JPH09233520A - Radio call receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sensitivity of reception even when there is any uncorrectable error in address information. SOLUTION: A control part 5 stores address information and message information in a 1st storage device 7, performs an information assembling operation to both the information and retrieves later whether its own address information set to an ID-ROM 4 is included in that assembled information or not and when it is retrieved, message information corresponding to that address information is displayed on a display part 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio paging receiver which corrects a reception error by repetitive transmission, and more particularly to a radio paging receiver having a high error correction capability and a high reception sensitivity.

[0002]

2. Description of the Related Art The principle of error correction technology of error correction code is
When the coding is performed so that the Hamming distance between the codes is sufficiently large, error correction is possible. Therefore, if the number of errors occurring is large compared to the magnitude of the Hamming distance, the errors cannot be corrected. In this case, you can only detect errors,
Only the number of error occurrences is known.

A conventional radio paging receiver will be described with reference to FIG. FIG. 2 is a block diagram of a conventional radio paging receiver. As shown in FIG. 2, a conventional radio paging receiver includes an antenna 1, a receiving unit 2, a decoder unit 3, and an I.
It is composed of a D-ROM 4, a control unit 5, a display unit 6, a first storage device 7, and a second storage device 8.

Here, the signal received by the radio paging receiver is composed of two frames as shown in FIG. 3, and each frame includes a first synchronization signal (S1) and a second synchronization signal. (S2) and the first information slot (L1)
And a second information slot (L2). FIG. 3 is an explanatory diagram showing a state of a signal received by a radio paging receiver that corrects a reception error by repeated transmission.

Each signal will be described. The first synchronizing signal S1
Is a signal for indicating a frame delimiter. The second synchronization signal S2 includes information for identifying the receiver, and due to the battery saving operation, only the identified receiver receives the subsequent slots L1 and L2.

The slot L1 and the slot L2 include address information (AD) and message information (MS). The address information and the message information are repeatedly received (received multiple times), that is, they are included in the first frame and the second frame and are received twice. The address information and the message information can be discriminated according to which slot they are included in.

Specifically, the slot L1 of the first frame
Contains the first address information (AD1) and the first message information (MS1), the slot L2 contains dummy information, and the slot L1 of the second frame contains , Dummy information is slot L2
Contains the second address information (AD2) and the second message information (MS2).

The address information AD and the message information MS have addresses A (adrA), B (adrB), and C, respectively.
For the three receivers identified by (adrC) and
The corresponding messages A (msgA) and B (msg
B) and C (msgC) are transmitted, as shown in FIG. 3, adrA, adrB, adrC, msgA, and msgB.
And msgC are sent in this order.

Although the frame is transmitted twice in order to simplify the description, the number of frames transmitted may be twice or more. In that case, there are as many slots as there are n frames,
In the kth transmission, only the kth slot includes address information (ADk) and message information (MSk), and the other slots are filled with dummy information.

The error correction code added to each address information and message information will be described. The address and message are divided into units of a certain number of bits (hereinafter, referred to as word units), and An error correction code is added to each word. In addition, an error correction code for each frame may be added.

Next, the function of each part will be specifically described. The receiver 2 is a detection and demodulation circuit, and outputs the signal from the base station received via the antenna 1 to the decoder 3. The decoder unit 3 decodes the input signal into decoded data and outputs the decoded data to the control unit 5. The ID-ROM 4 stores unique address information.

The control unit 5 receives the decoded data from the decoder unit 3 and, if the address information stored in the ID-ROM 4 and the address information of the decoded data match, corresponds to the address information. A message assembly operation is performed on the message information to be reproduced, the message is reproduced, and the message is output to the display unit 6.

The message assembling operation of the controller 5 will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the control unit 5 of the conventional radio paging receiver. The control unit 5 has a work memory (not shown), and the work memory initially stores dummy data.

The control unit 5 receives the decoded data corresponding to the first frame from the decoder unit 3 and detects the number of repetitions from the position of the slot containing the address signal and the message signal (101). ). For example, the second
If the slot 1 contains the address signal and the message signal, it is determined that the slot is the second transmission.

Then, the control unit 5 extracts address information and message information from the input decoded data, stores them in the first storage device 7 (102), and stores them in the first storage device 7. The error correction is performed on the address information and the message information (103). Then, the address information stored in the ID-ROM 4 is referred to, and it is determined whether or not there is one that matches the address information stored in the first storage device 7 (104).

If there is no match (N
If it is o), the process proceeds to a process 107 described later. Also,
In process 104, if there is a match between the address information stored in the first storage device 7 and the address information stored in the ID-ROM 4 (if Yes),
The contents of the work memory are compared with the number of errors detected for each word unit in the process 103 (10
5).

If the content of the work memory is dummy or the value stored in the work memory corresponding to the word unit is larger than the number of detected errors, the detected error is detected. The number of errors is stored in the work memory, and the error-corrected word unit is overwritten and stored in the corresponding portion of the second storage device 8 (106).

In the process 105, if the value stored in the work memory corresponding to the word unit is smaller than the number of detected errors, the work memory,
The contents of the second storage device 8 are left unchanged.

Then, it is judged whether the number of times detected in the process 101 has reached the number of times of repetition designated in advance (107). If the number of times has been reached, the contents of the second storage device 8 are displayed on the display unit 6. Output (108). Processing 1
In 07, if the detected number of times has not reached the number of repetitions designated in advance, new input of decoded data is received, and the process returns to step 101.

Further, although not shown, in the process 103, when the number of errors is "0" for all word units and the address information matches the address information stored in the ID-ROM 4. Processing is stopped at that point and the message information is stored in the second storage device 8
The content of the second storage device 8 may be output to the display unit 6.

Next, the operation of the message assembling process of the conventional radio paging receiver will be described by taking the case where the address information stored in the ID-ROM 4 is adrB as an example. First, the receiving unit 2 receives a signal as shown in FIG. 3 via the antenna 1, the decoder unit 3 decodes the signal, and the control unit 5
Output as decoded data to.

At this time, although adrB of the address information AD1 is destroyed to the extent that an error cannot be corrected, msgB of the message information MS1 is normally received, and adrB of the address information AD2 is normally received. However, it is assumed that msgB of the message information MS2 is destroyed to the extent that it cannot be corrected.

Then, the control unit 5 stores the address information AD1 of the first frame and the message information MS1 in the first storage device 7 and corrects the errors respectively, and ID-RO
It is searched whether address information matching the address information stored in M4 exists in AD1. However, since the address information AD1 is destroyed to the extent that an error cannot be corrected, the control unit 5 processes the second frame without storing the message information MS1 in the second storage device 8.

Then, the control unit 5 controls the ms of the address information AD2 and the message information MS2 included in the second frame.
gB is stored in the first storage device 7 and the error is corrected. At this time, msgB of the normally received message information MS1
Is discarded by overwriting.

Then, the control unit 5 stores the number of errors contained in msgB of the message information MS2 stored in the first storage device 7 in the work memory for each word. Then, since the address information stored in the ID-ROM 4 and the adrB of the address information AD2 match and the contents of the work memory are dummy, the msgB of the message information MS2 corresponding to the address information is stored in the second storage device. 8
To be stored. Then, when the designated number of times of repetition, for example, two times has been reached, a message containing an error is output to the display unit 6.

[0026]

As described above, in the above conventional radio paging receiver, when the address information has an error that cannot be corrected, the message information corresponding to the address information is discarded. Therefore, there is a problem that the number of message assembling operations is reduced and the reception sensitivity is deteriorated.

The present invention has been made in view of the above situation, and the number of message assembling operations is substantially maximized by performing the information assembling operation on the address information and the message information and then searching the address information. It is an object of the present invention to provide a radio paging receiver that can improve reception sensitivity.

[0028]

The invention according to claim 1 for solving the above-mentioned problems of the prior art is, for information to which an error correction code is added in word units of a certain number of bits,
The same information is repeatedly transmitted, and information is assembled by combining words having the smallest number of errors for each word from a plurality of received information, and the address information corresponding to the self-set address information is assembled. Search from the information
If it is searched, the message information corresponding to the address information is displayed, and the number of message assembling operations can be practically utilized to the maximum, and the address information is also corrected by the information assembling operation. Therefore, the reception sensitivity can be increased.

In order to solve the problems of the above-mentioned conventional example, the invention according to claim 2 is a radio paging for repeatedly receiving transmission of the same information for information to which an error correction code is added in word units of a fixed number of bits. A receiver unit that outputs information received via an antenna as demodulated data, and an ID that stores address information set therein
After performing an information assembling operation on the ROM and the demodulated data, the address information stored in the ID-ROM is searched from the information assembled information, and if found, a message corresponding to the address information. A control unit that outputs information, a display unit that displays the message information input from the control unit, a first storage device that is used for error correction when the control unit performs information assembly, and an information assembly It has a second storage device for storing the result and a work memory for storing the number of corrected errors in word units, and the work memory initially stores a dummy, and the control unit While receiving the same information repeatedly, as the information assembling operation, the address information and the message information are extracted from the decoded data and stored in the first storage device. Error-correcting, comparing the number of corrected errors with the numerical value stored in the work memory in units of words, and the detected number of errors is smaller than the numerical value stored in the work memory, or If the numerical value stored in the work memory is a dummy, the number of errors detected in the first storage device is overwritten and stored in a corresponding position of the work memory, and the error is corrected. Is stored in the second storage device by overwriting the corresponding position in the second storage device, and when the repeated transmission is completed, whether or not the address information set in the ID-ROM is stored in the second storage device. Is searched, and if it is searched, it is a control unit that outputs the message information stored corresponding to the address information to the display unit. The number of assembly operations can be fully utilized, and, since the address information is also corrected by the information assembly operation, it is possible to increase the reception sensitivity.

[0030]

Embodiments of the present invention will be described with reference to the drawings. The radio paging receiver (this device) according to the present invention assembles both address information and message information regardless of the address information, and after the information assembling operation is completed, the address information stored in the ID-ROM is stored. The assembled address information is searched, and if there is a matching address information, the corresponding assembled message information is displayed.

This machine has the same structure as the conventional radio paging receiver shown in FIG. 2, but the message assembling operation in the control section 5 is the information assembling operation including the assembling of the address information. However, they are different.

The control unit 5 of the apparatus receives the decoded data from the decoder unit 3 and performs an information assembling operation on both the address information and the message information to obtain the assembled address information and the assembled message information. If the address information, which is held as a pair and matches the address information stored in the ID-ROM 4, is included in the address information after the information assembling operation, the assembled message information corresponding to the address information is displayed. It is output to the unit 6.

The information assembling operation in the controller 5, which is a characteristic part of the present invention, will be described with reference to FIG. FIG. 1 is a flowchart showing the information assembling operation of the control unit 5 of the radio paging receiver according to the embodiment of the present invention. It is assumed that a dummy is initially stored in the work memory as in the conventional case.

The control unit 5 receives the decoded data from the decoder unit 3 and detects the number of repetitions in the same manner as the conventional method (121). The address information and the message information are extracted from the decrypted data, and they are stored in the first storage device 7
(122). Then, the first storage device 7
The address information and the message information stored in is divided into word units for error correction (123), and the number of errors is compared with the number of errors stored in the work memory for each word (124). .

Then, if the number of errors stored in the work memory is dummy or larger than the number of errors detected in the process 123 (Yes), the detected errors are detected. The number is overwritten and stored in the corresponding position of the work memory, and the word unit whose error is corrected in the process 123 is overwritten and stored in the second storage device 8 (125).

If the number of errors stored in the work memory is equal to or smaller than the number of errors detected in the process 123 in the process 124 (if No), The message information stored in the second storage device 8 is left as it is.

Then, in the process 121, it is judged whether the detected number of repetitions has reached the number of repetitions designated in advance (126). If the number of repetitions has not been reached (if No), the processing from step 121 is repeated for the next frame.

In step 126, if the number of repetitions has been reached (Yes), the error-corrected decoded data stored in the second storage device 8 is
It is searched whether the address information that matches the address information stored in the ID-ROM 4 is included (127), and if it is included, the message is reproduced from the message information corresponding to the address information. Then, it is output to the display unit 6 (128).

If the address information matching the address information stored in the ID-ROM 4 is not found in the processing 127, the data stored in the second storage device 8 is discarded.

Further, although not shown, in the process 123, if the number of errors for all the words is "0", the process is stopped at that point and the message information is stored in the second storage. Second storage device 8 stored in device 8
The content of may be output to the display unit 6.

Next, regarding the operation of this apparatus, although the address information included in the first frame is destroyed to the extent that error correction cannot be performed, the message information is normally received and included in the second frame. An example will be described in which the address information to be received is normally received, but the message information is destroyed to the extent that an error cannot be corrected. still,
The number of repetitions is “2”.

First, the control unit 5 of this apparatus which receives the input of the decoded data of the first frame detects the number of repetitions as "1" from the position of the information included in the frame and includes it in the decoded data. The address information and the message information to be stored are stored in the first storage device 7. Then, the control unit 5
The address information and the message information stored in the storage device 7 are divided into word units, error correction is performed for each word unit, and the result is stored in the second storage device 8. At that time, the number of errors for each word unit is stored in the work memory. Since the address information included in the first frame is destroyed to the extent that error correction cannot be performed, the number of address information errors is large.

The control unit 5 receives the decoded data of the second frame, detects the number of repetitions as "2", and divides the address information and the message information contained in the decoded data into word units. , Error correction is performed for each word unit. Here, since the address information included in the second frame is assumed to be normally received, the number of errors in the address information is a small numerical value, and the message information is destroyed to the extent that error correction cannot be performed. Therefore, the number of error messages is large.

Then, the control unit 5 compares the number of errors in each word unit with the number of errors in the corresponding word unit stored in the work memory, and compares the number of errors stored in the work memory. The address information stored in the second storage device 8 having a large value is replaced by the error-corrected address information stored in the first storage device 7.

Since the number of message information errors in the second frame is larger than the number of message information errors stored in the work memory, the second storage device 8
The message information stored in is retained.

Then, the control section 5 refers to the address information from the ID-ROM 4 because the number of repetitions designated in advance is "2" and the detected number of repetitions is also "2", and the address is referred to. It is searched whether the address information matching the information is stored in the second storage device 8. Then, since the normal address information received in the second frame is stored in the second storage device 8, the address information is retrieved.

Then, the control unit 5 reads the normal message information received in the first frame from the second storage device 8 as the message information corresponding to the retrieved address information, and the display unit 6 Output to. And
Normal message information is displayed on the display unit 6.

According to the radio paging receiver according to the embodiment of the present invention, as information assembling operation, demodulated data received several times is divided into word units, error-corrected and stored. Among them, the word units received in the best condition are combined to obtain error-corrected demodulated data,
Since the address information of its own is retrieved from the demodulated data obtained by the information assembling operation and the corresponding message information is displayed, the number of message assembling operations can be substantially maximized, In addition, since the address information is also corrected by the information assembling operation, there is an effect that the receiving sensitivity can be increased.

[0049]

According to the invention as set forth in claim 1, after the information assembling operation is performed on the entire information which has been repeatedly transmitted, the address information set as the address information of the self is searched and searched. For example, since the radio paging receiver displays the message information corresponding to the address information, the number of message assembling operations can be substantially maximized, and the address information can also be obtained by the information assembling operation. Since it is corrected, there is an effect that the receiving sensitivity can be increased.

According to the second aspect of the present invention, with respect to the information to which the error correction code is added in units of words having a certain number of bits, the same information is repeatedly transmitted, and the decoder section receives it through the antenna. As for the information output as the demodulated data, while the control unit is repeatedly receiving the information, as an information assembling operation, an error is detected and corrected for each word, and stored in the first storage device. Compare the number of detected errors per number with the number already stored in the work memory, and if the number of detected errors is small or the number stored in the work memory is dummy, detect When the number of errors made is overwritten in the work memory, the corresponding word is overwritten in the corresponding position in the second storage device, and the repeated transmission is completed, the ID-ROM
It is searched whether or not its own address information set in is stored in the second storage device, and if it is searched,
Since the message information corresponding to the address information is output to the display unit and the display unit is the radio paging receiver that displays the message information, the number of message assembling operations can be substantially utilized to the maximum, In addition, since the address information is also corrected by the information assembling operation, there is an effect that the receiving sensitivity can be increased.

[Brief description of drawings]

FIG. 1 is a flowchart showing a message assembling operation of a control unit 5 of a radio paging receiver according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram of a conventional radio paging receiver.

FIG. 3 is an explanatory diagram showing a state of a signal received by a conventional radio paging receiver.

FIG. 4 is a flowchart showing the operation of a control unit 5 of a conventional radio paging receiver.

[Explanation of symbols]

1 ... Antenna, 2 ... Reception part, 3 ... Decoder part, 4
... ID-ROM, 5 ... control unit, 6 ... display unit, 7,
8 ... Storage device

Claims (2)

[Claims] 1. For information to which an error correction code is added in units of a fixed number of bits, the same information is repeatedly transmitted, and a plurality of received information is combined with a word having the smallest error number for each word. The information assembling is performed by searching, the address information corresponding to the address information set for itself is searched from the information assembled information, and if the information is searched, the message information corresponding to the address information is displayed. Radio call receiver. 2. A radio paging receiver which repeatedly receives transmission of the same information for information to which an error correction code is added in units of a fixed number of bits, and the information received via an antenna is used as demodulation data. Decoder unit for outputting and ID-R for storing address information set therein
After performing an information assembling operation on the OM and the demodulated data,
The address information stored in the ID-ROM is searched from the information-assembled information, and if searched, the controller outputs message information corresponding to the address information, and the controller input from the controller. A display unit that displays message information, a first storage device that is used for error correction when the control unit performs information assembly, a second storage device that stores the result of information assembly, and A work memory that stores a number of words in a word unit, and the work memory initially stores a dummy, and while the control unit is repeatedly transmitting the same information, information assembly is performed. As an operation, address information and message information are extracted from the decoded data and stored in the first storage device, error correction is performed in word units, and the number of corrected errors is calculated in word units in the word unit. When the number of the detected errors is smaller than the value stored in the work memory or the value stored in the work memory is a dummy as compared with the value stored in the memory. Stores the number of errors detected in the first storage device by overwriting the corresponding position in the work memory and storing the error-corrected word in the corresponding position in the second storage device. When the second transmission is completed, the second transmission is completed.
It is searched whether the address information set in the ID-ROM is stored in the storage device, and if it is searched, the message information stored corresponding to the address information is output to the display unit. A radio paging receiver, which is a control unit.