JPH02206926A - Multi-channel radio call receiver - Google Patents

Abstract

PURPOSE:To improve the radio call serving by switching to other channel when a frame synchronizing signal of a radio call signal sent in multi-channel from a base station is not detected and receiving the radio call signal. CONSTITUTION:The receiver consists of an antenna 1, a high frequency amplifier 2, a mixer 3, a synthesizer 4, an intermediate frequency amplifier 5, a detector 6, a control section (CPU) 7, a read only memory(ROM) 7a, an alarm controller 8, an LCD driver 9 and a channel display device 9a. When a frame synchronizing signal of a call signal sent in multi-channel from the base station is not detected, the channel is switched to another channel to receive the call signal. Thus, the call signal of a channel having a large electric field strength is received to improve the radio call service.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a multi-channel radio paging receiving device that selectively switches and receives radio signals of a plurality of channels from a radio base station to call a user.

BACKGROUND TECHNOLOGY In general, this type of multi-channel radio calling involves dividing one pre-assigned service area into multiple regions.
A radio base station is installed in each region, and this radio base station switches between a plurality of channels and transmits a radio paging signal to a multichannel radio paging receiver located in the region.

In this case, radio base stations in adjacent service areas are each configured to transmit paging signals on channels with different frequencies in order to prevent crosstalk and interference.

This type of multi-channel radio paging device is carried by a user and used as a mobile station, and when it receives a paging signal of a predetermined channel from a radio base station in its own service area, it emits a buzzer, vibrates, and displays a message. The system is configured to notify the user of the incoming call.

Problems to be Solved by the Invention However, in the above multi-channel radio paging receiving device,
Since the device is configured to receive a paging signal of a predetermined channel from a radio base station located in the service area, it is possible to prevent the user from moving to another service area or from being located in the service area. Even if the call signal from the radio base station does not reach the user even if the call signal from the radio base station reaches the user, for example, if the user moves behind a pill store or to an underground mall, the call cannot be received.Therefore, there is a problem that the radio call service is poor.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a multi-channel radio paging receiving device that can improve radio paging services.

Means for Solving the Problems In order to achieve the above object, the present invention has a method of receiving a paging signal by switching to another channel when a frame synchronization signal of a paging signal transmitted from a base station on multiple channels is not detected. This is how it was done.

According to the present invention, with the above-described configuration, it is possible to receive a paging signal of a channel with a high electric field strength, thereby improving the radio paging service.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a multi-channel radio paging receiving device according to the present invention, and FIG. 2 is an explanatory diagram showing data set in the multi-channel radio paging receiving device of FIG. 3
1 is a flowchart for explaining the operation of the multi-channel radio paging receiver shown in FIG. 1, FIG. 4 is a schematic configuration diagram showing a system in which the multi-channel radio paging receiving device shown in FIG. is a flowchart for explaining the operation of the terminal station in FIG. 4, FIGS. 6 and 7 are explanatory diagrams showing a paging signal transmitted from the base station in FIG. 4, and FIG.
FIG. 8 is an explanatory diagram of the calling signal of FIG. 7;

First, a system in which this multi-channel radio paging receiver is used will be explained with reference to FIGS. 4 to 8.

In FIG. 4, 30 is a subscriber telephone that calls the multi-channel radio paging receiving device shown in FIG. a terminal station that performs radio paging control when the multi-channel radio paging receiving device is called via the terminal station 33;
1-33. are base stations installed in the calling areas A1 to A, respectively, and transmit radio paging signals under the control of the terminal station 32.

The terminal station 32 has a time slot set in advance for each paging area for each multi-channel radio paging receiving device number, and
As shown in the figure, when the subscriber telephone 30 calls the multi-channel radio paging receiving device via the telephone office 31 (step 41), the pre-stored calling number, calling area, and time slot for each area are read out. Step 42)
A paging signal is sent to each base station 331-338.

Here, the number of the receiving device is as illustrated in FIG.
Grouped into groups of 4,000 (Group 61 to G1)
．． ), are allocated to be able to call up to 60,000 receiving devices in a wide coverage area A with calling areas A1-A1.

And base stations 331-33. As shown in FIG. 7, in order to prevent crosstalk and interference, the paging signals are transmitted on multiple channels F1 and F2- with different frequencies, and the paging signals are sent to different groups G1 to F2- for each channel. Gzs number corresponds to each time slot TSI~TS
15, and as shown in FIG. 8, a frame synchronization signal and an area number indicating service area A are added to each frame and transmitted.

Incidentally, as shown in FIG. 7, in the case of another service area B, a paging signal in the same frequency band (channels F1, F, . . . ) as in the service area A is similarly transmitted.

Next, returning to FIG. 1, the configuration of the multi-channel radio paging receiver according to the present invention will be explained.

In FIG. 1, 1 is a built-in antenna for receiving radio signals from base stations 331 to 333, 2 is a high-frequency amplification unit that amplifies the high-frequency signal received by the built-in antenna 1, and 3 is a high-frequency amplification unit 2. 5 is an intermediate frequency amplifier that amplifies the intermediate frequency signal from the mixer 4, and 6 is a signal from the intermediate frequency amplifier 5. This is a detector that detects low frequency signals from low frequency signals.

The frequency synthesizer 4 has a read-only memory (ROM) 7 in order to selectively receive multi-channel (for example, several hundred channels) wireless signals from a wireless base station for each channel.
The local oscillation frequencies for n channels stored in advance in H are output to the mixer 3 under the control of the control unit (CPU) 7,
Further, the control section 7 controls the entire multi-channel radio paging receiving apparatus as shown in FIG.

As shown in FIG. 2, the ROM 7H stores in advance n channels for receiving a calling signal, a time slot for each channel, a calling number, and a service area code.

8 drives a speaker 8a under the control of the CPU 7 to emit a ringtone, and a green (R) LED 8 when a call is made.
This is an alarm controller that causes the LED 8C to blink or lights up the red (R) LED 8C when the frame synchronization signal of the paging signal from the base station is not received.

9 is a CD driver for driving the channel display 9a, 10a is a reset switch (R3-3W) for stopping the call display and buzzer sound, and 10b is a channel switch for switching the channel of the call signal. switch(
CH-3W), IOC is a power switch.

Next, the operation of the above embodiment, particularly the operation of the control section 7, will be explained with reference to FIG.

In step 11, all channel numbers stored in the ROM 7a are read out, and in step 12, the local oscillation frequency of the synthesizer 4 is controlled by the first number of the channel numbers, and the standby device receives a call signal for that channel.

In step 13, the signal from the detector 6? It is decoded to determine whether or not a frame synchronization signal of the calling signal is detected. If a frame synchronization signal is not detected, the process proceeds to step 14. If the counter T1 does not time up, the process returns to step 12, and if the time has elapsed, step 1
Proceed to step 5.

Note that this counter T1 is only used to establish a frame for one channel, and is set to approximately 1 degree as an example.

On the other hand, when a frame synchronization signal is detected in step 13, the process branches to step 20, and by comparing the area number following the frame synchronization signal with the service area code stored in the ROM 7a, it is determined whether or not the area can receive the calling service. Determine whether

If another service area code is detected, proceed to step 21, start the counter Tt, and time amplifier (
(about 20 seconds), the process returns to step 20, and when the time is up, the process proceeds to step 15.

In step 15, the frequency synthesizer 4 is controlled to receive the calling signal of the frequency of the next channel, and the ROM
The above process is executed for the n number of channels preset in 7a (steps 16→12).

When the above processing is executed for n channels, the process proceeds to step 17, and by controlling the LCD driver 9, "0" indicating that all assigned channels are unreceivable is displayed on the channel display 9a. At the same time, the LED 8C blinks.

In the following step 18, the counter T is activated and when the counter T3 times up (approximately 1 to 5 minutes), the process proceeds to step 19, and all counters T1, T2, 'rsf!
: Clear, stop the above display "0", and return to step 11.

At this time, in step 12, the first number in the ROM or the latest channel frequency number for which the registration area has been recognized is set.

Therefore, according to the above embodiment, if the frame synchronization signal of the paging signal of the channel assigned to the user is not received from the base station in the own service area, a warning is issued to that effect, so that the user can For example, if you move behind a building or to an underground mall where the call signal from the wireless base station does not reach you even if you are located in the service area, the call ratio signal does not reach your own service area. You can receive calls by moving to the desired location.

On the other hand, if the own service area code is detected in step 20, the process branches to step 22, and the ROM 7a
The LCD driver 9 and the channel display 9a are read out from the stored time slot of the channel, and the LCD driver 9 and the channel display 9a are controlled to display the channel number.
1.T! , T, and waits for a call based on the calling number.

In step 25, when the own calling number is received, the process proceeds to step 26, and the speaker 8af! : Make it ring,
Alarm controller 8 so that LED 8b blinks.
control.

In the subsequent step 27, if the ringing time has expired or the reset switch 10a is operated, the process advances to step 28, where the ringing is stopped and the process returns to step 11.

In the above embodiment, the number "0" is continuously displayed to indicate that reception is not possible.
The warning may be given using a tone or the like.

As described in detail, in the present invention, when a frame synchronization signal of a radio paging signal transmitted from a base station on multiple channels is not detected, the radio paging signal is received by switching to another channel. Therefore, it is possible to receive a paging signal of a channel with a high electric field strength, and therefore, it is possible to improve the wireless paging service.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a multi-channel radio paging receiving device according to the present invention, and FIG. 2 is an explanatory diagram showing data set in the multi-channel radio paging receiving device of FIG. 3 is a flowchart for explaining the operation of the multi-channel radio paging receiver of FIG. 1, FIG. 4 is a schematic configuration diagram showing a system in which the multi-channel radio paging receiver of FIG. 1 is used, and FIG. The figure is a flow chart for explaining the operation of the terminal station in Figure 4, and Figures 6 and 7 are for explaining the operation of the terminal station in Figure 4.
Explanatory diagram showing a paging signal transmitted from the base station in Fig. 8.
The figure is an explanatory diagram of the calling signal of FIG. 7. DESCRIPTION OF SYMBOLS 1... Antenna, 2... High frequency amplifier, 3... Mixer, 4... Synthesizer, 5... Intermediate frequency amplifier, 6... Detector, 7... Control unit (CPU), 7a・
... Read only memory (ROM), 8... Alarm controller, 9... LCD driver, 9 a.
...Channel indicator (warning means). Figure 1 Name of agent Patent attorney Shigetaka Awano and 1 other person Figure ω Service area 69 receiving number Figure Figure 1

Claims (2)

[Claims] (1) means for selectively receiving radio paging signals transmitted from a base station in multiple channels for each channel; means for detecting a frame synchronization signal of a radio paging signal of a channel received by the receiving means; and the detection and means for controlling the receiving means to receive a radio paging signal of another channel when the means does not detect a frame synchronization signal. (2) If the detection means does not detect frame synchronization signals of all preset channels, a warning is issued to that effect and the frame synchronization signal is set to the latest channel in which the frame synchronization signal was detected. 1) The multi-channel radio paging receiving device described above.