JPH04165826A - Radio calling system - Google Patents

Abstract

PURPOSE:To surely recognize whether oneself is inside a radio wave arriving distance area from an own station transmitter by transmitting the identification number of an opposite station and an arriving distance confirming signal from the transmitter, and normally discriminating whether this identification number and the confirming number are received in a receiver. CONSTITUTION:An encoder 140 encodes the arriving distance confirming signal and the identification number of the opposite station, prepares a second encoded signal, and supplies this to a transmitting circuit 150 then transmits. On the other hand, A receiver 200 decodes these encoded signals by a decoder 220, then, first, takes out the identification number of the opposite station, and applies to a comparing circuit 230. The comparator circuit 230 compaires the identification number with the identification number of the own station. If the both identification numbers coincide, the comparator circuit 230 calls out an output and opens a gate. Therefore, when the second encoded signal is received, an arriving distance confirmation display circuit 250 is operated, and it is displayed by a sound, light, and the like that the receiver 200 is inside the radio wave arriving distance area from a transmitter 100.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention makes it possible to constantly confirm whether the receiver is within the range of radio waves from the transmitter or has left it. Regarding wireless systems.

(Prior Art) Wide area pagers are well known as wireless paging systems. In this system, the service area is clearly specified by the telecommunications carrier, so the person holding the receiver can easily identify whether he or she is within the service area or outside the service area. Additionally, since the radio waves received by the receiver are usually calling radio waves from a base station, the receiver must be within a range where the calling radio wave strength is at least at a level that allows the receiver to decipher the calling radio waves. If there is a call, you will always be able to receive the call radio wave. Therefore, whether or not you are within the service area can be determined only from the strength of the received radio waves.

In known private radio paging systems, one frequency is shared by a large number of users, and the time for one transmission is limited to prevent radio waves from being monopolized. Therefore, in this system, if the calling signal strength is used as a guideline for determining whether or not it is possible to receive a calling signal, it is important to note that if the calling signal strength is used as a guideline for determining whether or not it is possible to receive a calling signal, it is necessary to If you are within the range of the calling radio waves from another station's transmitter, even though you are outside the range of the calling radio waves from your own station's transmitter, you will be within the range of the calling radio waves of your own station's transmitter. The drawback is that it assumes that you are inside.

A radio calling system is also known in which an operator of a vehicle-mounted radio carries a receiver when leaving the vehicle, and when the radio receives a calling radio wave, activates the receiver to notify the call. In this system, the call output is small and the antenna is installed at a height of 1.5 m at most, so it is difficult to determine how far the radio waves from the radio can reach from the vehicle under various environmental conditions. The problem was that it was impossible to know. For this reason, it was necessary to miss the fact that a call was received, or to return to the vehicle each time to check whether there was a call or not.

(Problems to be Solved by the Invention) This invention was made to solve these problems, and is a wireless radio that constantly displays on the receiver whether or not it is within the reach of the calling radio waves from the transmitter. The purpose is to provide a calling system.

(Means for Solving Problem 11) In order to achieve the above object, the wireless paging system of the present invention generates a paging signal at the time of paging and also generates a range confirmation signal at a first time interval, and a transmitter that transmits a combination of a calling signal or the range confirmation signal and a partner station identification number; and a transmitter that receives radio waves from the transmitter and extracts the partner station identification number, the call signal, and the range confirmation signal. When the retrieved partner station identification number and own station identification number match, the calling signal activates the calling display circuit, the reachable distance confirmation signal activates the reachable distance confirmation display circuit, and the first and a receiver that notifies that the range confirmation signal is not received over a second time interval that is longer than the time interval.

(Operation) The transmitter transmits a signal that combines a calling signal and a partner station identification number when calling, and also transmits a signal that combines a range confirmation signal and a partner station identification number at a first time interval.

The receiver extracts the partner station identification number, the calling signal, and the range confirmation signal, and when the retrieved partner station identification number and the own station identification number match, the receiver uses the calling signal to activate the calling display circuit to confirm the range. The signal activates the distance confirmation display circuit and notifies that the distance confirmation signal is not received for a second time interval that is longer than the first time interval.

(Embodiment) Hereinafter, an embodiment of the wireless paging system according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a transmitter in this radio paging system, and FIG. 2 is a block diagram showing the configuration of a receiver in this radio paging system.

In the transmitter 100 of FIG. 1, a call switch 110 that is activated during a call is connected to a call control circuit 120 that includes a call signal generation circuit. The output of the call control circuit 120 and the output of the partner station identification number storage circuit 130 that stores the identification number of the partner station to be called are connected to one input of the encoder 140.
The output of 0 is connected to the input of transmitter circuit 150. The output of the range confirmation signal generation circuit 160 is connected to the other input of the encoder 140.

Next, in the receiver 200 shown in FIG.
The first output of the decoder 220 is connected to one input of the comparison circuit 230. The other input of the comparison circuit 230 is connected to a local station identification number storage circuit 240 that stores the local station identification number. Decoder 220
The second output of the decoder 220 is connected to the call indicator circuit 250 through a gate controlled by the output of the comparison circuit 230, and the third output of the decoder 220 is connected to the call indication circuit 250 through a gate controlled by the output of the comparison circuit 230. It is connected to the reach distance identification display circuit 260.

Next, the operation of the wireless paging system according to this embodiment will be explained with reference to FIGS. 1 and 2. When making a call, the call switch 110 is first activated. The operation of the call switch 110 is performed by the call control circuit 1.
20 and activates a paging signal generating circuit therein to supply a paging signal to encoder 140. Therefore, the encoder 140 reads out the identification number of the other station from the other station identification number storage circuit 130, encodes the identification number of the other station and the calling signal to create a first encoded signal, and sends this to the transmission circuit 150. Supply and send.

The range confirmation signal generation circuit 160 generates a range confirmation signal at regular time intervals even when no call is made, and supplies it to the encoder 140. Therefore, the encoder 140 encodes the range confirmation signal and the identification number of the partner station to create a second encoded signal, which is sent to the transmitting circuit 15.
0 and send it.

Note that when the calling signal and the reaching distance confirmation signal occur at the same time, the calling signal is given priority.

On the other hand, in the receiver 200, a receiving circuit 210 detects the calling radio wave from the transmitter 100, extracts a first encoded signal or a second encoded signal, and provides these encoded signals to a decoder 220. Therefore, the decoder 220 decodes these encoded signals, first extracts the identification number of the partner station, and provides it to the comparison circuit 230. The comparison circuit 230 compares the given identification number of the other station with the identification number of the own station from the own station identification number storage circuit 230.

As a result of the comparison, if the two identification numbers do not match, it means that you have not been called, and no further action is taken. When both identification numbers match, the comparator circuit 230 generates an output and opens the gate. Therefore, when the first coded signal is being received, a call signal is extracted and the call display circuit 240 is activated to notify the call with sound, light, etc., and when the second coded signal is received, When the range confirmation signal is taken out, the range confirmation display circuit 250 is activated, and indicates by sound, light, etc. that the receiver 200 is within the radio wave range from the transmitter 100.

Furthermore, even if the range confirmation signal is not received for a predetermined period of time or more, the range confirmation display circuit 250 operates to notify that the receiver 200 is outside the radio wave range of the transmitter 100.

Note that the above explanation is for one-to-one calling, but
The invention can also be applied to one-to-many paging systems such as local pagers.

In this case, a plurality of identification numbers may be stored in the identification number storage circuit 130, and a selection switch for selecting a plurality of calling parties may be used instead of the calling switch 110. It is also possible to operate the call control circuit 120 by the output of a wireless device with a calling function or a wireless device anti-theft device, thereby providing a wireless calling system in which the receiver 200 is carried by the operator.

(Effects of the Invention) As can be understood from the above detailed explanation of the present invention with reference to embodiments, the transmitter transmits the identification number of the partner station and the range confirmation signal, and the receiver transmits the identification number and range confirmation signal. Since it constantly determines whether the identification number and range confirmation signal are received, you can reliably recognize whether you are within the range of radio waves from your own transmitter or not. The reliability of the wireless paging system can be increased.

Furthermore, if the range confirmation signal cannot be received even though the radio range is within the radio range from the transmitter, it can be assumed that an abnormality has occurred in the transmitter or receiver. It can also contribute to discovering abnormalities in the equipment and receiver.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a transmitter used in an embodiment of the radio paging system according to the present invention, and FIG. 2 is a block diagram showing the configuration of a receiver used in an embodiment of the radio paging system according to the present invention. FIG. 2 is a block diagram showing the configuration. 110: Call switch, 120: Call control circuit, 130: Partner station identification number storage circuit, 140: Encoder, 150: Transmission circuit, 160: Range confirmation signal generation circuit, 210: Receiving circuit, 220: Decoder, 230: Self Station identification number storage circuit, 240. Call display circuit, 250/reaching distance identification display circuit.

Claims (1)

[Claims] 1. When calling, a calling signal is generated and a range confirmation signal is also generated at a first time interval, and a combination of the calling signal or the range confirmation signal and a partner station identification number is transmitted. a transmitter; receiving radio waves from the transmitter and receiving the partner station identification number;
When the calling signal and the reaching distance confirmation signal are extracted, and the partner station identification number and the own station identification number match, a calling display circuit is activated by the calling signal, and a reaching distance confirmation display circuit is activated by the reaching distance confirmation signal. and a receiver that notifies that a range confirmation signal is not received over a second time interval that is longer than the first time interval. 2. A calling circuit that operates to generate a calling signal when a call is made; a memory circuit that stores a partner station identification number; a range confirmation signal generating circuit that generates a range confirmation signal at predetermined time intervals; and the calling signal. 2. The transmitter for use in a radio paging system according to claim 1, further comprising a transmitting circuit that transmits a combination of the range confirmation signal and the partner station identification number. 3. A decoding circuit that receives radio waves from the transmitter and extracts the partner station identification number, the calling signal, and the range confirmation signal, and compares the retrieved partner station identification number with the own station identification number. , a comparison circuit that generates an output when both identification numbers match; a call indicator circuit that is activated by the call signal in response to the output of the comparison circuit; 2. The receiver for use in a radio calling system according to claim 1, further comprising a range confirmation display circuit activated by a range confirmation signal.