JP3513058B2 - Mobile terminal device - Google Patents

Mobile terminal device

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Publication number
JP3513058B2
JP3513058B2 JP28035199A JP28035199A JP3513058B2 JP 3513058 B2 JP3513058 B2 JP 3513058B2 JP 28035199 A JP28035199 A JP 28035199A JP 28035199 A JP28035199 A JP 28035199A JP 3513058 B2 JP3513058 B2 JP 3513058B2
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JP
Japan
Prior art keywords
terminal device
antenna
radio wave
wave propagation
portable terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP28035199A
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Japanese (ja)
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JP2001103002A (en
Inventor
裕樹 庄木
Original Assignee
株式会社東芝
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Filing date
Publication date
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Priority to JP28035199A priority Critical patent/JP3513058B2/en
Publication of JP2001103002A publication Critical patent/JP2001103002A/en
Application granted granted Critical
Publication of JP3513058B2 publication Critical patent/JP3513058B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

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Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to mobile communication and the like.
Related to the mobile terminal device used, especially
Monitor the usage environment and usage status of the terminal with the camera
The present invention relates to a portable terminal device that controls an antenna by using the same. 2. Description of the Related Art Portable terminal devices include mobile phones.
This is a transmitting / receiving terminal for mobile communication. FIG.
2 shows an example of a mobile terminal device. In this portable terminal device, the terminal
The antenna 10 and the housing 12 projecting outside the housing 12
Transmission and reception using an antenna 11 provided inside
ing. At the time of reception, reception of the antennas 10 and 11 is performed.
Select the stronger of the signals and transmit to the receiver
Selection diversity is commonly used. [0003] With such a configuration, a multi
In a fading environment such as a path, the received signal
The level is on the time axis, or the terminal device moves, etc.
Prevents significant deterioration on the spatial axis due to position changes
Communication lines can be prevented from being interrupted.
You. [0004] Generally, radio waves transmitted from a base station are vertically polarized.
Wave, and the vertical polarization component is
Because it is large, the terminal device also receives vertical polarization components
It is desired. However, usually, the terminal device is tilted by hand.
The terminal device itself is tilted because
No, there is only one antenna operating in vertical polarization
In such a case, a polarization loss occurs. In this case
In the configuration of FIG. 15, for example, the antenna 10 is
Diver for polarization and antenna 11 for horizontal polarization
Prevent the received signal from being interrupted by performing Sichi
be able to. As described above, in the conventional portable terminal device,
Means selection diversity by two antennas 10 and 11
Multipath / fading by using the scheme
It is a measure against the environment, and the usage status of the mobile terminal device
Even if (posture) changes, good reception can be performed.
is there. SUMMARY OF THE INVENTION
However, conventional mobile terminal devices have the following problems.
ing. (1) In an environment where an interference wave arrives,
When using selection diversity, interference
Antenna based on received signal strength (received power) including wave
Call quality is not necessarily obtained
Absent. In particular, when the interference wave power is larger,
Disconnection, degradation of call quality, etc. occur. (2) Basically, in transmission, one of the
There is no other way than sending by antenna. When transmitting, the transmission power
The polarization of the wave is the polarization of the other station (generally vertical polarization)
It is desirable to adjust the terminal device
If you are not sure if you are using
Even if there is an antenna corresponding to the polarization component of
The exact decision to use these antennas for transmission is
Can not. (3) What kind of place and how to use the terminal device
In order to maintain communication lines even when
Design and manufacturing including the For example, send
Regarding electric power, we assume
Power is set in advance. However,
When used under normal and favorable conditions,
Setting a large transmission power wastes battery power
And strong radio waves are emitted more than necessary.
Cause interference with other communication areas
There are also problems. [0010] The present invention addresses these problems of the prior art.
This was done to solve the problem.
Antenna control that suppresses waves can be performed,
The optimal polarization control and transmission depending on the usage conditions, usage environment, etc.
To provide a portable terminal device capable of performing transmission power control.
The purpose is to: [0011] The present invention has been made to solve the above-mentioned problems.
Therefore, the present invention includes a camera using a solid-state imaging device or the like.
Originally, in mobile terminal devices,
Photographs a user or other person and stores the image information
Or a camera provided for transmitting to the other party.
Used to detect visual information near the terminal device.
Judge the radio wave propagation environment based on the mobile terminal device, and
Antenna control based on the judgment result
It is characterized by. As described above, the camera is used in the vicinity of the portable terminal device.
Obtain visual information (image information) from the mobile terminal
Estimate the radio wave propagation environment based on the
By controlling the antenna from the results of
Good transmission and reception by setting the
Becomes possible. Visual information (image information) obtained by the camera
The radio propagation environment based on the mobile terminal device from the report
May be performed in the mobile terminal device or described later.
As described above. [0013] A specific method for determining the radio wave propagation environment and its method
Specific contents of antenna control based on the judgment result
The following are examples. (A) Mobile terminal device based on visual information obtained by camera
The position of the device with respect to the ground
It is determined as the propagation environment, and based on the result of this determination,
Changes the polarization of radio waves transmitted or received from the tenor.
With this, it is possible to adjust to the estimated desired polarization.
By controlling the antenna, regardless of the attitude of the mobile terminal,
Transmission or reception of a desired polarization component is always possible. (B) Visual information obtained by a camera
The direction of the communication partner of the mobile terminal device with respect to the mobile terminal device
Radio wave propagation environment, and based on this
Change the directivity of transmitting or receiving from the antenna.
Let As a result, the beam is transmitted in the estimated transmission / reception direction.
Control the antenna so that the
To transmit or receive radio waves from the desired direction.
It becomes possible. (C) Based on the result of determination of the radio wave propagation environment
Then, the power of the radio wave transmitted from the antenna is changed. This
Thereby, based on the estimated transmission power value to be transmitted,
The power value transmitted from the antenna can be changed
You. (D) The antenna has a plurality of antenna elements.
And the excitation amplitude and excitation phase of each of these antenna elements
Can be set by a predetermined excitation control algorithm.
Excitation control based on the judgment result of the radio wave propagation environment.
Try to change the algorithm. Excited like this
The optimal excitation amplitude and excitation phase are estimated by the control algorithm.
By setting this for each antenna element,
Optimized antenna pattern according to radio wave propagation environment
Can be The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
An embodiment will be described. (First Embodiment) FIG. 1 shows a first embodiment of the present invention.
The portable terminal device is shown. Outside the terminal housing 105,
A vertically polarized antenna 101 and a horizontally polarized antenna 102 are provided.
Can be As the vertically polarized antenna 101, a dipole
Using antenna, monopole antenna, rod antenna
Can be As the horizontally polarized antenna 102,
In addition to these linear antennas, inverted F antennas and slot antennas
An antenna or the like can be used. In this embodiment, two
The point is that it can operate with the polarization of
Regardless of the type, and not in an external antenna, but in the housing
It may be built in the unit. On the terminal housing 105, a CCD image is further provided.
Solid-state imaging devices such as image sensors and CMOS image sensors
Consisting of a camera 103 using a child and a liquid crystal display
Display unit 104, operation keys 106 and 107, and
Microphones, speakers, external connection terminals, and the like. Here, the camera 103 displays the image information by the caller.
Is originally set up to obtain the
In this embodiment, the camera 103
Monitor the environment near the terminal device, and
Estimate the radio wave propagation environment based on the terminal
The antennas 101 and 102 based on the determination result.
A feature is that selection control (polarization control) is performed. Rice cake
Camera 103 is used for normal image information acquisition.
Can be used together for monitoring the environment near the terminal device
You. FIG. 2 is a block diagram showing the configuration of this embodiment.
Show. The data acquired by the camera 103
The signal is transmitted to the environment determination unit 108, and the
The judging unit 108 detects the electric power near the terminal device with respect to the terminal device.
The wave propagation environment is determined by estimation, and based on this determination result,
The antenna control unit 109 controls the antenna 101 and the antenna 1
02 is performed. As a result, the antennas 101 and 102
Is transmitted and received in good condition by the transmitting and receiving unit 110 via
Will be. The monitor by the camera 102 communicates
It may be performed at all times or periodically. Conventionally, particularly in a transmission system, the antenna control
In this embodiment,
Is a radio wave propagation ring centered on the terminal device by the camera 103
Judging the environment and performing optimal antenna control based on it
Irrespective of the usage status of the terminal device, etc.
Good communication environment and communication quality can always be maintained. In addition, the camera is a portable terminal device (portable
Information terminals)
In particular, the configuration of the present invention has a particularly high cost.
It is not necessarily to convert to multimedia.
Its value as a wireless terminal is high. Next, specific antenna control and operation will be described.
explain about. In the present embodiment, the vertical polarization antenna
The antenna has a antenna 101 and a horizontally polarized antenna 102.
Controlling the polarization of radio waves transmitted and received by these terminal antennas
It can be performed. Note that the vertical
Polarization and horizontal polarization shall be considered based on the terminal equipment.
You. In this case, first, the terminal device is
Obtain image data in the vicinity of the device and determine the radio wave propagation environment
The signal is transmitted to the
The attitude of the terminal device, that is, the terminal device
The spatial condition in which it is placed, specifically, the terminal device is on the ground
Vertical, horizontal, or
Estimate if it is inclined at an angle. For example, with recent digital signal processing technology,
Due to advances in device technology, image data is
Data acquired by the camera using technology such as pattern recognition
From the image data near the terminal device
Can be estimated in either direction.
It is easy to see how it leans against the direction. Specifically, in an outdoor environment, (a) the sky
Which direction is in the image (for example,
(More recognizable), (b) where you can see when the sun is visible
Or (if the position of the sun is known,
Approximately estimated, and linked to magnetic gyro, clock, etc.
Can be estimated more accurately)
Can estimate the inclination of the terminal device, and (c) building
Objects that are always standing perpendicular to the ground, such as electric poles, telephone poles and cars
By identifying the body by pattern recognition etc., this
Position of the terminal device based on the position and orientation in the images.
You can estimate the state that is being cut. Similarly, indoors
Also identifies the position of the ceiling, the position of the columns, etc. by pattern recognition
By doing so, the position and direction of the terminal device can be estimated. Further, in addition to pattern recognition, motion detection
Can be estimated. That is, communication with the terminal device
While the user trying to walk is walking or in the car
A situation where the background reflected on the camera moves when used
become. In this case, it is implemented by MPEG encoder etc.
Once the motion vector is detected, the
Since the motion is horizontal, the direction of the motion vector is
The image matches the horizontal direction, and the image detected in this way
The position and tilt of the terminal can be detected from the horizontal
Will be. The results of the estimation of the radio wave propagation environment
Of the terminal device with respect to the vertical direction
If it can be output,
Know the direction. For example, to transmit vertically polarized radio waves
In this case, the antenna control unit 109 is
Controls two more differently polarized antennas 101 and 102
And configure a transmitting and receiving antenna suitable for the radio wave propagation environment
It becomes possible. Next, this embodiment will be described with reference to FIGS.
A specific example of the antenna control unit 109 that operates is described. In FIG.
The antenna control unit 109 shown in FIG.
The switch 111 allows the vertically polarized antenna 101
And the horizontally polarized antenna 102 which is closer to the desired polarization.
Is selected. In this case, radio wave propagation
Input from the environment determination unit 108 to the antenna control unit 109
The antenna control signal becomes an antenna switching signal. The antenna control unit 109 shown in FIG.
Check that the polarization transmitted and received by the antenna matches the desired polarization direction.
This is a configuration example in which control is performed so that the
It is constituted by a force distributor 112. Variable power distributor 11
2, antenna control from the radio wave propagation environment determination unit 108
Antenna control signal input to section 109 (in this case,
Based on the distribution ratio signal), and
The power distribution ratio set for the polarization antenna 102 is controlled.
It is. For example, a desired polarization component is transmitted to a terminal device.
If the component is in a direction inclined by 45 °, the vertical polarization
Antenna 101 and the horizontally polarized antenna 102
By exciting in phase, the antenna
Can be operated. Similarly, change the power ratio
Thus, arbitrary polarization can be realized. FIG. 5 shows the structure of FIG. 4 more specifically.
ing. The variable power divider 112 in FIG.
Lid couplers 113 and 114 and variable phase shifters 116 and 11
7 can be realized by connecting them as shown in FIG.
Changing the amount of phase shift set in the phasers 116 and 117
, An arbitrary distribution ratio can be realized. In this case, radio wave propagation
Input from the environment determination unit 108 to the antenna control unit 109
Antenna control signal is actually applied to two variable phase shifters.
The excitation phase signal. Note that the hybrid coupler 1
Do not use one of the 14 ports to avoid unwanted reflections here.
To prevent this, a non-reflective termination 115 is connected. As described above, in this embodiment, the camera 103
From the vertical direction of the terminal device
Detects tilt and operates as a terminal antenna based on this result
By forming the polarization to be caused,
The effect is obtained. (1) When using a terminal device,
It depends on the usage environment.
You. However, according to this embodiment,
Even so, the antenna must always be
The tena can be operated. Therefore, the difference in polarization
Loss can be further reduced and good communication lines can be maintained
it can. Also, since the polarization loss is reduced, transmission
Signal power or receiver performance.
To manufacture the wireless part of the terminal device with inexpensive parts
This is also effective in reducing the cost of the terminal device. (2) Like a personal digital assistant, sometimes like a telephone
In some situations, use it against your ears and mouth, or use it on your desk
One terminal device can be used in various ways
However, in such a case, the configuration of the present embodiment is particularly
It is valid. (3) Transmitting radio waves according to the desired polarization in transmission
To achieve a kind of transmit diversity.
That unnecessary polarized components are not radiated from the antenna
And reduce interference with other wireless base stations and terminal equipment.
Can be made. In addition, the overall amount of interference is thus reduced.
If it can be reduced, the communication capacity, or user capacity, will increase.
Can also be added, which is effective in terms of effective use of radio resources.
There is. Note that the present embodiment is as follows.
The effect of the present invention is the same even if any changes are made. (1) As the polarization of the antenna, the vertical polarization
Although an example using two horizontally polarized antennas has been shown,
The number of antennas may be two or more. For example, antenna
Using three lines, it corresponds to the direction of each axis of the XYZ rectangular coordinate system
It is also possible to prepare an antenna that operates with
No. That is, in the configuration shown in FIG.
Vertically polarized (X-axis polarized) antenna, antenna 102
Since it is a horizontally polarized (y-axis polarized) antenna,
If you prepare an antenna that operates with the polarization component in the Z-axis direction
It will be good. Also, the polarization of each antenna is
It is not necessary to make them orthogonal. (2) The antenna polarization is not linearly polarized.
Operating as a circularly polarized wave, with one of the two antennas
A circularly polarized wave and the other may be a left circularly polarized wave. An example
For example, a system that uses circularly polarized waves in satellite communications, etc.
In many situations, such as outdoors, where satellites can be seen directly
Corresponds to the polarization component actually transmitted and received from the satellite,
In addition, direct waves such as building shadows and indoors are not visible, and
If you are trying to maintain the communication line,
It is considered effective to control so that reverse polarization is added.
Can be (3) In the configuration shown in FIG.
Antennas that operate with
It looks like one antenna, but two polarized waves
May be used. For example, microphone
Separate feed points using a
This makes it possible to form such an antenna.
Wear. (4) Prepare a plurality of cameras, each of which is separate
Image information of the direction of
Process to determine the position and inclination of the terminal device
Is also good. (5) Fix the camera to the terminal housing
Even if a mechanism that can rotate, translate, etc. is provided
good. In this case, the direction the camera is facing is
The position of the terminal device
Try to determine the slope. (6) The camera is driven mechanically and differs
Acquire multiple image data in the direction and process them comprehensively
To determine the position and inclination of the terminal device.
No. (Second Embodiment) FIG. 6 shows a second embodiment of the present invention.
1 shows a mobile terminal device according to an embodiment. This mobile device
The device is, for example, a personal information terminal device or a radio
Sonal computer. End outside terminal housing 120
A plurality of antennas 124, 125, 12
6,127 are provided. In the example of FIG. 6, a four-element antenna
However, the number of antennas does not matter.
Absent. In FIG. 6, a micro strip is used as an antenna.
An example of a flat antenna such as a loop antenna is shown.
An antenna system may be used.
Alternatively, it may be built in the housing. On the terminal housing, a camera 123 and a liquid crystal
Display unit 122 including a display, operation keys
121, etc., microphone, speaker, external connection terminal
The points provided are the same as in the first embodiment. Here, the camera 123 displays the image information
Is originally set up to obtain the
In this embodiment, the camera 123
Monitor the environment in the vicinity of the terminal device.
The radio propagation environment is estimated from the
The feature is to control the directivity of the tena. First fruit
As in the embodiment, the camera 123 is used for normal image information acquisition.
For monitoring and for monitoring the environment near the terminal device
Can be used together. FIG. 7 is a functional block diagram of the present embodiment.
The figure is shown. The data acquired by the camera 123 is
The signal is transmitted to the wave propagation environment determination unit 129, and the
The radio wave propagation environment near the location, and based on this estimation result
The antenna control unit 128 controls the antennas 124, 125, 12
6, 127 are controlled. Thereby, the antenna 12
4,125,126,127 to the transmitting / receiving unit 130
To improve the directivity of transmitted and received radio waves
it can. In the conventional portable terminal device, transmission and reception
Although the directivity control of the antenna could not be performed in
Then, in the present embodiment, the camera 123 is used near the terminal device.
Of the radio wave propagation environment of
And perform optimal antenna control based on the
And always good, regardless of the usage status of the terminal device, etc.
Communication environment and communication quality can be maintained. Next, a specific antenna in this embodiment will be described.
The control will be described. In the second embodiment of FIG.
Therefore, a larger number of antennas 124 and 12 than in the first embodiment are used.
5,126,127, so that
Control of the directivity of the generated radio wave. In this case, first, the terminal device is
Obtain image data in the vicinity of the device and determine the radio wave propagation environment
To the radio wave propagation environment determining unit 128
To be formed on the terminal device by image data
The direction of is estimated. More specifically, for example, a technique such as pattern recognition
Image data near the terminal device acquired by the camera
To find a communication partner station such as a base station and estimate its direction.
Set. In this case, pattern recognition is
The facility of the communication partner station, etc.
Or add a pattern such as a barcode
If it is displayed, the judgment can be made easily. The base station is generally installed outdoors.
However, if the terminal device is used indoors,
Since radio waves should propagate through windows, image data
Windows are extracted and estimated from the data by pattern recognition, etc.
Direction can be determined as the direction the beam should be pointing.
You. Further, the communication partner is a geostationary satellite in satellite communication or the like.
In the case of, as described in the first embodiment,
Approximate satellite direction can be estimated from sky direction
High-accuracy estimation using a clock or magnetic gyro, etc.
It is also possible. The results of the estimation of the radio wave propagation environment
Antenna results to be transmitted and received from the terminal device.
Can detect the direction of the
You can see the directivity that should be. Therefore, it is suitable for the usage environment of the terminal device.
Thus, it is possible to configure a transmitting and receiving antenna. FIG.
9 shows a specific example of the antenna configuration in this case.
You. In the example of FIG. 8, a plurality of antennas 131, 1
32,133,134
Antennas with directivity such that the beam points in different directions
Is used. Then, the antennas 131, 132, 1
Antenna close to the desired beam direction from 33 and 134
Is selected by the switch 135. This place
In this case, the radio wave propagation environment judgment
8 is an antenna switching signal.
No. Note that the beam is directed to the antenna in different directions.
Antenna can be turned mechanically
However, the beam direction may be changed by forming a subarray.
No. In the example of FIG. 9, a plurality of antennas 141, 1
The excitation phases set for 42, 143 and 144 are respectively
Connected between the antenna and the distributor / combiner 149
Changed by phase shifters 145, 146, 147, 148
To direct the combined directivity in the desired direction
It is configured to be able to. Radio wave propagation environment judgment unit 1
Antenna control input from 29 to antenna control unit 128
The control signal is transmitted to each of the variable phase shifters 145, 146, 147, 14
8 is the excitation phase amount to be set. In the example of FIG. 9, the directivity by the variable phase shifter is used.
Although the example of the sex control has been described, other than this configuration, for example,
Signal into a baseband digital signal, and DB
Can be configured as F (Digital Beamformer)
No. In this case, the phase control is actually set by software.
Will be determined. As described above, in this embodiment, the camera 123
Transmission and reception of radio waves from the terminal device based on the data acquired by
The beam direction of the antenna to be detected is detected, and the end
To form a directivity to operate as an antenna
Therefore, the following effects can be obtained. (1) When a terminal device is used, the terminal
The direction of the beam that the antenna should direct depends on the usage
It is a town. In the conventional technology, such a beam direction is
Although it could not be recognized, the configuration of the present embodiment
Directs the beam to the desired direction.
It is possible for both cases. Therefore, the antenna
Radiated power can be transmitted efficiently toward the base station,
You can maintain good communication lines or expand the communication area
can do. (2) In addition, radio waves are emitted in useless directions.
Less interference with other terminals and base stations
it can. For this reason, increasing user capacity
It is also effective in terms of effective use of radio wave resources. (3) Efficient reception of radio waves during reception
To improve communication quality and improve receiver performance.
The line can be maintained even if it is lowered.
The wireless part can be manufactured, and the cost of the terminal device can be reduced.
It is also effective. Note that the present embodiment is as follows.
The same effect can be obtained even if various changes are made. (1) Polarization of antenna, number of antennas, antenna
The tena method is not limited to that shown here. (2) As in the first embodiment, multiple cameras are used.
Prepare several units, and acquire image information in
Comprehensively process these data to determine the position and tilt of the terminal device.
May be determined. (3) The camera is not fixed to the terminal cliff.
Can be equipped with a mechanism that can rotate, translate, etc.
Good, and the camera is driven mechanically to
Automatically obtain multiple data and process them comprehensively.
The beam direction of the terminal device may be determined. (Third Embodiment) FIG. 10 shows a third embodiment of the present invention.
9 shows a mobile terminal device according to a third embodiment. Terminal housing 24
2, an antenna 241, a camera 243, and a display unit 24
4. In addition to the operation keys 245 and 246,
And external connection terminals. FIG. 11 is a functional block diagram of the present embodiment.
Fig. The data acquired by the camera 243 is
The signal is transmitted to the wave propagation environment determination unit 247, and the
Estimate the radio wave propagation environment in the vicinity of the
Inserted between the antenna 241 and the transceiver 250
The variable gain amplifier 248 is configured to perform gain control.
You. With such a configuration, conventionally, especially the transmission system
The antenna could not be controlled in
The radio wave propagation environment near the terminal device is estimated by the
The variable gain amplification connected to the antenna 241
By controlling the gain of the device 248, the usage status of the terminal device
Always good communication environment, communication quality and good regardless of etc.
You can maintain a standby state. Specifically, in FIG.
2 to obtain image data near the terminal device,
The signal is transmitted to the wave propagation environment determining unit 247 to determine the radio wave propagation environment.
In the section 247, the terminal device is placed according to the image data.
Easy to transmit and receive radio waves in a spatial environment, that is, through environment
Squid, stored in a bag, etc., making it difficult to transmit and receive radio waves
Is inferred. For example, whether the overall brightness of image data
It is possible to judge whether the environment is outdoor or indoor,
You can't see anything at all inside
Such situations are easy to judge. Furthermore, pattern recognition etc.
Due to multipath environment, base station and line-of-sight environment
It is also possible to determine whether or not. The estimation result of such a radio wave propagation environment (judgment
Result), the transmission power of the radio wave transmitted from the antenna
Control can be performed, and transmission power is required.
Environment, increase the transmission power of the variable power amplifier,
In the environment, transmission power can be saved. Similarly, in the receiving system, the received signal level
In an environment where the power level is low,
Perform control to maximize performance and, conversely, receive environment
If it can be determined that the
To save power consumption and the like. As described above, in the present embodiment, the terminal device
The estimated radio wave propagation environment is estimated, and the variable
By performing optimal gain control of gain amplifier 248,
The following effects can be expected. (1) The power consumption can be efficiently used and the battery
Etc. can be minimized. Therefore, communication duration and waiting
This has the effect of extending the receiving time. In addition, the terminal device
The battery can be small, and the terminal device
It is effective for weight reduction and cost reduction. (2) Optimal power according to the radio wave propagation environment
Can be transmitted. Therefore, transmitting unnecessary radio waves
And avoid interference with other base stations and terminal equipment.
Can be reduced. (Fourth Embodiment) FIG. 12 shows a fourth embodiment of the present invention.
14 shows a mobile terminal device according to Embodiment 4. This mobile device
The device is, for example, a portable information terminal device or a wireless device.
-It is a personal computer, externally attached to the terminal housing 157
Or a plurality of built-in antennas 151, 152, 1
53 (an example of a three-element antenna is shown in the example of FIG.
(The number of antenna elements may be other than this.)
You. The antenna element system, polarization, and the like are not particularly limited. Ante
Camera 155, display unit 15
4. In addition to operation keys 156, microphone, speaker, external
A connection terminal and the like are provided. The camera 155 allows the caller to obtain image information
And is originally provided to send this to the other party.
However, in this embodiment, the camera 155
Monitor the environment near the terminal device, and
Radio wave propagation environment from the
The feature is to control the directivity of the tena. Of course, this
As in the previous embodiments, the camera 155 is
Monitors the usage for obtaining information and the environment near the terminal device
Can be used together for applications. FIG. 13 is a functional block diagram of the present embodiment.
Fig. The data acquired by the camera 155 is
The signal is transmitted to the wave propagation environment determination unit 173, and the
The radio wave propagation environment near the location, and based on this estimation result
The antenna control unit 172 controls the antennas 151, 152, 15
3 is performed. As a result, the antennas 151, 152,
The directivity of the radio wave transmitted / received by the transmitting / receiving unit via 153 is good.
It can be made into a good shape. Furthermore, the antenna control unit
Depending on the control method of 172, it changes every moment
Antenna directivity adaptively according to the radio wave propagation environment
It is also possible to make it. The specific control of the antenna directivity is a beam shape.
This is performed by the circuit 171, in which the antenna 151,
152 and 153 and the distributor / combiner 170
Variable gain amplifiers 164, 165, 166 and variable phase shift
Excitation and excitation of each antenna by devices 167, 168 and 169
By setting the width and excitation phase, you can combine antennas
The directivity can be changed. In FIG. 13, the beam forming circuit 171 has the RF
Analog domain such as frequency band or IF (intermediate) frequency band
It is a configuration example in the case of being realized in an area. For IF, frequency
Although a number converter, a filter, etc. are required,
Since the configuration is the same, it is omitted in the figure. FIG. 14 shows how the beamforming is performed in the digital signal area.
This is an example of a case in which it is realized in a range. Obtained by camera 155
The transmitted data is transmitted to the radio wave propagation environment determination unit 173,
Thus, the radio wave propagation environment near the terminal device is estimated, and this estimation
The antenna control unit 220 sets the antenna 15
1, 152 and 153 are controlled. As a result,
Transmit and receive via antennas 151, 152, 153
It is possible to make the directivity of the radio wave a favorable shape. Further
In addition, depending on the control method by the antenna control unit 220,
Adaptively adapts to the ever-changing radio propagation environment
It is also possible to change the antenna directivity. The antenna directivity is controlled by a digital beam
This is performed by a memory formation circuit (DBF) 216. FIG.
Shows a configuration in a receiving system as an example. Transmission system
In this case, only the signal transmission direction is reversed. antenna
The received signals received at 151, 152, and 153 are respectively
Amplifiers 201, 202, 203 connected to the antennas
After being amplified in the mixers 204, 205 and 206
(Local) oscillator 2 distributed by distributor 208
07, and multiplied by the lower frequency of the multiplied output.
The frequency component is cut out by the filter,
Is converted. Here, the frequency-converted signal is
The band may be a band (BB) or an IF band. Furthermore, here
, The quadrature detection of the I and Q components may be performed. The received signal after the frequency conversion is converted into an A / D converter
Digital signals by 212, 213 and 214 respectively
And a weighter 2 in the digital signal domain.
12, 213, 214 overlaps the received signal from each antenna.
After the placement is performed, the images are synthesized by the synthesizer 215. here
Then, the DBF 216 is connected to a DSP (digital signal processor).
And the like, the antenna control unit 22 in the DBF
0, weighters 212, 213, 214 and combiner 2
15 can be realized by software. At this time, the antenna control unit 220
Antenna weight (excitation given to each antenna element)
Sum of amplitude and excitation phase)
Is important, but different excitation
It is possible to use a site determination algorithm. According to the configuration shown in FIGS.
In the past, antenna pointing was used for transmission and reception.
Was not controlled by the camera
Estimate the pure radio wave propagation environment in the vicinity, and respond to that environment
Optimum directivity control can be performed. This
Communication environment, regardless of the usage status of the terminal device, etc.
Environment and communication quality can be maintained. Next, a specific antenna in this embodiment will be described.
The control will be described. As shown in FIG. 12, FIG. 13 and FIG.
In the configuration described above, the camera 155 first closes the terminal device.
Acquires nearby image data and sends it to the radio wave propagation environment determination unit 1
73 to the terminal device according to the image data
It is estimated whether such directivity control is optimal. For example, putter
Near the terminal device acquired by the camera using
Multipath and fading are likely to occur from image data
Environment or an environment that is unlikely to occur. More specifically, for example, the
By pattern recognition from image data near the terminal device
Good visibility outdoors by recognizing buildings, etc.
Environment (where obstacles cannot be seen) or traffic from base stations
In a line-of-sight environment where the partner station is directly visible, simply
Control such as directing the beam to the base station may be performed. Also, multi-paths such as building shadows and phasing
From the radio wave propagation environment judgment unit
In some cases, antennas can be used to prevent multipath / fading.
Control signals for performing diversity processing
To the control unit or suppress interference waves other than the desired signal.
Control signal for adaptive null control
Send to your department. Further, in an environment where interference waves are suppressed,
Also estimate the number of interference waves roughly by image processing (example
For example, estimate the number of interfering waves based on the number of buildings that reflect radio waves.
The adaptive null control according to the number of interference waves.
Antenna control of control signals that change the algorithm
To the department. Also, the image data acquired by the camera
By estimating the moving speed of the background, the fading ring
Estimate the Doppler frequency under the environment,
Antenna control algorithm sent to antenna controller
You can also. The radio wave propagation environment is estimated as described above.
Based on this, the optimal antenna control method (antenna control algorithm)
Algorithm). For example, the antenna control unit 17
In 2,220, diversity combining, adaptive beam
Multiple algorithms for control, adaptive null control, etc.
Remember, instructed by the radio wave propagation environment judgment unit
Select and operate the selected algorithm to optimize the excitation
For each antenna element.
It becomes possible. As described above, in this embodiment, the camera
Radio wave propagation where the terminal device is located by the acquired data
Estimate the environment and select the optimal antenna control in this situation
And set the required excitation weight here.
Since it is possible, the following effects can be obtained. (1) Regarding the environment in which the terminal device is used
The optimal communication environment can always be set. Especially
Estimate whether it is a fading / multipath environment such as
Excitation weight setting algorithm that matches the environment can be set
Of the excitation weight for optimal adaptive pattern molding
Optimization and faster convergence (maximum speed) are possible.
This is effective for processing in real time. Therefore,
In addition to improving communication quality, effects on processing agility and reliability
Is also big. (2) This function can be used within the coverage area.
The same is true when suppressing unnecessary interference waves from outside,
In this case, the interference wave component can be reduced.
Increases the number of users (terminals) that can be accommodated within the coverage
From the viewpoint of effective use of frequency resources.
The effect is great. Note that in the above embodiment, the camera
Radio transmission based on mobile terminal based on acquired visual information
Although the transport environment judgment process was performed inside the mobile terminal device,
The visual information (image information) obtained by the camera is
It may be transmitted to a system outside the band terminal device. in this case,
Performs radio wave propagation environment judgment processing within the external system,
This judgment result or the antenna control signal based on it is
It is configured to return to the portable terminal device. In this way, the judgment processing is left to the external system.
Configuration reduces the processing load on the mobile terminal device.
Can be summed up. In addition, such a configuration is adopted.
In this case, compress the visual information obtained by the camera of the terminal device
Transmission time can be reduced by transmitting to an external system
Wear. Compressed data such as MPEG and JPEG
If the encoder is built-in, connect the encoder to an external
Can be used to compress visual information transmitted to the system
Noh. As described above, according to the prior art, the transmission
Polarization, beam direction, power level, antenna
Although we could not recognize the na pattern etc.
According to the portable terminal device of the present invention,
Radio waves can be transmitted and received according to direction, transmission power and antenna pattern
It works. Therefore, various types of mobile terminal devices are being used.
Optimal antenna control for complex environments
Communication line quality and efficient use of transmission power.
Use, reduce interference with other communication areas and terminal devices,
An effect such as improvement of the interference performance can be expected. Further, in connection with these effects, communication
Increased reliability, increased capacity of wireless systems, frequency
Efficient use of resources, miniaturization, lightweight and cost reduction of terminal devices
Any effect can be expected.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of a mobile terminal device according to a first embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of the mobile terminal device according to the embodiment. FIG. 4 is a block diagram illustrating a configuration example of an antenna control unit in the embodiment. FIG. 4 is a block diagram illustrating another configuration example of the antenna control unit in the embodiment. FIG. 5 is a more specific configuration example of the antenna control unit in FIG. FIG. 6 is an external view of a portable terminal device according to a second embodiment of the present invention. FIG. 7 is a block diagram showing a configuration of the portable terminal device according to the same embodiment. FIG. 9 is a block diagram showing a configuration example of an antenna control unit. FIG. 9 is a block diagram showing another configuration example of the antenna control unit in the embodiment. FIG. 10 is an external view of a portable terminal device according to a third embodiment of the present invention. FIG. 11 relates to the same embodiment. FIG. 12 is a block diagram showing a configuration of a mobile terminal device. FIG. 12 is an external view of a mobile terminal device according to a fourth embodiment of the present invention. FIG. 13 is a block diagram showing a configuration example of the mobile terminal device according to the embodiment. 14 is a block diagram showing another configuration example of the portable terminal device according to the embodiment. FIG. 15 is a diagram showing an example of a conventional portable terminal device. [Description of References] 101: Vertically polarized antenna 102: Horizontally polarized antenna 124-127, 131-134, 141-144, 1
51 to 153, 241 Antennas 103, 125, 243, 155 Cameras 105, 120, 242, 157 Housings 108, 129, 247, 173 Radio wave propagation environment judgment units 109, 128, 172, 220 Antenna control units 110, 130, 250 transmission / reception units 111, 135 switch 112 variable power distributors 113, 114 hybrid circuits 116, 117, 145 to 148, 167 to 169 variable phase shifters 149, 170, 215 distribution / combination 248, 164 to 166 variable power amplifiers 171 and 216 beam forming circuits 212 to 214 weighting device

Claims (1)

  1. (57) [Claim 1] In a portable terminal device equipped with a camera, a camera detects visual information in the vicinity of the portable terminal device, and radio wave propagation based on the visual information with respect to the portable terminal device. A mobile terminal device configured to control an antenna for transmitting and receiving radio waves based on a determination result of an environment. 2. A camera for detecting visual information in the vicinity of a portable terminal device, a radio wave propagation environment determining means for judging a radio wave propagation environment based on the portable terminal device from the visual information, and an antenna for transmitting / receiving a radio wave. A mobile terminal device comprising: an antenna control unit that controls the antenna based on a determination result of the radio wave propagation environment determining unit. 3. The radio wave propagation environment judging means judges the attitude of the portable terminal device with respect to the ground from the visual information as a radio wave propagation environment based on the portable terminal device. 3. The portable terminal device according to claim 2, wherein the polarization of a radio wave transmitted or received from the antenna is changed based on a determination result of the determination unit. 4. The radio wave propagation environment judging means judges a direction of a communication partner of a portable terminal device from the visual information as a radio wave propagation environment with respect to the portable terminal device. 3. The mobile terminal device according to claim 2, wherein the directivity of transmitting or receiving from the antenna is changed based on a result of the determination by the environment determining unit. 5. The radio communication apparatus according to claim 2, wherein said antenna control means changes electric power of radio waves transmitted from said antenna based on a result of determination by said radio wave propagation environment determining means.
    The portable terminal device according to the above. 6. The antenna has a plurality of antenna elements, and the excitation amplitude and the excitation phase of each of these antenna elements can be set by a predetermined excitation control algorithm. 3. The portable terminal device according to claim 2, wherein the excitation control algorithm is changed based on a result of the determination by the determining unit.
JP28035199A 1999-09-30 1999-09-30 Mobile terminal device Expired - Fee Related JP3513058B2 (en)

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JP3920196B2 (en) 2002-11-11 2007-05-30 松下電器産業株式会社 Portable wireless device
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JP5122471B2 (en) * 2005-11-07 2013-01-16 トムソン ライセンシングThomson Licensing Apparatus and method for controlling signals
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JP5381150B2 (en) * 2009-02-23 2014-01-08 パナソニック株式会社 Diversity antenna device and electronic device using the same
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