JP3419750B2 - Automatic repeater for mobile radio communication - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic repeater for mobile radio communication which uses radio waves of frequencies close to each other.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIG.
In mobile wireless communication in which simplex wireless communication is performed between the mobile station 2 and the mobile station 2, in a blind area where reception sensitivity cannot be obtained due to radio wave propagation being hindered by mountains and hills, a clear line of sight such as the mountain 3 A relay device 4 is installed to cover communication.

The base station 1 comprises a transmitter T1 having a frequency F1.
And a radio 5 including a receiver R1 and an antenna 6. The mobile station 2 also includes a radio 7 including a transmitter T2 having a frequency F2 and a receiver R2, and an antenna 8. The relay device 4 includes a first radio 9 including a transmitter T1 and a receiver R1 having a frequency F1, and a second radio 10 including a transmitter T2 and a receiver R2 having a frequency F2, and a base station. Antenna 11 for communicating with station 1
And an antenna 12 for communicating with the mobile station 2.

That is, the repeater 4 is equipped with two radios 9 and 10 having different frequencies, inputs the voices received by the receivers R1 and R2 to the transmitters T2 and T1 facing each other, and transmits the downlink (F1 → F2) and the uplink (F2 → F1) are switched and used. In this case, generally, the frequency difference between the channels used in the up direction and the down direction is largely separated, and for example, the frequency difference is set to 4 MHz in the 150 MHz band and 10 MHz or more in the 400 MHz band to influence each other. I try not to. This type of relay system is generally called B diagram relay.

However, recently, the number of channels has become insufficient with the development of wireless communication, and it is very difficult to set the frequency intervals by separating them as described above. If the frequencies of F1 and F2 are set close to each other, the
As shown in (a), the first wireless device 9 in the relay device 4
When the transmitter T1 and the receiver R2 of the second radio 10 simultaneously perform transmission and reception, the transmitter T1 and the receiver R2 are close to each other, and as shown in FIG. Since the output level of the frequency F1 maintains a certain level even at the frequency F2 of the adjacent channel, the transmission radio wave exceeding 100 dBμ wraps around from the antenna 11 of the first wireless device 9 to the antenna 12 of the second wireless device 10. , The receiver F2 of the second wireless device 10 suffers a reception failure due to sensitivity suppression and transmitter noise, and communication is disabled.

[0006] The sneak of the transmission radio wave between the transmitter and the receiver as described above can be prevented by installing the interference wave removing devices 15 and 16 in the relay device 4 as shown in FIG. The interference wave removing device 15 prevents the frequency F1 from sneaking into the second radio device 10 from the first radio device 9,
The interference wave removing device 16 prevents the frequency F2 from wrapping around from the second radio device 10 to the first radio device 9.

[0007]

However, the relay device 4 provided with the above-mentioned interference wave removing devices 15 and 16 has the following problems.

(1) Utilization efficiency of the interference wave removing devices 15 and 16 is poor. That is, when one of the interfering wave removing devices operates, the other interfering wave removing device is inactive, so that only a maximum utilization efficiency of 50% can be obtained.

(2) It is uneconomical to install an up radio and a down radio because the equipment is large. Furthermore, this problem becomes even more apparent when the number of relay frequencies (channels) increases.

(3) The mobile station 2 is a downlink for mobile stations.
If the relay antenna moves in a wide range, the direction of the relay radio wave will change, and if the direction of the relay antenna is constant, it will not be covered.

(4) When there are a plurality of base stations 1, the base station 1
The distance between the relay device 4 and the relay device 4 changes greatly, the difference in the electric field received by the relay device 4 becomes large, and it becomes necessary to change the direction and gain of the relay antenna.

The present invention has been made to solve the above problems, and provides an automatic relay device for mobile radio communication, which can improve the utilization efficiency of the interference wave removing device, can downsize the facility, and is economical. The purpose is to do. Further, the present invention provides an automatic relay device for mobile radio communication capable of reliably performing radio relay even when the mobile station moves over a wide range or when there are a plurality of base stations. To aim.

[0013]

A first invention is an automatic relay apparatus for mobile radio communication for relaying radio communication between a base station and a mobile station, wherein a first frequency used by the base station and the mobile station are used. A transmitter whose frequency can be switched according to the second frequency used by the receiver, a receiver whose frequency can be switched according to the first frequency and the second frequency, and a radio wave to and from the base station. An antenna for a base station, an antenna for a mobile station that transmits and receives radio waves to and from the mobile station, and a switch circuit that switches and connects the antenna for the base station and the antenna for the mobile station to the transmitter and the receiver.
By changing the frequency of the variable interference wave removing device that removes the interference wave that circulates from the transmitter to the receiver via the antenna, and the frequency of the receiver, the transmitter and the interference wave removing device, and the switch circuit at a predetermined interval. The reception signal level of the receiver is detected, and switching of the frequency and switching of the switch circuit are stopped when a signal having a level higher than a set level is received, and a transmission command is given to the transmitter to give the base station and the mobile station. And a relay control means for relaying wireless communication between the mobile station and the mobile station, the mobile station antenna is divided into a plurality of antennas, the reception signal of the receiver is monitored by the relay control means, and the antenna having the highest reception level is selected. It is characterized by being selected and used.

A second aspect of the present invention is an automatic relay apparatus for mobile radio communication for relaying radio communication between a base station and a mobile station, wherein a first frequency used by the base station and a second frequency used by the mobile station are used. A transmitter whose frequency can be switched according to the frequency, a receiver whose frequency can be switched according to the first frequency and the second frequency, and a base station antenna for transmitting and receiving radio waves to and from the base station. , A mobile station antenna for transmitting and receiving radio waves to and from the mobile station, a switch circuit for selectively connecting the base station antenna and the mobile station antenna to the transmitter and the receiver, and an antenna from the transmitter. A variable frequency interference wave removing device for removing the interference wave that goes around to the receiver via the frequency of the receiver, transmitter and interference wave removing device and the switch circuit are switched at a predetermined interval. Detects the received signal level of the receiver, stops switching of the frequency and switching of the switch circuit when receiving a signal of a set level or higher, and gives a transmission command to the transmitter to transmit the base station and the mobile station. And a relay control means for relaying wireless communication between the base stations, the antenna for the base station is divided into a plurality of antennas, and the reception signal of the receiver is monitored by the relay control means to select the antenna having the highest reception level. It is characterized by being used.

According to a third aspect of the present invention, in a mobile radio communication automatic repeater for relaying radio communication between a base station and a mobile station, a first frequency used by the base station and a second frequency used by the mobile station are provided. A transmitter whose frequency can be switched according to the frequency, a receiver whose frequency can be switched according to the first frequency and the second frequency, and a base station antenna for transmitting and receiving radio waves to and from the base station. , A mobile station antenna for transmitting and receiving radio waves to and from the mobile station, a switch circuit for selectively connecting the base station antenna and the mobile station antenna to the transmitter and the receiver, and an antenna from the transmitter. A variable frequency interference wave removing device for removing the interference wave that goes around to the receiver via the frequency of the receiver, transmitter and interference wave removing device and the switch circuit are switched at a predetermined interval. Detects the received signal level of the receiver, stops switching of the frequency and switching of the switch circuit when receiving a signal of a set level or higher, and gives a transmission command to the transmitter to transmit the base station and the mobile station. And a relay control means for relaying wireless communication between the base station and the mobile station. The base station antenna and the mobile station antenna are each divided into a plurality of antennas, and the reception signal of the receiver is monitored by the relay control means to be received most. It is characterized in that an antenna for a base station and an antenna for a mobile station having a high level are selected and used.

[0016]

[0017]

A fourth invention is the above-mentioned first, second or third invention.
In the automatic relay apparatus for mobile radio communication according to the invention, the relay control means is configured to switch and set the first frequency and the second frequency for the receiver and the transmitter while maintaining an inverse relationship to each other. Automatic relay device for mobile wireless communication.

A fifth aspect of the present invention is the above-mentioned first, second or third aspect.
In the mobile radio communication automatic repeater according to the present invention, the relay control means switches and sets the first frequency and the second frequency in the receiver and the transmitter while maintaining an inverse relationship to each other and removes the interference wave. An automatic repeater for mobile radio communication, characterized in that the interference wave elimination frequency of the device is switched and set in accordance with the set frequency of the transmitter.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram of an automatic relay device for mobile radio communication according to a first embodiment of the present invention. This first
The automatic repeater according to the embodiment is a case where the automatic repeater is configured by one interference wave removing device, one wireless device (a combination of one transmitter and one receiver), and two antennas. This is an example. Further, as shown in FIG. 7, it is assumed that the base station 1 transmits a radio wave of frequency F1 and the mobile station 2 transmits a radio wave of frequency F2. The frequencies of F1 and F2 are set to close values.

In FIG. 1, reference numeral 21 denotes a wireless device, which is composed of a variable frequency transmitter 22 that switches the transmission frequency to F1 and F2 for transmission, and a variable frequency receiver 23 that receives by switching the reception frequency to F1 and F2. The operation is controlled by the relay controller 24. An omnidirectional transmission antenna 25 is connected to the transmitter 22, and an omnidirectional reception antenna 26 is connected to the receiver 23. Further, between the transmitter 22 and the transmitting antenna 25, and the receiver 23.
Between the receiving antenna 26 and the receiving antenna 26, a variable frequency interference wave removing device 27 that prevents the frequencies F1 and F2 from wrapping around is connected. Details of the interference wave removing device 27 will be described later.

The relay controller 24 controls the switching of the frequencies of the channels used by the transmitter 22 and the receiver 23 at regular time intervals, and also provides a monitor frequency switching signal to the interference wave removing device 27 to remove interference waves. Change the frequency of. The receiver 23 alternately switches between the radio wave of the frequency F1 transmitted from the base station 1 and the radio wave of the frequency F2 transmitted from the mobile station 2 by the frequency switching command of the relay controller 24, and demodulates the audio signal. And outputs it to the transmitter 22. In addition, the receiver 23 receives a received signal strength indication signal (RSSI: Receiving Signal Strength).
h Indicator) is output to the relay controller 24.

The relay controller 24 monitors the received signal strength indication signal RSSI output from the receiver 23, and stops the switching operation when there is an incoming call with a strength sufficient to obtain a sufficient SN ratio. , And gives a transmission command to the transmitter 22.

In the above structure, the relay controller 24 is
The frequencies F1 and F2 of the transmitter 22, the receiver 23, and the interference wave removing device 27 are sequentially switched as shown in FIG. 2 in a sequence of, for example, several tens to several hundreds ms. In FIG. 2, Rx represents the switching timing of the reception frequencies F1 and F2 in the receiver 23, and Tx represents the switching timing of the transmission frequencies F1 and F2 in the transmitter 22. That is, the relay controller 24 controls the transmitter 22 and the receiver 23 so that the frequencies F1 and F2 are in an inverse relationship to each other. For example, when the set frequency of the receiver 23 is F1, the set frequency of the transmitter 22 is F2. In addition, the interference wave elimination frequency F for the interference wave elimination device 27
Switching between 1 and F2 is performed at the same Tx timing as the transmitter 22. The transmitter 22 is a relay controller 24.
The transmission operation is not performed until the transmission command is given from.

The receiver 23 receives radio waves of frequency F1 transmitted from the base station 1 and frequency F2 transmitted from the mobile station 2.
Radio waves are alternately received according to the frequency switching command of the relay controller 24, the voice signal is demodulated and output to the transmitter 22, and the received signal strength indication signal RSSI is transmitted to the relay controller 24.
Output to.

The relay controller 24 constantly monitors the received signal strength indication signal RSSI output from the receiver 23, and when there is an incoming call with a strength enough to obtain a sufficient SN ratio, the transmitter 22 , Receiver 23 and interference canceller 27
The frequency switching operation is stopped and a transmission command is given to the transmitter 22.

Now, for example, assuming that the receiver 23 receives the radio wave (F1) transmitted from the base station 1 by the reception antenna 26, the relay controller 24 determines that the reception signal strength indication signal RS.
The reception strength is judged by SI, and if the reception strength is equal to or higher than the set level, the frequency switching operation is stopped and the frequency of the transmitter 22 and the interference wave canceller 27 is transmitted to the transmitter 22 while being kept at F2. Give orders. Transmitter 22
When a transmission command is given from the relay controller 24, the receiver 2
A modulation operation is performed by the voice signal from the base station 1 demodulated in 3, and a radio wave of frequency F2 is transmitted from the transmitting antenna 25 to the mobile station 2.

At this time, a part of the radio wave of the frequency F2 transmitted from the transmitting antenna 25 wraps around to the receiving antenna 26, but is removed by the interfering wave removing device 27. Therefore,
The receiver 23 can continue to receive the radio wave from the base station 1 without being disturbed by the radio wave transmitted from the transmitting antenna 25, and can relay the radio wave to the mobile station 2 via the transmitter 22.

After that, when the relay controller 24 detects that the transmission from the base station 1 is completed by the received signal strength indication signal RSSI output from the receiver 23, the transmitter 2
The transmission operation of No. 2 is stopped, and the frequency switching control for the transmitter 22, the receiver 23, and the interference wave removing device 27 is restarted.

Further, when the receiver 23 receives the radio wave (F2) transmitted from the mobile station 2, the relay controller 24 stops the frequency switching operation, and the transmitter 22 and the interfering wave removing device 27 are stopped. Transmitter 22 with the frequency kept at F1
Give a send command to. As a result, the transmitter 22 performs a modulation operation with the voice signal from the mobile station 2 demodulated by the receiver 23, and transmits a radio wave of frequency F1 from the transmission antenna 25 to the base station 1. At this time, a part of the radio wave of frequency F1 transmitted from the transmitting antenna 25 is received by the receiving antenna 26.
However, since the frequency of the interference wave removing device 27 is switched to F1, the interference wave removing device 27 is removed in the same manner as the case of the frequency F2. Therefore, the receiver 23 uses the transmitting antenna 2
The radio wave from the mobile station 2 can be continuously received without being disturbed by the radio wave transmitted from the mobile station 5, and can be relayed to the base station 1 via the transmitter 22.

When the transmission from the mobile station 2 is completed, the relay controller 24 restarts the frequency switching control for the transmitter 22, the receiver 23 and the interference wave removing device 27.

As described above, in the first embodiment, one interference wave elimination device 27, one radio device 21 and two antennas 25 and 26 constitute an automatic repeater device. The utilization efficiency of the removing device 27 can be improved, and the equipment can be downsized to improve the economical efficiency.

Next, details of the interference wave removing device 27 will be described with reference to FIG. The interference wave removing device 27 is
The directional coupler 3 is provided between the transmitter 22 and the transmitting antenna 25.
1, and directional couplers 32 and 33 are connected in series between the receiving antenna 26 and the receiver 23.
The directional coupler 31 branches a part of the output signal of the transmitter 22, for example, a signal of about 1/100 as a signal for canceling an interference wave, and directs it via a variable attenuator 34 and a variable phase shifter 35. Input to the combiner 32.

The directional coupler 33 is provided in the receiver 2
A part of the signal input to 3 is divided into, for example, about 1/100, and the branched signal is input to the monitor receiver 36. This monitor receiver 36 selects the frequency F1 or F2 from the received signals.
Is monitored and input to the cancellation control unit 38 via the A / D converter 37. Switching of the monitor frequencies F1 and F2 in the monitor receiver 36 is performed by a monitor frequency switching signal provided from the relay controller 24. For example, the monitor receiver 36 is a super-heterodyne system, and the local oscillator is composed of a PLL (Phase Locked Loop) synthesizer. Therefore, the monitor frequency is switched to F1 And switched to F2.

The cancellation control section 38 is constituted by using, for example, a microprocessor, and based on the signal of the frequency F1 or F2 input from the monitor receiver 36, the attenuation amount of the variable attenuator 34 and the variable phase shifter 35. Phase shift amount is D
Control is performed via the / A converters 39 and 40. That is, the cancellation control unit 38 controls the variable attenuator 34 and the variable phase shifter 35 so that the signal of the frequency F1 or F2 monitored by the monitor receiver 36 is minimized.

In the above structure, the output signal of the transmitter 22 is sent to the transmitting antenna 25 via the directional coupler 31 of the interference wave removing device 27, and is transmitted from the transmitting antenna 25 to the outside. The directional coupler 31 is used in the transmitter 2
A part of the output signal of 2 is branched as a cancellation signal, and is input to the directional coupler 32 on the receiving side via the variable attenuator 34 and the variable phase shifter 35.

On the other hand, the monitor receiver 36 is the relay controller 2
The wraparound interference wave of the frequency F1 or F2 is monitored by the monitor frequency switching signal from 4, and when the wraparound interference wave is detected, the detection signal is canceled and the control unit 38
To enter.

The cancellation control section 38 controls the attenuation amount of the variable attenuator 34 and the variable phase shifter 35 in accordance with the level and phase of the wraparound interference wave monitored by the monitor receiver 36.
Is controlled so that the wraparound disturbance monitored by the monitor receiver 36 is minimized. That is,
The cancellation control unit 38 has the same level of the cancellation signal input to the directional coupler 32 via the variable attenuator 34 and the variable phase shifter 35 with respect to the interfering wave that circulates from the transmission antenna 25 to the reception antenna 26. , And the phase is 180 °
The variable attenuator 34 and the variable phase shifter 35 are controlled so as to be different from each other to remove the wraparound interference wave.

Even if the frequency of the transmitter 22 is switched to F1 and F2 as described above, the monitor receiver 3 is synchronized with this.
The monitor frequency of No. 6 is switched to F1 and F2, and the cancellation control unit 38 controls the attenuation amount of the variable attenuator 34 and the phase shift amount of the variable phase shifter 35.
The interference wave sneaking into the receiving antenna 26 from can be reliably removed.

In the above embodiment, the received signal strength indication signal RSSI output from the receiver is input to the relay controller to detect the strength of the received signal.
A squelch signal may be used instead of the I signal to detect the intensity of the received signal.

(Second Embodiment) FIG. 4 is a block diagram of an automatic relay apparatus for mobile radio communication according to a second embodiment of the present invention. The automatic repeater according to the second embodiment is an omnidirectional transmission antenna 25 according to the first embodiment shown in FIG.
Also, a directional base station antenna 41 and a mobile station antenna 42 are provided in place of the receiving antenna 26, and these base station antenna 41 and mobile station antenna 4 are provided.
2 by the switch circuit 43, the transmitter 22 and the receiver 23
It is configured to switch connection to. Other than that, the configuration is similar to that of the automatic repeater shown in the first embodiment, and therefore, the same portions as those in FIG. 1 are designated by the same reference numerals and detailed description thereof will be omitted.

The switch circuit 43 is composed of four switches S1, S2, S3 and S4, each having 2 switches.
It has two switching contacts 1 and 2. The switch S1
Each of S4 to S4 is composed of a switch element such as a relay, and can be switched by a switching signal from the relay controller 24. The switch circuit 43 is paired with switches S1 and S2, S3 and S4 to form S1-2 system and S3-4 system, respectively.

In the S1-2 system, the common contact of the switch S1 is connected to the base station antenna 41, and the common contact of the switch S2 is connected to the transmitter 22 via the interference wave removing device 27. In the S3-4 system, the common contact of the switch S3 is connected to the receiver 23 via the interference wave removing device 27, and the common contact of the switch S4 is connected to the mobile station antenna 42.

Further, the contacts 1-1 of the switches S1 and S2
And the contacts 2-2 of the switches S3 and S4 are connected. Further, the contact 2 of the switch S1 and the switch S3
And the contact 1 of the switch S2 and the contact 1 of the switch S4, respectively.

Then, in the case of downlink relay in which the base station 1 relays to the mobile station 2, the relay controller 24 sets the frequency of the receiver 23 to F1 and the frequencies of the transmitter 22 and the interference wave canceller 27 to F2. At the same time, the contact position of the S1-2 system of the switch circuit 43 is set to "2", and the contact position of the S3-4 system is set to "1".

Further, in the case of uplink relay from the mobile station 2 to the base station 1, the relay controller 24 sets the frequency of the receiver 23 to F2 and the frequencies of the transmitter 22 and the interference wave canceller 27 to F1. At the same time, the contact position of the S1-2 system of the switch circuit 43 is set to "1" and the contact position of the S3-4 system is set to "2".

In the above configuration, the relay controller 24 is
The frequencies F1 and F2 of the transmitter 22, the receiver 23, and the interfering wave removing device 27 are sequentially switched, and the switch circuit 43 is used.
Switch.

The receiver 23 uses the switch circuit 43 S1-2.
When the contact position of the system is set to "2" and the contact position of the S3-4 system is set to "1", it is connected to the base station antenna 41,
When the radio wave transmitted from the base station 1 is received and the contact position of the S1-2 system is set to "1" and the contact position of the S3-4 system is set to "2", it is connected to the mobile station antenna 42. That is,
The switching circuit 43 is switched by the switching signal from the relay controller 24, so that the receiver 23 is alternately connected to the base station antenna 41 and the mobile station antenna 42, and the radio wave transmitted from the base station 1 and the mobile station are transmitted. Radio waves transmitted from 2 are received alternately.

Now, the receiver 23 has a base station antenna 41.
When a radio wave (F1) having a level higher than a set level is received from the base station 1 when the switch connection is made to the relay controller 24, the relay controller 24 stops the switching operation and gives a transmission command to the transmitter 22.
At this time, the transmitter 22 has a transmission frequency of F2 and is connected to the mobile station antenna 42 via the switch circuit 43. Therefore, the transmitter 22 has the frequency F2.
Radio wave is transmitted from the mobile station antenna 42, and the base station 1
The radio wave received from is relayed to the mobile station 2. At this time, the interfering wave removing device 27 is set to the frequency of F2, and removes the interfering wave that wraps around from the mobile station antenna 42 to the base station antenna 41. After that, when the transmission from the base station 1 to the mobile station 2 ends, the relay controller 24 restarts the frequency switching and the switching operation of the switch circuit 43.

Further, the receiver 23 uses the mobile station antenna 4
When a radio wave (F2) equal to or higher than a set level is received from the mobile station 2 when the switching connection is 2, the relay controller 24 stops the switching operation and gives a transmission command to the transmitter 22. At this time, the transmitter 22 is in a state where the transmission frequency is F1 and is connected to the base station antenna 41 via the switch circuit 43. Therefore, the transmitter 22 transmits the radio wave of the frequency F1 from the base station antenna 41 and relays the radio wave received from the mobile station 2 to the base station 1. At this time, the interfering wave removing device 27 is set to the frequency of F1 and removes the interfering wave that goes around from the base station antenna 41 to the mobile station antenna 42. After that, when the transmission from the mobile station 2 to the base station 1 is completed, the relay controller 24 restarts the frequency switching and the switching operation of the switch circuit 43. Less than,
The same operation is repeatedly executed.

In the second embodiment, since directional antennas can be used as the base station antenna 41 and the mobile station antenna 42, the receiver 23 can reduce the influence of ambient noise and receive with high sensitivity. In addition, the transmitter 22 can radiate radio waves concentratedly in the direction of the base station 1 and can perform transmission with high power efficiency. Further, the directivities of the base station antenna 41 and the mobile station antenna 42 can be arbitrarily set in accordance with usage conditions and the like.

(Third Embodiment) FIG. 5 is a block diagram of an automatic relay apparatus for mobile radio communication according to a third embodiment of the present invention. The automatic repeater according to the third embodiment is different from the second embodiment shown in FIG. 4 in that a plurality of, for example, three mobile station antennas 42a to 42c are provided, and the mobile station antennas 42a to 42c are connected to the switch S5. The switch circuit is connected to the switch circuit 43 by switching. The switch S5 is switched by a switching signal from the relay controller 24. The mobile station antennas 42a-4
For 2c, a directional one is used, and its direction is set to be different by a predetermined angle. That is, by using the plurality of mobile station antennas 42a to 42c, the radio wave reception range is widened so that the transmission radio wave can be reliably received even when the mobile station 2 moves over a wide range.

In the upstream relay, S of the switch circuit 43
When the 3-4 system is set to "2", the relay controller 24 switches the switch S5 according to the switching signal to sequentially connect the mobile station antennas 42a to 42c to the receiver 23. At this time, if the receiver 23 receives an incoming call from the mobile station 2, the relay controller 24 compares the reception levels of the mobile station antennas 42a to 42c with the reception signal strength indication signal RSSI, and switches to the antenna with the highest reception level. The transmission command is output to the transmitter 22 while S5 is switched. As a result, the transmitter 22 operates, transmits the radio wave of the frequency F1 from the base station antenna 41 to the base station 1, and relays the received radio wave from the mobile station 2 to the base station 1.

In the case of downlink relay, the mobile station antenna selected in the uplink relay is used and the transmitter 22
Transmits a radio wave (F2) to the mobile station 2.

According to the third embodiment described above, even when the mobile station 2 moves over a wide range, the antenna 4 for the mobile station is used.
Since the antenna having the highest reception level is selected from 2a to 42c, the radio wave from the mobile station 2 can be received with high sensitivity. Therefore, the communicable range between the relay device and the mobile station 2 can be widened and the communicable distance can be lengthened.

(Fourth Embodiment) FIG. 6 is a block diagram of an automatic relay apparatus for mobile radio communication according to a fourth embodiment of the present invention. The automatic repeater according to the fourth embodiment is different from the second embodiment shown in FIG. 4 in that a plurality of, for example, three base station antennas 41a to 41c are provided, and these base station antennas 41a to 41c are connected to the switch S6. The switch circuit is connected to the switch circuit 43 by switching. The switch S6 is switched by a switching signal from the relay controller 24. The base station antennas 41a to 4a
1c uses a directional one, and is set according to different base stations 1. That is, the fourth embodiment is applicable to the case where the mobile station 2 is almost fixed and a plurality of base stations 1 that access the mobile station 2 are scattered around the relay device (relay station). It is a thing.

In the downstream relay, S of the switch circuit 43
When the 3-4 system is set to "1", the relay controller 24 switches the switch S6 by the switching signal to sequentially connect the base station antennas 41a to 41c to the receiver 23. At this time, if the receiver 23 receives an incoming call from the base station 1, the relay controller 24 compares the reception levels of the base station antennas 41a to 41c with the reception signal strength indication signal RSSI, and switches to the antenna with the highest reception level. The transmission command is output to the transmitter 22 while S6 is switched. As a result, the transmitter 22 operates to transmit the radio wave of the frequency F2 from the mobile station antenna 42 to the mobile station 2, and relay the received radio wave from the base station 1 to the mobile station 2. In the case of upstream relay,
Using the antenna for the base station selected in the downlink relay, a radio wave (F1) is transmitted from the transmitter 22 to the base station 1.

According to the fourth embodiment described above, even when a plurality of base stations 1 that access the mobile station 2 are scattered around the relay device (relay station), a plurality of base station antennas are provided. By switching 41a to 41c, it is possible to reliably perform communication between the base station 1 and the relay device.

In the fourth embodiment, the gains of the base station antennas 41a to 41c may be changed in advance according to the distance from the relay device to each base station 1, the radio wave propagation environment and the like. For example, when the distance between the base station 1 and the relay device is long or the attenuation of radio waves is large, an antenna with a high gain is used to ensure communication between the base station 1 and the relay device. Can be done.

In addition, when the mobile station 2 largely moves (the dead zone is wide) and a plurality of base stations 1 that access the mobile station 2 surround the relay device, the third station is used.
The combination of the embodiment and the fourth embodiment is effective. That is, by providing a plurality of antennas 41a to 41c for base stations and antennas 42a to 42c for mobile stations and switching them by switches S5 and S6,
Even if the mobile station 2 largely moves, it is possible to reliably relay between the mobile station 2 and the plurality of base stations 1.

[0061]

As described above in detail, according to the present invention, a radio device including a transmitter and a receiver capable of frequency switching and an interference wave canceling device capable of switching a cancellation frequency are combined, Since the relay is performed between the base station and the mobile station, it is possible to improve the utilization efficiency of the interference wave removing device and to relay with one wireless device, thereby making it possible to downsize the equipment and improve the economical efficiency. You can

Further, according to the present invention, a plurality of base station antennas or mobile station antennas are installed, and the reception levels of these antennas are detected and switched to the antenna of the maximum reception level, so that the influence of noise is reduced. In addition, it is possible to perform wireless relay with less wasted power.

Further, according to the present invention, a plurality of antennas for base stations and antennas for mobile stations are installed, and the reception levels of these antennas are detected and switched to the antenna of the maximum reception level. Even when moving, or even when a plurality of base stations surrounding the relay station are scattered, reliable and efficient wireless relay can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an automatic relay device for mobile radio communication according to a first embodiment of the present invention.

FIG. 2 is an exemplary view showing timings of frequency switching of a receiver and a transmitter in the same embodiment.

FIG. 3 is a configuration diagram showing details of an interference wave removing device according to the first embodiment.

FIG. 4 is a configuration diagram of an automatic relay device according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of an automatic relay device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of an automatic relay device according to a fourth embodiment of the present invention.

FIG. 7 is a diagram for explaining a conventional relay system between a base station and a mobile station.

FIG. 8 is a diagram for explaining an operation of generating a wraparound interference wave between two wireless devices whose frequencies are close to each other.

FIG. 9 is a configuration diagram of a near-frequency relay device using a conventional interference wave removing device.

[Explanation of symbols]

21 radio 22 transmitter 23 receiver 24 Relay controller 25 transmitting antenna 26 Receiving antenna 27 Interfering wave remover 31, 32, 33 Directional coupler 34 Variable attenuator 35 variable phase shifter 36 monitor receiver 37 A / D converter 39, 40 D / A converter 38 Cancellation control unit 41, 41a to 41c Antenna for base station 42, 42a to 42c Antennas for mobile stations 43 switch circuit S1 to S6 switches

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeru Saito 4-72 Miyagaya Pagoda, Omiya City, Saitama Prefecture At Antenna Giken Co., Ltd. (72) Hideaki Imahashi 4-33 Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Chugoku Electric Power Co., Inc. (56) Reference JP-A-1-115228 (JP, A) JP-A-9-36764 (JP, A) JP-A-62-263726 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (5)

(57) [Claims] 1. An automatic repeater for mobile radio communication for relaying radio communication between a base station and a mobile station, wherein a first frequency used by a base station and a second frequency used by a mobile station are used.
, A receiver whose frequency can be switched according to the frequency, a receiver whose frequency can be switched according to the first frequency and the second frequency, and a base station antenna for transmitting and receiving radio waves to and from the base station A mobile station antenna for transmitting and receiving radio waves to and from the mobile station; a switch circuit for selectively connecting the base station antenna and the mobile station antenna to the transmitter and the receiver; and the transmitter to antenna Frequency variable interference wave removing device for removing the interference wave that goes around to the receiver via the receiver, the frequency of the receiver, the transmitter and the interference wave removing device and the switch circuit are switched at a predetermined interval to receive the receiver signal. Detects the signal level, stops the frequency switching and switching circuit switching when a signal above the set level is received, and sends a transmission command to the transmitter. Given by and a relay control means for relaying the wireless communication between the mobile station and the base station divides the mobile station's antenna to a plurality of antennas, receiving
The received signal of the receiver is monitored by the relay control means and received the most.
An automatic repeater for mobile radio communication, which is characterized by selecting and using an antenna with a high signal level . 2. An automatic repeater for mobile radio communication, which relays radio communication between a base station and a mobile station, wherein a first frequency used by a base station and a second frequency used by a mobile station are used.
, A receiver whose frequency can be switched according to the frequency, a receiver whose frequency can be switched according to the first frequency and the second frequency, and a base station antenna for transmitting and receiving radio waves to and from the base station A mobile station antenna for transmitting and receiving radio waves to and from the mobile station; a switch circuit for selectively connecting the base station antenna and the mobile station antenna to the transmitter and the receiver; and the transmitter to antenna Frequency variable interference wave removing device for removing the interference wave that goes around to the receiver via the receiver, the frequency of the receiver, the transmitter and the interference wave removing device and the switch circuit are switched at a predetermined interval to receive the receiver signal. Detects the signal level, stops the frequency switching and switching circuit switching when a signal above the set level is received, and sends a transmission command to the transmitter. Given by and a relay control means for relaying the wireless communication between the mobile station and the base station divides the base station for antenna to a plurality of antennas, receiving
The received signal of the receiver is monitored by the relay control means and received the most.
An automatic repeater for mobile radio communication, which is characterized by selecting and using an antenna with high signal level . 3. An automatic relay device for mobile radio communication for relaying radio communication between a base station and a mobile station, wherein a first frequency used by the base station and a second frequency used by the mobile station are used.
, A receiver whose frequency can be switched according to the frequency, a receiver whose frequency can be switched according to the first frequency and the second frequency, and a base station antenna for transmitting and receiving radio waves to and from the base station A mobile station antenna for transmitting and receiving radio waves to and from the mobile station; a switch circuit for selectively connecting the base station antenna and the mobile station antenna to the transmitter and the receiver; and the transmitter to antenna Frequency variable interference wave removing device for removing the interference wave that goes around to the receiver via the receiver, the frequency of the receiver, the transmitter and the interference wave removing device and the switch circuit are switched at a predetermined interval to receive the receiver signal. Detects the signal level, stops the frequency switching and switching circuit switching when a signal above the set level is received, and sends a transmission command to the transmitter. Given the above base station and a relay control means for relaying radio communication between a mobile station, it antenna and mobile station for the antenna for the base station
Divide each into multiple antennas and relay the received signal from the receiver
Base station with the highest reception level monitored by the control means
Antenna and mobile station antenna
Automatic repeater of a mobile radio communication, wherein Rukoto. 4. The automatic relay apparatus for mobile radio communication according to claim 1, 2 or 3, wherein the relay control means has a relationship in which the first frequency and the second frequency are opposite to each other with respect to the receiver and the transmitter. An automatic relay device for mobile radio communication, characterized in that switching is set while maintaining the above. 5. The automatic relay device for mobile radio communication according to claim 1, 2, or 3, wherein the relay control means has a relationship in which the first frequency and the second frequency are opposite to each other with respect to the receiver and the transmitter. The automatic repeater for mobile radio communication is characterized in that the switching setting is performed while maintaining the above, and the switching frequency of the interference removing device is switched according to the set frequency of the transmitter.