JPH0810954B2 - Cordless telephone device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cordless radiotelephone device that can maintain a call even when a child device goes out of the call range of a parent device and returns to the call range of the parent device again. It is a thing.

[Conventional technology]

Conventionally, in a cordless wireless telephone device, it is not possible to make a call if the cordless handset goes out of the call range of the base unit, but in this case, if the handset returns to the call range of the handset within a certain time, the call will continue until now. It is now possible to secure calls on different channels.

[Problems to be Solved by the Invention] However, in such a conventional device, if the power switch of the child device is accidentally turned off when the child device is out of the communication range of the parent device, the parent device keeps the channel for a certain period of time. Holding For this reason, even if the slave unit turns on the power switch again, the slave unit returns to the control channel, and the master unit retains the channel that has been talking until then, and does not return to the control channel until a certain period of time elapses. Had a problem that he could not make a call.

[Means for solving the problem]

In order to solve such a problem, the present invention provides a means for detecting movement of a child device out of the communication range, and a control unit for controlling the channel of the parent device when the detection is performed, It is provided with a signal detecting means for alternately setting the channels.

[Action]

When the child device goes out of the call range of the parent device, the parent device detects it and alternately selects the call channel and control channel for a certain period of time, and when a signal from the child device is detected on the control channel during that time, it becomes idle. If a signal from the handset is detected on the call channel on which the call has been made, the call continues on that channel.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, M is a master unit, S is a slave unit, and the master unit M is an external line terminal 1, an incoming call detection circuit 2, a dial transmission circuit 3, a driver 4, a CPU 5, a 2-wire 4-wire conversion circuit 6, a wireless transmission / reception unit 7,
It is composed of a speaker 9, a microphone 10 and an antenna 11. Handset S is dial key 33, driver 34, CPU3
5, display 36, wireless transceiver 37, speaker 39, handset 4
0, antenna 41. Note that the child device sends an alarm when it moves out of the communication range.

FIG. 2 is a flow chart showing the operation of the apparatus shown in FIG. In the figure, when the initial process is performed in step 100 and it is determined in step 101 that there is a request for activation on the control channel, an empty call channel is searched for, and the set channel is set from the control channel to the idle call as shown in step 102. Move to channel. When the handset goes out of the communication range, it is determined in step 103 that there is no data from the handset. Then, since the out-of-service area detection output is obtained in step 104, the out-of-service timer (30 seconds) is started as shown in step 105, and it is determined whether or not the area is within the service area as shown in step 106.

At this time, if the cordless handset is back in range, step 10
The out-of-range timer is stopped as shown in 7, and the flow returns to step 103. Then, in step 103, it is determined that there is data from the handset, and if it is determined in step 114 that it is outside line call data, in step 115, the outside line acquisition processing is performed. If it is determined in step 114 that the data is not outside line call data, and if it is determined in step 116 that it is call channel opening data, the call channel stop and control channel set processing is performed as shown in steps 117 and 118. If it is determined in step 116 that the data is not the data for opening a call channel, other data processing is performed as shown in step 119.

If the range detection is not performed in step 106, the set channel shifts to the control channel as shown in step 108. Then, when it is determined in step 109 that there is no control channel activation request, and when it is determined that the out-of-range timer time has not expired as shown in step 110, the set channel is the call channel, that is, the set channel has been set up to now as shown in step 111. And the flow returns to step 106. Therefore, as the set channel, the control channel and the call channel are alternately selected until the out-of-range timer expires.

That is, if it is determined in step 106 that the main unit is not within the communication range, the control channel is shifted to in step 108, and if the control channel activation request is not determined in step 109, the out-of-range timer is not timed out in step 110. After confirming that, in step 111, the channel is switched to the communication channel used until now. Therefore, until the out-of-range timer in step 110 expires, if the child device returns to the communication range of the parent device, this is detected in step 106, the out-of-range timer is stopped in step 107, and the flow returns to step 103 to return to the normal operation. Processing is performed. If the slave unit accidentally turns off the power switch and turns it on again, the slave unit issues a control channel activation request to the master unit, and the flow returns to step 102, and the master unit is newly opened. It searches for a channel, sets that free channel as the call channel, and transitions to that call channel to continue the call.

In step 110, it is determined that the out-of-range timer has timed up, and if it is determined in step 112 that the outside line is being captured, the outside line release process is performed in step 113.

In the above example, the parent machine has the initiative,
The child machine may take the initiative.

〔The invention's effect〕

As described above, according to the present invention, when the child device goes out of the communication range of the parent device, the parent device alternately selects the channel and the control channel that have been talking until a certain time. , When the cordless handset returns to the coverage area, the cordless handset can detect the signal from the cordless handset on either channel. The inconvenience that could not be solved is solved, and a smooth call can be made.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of the apparatus of FIG. 1 ... External line terminal, 5,35 ... CPU, 7,37 ... Wireless transceiver, 36 ... Display.

Claims (1)

[Claims] 1. A main unit connected to a central office line and a slave unit wirelessly connected to the master unit. Within a certain time after detecting movement of the slave unit out of the coverage area In the cordless telephone device in which the call is resumed by using the call channel used before moving out of the call range and the call channel is set to the control channel from the call channel together with the parent and child devices, if the call is not returned within the fixed time, Out-of-service area detection means for detecting movement of the mobile device out of the communication area, and when the out-of-service area detection means detects the out-of-service area of the child device, the control channel and the communication channel are alternately set for the fixed time. Signal detection means for detecting the presence / absence of a signal from each channel, and when the signal detection means detects a signal from the control channel, the communication is restarted through the idle communication channel. At the same time, when a signal from the call channel is detected, the call is resumed by this call channel.