JP2010087554A - Broadcast wave reception system, portable communication terminal and receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast wave reception system capable of shortening the time until the completion of the acquisition of all data blocks configuring video contents without complicating the equipment of a broadcast station side. <P>SOLUTION: The broadcast wave reception system includes: the portable communication terminal 20 including a reception request means for requesting the reception of broadcast waves to the receiver 40, a content acquisition means for receiving the broadcast waves and acquiring the video contents, a reception error detection means for detecting the reception error of the data block, and a transfer request means for requesting the transfer of the video contents to the receiver 40 on the basis of the detected result of the reception error; and the receiver 40 including a reception control means for starting the reception of the broadcast waves on the basis of a reception request from the portable communication terminal 20, a data block holding means for holding the data block obtained by receiving the broadcast waves, and a data block transfer means for transferring the data block held in the holding means to the portable communication terminal 20 on the basis of a transfer request from the portable communication terminal 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a broadcast wave receiving system, a mobile communication terminal, and a receiving apparatus, and more specifically, a broadcast that receives a carousel-type broadcast wave including video content divided into two or more data blocks and acquires the video content. The present invention relates to a wave receiving system.

  In recent years, as a digital broadcast service for mobile terminals such as mobile phones, a mobile multimedia broadcast service that provides video content using a specific frequency band of the VHF band has been studied. The mobile multimedia broadcasting service is a new broadcasting service that uses a vacant frequency generated with the end of analog television broadcasting. Compared with the broadcasting service using one segment of the conventional UHF band, the mobile multimedia broadcasting service High quality audio can be streamed or downloaded.

  In this mobile multimedia broadcast service, as described above, two broadcast forms, stream type broadcast and download type broadcast, are assumed. Stream-type broadcasting is a broadcasting format in which data provided as content (program) is packetized and broadcast sequentially, and the broadcast wave receiving side can view content in real time in the same way as conventional one-segment broadcasting. . On the other hand, download-type broadcasting is a form in which content is divided into a plurality of data blocks (packets) and broadcast, and one system includes a broadcasting form in which a plurality of data blocks are repeatedly broadcast in a carousel system.

  The carousel method is a data transmission method that repeats transmission of a large number of data blocks constituting the content sequentially in a predetermined order at regular intervals. Content can be acquired reliably. That is, even when the reception of broadcast waves is started in the middle of the carousel cycle and a part or all of the content is missed in the cycle, these data blocks can be received in the next cycle. In addition, even if the reception state of the broadcast wave is bad and the data block cannot be received normally and the data block constituting the content is lost, the broadcast wave is not transmitted until the lost block is broadcast in the next cycle. By continuing reception, the missing block can be acquired.

  In general, when video content composed of moving images is downloaded and distributed, the amount of data to be transmitted is larger than when text and still images are downloaded and distributed, so the carousel cycle becomes longer. For this reason, if a data block that constitutes video content is lost, if reception of broadcast waves is continued and acquisition of the missing block is attempted, reception of all data blocks that make up the video content is completed. There was a problem that it took a long time.

Therefore, when a data block constituting the content is lost, the receiving terminal is caused to acquire the missing block from the broadcasting station via the communication network, so that the time until acquisition of all the data blocks constituting the content is completed. A technique for shortening has been proposed (for example, Patent Document 1). In the data broadcasting method described in Patent Document 1, when a receiving terminal requests a broadcast station to transfer a missing block via a communication network, the broadcasting station responds to the missing block based on a transfer request from the receiving terminal. The data block is transferred to the receiving terminal. However, in the method in which the broadcast station transfers the missing block based on the transfer request from the receiving terminal, it must be able to cope with the transfer request transmitted simultaneously from many receiving terminals in the broadcast area. There was a problem that the equipment on the station side became complicated and the manufacturing cost increased.
JP 2002-368707 A

  The present invention has been made in view of the above circumstances, and it is possible to shorten the time required to complete acquisition of all data blocks constituting video content without complicating the equipment on the broadcasting station side. It aims at providing a receiving system, a portable communication terminal, and a receiving device. In particular, it is an object of the present invention to provide a broadcast wave receiving system that can shorten the time until video content acquisition is completed when a reception error is detected in a plurality of data blocks constituting the video content.

  Another object of the present invention is to acquire desired video content while suppressing an increase in power consumption when it is difficult to receive broadcast waves due to the presence of interference waves in a specific frequency band. An object is to provide a broadcast wave receiving system that can be used.

  According to a first aspect of the present invention, there is provided a broadcast wave receiving system for receiving a broadcast wave of a carousel system including video content divided into two or more data blocks, receiving the broadcast wave, and communicating with the receiver. The present invention is applied to a broadcast wave receiving system composed of a mobile communication terminal to be performed. The mobile communication terminal includes: a reception request unit that requests the reception device to receive the broadcast wave; a content acquisition unit that receives the broadcast wave and acquires the video content specified in advance; A receiving error detecting means for detecting a receiving error of the data block; and a transfer requesting means for requesting the receiving apparatus to transfer the video content based on a detection result of the receiving error, wherein the receiving apparatus From a reception control means for starting reception of the broadcast wave based on a reception request from a communication terminal, a data block holding means for holding the data block obtained by receiving the broadcast wave, and a portable communication terminal Data block for transferring the data block held in the data block holding means to the portable communication terminal based on the transfer request of Constituted by a feeding means.

  In this broadcast wave receiving system, a broadcast wave receiving device starts receiving broadcast waves based on a reception request from a mobile communication terminal, and the data block held in the holding means is changed based on a video content transfer request. Transfer to mobile communication terminal. According to such a configuration, when a reception error of a data block is detected, the receiving device transfers the missing block, so that all the data blocks constituting the video content are made without complicating the equipment on the broadcasting station side. The time until the acquisition is completed can be shortened. In particular, if a reception device is requested to receive a broadcast wave when a transfer of a missing block is requested, the reception device can start receiving a broadcast wave when a data block reception error is detected. Therefore, since the second and subsequent missing blocks can be acquired in a time shorter than the carousel cycle, the time until acquisition of video content is completed when a reception error is detected in a plurality of data blocks constituting the video content. Can be shortened.

  In addition to the above-described configuration, the broadcast wave receiving system according to the second aspect of the present invention provides a broadcast wave reception when the mobile communication terminal exceeds a predetermined number of data blocks in which reception errors are detected during acquisition of the video content. Download control means for ending reception is provided, and the transfer request means is configured to request transfer of an unacquired block that was not acquired before the end of reception of the broadcast wave.

  In this broadcast wave receiving system, when the number of data blocks in which a reception error is detected exceeds a predetermined number in the mobile communication terminal, the reception of the broadcast wave is terminated and cannot be acquired not only by a missing block due to the reception error but also by the end of reception. The reception abandon block is also required to be transferred as an unacquired block. According to such a configuration, when it is difficult to receive a broadcast wave due to the presence of an interference wave in a specific frequency band, the reception of the broadcast wave can be promptly terminated, thereby suppressing an increase in power consumption. However, desired video content can be acquired.

  In addition to the above configuration, the broadcast wave receiving system according to a third aspect of the present invention includes a reception start instruction unit that instructs the content acquisition unit to start receiving a broadcast wave, and the reception request unit includes the above-described configuration. Based on an instruction to start reception, the receiver is configured to request reception of a broadcast wave. According to such a configuration, the receiving device is requested to receive the broadcast wave based on the instruction to start receiving the broadcast wave, and the receiving device starts receiving the broadcast wave. Therefore, the mobile communication terminal and the receiving device receive the broadcast wave. Can be started simultaneously. Therefore, it is possible to shorten the time until acquisition of all data blocks constituting the video content without complicating the equipment on the broadcasting station side.

  In addition to the above configuration, the broadcast wave receiving system according to the fourth aspect of the present invention is a broadcast extended by a reception error when the mobile communication terminal detects a data block reception error during acquisition of the video content. A reception extension time calculating means for calculating a wave reception extension time, wherein the transfer request means requests the receiving device to transfer video content when the reception extension time is equal to or greater than a predetermined threshold. Is done.

  According to such a configuration, since it is possible to request the receiving device to transfer the missing block in accordance with the extended reception time of the broadcast wave that is extended due to a reception error, the common receiving device transfers to a plurality of portable communication terminals. When transferring a missing block based on a request, it is possible to suppress traffic congestion.

  According to a fifth aspect of the present invention, there is provided a mobile communication terminal that receives a broadcast wave of a carousel system including video content divided into two or more data blocks, and receives the broadcast wave and communicates with the receiver. It is used in a broadcast wave receiving system composed of a mobile communication terminal. Specifically, a reception request unit that requests the reception device to receive the broadcast wave, a content acquisition unit that receives the broadcast wave and acquires the video content specified in advance, and a data block A reception error detection means for detecting a reception error, a transfer request means for requesting the reception device to transfer the video content based on the detection result of the reception error, and a reception error is detected during the acquisition of the video content. Download control means for terminating reception of broadcast waves when the number of data blocks exceeds a predetermined number, and the transfer request means requests transfer of unacquired blocks that were not acquired before the end of reception of broadcast waves. Configured to do.

  According to a sixth aspect of the present invention, there is provided a mobile communication terminal that receives a broadcast wave of a carousel system including video content divided into two or more data blocks, and receives the broadcast wave and communicates with the receiver. It is used for a broadcast wave receiving system comprising a mobile communication terminal. Specifically, a reception request unit that requests the reception device to receive the broadcast wave, a content acquisition unit that receives the broadcast wave and acquires the video content specified in advance, and a data block A reception error detection means for detecting a reception error, a transfer request means for requesting the reception device to transfer the video content based on the detection result of the reception error, and an instruction to start receiving a broadcast wave to the content acquisition means Receiving start instruction means, and the reception request means is configured to request the receiving apparatus to receive a broadcast wave based on the reception start instruction.

  According to a seventh aspect of the present invention, there is provided a mobile communication terminal for receiving a broadcast wave of a carousel system including video content divided into two or more data blocks, and receiving the broadcast wave and communicating with the receiver. It is used in a broadcast wave receiving system composed of a mobile communication terminal. Specifically, a reception request unit that requests the reception device to receive the broadcast wave, a content acquisition unit that receives the broadcast wave and acquires the video content specified in advance, and a data block A receiving error detecting means for detecting a receiving error; a transfer requesting means for requesting the receiving device to transfer the video content based on a detection result of the receiving error; and a data block receiving error during acquisition of the video content. And a reception extension time calculation means for calculating the reception extension time of the broadcast wave extended by the reception error when the reception request time is equal to or greater than a predetermined threshold. In addition, the receiving apparatus is configured to request transfer of video content.

  According to an eighth aspect of the present invention, there is provided a receiving device for receiving a carousel broadcast wave including video content divided into two or more data blocks, and a portable device for receiving the broadcast wave and communicating with the receiving device. A broadcast wave reception system comprising a communication terminal, wherein the mobile communication terminal receives the broadcast wave from a reception request means for requesting the reception device to receive the broadcast wave, Content acquisition means for acquiring video content, reception error detection means for detecting a reception error of the data block, and transfer request means for requesting the receiving device to transfer the video content based on the detection result of the reception error Are used in a broadcast wave receiving system. Specifically, based on a reception request from the mobile communication terminal, reception control means for starting reception of the broadcast wave, and data block holding means for holding the data block obtained by receiving the broadcast wave And data block transfer means for transferring the data block held in the data block holding means to the mobile communication terminal based on a transfer request from the mobile communication terminal.

  According to the broadcast wave receiving system, the mobile communication terminal and the receiving device according to the present invention, when a reception error of a data block is detected, the missing block is transferred to the mobile communication terminal and the receiving device. Without complicating, it is possible to reduce the time until all data blocks constituting the video content are acquired. In particular, by requesting the receiving device to receive a broadcast wave when requesting transfer of a missing block, it is possible to cause the receiving device to start receiving a broadcast wave when a data block reception error is detected. Therefore, since the second and subsequent missing blocks can be acquired in a time shorter than the carousel cycle, the time until acquisition of video content is completed when a reception error is detected in a plurality of data blocks constituting the video content. Can be shortened.

  In addition, when it is difficult to receive a broadcast wave due to the presence of an interference wave in a specific frequency band, the reception of the broadcast wave can be promptly terminated, so that desired video content can be obtained without increasing power consumption. Can be obtained.

Embodiment 1 FIG.
FIG. 1 is a system diagram showing an example of a schematic configuration of a broadcast wave receiving system according to Embodiment 1 of the present invention. The broadcast wave receiving system 100 is a digital broadcast receiving system that provides video content using a frequency band of the VHF band. The broadcast wave receiving system 100 includes a receiving device 40 that receives broadcast waves, and a receiving device 40 that receives broadcast waves. It comprises a mobile communication terminal 20 that performs communication.

  The broadcast station 10 is a transmission device managed by a broadcaster that provides a digital broadcast service, and broadcast waves in a pre-assigned frequency band (broadcast channel) are transmitted from a radio tower 11 installed on the ground. Here, it is assumed that video content divided into a plurality of data blocks (DB) is repeatedly broadcast by the carousel method.

  The mobile communication terminal 20 is a communication terminal such as a mobile phone that receives broadcast waves from the broadcast station 10 to download (DL) video content and communicates with the receiving device 40. Communication with the receiving device 40 is performed via, for example, the base station 30, the mobile communication network 31 and the Internet 32.

  The receiving device 40 includes a stationary broadcast wave receiving antenna 41, receives a broadcast wave from the broadcast station 10, acquires a data block constituting the video content, and communicates with the mobile communication terminal 20. It is a communication device that performs and is connected to the Internet 32. As such a receiving device 40, a storage device having a large capacity, for example, an HDD is provided, so that a recording device for recording a TV program is suitable.

  2A and 2B are explanatory views schematically showing an example of a data carousel transmitted by the broadcasting station 10 of FIG. FIG. 2A shows video contents A1 and A2 divided into a plurality of data blocks B1, and FIG. 2B shows loop-shaped data composed of the data block B1 and the DL information block B2. A carousel C1 is shown.

  The video contents A1 and A2 are programs provided by broadcasters, and are divided in advance into a plurality of data blocks B1 having the same data size, for example. In this example, the video content A1 is divided into seven data blocks “DB1-1” to “DB1-7”, and the video content A2 is divided into four data blocks “DB2-1” to “DB2-4”. Has been.

  Each data block B1 is composed of additional information and a data body made up of image data, and content identification information such as a content ID and data block identification information such as a block number are added as additional information. ing.

  The data carousel C1 is data for one period when one or more video contents are repeatedly broadcast, and is configured by arranging the data block B1 constituting the video contents A1 and A2 and the DL information block B2 in the order of broadcasting. The

  The DL information block B2 is an information block (IB) including control information related to content download, and is configured by identification information of the data carousel C1, a data size of the data block B1, and content information. As content information, content identification information included in the data carousel C1, data size, and the like are added.

  By receiving and analyzing this DL information block B2, the transmission cycle (carousel cycle) of the video contents A1 and A2 in the data carousel C1 and the last data block in one carousel cycle for the video content to be downloaded Can be determined. Such DL information blocks B2 are arranged in the data carousel C1 at predetermined intervals. That is, the DL information block B2 is transmitted at a time interval shorter than the transmission cycle of the data block B1, that is, the carousel cycle. Here, it is arranged in front of each video content A1, A2.

  The data carousel C1 configured in this way is transmitted using a predetermined frequency band in the broadcast channel. That is, the data carousel C1 is transmitted using the broadcast channel assigned to the broadcast station 10. The frequency band used for transmission of the data carousel C1, its bandwidth, modulation method, and the like are determined in advance according to the data size of the data carousel to be transmitted and the contents included in the data carousel.

  Here, the order of data reproduction (reproduction order) is defined for each data block B1 constituting the video contents A1 and A2, and the reproduction order is determined by each data block when the data carousel C1 is broadcast. It is not always necessary to match the order of B1 (broadcast order). When the broadcast order of the data block B1 does not coincide with the playback order, the data block downloaded by receiving the broadcast wave is rearranged based on the additional information included in the data block, and thus in the correct order. Video content can be played back.

  FIG. 3 is a block diagram illustrating a configuration example of a main part of the broadcast wave receiving system 100 in FIG. 1, and illustrates an example of a functional configuration in the mobile communication terminal 20. The mobile communication terminal 20 includes a DL content information acquisition unit 21, a broadcast wave reception antenna 22, an amplifier 23, a demodulation unit 24, a DB writing unit 25, a DB storage unit 26, a reception error detection unit 27, a transfer request unit 28, a reception request. Unit 29, communication antenna 51, unacquired block writing unit 52, and DL control unit 53.

  The DL content information acquisition unit 21 performs an operation of acquiring DL content information specifying video content to be downloaded. The DL content information includes a broadcast channel, a frequency band used for data carousel transmission, a modulation scheme, content identification information, and the like. Such DL content information is acquired, for example, by displaying a broadcast program guide acquired by receiving a broadcast wave and selecting a specific content in the broadcast program guide. Or DL content information is acquired when a user inputs a broadcast channel and a frequency band.

  The broadcast wave receiving antenna 22 is a broadcast wave antenna that receives broadcast waves and generates reception signals. The broadcast wave reception signal is amplified by the amplifier 23, and the amplified signal is demodulated by the demodulation unit 24. Here, it is assumed that the data block B1 is obtained by demodulating a digital modulation signal modulated by a predetermined modulation method, for example, a QPSK (4-phase phase shift keying) method based on DL content information. In addition to the QPSK, 16QAM (Quadrature Amplitude Modulation), 64QAM, or the like may be used as a modulation method for the digital modulation signal.

  The DB writing unit 25 performs an operation of storing the data block B1 obtained by demodulating the digital modulation signal in the DB storage unit 26. Specifically, when a data block constituting the video content specified by the DL content information is acquired, an operation of writing in the DB storage unit 26 is performed. That is, the broadcast wave receiving antenna 22, the amplifier 23, the demodulation unit 24, and the DB writing unit 25 are content acquisition means for acquiring video content specified in advance by DL content information.

  The reception error detection unit 27 performs an operation of detecting a reception error of the data block B1 and outputting the detection result to the transfer request unit 28, the reception request unit 29, and the DL control unit 53. The reception error of the data block B1 is detected based on the demodulation result by the demodulator 24, for example.

  The transfer request unit 28 performs an operation of requesting the receiving device 40 to transfer the video content based on the detection result by the reception error detection unit 27. Specifically, the missing block information specifying the data block B1 corresponding to the missing block is transmitted to the receiving device 40 via the communication antenna 51 as a transfer request.

  The reception request unit 29 performs an operation for requesting the reception device 40 to receive a broadcast wave. Here, DL content information is transmitted to the reception device 40 via the communication antenna 51 as a reception request. Here, it is assumed that the reception request and the transfer request for the receiving device 40 are simultaneously performed, and the reception request and the transfer request are transmitted every time a reception error of the data block B1 is detected.

  The unacquired block writing unit 52 performs an operation of receiving the data block transferred from the receiving device 40 via the communication antenna 51 and writing the data block in the DB storage unit 26.

  The DL control unit 53 controls the amplifier 23 and the demodulating unit 24 based on the demodulation result by the demodulating unit 24. When the data block in which the reception error is detected during the acquisition of the video content exceeds a predetermined number N, the DL control unit 53 The operation to end the reception of the wave is performed. Specifically, for the video content specified by the DL content information, if the number of data blocks in which a reception error is detected exceeds a predetermined number N, the reception of the broadcast wave is immediately terminated to the amplifier 23 and the demodulator 24. The operation is performed. For example, the reception of the broadcast wave is terminated by stopping the operations of the amplifier 23 and the demodulator 24.

  In general, in a situation where it is difficult to receive a broadcast wave due to the presence of an interference wave in a specific frequency band, there is a high possibility that a data block cannot be normally received over a time longer than the carousel period. In such a case, it is unlikely that the missing block can be received even if the reception of the broadcast wave is continued until the missing block is broadcast next time. Therefore, when the number of missing blocks exceeds a predetermined number, battery consumption can be effectively suppressed by terminating the reception of broadcast waves.

  Here, it is assumed that reception of a broadcast wave is started based on a user operation. For the video content specified by the DL content information, when no reception error is detected in the data block to be acquired, an operation (normal operation) for terminating the reception of the broadcast wave based on the analysis result of the DL information block is performed. Done. Furthermore, even when the number of data blocks in which a reception error is detected is less than or equal to the predetermined number N, the operation of terminating the reception of the broadcast wave is performed at the same timing as in the normal operation, and reception is performed until the missing block is broadcast next Do not continue.

  Based on the detection result of the reception error, the transfer request unit 28 requests transfer of a data block that was not acquired before the end of the broadcast wave reception. That is, when the number of data blocks in which a reception error is detected during acquisition of video content is equal to or less than a predetermined number N, transfer of data blocks (missing blocks) that cannot be acquired due to the reception error is requested. On the other hand, when the number of data blocks in which a reception error is detected exceeds a predetermined number N, not only missing blocks but also data blocks (reception abandonment blocks) that cannot be acquired due to the end of broadcast wave reception are transferred. Required. That is, the unacquired block includes a missing block that cannot be obtained due to a reception error and a reception abandon block that cannot be obtained because the number of missing blocks exceeds a predetermined number.

  FIG. 4 is a block diagram illustrating a configuration example of a main part of the broadcast wave reception system 100 of FIG. 1, and illustrates an example of a functional configuration in the reception device 40. The receiving device 40 includes a broadcast wave receiving antenna 41, an amplifier 42, a demodulator 43, a DB writing unit 44, a DB storage unit 45, a network connection unit 46, a reception control unit 47, and a DB transfer unit 48.

  The broadcast wave receiving antenna 41 is a broadcast wave antenna that receives broadcast waves and generates reception signals. The broadcast wave reception signal is amplified by the amplifier 42, and the amplified signal is demodulated by the demodulation unit 43. The DB writing unit 44 performs an operation of storing the data block B1 obtained by demodulating the digital modulation signal in the DB storage unit 45.

  The network connection unit 46 is a communication cable connection unit, and is connected to the Internet 32 via the communication cable. The reception control unit 47 performs an operation of starting reception of broadcast waves based on a reception request from the mobile communication terminal 20 via the network connection unit 46. Specifically, based on the DL content information transferred from the mobile communication terminal 20, an operation for determining a broadcast channel and the like and starting reception by the amplifier 42 and the demodulation unit 43 is performed.

  Here, the reception of the broadcast wave is started based on the DL content information transferred as a reception request together with the transfer request from the mobile communication terminal 20. The broadcast wave reception is started, for example, by starting the operation of the amplifier 42 and the demodulator 43 and demodulating the digital modulation signal based on the DL content information.

  The DB transfer unit 48 performs an operation of transferring a data block held in the DB storage unit 45 to the mobile communication terminal 20 based on a transfer request from the mobile communication terminal 20.

  Steps S101 to S105 and S201 to S203 in FIG. 5 are sequence diagrams illustrating an example of operations in the broadcast wave receiving system 100 in FIG. First, the mobile communication terminal 20 starts receiving broadcast waves based on the start operation by the user (step S101), and the data blocks “DB1-1” to “DB1” that configure the video content specified by the DL content information. -6 "is received sequentially.

  If the mobile communication terminal 20 detects a reception error when receiving the data block “DB1-6” (step S102), the mobile communication terminal 20 generates a transfer request for requesting transfer of the data block “DB1-6” in which the reception error is detected. Then, the data is immediately transmitted to the receiving device 40 together with the reception request (step S103).

  When receiving the transfer request and the reception request from the mobile communication terminal 20, the receiving device 40 starts receiving a broadcast wave based on the DL content information (step S201).

  Next, when the mobile communication terminal 20 receives the last broadcast data block among the data blocks constituting the video content specified by the DL content information, the mobile communication terminal 20 ends the reception of the broadcast wave (step S104).

  On the other hand, when receiving the data block “DB1-6” designated as the missing block in the transfer request, the receiving device 40 transfers the data block to the mobile communication terminal 20 and ends the reception of the broadcast wave (step S202, S203).

  When the missing block “DB1-6” is transferred from the receiving device 40, the mobile communication terminal 20 writes the data block in the DB storage unit 26, and ends this process (step S105).

  According to the present embodiment, when a reception error of a data block is detected, the receiving device 40 is caused to transfer the missing block, so that all of the video content can be configured without complicating the equipment on the broadcasting station 10 side. It is possible to shorten the time until the data block is obtained. In particular, since the reception device 40 is requested to receive a broadcast wave when a missing block transfer request is made, when a data block reception error is detected, the reception device 40 can start receiving a broadcast wave. The second and subsequent missing blocks can be acquired in a time shorter than the carousel period. That is, for the second and subsequent missing blocks, the receiving device 40 starts receiving broadcast waves when a transfer request for the first missing block is requested, and holds the received data block. If there is a transfer request for a missing block, the corresponding missing block can be transferred immediately.

  In addition, when it is difficult to receive a broadcast wave due to the presence of an interference wave in a specific frequency band, it is possible to quickly terminate the reception of the broadcast wave, so that the desired video can be suppressed while suppressing an increase in power consumption. Content can be acquired.

Embodiment 2. FIG.
In the first embodiment, when a reception error of a data block is detected by requesting reception to the reception device 40 when a transfer of a missing block is requested, the reception device 40 starts receiving broadcast waves. An example was described. On the other hand, in the present embodiment, a case will be described in which reception device 40 starts reception of a broadcast wave in advance by requesting reception device 40 to receive the broadcast wave at the start of reception.

  FIG. 6 is a block diagram showing a configuration example of the mobile communication terminal 60 in the broadcast wave receiving system according to the second embodiment of the present invention. This mobile communication terminal 60 is different from the mobile communication terminal 20 of FIG. 3 in that a reception start instruction unit 61 is provided.

  The reception start instruction unit 61 performs an operation of instructing content acquisition means, that is, the amplifier 23 and the demodulation unit 24 to start reception of broadcast waves. Here, the start of reception is instructed based on the start operation by the user.

  The reception request unit 29 performs an operation of requesting the reception device 40 to receive a broadcast wave based on the reception start instruction from the reception start instruction unit 61.

  Steps S111 to S116 and S211 to S213 in FIG. 7 are sequence diagrams illustrating an example of an operation in the broadcast wave receiving system including the mobile communication terminal 60 in FIG. First, the mobile communication terminal 60 gives an instruction to start reception based on a user operation, and on the basis of the instruction to start reception, the mobile communication terminal 60 transfers DL content information to the reception device 40 as a reception request and starts receiving broadcast waves. (Steps S111 and S112). Then, the data blocks “DB1-1” to “DB1-6” constituting the video content specified by the DL content information are sequentially received.

  When receiving the DL content information transferred from the mobile communication terminal 60, the receiving device 40 starts receiving broadcast waves based on the DL content information (step S211).

  When the mobile communication terminal 60 detects a reception error when receiving the data block “DB1-6” (step S113), the mobile communication terminal 60 generates a transfer request for requesting transfer of the data block “DB1-6” in which the reception error is detected. Then, the data is immediately transmitted to the receiving device 40 (step S114).

  When receiving the transfer request from the mobile communication terminal 60, the receiving device 40 transfers the data block “DB1-6” designated as the missing block to the mobile communication terminal 60 (step S212).

  Next, when the missing block “DB1-6” is transferred from the receiving device 40, the mobile communication terminal 60 writes the data block in the DB storage unit 26 (step S115). When the mobile communication terminal 60 receives the data block broadcast last among the data blocks constituting the video content specified by the DL content information, the mobile communication terminal 60 ends the reception of the broadcast wave and ends this processing (step S116). ).

  When receiving the last broadcast data block among the data blocks constituting the video content specified by the DL content information, the receiving device 40 ends the reception of the broadcast wave (step S213).

  According to the present embodiment, the reception device 40 is requested to receive the broadcast wave based on the instruction to start receiving the broadcast wave, and the reception device 40 starts receiving the broadcast wave. Therefore, the mobile communication terminal 60 and the reception device 40 can simultaneously start receiving broadcast waves. Therefore, it is possible to shorten the time until acquisition of all data blocks constituting the video content without complicating the equipment on the broadcasting station 10 side.

Embodiment 3 FIG.
In the second embodiment, an example has been described in which reception of broadcast waves is terminated when the number of data blocks in which reception errors are detected during acquisition of video content exceeds a predetermined number N. On the other hand, in the present embodiment, a case will be described in which transfer of a missing block is requested according to the reception extension time of a broadcast wave that is extended due to a reception error.

  FIG. 8 is a block diagram showing a configuration example of the mobile communication terminal 70 in the broadcast wave receiving system according to the third embodiment of the present invention. This mobile communication terminal 70 is different from the mobile communication terminal 60 of FIG. 6 in that it includes a reception extension time calculation unit 71.

  The reception extension time calculation unit 71 performs an operation of calculating a reception extension time of a broadcast wave extended by the reception error when a data block reception error is detected during acquisition of video content. That is, for the video content specified by the DL content information, the time from the end of reception of the last data block within one carousel period until the next missing block is broadcast is calculated as the reception extension time.

  The reception extension time is calculated based on, for example, the analysis result of the DL information block B2 and additional information included in the last data block.

  The transfer request unit 28 performs an operation for requesting transfer of a missing block when the reception extension time calculated by the reception extension time calculation unit 71 is equal to or greater than a predetermined threshold Th. When the reception extension time is less than the threshold Th, the transfer of the missing block is not requested, and the reception of the broadcast wave is continued until the missing block is broadcast next after the reception of the last data block.

  According to the present embodiment, since it is possible to request the receiving device 40 to transfer a missing block in accordance with the extended reception time of a broadcast wave that is extended due to a reception error, the receiving device common to a plurality of mobile communication terminals 70 When 40 transfers a missing block based on a transfer request, it is possible to suppress traffic congestion.

  In the first to third embodiments, an example in which video content is transmitted using one frequency band has been described, but the present invention is not limited to this. For example, the present invention can also be applied to a transmission method in which data blocks constituting one video content are distributed over two or more data carousels and these data carousels are transmitted simultaneously using different frequency bands. .

  In the first to third embodiments, an example in which a recording device to which a stationary broadcast wave receiving antenna 41 is connected is used as the receiving device 40. However, the present invention is not limited to this. Absent. For example, a mobile phone may be used as the receiving device 40. That is, one of the two mobile terminals is a system in which one mobile terminal requests the other mobile terminal to transfer the missing block, and the other mobile terminal transfers the corresponding data block to one mobile terminal. Also good.

  In the first to third embodiments, an example in which communication between the mobile communication terminal and the receiving device is performed via the base station 30, the mobile communication network 31, and the Internet 32 has been described. It is not limited to. The communication between the mobile communication terminal and the receiving device may be short-range wireless communication performed without going through a base station or a communication network, for example, infrared communication.

  Moreover, although Embodiment 1-3 demonstrated the example when reception of a broadcast wave is started based on the start operation by a user, this invention is not limited to this. For example, in the case of a mobile communication terminal or the like that can make a download reservation, the present invention can also be applied to a device that automatically starts receiving a broadcast wave when a predetermined time is reached. it can.

  In the first to third embodiments, the example in which the video content is acquired by receiving the broadcast wave has been described, but the present invention is not limited to this. The present invention can also be applied to content that acquires music content, game content, book content, etc. as downloaded content.

1 is a system diagram showing an example of a schematic configuration of a broadcast wave receiving system according to Embodiment 1 of the present invention. It is explanatory drawing which showed typically an example of the data carousel transmitted by the broadcasting station 10 of FIG. FIG. 2 is a block diagram illustrating a configuration example in a main part of the broadcast wave receiving system 100 in FIG. 1, and illustrates an example of a functional configuration in the mobile communication terminal 20. FIG. 2 is a block diagram illustrating a configuration example of a main part of the broadcast wave reception system 100 in FIG. 1, in which an example of a functional configuration in the reception device 40 is illustrated. It is the sequence diagram which showed an example of the operation | movement in the broadcast wave receiving system 100 of FIG. It is the block diagram which showed one structural example of the portable communication terminal 60 in the broadcast wave receiving system by Embodiment 2 of this invention. It is the sequence diagram which showed an example of the operation | movement in the broadcast wave receiving system containing the mobile communication terminal 60 of FIG. It is the block diagram which showed the example of 1 structure of the mobile communication terminal 70 in the broadcast wave receiving system by Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Broadcast station 20 Portable communication terminal 21 DL content information acquisition part 22 Broadcast wave receiving antenna 23 Amplifier 24 Demodulation part 25 DB writing part 26 DB storage part 27 Reception error detection part 28 Transfer request part 29 Reception request part 30 Base station 31 Mobile body Communication network 32 Internet 40 Receiver 41 Broadcast wave receiving antenna 42 Amplifier 43 Demodulating unit 44 DB writing unit 45 DB storage unit 46 Network connection unit 47 Reception control unit 48 DB transfer unit 51 Communication antenna 52 Unacquired block writing unit 53 DL control Unit 60 mobile communication terminal 61 reception start instruction unit 70 mobile communication terminal 71 reception extension time calculation unit 100 broadcast wave reception system A1, A2 video content B1 data block B2 DL information block C1 data carousel

Claims (8)

In a broadcast wave receiving system comprising a receiving device that receives a carousel broadcast wave including video content divided into two or more data blocks, and a mobile communication terminal that receives the broadcast wave and communicates with the receiving device ,
The mobile communication terminal includes a reception request unit that requests the reception device to receive the broadcast wave;
Content acquisition means for receiving the broadcast wave and acquiring the video content specified in advance;
A reception error detecting means for detecting a reception error of the data block;
Transfer request means for requesting the receiver to transfer the video content based on the detection result of the reception error,
The receiving device, based on a reception request from the mobile communication terminal, reception control means for starting reception of the broadcast wave,
Data block holding means for holding the data block obtained by receiving the broadcast wave;
A broadcast wave receiving system comprising: data block transfer means for transferring a data block held in the data block holding means to the mobile communication terminal based on a transfer request from the mobile communication terminal. The mobile communication terminal includes download control means for terminating reception of a broadcast wave when the number of data blocks in which reception errors are detected during acquisition of the video content exceeds a predetermined number,
2. The broadcast wave receiving system according to claim 1, wherein the transfer request means requests transfer of an unacquired block that was not acquired before the end of broadcast wave reception. The portable communication terminal includes a reception start instruction means for instructing the content acquisition means to start receiving a broadcast wave,
3. The broadcast wave receiving system according to claim 1, wherein the reception request unit requests the reception device to receive a broadcast wave based on the reception start instruction. The mobile communication terminal comprises a reception extension time calculation means for calculating a reception extension time of a broadcast wave extended by the reception error when a reception error of a data block is detected during the acquisition of the video content,
2. The broadcast wave receiving system according to claim 1, wherein the transfer request means requests the receiving device to transfer video content when the extended reception time is equal to or greater than a predetermined threshold. A broadcast wave receiving system comprising: a receiving device that receives a carousel broadcast wave including video content divided into two or more data blocks; and a mobile communication terminal that receives the broadcast wave and communicates with the receiving device. In the mobile communication terminal used,
Reception request means for requesting the reception device to receive the broadcast wave;
Content acquisition means for receiving the broadcast wave and acquiring the video content specified in advance;
A reception error detecting means for detecting a reception error of the data block;
Transfer request means for requesting the receiver to transfer the video content based on the detection result of the reception error;
Download control means for terminating the reception of broadcast waves when the number of data blocks in which a reception error is detected during acquisition of the video content exceeds a predetermined number;
The mobile communication terminal, wherein the transfer request means requests transfer of an unacquired block that has not been acquired before the end of broadcast wave reception. A broadcast wave receiving system comprising: a receiving device that receives a carousel broadcast wave including video content divided into two or more data blocks; and a mobile communication terminal that receives the broadcast wave and communicates with the receiving device. In the mobile communication terminal used,
Reception request means for requesting the reception device to receive the broadcast wave;
Content acquisition means for receiving the broadcast wave and acquiring the video content specified in advance;
A reception error detecting means for detecting a reception error of the data block;
Transfer request means for requesting the receiver to transfer the video content based on the detection result of the reception error;
Receiving start instruction means for instructing the content acquisition means to start receiving broadcast waves,
The mobile communication terminal, wherein the reception request means requests the reception device to receive a broadcast wave based on the reception start instruction. A broadcast wave receiving system comprising: a receiving device that receives a carousel broadcast wave including video content divided into two or more data blocks; and a mobile communication terminal that receives the broadcast wave and communicates with the receiving device. In the mobile communication terminal used,
Reception request means for requesting the reception device to receive the broadcast wave;
Content acquisition means for receiving the broadcast wave and acquiring the video content specified in advance;
A reception error detecting means for detecting a reception error of the data block;
Transfer request means for requesting the receiver to transfer the video content based on the detection result of the reception error;
A reception extension time calculating means for calculating a reception extension time of a broadcast wave extended by the reception error when a reception error of a data block is detected during the acquisition of the video content,
The mobile communication terminal, wherein the transfer request means requests the receiving device to transfer video content when the extended reception time is equal to or greater than a predetermined threshold. A broadcast wave receiving system comprising: a receiving device that receives a carousel broadcast wave including video content divided into two or more data blocks; and a mobile communication terminal that receives the broadcast wave and communicates with the receiving device. There,
The mobile communication terminal receives the broadcast wave from the receiving device, receives the broadcast wave, receives the broadcast wave, acquires the video content specified in advance, and the data block The receiving apparatus used in a broadcast wave receiving system comprising: a receiving error detecting means for detecting a receiving error of the receiving apparatus; and a transfer requesting means for requesting the receiving apparatus to transfer the video content based on a detection result of the receiving error. In
A reception control means for starting reception of the broadcast wave based on a reception request from the mobile communication terminal;
Data block holding means for holding the data block obtained by receiving the broadcast wave;
A receiving apparatus comprising: data block transfer means for transferring a data block held in the data block holding means to the mobile communication terminal based on a transfer request from the mobile communication terminal.

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