JPH0583159A - Radio equipment - Google Patents

Abstract

PURPOSE:To attain the communication among plural units with simple configuration. CONSTITUTION:A CPU 12 identifies a band of a control channel frequency from a caller station and controls a changeover operation of a transmission reception frequency by a transmission reception frequency changeover device 25 based on the identified band corresponding to a transmission reception frequency band of the caller station. Since the transmission reception frequency of the called station is set so as to be corresponding to the transmission reception frequency of the caller station, the communication among plural stations of the same system is attained without increasing the number of channels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio device such as a transceiver, which is capable of duplex communication by frequencies having a predetermined band width which are paired between a calling station and a called station. Regarding

[0002]

2. Description of the Related Art When transmitting and receiving by a duplex system between a calling station and a called station in a radio such as a transceiver of a specific low power type, as shown in FIGS. ) And the called station (B) have frequency bands of 421.5
750-421.8000 MHz and 440.0250-
440.2500 MHz.

Here, the communication frequencies at the calling station (A) and the called station (B) are 421.5750 MHz: 44.
0.0250MHZ, 421.5875MHZ: 44
0.0375MHZ ... and make a pair (pair wave),
Each channel number is assigned from (1) to (18). Incidentally, 421.8000 MHz and 44
Channel corresponding to 0.2500MHz pair wave (1
9) is a control channel for transmitting control information such as ID information and channel designation. Calling station (A)
When communication is carried out between the called station (B) and the called station (B), it is first judged whether or not the wireless devices are capable of duplex communication by transmitting control information using such a control channel. When it is determined that communication is possible, a response signal is transmitted from the called station to the calling station side, thereby performing duplex communication.

When duplex communication is performed using, for example, the channel (1), the calling station (A) has 421.5.
750 MHz is used as the transmission frequency, and the called station (B) side has 44
The transmission frequency is 0.0250 MHz. 5 and 6
Shows an example of the configuration of such a calling station and called station, and FIG. 7 shows a flow for explaining the communication state by these pairs. In the following description, the calling station (A) and the called station (B) will be simply replaced with the units A and B, respectively.

First, when control information such as ID is transmitted from the unit A which is the calling station using the control channel (19) (steps 701, 702, 706), the information is transmitted to the antenna 1 on the called station side. After being captured by (steps 711 and 712), the antenna demultiplexer (hereinafter DPX) 2
It is branched by and taken into BPF3a in the 421 MHz band.

The output after passing through the BPF 3a is the amplifiers 4 and 4
After passing through the 5 MHz band BPF 5, it is further sent to the 450 KHz band BPF 7 side through the first intermediate frequency amplifier 6.
At this time, the frequency to be taken into BPF5 is PL
The PLL loop including the L section 21, the oscillator 22, and the buffer amplifier 23 mixes frequencies in the 395 MHz band, which is the frequency at which the 45 MHz band should be obtained. At this time, the output from the first intermediate frequency amplifier 6 is mixed with the frequency from the second oscillator 8 to obtain the 450 KHz band.

The output of 450 KHz band from BPF7 is
After being amplified by the second intermediate frequency amplifier 9 and detected by a detector (hereinafter referred to as DET) 10, the modem 11
It is taken into the CPU 12 via. The CPU 12 collates (carrier senses) the detected output with the ID 13 (step 713), and if they match, sends a response signal via the modem 11 (step 714). This response signal is transmitted to the buffer amplifiers 14 and 15 and the power amplifier 1
6, the BPF 3b, the DPX 2 and the antenna 1 are sent to the unit B side. The response signal at this time is the PLL
The frequency is set to the 440 MHz band by the PLL loop of the section 21, the oscillator 24 and the buffer amplifier 15.

When the unit A on the calling station side receives the response signal (step 706), mutual duplex communication between the units A and B becomes possible (steps 707 and 715). Here, for example, when the channel (1) is an empty channel, the unit A side has a transmission frequency of 421.5750 MHz, and the unit B side has a transmission frequency of 440.0250 MHz, which is the opposite of the transmission frequency of the unit A side. It

421.5750 MHz from unit A
Communication signal is taken into the receiving system on the unit B side and changed to the 450 KHz band in the same manner as above, DET10
Is detected, further amplified by the speaker amplifier 17, and then reproduced by the speaker 18. on the other hand,
The audio signal from the microphone 19 on the unit B side is M
After passing through the IC amplifier 20, the buffer amplifiers 14 and 15, the power amplifier 16, the BPF 3b, and the DPX in the same manner as above.
It is sent to the unit A side via 2 and the antenna 1.

In this way, when the communication between the units A and B is performed and three minutes have passed or the communication is completed within three minutes (steps 708 and 716), 2
The standby state is established after an interval of at least 2 seconds (step 70).
9, 710, 717, 718). However, if the transmission suspension period and the dead state continue for 2 seconds or more during the transmission suspension period, the communication is terminated.

[0011]

As described above, in the conventional receiver described above, the transmission frequencies of the calling station and the called station are f.
a: 421.5750-421.8000 MHz and f
b: 440.0250 to 440.2500 MHz, which are different from each other, and therefore a pair of units A and B each having a paired transmission frequency is required.

Therefore, for example, as shown in FIG.
When communication is attempted by three or more units, communication can be performed between the units A and B, but communication is not possible between the units A and A and between the units B and B because the transmission frequencies are in the same band. There is a problem that it becomes possible. In such a case, fa: 421.5750-421.8000M is added to each unit A and B.
HZ and fb: 440.0250-440.2500M
Duplexing between multiple units is possible by adding the HZ transmission / reception frequency and increasing the number of channels, but not only the internal structure of each unit A and B becomes complicated, but also the cost increases. There is a problem that you are invited.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a radio device capable of performing duplex communication between a plurality of stations with a simple configuration.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a radio device which is duplexed by a plurality of stations and is capable of duplex communication at different frequencies. A transmission / reception frequency switching unit for setting a frequency and a band of a control channel frequency from a calling station are identified, and a transmission / reception frequency setting operation by the transmission / reception frequency switching unit is performed based on the identified band. And a frequency setting operation control means for controlling so as to be paired with the transmission / reception frequency band on the side.

[0015]

In the radio device of the present invention, the frequency setting operation control means identifies the band of the control channel frequency from the calling station,
Based on this identified band, the operation of setting the transmission / reception frequency by the transmission / reception frequency switching means is controlled so as to be paired with the transmission / reception frequency band on the calling station side. Therefore, since the transmission / reception frequency of the called station is set in correspondence with the transmission / reception frequency of the calling station side, communication between a plurality of stations of the same system is possible without increasing the number of channels.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIGS. 5 and 6 are designated by the same reference numerals, and a duplicate description will be omitted.

FIG. 1 shows an internal configuration of units A and B which are a calling station and a called station according to an embodiment of a radio device of the present invention. As shown in the figure, the units A and B include an antenna 1, a DPX 2, BPFs 3a and 3b, an amplifier 4,
BPF 5, first intermediate frequency amplifier 6, BPF 7, second oscillator 8, second intermediate frequency amplifier 9, DET 10, modem 1
1, CPU 12, ID 13, buffer amplifier 14, 1
5, power amplifier 16, speaker amplifier 17, speaker 18, microphone 19, MIC amplifier 20, PLL section 21,
An oscillator 22, a buffer amplifier 23, an oscillator 24, and a transmission / reception frequency switch 25 are provided.

Among these components, the functions of the characteristic portions of the units A and B in this embodiment are as follows. The CPU 12 sends a signal to the DPX 2 via the antenna 1.
When the frequency band is captured, the frequency band thus captured is identified, and the connection state of the switches SW1 and SW2 in the transmission / reception frequency switch 25 is switched so as to be paired with the frequency band on the calling station side. Further, the CPU 12 senses the carrier of the control channel frequency from the calling station, and then identifies the ID number, the channel designation, and the called station designation included in the channel frequency, and Notify empty channels. As a result, the calling station and the called station can communicate with each other through an empty channel. Further, in the CPU 12, 421.5750-421.78 including the control channel (19) shown in FIG.
75MHz and 440.0250-440.2375M
The frequency data of each channel (1) to (18) up to HZ is stored.

Next, the operation of the wireless device having such a configuration will be described with reference to FIG. In the following description, duplex communication between the units A and A, which has been impossible in the past, will be mainly described. Further, the control channel frequency in the following description is fa ′ of the channel (19):
421.8000 MHz and fb ': 440.2500
It is assumed that fa 'of MHZ is used. Further, the channel frequency used for communication is fa:
421.5750-421.875MHZ and fb:
440.0250-440.2375 MHz is used.

First, in the standby state, each unit A of the calling station and the called station is in a receiving state at a channel frequency of fa ': 421.8000 MHz (step 20).
1). At this time, the transmission / reception frequency switch 2 of each unit A
The switches SW1 and SW2 of No. 5 are switched to the terminal a side. Then, when a call is made at the calling station side, after selection of an empty channel, acquisition of an empty channel and carrier sense are performed by the MCA system generally used in communication (steps 202 to 20).
5), the control signal including the ID number, the called station designation, and the channel designation signal is Fa ′: 421.8 of the control channel.
It is transmitted at 000 MHz (step 206). Note that this transmission period is within 0.5 seconds.

At this time, the switches SW1 and SW2 of the transmission / reception frequency switching unit 25 on the calling station side are respectively at terminals b.
It is switched to the side (this state is maintained until the end of communication). The control channel frequency taken in via the antenna 1 passes through the BPF 3a and the a terminal side of the switch SW2, and then the amplifier 4, BPF 5, the first intermediate frequency amplifier 6, B
It is taken into the CPU 12 via the PF 7, the second intermediate frequency amplifier 9, the DET 10 and the modem 11. CPU12 DET10 detection output and called station setting number (optional setting possible)
(Step 214), and if they match, a response signal in the 440 MHz band is transmitted through the modem 11 after carrier sensing (steps 215, 216).

This response signal is transmitted to the buffer amplifiers 14 and 1
5, the power amplifier 16, the terminal a of the switch SW1 of the transmission / reception frequency switch 25, the BPF 3b, the DPX 2 and the antenna 1 are sent to the calling station side (step 21).
6). When the calling station receives the response signal from the called station (step 208), communication with the called station becomes possible. As a result, the empty channel selected in (step 203) is used, the calling station uses the 421 MHz band as the transmission frequency, and the called station uses the 440 MHz band as the transmission frequency (step 209). At the time of communication, the communication signals fetched by the calling station and the called station respectively
The signal is detected by 10, amplified by the speaker amplifier 17, and then reproduced by the speaker 18.

On the other hand, the audio signals from the respective microphones 19 pass through the MIC amplifier 20, and in the same manner as described above, the buffer amplifiers 14 and 15, the power amplifier 16 and the BPF 3a.
Alternatively, it is sent to the calling station side or the called station side via 3b, the DPX 2 and the antenna 1 (steps 209, 217).
In this way, communication is performed between the units A and A of the calling station and the called station, and if the communication is completed after 3 minutes or within 3 minutes (steps 210 and 21).
8) The standby state is established after an interval of 2 seconds or more (steps 211, 212, 219, 220). However, if the transmission suspension period and the dead state continue for 2 seconds or more during the transmission suspension period, the communication is terminated.

As described above, in this embodiment, the CPU 12 identifies the control channel frequency band from the calling station, and the transmission / reception frequency switching operation by the transmission / reception frequency switching unit 25 is called based on the identified band. Control is performed so as to be paired with the transmission / reception frequency band of the station. Therefore, since the transmission / reception frequency of the called station is set to match the transmission / reception frequency of the calling station side, communication between a plurality of stations of the same system is possible without increasing the number of channels. ..

[0025]

As described above, according to the wireless device of the present invention, the frequency setting operation control means identifies the band of the control channel frequency from the calling station, and the transmission / reception frequency switching is performed based on the identified band. The setting operation of the transmission / reception frequency by the means is controlled so as to be paired with the transmission / reception frequency band on the calling station side. Therefore, since the transmission / reception frequency of the called station is set to reciprocate to the transmission / reception frequency of the calling station side, communication between a plurality of stations of the same system becomes possible without increasing the number of channels, It is possible to perform duplex communication between a plurality of stations with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an internal configuration of a unit B which is a called station according to an embodiment of a wireless device of the present invention.

FIG. 2 is a flowchart for explaining a communication state between the called station and the calling station of FIG.

FIG. 3 is a diagram showing a calling station and a called station in a conventional wireless device.

4 is a diagram showing respective channel frequencies of a calling station and a called station in the wireless device of FIG.

5 is a block diagram showing an internal configuration of a calling station in the wireless device of FIG.

6 is a block diagram showing an internal configuration of a called station in the wireless device of FIG.

7 is a flowchart for explaining a communication state between a calling station and a called station in the wireless device of FIG.

FIG. 8 is a diagram for explaining an inconvenient state in the wireless device of FIG.

[Explanation of symbols]

 A, B unit 1 antenna 2 DPX (antenna demultiplexer) 3a, 3b, 5, 7 BPF 4 amplifier 8 second oscillator 9 second intermediate frequency amplifier 10 DET (detector) 11 modem 12 CPU 13 ID 14, 15 , 23 Buffer amplifier 16 Power amplifier 17 Speaker amplifier 18 Speaker 19 Microphone 20 MIC amplifier 21 PLL section 22 Oscillator 24 Oscillator 25 Transmit / receive frequency switcher

Claims (1)

[Claims] 1. In a radio device capable of duplex communication with a plurality of stations and different frequencies, the transmission / reception frequency switching means for setting the respective transmission / reception frequencies, and the calling station. Of the control channel frequency, and a frequency setting operation for controlling the transmission / reception frequency setting operation by the transmission / reception frequency switching means based on the identified band so that the transmission / reception frequency setting operation of the transmission / reception frequency side is performed in parallel with the transmission / reception frequency band of the calling station A wireless device comprising a control means.