JPS60224340A - Wide-range paging system - Google Patents

Abstract

PURPOSE:To reduce the radiation of unnecessary radio waves by providing a frequency variable synthesizer transmitter in each call zone and setting a home zone to a subscriber as a called subscriber. CONSTITUTION:In case that a calling subscriber 1 calls a subscriber 14 whose home zone is a zone 10, the call signal is inputted to an encoder 4 through an exchange 3. The subscriber's code signal from the encoder 4 is applied to controllers 15 and 25, and the controller 15 transmits the call signal to the subscriber 14 after matching a frequency variable synthesizer transmitter 19 or 27 to the radio frequency of the subscriber 14. The controller 25 does not issue a radio wave radiating instruction to a transmitter 26 because the subscriber 14 is not a subscriber of a zone 20. If the subscriber 14 goes into the zone 20 unexpectedly, the calling subscriber 1 designates the zone 20 to call the subscriber 14 because the calling subscriber 1 cannot receive the response from the subscriber 14 over a prescribed time, and then, the controller 15 instructs transmitters 19 and 27 to stop the radiation of radio waves, and the controller 25 issues a command to match the transmitter 26 to the radio frequency of the subscriber 14 and causes the transmitter 26 to radiate radio waves, and thus, the call signal to the subscriber 14 is transmitted.

Description

Detailed Description of the Invention (Technical Field of the Invention) In the L1 wide area paging system of the present invention, the number of installed transmitters is reduced and radio waves are wasted in zones where there is a low possibility that a called party exists. The present invention relates to a method for reducing such emissions.

(Prior Art and Problems) FIG. 1 is a block diagram showing the configuration of a conventional wide area paging system. In the figure, 1.2 is a calling party, 3 is a switch, 4.5 is an encoding device, 10.20 is a service zone (also simply called a zone), 11.12.21.22 is a transmitter, and 13.23 is a The antenna, 14.24, is the called party. The transmitter 11 and the transmitter 21 have the same transmission frequency (temporarily f,
), and the transmitter 12 and the transmitter 22 have the same transmission frequency (temporarily assumed to be h).

Now, if calling party 1 tries to call called party 14,
Assuming that the assigned frequency of the called party 14 is L, the signal emitted by the calling party 1 is applied to the encoding device 4 via the exchange 3, and the output signal of the encoding device 4 is applied to the transmitter 11 of the zone 10.
and was added to transmitter 21 in zone 20, and both transmitters turned into radio frequencies and were emitted simultaneously to both zones.

In this way, conventional wide-area paging systems install as many transmitters as the number of assigned frequencies in each zone, and emit radio waves for paging signals in all zones, regardless of which zone the called party is located in. was.

However, if the called party 14, who is a subscriber, is usually in zone 10 and rarely in sea 720, it would be wasteful to emit a paging signal from transmitter 21 in zone 20. That's true. In addition, if the number of subscribers existing in zone 10 is significantly larger than the number of subscribers existing in zone 20 when looking at the total number of subscribers, the same number of transmitters as zone 10 are installed in zone 20. There is also the problem that the installation efficiency of the transmitter is poor if the transmitter is left in the same place.

(Objective of the Invention) The object of the present invention is to provide a variable frequency synthesizer transmitter (hereinafter simply referred to as a synthesizer transmitter) in each calling zone, and to install the same number of transmitters as the number of allocated frequencies as in the conventional system. By setting a home zone for the subscriber who is the called party and determining the number of transmitters according to the number of users who have set the home zone for each zone, the number of transmitters installed can be optimized. In addition to calculating the number of calls, the number of calls is made first in the zone where the probability of the called person being present is highest, and the sequential number of calls is made when there is no response.
By specifying this, the purpose is to prevent calls from being made in zones where the called party is not present, and to reduce the emission of unnecessary radio waves.

(Structure and operation of the invention) The present invention has the following structure in order to achieve the above object. That is, in a wide area paging system that includes an encoding device and a plurality of transmitters connected to the encoding device, the home zone of each subscriber is determined in advance, and the zone is designated as the home zone for each zone. A number of variable frequency synthesizer transmitters are provided in accordance with the number of subscribers to be called, and a control device is provided between each of the transmitters and the coding device, and the first call is made by the subscriber to be called. The second call is made only in the caller's home zone, and the second call is in a paging zone designated by the caller, using a wide area paging method in which the transmission frequency of the transmitter is switched to a radio frequency corresponding to the called number and a paging signal is transmitted. be.

The present invention has the above configuration and operates in the following manner. Now, when a caller dials the number of a particular subscriber to call that subscriber, this signal is applied via the exchange to the encoding device and the encoded signal is applied to the control device. This control device determines the assigned frequency and home zone of the called subscriber from the encoded signal, and causes only the transmitter in the home zone to switch to the assigned frequency and operate to transmit a paging signal radio wave.

The purpose is achieved if the called party is present in the home zone and answers the call. On the other hand, if the desired called party happens to exist in a zone other than the home zone, the call cannot be detected because the radio waves transmitted by the transmitter in the home zone cannot be received alone.

Therefore, there will be no response. In such a case, the caller will make a second call, but at this time,
The calling party specifies a zone in which the called party is likely to exist and makes a call. Same as the first call,
The paging signal passes through the exchange and the encoding device to the control device, where it is determined that it is the second paging and the designated zone, and a control signal is sent to the transmitter to operate the transmitter in the designated zone at the assigned frequency. send to If there is no response to the second call, the same procedure as the second call is repeated.

(Example of the invention) Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a block diagram showing the configuration of an embodiment in which the method of the present invention has two zones. Numbers 1 to 5.10 in the figure.
13.14.20 and 23.24 are the same as in FIG.

15.25 is a control device newly provided in the method of the present invention, and 19 and 26.27 are synthesizer transmitters. In this embodiment, the number of subscribers whose home zone is zone 10 is greater than the number of subscribers whose home zone is zone 20. Therefore, there are two transmitters in zone 10 and one transmitter in zone 20. It is a stand. Generally, an optimal number of transmitters is installed depending on the number of subscribers who make each zone their home zone. Now consider the case where calling party 1 calls subscriber 14 whose home zone is zone 10.

The call signal passes through the exchange 3 and enters either a coding device 4 or 5, which is predetermined by the subscriber's code. Assume now that the encoder 4 has entered. The output signal of the encoding device 4 is transmitted to the control device 15 of the zone 10 and the zone 2.
0 control device 25.

In this embodiment, since the subscriber 14 has the zone 10 as his home zone, the control device 15 tunes the transmitter 19 or 27 to the radio frequency of the subscriber 14 and then sends out a calling signal for the subscriber 14. However, since the subscriber 14 is not a subscriber in its own zone, the control device 25 corresponding to the zone 20 does not issue a command to the transmitter 26 to tune to the radio frequency of the subscriber 14 or to send out a paging signal.
In this case, radio wave emission will not occur.

Subscribers generally register the zone in which they are most frequently present among multiple zones as their home zone, so simply emitting radio waves for a paging signal from the transmitter in the home zone can resolve the purpose of the call. The frequency at which this is achieved will inevitably increase. This eliminates the need to emit unnecessary radio waves from transmitters in other zones, and the emission of cine-required radio waves can be reduced accordingly. In this embodiment, if the subscriber 14 exists within the zone 10, the purpose is achieved after - number of calls, and no radio waves are emitted in the zone 20. On the other hand, if the subscriber 14 happens to be present in the zone 20, the subscriber 14 will not be able to sense the call and will not respond if only the radio waves of the calling signal are emitted in the zone 10. Then, the caller 1 receives no response from the subscriber 14 even after a certain period of time has elapsed, so he then specifies the zone 20 and calls the subscriber 14 again.
The control device 15 corresponding to the zone 10 does not command the transmitters 19 and 27 to emit radio waves in the zone 10; instead, the control device 25 corresponding to the zone 20 tunes the transmitter 26 to the radio frequency of the subscriber 14 before joining. A call signal for the person 14 is sent out.

FIG. 3 is an example in which a control device 6 having both functions is used in place of the control devices 15 and 25 in FIG. 2, and the same effects as in FIG. 2 can be obtained.

In the embodiment shown in FIG. 2, it is assumed that the radio waves transmitted by each transmitter are distributed throughout its own zone.
If the radio waves from one transmitter cannot spread throughout the zone due to the topographical conditions of the zone, the installation conditions and area of the transmitting equipment, etc., multiple transmitters that receive the same command from the same control device and operate at the same time may be used as appropriate. They are also installed at locations so that the radio waves that call subscribers can be distributed throughout the zone.

An example is shown in FIG. That is, within one zone 10, transmitters 19 and 1 receive the same command from the same control device.
6 operate in the same manner, and transmitters 12 and 27 operate in the same manner so that the radio waves of the calling signal can reach the subscriber 14 wherever he or she is within the zone 10.

(Effects of the Invention) As explained above, the wide area paging system to which the method of the present invention is applied has the following advantages. 1st
By adopting a variable frequency synthesizer transmitter as the transmitter, there is no need to install a separate transmitter for each assigned frequency as in the past, and unnecessary capital investment can be saved. Second, among multiple zones, by registering the zone where each subscriber is present most frequently as the home zone, it is possible to grasp the call frequency for each zone.
The number of transmitters installed can be determined depending on the number of subscribers who make each zone their home zone. This, together with the first advantage, makes it possible to set the number of transmitters installed in each zone to a necessary and sufficient number.

Third, the first call to a subscriber activates only the transmitter in the subscriber's home zone to emit paging radio waves, and if there is no response, paging radio waves are emitted in the next zone according to the caller's specifications. However, since the probability that the subscriber exists in the home zone is high for the reason that the home zone was defined, the purpose of the call is often achieved by calling only in the home zone. Therefore, compared to the conventional system in which radio waves are emitted in all zones, the emission of unnecessary radio waves in other zones can be significantly reduced.

The method of the present invention has the advantages described above.

Hereinafter, the effects of the invention in Examples of the present invention will be shown with specific numerical values.

There are two service zones, Zone A and Zone B, and the number of subscribers that can be accommodated by one encoding device is 10ρ00.
Assuming that the total number of subscribers is 3oρOo and the number of calls per day to each subscriber is one, in the conventional system, there are three encoders and a transmitter for each encoder, so there is no need for zone A and zone B. There are 6 units in total, 3 units each, and the number of call radio waves emitted is 30ρ00 times a day for both Zone A and Zone B.

Next, consider a case where the method of the present invention is applied. First, set your home zone. Among the subscribers accommodated in the encoder 1, the subscriber whose home zone is zone A is 7ρ00, the subscriber whose home zone is zone B is 3ρ00, and similarly for the encoder 2, the former is 8ρOO1, the latter is 7ρ00. 2,
000, encoding device N[For L3, the former is 9ρOO1
If the latter is 1,000, the total number of subscribers whose home zone is Zone A is 24ρ00, and the total number of subscribers whose home zone is Zone B is 6ρ00.

The appropriate number of transmitters for this number is 3 for Zone A,
Since there is only one transmitter for zone B, two transmitters for zone B can be saved compared to the conventional system.

Next, regarding the number of paging radio waves emitted per day, the -th call is 24ρoo in zone A and 6ρ0 in zone B.
It becomes 0.

In addition, assuming that once in 10 there is a second call in another zone due to the subscriber being in another zone instead of his home zone, the second call in zone A will be 6°000X ( 11 = 600 and 9, the second call in zone B is 24,000
X 01 = 2,400, after all, in zone A it is 24,
600 times, and 8,400 times in zone B.

In the conventional system, each zone was emitted 30ρ00 times, so unnecessary radio wave emissions are reduced by 5,400 times (18 times) for zone A and 21,600 times (72%) for zone B.

If the above is tabulated, it will look like Table 1.

As described above, the wide area paging system to which the method of the present invention is applied has the great effect of significantly reducing the number of installed transmitters and the number of times unnecessary radio waves are emitted, compared to conventional systems.

Table 1.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional wide area paging system, FIG. 2 is a block diagram showing the configuration of a first embodiment to which the method of the present invention is applied, and FIG. 3 is a block diagram to which the method of the present invention is applied. The 20th is a block diagram showing the configuration of the actual flow side, and the 4th is a block diagram showing an example of the transmitter configuration in one zone when the method of the present invention is applied. 1.2... Caller, 3...
・・Switching machine, 4.5 ・・・・・ Encoding device, 1
0,20・・・・・・・・・Service zone, 11.1
2.21.22...Fixed frequency transmitter, 13.18.23...Song/antenna, 14.24.
・・・・・・・・・Subscriber as called party, 6.15.25・
......Control device, 16.17.19.26.
27...... Frequency Variable Synthesizer Transmitter Agent Patent Attorney Yoshihiro Yawata

Claims (1)

[Claims] In a wide area paging system having an encoding device and a plurality of transmitters connected to the encoding device, the home zone of each subscriber is determined in advance, and each zone is subscribed to the zone as the home zone. A number of variable frequency synthesizer transmitters are provided according to the number of users, and each of the transmitters and the encoder sets the transmission frequency of the transmitter for the second call in a calling zone designated by the sender. A wide area paging method characterized by transmitting a paging signal by switching to a radio frequency corresponding to the called number.