JP2003309512A - Radio communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent signal to be transmitted in relay from being subjected to demodulation and modulation processings in a radio communication terminal for communicating with a base station on one occasion, and for relaying the communication between the base station and another radio communication terminal on another occasion. <P>SOLUTION: In the radio communication terminal 10 for transferring radio electric waves between the base station and another radio communication terminal, a control section 125 controls an antenna 111 for relaying transmission waves and an antenna 155 for relaying reception waves. When radio communication transmission with the base station is to be made by the control, a modulation section 120-a transmission/reception antenna 101, and a demodulation section 150-a transmission/reception antenna 101 can be used. Additionally, when the radio communication between another radio communication terminal and the base station is to be relayed, the antenna 111 for relaying transmission waves, a high-frequency variable gain amplifier 108, the antenna 155 for relaying reception waves, a variable gain type low-noise amplifier 153, the transmission/ reception antenna 101, and the like can be used. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to communication with a base station,
And a wireless communication terminal that relays communication between a base station and another wireless communication terminal.
It is suitable for use in multi-hop communication according to e).

[0002]

2. Description of the Related Art Conventionally, a communication system in which a base station and a terminal perform wireless communication such as PDC has been widely used. In FIG.
A typical example of the configuration of the wireless communication terminal 100 used in such a wireless communication system is shown. This wireless communication terminal 1
00 is a transmitting / receiving antenna 101, a duplexer 102,
Isolator 103, directional coupler 104, detector 10
5, power module 106, transmission high frequency BPF 107
a, transmission high frequency BPF 107b, high frequency variable gain amplifier 108, modulator 120, transmission mixer 121, transmission IF
Band BPF 122, control unit 125, baseband signal processing unit 130, demodulation unit 150, low noise amplifier 151, reception high frequency BPF 152, variable gain type low noise amplifier 153, reception mixer 156, reception IF band BPF 157,
The wireless transmission unit power supply control circuit 210 and the wireless reception unit power supply control circuit 220 are included.

Modulation section 120 modulates the signal received from baseband signal processing section 130 to transmit IF band BPF1.
22 is output.

The transmission IF band BPF 122 includes a modulator 120.
Is a band-pass filter that removes unnecessary frequency components from the output signal of and outputs the signal from which the unnecessary components are removed to the transmission mixer 121.

The transmission mixer 121 has a transmission IF band BPF1.
The output of 22 is multiplied by the local oscillation signal to generate an RF (radio frequency) band signal, and the multiplied signal is output to the transmission high frequency BPF 107a.

The transmission high frequency BPF 107a removes unnecessary frequency components from the signal output from the transmission mixer 121,
It is a bandpass filter that outputs the signal from which this unnecessary component is removed to the high frequency variable gain amplifier 108.

The high frequency variable gain amplifier 108 is an amplifier for amplifying the signal output from the transmission high frequency BPF 107a and outputting it to the transmission high frequency BPF 107b. Further, the high frequency variable gain amplifier 108 is designed so that the output gain is variable.

The transmission high frequency BPF 107b is a bandpass filter for removing an unnecessary frequency component from the signal output from the high frequency variable gain amplifier 108 and outputting the signal from which the unnecessary component is removed to the power module 106.

The power module 106 has a transmission high frequency B.
Directional coupler 1 that amplifies the signal output from PF 107b
It is an amplifier which outputs to 04.

The directional coupler 104 receives a signal from the power module 106, demultiplexes the signal, and outputs the demultiplexed signal to the detector 105 and the isolator 103. A terminating resistor of 50Ω is connected to the directional coupler 104.

The detector 105 receives a signal from the directional coupler 104 and notifies the control unit 125 of the signal level of the signal.

The isolator 103 is a directional coupler 10.
4 to the isolator 103, while blocking the signal from the duplexer 102 to the directional coupler 104.

The duplexer 102 is an isolator 10.
The signal received from 3 is output to the transmitting / receiving antenna 101,
In addition, a signal received from the transmitting / receiving antenna 101 is output to the low noise amplifier 151.

The low noise amplifier 151 amplifies the signal received from the duplexer 102 to receive high frequency BPF1.
It is an amplifier which outputs to 52.

The reception high frequency BPF 152 is a bandpass filter that removes unnecessary frequency components from the signal output by the low noise amplifier 151 and outputs the signal from which the unnecessary components are removed to the variable gain type low noise amplifier 153.

The variable gain type low noise amplifier 153 is
It is an amplifier that amplifies the signal output from the reception high frequency BPF 152 and outputs the amplified signal to the reception mixer 156. The variable gain type low noise amplifier 153 has a variable output gain.

The reception mixer 156 multiplies the output of the variable gain type low noise amplifier 153 by the local oscillation signal to obtain I
An F (intermediate frequency) band signal is generated, and this multiplied signal is output to the reception IF band BPF 157.

The reception IF band BPF 157 is the reception mixer 1.
This is a bandpass filter that removes unnecessary frequency components from the signal output by 56 and outputs the signal from which the unnecessary components have been removed to the demodulation unit 150.

The demodulation section 150 has a reception IF band BPF 157.
Demodulates the signal output by to convert to a baseband signal,
The baseband signal processing unit 130 converts this baseband signal.
Is output to.

The baseband signal processing unit 130 performs processing such as rearrangement, decompression, and decoding on the received data received from the demodulation unit 150, and after converting the data into a format that can be processed by the control unit 125, It is output to the control unit 125. In addition, the data output from the control unit 125 is rearranged, compressed, encoded, and the like, and the data is generated based on an instruction from the control unit 125.
These are output to the modulator 120 as transmission data.

The control unit 125 is a processing device that generates data for wireless communication by a predetermined process and outputs the data to the baseband signal processing unit 130. In addition, the control unit 125
Performs predetermined processing on the data received from the baseband signal processing unit 130. The control unit 125 receives the signal level notification from the detector 105 and detects the signal level in the directional coupler 104 based on the notification.

The radio transmitter power supply control circuit 210 includes a modulator 120, a transmission mixer 121, and a high frequency variable gain amplifier 1.
08, and a circuit that controls the power supply for the operation of the power module 106.

The radio receiver power control circuit 220 is a circuit for controlling power supply for operating the demodulator 150, the receiving mixer 156, the variable gain low noise amplifier 153, and the low noise amplifier 151.

In the wireless communication terminal 100 configured as described above, when the wireless communication terminal 100 receives a wireless signal, the signal received via the transmitting / receiving antenna 101 and the duplexer 102 is a low noise amplifier 151 and a receiving high frequency BPF 152. , Variable gain type low noise amplifier 15
Amplified by 3. Further, the amplified signal is transmitted to the IF by the reception mixer 156 and the reception IF band BPF 157.
Down-converted to a band signal. The down-converted signal is demodulated by the demodulation section 150 and processed by the baseband signal processing section 130 and the control section 125.

When the wireless communication terminal 100 sends out a wireless signal, the data processed and generated by the control unit 125 and the baseband signal processing unit 130 is modulated by the modulation unit 120.
And the modulated signal is modulated in the transmission IF band BPF1.
22, the transmission mixer 121, and the transmission high frequency BPF 107a are up-converted to RF band signals. The up-converted signal is amplified by the high frequency variable gain amplifier 108, the transmission high frequency BPF 107b, and the power module 106. Most of this amplified signal is generated by the directional coupler 104 and the isolator 10.
3, transmitted via the duplexer 102 and the transmission / reception antenna 101 as a radio signal. A part of the amplified signal is received by the detector 105 via the directional coupler 104.

The radio communication terminal 100 can communicate with the base station by carrying out such reception and transmission operations.

In recent years, multi-hop communication, which is a communication technique for relaying communication between a base station and a terminal with another wireless communication terminal, has been studied and developed by various companies and organizations. If this multi-hop communication is applied to a cellular type wireless communication system, even a wireless communication terminal that is not within the coverage area of the base station itself and cannot directly communicate with this base station,
It becomes possible to communicate with this base station by relaying another wireless communication terminal.

For this multi-hop communication, it is necessary for the wireless communication terminal to have a relay function in addition to the normal communication function with the base station. As such a wireless communication terminal,
There is a wireless communication terminal described in JP-A-7-38492. The wireless communication terminal performs normal communication at some times and relays communication between other wireless communication terminals and base stations (or between other wireless communication terminals) at other times. This communication device receives a signal for relaying, demodulates it, and then modulates the demodulated signal as it is,
This modulated signal is transmitted as a radio wave.

When this relay operation is applied to the wireless communication terminal 100 shown in FIG. 8, the operation is as follows. The signal received for relay is demodulated by the demodulation unit 150, the demodulated data is written in the control unit 125, the baseband signal processing unit 130, or a memory (not shown), and when the signal is transmitted, the written data is written. Is read again, modulated by the modulator 120, and then transmitted as a radio signal.

[0030]

[Problems to be Solved by the Invention]
A wireless communication terminal that performs demodulation and modulation processing on a signal received for relay and transmits the signal cannot perform transmission at the same timing as reception because the demodulation and modulation processing takes time. Therefore, the timing of transmitting the signal received for relay is adjusted. Therefore, until the timing comes, it is necessary to save the data for relay in the memory, which causes a problem that the configuration becomes complicated.

In view of the above points, the present invention is a wireless communication terminal that communicates with a base station at one time and relays communication between the base station and another wireless communication terminal at another time, and transmits at the time of relay. The signal to be processed is intended not to be demodulated and modulated.

[0032]

In order to achieve the above object, the invention according to claim 1 is a radio communication terminal for exchanging radio waves with a base station and another radio communication terminal. An antenna, a modulator that modulates a received baseband signal and outputs the modulated baseband signal for wireless transmission, and an output side of the modulator that amplifies the received signal and outputs the amplified signal for wireless transmission. A transmission amplifier for outputting to an antenna, and a first
On the input side of the transmission amplification section, which is on the output side of the reception amplification section, which amplifies and outputs the signal received from the antenna, and which demodulates the received signal and outputs the baseband signal. A second antenna which is present and is not on the input side of the modulation section, a third antenna which is on the output side of the reception amplification section and is not on the output side of the demodulation section, and when performing radio transmission to the base station, the modulation section , A transmission amplification unit and a first antenna can be used, and a demodulation unit, a reception amplification unit, and a first antenna can be used when performing radio reception from a base station, and another wireless communication terminal can use a base station. When relaying wireless transmission to the station, the second antenna, the transmission amplification unit,
Transmitting / relaying so that the first antenna can be used and when the wireless transmission from the base station to another wireless communication terminal is relayed, the third antenna, the reception amplification section, and the first antenna can be used And a means for wireless communication.

According to the present invention, when performing radio transmission to the base station, the transmitting / receiving / relaying means enables the modulating section, the transmitting / amplifying section, and the first antenna so that the base section received by the modulating section can be used. The band signal is modulated and output for wireless transmission, and the transmission amplification unit amplifies and outputs it to the first antenna, so that wireless transmission can be performed. Further, when performing radio reception from the base station, the transmitting / receiving / relaying means enables the demodulation section, the reception amplification section, and the first antenna so that the reception amplification section amplifies the signal received from the first antenna. Then, the demodulation section demodulates it and outputs a baseband signal, so that wireless reception is possible. Further, when relaying wireless transmission from another wireless communication terminal to the base station, the transmitting / receiving / relaying means uses the second antenna, the transmission amplification section, the first amplification section.
Since the signal received from the second antenna is amplified and output to the first antenna by making the antenna of No. 2 available, the relay can be performed without interposing the modulation unit and the demodulation unit. Further, when relaying wireless transmission from the base station to another wireless communication terminal, the transmitting / receiving / relaying means makes the third antenna, the receiving / amplifying unit, and the first antenna usable so that the first antenna can be used. Since the signal received from the antenna is amplified by the reception amplification section and output to the third antenna, the relay can be performed without interposing the modulation section and the demodulation section. Therefore, in a wireless communication terminal that communicates with the base station at one time and relays communication between the base station and another wireless communication terminal at another time, a signal transmitted at the time of relay is subjected to demodulation and modulation processing. It seems that it has not been applied.

The invention described in claim 2 is the same as claim 1
In the wireless communication terminal described in (1), the transmitting / receiving / relaying means is
When performing radio transmission to the base station, the transmission amplification unit should be connected to the output side of the modulation unit, and when performing radio reception from the base station, the reception amplification unit should be connected to the input side of the demodulation unit. When relaying wireless transmission from another wireless communication terminal to the base station, the second antenna is connected to the input side of the transmission amplification section, and the modulation section is cut off from the transmission amplification section. When relaying wireless transmission from a station to another wireless communication terminal, a third antenna is connected to the output side of the reception amplification section, and the demodulation section is cut off from the reception amplification section. .

The invention described in claim 3 is the same as claim 1
Alternatively, in the wireless communication terminal described in 2, the transmitting / receiving / relaying unit causes the modulation unit to be supplied with power when performing wireless transmission to the base station, and supplies the demodulation unit with power when performing wireless reception from the base station. Is supplied, and when relaying wireless transmission from another wireless communication terminal to the base station, power is not supplied to the modulator, and wireless transmission from the base station to another wireless communication terminal is performed. It is characterized in that power is not supplied to the demodulation unit when relaying.

The invention according to claim 4 is the same as claim 1
In the wireless communication terminal according to any one of 1 to 3, a first narrow band pass filter, which is located between the second antenna and the transmission amplification unit and blocks signals other than a frequency band of a specific channel, A second narrow band pass filter, which is provided between the third antenna and the reception amplification unit and blocks signals other than the frequency band of the specific channel, is provided.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) FIG. 2 is a schematic view showing a state in which a wireless communication terminal 10 according to a first embodiment of the present invention is mounted on a vehicle. The wireless communication terminal 10 has three antennas, a transmission / reception antenna 101, a transmission wave relay antenna 111, and a reception wave relay antenna 155. The transmission / reception antenna 101 is attached to a vehicle rearview mirror portion, and the transmission wave relay antenna 111 is attached. The received wave relay antenna 155 is attached to the left and right of the rear part of the vehicle.

FIG. 1 shows the configuration of the radio communication terminal 10 as a block diagram. This wireless communication terminal 10 is HDR
(High Data Rate) communicates with the base station and relays communication between the base station and other wireless communication terminals. In this relay, the wireless communication terminal 1
0 is designed to send a signal received for relay without demodulating and modulating it. In the wireless communication terminal 10 according to the present embodiment, the same components as those of the wireless communication terminal 100 shown in FIG. 8 as a conventional technique have the same reference numerals as those in FIG. However, the description thereof will be omitted.

The radio communication terminal 10 includes a transmitting / receiving antenna 101, a duplexer 102, an isolator 103, a directional coupler 104, a detector 105, and a power module 1.
06, transmission high frequency BPF 107a, transmission high frequency BPF1
07b, high frequency variable gain amplifier 108, transmission high frequency switch 110, transmission wave relay antenna 111, modulator 1
20, transmission mixer 121, control unit 125, baseband signal processing unit 130, transmission high frequency unit power supply control circuit 140,
Reception high frequency section power supply control circuit 141, transmission IF section power supply control circuit 142, reception IF section power supply control circuit 143, demodulation section 1
50, low noise amplifier 151, reception high frequency BPF15
2, variable gain type low noise amplifier 153, reception high frequency switch 154, reception wave relay antenna 155, reception mixer 156, reception IF band BPF 157, and control unit 1.
25.

In the configuration of this wireless communication terminal 10, the difference from the wireless communication terminal 100 shown in FIG. 8 is that a transmission high frequency switch 110 and a transmission wave relay antenna 111 are provided between a transmission mixer 121 and a transmission high frequency BPF 107a.
Variable gain type low noise amplifier 1
The receiving high frequency switch 1 is provided between the receiving device 53 and the receiving mixer 156.
54 and the reception wave relay antenna 155 are arranged. Further, the wireless transmission unit power control circuit 210 and the wireless reception unit power control circuit 22 in the wireless communication terminal 100.
Instead of 0, the transmission high frequency unit power supply control circuit 140, the reception high frequency unit power supply control circuit 141, the transmission IF unit power supply control circuit 142, and the reception IF unit power supply control circuit 143 supply power to the respective units of the wireless communication terminal 10.

The transmission high frequency switch 110 is a switch having three terminals. The transmission wave relay antenna 111 is connected to one terminal, the transmission high frequency BPF 107a is connected to another terminal, and the transmission mixer 121 is connected to the other terminal. In the transmission high frequency switch 110, by switching the connection state between these terminals, the transmission high frequency BPF 107a and the transmission mixer 121 are connected and the transmission high frequency BPF 107a and the transmission wave relay antenna 111 are connected. It is designed so that it can be switched to the existing state. Further, the transmission high frequency switch 110 receives a control signal from the control unit 125, and switches between the states described above based on this control signal.

The transmission high frequency switch 154 is a switch having three terminals. The transmission wave relay antenna 155 is connected to one terminal, the reception mixer 156 is connected to another terminal, and the variable gain low noise amplifier 153 is connected to the other terminal. The reception high frequency switch 154 has a state in which the variable gain type low noise amplifier 153 and the reception mixer 156 are connected by switching the connection state between these terminals, and a variable gain type low noise amplifier 153 and the reception wave relay antenna. 155 and the state where it is connected are switched. Further, the reception high frequency switch 154 receives a control signal from the control unit 125 and switches between the states described above based on the control signal.

The transmission high frequency unit power supply control circuit 140 is a circuit for controlling power supply for operating the power module 106 and the high frequency variable gain amplifier 108. Further, the transmission high frequency unit power supply control circuit 140 receives a control signal from the control unit 125 and controls power supply to the power module 106 and the high frequency variable gain amplifier 108 based on this control signal.

The reception high frequency section power supply control circuit 141 includes a low noise amplifier 151 and a variable gain type low noise amplifier 1.
It is a circuit that controls the power supply for the operation of 53. Further, the reception high frequency unit power supply control circuit 141 receives a control signal from the control unit 125, and based on this control signal, the low noise amplifier 151 and the variable gain type low noise amplifier 153.
It is designed to control the power supply to.

The transmission IF section power supply control circuit 142 is a circuit for controlling power supply for operating the modulation section 120 and the transmission mixer 121. Further, the transmission IF unit power supply control circuit 142
Receives a control signal from the control unit 125 and controls the power supply to the modulation unit 120 and the transmission mixer 121 based on this control signal.

The reception IF power supply control circuit 143 is a circuit for controlling the power supply for the operation of the demodulation unit 150 and the reception mixer 156. Further, the reception IF unit power supply control circuit 143
Receives a control signal from the control unit 125, and controls power supply to the demodulation unit 150 and the reception mixer 156 based on the control signal.

In the radio communication terminal 10 having such a configuration, the transmission wave relay antenna 111 has the transmission high frequency BPF.
It can be said that it is on the input side of 107a and not on the input side of the modulator 120. In addition, the reception wave relay antenna 1
It can be said that 55 is on the output side of the variable gain low noise amplifier 153 and not on the output side of the demodulation section 150.

Here, in the radio communication terminal 10 having the above-mentioned configuration, the transmission high frequency switch 110 is switched to the state in which the transmission high frequency BPF 107a and the transmission mixer 121 are connected, and the reception high frequency switch 15 is also provided.
4 has been switched to a state in which the variable gain type low noise amplifier 153 and the reception mixer 156 are connected, and the transmission high frequency section power supply control circuit 140, the reception high frequency section power supply control circuit 141, the transmission IF section power supply control circuit 142, and When power is supplied from the reception IF power supply control circuit 143, normal communication is performed as in the wireless communication terminal 100 shown in FIG. 8, that is, communication between the base station and the wireless communication terminal 10 is performed. Can be done.

Further, the transmission high frequency switch 110 is switched to a state in which the transmission high frequency BPF 107a and the transmission mixer 121 are connected, and power is supplied from the transmission high frequency section power supply control circuit 140 and the transmission IF section power supply control circuit 142. In some cases, the wireless communication terminal 10 can perform transmission in normal communication.

Further, the reception high frequency switch 154 is switched to a state in which the variable gain type low noise amplifier 153 and the reception mixer 156 are connected, and the reception high frequency section power supply control circuit 141 and the reception IF section power supply control circuit 14 are connected.
When power is supplied from the wireless communication terminal 3, the wireless communication terminal 10 can perform reception in normal communication.

Further, when the transmission high frequency switch 110 is switched to the state where the transmission wave relay antenna 111 and the transmission high frequency BPF 107a are connected, and when power is supplied from the transmission high frequency unit power supply control circuit 140,
It is possible to relay a radio wave from another terminal to the base station, that is, a transmission wave. This is the transmission wave relay antenna 11
The transmitted wave received by 1 is the transmitted high frequency BPF 107.
a, high frequency variable gain amplifier 108, transmission high frequency BPF
107b, amplified through the power module 106,
This is also because the amplified signal is transmitted from the transmitting / receiving antenna 101 via the directional coupler 104, the isolator 103, and the duplexer 102. At this time, the transmitted wave is
It is relayed without being frequency down-converted, frequency up-converted, demodulated and modulated in the wireless communication terminal 10.

Further, when the reception high frequency switch 154 is switched to a state in which the reception wave relay antenna 155 and the variable gain type low noise amplifier 153 are connected, and when power is supplied from the reception high frequency section power supply control circuit 141. Can relay a radio wave from the base station to another terminal, that is, a received wave. This is because the received wave received by the transmitting / receiving antenna 101 is the duplexer 102.
Passing through the low noise amplifier 151, the reception high frequency BPF
This is because the signal amplified by the 152 and the variable gain type low noise amplifier 153 and the amplified signal is transmitted from the reception wave relay antenna 155. At this time, the transmitted wave is
It is relayed without being frequency down-converted, frequency up-converted, demodulated and modulated in the wireless communication terminal 10.

Next, the operation of the radio communication terminal 10 for switching between transmission, reception, transmission wave relay, and reception wave relay in normal communication as described above will be described.

In HDR, time is divided into units called slots for communication. During this slot, each communication terminal uses the one allocated from the base station that schedules the communication timing for communication.

FIG. 3 shows a chart showing an example of communication timing of the wireless communication terminal 10. The horizontal axis in the figure is the time direction. Among the divided slots, the slot corresponding to the time zone of the higher part of the line plotted at the top of the figure is the communication for the wireless communication terminal 10 to communicate with the base station. The other slots are empty slots, and relay can be performed in this empty slot. This empty slot is designed to increase or decrease depending on the communication situation such as the amount of transfer data of the wireless communication terminal 10.

The wireless communication terminal 10 uses this empty slot for relaying. When relaying, the transmission high frequency switch 110 and the reception wave relay antenna 155 are controlled in accordance with a predetermined timing, and the transmission high frequency unit power supply control circuit 140 and the reception high frequency unit power supply control circuit 14
1. Control the transmission IF section power supply control circuit 142 and the reception IF section power supply control circuit 143. The predetermined timing and control will be described later in detail.

The decision as to which slot the radio communication terminal 10 will use for communication and which slot for relaying will be determined by negotiation with the base station. The slot for this negotiation is secured according to a predetermined standard. FIG. 4 is a flowchart showing a process in which the control unit 125 of the wireless communication terminal 10 determines the relay timing in this negotiation.

The base station is adapted to obtain the information about the wireless communication terminals which need to be relayed by the negotiation with each wireless communication terminal. Wireless communication terminal 10
The control unit 125 of receives the above information from this base station,
Based on this information, it is determined whether or not there is a wireless communication terminal in the vicinity of which a relay is necessary (step 41).
0).

If it is determined that there is no wireless communication terminal that requires relaying, the control unit 125 controls so that only the communication between the wireless communication terminal 10 and the base station is performed (step 490). Then, the process returns to step 410.

If it is determined that there is a wireless terminal that needs to be relayed, the controller 125 determines whether or not it has an empty slot that can relay the transmitted wave (step 420).

If it is determined that the base station has it, the control section 125 notifies the base station of the section of the empty slot for relaying the transmission wave (step 430). Then, based on this notification, the base station notifies the control unit 125 of the relay timing of the transmission wave created by performing the scheduling, and the control unit 125 receives it (step 44).
0). Then, the process proceeds to step 460.

If it is determined in step 420 that there is no slot for relaying the transmitted wave, the controller 125 determines whether or not it has an empty slot for relaying the received wave (step 460). If it is determined that the user does not have it, the process proceeds to step 480.

If it is determined that the wireless communication terminal has it, the control unit 125 notifies the base station of the section of the empty slot for relaying the received wave (step 465). Then, based on this notification, the base station notifies the control unit 125 of the relay timing of the received wave created by performing the scheduling, and the control unit 125 receives it (step 470).
Then, the process proceeds to step 480, and the control unit 125 controls the transmission high frequency switch 110, the reception high frequency switch 154, and the transmission high frequency unit power supply based on the timings of the transmission wave relay and the reception wave relay notified in step 440 and step 470. Circuit 140, reception high frequency unit power supply control circuit 141, transmission IF unit power supply control circuit 142, reception IF
The power supply control circuit 143 is controlled. This control will be described later. Then, the process returns to step 410.

As described above, the control unit 125 of the radio communication terminal 10 notifies the base station of the empty slot information for relay, the base station schedules the relay timing based on it, and notifies the control unit 125 of it. Control unit 12
Reference numeral 5 controls the switch and the power supply control circuit based on it, and relays according to the timing.

The transmission high frequency switch 110, the reception high frequency switch 154, the transmission high frequency unit power supply control circuit 140, and the reception high frequency unit power supply control circuit 14 which are executed by the control unit 125.
1. The control processing of the transmission IF unit power supply control circuit 142 and the reception IF unit power supply control circuit 143 is shown as a flowchart in FIG.

As described with reference to the flowchart of FIG. 4, the control unit 125 receives the notification of the timing of relay and communication from the base station. Based on this notification, the control unit 125 first performs transmission in normal communication between the base station and the wireless communication terminal 10 in the current slot, or relays a transmission wave, that is, performs transmission control, or receives in normal communication. , Or relay of the received wave, that is, whether to perform reception control is determined (step 50). If it is determined that the transmission control is performed, the process proceeds to step 505, and if it is determined that the reception control is performed, the process proceeds to step 550.

In the first processing on the transmission control processing side, that is, the processing of step 505, the control unit 125 determines whether or not to start transmission by normal communication. If it is determined not to start, the process proceeds to step 525.

If it is determined to start, the control unit 125 controls the transmission high frequency switch 110 to transmit the transmission high frequency BPF1.
07a and the transmission mixer 121 are connected to each other (step 507). Then, the transmission high frequency unit power supply control circuit 140, the reception high frequency unit power supply control circuit 141,
The transmission IF section power supply control circuit 142 and the reception IF section power supply control circuit 143 are controlled so that power is supplied to the transmission high frequency section power supply control circuit 140 and the transmission IF section power supply control circuit 142, and the other power supply is stopped (step 510). ). As a result, the modulation unit 120, the transmission mixer 121, the high frequency variable gain amplifier 108, and the power module 106 operate by receiving power supply, and the transmission high frequency switch 110 makes the transmission signal line from the transmission / reception antenna 101 to the control unit 125 conductive. , It becomes possible to perform transmission in normal communication.

This communication is continued until it is determined in step 515 that the transmission is to be terminated, and when it is determined to be terminated, the process proceeds to step 525.

In the processing of step 525, the control unit 125 determines whether or not to start relaying the transmitted wave. If it is determined not to start, the process returns to step 500.

If it is determined to start, the control unit 125 controls the transmission high frequency switch 110 to transmit the transmission high frequency BPF1.
07a and the transmission wave relay antenna 111 are switched to the connected state (step 527). Then, the transmission high frequency unit power supply control circuit 140, the reception high frequency unit power supply control circuit 141, the transmission IF unit power supply control circuit 142, and the reception IF unit power supply control circuit 143 are controlled to supply power to the transmission high frequency unit power supply control circuit 140. The power supply other than the above is stopped (step 530). As a result, the high frequency variable gain amplifier 108 and the power module 106 are operated by being supplied with power, and the transmission high frequency switch 110 conducts the transmission signal line from the transmission wave relay antenna 111 to the transmission / reception antenna 101, so that the transmission wave is relayed. Will be able to.

This communication is continued until it is determined in step 535 that the transmission is to be terminated, and when it is determined to be terminated, the processing returns to step 500.

In the first processing on the reception control processing side, that is, the processing of step 550, the control unit 125 determines whether or not to start reception by normal communication. If it is determined not to start, the process proceeds to step 570.

If it is determined to start, the controller 125 controls the reception high frequency switch 154 to switch the variable gain low noise amplifier 153 and the reception wave relay antenna 155 to the connected state (step 553). Then, the reception high frequency section power supply control circuit 140, the reception high frequency section power supply control circuit 141, the transmission IF section power supply control circuit 142,
The reception IF section power supply control circuit 143 is controlled, and the reception high frequency section power supply control circuit 141 and the reception IF section power supply control circuit 14 are controlled.
3 is supplied with power, and the other power supplies are stopped (step 555). As a result, the demodulation unit 150, the reception mixer 156, the variable gain low noise amplifier 15
3. The low noise amplifier 151 operates by being supplied with power, and the reception high frequency switch 154 conducts the reception signal line from the transmission / reception antenna 101 to the control unit 125, so that reception in normal communication can be performed.

This communication is continued until it is determined in step 560 that the reception is to be ended, and when it is determined that the reception is to be ended, the process proceeds to step 570.

In the process of step 570, the control section 125 determines whether or not to start the relay of the normal received wave. If it is determined not to start, the process returns to step 500.

If it is determined to start, the control unit 125 controls the reception high frequency switch 154 to switch the variable gain low noise amplifier 153 and the reception wave relay antenna 155 to the connected state (step 573). Then, the transmission high frequency section power supply control circuit 140, the reception high frequency section power supply control circuit 141, the transmission IF section power supply control circuit 142,
The reception IF unit power supply control circuit 143 is controlled so that the reception high frequency unit power supply control circuit 141 is supplied with power, and the other power supply is stopped (step 575). As a result, the variable-gain low-noise amplifier 153 and the low-noise amplifier 151 operate by receiving power supply, and the reception high-frequency switch 110 makes the reception signal line from the reception wave relay antenna 155 to the transmission / reception antenna 101 conductive, so that the reception wave You will be able to relay.

This communication is continued until it is determined in step 580 that the reception is to be terminated, and when it is determined that the reception is to be terminated, the process returns to step 500.

In this way, when performing transmission, reception, transmission wave relay, and reception wave relay in normal communication, power is supplied only to the necessary parts. Then, when the transmission wave relay and the reception wave relay are performed, power is not supplied to the modulation unit 120, the transmission mixer 121, the demodulation unit 150, and the reception mixer 156. Few.

When radio transmission to the base station is performed by the above operation, the control unit 125 controls the transmission high frequency switch 110 so that the transmission / reception antenna 101 can be used from the modulation unit 120. Wireless transmission becomes possible. When performing radio reception from the base station, the control unit 125 controls the reception high frequency switch 154 so that the demodulation unit 150 causes the transmission / reception antenna 1 to operate.
By making 01 available, wireless reception is possible. Further, when relaying wireless transmission from another wireless communication terminal to the base station, the control unit 125 controls the transmission high frequency switch 110 so that the transmission wave relay antenna 111 to the transmission / reception antenna 101 can be used for relay. By this, the signal received for relay is transmitted without being modulated or demodulated. Further, when relaying wireless transmission from the base station to another wireless communication terminal, the control unit 125 controls the reception high frequency switch 154 so that the reception wave relay antenna 155 to the transmission / reception antenna 101 can be used for relay. By this, the signal received for relay is transmitted without being modulated or demodulated. Therefore, in a wireless communication terminal that communicates with the base station at one time and relays communication between the base station and another wireless communication terminal at another time, a signal transmitted at the time of relay is subjected to demodulation and modulation processing. It seems that it has not been applied.

(Second Embodiment) In the radio communication terminal 10 shown in the first embodiment, when performing relay, between the transmission / reception antenna 101 and the transmission wave relay antenna 111 and between the reception wave relay antenna 155 and the transmission / reception antenna 101. The isolation between the antennas may be deteriorated depending on the installation state of these antennas and changes in the surrounding environment, such as metal entering the space between the antennas. If such isolation deterioration occurs, the power module 106 and the transmission high frequency BP are more likely than the isolation between the antennas.
F107b and a part of the high frequency variable gain amplifier 108 that performs transmission amplification, or a low noise amplifier 151,
When the gain of the receiving high frequency BPF 152 and the part of the variable gain type low noise amplifier 153 which performs the receiving amplification becomes high, the signal sent by itself is received and amplified,
The relay device may oscillate. In the present embodiment, in order to avoid this oscillation, the high frequency variable gain amplifier 108
Also, the gain adjustment of the variable gain type low noise amplifier 153 is performed.

FIG. 6 is a block diagram showing the configuration of the radio communication terminal 20 according to the second embodiment of the present invention. Regarding the portion of this wireless communication terminal 20 that has the same configuration as the wireless communication terminal 10 of the first embodiment,
The same reference numerals as those given in FIG. 1 are given and their explanations are omitted.

This wireless communication terminal 20 is the wireless communication terminal 1
0 component, terminating switch 610, terminator 62
0, a distributor 630, a reception high frequency switch 640, a transmission power control circuit 650, and a transmission power control circuit 660.

The terminal switch 610 is a switch having three terminals. The terminator 620 is connected to one terminal, the isolator 103 is connected to another terminal, and the duplexer 102 is connected to the other terminal.
Are connected. The termination switch 610 switches between a state in which the isolator 103 and the terminator 620 are connected and a state in which the isolator 103 and the duplexer 102 are connected by switching the connection state between these terminals. Has become. Further, the terminal switch 610 receives a control signal from the control unit 125, and switches between the states described above based on this control signal.

The distributor 630 is the reception wave relay antenna 1
High-frequency switch 1 for distributing and receiving signals received from 55
54 and the reception high frequency switch 640.

The reception high frequency switch 640 is a switch having three terminals. One terminal of the reception high-frequency switch 154 is connected to one terminal, the reception mixer 156 is connected to another terminal, and the distributor 630 is connected to the other terminal. In the reception high frequency switch 640, the state in which the reception mixer 156 and the reception high frequency switch 154 are connected and the state in which the reception mixer 156 and the distributor 630 are connected by switching the connection state between these terminals. It is designed to switch between and. In addition, the reception high frequency switch 64
0 receives a control signal from the control unit 125 and switches between the above states based on this control signal.

Further, due to the presence of the distributor 630 and the reception high frequency switch 640, the reception high frequency switch 154 is provided.
Connected to these three terminals are the variable gain low noise amplifier 153, the reception high frequency switch 640, and the distributor 630.

The transmission power control circuit 650 has a control section 125.
Receiving a control signal from the high frequency variable gain amplifier 10
8 is a circuit for adjusting the gain of amplification of 8.

The transmission power control circuit 660 includes a control unit 125.
It is a circuit that receives a control signal from the control unit and adjusts the gain of amplification of the variable gain low noise amplifier 153.

In the wireless communication terminal 20 configured as described above, when relaying a transmission wave from another wireless terminal to the base station, the control unit 125 controls the termination switch 610 immediately before starting the relay. Isolator 103 and terminator 6
20 is switched to the connected state, and the signal received by the transmission wave relay antenna 111 is stopped by the terminator 620. At this time, the detector 105 notifies the received signal level to the control unit 125, and the control unit 125 detects the signal level of the directional coupler 104 based on this notification, thereby monitoring the average transmission power of the relay. To do.

Next, the control unit 125 causes the termination switch 610 to operate.
Is controlled to switch to a state in which the isolator 103 and the duplexer 102 are connected and start relaying. At this time, if the transmission power monitored by the modulation unit 120 based on the signal from the detector 105 suddenly becomes larger than the average transmission power described above in a short time, the control unit 125 determines that oscillation is likely to occur. Then, the transmission power control circuit 650 is controlled to adjust the amplification gain of the high frequency variable gain amplifier 108 to be low, and the oscillation is suppressed.

When relaying a transmission wave from a base station to another wireless terminal, the control unit 1 is used when relaying is started.
25 controls the reception high frequency switch 154 to switch to a state in which the variable gain low noise amplifier 153 and the distributor 630 are connected, and the reception high frequency switch 64
0 is controlled to switch the reception mixer 156 and the distributor 630 to the connected state. By doing so, the received wave received from the received wave relay antenna 155 is distributed by the distributor 630, one of the distributed waves is output from the transmission / reception antenna 101, and the other is distributed to the demodulation unit 150 and the baseband signal processing unit. The signal is received by the control unit 125 via 130, and the control unit 125 monitors the power level of the received signal. When the monitored power level rises rapidly in a short time, the control unit 125 determines that the possibility of oscillation is high,
The transmission power control circuit 660 is controlled to adjust the gain of the variable gain low noise amplifier 153 to be low,
Suppress oscillation.

When transmitting to the base station in normal communication, the control unit 125 controls the switch transmission high frequency switch 110 to switch the transmission high frequency BPF 107a and the transmission mixer 121 to the connected state.
Further, the control unit 125 controls the terminal switch 610 to switch the isolator 103 and the duplexer 102 to the connected state. By doing so, the control unit 1
25 and the signal generated by the baseband signal processing unit 130 is modulated by the modulation unit 120, and the transmission / reception antenna 101
Will be sent from.

When receiving from a base station in normal communication, the control unit 125 controls the reception high frequency switch 154 and the reception high frequency switch 640 and the variable gain type low noise amplifier 153 are connected. Switch to. Further, the control unit 125 uses the reception high frequency switch 6
40, and switches to a state in which the reception mixer 156 and the reception high frequency switch 154 are connected. By doing so, the signal received by the transmission / reception antenna 101 is demodulated by the demodulation unit 150, and the baseband signal processing unit 1
The data is received and processed by the control unit 125 via 30.

When radio transmission to the base station is performed by the above operation, the control unit 125 controls the transmission high frequency switch 110 and the termination switch 610 so that the transmission / reception antenna 101 can be used from the modulation unit 120. By doing so, wireless transmission becomes possible. Further, when performing wireless reception from the base station, the control unit 125 causes the transmission / reception high frequency switch 640 and the reception high frequency switch 15 to operate.
By controlling 4 to enable the transmission / reception antenna 101 to be used from the demodulation unit 150, wireless reception can be performed. Further, when relaying wireless transmission from another wireless communication terminal to the base station, the control unit 125 controls the transmission high frequency switch 110 and the terminal switch 610 so that the transmission wave relay antenna 111 to the transmission / reception antenna 101 relay. By making it available to
The signal received for relay is transmitted without being modulated or demodulated. When relaying wireless transmission from the base station to another wireless communication terminal, the control unit 125 controls the reception high frequency switch 640 and the reception high frequency switch 154 so that the reception wave relay antenna 155 to the transmission / reception antenna 101 are connected. By making it usable for relaying, the signal received for relaying is transmitted without being modulated or demodulated. Therefore, in a wireless communication terminal that communicates with the base station at one time and relays communication between the base station and another wireless communication terminal at another time, a signal transmitted at the time of relay is subjected to demodulation and modulation processing. It seems that it has not been applied.

(Third Embodiment) Since the radio communication terminals 10 and 20 shown in the first and second embodiments do not particularly perform processing of selecting a communication frequency when performing relay, use of the communication system All the frequency components of the frequency band will be relayed at the same time. However, in the case of a communication system in which communication channels are distinguished by frequency, there is a possibility that even communication on channels that do not need to be relayed will be relayed. In this embodiment, the signal to be relayed is once
Is down-converted to, then signals other than unnecessary frequency band communication are removed by a filter, and signals from this unnecessary band signal are up-converted to RF. By doing so, it becomes possible to relay only the specific frequency to be relayed.

FIG. 7 is a block diagram showing the configuration of the radio communication terminal 30 according to the third embodiment of the present invention. Regarding the portion of this wireless communication terminal 30 that has the same configuration as the wireless communication terminal 20 of the second embodiment,
The same reference numerals as those given in FIG. 6 are given and their explanations are omitted.

This wireless communication terminal 30 is the same as the wireless communication terminal 2
In addition to the components of 0, a transmission RF band BPF 710, a relay low noise amplifier 720, a transmission down converter mixer 730, a relay reception amplifier 760, a reception high frequency BPF7.
80a and a reception high frequency BPF 780b.

The structure of the wireless communication terminal 30 is different from that of the wireless communication terminal 20 in the following four points.

The first point is that between the distributor 630 and the reception wave relay antenna 155, the reception up-converter mixer 770 and the reception high frequency BPF 7 are arranged in this order from the distributor 630 side.
80a, relay reception amplifier 760, reception high frequency BPF7
80b is interposed. The second point is that the reception IF band BPF 157 and the reception mixer 156, which were on the output side of the reception high frequency switch 640 in the wireless communication terminal 20, are provided between the reception high frequency switch 154 and the variable gain type low noise amplifier 153 in the wireless communication terminal 30. There is.
The third point is that the transmission down-converter mixer 730, the relay low-noise amplifier 720, and the transmission RF band BPF 710 are interposed between the transmission high-frequency switch 110 and the transmission wave relay antenna 111 in this order from the transmission high-frequency switch 110 side. . The fourth point is that in the wireless communication terminal 20, the transmission mixer 121 and the transmission I, which were on the output side of the modulator 120, were used.
The F band BPF 122 is between the transmission high frequency switch 110 and the transmission high frequency BPF 107a in the wireless communication terminal 30.

The transmission RF band BPF 710 is a bandpass filter that removes unnecessary frequency components from the signal received from the transmission wave relay antenna 111 and outputs the signals from which the unnecessary components are removed to the relay low noise amplifier 720. is there.

The relay low noise amplifier 720 is used for transmission R
It is an amplifier that amplifies the signal received from the F-band BPF 710 and outputs it to the transmission down converter mixer 730.

The transmission down converter mixer 730 multiplies the output of the transmission down converter mixer 730 and the local oscillation signal to generate an IF band signal, and outputs this signal to the transmission high frequency switch 110.

The reception up-converter mixer 770 multiplies the output of the distributor 630 and the local oscillation signal to generate an RF band signal, and receives this signal and receives high frequency BPF 780a.
Is output to.

The reception high frequency BPF 780a is a bandpass filter that removes unnecessary frequency components from the signal output from the reception up-converter mixer 770 and outputs the signal from which the unnecessary components are removed to the relay reception amplifier 760.

The relay reception amplifier 760 is an amplifier that amplifies the signal output from the transmission / reception high frequency BPF 780a and outputs the amplified signal to the reception high frequency BPF 780b.

The reception high frequency BPF 780b is a bandpass filter for removing an unnecessary frequency component from the signal output from the relay reception amplifier 760 and outputting the signal from which the unnecessary component is removed to the reception wave relay antenna 155. .

In this embodiment, the transmission IF band B
The PF 122 and the reception IF band BPF 157 are narrow band pass filters that cut off signals other than a specific frequency band to be relayed.

In the wireless communication terminal 30 having the above-described structure, when the control section 125 performs the operation as shown in the second embodiment to perform wireless transmission to the base station,
The control unit 125 controls the transmission high-frequency switch 110 and the terminating switch 610 so that the modulation unit 120 can use the transmission / reception antenna 101, thereby enabling wireless transmission. When performing wireless reception from the base station, the control unit 125 controls the transmission / reception high-frequency switch 640 and the reception high-frequency switch 154 so that the demodulation unit 150 can use the transmission / reception antenna 101 to perform wireless reception. . Also,
When relaying wireless transmission from another wireless communication terminal to the base station, the control unit 125 controls the transmitting high frequency switch 110 and the terminating switch 610 so that the transmitting wave relay antenna 111 to the transmitting / receiving antenna 101 are used for relaying. By making it possible, the signal received for relay is transmitted without being modulated or demodulated.
Further, when relaying wireless transmission from the base station to another wireless communication terminal, the control unit 125 causes the reception high frequency switch 64.
0 and the reception high frequency switch 154 are controlled so that the reception wave relay antenna 155 to the transmission / reception antenna 101 can be used for relay, so that the signal received for relay is modulated and demodulated. Sent without. Therefore, in a wireless communication terminal that communicates with the base station at one time and relays communication between the base station and another wireless communication terminal at another time, a signal transmitted at the time of relay is subjected to demodulation and modulation processing. It seems that it has not been applied.

In this relay, the transmission IF band BPF
Since 122 and the reception IF band BPF 157 pass only the signal in the specific frequency band, it becomes possible to relay only the specific frequency to be relayed.

In the first to third embodiments of the present specification, the transmitting / receiving antenna 101 constitutes the first antenna. However, the first antenna does not have to be composed of one antenna as in these embodiments, and may be composed of, for example, two antennas such as a transmitting antenna and a receiving antenna.

Further, in the first to third embodiments, the transmission wave relay antenna 111 constitutes a second antenna.

Also, in the first to third embodiments, the received wave relay antenna 155 constitutes a third antenna.

In the first to third embodiments, the modulator 120 constitutes a modulator that modulates the received baseband signal and outputs it for wireless transmission.

In the first to third embodiments, the high frequency variable gain amplifier 108, the transmission high frequency BPF 107b,
And the power module 106 constitutes a transmission amplification section which is on the output side of the modulation section, amplifies the received signal, and outputs the amplified signal to the first antenna for wireless transmission.

In the first to third embodiments, the demodulation section 150 is on the output side of the reception amplification section and constitutes a demodulation section for demodulating the received signal and outputting the baseband signal.

Further, in the first to third embodiments, the low noise amplifier 151, the reception high frequency BPF 152 and the variable gain type low noise amplifier 153 constitute a reception amplification section for amplifying and outputting the signal received from the first antenna. .

Further, when the processing shown in FIG. 5 performed by the control unit 125 performs wireless transmission to the base station, the modulation unit, the transmission amplification unit and the first antenna can be used, and the wireless reception from the base station is performed. When the radio communication is performed, the demodulation unit, the reception amplification unit, and the first antenna can be used, and when the radio transmission from another radio communication terminal to the base station is relayed, the second antenna, the transmission amplification unit, and the first antenna are used. The transmitting / receiving / relaying means that enables the third antenna, the reception amplification section, and the first antenna to be used when relaying the wireless transmission from the base station to another wireless communication terminal. Constitute. However, the control unit 125 is
Unlike the third embodiment, when switching between normal communication and relay, it is not necessary to control the power supplied to each unit of the wireless communication terminal 10, the wireless communication terminal 20, and the wireless communication terminal 30.

Further, in the third embodiment, the transmission IF band BPF 122 is located between the second antenna and the transmission amplification section and is a first narrow band pass filter for cutting off signals other than the frequency band of a specific channel. Make up.

Further, in the third embodiment, the reception IF band BPF 157 is located between the third antenna and the reception amplification section and is a second narrow band pass filter for cutting off signals other than the frequency band of the specific channel. Make up.

[Brief description of drawings]

FIG. 1 is a wireless communication terminal 10 according to a first embodiment of the present invention.
3 is a block diagram showing the configuration of FIG.

FIG. 2 is a schematic diagram of a state in which the wireless communication terminal 10 is mounted on a vehicle.

FIG. 3 is a timing chart of communication of the wireless communication terminal 10.

FIG. 4 is a flowchart showing a process in which the control unit 125 of the wireless communication terminal 10 determines a relay timing.

FIG. 5 is a flowchart showing a control process of a switch and a power supply control circuit performed by a control unit 125.

FIG. 6 is a block diagram showing a configuration of a wireless communication terminal 20 according to a second embodiment.

FIG. 7 is a block diagram showing a configuration of a wireless communication terminal 30 according to a third embodiment.

FIG. 8 is a block diagram showing a configuration of a conventional wireless communication terminal 100.

[Explanation of Codes] 10, 20, 30, 100 ... Radio Communication Terminal, 101 ... Transmitting / Receiving Antenna, 102 ... Duplexer, 103 ... Isolator, 104 ... Directional Coupler, 105 ... Detector 10
5, 106 ... Power module, 107a ... Transmission high frequency BPF, 107b ... Transmission high frequency BPF, 108 ... High frequency variable gain amplifier, 110 ... Transmission high frequency switch, 11
1 ... Transmission wave relay antenna, 120 ... Modulation section, 121 ...
Transmission mixer, 125 ... Control unit, 130 ... Baseband signal processing unit, 140 ... Transmission high frequency unit power supply control circuit, 141
... reception high frequency section power supply control circuit, 142 ... transmission IF section power supply control circuit, 143 ... reception IF section power supply control circuit, 150 ...
Demodulator, 151 ... Low noise amplifier, 152 ... Reception high frequency BPF, 153 ... Variable gain type low noise amplifier, 1
54 ... Reception high frequency switch, 155 ... Reception wave relay antenna, 156 ... Reception mixer, 157 ... Reception IF band BP
F, 210 ... Radio transmitter power control circuit, 220 ... Radio receiver power control circuit, 610 ... Transmission high frequency switch, 62
0 ... Terminator, 630 ... Distributor, 640 ... Reception high frequency switch, 650 ... Transmission power control circuit, 660 ... Transmission power control circuit, 710 ... Transmission RF band BPF, 720 ... Low noise amplifier for relay, 730 ... Transmission down converter mixer , 760 ... Relay receiving amplifier, 770 ... Reception up-converter mixer, 780a ... Reception high frequency BPF, 780
b ... Receiving high frequency BPF.

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5K011 BA04 DA12 DA23 DA27 EA03                       JA01                 5K067 AA42 BB04 BB21 EE02 EE06                       EE10 EE25 KK03                 5K072 AA18 BB13 CC33 GG01 GG11                       GG12 GG13 GG22

Claims (4)

[Claims] 1. A wireless communication terminal that exchanges radio waves with a base station and another wireless communication terminal, the first antenna and a modulator that modulates a received baseband signal and outputs it for wireless transmission. A transmission amplification section that is on the output side of the modulation section, amplifies the received signal, and outputs the amplified signal to the first antenna for wireless transmission, and a signal received from the first antenna A reception amplification section that amplifies and outputs, a demodulation section that is on the output side of the reception amplification section, that demodulates the received signal and outputs a baseband signal, and that is on the input side of the transmission amplification section, and A second antenna that is not on the input side of the modulation section, a third antenna that is on the output side of the reception amplification section and that is not on the output side of the demodulation section, and when performing radio transmission to a base station, the modulation section , The transmission amplification section, in front The first antenna is to be used,
When performing radio reception from the base station, the demodulator,
When enabling the reception amplification section and the first antenna and relaying wireless transmission from another wireless communication terminal to the base station, the second antenna, the transmission amplification section, and the first antenna When the wireless transmission from the base station to another wireless communication terminal is relayed, the third antenna, the reception amplification unit, and the first amplification unit are used.
A wireless communication terminal comprising: a transmitting / receiving / relaying unit that enables the use of the antenna. 2. The transmitting / receiving / relaying unit is configured to connect the transmission amplification unit to the output side of the modulation unit when performing wireless transmission to a base station, and to perform wireless reception from the base station when performing wireless reception. The second amplifying unit is connected to the input side of the transmitting amplifying unit when the receiving amplifying unit is connected to the input side of the demodulating unit and when the wireless transmission from another wireless communication terminal to the base station is relayed. In addition, the modulation unit is blocked from the transmission amplification unit, and when relaying wireless transmission from the base station to another wireless communication terminal, the third antenna is provided on the output side of the reception amplification unit. The wireless communication terminal according to claim 1, wherein the wireless communication terminal is connected and the demodulation unit is disconnected from the reception amplification unit. 3. The transmitting / receiving / relaying unit supplies power to the modulation unit when performing wireless transmission to a base station, and supplies power to the demodulation unit when performing wireless reception from the base station. In addition, when relaying wireless transmission from another wireless communication terminal to the base station, power is not supplied to the modulation unit, and wireless transmission from the base station to another wireless communication terminal is performed. When relaying,
The wireless communication terminal according to claim 1 or 2, wherein power is not supplied to the demodulation unit. 4. A first narrow band pass filter, which is located between the second antenna and the transmission amplification section and blocks signals other than a frequency band of a specific channel, the third antenna and the reception. 4. A second narrow band pass filter, which is located between the amplification unit and blocks a signal other than the frequency band of a specific channel, and a second narrow band pass filter. Wireless communication terminal.