JP2006210993A - Power supply control method and system for mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply control method and system for mobile terminals wherein a communication media section proper to contents data of the mobile terminal can receive the content data and the other communication media section can automatically receive the content data whose reception is interrupted in one communication media section. <P>SOLUTION: The mobile terminal uses a cellular communication media section to receive the HTTP Response from a Web server so as to discriminate whether or not a communication state of the cellular communication media section is suitable for reception of a content size. When the cellular communication media section discriminates that the communication state is not suitable for the reception, the cellular communication media section interrupts the connection and sets a reception interruption flag. When power of the mobile terminal is turned off and the reception interruption flag is set thereafter, power is supplied only to a wireless LAN communication media section. When the wireless LAN communication media section receives a beacon signal thereafter, the mobile terminal turns on the power. Further, the wireless LAN communication media section transmits the HTTP Request to the Web server. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power control method and system for a mobile terminal.

  Conventionally, there is a technique called Magic Packet (registered trademark) (see, for example, Non-Patent Document 1). This is a personal computer (hereinafter referred to as “terminal”) connected to a network, and a terminal (SLEEP mode) in which the main power supply of the main body is turned off is activated by remote operation. Specifically, the remote operation side terminal transmits a specific information packet called a Magic Packet frame to the terminal in the SLEEP mode via Ethernet (registered trademark). The terminal in SLEEP mode that has received this Magic Packet frame automatically turns on the main power supply of the terminal body. A terminal in SLEEP mode that is remotely operated in this way can monitor the reception of a Magic Packet frame, even if the main power of the terminal is turned off, and only the LAN communication media unit is turned on. it can.

  On the other hand, the mobile computing promotion consortium (MCPC: http: //www.mcpc-jp.or) also implements push-type data distribution for mobile terminals. ) Has been studied (for example, see Non-Patent Document 2). It aims to deliver information in real time regardless of the location information of the mobile terminal.

  As a conventional technique, when there is content data to be transmitted to a mobile terminal, the calling server transmits a specific message to the mobile terminal, powers on the mobile terminal body, and an appropriate application is activated (for example, Patent Document 1). reference). Next, the mobile terminal sends a content request message to the calling server. Thereby, real-time push delivery from the calling server to the mobile terminal is realized. At the same time, the mobile terminal need not always wait in the standby state, and the power saving of the terminal is improved. By using a mail function of a mobile phone or a PHS phone to transmit a specific message from the calling server to the mobile terminal, push delivery is possible regardless of the position of the mobile terminal.

  Moreover, there is bit charge as software that enables automatic activation in a single wireless LAN communication media unit (see, for example, Non-Patent Document 3). This detects that the mobile terminal is located within the range of the access point, and activates the application and automatically logs in to the wireless LAN service. In recent years, as a wireless LAN hotspot service, a service for installing a wireless LAN access point in a public area such as a station and connecting to the Internet has been developed. When the mobile terminal is located at a hot spot, content such as news can be automatically distributed using bit charge technology. In order to detect that the mobile terminal is located within the access point, it is necessary to automatically and intermittently start the mobile terminal (hardware) at preset time intervals.

  Further, the mobile terminal can communicate with the Internet regardless of where it is located by providing the cellular communication media unit and the wireless LAN communication media unit. Therefore, when the mobile terminal is located within the access point range, high-speed communication is performed using the wireless LAN communication media unit. Otherwise, relatively low-speed communication is performed using the cellular communication media unit. It can be performed.

“Magic Packet Technology”, [online], [searched on January 16, 2005], Internet <URL: http://www.amd.com/jp-ja/ConnectivitySolutions/ProductInformation/0,,50_2324_2481,00. html> "What is WOR = Wake On Ring that can realize convenient Push technology? Introducing its details", [online], [Search January 16, 2005], Internet <URL: http://www.wince.ne .jp / snap / ceSnapView.asp? PID = 788> "Hands-free wireless LAN", [online], [Search January 16, 2005], Internet <http://www.aicon.co.jp/news/65.html> JP 2003-134666 A

  However, when content data is received through a relatively low-speed communication line using the cellular communication media unit, it is convenient to receive it over a long time unless the content data has to be acquired immediately. Lack. Such content data may then be received when the mobile terminal is located within a wireless LAN area capable of high-speed communication. However, if the mobile terminal is in a power-off state, it is necessary to automatically start the power of the mobile terminal body.

  In order to realize automatic activation by transmitting a Magic Packet frame to a mobile terminal, the Magic Packet frame must be transmitted from the access point to the mobile terminal. Although it is possible to predict the destination access point by using the location information of the mobile terminal, the overhead required for tracking the location of the mobile terminal is large. Further, in order to transmit a Magic Packet frame, an association needs to be established between the mobile terminal and the access point in advance. Of course, by broadcasting the Magic Packet frame, it is possible to start up before establishing the association, but this is not applicable when an encryption function such as WEP is used.

  Also, Wake On Ring (WOR) cannot deliver information according to the location of the mobile terminal. In the bit charge, since it is necessary to start the mobile terminal at a predetermined time interval, there is a problem in power saving of the mobile terminal.

  Therefore, according to the present invention, a mobile terminal having a plurality of communication media units can be received from an appropriate communication media unit according to the content data, and content data whose reception is interrupted in one communication media unit can be received. Another object of the present invention is to provide a power control method and system for a mobile terminal that can be automatically received by the other communication media unit.

According to the present invention, there is provided a power control method for a mobile terminal having first and second communication media units,
A first step of transmitting a content request message to a content distribution server by a first communication media unit;
A second step of receiving a content response message from the content distribution server by the first communication media unit and determining whether or not the communication state of the first communication media unit is appropriate for the content size included in the message; ,
A third step of disconnecting the connection to the content distribution server and setting a reception interruption flag when it is determined that the communication state of the first communication media unit is not suitable;
A fourth step in which the second communication media unit is turned on if the reception interruption flag is set at the same time when the mobile terminal is turned off;
A fifth step in which the mobile terminal is powered on when the second communication media unit receives a synchronization establishment broadcast signal from the base station when the mobile terminal is powered off;
And a sixth step of transmitting a content request message to the content distribution server by the second communication media unit.

According to the present invention, there is also provided a power control method for a mobile terminal in a system having a mobile terminal having first and second communication media units and a proxy server,
A first step in which a mobile terminal transmits a content request message including information on its communication state to the proxy server by the first communication media unit, and the proxy server transmits a content request message to the content distribution server;
A second step in which the proxy server determines whether or not the communication state is suitable for the content size included in the content response message received from the content distribution server;
If the proxy server determines that the communication state of the first communication media unit of the mobile terminal is not suitable, a third step of transmitting a content response message with a reception interruption flag set to the mobile terminal;
A fourth step of holding a reception interruption flag when the mobile terminal receives the content response message;
If the reception interruption flag is set when the mobile terminal is turned off, the fifth step in which the second communication media unit is turned on;
A sixth step in which the mobile terminal is powered on when the second communication media unit receives the synchronization establishment broadcast signal from the base station when the mobile terminal is powered off;
And a seventh step of transmitting the content request message to the proxy server by the second communication media unit.

According to another embodiment of the power control method of the present invention,
The communication state is the transmission speed,
Regarding the second step, it is also preferable that the communication media unit is determined to be unsuitable when the transmission time calculated by dividing the content size by the transmission speed is equal to or longer than a predetermined threshold time.

According to another embodiment of the power control method of the present invention,
The first communication media unit is a cellular communication media unit,
The second communication media unit is a wireless LAN communication media unit,
The synchronization establishment broadcast signal may be a beacon signal.

According to another embodiment of the power control method of the present invention,
The first communication media unit is a first wireless LAN communication media unit,
The second communication media unit is a wireless LAN communication media unit whose transmission speed is higher than that of the first wireless LAN communication media unit,
The synchronization establishment broadcast signal may be a beacon signal.

Furthermore, according to another embodiment of the power control method of the present invention,
The wireless LAN communication media unit holds a registration list of receivable ESSIDs in advance, and determines that the beacon signal has been received when the ESSID included in the beacon signal matches one of the ESSIDs in the registration list. It is also preferable to do.

According to the present invention, a mobile terminal comprising:
First communication media means capable of communicating with the content distribution server;
A second communication media means capable of communicating with the content distribution server and having a broadcast signal recognizing unit for instructing power ON when receiving a synchronization establishment broadcast signal from the base station;
Data transmission / reception means for transmitting a content request message and receiving a content response message to the content distribution server via the first and second communication media means;
Content size determination means for determining whether or not the communication state of the communication media means is suitable for the content size included in the content response message;
When it is determined by the content size determination means that it is not suitable, a reception interruption flag is set and held. When the reception interruption flag is set when the mobile terminal is turned off, the SLEEP mode is output. Application power control means;
When the mobile terminal is turned off and the second communication media means is turned on when the SLEEP mode notification is received, and the broadcast signal recognition unit of the second communication media means is instructed to turn on the power. And a power control means for turning on the mobile terminal.

According to another embodiment of the mobile terminal of the present invention,
The communication state is the transmission speed,
The content size determination means preferably determines that the communication media unit is not suitable when the transmission time calculated by dividing the content size by the transmission speed is equal to or longer than a predetermined threshold time.

Further, according to another embodiment of the mobile terminal of the present invention,
The first communication media means is a cellular communication media means,
The second communication media means is a wireless LAN communication media means,
The synchronization establishment broadcast signal may be a beacon signal.

Further, according to another embodiment of the mobile terminal of the present invention,
The first communication media means is a first wireless LAN communication media means,
The second communication media means is a wireless LAN communication media section having a transmission speed higher than that of the first wireless LAN communication media means.
The synchronization establishment broadcast signal may be a beacon signal.

Furthermore, according to another embodiment of the mobile terminal of the present invention,
The wireless LAN communication media means holds a registration list of receivable ESSIDs in advance, and determines that the beacon signal is received when the ESSID included in the beacon signal matches any one ESSID in the registration list. It is also preferable to do.

According to the present invention,
A system having a mobile terminal and a proxy server and controlling the power supply of the mobile terminal,
The mobile terminal
First communication media means capable of communicating with the content distribution server via a proxy server;
A second communication media means capable of communicating with the content distribution server via the proxy server and having a broadcast signal recognition unit for instructing power ON when receiving a synchronization establishment broadcast signal from the base station;
Data transmission / reception means for transmitting a content request message and receiving a content response message to the proxy server via the first and second communication media means;
Content size determination means for determining whether or not a reception interruption flag included in the content response message is set;
If it is determined by the content size determination means that the reception interruption flag is set, the reception interruption flag is set and held, and the reception interruption flag is set when the mobile terminal is turned off. Application power supply control means for outputting SLEEP mode,
When the SLEEP mode notification is received, the mobile terminal is turned off and the second communication media means is turned on, and the mobile terminal moves when the broadcast signal recognition unit of the second communication media means instructs the power on. Power control means for turning on the terminal,
The proxy server
Holding means for holding communication status information when receiving a content request message including communication status information;
Determining means for determining whether or not the communication state is suitable for the content size when receiving a content response message including the content size;
And a transmission unit that transmits a content response message including a reception interruption flag to the mobile terminal when the determination unit determines that it is not suitable.

According to another embodiment of the system of the present invention,
The communication state is the transmission speed,
The determination means of the proxy server also preferably determines that the communication state is not suitable when the transmission time calculated by dividing the content size by the transmission speed is equal to or longer than a predetermined threshold time.

  According to the present invention, the mobile terminal can receive from the appropriate communication media unit according to the content data, and the content data whose reception is interrupted in one communication media unit is received in the other communication media unit. Can be received automatically. For example, when it takes a long time to receive the content data using the cellular communication media unit, when the mobile terminal moves within the access point range, the content is received in a short time using the wireless LAN communication media unit. Can do.

  In particular, when it is determined that it takes a long time to receive the content data using the cellular communication media unit, according to the present invention, the mobile terminal body is then turned off until it is located within the access point range. Can do. Thereby, it is not necessary to intermittently start the mobile terminal at a predetermined time interval in order to determine whether or not it is located at the access point, which contributes to power saving. In addition, according to the present invention, since automatic activation is triggered by a beacon signal broadcast from an access point, automatic activation can be immediately performed when entering the area of the access point. Furthermore, by registering the ESSID to be activated in advance, it is possible to automatically activate the mobile terminal only in the wireless LAN hotspot for which the user has subscribed to the service, thereby preventing unnecessary activation of the mobile terminal. Can do.

  Hereinafter, the best embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram according to the present invention.

  1 includes a mobile terminal 1, a proxy server 2 and a Web server 3 connected to the Internet, a cellular base station 4 connected to the Internet via a cellular network, and an access point connected to the Internet. And 5. The mobile terminal 1 includes a wireless LAN communication media unit 10 and a cellular communication media unit 11, and can communicate with the cellular base station 4 and the access point 5.

  A proxy server generally has a function of accessing a Web server on behalf of a terminal and a function of caching content data once acquired from the Web server. Therefore, when the proxy server receives the content request message in the already cached content data, the proxy server sends back the cached content data to the terminal without accessing the original Web server. For the terminal, the content data can be acquired quickly, and for the Web server, the load that would have originally been applied to the Web server can be reduced. As a result, the traffic (line usage) of the entire network can be reduced.

  The wireless LAN communication media unit 10 of the mobile terminal 1 includes a data transmission / reception unit 101, a beacon signal recognition unit 102, and a module power supply control unit 103. In addition to the wireless LAN communication media unit 10 and the cellular communication media unit 11, the mobile terminal 1 includes a data transmission / reception unit 12, a content size determination unit 13, a power control unit 14, and an application power control unit 15.

The beacon signal recognition unit 102 of the wireless LAN communication media unit 10 recognizes the beacon signal transmitted from the access point 5 in a broadcast manner. The beacon signal is a signal for informing the surroundings of the ESSID, and is transmitted at regular intervals. The beacon signal recognizing unit 102 according to the present invention holds a wireless LAN ESSID registration list for automatic activation in advance. Usually, the user of the mobile terminal 1 registers the ESSID of the hot spot where the service is registered in advance or the ESSID used at home or office.

  The module power control unit 103 of the wireless LAN communication media unit 10 controls the power supply of the entire wireless LAN communication media unit 10 in accordance with the “ON / OFF / SLEEP” mode notified from the power control unit 14. In particular, in the “SLEEP” mode, only the beacon signal recognition unit 102 is turned “ON”. Thereby, even if the entire mobile terminal 1 is turned off, only the beacon signal broadcast from the access point 5 can be received.

  When the data transmission / reception unit 12 of the mobile terminal 1 can communicate with the access point 5 according to the position of the mobile terminal 1, the data transmission / reception unit 12 transmits / receives data to / from the Web server 3 using the wireless LAN communication media unit 10. Otherwise, the cellular communication media unit 11 is used to transmit / receive data to / from the Web server 3. In particular, when acquiring the content, the data transmitting / receiving unit 12 acquires the content data by transmitting an HTTP Request message to one of the communication media units and receiving the HTTP Response message.

The content size determination unit 13 receives “Content-Length” included in the header of the received HTTP Response message from the data transmission / reception unit 12. Further, the content size determination unit 13 monitors the transmission speed of each communication media unit. Then, according to the following determination formula, it is determined whether or not the transmission speed is suitable for receiving the content of the content size.
Content size [Byte] x 8 [bit] / Transmission speed [bit / sec]> Threshold time T1-> NG
Content size [Byte] x 8 [bit] / Transmission speed [bit / sec] ≤ Threshold time T1-> OK

  When the content size determination unit 13 determines that the transmission speed is not suitable for receiving content of the content size, the data transmission / reception unit 12 and the application power control unit 15 are notified of reception interruption “NG”. . Further, when it is determined that the transmission speed is suitable for receiving the content of the content size, the data transmission / reception unit 12 and the application power supply control unit 15 are notified of the continuation of reception “OK”.

  The data transmission / reception unit 12 of the mobile terminal 1 continues to receive the content data by the HTTP response message when the reception continuation “OK” is notified from the content size determination unit 13. On the other hand, when reception interruption “NG” is notified, the connection for acquiring the content data is disconnected, and reception of the content data is stopped.

  The application power supply control unit 15 monitors power ON / OFF for the mobile terminal 1 by the user and controls the power supply control unit 14. In particular, the application power supply control unit 15 receives a message indicating “continuation of reception” “OK” or reception interruption “NG” from the content size determination unit 13 and retains this information as a reacquisition / retention request. When the reception interruption “NG” is received, the content data is reacquired when communication is possible at a higher transmission speed after the power is turned off.

  The application power supply control unit 15 notifies the power supply control unit 14 of the “ON / OFF / SLEEP” mode. In the “ON” mode, the entire mobile terminal 1 is turned on. In the “OFF” mode, the entire mobile terminal 1 is turned off. In particular, the “SLEEP” mode means that only the beacon signal recognition unit 102 of the wireless LAN communication media unit 10 is turned on, and the other modules of the mobile terminal 1 are turned off.

  Further, the application power supply control unit 15 may receive a power ON instruction from the power supply control unit 14. This case is when the beacon signal recognition unit 102 of the wireless LAN communication media unit 10 detects a beacon signal in the SLEEP mode. According to the present invention, the entire mobile terminal 1 is turned on by receiving a beacon signal.

  The power supply control unit 14 of the mobile terminal 1 controls the power supply of the entire mobile terminal 1 in accordance with an instruction from the application power supply control unit 15. When the “ON / OFF” mode is received from the application power control unit 15, the power is turned on / off for each communication media unit. In particular, when receiving the “SLEEP” mode from the application power supply control unit 15, the power supply control unit 14 instructs the cellular communication media unit 11 to turn off the power, and instructs the wireless LAN communication media unit 10 to “SLEEP”. . Receiving this “SLEEP”, the module power supply control unit 103 of the wireless LAN communication media unit 10 turns on the power of only the beacon signal recognition unit 102 and turns off the other parts.

  FIG. 2 is a first sequence diagram in the present invention.

(S201) It is assumed that the user performs an operation for acquiring specific content data from the Web server 3. At this time, it is assumed that only the cellular communication media unit 11 can communicate with the Web server 3 in the mobile terminal 1. Then, the data transmitting / receiving unit 12 transmits an HTTP Request message for the Web server 3 to the cellular communication media unit 11.
(S202) In the mobile terminal 1, the cellular communication media unit 11 transmits the HTTP Request message to the cellular base station 4 and transmits it to the Web server 3 via the cellular network.

(S203) The Web server 3 returns an HTTP Response message to the mobile terminal 1 in response to the HTTP Request message. At this time, the header of the HTTP Response message includes “Content-Length” indicating the content size. The header part of the HTTP response message is shown below.
HTTP / 1.1 200 OK
Date: Thu, 25 Dec 2003 10:10:50 GMT
Server: Apache
Last-Modified: Mon, 01 Dec 2003 15:08:00 GMT
Accept-Ranges: bytes
Content-Length: 34251290
Keep-Alive: timeout = 15, max = 100
Connection: Keep-Alive
Content-Type: application / octet-stream

(S204) In the mobile terminal 1, the cellular communication media unit 11 transmits the HTTP Response message received from the Web server 3 to the data transmitting / receiving unit 12.
(S205) In the mobile terminal 1, the data transmission / reception unit 12 notifies the content size determination unit 13 of the content size included in the HTTP response message.

(S206) The content size determination unit 13 divides the notified content size by the transmission rate of the cellular communication media unit 11 to calculate the transmission time. The content size determination unit 13 holds a threshold time in advance. For example, when the threshold time is set to 10 minutes, if the calculated transmission time is 10 minutes or more, it is determined that the reception is interrupted “NG”. On the other hand, if the calculated transmission time is less than 10 minutes, it is determined that the reception is continued “OK”.

(S207) When it is determined that reception is continued “OK”, the data transmitting / receiving unit 12 of the mobile terminal 1 continues to receive the HTTP Response message transmitted from the Web server 3.

(S208) On the other hand, when it is determined that reception is interrupted “NG”, the content size determination unit 13 notifies the application power supply control unit 15 of a reception interrupt “NG” flag. In addition, the content size determination unit 13 notifies the data transmission / reception unit 12 of the reception interruption “NG” flag.
(S209) Upon receiving the notification of the reception interruption “NG” flag, the data transmitting / receiving unit 12 disconnects the connection with the Web server 3. Thereby, reception of content data is interrupted.

(S210) The application power supply control unit 15 holds a reception interruption “NG” flag. Then, when the mobile terminal is turned off by an application or by a user operation, the application power supply control unit 15 notifies the power supply control unit 14 of the “SLEEP” mode.
(S211) The power supply control unit 14 notifies the “SLEEP” mode to the wireless LAN communication media unit 10 simultaneously with turning off the power of the entire mobile terminal 1 and the cellular communication media unit. When receiving the “SLEEP” mode, the wireless LAN communication media unit 10 turns on the power of only the beacon signal recognition unit 102 and turns off the power of the other parts. As a result, a SLEEP mode in which only reception of a beacon signal is possible, that is, an operation mode with low power consumption.

  Thereafter, it is assumed that the mobile terminal 1 has moved into a range where communication with the access point 5 is possible.

(S212) The wireless LAN communication media unit 10 of the mobile terminal 1 receives the beacon signal notified from the access point 5. The beacon signal recognizing unit 102 of the wireless LAN communication media unit 10 determines whether or not the ESSID of the received beacon signal matches the ESSID registered in advance in the registration list.
(S213) In the mobile terminal 1, when the ESSID of the received beacon signal matches any one of ESSIDs registered in advance in the registration list, the beacon signal recognition unit 102 instructs the power control unit 14 to turn on the power. To do. Such processing can be realized with exactly the same operation as in the case of receiving the Magic Packet frame, which is the prior art, and starting the power supply.
(S214) The power supply control unit 14 notifies the application power supply control unit 15 of power ON.
(S215) Thereby, the mobile terminal 1 is turned on and activated, and the application is also activated. Further, when the mobile terminal 1 is turned on, all the functions of the wireless LAN communication media unit 10 are enabled.

(S216) The wireless LAN communication media unit 10 of the mobile terminal 1 transmits an association establishment request to the access point 5.
(S217) In response to the association establishment request of the mobile terminal 1, the access point 5 returns a response to the mobile terminal 1 to establish the association. The wireless LAN communication media unit 10 of the mobile terminal 1 that has received the association establishment response notifies the data transmission / reception unit 12 that the association has been established.

(S <b> 218) In response to the notification of association establishment from the wireless LAN communication media unit 10, the data transmission / reception unit 12 of the mobile terminal 1 transmits an HTTP Request message for the Web server 3 to the wireless LAN communication media unit 10. The wireless LAN communication media unit 10 transmits an HTTP request message to the access point 5.
(S219) The access point 5 transmits an HTTP Request message to the Web server 3.
(S220) The Web server 3 returns an HTTP Response message to the access point 5 in response to the HTTP Request message.
(S221) The access point 5 transmits an HTTP Response message to the mobile terminal 1. The wireless LAN communication media unit 10 of the mobile terminal 1 transmits an HTTP response message to the data transmission / reception unit 12.

(S222) In the mobile terminal 1, the data transmission / reception unit 12 notifies the content size determination unit 13 of the content size included in the HTTP response message.

(S223) The content size determination unit 13 calculates the transmission time by dividing the content size by the transmission speed of the wireless LAN communication media unit 10. If the calculated transmission time is less than the threshold time 10 minutes, it is determined that the reception is continued “OK”.

(S224) If it is determined that the reception continues “OK”, the data transmitting / receiving unit 12 of the mobile terminal 1 continues to receive the HTTP Response message transmitted from the Web server 3.

  FIG. 3 is a second sequence diagram in the present invention.

  The second sequence diagram of FIG. 3 is different from the first sequence diagram of FIG. 2 in that the proxy server 2 determines the suitability of communication according to the content size.

(S301) It is assumed that the user performs an operation for acquiring specific content data from the Web server 3. At this time, it is assumed that only the cellular communication media unit 11 can communicate with the Web server 3 in the mobile terminal 1. Then, the data transmitting / receiving unit 12 transmits an HTTP Request message for the Web server 3 to the cellular communication media unit 11.
(S302) In the mobile terminal 1, the cellular communication media unit 11 transmits the HTTP Request message to the cellular base station 4 and transmits it to the Web server 3 via the cellular network. The HTTP Request message includes the transmission speed of the cellular communication media unit 11. The proxy server 2 holds the transmission rate. The header part of the HTTP Request message is shown below.
Hypertext Transfer Protocol
GET http: // xxx / yyy HTTP / 1.1
Accept: image / gif, image / x-xbitmap, image / jpeg, image / pjpeg, * / *
Accept-Language: en
User-Agent: Mozilla / 4.0 (compatible; MSIE 6.0; Windows NT 5.1)
Connection: Keep-Alive
Communication-speed: 2Mbps
Moving-speed: 6km / h

(S303) The Web server 3 returns an HTTP Response message to the proxy server 2 in response to the HTTP Request message. The proxy server 2 acquires the content size included in the HTTP response message. The header part of the HTTP response message is shown below.
HTTP / 1.1 200 OK
Date: Thu, 25 Dec 2003 10:10:50 GMT
Server: Apache
Last-Modified: Mon, 01 Dec 2003 15:08:00 GMT
Accept-Ranges: bytes
Content-Length: 34251290
Keep-Alive: timeout = 15, max = 100
Connection: Keep-Alive
Content-Type: application / octet-stream

(S304) The proxy server 2 calculates the transmission time by dividing the previously held content size by the transmission speed of the mobile terminal 1. The proxy server 2 holds a threshold time in advance. For example, when the threshold time is set to 10 minutes, if the calculated transmission time is 10 minutes or more, it is determined that the reception is interrupted “NG”. On the other hand, if the calculated transmission time is less than 10 minutes, it is determined that the reception is continued “OK”. If it is determined that the reception is interrupted “NG”, the proxy server 2 includes the reception interrupt “NG” flag in the HTTP Response message and transmits the message to the mobile terminal 1.
(S305) The proxy server 2 holds the content size acquired from the HTTP Request message received from the Web server 3.

(S 306) In the mobile terminal 1, the cellular communication media unit 11 that has received the HTTP Response message transmits the HTTP Response message to the data transmitting / receiving unit 12.
(S307) The data transmitting / receiving unit 12 notifies the content size determination unit 13 of the reception interruption “NG” flag included in the HTTP Response message.

(S <b> 308) In the mobile terminal 1, the content size determination unit 13 notifies the application power supply control unit 15 of a reception interruption “NG” flag. In addition, the content size determination unit 13 notifies the data transmission / reception unit 12 of the reception interruption “NG” flag.
(S <b> 309) In the mobile terminal 1, the data transmission / reception unit 12 that has received the notification of the reception interruption “NG” flag disconnects the connection with the Web server 3. Thereby, reception of content data is interrupted.

(S310) The application power supply control unit 15 holds a reception interruption “NG” flag. Then, when the mobile terminal is turned off by an application or by a user operation, the application power supply control unit 15 notifies the power supply control unit 14 of the “SLEEP” mode.
(S311) The power controller 14 notifies the wireless LAN communication media unit 10 of the “SLEEP” mode at the same time as turning off the power of the entire mobile terminal 1 and the cellular communication media unit. When receiving the “SLEEP” mode, the wireless LAN communication media unit 10 turns on the power of only the beacon signal recognition unit 102 and turns off the power of the other parts.

  Thereafter, it is assumed that the mobile terminal 1 has moved into a range where communication with the access point 5 is possible.

(S312) The wireless LAN communication media unit 10 of the mobile terminal 1 receives the beacon signal notified from the access point 5. The beacon signal recognizing unit 102 of the wireless LAN communication media unit 10 determines whether or not the ESSID of the received beacon signal matches the ESSID registered in advance in the registration list.
(S313) If the ESSID of the received beacon signal matches any one of the ESSIDs registered in advance in the registration list, the beacon signal recognition unit 102 instructs the power control unit 14 of the mobile terminal 1 to turn on the power. .
(S314) The power supply control unit 14 notifies the application power supply control unit 15 of power ON.
(S315) Thereby, the mobile terminal 1 is turned on and activated, and the application is also activated. Further, when the mobile terminal 1 is turned on, all the functions of the wireless LAN communication media unit 10 are enabled.

(S316) The wireless LAN communication media unit 10 transmits an association establishment request to the access point 5.
(S317) In response to the association establishment request of the mobile terminal 1, the access point 5 returns a response to the mobile terminal 1 to establish the association. The wireless LAN communication media unit 10 of the mobile terminal 1 that has received the association establishment response notifies the data transmission / reception unit 12 that the association has been established.

(S <b> 318) In the mobile terminal 1, the data transmitting / receiving unit 12 transmits an HTTP Request message for the Web server 3 to the wireless LAN communication media unit 10 in response to the notification of association establishment from the wireless LAN communication media unit 10. The wireless LAN communication media unit 10 transmits an HTTP request message to the access point 5.
(S319) The access point 5 transmits an HTTP Request message to the proxy server 2.

(S320) The proxy server 2 acquires transmission speed information “Communication-speed” included in the HTTP Request message. Then, the proxy server 2 calculates the transmission time by dividing the content size held in S305 by the transmission speed of the mobile terminal 1. For example, if the calculated transmission time is less than the threshold time 10 minutes, it is determined that the reception continues “OK”. Thereafter, the proxy server 2 transmits an HTTP Request message to the Web server 3.
(S321) The Web server 3 returns an HTTP Response message to the proxy server 2 in response to the HTTP Request message. Then, the proxy server 2 transmits the HTTP response message to the mobile terminal 1 via the access point 5.

  According to the embodiment described above, a mobile terminal having a cellular communication media unit and a wireless LAN communication media unit has been described. However, the plurality of communication media units may be based on the same communication method. For example, both media units may be wireless LAN communication media units with different transmission speeds.

  According to the above-described various embodiments of the present invention, those skilled in the art can easily make various changes, modifications, and omissions in the technical idea and scope of the present invention. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

It is a system configuration diagram in the present invention. It is a 1st sequence diagram in this invention. It is a 2nd sequence diagram in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal 10 Wireless LAN communication media part 101 Data transmission / reception part 102 Beacon signal recognition part 103 Module power supply control part 11 Cellular communication media part 12 Data transmission / reception part 13 Content size determination part 14 Power supply control part 15 Application power supply control part 2 Proxy server, Proxy server 3 Web server, content distribution server 4 Cellular base station 5 Access point

Claims (13)

A power supply control method for a mobile terminal having first and second communication media units,
A first step of transmitting a content request message to a content distribution server by the first communication media unit;
A second content response message is received from the content distribution server by the first communication media unit, and a second determination is made as to whether or not the communication state of the first communication media unit is appropriate for the content size included in the message. And the steps
A third step of disconnecting the connection to the content distribution server and setting a reception interruption flag when it is determined that the communication state of the first communication media unit is not suitable;
A fourth step in which the second communication media unit is turned on if the reception interruption flag is set at the same time as the mobile terminal is turned off;
A fifth step in which the mobile terminal is powered on when the second communication media unit receives a synchronization establishment broadcast signal from a base station when the mobile terminal is powered off;
And a sixth step of transmitting the content request message to the content distribution server by the second communication media unit. A power control method for the mobile terminal in a system having a mobile terminal having first and second communication media units and a proxy server,
The mobile terminal transmits a content request message including information on its communication state to the proxy server by the first communication media unit, and the proxy server transmits the content request message to a content distribution server. Steps,
A second step in which the proxy server determines whether or not the communication state is suitable for a content size included in a content response message received from the content distribution server;
A third step of transmitting the content response message with a reception interruption flag set to the mobile terminal when the proxy server determines that the communication state of the first communication media unit of the mobile terminal is not suitable;
A fourth step of holding the reception interruption flag when the mobile terminal receives the content response message;
If the reception interruption flag is set when the mobile terminal is powered off, a fifth step in which the second communication media unit is powered on;
When the mobile terminal is powered off, a sixth step in which the mobile terminal is powered on when the second communication media unit receives a synchronization establishment broadcast signal from a base station;
And a seventh step of transmitting the content request message to the proxy server by the second communication media unit. The communication state is a transmission rate,
In the second step, when the transmission time calculated by dividing the content size by the transmission speed is equal to or longer than a predetermined threshold time, it is determined that the communication media unit is not suitable. The power control method of the mobile terminal according to claim 1 or 2. The first communication media unit is a cellular communication media unit;
The second communication media unit is a wireless LAN communication media unit,
The method for controlling power supply of a mobile terminal according to any one of claims 1 to 3, wherein the synchronization establishment broadcast signal is a beacon signal. The first communication media unit is a first wireless LAN communication media unit;
The second communication media unit is a wireless LAN communication media unit having a transmission speed higher than that of the first wireless LAN communication media unit,
The method for controlling power supply of a mobile terminal according to any one of claims 1 to 3, wherein the synchronization establishment broadcast signal is a beacon signal.   The wireless LAN communication media unit holds a receivable ESSID registration list in advance, and the beacon signal is received when the ESSID included in the beacon signal matches one of the ESSIDs in the registration list. 6. The power control method for a mobile terminal according to any one of claims 1 to 5, wherein the mobile terminal power supply control method is determined. First communication media means capable of communicating with the content distribution server;
Second communication media means capable of communicating with the content distribution server and having a broadcast signal recognizing unit for instructing power ON when receiving a synchronization establishment broadcast signal from a base station;
Data transmission / reception means for transmitting a content request message and receiving a content response message to the content distribution server via the first and second communication media means;
Content size determination means for determining whether or not the communication state of the communication media means is suitable for the content size included in the content response message;
When the content size determination means determines that the reception interruption flag is not suitable, the reception interruption flag is set and held. When the reception interruption flag is set when the mobile terminal is turned off, the SLEEP mode is set. Application power supply control means for outputting,
Upon receiving the notification of the SLEEP mode, the mobile terminal is turned off and the second communication media means is turned on, and the broadcast signal recognition unit of the second communication media means sends the power supply. A mobile terminal comprising power control means for turning on the mobile terminal when instructed to turn it on. The communication state is a transmission rate,
The content size determination unit determines that the communication media unit is not suitable when a transmission time calculated by dividing the content size by the transmission speed is equal to or longer than a predetermined threshold time. Item 8. The mobile terminal according to Item 7. The first communication media means is a cellular communication media means;
The second communication media means is a wireless LAN communication media means,
The mobile terminal according to claim 7 or 8, wherein the synchronization establishment broadcast signal is a beacon signal. The first communication media means is a first wireless LAN communication media means;
The second communication media means is a wireless LAN communication media unit having a transmission speed higher than that of the first wireless LAN communication media means,
The mobile terminal according to claim 7 or 8, wherein the synchronization establishment broadcast signal is a beacon signal.   The wireless LAN communication media means holds a registration list of receivable ESSIDs in advance, and the beacon signal is received when the ESSID included in the beacon signal matches any one of the registration lists. The mobile terminal according to any one of claims 7 to 10, wherein the mobile terminal is determined as having been performed. A system having a mobile terminal and a proxy server and controlling the power supply of the mobile terminal,
The mobile terminal
First communication media means capable of communicating with the content distribution server via the proxy server;
A second communication media means capable of communicating with the content distribution server via the proxy server, and having a broadcast signal recognizing unit for instructing power ON when receiving a synchronization establishment broadcast signal from a base station; ,
Data transmitting / receiving means for transmitting a content request message and receiving a content response message to the proxy server via the first and second communication media means;
Content size determination means for determining whether or not a reception interruption flag included in the content response message is set;
When the content size determination means determines that the reception interruption flag is set, the reception interruption flag is set and held, and when the mobile terminal is turned off, the reception interruption flag is set. Application power supply control means for outputting a SLEEP mode if set;
Upon receiving the notification of the SLEEP mode, the mobile terminal is turned off and the second communication media means is turned on, and the power supply is turned on from the broadcast signal recognition unit of the second communication media means. Power control means for turning on the mobile terminal when instructed,
The proxy server is
Holding means for holding the communication state information when the content request message including the communication state information is received;
Determining means for determining whether the communication state is suitable for the content size when the content response message including the content size is received;
A system for controlling the power supply of a mobile terminal, comprising: a transmission unit that transmits the content response message including a reception interruption flag to the mobile terminal when the determination unit determines that it is not suitable. The communication state is a transmission rate,
The determination unit of the proxy server determines that the communication state is not suitable when a transmission time calculated by dividing the content size by the transmission speed is equal to or longer than a predetermined threshold time. Item 13. The system according to Item 12.

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