JPH01225235A - Radio call system - Google Patents

Abstract

PURPOSE:To receive a call service even when the porter of a radio call receiver moves among plural service areas by announcing the service area, which presently exists in a bloc, to the porter of the radio call receiver with a sound or display, etc. CONSTITUTION:Central radio base stations 5a and 5b and peripheral radio base stations 6a, 6b, 7a and 7b respectively send a radio frequency signal for calling from transmitters 10 and 12 for calling to service areas 9a and 9b. Then, a radio frequency signal for area announcement is sent from transmitters 11 and 13 for area announcement. When the porter of radio call receivers 8a and 8b moves between the service areas 9a and 9b, the radio call receivers 8a and 8b detect the level change of the radio frequency signal for calling and the service area, which presently exists in the bloc, is announced to the porter with the sound or display, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a radio paging system, and in particular, even if the person carrying a radio paging receiver moves to a pond service area, This relates to a wireless paging system that enables

[Conventional technology]

FIG. 3 is a diagram showing the configuration of a conventional radio paging system, and FIG. 4 is a block diagram showing an example of the configuration of a conventional radio paging receiver.

As shown in FIG. 3, a unit service area is composed of a central radio base station that transmits a selective paging signal using the same paging radio frequency and a plurality of surrounding M-free base stations.

In this case, different paging radio frequencies are assigned to adjacent service areas, but the same paging radio frequency may be assigned to service areas that are distant from each other.

In FIG. 3, a calling party 51 who attempts to call a person carrying a radio paging receiving fi 58 who is moving within a service area 59a dials a calling number individually assigned to the radio paging receiving fi 58. The dialed number is
The signal is sent via the public communication network 2 and the radio call switch 53 to the selective call signal generator 54a. The selective calling signal generating device 54a generates a selective calling signal corresponding to the calling number. The central radio base station 55a and the peripheral radio base stations 56a and 57a transmit a signal of radio frequency fa modulated by the selective paging signal, and the radio paging receiver W1158 receives this signal.

The radio paging receiver has a configuration as shown in the MS4 diagram, and radio waves transmitted from each radio base station are received by a receiving antenna 65 and passed through a receiving section 60, and then sent to a detecting section 61.
The wave is detected and demodulated by

The output of the detection section 61 is guided to the decoder section 62. The decoder section 62 compares the selective calling signal stored in the ROM 64 with the demodulated selective calling signal, and when the two match, outputs a signal such as a ringing tone and display from the output section 63, and sends a signal such as a ringing tone and display to the mobile phone of the radio calling receiver. Notify the person that you are being called.

[Problem to be solved by the invention]

In the conventional radio paging system as described above, the radio paging receiver existing in the service area 59a in FIG. 3 receives only the paging radio frequency "a" assigned to each radio base station in the service area 59a. However, it is possible to emit signals such as a ring tone and display only in response to a selective call signal sent at that radio frequency.

Therefore, the central radio base station 55b and the peripheral radio base stations 56b use the paging radio frequency fb.

If you move to the service area 59b formed by 57b, you will not be able to make calls.

Therefore, the conventional radio paging system has a problem in that it is necessary to have a plurality of radio paging receivers in order to receive paging services in a plurality of service areas.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide a radio paging system that allows calling even when the person carrying a radio paging receiver moves between multiple service areas. It is said that

[Means to solve the problem]

According to the invention, the above objects are achieved by the means specified in the claims.

That is, the present invention provides a radio paging system in which a unit service area is formed by at least one radio base station, and a plurality of unit service areas are adjacent to each other, in which a paging radio frequency signal carrying a selective paging signal and a service are provided. By area a.

a radio base station that transmits a radio frequency signal for service area announcement that uses a frequency common to all service areas and that is a radio frequency signal that carries a service signal, and receives the radio frequency signal for paging transmitted from the radio base station. monitors the level, and when the reception level drops below a predetermined value, receives a radio frequency signal for service area notification, detects a signal for service area identification, outputs the result, and selects the reception frequency as appropriate. This is a radio paging system consisting of a radio paging receiver having means for switching to a radio frequency for paging in a service area.

[For production]

According to the system of the present invention, when a person carrying a radio paging receiver moves from the service area in which he or she was previously and enters another service area, the radio paging receiver receives the paging radio frequency. Recognizing this and receiving the radio frequency signal for service area notification, and detecting the information in the signal, the reception level will be reduced, and the current service area will be recognized and the radio The person carrying the paging receiver is notified, for example, by voice or display.

As a result, the person carrying the radio paging receiver knows that he has moved to a different service area, and by registering his location to the service area in the radio paging exchange through the telephone network, etc., he can make a radio call in the service area. becomes possible.

〔Example〕

FIG. 1 is a diagram showing the configuration of a radio paging system according to an embodiment of the present invention.

In FIG. 1, a calling party 1 who wishes to call a person carrying a radio paging receiver 8a dials a calling number individually assigned to the radio paging receiver. The dialed calling number is sent via the public communication network 2 and the wireless paging exchange 3 to the selective calling signal/area signal generator 4a in the service area 9a whose location is registered in advance, and is converted into a selective calling signal. Ru.

The central radio base station 5a and the peripheral radio base stations 6a and 7a, which are assigned the same radio frequency as the paging radio frequency of the central radio base station, receive a paging radio frequency signal fa modulated by the selective paging signal. is transmitted from each paging transmitter 10. The area signal individually assigned to each service area is always transmitted as a signal rp at the same radio frequency from the area signal notification radio transmitter 11 installed in each radio base station.

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

The operation of each part shown in the figure will be explained below.

The receiving unit 15 amplifies and converts the frequency of the signals received by the receiving antenna 14 at the paging radio frequency and the area notification radio frequency. One reception level detection section detects the level of the received signal and provides the information to the reception frequency control section 21 . The detection section 16 detects the output of the reception section 15 and returns it to the original selective calling signal and area signal.

The reception frequency control section 21 controls the reception frequency of the reception section based on the output signals of the reception level detection section 19 and the area signal detection section 20, and also controls the ROM 22 to provide the decoder section 17 with information on the selective paging signal. When the area signal detection unit 20 receives the area notification radio frequency,
It detects the area signal and provides the signal to the reception frequency control section 21. The decoder section 17 compares the selective calling signal given from the ROM 22 with the selective calling signal demodulated by the detection section 16, and only when the two match, the output section 18
give information to. The ROM 22 stores information on paging radio frequencies and selective paging signals corresponding to each area signal. The output unit 18 emits signals such as a ring tone and a display according to the information given from the decoder W117.

The operation of the radio paging receiver when it moves from the service area 9a to the service area 9b shown in FIG. 1 will be described below.

As the service area shifts, the reception level of the radio paging frequency fa that was being received decreases. The radio paging receiver constantly monitors the reception level with the reception level detection section 19, and when the value falls below a specified value, the reception frequency control section 21
, and controls the receiving unit 15 to receive the area notification radio frequency f. As a result, the area signal detection 7120 detects the area signal and sends the result to the reception frequency control section 21. The receiving frequency control section 21 reads frequency information of the service area 9b from the ROM 22 based on the area signal, and controls the receiving section 15 to receive the paging radio frequency rb.

At the same time, the ROM 22 provides information on the selective call signal in the service area 9b to the decoder section 17 in preparation for a call in the service area 9b.

Further, the area signal detection section 20 outputs the area signal to the output section 1.
8 and displays the area code to notify the person carrying the receiver that the area has changed.

The person carrying the radio paging receiver notifies the radio paging exchange that he/she has moved from one area to another via the telephone network and registers the location. Here, when the next call is made to the radio paging receiver, the radio paging exchange receives the selective call signal/area signal generator 4b of the service area 9b whose location is registered.
Transfer the calling number to. The selective calling signal/area signal generating device 4b converts the calling number into a selective calling signal, sends it to each radio base station, and calls from the calling transmitter 12 installed at each radio base station 5b to 7b in the service area 9b. The signal is transmitted using the radio frequency fb for calling the radio paging receiver.

In the system of the present invention, even when the radio paging receiver moves between multiple service areas, it can receive the paging radio frequency used by each service station 17a at the moving destination and perform radio paging. It is possible to notify the person carrying the receiver that he or she is receiving a call.

Note that the number of movable service areas is limited by the memory capacity of the ROM, but by increasing the capacity it is possible to accommodate a large number of service areas.

On the other hand, engineering 177! A method is adopted in which an area signal and paging radio frequency information are transmitted using a known radio frequency, and an area signal detection section detects the area signal and paging radio frequency information, and sends the information to a reception frequency control section for reception. In this case, the memory capacity of the ROM does not depend on the number of service areas to be moved.

〔Effect of the invention〕

As explained above, according to the radio paging system of the present invention,
There is an advantage that a user carrying a radio paging receiver can receive paging service even when moving between a plurality of service areas.

[Brief explanation of the drawing]

f:lS1 is a diagram showing the configuration of a radio paging system according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a radio paging receiver according to an embodiment of the present invention, and FIG. FIG. 4 is a block diagram showing an example of the configuration of a conventional radio paging receiver. 1...Caller, 2...Public communication network, 3...Radio paging switch, 4
a, 4b...Selective call signal/area signal generator, 5a. 5b...Central wireless base station, 6a,
6b. 7a, 7b......peripheral wireless base station, 8a
. 8b... Radio paging receiver, 9a, 9
b・・・・・・ Service area, 10, 12
°°°°°. Calling transmitter, 11.13...Area notification transmitter, 14...Receiving antenna, 15...Receiving section, 16.
...Detection section, 17 ...Decoder section,
18...Output unit, 19...Reception level detection unit, 20...Area signal detection unit, 21...Reception frequency control unit,
22 ROM agent patent attorney
Takashi Honma Figure 2 Figure 4

Claims (1)

[Claims] A radio paging system in which a unit service area is formed by at least one radio base station, and a plurality of unit service areas are adjacent to each other, the paging radio frequency signal and service carrying a selective paging signal. a radio base station that transmits a service area announcement radio frequency signal that carries an area identification signal and uses a frequency common to all service areas; and the paging radio frequency signal that is transmitted from the radio base station. When the reception level drops below a predetermined value, it receives a radio frequency signal for service area notification, detects a signal for service area identification, outputs the result, and and a radio paging receiver having means for switching the radio frequency to a radio frequency for paging in a corresponding service area.