JP2001128246A - Communication system, communication device used for the communication system and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication device that can be connected only to a device within a limited range without causing unnecessary power consumption and processing load. SOLUTION: A radio communication device control section 27 of the radio communication device 19 sets the gain of a transmission amplifier 23 and a reception amplifier 25 respectively stepwise in order to select radio communication performance, that is, radio transmission capability and wireless reception capability depending on a mode instructed by a mode selection switch 28. Since the radio communication capability can be revised while ensuring prescribed communication quality, the radio reception capability is decreased so as to prevent transmission data sent from a device requiring no connection from being received. Thus, the reception amplifier 25 does not need to receive a signal from an unnecessary device, no execution of ID discrimination processing or the like is required by a succeeding receiver data processing section 26, so that the processing load is relieved and the power consumption can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for performing data communication using radio waves between devices having wireless communication means, for example, in an office, at home, or in a car, and a communication device used in the communication system. , And a communication method.

[0002]

2. Description of the Related Art In recent years, a wireless communication network is constituted by one master unit and a plurality of slave units, and a communication method for performing time-division multiplexed data communication between the master unit and the slave unit has been described by using a personal computer and its personal computer. It has been considered to apply the technology to interfaces with peripheral devices (mouse, printer, mobile phone, etc.) to make devices wireless. In such a communication method, usually, any devices having similar communication means can be connected to each other, and can be connected to devices within a range (for example, within a radius of 10 m) according to the wireless communication capability. Communication is possible.

On the other hand, when considering application to a personal computer and its peripheral devices, there is a case where it is desired to connect only to devices within a very limited range. For example, when only a personal computer on your desk and peripheral devices such as a mouse are limitedly connected, and you do not want to be connected to a computer or peripheral device used by another person who is some distance away It is.

[0004] In the prior art, there is the following technique to satisfy such purpose. For example, (1) reduce the wireless output so that it can only communicate with devices within a limited range; (2) identify the attributes (such as ID codes) of the communication partner, and For example, actual data communication is performed. Such a technique is disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 8-88583, "Wireless Device", and the Institute of Electronics, Information and Communication Engineers, "Wireless Transmission System of IMT-2000", February 1999, p.

[0005]

As described above, in the conventional communication method, in order to perform communication with a device within a limited range, the above-mentioned techniques (1) and (2) are used. Had been. However, in the above-described related art, since the receiving capability at the time of performing wireless communication is fixed, even if the wireless output of a device that does not require connection is reduced, transmission data from the device is received. There are cases. For this reason, there is a problem that a process for removing the data is required and unnecessary power consumption occurs, and an unnecessary processing load is generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has a communication system that can be connected only to devices within a limited range without generating unnecessary power consumption or processing load. It is an object of the present invention to provide a communication device and a communication method used in this communication system.

[0007]

According to the present invention, there is provided a communication system in which a first device performs wireless communication with a second device, wherein a predetermined communication is established between the first device and the second device. The wireless communication performance for performing wireless communication between the first device and the second device is changed to a plurality of stages so as to maintain the communication quality of the first device and reduce the reception quality from other devices. Control means for performing the control.

Thus, the second device (slave device) within the limited effective communication range can communicate with the first device (master device) wirelessly enough to maintain a predetermined communication quality. By lowering the communication performance, it is possible to reduce the power consumption and the processing load, and it is possible to avoid transmitting and receiving unnecessary signals to and from devices outside the effective communication range.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the communication system according to the first embodiment. In the communication system according to the first embodiment, a wireless network is configured by a plurality of wireless communication devices. The wireless communication device is used by being mounted on various information processing devices, communication devices, and the like. For example, a wireless LA of 2.45 GHz band is used.
Wireless communication is performed by N or Bluetooth. Note that Bluetooth is a short-range wireless communication standard and is a 2.4 GHz band ISM (Industry Scienc).
e Medical) band to realize wireless communication within 10 m. In Bluetooth, a frequency hopping method is used as a spread spectrum technique, and up to eight devices can be connected by a time division multiplex method. In Bluetooth, devices connected by a time-division multiplexing method form a network called a piconet, and one device functions as a master device (first device) and the other devices function as slave devices (second devices). In this network (piconet), connection authentication is performed by a personal identification number called a PIN (Personal Identification Number) code.

[0010] In the example shown in FIG.
A personal computer 1, a mouse 2 functioning as a slave, a printer 3, and a mobile phone (modem function) 4 constitute a wireless network. The mouse 2, the printer 3, and the mobile phone (modem function) 4 are peripheral devices of the personal computer 1 used within a limited effective communication range with respect to the installation position of the personal computer 1,
Only the personal computer 1 is connected. The personal computer 1, which is a parent device, performs wireless communication with a plurality of peripheral devices (communication devices) by a time division multiplex method.

FIG. 2 is a block diagram showing a configuration of a wireless communication device 19 mounted on devices (a personal computer 1, a mouse 2, a printer 3, and a mobile phone 4) constituting a communication system. The wireless communication device 19 includes a device main body 20
The wireless communication is performed in response to a request from the server, and the basic processing of data transmission and reception is executed as follows.

At the time of data transmission, transmission data from the device main unit 20 input from the data interface unit 21 is converted into an RF signal by a transmission data processing unit 22, and the RF signal is amplified by a transmission amplifier 23 and transmitted to an antenna. Radiates from 24. At the time of data reception, an RF signal received by the antenna 24 is amplified by the reception amplifier 25, and the received data is reproduced by demodulating the RF signal by the reception data processing unit 26. Output to The wireless communication device control unit 27 realizes the above-described data transmission and reception by controlling each unit. Also,
The wireless communication device control unit 27 includes a mode selection switch 28
The gain of the transmission amplifier 23 and the gain of the reception amplifier 25 are set stepwise in accordance with the mode specified by the (communication quality indicating means), thereby ensuring a constant communication quality according to the mode, That is, the radio transmission capability and the radio reception capability can be switched. The mode selection switch 28 is, for example, a normal mode, a distance designation mode,
An automatic mode can be designated (the operation of each mode will be described later in detail).

The reception data processing section 26 includes a reception amplifier 25
If there is an RF signal of an effective level from, processing is performed on the RF signal. Therefore, even when transmission data from a device that does not need to communicate is received, the reception amplifier 2
If the signal amplified in step 5 is a valid level, it is demodulated in a processing stage after the reception data processing unit 26, identification information (ID) indicating the device of the data transmission source is confirmed, and It is necessary to perform control to ignore the signal.

Further, the radio reception capability is switched under the control of the radio communication device control unit 27 in accordance with the designation of the mode selection switch 28, so that the reception capability is adjusted so that only transmission data from devices within the effective communication range is received. By lowering, signals from devices that do not need to communicate will not be at an effective level,
It is not necessary to execute ID discrimination processing or the like after the reception data processing unit 26, and it is possible to suppress power consumption and generation of a load on the processing system.

Next, the timing of data communication between devices (wireless communication devices) will be described with reference to a timing chart shown in FIG. In FIG. 3, the wireless communication device (1) is a master unit (personal computer 1), and the wireless communication devices (2), (3), and (4) are slave units (mouse 2, printer 3, mobile phone 4).

The wireless communication device control unit 27 of each device holds network information, and determines the timing of data transmission and reception within the wireless network based on the network information. The network information indicates the IDs of all the slaves in the network and the transmission / reception timing with each slave in the case of the master, and the ID of the master in the network and the transmission / reception with the master in the case of the slave. Shows timing.

As shown in FIG. 3, data communication is performed between the master unit and the slave unit by the time division multiplex system. That is, the wireless communication device (1), which is the parent device, transmits and receives data one-to-one with the wireless communication device (2) in time slot 1. Next, in time slot 2, data is transmitted and received one-to-one with the wireless communication device (3),
In time slot 3, data is transmitted and received one-to-one with the wireless communication device (3). Hereinafter, similarly,
Data transmission / reception is performed while changing the target wireless communication device for each time slot.

Next, the operation of the wireless communication device 19 according to the first embodiment will be described. Mode selection switch 28
In this case, for example, a normal mode, a distance designation mode, and an automatic mode can be designated by operating the user of the device. The mode selection switch 28 may be a mechanical switch or a switch set by software. In the software setting, for example, a mode setting screen is displayed on the device main body unit 20,
It is assumed that the user can designate an arbitrary mode by operating the mouse 2 on the screen.

When the normal mode is set, the radio communication device control unit 27 sets the gains of the transmission amplifier 23 and the reception amplifier 25 to a specified (maximum), and specifies (maximum) radio transmission capability and radio reception capability. To maintain and operate.

When the distance designation mode is set, it is possible to designate a communicable range (distance between devices). For example, options “about 5 m”, “about 3 m”, “about 1
m "and" about 50 cm ". When a specific distance is designated in the distance designation mode, the wireless communication device control unit 27 determines the communication partner (maximum).
The transmission amplifier and the reception amplifier have their gains reduced so that the communicable ranges are about 5 m, about 3 m, about 1 m, and about 50 cm, respectively. It is assumed that the gain to be set according to the communicable range (distance) is set in advance in the wireless communication device control unit 27. In addition, the gain corresponding to each communicable range preset in the wireless communication device control unit 27 is arbitrarily adjusted according to the use environment state of the master unit and the slave unit, for example, according to an instruction from the user. You may be able to.

Thus, the radio communication device 19 can transmit data only to a partner within a limited range according to the communicable range (distance) specified by the user. Also, since the gain of the receiving amplifier is low, a valid level is not output from the receiving amplifier for transmission data from a partner outside the range, and the processing units subsequent to the receiving data processing unit 26 do not operate, resulting in unnecessary power consumption. And unnecessary processing load does not occur.

Next, when the automatic mode is set, the wireless communication device control unit 27 determines the gain of the transmission amplifier 23 and the gain of the reception amplifier 25 by executing the gain adjustment processing shown in the flowchart of FIG. I do. First, the wireless communication device control unit 27 lowers the gain of the receiving amplifier 25 by one step from the maximum value, and causes data communication to be executed. The reception amplifier 25 amplifies the RF signal received by the antenna 24 according to the gain set by the wireless communication device control unit 27, and converts the RF signal to the reception data processing unit 2
6 is output. The reception data processing unit 26 includes the reception amplifier 2
5 to reproduce the received data. The wireless communication device control unit 27 checks whether the communication quality at a preset stage is ensured based on the error rate before error correction of the reception data reproduced by the reception data processing unit 26. That is, when the error rate of the received data is not equal to or higher than the predetermined fixed value (step A2), the wireless communication device control unit 27 further lowers the gain of the receiving amplifier 25 by one step (step A1). Note that the constant value used to determine the error rate is a value that enables sufficiently stable data transmission and reception, for example, a value that is equal to or less than the error rate when the slave unit is normally used for the master unit. And

When the error rate exceeds a certain value by repeating the above processing, the radio communication device control unit 27
Sets the gain of the receiving amplifier 25 one step higher (step A3). That is, the gain of the receiving amplifier 25 can be automatically set so that communication quality (required minimum receiving performance) in which the error rate does not exceed a certain value can be secured.

Further, the radio communication device control unit 27 sets the gain of the transmission amplifier 23 to a value equivalent to the gain set in the reception amplifier 25, for example, in accordance with the gain set in the reception amplifier 25 (step A4). As a result, even at the time of data transmission, it is possible to automatically set the minimum output necessary for ensuring a constant communication quality for the master unit.

The master unit (personal computer 1)
In the wireless communication device 19 mounted on the base station as well, by reducing the gains of the transmission amplifier 23 and the reception amplifier 25 as described above, the wireless transmission capability and the wireless reception performance can be reduced. Now in normal mode,
That is, the gains of the transmission amplifier 23 and the reception amplifier 25 are set to specified values (maximum values), and the wireless transmission performance and the wireless reception performance are changed only in the child device (the mouse 2, the printer 3, the mobile phone 4). You may do it. As a result, the slave unit can execute data transmission / reception only with the master unit, and the master unit can communicate with another device far away beyond the limited effective communication range by maintaining the wireless communication capability. Can do it.

As described above, in the communication system according to the first embodiment, the wireless reception capability at the time of performing wireless communication is changed while ensuring a constant communication quality according to the mode instructed by the mode selection switch 28. Therefore, according to a change in the use environment or a user's request, the wireless reception capability can be reduced so that transmission data from a device that does not require connection is not received. Therefore, the receiving amplifier 25 does not receive a signal from a device that does not need to be connected to a valid level, and the subsequent processing performed on the signal received by the receiving amplifier 25, for example, the ID by the reception data processing unit 26 It is not necessary to execute a determination process or the like, so that the processing load on the wireless communication device 19 mounted on the device can be reduced and the power consumption can be reduced. Power consumption can also be reduced by reducing the wireless communication capability as the wireless reception capability is reduced.

When performing wireless communication using Bluetooth as a wireless communication method as described above, Bluetooth uses a PIN in a network (piconet) formed by a plurality of wireless communication devices.
(Personal Identification Number) The connection authentication is performed using a personal identification number called a code. However, the processing for the reception connection authentication is omitted by changing the wireless reception performance and preventing unnecessary signals from being received using the present invention. Above, a slave unit that performs data communication with one master unit can be specified, and power consumption can be further reduced.

Next, a second embodiment of the present invention will be described. FIG. 5 is a block diagram illustrating a configuration example of a communication system according to the second embodiment. The communication system shown in FIG. 5 performs communication using a wireless communication function of the mobile phone 51 between the information processing device 50 corresponding to the parent device and the mobile phone 51 corresponding to the child device. The information processing device 50 and the mobile phone 51 are connected via the connection.

The mobile phone 51 incorporates a wireless communication device 53 (for example, having the above-described configuration shown in FIG. 2) for communicating with an information processing device 50 such as a personal computer or a main unit of a car navigation system. Yes,
When the information processing apparatus 50 is located away from the information processing apparatus 50, the wireless communication apparatus 53 (for example, having the configuration shown in FIG. 2 described above) provided on the table 52 in the same manner as in the first embodiment described above. As described with reference to FIG. 3 in the first embodiment, data communication is performed by the time division multiplex method. The wireless communication device 54 of the table 52 is connected to the information processing device 50 by a cable, so that the mobile phone 51 and the information processing device 50 are connected to execute data communication. The connection of the cable to the information processing device 50 uses an existing connector provided in advance in the information processing device 50.

When the mobile phone 51 is used in a place remote from the information processing device 50, the information processing device 50 performs data communication using the mobile phone 51 as one of a plurality of peripheral devices (child devices). Also, data communication is performed with other devices by a time division multiplex method.

When it is not necessary to use the mobile phone 51 in a place away from the information processing device 50, the mobile phone 51 is placed in a receiving portion formed on the upper portion of the table 52 as shown in FIG. By placing the mobile phone, the mobile phone 51 can be mechanically held in the receiving portion, and the same data communication as when the mobile phone 51 and the information processing device 50 are connected by wire can be executed. That is, the information processing device 50
The (wireless communication device 54 of the table 52) specifies the other party of the data communication to the mobile phone 51 and performs the data communication while the wireless communication with a plurality of devices can be simultaneously performed by the time division multiplexing method. Can be performed.

As shown in FIG. 5, the antenna 5 is held by merely placing the portable telephone 51 on the receiving portion of the pedestal 52, and is provided in the wireless communication device 53 of the portable telephone 51.
5 (transmitting and receiving portion of the wireless signal) and an antenna 56 (transmitting and receiving portion of the wireless signal) provided in the wireless communication device 54 on the table 52 are set so as to be close to and opposed to each other.

A power receiving connector 57 is provided at the bottom of the portable telephone 51 (the portion where the receiving portion of the placing table 52 is held).
Is provided. The power supply receiving connector 57 is configured to be electrically connected to a power supply connector 58 provided at a receiving portion of the table 52 when the mobile phone 51 is set on the table 52. The power supply connector 58 of the table 52 receives a current from the power supply unit of the information processing device 50 via a cable.

A detection switch 60 is provided at the bottom of the mobile phone 51. When the mobile phone 51 is set on the table 52, the detection switch 60 contacts the detection switch 61 provided on the upper surface of the table 52 to detect that the mobile phone 51 is set on the table 52. I do.
The detection by the detection switch 60 is notified to the wireless communication device 53. On the other hand, the mobile phone 5
The detection switch 6 is located at a position facing the first detection switch 60.
1 is provided. The detection switch 61 is connected to the mobile phone 5
When the device 1 is set on the table 52, it comes into contact with the detection switch 60 of the cell phone 51 and the cell phone 51
Is detected and notified to the wireless communication device 54.

A shield member 62 is provided at the bottom of the mobile phone 51, and a shield member 63 is provided at a receiving portion of the table 52. As shown in FIG. 5, for example, the receiving portion of the placing table 52 has a concave shape so that when the mobile phone 51 is placed on the upper portion, the bottom of the mobile phone 51 can be mechanically stably held. The shield member 63 is provided on the inner surface of the recess. As shown in FIG. 5, when the mobile phone 51 is set on the table 52, the shield member 62 and the shield member 63 transmit and receive a radio wave between the antenna 55 and the antenna 56 (communication path).
Is shielded, and interference from other devices does not occur.

Next, the operation and effect of the communication system according to the second embodiment will be described. When the mobile phone 51 is used away from the information processing device 50 (table 52),
As in the case of the first embodiment, detailed description is omitted as it functions as one of the slave units. However, in the configuration according to the second embodiment, the information processing device 50
The mobile communication device 54 provided in the mobile phone 5
1 to perform data communication with a device that functions as a child device including the device 1.

On the other hand, when only the mobile phone 51 among a plurality of devices is to perform data communication with the information processing device 50, the mobile phone 51 is set on the table 52. Thus, the mobile phone 51 is mechanically and electrically connected to the table 52.

That is, the detection switch 6 of the mobile phone 51
0 and the detection switch 61 of the table 52, the wireless communication device 53 of the mobile phone 51 and the table 52
Wireless communication device 54 includes detection switches 60 and 6 respectively.
In response to the notification from 1, it is detected that the mobile phone 51 is set on the table 52.

When the mobile phone 51 is set on the table 52, the antenna 55 and the antenna 56 are close to each other.
The wireless communication capability of the wireless communication device 54 can be reduced to a minute constant level. The wireless communication device 53 and the wireless communication device 54 perform data communication by reducing the gains of the transmission amplifier and the reception amplifier in response to the detection by the detection switch 60 and the detection switch 61, respectively, to increase the wireless communication capability. .

When the mobile phone 51 is set on the table 52, the power receiving connector 57 of the mobile phone 51 and the power supply connector 58 of the table 52 are connected. Thereby, the mobile phone 51 can operate based on the electric power supplied from the information processing device 50 via the table 52, and can reduce the consumption of a built-in battery (not shown), or Can be charged.

When the mobile phone 51 is set on the table 52, the space between the receiving portion of the table 52 and the bottom of the mobile phone 51 is shielded. Radio waves transmitted from the wireless communication device 54 of the table 52 do not reach other devices, and radio waves from other devices are not received by the antennas 55 and 56. Therefore, the wireless communication device 5 of the mobile phone 51
Radio waves can be transmitted and received only between the wireless communication device 3 and the wireless communication device 54 of the table 52, and data communication can be executed stably.

As described above, in the communication system according to the second embodiment, the portable telephone 51 is mechanically and electrically connected by setting the portable telephone 51 on the table 52 on which the wireless communication device 54 is provided. Wireless communication can be executed between the wireless communication device 53 of the mobile phone 51 and the wireless communication device 54 of the placing table 52 without receiving interference from the mobile phone 51. That is, the mobile phone 51 and the information processing device 5
0 is connected to the mobile phone 51 in the same manner
Only the data communication with the information processing device 50 can be performed. Since the mobile phone 51 is connected to the information processing device 50 using the function of the wireless communication device 53 via the table 52 provided with the wireless communication device 54, it is necessary to newly provide an interface for wired connection. And stable data communication similar to the case of a wired connection is possible. That is, as in the case of the wired communication, the confidentiality of the communication can be maintained because the connection partner can be surely limited, and there is no unnecessary interference from other devices. In addition, table 5
2, the data communication can be executed and the power supply can be received from the information processing device 50 at the same time. Therefore, even when the remaining battery level of the mobile phone 51 is low, the data communication is continuously executed. be able to.

In the above-described second embodiment, the detection switch 61 is provided on the table 52 to detect that the mobile phone 51 has been set.
Is reduced to a certain level, but a configuration without the detection switch 61 is also possible. For example, the wireless communication device 54 of the table 52 executes the automatic mode described in the first embodiment so that the required data transmission / reception capability in a state where the mobile phone 51 is set in the receiving unit is attained. can do.

In the example shown in FIG. 5, the antenna 55 of the mobile phone 51 and the antenna 56 of the base 52 are described as being close to each other when the mobile phone 51 is set on the table 52. The antenna 55 and the antenna 56 may be in contact. Further, in FIG. 5, the wireless communication device 54 provided on the table 52 may be provided in the main body of the information processing device 50. In this case, as for the antenna 56 which is a transmission / reception part of the radio signal, the mobile phone 51
When the mobile phone 51 is set on the table 52, the mobile phone 51 may be located at a position close to the antenna 55, which is a portion for transmitting and receiving wireless signals of the mobile phone 51.

Next, a third embodiment of the present invention will be described. In the second embodiment, the antenna 55 of the mobile phone 51
By making the antenna of the table 52 and the antenna 52 close to each other, only the mobile phone 51 can perform data communication with the information processing device 50. In the third embodiment, however, the wireless communication devices provided in the respective devices communicate with each other. The wireless communication for executing the data communication is specified by the wired connection via the antenna.

FIG. 6 shows an example of a configuration in which three wireless communication devices 70, 71 and 72 provided in different devices are connected. Wireless communication devices 70, 71, 7
Numerals 2 are mutually connected by a coaxial cable 74, and antennas 70a and 71 provided respectively are provided.
a, 72a (radio signal transmitting / receiving part) are coaxial cable 7
4 and connected to GNDs 70b, 71
b and 72b are mutually connected by an external conductor.
Three or more wireless communication devices 7 as in the configuration example shown in FIG.
0, 71 and 72 are connected to each other,
Is provided to relay the connection between the conductors and to match the impedance.

Each of the wireless communication devices 70, 71, 72 operates as described in the first embodiment when the device on which it is mounted is used alone (in a remote place). On the other hand, specific wireless communication devices 70, 71, 72
When data communication is to be performed only between the antennas 7 through the coaxial cable 74, as shown in FIG.
0a, 71a, 72a (GND 70b, 71b, 72
b) connect each other. Accordingly, the wireless communication devices 70, 71, and 72 can execute data communication by ordinary wireless communication operation by reliably limiting the connection partner. Therefore, the confidentiality of communication can be maintained, and unnecessary interference from other devices can be reduced. Further, since the antenna 70a, 71a, 72a is connected to each other by a coaxial cable 74 to identify a device as a communication partner, a wire communication interface is provided for the device on which the wireless communication devices 70, 71, 72 are mounted. Without the need, the connection partner can be reliably limited as required similarly to the wired communication device, and stable data communication can be executed.

FIG. 7 shows a configuration example in which a power supply line is further provided in the connection configuration shown in FIG. FIG.
In the example shown in (1), a personal computer 80 functioning as a master unit and a mouse 81 functioning as a slave unit are connected via a connection cable 82. The personal computer 80 is provided with a wireless communication device 80a, and the mouse 81 is provided with a wireless communication device 81a. The connection cable 82 connects the antenna 80b provided in the wireless communication device 80a to the GND 80c, and connects the antenna 81b provided in the wireless communication device 81a to the GND 81c. Further, the connection cable 82 is connected to a power supply terminal 8 provided on the personal computer 80.
0d is connected to a power receiving terminal 81d provided on the mouse 81.

Thus, for example, when the battery is not provided in the mouse 81 having the built-in wireless communication device 81a, or when the battery is provided and the remaining amount is small, the mouse 81 can be used. It can be used in the same way as a normal wired mouse.

[0050]

As described in detail above, according to the present invention, the radio communication performance for performing radio communication can be changed so as to be reduced to such an extent that a certain communication quality can be ensured. It is possible to connect only to devices within a limited range without generating unnecessary power consumption or processing load.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a communication system according to a first embodiment.

FIG. 2 is a block diagram showing a configuration of a wireless communication device 19 mounted on a device constituting the communication system.

FIG. 3 is a timing chart showing the timing of data communication between devices (wireless communication devices).

FIG. 4 is a flowchart illustrating an operation of a gain adjustment process performed when an automatic mode is set.

FIG. 5 is a block diagram illustrating a configuration example of a communication system according to a second embodiment.

FIG. 6 is a block diagram illustrating a configuration example of a communication system according to a third embodiment.

FIG. 7 is a block diagram illustrating a configuration example of a communication system according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Personal computer 2 ... Mouse 3 ... Printer 4 ... Cellular phone 19, 70, 71, 72 ... Wireless communication apparatus 20 ... Equipment main body 21 ... Data interface 22 ... Transmission data processing 23 ... Transmission amplifier 24 ... Antenna 25 ... Reception amplifier 26 ... Reception data processing unit 27 ... Wireless communication device control unit 28 ... Mode selection switch 51 ... Mobile phone 52 ... Place 53,54 ... Wireless communication device 55,56 ... Antenna 57 ... Power receiving connector 58 ... Power supply connector 59 ... Information processing device 60, 61 ... Detection switch 62, 63 ... Shield member

Claims (14)

[Claims] 1. A communication system in which a first device performs wireless communication with a second device, wherein a predetermined communication quality is maintained between the first device and the second device, and In order to reduce reception quality from devices other than these, a control unit for changing wireless communication performance for performing wireless communication between the first device and the second device in a plurality of stages is provided. A communication system characterized by the following. 2. The communication system according to claim 1, wherein only one of the first device and the second device changes the wireless communication performance. 3. A communication method in which a first device performs wireless communication with a second device, wherein a predetermined communication quality is maintained between the first device and the second device, and A communication method comprising: changing wireless communication performance for performing wireless communication between the first device and the second device to a plurality of stages so as to reduce reception quality from other devices. . 4. A communication device for performing wireless communication with another device, comprising: a communication quality instructing unit for instructing a communication quality with another device for each of a plurality of stages; According to the communication quality, the communication quality is maintained with another device to be communicated with, and the reception quality from the device other than the other device is reduced. And a control unit for changing a wireless communication performance for performing wireless communication in the communication device. 5. The communication apparatus according to claim 1, further comprising: a signal amplifying unit that receives the wireless signal and amplifies the signal according to a predetermined gain, wherein the control unit controls the wireless communication quality indicated by the communication quality indicating unit. 5. The communication device according to claim 4, wherein a gain in said signal amplifying means is switched in accordance with the following. 6. The communication device according to claim 4, wherein the control unit changes the wireless communication performance with another device that performs wireless communication with a plurality of communication devices. 7. The communication apparatus according to claim 4, wherein said communication quality instruction means instructs communication quality according to a request from a user. 8. When the communication quality in a preset stage is instructed by the communication quality instructing means, the control means, based on the quality of data received by wireless communication with another device, 5. The communication device according to claim 4, wherein the wireless communication performance is adjusted so that the communication quality is instructed by the communication quality instructing means. 9. A communication device for performing wireless communication with a plurality of other devices, wherein the other device is mechanically held, and is close to a held wireless signal transmission / reception portion of the other device. Wireless communication means for performing wireless communication via a wireless signal transmission / reception part with another device mechanically held by the connection means; and Characteristic communication device. 10. The communication device according to claim 9, wherein the wireless communication unit executes wireless communication by reducing wireless communication capability when the other device is held by the connection unit. . 11. The communication device according to claim 9, wherein the connection unit is configured as a table, and holds the other device by placing the other device on a receiving portion formed at an upper portion. 12. A shield means for shielding a communication path formed between a transmission / reception part provided in each of said other apparatus and said connection means while said another apparatus is held by said connection means. The communication device according to claim 9, comprising: 13. The power supply means for electrically connecting the power supply to the power supply means provided in the other device when the other device is held, the power supply means being provided in the connection means. The communication device according to claim 9, wherein the communication is performed. 14. A communication system for performing wireless communication between communication devices, further comprising a wired connection means for connecting wireless signal transmission / reception portions provided in the communication device for performing wireless communication to each other by wire. Communications system.