JPH0286228A - Radio selective call equipment - Google Patents

Abstract

PURPOSE:To surely call a portable set by devising the system such that a mobile station calls the portable set if a call is received from a relay station while the portable set is removed from the mobile station. CONSTITUTION:Plural relay stations 10 are provided, which are installed in a radio zone of a control station 20, relays a signal from the control station 20 and calls a mobile station 30, the mobile station 30 is mounted on a vehicle or the like and calls the portable set 40 when a call is given from the relay station while the removable portable set 40 is removed. When the portable set 40 is removed from the mobile station 30, since the mobile station 30 calls the portable set 40, the received electric field level is increased normally by several dB more than the case with the relay station 30 calling directly the portable set 40 thereby surely calling the portable set 40.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a radio selective calling device for calling a portable device removably installed in a mobile station using a multi-channel access (MCA) method or the like.

2. Description of the Related Art In general, in this type of wireless selective calling device, a mobile station is installed in a vehicle or the like, and a portable device is removed from the mobile station and used when a user such as a driver leaves the vehicle or the like.

Conventionally, in this type of wireless selective calling device, when the portable device is removed from the mobile station, the relay station directly transmits a selective calling signal to the portable device, and the portable device connects to the antenna hidden inside the case. The relay station is configured to directly receive and call a selective call signal from a relay station.

Problems to be Solved by the Invention However, in the conventional radio selective calling device described above, the gain is low because the antenna of the portable device is built into the housing.
Furthermore, if the mobile device is located inside a building, it will be unable to receive the radio signal from the relay station due to large attenuation due to radio wave propagation. There is a problem that the user cannot be called.

SUMMARY OF THE INVENTION In view of the above conventional problems, it is an object of the present invention to provide a wireless selective calling device that can reliably call a portable device.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a system in which the mobile station calls the mobile device when the mobile station receives a calling charge from the relay station when the mobile device is removed from the mobile station. This is how it was done.

Effect of the Invention According to the above-described configuration, when the mobile station is mounted on a vehicle, the user carrying the portable device has a short distance from the vehicle, so that the user can reliably call the portable device.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of the wireless selective calling device according to the present invention, FIG. 2 is a block diagram showing the detailed configuration of the wireless selective calling device of FIG. 1, and FIG. FIG. 2 is an explanatory diagram of the operation of the wireless selective calling device of FIG. 1;

In FIG. 1, a plurality of mobile stations 10 are installed in the wireless zone of the command station 20 and relay signals from the command station 20 to the mobile stations 30.
The mobile station 30 is installed in a vehicle or the like, and when receiving a call from the relay station when the removable portable device 40 is removed, the mobile station 30 is a relay station that calls the mobile device 40 as described later. configured to call.

In FIG. 2, the relay station 10 includes a receiver (RXo) 1 that receives and transmits radio signals of the control channel Pch, respectively.
), a transmitter (TXo) l 2, a controller (CONT) 13 that controls the entire relay station 10 as described later, and a receiver (that receives and transmits radio signals of communication channels 5ch1 to Schn), respectively. RX1~RXn)141~
14n, a transmitter (TX+ to TXyl>15+ to 15n), a receiving antenna 16, a transmitting antenna 17, and the like.

The command station 20 includes an antenna 21 for transmitting and receiving wireless signals to and from the relay station 10, a receiver (RX) 22 for receiving and transmitting wireless signals to and from the relay station IO via the antenna 20, A transmitter (TX) 23 and this receiver (R
A useless frequency synthesizer (SINTH) that uses the X) 22 and transmitter (TX) 23 as an MCA transceiver.
24, a controller (CONT) 25 that controls the entire relay station 10 as described later, and a speaker (SP) 2 for communication.
6, a microphone (MIC) 27, and an operating vehicle 28 for selectively calling mobile stations 30 in groups or individually, commanding data collection from the mobile stations 30, and the like.

The mobile station 30 includes an antenna 31 and an antenna 3 for transmitting and receiving radio signal 12 between the relay station 10 and the portable device 40.
1, a receiver (RX) 32 and a transmitter (TX) 33 that receive and transmit wireless signals between the relay station 10 and the portable device 40, respectively, and the receiver (RX) 32 and the transmitter (T
A frequency 7 synthesizer (SINTH) 34 that uses the X) 33 as an MCA transmitter/receiver, a controller 35 that controls the entire mobile station 30 as described later, a speaker (SP) 36 for telephone calls, and a microphone (MIC). ) 37, a recorder (REC) 38 for recording a message indicating that the mobile phone R40 has been removed, a connector 39 for removably connecting the mobile phone 40, and the like.

The portable device 40 has an antenna 41 for receiving radio signals from the mobile station 30, and a radio signal from the mobile station 30 via the antenna 41.
A receiver (RX) 42 that receives a radio signal from a receiver (RX) 42, a frequency synthesizer (SINTH) 43 that uses the receiver (RX) 42 as an MCA transmitter/receiver, and an audio synthesizer that is equipped with an intermediate frequency amplifier, a detector, etc. Receiving circuit (CALL
) 44, a speaker 45 for receiving calls, a battery (BAT) 46 for power supply, and a connector 47 that connects to the connector 39 of the mobile station 30.

Next, the operation of the above embodiment will be explained with reference to FIG.

FIG. 3A shows the operation when the portable device 40 is connected to the mobile station 30. When the command station 20 accesses the control channel Pch, the relay station 10
hk and send this communication channel 5Chk to the command station 20.
is instructed to the mobile station 30.

When the command station 20 transmits the individual selective calling signal a via this communication channel 5chk, the relay station 10 relays and transmits this individual selective calling signal a, and the mobile station 30 receives this individual selective calling signal a. , the speaker 36 makes a ringing tone C sound.

When the mobile station 30 operates a response switch (not shown), it transmits a plurality of response signals and stops ringing the ring tone C, and the relay station 10 relays this response signal and issues a command. station 20.

Therefore, by this operation, the command station 10 and the mobile station 30
It is possible to make calls between.

FIG. 3B shows the operation when the portable device 40 is removed from the mobile station 30, and the individual calling operation shown in FIG. 3AK is omitted from the illustration.

In FIG. 3B, when the mobile station 40 is removed from the mobile station 30, it starts a reception operation that sequentially switches communication channels 5ch1 to 5chn.

In this case, the mobile station 40 sets, for example, the number n of communication channels to 15J, and each communication channel Sch has 10 m
Receive all communication channels during 150m5 as 5, 3
The reception is paused for 00 ms and the reception operation is repeated.

On the other hand, when the mobile station 30 receives the individual selection paging signal a when the portable device 40 is removed, the mobile station 30 puts the recorder 38 into playback mode and sends a message to the relay station IO to the effect that the portable device 40 has been removed. At the same time, it transmits to the mobile station 40 a response signal to which the selective calling signal of the own station is added for a predetermined period of time. In addition, mobile 30
In this case, a lamp indicating that a call has been received may be turned on or blinked.

In this case, the mobile station 30 transmits a signal for example 0 times.
1 second, the number of communication channels is n is J, and if the signal is transmitted twice or three times, the total signal transmission time is 3.
seconds or 45 seconds. In addition, when transmitting using a tone selection signal, the tone selection signal is continuously transmitted for a maximum of 45 seconds (=03 episodes x 15 channels).

When the portable device 40 receives the carrier from the mobile station 30, it fixes to that communication channel, and when the received selective calling signal and its own selective calling signal match, it makes the speaker 45 ring to generate a ringing tone.

Therefore, according to the above embodiment, when the portable device 40 is removed from the mobile station 30, the mobile station 30 calls the portable device 40, so that the relay station 30 directly calls the portable device as in the conventional case. The received electric field level is usually several tens of dB higher than when calling the mobile device 40, and the portable device 40 can be called with certainty.

The user called by the portable device 40 can then return to the mobile station 30 and talk to the command station 20.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention allows the mobile station to call the mobile device when receiving a call from the relay station when the mobile device is removed from the mobile station. When mounted on a heavy vehicle, the user carrying the portable device has a short distance from the vehicle, so the portable device can be reliably called.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a wireless selective calling device according to the present invention, FIG. 2 is a block diagram showing a detailed configuration of the wireless selective calling device of FIG. 1, and FIG. 2 is an explanatory diagram of the operation of the wireless selective calling device of FIG. 1. FIG. IO...Relay station, 20...Command station, 30...Mobile station, 40...Mobile device.

Claims (4)

[Claims] (1) A relay station that relays a paging signal from a command station to call a mobile station; and a portable device that is removably provided in the mobile station; A wireless selective calling device, characterized in that when receiving a call from the relay station, the portable device is called by a wireless signal. (2) The wireless selective calling device according to claim 1, wherein the command station, relay station, mobile station, and portable device each perform wireless communication using a multi-channel access method. (3) Claim (1) or (2) characterized in that the mobile station continuously transmits a paging signal when receiving a paging from the relay station when the portable device is removed.
) wireless selective calling device. (4) The mobile station according to any one of claims (1) to (3), further comprising means for notifying when the mobile station receives a call from the relay station when the portable device is removed. Wireless selective calling device as described.