JP4731214B2 - Portable terminal device, content distribution device, content distribution system, and communication program - Google Patents

Description

  The present invention uses a mobile terminal device such as a mobile phone, a PHS phone (PHS: Personal Handyphone System), a PDA device (PDA: Personal Digital Assistant) having a wireless communication function, a notebook personal computer device, etc. The present invention relates to a mobile terminal device, a content distribution device, a content distribution system, and a communication program that enable good reception of content on the mobile terminal device side even when communication quality deteriorates when performing a distribution service.

  2. Description of the Related Art Conventionally, services that distribute contents such as movies and music are known as one of services provided via a mobile phone. Today, it is desired to distribute content data with higher quality. In response to this demand, recently distributed content data has a larger amount of data.

  However, the mobile phone causes a deterioration in communication quality when the user moves to a place where the communication environment is bad, and when access from a large number of users concentrates on a single radio base station, Since the communication band allocated to is reduced, the communication quality is deteriorated. For this reason, even if the content data to be distributed is improved in quality, there is a problem that it is difficult to receive stable distribution of the high-quality content data.

  Here, Japanese Patent Application Laid-Open No. 2005-20312 (Patent Document 1) discloses a content distribution system that distributes content such that audio is not interrupted among content including audio and video.

  In the content distribution system, when a content distribution request is transmitted from the mobile device to the content server, the content server transmits the video data to the mobile device via the mobile packet communication network. Upon receiving the video data transmitted from the content server, the mobile device starts storing the video data and requests the content server to transmit audio data. When this audio data transmission request is made, the content server transmits the audio data to the mobile device via the circuit switching network.

  In other words, the content server transmits video data and audio data via different networks. As a result, even when the communication quality deteriorates in the mobile packet communication network used for video data transmission, the circuit switching network used for audio data transmission can obtain stable communication quality. On the side, only voice can be received with good communication quality.

Japanese Patent Laying-Open No. 2005-20312 (Page 5: FIGS. 1 and 4)

  However, in the case of the content distribution system disclosed in Patent Document 1, since video can be acquired only from a mobile packet communication network, there is a problem that only audio can be received when video cannot be received.

  Even when video data is normally received via the mobile packet communication network, it is necessary to keep the communication line between the mobile device and the circuit switching network established. That is, while receiving distribution of video and audio content data, audio is obtained with the communication line between the mobile device and the circuit switched network being established throughout. For this reason, there is a possibility that the communication fee increases.

  The present invention has been made in view of the above-described problems, and provides a mobile terminal device, a content distribution device, a content distribution system, and a communication program that can receive the entire content well and inexpensively even when communication quality deteriorates. With the goal.

The portable terminal device according to the present invention is a means for solving the above-described problems.
Circuit-switched network content data and packet-switched network content data having a higher quality than the circuit-switched network content data, delivering the circuit-switched network content data via the circuit-switched network, and packet switching When receiving any one of the content data from the content distribution device that distributes the content data for the packet switching network via the network, the content distribution device is connected to the content distribution device via the packet switching network or the circuit switching network. A communication line establishing means for establishing a communication line of
Communication quality detecting means for detecting the communication quality of the packet switching network;
When receiving the content data, the communication line establishment unit is controlled to establish a communication line with the content distribution apparatus via the packet switching network, and the communication quality detecting unit controls the packet switching network. The communication line establishment means is controlled to establish a communication line with the content distribution apparatus via the circuit switching network when the communication quality deterioration is detected, and the communication quality detection means Controls the communication line establishment means to disconnect the communication line established with the content distribution apparatus via the circuit switching network when the communication quality of the packet switching network is improved. Connected network control means,
The packet switching network content data received from the content distribution device via the circuit switching network or having a higher quality than the circuit switching content data via the packet switching network It receives, and a reception processing means for performing predetermined data processing corresponding to the content data.

In addition, the content distribution apparatus according to the present invention is a means for solving the above-described problems.
Communication line establishment means for establishing a communication line via a packet switching network and a communication line via a circuit switching network with a delivery target device that receives distribution of content data;
To distribute the content data blocks formed by dividing a series of content data through the circuit-switched network, with the same block numbers assigned to the content data blocks having the same data content. Circuit switched network content data, and a database storing packet switched network content data to be distributed through the packet switched network, which is of higher quality than the circuit switched network content data ,
By detecting a good communication quality of the packet switching network by the delivery target device, only the communication line through the packet switching network is established between the delivery line establishing unit and the delivery target device. The packet switched network content data stored in the database is distributed to the delivery target device via the packet switched network, and the delivery target device detects a deterioration in communication quality of the packet switched network. Thus, when a communication line through the packet switching network and a communication line through the circuit switching network are established with the delivery target device, the communication quality of the packet switching network by the delivery target device is established. above until improved is detected, the content data packet switching network which is stored in the database, via the packet switching network The circuit-switched network content data having the same block number as the packet-switched network content data distributed to the delivered device via the packet-switched network and the circuit-switched network content data Distribution means for delivering to the delivery target device.

In addition, the content distribution system according to the present invention is a means for solving the above-described problems.
Communication line establishment means for establishing a communication line via a packet switching network and a communication line via a circuit switching network with a delivery target device that receives distribution of content data;
A database storing packet-switching network content data for distribution via the packet-switching network and circuit-switching network content data for distribution via the circuit-switching network;
By detecting a good communication quality of the packet switching network by the delivery target device, only the communication line through the packet switching network is established between the delivery line establishing unit and the delivery target device. The packet switched network content data stored in the database is distributed to the delivery target device via the packet switched network, and the delivery target device detects a deterioration in communication quality of the packet switched network. Thus, when a communication line through the packet switching network and a communication line through the circuit switching network are established with the delivery target device, the communication quality of the packet switching network by the delivery target device is established. above until improved is detected, the content data packet switching network which is stored in the database, via the packet switching network With delivery to the distribution apparatus, the target delivery device the circuit switched network content data same block numbered and delivery packet switched network content data via the packet switching network, said circuit switching network A content distribution device comprising: distribution means for distributing to the distributed device via
Communication line establishment means for establishing a communication line with the content distribution apparatus via the packet switching network or the circuit switching network when receiving content data from the content distribution apparatus;
Communication quality detecting means for detecting the communication quality of the packet switching network;
When receiving the content data, the communication line establishment unit is controlled to establish a communication line with the content distribution apparatus via the packet switching network, and the communication quality detecting unit controls the packet switching network. The communication line establishment means is controlled to establish a communication line with the content distribution apparatus via the circuit switching network when the communication quality deterioration is detected, and the communication quality detection means Controls the communication line establishment means to disconnect the communication line established with the content distribution apparatus via the circuit switching network when the communication quality of the packet switching network is improved. Connected network control means,
A delivery target device comprising: reception processing means for receiving the content data delivered from the content delivery device via any of the networks and performing predetermined data processing corresponding to the content data.

The communication program according to the present invention includes circuit-switched network content data and packet-switched network content data having a higher quality than the circuit-switched network content data. A communication program for distributing content data for a network and receiving the content data from a content distribution device that distributes the content data for the packet switched network via a packet switched network. In order to solve the problem, the computer is caused to function as follows.

That is, the communication program according to the present invention is:
When receiving the content data, the computer functions as communication quality detection means for detecting communication quality of the communication line of the packet switching network established by the communication means,
When the content data is received, the communication means is controlled to establish a communication line with the content distribution apparatus via the packet switching network, and the computer is caused to function as the communication quality detection means. While the good communication quality of the packet switching network is detected, the communication means is controlled to receive the high-quality packet switching network content data via the packet switching network, and the computer controls the communication quality. If deterioration of the communication quality of the packet switched network in function as an detector means is detected, established to content data for said packet switching network the communication line between the content delivery apparatus via the line switching network controls the communication unit to receive content data for the circuit switched network instead of Computing Communication line established with the content distribution apparatus via the circuit-switched network when the communication quality of the packet-switched network is detected to be improved by functioning as a communication quality detecting means. And the computer functions as connection network control means for controlling the communication means so as to receive the high-quality packet switching network content data via the packet switching network .

According to the present invention, the content distribution apparatus includes the circuit-switched network content data and the packet-switched network content data having a higher quality than the circuit-switched network content data. The switching network content data is distributed, and the packet switching network content data is distributed through the packet switching network. When the communication quality through the packet switching network is good, the high quality packet switching network content data is received through the packet switching network, and the communication quality of the packet switching network deteriorates. The content data for the circuit switching network is received instead of the content data for the packet switching network through the switching network . Then, when the communication quality of the packet switching network is improved, the communication line via the circuit switching network is disconnected, and the network that distributes content data is returned to the packet switching network.

  Thereby, a series of content data can be continuously delivered without interruption. In addition, two communication lines (packet-switched network and circuit-switched network) are always held in parallel because switching to communication via the circuit-switched network is performed only while the communication quality through communication via the packet-switched network deteriorates. Inconveniences caused by such a situation can be prevented, and unnecessary communication costs due to the two communication lines being held in parallel at all times can be prevented.

  According to the present invention, even when the communication quality is deteriorated, the entire content can be received favorably and inexpensively.

  The present invention can be applied to a content distribution system that distributes predetermined content such as movies and music to mobile communication terminal devices such as mobile phones.

[System configuration]
FIG. 1 shows a block diagram of a content distribution system according to an embodiment to which the present invention is applied. As shown in FIG. 1, the content distribution system according to this embodiment is designed to connect a distribution apparatus 1 that performs distribution control of predetermined contents such as movies and music stored in a database to the network of the distribution apparatus 1. Network interface 2 (network IF), a communication network 3, a switch 4 connected to the communication network 3 together with the network IF 2, and a plurality of base stations that enable wireless communication between mobile phones 6 located in each region 5 and a mobile phone 6 having a wireless communication function.

[Configuration and operation of mobile phone]
FIG. 2 shows a block diagram of the mobile phone 6 used in this content distribution system. In FIG. 2, the reception system of the mobile phone 6 receives the reception signal from the base station 5 with the antenna 11 and supplies it to the reception demodulation unit 13 via the antenna duplexer 12. The reception demodulation unit 13 has an RF circuit, and performs demodulation processing such as necessary band limitation processing so that the reception signal supplied from the antenna duplexer 12 becomes an appropriate level by the RF circuit or the like. . The signal demodulated by the reception demodulator 13 is converted into a re-digital signal by A / D conversion and supplied to the reception data decoder 14.

  The reception data decoding unit 14 performs baseband signal processing and the like on the reception data demodulated by the reception demodulation unit 13, thereby decoding the final original reception data and supplying this to the control unit 15. To do. The control unit 15 is a microcomputer device having a CPU, RAM, ROM, EEPROM, etc., an input unit 16 such as a key or jog dial, a display unit 17 such as an LCD, a data storage unit 18 such as an internal memory or an external memory, an alarm In addition, it controls the speaker unit 19 for outputting voices, voices of music contents, etc., the incoming call notification unit 20 for notifying incoming calls of LEDs, ringers, and the like.

  Next, when transmitting a content transmission request message or a reception data confirmation message, which will be described later, in the transmission system of the mobile phone 6, the control unit 15 transmits the content transmission request message or the reception data confirmation message. Data is formed and supplied to the transmission data encoding unit 21. The transmission data encoding unit 21 encodes and compresses the transmission data using a predetermined encoding method, and supplies the transmission data to the transmission modulation unit 22. The transmission modulation unit 22 performs D / A conversion processing on the transmission data subjected to compression encoding processing to form an analog modulation signal and converts the analog modulation signal into a transmission signal having a desired transmission frequency. The transmission modulation unit 22 includes an RF circuit. The RF circuit amplifies the transmission signal converted into the desired frequency to a necessary transmission power, and the power amplified transmission signal is The data is transmitted to the base station 5 via the antenna duplexer 12 and the antenna 11.

Even if the power of the mobile phone 6 is turned off by the EEPROM provided in the control unit 15, the control unit 15 stores information such as the previous communication result, and the power is turned on next time. At this time, based on the information stored in the EEPROM, for example, a radio abnormality or a battery abnormality during distribution is dealt with.

[Content delivery operation]
[Basic system operation]
Next, FIG. 3 shows a basic sequence of the content distribution system of this embodiment. As shown in FIG. 3, in the case of this content distribution system, first, in step S1, a content transmission request by the user of the mobile phone 6 is transmitted to the distribution device 1. The distribution apparatus 1 that has received this content transmission request confirms the content identification number (content ID) in step S2, and starts content data transfer control. This content data transfer control is performed so that the content data is reliably distributed between the distribution device 1 and the mobile phone 6, and the distribution result information is stored when the distribution is interrupted. Is called. When the content data transfer control ends normally, the distribution apparatus 1 transmits a content transmission response to the mobile phone 6 in step S3, and ends the content data transfer control.

[System operation under normal conditions]
FIG. 4 is a sequence diagram showing in detail the “normal” system operation in this content distribution system. As shown in FIG. 4, when the communication control unit 30 of the mobile phone 6 transmits a stream transfer start request to the packet exchange call unit 32 of the distribution apparatus 1 in step S11, the time measurement by the retransmission control timer is performed in step S12. (Count) starts.

  When receiving the stream transfer start request, the packet exchange call unit 32 of the distribution apparatus 1 reads out the stream data to be transferred from the database in step S13, divides the entire stream data into content data blocks, Stream data is transmitted in block units.

  As shown in FIG. 5, the block structure of the content data includes a content ID 35, block number information 36 indicating the total number of blocks formed by division, CBSN information 37 indicating the playback order of each content data block, and content that is the data body. It consists of data 38 and parity information 39 for calculating the reliability of received data (parity check).

  Among these, the CBSN information is a sequence number assigned so that each content data block can be identified when the entire stream data to be transferred is divided into each content data block. This makes it possible to identify which content data block has been received and which content data block to be reproduced next.

  In addition, the parity information confirms whether or not each content data block has been correctly received by comparing the result of performing a predetermined calculation based on the received content data 38 and the parity information. Used for.

  In the case of the distribution system according to this embodiment, the stream data having the block structure described above includes “high bit rate stream data for packet-switched calls” such as 128 Kbps and 384 Kbps, and “circuit-switched calls such as 32 Kbps and 64 Kbps”. "Low bit rate stream data" for a total of two types of stream data.

  As will be described in detail below, when the communication state between the communication control unit 30 of the mobile phone 6 and the packet switching call unit 32 of the distribution device 1 is good, the distribution device 1 sends the above high When the bit rate stream data is transmitted to the mobile phone 6 side and the communication state between the communication control unit 30 of the mobile phone 6 and the packet exchange call unit 32 of the distribution device 1 deteriorates, the communication control of the mobile phone 6 is performed. A circuit-switched call is established between the unit 30 and the circuit-switched call unit 33 of the distribution apparatus 1, and the low bit rate stream data is transmitted to the mobile phone 6 via the circuit-switched call. .

  Also, the sequence number (= block number indicating the reproduction order of the block) assigned to each content data block formed by dividing the high bit rate stream data and the low bit rate stream data are divided. The sequence number assigned to each content data block formed in this way is assigned the same sequence number.

  In other words, the data content of, for example, the third content data block formed from the high bit rate stream data, the data content of the third content data block formed from the low bit rate stream data, The data contents are the same. Similarly, for example, the data content of the first content data block formed from the high bit rate stream data is the same as the data content of the first content data block formed from the low bit rate stream data. It is data contents.

  Next, in this example, since the communication state between the mobile phone 6 and the distribution apparatus 1 is good, the packet switching call unit 32 of the distribution apparatus 1 Each content data block is divided and transmitted to the mobile phone 6 in step S13 of the sequence diagram shown in FIG.

  Next, when the communication control unit 30 of the mobile phone 6 receives the content data block transmitted from the packet exchange call unit 32 of the distribution device 1, the communication control unit 30 controls to stop the count operation of the retransmission control timer in step S14. In S15, a parity check is performed based on the parity information 39 added to the received content data block. If the content data block has been correctly received, the received content data block and CBSN information are stored in the data storage unit 18 in the mobile phone 6 in step S16.

  Next, when it is confirmed by the parity check that the content data block has been normally received, the communication control unit 30 of the mobile phone 6 receives the data from the packet exchange call unit 32 of the distribution apparatus 1 in step S17. Send confirmation. At the same time, in step S18, the communication control unit 30 notifies the application unit 31 of the mobile phone 6 of data reception of the content data block and sends the received CBSN information of the content data block to the application unit 31. Notice.

  For example, when the content data block received in step S13 is the first content data block among the entire stream data divided into several content data blocks, the communication control unit 30 in step S18. As the CBSN information transmitted to the application unit 31, CBSN information (CBSN = 1) indicating that the first content data block has been received is transmitted.

  A series of operations from the start of counting (counting) by the retransmission control timer to the notification of CBSN information from Step S12 to Step S18 is the transfer of all content data blocks corresponding to all stream data to be transferred. It is repeated until is finished. That is, the operation from step S19 to step S25 in the detailed sequence diagram shown in FIG. 4 is a flow of the operation for receiving the second content data block (CBSN = 2) from the packet exchange call 32 of the distribution apparatus 1. The operations from step S26 to step S32 respectively show the flow of the operation of receiving the third content data block (CBSN = 3) from the packet switching call 32 of the distribution apparatus 1.

  In this way, a series of operations from the start of counting (counting) by the retransmission control timer to the notification of the CBSN information is repeatedly performed until the transfer of all content data blocks corresponding to all the stream data to be transferred is completed. . When all the content data blocks are received, the communication control unit 30 of the mobile phone 6 receives a stream indicating that all the content data blocks have been received to the packet exchange call unit 32 of the distribution device 1 in step S33. Send a transfer completion notification. Thereby, the transfer of the content data at “normal time” is completed.

  Next, the application unit 31 starts reproduction of the content data block at a timing when a predetermined number of content data blocks are received. As an example, in the case of this application unit 31, at the timing of receiving CBSN information (CBSN = 2) indicating that the second content data block has been received, playback is performed in order of the block number from the first content data block. Is supposed to start.

  Specifically, in step S25, when the application unit 31 receives CBSN information (CBSN = 2) indicating that the second content data block has been received from the communication control unit 30, in step S34, the above-described step S13. Playback is started from the first content data block (CBSN = 1) received in step.

  In addition, when the application unit 31 starts reproduction of the first content data block, in step S35, the application unit 31 starts timing by the reproduction time management timer, and in step S36, the application unit 31 instructs the communication control unit 30 to A reproduction notification indicating that reproduction of the data block has started and CBSN information of the content data block that has started reproduction are transmitted. In this case, since the reproduction of the first content data block is started, the application unit 31 notifies the communication control unit 30 that the reproduction of the first content data block is started together with the reproduction notification of the content data block. CBSN information (CBSN = 1) will be transmitted.

  Next, in step S37, the application unit 31 detects the timeout of the playback time management timer that manages the playback time of the first content data block (= end of playback of the first content data block). If reception of the second content data block has been completed, reproduction of the second content data block is started in step S38.

In this way, the application unit 31 reproduces each content data block in order from the first content data block, for example, at the timing when the reception notification of the second content data block is received from the communication control unit 30, and the entire stream When the reproduction of all the content data blocks formed by dividing the data is completed, the stream data reproduction process is terminated.
As described above, in this example, since the communication state between the mobile phone 6 and the distribution apparatus 1 is good, a high bit rate is transmitted from the packet exchange call unit 32 of the distribution apparatus 1 via the packet exchange call. Stream data is transmitted, and the high bit rate and high quality stream data is reproduced by the application unit 31 of the mobile phone 6.

[System operation when communication conditions deteriorate]
Next, FIG. 6 shows a sequence diagram of the system operation in the case where data communication is not normally completed due to the deterioration of the communication state. In the sequence diagram of FIG. 6, the reception of the first content data block (CBSN = 1) is normally completed, and the second switch is sent from the packet switching call unit 32 of the distribution apparatus 1 to the communication control unit 30 of the mobile phone 6. The content data block (CBSN = 2) of FIG.

  In the sequence diagram of FIG. 6, a data reception confirmation indicating that the second content data block (CBSN = 2) has been normally received is transmitted from the communication control unit 30 to the packet exchange call unit 32. It shows that the communication state deteriorated (= communication quality deteriorated) while the packet exchange call unit 32 receiving the reception confirmation is transmitting the third content data block (CBSN = 3) to the communication control unit 30. ing.

  When the deterioration of the communication state occurs, the stream data transfer of the third content data block (CBSN = 3) from the packet exchange call unit 32 of the distribution device 1 to the communication control unit 30 of the mobile phone 6 is not completed. The control unit 30 detects a parity error in the parity check of the third content data block in step S41. When detecting the parity error, the communication control unit 30 transmits a data retransmission request for the third content data block (CBSN = 3) in which the parity error is detected to the packet switching call unit 32 in step S42. At the same time, in step S43, timing (counting) by the retransmission control timer is started.

  Still, if the communication quality is not improved and the timeout of the retransmission control timer is detected in step S44, the communication control unit 30 again sends the third content data block (CBSN) to the packet switching call unit 32. = 3) The data retransmission request is transmitted. That is, the communication control unit 30 makes a data retransmission request to the packet exchange call unit 32 of the distribution device 1 when a parity error is detected and the retransmission control timer times out.

  On the other hand, as described above, the application unit 31 of the mobile phone 6 sends a data reception notification (CBSN = 2 data reception notification) of the second content data block from the communication control unit 30 as shown in steps S46 to S50. When received, the reproduction of the content data is started from the first content data block (CBSN = 1) that has already been received. When the application unit 31 starts reproduction of the content data block, the application unit 31 transmits a reproduction notification (CBSN = 1 data reproduction notification) indicating the content data block that has started reproduction to the communication control unit 30.

  Between the communication control unit 30 and the application unit 31, a notification indicating the content data block received in this way (the data reception notification) and a notification indicating the content data block for starting reproduction (the data reproduction notification) are mutually sent. By transmitting and receiving, the received and reproduced content data blocks are mutually monitored.

  Here, when the communication quality is not improved, even when a data retransmission request is made to the packet exchange call unit 32, it is unclear when the content data block will be retransmitted. Further, when the reproduction of the content data block is started, it is necessary to continuously reproduce a series of content data blocks without interruption.

  For this reason, if the reception of the content data block next to the content data block corresponding to the data reproduction notification transmitted from the application unit 31 has not been completed, the communication control unit 30 notifies the circuit switching call unit 33 of the distribution apparatus 1. A request to establish a circuit-switched call is made to the terminal.

  Specifically, in the case of this example, since the reception of the third content data block (CBSN = 3) has not been completed, the communication control unit 30 receives the second content data from the application unit 31 as shown in step S51. When the data reproduction notification (CBSN = 2) of the content data block is received, a request for establishment of a circuit-switched call is made to the circuit-switched call unit 33 of the distribution apparatus 1 in step S52.

  When the circuit-switched call unit 33 of the distribution apparatus 1 receives this circuit-switched call establishment request, it returns a circuit-switched call establishment response to the communication control unit 30 of the mobile phone 6 in step S53. When the communication control unit 30 receives this circuit-switched call establishment response, in this case, the data transfer request for the third content data block, which is a content data block that has not been received yet due to the deterioration of the communication quality. (CBSN = 3 data transfer request) is transmitted to the circuit switching call unit 33 of the distribution apparatus 1.

  When the circuit switching call unit 33 of the distribution apparatus 1 receives this data transfer request, in step S55, among the above-described high bit rate and low bit rate stream data, the low bit rate stream data for circuit switching call is transmitted. The third content data block is transmitted to the communication control unit 30 of the mobile phone 6. As a result, the third content data block that could not be received due to the deterioration in communication quality between the packet exchange call unit 32 of the distribution device 1 and the communication control unit 30 of the mobile phone 6 is transmitted to the distribution device 1. It can be received from the circuit switching call unit 33.

  When the communication control unit 30 of the mobile phone 6 takes in the third content data block on the other line in this way, the third content data received from the circuit switching call unit 33 in step S56 and step S57. A parity check of the block is performed, and if no parity error has occurred, the received third content data block is stored in the mobile phone 6 and CBSN information is stored in the mobile phone 6.

  Then, in step S58, the communication control unit 30 transmits a data reception confirmation indicating that the third content data block has been normally received to the circuit switching call unit 33 of the distribution apparatus 1, and step S59. Then, a CBSN = 3 data reception notification indicating that the third content data block has been received is transmitted to the application unit 31.

  In this way, the third content data block that could not be received due to the deterioration in communication quality between the packet exchange call unit 32 of the distribution device 1 and the communication control unit 30 of the mobile phone 6 is distributed to the distribution device 1. The operation received from the circuit switching call unit 33 is completed while the second content data block is being reproduced in the application unit 31.

  As a result, as shown in step S60, the application unit 31 reproduces the third content data block (CBSN = 3) at the timing when the reproduction of the second content data block (CBSN = 2) is completed. Even if the transmission / reception of the content data block is not normally completed due to the deterioration of the communication quality between the packet switching call unit 32 of the distribution device 1 and the communication control unit 30 of the mobile phone 6, the reproduction can be started. The started stream data can be reproduced continuously without interruption.

  Further, as described above, a common sequence number is assigned to each content data block having a high bit rate and each content data block having a low bit rate. The data content of the high bit rate content data block of each sequence number and the low bit rate content data block are the same data content.

For this reason, it is possible to quickly switch the distribution route of stream data to be switched from a packet-switched call to a circuit-switched call. Even when the distribution route is switched, the stream data can be accurately maintained while maintaining continuity. The stream data can be reproduced.

[System operation when the deteriorated communication status is improved]
Next, FIG. 7 shows a sequence diagram of the system operation when the deteriorated communication state is improved. The sequence diagram of FIG. 7 is a continuation of the sequence diagram shown in FIG. 6, and the communication state remains deteriorated, so that the communication from the circuit switching call unit 33 of the distribution apparatus 1 to the communication of the mobile phone 6 is performed. The illustration is made from the stage when a transmission request for the fourth content data block (CBSN = 4) is made to the control unit 30.

  As described above, the communication control unit 30 of the mobile phone 6 receives the content data block from the circuit-switched call unit 33 of the distribution apparatus 1 when the communication state with the packet-switched call unit 32 of the distribution apparatus 1 deteriorates. However, as shown in step S61 in FIG. 6 and step S62 in FIG. 7, the communication control unit 30 transmits the content to the packet exchange call unit 32 of the distribution apparatus 1 while the communication state is deteriorated. The data block retransmission request is continuously made.

  For example, the communication control unit 30 makes a data transfer request for the fifth content data block (CBSN = 5) to the packet exchange call unit 32 in step S62. When the data transfer request for the sixth content data block (CBSN = 6) is made to the packet switching call unit 32 in step S63, the packet cannot be received in step S64. When the sixth content data block (CBSN = 6) can be received from the exchange call unit 32, this is the sixth from the time of transmission of the data transfer request of the fifth content data block (CBSN = 5). Until the data transfer request of the content data block (CBSN = 6) is transmitted. Which means that the communication state between the communication control unit 30 of the spoke unit 6 and the packet-switched portion 32 of the distribution device 1 is improved.

  When the communication control unit 30 receives the sixth content data block (CBSN = 6) from the packet switching call unit 32, the parity check of the sixth content data block is performed in step S65 and step S66 as described above. The sixth content data block and the CBSN information (CBSN = 6) are stored in the mobile phone to indicate that the data can be normally received if no parity error occurs. In step S68, a data reception notification (CBSN = 6 data reception notification) indicating that the sixth content data block has been normally received is transmitted to the application unit 31.

  The sixth content data block received from the packet exchange call unit 32 is a content data block formed from high bit rate stream data. For this reason, high-quality stream data is reproduced after the sixth content data block.

  Next, since the application unit 31 reproduces the stream data in order from the received content data block, when the reproduction of the fifth content data block (CBSN = 5) is started as shown in step S69, As shown in step S70, a data reproduction notification (CBSN = 5 data reproduction notification) indicating that reproduction of the fifth content data block has been started is transmitted to the communication control unit 30.

  When receiving the data reproduction notification from the application unit 31, the communication control unit 30 receives the sixth content data block, which is the next content data block in this case, from the packet switching call unit 32. It is determined that the communication state between the communication control unit 30 of the mobile phone 6 and the packet exchange call unit 32 of the distribution device 1 has been improved. In step S71, the communication control unit 30 sends a circuit-switched call disconnection request to the circuit-switched call unit 33 that establishes a circuit-switched call when the communication state with the packet-switched call unit 32 deteriorates. I do.

  When this circuit-switched call disconnection request is made, the circuit-switched call unit 33 transmits a circuit-switched call disconnection response to the communication control unit 30 in step S72. The communication control unit 30 of the mobile phone 6 waits for a circuit-switched call disconnect response from the circuit-switched call unit 33 and disconnects the circuit-switched call. Thereby, when the communication state between the communication control unit 30 and the packet switching call unit 32 deteriorates, a circuit-switched call between the communication control unit 30 and the circuit switching call unit 33 temporarily established is The communication can be disconnected when the communication state between the communication control unit 30 and the packet exchange call unit 32 is improved. For this reason, it is possible to prevent inconvenience that two communication lines (packet-switched call and circuit-switched call) are always held in parallel, and wasteful communication costs due to always holding the two communication lines in parallel. Can be prevented.

  Further, as described above, a common sequence number is assigned to each content data block having a high bit rate and each content data block having a low bit rate. The data content of the high bit rate content data block of each sequence number and the low bit rate content data block are the same data content.

For this reason, it is possible to quickly switch the distribution route of stream data to be switched from a circuit-switched call to a packet-switched call, and even when the distribution route is switched, the stream data can be accurately maintained while maintaining the continuity of the stream data. The stream data can be reproduced.

[Operation of each part of content distribution system]
Next, the operation of each part of the content distribution system of this embodiment will be described. The operation of each unit is so-called software control. The main control unit of each unit executes processing based on a predetermined operation program for each unit so that the operation of each unit described below is realized. It has become.

[Operation of Packet Switch Calling Unit 32 of Distribution Device 1]
First, the flow of processing of the packet exchange call unit 32 of the distribution apparatus 1 is shown in the flowchart of FIG. In the flowchart of FIG. 8, when a stream transfer start request is received from the communication control unit 30 of the mobile phone 6 in step S101, the packet exchange call unit 32 receives the high bit rate content data via the packet exchange call in step S102. The block is transmitted to the mobile phone 6 side. After the transmission of the content data block, the event wait state shown in step S103 is entered.

  When the content data block transmitted from the packet exchange call unit 32 cannot be received by the mobile phone 6 due to the deterioration of the communication state in this event waiting state, the communication control unit 30 of the mobile phone 6 A retransmission request is made.

  Therefore, when the packet exchange call unit 32 receives a content data block retransmission request from the communication control unit 30 of the mobile phone 6 (step S104), in step S105, the packet exchange call unit 32 transmits the content data block for which the retransmission request has been made to the mobile phone. Retransmit to 6 side. Then, the process returns to step S103, and the event is waited again.

  Next, the communication control unit 30 of the cellular phone 6 specifies the transfer of a desired content data block by transmitting the CBSN information to the packet exchange call unit 32. The packet exchange call unit 32 performs step S106. When the transfer request for the content data block designated by the CBSN information is received, the content data block having the sequence number corresponding to the designated CBSN information is transmitted to the mobile phone 6 in step S107. Then, the process returns to step S103, and the event is waited again.

  Next, when the content data block transmitted from the packet exchange call unit 32 is normally received on the mobile phone 6 side, the communication control unit 30 of the mobile phone 6 sends the content data block to the packet exchange call unit 32. Send a data receipt confirmation indicating that the block was successfully received. When the packet exchange call unit 32 receives this data reception confirmation in step S108, the process proceeds to step S109, and determines whether or not the transmission of the last content data block of a series of stream data has been completed.

  If the transmission of the last content data block has not been completed, the packet exchange call unit 32 advances the process to step S111. Then, the next content data block is transmitted to the mobile phone 6 side, and the process returns to step S103 to wait for an event again.

  On the other hand, when the transmission of the last content data block is completed, the packet exchange call unit 32 advances the processing to step S110 and enters an event waiting state. In the event waiting state shown in step S110, when the CBSN information is transmitted from the communication control unit 30 of the mobile phone 6 and the transfer of the desired content data block is designated, the packet exchange call unit 32 performs step S113 and step S110. In S114, a content data block having a sequence number corresponding to the CBSN information is transmitted to the mobile phone 6 side. Then, the process returns to step S103, and the event is waited again.

On the other hand, in the event waiting state shown in step S110, a stream transfer completion notification indicating that all content data blocks corresponding to a series of stream data have been received from the communication control unit 30 of the mobile phone 6 (see step S33 in FIG. 4). The packet exchange call unit 32 ends the series of processing shown in the flowchart of FIG. 8 and ends the delivery of stream data to the mobile phone 6.

[Operation of circuit switching call unit 33 of distribution apparatus 1]
Next, the flowchart of FIG. 9 shows a processing flow of the circuit switching call unit 33 of the distribution apparatus 1. In the flowchart of FIG. 9, the communication state between the communication control unit 30 of the mobile phone 6 and the packet exchange call unit 32 of the distribution apparatus 1 deteriorates. In step S121, the communication control unit 30 of the mobile phone 6 starts the circuit switching. When a call establishment request is made, the circuit exchange call unit 33 transmits a circuit exchange call establishment response to the communication control unit 30 of the mobile phone 6 in step S122. Then, the process proceeds to step S123 to enter an event waiting state.

  In this event waiting state, when a data transmission request is received from the communication control unit 30 of the mobile phone 6 in step S124, the circuit switching call unit 33 transmits a low bit rate content data block via a circuit switching call in step S125. To the mobile phone 6 side. Then, after the transmission of the content data block, the process returns to step S123 to wait for an event again.

  In the event waiting state, when a data retransmission request is received from the communication control unit 30 of the mobile phone 6 in step S126, the circuit switching call unit 33, in step S127, transmits the low bit rate for which the retransmission request was made. The content data block is transmitted again to the mobile phone 6 side via a circuit-switched call. Then, after the retransmission of the content data block, the process returns to step S123, and the event is waited again.

  When the communication control unit 30 of the mobile phone 6 receives the content data block via the circuit switching call, the communication control unit 30 transmits a data reception confirmation indicating that the content data block has been received to the packet switching call unit 32. However, when receiving the data reception confirmation in step S128, the packet exchange call unit 32 recognizes that the content data block has been normally received, returns the process to step S123, and waits for the event again. It becomes the state of.

In addition, the communication control unit 30 of the mobile phone 6 performs circuit switching when the communication state with the packet switching call unit 32 is improved or when all content data blocks corresponding to a series of stream data are received. The call switching request is transmitted to the circuit-switched call unit 33 (see step S71 in FIG. 7). When the packet-switched call unit 32 receives this circuit-switched call disconnect request, in step S130, the communication of the cellular phone 6 is performed. A circuit-switched call disconnection response indicating that the disconnection of the circuit-switched call is accepted is transmitted to the control unit 30 (see step S72 in FIG. 7). Then, after transmitting this circuit-switched call disconnection response to the mobile phone 6 side, the series of processing shown in FIG.

[Operation of Communication Control Unit 30 of Mobile Phone 6]
Next, the flowchart of FIG.10 and FIG.11 shows the flow of a process of the communication control part 30 of the mobile telephone 6. FIG. First, in the flowchart of FIG. 10, when the communication control unit 30 of the mobile phone 6 makes a stream transfer start request to the packet exchange call unit 32 in step S131, the time measurement (count) by the retransmission control timer is performed in step S132. Is started, the process proceeds to step S133, and an event is waited for.

  In this event waiting state, when the timeout is counted by the retransmission control timer in step S134, the communication control unit 30 can receive the content data block (= normally) in which the timeout has occurred in step S135. The packet exchange call unit 32 is requested to retransmit the content data block that did not exist, and the process returns to step S132. As a result, counting (counting) by the retransmission control timer for the content data block for which the retransmission request has been made is started again in step S132.

  Next, in the event waiting state, when the communication control unit 30 receives the high bit rate content data block transferred from the packet switching call unit 32 in step S136, in step S137, the communication control unit 30 counts time using the retransmission control timer. Is stopped and the process proceeds to step S138.

  In step S138, the communication control unit 30 performs a parity check of the high bit rate content data block received from the packet exchange call unit 32. If a parity error has occurred, the process proceeds to step S135, where the parity error If no has occurred, the process proceeds to step S139.

  When the process proceeds to step S135 due to the occurrence of a parity error, the communication control unit 30 requests the packet exchange call unit 32 to retransmit the content data block that has not been correctly received, and returns the process to step S132. As a result, the content data block is transferred again from the packet exchange call unit 32.

  On the other hand, when it is determined that the content data block has been correctly received without causing a parity error and the process proceeds to step S139, the communication control unit 30 determines that the received content data block is The data storage unit 18 in the mobile phone 6 is stored and controlled, and the received CBSN information of the content data block is stored and controlled in the data storage unit 18 in the mobile phone 6 in step S140. In step S141, a data reception confirmation indicating that the content data block has been received correctly is transmitted to the packet exchange call unit 32. In step S142, the communication control unit 30 notifies the application unit 31 of the mobile phone 6 of the reception of the content data block and notifies the CBSN information of the received content data block.

  Next, in step S143, the communication control unit 30 determines whether or not the last content data block corresponding to the series of stream data has been received, and if reception of the last content data block has not been completed. The process returns to step S132, and if reception of the last content data block has been completed, the process proceeds to step S144.

  When the process proceeds to step S144 when reception of the last content data block is completed, the communication control unit 30 determines whether or not all CBSN information of each content data block corresponding to a series of stream data has been received. Determine. If there is CBSN information that has not been received, in step S146, the packet exchange call unit 32 is requested to retransmit the CBSN information that has not been received (steps S106, S107, and S113 in FIG. 8). , Refer to step S114), and the process returns to step S132.

  If the reception of all CBSN information has been completed, the communication control unit 30 advances the processing to step S145, and notifies the packet exchange call unit 32 of the completion of stream data transfer (step S33 in FIG. 4). The process of the flowchart of FIG. 10 is terminated.

  On the other hand, when the low bit rate content data block transferred from the circuit switching call unit 33 in step S147 is received in the event waiting state in step S133, the communication control unit 30 in step S148 receives the low bit rate content data block. A parity check is performed on the content data block. If a parity error has occurred, the process proceeds to step S153. If a parity error has not occurred, the process proceeds to step S149.

  When the process proceeds to step S153 due to the occurrence of a parity error, the communication control unit 30 requests the circuit-switched call unit 33 to retransmit the content data block that has not been correctly received, and returns the process to step S133. As a result, the content data block is transferred again from the packet exchange call unit 32, and the communication control unit 30 again enters an event waiting state.

  On the other hand, when it is determined that the content data block has been correctly received without causing a parity error and the process proceeds to step S149, the communication control unit 30 receives from the circuit-switched call unit 33. The stored content data block is controlled to be stored in the data storage unit 18 in the mobile phone 6, and the CBSN information of the content data block received from the circuit switching call unit 33 is stored in the data storage unit in the mobile phone 6 in step S150. 18 is stored and controlled. In step S151, a data reception confirmation indicating that the content data block has been received correctly is transmitted to the circuit switching call unit 33. In step S152, the communication control unit 30 notifies the application unit 31 of the mobile phone 6 of the reception of the content data block, and notifies the CBSN information of the received content data block to perform the processing. The process returns to step S133 to shift to the event waiting state.

  Next, in the event waiting state shown in step S133, when receiving a data reproduction notification indicating the content data block that has been reproduced from the application unit 31 in step S154, the communication control unit 30 performs the process in the flowchart of FIG. The process proceeds to step S155.

  In step S155, the communication control unit 30 determines whether or not the content data block next to the content data block started to be reproduced by the application unit 31 is received from the packet exchange call unit 32, and the packet exchange call unit If the reception of the next content data block from 32 is completed, the process proceeds to step S156, and if the reception of the next content data block from the packet switching call unit 32 is not completed, the process proceeds to step S156. Proceed to S159.

  The completion of reception of the next content data block from the packet exchange call unit 32 means that the communication state between the communication control unit 30 and the packet exchange call unit 32 is good. The circuit-switched call between the communication control unit 30 and the circuit-switched call unit 33 is held even though the communication state between the communication control unit 30 and the packet-switched call unit 32 is good. Things are wasted.

  For this reason, when the processing proceeds to step S156 on the assumption that the reception of the next content data block from the packet switching call unit 32 has been completed, the communication control unit 30 determines that the communication control unit 30, the circuit switching call unit 33, Whether or not a circuit-switched call is established is determined. If a circuit-switched call is established, the process proceeds to step S157.

  In step S157, the circuit-switched call between the communication control unit 30 and the circuit-switched call unit 33 is held even though the communication state between the communication control unit 30 and the packet-switched call unit 32 is good. Therefore, the communication control unit 30 issues a circuit switching call disconnection request to the circuit switching call unit 33, and is transmitted from the circuit switching call unit 33 in response to the disconnection request in step S158. Receive a circuit-switched call disconnect response. When this circuit-switched call disconnection response is received, the circuit-switched call is disconnected, the process returns to step S133 in FIG. 10, and the state again waits for an event.

  On the other hand, when it is determined in step S155 that reception of the next content data block from the packet switching call unit 32 has not been completed, the communication state between the communication control unit 30 and the packet switching call unit 32 is determined. Means it is getting worse. Therefore, the communication control unit 30 determines whether or not a circuit-switched call has been established with the circuit-switched call unit 33 in step S159 in order to receive distribution of the content data block from the circuit-switched call unit 33. .

  If a circuit-switched call is established with the circuit-switched call unit 33, the communication control unit 30 advances the process to step S162, and transfers the content data block that could not be received from the packet-switched call unit 32. Is requested to the circuit-switching call unit 33, the process returns to step S133 in FIG. 10, and the state again waits for an event. As a result, instead of the high bit rate content data block that could not be received from the packet switched call unit 32, the low bit rate content data block is transferred from the circuit switched call unit 33 via the circuit switched call. It will be.

On the other hand, when the circuit switching call is not established with the circuit switching call unit 33, the communication control unit 30 advances the processing to step S160 and sends the line switching call unit 33 of the distribution apparatus 1 to the line switching call unit 33. Request establishment of an exchange call. When a circuit-switched call establishment response indicating that a circuit-switched call has been established is received from the circuit-switched call unit 33 in step S161, the content data that could not be received from the packet-switched call unit 32 in step S162. Block transfer is requested to the circuit-switched call unit 33, the process returns to step S133 in FIG. 10, and the process again shifts to an event waiting state. As a result, instead of the high bit rate content data block that could not be received from the packet switched call unit 32, the low bit rate content data block is transferred from the circuit switched call unit 33 via the circuit switched call. It will be.

[Operation of Application Unit 31 of Mobile Phone 6]
Next, the flowchart of FIG. 12 shows a processing flow of the application unit 31 of the mobile phone 6. In the flowchart of FIG. 12, the application unit 31 of the mobile phone 6 is in an event waiting state until the communication control unit 30 completes reception of content data blocks for a predetermined number of blocks.

  That is, the application unit 31 waits for an event in step S171, while the number of blocks (n) of content data blocks that have been received based on the data reception notification from the communication control unit 30 in step S172 and step S173 (n Count). Then, the process proceeds to step S174 at the timing when the number of blocks of the content data blocks that have been received reaches the predetermined number of blocks, and the reproduction of the content data blocks is started in order.

  In addition, although it is an example, the application part 31 starts reproduction | regeneration in an order from the 1st content data block at the timing which reception of the 1st content data block and the 2nd content data block was completed.

  Next, when the application unit 31 starts reproduction of the content data block, in step S175, the application unit 31 notifies the communication control unit 30 of a notification (CBSN reproduction start notification) indicating the content data block that has started reproduction. Proceed to S176. With this CBSN playback start notification, the communication control unit 30 recognizes the content data block for which playback has started.

  Next, in step S176, the communication control unit 30 starts timing by the playback time management timer for managing the playback time of the content data block that has started playback, proceeds to step S177, and waits for an event. It becomes a state.

  Next, while the application unit 31 reproduces the content data block, the content data block is successively received from the packet-switched call unit 32 or the circuit-switched call unit 33 continuously. Each time reception of each content data block is completed, the communication control unit 30 notifies the application unit 31 of CBSN data reception indicating that reception of the content data block is completed.

  For this reason, when the application unit 31 is waiting for an event in step S177, when the CBSN data reception notification is received from the communication control unit 30 in step S182, the reception is completed in step S183. The CBSN information indicating the content data block is stored in the data storage unit 18, and the process returns to step S177 to wait for an event again. The CBSN information stored in the data storage unit 18 is used when the application unit 31 determines the presence or absence of a reproducible content data block, as will be described below.

  On the other hand, when the application unit 31 is waiting for an event in step S177, a time-out has occurred in the time measured by the reproduction time management timer in step S178. This means that the content data block is normally reproduced. Means not. Therefore, the application unit 31 advances the processing to step S179, and whether or not the communication control unit 30 has received a CBSN data reception notification indicating that the content data block next to the content data block in which the timeout has occurred has been received. Is determined based on the CBSN information stored in the data storage unit 18 (see step S182 and step S183).

  If the CBSN data reception notification corresponding to the next content data block has been received, the application unit 31 returns the process to step S174 and reproduces the next content data block. In this case, reproduction is resumed from the content data block next to the content data block in which the timeout has occurred.

  On the other hand, when the CBSN data reception notification corresponding to the next content data block has not been received, the application unit 31 advances the processing to step S180, and the content data block in which the timeout has occurred is a series of It is determined whether it is the last content data block of the stream data.

  If the content data block in which the time-out has occurred is not the last content data block of a series of stream data, the content data block can be reproduced until reception of the next content data block to be reproduced is completed. Since it cannot be performed, in step S181, time counting by a reception waiting timer is started, and the process returns to step S177 to wait for an event.

If the content data block in which the timeout has occurred is the last content data block of a series of stream data, there is no content data block to be reproduced next, so the series of processing shown in the flowchart of FIG. Exit.

[Effect of the embodiment]
As is apparent from the above description, the content distribution system of this embodiment is configured so that the packet exchange call unit between the mobile phone 6 and the distribution device 1 when the communication state between the distribution device 1 and the mobile phone 6 is good. When a packet exchange call is established between the mobile phone 6 and the mobile device 6 and the mobile phone 6 is deteriorated in communication state between the mobile device 6 and the mobile device 6. A circuit-switched call is established with the circuit-switched call unit 33 to receive low bit rate stream data.

  Thereby, even when the communication state between the distribution device 1 and the mobile phone 6 deteriorates, it is possible to continuously reproduce a series of stream data without interruption. For this reason, it is possible to reduce the stress that the user receives due to the stream data reproduction operation being interrupted.

  Even when the communication state between the distribution apparatus 1 and the mobile phone 6 deteriorates, the entire content (video and audio when the content is movie content) can be received via the circuit switching call. For this reason, the stress which a user receives when the communication state between the distribution apparatus 1 and the mobile phone 6 deteriorates can be further reduced.

  In addition, when the content distributed as stream data is a music content, the change of a bit rate has the characteristic that a user cannot recognize easily. For this reason, even if the high bit rate music content and the low bit rate music content are switched according to the communication state between the distribution apparatus 1 and the mobile phone 6, the switching is performed with little notice to the user. It can be performed.

  Further, even when the communication state between the distribution device 1 and the mobile phone 6 deteriorates, it is possible to perform continuous playback without interrupting playback of a series of stream data. When creating a stream playback content for a terminal device, the content can be created on the premise of the highest wireless communication quality, so that the quality of the created content can be improved.

  In addition, a circuit-switched call established between the mobile phone 6, the distribution device 1, and the circuit-switched call unit 33 is a timing at which the communication state between the mobile phone 6 and the packet-switched call unit 32 of the distribution device 1 is improved. It is designed to cut with

  For this reason, it is possible to prevent inconvenience that two communication lines (packet-switched call and circuit-switched call) are always held in parallel, and wasteful communication costs due to always holding the two communication lines in parallel. Can be prevented.

  Further, as described above, a common sequence number is assigned to each content data block having a high bit rate and each content data block having a low bit rate. The data content of the high bit rate content data block of each sequence number and the low bit rate content data block are the same data content.

Therefore, when switching the stream data distribution path from the circuit switched call to the packet switched call, and when switching the stream data distribution path from the packet switched call to the circuit switched call, the switching of the distribution path is performed by the user's specific operation. Can be performed automatically and quickly without the need for stream data, and even when the delivery route is switched, the stream data can be accurately reproduced while maintaining the continuity of the stream data. be able to.

[Modification]
In the description of the above-described embodiment, the content distribution system to which the present invention is applied distributes stream data to a mobile phone, which is a PHS telephone (PHS: Personal Handyphone System), a PDA device ( Stream data may be distributed to other terminal devices such as a PDA (Personal Digital Assistant), a notebook personal computer device, and a stationary personal computer device. Even in this case, the same effect as described above can be obtained.

  In addition, content data at a low bit rate is distributed via a circuit-switched call. However, if sufficient bandwidth is secured for a circuit-switched call, it is the same as content data transmitted via a packet-switched call. High bit rate content data may be distributed. In this case, even if the communication state between the mobile phone 6 and the packet switching call unit 32 of the distribution device 1 deteriorates, the circuit switching established between the mobile phone 6 and the circuit switching call unit 33 of the distribution device 1 Since it is possible to receive high-bit-rate content data via a call, it is possible to always receive high-quality content data.

  In addition, a series of stream data is stored in the database of the distribution apparatus 1, and when the distribution apparatus 1 performs distribution, the series of stream data is divided into a plurality of content data blocks and transmitted. However, this is because the content data block formed by dividing each series of stream data of low bit rate and high bit rate in advance is stored in the database, and the distribution apparatus 1 performs this content from the database at the time of distribution. Data blocks may be read in order of block numbers and distributed.

  Finally, the above-described embodiment is merely disclosed as an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and according to the design or the like, as long as the technical idea according to the present invention is not deviated from other embodiments. Of course, various modifications are possible.

1 is a system diagram of a content distribution system according to an embodiment to which the present invention is applied. It is a block diagram of a mobile phone used in the content distribution system of the embodiment. It is a sequence diagram which shows the basic content delivery operation | movement of the content delivery system of embodiment. It is a sequence diagram which shows the content delivery operation | movement between a mobile telephone and a delivery apparatus in case the communication state of the content delivery system of embodiment is normal. It is a figure which shows an example of the format of the content data block transmitted / received in the content delivery system of embodiment. It is a sequence diagram which shows the content delivery operation | movement between a mobile telephone and a delivery apparatus when the communication state of the content delivery system of embodiment deteriorates. It is a sequence diagram which shows the content delivery operation | movement between a mobile telephone and a delivery apparatus in the case where it improves after the communication state of the content delivery system of embodiment deteriorates. It is a flowchart for demonstrating operation | movement of the packet switching call part provided in the delivery apparatus of the content delivery system of embodiment. It is a flowchart for demonstrating operation | movement of the circuit switching call part provided in the delivery apparatus of the content delivery system of embodiment. It is a flowchart for demonstrating operation | movement of the communication control part provided in the mobile telephone of the content delivery system of embodiment. It is a flowchart for demonstrating operation | movement of the communication control part provided in the mobile telephone of the content delivery system of embodiment. It is a flowchart for demonstrating operation | movement of the application part provided in the mobile telephone of the content delivery system of embodiment.

Explanation of symbols

  1 distribution device, 2 network interface (network IF), 3 communication network, 4 exchange, 5 base station, 6 mobile phone, 11 antenna, 12 antenna duplexer, 13 reception demodulation unit, 14 reception data decoding unit, 15 control unit, 16 input unit, 17 display unit, 18 data storage unit, 19 speaker unit, 20 incoming notification unit, 21 transmission data encoding unit, 22 transmission modulation unit, 35 content identification number (content ID), 36 block number information, 37 CBSN Information (CBSN: content block sequence number), 38 content block data body, 39 parity information

Claims (6)

Circuit-switched network content data and packet-switched network content data having a higher quality than the circuit-switched network content data, delivering the circuit-switched network content data via the circuit-switched network, and packet switching When receiving any one of the content data from the content distribution device that distributes the content data for the packet switching network via the network, the content distribution device is connected to the content distribution device via the packet switching network or the circuit switching network. A communication line establishing means for establishing a communication line of
Communication quality detecting means for detecting the communication quality of the packet switching network;
When receiving the content data, the communication line establishment unit is controlled to establish a communication line with the content distribution apparatus via the packet switching network, and the communication quality detecting unit controls the packet switching network. The communication line establishment means is controlled to establish a communication line with the content distribution apparatus via the circuit switching network when the communication quality deterioration is detected, and the communication quality detection means Controls the communication line establishment means to disconnect the communication line established with the content distribution apparatus via the circuit switching network when the communication quality of the packet switching network is improved. Connected network control means,
The packet switching network content data received from the content distribution device via the circuit switching network or having a higher quality than the circuit switching content data via the packet switching network It receives a reception processing means for performing predetermined data processing corresponding to the content data
A mobile terminal device. The mobile terminal device according to claim 1,
The packet-switched network content data and the circuit-switched network content data distributed from the content distribution device are each composed of a plurality of content data blocks formed by dividing a series of content data, and the packet The content data block for the switching network and the content data block for the circuit switching network have the same block numbers attached to the content data blocks having the same data contents, respectively.
The circuit for the circuit-switched network having the same block number as the content-data block for the packet-switched network that could not be received via the packet-switched network due to deterioration in communication quality of the packet-switched network. A mobile terminal device that receives a data block via the circuit switching network. Communication line establishment means for establishing a communication line via a packet switching network and a communication line via a circuit switching network with a delivery target device that receives distribution of content data;
To distribute the content data blocks formed by dividing a series of content data through the circuit-switched network, with the same block numbers assigned to the content data blocks having the same data content. Circuit switched network content data, and a database storing packet switched network content data to be distributed through the packet switched network, which is of higher quality than the circuit switched network content data ,
By detecting a good communication quality of the packet switching network by the delivery target device, only the communication line through the packet switching network is established between the delivery line establishing unit and the delivery target device. The packet switched network content data stored in the database is distributed to the delivery target device via the packet switched network, and the delivery target device detects a deterioration in communication quality of the packet switched network. Thus, when a communication line through the packet switching network and a communication line through the circuit switching network are established with the delivery target device, the communication quality of the packet switching network by the delivery target device is established. above until improved is detected, the content data packet switching network which is stored in the database, via the packet switching network The circuit-switched network content data having the same block number as the packet-switched network content data distributed to the delivered device via the packet-switched network and the circuit-switched network content data A content distribution device comprising: distribution means for distributing to the distribution target device through Communication line establishment means for establishing a communication line via a packet switching network and a communication line via a circuit switching network with a delivery target device that receives distribution of content data;
A database storing packet-switching network content data for distribution via the packet-switching network and circuit-switching network content data for distribution via the circuit-switching network;
By detecting a good communication quality of the packet switching network by the delivery target device, only the communication line through the packet switching network is established between the delivery line establishing unit and the delivery target device. The packet switched network content data stored in the database is distributed to the delivery target device via the packet switched network, and the delivery target device detects a deterioration in communication quality of the packet switched network. Thus, when a communication line through the packet switching network and a communication line through the circuit switching network are established with the delivery target device, the communication quality of the packet switching network by the delivery target device is established. above until improved is detected, the content data packet switching network which is stored in the database, via the packet switching network With delivery to the distribution apparatus, the target delivery device the circuit switched network content data same block numbered and delivery packet switched network content data via the packet switching network, said circuit switching network A content distribution device comprising: distribution means for distributing to the distributed device via
Communication line establishment means for establishing a communication line with the content distribution apparatus via the packet switching network or the circuit switching network when receiving content data from the content distribution apparatus;
Communication quality detecting means for detecting the communication quality of the packet switching network;
When receiving the content data, the communication line establishment unit is controlled to establish a communication line with the content distribution apparatus via the packet switching network, and the communication quality detecting unit controls the packet switching network. The communication line establishment means is controlled to establish a communication line with the content distribution apparatus via the circuit switching network when the communication quality deterioration is detected, and the communication quality detection means Controls the communication line establishment means to disconnect the communication line established with the content distribution apparatus via the circuit switching network when the communication quality of the packet switching network is improved. Connected network control means,
A content receiving device comprising: receiving processing means for receiving the content data distributed from the content distribution device via any one of the networks and performing predetermined data processing corresponding to the content data; Distribution system. The content distribution system according to claim 4 ,
The packet-switched network content data and the circuit-switched network content data stored in the content distribution apparatus database are each composed of a plurality of content data blocks formed by dividing a series of content data. The packet switching network content data block and the circuit switching network content data block have the same block number attached to the content data block of the same data content, respectively.
The receiving processing means of the delivery target device has the same block number as the content data block for the packet switching network that could not be received via the packet switching network due to deterioration of communication quality of the packet switching network. A content distribution system for receiving a content data block for a switching network via the circuit switching network. Circuit-switched network content data and packet-switched network content data having a higher quality than the circuit-switched network content data, delivering the circuit-switched network content data via the circuit-switched network, and packet switching A communication program for receiving any one of the content data from a content distribution device that distributes the content data for the packet switching network via a network ,
When receiving the content data, the computer functions as communication quality detection means for detecting communication quality of the communication line of the packet switching network established by the communication means,
When the content data is received, the communication means is controlled to establish a communication line with the content distribution apparatus via the packet switching network, and the computer is caused to function as the communication quality detection means. While the good communication quality of the packet switching network is detected, the communication means is controlled to receive the high-quality packet switching network content data via the packet switching network, and the computer controls the communication quality. If deterioration of the communication quality of the packet switched network in function as an detector means is detected, established to content data for said packet switching network the communication line between the content delivery apparatus via the line switching network controls the communication unit to receive content data for the circuit switched network instead of Computing Communication line established with the content distribution apparatus via the circuit-switched network when the communication quality of the packet-switched network is detected to be improved by functioning as a communication quality detecting means. And a computer functioning as connection network control means for controlling the communication means so as to receive the high-quality packet switching network content data via the packet switching network .

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