JPH05115083A - Radio communication system - Google Patents

Abstract

PURPOSE:To simplify the system configuration and to ensure the calling with respect to the radio communication system calling a portable calling device. CONSTITUTION:In the radio communication system provided with a 1st radio station 1, a 2nd radio station 2 and a portable calling device 3 replying a call from any of the 1st and 2nd radio stations, the 1st radio station 1 is provided with a transmission means 4 sending a selection signal for the 2nd radio station 2 and the 2nd radio station 2 is provided with a transmission means 5 receiving the selection signal and sending an acknowledge signal to the 1st radio station, a timer means 6 measuring the time till the start of transmission of a speech signal after the reception of the selection signal and a transmission control means 7 sending a call signal to operate the portable calling device when the time exceeds a prescribed time or over.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial wireless communication system, and more particularly to a wireless communication system in which a communication request from a first wireless station to a second wireless station is notified by a portable calling device (commonly called a pager). ..

[0002]

2. Description of the Related Art Wireless communication for business use is a radio wave shared use system, and is 150M for general business communication of various private companies.
Hz band, 400MHz band, 800MHz band are used,
It has spread nationwide in fields such as transportation, sales, and construction.

As an example, FIG. 7 shows an MCA system (multi-channel access) using the 800 MHz band. The MCA system includes a command station 21 and a mobile station 23,
Further, it is composed of a control station 22 for controlling communication between the command station and the mobile station. Generally, a command station 21 and a plurality of mobile stations 2
3 constitutes one group as a unit of subscription. A unique group number or the like is given to each group, and a station ID number for identifying each station is given to each station as communication information.
For example, 399 waves are allocated to the control station and the command station / mobile station as the entire MCA system, and the entire frequency is further divided into 25 blocks, and the system is configured with one channel for control and 15 channels for communication as one unit. ing.

For example, when the command station 21 makes a communication request to the mobile station 23, the command station 21 first transmits a communication request signal (not shown) to the control station 22 through the control channel, and the control station 22 which receives this signal requests the communication request signal. One speech channel is designated for the command station 21 and the mobile station 23 by the speak channel. Then, the command station 21 and the mobile station 23 move to the designated communication channel according to this channel signal. However, when the available call channel is full during the time when the use is concentrated, the control station 22 waits for an empty channel and sets the "reserved state" until the call channel becomes empty until the call channel becomes available.
23. Wait for communication. .

When the communication channel is formed, the mobile station 23
First sends a call permission signal (not shown) to command station 21, and command station 21 responding to this sends a selection signal to mobile station 23. Next, the mobile station 23 sends back a confirmation signal to the command station 21 at the same time as receiving this selection signal. When the command station 21 receives this confirmation signal, the response lamp lights up on the operation unit of the command station. These communications are performed at the rated transmission output (10 W or less).

When the selection signal is received by the mobile station 23 in the above, a ringing sound sounds at the operation unit of the radio unit 24 of the mobile station 23 and the station number called at the same time, that is, the station number of the command station is displayed. .. Further, this number is stored in the radio device 24. As a result, the operator can operate the press talk of the wireless device 24 to talk with the command station 21. However, when the operator is away from the mobile station 23 and cannot hear the ringing sound, the operator cannot answer the call and the command station cannot talk to the mobile station.

For this reason, conventionally, a portable calling device calling device 81 is provided separately from the radio device 24 of the mobile station, and another radio wave is transmitted from the antenna 82 of the calling device 81 and received by the portable calling device 83. By so doing, a calling method has been adopted in which the operator is notified of the communication request from the command station 21.

[0008]

However, such a conventional paging system for a portable paging device requires a transfer paging device separate from the mobile station radio, and is different from the commercial radio frequency band. There is a drawback that it is necessary to separately install an antenna for transfer call in order to transmit radio waves in the frequency band.

Further, since the conventional method uses weak electric waves of low power type, the reaching distance of the electric waves is short, and when the operator is in a building or in a place where the electric wave conditions are bad such as in the shade of the building. It has the drawback of not receiving radio waves.

Further, according to the conventional method, since the calling can be uncertain when the operator is away from the radio and the calling sound cannot be heard as described above, the command station, for example, can be repeatedly used to communicate with the mobile station. Also calls the mobile station, and there is a drawback such as inefficient use of commercial radio waves, especially during times when communication usage is concentrated.

Therefore, an object of the present invention is to simplify the device for calling the portable calling device, to ensure the calling of the operator away from the wireless station, and to efficiently use the radio waves for business use. (EN) Provided is a wireless communication system having a calling function of a calling device.

[0012]

Means for achieving the above object are shown in FIG. In a wireless communication system including first and second wireless stations 1 and 2, and a portable calling device 3 that responds to a call from either the first or second wireless station, the first wireless station 1 is The second wireless station 2 includes a sending unit 4 for sending a selection signal of the second wireless station 2, and the second wireless station 2 receives the selection signal and sends a confirmation signal to the first wireless station, and a selection signal. A timer means 6 for measuring the time until the start of transmission of the call signal after receiving the call signal and a sending control means 7 for sending a calling signal for operating the portable calling device when the time is longer than a predetermined time.

[0013]

According to the above-mentioned means, the portable paging device 3 receives the paging signal from the second wireless station 2 so that the second paging signal can be obtained.
It can be seen that the operator of the wireless station is not answering the call from the first wireless station 1.

[0014]

FIG. 2 shows an embodiment according to the present invention. FIG. 2 is a diagram in which the present invention is applied to an MCA system, where 21 is a command station, 22 is a control station, and 23 is a mobile station. Mobile station 23
The wireless device 24 is provided with a call judging device 25, and the mobile station 23 is provided with a portable calling device 26 corresponding to the call judging device 25.

FIG. 3 is a circuit block diagram of the radio unit 24 and the call judging device 25 of the mobile station 23. When a selection signal is transmitted from the command station in the wireless device 24, the selection signal is captured by the antenna 31 of the wireless device 24 and sent to the receiving circuit 32. Here, after frequency conversion and signal amplification, it is input to the demodulation circuit 33. The selection signal is FS in the demodulation circuit 33.
The K signal is demodulated and input to the CPU 34.

Communication information, such as a group number and a station ID number, of the FSK signal input to the CPU 34 is detected and compared with the communication information in the storage circuit 35. When the CPU 34 determines that they are suitable, it sends a confirmation signal to the command station via the modulation circuit 36 and the transmission circuit 37. Furthermore, C
The PU 34 controls the oscillator frequencies of the receiving circuit 32 and the transmitting circuit 37 through the signal lines 38 and 39, inputs of a press talk signal, and the like.

The call determination device 25 is connected to the data communication external terminal 40 of the radio device 24 and is provided outside the radio device 24 as an adapter. The call judging device 25
S-232C serial transmission enables the CPU 34 of the wireless device.
A communication means 41 and a communication means 4 that enable mutual communication with
Discrimination of the signal in the CPU 34 sent via 1 and C
A CPU 42 for issuing a call signal transmission command to the PU 34 is provided, and these are configured by a one-chip microcomputer. Furthermore, the call determination device 25 uses the call ID provided in the call signal.
A ROM 43 for storing a number and a call ON / OFF switch 44 are provided when the call function of a portable caller is not required.

FIG. 4 shows a circuit block diagram of the portable calling device 26 according to the present invention. Receiver circuit 50 of portable calling device 26
Is similar to the receiving circuit 32 of the wireless device 24. The radio signal in the 900 MHz transmission frequency band captured by the antenna 51 is amplified by the high frequency amplifier circuit 52. Next, the double super-heterodyne detection circuit 53-56 converts the frequency in two steps to an intermediate frequency. At this time, the ringing signal radio wave having a different frequency for each channel to be transmitted is detected by sequentially scanning the frequency of the frequency synthesizer 54. Further, the calling signal is an intermediate frequency amplifier circuit 5.
The FSK signal, which is amplified by 7 and then digitized by the demodulation circuit 58, is input to the CPU 59.

The FSK signal output from the demodulation circuit 58 forms a series of signal trains, and is initially "1" and "0".
FSK carrier signals in which and are alternately long and continuous,
Next, communication signals such as a bit synchronization signal, a group number, and a station ID number are arranged, and a vacant space thereafter is provided with a call ID number as call information.

In order to call the portable calling device from the mobile station, both the mobile station and the portable calling device share the same preset calling ID number, and the ROM 60 connected to the CPU 59.
Stores the same call number as the ROM 43 of the call determining device. The CPU 59 displays the call ID from the signal string of the call signal.
The number is detected and it is determined whether or not the number matches the number in the ROM 60. If they match, the CPU 59 outputs a notification signal to the notification circuit 61, and the notification signal is amplified by the amplification circuit 62 to cause the sounding body 63 to ring.

FIG. 5 shows a flowchart of the CPU 42 of the call judging device. First, in step 200, a reception signal received by the wireless device 24 is input from the CPU 34 at regular intervals, and it is determined whether or not this signal is a selection signal. When it is determined that the signal is the selection signal, in step 210, the number of times of inputting this signal is counted and the time is measured. In step 220, a response signal indicating whether or not the press talk is responded by the wireless device 24 is read from the CPU 34.

Next, in step 230, it is judged whether or not there is the response signal, and if there is the response signal, step 270.
The count is reset with and the process is repeated from step 200. That is, the operator responds to the call from the command station on the wireless device 24. On the other hand, if there is no response signal, the count is measured in step 240 and compared with the count value corresponding to a predetermined time, for example, 7 seconds. When the time is shorter than the predetermined time, the process is returned, and the process returns to step 200 and the time until the response signal is input is counted. This cycle is repeated Step 2
If it is determined in 40 that the predetermined time has passed, step 25
At 0, the identification ID number stored in the storage circuit 43 is read, and at step 260, a signal sequence in which this identification ID number is added to the confirmation signal sequence is sent to the CPU 34, and this signal sequence is transmitted from the wireless device 24. To the CPU 34.

In the MCA system of this embodiment, the communication channel is automatically released if the system does not respond within 8 seconds after receiving the selection signal by the system.
The predetermined time is set to be before the call channel is released. However, the set time can be set to 8 seconds or more by sending an arbitrary data signal as a call signal for a very short time from the call determining device as needed. With this setting, a ringing signal is transmitted on the speech channel when the operator does not answer.

After step 260, the radio device 24 transmits a call signal in which a call ID number is added as information to the empty space of the normal confirmation signal on the call channel in accordance with an instruction from the CPU 42 of the call determination device. This calling signal, that is, the confirmation signal is also received by the command station 21, but since the command station 21 has previously received once as a response to the selection signal, the current confirmation signal is meaningless as the second report. Further, since the paging signal is transmitted on the call channel, it does not affect other stations. Then, in step 270, the count is reset.

FIG. 6 shows a flowchart of the CPU 59 of the portable calling device 26. First, in step 300, the signal train of the FSK signal of a certain one communication channel radio wave received by the receiving circuit 50 is read from the demodulation circuit 58. In step 310, a carrier signal is detected from the signal sequence to determine whether or not there is a carrier signal. If no carrier signal is detected in the signal train, step 360 is executed. In step 360, the number of times N of input of the call channel radio wave is judged. When the number N is less than 15, the process proceeds to step 370, and the frequency shift signal is output to the frequency synthesizer 54 of the receiving circuit 50 so as to receive the next call channel radio wave. To do. Then, when the next call channel radio wave is received, step 300 is started again.

Since the portable calling device 26 does not know which communication channel the calling signal is transmitted, the cycle for sequentially counting one channel over all 15 communication channels described in the prior art is repeated. (Steps 360-38)
0). Finally, when N becomes 15 in step 360, the corresponding calling signal is not detected, so that it is determined that the portable calling device has not been called.

The above cycle is repeated at a period of about 50 ms, and considering the case of scanning all 15 channels, it is sufficient that the time of the ringing signal to be transmitted is, for example, 1 second.

On the other hand, when the carrier signal is detected in step 310, the process proceeds to step 320, in which the call ID number (NA) of the call signal is detected and the call ID is detected.
Determine if there is a number. And the call ID number (N
When A) is detected, step 330 is executed. In step 330, the calling ID number (NB) of the portable calling device is read from the storage circuit 60. Then step 3
At 40, it is determined whether or not the call ID number (NA) is the same as the call ID number (NB) in the portable caller. Then, if it is determined that they are the same, step 350 is executed. In step 350, it is determined that there is a call from the mobile station 23 due to the matching of the call ID number, and a notification signal is output to the amplification circuit 62 of the notification circuit 61. This causes the sounding body 63 to ring. On the other hand, if the desired call ID number is not detected in step 320, or if the call I
If it is determined that the D numbers are not the same, step 36
0 is executed, and the speech channels that have not been received are sequentially scanned, and the determination is similarly performed.

As described above, the call judging device 25 is provided with the radio device 24.
After the selection signal is received, it is judged that there is no response from the operator, and then the confirmation signal is added with the call ID number to be transmitted with a delay. On the other hand, the portable caller 26 calls the received call signal. The ID number and the calling ID number of the portable calling device are compared, and when both match, the sounding body is sounded to notify the operator.

Here, the conditions under which the call judging device transmits the call signal, that is, the conditions under which the operator judges that there is no response, are adjusted by the program software of the call judging device 25 according to the usage conditions of the subscriber. It can be handled only by changing

Therefore, to describe a modification of this embodiment, when the mobile station does not respond even if the command station makes a plurality of calls by changing the program software of the call determining apparatus, that is, M
A method of transmitting a calling signal by the selection signal of the second time (M is an integer of 2 or more), or calling the M times (M is an integer of 2 or more) from the same station by detecting and determining the station ID number of the partner from the selection signal It is also possible to use a method of transmitting a calling signal when there is an occurrence.

On the other hand, in the portable calling device, in addition to the sounding body, other notification means, for example, a vibrator can be used.

Further, not only the MCA system (800 MHz band) introduced in this embodiment, but a similar system of 150 M
Obviously, the principle of the present invention can be applied to various commercial radios in the Hz band and the 400 MHz band.

[0034]

As described above, according to the present invention, it is not necessary to install a separate portable caller calling device and antenna, and a portable caller can be secured by a high-power radio wave from a conventional radio device. By performing the above operation, simplification of equipment or addition of functions, assurance of calling, and efficiency of radio wave use can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention.

FIG. 2 is a diagram showing a configuration of an embodiment according to the present invention.

FIG. 3 is a circuit block diagram of a radio device and a call determination device according to the embodiment of FIG.

4 shows a circuit block diagram of the portable paging device of the embodiment of FIG.

5 shows a flowchart of a CPU in the call determination device of FIG.

FIG. 6 shows a flowchart of a CPU in the portable paging device of FIG.

FIG. 7 is a diagram showing a configuration of a conventional calling device.

[Explanation of symbols]

 21 ... Command station 22 ... Control station 23 ... Mobile station 24 ... Wireless machine 25 ... Call determination device 26 ... Portable caller

Claims (1)

[Claims] 1. Radio communication comprising first and second radio stations (1, 2) and a portable paging device (3) which responds to a call by either of the first and second radio stations. In the system, the first wireless station (1) comprises a sending means (4) for sending a selection signal of the second wireless station (2), and the second wireless station (2) is Sending means (5) for receiving a selection signal and sending a confirmation signal to the first wireless station;
Timer means (6) for measuring the time until the start of transmission of a call signal after receiving the selection signal, and sending control means for sending a calling signal for operating the portable calling device when the time is a predetermined time or more (7) A wireless communication system comprising: