JP2014049909A - Portable electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic apparatus that can reduce an unstable communication state.SOLUTION: A mobile phone 1 comprises: a communication unit 15 for performing communication; an acceleration sensor 16 for detecting acceleration; and a control unit 18 for determining whether it is in either a stop state or moving state on the basis of the acceleration detected by the acceleration sensor 16. The control unit 18 controls the communication unit 15 to disconnect communication if it has determined it is in the moving state.

Description

  The present invention relates to a portable electronic device capable of communication.

  Some portable electronic devices communicate using a plurality of communication methods (see, for example, Patent Document 1).

JP 2009-303234 A

  By the way, some of such portable electronic devices communicate by a wireless LAN system. When communication is performed using a wireless LAN system, there is a possibility that the communication state becomes unstable when the mobile electronic device moves and the distance from the base station of the wireless LAN system increases. Such a problem is not limited to communication by a wireless LAN system.

  An object of this invention is to provide the portable electronic device which can reduce an unstable communication state.

  The portable electronic device according to the present invention determines whether a communication unit that performs communication, an acceleration sensor that detects acceleration, and a stopped state or a moving state based on the acceleration detected by the acceleration sensor, A control unit that disconnects the communication when it is determined that the mobile device is in the moving state.

  In the portable electronic device according to the present invention, the communication unit performs communication using a wireless LAN system, and the control unit disconnects communication using the wireless LAN system when it is determined that the mobile unit is in the moving state. Is preferred.

  The portable electronic device according to the present invention further includes a detection unit that detects an electric field strength of a radio wave received from a base station of the wireless LAN system, and the control unit is detected when the mobile unit is determined to be in the moving state. Further, it is preferable that communication by the wireless LAN system is disconnected when the electric field strength is equal to or less than a predetermined threshold.

  The portable electronic device according to the present invention further includes a movement amount calculation unit that calculates a movement amount of the portable electronic device based on the acceleration, and the control unit is calculated by the movement amount calculation unit within a predetermined time. When the amount of movement is greater than or equal to a predetermined value, the threshold value is preferably increased.

  A portable electronic device according to the present invention includes a first communication unit that performs communication using a first communication system, a second communication unit that performs communication using a second communication system, an acceleration sensor that detects acceleration, and the acceleration sensor. And determining whether the moving state is in the stopped state or the moving state based on the acceleration detected by the first communication unit, and determining that the moving state is in the state where communication is performed by the first communication unit. A control unit that switches from communication by one communication unit to communication by the second communication unit.

  In the portable electronic device according to the present invention, it is preferable that the first communication system is a wireless LAN system.

  According to the present invention, an unstable communication state can be reduced.

It is a block diagram which shows the structure of a mobile telephone. It is a figure which shows typically the detection result of an acceleration sensor. It is a flowchart with which it uses for description about the flow of operation | movement of a mobile telephone.

  Embodiments for carrying out the present invention will be described in detail with reference to the drawings. Below, the mobile telephone 1 is demonstrated as an example of an electronic device.

As shown in FIG. 1, the mobile phone 1 includes a display unit 11, an operation unit 12, a receiver 13, a microphone 14, a communication unit 15, an acceleration sensor 16, a storage unit 17, and a control unit 18. Prepare.
The display unit 11 is configured by a display device such as a liquid crystal display (Liquid Crystal Display) or an organic EL panel (Organic Electro-Luminescence panel). The display unit 11 displays characters, images, symbols, graphics, and the like.

The operation unit 12 includes a plurality of buttons and is operated by a user. The operation unit 12 may be configured with a single button.
The receiver 13 converts the sound signal transmitted from the control unit 18 into sound and outputs the sound.

  The communication unit 15 includes an antenna and an RF circuit unit. The communication unit 15 performs communication by a communication method corresponding to each of a plurality of wireless communication standards. The communication unit 15 enables communication by a communication system or a wireless LAN system compliant with cellular phone communication standards such as 2G, 3G, and 4G. In addition, the communication unit 15 enables communication by a wireless communication system that is a wireless LAN system compliant with IEEE 802.11, for example, a wireless communication system of WiFi (registered trademark). The communication unit 15 may perform communication using a WiMAX (registered trademark) wireless communication system. A plurality of antennas and RF circuit units are provided corresponding to a plurality of communication methods. In this embodiment, the communication unit 15 will be described assuming that communication is performed using WiFi. The communication unit 15 includes a first communication unit that performs communication using a first communication system that is a communication system compliant with cellular phone communication standards such as 2G, 3G, and 4G, and a second communication that is a wireless LAN system. A second communication unit that performs communication by the system. The second communication system may be a wireless communication system compliant with IEEE 802.11, a WiMAX wireless communication system, Bluetooth (registered trademark), IrDA, or NFC (Near Field Communication).

  The acceleration sensor 16 detects the direction and magnitude of acceleration acting on the mobile phone 1 and outputs the detection result to the control unit 18. The acceleration sensor 16 is a three-dimensional acceleration sensor that detects acceleration in the X-axis direction, the Y-axis direction, and the Z-axis direction.

  In addition, although the acceleration sensor 16 shall be comprised by a piezoresistive type and an electrostatic capacitance type, for example, it is not restricted to this. For example, the acceleration sensor 16 is a piezoelectric element (piezoelectric type), a thermal detection type MEMS (Micro Electro Mechanical Systems) type, a servo type that moves a moving coil and restores it by a feedback current, or strain caused by acceleration. It may be configured by a strain gauge type or the like that is measured by

  The storage unit 17 is used, for example, for arithmetic processing by the control unit 18 and is configured by a memory or the like. The storage unit 17 stores one or more applications that operate inside the mobile phone 1. The storage unit 17 may also serve as a removable external memory.

  The control unit 18 controls the entire mobile phone 1 and is configured using a central processing unit (CPU) or the like.

Here, processing of the detection result of the acceleration sensor 16 by the control unit 18 will be described.
As shown in FIG. 2, the control unit 18 includes an acceleration in the X-axis direction (A in FIG. 2), an acceleration in the Y-axis direction (B in FIG. 2), and an acceleration in the Z-axis direction (in FIG. 2). C) and a vector value (D in FIG. 2) obtained by combining the accelerations is transmitted as a detection result of the acceleration sensor 16. The control unit 18 logs the combined vector value, analyzes the logged data, and determines the state of the mobile phone 1. The logged data is stored in the storage unit 17.

  When the control unit 18 determines the state of the mobile phone 1, for example, an acceleration pattern stored in advance in the storage unit 17 and associated with each stop state or a plurality of movement states is used. This acceleration pattern is, for example, when the mobile phone 1 is in a stopped state, when a user having the mobile phone 1 is walking, or when riding a bicycle. It is a pattern that has been measured in advance and extracted what kind of acceleration pattern is characteristically detected by the acceleration sensor 16. In the present embodiment, for example, an acceleration pattern corresponding to the logged data of the combined vector value described above is stored in the storage unit 17 in advance for each stop state or a plurality of movement states. The control unit 18 determines the state of the mobile phone 1 by comparing the data logged with the above-described combined vector value with the acceleration pattern.

  The mobile phone 1 according to the present embodiment has a configuration that can reduce the unstable communication state by determining the state of the mobile phone 1. Hereinafter, a configuration for reducing an unstable communication state will be described.

  The control unit 18 functions as a determination unit, and determines whether the mobile phone 1 is in a stopped state or a plurality of moving states based on the acceleration detected by the acceleration sensor 16.

  For example, the control unit 18 determines which state is a first movement state to a fifth movement state, which will be described later, as the plurality of movement states. The stop state is, for example, a state where the mobile phone 1 is placed or a state where it is substantially stopped. The control unit 18 can determine that the vehicle is in a stopped state when no acceleration is detected by the acceleration sensor 16 or when the acceleration detected by the acceleration sensor 16 is very small.

  Subsequently, when the control unit 18 determines that the mobile phone 1 has transitioned from the moving state to the stopped state, the control unit 18 controls the communication unit 15 to search for a base station (access point) corresponding to WiFi. When the base station is found, the control unit 18 establishes a communication connection with the base station.

  When the control unit 18 determines that the mobile phone 1 has transitioned from the stopped state to the moving state after establishing a communication connection with the base station corresponding to WiFi, the control unit 18 controls the communication unit 15 to perform communication by WiFi. Disconnect. Note that disconnecting communication means, for example, disconnecting a wireless link. Here, when the data communication is performed by WiFi (first communication system), the control unit 18 controls the communication unit 15 so that the data communication is performed according to the communication standard (second communication) of the cellular phone. System). That is, the control unit 18 can switch from communication using WiFi (data communication) to communication using a communication system based on the cellular phone communication standard (data communication).

  As described above, the cellular phone 1 disconnects the WiFi communication when the cellular phone 1 transitions from the stopped state to the moving state, so that it is possible to reduce the unstable communication state accompanying the movement of the cellular phone 1. Further, since the communication by WiFi is disconnected when the portable electronic device 1 transitions from the stop state to the movement state, the communication by WiFi can be quickly terminated, and the power consumption can be reduced. In addition, since the cellular phone 1 resumes the data communication by the communication based on the cellular phone communication standard after disconnecting the communication by WiFi, the data communication can be performed in a stable communication state and the convenience can be improved. .

  In addition, the control unit 18 may disconnect the WiFi communication based on the electric field strength. That is, the control unit 18 functions as a detection unit, and controls the communication unit 15 to detect the radio wave intensity of a radio wave received from a WiFi base station to which communication connection is established.

  Then, when the mobile phone 1 transitions from the stop state to the moving state, the control unit 18 controls the communication unit 15 when the radio wave intensity of the radio wave received from the connected base station is equal to or less than a predetermined threshold value. Disconnect communication using WiFi. On the other hand, when the mobile phone 1 transitions from the stopped state to the moving state, the control unit 18 maintains the WiFi communication connection when the radio wave intensity of the radio wave received from the connection destination base station is greater than a predetermined threshold.

  By doing in this way, the mobile phone 1 can cut off the communication by WiFi only when the electric field strength is weak and the communication state is unstable.

  Further, the control unit 18 may disconnect the WiFi communication based on the movement amount of the mobile phone 1. That is, the control unit 18 functions as a movement amount calculation unit, and calculates the movement amount of the mobile phone 1 based on the acceleration detected by the acceleration sensor 16. And the control part 18 may make it raise a predetermined | prescribed threshold value, when the moving amount calculated within the predetermined time is more than predetermined value, when the mobile telephone 1 changes from a stop state to a movement state.

  Thereby, since the predetermined threshold value increases as the mobile phone 1 moves, it is possible to easily disconnect the communication before the mobile phone 1 moves and enters an unstable communication state.

  Next, the operation flow of the mobile phone 1 will be described with reference to the flowchart shown in FIG. In the following embodiment, the state is described as being determined in real time. However, the present invention is not limited to this, and may be performed every predetermined time. Further, the mobile phone 1 starts a predetermined application by a user's operation, starts measuring acceleration according to a measurement start operation, and ends acceleration measurement according to a measurement end operation. However, it is not limited to this. For example, the mobile phone 1 may start measuring acceleration at a start time designated by a timer and end measuring acceleration at an end time.

  In step ST <b> 1, the control unit 18 determines each movement state based on the detection result of the acceleration sensor 16.

  In step ST <b> 2, the control unit 18 determines whether or not the movement state has changed to the stop state. If this determination is YES, the control unit 18 moves the process to step ST3. If this determination is NO, the controller 18 moves the process to step ST1.

In step ST3, the control unit 18 controls the communication unit 15 to search for a base station corresponding to WiFi.
In step ST4, the control unit 18 determines whether or not a base station has been found. When this determination is YES, the control unit 18 moves the process to step ST5. If this determination is NO, the controller 18 moves the process to step ST1.

  In step ST5, the control unit 18 controls the communication unit 15 to establish a communication connection with the base station found by the search.

  In step ST6, the control part 18 discriminate | determines each movement state based on the detection result of the acceleration sensor 16 similarly to step ST1.

  In step ST7, the control part 18 determines whether it changed to the movement state from the stop state. If this determination is YES, the controller 18 moves the process to step ST8. If this determination is NO, the controller 18 moves the process to step ST6.

  In step ST8, the control unit 18 determines whether or not the detected radio wave intensity is equal to or less than a predetermined threshold value. If this determination is YES, the controller 18 moves the process to step ST9. If this determination is NO, the controller 18 moves the process to step ST6.

  In step ST9, the control unit 18 disconnects the communication connection with the base station corresponding to WiFi.

  As described above, according to the present embodiment, the control unit 18 controls the communication unit 15 when determining that the mobile phone 1 has transitioned from the stopped state to the moving state after establishing the communication connection with the base station corresponding to WiFi. Then, the communication by WiFi is disconnected. Subsequently, when the data communication is performed by WiFi, the control unit 18 resumes the data communication by communication according to the cellular phone communication standard.

  Therefore, since the cellular phone 1 disconnects WiFi communication when the cellular phone 1 transitions from the stopped state to the moving state, the unstable communication state associated with the movement of the cellular phone 1 can be reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. Further, the effects of the present invention are not limited to those described in the above embodiment.

  In the above embodiment, it is determined based on the acceleration detected by the acceleration sensor 16 whether the state of the mobile phone 1 is a stopped state or a plurality of moving states, but is not limited thereto. For example, the mobile phone 1 uses GPS (Global Positioning System) to measure the position of the mobile phone 1, and the mobile phone 1 is in a stopped state or a plurality of times from the amount of displacement per unit time (predetermined time) of the mobile phone 1. It may be determined whether it is in a moving state.

DESCRIPTION OF SYMBOLS 1 Mobile phone 15 Communication part 16 Acceleration sensor 18 Control part

Claims (6)

A communication unit for communication;
An acceleration sensor for detecting acceleration;
A control unit that determines whether the state is a stopped state or a moving state based on the acceleration detected by the acceleration sensor, and that determines that the moving state is detected;
A portable electronic device comprising: The communication unit communicates with a wireless LAN system,
The portable electronic device according to claim 1, wherein the control unit disconnects communication by the wireless LAN system when it is determined that the mobile unit is in the moving state. A detector that detects the electric field strength of radio waves received from a base station of the wireless LAN system;
The control unit disconnects communication by the wireless LAN system when the electric field strength detected in the case of determining that the mobile unit is in the moving state is equal to or less than a predetermined threshold;
The portable electronic device according to claim 2. A movement amount calculation unit for calculating a movement amount of the portable electronic device based on the acceleration;
The control unit increases the threshold when the movement amount calculated by the movement amount calculation unit within a predetermined time is a predetermined value or more.
The portable electronic device according to claim 3. A first communication unit that communicates with the first communication system;
A second communication unit that communicates with the second communication system;
An acceleration sensor for detecting acceleration;
Based on the acceleration detected by the acceleration sensor, it is determined whether it is a stop state or a movement state,
A control unit that switches from communication by the first communication unit to communication by the second communication unit when it is determined that the mobile unit is in the moving state in a state of performing communication by the first communication unit;
A portable electronic device comprising: The portable electronic device according to claim 5, wherein the first communication system is a wireless LAN system.

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