JP2007195041A - Broadcasting receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcasting receiver capable of reducing power consumption by adaptively changing receiving processing in accordance with a receiving environment based on positional information. <P>SOLUTION: The broadcasting receiver is provided with a reception processing part 10 for receiving and processing a broadcast wave; a receiving environment determining part 3 for acquiring the positional information of a receiving place and determining whether a receiving environment is a broadcast wave subject from a broadcasting satellite or a broadcast wave subject from a GF (gap filler) according to the positional information of the receiving place; and a reception control part 15a for controlling the reception processing of the reception processing part 10 according to the receiving environment determined by the receiving environment determining part 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a broadcast receiving apparatus applied to mobile satellite digital broadcasting.

  In mobile communication or broadcasting systems, a code division multiplexing (CDM) method using spread spectrum technology is used as one of transmission methods. One of the broadcasts using the CDM system is mobile satellite digital broadcast for mobiles.

  Since the carrier frequency used in mobile satellite digital broadcasting is very high, the radio wave travels straight, and there is an area where satellite waves cannot be received directly behind a shield such as an urban building. Therefore, a terrestrial re-transmission device called a gap filler (GF) is provided in such an area.

  However, the radio waves from the gap filler may reach a large number of receiving devices from various directions as reflected waves that are reflected and refracted many times by the wall of the building in addition to the direct wave from the GF. Such a radio wave environment is called a multipath environment. For stable reception in a multipath environment, a CDM receiver is provided with a RAKE receiver (see, for example, Patent Document 1).

  The RAKE receiving unit includes a plurality of processing units called fingers, separates a plurality of paths in a multipath environment, assigns them to each finger and receives them, and performs RAKE combining that combines these reception results. For this reason, the CDM receiving apparatus is provided with a matched filter, a reception signal correlation detection unit, and the like, and performs operations such as path position estimation and path assignment to fingers.

  On the other hand, in the country with a large area, at the beginning of broadcasting services, GFs are rarely installed outside urban areas, and it is highly possible to receive only direct waves from satellites. In this case, the number of paths assigned to the fingers of the RAKE receiving unit is about one or two, but since the reception level of radio waves from the satellite is low, the tuner unit of the CDM receiving apparatus needs to be provided with a low noise amplifier (LNA). There is. Alternatively, it is selected by a person such as attaching an antenna including an LNA and attaching / detaching it at the user's discretion.

  As the moving body moves, the reception environment of the receiving device for receiving mobile satellite digital broadcasts mounted on the moving body changes variously. Therefore, conventional mobile satellite digital broadcast receivers always have all of their functions maximized so that they can handle both multipath radio environments in the GF environment and environments that receive only direct waves from satellites. It is a full spec used for limited performance.

However, a full specification that can be used in various reception environments is an excessive specification depending on the reception environment. For example, in an environment where a direct wave from GF is received, the level of the received wave is high, so the LNA of the tuner unit has an excessive specification. On the other hand, in an environment where only direct waves from a satellite are received, there are almost no reflected waves, and providing a large number of fingers in the RAKE receiving unit is an excessive specification. A receiving device for receiving mobile satellite digital broadcasts, which has a full specification that can cope with such various receiving environments, increases power consumption.
JP 2002-94413 A

  The present invention provides a broadcast receiver capable of reducing power consumption by adaptively changing reception processing according to a reception environment based on position information.

  According to one aspect of the present invention, a broadcast receiving apparatus capable of receiving broadcast waves from a broadcast satellite and a gap filler, receiving a broadcast wave reception process unit, and acquiring current location information of a reception location, A reception environment determination unit that determines whether the reception environment is mainly a broadcast wave from a broadcast satellite or a broadcast wave from a gap filler according to the current position information, and a reception process according to the determined reception environment. There is provided a broadcast receiving apparatus including a reception control unit for controlling.

  ADVANTAGE OF THE INVENTION According to this invention, the broadcast receiver which can reduce power consumption can be provided by changing a receiving process adaptively according to the receiving environment based on a positional information.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the description of the drawings in the following embodiments, the same or similar parts are denoted by the same or similar reference numerals.

  Before describing the broadcast receiving apparatus according to the embodiment of the present invention, the configuration of a broadcast system to which the broadcast receiving apparatus is applied will be briefly described. The broadcast system shown in FIG. 1 includes a terrestrial broadcast station 101, a broadcast satellite 102, and a GF 103. The terrestrial broadcasting station 101 allocates and multiplexes packet data of broadcast contents to a plurality of channels to generate a broadcast signal, modulates the generated broadcast signal, converts the frequency into a high frequency (RF) band, and transmits the result. The broadcast satellite 102 relays the broadcast wave transmitted from the terrestrial broadcast station 101 and distributes it to a predetermined area. The GF 103 is installed in an area where satellite waves cannot be received directly. Therefore, the reception environment of the broadcast receiving apparatuses 1a and 100a changes according to the reception place.

  As shown in FIG. 2, the broadcast receiving device 1 a acquires a reception processing unit 10 that performs reception processing of a broadcast wave and current location information of a reception place, and the reception environment is from the broadcasting satellite 102 according to the current location information. The reception environment determination unit 3 for determining whether the broadcast wave (hereinafter referred to as “satellite wave”) or the broadcast wave from the GF 103 (hereinafter referred to as “GF wave”) is the main, and the reception environment determination unit 3 determines A reception control unit 15a that controls the reception processing of the reception processing unit 10 according to the received environment.

  By adaptively changing the reception process of the reception processing unit 10 according to the reception environment, the reception process of the full specification specification is not always executed, so that power consumption can be reduced.

  The reception processing unit 10 includes a diversity antenna unit 11, a tuner unit 12, a CDM demodulation unit 13, and an error correction (FEC) unit 14. The diversity antenna unit 11 receives broadcast waves using the two antennas 11a and 11b, and outputs the received broadcast signals from the antennas 11a and 11b. The tuner unit 12 detects the received signal. The CDM demodulation unit 13 includes a RAKE reception processing unit 131 that performs RAKE reception, and performs CDM demodulation on the reception signal detected by the tuner unit 12. The FEC unit 14 performs error correction on the demodulated received signal. Here, the diversity antenna unit 11, the tuner unit 12, and the CDM demodulation unit 13 have a configuration in which reception performance is adjusted by control data stored in advance in the control data storage unit 4b.

  As an example, as shown in FIG. 3, the tuner unit 12 includes LNAs 121a and 121b that amplify a received signal, a switching unit 122 that switches the number of antennas 11a and 11b used and the use / nonuse of the LNAs 121a and 121b according to control data. And an IQ quadrature detection unit 123 that detects the output signal of the switching unit 122. When both antennas 11 a and 11 b are used, diversity reception processing is performed by the switching unit 122. When the LNAs 121a and 121b are not used, the switching unit 122 does not input the output signals of the LNAs 121a and 121b, and the power supply to the LNAs 121a and 121b is stopped. The tuner unit 12 is configured to be able to switch the minimum reception sensitivity (for example, switching between −100 dB and −50 dB).

  Further, the CDM demodulator 13 switches the sampling clock frequency (for example, switching between 16 MHz and 32 MHz), switches the allowable reach of reflected waves, switches the number of matched filter stages, switches the number of path position detection protection stages, and assigns the number of fingers. The RAKE reception processing unit 131 performs RAKE processing on the assigned finger.

  Further, the reception environment determination unit 3 obtains current position information by receiving a GPS signal from, for example, the global positioning system (GPS) satellite 104 shown in FIG. 1, and the reception environment is either a satellite wave or a GF wave. It is determined whether it is. GPS is a satellite that obtains latitude, longitude, altitude, and time by performing triangulation on the ground using radio waves from 32 GPS satellites 104 that travel around 20,000 km on the ground in about 12 hours. It is a positioning system. For transmission of GPS signals, 1.575 GHz microwaves are used, while for broadcast waves, 2. A 6 GHz microwave (S band) is used.

  Since the current position can be determined by receiving the GPS signal, the current position can be checked against map information, and whether the current position is an urban area or a GF installation area can be used as an index for receiving environment determination. In this case, if the current position is an urban area or a GF installation area, it is determined that the reception environment is mainly a GF wave, and if the current position is not an urban area or a GF installation area, it is determined that the reception environment is mainly a satellite wave. The control data storage unit 4b stores two control data of satellite wave main control data and GF wave main control data in advance so as to be compatible with the two reception environments described above.

  In order to improve the accuracy of the reception environment determination, in the example illustrated in FIG. 2, the reception environment determination unit 3 determines the reception environment using the installation position information that associates the map information with the installation position of the GF 103. The installation position information is stored in advance in the installation position information storage unit 4a. Specifically, the reception environment determination unit 3 receives the GPS signal and outputs the current position information, and compares the current position information output from the GPS reception unit 32 with the installation position information. A broadcast wave determination unit 33 is provided that determines whether the reception environment is mainly a broadcast satellite wave or a GF wave depending on whether it is installed in the vicinity (for example, within a radius of 3 km). The broadcast wave determination unit 33 determines that the reception environment is mainly composed of satellite waves when the GF103 is not installed in the vicinity, and determines that the reception environment is mainly based on GF waves when the GF103 is installed in the vicinity. The

  The reception control unit 15a selects one of the two control data stored in the control data storage unit 4b based on the determination result of the broadcast wave determination unit 33. That is, when it is determined that the reception environment is mainly for satellite waves, the control data for the reception environment mainly for satellite waves is selected, and when it is determined that the reception environment is mainly for GF waves, the control data for the reception environment mainly for GF waves is selected. Select control data. The control data selected by the reception control unit 15a is set in the diversity antenna unit 11, the tuner unit 12, and the CDM demodulation unit 13.

  Specifically, the control data includes the setting of the number of antennas used by the diversity antenna unit 11, the setting of the minimum reception level of the tuner unit 12, the setting of use / nonuse of the LNA 121a or 121b, and the arrival of the reflected wave of the CDM demodulating unit 13. This is used for setting the allowable distance, setting the sampling clock frequency, setting the number of matched filter stages, setting the number of path position protection stages, and setting the number of fingers used by the RAKE reception processing unit 131.

  In the control data for the reception environment mainly composed of satellite waves, the number of diversity antennas is 1, the minimum reception level is, for example, −100 dB so that a weak satellite wave can be received, and LNAs 121a and 121b are used. In addition, since it is assumed that the reception environment is basically free of reflected waves, the allowable reach distance of the reflected waves is set to be as small as about 3 km, the sampling frequency is set as low as 16 MHz to reduce the number of samples, and the matched filter The number of stages and the number of path position detection protection stages are reduced, and the number of fingers used by the RAKE reception processing unit 131 is reduced to about two.

  On the other hand, in the control data for the reception environment mainly composed of GF waves, in order to be able to receive a large number of reflected waves from the plurality of GFs 103, the number of diversity antennas is 2, the minimum reception level is, for example, −50 dB, and the LNA 121a. And 121b are not used. Also, assuming that the number of reflections of the reflected wave is multiple, the allowable reach distance of the reflected wave is set to about 10 km, the sampling frequency is set high as 32 MHz, the number of samples is increased, and the number of matched filter stages In addition, the number of path position detection protection stages is increased, and the number of fingers used by the RAKE reception processing unit 131 is set to a maximum of 12.

  In this way, adaptive reception processing corresponding to the reception environment is executed. The reception signal after the reception processing is transmitted as packet data to the decryption unit 6 and the decryption key acquisition unit 8 shown in FIG. The decryption key acquisition unit 8 acquires the decryption key multiplexed on the received signal and supplies the acquired decryption key to the decryption unit 6. The decryption unit 6 decrypts the encryption applied to the reception signal after the reception process, using the decryption key. The decoded received signal is transmitted to the decoder 7. The decoder 7 decodes information such as video, audio, and data of each broadcast content from the packet data. The video information is supplied to the display unit 91 of the notification unit 9 and the audio information is supplied to the audio output unit 92 of the notification unit 9. The display unit 91 performs various types of video processing on the video information and displays the video information as a video. The audio output unit 92 performs various audio processes on the audio information and then outputs the audio information as audio.

  Furthermore, the reception position determination unit 5 and the notification unit 9 have a function of notifying the user of a position suitable for receiving broadcast waves. Here, the “position suitable for reception” means a reception position where good reception quality can be maintained continuously for a certain period of time. For example, the surrounding area of the GF 103 can be a position suitable for reception. When the map information includes information such as topography, an area without a shield in the south-southeast direction where the broadcasting satellite 102 exists can be set as a position suitable for reception. Alternatively, position information suitable for broadcast wave reception may be registered in advance on the map information.

  Information on a position suitable for reception determined by the reception position determination unit 5 is converted into a predetermined format, transmitted to the display unit 91 and the audio output unit 92, and notified to the user as video or audio. As an example, as shown in FIG. 4, a video (text) such as “From the current position to ~ is a good reception zone. Download is possible” is displayed on the display unit 91. As a result, when the user downloads broadcast content from the download channel, the user can know a position suitable for downloading. Note that the display is not limited to the display of text as shown in FIG. 4, and a position suitable for reception may be displayed superimposed on the map.

  Next, an operation example of the broadcast receiving device 1a will be described with reference to the flowchart shown in FIG.

  In step S101, the GPS receiving unit 32 acquires current position information.

  In step S102, the broadcast wave determination unit 33 collates the current position information acquired in step S101 with the installation position information.

  In step S103, the broadcast wave determination unit 33 determines whether the reception environment is mainly a satellite wave or a GF wave depending on whether or not the GF 103 exists around the current position.

  In step S104, the reception control unit 15a reads the control data from the control data storage unit 4b according to the determination result of step S103, and sets the read control data in the reception processing unit 10.

  In step S105, the reception position determination unit 5 determines a position suitable for receiving a broadcast wave, using the current position information acquired in step S101.

  In step S106, the notification unit 9 notifies the user of a position where the broadcast wave can be stably received from the broadcast satellite 102 or the GF 103 according to the determination result of step S105.

  As described above in detail, according to the broadcast receiving device 1a according to the embodiment of the present invention, the reception environment is determined according to the current position, and the configuration of the reception processing unit 10 is automatically set to the reception performance suitable for the reception environment. Can be switched automatically. As a result, it is possible to prevent the reception performance from becoming an excessive specification with respect to the reception environment, and it is possible to reduce power consumption. Furthermore, since it is possible to notify the user of a position suitable for reception, the user can determine, for example, whether or not to download the broadcast content according to the notification content from the notification unit 9.

(First modification)
Broadcast receiving apparatuses 1b and 100b according to a first modification of the embodiment of the present invention are in a communication environment capable of bidirectional communication with the management server 105 of the management center 107 via the ground communication network 110 as shown in FIG. Used in. As the ground communication network 110, a wireless communication network such as a mobile phone network or a PHS network is assumed, but a wired communication network such as a telephone network or the Internet may be used. The management server 105 accepts the user registration of the purchaser of the broadcast receiving apparatus, and the management server 105 stores a registration information list such as a user name, a terminal ID, and a pay program purchase history. When the pay program purchase information is notified from the broadcast receiving apparatuses 1b and 100b, the management center 107 accesses the management server 105, collates the terminal ID, and when it is determined that the user is a registered user from the collation result. Then, it is registered in the management server 105 as a regular user of a pay program. Further, a decryption key for a regular user is registered in an IC card (not shown) and mailed to the registered user.

  As shown in FIG. 7, the broadcast receiving device 1 b includes the communication unit 22 for communicating with the terrestrial communication network 110 and the card I / F 23 for accessing the IC card. Different from the device 1a. The decryption key acquisition unit 24 acquires a decryption key from any one of the reception signal after reception processing, the communication unit 22, and the IC card under the control of the reception control unit 15b.

  As described above, the decryption key used for decrypting the encryption applied to the broadcast content is normally distributed using a broadcast wave. However, since the decryption key is required for each broadcast receiving apparatus, when the number of subscribers increases, the time required to distribute and acquire the decryption key increases. Therefore, when the number of subscribers exceeds a certain number, the decryption key is distributed to the broadcast receiving apparatuses 1b and 100b via the terrestrial communication network 110. Therefore, the reception control unit 15 b controls the decryption key acquisition unit 24 to acquire the decryption key from the terrestrial communication network 110 using the communication unit 22. As a result, an increase in decryption key distribution time due to an increase in subscribers can be suppressed.

  Also, in areas where broadcast waves cannot be received well and communication with the terrestrial communication network 110 is difficult, the decryption key cannot be distributed using the broadcast waves and the terrestrial communication network 110, so it is registered in the IC card. The decrypted key is used. Therefore, the reception position determination unit 5 determines that the current position is an area where neither the satellite wave nor the GF wave can be satisfactorily received, and the communication unit 22 determines that communication with the ground communication network 110 is impossible. When it is determined, the reception control unit 15b controls the decryption key acquisition unit 24 to acquire the decryption key from the IC card using the card I / F 23.

  As described above, according to the broadcast receiving apparatus 1b according to the first modification of the embodiment of the present invention, it is possible to shorten the time required for distributing and acquiring the decryption key when the subscriber is increased or the reception quality is deteriorated. Further, the decryption key can be distributed even in an area where the broadcast wave cannot be received well and communication with the terrestrial communication network 110 is difficult.

(Second modification)
The broadcast receiving apparatus according to the second modification of the embodiment of the present invention is used in a communication environment similar to that of the broadcast system shown in FIG. 6, but the case where the terrestrial broadcast station 101 and the management center 107 are unifiedly managed. Assumed. In this case, it is possible to provide broadcast content not only via the broadcast wave but also via the terrestrial communication network 110.

  As shown in FIG. 8, in the broadcast receiving device 1 c according to the second modification of the embodiment of the present invention, the communication unit 22 receives broadcast content from the terrestrial communication network 110, and the received broadcast content is sent to the decoding unit 6. It differs from the broadcast receiving device 1b shown in FIG. In addition, the broadcast receiving device 1 c includes a broadcast content storage unit 80 that stores broadcast waves or broadcast content downloaded from the terrestrial communication network 110.

  The reception control unit 15c causes the communication unit 22 to restart the download of the broadcast content when the download cannot be continued during the download of the broadcast content transmitted by the broadcast wave. Specifically, when download by broadcast waves becomes impossible, it is confirmed whether the broadcast content to be downloaded is stored in the management center 107, and the management center 107 has been authenticated as an authorized user. In this case, download can be resumed. The cipher used for downloading via the terrestrial communication network 110 may be the same as or different from the cipher used for the broadcast wave.

  In addition, when the download for the broadcast wave has already been charged, the management center 107 (management server 105) does not charge for the download when the download by the terrestrial communication network 110 is resumed. It is preferable to charge only.

  The determination as to whether the download cannot be continued is made based on the determination result of the reception position determination unit 5 or the signal quality of the received signal. When the determination result of the reception position determination unit 5 is used, if the reception position determination unit 5 determines that the current position is an area where neither the satellite wave nor the GF wave can be satisfactorily received, the reception control unit 15c Is determined to be unable to continue downloading. When the signal quality of the received signal is used, a bit error rate (BER) calculated by the FEC unit 14 can be used as a measure of the signal quality. In addition, not only BER but carrier-to-noise ratio (C / N ratio) etc. may be used as a measure of signal quality.

  Next, a download operation example in the broadcast receiving device 1c will be described with reference to a flowchart shown in FIG.

  In step S201, the reception control unit 15c uses the reception processing unit 10 to download broadcast content.

  In step S202, the reception control unit 15c determines whether the download has been completed. If it is determined that the download is complete, the download operation ends. If it is determined that the download has not been completed, the process proceeds to step S203.

  In step S203, the reception control unit 15c determines whether or not the reception environment has deteriorated based on the determination result of the reception position determination unit 5, the BER calculated by the FEC unit 14, or the like. If it is determined that the download environment cannot be continued because the reception environment has deteriorated, the process proceeds to step S204. If it is determined that the reception environment has not deteriorated, the process returns to step S201 and the download is continued.

  In step S204, the reception control unit 15c determines whether or not the same broadcast content as the broadcast content downloaded in step S201 can be downloaded from the terrestrial communication network 110. Specifically, the reception control unit 15c accesses the management server 105 using the communication unit 22, and after authenticating that the user is an authorized user, inquires of the management server 105 whether there is broadcast content to be downloaded. It is determined whether the download can be resumed. When it is determined that the download can be resumed, the process proceeds to step S205. When it is determined that the download cannot be resumed, the process proceeds to step S206. In step S206, the user is notified by video or audio that the download cannot be continued, and the download operation ends.

  In step S205, the reception control unit 15c restarts the download, and executes the download operation until it is determined in step S207 that the download is complete. If it is determined in step S207 that the download has ended, the download operation ends.

  As described above, according to the broadcast receiving device 1c according to the second modification of the embodiment of the present invention, even if the download by the broadcast wave cannot be continued, the download can be resumed using the terrestrial communication network 110. It becomes possible.

(Other embodiments)
As mentioned above, although this invention was described by embodiment, it should not be understood that the description and drawing which form a part of this indication limit this invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the above description of the embodiment, it has been described that the installation position information is stored in advance in the installation position information storage unit 4a. However, since the installation state of the GF 103 usually changes, the broadcast wave, the terrestrial communication network 110, or It is desirable to update the installation position information as appropriate using an IC card or the like.

  Moreover, although the number of antennas of the diversity antenna unit 11 is two, a configuration including three or more antennas may be used in order to improve the diversity effect. As a result, the diversity effect is increased, and even when the radio wave propagation environment is poor due to shadowing or fading, it is possible to prevent a decrease in information transmission speed and an interruption in communication.

  Furthermore, although the structural example provided with the GPS receiving part 32 which acquires present position information was demonstrated, the acquisition method of present position information is not restricted to this example. For example, the current position information may be input from the GPS receiver of the car navigation device using a car navigation device with a GPS reception function. Further, when the user carries a mobile phone with a GPS reception function, the user may input the current position information obtained by the mobile phone via an MMI (Man Machine Interface). .

  Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters in the scope of claims reasonable from this disclosure.

It is a block diagram which shows the structural example of the broadcast system which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the broadcast receiver which concerns on embodiment of this invention. It is a block diagram which shows the internal structural example of the tuner part which concerns on embodiment of this invention. It is a schematic diagram which shows an example of the image (text) displayed on the display part which concerns on embodiment of this invention. It is a flowchart which shows the operation example of the broadcast receiving apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the broadcast system which concerns on the 1st modification of embodiment of this invention. It is a block diagram which shows the structural example of the broadcast receiving apparatus which concerns on the 1st modification of embodiment of this invention. It is a block diagram which shows the structural example of the broadcast receiver which concerns on the 2nd modification of embodiment of this invention. It is a flowchart which shows the operation example of the broadcast receiver which concerns on the 2nd modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a-1c, 100a, 100b ... Broadcast receiving apparatus 3 ... Reception environment determination part 4b ... Control data memory | storage part 5 ... Reception position determination part 6 ... Decryption part 8, 24 ... Decryption key acquisition part 9 ... Notification part 10 ... Reception process Units 15a to 15c ... Reception control unit 22 ... Communication unit 102 ... Broadcasting satellite 103 ... Gap filler (GF)
110: Terrestrial communication network

Claims (5)

A broadcast receiver capable of receiving broadcast waves from a broadcast satellite and a gap filler,
A reception processing unit for receiving and processing the broadcast wave;
A reception environment determination unit that acquires current position information of a reception location and determines whether a reception environment is mainly a broadcast wave from the broadcast satellite or a broadcast wave from the gap filler according to the current position information. When,
A broadcast receiving apparatus comprising: a reception control unit that controls the reception process according to the determined reception environment. An installation position information storage unit that stores installation information related to map information and the installation position of the gap filler;
A reception position determination unit that compares the current position information with the installation position information and determines a position suitable for receiving broadcast waves from the broadcast satellite or the gap filler;
The broadcast receiving apparatus according to claim 1, further comprising: a notification unit that notifies a user of a position suitable for reception. A decryption unit for decrypting the encryption applied to the received signal after the reception process;
A communication unit that performs wireless communication with the ground communication network;
A card interface for accessing the IC card;
A decryption key obtaining unit for obtaining a decryption key used for decryption of the encryption from any one of the reception signal after the reception process, the ground communication network, and the IC card. The broadcast receiving apparatus according to claim 1 or 2. A communication unit for communicating with the ground communication network;
The reception control unit causes the communication unit to restart the download of the broadcast content when the download cannot be continued during the download of the broadcast content transmitted by the broadcast wave. Item 3. The broadcast receiving device according to Item 1 or 2. The broadcast receiving apparatus according to claim 4, wherein the reception control unit determines whether the download cannot be continued according to the current position information.

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