JP4316462B2 - Mobile communication system and mobile communication terminal - Google Patents

Description

  The present invention relates to a mobile communication system including a mobile communication terminal and a streaming server, and a mobile communication terminal used in this system.

  There are two methods for reproducing content data such as video data and sound data stored in a server on a network with a communication terminal, a download reproduction method and a streaming reproduction method. In the former method, since all of the content data is downloaded to the communication terminal and then the content data is reproduced, the content data cannot be reproduced unless the download of all the content data is completed. Therefore, there is a disadvantage that the time required from the start of content data acquisition to the start of reproduction becomes longer. On the other hand, the latter method is advantageous in that the time required from the start of acquisition of content data to the start of reproduction can be shortened compared to the download reproduction method because content data is received and reproduced sequentially from the received data portion. . In addition, the download reproduction method has a drawback that it is necessary to provide a large-capacity storage unit in the communication terminal that can store all content data. On the other hand, the streaming playback method generally has an advantage that the capacity of the storage means provided in the communication terminal is smaller than that of the download playback method because the data portions that have been played are generally discarded sequentially. As such streaming reproduction methods, for example, those described in Patent Document 1 and Patent Document 2 are known.

When reproducing content data on a mobile communication terminal, it is difficult to mount a large-capacity storage means in the mobile communication terminal due to a request for miniaturization or the like. It is desirable to adopt.
FIG. 12 is a sequence flow diagram showing a conventional communication procedure when streaming playback of content data on a mobile phone which is a mobile communication terminal. When trying to reproduce the content data, the mobile phone acquires SDP (Session Description Protocol) data from the server. Then, by referring to various setting items included in the SDP data and transmitting a connection request for streaming communication (streaming session) to the server according to the setting, the server establishes a streaming session in response to the request. Thereafter, when the user performs a content reproduction operation, a content reproduction request is transmitted from the mobile phone to the server, and the server starts transmission of streaming data in response to this request. Thereby, the mobile phone can receive and play the streaming data.
On the other hand, as shown in FIG. 12, when a user performs a pause operation during playback of the streaming data, a pause request is transmitted from the mobile phone to the server. In response to this request, the server stops sending streaming data while maintaining the streaming session. Conventionally, after this suspension, a survival notification is sent from the mobile phone to the server at regular intervals, and the server periodically receives the survival notification, so that the mobile phone is paused. It was the composition which grasps. As long as the server periodically receives the survival notification, the server maintains the streaming session.

JP 2003-333579 A JP 2003-229843 A

  However, there are cases where the user forgets that the reproduction of the content is paused and the mobile phone is left as it is. In this case, the mobile phone continues to transmit the survival notification to the server as described above, resulting in a situation where the streaming session is unnecessarily maintained. If there are too many streaming sessions, congestion may occur in the network. Therefore, it is common to perform congestion control with an upper limit on the number of streaming sessions. As described above, if a useless streaming session continues to be maintained as described above in relation to the upper limit of the number of streaming sessions, the number of sessions that can be used by other users on the server decreases. As a result, there also arises a problem that there may be a user who cannot perform streaming reproduction.

  The present invention has been made in view of the above problems, and the purpose of the present invention is to avoid uselessness even when the user forgets that the playback of the content has been suspended and the mobile communication terminal is left as it is. It is an object of the present invention to provide a mobile communication system and a mobile communication terminal that can suppress the continuous maintenance of a streaming session.

In order to achieve the above object, the invention of claim 1 includes server storage means for storing content data, server communication means for performing data communication with a mobile communication terminal via a network, and connection for streaming data communication. A streaming server having server control means for performing processing for establishing and transmitting streaming data based on the content data using the server communication means, terminal communication means for performing data communication with the streaming server via the network, and And a mobile communication terminal having a terminal control means for performing reception / reproduction processing for receiving and reproducing the streaming data by the terminal communication means, wherein the mobile communication terminal is temporarily stopped The terminal control means has an operation means and a temporary stop release operation means When the operation of the pause operation means is accepted, the reception / reproduction process is paused without transmitting the connection disconnection request to the streaming server, and the operation of the pause release operation means is accepted during the pause. Sometimes the reception / reproduction processing is resumed, and when the operation of the suspension release operation means is not performed until a certain time has passed since the operation of the suspension operation means was accepted, a request for disconnection of the connection is made to the streaming server. Is transmitted using the terminal communication means, and the server control means performs the process of disconnecting the connection when the disconnection request is received.
In this mobile communication system, when the suspension release operation means is not operated until a certain time has elapsed after the suspension operation means of the mobile communication terminal is operated, streaming data is transmitted from the mobile communication terminal to the streaming server. A communication connection disconnection request is transmitted, and the connection is disconnected. Therefore, even if the user forgets that the reproduction of the content has been suspended and the mobile communication terminal is left as it is, the connection is disconnected after a certain period of time has elapsed since the suspension. Therefore, if the user forgets that the playback of the content has been paused and the mobile communication terminal is left as it is, the above-mentioned connection has been maintained unnecessarily. It can be suppressed by the system.
In mobile communication terminals, a charging method corresponding to the amount of data communication is often adopted. In this accounting method, if the user forgets that the content playback has been paused and the mobile communication terminal is left as it is, a data communication fee for a large amount of survival notification is incurred without the user's intention. The problem that it occurs will occur. In addition, there is a problem that the network load increases due to the large number of survival notifications. According to the present mobile communication terminal, since the connection is disconnected after a lapse of a certain time from the temporary stop, such a problem can be reduced.

The invention of claim 2 is a server storage means for storing content data, a server communication means for performing data communication with a mobile communication terminal via a network, and a connection for streaming data communication to establish the content data. A streaming server having server control means for performing processing for transmitting streaming data based on the server communication means, terminal communication means for data communication with the streaming server via the network, and the streaming data In a mobile communication system comprising a mobile communication terminal having terminal control means for performing reception / reproduction processing for reception and reproduction by a terminal communication means, the mobile communication terminal includes a pause operation means, a pause and a releasing operation means, the terminal control means, the pause operation manual When the operation is accepted, without transmitting the connection disconnection request to the streaming server, a temporary stop request for stopping transmission of the streaming data being received is transmitted to the streaming server using the terminal communication means, Streaming data transmitted from the streaming server without receiving the operation of the pause release operation means after the pause request is resumed when the operation of the pause release operation means is accepted during the pause. Is not received for a certain period of time, the connection disconnection request is transmitted to the streaming server using the terminal communication means, and the server control means receives the temporary stop request when the temporary stop is received. Performs processing to stop transmission of streaming data during transmission related to the request , When receiving the disconnection request is characterized in that to perform the process of cutting the connection.
In this mobile communication system, when the mobile communication terminal does not receive the streaming data transmitted from the streaming server for a certain period of time, a connection disconnection request for streaming data communication is transmitted from the mobile communication terminal to the streaming server. , The connection is disconnected. During the pause, the mobile communication terminal does not receive streaming data from the streaming server, so even if the user forgets that the playback of the content has been paused and the mobile communication terminal is left as it is, When a predetermined time has elapsed since the stop, the connection is disconnected. Therefore, as in the mobile communication system according to claim 1, when the user forgets that the reproduction of the content has been suspended and the mobile communication terminal is left as it is, the above connection is conventionally maintained wastefully. This situation can be suppressed by the mobile communication system. In addition, the above-described problems can be reduced.

The invention of claim 3 is a mobile communication terminal used in the mobile communication system of claim 1, terminal communication means for performing data communication with the streaming server via the network, and transmission from the streaming server. Terminal control means for performing reception / reproduction processing for receiving and reproducing the streaming data to be reproduced by the terminal communication means, pause operation means, and pause release operation means, wherein the terminal control means includes When the operation of the pause operation means is accepted, the reception / reproduction processing is paused without transmitting the connection disconnection request to the streaming server, and when the operation of the pause release operation means is accepted during the pause The reception / reproduction process is resumed, and the pause release operation is performed until a predetermined time elapses after the operation of the pause operation means is accepted. When the operation unit is not performed, is characterized in performing the process of transmitting with said terminal communication means a disconnection request of the connection to the streaming server.
When this mobile communication terminal is used in the mobile communication system of claim 1, even if the user forgets that the reproduction of content has been paused and the mobile communication terminal is left as it is, The connection for streaming data communication is disconnected after a lapse of a certain time from the stop. Therefore, it is possible to suppress a situation in which the connection is maintained in vain. In addition, the above-described problems can be reduced.

The invention according to claim 4 is the mobile communication terminal according to claim 3, further comprising timer means for measuring time, and the terminal control means receives the operation of the pause operation means when receiving the timer means. The time measurement of the timer means is reset when the operation of the suspension release operation means is accepted, and the streaming time is measured when the elapsed time measured by the timer means reaches the predetermined time. A process of transmitting the connection disconnection request to the server using the terminal communication means is performed.
This mobile communication terminal can suppress a situation in which a connection for streaming data communication is maintained unnecessarily with a simple configuration, and can also reduce the above-described problems.

Further, the invention of claim 5 is a mobile communication terminal used in the mobile communication system of claim 2, terminal communication means for performing data communication with the streaming server via a network, and transmission from the streaming server. has a terminal control means for receiving and reproducing process for reproducing received by the terminal communication means streaming data, and pause operation means, and a pause release operation means, the terminal control means, the When the operation of the pause operation means is accepted, the terminal communication means is used to send a pause request for stopping transmission of streaming data being received without sending a connection disconnection request for streaming data communication to the streaming server. To the streaming server, and during the pause, Only assigned when the resumes the reception regeneration process, when no fixed time receives streaming data transmitted from the streaming server without receiving an operation of the pause release operation means after said temporary stop request to the streaming server On the other hand, the connection disconnection request is transmitted using the terminal communication means.
When this mobile communication terminal is used in the mobile communication system according to claim 2, even if the user forgets that the reproduction of the content has been suspended and the mobile communication terminal is left as it is, The connection for streaming data communication is disconnected after a lapse of a certain time from the stop. Therefore, it is possible to suppress a situation in which the connection is maintained in vain. In addition, the above-described problems can be reduced.

The invention according to claim 6 is the mobile communication terminal according to claim 5, further comprising timer means for measuring time, wherein the terminal control means measures time of the timer means when the reception / reproduction processing is started. The time measurement of the timer means is restarted each time data transmitted from the streaming server is received, and when the elapsed time measured by the timer means reaches the predetermined time, the streaming server The connection disconnection request is transmitted using the terminal communication means.
This mobile communication terminal can suppress a situation in which a connection for streaming data communication is maintained unnecessarily with a simple configuration.

  The “mobile communication terminal” includes a mobile phone such as a PDC (Personal Digital Cellular) method, a GSM (Global System for Mobile Communication) method, a TIA (Telecommunications Industry Association) method, and an IMT (International Mobile Telecommunications) -2000. Mobile phone standardized in TD-SCDMA (Time Division Synchronous Code Division Multiple Access) TD-SCDMA (MC: Multi Carrier) mobile phone, PHS (Personal Handyphone System), automobile phone, etc. An example is a telephone. The mobile communication terminal only needs to have a display means and be used while being held by a user. In addition to the above-described telephone, a PDA (Personal Digital Assistance) having no telephone function is available. Mobile type mobile communication terminals are also included.

As described above, according to the first to sixth aspects of the present invention, even when the user forgets that the playback of the content has been paused and the mobile communication terminal is left as it is, the streaming session is maintained unnecessarily. An excellent effect that can be suppressed. Furthermore, even if the mobile communication terminal adopts a charging method according to the amount of data communication, it is possible to suppress the occurrence of a large amount of data communication charges for a survival notification during a suspension period not intended by the user. An excellent effect is achieved. Moreover, the outstanding effect that the network load by the large amount of survival notification can be reduced is also show | played.
In particular, according to the inventions of claims 4 and 6, an excellent effect is achieved that it is possible to suppress the occurrence of a user who cannot perform streaming playback with a simple configuration.

Hereinafter, an embodiment in which the present invention is applied to a mobile communication system will be described with reference to the drawings.
FIG. 2 is an explanatory diagram for explaining the overall configuration of a mobile communication system in which a mobile phone as a mobile communication terminal according to the present embodiment can be used.
In this mobile communication system, a mobile phone 20 used by a user has a configuration capable of executing an application program registered by the user. In the present embodiment, the application program is developed by object-oriented programming or the like that does not depend on the platform. As such an application program, an application program written in JAVA (registered trademark, the same applies hereinafter), an application program written in the C ++ language, and an application execution environment of BREW (registered trademark, the same applies hereinafter) operate. Application programs are examples. The application program may be a structured program written in C language, assembly language, or the like. The cellular phone 20 can be connected to a cellular phone communication network 10 as a network. The mobile phone communication network 10 is connected to a streaming server 11 that distributes content data. The streaming server 11 transmits streaming data based on the content data to the mobile phone 20 in response to a request from the mobile phone 20.

  Content data distributed by the streaming server 11 is provided from a content developer such as a content developer. Specifically, for example, it is uploaded from the personal computer on the content developer side to the streaming server 11 via a dedicated line or public line. In addition, a recording medium such as an optical disk or a magnetic disk on which the developed content data is recorded is sent from a content developer to a telecommunications carrier that manages and operates the streaming server 11, and the content data in the recording medium is transmitted by the streaming server 11. It may be provided as read. The content data provided in this way is registered in the streaming server 11 in a state where streaming distribution is possible from the mobile phone 20 via the mobile phone communication network 10. Note that “content data” includes video content data such as a movie combining sound and image, content data consisting only of sound such as music, content data consisting only of an image, and the like.

FIG. 3 is a schematic configuration diagram showing a hardware configuration of the streaming server 11.
The streaming server 11 includes a system bus 100, a CPU 101, an internal storage device, an external storage device 104, an input device 105, and an output device 106. The internal storage device includes a RAM 102, a ROM 103, and the like. The external storage device 104 includes a hard disk drive (HDD), an optical disk drive, and the like. The input device 105 includes a mouse, a keyboard, and the like. The output device 106 includes a display, a printer, and the like. The streaming server 11 further includes a mobile phone communication device 107 as server communication means for communicating with each user's mobile phone 20 via the mobile phone communication network 10. In the present embodiment, the internal storage device and the external storage device 104 function as server storage means.

  The components such as the CPU 101 and the RAM 102 exchange data and program instructions with each other via the system bus 100. Various programs for operating the streaming server 11 according to a predetermined procedure are stored in the ROM 103 or the external storage device 104, and are called up and executed in the work area on the CPU 101 or the RAM 102 as necessary. The streaming server 11 stores content data to be transmitted to the mobile phone 20 in the external storage device 104. In response to a request from the mobile phone 20, the streaming server 11 cooperates with the CPU 101, the RAM 102, the mobile phone communication network communication device 107, and the like to transfer the content data stored in the external storage device 104 to the mobile phone communication network. 10 has a function of transmitting streaming data to the mobile phone 20 through the network 10. Further, it also has a function as a Web server that provides a Web site for introducing content data stored in the external storage device 104. In the present embodiment, when the user of the mobile phone 20 intends to stream the content data, the user first accesses the website and selects the content data to be played back, and then the streaming data based on the selected content data. It will be received and played back. The streaming server 11 may be configured as a dedicated device or may be configured using a general-purpose computer system. Further, it may be configured by a single computer, or may be configured by connecting a plurality of computers each having a plurality of functions via a network.

4 is a front view showing the appearance of the mobile phone 20, and FIG. 5 is a schematic configuration diagram showing the hardware configuration of the mobile phone 20. As shown in FIG.
The mobile phone 20 is a clamshell (folding) type mobile phone, and includes an internal control device including a system bus 200, a CPU 201, a RAM 202, a ROM 203, an input device 204, an output device 205, and a mobile phone communication device 206. ing. Components such as the CPU 201 and the RAM 202 exchange various data and instructions of application programs described later via the system bus 200. The input device 204 includes a data input key (ten key, * key, # key) 21, a call start key 22, an end key 23, a scroll key 24, a multi-function key 25, a microphone 26, and the like. The output device 205 includes a liquid crystal display (LCD) 27 as a display means, a speaker for call 28, an external speaker (not shown), and the like. The mobile phone communication device 206 is for communicating with other mobile phones and the streaming server 11 via the mobile phone communication network 10. Further, in the RAM 202, there are a platform storage area as a first storage means managed by a telephone platform described later and an application storage area as a second storage means managed in an application execution environment described later. Exists. In the present embodiment, the RAM 202 and the ROM 203 function as terminal storage means.

FIG. 6 is a block diagram showing an extracted main part of the mobile phone 20, and FIG. 7 is an explanatory diagram of the software structure in the mobile phone 20.
The cellular phone 20 includes a telephone communication unit 211, a data communication unit 212 as a terminal communication unit, an operation unit 213 as an operation unit, an application program execution management unit 214 as an application program execution unit, a main control unit 215, and an output unit 216. The timer unit 218 as a timer means.

The telephone communication unit 211 performs wireless communication with a base station of the mobile phone communication network 10 in order to perform telephone communication with other mobile phones or fixed phones. This corresponds to the device 206 and the like.
Similar to the telephone communication unit 211, the data communication unit 212 corresponds to the mobile phone communication device 206 having the above-described hardware configuration. The data communication unit 212 exchanges mail with other mobile phones via the mobile phone communication network 10 or connects to an external network such as the Internet from the mobile phone communication network 10 via a gateway server. This is for exchanging e-mails and browsing web pages. The data communication unit 212 is also used to download an application program provided by the streaming server 11 via the mobile phone communication network 10.

  The operation unit 213 includes the above-described numeric keypad 21, call start key 22, end call key 23, and the like operated by the user. By operating the various keys of the operation unit 213, the user inputs data such as a URL to the mobile phone 20, starts and ends a call when receiving a call, selects an application program, It can be started and stopped. In addition, the user can access the Web site provided by the streaming server 11 by operating various keys of the operation unit 213, receive streaming data based on the content data, and reproduce it.

  The application program execution management unit 214 includes the system bus 200, the CPU 201, a part of the RAM 202, and the like. The application program execution management unit 214 corresponds to the central “application execution environment” in the software structure of FIG. 7, and includes a class library, an execution environment management library, and an application program developed by object-oriented programming. Software such as application management is provided to manage the execution environment of application programs. This application execution environment is appropriately selected according to the application program to be executed. For example, if the application program to be executed is written in JAVA, the JAVA application execution environment is selected. If the application program to be executed is written in C language that operates in the BREW execution environment, the BREW application execution environment is selected. If the application program to be executed is written in JAVA, it can be executed by constructing a JAVA application execution environment on the BREW application execution environment.

  Here, the application program can be used by calling a class library such as a function in the application execution environment via a class library API (application interface). The call history of the class library such as this function is stored in the application storage area in the RAM 202 until the virtual execution environment (virtual machine: VM) of the application program is terminated. The application execution environment also saves various data used when executing the application program in the application storage area. When these various data are used, they are read from or written to the application storage area. The execution environment management library in the application execution environment can be used by calling a telephone platform library in the telephone platform described later via the telephone platform API.

  The main control unit 215 controls the telephone communication unit 211, the data communication unit 212, the output unit 216, and the timer unit 218, and includes the above-described system bus 200, CPU 201, RAM 202, and the like. The main control unit 215 functions as a terminal control unit by exchanging control commands and various data with the application program execution management unit 214 and performing control in cooperation with the control command and various data. The main control unit 215 corresponds to the lowermost “telephone platform” in the software structure of FIG. 7 and executes a control program and user interface for controlling the telephone communication unit 211 and the like, Or provide a library. The telephone platform executes various processes in an application program by sending an event to an execution environment management library in the application execution environment, or performs application management software in the application execution environment via an application management API. Can be called and used. When the application execution environment calls and uses the telephone platform library via the telephone platform API, the telephone platform executes processing according to the telephone platform library. For example, the telephone platform reads out data stored in the platform storage area managed by the telephone platform in the RAM 202 based on an instruction from the application execution environment using the telephone platform library, and migrates it to the application storage area. can do.

  The output unit 216 includes the output device 205 including the liquid crystal display 27, the call speaker 28, and an external speaker. The output unit 216 displays the Web page screen received by the data communication unit 212 on the liquid crystal display 27. The liquid crystal display 27 of the output unit 216 is used when the telephone communication unit 211 or the data communication unit 212 notifies the user that information has been received. Specifically, when the information is received, the main control unit 215 displays an incoming call notification image on the liquid crystal display 27 of the output unit 216 or outputs a ring tone from an external speaker. Further, the output unit 216 is also used for outputting video and sound of the reproduced content data during execution of a content reproduction application program (described later) executed in the application execution environment.

  The timer unit 218 can employ a known configuration that can measure time. In the present embodiment, the CPU 201 that executes the timer program measures time based on time data generated by an RTC (Real Time Clock) 209 included in the mobile phone 20.

  A control program for constructing a telephone platform for operating the mobile telephone 20 according to a predetermined procedure is stored in the RAM 202 and the ROM 203. Further, a basic OS (operating system) program, a program for building the application execution environment, and an application program are also stored in the RAM 202 and the ROM 203. These programs are called up and executed in the work area in the CPU 201 or RAM 202 as necessary.

[Operation example 1]
Next, an example of content data streaming playback processing in the mobile communication system (hereinafter, this operation example is referred to as “operation example 1”) will be described. In the present embodiment, the case of streaming playback of video content combining an image (moving image) and sound will be described, but the same applies to other content.

FIG. 8 is a flowchart showing the flow of processing operations of the mobile phone 20 in the first operation example when streaming content data on the mobile phone 20. FIG. 9 is a sequence flow diagram illustrating a communication procedure in the first operation example when streaming the content data with the mobile phone 20.
When trying to reproduce the content data, first, the user operates the key of the operation unit 213 to activate the browser (S1). Then, by operating the key of the operation unit 213, the URL of the content selection site of the streaming server 11 is input and accessed (S2). Accordingly, the main control unit 215 that executes the browser transmits a request to the streaming server 11 specified by the URL. Upon receiving this request, the streaming server 11 transmits the content selection site screen (content list screen) related to the request as a response to the mobile phone 20 that is the transmission source of the request. Thereafter, the user operates the keys of the operation unit 213 to select the desired content from the content list on the screen displayed on the LCD 27 (S3). In response, an instruction to execute the application program is input to the telephone platform shown in FIG. 7, that is, the main control unit 215 shown in FIG. As a result, the main control unit 215 reads the content reproduction application program and activates it (S4). When the application program is started, the application program operates on the application execution environment shown in FIG. 7, that is, the application program execution management unit 214 shown in FIG. The application program may be stored in advance in the ROM 203 of the mobile phone 20 or downloaded from the outside and stored in the RAM 202.

  When the application program is activated, the application program execution management unit 214 performs processing for acquiring SDP (Session Description Protocol) data as terminal setting data corresponding to the selected content according to the content of the application program (S5). Specifically, the application program execution management unit 214 transmits an SDP data acquisition request to the streaming server 11 to the content distribution site that distributes the content data via the main control unit 215 for the content related to the selection. To do. In the first operation example, the mobile phone 20 and the streaming server 11 perform data communication mainly using RTSP (Real Time Streaming Protocol) and RTP (Real-time Transport Protocol). Therefore, here, a DESCRIBE command is transmitted as an SDP data acquisition request. Upon receiving the SDP data acquisition request, the streaming server 11 transmits the SDP data to the mobile phone 20 as a response. The application program execution management unit 214 of the mobile phone 20 that has received the SDP data stores the SDP data in the RAM 202. Thereafter, various setting items included in the SDP data are referred to, and a request for establishing a streaming session (connection for streaming communication) (SETUP command) is transmitted to the streaming server 11 via the main control unit 215 according to the setting. In response to this request, the streaming server 11 establishes a streaming session with the mobile phone 20 and transmits a response to the effect that the streaming session has been established to the mobile phone 20. In the first operation example, the content selection site and the content distribution site are provided by the same streaming server 11, but may be provided by different servers.

  On the other hand, when the content reproduction application program is activated, a content reproduction screen is displayed on the LCD 27. When the user performs an operation for reproducing content on the key of the operation unit 213 (S6), the application program execution management unit 214 sends a content reproduction request (PLAY command) to the streaming server 11 to the main control unit 215. To send through. In response to this request, the streaming server 11 transmits a response indicating that the request has been accepted to the mobile phone 20. Further, the CPU 101 of the streaming server 11 reads out the content data related to the request from the external storage device 104, and starts transmitting the streaming data to the mobile phone 20 (S7).

  The application program execution management unit 214 of the mobile phone 20 sequentially stores the received streaming data in a predetermined buffering area in the RAM 202. When the prescribed amount of streaming data is stored in the buffering area (S8), the application program execution management unit 214 sequentially reads the streaming data from the buffering area in the RAM 202 and starts reproduction (S9). Specifically, the application program execution management unit 214 outputs a streaming data reproduction command to the output unit 216 via the main control unit 215. Thus, an image based on the streaming data is displayed on the LCD 25 of the output unit 216, and sound based on the streaming data is output from the external speaker of the output unit 216, so that the user can view the content.

  Thereafter, when the user performs an operation for pausing the reproduction of the content with respect to the key of the operation unit 213 during the content reproduction (S10), a pause process described later is performed (S20). Further, when the user performs an operation for stopping the reproduction of the content with respect to the key of the operation unit 213 during the content reproduction (S11), the application program execution management unit 214 outputs the output unit via the main control unit 215. A command to stop the output of content is output to 216. Further, the application program execution management unit 214 transmits a playback stop request (TEARDOWN command) to the streaming server 11 via the main control unit 215. In response to this request, the streaming server 11 disconnects the streaming session with the mobile phone 20 and transmits a response to the mobile phone 20 indicating that the streaming session has been disconnected. The same applies to the case where the content is reproduced to the end and the reproduction is finished (S12).

Next, a pause process for pausing the reproduction of content data, which is a characteristic part of the present invention, will be described.
FIG. 1 is a flowchart showing a flow of a pause process according to the first operation example. When the user performs an operation for temporarily stopping the reproduction of the content with respect to the key of the operation unit 213 during the content reproduction (S10), the application program execution management unit 214 sends the timer unit 218 via the main control unit 215. Outputs measurement start command. Thereby, the timer unit 218 starts measuring time (S21). In addition, the application program execution management unit 214 starts processing to periodically transmit a survival notification (ReceiverReport) using RTCP (RTP Control Protocol) to the streaming server 11 via the main control unit 215 (S22). . Note that RTSP: OPTIONS may be used as the survival notification. The streaming server 11 continues to maintain the streaming session with the mobile phone 20 by continuously receiving the survival notification.

  If the user performs a pause cancel operation for resuming content playback on the keys of the operation unit 213 before the time counted by the timer unit 218 elapses a predetermined time (predetermined time) determined in advance ( S23), the application program execution management unit 214 outputs a reset command to the timer unit 218 via the main control unit 215. Thereby, the timer part 218 complete | finishes measurement of time, and resets the time measured to zero (S28). On the other hand, when the time counted by the timer unit 218 reaches a specified time without the user performing a pause canceling operation (S24), the application program execution management unit 214 stops transmitting the survival notification (S25). ) A reproduction stop request (TEARDOWN command) is transmitted to the streaming server 11 via the main control unit 215 (S26). In response to this request, the streaming server 11 disconnects the streaming session with the mobile phone 20 and transmits a response to the mobile phone 20 indicating that the streaming session has been disconnected. Upon receiving this, the application program execution management unit 214 of the mobile phone 20 causes the output unit 216 to display a playback stop message indicating that playback of the paused content has been stopped on the liquid crystal display 27 (S27). Then, the application program execution management unit 214 outputs a reset command to the timer unit 218 via the main control unit 215, and the timer unit 218 ends the time measurement and resets the measured time to zero (S28). . Thereafter, the application program execution management unit 214 may transmit an application program end command to the main control unit 215. In this case, by ending the application program, the load on the CPU 201 can be reduced and wasteful power consumption can be suppressed.

  As described above, in the first operation example, after the user performs the pause operation and pauses the reproduction of the content, the reproduction stop request (TEARDOWN command) is automatically sent from the mobile phone 20 when the specified time has elapsed. 11 and the streaming session is disconnected. Therefore, even if the user forgets that the playback of the content has been suspended and the mobile phone 20 is left as it is, the streaming session is disconnected after the specified time has elapsed, and the situation in which the session is continuously maintained can be suppressed. . Further, in the first operation example, even when a billing method corresponding to the data communication amount is adopted for the mobile phone 20, the above specified time is set when the user forgets that the content reproduction has been paused. When the time elapses, transmission of the survival notification (ReceiverReport) stops. Therefore, it is possible to suppress a problem that a large amount of data communication charges for surviving notifications occur without the user's intention. Further, it is possible to suppress a problem that the network load increases due to the large number of survival notifications.

[Operation example 2]
Next, in the mobile communication system according to the present embodiment, an example of the unreceivable process when the streaming data transmitted from the streaming server 11 cannot be received by the mobile phone 20 (hereinafter referred to as “operation example 2”). Will be described. The basic processing flow for streaming playback is the same as that in the first operation example.
FIG. 10 is a flowchart showing the flow of the reception disable process in the second operation example. FIG. 11 is a sequence flow diagram illustrating a communication procedure according to the second operation example when streaming content data with the mobile phone 20. When the user performs an operation for reproducing content on the key of the operation unit 213 (S6, S31), as described above, the application program execution management unit 214 makes a content reproduction request (PLAY) to the streaming server 11. Command) via the main control unit 215. In response to this request, the streaming server 11 transmits a response indicating that this request has been accepted to the mobile phone 20. Further, the CPU 101 of the streaming server 11 reads the content data related to this request from the external storage device 104, and starts transmitting the streaming data to the mobile phone 20 (S7). In the second operation example, when an operation for reproducing content is performed, the application program execution management unit 214 outputs a measurement start command to the timer unit 218 via the main control unit 215. Thereby, the timer unit 218 starts measuring time (S32). That is, in the second operation example, the timer is not started when the user performs the pause operation as in the first operation example, but the timer is started when the content reproduction operation is performed.

  As shown in FIG. 10, the application program execution management unit 214 of the second operation example transmits a restart command to the timer unit 218 every time streaming data is received (S33). The timer unit 218 starts measuring time from the beginning every time the restart command is received (S34). On the other hand, when the time counted by the timer unit 218 reaches the specified time without receiving the streaming data (S35), the application program execution management unit 214 stops the transmission of the survival notification (S36), and the streaming server 11 A playback stop request (TEARDOWN command) is transmitted via the main control unit 215 (S37). For example, when the user performs an operation for temporarily stopping the reproduction of the content with respect to the key of the operation unit 213 during the content reproduction (S10), only the survival notification is periodically transmitted from the mobile phone 20 as described above. The streaming data is not transmitted from the streaming server 11. That is, during this temporary suspension period, the application program execution management unit 214 does not receive streaming data, so the timer is not reset. Then, when the time counted by the timer unit 218 reaches the specified time without performing a pause canceling operation by the user (S35), as described above, the transmission of the survival notification is stopped (S36), and the reproduction is stopped. A request is transmitted (S37).

  In response to this request, the streaming server 11 disconnects the streaming session with the mobile phone 20 and transmits a response to the mobile phone 20 indicating that the streaming session has been disconnected. Receiving this, the application program execution management unit 214 of the mobile phone 20 causes the output unit 216 to display a playback stop message indicating that the playback of the content has been stopped on the liquid crystal display 27 (S38). Then, the application program execution management unit 214 outputs a reset command to the timer unit 218 via the main control unit 215, and the timer unit 218 ends the time measurement and resets the time measured to zero (S39). . Thereafter, the application program execution management unit 214 may transmit an application program end command to the main control unit 215 as in the case of the first operation example.

As described above, in the second operation example, when the user performs a pause operation and the streaming data transmitted from the streaming server 11 cannot be received by the mobile phone 20, the specified time has elapsed since the last data reception. After that, a playback stop request (TEARDOWN command) is automatically transmitted from the mobile phone 20 to the streaming server 11, and the streaming session is disconnected. Therefore, even if the user forgets that the playback of the content has been suspended and the mobile phone 20 is left as it is, the streaming session is disconnected after the specified time has elapsed since the last streaming data was received, It is possible to suppress the situation where the session is continuously maintained in vain. Therefore, also in this operation example 2, similarly to the above operation example 1, it is possible to suppress a problem that a large amount of data communication charges are generated for the life notification without the intention of the user. It is possible to suppress a problem that the network load increases.
In the second operation example, the case where the user performs a pause operation as an example of the situation where the time counted by the timer unit 218 reaches the specified time without receiving the streaming data after the reproduction operation is described as an example. This situation can occur in other cases. For example, when a failure occurs in the mobile phone 20, there may occur a situation in which the session continues to be wasted without receiving streaming data during content playback. Also in this case, the time counted by the timer unit 218 may reach the specified time. According to the second operation example, it is possible to suppress a situation where the session is continuously maintained even in such a case.

In the operation example 1 and the operation example 2 described above, a reproduction stop request (TEARDOWN command) is transmitted to the streaming server 11 when the specified time is reached, but this transmission is not always necessary. That is, since the streaming server 11 of this embodiment operates so as to disconnect the streaming session when the survival notification is no longer received, the streaming session only stops the transmission of the survival notification without transmitting the playback stop request. Is cut off. However, there is no guarantee that all streaming servers that can be accessed by the mobile phone 20 operate in this way. Therefore, in order to reliably disconnect the streaming session, it is desirable not only to stop the transmission of the survival notification but also to transmit a playback stop request (TEARDOWN command).
Further, the present invention is useful not only for the mobile phone 20 described above but also for other mobile communication terminals capable of streaming reproduction.

The flowchart which shows the flow of the temporary stop process which concerns on the operation example 1 performed with a mobile telephone. Explanatory drawing for demonstrating the whole structure of the mobile communication system which can use the mobile phone. The schematic block diagram which shows the hardware constitutions of the streaming server which comprises the mobile communication system. The front view which shows the external appearance of the mobile phone. The schematic block diagram which shows the hardware constitutions of the mobile phone. The block diagram which extracted and showed the principal part of the mobile phone. Explanatory drawing of the software structure in the mobile phone. 6 is a flowchart showing a flow of processing operations according to an operation example 1 when streaming content data on the mobile phone. The sequence flow figure which shows the communication procedure which concerns on the operation example 1 at the time of streaming-reproducing content data with the same mobile telephone. The flowchart which shows the flow of the reception impossible process which concerns on the operation example 2 at the time of streaming-reproducing content data with the same mobile phone. The sequence flow figure which shows the communication procedure which concerns on the operation example 2 at the time of streaming-reproducing content data with the same mobile telephone. The sequence flow figure which shows the conventional communication procedure at the time of carrying out streaming reproduction of content data with a mobile telephone.

Explanation of symbols

10 cellular phone communication network 11 streaming server 20 cellular phone 21 numeric keypad 27 liquid crystal display 209 RTC
213 Operation unit 214 Application program execution management unit 215 Main control unit 216 Output unit 218 Timer unit

Claims (6)

Server storage means for storing content data, server communication means for performing data communication with a mobile communication terminal via a network, and streaming data based on the content data by establishing a connection for streaming data communication. A streaming server having server control means for performing processing to transmit using
A mobile communication terminal having terminal communication means for performing data communication with the streaming server via the network, and terminal control means for performing reception / reproduction processing for receiving and reproducing the streaming data by the terminal communication means; In a mobile communication system comprising:
The mobile communication terminal has a pause operation means and a pause release operation means,
The terminal control means pauses the reception / playback processing without transmitting the connection disconnection request to the streaming server when receiving an operation of the pause operation means, and the pause release operation means during the pause When the operation is received, the reception / reproduction process is resumed, and when the operation of the pause release operation means is not performed until a predetermined time has elapsed since the operation of the pause operation means was accepted, A process for transmitting the connection disconnection request using the terminal communication means;
The mobile communication system, wherein the server control means performs a process of disconnecting the connection when the disconnection request is received. Server storage means for storing content data, server communication means for performing data communication with a mobile communication terminal via a network, and streaming data based on the content data by establishing a connection for streaming data communication. A streaming server having server control means for performing processing to transmit using
A mobile communication terminal having terminal communication means for performing data communication with the streaming server via the network, and terminal control means for performing reception / reproduction processing for receiving and reproducing the streaming data by the terminal communication means; In a mobile communication system comprising:
The mobile communication terminal has a pause operation means and a pause release operation means,
When the terminal control means receives the operation of the pause operation means , the terminal control means sends a pause request for stopping transmission of the streaming data being received without sending the connection disconnection request to the streaming server. When the operation of the pause release operation means is accepted during the pause, the reception / reproduction process is resumed, and after the pause request, the operation of the pause release operation means is accepted. when not streaming data transmitted from the streaming server to receive a predetermined time without a disconnection request of the connected performs processing of transmitting using said terminal communication means with respect to the streaming server,
The server control means, upon receiving the pause request performs a process of stopping the transmission of the streaming data being transmitted in accordance with the temporary stop request, when receiving the disconnection request, it disconnects the connection processing A mobile communication system. A mobile communication terminal used in the mobile communication system according to claim 1,
Terminal communication means for performing data communication with the streaming server via a network;
Terminal control means for performing reception / reproduction processing for receiving and reproducing streaming data transmitted from the streaming server by the terminal communication means;
A pause operation means;
A temporary stop release operation means,
When the terminal control means receives the operation of the pause operation means, the terminal control means pauses the reception / playback process without transmitting the connection disconnection request to the streaming server, and the pause release operation during the pause When the operation of the means is accepted, the reception / reproduction process is resumed. When the operation of the pause release operation means is not performed until a predetermined time has elapsed since the operation of the pause operation means was accepted, A mobile communication terminal characterized by performing processing for transmitting the connection disconnection request using the terminal communication means. The mobile communication terminal according to claim 3, wherein
Having timer means for measuring time,
The terminal control means starts time measurement of the timer means when receiving an operation of the pause operation means, and resets time measurement of the timer means when receiving an operation of the pause release operation means. When the elapsed time measured by the timer means reaches the certain time, the mobile body performs processing for transmitting the connection disconnection request to the streaming server using the terminal communication means. Communication terminal. A mobile communication terminal used in the mobile communication system according to claim 2,
Terminal communication means for performing data communication with the streaming server via a network;
Terminal control means for performing reception / reproduction processing for receiving and reproducing streaming data transmitted from the streaming server by the terminal communication means ;
A pause operation means;
A temporary stop release operation means ,
When the terminal control means accepts the operation of the pause operation means , the terminal control means does not send a connection disconnection request for streaming data communication to the streaming server, and stops the transmission of streaming data being received. Is transmitted to the streaming server using the terminal communication means, and when the operation of the pause release operation means is accepted during the pause, the reception reproduction process is resumed, and the pause release operation means is issued after the pause request. When the streaming data transmitted from the streaming server is not received for a certain period of time without accepting the operation, a process for transmitting the connection disconnection request to the streaming server using the terminal communication means is performed. A mobile communication terminal. The mobile communication terminal according to claim 5, wherein
Having timer means for measuring time,
The terminal control means starts time measurement of the timer means when starting the reception / playback process, and restarts time measurement of the timer means each time streaming data transmitted from the streaming server is received, When the elapsed time measured by the timer means reaches the predetermined time, the mobile communication terminal performs processing for transmitting the connection disconnection request to the streaming server using the terminal communication means .

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