JP2002218425A - Individual information transmission system, and transmitter and receiver used for the individual information transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the utilization efficiency of a transmission line by reducing the number of repeatedly transmitting times of individual information. SOLUTION: A receiver 100 side decides whether or not to acquire the individual information 10 received from a transmitter 1 in a device and to process the individual information, and generates acquisition confirmation information 50 to transmit the acquisition confirmation information 50 to the transmitter 1 in the case of deciding that individual information should be acquired. Meanwhile, the transmitter 1 side controls repeated transmission to the receiver 100 decided to have been already acquired the individual information 10 based on the transmitted acquisition confirmation information 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television transmission system and, more particularly, to a transmission system for individual information (for example, individual information (EMM) and an EMM individual message) for a receiving device in a conditional access system and a receiving device. The present invention relates to an individual information transmission method capable of providing a control method, and a transmission device and a reception device used in the individual information transmission method.

[0002]

2. Description of the Related Art Conventionally, when broadcasting is performed using a conditional access system, a basic function of the system includes a scramble key (Ks) serving as a parameter of a system for scrambling a signal and attribute information of each program. Program information (EC
M) and related information called individual information (EMM) including a work key (Kw) as a key for encrypting and sending this ECM to the receiving device and contract information of each individual. , There is a function to process.

[0003] Here, the ECM is sent in common to all the receiving devices, but the EMM is a master key (K) unique to each receiving device.
m) and sent individually.

It has also been practical to send an individual message for each receiving device using this function.

[0005] These techniques are described, for example, in the standard specification "BS digital broadcasting limited reception system" (ARIB STD-B25) of the Association of Radio Industries and Businesses (ARIB).

FIG. 3 shows a configuration example of a conventional transmission system for transmitting individual information.

[0007] The transmitting device 1 repeatedly transmits the individual information (EMM) 10 to each receiving device 100 using the conditional access system.

After the individual information 10 is generated in the individual information generation unit 2, the transmission unit 3 multiplexes the individual information 10 into an MPEG-2 Systems transport stream (TS) and transmits it via various transmission paths. You.

As described above, the conventional individual information 10 is repeatedly transmitted to all the receiving devices during a certain period. Note that an IC card 200 for receiving device identification can be attached to each receiving device 100.

[0010]

When information (individual information 10 or the like) is individually transmitted to each of the receiving devices 100, a method of transmitting the information by radio waves, which is one of the methods of transmitting the information, is inexpensive.

However, in such a transmission method, since power is turned on to all the receiving apparatuses 100 and it is not reported that they are not tuned, it is possible to repeatedly transmit to all the receiving apparatuses 100 during a certain period of time. It is necessary, and furthermore, it is not possible to reliably notify each receiving device 100 that the power is not turned on continuously.

In general, in the standard of the conditional access system of digital broadcasting, a receiving device is provided with an energy saving measure called an energization control system, and the individual information (EMM)
In order to receive radio waves at the time of updating, a measure has been taken to reduce the time for energizing the receiving device.

However, since the transmitting side cannot know whether or not the receiving apparatus has received the EMM, regardless of whether or not the receiving apparatus has received the EMM, all the receiving apparatuses are transmitted for a certain period of time. Each individual information had to be repeatedly transmitted.

As a result, the capacity of individual information occupies a considerable proportion of the total transmission capacity, which hinders efficient use of the transmission path.

[0015] For example, a method is adopted in which the transmission period of the EMM to the same receiving device is one hour, and the transmission is continuously performed for about one month. This design is based on the premise that there is always one reception of the broadcast channel for about one hour at least once a month.

In the case of this example, even if the signal is received in the first transmission, the data is continuously transmitted to the receiving device 24 × 30 = 720 times, resulting in a large loss in transmission capacity.

Such a situation is particularly problematic in a system in which the data transmission capacity is limited, such as digital terrestrial audio broadcasting.

As described above, the individual information (EMM) transmitted using the conventional conditional access method cannot be used because the transmitting apparatus on the transmitting side cannot know whether the receiving apparatus has received the individual information. Regardless of whether the individual information has already been received or not, it is necessary to repeatedly send each information to all the receiving devices during a certain period, which hinders efficient use of the transmission path. I was

An object of the present invention is to provide an individual information transmission system capable of reducing the number of times of repetitive transmission of individual information and improving the efficiency of use of a transmission path, and a transmission system used in the individual information transmission system. A device and a receiving device are provided.

[0020]

SUMMARY OF THE INVENTION The present invention relates to an individual information transmission system for transmitting individual information by conditional access broadcasting, wherein the individual information is repeatedly transmitted from a transmitting device to a plurality of receiving devices. Sending means, receiving means for receiving the sent individual information in each of the receiving devices, acquisition determining means for determining whether to receive and process the received individual information in the receiving device, When it is determined that the individual information is acquired in the receiving device, a generating unit that generates acquisition confirmation information indicating that the individual information is acquired, and the generated acquisition confirmation information is transmitted from the receiving device to the transmitting device. Confirmation information transmitting means for transmitting the individual information to the receiving apparatus; and determining means for determining whether there is a receiving apparatus that has acquired the individual information based on the transmitted acquisition confirmation information. Based on, by equipped with a transmission control means for controlling the repeated delivery to the receiving device which has obtained the individual specific information, constituting the individual information transmission method.

Here, an IC that can be mounted on each of the receiving devices
A card, wherein the generation unit performs an encryption process on the acquisition confirmation information using a key unique to the IC card, and the determination unit converts the acquisition confirmation information into a key corresponding to the encryption process. May perform the decoding process.

The receiving device is configured as a device in which a communication path for transmitting information to the transmitting device is not always connected, and is stored in the receiving device when the communication path is connected to the receiving device. After transmitting the latest information and decoding the transmitted latest information, the transmitting device may reduce or end the frequency of repeated transmission to the receiving device thereafter.

The present invention is used in the above-mentioned individual information transmission system, and comprises a transmission device in the individual information transmission system, comprising the individual information transmission means, the determination means, and the transmission control means. I do.

The present invention uses the above-mentioned individual information transmission system, and comprises the receiving unit, the acquisition determining unit, the generation unit, and the confirmation information transmission unit in the individual information transmission system. And a receiving device.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. (Outline) First, an outline of the present invention will be described.

The present invention relates to a transmission system for repeatedly transmitting individual information to a receiving device in conditional access broadcasting, and to control of a transmitting device and a receiving device applied to the transmission method.

That is, the receiving device that has received the individual information (hereinafter referred to as individual information) sends back confirmation information indicating that the individual information has been received to the transmitting device, which is the transmitting side, using some transmission means. In, the transmission amount of the entire individual information can be suppressed by controlling the subsequent repeated transmission of the individual information to the receiving device based on the confirmation information.

The present invention is also directed to an in-vehicle receiving device (ie, a receiving device in which a communication path for transmitting information to a transmitting device is not always connected) as a main use of terrestrial digital audio broadcasting. And in such a case,
It is necessary to shorten the repetition period of information transmission from the relationship with the driving time of the vehicle, and the relationship with the data transmission capacity becomes important.

(Specific Example) Hereinafter, a specific example will be described.

An example of the individual information transmission system according to the present invention will be described with reference to FIGS.

(System Configuration) FIG. 1 shows a configuration example of an individual information transmission system. The description of the same parts as those in the system of FIG. 3 described above is omitted, and the same reference numerals are given.

The present system comprises a transmitting device 1 for repeatedly transmitting individual information 10 and a plurality of receiving devices 100 for returning acquisition confirmation information 50 indicating that the transmitted individual information 10 has been obtained. .

(Transmitting side) The transmitting device 1 includes an individual information generating unit 2 for generating individual information 10, a transmitting unit 3 for controlling transmission of the generated individual information 10, and acquisition confirmation information 5.
And a totaling server 4 that totals 0.

The transmitting section 3 has a function of transmitting the individual information 10 generated by the individual information generating section 2 based on the determination result totalized by the totaling server 4. in this case,
It has a function of reducing the transmission frequency of the individual information 10 or terminating the transmission to the already-acquired receiving device 100 that has acquired the individual information 10.

The transmitting unit 3 includes a CPU for performing overall control of the entire apparatus, an area for storing a control program (see FIG. 2 described later) and data according to the present invention, and for performing various arithmetic processing. Storage area (ROM / R
AM etc.).

The counting server 4 counts the acquisition confirmation information 50 returned from each of the receiving devices 100, decodes the acquisition confirmation information 50, and obtains the acquired acquisition device 100 that has acquired the individual information 10. It has a function of determining whether or not it exists, and transmitting the determination result to the transmitting unit 3.

(Receiving side) The receiving apparatus 100
1, an acquisition determination unit 102, a generation unit 103, and a confirmation information transmission unit 104.

The receiving section 101 has a function of receiving the individual information 10 transmitted from the transmitting device 1. Note that, similarly to the transmission unit 3, the reception unit 101 is provided with a storage area for storing a CPU, a control program according to the present invention (see FIG. 2 described later), and the like.

The acquisition determining unit 102 receives the individual information 1
It has a function of comparing “0” with the identification information and determining whether or not to obtain it in the device.

The generation unit 103 has a function of generating the acquisition confirmation information 50 indicating that the individual information 10 has been acquired, when it is determined that the individual information 10 is to be acquired.

The confirmation information transmitting unit 104 has a function of transmitting the generated acquisition confirmation information 50 from the receiving device 100 to the transmitting device 1. The acquisition confirmation information 50 is sent to the transmitting device 1 via the uplink 60 or the like.

(System Operation) Next, the operation of the transmission system will be described.

Here, an example in which the transmission of the individual information 10 is controlled using the acquisition confirmation information 50 will be described.

In the case where a broadcast in which the individual information 10 is repeatedly transmitted from the transmitting apparatus 1 to each of the receiving apparatuses 100 is performed using the conditional access system, in each of the receiving apparatuses 100, the receiving unit 1
01, it is confirmed that the individual information 10 has been received, the acquisition determining unit 102 compares the business entity identification information and the update number information of the received individual information 10 with the previous information, and stores the information in the apparatus based on the comparison result. Determine whether to acquire and process. When it is determined that the individual information 10 is to be acquired, the acquisition unit 103 generates the acquisition confirmation information 50 indicating that the individual information 10 has been acquired, and acquires the acquisition information indicating that the individual information 10 has been received by the transmission apparatus 1 through the confirmation information transmission unit 104. Confirmation information 5
Notify 0.

In accordance with this notification, in the transmitting device 1, the acquisition confirmation information 5 from each receiving device 100 is
0 is counted and the content is decrypted, whereby it is determined whether or not the already-received receiving device 100 that has acquired the individual information 10 exists.

Based on the determination result, the individual information 10 generated by the individual information generating unit 2 is transmitted by the transmitting unit 3 to the transmitting frequency of the individual information 10 to the receiving apparatus 100 which has already acquired the individual information 10. It is lowered or its transmission is terminated.

(Individual Information) Here, the individual information 10 will be described.

The individual information 10 using the acquisition confirmation information 50
In the example of the transmission system that controls transmission of the individual information 10, the receiving device 100 that has received the individual information 10 sends out the acquisition confirmation information 50 that the individual information 10 is surely acquired to the transmitting device 1 using some uplink 60. This acquisition confirmation information 5
0 is sent back from the transmitting device 1 to the receiving device 100
The individual information 10 transmitted to the user includes, for example, information having the following contents. a) Information for identifying that the individual information 10 has been updated in the receiving device 100 b) Information for specifying the return destination of the information related to the reception confirmation in the receiving device 100 c) Checking the falsification of the acquisition confirmation information 50 Information for Prevention On the transmitting apparatus 1 side, after confirming that the individual information 10 for the receiving apparatus 100 has been correctly received by the acquisition confirmation information 50, the individual information 1 for the receiving apparatus 100 is checked.
By reducing the frequency of the repeated transmission of 0 or terminating the transmission, the transmission amount of the entire individual information 10 can be suppressed.

(Example of Processing) Next, the transmission control processing of the present system will be described with reference to the flowchart of FIG.

The transmission control of the individual information 10 based on the acquisition confirmation information 50 in the transmitting apparatus 1 and the processing of receiving the individual information 10 and generating the acquisition confirmation information 50 in the receiving apparatus 100 will be described.

First, the processing on the transmitting device 1 side will be described.

In step S 1, information (= destination information) necessary for returning the acquisition confirmation information 50 in the receiving apparatus 100 is stored in, for example, a variable section (= EMM) of the individual information 10.
In the function information arranging section) in the descriptor format.

In step S2, the individual information 10 including the destination information is repeatedly transmitted to each of the receiving devices 100.

Next, processing on the receiving apparatus 100 side will be described.

In step S3, the individual information 10 repeatedly transmitted is received.

In step S4, it is checked whether or not there is any piece of the individual information 10 received and temporarily stored that matches the card ID. If there is a match, the process proceeds to step S5; otherwise, the process proceeds to another process.

In step S5, the business entity identification information and the update number of the received individual information 10 are temporarily stored in the storage area.

In step S6, the update number of the stored individual information is confirmed.

In step S7, it is checked whether the confirmed update number has been updated by comparing it with the previous one. If it has been updated, the process proceeds to step S8, and if it has not been updated, the process proceeds to another process.

In step S8, if the data has been updated,
The broadcast business entity to which the updated information belongs and the update number of the individual information 10 are stored in the receiving device 100.

Thereafter, the stored data is transferred to the IC card 200 loaded in the receiving device 100. When the transferred data is correctly decrypted in the IC card 200, the updated information is stored in the IC card 200. Then, it responds to the receiving device 100 that the processing has been normally completed by the IC card 200.

When normal processing is performed in the IC card 200, the acquisition confirmation information 50 is generated in step S9. The acquisition confirmation information 50 includes, for example, a card ID, a paying entity identification, an update number at that time, and the like.

In step S10, for example, the individual information 10
With reference to the destination information arranged in the variable format of the descriptor in the descriptor format, the acquisition confirmation information 50 is transmitted to the transmitting device 1 using some uplink 60. In this case, I
The data can be transmitted after being encrypted with the encryption key of the C card 200.

The processing on the transmitting device 1 will be described again.

In step S 11, if the acquisition confirmation information 50 has been encrypted on the transmitting device 1 side, it is decrypted with the same encryption key as the receiving device 100.

In step S12, after confirming whether or not the decrypted acquisition confirmation information 50 is certainly transmitted from the predetermined receiving apparatus 100, the individual information 10 is already acquired. Of the receiving device 100 is determined.

In step S13, control is performed to reduce the frequency of transmitting the individual information 10 to the receiving apparatus 100 that has already acquired the individual information 10, or to terminate the transmission.

Transmission control is executed by the processing described above.

Further, the following processing may be added.

In a receiving apparatus 100 in which a communication path for transmitting information to the broadcast transmitting apparatus 1 is not always connected, for example, a receiving apparatus installed in a moving body such as a car, the communication path is connected to the receiving apparatus 100. Then, after transmitting the latest information stored in the receiving apparatus 100 and confirming it on the transmitting apparatus 1 side, a process of reducing or ending the frequency of repeated transmission to the receiving apparatus 100 thereafter Can be performed.

[0071]

As described above, according to the present invention,
On the receiving device side, it is determined whether the individual information received from the transmitting device is acquired and processed in the device, and if it is determined to be acquired, acquisition confirmation information is generated and transmitted to the transmitting device. On the device side, it is determined whether there is a receiving device that has already obtained the individual information by decoding the obtained acquisition confirmation information, and based on the determination result, the receiving device that has already obtained the individual information is determined. The transmission device side controls transmission of the individual information based on the acquisition confirmation information returned from the reception device, and thereafter suppresses transmission of the individual information to the reception device or terminates the transmission. By doing so, the number of receiving devices to which the individual information is transmitted can be reduced as needed, thereby reducing the number of times the individual information is repeatedly transmitted and suppressing the transmission amount of the entire individual information. . Therefore, it is possible to improve the utilization efficiency of the transmission path.

Also, according to the present invention, depending on the viewing mode of the receiver, only the persons who are not watching remain, so that if the same data transmission speed is used, the transmission cycle of the individual information to the remaining persons is reduced. It is possible to obtain an effect that the reception time becomes shorter and the reception becomes easier.

Further, according to the present invention, in the case where fixed reception such as terrestrial digital audio broadcasting and reception in a vehicle-mounted receiver are mixed, repeated transmission of information reliably received by fixed reception is terminated. This makes it possible to relatively increase the allocation of the transmission capacity for the in-vehicle receiving device, and to expect a further effect of easy reception.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of an individual information transmission system using acquisition confirmation information according to the present invention.

FIG. 2 is a flowchart illustrating a processing example of a transmission system.

FIG. 3 is a block diagram illustrating a configuration example of a conventional individual information transmission system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transmitting device 2 individual information generating unit 3 transmitting unit 4 totaling server 10 individual information 50 acquisition confirmation information 60 uplink 100 receiving device 101 receiving unit 102 acquisition determining unit 103 generating unit 104 confirmation information sending unit 200 IC card

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 7/081 F term (Reference) 5C063 AA01 AB03 AC01 AC10 DA03 DA07 DA13 5C064 BA01 BB02 BC06 BC17 BC18 BC22 BD03 BD05 BD08 BD09 CA14 CB08 5J104 AA16 EA04 EA22 NA02 NA35 NA37 NA41 PA05

Claims (5)

[Claims] 1. An individual information transmission system for transmitting individual information by conditional access broadcasting, comprising: an individual information transmitting means for repeatedly transmitting the individual information from a transmitting device to a plurality of receiving devices; A receiving unit that receives the individual information in each of the receiving devices; an acquisition determining unit that determines whether the received individual information is acquired in the receiving device and whether to process the individual information; Generating means for generating acquisition confirmation information indicating that the individual information has been acquired, and confirmation information sending means for sending the generated acquisition confirmation information from the receiving device to the transmitting device. Determining means for determining whether or not there is a receiving device that has acquired the individual information based on the transmitted acquisition confirmation information; and determining the individual information based on the determined result. Individual information transmission method is characterized in that comprises a transmission control means for controlling the repeated delivery to the receiving apparatus that has acquired the broadcast. 2. An IC card that can be attached to each of the receiving devices, wherein the generation unit performs an encryption process on the acquisition confirmation information using a key unique to the IC card, 2. The individual information transmission method according to claim 1, wherein the acquisition confirmation information is decrypted with a key corresponding to the encryption processing. 3. The receiving device is configured as a device in which a communication path for transmitting information to the transmitting device is not always connected, and is stored in the receiving device when the communication path is connected to the receiving device. The transmitting device, after decoding the transmitted latest information, reduces or ends the frequency of repeated transmission to the receiving device thereafter. Item 4. The individual information transmission method according to item 1 or 2. 4. The individual information transmission system according to claim 1, wherein the individual information transmission system includes the individual information transmission unit, the determination unit, and the transmission control unit. A transmitting device. 5. The individual information transmission system according to claim 1, wherein the reception unit, the acquisition determining unit, the generation unit, and the confirmation information are used in the individual information transmission system. A receiving device comprising transmitting means.