JPS6158341A - Radio terminal unit connection control system - Google Patents

Abstract

PURPOSE:To permit effective radio terminal unit connection control by leading only a calling radio terminal unit to a communication channel capable of use from a control channel and rendering the other radio terminal units than a responding radio terminal unit at the time of a call arrival. CONSTITUTION:When a cordless telephone set 11 transmits a call signal along with an identification signal to a main unit 10, the unit 10 searches a vacant channel according to the received call signal. Then it transmits a channel designation signal represented the searched vacant channel. When the receiving telephone set 11 switches the channel over to the designated communication channel, the dial tone from a switchboard is transmitted to the telephone set 11. When a call signal arrives at the main unit 10 from the switchboard through a subscriber's line, the unit 10 effects search of a vacant communication channel, and a call arrival signal including a channel designation signal corresponding to the searched vacant communication channel along with an identification code using a control channel. The telephone set 11 transmits a response signal to the unit 10, and switches the designated communication channel.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a wireless terminal device connection control method for controlling the connection between a master station communication device and a plurality of wireless terminal devices, and in particular, to The present invention relates to a method preferably applied to connection control between one cordless telephone and a main device connected to a telephone subscriber line.

[Technical background of the invention]

There is a telephone system as shown in FIG. 5 as a system in which a single telephone subscriber line is shared by a plurality of telephones. FIG. 5 shows a telephone system having three telephones 1, 2.3, each having a handset la, 2a, 3a, and a dial 1b, 2b, 3b.
．． 2.3 are connected to the main unit 7 via circuits 84 and 5.6, respectively. The main device 7 is connected to a central office exchange (not shown) via a telephone subscriber line terminal 8. Also, phone 1
．． Lines 4, 5, 6 connecting 2.3 and the main device 7 are two telephone lines, respectively, and the main device 7 and the telephones 1, 2.3.
It consists of 4 lines, 2 data transmission lines used for connection control with 4 lines. 6 shows the relationship of data exchange between the telephones 1, 2.3 and the main device 7. As is clear from FIG. 6, telephone 1.
2.3 and the main device 7 are carried out in a time-sharing manner during predetermined times T1, 'r, and T3. That is, data exchange between telephone 1 and main device 7 takes place during time T1, data exchange between telephone 2 and vehicle equipment f7 takes place during time T, and data exchange between telephone 3 and main device 7 takes place during time T1. Data exchange with the device 7 takes place during time T3.

For example, if handset la of telephone l is lifted and a call is made from telephone l, an off-footer signal is sent from telephone l to main unit 7 via line 4 at time 11. In response to this off-hook signal, the main device 7 connects the line 4 corresponding to the telephone 1 to the telephone subscriber line. Thereby, the dial tone sent from the central office exchange via the telephone subscriber line is confirmed on the telephone set 1, and then the dial 1b is operated to establish a communication path.

Also, when the main device 7 receives a 1611z calling signal sent from the central office exchange via the telephone subscriber line,
The main device 7 is connected to the time T1, T2 via the lines 4, 5.6.
, 'r3, respectively, to send out a ringing tone generation signal.

Telephones 1, 2.3 are at time TI.

At T2TT3, the ringing tone generation signal is detected and each ringing tone is sounded. In this state, for example, if you lift the handset 1-1b of the telephone 1,
Telephone 1 sends an off-hook signal to main device 7 at time 'ri, similarly to when making a call. In response to the detection of this off-hook signal, the main device 7 connects the telephone 11 to the corresponding line 4.
and a telephone subscriber line. Also, the main device 7 is 16H
z ringing signal (the central office exchange stops sending out the 16 Hz ringing signal due to the formation of subscriber iR1 DC loop), and in response, 1! Talking device 1, 2.3
To time TI r T! + Send a ringing stop signal at T3. Each telephone 1.2.3 detects this ring stop signal and stops ringing.

[Problems with background technology]

However, in the telephone system as described above, the lines 4, 5, 6 tangentially connecting the main device 7 and each telephone 1, 2, 3
Considering the case where a wireless line is used instead of the wired line Ma, frequencies are assigned to each according to the number of wired lines,
The configuration is such that the main device 7 constantly sends out radio waves to transmit necessary data, such as data that informs each telephone of the allocated time T, , T2, T, corresponding to each telephone. It is necessary to secure vast frequency resources to avoid radio wave interference between
For this reason, there was little possibility of its realization.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a wireless terminal equipment connection control system that makes effective use of frequency resources.

[Summary of the invention]

In the wireless terminal device connection control method of the present invention, at least one control channel and a plurality of communication channels are set as wireless channels, and when a call is made from the wireless terminal device, only the calling wireless terminal device can be used from the control channel. In addition, the special number ζ for incoming calls to wireless terminal equipment is designed so that after all telephones are once routed to the same communication channel, only the wireless terminal equipment that responded is left and the others are returned to the standby state. will be accomplished.

Embodiment of the Invention FIG. 1 shows an embodiment of a wireless telephone system employing the wireless terminal device connection control method of the present invention.

In FIG. 1, there are three sets of wireless telephone systems A and B.

C is shown, and each set of wireless telephone systems is connected to three cordless telephones 11, 12, 13 and telephone subscriber line terminal 8, as representatively shown in detail in wireless telephone system A; It consists of a main device 10 that performs wireless (ζ) connection control between telephone subscriber lines and cordless telephones 11, 12, and 13.

The radio lines shown in Table 1 that allow simultaneous transmission and reception are used in the apparatus shown in FIG.

Table 1 Here, the control channel is used to control the connection between the main device and the cordless telephone prior to a call, and is used for multiple sets of wireless telephone systems, for example A and B.

Shared with C. Furthermore, the first to m-th communication channels are mainly used for telephone calls, and any unused communication channels can be used by any wireless telephone system without being fixedly assigned to each set of wireless telephone systems. A multi-channel access method is adopted.

Next, a wireless terminal device connection control method according to the present invention employed in the wireless telephone system shown in FIG. 1 will be explained using flowcharts shown in FIGS. 2 to 4. In FIGS. 2 and 4, broken lines indicate the transmission and reception of signals on the control channel, and solid lines indicate transmission and reception of signals on the speech channel.

The flow chart shown in FIG. 2 shows the cordless telephone 11.
This shows the case where a call is made from.

When the handset lla is taken off-hook at the cordless telephone 11 to make a call, the cordless telephone 1
1 to the main device 10, the control channel (frequency afc(U)
), a calling signal is sent along with the identification code 11 for identifying the cordless telephone 11. Main device 10
When it receives the calling signal from the cordless telephone 11, it searches for an empty communication channel, and sends a channel designation signal indicating the searched empty communication channel (designated communication channel) to the control channel (frequency fc (D )) and send it to the cordless telephone 11 using
At the same time, the designated call channel ζ is switched. When the cordless telephone 11 receives the channel designation signal from the main device 10, it immediately switches to the designated communication channel, and uses the designated communication channel to send a channel switching completion signal to the main device 10 (main device 10) along with the identification code IDl1. device 10
When it receives a channel switching completion signal from the cordless telephone 11, it turns on a relay (not shown) to close the telephone subscriber line DC loop (and sends an audio circuit on signal that instructs to turn on the audio circuit together with the identification code D11). The cordless telephone 11 then turns on an audio circuit (not shown).As a result, the dial tone generated from the central office exchange is transmitted to the cordless telephone 11 via the main unit 10 and the designated communication channel.
The cordless telephone 11 performs a dial operation in response to this dial tone and sends the dial signal to the main device 10.
The main device sends a full pulse of die 1 (or button ()) corresponding to the dial signal number ζ, D
) signal) to the central office exchange. This establishes a communication path with the other party. Note that the channel designation signal sent from the main device IO using the control channel is transmitted to other cordless telephones 12.1 other than the cordless telephone G'nll.
3, but also received by cordless telephones 12.1
3, the identification code is different from that of the local station, so no further response operation is performed.

Next, the incoming call operation when there is an incoming call from the central office exchange will be explained with reference to the flowchart shown in FIG. When the main device 10 receives a 16Hz paging signal from the telephone exchange on the subscriber line, the main device 10 searches for an empty communication channel and sends a channel designation signal corresponding to the empty communication channel. First, an incoming call signal including an identification code IDl1 corresponding to the cordless telephone 11 is sent out using a control channel (frequency 1afc(D)). When the cordless telephone 11 receives such an incoming call signal, it uses the control channel (frequency fC(U)) to send an incoming call response signal together with the identification code ID11 back to the main device 10, and immediately switches to the designated communication channel. Also, main device 1
0 performs switching to a designated communication channel in response to the incoming call response signal. When the cordless telephone 11 completes switching to the designated communication channel, it sends a channel switching completion signal using the designated communication channel together with the identification code IDl1. When the main device 10 receives the channel switching completion signal, it sends a standby signal using the communication channel with identification code ID1.
Upon receiving this standby signal, the cordless telephone 11 turns off transmission and enters a standby state.

The main unit 10 is then switched back to the control channel and transmits the incoming call signal including the channel designation signal to the cordless telephone 121.
This is sent out using the control channel together with the corresponding identification code ID12. When the cordless telephone 12 receives such an incoming call signal, it sends an incoming call response signal together with the identification code IDI 2 using the control channel, and then immediately switches to the designated communication channel. When the in-vehicle filO receives the incoming call response signal, it switches to the designated call channel, and when the cordless telephone 12 completes switching to the designated call channel, it uses the call channel to send a channel switching completion signal along with the identification code IDI2. In response to the channel switching completion signal, the main unit 10 sends out a standby signal together with the identification code IDI 2, which causes the cordless telephone 12 to turn off transmission and enter a standby state.

The main device 10 is then switched back to the control channel and sends out an incoming call signal including a channel designation signal together with the identification code ID 13 corresponding to the cordless telephone 13 using the control channel. When the cordless telephone 13 receives such an incoming call signal, it sends out an incoming call response signal together with the identification code IDI 3 using the control channel, and then is immediately switched to the designated communication channel. When the main device 10 receives the incoming call response signal, it switches to the designated call channel,
When the cordless telephone 13 completes switching to the designated communication channel, it sends a channel switching completion signal using the specified communication channel together with the identification code ID 1.3, and the main device 10 waits in response to the channel switching completion signal. The signal is sent along with the identification code ID13, and the cordless telephone 13 turns off its transmission and enters a standby state.

When the main device 10 receives a calling signal from the central office exchange in this manner, the cordless telephones 11, 12, 13 are guided to the 1st and 1st communication channels, and their respective transmissions are turned off and placed in a standby state. In this state, the main device 10 sends out a bell ringing signal together with the group identification code IDQ including the cordless telephones 11, 12, 13 using the communication channel, and causes the cordless telephones 11, 12, 13 to send a ringing tone. For example, all cordless phones
When the handset is off-hook in response to the ringing tone, an off-hook signal is sent from the cordless telephone 11 at the same time as the identification code ID11 for identifying the cordless telephone 11. When the main device 10 receives this off-hook signal, it turns on a relay that closes the subscriber line DC loop, and sends out an audio circuit on signal together with the identification code ID11. This audio circuit on signal (from this cordless telephone (Table 11 turns on the audio circuit and changes the call status. Here, other cordless telephones f) 12.13 also receives the audio circuit on signal, but the identification code or the Since it does not belong to the station, it returns to standby mode without turning on the audio circuit.

FIG. 4 shows another embodiment of the incoming call operation when there is an incoming call from the central office exchange. In this embodiment, the main device 10 and the cordless telephone 11, 12 until the ring tone is sent out.
．． Specific cordless telephones 4/wo,
In the actual JA1 example shown in FIG. 4, the cordless telephone 11 is configured to perform the function as a representative. In other words, when there is an incoming call with a J (i Hz) calling signal from the central office exchange, the main device 1
0 uses the soot control channel to send an incoming call signal containing the channel designation (M number) together with the identification code ID11 corresponding to the cordless telephone 11. When the cordless telephone 411 receives this incoming call signal, it sends an incoming call response signal. identification code ID11a and the main device 10 using the control channel.
and then switches to the designated call channel. When the cordless telephones 12 and 13 receive the incoming call signal, they immediately switch to the designated communication channel. At this point, the cordless telephones 12 and 13 do not return the incoming call response signal to the main device 10. When the main device 10 receives an incoming call response signal from the cordless telephone 11, it switches to a designated communication channel. Another cordless one! When the switching to the designated communication channel is completed, the handset 11 transmits a channel switching completion signal together with the identification code IDl1 using the communication channel. When the main device 10 receives the channel switching completion signal, it sends out a bell ringing 'fJb signal together with the identification code IDl1, thereby causing the cordless telephones 11, 12.1
A ring tone is generated from 3. The following operations are similar to those shown in FIG. However, FIG. 4 shows a case where the cordless telephone 12 responds to the ringing tone and goes off-hook.

In the case of the flowchart shown in FIG. 4, although the operation of the cordless telephones 12 and 13 cannot be confirmed on the main device 10, the signal sending timing from the main device 10 is delayed for a certain period of time, or the signal transmission timing from the cordless telephone 11 is delayed. By extending the sending timing of the response signal by a certain length, etc., the system operates without any problems. Furthermore, the method shown in the flowchart shown in FIG. 4 has the advantage that the connection control time can be shortened compared to the method shown in FIG. 3.

Note that the present invention is not limited to cordless telephone systems. The present invention can be applied to any system that selects 21 usable channels from a plurality of wireless channels and controls connections between a master station communication device and a plurality of wireless terminal devices.

[Effects of the Invention] As explained above, according to the present invention, it is possible to reliably establish wireless communication (i-route) between a master station communication device and a wireless terminal device, and moreover, effective use of frequency resources can be achieved. A wireless terminal device connection control method can be provided.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a telephone system to which this invention is applied;
2, 3, and 4 are flowcharts showing an embodiment of the present invention, and FIG. 5 is a configuration diagram of a conventional telephone system.
FIG. 6 is a timing chart illustrating the operation of the telephone system shown in FIG. 8...Telephone subscriber line terminal, 10...Main device, 11°12.13...Cordless telephone. Figure 1 ρ Figure 21: L, 1 Figure 4 Figure 5 Figure 6

Claims (5)

[Claims] (1) In a wireless terminal device connection control method that selects an available channel from among multiple wireless channels and connects a master station communication device and one of the multiple wireless terminal devices using the selected channel. , When a call is made from the wireless terminal device side, the system guides only the wireless terminal device to an available channel based on the identification signal unique to the wireless terminal device sent from the wireless terminal device that made the call. By doing this, a connection is established between the wireless terminal device and the master station communication device, and when a call is made from the master station communication device, all wireless terminal devices are connected to an available channel by once. By sending a calling signal to the devices, leaving only the wireless terminal device that responded to this calling signal and restoring the other wireless terminal devices to the standby state, the master station communication device and the wireless device that responded A wireless terminal device connection control method characterized by establishing a connection with the device. (2) Wireless terminal device connection control according to claim (1), characterized in that when a call is made from the master station communication device, all the wireless terminal devices are sequentially guided to available channels. method. (3) The wireless terminal device connection control method according to claim (1), characterized in that the master station communication device sends out a paging signal after confirming channel switching completion signals from all wireless terminal devices. . (4) Wireless terminal device connection according to claim (1), wherein the master station communication device transmits a paging signal after confirming only a channel switching completion signal from a specific wireless terminal device. control method. (5) The master station communication device is a main device of a cordless telephone system connected to a telephone subscriber line, and the plurality of wireless terminal devices are cordless telephones connected to the main device via a wireless line. A wireless terminal device connection control method according to claim (1).