JP2946670B2 - Radio selective call receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective call receiver, and more particularly, to a radio selective call receiver suitable for performing paging.

[Related Art] In recent years, a radio selective calling receiver (hereinafter, referred to as a receiver).
As devices become smaller year by year and their portability improves, various methods of using such receivers are being considered, and methods of calling a plurality of people at once are also being considered.

In this case, it is possible for each person to carry a plurality of receivers registered with different ID numbers, and to call a large number of people at once by a single call called a group call.

[Problem to be Solved] In the above-mentioned conventional radio selective calling receiver, if it is assumed that a group call is mainly performed and a plurality of receivers are registered with different ID numbers, the effective use of radio waves is reduced. I can't.

The present invention has been made in view of the above problems, and is preferably used mainly when performing a group call,
It is an object of the present invention to provide a radio selective calling receiver capable of effectively utilizing radio waves.

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object, the invention according to the first claim is directed to receiving a radio selective calling signal transmitted at a first radio frequency, and identifying an ID represented by the signal in advance. Registered self
Receiving means for notifying the holder when the ID matches,
Transmitting means for transmitting a group ID signal at a second radio frequency from a transmitting antenna; and transmitting the group ID signal when the radio selective calling signal transmitted at the first radio frequency includes a group ID transmission request. A parent receiver having control means for transmitting a signal, and a group ID of the own receiver, which receives a group ID signal transmitted at the second radio frequency, and in which a group ID represented by the signal is registered in advance. And a sub receiver for notifying the holder when it matches.

According to a second aspect of the present invention, in the radio selective calling receiver according to the first aspect, the radio selective calling signal has a message area, and the control means transmits a group ID included in the message area. The transmission unit includes a detection unit that detects a request, and a transmission control unit that causes the transmission unit to transmit a group ID signal when the detection unit detects a group ID transmission request.

[Operation] In the invention according to claim 1 configured as described above, the parent receiver receives the radio selective calling signal transmitted at the first radio frequency by the receiving means and is represented by the same signal. When the ID matches the self-registered ID in advance, the holder is notified and the control means performs the first
In the case where the group ID transmission request is included in the radio selective calling signal transmitted at the radio frequency, the transmitting means causes the transmitting antenna to transmit the group ID signal at the second radio frequency. Then, the slave receiver receives the group ID signal transmitted at the second radio frequency, and notifies the holder when the group ID represented by the signal matches the self-registered group ID in advance. Let me know.

In the invention according to claim 2 configured as described above, when the detection unit in the control unit detects a group ID transmission request included in the message area of the radio selective calling signal, the transmission control unit transmits a group ID from the transmission unit. Send ID signal.

That is, the parent receiver which is the core of the group is called by a normal radio selective calling signal, and a request for performing a paging call is transmitted to the receiver, and the parent receivers receiving the request individually control the child receivers. I'm trying to call. Therefore, even when a group call is made, there is no need to assign the ID of the radio selective calling signal to each of the receivers receiving the general call.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a radio selective calling receiver according to one embodiment of the present invention.

In the figure, reference numeral 10 denotes a transmitting station, and a transmitting station antenna 11
Then, a selective calling signal S1 to each wireless selective calling receiver 20 is transmitted.

The radio selective calling receiver 20 basically includes a parent receiving unit 22 connected to a parent receiver antenna 21 and a parent receiving unit 22.
, A decoder 23 for transcoding the demodulated and waveform-shaped signal, a ROM 24 for storing the ID number, and a parent reception of the message by the control signal of the decoder 23 when the received ID number matches the own ID number. It has a main receiver driving unit 26 that performs notification such as displaying on the device display unit 25. Also,
The radio selective calling receiver 20 also has a function of a parent receiver for the child receivers 30a to 30c, and stores a control CPU 26 and a message input via the CPU 26 in order to perform the function. And a transmission unit 29 for transmitting a group call signal to the child receiver 30 via the transmission antenna 28 under the control of the CPU 26. 26a is a switch for designating whether or not to make a group call.

Child receivers 30a to 3 that receive group calls from the parent receiver
0c has a configuration similar to the basic configuration of the parent receiver 20, and includes a child receiver 32 connected to a child receiver antenna 31 for receiving a group call signal S2 from the parent receiver 20, and a child receiver 32. A child receiver decoder 33 that performs code conversion on a signal received, demodulated and shaped by the receiver 32, a group ID_ROM 34 that stores a group ID number, a reception group ID number and its own group.
It has a child receiver driving unit 36 that performs notification from the child receiver notification unit 35 by a control signal of the child receiver decoder 33 when the ID number matches.

 Next, the operation of the present embodiment having the above configuration will be described.

When receiving a request to transmit a selective calling signal via a telephone line, transmitting station 10 transmits a selective calling signal S1 for calling a predetermined ID from transmitting station antenna 11.

Each radio selective calling receiver 20, which is a parent receiver, has a transmitting station 10
2 is received by the parent receiving antenna 21 and the parent receiving section 22 demodulates the signal S1 and shapes the waveform to obtain the digital signal shown in FIG. 2 (a).

The digital signal is input to a decoder 23, and the decoder 23 synchronizes bits with a 62-bit “1” and “0” repetition pattern P. After the repetition pattern P, a 32-bit frame synchronization signal SC is transmitted. When the decoder 23 detects the frame synchronization signal SC, the decoder 23 compares the subsequent address signal A with its own ID number written in the ROM 24. The comparison is performed for each bit.

As a result of the comparison, if the decoder 23 confirms that they match, it activates the CPU 26 to execute subsequent decoding of the message signals M1 to Mn, and the decoder 23 enters a state of waiting for the stop signal E.

Each signal of the frame synchronization signal SC, the address signal A, the message signals M1 to Mn, and the stop signal E is composed of BCH (31, 21) + parity code as shown in FIG.
The frame synchronization signal SC and the stop signal E are fixed patterns, and the address signal A and the message signal M are SCH (31, 21).
The MSB of the + parity information area is used as an identification bit, and is processed as an address signal when the identification bit is "0" and as a message signal when it is "1".

Here, the message signal Mn is provided with a group ID transmission bit following the identification bit, and the group ID transmission bit is “0” indicating that the group ID signal G_ID is not transmitted, and “1”. The time indicates that the group ID signal G_ID is transmitted. Therefore, according to the value of the group ID transmission bit in the message signal Mn, the CPU 26 transmits the group ID signal G_ID to the transmission unit 29 when the bit is “1”. The message signal uses a standard code of ISO 7 bits, and the message signal M is configured by sequentially filling each BCH (31, 21) + parity information area 20 bits.

When the group ID signal G_ID is input from the CPU 26, the transmitting unit 29 modulates the signal G_ID, amplifies the signal G_ID, and
Sent from 28. The transmitted group call signal S2 is a weak radio wave that does not need to be recorded in accordance with the Radio Law, and is of such a degree that the small receiver antenna 31 of the plurality of small receivers 30 near the parent receiver 20 can receive the signal. It has become.

In the child receiver 30, the same group calling signal S2 is received by the child receiver antenna 31, and demodulated and shaped by the child receiving unit 32.
After the waveform shaping, the slave receiver decoder 33 compares the data with the data in the group ID_ROM 34. If the data matches, the slave receiver driving unit 36 drives the slave receiver notification unit 35 by judging that the calling is called.

As described above, a plurality of child receiver holders can be called simultaneously.

On the other hand, in the parent receiver 20, when the stop signal E indicating the end of the message signal M is detected, the decoder 23 drives the parent receiver notification unit 25 via the parent receiver driving unit 26, and the parent receiver Inform the person that the call was made. At this time, the CPU 26 sends the contents of the call to the RAM 27 to temporarily store the contents.

However, if the parent receiver holder has turned on the switch 26a when receiving the selective calling signal S1, the CPU 26 sends the group ID to the transmitting unit 29 even if the group ID transmission bit is "1".
The transmission unit 29 does not transmit the signal G_ID and does not transmit the group call signal S2. For this reason, when the child receiver is not used, by turning on the switch 26a, power saving of the parent receiver 20 can be achieved.

Specifically, in group activities such as school excursions, a group leader carries a parent receiver and a group member carries a child receiver. During group action, if there is a group member carrying a child receiver within several hundred meters of the leader, calling only the leader will send a call signal to that group member, and if the group members gather at the leader, call You can also check the contents of the message.

On the other hand, if the receiver becomes larger, some holders may separate the receiver from their bodies and put them in a bag or the like, and the receiver may not fulfill its original purpose of calling the holder. However, if a parent receiver and a child receiver are used one by one, and the parent receiver is put in a bag and the child receiver is worn, it can be confirmed that there is a call. At the same time, the contents of the call can be confirmed later by the parent receiver, which leads to improvement in portability.

[Effect of the Invention] As described above, the present invention sends a call signal to a parent receiver having a transmission function among a plurality of receivers, and the called parent receiver is different from the signal called by itself. A pre-registered calling signal is issued by a signal with a weak frequency, and it can be known that a plurality of child receivers in the vicinity of the user have called. At this time, it is necessary to register the group ID in the child receiver, but it is not necessary for each of the child receivers to perform ID registration. Machine can be provided.

By the way, various types of receivers are prepared, from a model only for calling to a model having various additional functions such as a message display function, and the size of a model only for calling is easier to reduce in size. Since the secondary receiver does not require additional functions such as a display function, it can be miniaturized to improve portability, and even a person who is not accustomed to holding the receiver can carry it without any discomfort.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a relay system of a radio selective calling receiver according to an embodiment of the present invention, FIG. 2 is a format diagram of a radio selective calling signal, and FIG. 3 is a format diagram of an address signal and a message signal. is there. 20: Parent receiver, 23: Decoder, 26: CPU, 27: R
AM, 29: Transmitter, 30: Child receiver, S2: Group call signal, G_ID: Group ID.

Claims (2)

(57) [Claims] 1. Receiving means for receiving a radio selective calling signal transmitted at a first radio frequency and notifying a holder when an ID represented by the signal matches a pre-registered own ID. Transmitting means for transmitting a group ID signal at a second radio frequency from a transmitting antenna; and transmitting the group ID signal when the radio selective calling signal transmitted at the first radio frequency includes a group ID transmission request. A master receiver having control means for transmitting a group ID signal; and a self-registered receiver in which a group ID represented by the group ID signal received by receiving the group ID signal transmitted at the second radio frequency is registered. And a child receiver for notifying the holder when the ID matches the group ID. 2. The radio selective call receiver according to claim 1, wherein the radio selective call signal has a message area, and the control means detects a group ID transmission request included in the message area. And a transmission control unit for transmitting a group ID signal from the transmission unit when a group ID transmission request is detected by the detection unit.