JPS58205343A - Call duration limit type radio communication system - Google Patents

Abstract

PURPOSE:To attain the effective use of a radio wave, by providing one set of master station and plural sets of slave stations using this master set in common, and limiting the time in call of a slave set during a calling by a call request of other slave sets other than in call, when forming a channel between the master station and one slave station by using the same radio frequency. CONSTITUTION:When a slave telephone set 100-2 hooks off while a master telephone set 1-1 and a slave telephone set 100-1 in call, a channel control section 54 of the slave telephone set 100-2 detects the off-hook and that the radio line is used by the other slave set, and transmits a call request signal to the master set for a short time automatically on a radio wave other than that for the call. When the master set receives this call request signal, the master set operates the time in call monitoring section 14 and transmits a signal to a channel release section 15 after 5min. Then, the disconnect section 15 instructs the disconnection of the line to a connection control section 3 after 10sec so as to disconnect the line during the call forcedly. A disconnection notice tone is transmitted from disconnection tone transmitting section 16 to a caller during this 10sec.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time-limited wireless communication system comprising a plurality of handsets with selective calling devices.

When a telephone line is configured using a wireless network such as a disaster prevention administrative radio system, in order to use radio waves effectively, one base unit with a selective calling device is connected to multiple handsets with a selective calling device. are placed. In this case, transmission and reception are performed using a pair of radio frequencies, and the pair of radio frequencies is shared by a plurality of handsets.
If one handset requests to talk to another handset while it is talking to R, it is possible to limit the talk time of the handset during the call, which will allow each handset to use the same amount of time equally. It is possible to measure the

In the conventional wireless communication system, when one handset uses a pair of radio frequencies, the other handsets have no choice but to wait until the handset that is talking ends the call.

On the other hand, there was a drawback in that the handset that was in the middle of a call did not know that another handset wanted to talk, and could inadvertently monopolize one call line for a long period of time.

An object of the present invention is to limit the talk time of the handset during a call when a handset requests to talk to another handset while it is talking to a base. The purpose of the present invention is to provide a call time limited wireless communication system that can equalize the line usage time of each handset.

The talk time limited wireless communication system according to the present invention is composed of one base unit and multiple slave units, and the multiple slave units share one base unit and use the same radio frequency to communicate with the base unit. A communication path is formed between the terminal and one of the plurality of slave units.

The wireless communication system according to the present invention includes the following first and second means. The first method is a means for notifying the base unit whether or not another slave unit wishes to make a new call, regardless of the operation of the slave unit that is currently talking to the base unit. , consisting of a circuit device with multiple tubes. .

The second means works to limit the call time of the handset that is currently on a call when there is a desire to make a call, and to not impose this restriction when there is no desire to make a call. It is a means for this, and is made up of a circuit device having a plurality of cylinders.

By means of the second means, a new communication channel is formed only after a certain period of time has elapsed since the communication request was sent.

Hereinafter, the call time limited wireless system according to the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the call time limited wireless communication system according to the present invention.

In FIG. 1, 1-1 to 1-n and 100-1 to 1
0G-m are the first to nth master telephones and the first to mth child telephones, respectively.

In the base unit, 2 is a telephone exchange, 3 is a connection control unit, 4 is a selective call signal unit, 5 is a call path control unit, 6 is a signal amplification unit, 71 is a radio transmitter/receiver unit, 81 is a power supply line, 91 is an antenna,
10 is a signal amplification section, 11 is a response signal detection section, 12 is a call request signal detection section, 13 is an incoming call control section, 14 is a call time monitoring section, 15 is a call disconnection section, and 16 is a disconnection sound transmission section.

In the first handset 1000-I, a 92Fi antenna,
82 is a power supply line, 72 is a wireless transmission/reception unit, 50 is a signal amplification unit, 51 is a call time control unit, 52 is a selection signal detection unit, 53
5 is an incoming call control unit, 54 is a call path control unit, 55 is a signal unit, and 5
6 is a signal amplification section, and 57 is a transmission control section. Second handset 1000-2, third handset 1000-3, ・---
-----------The m-th slave unit 1000-m also has a similar configuration to the first slave unit 1000-1.

Now, from the base phone 1-1 to the first handset 1000-1
Assume that you call

First, after lifting the handset of the base telephone 1-1 and confirming that a dial tone signal can be heard, the user dials the calling number of the first handset 1000-1. When the telephone exchange 2 determines that the number is that of the first handset 1000-1, the telephone exchange 2 sends the number to the first handset 1000-1 to the connection control unit 3.
A signal indicating that a call is being made, that is, a ground signal is sent out. Therefore, the connection control section 3 sends a signal for calling the first handset 1000-1 to the selective calling signal section 4, such as a ground signal.

Therefore, in the selective call signal section 4, the first handset 1000-
For example, a selective call signal of 800 Hz is transmitted for 1 second to make a selective call. This signal is amplified by the signal amplifying section 6 to an appropriate level, for example, OdBm, via the communication path control section 5, and then sent to the radio transmitting/receiving section 71. The wireless transmitter/receiver 71 transmits the selective call signal onto radio waves in the 59 MHz band, for example, and transmits it from the antenna 91 to the first to m-th slave units, 10 through the feeder line 81.
00-1.1000-2, -...-= 1000-
simultaneously transmit to m.

Each slave unit receives radio waves sent from the base unit. For example, in the first handset 1000-1, the radio waves are transmitted to the antenna 92.
and guide it to the wireless transmitter/receiver unit n via the feeder line 82,
The selective calling signal sent from the base unit is detected by demodulation.

The selective calling signal obtained by demodulation is amplified by a signal amplifying section 50 and sent to a selective signal detecting section 52 and a communication path control section. In this case, the incoming call control group sends the call route to telephone 1.
Since the control signal for connection to telephone 100-1 has not been received, the selective call signal sent to telephone line control section 54 is not sent to telephone 100-1, but is sent to selection signal detection section 52. If the selected selective paging signal indicates a call to the own station, the selective paging signal is passed through the selective signal detection section 52 and applied to the incoming call control section 53.

However, if the selective call signal indicates a call to another station, the selective call signal is detected by the selection signal detection unit 5.
2, and no signal is applied to the incoming call control unit. When a selective calling signal is applied to the incoming call control group, the incoming call control unit 53 instructs the signal unit 55 to send out a bell signal. Therefore, the signal section 55 transmits a bell signal, for example, 16Hz, to the telephone 100-1.
It sends out an AC signal.

In this case, the incoming call control group sends, for example, a ground signal to the communication path control unit 54. This ground signal instructs to form a communication path so that it is sent to the bell signal i telephone 100-1. It is something. When the ground signal is sent to the communication path control section 8, the transmission control section 5 is sent from the incoming call control section wing.
A ground signal is also sent to 7. This ground signal is used to instruct the start of transmission.
When the call is received by telephone 100-1, the bell of telephone 100-1 rings so that the telephone 100-1 knows that its own station is being called, picks up the handset, and answers. In response to the response from telephone 100-1, the communication path control section issues an instruction to the signal section to stop the bell signal. The bell signal stop signal is, for example, a ground signal. Upon receiving the ground signal, the signal section stops sending out the bell signal.

At the same time as receiving the instruction to stop the bell signal, the signal group sends a response signal to transmission control section 57 to notify the base unit that telephone 100-1 has responded. This response signal is, for example, a tone signal of 900 Hz for one second. The transmission control unit group sends this response signal to the wireless transmission/reception unit η, carries it on radio waves, and transmits it to the base unit via the feeder line 82 using an aerial image.

The main unit uses the antenna 91 to connect the first slave unit 1000-1.
receives radio waves from the wireless transmitter/receiver 71 via the power supply line 81.
and demodulates the response signal sent from the handset 1000-1 of No. 41. The response signal obtained by demodulation is amplified by a signal amplification section 10 and then detected by a response signal detection section 11. Therefore, the response signal detection unit 11 sends an instruction to the incoming call control unit 13 to the effect that the handset 1000-1 of Atsushi 1 has responded. This instruction signal is, for example, a ground signal. With this response, the incoming call control unit 1
In step 3, an instruction to form a communication path is sent to the connection control unit 3. This instruction can be given by, for example, a ground signal. As a result, the base phone 1-1 and the first handset 1
A communication path is formed between the telephone number 000-1 and the telephone 100-1, and in this state, communication between the two parties is possible.

The above explanation describes the operation of ψ1 when a telephone line is formed using a conventional star-shaped wireless network.

In the call time limited wireless communication system according to the present invention,
The first to sm children m 1000-1 to 1000-m are each equipped with a call time control unit 51, and at the same time as receiving radio waves from the base unit, all the slave units start their respective timers at the same time, and A handset that is not currently on a call, such as mm handset 1000, has started measuring time.
- Suppose that at tn, you pick up the handset of handset 100-m in order to start a conversation. In this case, since the first handset 1000-1 is busy on the wireless line, Naturally, I can hear the busy tone from m. However, the communication path control unit 54 of the m-th handset 100-m detects that the handset has been picked up and that the wireless line is being used by the handset at the current location. At the same time as the telephone number 9 is raised, a preset radio wave other than for telephone calls is automatically transmitted from the transmission control section 57 to the base unit for a short period of time. This signal is, for example, a 1000 Hz signal, and the period is, for example, 1 second.

The call request signal detection unit 12 of the base unit detects the notification radio wave from the handset only when the wireless line is busy, and at the same time as receiving this call request signal, the call time monitoring unit 14 is activated. After a set time has elapsed, for example, 5 minutes, the communication path is forcibly disconnected. In order to forcibly disconnect the call path, K sends a 5-minute elapsed signal, for example a ground signal, to the call disconnection section 15.

The call disconnection unit 15 gives a call activation signal, for example, a ground signal, to the disconnection sound transmitter 16.Therefore, after a preset time, for example 10 seconds, the call disconnection unit 15 sends the line to the connection control unit 3. A signal instructing disconnection, such as a grounding signal, is sent to forcibly disconnect the telephone line.

For a preset period of time, for example 10 seconds, until the forced disconnection starts, the disconnection sound transmitter 16 sends a disconnection warning sound, for example a tone signal of 1500 Hz, to the caller to notify the caller that the line will be disconnected. Foretell.

As explained above, according to the present invention, if there is no request for a call from a handset other than the handset currently in use, there is no limit to the call time; ! By restricting the call to end at a preset time when a request for a call is made from a handset other than the handset that is in use, the request for use of each handset is equally satisfied and the radio wave is This has the effect of being able to measure the effective use of.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the connection relationship between a base unit and a number of slave units in a call time limited type wireless communication system, and the configuration of the base unit and slave units. 1-1 to 1-n, 100-1 to l00-m-telephone 2... telephone exchange 3... connection control unit 4...
Selective call signal section 5...Call path control section 6...Signal amplification section 10...
・Signal amplification section 11...Response signal detection section 12...
- Desired call signal detection section 13... Incoming call control section 14... Call time monitoring section 15... Call disconnection section 16... Disconnection sound transmitting section 5
G... Signal amplification section 51... Call time control section 5
2...Selection signal generation unit 53...Incoming call control unit 54...Communication path control unit 5
5... Signal section 56... Signal amplification section 57.
...Transmission control unit 71, 72...No l! #jl transmitter/receiver section 81.82...
・Power supply part 91, dry...Antenna patent applicant NEC Corporation agent 9th Physician Inoro Sa1 Figure 1000-) ------,
fa-] 10 rabbits-m shi-1111--111-stomach

Claims (1)

[Claims] comprising one base unit and a plurality of slave units that share the one base unit, and using the same radio frequency between the base unit and one of the plurality of slave units; In a wireless communication system in which a communication path is formed by a wireless communication method, whether one of the plurality of other handsets newly wishes to make a call, regardless of the operation of the handset that is currently talking to the base unit. means for notifying the parent unit whether or not to make the call; and if there is a desire to make the call, a limit is placed on the call time of the slave unit that is currently on the call;
a second means for not applying the restriction when there is no desire to make the call;