KR100668375B1 - An entitlement management messaging method and its system for conditional access management of broadcast service - Google Patents

Abstract

The present invention relates to an entitlement message and message transmission method for reception restriction management of a broadcast service, and more particularly, to receive a broadcast service from a terminal receiving a broadcast service transmitted through a unidirectional broadcast channel such as satellite, terrestrial wave, and cable. An entitlement message and message method for limiting.

In the method of transmitting an entitlement indication message for reception management of a broadcast service of the present invention, a first step of selecting a broadcast service for transmitting the entitlement indication message and transmitting an entitlement indication message for the broadcast service A second step of selecting a range of a group; a third step of selecting a group within the range of the group; a fourth step of confirming whether to purchase the broadcast service of the group selected in the third step; And a fifth step of setting a status code corresponding to, and a sixth step of generating and transmitting an entitlement indication message using the status code.

CAS, EMM, Broadcast Service, Restriction

Description

An entitlement management messaging method and its system for conditional access management of broadcast service

1 is a configuration diagram of a CAS server for transmitting an entitlement and a terminal for receiving an entitlement according to the present invention;

2 is a flowchart of a method for transmitting an entitlement indication message according to the present invention;

3 is a block diagram of a group according to an embodiment of the present invention;

4 is a flowchart of a method for transmitting an entitlement refresh message according to the present invention;

5 is a schematic diagram illustrating a method for transmitting an entitlement according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

120: service management unit 130: EMM generation unit

140: group management unit 150: EMM transmission management unit

220: EMM processing unit 230: EMM storage unit

240: broadcasting watching control unit 250: broadcasting watching unit

The present invention relates to an Entitlement Management Message (EMM) transmission system and a message transmission method for reception restriction management of a broadcast service, and more particularly, to a broadcast transmitted through a unidirectional broadcast channel such as satellite, terrestrial wave, and cable. The present invention relates to an entitlement management message transmission system and message transmission method for limiting broadcast service reception in a terminal receiving a service.

In general, an In-Band terminal must have an entitlement in the terminal in order to watch a specific channel or service, so for this purpose, a CAS (conditional access system) server for generating and transmitting an entitlement is required. Entitlement must be delivered using a common channel. Accordingly, the entitlement manager periodically transmits the entitlement state of the user, and thus the in-band terminal may hold the entitlement.

Entitlement information corresponding to each user may be represented in an on / off form, which may be represented by a size of '1 bit'.

In the In-Band terminal environment, when an Entitlement Management Message (EMM) is used to transmit entitlement information of each user in a form that each terminal can receive, the number of messages may increase. In addition, since the ratio of the remaining entitlement management message data (header, MAC, etc.) is larger than the 1-bit entitlement information, it is very inefficient. Therefore, the entitlement information collects one or more In-Band terminals and transmits them in group units.

Since each In-Band terminal knows its location information in the group to which it belongs and the parts belonging to the group, it can obtain entitlement information about itself by transmitting entitlement information in groups. .

The server bundles and transmits the entitlement information to each terminal for each entitlement in group units. Basically, when the number of entitlements is N and the number of groups is G, a total of N × G entitlement management messages are transmitted. This method requires very much bandwidth.

For example, the total number of terminals is 1,000,000, each group consists of 256, and there are 3,907 groups in total, the number of entitlements to be transmitted is 5, and the entitlement management message delivers the entitlements. If the size of 60 bytes, each terminal wants to receive the entitlement information within 2 minutes, the required frequency bandwidth is as follows.

76.31 Kbits / s is never small and there is a problem that the frequency bandwidth increases by 15.26 Kbits / s for each increase of entitlement.

The present invention configures and transmits entitlement information according to a group configured based on an entitlement retention characteristic of a terminal user on an in-band. An object of the present invention is to provide an entitlement management message transmission system and a message transmission method.

According to an aspect of the present invention, there is provided a method of transmitting an entitlement indication message for reception management of a broadcast service, comprising: a first step of selecting a broadcast service for transmitting the entitlement indication message and an entitlement indication for the broadcast service; A second step of selecting a range of a group to transmit a message to, a third step of selecting a group within the range of the group, and a fourth step of confirming whether to purchase the broadcast service of the group selected in the third step; A fifth step of setting a status code corresponding to the purchase or not and a sixth step of generating and transmitting an entitlement indication message using the status code.

Another object of the present invention is a casing system for transmitting an entitlement management message for broadcast service reception restriction management, comprising: a group manager configured to divide one or more terminals receiving the entitlement management message into groups and parts; And an entitlement management message generation unit for generating an entitlement management message corresponding to the group and part configured in the group management unit, and for repeatedly delivering the entitlement management message generated by the entitlement management message generation unit. It is achieved by the entitlement management message transmission management unit for managing the transmission schedule.

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

Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principles that can be defined, it should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention.

1 is a block diagram of a CAS server 100 for transmitting an entitlement management message and a terminal for receiving an entitlement management message according to the present invention. As shown in FIG. 1, the CAS server 100 includes a broadcast manager 110 for managing a generated broadcast signal, a service manager 120 for managing a broadcast service requested by a user, and grouping user terminals in groups. Group management unit 140 for managing the divided parts and subdividing each group and the EMM (Entry for generating an entitlement management message of the broadcast service to the user's terminal when the user applies for any one of the broadcast service) Title Management Message) EMM transmission management unit 150 for managing the transmission of the entitlement management message generated by the generation unit 130 and the EMM generation unit 130 and broadcast data transmitted from the broadcast management unit 110 and EMM A broadcast transmitter for transmitting the EMM transmitted from the transmission manager 150 to user terminals.

The broadcast manager 110 performs a function of delivering a broadcast service to the broadcast transmitter 160 according to a broadcast schedule for a broadcast service such as video and audio. In addition, the broadcast management unit 110 may selectively encrypt or scramble for the service fee.

The service manager 120 manages the purchase or cancellation of the broadcast service of the user and stores or manages the broadcast service history information purchased by each user.

The group manager 140 allocates the group address, the part address, and the identification order information in the part to which the user terminal belongs, and stores or manages this information.

The EMM generating unit 130 generates a corresponding entitlement management message according to a delivery period of various entitlement management messages generated according to a broadcast service request and cancellation.

The EMM transmission management unit 150 manages a schedule for repeatedly transmitting various entitlement management messages generated by the EMM generation unit 130, and transmits the entitlement management message generated for transmitting the entitlement management message to the broadcast transmitter ( 160).

The broadcast transmitter 160 transmits various entitlement management messages received from the EMM transmitter and the broadcast service received from the broadcast manager 110 to any one or more of unidirectional broadcast channels of satellite, terrestrial wave, and cable. .

The user terminal is an EMM processing unit for analyzing a broadcast service unit 210 for receiving a broadcast service and various entitlement management messages transmitted from the CAS server 100 and various entitlement management messages including an entitlement of the corresponding broadcast service. Broadcast to manage the viewing of the broadcast service by the entitlement of the broadcast service stored in the EMM storage unit 230 and the EMM storage unit 230 and the EMM storage unit 230 and the corresponding analysis analyzed by the EMM processing unit 220 The broadcast control unit 240 and the broadcast receiving unit 210 is provided with a broadcast viewing unit 250 for providing a user with the management according to the management of the broadcast viewing control unit 240.

The broadcast receiver 210 performs a function of receiving a broadcast service transmitted through a unidirectional broadcast channel such as satellite, terrestrial wave, and cable and an entitlement management message including various entitlements.

The EMM processor 220 analyzes various entitlement management messages received from the broadcast receiver 210 to determine whether it can have an entitlement, and if so, transmits the corresponding entitlement to the EMM storage unit 230. Function to save safely.

The EMM storage unit 230 stores the entitlement delivered by the EMM processing unit 220.

The broadcast viewing controller 240 checks whether an entitlement to be retained in order to watch the broadcast service when the user selects a specific broadcast service exists in the EMM storage unit 230, and holds the corresponding entitlement. In order to allow the viewing of the broadcast service, the broadcast viewing unit 250 transmits a command. In addition, if there is no corresponding title, a function of controlling not to watch a broadcast is performed.

The broadcast viewing unit 250 provides a broadcast service to a user when the broadcast viewing control unit 240 allows viewing of a broadcast service. In the case of paying broadcast services, reverse encryption or reverse scrambling may be selectively performed.

The entitlement according to the present invention is performed by being included in five entitlement management messages as follows.

First, an Entitlement Instant EMM (EI EMM) includes an identifier of a user terminal that purchased an entitlement and an entitlement identifier purchased by the corresponding user. The EI EMM may describe only the currently purchased entitlement identifier or all entitlement identifiers owned by the user at this time.

The EI EMM may not be delivered, may be delivered once, or may be repeatedly delivered for a predetermined period according to the configuration of the CAS server 100. In the case of repetitive transmission, a recurring schedule period may also be specified in the CAS server 100. The ED EMM and ER EMM (entitlement management messages driven and delivered by the delivery cycle independently of the user's entitlement purchase event) are delivered after the user has purchased the entitlement. Since the contents are reflected and transmitted, the terminal may retain the purchased entitlement after a certain time without necessarily transmitting the EI EMM. However, in this case, the CAS server 100 may allow the EI EMM to be sent immediately after the purchase of the entitlement since the user who purchased the entitlement may want to receive the entitlement immediately after purchase. have.

In addition, when the EI EMM is repeatedly transmitted for a certain period of time as a reception failure for one transmission is expected, it should be delivered in a shorter period than that of the ER EMM.

If you transmit at the same interval as the ER EMM, the effectiveness of the EI EMM is already lost.

Second, a disentitlement instant message (DI EMM) is transmitted to a terminal of a corresponding user to delete an entitlement from the corresponding terminal due to the expiration or cancellation of the broadcasting service of the corresponding terminal user. The DI EMM includes an identifier of the user terminal and an entitlement identifier to be deleted. In the case of the DI EMM, as in the case of the EI EMM, the DI EMM can be repeatedly transmitted because the state of the user terminal cannot be checked.

Third, when deleting all entitlements of a specific subscriber due to termination of all broadcasting services of a specific subscriber, an ENT entitlement deletion message (ADI EMM: All Disentitlement Instant EMM) is transmitted. The ADI EMM contains only the identifier information of the receiving terminal, which implicitly means that all entitlements existing in the user terminal should be deleted. The ADI EMM may also be repeatedly transmitted by the CAS server 100, and the repetition period and the number may be adjusted by the CAS server 100.

Fourth and fifth, there is an Entitlement Directive message (ED EMM) and an Entitlement Refresh message (ER EMM), which are messages that periodically inform the presence or absence of an entitlement. Unlike EI EMM, DI EMM, and ADI EMM, ED EMM and ER EMM target more than one group.

The CAS server 100 includes EI EMM, DI EMM, ADI EMM, ED EMM, and ER EMM. When a terminal user purchases a specific entitlement, the CAS server 100 receives an EI for receiving the corresponding terminal. EMMs can be selectively delivered over in-band channels. The EI EMM includes all the entitlements that a user has at the time of serialization, including the identifier of the purchased user terminal and the entitlement identifier that the user purchased (describe only the currently purchased entitlement or the entitlement purchased now). Can be described).

2 is a flowchart of a method for transmitting an entitlement indication message in accordance with the present invention. As shown in FIG. 2, one broadcast service is selected for ED EMM transmission to a terminal included in a CAS server (S305). The broadcasting service includes a broadcasting service of a pay channel and a broadcasting service of a free channel, and the terminal must have an entitlement of the broadcasting service to watch the broadcasting service.

After selecting a broadcast service for transmitting an ED EMM, a range of a group to which one ED EMM is included for the selected broadcast service is designated (S310).

Thereafter, after selecting one group in the predetermined group (S315), the purchase state of the selected broadcast service of the users belonging to the selected group is checked (S320).

As a result of the purchase status check, if the ER EMM should be delivered to the terminal belonging to the selected group, or if the terminals in the corresponding group are deactivated for the broadcast service, the status code of the selected group is designated as '00' (S325).

In addition, when any user belonging to the selected group does not purchase the selected broadcast service as a result of the purchase state check, the status code of the selected group is designated as '01' (S330).

In addition, when all users belonging to the selected group have purchased the selected broadcast service as a result of the purchase state check, the status code of the selected group is designated as '10' (S335).

In addition, if the service purchase status of the user belonging to the selected group has not changed since the ER EMM of the selected group is transmitted as the result of the purchase status check, the status code of the selected group is designated as '11' ( S340).

If all of the status codes for the selected group are specified (S345), the ED EMM is generated using the status codes of each group of the group range determined for the selected broadcast service (S350) and transmitted (S355).

If the status codes of all groups within the range of the predetermined group are not specified (S345), the flow moves to step S315 to select another group within the range of the predetermined group, and performs the subsequent steps again.

In addition, after step S355, it is determined whether the ED EMM including the status codes of all groups is generated and transmitted for the selected broadcast service (S360), and if the ED EMM including the status codes is not transmitted to all groups, step S310. Next, by specifying the group range to be included in one ED EMM for the selected broadcast service, the following steps are performed.

However, when the ED EMM including the status code is transmitted to all groups for the broadcast service selected in step S360, the next step is performed.

Subsequently, it is determined whether the ED EMM is transmitted for all broadcast services (S365). If the ED EMM for all broadcast services is not transmitted, the process moves to step S305 to select one broadcast service that is not selected from other broadcast services. And perform the subsequent steps again.

If the transmission of the ED EMM for all broadcast services is completed in step S365, the transmission of the ED EMM is terminated.

3 is a block diagram of a group according to an embodiment of the present invention. As shown in FIG. 3, when the total number of groups is 1,024, each group has two parts, and the number of parts that can be expressed in one ED EMM is 512, the number of ED EMMs is four.

In addition, the transmission order of the ED EMM as shown in Figure 3 is as follows. The total number of groups is 1,024 and each group can have up to two parts. In this case, the part having the group ID 1 and the part Index 1 does not need to transmit the entitlement management message for this part by canceling the service to which all the configuration terminals are subscribed. Since the parts having group IDs 514 to 1,023 among the parts having part index 1 are inactive parts that have not yet used a broadcast service, there is no need to transmit an entitlement management message for these parts.

In this case, the number of ED EMMs to be delivered is four, and the ED EMMs are transmitted in the following order.

First, the ED EMM 1 for the part with group ID 0 to 511 and part index 0 is sent.

Secondly, the ED EMM 2 for the part with group IDs 512 to 1,023 and part index 0 is sent.

Thirdly, the ED EMM 3 for the part having group IDs 0 to 511 and part index 1 is transmitted. At this time, the status code of the part having the group ID 1 and the part Index 1 has a value of '00' and no separate ER EMM is transmitted.

Fourth, after the ED EMM 3 is transmitted, the ED EMM 4 for the part with group IDs 512 and 513 and part Index 1 is transmitted.

4 is a flowchart of a method for transmitting an entitlement refresh message in accordance with the present invention. As shown in FIG. 4, a broadcast service for transmitting an ER EMM is selected (S405), and a group for transmitting an ER EMM for the selected broadcast service is selected (S410).

If it is determined whether the terminal belonging to the selected group has the entitlement of the broadcast service (S415), the terminal belonging to the group has purchased all the entitlement of the broadcast service, or if not all of them, According to the purchase state, the ER EMM is generated according to whether the selected group holds the entitlement (S420) and transmitted to the corresponding terminal (S425).

After transmitting the ER EMM, it is determined whether the purchase status of all the groups is checked for the selected broadcast service (S430), and if the purchase status of all the groups is not checked, the process moves to step S410, where a single broadcast service is selected. Select one group to create the ER EMM and repeat the following steps.

If the purchase status of all groups is checked for the selected broadcast service, step S430 is performed.

After performing the purchase state check process of all groups in step S430, it is determined whether to generate and transmit the ER EMM for all broadcast services (S435), if not generating the ER EMM for all broadcast services, go to step S405 To select one broadcast service among other broadcast services for ER EMM transmission, and perform the subsequent steps again.

If ER EMMs for all broadcast services are transmitted, transmission of the ER EMM is terminated.

5 is a schematic diagram illustrating a method for transmitting an entitlement according to an embodiment of the present invention. The ED EMM is repeatedly transmitted at each refresh cycle. The refresh cycle of the ED EMM is referred to as ED_EMM_Refresh_Period. The number of ED EMMs to be delivered in one cycle is CEILNG (the total number of groups / number of groups represented by one ED EMM). For example, if the number of groups that can be represented in an ED EMM is 4,096, each group has two parts, and the total number of groups is 8,192, four ED EMMs are required, and these four ED EMMs within ED_EMM_Refresh_Period Must be sent. Refresh of ER EMM is basically transmitted every fixed period (representing ER EMM's Refresh period as ER_EMM_Refresh_Period) .However, when the change of entitlement status of terminal in part occurs, ER EMM for the part is repeated every ED_EMM_Refresh_Period period for a certain period. send.

This constant period is called ER_EMM_RLD (Run Length Duration). ER_EMM_Refresh_Period is usually a positive integer multiple of ED_EMM_Refresh_Period. For example, suppose that the maximum time a user can wait to receive an entitlement is 2 minutes. ED_EMM_Refresh_Period can be 2 minutes, and ER_EMM_Refresh_Period can be 4 minutes or 2 minutes, or 6 minutes.

The reason why the refresh period of the ER EMM is used as the period of ED_EMM_Refresh_Period during ER_EMM_RLD when a change in the entitlement state of the terminal in the part occurs is as follows. When a particular user purchases an entitlement, the server delivers an EI EMM and assumes that this user has not received this EI EMM. If the ER EMM is refreshed and sent every ER_EMM_Refresh_Period, the maximum time this user has to wait to receive an entitlement to watch is ER_EMM_Refresh_Period. If a user refreshes the ER EMM at the ED_EMM_Refresh_Period cycle since the user purchased the entitlement, the maximum wait time is ED_EMM_Refresh_Period. Normally, ED_EMM_Refresh_Period is less than ER_EMM_Refresh_Period, so the user has to wait less time. However, if the user's terminal does not receive the ER EMM in ER_EMM_RLD and the user's terminal receives the ER EMM after the ER_EMM_RLD time has elapsed, the maximum time may be ER_EMM_Refresh_Period. Usually ER_EMM_RLD has a very long time (e.g., 6 hours, 12 hours, 24 hours, etc.) so this is unlikely to be very small. After a user purchases an entitlement, the ER EMM is refreshed at a period of ER_EMM_Refresh_Period after the RLD (ER_EMM_RLD) has passed.

That is, as shown in FIG. 5, all terminals of groups A and C have entitlements until time T_2, and all terminals of group B do not have entitlements. The status code of C has '10', '01', and '10'. Separate groups of ER EMMs are not delivered to groups A, B, and C. However, only some of the groups D have entitlements, so ER EMMs are delivered separately. When some terminals of the group C purchase an entitlement in Event_2, the ER EMM for the group C is separately delivered from this time. During the ER_EMM_RLD period, the ER EMM for group C is refreshed at a period of ED_EMM_Refresh_Period. In ED EMM delivered at time T_2, the status code for group C is designated as '00', but from time T_3, it is designated as '11' because ER EMM of group C is delivered once before time T_3.

From T_6, when ER_EMM_RLD of group C has passed, the ER EMM for group C is refreshed at a cycle of ER_EMM_Refresh_Period. The ER EMM in group D is refreshed at the ER_EMM_Refresh_Period cycle until Event_3 occurs, but is refreshed at the ED_EMM_Refresh_Period cycle from T_5 to T_9. Although not shown in FIG. 5, when Event_2 and Event_3 occur, the EI EMM for the user who purchased the entitlement may be refreshed and transmitted for a predetermined period of time.

Although the present invention has been shown and described with reference to the preferred embodiments as described above, it is not limited to the above embodiments and those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

Accordingly, the present invention is to solve the problems of the prior art, and to group the terminals receiving the broadcast service, rather than simply transmitting the entitlement to limit the reception of the broadcast service on the in-band, and the broadcast service of the group By generating a status code according to a purchase characteristic and transmitting an entitlement management message with respect to the status code, waste of transmission bandwidth due to unnecessary data transmission can be reduced.

Claims (14)

In the method for transmitting an entitlement indication message for reception management of a broadcast service, Selecting a broadcast service for transmitting the entitlement indication message; Selecting a range of a group to transmit an entitlement indication message for the broadcast service; Selecting a group within the range of the group; A fourth step of confirming whether to purchase the broadcast service of the group selected in the third step; A fifth step of setting a status code corresponding to the purchase or not; And A sixth step of generating and transmitting an entitlement indication message using the status code; Entitlement indication message transmission method for reception restriction management of a broadcast service comprising a. The method of claim 1, The group is a method of transmitting an entitlement indication message for reception restriction management of a broadcast service including a plurality of parts. The method of claim 2, The part includes one or more terminals, and the terminals transmit an entitlement indication message for reception restriction management of a broadcast service having the same group ID. The method according to claim 1 or 2, The status code is represented by 2 bits, An entitlement refresh message should be transmitted to the part or a terminal of the part does not use a broadcast service; All terminals of the part purchasing the broadcast service; Not all terminals of the part purchasing the broadcast service; And After the entitlement refresh message is transmitted, an entitlement state of the broadcast service of all terminals in the part has not changed. Entitlement indication message transmission method for reception restriction management of a broadcast service comprising a. The method of claim 1, wherein after the fifth step, If the status code is not set for all groups within the range of the group selected in the third step, performing the third step again Entitlement indication message transmission method for reception restriction management of a broadcast service further comprising. According to claim 1, After the sixth step, Redoing from the second step to the sixth step if an entitlement indication message including the status codes of all groups for the broadcast service is not generated or transmitted; Entitlement indication message transmission method for reception restriction management of a broadcast service further comprising. The method of claim 6, wherein after the second step to the sixth step, If the entitlement indication message for all broadcast services has not been generated or transmitted, re-executing the first to sixth steps Entitlement indication message transmission method for reception restriction management of a broadcast service further comprising. A casing system for transmitting an entitlement management message for broadcast service reception restriction management, A group manager configured to divide one or more terminals receiving the entitlement management message into groups and parts; An entitlement management message generation unit for generating an entitlement management message corresponding to the group and part configured in the group manager; And Entitlement management message transmission management unit for managing a transmission schedule for repetitive delivery of the various entitlement management messages generated by the entitlement management message generation unit Entitlement management message transmission system for reception restriction management of a broadcast service comprising a. The system of claim 8, wherein the casing system is A service manager for managing a user's purchase or cancellation of a broadcast service and storing broadcast service history information purchased by the user; A broadcast transmitter for transmitting an entitlement management message generated by the entitlement management message transmission management unit to a user terminal; And Broadcast management unit for delivering the broadcast service to the broadcast broadcast transmitter according to the broadcast schedule The entitlement management message transmission system for reception restriction management of a broadcast service further comprising. The method of claim 9, The broadcast service transmitted from the broadcast transmitter is an entitlement management message transmission system for reception restriction management of a broadcast service transmitted using any one or more of a unidirectional broadcast channel of satellite, terrestrial wave, and cable. The method of claim 9, The broadcast management unit is an entitlement management message transmission system for the reception restriction management of a broadcast service for selectively encrypting or scrambled the broadcast service to pay for the broadcast service. The method of claim 9, The entitlement management message is an entitlement management message transmission system for managing the reception restriction of a broadcast service that is deleted from the received user terminal when a message duration expires. The method of claim 12, The entitlement management message is When an entitlement is purchased from the user terminal, an entitlement generation message including an identifier of the corresponding user terminal and the entitlement identifier and transmitted to the user terminal; An entitlement deletion message transmitted when the use of the broadcast service expires or is canceled, including an identifier of a corresponding user terminal and an entitlement identifier to be deleted; An all-entitlement deletion message transmitted including identifier information of the corresponding user terminal when all broadcasting services are terminated; An entitlement indication message including a status code indicating an entitlement holding state of the user terminal and transmitted to a corresponding group or part of the user terminal; And Entitlement refresh message transmitted to the group or part of the user terminal according to the status code Entitlement management message transmission system for reception restriction management of a broadcast service comprising a. The method of claim 13, The entitlement generation message is an entitlement management message transmission system for controlling the reception restriction of a broadcast service including only the currently purchased entitlement or including all the entitlements currently owned by the user terminal.

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