JPH0193221A - Receiver for radio call - Google Patents

Abstract

PURPOSE:To enable a radio call to be performed by a set of device in plural local service areas by constituting a system so that a local oscillation part to switch a frequency to the ones in the plural local service areas can be selected, and a decoder part to switch signal speed and a signal system can be selected. CONSTITUTION:In manual switching, a control part 10 (microprocessor) is controlled by a manual change-over switch 11, and in automatic switching, a reception waiting state is set by switching a pair to an arbitrary pair out of plural pairs of frequencies, signal speed, and signal systems by the control part 10, and it is decided whether or not a reception wave coincides with switched frequency, signal speed, and signal system based on the electric field strength, bit error rate, and synchronous state of the reception wave, and when no coincidence is obtained, the pair is switched to another set pair of frequency, signal speed, and signal system, and such operation is repeated until a corresponding pair is detected. In such a way, it is possible to provide service to the plural local service areas economically without changing the facility of a base station.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a radio paging receiver that can be used in a plurality of radio paging areas.

(Prior Art) Radio paging receivers currently in use can receive only a single frequency, and therefore can only be used within a single service area, and the signal speed and signal method are fixed. ing.

Figure 4 shows an example of multiple regional service areas.
For example, regional service areas A and B each have their own frequencies F, , F2 . Signal speed a (b/s).

b (b/s), signal systems α and β, and the telephone stations LA and IB in each area call the base stations 2A and 2B to the receivers in the area, for example, point 1 and point 2. Each receiver is called.

Therefore, in order to receive paging service in another area (a receiver in area A can be used in area B, or vice versa), information specific to that area, i.e., frequency, signal speed, signal system, and radio paging reception are required. I needed to prepare a machine.

Furthermore, there is no way to check whether the person carrying the receiver is within the service area of the receiver, that is, whether or not a call can be made, resulting in a lack of convenience.

(Purpose of the Invention) The present invention provides a method for using a single radio paging receiver based on information set in the receiver in advance when a user's activity range spans multiple radio paging areas. The purpose is to make it usable.

(Structure of the Invention) (Characteristics of the Invention and Differences from the Prior Art) In order to achieve the above object, the present invention provides selection of a feedback oscillator, signal speed, and signal system for switching to frequencies within a plurality of regional service areas. The present invention is characterized in that it is configured such that a decoder section for switching can be selected.

Therefore, unlike conventional radio paging receivers that can only receive radio calls within a single regional service area, the present invention is characterized in that a single radio paging receiver can receive radio calls in multiple regional service areas.

(Embodiment) FIG. 1 shows a block diagram of an embodiment of the present invention.
4 is a receiving antenna, 4 is a high-frequency tuning circuit, and 5 is a high-frequency amplification section, which together constitute a high-frequency reception section. 6 is mixer (
MIX), 7 is a synthesizer section, which constitutes a variable local oscillation section for switching and selecting a plurality of frequencies. 8 is an intermediate frequency section that performs intermediate frequency amplification and frequency discrimination. Reference numeral 9 denotes a decoder section, which is composed of a plurality of changeover switches 9a and a plurality of decoders 9b that can be switched by the changeover switches 9a. Reference numeral 10 denotes a control section, which is composed of a microprocessor, and its control signal switches the frequency of the synthesizer section 7, and the changeover switch 9a switches the decoder 9b.

Reference numeral 11 denotes a manual changeover switch, which switches the inside of the receiver to the frequency, signal speed, and signal system specified by this switch during manual operation. Reference numeral 12 denotes a ROM (read-only memory) in which digital codes for a plurality of sets of frequencies, signal speeds, and signal systems are stored in advance. 13 is a speaker, and 14 is a light emitting diode (LED), which notifies the person carrying the receiver that it is ready for use by sounding or emitting means.

Next, the operation will be explained. First, in the case of manual switching, the manual changeover switch 11 controls the control unit 10 (microprocessor), and thereby information that is preset in the ROM 12, that is, multiple sets of frequencies.

The digital code of the signal speed and signal method is read, and the inside of the receiver is switched to the frequency, signal speed, and signal method specified by the manual changeover switch 11. and.

The frequency is switched by a control signal from the control unit 10 to the synthesizer unit 7, and the signal speed and signal method are changed by a changeover switch 9a of the decoder 9b from the control unit 10.
It is switched by a control signal to the receiving state.

In the case of automatic switching, the control unit 10 first switches to any one of the multiple sets of frequencies, signal speeds, and signal systems to enter a reception standby state, and then depending on the electric field strength of the received wave, pit error rate, and synchronization state. , the control unit 10 determines whether the received wave matches the frequency, signal speed, and signal system being switched. As a result of this judgment, if they match, the system enters a reception waiting state; if they do not match, the control section 10 uses a control signal to set the synthesizer section 7 and The changeover switch 9a is controlled to switch, and this operation is continued until the corresponding set is detected.

Furthermore, the receiver constantly monitors the electric field strength, pit error rate, and synchronization state of the received waves, and if these no longer satisfy a certain standard (possibility of reception), it sequentially performs the above-mentioned switching operations.

Furthermore, this receiver controls whether or not the selected frequency, signal speed, and signal system match based on the electric field strength of the received wave, pit error rate, and synchronization state in both manual and automatic switching reception states. Conducted by Department IO. The result of the determination as to whether or not the receiver can be used is notified to the person carrying the receiver by the speaker 13 or the light emitting diode 14 by sound or light emitting means.

FIG. 2 shows a block configuration diagram according to another embodiment of the present invention, in which the same numerals and symbols as in FIG. 1 are the same. In this embodiment, instead of the synthesizer section 7 in FIG. 1, frequency switching is performed by selecting a plurality of sets of crystal oscillators 16 with a changeover switch 15 using a control signal from a control section 10, and R
441 with multiple microswitches 17 instead of OM12
11. IIQ'' codes are converted into a plurality of sets of frequencies via a plurality of serial/parallel conversion circuits 18.

The difference from the embodiment shown in FIG. 1 is that the signal speed and signal method are set in advance in the control unit 1o, and other operations are performed manually.
Since the process is the same in both cases, the explanation will be omitted.

FIG. 3 shows a block diagram according to another embodiment of the present invention, in which the same numbers and symbols as in FIG. 1 are the same. In this embodiment, the selection of the crystal oscillator 16 for frequency switching and the selection of the decoder 9b for switching the signal speed and signal system are all performed manually by operating the changeover switches 15 and 9a. In this case, since the microprocessor of the control unit is not controlling, automatic switching cannot be performed, but other operations are the same as in the embodiments described above.

In the case where a pager subscriber in area A shown in FIG. 4 subscribes to a pager in area B using the above-mentioned radio paging receiver of the present invention and can receive service from any area, manually, For each automatic case, we will explain how to use it.

(1) In the case of manual switching (a) If the person carrying the receiver was at point 1 in area A, the person would sense from the geography that it was area A, and operate the manual changeover switch 11 on the receiver. and switch to the frequency, signal speed, and signal system of area A. In addition, the person carrying the
Control unit 1 confirms that it is within the service area of region A.
Speaker 13 or light emitting diode 14 with a signal from 0
The ringing fork can be recognized by its luminescence. This determines whether a signal is inside or outside the area based on the electric field strength of the received wave, pit error rate, and synchronization state.

(b) When the receiver carrier moves to point 2 in area B, the carrier recognizes that it is outside the service area of area A by operating the manual changeover switch 11 to check whether it is inside or outside the area, and then switches the manual changeover switch. 11, the frequency, signal speed, and signal system are switched to those compatible with Area B.

(2) In the case of automatic switching (a) If the person carrying the receiver turns on the power switch of the receiver at area A point 1, then the controller 10 (microprocessor) of the receiver is set in the ROM 12. frequency,
The control unit 10 takes in the information on the signal speed and signal system, first switches to the frequency, signal speed and signal system of the first channel and waits, and then determines whether it is in area A based on the electric field strength of the received wave, pit error rate, and synchronization state. is determined.

If the channel is not from area A, the control unit IO sequentially switches the frequency according to the control signal, and if there is a corresponding channel, stops there and waits for the calling signal. Additionally, the receiver constantly monitors the electric field strength, pit error rate, and synchronization status of the received waves.

(b) When the carrier moves to point 2 in area B, the receiver recognizes that it is outside the service area based on the field strength of the received wave from area A, the pit error rate, and the synchronization state,
As in section (a), the channels are switched sequentially according to the settings in the receiver ROM, stopping at the channel corresponding to the frequency, signal speed, and signal system of area B, and entering the standby state.

(Effects of the Invention) As explained above, according to the present invention, it can be used in multiple radio calling areas with different frequencies, signal speeds, and signal systems, so basically there is no need to change the base station equipment. It becomes possible to provide services in multiple areas economically, and the range of activities of subscribers is greatly improved.

Furthermore, since there is a function that allows the person carrying the pager to check whether or not the receiver can be used (inside or outside the service area) at the location, there is no need to worry about whether or not there is a call, increasing the convenience of the pager.

[Brief explanation of the drawing]

FIGS. 1 to 3 are block diagrams of each embodiment of the present invention, and FIG. 4 is an example of the use of the multi-area radio paging receiver of the present invention. IA, IB...Telephone station, 2A, 2B...Base station, 3...Receiving antenna, 4...High frequency tuning circuit,
5... High frequency amplification section, 6... Mixer (MIX),
7...Synthesizer section, 8...Intermediate frequency section, 9.
... Decoder section, 9a, 15... Selector switch, 9b
...Decoder, 10...Control unit, 11...Manual changeover switch, 12...ROM, 13...Speaker,
14...Light emitting diode (LED), 16...Crystal oscillator, 17...Micro switch, 18 Series/parallel conversion circuit. Patent applicant Nippon Telegraph and Telephone Corporation

Claims (1)

[Claims] means for presetting a frequency, signal speed, and signal system in a receiver corresponding to each wireless region; means for selecting a variable local oscillator section for switching a frequency corresponding to the wireless region; 1. A radio paging receiver comprising a decoder section selection means for switching signal speed and signal system.