JP3054296B2 - Multi-channel line connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an occupied line composed of N communication channels and control channels, connects a plurality of radio terminals via a radio relay device, and searches for an empty communication channel. A multi-channel line connection system in which arbitrary wireless terminal devices can communicate with each other through the idle communication channel.

[0002]

2. Description of the Related Art In a radio device such as a specific low-power radio device which has recently become widespread, as shown in FIG.
A plurality of wireless relay devices (repeaters) 51, 5 accommodating only communication channels (a, b, c,...) Having communication frequencies.
2, 53... Are installed, and a plurality of wireless terminal devices 51A to 51C, 52A to 5
A configuration in which 2C and 53A to 53C are connected is known. The communication between the wireless terminal devices is performed via the corresponding wireless relay device. However, FIG.
Since the combination of each of the wireless relay devices 51 to 53 and each of the wireless terminal devices 51A to 51C, 52A to 52C, and 53A to 53C is fixed, the wireless relay device 51 of the a channel is in use, for example. Sometimes,
b-channel or c-channel wireless relay devices 52, 5
There is a disadvantage that even if 3 is vacant, it cannot be used. In addition, since a wireless relay device is required for each communication channel, an increase in cost cannot be avoided.

In order to improve such a drawback, as shown in FIG. 9, a plurality of communication channel repeaters 61a, 61b, 61c... 61A, 61B, 61C,..., And a plurality of communication channels N1, N2, N3 of different radio frequencies as shown in FIG.
... and an occupied line consisting of a control channel C of a radio frequency different from this radio frequency is set, and one radio terminal device having a unique number to the radio relay device 61, for example, 61A
When a request for connection to another wireless terminal device having another unique number, for example, 61C, is made through the control channel C, a search is made for a free communication channel from among a plurality of communication channels, and the two wireless terminal devices 61A, The idle communication channel searched through the control channel C is notified to the wireless communication device 61C by a channel designation signal, and the wireless communication devices 61A and 61C can communicate with each other through the idle communication channel by relaying the idle communication channel. A multi-channel line connection scheme is provided.

[0004]

However, such a conventional multi-channel line connection system has the following problems. (1) When transmitting a call signal for a connection request from a plurality of wireless terminal devices to a wireless relay device and receiving an assignment of an empty communication channel from the wireless relay device, it is not always necessary that the call order and the connection order match. Therefore, it is unreasonable that a wireless terminal device that has transmitted a call signal later is assigned an idle communication channel before a wireless terminal device that has transmitted a call signal earlier. (2) In some cases, a call signal and a channel designation signal are transmitted from a plurality of wireless terminal devices and wireless relay devices randomly, and in this case, the channel designation signal arriving at the wireless terminal device is (call signal transmission count) X number of times of channel designation signal transmission), so that the control channel is occupied by one wireless terminal device for a long time, and the control channel utilization efficiency is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. The order in which calls are made by a wireless terminal device and the order in which connections are made to receive a free communication channel from a wireless relay device are made to coincide with each other. It is an object of the present invention to provide a multi-channel line connection system that improves the utilization efficiency.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises an occupied line comprising N communication channels of different radio frequencies and a control channel of a radio frequency different from this radio frequency. Are connected via a wireless relay device, and when a connection request from one wireless terminal device having a unique number to another wireless terminal device having another unique number is made through a control channel, N A search is made for a free communication channel from the plurality of communication channels, the free communication channel is searched for and secured, and the free communication channel searched through the control channel is notified to both wireless terminal devices by a channel designation signal. In a multi-channel line connection system in which terminals can communicate with each other through an idle communication channel, a wireless terminal having a number A is assigned a number C A connection request signal to the wireless terminal device is transmitted to the wireless relay device, and thereafter, within a certain period of time, the wireless terminal device of number B transmits a connection request signal to the wireless terminal device of number D to the wireless relay device, Before the relay device transmits the channel designation signal to the wireless terminal devices of Nos. B and D, the wireless terminal device of No. A transmits a connection request retransmission signal to the wireless terminal device of No. C after the elapse of the predetermined time. When transmitting to the relay device, the wireless relay device transmits a channel request signal to the connection request retransmission signal transmitted by the wireless terminal device of number A before transmitting the channel specification signal to the wireless terminal devices of number B and number D. It is characterized by transmitting a signal.

According to another aspect of the present invention, in the above-mentioned aspect, the wireless relay apparatus is configured to be able to transmit M channel designation signals in response to one connection request signal, and a plurality of wireless terminal apparatuses are connected continuously. When a request signal is received, only the M channel designation signals for the connection request signal from the last received wireless terminal device are transmitted, and only one channel designation signal for the connection request signal from another free terminal device is transmitted. It is characterized by the following.

According to another aspect of the present invention, in any one of the above aspects of the present invention, the wireless terminal device having the number A transmits a connection request signal to the wireless relay device, and the wireless relay device specifies a channel for the wireless terminal device having the number A. If the wireless terminal device with the number A transmits a connection request retransmission signal to the wireless relay device before transmitting the signal, the wireless relay device responds to the previously received connection request signal transmitted by the wireless terminal device with the number A. It is characterized in that all the channel designation signals are not transmitted, and only the channel designation signal for the connection request retransmission signal is transmitted.

[0009]

According to the first aspect of the present invention, after the wireless terminal device of the number A transmits a connection request signal to the wireless terminal device of the number C to the wireless relay device, the wireless terminal device of the number A within a predetermined time period Wireless terminal device transmits a connection request signal to the wireless terminal device of number D to the wireless relay device, the wireless relay device transmits a channel designation signal to the wireless terminal devices of number B and number D before transmitting the channel designation signal. , After the elapse of the predetermined time, the number A
When the connection request retransmission signal is transmitted from the wireless terminal device of No. C to the wireless terminal device of No. C, before transmitting the channel designation signal to the wireless terminal devices of No. B and No. D, A channel designation signal is transmitted in response to the connection request retransmission signal transmitted by the wireless terminal device.

According to the configuration of the present invention described in claim 2,
In the configuration of claim 1, when the wireless relay device is configured to transmit M channel designation signals in response to one connection request signal, the wireless relay device continuously connects from a plurality of wireless terminal devices. When a request signal is received, only the M channel designation signals for the connection request signal from the last received wireless terminal device are transmitted, and only one channel designation signal for the connection request signal from another wireless terminal device is transmitted.

According to the configuration of the present invention described in claim 3,
3. The configuration according to claim 1, wherein the wireless terminal device having the number A transmits a connection request signal to the wireless relay device, and the wireless relay device transmits a channel designation signal to the wireless terminal device having the number A before the wireless terminal device transmits the channel designation signal. When the wireless terminal device of A transmits a connection request retransmission signal to the wireless relay device, the wireless relay device does not transmit all the channel designation signals for the connection request signal transmitted by the wireless terminal device of number A previously received. In this way, only the channel designation signal for the connection request retransmission signal is transmitted.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a wireless device to which the multi-channel line connection system of the present invention is applied. 1 is a wireless relay device, and 10 is a plurality of wireless terminal devices connected to the wireless relay device 1. 2,3,4,5,6,7 out of 6
An example in which the units are connected is shown. Here, a free communication channel is secured between the wireless terminal device 2 and the wireless terminal device 3, a free communication channel is secured between the wireless terminal device 4 and the wireless terminal device 7, and the wireless terminal device 5 and the wireless terminal device The case where a free communication channel is secured with the device 6 is shown as an example.

A connection request signal 2a from the wireless terminal device 2 to the wireless terminal device 3 is transmitted through the control channel to the wireless relay device 1.
Then, after the wireless relay device 1 searches for and secures a free communication channel, the wireless relay device 1 notifies the wireless terminal devices 2 and 3 of the communication channel number using the channel designation signal 2b, and starts relaying the communication channel. After receiving the channel designation signal, the wireless terminal devices 2 and 3
Initiate a call over the specified call channel. Connection request signal 4a from wireless terminal device 4 to wireless terminal device 7 and connection request signal 5 from wireless terminal device 5 and wireless terminal device 6
Similarly, the wireless relay device 1 responds to the channel a by the channel designation signals 4b and 5b, and starts the relay operation through the respective communication channels.

FIG. 2 is a block diagram showing a specific configuration of the wireless relay device 1 of FIG.
1, control channel transmission / reception unit 12, speech channel # 1
Transmission / reception unit 13, transmission / reception unit 1 for communication channel # 2
4, communication channel # 3 transmission / reception unit 15, transmission antenna sharing unit 16, reception antenna distribution unit 17, transmission antenna 1
8, a receiving antenna 19. Note that the number of transmission / reception units of the communication channel is an example,
Four or more can be provided. The control unit 11 outputs the output signal 1
1a, 11b, 11c, and 11d are output to the control channel transmission / reception unit 12, the communication channel # 1 transmission / reception unit 13, the communication channel # 2 transmission / reception unit 14, and the communication channel # 3 transmission / reception unit 15, respectively. The operation of each part is controlled.
The receiving system includes the receiving antenna 19 to the receiving antenna distributing unit 1.
7, through the reception inputs 17a, 17b, 17c, 17d
Is distributed to the transmission / reception sections 12, 13, 14, and 15 by the transmission section. The transmission system includes the transmission / reception units 12, 13, 14, 15
Is transmitted from the transmission antenna 18 through the transmission antenna sharing unit 16. In the case of the control channel, the received control signal is notified to the control unit 11 by the output signal 12a of the control channel transmission / reception unit 12, and the control signal to be transmitted is transmitted by the output signal 11a from the control unit 11. Notified and sent.

FIG. 3 is a block diagram showing a specific configuration of the control unit 11 of FIG. 2. The control unit 11 includes a signal identification unit 20, an idle communication channel detection unit 21, a channel registration control unit 22,
Channel registration table 23, channel designation signal generator 2
4, a transmission signal buffer 25, a channel designation signal canceller 26, and a transmission control unit 27. The received control signal is the output signal 1 of the transmission / reception unit 12 of the control channel.
The signal is sent to the signal identification unit 20 by 2a, and if the signal is determined to be a connection request signal, an idle channel request is transmitted to the idle communication channel detection unit 21 by the signal 20a. The idle communication channel detector 21 sends a channel reservation request to the channel registration controller 22 by a signal 21a. The channel registration control unit 22 searches the channel registration table 23 to secure an empty communication channel, registers the communication channel, and registers the channel number through a signal 22a.
Send to 1.

The idle communication channel detecting section 21 notifies the transmission / reception section of the communication channel of FIG. 2 corresponding to that channel by any one of 11a, 11b, and 11c, and transmits a relay start request to the channel designation signal generating section 24. By notifying the channel number, a request for generating a channel designation signal is made. The channel designation signal generator 24 generates channel designation signal data and writes the channel designation signal data to the transmission signal buffer 25 through the output signal 24a. The transmission control unit 27 operates independently, and
If there is data to be transmitted in the transmission signal buffer 25, it is taken out and a transmission request is made to the transmission / reception unit 12 of the control channel via the output signal 11a.

If the received control signal is determined to be a connection request retransmission signal by the signal identification unit 20, a channel search instruction is issued to the channel registration control unit 22 through the output signal 20b.
The channel registration control unit 22 searches the content (calling source, connection destination) of the connection request retransmission signal to determine whether a channel has already been registered with the same content. If the channel designation signal has already been registered, the channel designation signal canceller 26 is instructed to delete the channel designation signal by the output signal 22d. The channel designation signal canceller 26 searches the contents of the transmission signal buffer 25 and deletes the channel designation signal.
The channel registration control unit 22 further requests the channel designation signal generation unit 24 to generate a channel designation signal via the output signal 22c. The channel designation signal generator 24 generates a channel designation signal and stores it at the head of the transmission signal buffer 25.

If the channel is not registered with the same content (calling source, connection destination) of the connection request retransmission signal, the channel registration control unit 22
3 to search for a free channel and register it. The channel registration control unit 22 requests the idle traffic channel detection unit 21 to issue a traffic channel relay instruction through the output signal 22a. The idle communication channel detecting section 21 outputs signals 11a, 11b, 11d to the communication channel corresponding to the channel.
The relay instruction is issued by either of the above. The channel registration control unit 22 further requests the channel designation signal generation unit 24 to generate a channel designation signal through the output signal 22c. The channel designation signal generator 24 generates a channel designation signal and stores it at the head of the transmission signal buffer 25.

FIG. 4 is a block diagram showing a specific configuration of each of the wireless terminal devices 10 of FIG. 1. The wireless terminal device 10 includes a modulation circuit 32, a transmission unit 33, a connection request signal generation unit 34, and a transmission control unit 35. , T1 timer 36, channel designation signal detection unit 37, antenna transmission / reception switching unit 38, audio amplifier 42, demodulation circuit 43, reception unit 44, synthesizer 45, and the like. Turning on the call switch 40 instructs the transmission control unit 35 to call. The transmission control unit 35 outputs the transmission instruction signal 35c, and in response to this, the transmission unit 33 enters the transmission state, and the antenna transmission / reception switching unit 38 enters the transmission state. The transmission control unit 35 is T1
The reset signal 35d is output to the timer 36, and in response to this, the T1 timer 36 is reset and enters a standby state. Further, the transmission control unit 35 instructs the connection request signal generation unit 34 to transmit a connection request signal through a signal 35a,
The stop state is instructed to the audio amplifier 42 through the signal 35b, whereby the driving of the speaker 41 is prohibited.

The connection request signal generator 34 transmits a line connection signal 34a to the modulation circuit 32. The modulation circuit 32 modulates the voice and the line connection signal from the microphone 31 and sends the modulated signal as a modulated signal 32a to the transmission unit 33. The transmission unit 33 transmits from the antenna 39 via the antenna transmission / reception switching unit 38. When the generation of the connection request signal is completed, the connection request signal generation unit 34 sends an end signal 34b to the transmission control unit 35.
Notify. In response, the transmission control unit 35
The output of b, 35c, 35d is stopped. As a result, the transmission unit 33 stops transmission, the antenna transmission / reception switching unit 38 enters a reception state, and the audio amplifier 42 is turned on, so that the speaker 41 is driven. At the same time, the T1 timer 36 starts measuring, and a certain time (T1)
Has elapsed, the T1 timer 36 sends an end signal 36a to the transmission control unit 35.

Thus, the transmission control unit 35 outputs the signals 35a, 35b, 35c, 35d again,
Is in the transmission state, and the antenna transmission / reception switching unit 38 is also in the transmission state. Here, the connection request signal generating section 34 generates a connection request retransmission signal, the modulation circuit 32 modulates the voice from the microphone 31 and the line connection signal, and sends the modulated signal to the transmission section 33 as a modulation signal 32a. Transmission is performed from the antenna 39 via the reception switching unit 38. Further, the T1 timer 36 is reset and enters a standby state.
When the connection request signal generator 34 finishes generating the connection request retransmission signal, it notifies the transmission controller 35 of an end signal 34b (in response to this, the transmission controller 35 outputs the output signal 35c,
Stop 35d and 35b. ). Thereby, the transmitting unit 3
3 stops transmission, the antenna transmission / reception switching unit 38 enters the receiving state, and the audio amplifier 42 enters the ON state, so that the speaker 41 enters the driving state. At the same time, T
The 1 timer 36 starts measurement, and when a certain time (T1) has elapsed, the T1 timer 36 sends an end signal 36 to the transmission control unit 35.
Send a. In response to this, the transmission control unit 35 enters a state where the call switch 40 is turned on.

When a channel designation signal is received during the measurement of the T1 timer 36, channel information is output from the channel designation signal detector 37 to the synthesizer 45 via a signal 37b. As a result, the synthesizer 45 shifts the frequency to this channel. Further, a signal 37a is output from the channel designation signal detection unit 37 to the T1 timer 36, the T1 timer 36 is stopped, the transmission control unit 35 is in a talking state, the audio amplifier 42 is in an on state, and the speaker 41 is in a driving state. Becomes

FIG. 5 shows a first method of connecting a multi-channel line according to the present invention. When a connection request signal S is transmitted from the wireless terminal device 10 to the wireless relay device 1, Before a predetermined time (T1) elapses from the relay device 1, the channel designation signals CS1, CS2, CS3
9 shows a timing chart when the is returned and the contents of the transmission signal buffer 25 in the wireless relay device 1. a indicates a transmission signal of the wireless terminal device 10, S indicates a connection request signal, and b indicates a transmission signal of the wireless relay device 1. Note that the contents of each transmission signal buffer 25 change over time. The number of channel designation signals is an example. When the wireless relay device 1 receives the connection request signal S from the wireless terminal device 10 and receives the connection request signal S, a channel designation signal CS1, CS2, CS
Create 3. Then, each is copied to the transmission signal buffer 25. When the wireless relay device 1 transmits the channel designation signal CS1 as shown in a within a predetermined time (T1),
CS2 and CS3 remain in the transmission signal buffer 25, and when the channel designation signal CS2 is further transmitted, CS3 remains in the transmission signal buffer 25. When this is also transmitted last,
The contents of the transmission signal buffer 25 become empty.

FIG. 6 shows a second method for connecting a multi-channel line according to the present invention. The connection request signal S1 is transmitted from the wireless terminal device 10 to the wireless relay device 1. FIG. 9 shows a timing chart when the wireless terminal device 10 transmits the connection request retransmission signal S2 and the content of the transmission buffer 25 in the wireless relay device 1 when the device 1 cannot transmit the channel designation signal within a predetermined time (T1). It is. a is a transmission signal of the wireless terminal device 10, S1 is a connection request signal, S2 is a connection request retransmission signal, b is a transmission signal of the wireless relay device 1, CS11, CS12, CS13, C
S21, CS22, and CS23 indicate channel designation signals. When the wireless relay device 1 receives the connection request signal S1 from the wireless terminal device 10 and receives the connection request signal S1, it searches and secures an idle communication channel and notifies the channel number of the channel designation signal CS11, CS12, CS.
13 are created, and each is copied to the transmission signal buffer 25.

Next, if these channel designation signals cannot be transmitted within a predetermined time (T1) for some reason, the wireless terminal device 10 transmits a connection request retransmission signal S2. When receiving this, the wireless relay device 1 receives the connection request retransmission signal S1 received from the transmission signal buffer 25 from the transmission signal buffer 25.
Channel designation signals CS11, CS12, CS1 for
3 is deleted, and channel designation signals CS21, CS22, and CS23 for the connection request retransmission signal S2 are created, and each is copied to the transmission signal buffer 25. In this case, the previously reserved channel is used as it is as the communication channel number. When the wireless relay device 1 is in the transmittable state, the contents of the transmission signal buffer 25 are sequentially transmitted.

FIG. 7 shows a third method for connecting a multi-channel line based on the present invention. One wireless terminal A sends a signal to the wireless relay device 1 (for example, to the wireless terminal C). ) Although the connection request signal S11 has been transmitted, the wireless relay device 1 cannot transmit the channel designation signal within the fixed time (T1), and the other wireless terminal device B (for example, the wireless terminal device D) within the fixed time (T1). Timing chart when the connection request signal S21 is transmitted and the wireless terminal device A transmits the connection request retransmission signal S12 after a certain time (T1) elapses, and the transmission signal in the wireless relay device 1 3 shows the contents of the buffer 25. a is a transmission signal of the wireless terminal device A, S11 and S21 are connection request signals, S12 is a connection request retransmission signal, b is a transmission signal of the wireless terminal device B, c is a transmission signal of the wireless relay device 1, CS11
1, CS112, CS113, CS211, CS21
2, CS213 indicates a channel designation signal.

When the wireless relay device 1 receives the connection request signal S11 from the wireless terminal device A and receives the connection request signal S11, the wireless relay device 1 searches for and secures an idle communication channel and notifies the channel number of the channel designation signals CS111 and CS11.
2 and CS113 are prepared, and each is transmitted signal buffer 2
Copy to 5. Next, a connection request S2 is sent from the wireless terminal device B.
When the relay apparatus 1 receives this, when the relay apparatus 1 receives this, it searches and secures an empty channel, and specifies channel designation signals CS211, CS212, and CS212 for notifying the channel number.
Create CSs 213 and copy each to the transmit signal buffer. In this case, CS112 and CS113 are erased leaving the previously set channel designation signal CS111. Next, if the channel designation signal cannot be transmitted within a predetermined time (T1) for some reason after the transmission of the connection request signal S11, the wireless terminal device A transmits a connection request retransmission signal S12. Upon receiving this, the wireless relay device 1 receives, from the transmission signal buffer 25, the channel designation signal CS111 for the connection request signal S11 received earlier.
Is deleted, and instead, a channel designation signal CS12 for the connection request retransmission signal S12 is created, and this is copied to the head of the transmission signal buffer 25. In this case, as the communication channel number, the channel previously reserved for the connection request signal S11 is used as it is. When the wireless relay device 1 is in the transmittable state, the contents of the transmission signal buffer 25 are sequentially transmitted. According to this method, the communication channel can be reliably connected to the wireless terminal device A that has transmitted the connection request signal S11 earlier than the wireless terminal device B that has transmitted the connection request signal S21 later.

As described above, according to the present invention, the following effects can be obtained when connecting a multi-channel line. (1) Transmit a call signal for a connection request from a plurality of wireless terminal devices A and B to the wireless relay device 1 and
When receiving a free call channel from the wireless terminal device B, the wireless terminal device B that has transmitted the call signal later ensures that the free call channel is allocated before the wireless terminal device B that has transmitted the call signal. Since this can be prevented, the calling order and the connection order can be matched, which is rational. (2) Since the calling signal and the channel designation signal are not transmitted randomly from the plurality of wireless terminal devices A and B and the wireless relay device 1, the control channel is not occupied by one wireless terminal device for a long time. Thus, the use efficiency of the control channel can be improved. Although the number of wireless terminal devices has been described by way of example in the text, this number can be arbitrarily changed according to the purpose, application, and the like. Further, the present invention can be applied to any wireless field that employs a multi-channel access method within the provisions of the radio equipment for a specific low-power radio station.

[0029]

As described above, according to the present invention, after the wireless terminal device of the number A transmits a connection request signal to the wireless terminal device of the number C to the wireless relay device, the wireless terminal device of the number B When the wireless terminal device transmits a connection request signal to the wireless terminal device of number D to the wireless relay device, the wireless relay device transmits a channel designation signal to the wireless terminal devices of number B and number D, Number A after the fixed time has passed
When the connection request retransmission signal is transmitted from the wireless terminal device of No. C to the wireless terminal device of No. C, before transmitting the channel designation signal to the wireless terminal devices of No. B and No. D, Since the channel designation signal is transmitted in response to the connection request retransmission signal transmitted by the wireless terminal device, the order in which calls are made by the wireless effect device matches the order in which the wireless relay device receives an available communication channel. At the same time, the control channel utilization efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a wireless device to which a Marul channel connection system of the present invention is applied.

FIG. 2 is a block diagram illustrating a configuration of the wireless relay device of FIG. 1;

FIG. 3 is a block diagram showing a configuration of a main part of FIG. 2;

FIG. 4 is a block diagram illustrating a configuration of the wireless terminal device of FIG. 1;

FIG. 5 is a timing chart showing a first method for connecting a multi-channel line according to the present invention.

FIG. 6 is a timing chart showing a second method for connecting a multi-channel line according to the present invention.

FIG. 7 is a timing chart showing a third method for connecting a multi-channel line according to the present invention.

FIG. 8 is a block diagram showing a conventional example.

FIG. 9 is a block diagram showing another conventional example.

FIG. 10 is a schematic explanatory diagram of a multi-channel line.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 wireless relay device 2 to 7, 10 wireless terminal device 11 control unit 12 control channel transmission / reception unit 13 to 15 communication channel transmission / reception unit 20 signal identification unit 21 idle communication channel detection unit 22 channel registration control unit 23 channel registration table 24 Channel designation signal generation unit 25 Transmission signal buffer 26 Channel designation signal canceller 27 Transmission control unit 32 Modulation circuit 33 Transmission unit 34 Connection request signal generation unit 35 Transmission control unit 36 T1 timer 37 Channel designation signal detection unit 38 Antenna transmission / reception switching unit 43 demodulation circuit 44 receiver 45 synthesizer

Claims (3)

(57) [Claims] An occupied line comprising N communication channels of different radio frequencies and a control channel of a radio frequency different from the radio frequency is provided, and a plurality of radio terminal devices are connected via a radio relay device. When a connection request is made from one wireless terminal device having a unique number to another wireless terminal device having another unique number through a control channel, an empty communication channel is searched and secured from the N communication channels. A multi-channel line that notifies both wireless terminal devices of the idle communication channel searched through the control channel by a channel designation signal and relays the empty communication channel to enable communication between the two wireless terminal devices through the idle communication channel. In the connection method, the wireless terminal device of number A transmits a connection request signal to the wireless terminal device of number C to the wireless relay device Thereafter, within a certain period of time thereafter, the wireless terminal device having the number B transmits a connection request signal to the wireless terminal device having the number D to the wireless relay device, and the wireless relay device transmits the connection request signal to the wireless terminal devices having the number B and the number D. Before the channel designation signal is transmitted, if the wireless terminal device of the number A transmits a connection request retransmission signal to the wireless terminal device of the number C to the wireless relay device after the elapse of the predetermined time, the wireless relay device
And transmitting a channel designation signal in response to the connection request retransmission signal transmitted by the wireless terminal device of number A before transmitting the channel designation signal to the wireless terminal device of number D. method. 2. The wireless relay device is configured to be able to transmit M channel designation signals in response to one connection request signal, and to receive connection request signals continuously from a plurality of wireless terminal devices, Only the M channel designation signals for the received connection request signal from the wireless terminal device are transmitted, and the other wireless terminals
2. The multi-channel line connection system according to claim 1, wherein only one channel designation signal is transmitted in response to the connection request signal from the terminal device . 3. The wireless terminal of number A transmits a connection request signal to the wireless relay device, and before the wireless relay device transmits a channel designation signal to the wireless terminal device of number A, the wireless terminal of number A When the device transmits the connection request retransmission signal to the wireless relay device, the wireless relay device does not transmit any channel designation signal corresponding to the connection request signal received by the wireless terminal device of the number A previously received, and 3. The multi-channel line connection system according to claim 1, wherein only a channel designation signal for the retransmission signal is transmitted.