JPH06314983A - Radio communication system with communication frequency band automatic selecting function - Google Patents

Abstract

PURPOSE:To keep communication quality of a system to an excellent state automatically in which two pieces of specific small power radio communication equipment whose 43OMHz and 450MHz bands, e.g. are switched to either of transmission and reception, are communicated. CONSTITUTION:A controller 02 of two-communication equipment 100 at line connection sets a frequency band of 430MHz for transmission reception to control input terminals 22,24 of a radio communication equipment 01, sends reception level comparison data to an opposite equipment via a transmission data input terminal 21 and receives a level of reception data of 430MHz from the opposite equipment from a terminal 34 and stores the data to a RAM 37. Then the controller 02 sets a frequency band of 450MHz for transmission reception similarly to above and stores reception data level for 450MHz band from the opposite equipment. Then the two storage levels are compared and a higher level is selected for a reception frequency band of a concerned equipment and the data of result of selection are sent to the opposite equipment via the input terminal 21. Then the usual communication is entered at the frequency band of the transmission reception to be selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system having a function of automatically switching and selecting a frequency band used for transmission and reception, which is composed of a specific low power wireless communication device. In the drawings below, the same reference numerals indicate the same or corresponding parts.

[0002]

2. Description of the Related Art In a conventional low power wireless communication device, for example, the frequency bands for transmission and reception are determined in advance when the device is designed and manufactured. Further, even in a specific low-power wireless communication device in which the frequency band can be switched, the user determines the frequency band before the wireless station is opened.

[0003]

As described above, in the conventional wireless communication device, the transmission frequency band and the reception frequency band of the wireless communication device are determined when the wireless communication device is purchased and cannot be changed. Therefore, in a wireless communication device system in which two frequency bands are specified, for example, in the case of a wireless device using one frequency band, a wireless communication device using the upper frequency band is a wireless communication device using the upper frequency band and a lower frequency band. The wireless communication devices used can only connect to the wireless communication devices using the lower frequency band.

In the case of a wireless communication device using two frequency bands,
In a wireless communication device that uses the upper frequency band for transmission and the lower frequency band for reception, only the wireless communication device that receives the upper frequency band and uses the lower frequency band for transmission, and vice versa. A wireless communication device that uses the upper frequency band for reception and the lower frequency band for transmission can only connect to a wireless communication device that uses the upper frequency band for transmission and the lower frequency band for reception. .

Therefore, when the wireless communication system is opened, it is necessary to sufficiently consider the arrangement of the wireless communication devices in advance, and it may not be possible to easily change the arrangement when the arrangement is changed. Further, even in a wireless communication device in which the frequency band can be switched, it is necessary to set the frequency band before opening the wireless communication system, which causes a problem that the user takes time and effort.

Therefore, an object of the present invention is to provide a radio communication system with a communication frequency band automatic selection function that can solve these problems.

[0007]

In order to solve the above-mentioned problems, in the wireless communication system according to claim 1, in accordance with a selection signal (transmission control input signal 22a, reception control input signal 24a, etc.) given from the outside. A wireless communication device (01 or the like) capable of switching and selecting each frequency band of transmission and reception to any one of a plurality of predetermined frequency bands, and this wireless communication in a communication mode different from the normal communication mode. So that two wireless communication devices (100-1, 100-2, etc.) equipped with a controller (02, etc.) that performs communication for determining a transmission / reception frequency band while giving the selection signal to the device can communicate with each other. To do.

According to a second aspect of the present invention, in the wireless communication system according to the first aspect, the controller is in its own side during the communication for determining the frequency band (via the communication frequency band determining means 40 or the like). The wireless communication device for transmitting the reception level comparison data for each frequency band, and the wireless communication device on its own side for receiving the reception level comparison data for each frequency band from the partner wireless communication device, and receiving the received data. The frequency band in which the reception state of the received reception level comparison data is the best is obtained, and the reception frequency band determination data indicating that the frequency band is the reception frequency band of the wireless communication device is given to the wireless communication device on the own side. A frequency determined by the reception frequency band determination data transmitted to the wireless communication device of the other side by causing the wireless communication device of the own side to receive the reception frequency determination data from the wireless communication device of the other side. The frequency band of the reception bands, similarly to the frequency band determined by the receiving frequency band determining data was received giving a selection signal to the frequency band of the transmission is intended to perform normal communication.

Further, in the wireless communication system according to claim 3, in the wireless communication system according to claim 1 or 2, the wireless communication device has transmission band filters (3, 4, etc.) for a plurality of transmission frequency bands. Means for selecting one of the transmission bandpass filters based on the first selection signal (22a etc.) from the outside and connecting it to the antenna (1 etc.) via the distributor (2 etc.) Selection circuit 25
Etc.), a transmitter having means (selection circuit 11 etc.) for selecting a transmission carrier for each frequency band based on the first selection signal and giving it to the modulator (6 etc.), and a plurality of reception frequency bands. Another receiving band-pass filter (12, 13 or the like), selects one of the receiving band-pass filters based on the second selection signal (24a or the like) from the outside, and sends it to the antenna via the distributor. And a receiver having a means for connecting (such as the reception filter selection circuit 26).

Further, in the wireless communication system according to claim 4, the wireless communication system according to any one of claims 1 to 3 is adapted to perform specific low power wireless communication.

[0011]

A wireless communication device comprising a wireless communication device capable of transmitting and receiving in two frequency bands and a controller capable of switching the frequency band used by this communication device is used. Communication of data for frequency band determination is performed between two frequency bands. Then, in each wireless communication device, the reception level is checked in two frequency bands, and which frequency band is used for reception is determined. Then, the determined reception frequency band is communicated with the other party.
As a result, the reception frequency band of each wireless communication device is determined, and the transmission frequency band is also automatically determined. After that, normal communication is performed using the determined frequency band.

Further, even during the normal communication using the frequency band determined by the above-mentioned communication, the same frequency band communication operation as described above is performed at any time or when necessary, so that the frequency band is determined. It is possible to switch automatically. In this way, the wireless communication device automatically determines the frequency band used for transmission and reception when the line is connected, so that the user of the device does not need to be particularly aware of the communication frequency band. Further, by performing the frequency band determining operation even during the communication operation, it is possible to always perform communication using the frequency band having the better communication state, so that it is possible to prevent deterioration of communication quality.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a specific low power wireless communication device will be described, but the present invention is not limited thereto.
FIG. 1 shows the configuration of a specific low-power wireless communication device 100 as an embodiment of the present invention. In the figure, 01 is a wireless communication device, 02 is a controller that controls the wireless communication device 01 via an internal interface 03, and 04 is this wireless communication device 100.
And a user interface for connecting an external user device.

Next, 21 to 24, 29, and 34 are terminals on the side of a wireless communication device 01, which will be described later, which constitute the internal interface 03, 21 is a transmission data input terminal, 22 is a transmission control input terminal, and 23 is a reception data output terminal. , 24 is a reception control input terminal, 29 is a channel selection command input terminal, and 34 is a reception level output terminal. In the controller 02, 35
Is C such as a microcomputer for performing control operation
PU, 36 is a ROM containing a control operation program, 37
Is a RAM as a data memory, 38 is a CPU 35, R
It is a bus for connecting the OM 36 and the RAM 37.

Reference numeral 40 is a CPU 35, a ROM 36, an RA
It is a communication frequency band determining means as a main partial functional part relating to the present invention of the microcomputer system including M37. FIG. 2 shows the internal configuration of the wireless communication device 01. In the figure, 1 is an antenna, 2 is a signal distributor for flowing a signal as shown by an arrow in the drawing, 3 is a transmission band filter for passing a 430 MHz band signal toward the antenna 1 through the distributor 2,
Reference numeral 4 is a transmission bandpass filter that similarly passes a 450 MHz band signal, and 25 (25a, 25b) is a transmission bandpass filter 3 according to a transmission control input signal 22a from the controller 02.
Or a selection circuit for selecting 4, 5 is a power amplifier for transmission, 6 is a modulator which modulates the input transmission carrier with transmission data and gives it to the power amplifier 5, 21 is transmission data for the modulator 6 described in FIG. Input terminal, 7 is 430
PLL frequency synthesizer for creating a transmission carrier in the MHz band, 10 is an oscillator that generates an oscillation wave of 9.95 MHz, 8 is a local oscillation wave for reception by mixing the output of the synthesizer 7 and the output of the oscillator 10, and 450 MHz A mixer for local oscillation for generating a frequency in the previous stage of the band transmission carrier, 27 is a band filter for extracting a component of the 440 MHz band from the output of the mixer 8, and 9 is a mixture of the output of the band filter 27 and the output of the oscillator 10. (Mixing) 450MH
a transmission mixer for creating a z-band transmission carrier, 28
Is a bandpass filter for extracting the 450 MHz band component from the output of the mixer 9, 11 is a 430 MHz band transmission carrier from the synthesizer 7 side or a 450 MHz band transmission carrier from the bandpass filter 28 side according to the transmission control input signal 22a. The selection circuit 22 for outputting is the transmission control input terminal described in FIG. 1 for applying the transmission control input signal 22a to the transmission filter selection circuit 25 and the selection circuit 11.

Next, 12 is a reception band filter that passes a 430 MHz band signal among signals received from the antenna 1 through the distributor 2, 13 is a reception band filter that also passes a 450 MHz band signal, and 26 (26a, 26b). ) Is a selection circuit for selecting the reception band-pass filter 12 or 13 according to the reception control input signal 24a from the controller 02.
Reference numeral 4 is a high-frequency amplifier that amplifies the received wave that has passed through the band filter 12 or 13, and 15 is a mixture of the received frequency from the high-frequency amplifier 14 and the local oscillation wave in the 440 MHz band from the band filter 27 for reception. Frequency is the first intermediate frequency 9.
The first mixer for dropping to 95 MHz, 16 is the first mixer
A first intermediate frequency amplifier for amplifying an intermediate frequency signal, 18 is an oscillator, 17 is an output of the first intermediate frequency amplifier 16 and an output of the oscillator 18, and the reception frequency is a second intermediate frequency. A second mixer for reducing the frequency to 455 KHz, a second intermediate frequency amplifier 19 for amplifying the signal of the second intermediate frequency,
Reference numeral 20 is a detector that detects the output of the amplifier 19 and outputs received data, 23 is the output terminal of the received data described in FIG. 1, and 24 is the reception control input signal 24a to the reception filter selection circuit 26. It is the reception control input terminal described in FIG. Reference numeral 29 is a channel selection signal input terminal described in FIG. 1 for selecting and designating a frequency for each channel created by the PLL frequency synthesizer 7. Reference numeral 34 is the reception level output terminal described in FIG. 1 that outputs the reception voltage level of the reception signal.

3 and 4 are flow charts showing the control operation of the communication frequency band determining means 40 of the controller 02.
24 shows the step. Next, FIGS. 3 and 4 will be described with reference to FIGS. It should be noted that the operations of FIGS. 3 and 4 are performed by two wireless communication devices 100 (the controller 02 thereof) that communicate with each other prior to normal communication, for example, when the power is turned on. In this example, FIG.
When the self apparatus executes the operation of, the partner apparatus also executes the operation of FIG. 3, and similarly, when the self apparatus executes the operation of FIG. 4, the partner apparatus also executes the operation of FIG.

In FIG. 3, when starting the line connection operation, the CPU 35 of the controller 02 first sets "1" to the transmission control input terminal 22 and the reception control input terminal 24 of the wireless communication device 01 and selects the 430 MHz band (S1). ). Next, it waits for reception for a random time (S2). If there is a reception here (S3,
Branch Y), the received signal level is received level output terminal 3
4 is read and stored in the RAM 37 (S4). Next, the partner wireless communication device (the CPU 35 of the controller 02 thereof) sets the data for selecting the frequency band (that is, the data for the signal level comparison) in the transmission data input terminal 21 and transmits it (S5). Next, the CPU 35 of the own device checks whether or not the reception levels for two frequency bands have been stored (S
6) If not completed (branch N), set “0” to the transmission control input terminal 22 and the reception control input terminal 24 (S
7), select the 450 MHz band and return to step S2.

If there is no reception in step S3, the above-mentioned data for frequency band selection is sent to the transmission data input terminal 2
Set to 1, send (S8), wait for reception (S
9). When the data is received, the received signal level is read from the reception level output terminal 34 and stored in the RAM 37 (S
10) and moves to step S6. In step S6, if the reception levels for two frequency bands have been stored (branch Y), the data stored in the RAM 37 is read,
The frequency band from which the reception level is higher is compared (S11), and the frequency band with the higher reception level is stored in the RAM 37 as the reception frequency band of the own device (S1).
2). Next, in FIG. 4, “1” is set to the transmission control input terminal 22 and the reception control input terminal 24, and 430 MHz
Select a belt (S13). Next, it waits for reception for a random time (S14). If there is a reception here, the received signal data (that is, the data indicating the frequency band that the partner device wants to receive)
From the reception data output terminal 23 and stored in the RAM 37 as frequency band determination data transmitted by the device itself (S1).
6). Next, the reception frequency band determination data of the own device is stored in the RAM 3
The data is read from No. 7, is set in the transmission data input terminal 21, and is transmitted (S17). Next, 430MHz band and 450MHz
It is checked whether or not the data indicating the frequency band to be received by the partner device as the reception data for two frequency bands with the band has been stored (S18), and if not (branch N), the transmission control input terminal 22 And reception control input terminal 24
Is set to "0", the 450 MHz band is selected, and the process returns to step S14. If there is no reception in step S15 (branch N), the reception frequency band determination data of the own device is stored in the RAM.
Read from 37 and set to the transmission data input terminal 21,
It transmits (S20) and waits for reception (S21). When the data indicating the frequency band to be communicated with the partner device is received, the received signal data is read from the reception data output terminal 23 and stored in the RAM 37 (S22), and step S18 is performed.
Move on to.

In step S18, when the reception data from the partner device for two frequency bands has been stored (branch Y), the reception frequency band determination data and the transmission frequency band determination data are read from the RAM 37 (S23). Based on the above, "0" or "1" is set to the transmission control input terminal 22 and the reception control input terminal 24, the frequency band used for transmission and reception is determined (S24), and the process is ended.

Even when the normal communication operation is performed, the operation according to the flowcharts of FIGS. 3 and 4 is performed every fixed time or whenever the reception level falls below a fixed value.
The frequency band used can be changed by programming the OM 36. In addition, by automatically changing the frequency band as described above, it is possible to change the frequency band as shown in FIGS.
Communication using the different frequency bands can be freely performed.

In FIG. 5, 100 (100-1, 100-1,
100-2) is a specific low-power wireless communication device that communicates with each other, and FIG.
An example in which a band is selected for communication is shown, and FIG. 2B shows an example in which two communication devices select a 450 MHz band for communication. Further, FIG. 7C shows an example in which the devices 100-1 and 100-2 select and receive the 450 MHz band and the 430 MHz band, respectively, and FIG. 7D shows the devices 100-1 and 100-2 respectively in the 430 MHz band. , 450 MHz band is selected and received.

[0023]

According to the present invention, the wireless communication device compares the reception levels of the transmission data for each frequency band transmitted from the partner device when the line is connected, and automatically determines the frequency band to be used for reception. Further, since the determined reception frequency band is notified to the partner device to determine the transmission / reception frequency band, the user of the device does not need to be particularly aware of the transmission / reception frequency band.

Further, by performing the frequency band determining operation even during the normal communication operation, the communication using the frequency band having the better normal state can be always performed, so that the deterioration of the communication quality can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a main configuration of a specific low power wireless communication device as an embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of the inside of the wireless communication device of FIG.

FIG. 3 is a flowchart showing the operation of the controller of FIG.

4 is a flowchart showing the operation of the controller of FIG. 1 following FIG. 3;

FIG. 5 is a diagram showing combinations of transmission and reception frequency bands selected according to the present invention.

[Explanation of symbols]

01 Wireless communication device 02 Controller 03 Internal interface 04 User interface 1 Antenna 2 Distributor 3 430MHz band transmission band filter 4 450MHz band transmission band filter 5 Power amplifier 6 Modulator 7 PLL frequency synthesizer 8 Station originating mixer 9 For transmission Mixer 10 Oscillator 11 Selection circuit 12 430 MHz band reception band filter 13 450 MHz band reception band filter 14 High frequency amplifier 15 First mixer 16 First intermediate frequency amplifier 17 Second mixer 18 Oscillator 19 Second intermediate frequency amplifier 20 Detector 21 Transmission data input terminal 22 Transmission control input terminal 22a Transmission control input signal 23 Reception data output terminal 24 Reception control input terminal 24a Reception control input signal 25 Transmission filter selection circuit 26 Reception filter selection circuit 27 Band filter 28 Band Band filter 29 channel selection command input terminal 34 reception level output terminal 35 CPU 36 ROM 37 RAM 40 communication frequency determining means 100 (100-1, 100-2) specific low power wireless communication device

Claims (4)

[Claims] 1. A wireless communication device capable of switching and selecting each frequency band for transmission and reception to any one of a plurality of predetermined frequency bands in accordance with a selection signal given from the outside, and a normal communication mode. In another communication mode, two wireless communication devices having a controller for performing communication for determining the transmission / reception frequency band while giving the selection signal to the wireless communication device are made to communicate with each other. Wireless communication system with automatic communication frequency selection function. 2. The wireless communication system according to claim 1, wherein the controller causes the wireless communication device on its own side to transmit the reception level comparison data for each frequency band at the time of communication for determining the frequency band, The own wireless communication device is made to receive the reception level comparison data for each frequency band from the other side wireless communication device, and the frequency band in which the received state of the received reception level comparison data is the best is obtained. , Causing the wireless communication device on the own side to transmit reception frequency band determination data indicating that the frequency band is the frequency band for reception by the wireless communication device, and the wireless communication device on the own side transmits the received frequency band determination data from the wireless communication device on the other side. The reception frequency determination data is received, and the wireless communication device on the local side sets the reception frequency band to the frequency band determined by the reception frequency band determination data transmitted, and is determined by the reception frequency band determination data also received. A radio communication system with a communication frequency automatic selection function, characterized in that a normal signal is provided by giving a selection signal in which a frequency band to be transmitted is used as a transmission frequency band. 3. The wireless communication system according to claim 1, wherein the wireless communication device is based on a first selection signal from the outside, and a transmission band filter for each of a plurality of transmission frequency bands. It has a means for selecting one of the transmission band-pass filters and connecting it to an antenna through a distributor, and a means for selecting a transmission carrier for each frequency band based on the first selection signal and giving it to the modulator. A transmitter, a reception band filter for each of a plurality of reception frequency bands, and one of the reception band filters is selected based on the second selection signal from the outside, and is connected to the antenna via the distributor. A wireless communication system with a communication frequency band automatic selection function, comprising: 4. A wireless communication system with a communication frequency band automatic selection function, characterized in that the wireless communication system according to any one of claims 1 to 3 performs specific low power wireless communication.