JP2004363728A - Wireless information communication terminal - Google Patents

Wireless information communication terminal Download PDF

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Publication number
JP2004363728A
JP2004363728A JP2003157190A JP2003157190A JP2004363728A JP 2004363728 A JP2004363728 A JP 2004363728A JP 2003157190 A JP2003157190 A JP 2003157190A JP 2003157190 A JP2003157190 A JP 2003157190A JP 2004363728 A JP2004363728 A JP 2004363728A
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JP
Japan
Prior art keywords
wireless communication
communication unit
wireless
unit
information
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.)
Withdrawn
Application number
JP2003157190A
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Japanese (ja)
Inventor
Katsuo Saito
勝雄 斉藤
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP2003157190A priority Critical patent/JP2004363728A/en
Publication of JP2004363728A publication Critical patent/JP2004363728A/en
Withdrawn legal-status Critical Current

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Abstract

An object of the present invention is to provide a wireless information communication terminal capable of reducing interference between mutual communications even when communications are simultaneously performed in the same frequency band using a plurality of different wireless communication schemes.
The wireless information communication terminal includes a first wireless communication unit compliant with the Bluetooth standard and a second wireless communication unit compliant with IEEE802.11. The communication state of the second wireless communication unit 103 is stored as communication state monitoring information, and the transmission output of the first wireless communication unit 102 is controlled according to the communication state of the second wireless communication unit 103 in the communication state monitoring information. I do.
[Selection diagram] FIG.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless information communication terminal, and more particularly to a wireless information communication terminal having a plurality of wireless communication units in the same housing and performing control so that communication by the plurality of wireless communication units does not interfere with each other.
[0002]
[Prior art]
2. Description of the Related Art In recent years, wireless information communication terminals such as personal computers (hereinafter, simply referred to as “PCs”) having a wireless communication function have been reduced in frequency and used for wireless communication to a high frequency range due to reduction in size and weight and increase in data rate. It is expanding and broadening. For example, a wireless information communication terminal that performs high-speed digital wireless transmission using an OFDM (Orthogonal Frequency Division Multiplexing) method of multicarrier transmission using a carrier frequency of 5 GHz defined by the IEEE 802.11a standard has appeared.
[0003]
As described above, while wireless information communication terminals using higher frequencies have emerged for the purpose of high-speed data transmission, wireless information communication terminals using various wireless communication methods have been used in conventional wireless communication using the ISM band. There are many.
[0004]
In particular, in recent years, notebook PCs that can wirelessly communicate with various peripheral devices such as digital cameras, scanners, and printers, and mobile devices such as PDAs (Personal Digital Assistants) have been developed. A connection cable for connecting between the device and a peripheral device or a mobile device is being replaced by wireless.
[0005]
Wireless communication for connecting a PC to a peripheral device or the like is performed based on a short-range wireless communication standard such as the IEEE802.11a standard or Bluetooth. Therefore, recent PCs include, for example, other indoor PCs. A plurality of different wireless communication modules are built in the main body or inserted in the form of a wireless card in order to wirelessly communicate with the wireless LAN, the peripheral device, and the wireless LAN access point. At that time, it is expected that a plurality of different wireless communication modules are arranged close to each other in the same housing.
[0006]
In a room, wireless communication between one set of PCs and peripheral devices and wireless communication between another set of PCs and peripheral devices are simultaneously performed in a state where they are arranged close to each other. It is also expected.
[0007]
[Patent Document 1]
JP 07-177059 A
[0008]
[Problems to be solved by the invention]
However, in the above-described conventional wireless information communication terminal, when communication is performed simultaneously by a plurality of different wireless communication modules in the main body, the transmission radio wave transmitted from the transmission unit of at least one of the wireless communication modules is transmitted to the other wireless communication module. Interferes with the received radio wave to be received by the receiving unit, and is received as an interference wave or an interference wave by the receiving unit.
[0009]
In particular, since wireless information communication terminals such as notebook PCs are miniaturized, even if a plurality of wireless communication modules and their attached antennas are arranged as far away from each other as possible, interference between radio waves can be sufficiently reduced. May not be reduced.
[0010]
Further, when a plurality of wireless communication modules simultaneously perform communication using different wireless communication schemes and different frequency bands are used, the frequency is controlled by an RF filter or the like provided at the RF front end of each wireless communication module. Although separation is possible, for example, a wireless LAN conforming to the IEEE802.11b standard and Bluetooth, which is a short-range wireless communication standard, use the same frequency band as 2.4 GHz.
[0011]
Therefore, when one of the plurality of wireless communication modules is in the transmission state and the other is in the reception state, the frequencies used are the same, and the transmission radio wave transmitted from the transmission unit of the one wireless communication module is used. Is received as an interference wave or simply as an interference wave by the receiving unit of the other wireless communication module in the receiving state, and the reception S / N is deteriorated. This is a particularly serious problem in a small PC or the like in which a plurality of wireless communication modules are built in the same housing.
[0012]
One way to solve this problem is to avoid interference with one wireless communication module by adopting a complete time-sharing system that does not communicate when the other wireless communication module is in communication. Although it is possible, performing communication in a time-division manner causes a decrease in the throughput of each wireless communication module.
[0013]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has been made in consideration of the problem that even when simultaneous communication is performed in the same frequency band by a plurality of different wireless communication systems, wireless information capable of reducing interference between the communication can be reduced. It is intended to provide a communication terminal.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, a wireless information communication terminal according to claim 1 uses a first wireless communication unit and a second wireless communication unit that operate in the same frequency band using different wireless communication systems. Communication state monitoring means for monitoring communication states of the first wireless communication means and the second wireless communication means, respectively, and communication state monitoring information for storing the communication state as communication state monitoring information. Storage means; and transmission output control means for controlling transmission output of one of the first wireless communication means and the second wireless communication means based on the stored communication state monitoring information. And
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
FIG. 1 is a schematic diagram showing an overall configuration of a system including a wireless information communication terminal according to an embodiment of the present invention.
[0017]
In FIG. 1, the system includes a notebook including a plurality of wireless communication units 102 and 103 capable of communicating with a wireless communication terminal such as a personal computer (hereinafter, simply referred to as a “PC”) or a printer having a wireless communication function. And a notebook PC having a wireless communication unit 107 capable of communicating with the PC 101, and a printer 104 having a wireless communication unit 105 capable of communicating with wireless information communication terminals such as the PC 101 and the PC 106. Have been.
[0018]
A plurality of wireless communication units 102 and 103 are incorporated in the PC 101 as a wireless communication module or a wireless card. The PC 101 includes a wireless card conforming to the IEEE802.11b standard as the wireless communication unit 102, and is wirelessly connected to another wireless information communication terminal (for example, the PC 106) adopting the same wireless communication scheme via the wireless card. .
[0019]
The PC 101 includes a wireless card conforming to the Bluetooth standard as the wireless communication unit 103, and is wirelessly connected to another wireless information communication terminal (for example, a printer 104) that employs the same wireless communication method via the wireless card. You.
[0020]
A wireless communication module or a wireless card conforming to the IEEE802.11b standard is incorporated as a wireless communication unit 107 in the PC 106 as a communication partner of the wireless communication unit 102. A wireless communication module or a wireless card conforming to the Bluetooth standard is incorporated in the printer 104 as a communication partner of the wireless communication unit 103 as the wireless communication unit 105.
[0021]
As described above, since the plurality of wireless communication units 102 and 103 can perform communication using different wireless communication methods, the PC 101 can simultaneously communicate with a plurality of wireless information communication terminals using different wireless communication methods. And
[0022]
Note that the PC 101 is a notebook PC having a plurality of wireless communication units as described above, but is not limited to this, and may be a desktop PC or other wireless information communication terminal. Further, the printer 104 and the PC 106 may have a plurality of wireless communication units, similarly to the PC 101.
[0023]
FIG. 2 is a block diagram showing a schematic configuration of the wireless information communication terminal in FIG.
[0024]
2, the PC 101 includes a first wireless communication unit 102 (the wireless communication unit 102 in FIG. 1), a second wireless communication unit 103 (the wireless communication unit 103 in FIG. 1), and a communication state monitoring unit 206. Prepare.
[0025]
The first wireless communication unit 102 has an antenna 203 for transmitting and receiving RF signals, and the second wireless communication unit 103 similarly has an antenna 212 for transmitting and receiving RF signals. The first wireless communication unit 102 and the second wireless communication unit 103 exchange transmission / reception signals with respective communication partners in a time-division (TDD) manner.
[0026]
The PC 106 includes a third wireless communication unit 107 (the wireless communication unit 107 in FIG. 1) that communicates with the first wireless communication unit 102, an antenna 209 that transmits and receives an RF signal by TDD, a communication state monitoring unit 210, Is provided. The printer 104 includes a fourth wireless communication unit 105 (the wireless communication unit 105 in FIG. 1) that communicates with the second wireless communication unit 103, an antenna 213 that transmits and receives an RF signal by TDD, and a communication state monitoring unit 214. And
[0027]
The communication state monitoring unit 206 sequentially monitors the communication states of the first wireless communication unit 102 and the second wireless communication unit 103, and indicates the communication states of the first wireless communication unit 102 and the second wireless communication unit 103. The communication state monitoring information is stored in a storage unit (not shown). Thereby, the first wireless communication unit 102 can always know the communication state of the second wireless communication unit 103 by the communication state monitoring unit 206, and the second wireless communication unit 103 The communication state of the first wireless communication unit 102 can always be known.
[0028]
The communication status monitoring unit 206 transmits communication status monitoring information indicating the communication status of a communication partner such as the third wireless communication unit 107 in the PC 106 and the fourth wireless communication unit 105 in the printer 104 from the PC 106 and the printer 104, respectively. get.
[0029]
The communication state monitoring unit 210 constantly monitors the communication state of the third wireless communication unit 107. The PC 106 transmits the communication status monitoring information indicating the communication status of the third wireless communication unit 107 acquired by the communication status monitoring unit 210 to the PC 101 in response to a request from the PC 101 that is the communication partner.
[0030]
The communication state monitoring unit 214 constantly monitors the communication state of the fourth wireless communication unit 105. The printer 104 transmits the communication status monitoring information indicating the communication status of the fourth wireless communication unit 105 acquired by the communication status monitoring unit 214 to the PC 101 in response to a request from the PC 101 that is the communication partner.
[0031]
FIG. 3 is a schematic diagram showing communication state monitoring information stored in the communication state monitoring unit 206 of FIG.
[0032]
In FIG. 3, the communication status monitoring unit 206 includes, as communication status monitoring information, information indicating the communication status of the first wireless communication unit 102 and the second wireless communication unit 103 and the communication status of the PC 106 that is the communication partner of the PC 101. Information indicating the communication state of the third wireless communication unit 107 and the fourth wireless communication unit 105 in the printer 104 is stored.
[0033]
For example, the information indicating the communication state of the first wireless communication unit 102 includes transmission output information, transmission frequency information, transmission / reception state information of the first wireless communication unit 102 to a communication partner, and reception quality information of the communication partner. Communication quality information such as S / N information and reception BER information, reception S / N information as its own reception quality information for a transmission signal from a communication partner of the first wireless communication unit 102, and communication quality information such as reception BER information Are stored.
[0034]
Similarly, information indicating the communication state of the second wireless communication unit 103 includes transmission output information to the communication partner of the second wireless communication unit 103, transmission frequency information, transmission / reception state information, and reception quality information of the communication partner. Communication quality information such as reception S / N information and reception BER information, and communication quality such as reception S / N information and reception BER information as own reception quality information for a transmission signal from a communication partner of the second wireless communication unit 103 Information is stored.
[0035]
In addition, communication quality information is stored as information indicating the communication state of the third wireless communication unit 107, and communication quality information is stored as information indicating the communication state of the fourth wireless communication unit 105.
[0036]
Next, an output control method of wireless communication of the first wireless communication unit 102 in FIG. 2 will be specifically described.
[0037]
FIG. 4 is a block diagram showing an internal configuration of the second wireless communication unit 103 in FIG. Note that the first wireless communication unit 102 has the same configuration as the third wireless communication unit 107, and the second wireless communication unit 103 has the same configuration as the fourth wireless communication unit 105. In the present embodiment, the wireless units (the second wireless communication unit 103 and the fourth wireless communication unit 105) that perform frequency hopping communication based on the Bluetooth standard will be described with reference to FIG. The description of the radio unit that performs the direct spreading method conforming to the standard is omitted.
[0038]
In FIG. 4, an antenna 203 receives an RF signal in a frequency band (2402 to 2480 MHz) used in the Bluetooth (BT) standard from the air, and transmits an RF signal in a frequency band similarly used in the BT standard. Things. The transmission / reception switching unit 502 performs transmission / reception switching according to the TDD scheme performed in the BT standard.
[0039]
First, the reception path will be described.
[0040]
The low noise amplifier 503 amplifies the BT RF signal received by the antenna 203 to a desired level, and is configured by an amplifier having a noise figure (NF) as low as possible. The first band-pass filter 504 removes unnecessary components outside the operating frequency band of the BT generated when the low-noise amplifier 503 amplifies the RF signal received by the antenna 203. The frequency conversion section 505 multiplies the LO signal output from the local transmission section 506 by the output signal from the first bandpass filtering section 504 to convert the LO signal into a desired low-frequency IF signal. This facilitates the digital processing of the signal in the demodulation unit 507 described later.
[0041]
The second bandpass filter 517 removes unnecessary components outside the used frequency band in the desired IF signal generated by the non-linear operation of the frequency converter 505 at the preceding stage. That is, the second band filtering section 517 removes unnecessary components of the desired IF signal, thereby maintaining the S / N of the IF signal in a good state, and S / N of the input signal to the demodulation section 507 at the subsequent stage. N can be sufficiently secured.
[0042]
The demodulation unit 507 performs a demodulation operation of FSK (frequency shift keying), and supplies a demodulated digital signal to the control unit 509.
[0043]
The control unit 509 performs desired data processing on the digital signal supplied from the demodulation unit 507 to generate demodulated data, outputs the demodulated data to an external I / F (not shown), or temporarily stores the demodulated data in a storage unit (not shown). To memorize. Also, the control unit 509 extracts communication quality information of the third wireless communication unit 107, which is a communication partner of the first wireless communication unit 102, from the demodulated data and sends out the communication quality information to the communication state monitoring unit 206. The information is stored in the storage unit in the communication state monitoring unit 206 as communication quality information 519 of the communication unit.
[0044]
Next, the transmission path will be described.
[0045]
The control unit 509 sends transmission data from an external I / F (not shown) to the primary modulation unit 512. Primary modulation section 512 generates a primary modulation signal by an FSK (frequency shift keying) modulation operation. The frequency band of the primary modulation signal generated by the primary modulation section 512 is determined by the data rate of the digital signal to be transmitted, and is, for example, about 1 MHz.
[0046]
The primary modulation signal from primary modulation section 512 is sent to frequency conversion section 513, and is multiplied by the LO signal output from local oscillation section 506, so as to be converted into one wave in a desired frequency band (2402 to 2480 MHz). It is up-converted as an RF signal. Here, the local transmission unit 506 normally has a PLL (Phase Locked Loop) configuration, and is configured to lock to a desired frequency by external frequency setting data.
[0047]
In the case of the BT standard, a hopping frequency pattern is determined when a communication connection establishing operation is performed. The hopping pattern generation unit 510 in the control unit 509 transmits data for determining the transmission frequency to the local transmission unit 506. Local transmission section 506 locks at high speed to the frequency corresponding to the data transmitted from hopping pattern generation section 510.
[0048]
The RF signal up-converted by the frequency conversion unit 513 is power-amplified to a desired level by a power amplification unit 514, and a third band filtering unit 516 removes a harmonic component. The light is radiated from the antenna 203 into the air.
[0049]
The second wireless communication unit 103 performs a wireless communication connection establishment operation with the fourth wireless communication unit 105 that is a communication partner of the second wireless communication unit 103, and then performs a transmission operation to the fourth wireless communication unit 105 before performing a transmission operation to the fourth wireless communication unit 105. The transmission / reception state of the first wireless communication unit 102 disposed in the same housing as the second wireless communication unit 103 is obtained from the transmission / reception state information 520 of the first wireless communication unit stored in the communication state monitoring unit 206 Then, it is determined whether or not the first wireless communication unit 102 is performing communication. When the first wireless communication unit 102 is performing communication, the second wireless communication unit 103 uses the first frequency band information 521 of the first wireless communication unit stored in the communication state monitoring unit 206 to determine the first frequency. The frequency band used by the wireless communication unit 102 is recognized.
[0050]
Next, before starting the transmission operation, the second wireless communication unit 103 compares the transmission frequency it is trying to transmit and the frequency band used by the first wireless communication unit 102 with the hopping frequency comparison unit 511. When it is determined that the own transmission frequency is included in the frequency band used in the first wireless communication unit 102, the hopping frequency comparison unit 511 outputs a frequency match signal to the output control unit 515. , And data for causing desired attenuation is transmitted from the output control unit 515 to the power amplification unit 514. Power amplifying section 514 reduces the transmission output of second wireless communication section 103 by performing an operation of attenuating or reducing the amplification factor according to the data. Accordingly, the second wireless communication unit 103 can reduce the transmission output only in the frequency band used by the first wireless communication unit 102.
[0051]
As a result of monitoring by the communication state monitoring unit 206, when the first wireless communication unit 102 is not performing communication, the second wireless communication unit 103 transmits at the maximum output without performing the above-described transmission output control. On the other hand, as a result of monitoring by the communication state monitoring unit 206, the first wireless communication unit 102 is performing communication, and the transmission / reception state information of the first wireless communication unit stored in the communication state monitoring unit 206 Similarly, when the first wireless communication unit 102 is in the transmission state from 520, the transmission is performed at the maximum output without controlling the transmission output of the second wireless communication unit 103.
[0052]
Next, interference avoidance control of wireless communication between the first wireless communication unit 102 and the second wireless communication unit 103 in the PC 101 in FIG. 1 will be described with reference to FIG. In FIG. 1, the first wireless communication unit 102 is a wireless communication unit compliant with IEEE802.11, and the second wireless communication unit 103 is a wireless communication unit compliant with the Bluetooth standard. Further, the third wireless communication unit 107 is a wireless communication unit conforming to IEEE802.11 similarly to the first wireless communication unit 102, and the fourth wireless communication unit 105 is similar to the second wireless communication unit 103. , A wireless communication unit conforming to the Bluetooth standard.
[0053]
The first wireless communication unit 102 and the third wireless communication unit 107 perform communication by a wireless communication method using a direct spreading method. In the wireless communication system using the direct spreading method, a bandwidth of about 20 MHz in a frequency band of 2402 to 2480 MHz is always occupied as a transmission / reception band, and the used frequency band may be shifted to another frequency band.
[0054]
Further, the second wireless communication unit 103 and the fourth wireless communication unit 105 perform communication by a wireless communication system using a frequency hopping system. In the radio communication system based on the frequency hopping system, a frequency band of 2402 to 2480 MHz is used at an interval of 1 MHz, and 79 channels (ch) are occupied by a certain hopping pattern at a time interval of 1ch every 625 μs with a certain hopping pattern. I do.
When the first communication unit 102 establishes a communication connection with the third communication unit 107 of the same wireless communication system as a communication partner and performs data communication, for example, the first communication unit 102 may be in the same housing as the first wireless communication unit 102. When the second communication unit 103 of a different wireless communication scheme has established communication with the fourth wireless communication unit 105, the first wireless communication unit 103 has a certain probability within its used frequency band (BW1). The transmission frequency of 102 jumps in.
[0055]
At this time, since the third wireless communication unit 107, which is performing communication with the first wireless communication unit 102, keeps a certain distance from the second wireless communication unit 103, the interference wave power based on the transmission frequency is reduced. Although the level does not cause any problem, when the first wireless communication unit 102 incorporated in the same housing is in the receiving state, the level of the interference wave power becomes considerable, and noise power is applied to the receiving end of the first wireless communication unit 102. Mixing and degrades the reception S / N.
[0056]
Therefore, the second wireless communication unit 103 captures the used frequency band information of the first wireless communication unit 102 from the communication state monitoring information stored in the communication state monitoring unit 206, and limits the use frequency band to the used frequency band. Thus, the transmission output of the second wireless communication unit 103 is reduced. That is, the second wireless communication unit 103 fetches communication state monitoring information from the communication state monitoring unit 206 as to whether the first wireless communication unit 102 is in the communication state or, if communicating, in the reception state. It recognizes whether the first wireless communication unit 102 is in the communication state and is in the receiving state during communication, and sets the transmission output of the second wireless communication unit 103 to the frequency band used by the first communication unit 102. Control is performed so that the transmission output is reduced in a limited manner and the interference power applied to the first wireless communication unit 102 is reduced.
[0057]
At this time, the second wireless communication unit 103 controls the transmission output while also referring to the reception quality information of the fourth wireless communication unit 105 that is a communication partner of the same wireless communication scheme. That is, when the communication quality of the fourth wireless communication unit 105 is equal to or higher than the desired level, the transmission output of the second wireless communication unit 103 is limited to the frequency band used by the first wireless communication unit 102. In a frequency band other than the frequency band used by the first wireless communication unit 102, the output is controlled at the maximum output without performing output control.
[0058]
Next, a connection procedure of wireless communication between the second wireless communication unit 103 and the fourth wireless communication unit 105 as a communication partner in FIG. 2 will be described with reference to FIGS.
[0059]
FIG. 5 is a flowchart showing a wireless communication connection procedure by the second wireless communication unit 103 in FIG. 5 and 6 show a case where communication is performed with the second wireless communication unit 103 serving as a master and the fourth wireless communication unit 105 serving as a slave.
[0060]
In FIG. 5, when the power of the second wireless communication unit 103 is turned on (power ON) in step S602, a predetermined program is started in step S603 to start wireless communication. Subsequently, an inquiry request is transmitted to a wireless information communication terminal existing around the second wireless communication unit 103 and having the same wireless communication system as the second wireless communication unit 103 (step S604), and the inquiry is made. Wait for a response to the request.
[0061]
Next, it is determined whether or not there is a response from the surrounding wireless information communication terminal to the inquiry request made in step S604 (step S605). If there is a response (YES in step S605), a response is made. A wireless communication connection is established with the wireless information communication terminal, for example, the fourth wireless communication unit 105 in the printer 104 (step S606). On the other hand, when there is no response (NO in step S605), it is determined that there is no connectable wireless information communication terminal near the second wireless communication unit 103, and the process ends.
[0062]
Next, in step S607, data to be transmitted to the printer 104 is input from the external IF, and it is determined whether there is a transmission request to transmit the data to the printer 104. In step S608, it is determined whether or not there is a transmission request. If there is no transmission request (NO in step S608), the process returns to step S607 and the transmission request waiting operation is performed again. On the other hand, if there is a transmission request (YES in step S608), the operation enters a transmission output control operation, and communication of another wireless communication unit existing in the same housing, that is, the first wireless communication unit 102, before transmitting data. The status information 518 (FIG. 4) is fetched from the communication status monitoring unit 206, and a transmission output control process is performed according to the communication status of the first wireless communication unit 102 (step S609). After the transmission output control operation ends, data transmission starts (step S610), and the process proceeds to step S611.
[0063]
Next, in step S611, it is determined whether or not the data transmission has been completed. If the data transmission has not been completed (NO in step S611), the process returns to step S607 to perform a transmission request holding operation. On the other hand, as a result of the determination in step S611, when the data transmission is completed (YES in step S611), the wireless communication connection with the fourth wireless communication unit 105 is stopped, and the communication with the fourth wireless communication unit 105 is stopped. Is disconnected (step S612), and this process ends.
[0064]
FIG. 6 is a flowchart showing a wireless communication connection procedure by the fourth wireless communication unit 105 in FIG.
[0065]
6, first, when the power of the fifth wireless communication unit 105 is turned on (power ON) in step S702, a predetermined program is started in step S703 to start wireless communication. Subsequently, in step S704, the operation enters an inquiry request waiting operation from the master second wireless communication unit 103, and waits for an inquiry request.
[0066]
In step S705, it is determined whether or not an inquiry request has been received from another wireless information communication terminal such as the second wireless communication unit 103. If an inquiry request has not been received (NO in step S705), the process returns to step S705. The process returns to step S704 to enter an inquiry request waiting operation. On the other hand, when an inquiry request is received (YES in step S705), an inquiry response notification is transmitted to second wireless communication unit 103 in step S706.
[0067]
In step S707, when the result of the transmitted inquiry response notification is received from the second wireless communication unit 103, it is determined whether the result is OK. As a result of this determination, if the result of the inquiry response notification from the second wireless communication unit 103 is not OK (NO in step S707), the process returns to step S704 again to wait for the inquiry request from the second wireless communication unit 103. Do. On the other hand, if the result of the inquiry response notification is OK (YES in step S707), a wireless communication connection is established based on an instruction from second wireless communication section 103, and a transmission request from second wireless communication section 103 is transmitted. Is received (step S709), the communication quality information is transmitted to the second wireless communication unit 103 as the reception quality information of the data received so far from the second wireless communication unit 103 (step S710).
[0068]
Next, in step S711, it is determined whether or not data has been received from the second wireless communication unit 103. If data has not been received (NO in step S711), the flow advances to step S714 to perform second wireless communication. The wireless communication connection with the communication unit 103 is stopped, and the process ends. On the other hand, when data has been received (YES in step S711), desired data processing is performed (step S712). Subsequently, in step S713, it is determined whether or not the data reception has been completed. If the data reception has not been completed (NO in step S713), the process returns to step S711 again to perform the data reception waiting operation. On the other hand, when the data reception ends (YES in step S713), the process of step S714 is performed, and the process ends.
[0069]
Next, the transmission output control processing in step S609 of FIG. 5 will be described in detail with reference to FIG.
[0070]
FIG. 7 is a flowchart showing the transmission output control process in step S609 of FIG.
[0071]
This processing is performed by the first wireless communication unit 103 installed in the same housing before the second wireless communication unit 103 completes the establishment of wireless communication connection with the fourth wireless communication unit 105 and performs data transmission or the like. The determination as to whether or not the wireless communication unit 102 is currently communicating is performed by taking in communication state monitoring information indicating the communication state of the first wireless communication unit 105 from the communication state monitoring unit 206.
[0072]
In FIG. 7, in step S402, it is determined whether the first wireless communication unit 102 in the PC 101 is communicating or not. If the first wireless communication unit 102 is not communicating (NO in step S402), step S409 is performed. Proceed to. On the other hand, when the first wireless communication unit 102 is communicating (YES in step S402), the use frequency band information 521 of the first wireless communication unit is fetched from the communication state monitoring unit 206 in step S403. Here, the use frequency band (referred to as BW1) of the first wireless communication unit 102 located in the same housing as the second wireless communication unit 103 is determined.
[0073]
Next, in step S404, it is determined whether the first wireless communication unit 102 is transmitting. If the result of this determination is that the first wireless communication unit 102 is transmitting (YES in step S404), the process proceeds to step S409, while if the first wireless communication unit 102 is receiving instead of transmitting. (NO in step S404), in step S405, it is determined whether the reception quality state of first wireless communication unit 102, that is, the communication quality state is good. If the result of this determination is that the communication quality state of the first wireless communication unit 102 is good (YES in step S405), the flow proceeds to step S409.
[0074]
Further, even when the communication quality state of the first wireless communication unit 102 is equal to or higher than the desired level in step S405, the processing after step S409 is performed.
[0075]
As a result of the determination in step S405, when the communication quality state of the first wireless communication unit 102 is not good (NO in step S405), the transmission output in the used frequency band of the second wireless communication unit 103 is adjusted ( Step S406). That is, the transmission output of the second wireless communication unit 103 is reduced to a desired level. At this time, the frequency band for reducing the transmission output is the frequency band used for the communication of the first wireless communication unit 102 recognized in step S403, and is limited to only this frequency band (BW1). Of the wireless communication unit 103 to a desired level.
[0076]
Next, in step S407, it is determined whether the communication quality of the first wireless communication unit 102 has become good. If the communication quality of the first wireless communication unit 102 is not good (NO in step S407), Returning to step S406, the transmission output of the second wireless communication unit 103 is again reduced to a desired transmission level. Subsequently, steps S406 and S407 are repeated for a certain period.
[0077]
If the communication quality of the first wireless communication unit 102 becomes good as a result of the determination in step S407 (YES in step S407), the process proceeds to step S408, in which the fourth wireless communication unit 103 is the fourth communication partner. With reference to the reception quality state received from the wireless communication unit 105, it is determined whether the reception quality state of the fourth wireless communication unit 105, that is, the communication quality state is good and equal to or higher than a desired level.
[0078]
As a result of the determination in step S408, when the communication quality state of the fourth wireless communication unit 105 is good and equal to or higher than the desired level (YES in step S408), the process returns. On the other hand, if the communication quality state of the fourth wireless communication unit 105 is not good (NO in step S408), the process proceeds to step S411, where the transmission output of the second wireless communication unit 103 is recognized in step S405. The operation is limited to the frequency band used by the communication unit 102, the transmission operation in that frequency band is stopped, and the process returns.
[0079]
In step S409, it is determined whether or not the transmission output of the second wireless communication unit 103 is the maximum. If the transmission output is not the maximum output (NO in step S409), the transmission output of the second wireless communication unit 103 is maximized. When the second wireless communication unit 103 has the maximum output (YES in step S409), the process returns (step S410).
[0080]
According to the above embodiment, the PC 101 stores the communication states of the first wireless communication unit 102 and the second wireless communication unit 103 as communication state monitoring information, and stores the first wireless communication unit in the communication state monitoring information. Since the transmission output of the second wireless communication unit 103 is controlled according to the communication state of the second wireless communication unit 102, the first wireless communication unit 102 and the second wireless communication unit 103 use a plurality of wireless communication systems different from each other in the same housing. Accordingly, even when communication is performed simultaneously in the same frequency band, interference of mutual communication can be reduced.
[0081]
In addition, by limiting the frequency band in which the second wireless communication unit 103 performs transmission output control to the frequency band used by the first wireless communication unit 102, the frequency band outside the used frequency band of the first wireless communication unit 102 is used. Since it is not necessary to reduce the transmission output of the second wireless communication unit 103 and it is possible to perform transmission at the maximum output, it is possible to minimize the deterioration of the communication quality state of the second wireless communication unit 103. It is possible at the same time.
[0082]
The present invention is not limited to the above embodiment. For example, in FIG. 4, the output control unit 515 receives the frequency coincidence signal from the hopping frequency comparison unit 511, recognizes that the transmission frequency is in the frequency band used by the first wireless communication unit 102, and performs power amplification. Although the configuration is such that the output of the RF signal from the unit 514 is controlled, the control target of the output control unit 515 is not limited to the power amplification unit 514, and the output of the IF signal from the primary modulation unit 512 is controlled. You may.
[0083]
Further, an attenuation means may be arranged before or after the power amplification section 514 without controlling the amplification rate of the power amplification section 514, and the attenuation rate of the attenuation means may be controlled.
[0084]
The present invention supplies a software program (a program corresponding to the flowcharts in FIGS. 5 to 7) for realizing the functions of the above-described embodiments to a computer or a CPU, and the computer or the CPU executes the supplied program. Needless to say, the object of the present invention can be achieved by reading and executing. In this case, the program is supplied by being downloaded directly from a storage medium storing the program, or from another computer or database (not shown) connected to the Internet, a commercial network, a local area network, or the like.
[0085]
Further, the program only needs to be able to realize the functions of the above-described embodiments by a computer, and the form includes object code, a program executed by an interpreter, script data supplied to an OS, and the like. May be.
[0086]
Further, the present invention can also be realized by supplying a storage medium storing a software program for realizing the functions of the above-described embodiments to a computer, and the computer or CPU reading and executing the program stored in the storage medium. It goes without saying that the above object is achieved.
[0087]
In the above-described embodiment, the program is stored in the ROM (not shown). However, the present invention is not limited to this. Examples of the storage medium that supplies the program include a RAM, an NV-RAM, a hard disk, a flexible disk, Optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic tape, non-volatile memory card, other ROM, etc. What is necessary is just a thing which can memorize.
[0088]
Examples of embodiments of the present invention are listed below.
[0089]
Embodiment 1 In a wireless information communication terminal including first wireless communication means and second wireless communication means operating in the same frequency band using different wireless communication schemes, the first wireless communication means Communication status monitoring means for monitoring the communication status of the second wireless communication means, communication status monitoring information storage means for storing the communication status as communication status monitoring information, and communication status monitoring information based on the stored communication status monitoring information. And a transmission output control means for controlling transmission output of one of the first wireless communication means and the second wireless communication means.
[0090]
[Embodiment 2] The communication state monitoring means includes, as the communication state monitoring information, transmission output information, transmission / reception frequency information, transmission / reception frequency band of the first wireless communication means and the second wireless communication means. The wireless information communication terminal device according to the first embodiment, wherein information, transmission / reception timing information, and reception quality information are monitored respectively.
[0091]
[Embodiment 3] The transmission output control means is stored in the communication state monitoring information storage means for one of the first wireless communication means and the second wireless communication means for controlling the transmission output. A transmission output limited to the other transmission / reception frequency band based on at least one of transmission frequency information and transmission frequency band information of the other one of the first radio communication means and the second radio communication means. The wireless information communication terminal according to embodiment 2, wherein the wireless information communication terminal performs control.
[0092]
[Embodiment 4] The other wireless information communication terminal that is a communication partner with respect to one of the first wireless communication unit and the second wireless communication unit that controls the transmission output. While maintaining the communication quality of a desired level or more while referring to the reception quality information of the other and the reception quality information of the other of the first wireless communication means and the second wireless communication means, The wireless information communication terminal according to the second embodiment, wherein the transmission output control is limited to a received signal frequency band.
[0093]
[Embodiment 5] The transmission output control means is stored in the communication state monitoring information storage means for one of the first wireless communication means and the second wireless communication means for controlling the transmission output. Based on the transmission / reception timing information of the other of the first wireless communication means and the second wireless communication means, and only when the other is in a reception state, is limited to the other transmission / reception frequency band. The wireless information communication terminal according to the second embodiment, wherein the wireless information communication terminal performs the transmission output control described above.
[0094]
[Sixth Embodiment] The transmission output control means is stored in the communication state monitoring information storage means for one of the first wireless communication means and the second wireless communication means for controlling the transmission output. Based on transmission / reception timing information of the other one of the first wireless communication means and the second wireless communication means, does not perform transmission output control when the other is in the transmission state, and outputs the transmission output to the maximum output The wireless information communication terminal according to the second embodiment, wherein the wireless information communication terminal transmits the information.
[0095]
[Seventh Embodiment] The transmission output control means may be a communication partner of another of the wireless information communication terminals with respect to one of the first wireless communication means and the second wireless communication means for controlling the transmission output. Only when the communication quality of the first wireless communication means and the second wireless communication means is in a receiving state when the communication quality is equal to or lower than a desired level, the transmission limited to the other transmission / reception frequency band. The wireless information communication terminal according to the second embodiment, wherein the wireless information communication terminal does not perform the communication.
[0096]
[Eighth Embodiment] At least one of the first wireless communication unit and the second wireless communication unit is a wireless communication unit conforming to the Bluetooth standard, wherein one of the first to seventh embodiments is characterized in that: A wireless information communication terminal according to claim 1.
[0097]
[Embodiment 9] At least one of the first wireless communication unit and the second wireless communication unit is a wireless communication unit compliant with IEEE802.11b. The wireless information communication terminal according to the aspect.
[0098]
[Embodiment 10] In a control method of a wireless information communication terminal including first wireless communication means and second wireless communication means operating in the same frequency band using mutually different wireless communication schemes, A communication state monitoring step of monitoring communication states of the wireless communication unit and the second wireless communication unit, a communication state monitoring information storing step of storing the communication state as communication state monitoring information, and the stored communication state monitoring A transmission output control step of controlling a transmission output of one of the first wireless communication unit and the second wireless communication unit based on information.
[0099]
[Embodiment 11] A program for causing a computer to execute a control method of a wireless information communication terminal including first wireless communication means and second wireless communication means operating in the same frequency band using mutually different wireless communication schemes , The program comprises: a communication state monitoring step of monitoring communication states of the first wireless communication unit and the second wireless communication unit; and a communication state monitoring information storage unit storing the communication state as communication state monitoring information. And a transmission output control step of controlling a transmission output of one of the first wireless communication unit and the second wireless communication unit based on the stored communication state monitoring information. Program to do.
[0100]
【The invention's effect】
As described above in detail, according to the present invention, the communication states of the first wireless communication unit and the second wireless communication unit operating in the same frequency band using different wireless communication systems are set to the communication state. It is stored as monitoring information, and the transmission output of one of the first wireless communication means and the second wireless communication means is controlled based on the communication state monitoring information. Even when communication is performed simultaneously on a band, interference between the communication can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of a system including a wireless information communication terminal according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating a schematic configuration of a wireless information communication terminal in FIG. 1;
FIG. 3 is a schematic diagram illustrating communication state monitoring information stored in a communication state monitoring unit 206 of FIG. 2;
FIG. 4 is a block diagram showing an internal configuration of a second wireless communication unit 103 in FIG.
FIG. 5 is a flowchart showing a wireless communication connection procedure by a second wireless communication unit 103 in FIG. 2;
FIG. 6 is a flowchart showing a connection procedure of wireless communication by a fourth wireless communication unit 105 in FIG. 2;
FIG. 7 is a flowchart showing a transmission output control process in step S609 of FIG. 5;
[Explanation of symbols]
101,106 wireless information communication terminals
102 first wireless communication unit
103 second wireless communication unit
104 Printer
105 fourth wireless communication unit
107 third wireless communication unit
206, 210, 214 Communication state monitoring unit
509 control unit
511 Hopping frequency comparison unit
514 Power amplifier
515 Output control unit

Claims (1)

  1. In a wireless information communication terminal including a first wireless communication unit and a second wireless communication unit using different wireless communication systems and operating in the same frequency band,
    Communication state monitoring means for monitoring communication states of the first wireless communication means and the second wireless communication means, respectively;
    Communication state monitoring information storage means for storing the communication state as communication state monitoring information,
    Wireless information comprising transmission output control means for controlling the transmission output of one of the first wireless communication means and the second wireless communication means based on the stored communication state monitoring information. Communication terminal.
JP2003157190A 2003-06-02 2003-06-02 Wireless information communication terminal Withdrawn JP2004363728A (en)

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WO2005117279A1 (en) * 2004-05-28 2005-12-08 Matsushita Electric Industrial Co., Ltd. Wireless communication apparatus and communication quality estimating method
JP2006352820A (en) * 2005-05-19 2006-12-28 Alps Electric Co Ltd Radio communication method and information management apparatus
JP2007166470A (en) * 2005-12-16 2007-06-28 Sony Computer Entertainment Inc Communication terminal device and transmission power control method
JP2007214819A (en) * 2006-02-08 2007-08-23 Toshiba Corp Wireless communication device and wireless communication method
JP2007288378A (en) * 2006-04-14 2007-11-01 Fujitsu Broad Solution & Consulting Inc Data communication program, data communication method and mobile terminal device
JP2008521309A (en) * 2004-11-22 2008-06-19 ノキア コーポレイション Method and apparatus for controlling wireless access
JP2008219199A (en) * 2007-02-28 2008-09-18 Brother Ind Ltd Communication apparatus and communication system
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JP2009510870A (en) * 2005-11-24 2009-03-12 ノキア コーポレイション Radio frequency identification (RFID) communication subsystem and method, module, terminal and system for enabling scheduled operation of a radio communication subsystem
JP2009514433A (en) * 2005-10-31 2009-04-02 インテル コーポレイション Method and apparatus for providing a platform coexistence system for a plurality of wireless communication devices
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WO2005117279A1 (en) * 2004-05-28 2005-12-08 Matsushita Electric Industrial Co., Ltd. Wireless communication apparatus and communication quality estimating method
US7991413B2 (en) 2004-11-11 2011-08-02 Nokia Corporation Method and device for controlling radio access
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JP2007288378A (en) * 2006-04-14 2007-11-01 Fujitsu Broad Solution & Consulting Inc Data communication program, data communication method and mobile terminal device
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US8989811B2 (en) 2009-06-24 2015-03-24 Kabushiki Kaisha Toshiba Wireless communication apparatus with physical layer processing module and MAC layer processing module and its communication method
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