JPS62250733A - Paging exchanging system - Google Patents

Abstract

PURPOSE:To select a paging frequency and to communicate and receive a paging call by transmitting a testing signal with plural different paging frequencies, and changing over a tuning frequency to the frequency to be able to be detected with a testing signal by a pager when a disturbing electric wave appears. CONSTITUTION:When a pager 5 executes the tuning, for example, with a frequency f2 out of the always radiated tuning frequency, a testing code detected by a frequency testing circuit 7 through a tuning circuit 6 and a detecting circuit 11 because of the appearance of the disturbing electric wave can not be detected. After a changing-over instructing signal outputted by the frequency testing circuit 7 is received, a frequency changing-over circuit 8 outputs an instructing signal to the tuning circuit 6 so as to tune to the frequency to be able to be next tuned, for example, a transmitting frequency f3. Thus, the signal can stay at the frequency to be able to be always detected by the testing code, and when the frequency can not be detected, a tuning frequency can be successively changed over. When the frequency to be able to be detected by the testing code stably is found out, a paging call from a general subscriber enters a paging exchanging device 2 through an incoming trunk 1, and the transmitting of the data edited paging code is awiated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a paging switching system comprising a paging switching device, a wireless paging transmitting device, and a pager.

(Prior Art) Conventionally, as a method for avoiding radio interference in a mobile radio telephone switching system, a paging channel used when calling from a general subscriber to a mobile subscriber, in addition to a call code, The frequency number of an access channel that can be used when calling from a mobile subscriber to a general subscriber is constantly transmitted, and within the time when there is a call from a mobile subscriber to a general subscriber using the frequency of the access channel transmitted by the paging channel. If this is not done, the paging channel frequency is switched to the other new frequency and the mobile subscriber's paging channel receiver receives both paging channel frequencies alternately and the electric field There was a method that combined the method of fixing the tuned circuit to the stronger one. The above method cannot be used in the paging exchange system, since it is possible to make a call from a general subscriber to a pager, but not in the opposite direction.

Further, by selecting a tuning frequency by determining the electric field strength, it is not possible to determine whether it is a jamming wave or a paging call.

[Problem that the invention seeks to solve]

In the above-mentioned method for avoiding jamming waves, it was possible to know the status of visitor waves on the paging frequency by monitoring mutual data exchange between general subscribers and mobile subscribers, but in the paging exchange system, , the above method cannot be used because only one-way calls from general subscribers to pagers are possible.

[Means for solving problems]

In the paging exchange system of the present invention, the paging exchange device includes a test code generator that generates a test code used to test whether or not jamming waves are being received within the pager, and the wireless paging exchange device includes: The pager comprises a plurality of devices having different paging frequencies necessary for paging the pager and constantly transmitting the verification code, and the pager includes a tuning circuit capable of tuning to the plurality of paging frequencies. The present invention is characterized in that it includes a frequency verification circuit that verifies whether or not interference waves are being received from the output of the detection circuit, and a frequency switching circuit that switches the tuning frequency of the tuning circuit based on the verification result of the frequency verification circuit.

When a pager generates interference, it switches its tuning frequency to a frequency that can detect a test signal, so the pager can select the best paging frequency at the location where the pager is located and paging according to the visitor wave situation at that location. Paging calls can be transmitted and received by selecting a frequency.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the paging exchange system of the present invention.

The paging exchange device 2 has a verification code generator 4 that generates a verification code used to verify whether or not the pager 5 is receiving jamming waves. Wireless paging transmitter 3. ．． 32°..., 3n have different paging frequencies f,,f,...,fn, respectively,
The verification code from the verification code generator 4 is constantly radiated into the air as radio waves. The pager 5 has the plurality of paging frequencies f1. A tuning circuit 6 that can tune to f2, -, fn, and a detection circuit I that extracts information carried by radio waves! , a frequency verification circuit 7 that verifies whether or not interference is being received from the output of the detection circuit 11, a frequency switching circuit 8 that switches the tuning frequency of the tuning circuit 6 based on the verification result of the frequency verification circuit 7, and a self-pager. A self-code discrimination circuit 9 for determining whether or not the call is to a self-pager-5;
It consists of a notification circuit 10 that notifies the holder of the call when the call is made to the user. Thereby, the tuning frequency of the pager 5 can be tuned to any one of the transmission frequencies f1 to fn other than the frequency at which the verification code cannot be detected due to interference radio waves.

Next, the operation of this embodiment will be explained.

The verification codes from the wireless paging transmitting devices 31, 32, -, and 3n are each paging frequency f.

, f2. ..., is constantly radiated into the air by fn.

Now, when the pager 5 is tuned at the tuning frequency f2, for example, if a jamming wave appears, the verification code that was detected by the frequency verification circuit 7 after passing through the tuning circuit 6 and the detection circuit 11 cannot be detected, and the frequency Verification circuit 7 outputs a switching instruction signal to frequency switching circuit 8 . In response to this, the frequency switching circuit 8 outputs an instruction signal to the tuning circuit 6 to tune to the next tuneable frequency, for example, the transmission frequency f3. In this way, it is possible to always stay at a frequency where the test code can be detected, but if it cannot be detected, the tuning frequency is switched one after another.

If a frequency is found where the verification code can be stably detected, then the paging call from the general subscriber will enter the paging switching device 2 via the incoming trunk 1 and wait for the transmission of the data-edited matching code. . The paging code is sent to the local code discrimination circuit 9 via the tuning circuit 6 and the detection circuit 11, and when it is determined that the call is a paging call to the local pager 5, the notification circuit 10 is activated.
Inform the owner of the pager.

〔Effect of the invention〕

As explained above, the present invention transmits a test signal for testing whether or not jamming waves are being received within the pager from a wireless paging transmitter at a plurality of different paging frequencies. By switching the tuning frequency to a frequency where the verification signal can be detected, the best paging frequency at the location where the pager is located and the paging frequency according to the visitor wave situation at that location are selected and the paging call is transmitted. , it has the effect of being able to receive data.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the paging exchange system of the present invention. 1...Person trunk, 2...Paging exchange device, 4...Verification code generator, 5...Pager-1 6...Tuning circuit, 7...Frequency verification circuit, 8... Frequency switching circuit, 9... Own code discrimination circuit, 10-... Notification circuit, +1-... Detection circuit.

Claims (1)

[Claims] In a paging exchange system including a paging exchange device, a wireless paging transmitting device, and a pager, the paging exchange device generates a verification code used to verify whether or not the pager is receiving interference radio waves. The wireless paging transmitting device includes a verification code generator, and includes a plurality of devices that have different paging frequencies necessary for calling a pager and constantly transmits the verification code, and the pager is configured to transmit the verification code at all times. A tuning circuit that can tune to the paging frequency of the detector, a frequency verification circuit that verifies whether interference is being received from the output of the detection circuit, and a frequency switching circuit that switches the tuning frequency of the tuning circuit based on the verification results of the frequency verification circuit. A paging exchange system comprising: