JPH06224827A - Method for receiving signal of pager - Google Patents

Abstract

PURPOSE: To provide a signal receiving method for pager by which the power consumption of a pager can be saved rationally by performing the detection of a preamble signal prior to the detection of a synchronizing signal. CONSTITUTION: The occurrence of such a case that new frame synchronization is failed, because no time is available for the synchronization, or the detection of a transmitted signal is missed is prevented by detecting whether or not a preamble signal exists during the transmitting period of a frame F6 which is transmitted before the last frame F7 is detected when, for example, the characteristic number of a user belongs to the last frame F7 or by detecting whether or not the preamble signal exists during the transmitting period of the last frame F7 when the characteristic number does not belong to the frame F7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pager.
r) regarding the signal receiving method.

[0002]

2. Description of the Related Art Among the pagers which have been widely used recently, the structure of the pager used in the present invention is schematically shown in FIG.

In the pager of FIG. 3, a radio receiver (Radio Receiver) receives a high frequency signal induced in an antenna, amplifies and demodulates the data signal to generate a data signal, and a circuit for saving a battery. It's wrapped.

The decoder (DECODER) is EEPR
By comparing the data stored in the OM with the received data, the CPU is informed of the result, and the wireless receiver receives a signal from the CPU to control the battery saving operation.

DC / DC is a DC converter (DC-t
It is an o-DC converter and serves to convert the battery voltage so as to be suitable for the CPU and the decoder.

The CPU receives the data decoded by the decoder and controls the display of the liquid crystal display or the photodiode. The CPU also sends a power saving signal to the wireless receiver by operating a speaker or a vibrator to emit a warning sound.

In the pager configured as above, a radio signal to be transmitted is received and amplified by a radio receiving section,
When the demodulated and received data is sent to the decoder, the decoder compares the unique number stored in the EEPROM with the data and informs the CPU whether or not they match, and the CPU performs the necessary operation, that is, an alarm. It operates such as ringing and displaying ignition with a photo diode.

Further, the decoder may operate according to a predetermined program or logic as described below.
It operates to minimize power consumption by turning on and off the power supplied to the wireless receiver.

One of the coding methods of the radio signal transmitted from the conventional pager system is as shown in FIG.
POCSAG (Post Office Code S)
Tandardization Advisory G
A first code for bit synchronization (preamble: Preamble), a second code for byte synchronization (synchronization signal: Sync), and a large number (F0, F2) for transmitting a user unique number. F3, etc.). The POCSAG code system is composed of a first code which is a preamble signal, a second code which is a synchronization signal, and a batch which is composed of eight frames for information transmission. Also, the number of used frames having the user unique number is 8
It belongs to any one of the frames, which is determined to belong to the rest when each user unique number is divided by 8.

This code system transmits at a bit transmission rate of 512 BPS and plays a role of synchronizing bits 576.
A bit preamble signal (first code) is transmitted first, followed by a first code followed by a synchronization code (second code) for synchronizing bytes in 32 bits, and then 6 bits.
A plurality of 4-bit frames are transmitted from the first frame to the eighth frame, and then a batch of the second code and 8 frames is repeatedly transmitted.

A pager for receiving a transmission signal transmitted by such a POCSAG code has a power saving function.
The power of the wireless receiver is turned on for each predetermined period at predetermined times and intervals, and it is checked whether the pager's own unique number is included in the transmitted signal, and the own unique number is transmitted. Upon confirmation, the alarm sound or alarm display means is activated to notify the pager carrier of the calling signal.

Prior art relating to battery power saving is described in US Pat. No. 4,3,1983 dated 1983.1.25.
70,753. The power saving method of the pager is realized by a method in which the power of the receiving circuit portion, which consumes a lot of power, is turned on in a fixed order only for a predetermined time necessary for detecting a transmission signal, and turned off for the remaining period.

The most similar conventional pager signal receiving method related to the present invention is shown in FIG.
In the figure, the horizontal direction represents the time axis, the vertical direction represents ON / OFF of the wireless receiver, the low portion represents OFF of the wireless receiver, and the high portion represents ON of the wireless receiver. .
First, the wireless receiver is turned on, the preamble (first code) is detected in the first period, and the synchronization signal (second code) transmitted next to the preamble code is detected in the second period. Turn off the power of the receiver, and during the third period when the frame with the pager user's unique number is transmitted, for example, if the unique number corresponds to frame 3, only the period during which frame 3 (F3) is transmitted. Then, turn on the wireless receiver, execute signal detection and control, and check whether or not the own unique number is transmitted.

At this time, when the own unique number is transmitted,
As described above, the necessary circuits are operated to generate alarms, vibrations, displays, etc., and if the own unique number is not transmitted, the period during which the synchronization signal and F3 are transmitted to search for the next transmission. Only by turning on the radio receiver, the detection is performed, and the sync signal and the user's unique number are detected.
The detection and control process is repeated in a predetermined manner.

Generally, in the above-mentioned pager signal receiving method, the batch signal is repeated after the preamble signal. , After a certain number of batches are repeated, the batches are repeated starting from the preamble signal again.

In this case, if the transmission of the preamble code starts before the transmission of eight frames, there is no time to adapt to the new frame synchronization in the prior art, and the synchronization may fail or the transmitted signal detection may be missed. Occur.

[0017]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem and enables a reasonable power saving by performing detection of a preamble signal before detection of a sync signal. An object of the present invention is to provide a pager signal receiving method.

[0018]

In the signal receiving method of a pager according to claim 1 of the present invention, a first code for bit synchronization, a second code for byte synchronization and a user unique number transmission. Of a pager that performs a necessary operation by receiving a radio signal composed of a number of frames of, and turning on the radio receiver and detecting the user unique number in the received radio signal only for a predetermined period. With the signal receiving method, (a)
Detecting the first code in the first period until the first code is detected from the received radio signal and synchronizing it with the received first code; and (b) detecting the second code in the second period. A step of synchronizing with the second code, and (c) a step of detecting a user frame in which the user unique number is transmitted in the third period to confirm whether or not there is a unique number transmission
(D) In the fourth period in which the last frame is transmitted, the first
Whether or not the code is transmitted is detected again. If the first code is not detected, go to the next step (b), and if the first code is detected, go to the step (a) and repeat the next step. It is supposed to do.

In the pager signal receiving method according to the second aspect of the present invention, (a) the first code is detected from the received radio signal to the pager for the user whose unique number corresponds to the last frame. Detecting a first code and synchronizing with the first code in a first period until
(B) detecting the second code in the second period and synchronizing with the second code; and (c) whether or not the first code is transmitted in the third period in which the frame immediately before the last frame is transmitted. Again, and if the first code is not detected, go to the next step (b), if the first code is detected, go to step (a), and (d) the fourth frame in which the last frame is transmitted. Check whether the user's unique number is transmitted during the period, and if the unique number is not detected, see (b) above.
It is designed to go to a step and repeat the next step.

[0020]

In the pager signal receiving method according to the present invention,
For example, in the case where the user unique number belongs to the last frame (F7), it is detected whether or not there is a preamble signal in the period in which the frame F6 before the last frame detection is transmitted, and the user unique number belongs to F7. If not, it detects whether there is a preamble signal in the period in which the last frame (F7) is transmitted. Therefore, there is no time to adapt to the new frame synchronization, and synchronization fails, or the transmitted signal is detected. You can never miss out on.

[0021]

1 and 2 are drawings for explaining the method of the present invention. In the same figure, as described in FIG. 5, the horizontal direction represents the time axis, the vertical direction represents ON / OFF of the wireless receiver, the B part represents the OFF of the wireless receiver, and the high part represents This means that the wireless receiver is turned on. In addition, each figure is P
It is shown in association with the OCSA G code system.

FIG. 1 shows the method performed when the user unique number does not belong to the last frame (F7). First, the pager turns on the wireless receiver in the first period indicated by No. 1 and detects whether the first code is transmitted (first step). Next, the synchronization signal (second code) following the first code is detected by turning on the wireless receiver in the second period in which the number 2 is displayed (second step). After that, the wireless receiver is turned on in the third period (for example, F3) displayed by the number 3 to which the own unique number belongs, and the third code is detected to check whether the unique number is transmitted. Yes (third step). Before all the frames (8 frames) are transmitted, the fourth period (for example, F
The radio receiver is turned on in 7) to detect the preamble signal (first code) so as not to miss another batch iteration starting from the preamble signal (fourth step). Fourth
If the first code is not detected in the step, the second code is detected and the second code is transmitted in the second period (displayed by number 2).
To do. That is, 2 steps, 3 steps, and 4 steps are repeatedly performed. The fourth step may be provided in any frame period except the user frame so as not to miss another batch repetition starting from the preamble signal.

FIG. 2 shows the method performed when the user unique number belongs to the last frame (F7). In this method, the pager first detects the first code in the first period indicated by No. 1 (that is, until the time when the first code ends), and when detected, synchronizes its clock with the first code. Allow (first step). Next, the second code (synchronization signal) is detected in the second period indicated by No. 2, and when the second code is detected, the clock is synchronized with the second code (second step). After that, the first code is detected at (F6) in the fourth period indicated by No. 4, which is the time before the last frame transmission, so as not to miss the start of another batch starting from the last preamble (the third). Step). If the first code is not detected in the third step, 3
The signal transmitted during the third period indicated by No., that is, the period during which the last frame is transmitted, is detected to find out whether or not its own unique number is transmitted (fourth step). Next, the second to fourth steps of searching for the second code are repeatedly performed. Even in this case, step 3 may be performed at any frame period other than its own frame (F7) so as not to miss another batch repetition in which the preamble signal starts.

[0024]

As described above, according to the pager signal receiving method of the present invention, the pager system starts with the first code before the transmission of the entire batch frame is completed in an area with a large number of transmission requests. Even if another batch is transmitted, there is no problem in the normal operation of preamble detection, and the transmitted unique number is not missed.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention.

FIG. 2 is a view for explaining another embodiment of the present invention.

FIG. 3 is a block diagram schematically showing a conventional pager.

FIG. 4 is a diagram illustrating a conventional signal receiving method.

FIG. 5 is a diagram illustrating a POCSAG code.

[Explanation of symbols]

 1 1st period 2 2nd period 3 3rd period 4 4th period

Claims (2)

[Claims] 1. A radio signal including a first code for bit synchronization, a second code for byte synchronization, and a number of frames for transmitting a user unique number is received, and a radio receiver is operated for a predetermined period of time. In the signal receiving method of the pager for performing a necessary operation by turning on only and detecting the user unique number in the received wireless signal, (a) the first code is detected from the received wireless signal. Detecting the first code in the first period until time and synchronizing with the first code; (b) detecting the second code in the second period and synchronizing with the second code; A step of detecting a user frame in which the user unique number is transmitted during three periods to check whether or not there is a unique number transmission; (d) the fourth period during which the last frame is transmitted. 1
Whether or not the code is transmitted is detected again. If the first code is not detected, go to the next step (b). If the first code is detected, go to the step (a) and repeat the next step. A method of receiving a pager signal, characterized by: 2. A radio signal including a first code for bit synchronization, a second code for byte synchronization, and a plurality of frames for transmitting a user unique number is received, and a radio receiver is operated for a predetermined period of time. In the signal receiving method of the pager for performing a necessary operation by turning on only and detecting the user unique number in the received wireless signal, (a) the first code is detected from the received wireless signal. To detecting the first code in the first period up to and synchronizing with the first code, (b) detecting the second code in the second period and synchronizing with the second code, and (c) the last The third frame before the frame is transmitted
It is detected again whether the first code is transmitted during the period, and if the first code is not detected, go to the next step (b),
When the first code is detected, (i) step, and (d) it is confirmed whether the user unique number is transmitted in the fourth period when the last frame is transmitted, and the unique number is detected. If not, go to step (b) and repeat the next step.