JP5430116B2 - COMMUNICATION SYSTEM, COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM - Google Patents

Description

  The present invention relates to a communication system, a communication device, a communication method, and a program.

  Many mobile devices operate on batteries, and a mechanism for reducing power consumption is incorporated in order to extend the operating time as much as possible. For example, in a mobile phone, the radio unit is not always turned on, but the radio unit is intermittently turned on in accordance with the period of the notification signal of the base station. In addition, the wireless unit is turned on intermittently during periods of low communication frequency even during communication. Thereby, the mobile phone has reduced power consumption.

  In many wireless communication systems such as a wireless local area network (LAN), a notification of transition to the low power consumption mode and confirmation from the other party are received, and then the transition to the low power consumption mode is made (see Patent Document 1). . However, as shown in FIG. 10, there is also known a system that shifts to a sleep state without receiving confirmation from the other party and realizes a low power consumption mode.

  FIG. 10 is a sequence diagram illustrating an example of a mechanism for reducing power consumption by intermittently turning on the wireless unit between the communication device A and the communication device B. When the communication frequency decreases, the communication device A transmits a low power consumption mode shift notification M1001 to the communication device B. Thereafter, the communication device A enters the low power consumption mode. In the low power consumption mode, the sleep state and the active state are switched at regular intervals. In the sleep state, the communication device A reduces the power of the CPU that controls the wireless unit and does not supply power to the wireless unit. On the other hand, in the active state, the communication device A operates with normal power. Therefore, the communication device A can communicate with the communication device B in the active state, but the communication device A cannot communicate with the communication device B in the sleep state. In the low power consumption mode, when it is desired to transmit data from the communication device A to the communication device B, the communication device A holds the data until it becomes active, and when it becomes active, Send data.

Further, when receiving the low power consumption mode transition notification M1001 from the communication device A, the communication device B recognizes that the communication device A has entered the low power consumption state. The communication device B recognizes the cycle between the sleep state and the active state of the communication device A. Therefore, when the communication device B wants to transmit data to the communication device A, the communication device B transmits data during a period in which the communication device A is in an active state.
JP 2006-093788 A

  However, problems still remain with the conventional technology. For example, if the communication device B cannot receive the low power consumption mode transition notification M1001 from the communication device A for some reason, it cannot recognize that the communication device A has entered the low power consumption mode. In that case, there is a possibility that the communication device A will transmit data during the period of the sleep state, and communication between both devices may not be established.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication system, a communication device, a communication method, and a program that suppress communication errors that occur during communication after transition to the low power consumption mode. To do.

In order to achieve the above object, one embodiment of the present invention is a communication system including a first communication device and a second communication device, wherein the first communication device includes a first state and the second state. Control means for controlling a first mode that operates by switching between a second state that consumes less power than the first state, and a second mode that operates in the first state; A first transmission means for transmitting a notification indicating operation in a mode to the second communication device when shifting from the second mode to the first mode; and a receiving means for said that you operate in one mode the second communication device receives the information indicating that the recognition from the second communication device, after transmission of the notification by the first transmission means received had no case of the information by the receiving means, said first motor To when switching from Oite said second state to said first state, a notification indicating that the operation before Symbol first mode so as to transmit to the second communication device, the first When the information is received by the receiving means after the notification is transmitted by the transmitting means, the first state is changed when the second state is switched to the first state in the first mode. And a second transmission means for preventing the notification indicating that the operation is performed in the second communication device from being transmitted to the second communication device, and the second communication device, when receiving the notification, The information processing apparatus further comprises means for transmitting information to the first communication device at a timing when the first communication device is operating in the first state.

One embodiment of the present invention is a communication device, which is a communication device, and operates by switching between a first state and a second state that consumes less power than the first state. And a control means for controlling the second mode operating in the first state, and a notification indicating that the operation is performed in the first mode is transferred from the second mode to the first mode. first transmitting means and said other communication equipment information indicating that the communication device is recognized by the other communication devices that you operate in the first mode for transmitting to the other communication devices when receiving means for receiving from the said case receiving information have no by the said receiving means after the transmission of the notification by the first transmitting means, from said first mode to Oite the second state the when switched to the first state, before Symbol operation child in the first mode Was a notification indicating to be transmitted to the other communication device, when said by there is reception of the information the receiver after transmission of the notification by the first transmission means, said in the first mode when switching from the second state to said first state, that a notification indicating that operate in the first mode comprises a second transmission means it does not transmit to the other communication devices Features.

One embodiment of the present invention includes a first mode that operates by switching between a first state and a second state that consumes less power than the first state, and a second mode that operates in the first state. A notification indicating that the device operates in the first mode when the mode is shifted from the second mode to the first mode. a first transmission step of a receiving step of said communication device receives information indicating that the first said other communication equipment that you operate in a mode of recognizes from the other communication device, wherein wherein when reception of the information in the reception process have no after the notification of the transmission in the first transmission step, from the first mode to Oite the second state when the switch to the first state , said notification indicating that operate before Symbol first mode So as to transmit the to the communication device, wherein when the there is reception of the information in the reception step after the transmission of the notification in the first transmission step, said from said second state in said first mode When switching to the first state, it includes a second transmission step for preventing a notification indicating that the operation is performed in the first mode from being transmitted to the other communication device .

A program according to an aspect of the present invention operates in a first mode that operates by switching between a first state and a second state that consumes less power than the first state, and the first state. A control means for controlling the second mode; a first for transmitting a notification indicating operation in the first mode to another communication device when shifting from the second mode to the first mode; transmitting means, said receiving means communicating device receives information indicating that the other communication devices that you operate in the first mode has been recognized from the other communication device, the first transmission means wherein when reception of the information by the reception means have no after transmission of the notification by, when switching from said Oite the second state to the first mode in the first state, before Symbol first Notification indicating that it operates in the mode of the other communication So as to transmit to the vessel, when said by there is reception of the information the first said receiving means after the transmission of the notification by transmitting means, said first from said second state in said first mode When the state is switched to the state, the second function is made to function as a second transmission unit that prevents the notification indicating the operation in the first mode from being transmitted to the other communication device .

According to the present invention, the communication device operates in the first mode in which the communication device operates by switching between the first state and the second state in which the power consumption is lower than that in the first state, as compared with the case without this configuration. it can recognize the other communication devices to. Thereby, the communication error which arises at the time of the communication after 1st mode transfer can be suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a communication system, a communication device, a communication method, and a program according to the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 is a diagram showing an example of a configuration of a communication system according to an embodiment of the present invention.

  The communication system includes a mobile terminal 101 that functions as a first communication device, a proximity wireless communication adapter 102 that functions as a second communication device, and a display 104. Here, the mobile terminal 101 and the close proximity wireless communication adapter 102 are connected by close proximity wireless communication 103, for example. The proximity wireless communication 103 includes, for example, contactless IC card wireless communication using electromagnetic induction, NFC (Near Field Communication), communication using an induction electric field, and the like.

  The display 104 communicates with the mobile terminal 101 via the proximity wireless communication adapter 102. The display 104 and the proximity wireless communication adapter 102 are connected by an adapter cable 105.

  The mobile terminal 101 has a normal mode and a low power consumption mode as operation modes. In the low power consumption mode, power consumption is reduced as compared with the normal mode. Specifically, in the low power consumption mode, the sleep state and the active state are periodically switched. In the sleep state, for example, the mobile terminal 101 operates the CPU clock at a low speed, and stops the supply of power to the wireless unit (a proximity wireless communication unit 202 described later). On the other hand, in the active state, for example, it operates with normal power so that data can be transmitted and received.

  FIG. 2 is a diagram illustrating an example of a functional configuration of the mobile terminal 101 and the proximity wireless communication adapter 102 illustrated in FIG.

  A mobile terminal control unit 201 controls the mobile terminal 101. The mobile terminal control unit 201 includes, for example, a CPU and a memory. Various operations in the mobile terminal 101 are performed by the CPU executing a program stored in the memory.

  Reference numeral 202 denotes a close proximity wireless communication unit, which performs close proximity wireless communication 103. A mode storage unit 203 stores information indicating the mode of the mobile terminal 101 (in this embodiment, the normal mode and the low power consumption mode).

  A transition notification transmission unit 204 transmits a low power consumption mode transition notification M501 indicating the transition to the low power consumption mode to the close proximity wireless communication adapter 102. This notification is transmitted to the near field communication adapter 102 via the near field communication unit 202. Reference numeral 205 denotes a close proximity wireless communication control unit that controls the close proximity wireless communication unit 202.

  Reference numeral 206 denotes a low power consumption mode control unit, which performs control in the low power consumption mode. Reference numeral 207 denotes a sleep control unit that performs control in the sleep state. Reference numeral 208 denotes an active control unit that performs control in the active state. When the mobile terminal 101 is in the sleep state, the sleep control unit 207 operates the CPU clock of the mobile terminal control unit 201 at a low speed, stops the supply of power to the close proximity wireless communication unit 202, or the like. Thereby, the power consumption of the mobile terminal 101 is reduced as compared with that in the active state.

  A state storage unit 209 stores information indicating whether the mobile terminal 101 is in a sleep state or an active state when the mobile terminal 101 is in a low power consumption mode. An interval time storage unit 210 stores an interval time indicating the time (transition time) when the mobile terminal 101 is in the sleep state. The mobile terminal 101 measures the interval time after transition to the sleep state, and transitions to the active state after the interval time has elapsed. In the active state, as described above, it is possible to communicate with a communication partner device (for example, the proximity wireless communication adapter 102) via the proximity wireless communication unit 202. The mobile terminal 101 transitions to the sleep state again after transitioning to the active state for a certain time.

  Reference numeral 211 denotes a close proximity wireless communication adapter control unit that controls the close proximity wireless communication adapter 102. The close proximity wireless transfer adapter controller 211 includes, for example, a CPU and a memory. Various operations in the close proximity wireless transfer adapter 102 are performed by the CPU executing a program stored in the memory.

  A proximity wireless communication unit 212 performs the proximity wireless communication 103. An interface unit 213 communicates with the main body (in the present embodiment, the display 104) via the adapter cable 105.

  Reference numeral 214 denotes a transition confirmation notification transmission unit, which transmits a transition confirmation notification (low power consumption mode transition confirmation notification M502) to the mobile terminal 101 when a low power consumption mode transition notification is received from the mobile terminal 101. . This transition confirmation notification is transmitted to the mobile terminal 101 via the proximity wireless communication unit 212.

  Reference numeral 215 denotes a proximity wireless communication control unit that controls the proximity wireless communication unit 212. Reference numeral 216 denotes an interval time storage unit that stores an interval time indicating the time during which the mobile terminal 101 is in the sleep state. Reference numeral 217 denotes an interface control unit that controls the interface unit 213.

  FIG. 3 is a flowchart showing an example of the operation of the mobile terminal 101 shown in FIG. Here, the operation when the mobile terminal 101 shifts from the normal mode to the low power consumption mode will be described as an example.

  When shifting to the low power consumption mode, the mobile terminal 101 first rewrites information indicating the mode of the mobile terminal 101 in the mode storage unit 203 from the normal mode to the low power consumption mode. Then, the transition notification transmission unit 204 transmits a low power consumption mode transition notification M501 (notification of transition to the sleep state) to the close proximity wireless communication adapter 102 (S302).

  After transmitting the low power consumption mode transition notification M501, the mobile terminal 101 sets the sleep state in the state storage unit 209 and transitions to the sleep state under the control of the sleep control unit 207 (S303).

  When the mobile terminal 101 enters the sleep state, the mobile terminal 101 measures the interval time stored in the interval time storage unit 210. When the interval time elapses (YES in S304), the mobile terminal 101 sets the state storage unit 209 to the active state, and transitions to the active state under the control of the active control unit 208 (S305). In addition, after transitioning to the active state, the mobile terminal 101 transitions to the sleep state again after a predetermined time has elapsed. That is, the mobile terminal 101 repeats the transition to the sleep state and the transition to the active state during the low power consumption mode.

  Here, the mobile terminal 101 that has transitioned to the active state determines whether or not the low power consumption mode transition confirmation notification M502 has been received from the close proximity wireless transfer adapter 102 (S306). As described above, the mobile terminal 101 cannot receive the low power consumption mode transition confirmation notification M502 unless it is in an active state.

  As a result, when the low power consumption mode transition confirmation notification M502 is received (YES in S306), the mobile terminal 101 transitions to the sleep state as it is. If not received (NO in S306), the mobile terminal 101 returns to the process of S302, transmits the low power consumption mode transition notification M501 again, and then transitions to the sleep state.

  FIG. 4 is a flowchart showing an example of the operation of the close proximity wireless transfer adapter 102 shown in FIG. Here, the operation when receiving the low power consumption mode transition notification M501 from the mobile terminal 101 will be described as an example.

  When the proximity wireless communication adapter 102 receives the low power consumption mode transition notification M501 from the mobile terminal 101 (YES in S402), it measures the interval time stored in the interval time storage unit 216. As described above, the interval time stored in the interval time storage unit 216 is time information indicating the time during which the mobile terminal 101 is in the sleep state. By measuring this time, it is possible to synchronize with the mobile terminal 101 and transmit the low power consumption mode transition confirmation notification M502 when the mobile terminal 101 is in the active state.

  Here, when the interval time elapses, the proximity wireless communication adapter 102 transmits a low power consumption mode transition confirmation notification M502 to the mobile terminal 101 in the transition confirmation notification transmission unit 214 (S403).

  Next, a sequence diagram illustrating an example of message transmission / reception between the mobile terminal 101 and the close proximity wireless transfer adapter 102 illustrated in FIG. 1 will be described.

  FIG. 5 shows a sequence when the proximity wireless communication adapter 102 receives the first low power consumption mode transition notification M501 transmitted by the mobile terminal 101. In this case, since the close proximity wireless transfer adapter 102 recognizes immediately after the shift that the mobile terminal 101 has shifted to the low power consumption mode, no particular problem occurs.

  FIG. 6 shows a sequence when the proximity wireless communication adapter 102 cannot receive the first low power consumption mode transition notification M501 transmitted by the mobile terminal 101 for some reason. In this case, the close proximity wireless transfer adapter 102 does not recognize that the mobile terminal 101 has shifted to the low power consumption mode. For this reason, the close proximity wireless transfer adapter 102 may transmit data even though the mobile terminal 101 is in the sleep state. However, since the mobile terminal 101 has not received the low power consumption mode transition confirmation notification M502, it transmits the low power consumption mode transition notification M501 again. Thereby, the close proximity wireless transfer adapter 102 can recognize that the mobile terminal 101 has shifted to the low power consumption mode.

  FIG. 7 shows a sequence when the mobile terminal 101 fails to receive the low power consumption mode transition confirmation notification M502 even after transitioning to the active state a predetermined number of times (in this case, 3 times) after transitioning to the low power consumption mode. ing. In this case, it is conceivable that the communication partner device (for example, the proximity wireless communication adapter 102) is out of the proximity wireless communication range. For this reason, the mobile terminal 101 cancels the low power consumption mode or communication with the communication partner device itself. By using the low power consumption mode transition confirmation notification M502, it is possible to determine the connection state with the communication partner device.

  As described above, in the mobile terminal 101, even if the transition to the active state reaches the predetermined number of times, if the low power consumption mode transition confirmation notification M502 is not received, the low power consumption mode (transition to the sleep state) is canceled. Or determine that communication is not possible and stop communication itself. In this case, the command is not transmitted to the other party that cannot communicate, and wasteful power consumption can be suppressed. In addition, when it is difficult to continue communication, resources can be effectively used to release communication resources.

  As described above, according to the first embodiment, there is a high possibility that the proximity wireless communication adapter 102 can recognize that the mobile terminal 101 has shifted to the low power consumption mode. As a result, communication errors caused by the proximity wireless communication adapter 102 transmitting data while the mobile terminal 101 is in the sleep state can be avoided, so that communication can be reliably performed even in the low power consumption mode.

  Further, the mobile terminal 101 selectively performs whether or not to retransmit the low power consumption mode transition notification M501 depending on whether or not the low power consumption mode transition confirmation notification M502 is received. Therefore, the proximity wireless communication adapter 102 can prevent wasteful re-transmission of the low power consumption mode transition notification M501 although the transition to the low power consumption mode is recognized.

  If the mobile terminal 101 cannot receive the low power consumption mode transition confirmation notification M502 even after repeatedly transitioning to the active state, the low power consumption mode is canceled or the communication itself is stopped. Thereby, useless power consumption can be suppressed.

  Note that interval time information may be included in the low power consumption mode transition notification M501. In this case, even if the proximity wireless communication adapter 102 does not recognize the interval time of the mobile terminal 101 in advance, the above-described processing can be performed. Moreover, when comprised in this way, interval time can also be made variable according to a condition.

(Embodiment 2)
Next, Embodiment 2 will be described. In the second embodiment, a case where two interval times are used will be described. Note that the system configuration and the apparatus configuration according to the second embodiment are the same as those in FIGS. 1 and 2 described in the first embodiment, and a description thereof will be omitted. Here, differences will be described.

  First, the interval time according to the second embodiment will be described.

  The mobile terminal 101 is in the sleep state using the first interval time (interval time T1) until the low power consumption mode transition confirmation notification M502 is sent from the close proximity wireless communication adapter 102 after the transition to the low power consumption mode. And switch between active states. Thereafter, when receiving the low power consumption mode transition confirmation notification M502 from the close proximity wireless communication adapter 102, the mobile terminal 101 switches between the sleep state and the active state using the second interval time (interval time T2).

  Here, different times are set as the interval time T1 and the interval time T2. In the second embodiment, the interval time T2 is set to a normal interval time in the low power consumption mode, and the interval time T1 is set to be shorter than the interval time T2.

  Until the mobile terminal 101 can confirm that the proximity wireless communication adapter 102 recognizes the transition to the low power consumption mode, the low power consumption mode transition notification M501 is sent using the short interval time T1. This is to enable reception early. In addition, when the mobile terminal 101 can confirm that the proximity wireless communication adapter 102 recognizes the shift to the low power consumption mode, the interval is changed to the long interval time T2 to improve the reduction of power consumption. It is.

  FIG. 8 is a flowchart illustrating an example of the operation of the mobile terminal 101 according to the second embodiment. Here, the operation when the mobile terminal 101 shifts from the normal mode to the low power consumption mode will be described as an example.

  When shifting to the low power consumption mode, the mobile terminal 101 first sets the interval time T1 in the interval time storage unit 210 (S801). Thereafter, the mobile terminal 101 rewrites the information indicating the mode of the mobile terminal 101 in the mode storage unit 203 from the normal mode to the low power consumption mode. Then, the transition notification transmission unit 204 transmits a low power consumption mode transition notification M501 to the close proximity wireless communication adapter 102 (S803).

  After transmitting the low power consumption mode transition notification M501, the mobile terminal 101 sets the sleep state in the state storage unit 209 and transitions to the sleep state under the control of the sleep control unit 207 (S804).

  When the mobile terminal 101 enters the sleep state, the mobile terminal 101 measures the interval time T1 stored in the interval time storage unit 210. Then, when the interval time T1 has elapsed (YES in S805), the mobile terminal 101 sets the state storage unit 209 to the active state, and transitions to the active state under the control of the active control unit 208 (S806). In addition, after transitioning to the active state, the mobile terminal 101 transitions to the sleep state again after a predetermined time has elapsed. That is, the mobile terminal 101 repeats the transition to the sleep state and the transition to the active state during the low power consumption mode.

  Here, the mobile terminal 101 that has transitioned to the active state determines whether or not the low power consumption mode transition confirmation notification M502 has been received from the close proximity wireless transfer adapter 102 (S807). As described above, the mobile terminal 101 cannot receive the low power consumption mode transition confirmation notification M502 unless it is in an active state.

  As a result, when the low power consumption mode transition confirmation notification M502 is received (YES in S807), the mobile terminal 101 sets the interval time T2 in the interval time storage unit 210 (S808). Thereafter, the mobile terminal 101 transitions to the sleep state (S809). At this time, the mobile terminal 101 measures the interval time T2 stored in the interval time storage unit 210.

  When the low power consumption mode transition confirmation notification M502 is not received as a result of the processing in S807 (NO in S807), the mobile terminal 101 returns to the processing in S803 and transmits the low power consumption mode transition notification M501 again. After that, transition to the sleep state.

  FIG. 9 is a sequence diagram illustrating an example of message transmission / reception between the mobile terminal 101 and the close proximity wireless transfer adapter 102 according to the second embodiment.

  When the proximity wireless communication adapter 102 receives the low power consumption mode transition notification M501 from the mobile terminal 101, the interval time T1 is stored in the interval time storage unit 216. Then, the proximity wireless communication adapter 102 transmits a low power consumption mode transition confirmation notification M502 to the mobile terminal 101 in the transition confirmation notification transmission section 214 after the interval time T1 stored in the interval time storage section 216 has elapsed. . After transmitting the low power consumption mode transition confirmation notification M502, the close proximity wireless transfer adapter 102 stores the interval time T2 in the interval time storage unit 216 and measures the interval time T2. Thereby, various data are exchanged with the mobile terminal 101 in synchronization with the mobile terminal 101.

  The above is the description of the operation in the mobile terminal 101 according to the second embodiment and an example of the processing sequence between the mobile terminal 101 and the close proximity wireless transfer adapter 102. Note that the detailed operation of the close proximity wireless transfer adapter 102 according to the second embodiment will be omitted.

  As described above, according to the second embodiment, in addition to the effects of the first embodiment, even when the low power consumption mode transition notification M501 cannot be received on the close proximity wireless communication adapter 102 side, recovery can be performed early. Further, when the close proximity wireless communication adapter 102 recognizes that the mobile terminal 101 has shifted to the low power consumption mode, the mobile terminal 101 is long when the mobile terminal 101 can confirm that the mobile terminal 101 has recognized the recognition. Keep sleep using interval time. Thereby, power consumption can be further reduced.

  In the second embodiment, as in the first embodiment, the low power consumption mode transition notification M501 may include information on the interval times T1 and T2. In this case, even if the proximity wireless communication adapter 102 does not recognize the interval time of the mobile terminal 101 in advance, the above-described processing can be performed. Moreover, when comprised in this way, interval time can also be made variable according to a condition.

  Also in the second embodiment, as in the first embodiment, if the mobile terminal 101 cannot receive the low power consumption mode transition confirmation notification M502 even after repeatedly transitioning to the active state, the low power consumption mode is canceled or The communication itself may be stopped.

  The above is an example of a typical embodiment of the present invention, but the present invention is not limited to the embodiment described above and shown in the drawings, and can be appropriately modified and implemented without departing from the scope of the present invention. .

  It should be noted that the present invention can take the form of, for example, a system, apparatus, method, program, or recording medium. Specifically, the present invention may be applied to a system composed of a plurality of devices, or may be applied to an apparatus composed of a single device.

  Further, the present invention achieves the functions of the embodiments by supplying a software program directly or remotely to a system or apparatus, and reading and executing the supplied program code by a computer incorporated in the system or apparatus. This includes cases where In this case, the supplied program is a computer program corresponding to the flowcharts and sequence charts shown in the drawings in the embodiment.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention. In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to an OS (Operating System), or the like.

  Examples of the computer-readable recording medium for supplying the computer program include the following. For example, floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD- R).

  As another program supply method, a browser of a client computer is used to connect to a web page on the Internet, and the computer program of the present invention is downloaded from the web page to a recording medium such as a hard disk. In this case, the downloaded program may be a compressed file including an automatic installation function. It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different web page. That is, the present invention includes a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer.

  Further, the program of the present invention may be encrypted, stored in a recording medium such as a CD-ROM, and distributed to users. In this case, a user who has cleared a predetermined condition is allowed to download key information for decryption from a web page via the Internet, execute a program encrypted using the key information, and install the program on the computer. You can also

  In addition to the functions of the above-described embodiment being realized by the computer executing the read program, the embodiment of the embodiment is implemented in cooperation with an OS or the like running on the computer based on an instruction of the program. A function may be realized. In this case, the OS or the like performs part or all of the actual processing, and the functions of the above-described embodiments are realized by the processing.

  Furthermore, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, so that part or all of the functions of the above-described embodiments are realized. May be. In this case, after a program is written to the function expansion board or function expansion unit, the CPU (Central Processing Unit) provided in the function expansion board or function expansion unit is a part of the actual processing or based on the instructions of the program. Do everything.

It is a figure which shows an example of a structure of the communication system concerning one embodiment of this invention. It is a figure which shows an example of a functional structure in the mobile terminal 101 and the near field communication adapter 102 shown in FIG. 3 is a flowchart illustrating an example of the operation of the mobile terminal 101 illustrated in FIG. 1. 3 is a flowchart showing an example of the operation of the close proximity wireless transfer adapter 102 shown in FIG. 1. FIG. 3 is a first sequence diagram illustrating an example of message transmission / reception between the mobile terminal 101 and the close proximity wireless transfer adapter 102 illustrated in FIG. 1. FIG. 10 is a second sequence diagram illustrating an example of message transmission / reception between the mobile terminal 101 and the close proximity wireless transfer adapter 102 illustrated in FIG. 1. FIG. 10 is a third sequence diagram illustrating an example of message transmission / reception between the mobile terminal 101 and the close proximity wireless transfer adapter 102 illustrated in FIG. 1. 10 is a flowchart illustrating an example of the operation of the mobile terminal 101 according to the second embodiment. FIG. 10 is a sequence diagram illustrating an example of message transmission / reception between the mobile terminal 101 and the close proximity wireless transfer adapter 102 according to the second embodiment. It is a figure for demonstrating an example of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Mobile terminal 102 Proximity wireless communication adapter 104 Display 105 Adapter cable 201 Mobile terminal control part 202, 212 Proximity wireless communication part 203 Mode storage part 204 Transition notification transmission part 205, 215 Proximity wireless communication control part 206 Low power consumption mode control part 207 Sleep control unit 208 Active control unit 209 Status storage unit 210, 216 Interval time storage unit 211 Proximity wireless communication adapter control unit 213 Interface unit 214 Transition confirmation notification transmission unit

Claims (12)

A communication system comprising a first communication device and a second communication device,
The first communication device is:
Control means for controlling a first mode that operates by switching between a first state and a second state that consumes less power than the first state, and a second mode that operates in the first state When,
First transmission means for transmitting a notification indicating operation in the first mode to the second communication device when shifting from the second mode to the first mode;
Receiving means for receiving information indicating that the first communication device and the second communication device that you operate in the first mode has been recognized from the second communication device,
During reception of the information by the receiving means after the transmission of the notification by the first transmission means if have no, switching from the first mode to Oite the second state to the first state to, the receipt of the previous SL notification that operating in the first mode so as to transmit to the second communication device, the information by the receiving means after the transmission of the notification by the first transmission means If there is, when switching from the second state to the first state in the first mode, a notification indicating operation in the first mode is transmitted to the second communication device. Second transmitting means for preventing
The second communication device is:
Means for transmitting the information to the first communication device at a timing at which the first communication device is operating in the first state when the notification is received; Communications system. Communication equipment,
Control means for controlling a first mode that operates by switching between a first state and a second state that consumes less power than the first state, and a second mode that operates in the first state When,
First transmission means for transmitting a notification indicating operation in the first mode to another communication device when shifting from the second mode to the first mode;
Receiving means for receiving information indicating that the communication device is the other communication devices that you operate in the first mode has been recognized from the other communication device,
During reception of the information by the receiving means after the transmission of the notification by the first transmission means if have no, switching from the first mode to Oite the second state to the first state to, a notification indicating that the operation before Symbol first mode so as to transmit to the other communication device, received a of said information by said receiving means after the transmission of the notification by the first transmission means In such a case, when switching from the second state to the first state in the first mode, the notification indicating that the operation is performed in the first mode is not transmitted to the other communication device. a second transmission means for,
A communication device comprising:   The communication device according to claim 2, wherein the second state is a state in which communication with other communication devices is not performed.   4. The communication device according to claim 2, wherein the control unit operates in the second state for an interval time and switches to the first state. The interval time is
Including a first interval time and a second interval time, each having a different time,
The control means includes
The communication apparatus according to claim 4 , wherein the first interval time is used until the information is received, and the second interval time is used after the information is received. 6. The communication apparatus according to claim 4 , wherein the receiving unit receives the information after operating as the second state for at least the interval time after transmission by the transmitting unit.   The communication apparatus according to claim 5, wherein the first interval time is shorter than the second interval time. The communication apparatus according to claim 4 , wherein the notification includes information on the interval time. If the notification is not received even when the switching to the first state reaches a predetermined number of times, the first mode is stopped or the communication connection with the other communication device is disconnected. Item 9. The communication device according to any one of Items 2 to 8. The receiving means receives the information in the first state;
When the second transmission means does not receive the information in the first state, the second transmission unit notifies the other communication device that it operates in the first mode before switching to the second state. The communication device according to claim 2, wherein the communication device transmits the communication device. A communication device having a first mode that operates by switching between a first state and a second state that consumes less power than the first state, and a second mode that operates in the first state A communication method,
A first transmission step of transmitting a notification indicating operation in the first mode to another communication device when shifting from the second mode to the first mode;
A receiving step of said communication device receives information indicating that you operate in the first mode that the other communication devices were recognized from the other communication device,
During reception of the information in the reception step after the transmission of the notification in the first transmission step if have no, switching from the first mode to Oite the second state to the first state to, a notification indicating that the operation before Symbol first mode so as to transmit to the other communication device, the reception of the information in the receiving step is a after transmission of the notification in the first transmission step In such a case, when switching from the second state to the first state in the first mode, the notification indicating that the operation is performed in the first mode is not transmitted to the other communication device. A second transmission step to
A communication method for a communication device, comprising: The computer built in the communication device
Control means for controlling a first mode that operates by switching between a first state and a second state that consumes less power than the first state, and a second mode that operates in the first state ,
First transmission means for transmitting a notification indicating that the operation is performed in the first mode to another communication device when the second mode is shifted to the first mode;
Receiving means for receiving information indicating that the communication device is the other communication devices that you operate in the first mode has been recognized from the other communication device,
During reception of the information by the receiving means after the transmission of the notification by the first transmission means if have no, switching from the first mode to Oite the second state to the first state to, a notification indicating that the operation before Symbol first mode so as to transmit to the other communication device, received a of said information by said receiving means after the transmission of the notification by the first transmission means In such a case, when switching from the second state to the first state in the first mode, the notification indicating that the operation is performed in the first mode is not transmitted to the other communication device. second transmission means for,
Program to function as.

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