JPH0724387B2 - Wireless signal relay method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A radio signal relay to be carried out in each of the relay stations so as to wirelessly transmit a predetermined signal from a source station to a plurality of relay stations in order to wirelessly transmit to a receiving station. Regarding a method and an apparatus for implementing the method, a predetermined signal is transmitted from a transmitting station to a plurality of relay stations for the purpose of eliminating the influence of radio waves coming from the receiving side at the relay station and widening the service area. A wireless signal relay method implemented in each of the relay stations for wireless transmission to the receiving station by sequentially regenerating and relaying the received signal after waiting for the reception of the predetermined signal. A first step of determining whether or not, and a second step of transmitting the predetermined signal for a predetermined transmission time when the predetermined signal is received
And a third step of returning to the first step after a pause for a predetermined rest time required for eliminating the sneak of the transmission signal from the relay station on the receiving station side after the end of the transmission. Or a signal generation unit that generates a modulation signal that generates the predetermined signal, a reception unit that identifies and receives a predetermined signal among the signals wirelessly transmitted, A transmitting unit that wirelessly transmits the modulated signal and the receiving unit are operated, and when the predetermined signal is received, the transmitting unit is controlled to transmit the predetermined signal for a predetermined transmission time, After the end of the transmission, the reception unit and the transmission unit are suspended for a predetermined pause time required for eliminating the sneak of the transmission signal from the relay station on the reception station side, and after the pause time, the operation of the reception unit Sending and receiving control to restart And a control unit.

[Industrial application field]

The present invention relates to a wireless signal relaying method and apparatus, and more particularly to a wireless signal relaying method for wirelessly transmitting a predetermined signal from a transmitting station to a receiving station by sequentially regenerating and relaying the signal to a receiving station. The present invention relates to a signal relay method and an apparatus for implementing the method.

When trying to wirelessly transmit a predetermined signal such as an alarm signal from a transmitting station to a receiving station, for example, in a place where radio wave propagation is poor such as in a mountainous area, the predetermined signal is transmitted by a plurality of relay stations. It is necessary to transmit by sequentially reproducing and relaying.

FIG. 5 shows that a plurality of relay stations 7-1, 7-2, and 7-3 sequentially reproduce and relay the relay stations 7-1, 7-2, and 7-3 in this manner to transmit from the transmission station 6 to the reception station 8.
1 shows an arrangement example of each station when a predetermined signal is to be wirelessly transmitted to -1,8-2. In such receiving stations 7-1, 7-2, 7-3, when the above predetermined signal is received from the transmission station 6 or the relay station on the transmission station side, the predetermined signal is generated by itself for a predetermined transmission time. Then, the data is transmitted to the relay station on the receiving station side, and after the transmission time elapses, the transmitting station 6
Alternatively, it is repeated whether or not the predetermined signal is transmitted from the receiving station on the transmitting station side, and when the predetermined signal is received, the transmission of the predetermined signal for the transmission time is repeated. However, in this case, at the time of reception (for example, at the relay station 7-2), even after the transmission of the predetermined signal from the transmission station 6 or the relay station 7-1 on the transmission station side is completed, the reception station is further received. There is a problem that the end of the transmission cannot be recognized on the transmitting station side because the signal transmitted from the relay station 7-3 on the other side wraps around with a slight delay, and the wireless line is used for transmitting the above signal. It was preventing me from doing it. Therefore, there has been a demand for a technique for eliminating the above-mentioned wraparound.

[Prior art and problems to be solved by the invention]

Conventionally, when transmitting a predetermined signal such as an alarm signal from a transmitting station to a receiving station by sequentially regenerating and relaying it at a plurality of relay stations, when the relay station receives the signal, the transmitting station or the transmitting station side relay station Even after the transmission of the predetermined signal from the terminal is finished, the signal transmitted from the relay station on the receiving station side with a slight delay wraps around to prevent the end of the transmission on the transmitting station side from becoming unrecognizable. For,
A configuration has been used in which a leaky coaxial cable that doubles as a radio wave transmission line and a radiator is laid, and a plurality of relay amplifiers are provided on the way to compensate for the attenuation in the leaky coaxial cable. However, even in such a conventional configuration, in each of the above-mentioned relay amplifiers, since the radio wave from the output side wraps around to the input side, there is a problem that oscillation occurs when the gain of the relay amplifier is increased. Since the gain of the repeater amplifier cannot be increased so much, there is a problem that it is necessary to provide a large number of repeater amplifiers. Further, in the transmission by laying the leaky coaxial cable, there is a problem that the service area is limited to the linear service area along the leaky coaxial cable.

The present invention has been made in view of the above problems, and when a predetermined signal is transmitted from a transmitting station to a receiving station by a plurality of relay stations in sequence by regenerating and relaying the signals, the relay station receives the signals. It is an object of the present invention to provide a wireless signal relay method and apparatus that eliminates the influence of radio waves coming from the side and has a wide service area.

[Means for Solving the Problems]

FIG. 1 shows a receiving station 8-1 in which a predetermined signal is sequentially regenerated and relayed from a transmitting station 6 to a plurality of relay stations 7-1, 7-2, 7-3 in the first embodiment of the present invention. FIG. 8 is a basic configuration diagram of a wireless signal relay method implemented in each of the relay stations 7-1, 7-2, 7-3 for wireless transmission to the wireless terminals 8 and 8-2. In the figure, S1 and S2 are the first steps of waiting for the reception of the predetermined signal and determining whether or not the predetermined signal has been received, and S3 shows that the predetermined signal has been received. When a predetermined transmission time, a second step of transmitting the predetermined signal, and S4
Is a predetermined pause time required for eliminating the sneak of the transmission signal from the relay station on the receiving station side after the end of the transmission,
It is a third step of returning to the first steps S1 and S2 after the suspension.

Further, FIG. 2 shows that in the second embodiment of the present invention, the receiving station 8 is provided by sequentially reproducing and relaying a predetermined signal from the transmitting station 4 at the plurality of relay stations 7-1, 7-2, 7-3. 1 shows a basic configuration of a radio signal relay device implemented in each of the relay stations 7-1, 7-2, 7-3 for wireless transmission to -1, 8-2. In FIG. 2, 1 is a receiver, 2 is a transmission / reception controller, 3 is a transmitter, and 4 is a signal generator.

The receiving unit 1 identifies and receives a predetermined signal among the signals wirelessly transmitted. The signal generator 4 generates a modulation signal that generates the predetermined signal. The transmitter 3 wirelessly transmits the signal modulated by the modulated signal. Then, the transmission / reception control unit 2 operates the reception unit 1 and, when the predetermined signal is received, controls the transmission unit 3 to transmit the predetermined signal for a predetermined transmission time, After the end of the transmission, the reception unit 1 and the transmission unit 3 are suspended for a predetermined pause time required to prevent the transmission signal from the relay station on the reception station side from wrapping around, and after the pause time, the reception unit The control of 1 is restarted.

[Work]

In the first aspect of the present invention, each relay station is configured to operate in the second
After the end of the transmission in step S3, in the third step S4, after pausing for a predetermined pause time required for eliminating the sneak of the transmission signal from the relay station on the receiving station side, in the first step, After waiting for the reception of the predetermined signal, it is determined whether or not the predetermined signal is received. Therefore, according to the first aspect of the present invention, while waiting for reception of the predetermined signal, even if the transmission of the predetermined signal is completed in the relay station or the transmission station on the side of the transmission station, the reception of the predetermined signal is further improved. The end of the transmission cannot be recognized due to the sneak of the transmission signal from the relay station on the station side.

And in the 2nd form of this invention, the receiving part 1 is
The transmission of the predetermined signal in the first steps S1 and S2 in the first embodiment of the present invention described above is performed, and the transmitter 3 and the signal generator 4 similarly perform the predetermined transmission time of the second step S3. The predetermined signal is transmitted, and the transmission / reception control unit 2 sequence-controls the operation timing of each of the reception unit 1, the signal generation unit 4, and the transmission unit 3 to obtain the above-described first aspect of the present invention. The wireless signal relay method of the embodiment is carried out.

〔Example〕

FIG. 3 shows a configuration of an embodiment of a radio signal relay apparatus according to the second mode of the present invention. In FIG.
The configurations within the dashed-dotted lines 1 and 2 correspond to the receiving unit 1 and the transmission / reception control unit 2 in FIG. 2, respectively. The transmitter 31 of FIG. 3 corresponds to the transmitter 3 of FIG. 2, and the signal generator 41 of FIG. 3 corresponds to the signal generator 4 of FIG. That is, the signal generator 41 generates a predetermined modulated signal, and the transmitter
Reference numeral 31 wirelessly transmits a signal modulated by the modulation signal, that is, the predetermined signal. And these transmitters 31
The signal generator 41 and the signal generator 41 both operate by receiving an effective output from the transmission / reception control unit 2 as described later. In FIG. 3, reference numeral 5 is a transmitting / receiving antenna connected to each of the receiving unit 1 and the transmitter 31.

First, in the chain line 1, 11 is a receiver, 12 is a signal detector, and 13 is a squelch gate. The receiver 11 receives a radio wave having a target carrier frequency via the antenna 5 and demodulates it into a modulated signal, and the line signal detector 12 is the receiver.
The modulation signal demodulated in 11 is detected and the output is validated only when it is a signal of its own system, and the squelch gate 13 is a radio wave of the carrier frequency received in the receiver 11. A radio wave having a predetermined intensity level or less is regarded as noise, and the output is validated only when a current having a predetermined intensity level or more is detected. In the configuration example of FIG. 3, the receiver 11 is normally in the operating state, but as described later, it receives the stop control from the transmission / reception control unit 2 to stop the receiving operation.

Next, within the chain line 2, 21 and 23 are AND circuits, 22 is a transmission timer, 24 is a counter, and 25 is a sleep timer. AND
The circuit 21 includes the signal detector 12 and the squelch gate 13
And the inverted output of the sleep timer 25, which will be described later, are input, and the output is applied to the transmission timer 22. The logical product of the output of the signal detector 12 and the output of the squelch gate 13 is for avoiding malfunction due to interference or the like and for improving the reliability of the signal. The output of the transmission timer 22 rises in response to the rise of the output of the AND circuit 21, and falls after measuring a predetermined transmission time. The output of the transmission timer 22 is applied to one input terminal of the AND circuit 23 and the input terminal of the counter 24. The counter 24 counts the number of falling edges of the output of the transmission timer 22. Then, when the transmission is counted a predetermined number of times (in this example, twice as described later in FIG. 4), the output applied to the pause timer 25 is validated and the pause timer 25 is activated. . The pause timer 25 counts a predetermined pause time, which is a feature of the present invention, and enables its output for a predetermined pause time after the rising of the output of the counter 24. The inverted output of the pause timer 25 is applied to one of the input terminals of the AND circuit 21 as described above, and is also applied to the other input terminal of the AND circuit 23. The output of the AND circuit 23 becomes the output of the transmission / reception control unit 2. That is, when the output of the pause timer 25 is not valid, the outputs of the signal detector 12 and the squelch gate 13 of the receiver 1 are both valid (that is,
When a predetermined signal is being received), the output of the AND circuit 21 rises, the transmission timer 22 is activated, and the output of the transmission timer 22 becomes valid for a predetermined transmission time. At this time, the count of the counter 24 is incremented according to the fall of the output of the transmission timer 22, but if the count still does not reach the predetermined number of times, the output of the pause timer 25 is Since it is not valid, the output of the AND circuit 23 is valid while the output of the transmission timer 22 is valid, so that the receiver 11 is stopped and the transmitter 31
The signal generator 41 is activated and a predetermined signal is transmitted from the antenna 5 during the predetermined transmission time. If the count of the counter 24 reaches the predetermined number due to the fall of the transmission timer 22, the pause timer 25
Is activated and a signal obtained by inverting the valid output of the pause timer 25 is applied to the other input terminal of the AND circuit 23, the output of the transmission / reception control unit 2 is not valid, and the transmitter 31 Does not output the predetermined signal. Further, thereafter, until the output of the pause timer 25 falls after the predetermined pause time elapses, the output of the AND circuit 21 is not valid, and the reception signal of the predetermined signal in the receiving unit 1 is not transmitted by the transmission timer. Not transmitted to 25.

FIG. 4 shows the above-mentioned arrangement of FIG.
3 shows timings when the wireless signal relay apparatus having the configuration of FIG. 3 described above is used in 1, 7-2, and 7-3.

First, the transmitting station 6 starts transmitting a predetermined signal,
When the level that can be received by the relay station 7-1 is reached at time t ₁ , the transmission of the predetermined signal is also performed in the relay station 7-1 by the operation of the circuit configuration described above (see FIG. 3). It starts, but due to the delay T _{D at} relay station 7-1,
This signal is time t ₂ reach a level which can be received in the relay station 7-2. Thus, also the transmitted start of the predetermined signal in the same manner in the relay station 7-2, the signal at time t ₃ after a further delay time T _D from the time t ₂ is also received by the relay station 7-3 Reach the level you earn. Then, for example, after the predetermined signal is received by the relay station 7-1 at the time t ₁ , the transmission time of the transmission timer 22 in FIG. 3 is valid, that is, during the predetermined transmission time T _TR , the relay station 7-1. 7
The transmission of the predetermined signal from -1 (indicated by TR in FIG. 4) continues.

After the transmission time T _TR has elapsed, the relay station 7-1 shifts to the receivable state (indicated by RC in FIG. 4). At this time, the transmitting station 6 is still transmitting the predetermined signal, so at time t _{4, the} relay station 7-1 receives the predetermined signal again to start transmitting the predetermined signal. The signal is received at the relay station 7-2 at time t ₅ after the delay time T _D , and at the relay station 7-3 at time t ₆ after the delay of T _{D at} the relay station 7-2. It

After the transmission of the predetermined transmission time T _TR continues again, the relay station 7
In -1, since the transmission is counted twice, the pause timer 25 of FIG. 3 is started from time t ₇ , and the relay station 7-1 pauses both transmission and reception for a predetermined pause time T _I. To do. When the pause time T _I of the relay station 7-1 ends at the time t ₈ , the transmitting station 6 is still continuing to transmit the predetermined signal, and the relay station 7-1 receives this, Further, the transmission of the predetermined transmission time T _TR is started. Also in the relay station 7-2 and 7-3, respectively, performed the time T _D 2T _D
With a delay, the same operation as that of the relay station 7-1 is performed.

Next, at time t _{9, the} transmitting station 6 stops transmitting the predetermined signal. After that, in the relay station 7-1, the transmission time T _TR
, And the state becomes receivable at time t _10. At this time, although the transmitting station 6 has stopped transmitting, the relay station 7
−1, the predetermined signal transmitted from the relay station 7-2 or the relay station 7-3 operating with delay times of T _D and 2T _D , respectively, wraps around and is received by the relay station 7-1. Therefore, the relay station 7-1 also starts transmission of the predetermined transmission time T _TR , and the relay station 7-2 or the relay station 7-3 also starts transmission with delay times of T _D and 2T _D , respectively.

When the transmission time T _TR ends in the relay station 7-1, the transmission is counted twice, so that the relay station 7 stops both transmission and reception during the predetermined pause time T _I from time t _11. . And the relay station 7-2 and the relay station 7-3 are also
Each T _D and 2T _D The pause time with a delay time of T _I
Pause for a while. At this time, in the example of FIG. 4, T _I > 2T _D
If the above condition is satisfied, even if the relay station 7 becomes ready for reception at time t ₁₂ after the suspension, the relay station 7
Relay station 7 capable of transmitting a signal that can be received at -1
Since 2 and 7-3 are all in the dormant state, radio waves do not sneak in and the transmission is not started at the relay station 7-1. Therefore, the transmission is also started at the relay stations 7-2 and 7-3. Not done.

As described above, according to the configuration of FIG. 3, each relay station performs transmission and reception for the predetermined transmission time T _TR every predetermined number of times (twice) during the predetermined pause time T _I. Stop. This stop time is set so that all relay stations that can transmit a signal that can be received by the relay station are in the dormant state at the time when the relay station ends the rest time and becomes the receivable state again. That is, the delay time of the relay station that transmits the signal with the maximum delay time among all the relay stations that can transmit the signal that can be received to the relay station (2T _{D in} the example of FIG. 4). ) Need to be set larger.

In this way, when attempting to wirelessly transmit a predetermined signal from the transmitting station to the receiving station by a plurality of relay stations sequentially by reproducing and relaying, it eliminates the influence of the radio wave from the receiving side in the relay station, and Technology for expanding the service area is realized.

〔The invention's effect〕

According to the wireless signal relaying method or the wireless signal relaying device of the present invention, when a predetermined signal is transmitted from a transmitting station to a receiving station to a plurality of relay stations in sequence by reproducing and relaying, a relay is performed. In a station, it is possible to eliminate the influence of radio waves coming from the receiving side and to widen the service area.

[Explanation of symbols]

1 ... Reception unit, 2 ... Transmission / reception control unit, 3 ... Transmission unit, 4
...... Signal generator, 6 …… Sending station, 7-1,7-2,7-3 ……
Relay station, 8-1, 8-2 ... Reception station, 11 ... Receiver, 12 ...
… Signal detector, 13 …… Squelch gate, 21,23 …… AND
Circuit, 22 …… Transmission timer, 24 …… Counter, 25 …… Hibernation timer, 31 …… Transmitter, 41 …… Signal generator.

Claims (4)

[Claims] 1. A receiving station (8-1,8-) by sequentially regenerating and repeating a predetermined signal from a transmitting station (6) at a plurality of relay stations (7-1,7-2,7-3). 2) A wireless signal relaying method carried out in each of the relay stations (7-1, 7-2, 7-3) for wireless transmission to the relay station, waiting for reception of the predetermined signal, A first step (S1, S2) for determining whether a signal is received, and a second step (S3) for transmitting the predetermined signal for a predetermined transmission time when the predetermined signal is received. After the end of the transmission, a predetermined pause time required for eliminating the sneak of the transmission signal from the relay station on the receiving station side, and after a pause, return to the first step (S1, S2). A wireless signal relay method comprising the steps of: (S4). 2. A receiving section (1) for identifying and receiving a predetermined signal among signals transmitted by radio, a signal generating section (4) for generating a modulated signal for generating the predetermined signal, A transmitter (3) for wirelessly transmitting a signal modulated by a modulated signal and the receiver (1) are operated, and when the predetermined signal is received, the predetermined signal is transmitted for a predetermined transmission time. Control the transmitting unit (3) so that after the end of the transmission,
The receiver (1) and the transmitter (3) are suspended for a predetermined pause time required for eliminating the sneak of the transmission signal from the relay station on the receiver station side, and after the pause time, the receiver (1) (2) A transmission / reception control unit (2) for controlling the operation to be restarted. 3. The receiver (1) receives a radio wave of a target carrier frequency and demodulates it into a modulated signal, and identifies the signal of its own system from the demodulated signal. The radio according to claim 2, comprising a signal detector (12) for detecting, and a squelch gate (13) for detecting that the received radio wave of the target carrier frequency has a predetermined intensity or more. Signal relay device. 4. The transmission / reception control unit (2), a transmission timer (22) for measuring the transmission time, a pause timer (25) for measuring the pause time, the signal detector (12) and the squelch. A gate circuit (21) for activating the transmission timer (22) when both the output of the gate (13) is valid and the output is not in the idle time, and the valid output of the transmission timer (22) The radio signal relay apparatus according to claim 3, wherein the transmitting unit (3) is activated by the above and the receiving unit (1) is stopped.