JP3522225B2 - Radio apparatus and reception failure detection method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device in a base station of a mobile communication system, and more particularly to receiver failure detection.

[0002]

2. Description of the Related Art Conventionally, as a failure detection of a receiver, for example, Japanese Patent Laid-Open No. 10-276127 discloses a radio base station apparatus with a failure detection function and a mobile communication system using the same. According to this publication, the electric field monitoring receiver in the wireless base station device receives the downlink radio wave from the adjacent wireless base station device and detects the failure of the receiver. Further, Japanese Patent Laid-Open No. 7-30501 discloses a method that does not require a pilot signal as a method for detecting a failure of an outdoor receiving device.

[0003]

In the former system described above, since the base station devices need to communicate with each other at the time of detection, the system becomes large in scale, and an electric field monitoring receiver is additionally required. Become. Furthermore, since the environment between base stations is not always constant, the propagation loss may change, resulting in an error. Further, in the latter, the leakage power from the antenna duplexer is used when detecting the failure of the receiving amplifier, but in order to know the accurate leakage power, it is necessary to know the actual value of the attenuation amount of the antenna duplexer. . In some cases, the antenna duplexer is integrated with the receiving amplifier, and the manufacturers are not the same. In that case, it is possible to know the standard value of the attenuation amount of the antenna duplexer, but it is difficult to know the actual value. Further, the antenna duplexer is placed directly below the antenna and is connected to the receiver by a cable from there.
Since the amount of attenuation changes depending on the length of the cable, it is difficult to obtain an accurate amount of attenuation from this as well. In addition, JP-A-7-
In 30501, when detecting the failure of the receiving amplifier,
While another receiver (not shown) is receiving the received signal,
Failure detection is to be performed using a receiver for tuning and receiving the leakage power from the transmitter of the antenna duplexer. Therefore, when a failure is detected, one receiver is necessarily occupied by the failure detection, and the number of callable users is reduced.

An object of the present invention is to provide a receiver in a radio base station apparatus in a minimum necessary configuration without requiring a test apparatus, and to autonomously receive a receiver without reducing the number of callable users during an operating state. It is an object of the present invention to provide a wireless device capable of performing the above failure detection and a reception failure detection method thereof.

[0005]

The wireless device of the present invention is
Antenna and a duplexer that separates the transmitted and received signals.
Input the input signal, the transmitter that outputs the transmission signal, and the reception signal
Frequency converted to the received baseband signal frequency and output
Conversion circuit and reception input from this frequency conversion circuit
Baseband signal is the gain control signal of automatic gain control amplifier
Automatic gain control that amplifies and outputs power to a predetermined level by
In a wireless device including a receiver having an amplifier,
Input the transmission signal, output one to the antenna and send the other
A first coupler for outputting a signal monitor signal and the transmission monitor.
Switch signal for switching
A high-frequency switch that is conducted by a replacement signal, and the transmission monitor.
Second signal for inputting a digital signal and a received signal and outputting to the receiving section
A coupler and a baseband unit, and the baseband
And a reception unit that performs a failure determination of the reception unit and a reception unit.
A demodulation processing unit that inputs a baseband signal and performs demodulation processing,
Since the failure detection is performed at a predetermined time, the above
And a switch control unit that outputs a replacement signal. Said
Switch control unit outputs a timer control signal at a specified time
Timer circuit and a timer control signal from the timer circuit.
Signal and the timer control circuit that outputs the switching signal.
The failure detection unit is a reception base van from the reception unit.
Input signal to detect the received electric field value and the received electric field value information
And received electric field detection circuit that outputs received baseband signal
, The received electric field value information is input, and the gain control signal and
And gain value information output automatic gain control amplifier control circuit
And input the transmission baseband signal and detect the level.
Value information and transmit baseband signal
Level detection circuit and timer control from the switch controller
Control signal and obtain it from the gain value information and the received electric field value information.
Received by comparing the value displayed with the level value information
Failure determination circuit that determines the failure of a part and outputs a failure detection signal
With.

[0006]

The wireless device of the present invention includes an antenna,
In a wireless device having a filter, an antenna switching device, a transmission unit for outputting a transmission signal, and a reception unit for inputting a reception signal and a gain control signal of an automatic gain control amplifier, one transmission signal is input and one is input to the antenna. A first coupler that outputs a transmission signal and the other outputs a transmission monitor signal; a second coupler that inputs the transmission monitor signal and a reception signal and outputs the reception monitor signal; and a baseband unit, The baseband unit includes a failure detection unit that determines a failure of the reception unit, a demodulation processing unit that receives and demodulates a received baseband signal, and a failure detection unit that determines a failure of the reception unit. The failure detection unit inputs a reception baseband signal from the reception unit, detects a reception electric field value, outputs a reception electric field value information and a reception baseband signal, and inputs the reception electric field value information. An automatic gain control amplifier control circuit that outputs the gain control signal and gain value information, a level detection circuit that outputs level value information by inputting and detecting a transmission baseband signal and outputs a transmission baseband signal, and a failure A failure determination circuit that inputs a detection start signal and compares a value obtained from the gain value information and the received electric field value information with the level value information to determine a failure and output a failure detection signal.

In the reception failure detection method in the wireless device of the present invention, when the predetermined failure detection start time is reached, the timer circuit outputs the first timer control signal to the switch control circuit and the switch switching signal to the high frequency switch. , The high-frequency switch is turned on, the transmitting unit outputs the transmitting baseband signal, and the transmitted transmitting signal is distributed by the first coupler, and the main output is transmitted as the transmitting signal through the duplexer and the antenna. A transmission monitor signal is supplied from the other coupling-out output to the coupling input of the second coupler as a transmission monitor signal via the conductive high-frequency switch, and the other main input is fed from the antenna. The original received signal separated by the duplexer is input, and the two signals are combined and then received as the received signal. Is input to the failure determination circuit, the second timer control signal is output to the failure determination circuit, the input reception baseband signal is detected by the reception electric field detection circuit, and the reception electric field value information obtained by the detection is automatically gained. The automatic gain control amplifier control circuit is sent to the control amplifier control circuit and the failure judgment circuit, and the received electric field value is 0 from the received electric field value information sent.
In addition to outputting a gain control signal for controlling the gain of the automatic gain control amplifier of the receiving unit, the automatic gain control amplifier gain value information is sent to the failure determination circuit, and the level detection circuit transmits from the host device. The baseband signal is detected, and the level value information obtained by the detection is sent to the failure judgment circuit. The failure judgment circuit detects the level 0 dBm of the reception baseband signal from the voltage value of the reception electric field value information and the automatic gain control amplifier gain value. Automatic gain control amplifier expected from voltage value of information, level value Transmitted baseband signal level expected from voltage value of information and measured fixed reception rate of transmitter The difference between the amplifier gain value and the standard value of the receiving amplifier is calculated to determine whether or not there is a difference above a certain level. The timer circuit outputs the failure detection signal to the host device, and after the timer control signal is output, the timer circuit waits the failure determination circuit for a predetermined time, and after this time, sends the timer control signal to the failure determination circuit. ,
The failure determination circuit is operated to start the failure determination.

[0009]

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1, the wireless device includes an antenna 100 for both transmission and reception, a transmission signal S101, and a reception signal S.
A duplexer (to be referred to as a DUP hereinafter) 104 that separates 105, and a receiving side receives a reception baseband signal S109.
Is input and the transmission side outputs the transmission baseband signal S108 from the host device and the baseband unit 109 that outputs the failure detection signal S114 and the switch switching signal S104, and the transmission baseband signal S.
A transmitting unit 106 which receives 108 and sends it out as a transmission signal S100, a reception signal S106 and an automatic gain control amplifier (hereinafter referred to as AGCAMP) gain control signal S110.
Of the received signal and the received baseband signal S109 to the baseband unit 109, and the transmitted signal S10.
A coupler 101 that inputs 0, one outputs a transmission signal S101 to the antenna 100 and the other outputs a transmission monitor signal S102, a high-frequency switch (input a transmission monitor signal S102 and a switch switching signal S104, and conducts by this switch switching signal ( Hereinafter referred to as SW) 102
And a coupler 105 that inputs the transmission monitor signal S102 and the reception signal S105 and outputs the reception signal S105 to the reception unit 108.

The receiving unit 108 receives the received signal S106, converts it into a received baseband signal frequency and outputs it, and the received baseband signal inputted from the frequency converter circuit 120 to the AGCAMP gain control signal S.
AG that amplifies and outputs power to a predetermined level by 110
It is composed of a CAMP 121.

Next, referring to FIG. 1B, the baseband unit 109 includes a failure detection unit 149 and a demodulation processing unit 15.
0 and the switch control unit 151, and the failure detection unit 14
9 is a reception baseband signal S10 from the reception unit 108.
9 is input and an RSSI value is detected and RSSI value information S115
And a received electric field that outputs a received baseband signal (hereinafter referred to as RS
(Referred to as SI) detection circuit 145 and RSSI value information S
AGCAMP control circuit 144 which inputs 115 and outputs AGCAMP gain control signal S110 and gain value information S113, and level detection (hereinafter referred to as VDET) value information S11 by inputting and detecting a transmission baseband signal.
The VDET detection circuit 142 that outputs 2 and the transmission baseband signal S108, the timer control signal S116 from the switch control unit 151, and the value obtained from the AGCAMP gain value information S113 and the RSSI value information S115 and the VDET value information. A failure determination circuit 143 that determines a failure of the receiving unit by comparing with S112 and outputs a failure detection signal S114. The switch control unit 151
The demodulation processing unit 150 includes a timer circuit 147 that outputs a timer control signal S111 at a predetermined time and a switch control circuit 146 that inputs the timer control signal S111 from the timer circuit 147 and outputs a switch switching signal S104. A demodulation circuit 148 for receiving and demodulating a received baseband signal is provided.

Below, referring to FIG. 1 to FIG.
The operation of the embodiment will be described. First, the case of normal operation (when the failure detection unit 149 is OFF) will be described. Here, regarding the performance of each group of the wireless device, for example, the transmission unit 106 has a fixed amplification factor of 72 dB and a transmission power of 32 dBm,
The coupler 101 and the coupler 105 have a coupling degree of 70 dB, and the insertion loss between the main in-out is 0.0000001 d.
B (Ignore), DUP 104 loses 2
The insertion loss of the SW 102 is 1 dB, and the receiving unit 10
8 is a reception dynamic range of 50 dB (-123 dBm)
˜−73 dBm) and the noise figure is 4 dB, and the thermal noise level is −108 dBm (bandwidth 3.84 MHz, temperature 25 ° C.).

On the transmission side, the transmission baseband signal S108 from the host device is transmitted from the baseband unit 109 to the transmission unit 10.
6, and the transmission unit 106 transmits the transmission baseband signal S
108 is converted into a transmission signal S100 having a transmission power of 32 dBm and output, and the coupler 101 inputs the transmission signal S100 to output the transmission signal S101 from the main output and the transmission monitor signal S102 from the coupling out.
The transmission signal S101 is attenuated by 2 dB via the DUP 104 and the transmission power of 30 dBm is supplied to the antenna 100.

The receiving side inputs the received signal from the antenna 100 to the coupler 105 via the DUP 104, outputs the received signal S106 from the main output, and the receiving section 10
Output to 8. The reception unit 108 converts the reception signal S106 into a reception baseband signal S109, and outputs A from the AGCAMP control circuit 144 of the baseband unit 109.
By controlling the gain of the AGCAMP 121 of the reception unit 108 by the GCAMP gain control signal S110, the reception baseband signal S109 is input to the baseband unit 109 at a constant level of 0 dBm and demodulated by the demodulation circuit 148 of the demodulation processing unit 150. .

During the above-mentioned normal operation, the baseband section 10
9, the timer circuit 147 of the switch control unit 151 of No. 9 does not operate, and the switch control circuit 146 causes the switch switching signal S10
Since the switch 102 is disconnected to apply the OFF control to the SW 102, the transmission monitor signal S1 from the coupler 101 is disconnected.
02 is blocked and is not input to the receiving unit 108.

Next, the failure detection operation (when the failure detection unit 149 turns off)
An example will be described in detail. During failure detection operation, the receiver 1
08 gain excluding AGCAMP121, eg 80d
Within B ± 3 dB is defined as the standard value of the reception amplifier gain. At the predetermined failure detection start time, the timer circuit 147 sends the timer control signal S1 to the switch control circuit 146.
11 is output (in FIG. 2). Timer control signal S111
The switch control circuit 146 which has received the switch outputs the switch switching signal S104 to the SW 102 (in FIG. 2),
SW102 becomes conductive (in FIG. 2).

Next, the transmission unit 106 outputs the transmission baseband signal S108 and transmits the transmission signal S100.
Is distributed by the coupler 101, and the main output is transmitted as a transmission signal S101 via the DUP 104 and the antenna 100
Is supplied to. The transmission monitor signal S102 from the other coupling-out output is input to the coupling input of the coupler 105 as the transmission monitor signal S103 via the conducting SW102, and the antenna 10 is connected to the other main input.
Original received signal S separated by DUP 105 from 0
105 is input, the two signals are combined, and then the received signal S1
It is input to the receiving unit 108 as 06 (in FIG. 2).

Therefore, as the transmission monitor signal S103 component of the reception signal S106 input to the reception unit 108,
32 dBm-70 dB-1 dB-70 dB = -109 d
After Bm is tuned by the frequency conversion circuit 120 and converted into the reception baseband signal S109, the AGCAMP control circuit 14
4 is input to the baseband unit 109 at a constant 0 dBm in the AGCAMP 121 whose gain is controlled by the AGCAMP gain control signal S110.

Here, referring to the time chart at the time of failure detection shown in FIG. 3, after the failure detection start time is reached and the timer control signal S111 is output from the timer circuit 147, SW102 becomes conductive and the transmission monitor signal S103 is input. There is a delay until the failure is detected, and if the failure determination circuit 143 operates immediately after the failure detection is started, it will be determined as a failure.
Therefore, the timer circuit 147 sets the delay time to the offset time 1 and outputs the timer control signal S111, then causes the failure determination circuit 143 to wait for the offset time 1 and, after the offset time 1, sends the timer control signal S116 to the failure determination circuit 143. Failure determination circuit 14 for the first time by sending
3 is operated to start failure determination (in FIG. 2).

Input received baseband signal S109
Is detected by the RSSI detection circuit 145, and the detected RSSI value information S115 is the AGCAMP control circuit 144.
Is sent to the failure determination circuit 143, and the AGCAMP control circuit 144 receives the RSSI value information S115 from the sent RSSI value information S115.
AGCAM of the receiving unit 108 such that the I value becomes 0 dBm
The AGCAMP gain control signal S110 for controlling the gain of P121 is output, and the AGCAMP gain value information S113 is sent to the failure determination circuit 143.

On the other hand, the VDET detection circuit 142 detects the transmission baseband signal S108 from the host device and sends the VDET value information S112 obtained by the detection to the failure judgment circuit 143 (in FIG. 2). The failure determination circuit 143 receives the reception baseband signal S1 from the voltage value of the RSSI value information S115.
09 level 0 dBm and AGCAMP gain value information S11
The gain value of the AGCAMP 121 expected from the voltage value of 3 is 23 dB, and the level of the transmission baseband signal S108 expected from the voltage value of the VDET value information S112 is -40 dB.
Fixed amplification factor 72 of the transmission unit, which is predetermined as m
using dB,

[0024]

[Equation 1]

By comparing the fixed gain value of the receiving amplifier excluding the gain component of the AGCAMP 121 obtained from the above with the standard value,
It is judged whether or not there is a failure depending on whether a difference above a certain level is recognized. Applying the actual numerical value to the above equation (of Fig. 2) and attempting the calculation,

[0026]

[Equation 2]

From this, the actual gain value of 79.8 dB is obtained. Here, the standard value of the receiving amplifier gain is 80 dB ± 3 dB.
Since it is within the range, it can be determined that the receiving unit 108 is operating normally. If it is out of the standard value range, the failure detection signal S114 is output to the host device (in FIG. 2).

On the other hand, if it is determined to be normal, SW1
It is necessary to disconnect 02 to stop the failure determination circuit 143. However, before stopping the failure determination circuit 143, SW10
Since disconnection of 2 causes the failure determination circuit 143 to determine a failure, the SW 102 disconnects after stopping the failure determination circuit 143. Referring to the time chart at the time of fault detection shown in FIG. 3, the timer circuit 147 uses a timer to stop the fault determination circuit 143 after the offset time 2 where the time until the fault determination starts and ends is offset time 2. The control signal S116 is sent, and after the offset time 3, the switch control circuit 146 is sent by sending the timer control signal S111 to the switch control circuit 146.
Sends a switch switching signal S104, disconnects SW102, and sends a transmission monitor signal S10 to the receiving unit 108.
Shut off 3. (Of FIG. 2).

The receiving section 108 shifts to a normal operation by synchronizing with the original received signal S105, and the demodulation processing section 150
Starts demodulating the reception baseband signal S109 from the RSSI detection circuit 145 of the failure detection unit 149 in the demodulation circuit 148. It should be noted that during the failure detection operation, the original received signal S
Since 105 cannot receive or demodulate, the total time of offset time 1 + offset time 2 + offset time 3 in the time chart at the time of failure detection in FIG. It will be completed within a while and the normal operation will be started to minimize the deterioration of the call quality. The first embodiment described above is applied to a radio base station apparatus of the CDMA system, and all the figures show a state in which downlink transmission waves are transmitted.

Next, a second embodiment of the present invention will be described with reference to FIG. The failure detection in the above-described first embodiment is performed by TDD (Time Division).
The present invention can also be applied to a wireless device limited to the Duplex system.

A TDD-type radio apparatus is shown in FIG. 1A showing the configuration of the radio apparatus according to the first embodiment described above.
Then, the DUP 104 uses the filter 110 and the antenna switch 1
11 and the SW 102 is omitted. Further, the switch control unit 151 is omitted in FIG.

Referring to FIG. 4, the antenna 100, the filter 110, the antenna switch 111, and the transmission signal S
A transmitting unit 106 that outputs 100 and a receiving unit 108 that inputs the received signal and the gain control signal of the automatic gain control amplifier.
In a wireless device having a receiving unit 1, a coupler 101 for inputting a transmission signal S100, one for outputting a transmission signal to the antenna 100, and another for outputting a transmission monitor signal S102, and a receiver 101 for receiving a transmission monitor signal S102 and a reception signal S105.
08 to the coupler 105 and the baseband unit 109
a and. The baseband unit 109a includes the receiving unit 10
8, a failure detection unit 149a that performs failure determination, a demodulation processing unit 150 that receives and demodulates a received baseband signal,
A failure detection unit 149a that determines a failure of the reception unit 108 is included.

The fault detecting unit 149a receives the received baseband signal from the receiving unit 108, detects the received electric field value, and outputs the received electric field value information and the received baseband signal.
An SSI detection circuit 145, an AGCAMP control circuit 144 that receives the received electric field value information and outputs the gain control signal and the gain value information, and a level value information that is output by inputting and detecting the transmission baseband signal and the transmission baseband A VDET detection circuit 142 that outputs a signal, and a fault that outputs a fault detection signal by inputting a fault detection start signal and comparing a value obtained from gain value information and received electric field value information with level value information. The determination circuit 143a is provided.

Next, the operation of the second embodiment will be described.

Since it is a TDD type wireless device, in normal operation (when the failure detection unit 149a is OFF), only the transmission unit 106 operates during transmission, and the transmission monitor signal S102 is output to the reception unit 108. 108 is down and will not be received. When receiving, the transmission unit 106 stops,
Only the receiving unit 108 operates and receives the reception signal S105. Next, failure detection operation (when failure detection unit 149a is ON)
The case will be described.

In the failure detection operation, when the transmission unit 106 is operating, the transmission monitor signal S102 is received by the reception unit 106 by operating the reception unit 108 that is originally stopped, and the above-mentioned first Fault detection similar to that described in the embodiment is performed. However, in this case, the failure detection start signal is directly input to the failure determination circuit 143a at an arbitrary time instead of the switch control circuit shown in the first embodiment.

[0037]

As described above, according to the present invention, since the wireless device autonomously detects a failure during operation, a process involving an operator such as connecting a test device to the wireless device is not required. In addition, since the transmission signal from the transmission unit is used, the cost can be reduced because a device for generating a special pilot signal is not used. Further, since failure detection is completed within a time that does not result in disconnection of the call at any time during operation, as a result, failure detection can be performed at any time, and operation is stopped or the receiving unit is installed in the device. Failure detection can be performed without disconnecting from. Therefore, the total number of calling users does not decrease.

[Brief description of drawings]

FIG. 1A is a block diagram showing a wireless device according to a first embodiment of the present invention. (B) is a block diagram showing details of the baseband section in (a).

FIG. 2 is a flowchart for explaining a failure detection operation of the wireless device according to the first embodiment of the present invention.

FIG. 3 is a time chart showing a timer signal and a timer control signal in the failure detection operation of the wireless device according to the first embodiment of the present invention.

FIG. 4A is a block diagram showing a wireless device according to a second embodiment of the present invention. (B) is a block diagram showing details of the baseband section in (a).

[Explanation of symbols]

100 antenna 101,105 coupler 102 SW 106 transmitter 108 Receiver 109, 109a Base band part 110 filters 111 Antenna switch 120 frequency conversion circuit 121 AGCAMP 142 VDET detection circuit 143, 143a Failure determination circuit 144 AGCAMP control circuit 145 RSSI detection circuit 146 switch control circuit 147 timer circuit 148 demodulation circuit 149, 149a Failure detection unit 150 Demodulation processing unit 151 switch control unit

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (4)

(57) [Claims] 1. An antenna, a duplexer for separating a transmission signal and a reception signal, a transmission section for outputting the transmission signal, a frequency conversion circuit for inputting the reception signal and converting it to a reception baseband signal frequency, and a frequency thereof. In a radio apparatus including a receiving unit having an automatic gain control amplifier that amplifies a received baseband signal input from a conversion circuit to a predetermined level by a gain control signal of the automatic gain control amplifier and outputs the amplified signal, A first coupler that outputs to the antenna and the other outputs a transmission monitor signal; a high-frequency switch that inputs the transmission monitor signal and a switching signal for switching the switch and conducts by the switching signal; and the transmission monitor signal. A second coupler for receiving a received signal and outputting the received signal to the receiving unit; Is a failure detection unit that determines a failure of the reception unit, a demodulation processing unit that inputs and demodulates a received baseband signal, and a switch control unit that outputs the switching signal to perform failure detection at a predetermined time. Wherein the switch control unit includes a timer circuit that outputs a timer control signal at a predetermined time, and a timer control circuit that inputs the timer control signal from the timer circuit and outputs the switching signal, The failure detection unit receives the reception baseband signal from the reception unit, detects the reception electric field value, outputs the reception electric field value information and the reception baseband signal, and the reception electric field value information and inputs the reception electric field value information. An automatic gain control amplifier control circuit that outputs a gain control signal and gain value information, and outputs and transmits level value information by inputting and detecting a transmission baseband signal Failure of the receiving unit by inputting a timer control signal from the switch control unit and a level detection circuit that outputs a swath signal and comparing the value obtained from the gain value information and the received electric field value information with the level value information. And a failure determination circuit that outputs a failure detection signal. 2. A transmission signal in a radio apparatus having an antenna, a filter, an antenna switcher, a transmission section for outputting a transmission signal, and a reception section for inputting a reception signal and a gain control signal of an automatic gain control amplifier. A first coupler which outputs a transmission signal to the antenna and one outputs a transmission monitor signal to the antenna, a second coupler which inputs the transmission monitor signal and the reception signal and outputs the reception monitor signal to the receiving unit, A baseband section, the baseband section includes a failure detection section that determines a failure of the reception section, a demodulation processing section that receives and demodulates a received baseband signal, and a failure that determines a failure of the reception section. A detection unit, wherein the failure detection unit receives the reception baseband signal from the reception unit, detects the reception electric field value, and outputs the reception electric field value information and the reception baseband signal. A circuit, an automatic gain control amplifier control circuit for inputting the received electric field value information and outputting the gain control signal and gain value information, and a level value information output by inputting and detecting a transmission baseband signal and a transmission base A level detection circuit that outputs a band signal, and inputs a failure detection start signal, compares the value obtained from the gain value information and the received electric field value information with the level value information, determines a failure, and outputs a failure detection signal. And a failure determination circuit for performing wireless communication. 3. The timer circuit outputs a first timer control signal to the switch control circuit at a predetermined failure detection start time, outputs a switch switching signal to the high frequency switch, and turns on the high frequency switch, The transmission signal output and transmitted by the transmission unit is distributed by the first coupler, and the main output is supplied as a transmission signal to the antenna via the duplexer.
The transmission monitor signal from the other coupling-out output is input to the coupling input of the second coupler as the transmission monitor signal via the high-frequency switch that is conducted, and the other main input is separated by the duplexer from the antenna. The original received signal that has been input is input, the two signals are combined, and then input to the receiving unit as a received signal, the timer circuit outputs the second timer control signal to the failure determination circuit, and the input received baseband signal Is detected by the received electric field detection circuit, the received electric field value information obtained by detection is sent to the automatic gain control amplifier control circuit and the failure judgment circuit, and the automatic gain control amplifier control circuit uses the received electric field value information sent. A gain control signal for controlling the gain of the automatic gain control amplifier of the receiving unit such that the received electric field value becomes 0 dBm is output, and the automatic gain control is performed. The amplifier gain value information is sent to the failure judgment circuit, the level detection circuit detects the transmission baseband signal from the higher-level device, and the detected level value information is sent to the failure judgment circuit. Level 0 dBm of received baseband signal from voltage value of value information and gain value of automatic gain control amplifier expected from voltage value of automatic gain control amplifier gain value information, transmission baseband expected from voltage value of level value information Using the signal level and a fixed fixed amplification factor of the transmitter, determine the difference between the measured receiver amplifier gain value and the receiver amplifier standard value, and determine whether or not there is a difference above a certain level to determine whether or not there is a failure. Judge,
A reception failure detection method in a wireless device, wherein a failure detection signal is output to a higher-level device when it is out of the standard value range. 4. The timer circuit, after outputting a timer control signal, causes the failure determination circuit to wait for a predetermined time, and after this time, sends a timer control signal to the failure determination circuit,
The method of detecting a reception failure in a wireless device according to claim 3, wherein the failure determination circuit is operated to start the failure determination.