JP2000163171A - Communication control method between portable terminal and docking station and portable terminal attachable to docking station - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the power consumption required for wireless communication in a form terminal premised on using a docking station. A terminal device (1) is capable of wireless communication with the outside via an infrared light receiving / emitting unit (17). When the docking station is docked, the power terminal 18
Is supplied with power for operation via the. The change between the dock state and the undock state is determined based on a change in the power supply state via the power supply terminal 18 and based on a power supply event generated by a program stored in the ROM. The infrared communication control program loaded into the main memory is
The infrared communication is not performed in the undock state, but the infrared communication is controlled in the dock state, so that the power consumption in the undock state is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling communication between a portable terminal with a wireless communication function and a docking station assuming the use of a docking station for function expansion, and a portable terminal attachable to the docking station. .

[0002]

2. Description of the Related Art Heretofore, there has been a so-called notebook personal computer which emphasizes portability, which is manufactured on the premise that a function expansion is performed by attaching the function to a docking station. Such a notebook personal computer has an operation unit such as a keyboard and a touch panel and a liquid crystal display (LC) in a minimum configuration required for a computer such as a CPU and a memory.
D) and the like. A drive device that can use a large-capacity recording medium such as a CD-ROM or a floppy disk, a terminal that performs laser communication with the outside, and the like are provided on the docking station side as a resource for function expansion. When the portable terminal is mounted on the docking station, the docking station enters a dock state where power is supplied from the docking station to the portable terminal.

When a portable terminal that can be attached to a docking station is used, the docking station itself is placed in an office or home, and when the portable terminal is used in the office or home, a docking operation for connecting to the docking station is performed. By using the resources of the docking station from a portable terminal, the environment can be the same as that of a so-called desktop personal computer. Further, by performing an undock operation of removing the portable terminal from the docking station, various types of information processing can be performed by the portable terminal alone at a place where the user is going out. For example, when inputting text and collecting data, input operations on the keyboard and touch panel are mainly performed, and operations are performed by effectively using the waiting time in moving transportation or outside. be able to. If the mobile terminal is connected to the docking station to be in the dock state, input text and data can be easily edited, processed, printed, saved, and the like using resources for expanding various functions.

In order to use resources provided in the docking station from a portable terminal, wireless communication using infrared rays as a medium is used. By wirelessly communicating the use of resources between the docking station and the mobile terminal, there is no need to install a connector as in the case of connecting a wired cable, and the mobile terminal can be reduced in size and weight. Is important. Furthermore, if wireless communication is performed using infrared light as a medium, a light emitting diode (LE)
D) and the like, and a light receiving unit such as a phototransistor only need to be provided. Therefore, a portable terminal that needs to be small and lightweight is a particularly suitable method, and a PDA such as a notebook computer is used. Personal Digit
al Assistant), infrared rays are used as a medium between peripheral devices.

[0005] A common problem in portable terminals having an infrared communication function is to reduce the amount of power consumption for extending the time during which power can be supplied while avoiding battery consumption. Prior art related to infrared communication and power consumption reduction is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-081278,
JP-A-9-326800, JP-A-10-2004
No. 79, for example. JP-A-9-0812
No. 78 discloses a control processing device having a wireless interface such as an infrared interface, sensing presence / absence of a device having the same interface around the device, and including control means for controlling power on or off based on the result. Has been described. JP-A-9-326800 discloses that Ir
A wireless communication device that has a wireless infrared interface based on the DA (Infrared Data Association) standard and senses light having the same surrounding interface at a predetermined interval and when a predetermined event occurs is described.
Japanese Patent Application Laid-Open No. Hei 10-200549 discloses a portable information terminal having an infrared interface, dynamically detecting the distance between the terminals, and changing the intensity of the outputted infrared light to an optimum level for communication in accordance with the result. Is described.

[0006]

Although a portable terminal is provided with a battery serving as a power source for carrying and operating the portable terminal, the size and weight of the battery are limited as a result of emphasizing portability. However, long-term operation cannot be continuously performed using only the built-in battery. When docked in the docking station, there is no need to supply the power required for the mobile terminal to operate from the battery built into the mobile terminal, and if such a battery can be charged,
The battery can be charged with the electric power supplied from the docking station. In order to improve the usability of the mobile terminal alone, it is necessary to extend the life of the battery that serves as a power source. It is necessary to reduce it.

In the control processing device described in Japanese Patent Application Laid-Open No. 9-081278, the power is controlled to be turned on or off depending on whether or not a device having the same infrared interface exists around the device. Controlling on or off. As described above, it is not possible to use only the on / off control of the power supply to reduce the power consumption by turning off only the infrared communication function while continuing the information processing. In the wireless communication device described in Japanese Patent Application Laid-Open No. 9-326800, communication is performed in accordance with the IrDA standard in order to increase the repetition period of the procedure of sensing peripheral devices and periodically finding the address of a communication partner. This is realized by performing a procedure for finding the address of the communication partner in accordance with the operation expected to reduce power consumption. However, since the operation of the peripheral device for finding the address of the surrounding communication partner is not stopped, the power consumption is not sufficiently reduced. JP 1
The purpose of the portable information terminal described in Japanese Patent Application Laid-Open No. 0-200549 is to find the optimum infrared intensity for communication, and it is not considered to stop communication. Therefore, if there is a communication partner nearby,
In particular, when the docking station communicates with the docking station in the dock state, the power consumption required for infrared communication can be reduced to the maximum because the distance is short. However, when there is no communication partner in the vicinity in the undock state, the procedure of finding the communication partner is periodically repeated with the maximum radiation intensity, so that power consumption cannot be reduced.

An object of the present invention is to appropriately reduce the power consumption of a wireless communication function between a portable terminal having a wireless communication function on the premise of using a docking station and a docking station, based on the mounting state. It is an object of the present invention to provide a communication control method between a portable terminal and a docking station and a portable terminal that can be attached to the docking station.

[0009]

SUMMARY OF THE INVENTION The present invention provides a portable terminal capable of independently performing information processing operations, a portable terminal which can be mounted by docking operation, and supplies power to the portable terminal in a docking state and expands functions. Wireless communication with a docking station that provides resources for use, the program causing the portable terminal to perform information processing, the docking operation of the docking station and the undocking state by canceling the docking state Upon receiving a power event generated during an undocking operation, wireless communication is started if the mobile terminal immediately before receiving the power event is in the undock state, and wireless communication is stopped if the mobile terminal is in the dock state. It is a communication control method between a terminal and a docking station.

According to the present invention, the portable terminal can independently perform information processing operations, and can be attached to a docking station by a dock operation. In the dock state where the portable terminal is attached to the docking station, power is supplied from the docking station to the portable terminal, and resources for function expansion provided in the docking station are provided. The program that causes the mobile terminal to perform information processing receives a dock operation with the docking station and a power supply event generated during the undocking operation that cancels the dock operation and puts the dock in an undocked state. The wireless communication is controlled accordingly. If the power supply event is in the undock state immediately before receiving the power supply event, the power supply event indicates that the state has shifted to the dock state, and by starting wireless communication, the mobile terminal can use the resources of the docking station. If the state immediately before accepting the power event is the dock state, the occurrence of the power event means an undocking operation, so that wireless communication can be stopped and power consumption can be reduced. Since the start and stop of wireless communication are automatically controlled according to the dock operation and undock operation, power consumption can be automatically reduced without performing an operation for controlling wireless communication on the mobile terminal. Can be planned.

Further, in the present invention, the portable terminal and the docking station display outside that the communication is being performed during the wireless communication.

According to the present invention, during the wireless communication between the portable terminal and the docking station, the fact that the communication is in progress is displayed externally, so that the user of the portable terminal can use the resources provided in the docking station. It is possible to easily know that the operation using is possible, and it is possible to improve the interface for the user's wireless communication.

Further, in the present invention, the wireless communication is performed using light as a medium in accordance with a predetermined standard system.

According to the present invention, since wireless communication is performed using light as a medium in accordance with a predetermined standard system, wireless communication can be performed with another device having a common interface.

The present invention further provides a power supply terminal for receiving power from the docking station when the docking station is attached to the docking station by a docking operation, a wireless communication circuit capable of wirelessly communicating with the docking station, A power supply event generation circuit that detects the start or stop of power supply due to a dock operation to a docking station or an undock operation that cancels a dock state and puts it in an undock state, and generates a power event at the time of detection; And a control circuit that controls the wireless communication circuit to start wireless communication if the state immediately before accepting the power event is undocked and to stop the wireless communication if the state is docked in response to the power supply event. Connectable to docking station featuring It is a mobile terminal.

According to the present invention, if the portable terminal is mounted on the docking station by docking operation, power can be supplied through the power terminal. The wireless communication circuit can perform wireless communication with the docking station. The power event generation circuit detects a dock operation to the docking station or a start or stop of power supply accompanying an undocking operation for canceling the dock state and changing the dock state to the undock state, and generates a power event at the time of the detection. The control circuit responds to the power event from the power event generating circuit, and starts the wireless communication if the state immediately before receiving the power event is the undock state, and stops the wireless communication if the state is the dock state. Therefore, wireless communication is performed only when in the docking state, wireless communication is stopped in the undocking state, and the power consumed by the wireless communication circuit in the undocking state that does not need to use the resources of the docking station is controlled. Can be reduced.

In the present invention, the control circuit controls resources provided in the docking station through radio communication by the communication circuit in the dock state,
In the undock state, the control of the resource is released.

According to the present invention, the control circuit of the portable terminal comprises:
In the dock state, the resources provided in the docking station are controlled via wireless communication by the communication circuit, and the control of the resources is released in the undock state. Therefore, the resources are controlled in the undock state in which the mobile terminal does not use the resources of the docking station. Power consumption required to perform the operation can be reduced.

Further, in the present invention, the control circuit controls the wireless communication of the wireless communication circuit when a predetermined event occurs even in the undock state.

According to the present invention, the control circuit of the portable terminal comprises:
If a predetermined event occurs even in the undock state, the wireless communication circuit controls the wireless communication, so the wireless communication is performed even when the portable terminal is not attached to the docking station, and other similar wireless communication is performed. Control, data communication, and the like can be performed with possible devices.

Further, in the present invention, the wireless communication circuit performs the wireless communication using light as a medium.

According to the present invention, since wireless communication is performed using light as a medium, only a structure for light emission and light reception is provided.
A compact and lightweight wireless communication circuit can be realized.

In the present invention, the light is infrared light. According to the present invention, since wireless communication is performed by infrared rays, communication can be performed without being affected by external visible light.

Further, the present invention is characterized in that it comprises a display for displaying a state of the wireless communication of the wireless communication circuit.

According to the present invention, the state of wireless communication of the wireless communication circuit is displayed at the same time, so that the user of the portable terminal can easily know whether or not wireless communication is available. Thus, a mobile terminal having a wireless communication function can be effectively used.

[0026]

FIG. 1 shows a state in which a portable terminal 1 according to an embodiment of the present invention is about to be mounted on a docking station 2. The mobile terminal 1 is, for example, a notebook computer, and functions are narrowed down with emphasis on portability.
Small and lightweight. However, the mobile terminal 1
Is presumed to be used by attaching it to the docking station 2. When attached to the docking station 2, it can be provided with functions and expandability equal to or more than that of a so-called desktop personal computer. The mobile terminal 1 is provided with an infrared communication unit 3. The docking station 2 is provided with an infrared communication unit 4 and a power terminal unit 5.

FIG. 2 shows a schematic electrical configuration of the portable terminal 1 of FIG. For the bus 10, a CPU 11, which is a central processing unit, a ROM 12, which is a read-only memory,
A main memory 13 including a RAM, an operation unit 14 including a keyboard and a touch panel, a display unit 15 including a liquid crystal display (LCD), and the like are connected to perform basic information processing. it can. The display unit 15 also displays a communication state using infrared rays. The portable terminal 1 is further provided with an infrared communication controller 16 for performing wireless communication with the docking station 2 using infrared as a medium, and an infrared light receiving / emitting unit 17 provided in the infrared communication unit 3 of FIG. The infrared communication controller 16 is connected to the bus 10, and performs control for wireless communication with a docking station or another device having a similar infrared interface via the infrared light receiving / emitting unit 17 under the control of the CPU 11. . The infrared light receiving / emitting section 17 includes a light receiving element such as a phototransistor that receives infrared light, and a light emitting element such as an LED or a laser diode that emits infrared light.

The portable terminal 1 includes a docking station 2
A power supply terminal 18 is provided for receiving power for operation from the docking station 2 in a docking state.
The mobile terminal 1 can operate even in the undock state,
A battery 19 as a power supply is also provided. However, in the portable terminal 1, portability is emphasized, and the size and weight of the battery 19 are preferably as small as possible. However, in the small battery 19, the amount of power that can be supplied to the portable terminal 1 is limited, and the duration as a power source is shortened. In particular,
Of the infrared light receiving and emitting units 17, especially in the light emitting unit, the power consumption when performing communication increases. Therefore, in this embodiment,
In an undock state in which the mobile terminal 1 is not docked at the docking station 2, the infrared communication controller 16 stops the operation of the infrared light receiving / emitting section 17 to reduce power consumption. When the portable terminal 1 is attached to the docking station 2, power can be supplied from the docking station 2 via the power supply terminal 18, so that infrared communication with the infrared light receiving / emitting unit 17 via the infrared communication controller 16 is performed. Even if the control is performed, the power consumption that increases in the infrared light receiving and emitting unit 17 can be supplied from the docking station 2 via the power supply terminal 18 and the consumption of the battery 19 can be avoided.
If the battery 19 is constituted by a rechargeable battery, the portable terminal 1
While docked at docking station 2,
The battery 19 can also be charged with the power supplied from the power supply terminal 18.

FIG. 3 shows the docking station 2 of FIG.
2 shows a schematic electrical configuration of the side. The docking station 2 also has a bus 20, and a power terminal 21, R
The OM 22, CD-ROM drive 23, floppy disk drive 24, network controller 25, and infrared communication controller 26 are connected to each other. The infrared controller 26 is connected to the infrared communication unit 4 of FIG.
Of the infrared receiving / emitting unit 27 provided in the control unit. The external power supply terminal 21 can be connected to, for example, a commercial AC power supply or a DC power supply that rectifies the commercial AC power supply and stabilizes the voltage. The power terminal 2 shown in FIG.
8 is provided, and a power supply terminal 18 of the portable terminal 1 can be connected. The power supply terminal 18 in FIG. 2 and the power supply terminal 28 in FIG. 3 are not actually connected directly to the buses 10 and 20, but are used to detect the state of power supply to the power supply terminals 18 and 28. Outputs of the detection circuit are connected to buses 10 and 20, respectively. The docking station 2 is further provided with a display unit 29 such as an LED. The docking station 2 displays an infrared communication state or the like under the dock state under the control of the CPU 11 of the mobile terminal 1.

FIG. 4 shows an example of a program stored in the main memory 13 of FIG. Infrared communication control program 31
Defines a basic control procedure for performing infrared communication. The infrared communication driver 32 performs settings such as an operation state for the infrared communication controller 16 and directly controls an infrared communication state of the infrared light receiving / emitting unit 17 by the infrared communication controller 16. Such an infrared communication control program 31 and an infrared communication driver 32 can be stored in the ROM 12 in advance as a program. The ROM 12 also includes a basic program that detects the presence or absence of power supply from the docking station 2 to the power supply terminal 18, issues a power supply event when the power supply state changes, and gives it to the infrared communication control program 31. Existing.

FIG. 5 shows the relationship between the docking state and the undocking state between the portable terminal 1 and the docking station 2 shown in FIG. That is, if the undocking operation for detaching the portable terminal from the docking station is performed in the dock state where the portable terminal is attached to the docking station 2, the dock state is canceled and the state shifts to the undock state. In the undock state, the portable terminal 1 can independently perform information processing by the battery 19. When the docking operation for attaching the portable terminal 1 to the docking station 2 is performed with the undock information, the portable terminal 1 shifts to the docking state. In the dock state, the CD-ROM drive 2 which is a resource for function expansion of the docking station 2
3, the floppy disk drive 24, the network controller 25, etc. can be used from the portable terminal 1 side. By performing an undock operation for detaching the docked portable terminal 1 from the docking station 2, the portable terminal 1 does not receive the supply of operating power from the docking station 2. The undock operation causes the ROM 12
The program existing therein generates a power event for the communication control program 31 loaded in the main memory 13.

FIG. 6 is a circuit diagram of the R as a power supply event generating circuit.
An operation procedure as a control circuit by the infrared communication control program 31 that receives a power event from a program in the OM 12 will be described. The infrared communication control program 31
The current state of attachment to the docking station 2 is stored. When a power event is received in step a1, it is determined in step a2 whether the current state of attachment is the dock state. If the current wearing state is the docking state, it is possible to determine that the state shifts to the undocking state by receiving a power supply event, so that the infrared communication stopping process in step a3 is performed. If it is determined in step a2 that the current wearing state is not the docking state, it can be determined that the state shifts to the docking state due to the reception of the power event, so that control is performed so that infrared communication is started in step a4.

FIG. 7 shows a control procedure when an operation such as issuing a “communication start” event is performed from the operation unit 14 of the portable terminal 1 in the undocked state to the infrared communication control program 31. In step b1, the infrared communication control program 31 receives an event from the operation unit 14. In step b2, it is determined whether or not the current mounting state is the dock state. If in dock state,
In step b3, the state is not changed, and the processing is terminated.
That is, in the dock state, communication is performed only with the docking station 2, and communication based on an event from the operation unit 14 is not performed. When it is determined in step b2 that the vehicle is not in the dock state, the type of the event received in step b4 is determined. If the event is "communication start", control for starting infrared communication is performed in step b5. If the event is "communication stopped", step b6
Control for stopping infrared communication. When the event type is not “Communication start” or “Communication stop”,
In step b7, no processing is performed for infrared communication, and the processing ends.

When the infrared communication between the portable terminal 1 and the docking station 2 is performed by, for example, a system in accordance with the IrDA standard, a station discovery phase as shown in step c1 of FIG. 8 is performed at the start of communication. Station discovery is a phase in which a search is performed using infrared light to determine whether there is a device capable of infrared communication in the vicinity. Step c2
A search is performed to find a station, and in step c3, it is determined whether or not the station has been successfully found. If successful, the process proceeds to the actual communication phase in step c4. If it is determined in step c3 that the station has not been successfully found, the process waits for a certain period of time in step c5, returns to step c2, and performs another search for station finding.
In the present embodiment, when the state shifts from the undock to the dock state, the infrared communication is started between the infrared light receiving / emitting section 17 of the portable terminal and the infrared light receiving / emitting section 27 of the docking station 2. In the dock state, the infrared light receiving / emitting unit 17 and the infrared light receiving / emitting unit 27 are arranged at close positions, so that the station can be reliably found in the mutual station finding phase.
It is possible to immediately shift to substantial infrared communication.
Further, in the undock state, it is not necessary to stop the infrared communication and repeat the station finding phase every predetermined time, so that power consumption can be reduced. In the control shown in FIG. 7, in the undock state, infrared communication can be performed by inputting an event from the operation unit 14, so that the portable terminal 1 uses infrared communication between the docking station 2 and another device different from the docking station 2. You can also. When performing infrared communication with another device, a “communication stop” event is issued when the communication ends, and the infrared communication is stopped to reduce power consumption.

In the embodiment described above, wireless communication using infrared rays as a medium is performed in accordance with a standard such as IrDA, but ASK (Amplitude Shift Ke).
Infrared communication may be performed according to other standards such as ying). Further, a portable terminal that is assumed to be used in the docking station 2 can perform wireless communication using visible light as a medium. Since the light emitting unit and the light receiving unit of the portable terminal 1 and the docking station 2 can be brought close to each other, it is possible to prevent visible light from being affected by disturbance light. If wireless communication is performed using visible light, a display for confirming the wireless communication state from outside can also be used. When the portable terminal 1 includes, for example, a bar code reader, the light emitting unit and the light receiving unit of the bar code reader can be used for wireless communication with the docking station. Further, similar to a cordless phone or the like, the portable terminal 1 uses radio waves.
And the docking station 2 can perform wireless communication.

[0036]

As described above, according to the present invention, a portable terminal presuming use of a docking station performs wireless communication with the docking station depending on whether the docking station is in a docking state or an undocking state. Since start or stop can be controlled, wireless communication can be stopped without using the docking station, and power consumption can be reduced.

According to the present invention, during communication using wireless communication, the fact that communication is in progress is displayed to the outside.
The user of the mobile terminal can easily know that the available functions of the mobile terminal are increasing by using wireless communication, and make the mobile terminal easy to use on the premise of using the docking station. Can be.

According to the present invention, the wireless communication function provided by the portable terminal on the premise of using the docking station is performed using light as a medium in accordance with a predetermined standard system. Wireless communication can also be performed with other devices provided.

Further, according to the present invention, when the portable terminal is mounted on the docking station by docking operation, power can be supplied from the docking station via the power terminal. The power supply event generation circuit detects the start or stop of the power supply, and generates a power supply event at the time of the detection.
The transition to the dock state or the undock state can be detected by a power event. The state after the occurrence of the power event is determined by whether the state immediately before the power event is the undock state or the dock state, so that the start or stop of wireless communication by the wireless communication circuit is controlled according to the state immediately before the dock state, and The wireless communication circuit is automatically controlled in response to a docking operation or an undocking operation so that the wireless communication circuit is stopped in the undocking state, and power consumption in the undocking state can be reduced.

According to the present invention, the resources provided in the docking station are controlled by the control circuit of the portable terminal in the dock state, and the control of the resources is released in the undock state. Power consumption can be reduced.

Further, according to the present invention, the portable terminal can use the wireless communication even in the undock state, so that the portable terminal can perform the wireless communication with another device capable of the same wireless communication to transfer data, Control can be performed.

According to the present invention, since wireless communication is performed using light as a medium, the configuration of a wireless communication circuit can be reduced in size and weight.

According to the present invention, since infrared rays are used as light, reliable wireless communication can be performed without being affected by external visible light.

Further, according to the present invention, the state of communication by wireless communication of the wireless communication circuit is displayed on the display device, so that the user of the portable terminal can easily use the wireless communication function.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a docking state in which a docking station 2 mounts a portable terminal 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic electrical configuration of the portable terminal 1 of FIG.

FIG. 3 is a block diagram showing a schematic electrical configuration of the docking station 2 of FIG.

FIG. 4 is a memory map showing an example of a program loaded into a main storage 13 of FIG. 2;

5 is a portable terminal 1 and a docking station 2 shown in FIG.
FIG. 4 is a diagram showing a relationship between a dock state and an undock state between the two.

6 is a flowchart showing a procedure in which the infrared communication control program 31 of FIG. 4 receives a power event and controls infrared communication.

7 is a flowchart showing a procedure in which the infrared communication control program 31 of FIG. 4 receives an event input from the operation unit 14 of FIG. 2 and controls infrared communication.

8 is an infrared communication controller 16 shown in FIG. 2 or FIG. 3;
6 is a flowchart illustrating a control procedure of a station discovery phase performed by the infrared communication controller 26 when starting infrared communication.

[Explanation of symbols]

 Reference Signs List 1 mobile terminal 2 docking station 11 CPU 12, 22 ROM 13 main memory 14 operation unit 15, 29 display unit 16, 26 infrared communication controller 17, 27 infrared light receiving / emitting unit 18, 28 power supply terminal 19 battery 31 infrared communication control program 32 Infrared communication driver

Claims (9)

[Claims] 1. A portable terminal capable of independently performing information processing operation, and a docking station capable of attaching the portable terminal by dock operation, supplying power to the portable terminal in a dock state, and providing a resource for function expansion. A program for causing a portable terminal to perform information processing includes a docking operation of a docking station, and a power supply event generated during an undocking operation for canceling a docking state and setting an undocked state. When the portable terminal immediately before receiving the power event receives the power event, the wireless communication is started if the mobile terminal is in the undock state, and the wireless communication is stopped if the mobile terminal is in the dock state. Communication control method. 2. The communication between the portable terminal and the docking station according to claim 1, wherein the portable terminal and the docking station externally display that the communication is being performed during the wireless communication. Control method. 3. The wireless communication according to claim 1, wherein light is used as a medium in accordance with a predetermined standard method.
Or the communication control method between the portable terminal and the docking station according to 2. 4. A dock terminal attached to the docking station by a docking operation, a power terminal receiving power from the docking station, a wireless communication circuit capable of wireless communication with the docking station, and a docking station. A power supply event generation circuit that detects the start or stop of power supply due to a dock operation or an undock operation that cancels a dock state and puts it into an undock state, and generates a power supply event at the time of detection, and a power supply event from the power supply event generation circuit And a control circuit for controlling a wireless communication circuit to start wireless communication if the state immediately before accepting the power supply event is the undock state, and to stop the wireless communication if the state is the dock state. A mobile terminal that can be connected to a docking station. 5. The control circuit controls the resources provided in the docking station via wireless communication by the communication circuit in the dock state, and releases control of the resources in the undock state. A portable terminal mountable on the docking station according to claim 4. 6. The docking station according to claim 4, wherein the control circuit controls the wireless communication of the wireless communication circuit when a predetermined event occurs even in the undock state. Mobile terminal. 7. The wireless communication circuit according to claim 4, wherein the wireless communication circuit performs the wireless communication using light as a medium.
A mobile terminal attachable to the docking station according to any one of the above. 8. The portable terminal attachable to the docking station according to claim 7, wherein the light is infrared light. 9. The portable terminal attachable to the docking station according to claim 4, further comprising a display for displaying a state of the wireless communication of the wireless communication circuit.