JP2005167298A - Receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To download a program for receiving terminal used in a satellite broadcast system, a satellite communication system, a terrestrial broadcast system, or a terrestrial communication system into a receiving device. <P>SOLUTION: This receiving device is configured so as to be provided with a receiving section for receiving data of a radio wave signal transmitted from a transmitting station, a reception quality confirming section for confirming the reception quality of the data, on the basis of the data received by the receiving section, a program storage section configured so that the program for reception terminal can be stored therein, and a download program processing section for downloading the program for reception terminal from the transmitting station and installing the program into the program storage section. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a receiver used in a satellite broadcast system, a satellite communication system, a terrestrial broadcast system, a terrestrial communication system, or the like.

  FIG. 4 is a schematic block diagram showing a configuration of a receiving apparatus used in a satellite broadcast system, a satellite communication system, a terrestrial broadcast system, a terrestrial communication system, and the like.

  For example, a radio wave signal from a satellite received by the antenna 21 is converted into an electric signal having a predetermined frequency by the tuner 22, and then subjected to CDM demodulation and error correction by the CDM demodulation and FEC unit 23, and then to the encryption / decryption unit 24. Is output.

  The encryption / decryption unit 24 decrypts the received encrypted data using a decryption key or the like, and outputs it to the decoder unit 25 if it is audio information or video information, and outputs it to the data broadcast unit 26 if it is data information.

  The decoder unit 25 reproduces the received audio information or video information, while the data broadcasting unit 26 sends the received data information to the display unit.

A program for reproducing or displaying data is stored in the decoder unit 25 and the data broadcasting unit 26 in advance. It is convenient if these programs can be updated by a program downloaded from a satellite, for example, or can be replaced by a program downloaded from a satellite or the like.
JP 2002-333882 A JP-A-11-102287 JP 2002-281081 A

  However, conventionally, for example, downloading of a program using a downlink from a satellite has not been performed. That is, no program has been downloaded using the mobile environment.

  The present invention has been made in view of the above problems, and an object thereof is to provide a receiving apparatus capable of downloading a program for a receiving terminal used in a satellite broadcasting system, a satellite communication system, a terrestrial broadcasting system, or a terrestrial communication system. There is.

  The receiving device of the present invention includes a receiving unit that receives data based on a radio signal transmitted from the transmitting station side, a reception quality confirmation unit that confirms data reception quality based on the data received by the receiving unit, and a reception A program storage unit configured to be able to store a terminal program and, if the data reception quality has reached a predetermined standard, downloads the reception terminal program from the transmitting station and installs it in the program storage unit And a download program processing unit.

  The receiving device of the present invention includes a receiving unit that receives data from a radio signal transmitted from the transmitting station side, a program storage unit configured to be able to store a receiving terminal program, and a receiving terminal program stored on the transmitting station side A download program processing unit that is downloaded from and installed in the program storage unit, the receiving terminal program transmitted from the transmitting station side includes a test program, and the download program processing unit After confirming that the test program in the receiving terminal program operates properly, the receiving terminal program is installed.

  The download program processing unit includes detection means for detecting a data error in the downloaded reception terminal program, and authentication means for authenticating the validity of the downloaded reception terminal program. After it is determined that there is no error by the inspection means and the downloaded receiving terminal program is authenticated by the authentication means, the receiving terminal program is installed.

  According to the present invention, since the program is downloaded after confirming the reception quality and confirming that there are no or few data errors, the download program can be received with the data error rate as small as possible.

  FIG. 1 is a block diagram showing a configuration of a receiving apparatus as an embodiment of the present invention.

  This receiving apparatus 10 is used for a satellite broadcast system, a satellite communication system, a terrestrial broadcast system, a terrestrial communication system, or the like. Hereinafter, a case where this receiving apparatus is applied to a satellite broadcasting system will be described as an example.

  The tuner 12 converts a radio signal received from the antenna 11 from, for example, a satellite or a gap filler (GF) into an electric signal having a predetermined frequency and outputs the electric signal.

  A CDDM (Code Division Multiplex) demodulation and FEC (Forward Error Correction) unit 13 performs CDM demodulation and error correction on the electrical signal received from the tuner 12 and outputs the result.

  The encryption / decryption unit 14 decrypts the data output from the CDM demodulation and FEC unit 13 using a decryption key or the like. The encryption / decryption unit 14 outputs the decoded data to the decoder unit 15 when the data is audio information or video information, and outputs the data information to the data broadcasting unit 16 when the data is character data or the like. If the decrypted data is an installation download program, the encryption / decryption unit 14 outputs the decrypted data to the download program confirmation unit 18.

  The decoder unit 15 has a program for reproducing audio information and video information, and reproduces the audio information or video information received from the encryption / decryption unit 14 by executing the program.

  The data broadcasting unit 16 has a program for displaying data information, and by executing this program, the data information received from the encryption / decryption unit 14 is sent to the display unit (not shown).

  The download program confirmation unit 18 receives the decrypted data from the encryption / decryption unit 14 and performs error correction processing, authentication processing, and confirmation processing by a test program, which will be described later, in this order on the received decrypted data. When all of these processes are normally completed, the download program confirmation unit 18 outputs the download program and the first installation permission data to the download program installation unit 19.

  The reception quality confirmation unit 17 receives various parameters (for example, AGC, AFC, number of fingers) related to CDM demodulation, various data (for example, bit error rate (BER)) related to error correction, and the like from the CDM demodulation and FEC unit 13. The reception quality is determined based on the received parameters and data. The reception quality confirmation unit 17 outputs the second installation permission data to the download program installation unit 19 when the reception quality satisfies a predetermined standard, for example, after confirming a good reception state with few errors and reception quality. .

  When the download program installation unit 19 receives the first and second installation permission data from the download program confirmation unit 18 and the reception quality confirmation unit 17, respectively, the download program installation unit 19 converts the download program received from the download program confirmation unit 18 into the decoder unit 15. Or it installs in the data broadcasting part 16 or both of these. The program to be installed is, for example, an update program (for example, a version upgrade program) of a program already stored in the decoder unit 15 or the data broadcasting unit 16 or a replacement program. On the other hand, if the download program installation unit 19 does not receive the second installation permission data from the reception quality confirmation unit 17, for example, the download program confirmation unit 18 causes the download program confirmation unit 18 to stop downloading the program.

  Here, the second installation permission data may be input from the MMI 20 to the download program installation unit 19 instead of from the reception quality confirmation unit 17. That is, when the user acquires the reception quality from the reception quality confirmation unit 17 via the MMI 20 and determines that the reception quality is improved, the second installation permission data is input to the download program installation unit 19 using the MMI 20. May be.

  The MMI (Man Machine Interface) 20 includes an operation unit for giving various instructions to the receiving apparatus 10 from the outside, an interface for inserting a card storing data such as a program, and the like. The user can read out the version of the currently installed program, for example, by sending an instruction from the operation unit.

  Here, the error correction process, the authentication process, and the confirmation process performed by the test program executed by the download program confirmation unit 18 will be described in more detail.

  First, error correction processing will be described.

  The transmission side divides one download program to be transmitted to the reception device 10 into, for example, a plurality of blocks, and sends out the parity and serial number for error detection to each block. The download program confirmation unit 18 confirms the error detection parity added to each block for each received block, thereby detecting the presence or absence of an error for each block. If there is an error block, the next download is performed. Receive the program. This will be explained in more detail as follows.

  2A to 2D are conceptual diagrams illustrating error correction processing.

  As shown in FIG. 2A, the download program is divided from the transmission side into blocks of serial numbers 1 to n (block 1 to block n), and each block is transmitted with error detection parity added. . The receiving side performs error detection based on the error detection parity for each block. Here, among the blocks 1 to n, the blocks 1 to i-1, the blocks i + 1 to j-1, and the blocks j + 1 to n are received without errors, but the errors are detected for the blocks i and j. To do.

  In this case, the download program confirmation unit 18 receives again the block i and the block j in the next download program. As shown in FIG. 2B, it is assumed that there is no error in the block i in this reception (second reception), but an error is detected in the block j.

  The download program confirmation unit 18 replaces the block i received the first time with the one received the second time, and receives the block j in the next download program for the block j. As shown in FIG. 2C, it is assumed that an error is detected in the received block j even in the current reception (third reception).

  In this case, as shown in FIG. 2D, the download program confirmation unit 18 receives the download program until receiving an error-free block j. If a normal block cannot be received even after receiving a predetermined number of times (k times), the program download process is stopped.

  In the example described above, the download program is divided into a plurality of blocks and transmitted. However, if the capacity of the download program is relatively small, the download program may be transmitted without being divided into blocks. In this case, error detection of the download program is performed as follows, for example.

  That is, the download program confirmation unit 18 downloads the same download program a plurality of times, and compares the downloaded programs with each other (file compare). If all the download programs are the same, it is determined that there is no error in this download program. On the other hand, if not all of the download programs are the same, the download program may be downloaded an odd number of times, and the program having the largest number of download programs with the same content may be selected as having no error (majority selection process).

  Next, the authentication process will be described.

  The authentication process is performed by embedding authentication data in the download program in advance and confirming the validity of the authentication data. That is, the authentication data is extracted from the download program after decrypting the encrypted data, and the validity of the authentication data is confirmed. Alternatively, the authentication data encrypted with an encryption key different from the encryption key for the download program is embedded in the download program, and the encrypted authentication data is extracted from the decrypted download program, and this encrypted authentication data Is decrypted with the corresponding decryption key, and the validity of this authentication data is confirmed. With this authentication process, it is possible to confirm whether the download program has been sent from the correct person, whether the download program has been tampered with, or the like. Such authentication processing can be realized by using, for example, a public key cryptosystem.

  Next, confirmation processing by a test program will be described.

  The confirmation process by this test program extracts the test program from the download program and confirms that the download program is valid (for example, it has not been tampered with or has no errors) by operating this test program normally. It is something to try. The confirmation processing by this test program can be regarded as reinforcing the error detection processing and authentication processing described above.

  More specifically, a partial test program is embedded in advance for each block sent from the transmission side. When constructing a download program from each block, the download program confirmation unit 18 collects partial test programs included in each block, constructs a test program, and includes this in the download program. The download program confirmation unit 18 executes this test program, and if the test program operates normally, it determines that the received download program is valid (for example, has not been tampered with). On the other hand, if the test program does not operate normally, it is determined that this download program is not valid, and the download of the program is stopped.

  Next, steps of program download processing by the receiving device 10 will be described with reference to FIG.

  FIG. 3 is a flowchart showing steps of program download processing by the receiving apparatus 10.

  First, the download program confirmation unit 18 receives the decrypted data from the encryption / decryption unit 14 and performs the above-described error correction process (step S11). If there is an error and no error-free data can be received even after a predetermined number of receptions (YES in step S11), the download is stopped (step S12).

  If the download program confirmation unit 18 has received a download program without an error by the error correction process (NO in step S11), the download program confirmation unit 18 performs the authentication process described above (step S13).

  If the download program confirmation unit 18 determines that the download program is illegal by the authentication process (NO in step S13), the download program confirmation unit 18 stops the download (step S12).

  On the other hand, if it is determined that the download program is valid (YES in step S13), then the download program confirmation unit 18 extracts a test program from the download program and determines whether the test program operates normally. Judgment is made (step S14).

  If the test program does not operate normally (NO in step S14), the download program confirmation unit 18 stops the download (step S12).

  On the other hand, when the test program operates normally (YES in step S14), the download program confirmation unit 18 sends the first installation permission data and the download program to the download program installation unit 19. If the download program installation unit 19 receives the second installation permission data from the reception quality confirmation unit 17, the download program installation unit downloads the previous download program (the program currently installed in the decoder unit 15 or the data broadcast unit 16). 19 is stored in step 19 (step S15).

  After saving the previous program, the download program installation unit 19 installs the newly downloaded program in the decoder unit 15 or the data broadcasting unit 16 (step S16).

  If the installation is not successful due to a hardware defect or the like (NO in step S17), for example, a download program can be installed via the MMI 20 (steps 20 and S21). That is, the storage card storing the download program is inserted into the MMI 20, and the download program installation unit 19 reads the download program from the storage card and installs it.

  On the other hand, after the installation of the download program is successful (YES in step S17), if the decoder unit 15 or the data broadcasting unit 16 detects a problem such as a bug during the execution of the download program (YES in step S18), that fact. Is displayed on a display unit (not shown), for example, and the previous program stored in step S15 is reinstalled in the decoder unit 15 or the data broadcasting unit 16 in accordance with an instruction from the user (step S19). The program having a bug is deleted, for example (step S19).

  As described above, according to the present embodiment, the reception quality is confirmed, and the program is downloaded when it is confirmed that there is no error or the data can be received in a small state. Download programs can be received as much as possible.

  Also, when installing a new download program, the currently installed download program is saved, so if a problem occurs with the new download program, the original download program must be reinstalled. A crisis can be avoided.

  Also, the download program was divided into multiple blocks on the transmission side, each block was encoded so that error detection could be performed on a block basis, and a serial number was added to each block. Even when correct data cannot be received, it is only necessary to re-receive the block, so that the program can be downloaded efficiently.

  Further, since the authentication of the download program is performed, it is possible to prevent the installation of the download program from an unauthorized person and the installation of the downloaded download program.

  In addition, the test program part is stored in each block part, the test program is generated from each block on the receiving side, and the operation of this test program is checked, so the validity of the download program is more reliable. Can be.

  In addition, since the download program can be installed from a medium such as a storage card, the program can be installed without bringing the mobile terminal to the service center even if the program is not downloaded properly from a satellite or the like. . At this time, since the MMI driver program is stored in the portable terminal in advance, the installation of the program from the MMI is guaranteed even in a situation where downloading of the program via the air is not guaranteed.

  Further, the user can check the version of the currently downloaded program by reading the version of the currently installed program from the MMI.

It is a block diagram which shows the structure of the receiver as embodiment of this invention. It is a conceptual diagram explaining an error correction process. It is a flowchart which shows the step of the program download process by a receiver. It is a block diagram which shows the structure of the conventional receiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Antenna 12 Tuner 13 CDM demodulation and FEC part 14 Encryption / decryption part 15 Decoder part 16 Data broadcasting part 17 Reception quality confirmation part 18 Download program confirmation part 19 Download program installation part 20 MMI

Claims (5)

A receiving unit for receiving data based on radio signals transmitted from the transmitting station;
A reception quality confirmation unit for confirming the reception quality of the data based on the data received by the reception unit;
A program storage unit configured to be able to store a program for a receiving terminal;
When the reception quality of the data has reached a predetermined standard, a download program processing unit that downloads the program for the receiving terminal from the transmitting station side and installs it in the program storage unit;
A receiving device. A receiving unit for receiving data based on radio signals transmitted from the transmitting station;
A program storage unit configured to be able to store a program for a receiving terminal;
A download program processing unit that downloads a program for a receiving terminal from the transmitting station side and installs it in the program storage unit, and
The receiving terminal program transmitted from the transmitting station side includes a test program, and the download program processing unit confirms that the test program in the downloaded receiving terminal program operates properly, A receiving device for installing a receiving terminal program.   The download program processing unit includes detection means for detecting a data error in the downloaded reception terminal program, and authentication means for authenticating the validity of the downloaded reception terminal program. 3. The receiving terminal program is installed after it is determined that there is no error by the inspection means and the downloaded receiving terminal program is authenticated by the authentication means. Receiver device.   The download program processing unit has storage means for storing a previous reception terminal program stored in the program storage unit before installing the reception terminal program, and the stored previous reception terminal program is stored in the download program processing unit. The receiving apparatus according to claim 1, wherein the receiving apparatus is configured to be re-installable as necessary.   The download program processing unit repeatedly downloads the receiving terminal program from the transmitting station side, compares each downloaded receiving terminal program, and installs any of these receiving terminal programs if all are the same The receiving apparatus according to any one of claims 1 to 4, wherein if there are receiving terminal programs having different contents, the receiving terminal program having the same content is installed most often.

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