JP2015119210A - Information terminal device and portable information terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information terminal device capable of improving communication quality by correcting a displacement of an antenna position.SOLUTION: An information terminal device for performing wireless communication with a portable information terminal comprising detection means for detecting a tilt of an antenna comprises: antenna tilt inquiry means for transmitting an antenna tilt inquiry to the portable information terminal, and receiving information which is transmitted by the portable information terminal in response to the inquiry and shows the tilt of the antenna detected by the detection means; and antenna tilt calculation means for calculating a tilt between the antenna of the portable information terminal and an antenna included in the information terminal device on the basis of the received information showing the tilt of the antenna of the portable information terminal, and obtaining the necessity of antenna tilt correction and a correction amount to be corrected from the calculation. When the antenna tilt correction is necessary, the information terminal device performs the antenna tilt correction by controlling a direction of the antenna included in the information terminal device on the basis of the correction amount.

Description

  The present invention relates to an information terminal device and a portable information terminal that perform wireless data transmission at a short distance.

  The 60 GHz band, which can use a wide band of 9 GHz without requiring a radio license in various countries around the world, has been attracting attention for short-range wireless communication using this, and standardization and practical application as a wireless LAN and wireless PAN method is recommended. It has been. As one of its use forms, contactless high-speed wireless transmission in a form in which a large-sized data file is contactlessly transferred between a portable information terminal and an information kiosk apparatus has been studied.

  As a non-contact data transmission system, an IC card system that uses a short wave band and is used for an automatic ticket gate of a transportation system has been put into practical use. However, when a millimeter wave is used, the wavelength is 1 / compared to those systems. When the position of the portable information terminal is manually adjusted by the user, a shift from the antenna position where high-speed transmission is effective is assumed, and such a shift causes a decrease in communication speed. Non-Patent Document 1 quantitatively shows the influence of the deviation of the antenna position.

Ken HIRAGA et.al. "Analyses of Antenna Displacement in Short-Range MIMO Transmission over Millimeter-Wave" IEICE Transactions Vol.E94-B, No.10, pp.2891-2895 (2011)

  As described above, in a wireless communication system that performs near-field MIMO (multiple-input and multiple-output) transmission using millimeter waves, there is an influence of a shift in the antenna position described in Non-Patent Document 1, In the usage mode in which the user manually aligns, there is a problem that sufficient communication quality cannot be ensured if the antenna is displaced.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an information terminal device and a portable information terminal that can improve the communication quality by correcting the deviation of the antenna position.

  The present invention is an information terminal device that performs wireless communication with a portable information terminal comprising a detecting means for detecting the inclination of the antenna, transmits an inquiry about the inclination of the antenna to the portable information terminal, In response to the inquiry, the antenna inclination inquiry means for receiving information indicating the inclination of the antenna detected by the detection means transmitted by the portable information terminal, and the inclination of the antenna provided in the portable information terminal and the antenna of the portable information terminal, An antenna inclination calculating means is provided for calculating based on the received information indicating the inclination of the antenna and obtaining the necessity of antenna inclination correction and the correction amount to be corrected from the result of the calculation.

  The present invention is characterized by further comprising antenna direction control means for correcting the inclination of the antenna by controlling the direction of the antenna provided on the basis of the correction amount when the antenna inclination correction is necessary. .

  The present invention provides an antenna direction control for correcting the antenna tilt by transmitting the correction amount to the portable information terminal and controlling the antenna direction of the portable information terminal when the antenna tilt correction is necessary. The apparatus further comprises means.

  The present invention is characterized in that the antenna inclination inquiry means inquires about the antenna inclination using a modulation method having a transmission rate smaller than a transmission rate used for data wireless communication.

  In the present invention, the detecting means further detects a rate of change in the inclination of the antenna, and the antenna inclination calculating means predicts the attitude of the portable information terminal based on the information on the speed of the antenna inclination change. A correction amount for performing the antenna inclination correction is obtained.

  The present invention is characterized in that the detecting means is constituted by an acceleration sensor, and an antenna installation surface of the information terminal device is inclined from a horizontal plane.

  The present invention relates to a portable information terminal that performs wireless communication with an information terminal device, the detection means for detecting the inclination of the antenna of the portable information terminal, and information indicating the inclination of the antenna to the information terminal device. Transmitting means for transmitting to the receiving terminal, receiving means for receiving the correction amount of the inclination of the antenna calculated in the information terminal device from the information terminal device, and controlling the direction of the antenna included in the self based on the correction amount. Antenna direction control means for correcting the inclination of the antenna is provided.

  According to the present invention, since the antenna tilt deviation is eliminated and high-speed data is realized, an effect that communication quality can be improved is obtained.

It is a block diagram which shows the structure of the radio | wireless communications system by 1st Embodiment of this invention. It is a figure which shows a state in case the antenna 15 of the information kiosk apparatus 1 and the antenna 23 of the portable information terminal 2 have inclination. 2 is a flowchart showing an operation of the wireless communication system shown in FIG. It is a figure which shows the concept which rotates an antenna. It is a block diagram which shows the structure of the radio | wireless communications system by 3rd Embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless communications system by 4th Embodiment of this invention. It is a flowchart which shows operation | movement of the radio | wireless communications system shown in FIG. It is a block diagram which shows the structure of the radio | wireless communications system by 5th Embodiment of this invention. 9 is a flowchart showing an operation of the wireless communication system shown in FIG. It is explanatory drawing which shows an example of an antenna direction control apparatus. It is explanatory drawing which shows an example of an antenna direction control apparatus.

<First Embodiment>
Hereinafter, a wireless communication system according to a first embodiment of the present invention will be described with reference to the drawings. The wireless communication system includes an information kiosk device and a portable information terminal. Here, the information kiosk apparatus will be described. The information kiosk device is used when a data file is uploaded and loaded from the portable information terminal held by the user to the information kiosk device, or when the data file is downloaded from the information kiosk device to the portable information terminal held by the user. At that time, the portable information terminal and the information kiosk device are arranged close to each other by the user, and short-range wireless communication is performed.

  As described above, when the portable information terminal is brought close to the information kiosk device for communication, the user holds the portable information terminal and brings the antenna of the information kiosk device close to the antenna of the portable information terminal. When the positional relationship required for high-speed transmission is not achieved, the antenna position may shift during communication due to camera shake or the like. The present invention corrects the positional deviation of the antenna to prevent the communication quality from deteriorating.

  FIG. 1 is a block diagram showing a configuration of a wireless communication system according to the first embodiment. In this figure, reference numeral 1 denotes an information kiosk apparatus. Reference numeral 2 denotes a portable information terminal. Reference numeral 11 denotes an antenna installation state correction unit that corrects the antenna installation state. Reference numeral 12 denotes an antenna inquiry unit that inquires the mobile information terminal 2 about the inclination of the antenna. Reference numeral 13 denotes an antenna inclination calculation unit that calculates the inclination of the antenna according to the inquiry result. Reference numeral 14 denotes an antenna inclination correction instruction unit that instructs antenna inclination correction based on the inclination calculation result. Reference numeral 15 denotes an antenna for performing information communication with the portable information terminal 2. Reference numeral 16 denotes an antenna direction control device that controls the direction of the antenna 15 in accordance with an inclination correction instruction.

  Reference numeral 21 denotes an antenna installation state detection unit that detects the antenna installation state in response to the antenna inclination inquiry and returns an answer to the antenna inclination. Reference numeral 22 denotes an acceleration sensor for detecting its own posture state (an antenna installation state). Reference numeral 23 denotes an antenna for performing information communication with the information kiosk apparatus 1 and is an antenna for which an installation state is detected.

  In the configuration of the wireless communication system shown in FIG. 1, when there is a large shift in the polarization direction of the antennas of the portable information terminal 2 and the information kiosk device 1, for example, when the polarization directions are orthogonal, the propagation loss increases and the communication quality Deteriorates significantly. FIG. 2 is a diagram illustrating a state where the antenna 15 of the information kiosk apparatus 1 and the antenna 23 of the portable information terminal 2 are inclined. In FIG. 2, the deviation angle in the polarization direction is represented by θ. As shown in FIG. 2, a state in which communication quality deteriorates occurs according to the deviation angle θ in the polarization direction.

  Next, the operation of the wireless communication system shown in FIG. 1 will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the wireless communication system shown in FIG. First, when the portable information terminal 2 is brought close to the information kiosk device 1, the antenna inclination inquiry unit 12 uses the low-speed communication mode to the antenna installation state detection unit 21 of the portable information terminal 2. An antenna tilt inquiry is transmitted (step S1). In the low-speed communication mode, a modulation method with a low transmission rate (for example, binary amplitude modulation or binary phase modulation) is used so that communication can be performed even when the positional deviation between the antennas is large and the communication path is largely attenuated.

  When receiving the antenna tilt inquiry, the antenna installation state detection unit 21 of the portable information terminal 2 instructs the acceleration sensor 22 to measure the antenna tilt. In response to this, the acceleration sensor 22 measures the inclination of the antenna 23 by measuring the gravitational acceleration (step S2). And the antenna installation state detection part 21 transmits the inclination of the antenna 23 measured by the acceleration sensor 22 with respect to the antenna inclination calculation part 13 (step S3). This antenna tilt answer includes tilt information (three-dimensional tilt information) obtained from the gravitational acceleration direction of the portable information terminal 2. The installation surface of the antenna 15 of the information kiosk device 1 is inclined from the horizontal plane, and the portable information terminal 2 measures the direction of gravity acceleration by the acceleration sensor 22 on the installation surface of the antenna 15 of the information kiosk device 1. For example, since the inclination of the portable information terminal 2 with respect to the direction of gravity can be detected, it becomes possible to obtain the direction of the antenna of the portable information terminal 2.

  Next, the antenna inclination calculation unit 13 of the information kiosk apparatus 1 receives the antenna inclination answer (step S4), and performs antenna inclination calculation (step S5). Here, it is determined whether correction of the antenna direction of the information kiosk device is necessary by using the antenna installation state of the portable information terminal 2 and the information of the antenna installation state of the information kiosk device 1 read from the antenna tilt answer ( In step S6), an angle amount to be further corrected is calculated. In order to determine whether correction is necessary, for example, correction is necessary when θ is larger than a preset threshold value, and correction is not necessary when θ is equal to or smaller than the preset threshold value. to decide.

  Next, when it is determined that the antenna direction of the information kiosk device 1 needs to be corrected, the antenna inclination calculation unit 13 outputs the angle amount obtained by the calculation to the antenna inclination correction instruction unit 14. Subsequently, the antenna inclination correction instruction unit 14 instructs the antenna direction control device 15 to control the direction of the antenna 15 on the information kiosk device 1 side by the angle amount obtained by calculation. In response to this, the antenna direction control device 16 rotates the antenna 15 to correct the tilt (step S7). The correction of the antenna direction may be mechanically rotated and moved, or may be performed electronically by arraying the antenna.

  Next, the information kiosk apparatus 1 and the portable information terminal 2 perform high-speed data transmission. If the antenna inclination calculation unit 13 determines that correction of the antenna direction of the information kiosk apparatus 1 is unnecessary, high-speed data transmission is performed as it is (step S8).

  FIG. 4 is a diagram illustrating the concept of rotating the antenna. As shown in FIG. 4, when there is a deviation in polarization direction by θ, the angle of the antenna 15 of the information kiosk apparatus 1 is rotated by θ to match the same direction as the antenna 23 of the portable information terminal 2. Thereby, high-speed data transmission can be realized without degrading communication quality.

Second Embodiment
Next, a radio communication system according to the second embodiment of the present invention will be described. Since the configuration of the wireless communication system according to the second embodiment is the same as the configuration shown in FIG. 1, detailed description thereof is omitted here. However, some of the functions are different as described below.

  The antenna installation state detection unit 21 included in the portable information terminal 2 detects the position shift direction and speed of the portable information terminal 1 using the acceleration sensor 22 of the portable information terminal 2 and includes the information in the antenna inclination answer. And the antenna inclination calculation part 13 of the information kiosk apparatus 1 predicts the position shift of the portable information terminal 2 in the future, and the antenna inclination correction instruction part 14 implements the antenna inclination correction instruction in advance. With this configuration, the antenna direction control device 16 can be implemented without delay with respect to the positional shift of the portable information terminal 2, and high-speed data transmission can be performed without degrading communication quality.

<Third Embodiment>
Next, a radio communication system according to a third embodiment of the present invention is described. FIG. 5 is a block diagram showing the configuration of the embodiment. In this figure, the same parts as those in the wireless communication system shown in FIG. The wireless communication system shown in this figure is different from the wireless communication system shown in FIG. 1 in that a direction measuring device 24 is provided instead of the acceleration sensor 22.

  The direction measuring device 24 is a device that can measure the direction of a GPS (Global Positioning System) or a compass. In FIG. 1, the attitude of the portable information terminal 2 is specified by the acceleration sensor 22, but the attitude of the portable information terminal 2 is specified by the direction measuring device 24 shown in FIG. 5. In this case, the antenna inclination calculation unit 13 may calculate the antenna inclination using the antenna inclination information obtained by using this direction measuring device. Other processing operations are the same as those shown in FIG. According to this configuration, high-speed data transmission can be realized without degrading the communication quality, similarly to the wireless communication systems of the first embodiment and the second embodiment.

<Fourth embodiment>
Next, a radio communication system according to a fourth embodiment of the present invention is described. FIG. 6 is a block diagram showing the configuration of the embodiment. In this figure, the same parts as those in the wireless communication system shown in FIG. The wireless communication system shown in this figure is different from the wireless communication system shown in FIG. 1 in that an acceleration sensor or direction measuring device 17 and an antenna installation state detection unit 18 are newly provided on the information kiosk device 1 side. is there. The acceleration sensor or direction measuring device 17 has the same function as the acceleration sensor 22 shown in FIG. 1 or the direction measuring device 24 shown in FIG. The antenna installation state detection unit 18 has a function equivalent to that of the antenna installation state detection unit 21 on the portable information terminal 2 side.

  Next, the operation of the wireless communication system shown in FIG. 6 will be described with reference to FIG. FIG. 7 is a flowchart showing the operation of the wireless communication system shown in FIG. In FIG. 7, the same reference numerals are given to the same processing operations as those shown in FIG. First, when the portable information terminal 2 is brought close to the information kiosk device 1, the antenna inclination inquiry unit 12 uses the low-speed communication mode to the antenna installation state detection unit 21 of the portable information terminal 2. An antenna tilt inquiry is transmitted (step S1).

  When receiving the antenna tilt inquiry, the antenna installation state detection unit 21 of the portable information terminal 2 instructs the acceleration sensor 22 to measure the antenna tilt. In response to this, the acceleration sensor 22 measures the inclination of the antenna 23 by measuring the gravitational acceleration (step S2). And the antenna installation state detection part 21 transmits the inclination of the antenna 23 measured by the acceleration sensor 22 with respect to the antenna inclination calculation part 13 (step S3).

  Next, the antenna inclination calculation unit 13 of the information kiosk apparatus 1 receives the antenna inclination answer (step S4). On the other hand, the antenna installation state detector 18 of the information kiosk device 1 instructs the acceleration sensor or the direction measuring device 17 to measure the antenna tilt. In response, the acceleration sensor or direction measuring device 17 measures the inclination of the antenna 23 by measuring the gravitational acceleration or direction. And the antenna installation state detection part 21 outputs the inclination of the antenna 23 measured by the acceleration sensor 22 with respect to the antenna inclination calculation part 13 (step S9).

  Next, the antenna inclination calculation unit 13 calculates the inclinations of the two antennas 15 and 23 based on the outputs of the two antenna installation state detection units 18 and 21 (step S5a). Then, using the information on the antenna installation state of the portable information terminal 2 and the antenna installation state of the information kiosk device 1 read from the antenna tilt answer, it is determined whether or not the antenna direction of the information kiosk device needs to be corrected (step) S6) Further, an angle amount to be corrected is calculated. In order to determine whether correction is necessary, for example, correction is necessary when θ is larger than a preset threshold value, and correction is not necessary when θ is equal to or smaller than the preset threshold value. to decide.

  Next, when it is determined that the antenna direction of the information kiosk device 1 needs to be corrected, the antenna inclination calculation unit 13 outputs the angle amount obtained by the calculation to the antenna inclination correction instruction unit 14. Subsequently, the antenna inclination correction instruction unit 14 instructs the antenna direction control device 15 to control the direction of the antenna 15 on the information kiosk device 1 side by the angle amount obtained by calculation. In response to this, the antenna direction control device 16 rotates the antenna 15 to correct the tilt (step S7).

  Next, the information kiosk apparatus 1 and the portable information terminal 2 perform high-speed data transmission. If the antenna inclination calculation unit 13 determines that correction of the antenna direction of the information kiosk apparatus 1 is unnecessary, high-speed data transmission is performed as it is (step S8).

  As described above, the information kiosk device 1 is also provided with the antenna installation state detection unit 18, and the information sensor kiosk device 1 performs the antenna inclination measurement on the information kiosk device 1 side using the acceleration sensor or the direction measuring device 17, and the portable information terminal By using it for antenna tilt calculation together with information on the antenna tilt response received from 2, it is possible to accurately measure the antenna tilt. If the position or inclination of the information kiosk device 1 is not changed after the information kiosk apparatus 1 is installed, the antenna installation state is detected once immediately after the information kiosk apparatus 1 is installed, and the antenna inclination calculation unit 13 sets the constant. Just remember.

<Fifth Embodiment>
Next, a radio communication system according to a fifth embodiment of the present invention is described. FIG. 8 is a block diagram showing the configuration of the embodiment. In this figure, the same parts as those in the wireless communication system shown in FIG. The wireless communication system shown in this figure is different from the wireless communication system shown in FIG. 1 in that the antenna direction control device 16 on the information kiosk device 1 side is omitted, and an antenna direction control device 25 is newly provided on the portable information terminal 2 side. It is a point. The antenna direction control device 25 has a function equivalent to that of the antenna direction control device 16 shown in FIG.

  Next, the operation of the wireless communication system shown in FIG. 8 will be described with reference to FIG. FIG. 9 is a flowchart showing the operation of the wireless communication system shown in FIG. In FIG. 9, the same processing operations as those shown in FIG. First, when the portable information terminal 2 is brought close to the information kiosk device 1, the antenna inclination inquiry unit 12 uses the low-speed communication mode to the antenna installation state detection unit 21 of the portable information terminal 2. An antenna tilt inquiry is transmitted (step S1).

  When receiving the antenna tilt inquiry, the antenna installation state detection unit 21 of the portable information terminal 2 instructs the acceleration sensor 22 to measure the antenna tilt. In response to this, the acceleration sensor 22 measures the inclination of the antenna 23 by measuring the gravitational acceleration (step S2). And the antenna installation state detection part 21 transmits the inclination of the antenna 23 measured by the acceleration sensor 22 with respect to the antenna inclination calculation part 13 (step S3).

  Next, the antenna inclination calculation unit 13 of the information kiosk apparatus 1 receives the antenna inclination answer (step S4), and performs antenna inclination calculation (step S5). Here, it is determined whether correction of the antenna direction of the information kiosk device is necessary by using the antenna installation state of the portable information terminal 2 and the information of the antenna installation state of the information kiosk device 1 read from the antenna tilt answer ( In step S6), an angle amount to be further corrected is calculated.

  Next, when it is determined that the antenna direction of the information kiosk device 1 needs to be corrected, the antenna inclination calculation unit 13 outputs the angle amount obtained by the calculation to the antenna inclination correction instruction unit 14. Subsequently, the antenna tilt correction instructing unit 14 instructs the antenna direction control device 25 to control the direction of the antenna 23 on the portable information terminal 2 side by the angle amount obtained by calculation (step S7a). In response to this, the antenna direction control device 25 rotates the antenna 23 to correct the inclination (step S7b).

  Next, the information kiosk apparatus 1 and the portable information terminal 2 perform high-speed data transmission. If the antenna inclination calculation unit 13 determines that correction of the antenna direction is unnecessary, high-speed data transmission is performed as it is (step S8).

  As described above, the information kiosk apparatus 1 does not perform the correction of the antenna tilt, and transmits an antenna tilt correction instruction to the portable information terminal 2. The portable information terminal 2 includes the antenna direction control device 25, and the antenna tilt is corrected. Since it correct | amended, the structure of the information kiosk apparatus 1 can be simplified.

  The antenna direction control device 25 may move the antenna 23 of the portable information terminal 2 mechanically or electronically, or displays the direction in which the portable information terminal 2 should be moved on the screen of the portable information terminal 2, An instruction may be given to a user holding the portable information terminal 2 in his / her hand.

  Further, the angle and position of the portable information terminal 2 may be corrected forcibly with an electromagnet or wind pressure. For example, as shown in FIG. 10, the portable information terminal 2 may include a blower 26 and correct the antenna inclination by performing posture control in the manner of rocket injection. Alternatively, as shown in FIG. 11, the information kiosk apparatus 1 is provided with a magnet 19, and there is a magnetic field around it, so that the electromagnet 27 mounted on the portable information terminal 2 works in a direction to correct the antenna tilt. Alternatively, a magnetic field may be generated.

  As described above, since the antenna tilt deviation is detected by the acceleration sensor 22 and the direction measuring device 24 and the antenna position is adjusted according to the deviation, the antenna tilt deviation is eliminated and high-speed data is realized. Communication quality can be improved. This is effective for short-distance MIMO transmission in which the deviation in the polarization direction is corrected and communication quality is improved, and in particular, the phase condition of the transmission path significantly affects the communication quality.

  You may make it implement | achieve the information kiosk apparatus 1 and the portable information terminal 2 in embodiment mentioned above with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in the computer system. It may be realized using hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array).

  As mentioned above, although embodiment of this invention has been described with reference to drawings, the said embodiment is only the illustration of this invention, and it is clear that this invention is not limited to the said embodiment. is there. Therefore, additions, omissions, substitutions, and other modifications of the components may be made without departing from the technical idea and scope of the present invention.

  It can be applied to applications where it is indispensable to improve the communication quality by eliminating the antenna tilt deviation and realizing high-speed data.

  DESCRIPTION OF SYMBOLS 1 ... Information kiosk apparatus (information terminal device), 11 ... Antenna installation state correction | amendment part, 12 ... Antenna inclination calculation part, 14 ... Antenna inclination correction instruction | indication part, 15 ... Antenna, 16 * ..Antenna direction control device, 17 ... acceleration sensor or direction measuring device, 18 ... antenna installation state detection unit, 19 ... magnet, 2 ... portable information terminal, 21 ... antenna installation state detection , 22 ... acceleration sensor, 23 ... antenna, 24 ... direction measuring device, 25 ... antenna direction control device, 26 ... air blower, 27 ... electromagnet

Claims (7)

An information terminal device that performs wireless communication with a portable information terminal that includes detection means for detecting the inclination of an antenna,
Antenna inclination inquiry means for transmitting an inquiry about the inclination of the antenna to the portable information terminal and receiving information indicating the inclination of the antenna detected by the detection means transmitted by the portable information terminal in response to the inquiry When,
The inclination of the antenna of the mobile information terminal and the antenna of the portable information terminal is calculated based on the received information indicating the inclination of the antenna, and the necessity of antenna inclination correction and the correction amount to be corrected are obtained from the calculation result. An information terminal apparatus comprising: an antenna inclination calculation means. The antenna direction control means according to claim 1, further comprising: an antenna direction control unit configured to control the direction of the antenna included in the antenna based on the correction amount and correct the inclination of the antenna when the antenna inclination correction is necessary. The information terminal device described. When the antenna tilt correction is necessary, the antenna further comprises antenna direction control means for transmitting the correction amount to the portable information terminal and controlling the antenna direction of the portable information terminal to correct the antenna tilt. The information terminal device according to claim 1.   4. The antenna inclination inquiry means inquires about the antenna inclination using a modulation method having a transmission rate smaller than a transmission rate used for data wireless communication. The information terminal device according to item. The detection means further detects the rate of change in tilt of the antenna;
2. The antenna inclination calculating means obtains a correction amount for performing the antenna inclination correction by predicting an attitude of the portable information terminal based on information on a speed of the antenna inclination change. 5. The information terminal device according to any one of 4.   6. The information terminal device according to claim 1, wherein the detection unit includes an acceleration sensor, and an antenna installation surface of the information terminal device has an inclination from a horizontal plane. A portable information terminal that performs wireless communication with an information terminal device,
Detecting means for detecting the inclination of the antenna of the portable information terminal;
Transmitting means for transmitting information indicating the inclination of the antenna to the information terminal device;
Receiving means for receiving from the information terminal device a correction amount of the inclination of the antenna calculated in the information terminal device;
An antenna direction control means for correcting the tilt of the antenna by controlling the direction of the antenna included in the mobile information terminal based on the correction amount.

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