (ECM) transmitted from a SimCrypt Synchronizer (SCS) of the broadcaster Head-end;
An SMS processing unit for receiving a subscriber management command transmitted from a subscriber management unit (SMS) of the broadcaster Head-end and updating subscriber management information;
A PMS processor for updating a broadcast schedule and broadcast condition information using broadcast program management information transmitted from a program manager (PMS) of the broadcaster Head-end; And
Control unit for generating a broadcasting system identifier (BSID) for identifying the broadcaster head-end
CAS center comprising a.
The method of claim 1,
BSID, subscriber ID and subscriber status information of the broadcaster head-end generated by the controller, mapping information between the BSID and the subscriber ID, mapping information between the BSID and IP network information of the SCS included in the broadcaster head-end Mapping information between the BSID and IP network information of a multiplexer (MUX) included in the broadcaster headend, mapping information between the BSID and a service number included in the broadcaster headend, and the BSID and the broadcaster headend. And a database for storing at least one of mapping information between network information of a messaging server included, a broadcast schedule of the broadcaster head-end, and broadcast condition information.
The method of claim 2,
If the SMS processor determines that the subscriber ID transmitted from the subscriber management unit (SMS) of the broadcaster Head-end is mapped to the BSID stored in the database, the SMS processor generates an EMM from the subscriber management unit (EMM). CAS center, characterized in that requesting.
The method of claim 2,
The SMS processing unit generates an error message and transmits the generated error message to the subscriber management unit (SMS) when the subscriber ID transmitted from the subscriber management unit (SMS) of the broadcasting company Head-end is not mapped to the BSID stored in the database. CAS center.
The method of claim 2,
And the EMM generating unit transmits the generated EMM to any one of the subscriber management unit (SMS), the multiplexer (MUX), or the messaging server of the broadcasting head-end.
The method of claim 5, wherein
And transmitting the EMM to the multiplexer (MUX) by using mapping information between IP network information of the multiplexer (MUX) stored in the database.
The method of claim 1,
And the subscriber management command includes any one or more of the BSID, subscriber ID, or subscriber status information of the broadcaster head-end.
The method of claim 2,
And the PMS processor determines whether a BSID and a service number included in the received broadcast program management information are mapped to the BSID stored in the database, and updates the broadcast schedule and broadcast condition information.
The method of claim 2,
The request for generating the EMM may include at least one of a service number of the broadcaster head-end or the BSID.
The method of claim 9,
And the ECM generator retrieves the BSID of the broadcaster head-end stored in the database when the BSID is not included in the EMM generation request.
The method of claim 9,
The ECM generator retrieves the broadcast schedule and broadcast condition information from the database by using the BSID and service number of the broadcaster head-end, and uses the retrieved broadcast schedule and broadcast condition information to determine the EMM. After generating the CAS center, characterized in that for transmitting to the broadcast head-end SCS.
In the CAS service providing system,
A control word generator (CWG) for randomly generating a control word that encrypts broadcast content;
A multiplexer (MUX) for transmitting an EMM to an subscriber station, from the EMM generation unit of the CAS center; Wow
A SimulCrypt Synchronizer (SCS) for requesting generation of a credential control message (ECM) to an ECM generator of the CAS center; And
Encryption unit (SCR) for encrypting the broadcast content using the control word
Scrambler having;
A subscriber management unit (SMS) for transmitting a subscriber management command for a broadcast service subscriber to an SMS processing unit of the CAS center;
Program management unit (PMS) for transmitting broadcast program management information to the PMS processing unit of the CAS center
Broadcaster Head-end including.
The method of claim 12,
And the subscriber management command includes information on subscription or termination of a broadcast service subscriber, purchase or cancellation of the broadcast content.
The method of claim 12,
The subscriber management command includes a broadcasting system identifier (BSID) of the broadcasting head-end allocated from the CAS center.
The method of claim 12,
The broadcast program management information includes a broadcast channel configured, time schedule information of a broadcast program constituting the broadcast channel, and a condition for viewing a channel or a program.
The method of claim 12,
The broadcast program management information includes a broadcasting system identifier (BSID) of the broadcasting head-end allocated from the CAS center.
The method of claim 12,
And a messaging server for transmitting an EMM received through the EMM generation unit of the CAS center to a subscriber station using a mobile communication network.
Claims [1] A method for providing a CAS service in a CAS center storing at least one of a broadcasting system identifier (BSID) of a broadcasting company head-end and network information of at least one of a scrambler, a messaging server, and a subscriber management unit (SMS) corresponding to the BSID.
A first step of receiving, at an SMS processing unit of the CAS center, a subscriber management command transmitted from a subscriber management unit (SMS) of the broadcaster head-end;
A second step of determining whether the subscriber ID is mapped to the BSID by using the BSID corresponding to the broadcaster head-end and the subscriber ID included in the subscriber management command;
In the second step, when the subscriber ID is mapped to the BSID, the SMS processing unit requests the EMM generation unit to generate an EMM corresponding to the subscriber ID; And
A fourth step of transmitting the generated EMM to the broadcaster Head-end;
How to generate a credential management message in the CAS center comprising a.
The method of claim 18,
The mapping of the subscriber ID and the BSID in the second step is determined using the subscriber management information stored in the database of the CAS center.
The method of claim 18,
In the fourth step, the EMM generation unit transmits the EMM to any one of a multiplexer (MUX), a messaging server, or a subscriber management unit (SMS) of the broadcasting head-end corresponding to the BSID. To generate credential management messages at a CAS center.
The method of claim 20,
Generate an accounting management message at the CAS center using IP network information of the multiplexer (MUX) stored in the CAS center's database to send the EMM to the multiplexer (MUX) How to.
The method of claim 20,
And use the network information of the messaging server stored in the CAS center's database to send the EMM to the messaging server.
The method of claim 22,
Generating a credential management message at a CAS center using network information according to the reception of the subscriber management command to transmit the EMM to the subscriber management unit SMS of the broadcasting company Head-end; Way.
The method of claim 21,
When receiving the EMM from the multiplexer (MUX), characterized in that to transmit the EMM to the subscriber station using either the multiplexer (MUX) or a messaging server. To generate credential management messages at the CAS center.
The method of claim 22,
When the EMM receives the EMM from the messaging server, the EMM is transmitted to a subscriber station using either the multiplexer or the messaging server. How to generate credential management messages in CAS Center.
The method of claim 23,
When the subscriber management unit (SMS) receives the EMM, the subscriber management unit (SMS) receives the received EMM from either the multiplexer (MUX) or the messaging server. After receiving the EMM, the multiplexer (MUX) or the messaging server receiving the EMM receives the EMM from the subscriber station. How to generate a message.
Claims [1] A method for providing a CAS service in a CAS center storing at least one network information of a broadcaster system identifier (BSID) of a broadcaster head-end and a scrambler or a program management unit (PMS) corresponding to the BSID.
A first step of receiving, by the PMS processing unit of the CAS center, broadcast program management information including the BSID and a service number transmitted from the program management unit (PMS) of the broadcaster head-end;
A second step of determining, by the PMS processor, whether the service number maps to the BSID by using a BSID corresponding to the broadcaster head-end and a service number included in the broadcast program management information;
In the second step, when the service number is mapped to the BSID, the PMS processing unit performs any one or more of newly storing or updating the broadcast program management information in a database of the CAS center;
A fourth step of receiving, at the ECM generation unit of the CAS center, a request for generating a qualification control message (ECM) transmitted from the broadcast head-end's SimulCrypt Synchronizer (SCS);
A fifth step of retrieving a broadcast schedule and broadcast condition information corresponding to the broadcaster head-end to generate an eligibility control message (ECM); And
A sixth step of transmitting the generated EMM to the SCS;
How to generate an accounting control message in the CAS center comprising a.
The method of claim 27,
After the sixth step,
The SCS further includes a seventh step of transmitting the transmitted eligibility control message (ECM) to the subscriber station together with the broadcast content scrambled by the scrambler of the broadcaster Head-end. How to generate a message.
The method of claim 27,
The EMM generation request includes the service number of the broadcaster Head-end, and the BSID of the broadcaster Head-end is optionally included. How to.
The method of claim 29,
When the BSID is not included in the EMM generation request, the ECM generation unit checks the BSID through the network information of the SCS that transmitted the EMM generation request. To generate an accounting control message at a CAS center.

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