JPS63310230A - Radio individual call system - Google Patents

Abstract

PURPOSE:To confirm a slave station call by a master station, and also, to know the position of a slave station by providing a means for detecting an input level of a receiving signal and setting it onto an answer-back signal, on a portable type slave station, and providing a means for decoding and outputting this information on the master station. CONSTITUTION:A high frequency signal containing a discrimination signal and a message signal from a master station 1 is set onto a transmission part 5 and radiated from an antenna 7. A slave station 2 receives said signal and processes the received signal, and when it is decided that its own station has been called, a sounding part 14 is operated, and also, a message from the master station is displayed on a display part 15. Also, the slave station 2 detects a level of received input by a received input level detecting part 16, and this level is compared with a prescribed value determined in advance, by a comparing part 17. Whether the compared level is large, middle or small is divided, and a control part 13 transmits an answer-back signal containing the detected level information and the discrimination signal from an antenna 9. It is received by the master station 1, the detected level information contained in the answer-back is decided, decoding is executed, and its decoding output is displayed on an output device 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a master station that wirelessly transmits a signal for making an individual call, and a portable mobile station that wirelessly returns an answerback signal to confirm reception of the transmitted signal. The present invention relates to a wireless individual paging system consisting of a station.

2. Description of the Related Art In conventional radio paging systems of this type, an identification code is set for each slave station to identify selective calls between multiple slave stations and one master station, and this identification code is applied to a carrier signal. I try to send and receive it by carrying it. That is, first, the transmission signal from the master station to the slave station includes the identification code of the slave station to be called, and after receiving and detecting it at the slave station, it combines the identification code stored in its own station and the transmitted identification code. The identity of the codes is checked, and if they are the same, a ringing alert is issued and an answerback signal is sent back to the master station. If the identification codes are not the same, no sounding operation will be performed and no answerback signal will be returned.

Since the answer bank signal includes the identification code, the parent station can confirm that a call has been made by decoding it.

Problems to be Solved by the Invention However, as mentioned above, in the conventional wireless individual paging system, from the perspective of the master station, it is only possible to know whether or not the call to the intended slave station has been made normally. Therefore, it was not possible to know the location of the slave station.

Since a slave station can be carried around, for example, as a mobile phone, it would be convenient to know whether the person holding the slave station is far from the master station or nearby. This is because it is possible to estimate the amount of time it will take for the person to arrive at a predetermined location after making a call, and to be able to instruct the direction in which the person should move.

Therefore, an object of the present invention is to enable the master station to not only confirm a call to a slave station, but also learn the location of the slave station.

Means for Solving the Problems The present invention provides a radio system comprising a master station that transmits a signal for individual calling, and a portable slave station that returns an answerback signal to confirm reception of the transmitted signal. In this individual paging system, a slave station is provided with means for detecting the input level of a received signal and information on the detected level is placed on an answerback signal, and a master station is provided with means for decoding and outputting the information. .

For example, when the input level of the received signal detected by the slave station is high, information indicating that the slave station is located close to the master station is added to the answerback signal.

Conversely, when the received input level is low, information indicating that the location is far away is loaded. This information is received by the master station, decoded, and output, and displayed, for example, on a printer or CRT display in the form of characters or graphics. In this way, the parent station can clearly grasp the location of the slave station.

Embodiment In FIG. 1 in which the present invention is implemented, (1) is a master station, and (2) is one of a plurality of slave stations that can be called by the master station. The master station (1) includes a control unit (3) consisting of a microcomputer, an input device (4) consisting of a keyboard etc. that provides input data and commands to the control unit (3), and output from the control unit (3). A transmitting unit (
5), a transmitting/receiving antenna (7) that radiates the transmission signal supplied from the switching unit (6) and the transmitting unit (5) as radio waves;
When the master station (1) receives an answerback signal radiated from the transmitting/receiving antenna (9) of the slave station (2), the receiver (8) converts the frequency and detects the answerback signal, and the controller (3) ) and an output device (10) for outputting and displaying the processed results. The output device (10) is a printer or a CRT display.

On the other hand, the slave station (2) includes a transmission/reception switching section (11), a receiving section (12), and a control section (1) consisting of a microcomputer.
3), a sound section (14), a display section (15) for displaying messages, etc., and a detection section (1) for detecting the input level of the received signal.
6), a comparison section (17) that compares the detected level with a plurality of predetermined values, a transmission section (18), and the like.

Next, the operation will be explained.

First, on the master station (1) side, identification data for specifying a desired slave station is input to the control section (3) using the input device (4).

The control section (3) provides this input data to the transmitting section (5). In the transmitter (5), the identification signal is placed on the high frequency signal by modulating the high frequency signal as a carrier with this identification signal.

The transmission signal thus formed is radiated from the antenna (7) and received and processed by the slave station (2). At that time, the slave station (2) detects the identification signal in the received signal,
The identification code of this station is compared with the identification code of the own station stored in the memory in advance, and if they match, the sound part (14) is sounded and the holder of the slave station (2) is called. The antenna (9) outputs an answerback signal and notifies the
radiate from.

Note that the answer back signal is a signal obtained by modulating a high frequency signal with an identification signal and a reception level detection information signal to be described later. Transmission signals including the calling signal (identification signal) sent from the master station (1) to the slave station (2) are attenuated for various reasons during wireless transmission, and generally the longer the transmission distance, the lower the signal level. It gets lower.

A detection section (16) detects the input level of the received signal frequency-converted by the reception section (12). Specifically, it is detected by envelope detection or the like. This detection output is compared with a plurality of (for example, three) predetermined reference levels in the next-stage comparison section (17). The comparison output is given to the control unit (13), and information corresponding to the level of large, medium, or small is provided to the control unit (13).
3) is generated. This information is given to the transmitter (18) together with the aforementioned identification signal, where the high frequency signal is modulated to form an answerback signal.

When the answerback signal having the identification signal and detection level information is emitted from the antenna (9), the master station (
1), this answerback signal is caught by an antenna (7), frequency-converted by superheterodyne in a receiving section (8), detected, and provided to a control section (3). The control unit (3) determines whether the transmitted identification code and the returned identification code match, and -
If it fails, the output device (1
0). The control unit (3) also decodes the detection level information, outputs a signal representing the position of the slave station (2) according to the content, and outputs a signal indicating the position of the slave station (2). Display in (10). This makes it possible to determine whether the position of the slave station (2) is near, midway, or far from the master station (1).

For example, if this system is used in a building and the master station is on the first floor, although it is not limited thereto, there are substations on the first, second, third,..., nth floors. By testing the level of a station in advance and storing it as data, it becomes possible to display on the output device (12) what floor the person with the called slave station is currently on. . In that case,
It is assumed that a number of reference values for level comparison in the comparing section (17) are prepared in accordance with the rank number n. In such a case, the level detection information transmitted from the slave station may be a signal representing those floors.

In this system, the transmission signal given from the master station (1) to the slave station (2) can include not only the above-mentioned calling signal (identification signal) but also a message signal. The message based on the message signal is displayed on the display section (15) on the slave station side.
) is displayed.

Next, a flowchart regarding the above-mentioned operation is shown in FIG.

First, in step (#1), a high frequency signal including an identification signal and a mensage signal is transmitted from the master station (1).

The slave station (2) receives this and processes the received signal (
#2). As a result, if it is determined that the own station is called, the sound unit (14) is activated and the display unit (15) is activated.
The slave station (2) displays the message sent from the master station (#3), and detects the level of the received input (114).
). Next, the detection levels are compared and the level is classified as high, medium, or low (115).
. The control unit (13) provides information corresponding to the high, medium, or low detection level to the answerback signal (116. #7.
D). The slave station (2) transmits an answerback signal containing this detection level information and identification signal (#9). The master station (1) receives this (#10). In FIG. 2, the dotted lines connecting (#1) and (#2) and between (#9) and (+110) indicate wireless sections.

Next, in (#11), the answerback signal is determined, specifically, the detection level information included in the answerback signal is determined, and accordingly (1112) to (#13) are decoded. The decoding output is sent to the output device (1115) (
10).

In the embodiment shown in FIG. 1, the control unit (3) has a function of processing the comparison result and driving the output device (10), and the input device (4) and the output device (10) are simply data The input device (4) and the output device (4) are connected to the control unit (3).
Instead of 10), a personal convenience store computer may be connected and this personal computer may be in charge of the display calculations, etc. This is effective when the capacity of the control section (3) is small and cannot process a large amount of data (messages, etc.). Note that input data may be input using a keyboard attached to a personal computer, and output display may be performed using an output means of the computer.

Although the present invention has been described above with reference to examples, the present invention is not limited to these examples, and various changes and modifications can be made without departing from the gist of the invention described in the claims. is possible.

Effects of the Invention According to the present invention, there is an effect that it is possible not only to simply confirm a call, but also to know the location of the called slave station on the side of the master station, which is extremely effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a wireless individual paging system according to an embodiment of the present invention, and FIG. 2 is a flowchart of its operation. (1)...Master station, (2)...Slave station, (3)
...Distribution section of the master station, (5)...Transmission section of the master station,
(8)...Receiving unit of the master station, (10)...Output device of the master station, (12)...Receiving unit of the slave station,
(13)...control unit of the slave station, (16)...detection unit, (17)...comparison unit, (18)...transmission unit of the slave station.

Claims (1)

[Claims] (1) In a wireless individual calling system consisting of a master station that transmits a signal for individual calling, and a portable slave station that returns an answerback signal to confirm reception of the transmitted signal, A wireless individual call system characterized in that the slave station is provided with means for detecting the input level of a received signal and puts information on the detected level on an answerback signal, and the master station is provided with means for decoding and outputting the information. system.