JPS63290026A - Radio paging system - Google Patents

Abstract

PURPOSE:To reduce the rate of unreceived information by storing previously a data word, which could be correctly received by a word unit, among the data word, which a receiver side received plural times, and combining those. CONSTITUTION:At the time of the reception of a selective paging signal, when an error is detected in the data word, only the data word, in which the error was not detected, is stored previously, and at the point of time that all the data words are correctly received by receiving the data word, which could not be correctly received at the previous reception, at the time of the subsequent reception of the selective paging signal, a paging operation is executed. Thus, because even if an information quantity to transmit is large, the rate of the unreceived information can be reduced, the radio paging system of a high function can be easily realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a so-called high-performance radio paging system that is capable of transmitting information using numbers and the like in addition to paging only by ringing.

[Conventional technology]

In the radio paging system, bit errors may occur due to the influence of radio wave propagation characteristics and the like.

This may result in a missed call, in which a call is not made because the calling number word for itself cannot be received correctly, or a missed call, in which a call is not made because the calling number word for itself cannot be received correctly, or information not received, which occurs because the data word cannot be received correctly.

Furthermore, even though a calling number has been sent to another receiver, it may be mistakenly received as its own calling number, or there may be erroneous reception in which the data word is mistaken.

For this reason, in conventional radio paging systems, as a countermeasure against not receiving information if there is no call, the transmitting station sends a selective paging signal multiple times for one paging, and the receiver selects one of these signals.
If the call is received correctly even once, the call operation is performed to increase the call probability.

In addition, by transmitting a calling number word and data word encoded with an error correction detection code such as a BCH code, and by correcting errors up to a predetermined number of digits at the receiver, measures against missed calls and information failure can be prevented. In addition, countermeasures against erroneous reception are implemented by detecting errors up to a separately determined number of digits.

[Problems to be solved by the invention] As mentioned above, in the conventional radio paging system, the transmitting station transmits a selective paging signal multiple times for one paging, and the information is not attached with an error correction code. Measures were taken to prevent erroneous reception.

Therefore, the conventional radio paging system has a relatively low bit error rate (and if the selective paging signal length is also relatively short, there are no calls,
The probability of information not being received or incorrectly received could be kept low.

However, when trying to increase the amount of information to be transmitted,
As the number of data words increases, even if the bit error rate is the same, there are more cases in which all data words cannot be correctly received at once, resulting in a problem that the information non-reception rate increases.

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide a technology capable of reducing the information non-reception rate in high-performance radio paging system-2 that uses a large number of data words.

[Means for solving problems]

According to the invention, the above-mentioned object is achieved by the means specified in the claims.

In other words, the present invention makes use of the function used in the conventional radio paging system to send multiple signals for one call, and the receiver side correctly checks data words received multiple times on a word-by-word basis. Remember what you received,
By combining them, the probability of not receiving information is reduced.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the configuration of a receiver used in the radio paging system of the present invention, in which 1 is RF@, 2 is a demodulator, 3 is a call number word decoder, and 4 is a call number. Reference numeral 5 indicates a calling number ROM, 6 a control section, 7 a data word decoding section, 8 a data temporary storage memory, 9 a data storage memory, and 10 a data display section.

As shown in FIG. 2, the signal sent from the transmitting station is composed of repeating frames 11 and 11.
is a synchronization signal 12 and a plurality of (for example, m) selective call signals 1
3, the selective call signal 13 is a call number word 14
and, for example, the information word 15 is composed of three words,
It is assumed that the selective call signal is repeatedly sent out a predetermined number of times (for example, 1@) for one call.

That is, the same signal is repeatedly transmitted from frame 1 to frame n. The contents of each information word in one selective call signal are all different. That is, according to this signal configuration, message data consisting of three information words can be transmitted to m@ subscribers in one group. Furthermore, since a check pit is added to each word, error correction and detection can be performed for each word.

The receiver receives a signal sent from a transmitting station by an RF section 1 and an uplink demodulating section 2, and demodulates the signal.

Of course, since it is normally intermittent reception, the power is turned on only when the own group is open. This is done by receiving a synchronization signal.

Among the received signals, for each selective calling signal, the calling number decoding section first performs error correction and detection on the calling number word 14, and when this word is correctly received, the result and the contents of the calling number ROM 5 are corrected and detected. If the two match, it is determined that the call is to itself, Nll+L, and the data word decoding section 7 is activated through the control section 1.

If the call number word is not received or the contents are compared and the two do not match, it is determined that the call is not for the user and the data is discarded.

The data word decoding unit 7 sequentially decodes the three information words 15 in the order in which they are received, performs error correction and detection, and stores the information words in the data temporary storage memory 8 when correctly received. Furthermore, if an error is detected and the information word cannot be received correctly, that information word is discarded. In other words, each of the three information words is checked for errors, and only the information word that has not been received is discarded.

Next, the control section 6 receives one selective call signal, and upon completion of the signal, checks the contents of the temporary storage memory 8 and confirms that all information words (three in this case) have been correctly received and are stored in the temporary data storage memory 8. If so, the received data is transferred to the information word data storage memory 9 and retrieved, and the received data is displayed.

On the other hand, if all the information words are not correctly received in the −th selective call signal reception, if the same call number is correctly received again in the next frame, the subsequent received selective call The words in the signal are decoded and the information words are stored in temporary storage memory or discarded as described above.

As a result, either the first or second correctly received information word will be stored in the temporary storage memory. The subsequent operation is the same as the first reception; if all the information words of this selective call signal are received correctly, the call operation will start at that point, and even if a predetermined number of frames are received, only one selective call will be performed. If all the information words in the signal cannot be correctly received, the selective calling signal is deemed not to have been received and no calling operation is performed.

In other words, in the present invention, when calling m subscribers to one group, transmission is performed over multiple frames, and the receiver receives the information word for its own calling number and performs an error check, so that all the information words are If it is correctly received, a call is made, but if any information word is not received, the corresponding information data in the corresponding selective call signal of the next frame is received, and if it is received correctly, the call is made. Since it is assumed that all information data has been received, a kind of time diversity is achieved and reliability is improved.

On the other hand, since the receiver operates as described above, if another call to the same subscriber (calling number) is sent in consecutive frames, the data of the two calls may be mixed.

In other words, if the calling number of the first frame can be received, the next two frames can be processed by repeating the same data, but if the calling signal of the first frame is not received, then, for example, the third calling number is received. When done,
Since the next frame is different data, if the corresponding selective call signal of that frame happens to be a call to the same subscriber, it is treated as repeated data of the previous frame. If you do so, you will make a mistake.

There are various methods to prevent this, but for example, a restriction may be placed on consecutive calls to the same call number using the encoding device that controls the transmission of selective call signals on the transmitting station side.

That is, in the case of one call and n-time signal transmission, it is conceivable to impose a restriction so that the signal is not transmitted for n−i frames after one call ends. An example of the configuration of an encoding device that realizes this is shown in FIG.

In the same figure, 21 is a waiting buffer that stores a selective calling signal waiting to be sent out, 22 is a sending buffer that stores a selective calling signal n frames after the start of sending (a sending buffer, and 23 is a sending buffer that sends a synchronization signal and also stores a selective calling signal). 24 is an input control unit that controls writing of the selective call signal from the waiting buffer 7 to the sending buffer, and 25 is an input control unit that sequentially reads out and transmits the selective call signal from the waiting buffer 7. After the sending is completed,
It represents an input restriction buffer that stores the selective call signal that has been sent out in the n-1 frame.

In the conventional encoding device, the selective call signal that has been sent out is discarded, but in this encoding device, it is transferred and stored in the input limiting pad 7a for n-1 frames.

In the input control unit, when there is a free space in the sending buffer and it is necessary to control writing from the waiting buffer to the sending buffer 7, the input control unit checks the contents of the sending buffer 7 upstream input restriction buffer and selects the buffer for writing. If there is a call number that is the same as the call number of the call signal, writing of that selective call signal is canceled and the call number is left in the waiting buffer 7 so that it will be written again from the next frame onwards.

Because of this operation, two types of selective calling signals for the same calling number are not sent out simultaneously within n consecutive frames.

Therefore, even if the receiver waits to receive a data word for n consecutive frames after receiving one selective call signal, it will not mix two types of selective call signals.

Alternatively, two bits can be added to the calling number word to represent the repeating number.

In other words, when sending 3 frames, the first frame has the "calling number"1'1', the last frame has a calling number word like "calling number"+'3', and this frame number is detected. , art until the third frame
It is also possible to treat it as return data.

〔Effect of the invention〕

As explained above, according to the system of the present invention, in a radio paging system, even when the amount of information to be transmitted is large, the information non-reception rate can be reduced. This has the advantage that a functional wireless paging system can be easily realized.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of the configuration of a receiver used in the radio paging system of the present invention, PIS Fig. 2 is a diagram showing an example of a signal to be sent, and Fig. 13 is a code used in the radio paging system of the present invention. FIG. 2 is a block diagram showing an embodiment of the N4 power conversion device. 1...RF section, 2...Demodulation section, 3...Calling number word decoding section, 4
・・・・・・Calling number verification unit, 5 ・・・・・・
ROM for calling number, 6... control unit,
7...Data word decoding unit, 8.
...temporary data storage memory, 9...
...Data storage memory, 10 ...Data display section 11 ...Frame, 1
2...Synchronization signal, 13...
Selective calling signal, 14...Calling number word, 15...Information word, 21
・・・・・・Meeting buff 7, 22 ・・・・
...Send buffer 7, 23 ...Transmission control section, 24 ...Input control section, 25 ...
... Input control buffer agent Patent attorney Takashi Honma Figure 3

Claims (2)

[Claims] (1) The transmission signal from the transmitting station is composed of repeating frames consisting of a synchronization signal and a selective call signal, and the selective call signal is composed of a call number word and a plurality of data words to make one call. In a radio paging system that sends a selective paging signal multiple times to a user, if an error is detected in a data word when receiving a selective paging signal, only the data word for which no error was detected is stored, and subsequent selective paging is performed. A radio paging system characterized in that when receiving a signal, data words that could not be received correctly in previous receptions are received, and a paging operation is performed when all data words are correctly received. (2) The radio paging system according to claim (1), in which, on the transmitting side, other calls to the same calling number are not sent for a predetermined number of frames.