JPH06216883A - Radio data communication equipment and radio data communication method - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency of a radio channel with bad quality by sending succeeding data whose length is halved upon the receipt of information having an error and whose length is doubled when no error is in existence in the data. CONSTITUTION:A buffer 11 of a data transmission control section 1 stores tentatively data to be sent and a transmission section 12 sends data in the unit of specific message length. Furthermore, upon the receipt of a data NG signal representing a faulty reception status and information representing error data from an error check section 3, a processing section 13' divides a message of erroneous data into two and gives a status to each divided message and sends the resulting data to a transmission section 12, and upon the receipt of a data OK signal representing a normal reception status in the received status from the error check section 3, the processing section 13' restores the length of the message to the length of message before the division and sends the data of the restored length. Thus, when the quality of a radio channel is bad, the message length is decreased to reduce an error occurrence rate and the message length is increased when the quality is recovered to send data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for transmitting and receiving data in a wireless communication line and a data communication method thereof, and more particularly to a wireless data communication device and a wireless data communication method having high transmission efficiency according to the quality of the wireless line. .

[0002]

2. Description of the Related Art First, the configuration of a conventional wireless data communication apparatus will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of a conventional wireless data communication device. As shown in FIG. 4, the conventional wireless data communication device is composed of a data transmission control unit 1 on the data transmission side and a data reception control unit 2 on the data reception side.
Is provided with an error detection unit 3 that performs an error check on the received data and sends the result as a reception status to the data transmission control unit 1.

The respective parts of the conventional wireless data communication device will be described in more detail. The data transmission control part 1 has a buffer 11 for temporarily storing data to be transmitted.
A transmission unit 12 that transmits data in a unit of a specific message length, for example, a unit of a message length of 8 bytes, and reads data in units of 8 bytes from the buffer 11 and sends the data to the transmission unit 12, and also from the error detection unit 3. And a processing unit 13 for reading the erroneous data from the buffer 11 and sending the data to the transmission unit 12 when the reception status is determined to be a (data NG) signal indicating an abnormality. There is.

In addition, the data reception control unit 2 sends the data transmitted by radio to the error detection unit 3, and the data output from the reception unit 22 to the error detection unit 3.
A processing unit 23 that receives a result from the error detection unit 3 and sends normal data to the buffer 21 and a buffer 21 that temporarily stores the normally received data are provided.

The error detection unit 3 receives the received data from the processing unit 23, detects an error in the received data by a general error detection method, and notifies the processing unit 13 in the data transmission control unit 1 of the received status. The state of the received data is output to the processing unit 23 of the data reception control unit 2. The reception status is a signal indicating that data reception is abnormal (data NG) or a signal indicating that data reception is normal (data OK), and further (data NG).
If it is a signal, the information for specifying the erroneous data is also added.

Next, a wireless data communication method in a conventional wireless data communication device will be described with reference to FIGS. 4 and 5. FIG. 5 is an explanatory diagram showing a communication example in the conventional wireless data communication method. In summary, in the conventional wireless data communication method, even if an error occurs in data transmission, the length of one message transmitted at one time does not change, and exactly the same message is retransmitted.

Explaining in detail in the example of FIG. 5, first, the data including the status bit E is sent from the data transmission control unit 1.
(1) Send (G1G2G3G4G5G6G7G8E). Then, the data reception control unit 2 transmits data (G1G2G
3G4G5G6G7G8), and the error detection unit 3
The error check is carried out with, and since the reception was successful, the reception status of (data OK) is returned.

Next, the data (2) (A1A2A3A4A5A6) including the status bit E is sent from the data transmission control unit 1.
A7A8E) is transmitted. Then, the data reception control unit 2
Receives the data (A1A2A3BA5A6A7A8), and the error detection unit 3 performs an error check.
Therefore, a reception data error is detected, and a reception status of (data NG) indicating an abnormal reception is returned.

Then, the data transmission control unit 1 transmits the data (2) (A1A2A3A4A5A6A7A8E) again, and this time the data reception control unit 2 transmits the data (A1A2A3).
A4A5A6CA8) is received and the error detection unit 3 performs an error check. Since A7 is C, a reception data error is detected again, and a reception status of (data NG) indicating reception abnormality is returned. .

Then, the data transmission control unit 1 transmits the data (2) (A1A2A3A4A5A6A7A8E) again, and the data reception control unit 2 transmits the data (A1A2A3A4).
A5A6A7A8) is received, the error detection unit 3 performs an error check, and the reception status of (data OK) is returned because the reception was successful. In this way, wireless data communication has been performed.

[0011]

However, in the above-described conventional wireless data communication apparatus and wireless data communication method thereof, even if a transmission error occurs, a message having exactly the same message length is retransmitted, so that the quality is poor. There is a high probability that a transmission error will occur again in the wireless line, and if the same message is to be transmitted many times, the transmission efficiency will be extremely poor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless data communication apparatus and a wireless data communication method capable of improving transmission efficiency over a wireless line of poor quality.

[0013]

The invention according to claim 1 for solving the problems of the above-mentioned conventional example is a data transmission control section for controlling data transmission, and a data reception control section for controlling reception of data. And a wireless data communication device having an error detection unit that detects an error in data received by the data reception control unit and notifies the data transmission control unit of the data, and stores data for transmission in the data transmission control unit. It is erroneous when the first storage unit to be stored, the transmission unit that transmits the data extracted from the first storage unit in units of a specific message length, and the error information notified from the error detection unit are received. If there is no error, the message length of the data to be transmitted next is divided into 1/2 and the message length of the data to be transmitted next is calculated within the range of the specific message length unit. Double the size and send to the transmitter A first processing unit for receiving the transmitted data in the data reception control unit, a second storage unit for accumulating error-free data, and the received data for each message. And a second processing unit for sending to the second storage unit error-free data based on the result of the presence or absence of an error made by the error detection unit. .

According to a second aspect of the present invention for solving the problem of the conventional example, in the wireless data communication method, the transmitting side wirelessly transmits the data in a specific message length unit, and the receiving side transmits the data. When the error is received, error detection is performed, and if there is an error, the sender is notified of the error information, and when the sender receives the error information, the erroneous data is reduced to 1/2 the message length. It is characterized in that it is divided into two and continuously transmitted to the receiving side.

According to a third aspect of the present invention for solving the problems of the conventional example, in the wireless data communication method, the message length of transmission data is divided by the wireless data communication method according to the second aspect, and data transmission is performed. If there is no error in the received data due to the error detection of the data on the receiving side, the information indicating no error is notified to the transmitting side, and if the transmitting side receives the information without error. It is characterized in that the message length of the data to be transmitted next is doubled and transmitted to the receiving side.

According to a fourth aspect of the present invention for solving the problems of the conventional example, in the wireless data communication method according to the second aspect, if the transmitted data has an error, the erroneous data is reduced to 1/2. If it is divided into message lengths and there is an error, erroneous data will be divided into 1/4 message lengths, but if it does not reach the specific message length which is the unit of data transmission, the next data will be The feature is that the data is captured and transmitted.

[0017]

According to the invention described in claim 1, when the first processing unit in the data transmission control unit receives the error information notified from the error detection unit, the message length of the error data is set to 1 When the information without error is received, the transmission length of the data to be transmitted next is doubled within the range of the specific transmission length, and the wireless data communication device is transmitted from the transmission unit. When the line quality is poor, the message length can be shortened to reduce the error rate and data can be transmitted, and as the quality of the wireless line is restored, the message length can be lengthened and data can be transmitted. Therefore, it is possible to perform wireless communication with a message length suitable for the wireless line quality and improve the transmission efficiency.

According to the second aspect of the present invention, when the received data has an error, when the errored data is retransmitted, it is divided into 1/2 message lengths and continuously transmitted to the receiving side. Since the wireless data communication method is used, the error length can be reduced by shortening the message length when the quality of the wireless line is poor.

According to the third aspect of the present invention, if data is transmitted with the message length divided by the wireless data communication method according to the second aspect and there is no error in the received data, then Since the wireless data communication method in which the message length of the data to be transmitted is doubled and transmitted to the receiving side, the message length can be increased as the quality of the wireless line is restored, and the transmission efficiency can be improved.

According to the invention as set forth in claim 4, if the received data has an error, the message length of the retransmitted data is divided, but if it does not reach the specific message length which is a unit of data transmission, 2. The data transmission is performed by taking in the data of
Since the wireless data communication method described above is used, it is possible to collect data of message lengths that are finely divided and transmit the data with a specific message length, and to further improve the transmission efficiency.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. First, the configuration of a wireless data communication apparatus according to an embodiment of the present invention will be described with reference to FIG. The wireless data communication device of this embodiment is basically the same as the conventional device, and as shown in FIG. 1, the data transmission control unit 1 on the data transmission side and the data reception control unit on the data reception side. Further, the data reception control unit 2 is provided with an error detection unit 3 which performs an error check on the received data and transmits the result as a reception status to the data transmission control unit 1.

Next, each section of the wireless data communication apparatus of this embodiment will be described concretely. The data transmission control unit 1 includes a buffer 11 for temporarily storing data to be transmitted, a transmission unit 12 for transmitting data in a specific message length unit, for example, in units of 8 bytes, and 8 bytes from the buffer 11. When data is read out in units and sent to the transmission unit 12, the reception status from the error detection unit 3 is received, and it is determined that the reception status is a (data NG) signal indicating an abnormality, the data in error is re-determined. There is provided a processing unit 13 ′ that reads the data from the buffer 11, divides the data, and outputs the data to the transmission unit 12.

Further, to the data reception control unit 2, the reception unit 22 for receiving the data transmitted by radio and the data output from the reception unit 22 are transmitted to the error detection unit 3.
A processing unit 23 'that receives the result from the error detection unit 3 and sends normal data to the buffer 21 and a buffer 21 that temporarily stores the normal received data are provided.

The error detection unit 3 has the same structure as the conventional error detection unit, receives the received data from the processing unit 23 ', detects an error in the received data by a general error detection method, and detects the data. Processing unit 1 in transmission control unit 1
3'is notified by the reception status, and the state of the reception data is output to the processing unit 23 'of the data reception control unit 2. If the received data has an error, the reception status is added with information for identifying the incorrect data, as in the conventional case.

Further, the processing unit 1 which is a characteristic part of this embodiment
3'and the processing unit 23 'will be specifically described. Each time the processing unit 13 ′ of the data transmission control unit 1 receives a (data NG) signal and information indicating error data in the reception status from the error detection unit 3, it divides the message of erroneous data into two parts. Is transmitted to the transmission unit 12 after the status E is added to the message, and when the (data OK) signal is received from the error detection unit 3 in the reception status, the message length before division is calculated. Then, the next data is transmitted.

Then, the processing unit 13 'divides the message length of data of 8 bytes into 4 + 4 bytes (1/2) and further divides into 2 + 2 + 2 + 2 bytes (1/4) for each error occurrence. However, since the unit of the message length of the data transmitted from the transmission unit 12 is 8 bytes, when the result of the division is that the data of one unit has a message length of less than 8 bytes, The next data is similarly divided, and a part of the next data is added to the erroneous data and is sent to the transmitting unit 12.

Further, the processing unit 23 'of the data reception control unit 2
Operates so that the error detection unit 3 performs an error check to store the received data in the buffer 21 if the received data has no error, and does not store the received data in the buffer 21 if the received data has an error. It is a thing.
When an error occurs, the data transmission control unit 1 halves the message length of the data and transmits it. Therefore, it is necessary to associate the relationship between the retransmitted error-free data and the storage position in the buffer 21. .

That is, if the first data is transmitted and there is an error, the data is not stored in the buffer 21, and if there is no error in both of the retransmitted two-divided data, the position where the data is not stored in the buffer 21. However, if one of the two divided data has an error, only the correct data of the other is stored in the corresponding area of the buffer 21, and the erroneous data is stored again. The data is stored in the corresponding area of the buffer 21 when the error is eliminated in the data transmission. Thereby, the data order input to the data transmission control unit 1 and the data order output from the data reception control unit 2 can be associated with each other.

Next, the data communication method of this embodiment will be described with reference to FIGS. FIG. 2 is an explanatory diagram showing a communication example in the wireless data communication method according to the embodiment of the present invention. According to the wireless data communication method of the present embodiment, when no error has occurred, the data transmission control unit 1 adds a status to a certain message length (8 bytes in this embodiment), transmits the data, and receives the data. When the control unit 2 receives the data, the error detection unit 3 performs an error check on the received data, and the reception status of the result (data OK) is transmitted to the data transmission control unit 1.

When an error occurs in the data transmission, the error detector 3 sends (data NG) as a reception status, and the processor 13 'of the data transmission controller 1 is sent.
Then, the message to be retransmitted is divided into two and the length is half (4 bytes).
Then, the status E is added to each message and the two messages are retransmitted continuously.

Then, the data reception control unit 2 continuously receives data, and the error detection unit 3 performs an error check on each message, and when no error occurs in both messages (data OK). ) Reception status is transmitted to the data transmission control unit 1, and if an error occurs in any transmission, the reception status of (data NG) is transmitted to the data transmission control unit 1 for the message in which the error occurred. However, the message in which no error has occurred is stored in the buffer 21 as it is.

If the data transmission control unit 1 further receives the reception status of (data NG) for a part of the messages transmitted continuously, the processing unit 1 of the data transmission control unit 1
In 3 ', the message in which the error has occurred is further divided into two, and a message having a length (2 bytes) that is 1/4 of the original message is given a status E and retransmitted. If the total length of retransmitted messages is less than the original message length (8 bytes), create a message with the same message length (2 bytes) for the next new data and transmit it continuously. However, the total message length transmitted continuously should be 8 bytes.

Further, when the error is repeatedly generated, the message in which the error occurs is divided into two and retransmitted one after another, and the same message length as the retransmission is made until the total original message length (8 bytes) is reached. To replenish with new data. When the message is divided into two and the number of bytes of the data becomes odd, one dummy byte is formed by the dummy bit and added to the odd number of data, and then divided into two.

In the wireless data communication method of this embodiment, the data transmission control unit 1 divides the data according to the occurrence of an error and transmits the data. However, the error detection unit 3 of the data reception control unit 2 does.
Then, when the data of the initial transmission unit (8 bytes) is prepared, the error check of the received data is performed for each message, and 8
The transmission status (DATA OK) is transmitted only when no error has occurred in all the data of bytes, and when the error has occurred, the information indicating the data in which the error has occurred and the reception status (DATA NG) are transmitted. .

When the data transmission control unit 1 receives the (data OK) reception status from the error detection unit 3 while the data is being divided and transmitted, the message length is doubled. Each time the transmission is performed and the reception status of (data OK) is received from the error detection unit 3, the message length is doubled and gradually returned to the original message length (8 bytes).

Regarding the wireless data communication method of this embodiment,
This will be described more specifically with reference to the example of FIG. FIG. 2 shows data (1) (G1 to G8) and data (2) (A1 to A8) as data.
8), data (3) (Y1 to Y8), data (4) (Z1 to
Z8), data (5) (X1 to X8), ...

First, the data (1) (G1G2G
3G4G5G6G7G8E) is transmitted. Incidentally, “E” indicates the status, which is given for each transmission message unit. When the receiving side receives the data (G1G2G3G4G5G6G7G8), there is no error and the reception status (data O
K) is returned and the received data of data (1) is saved.

Next, the data (2) (A1A2A
3A4A5A6A7A8E) and the data received on the receiving side is data (A1A2A3BA5A6A7A8)
Since A4 is B, an error is detected and the reception status (data NG) is returned. Therefore, the received data of data (2) is not saved.

Therefore, when the transmitting side receives the reception status (data NG), it divides the erroneous data (2) into halves and divides the data (2-1) (A1A2A3A4E) and data (2-2) ( A5A6A7A8E) is created and continuously transmitted.

On the receiving side, when data (A1A2A3B) and data (A5A6A7A8) are received, an error check is performed on each received data, and A4 is B, so an error was found in data (2-1). , The data (2-2) is normal, so the reception status (data (2-1) NG) is returned and the error-free data (2
-Save the received data of 2).

The sender side receives the renewal reception status (data (2-
1) NG) is received, the data (2-1) is further divided into half, and the data (2-1-1) (A1A2E) and the data (2
-1-2) Create (A3A4E). Then, assuming that the initial message length (8 bytes) is not reached, the following data (3) to data (3-1-1) (Y1Y2E) and data (3-1-2) (Y
3Y4E) and send it continuously. The message length of transmission data is always 8 bytes. This allows
Transmission can be performed without waste, and transmission efficiency can be improved.

On the receiving side, data (A1A2), data (A3A4), data (Y1Y2) and data (Y3Y).
When 4) is received, an error check is performed on each received data, and since all the data were received normally, the reception status (data OK) is transmitted, and data (2-1-1), data (2- 1-2), data (3-1-1), data (3-1-
Save the received data of 2).

Next, the transmission side, which has received the reception status (data OK), returns the message length to 4 bytes, which is doubled, and the data (3-2) is continued from the continuation of the data (3) so that the total becomes 8 bytes. ) (Y5Y6Y7Y8E) and data (4-1) (Z1
Z2Z3Z4E) and continuously transmit.

On the receiving side, when the data (Y5Y6Y7Y8) and the data (Z1Z2Z3Z4) are received, an error check is performed on each received data, and since all the data have been normally received, the reception status (data OK) is transmitted, Save the data (3-2) and data (4-1).

Upon receiving the reception status (data OK), the transmission side further doubles the message length to 8 bytes, and combines the continuation of the data (4) and part of the data (5) into the data (4-
2,5-1) Create and send (Z5Z6Z7Z8X1X2X3X4E). In this way, wireless data communication is performed.

Next, the operation of the message length control in the processing unit 13 'of the data transmission control unit 1 in the wireless data communication apparatus of this embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the transmission side message length control of the present embodiment, and shows an example in which the normal message length (transmission standard) is 8 bytes.

First, set the message length to 8 bytes (10
0), create transmission data (101), and transmit the data (103). Next, the reception status is received (20
0), it is judged whether the reception status is (data OK) (201), and if it is (data OK), it is judged whether the current message length is 8 bytes (300), and the message length is If it is 8 bytes, the process returns to step 101. If the message length is not 8 bytes, double the message length (301) and process 101
Return to. If the reception status is not (data OK) in process 201, that is, if the reception status is (data NG), the message length is halved (40
0), the process 101 is returned to.

The data created in the process 101 is
A status E is added to the data according to the message length halved in the process 400, the message length doubled in the process 301, or the message length halved in the process 300 to obtain one message. It is created and made into a transmission standard of 8 bytes.

According to the wireless data communication apparatus and wireless data communication method of the present embodiment, the message length at the time of retransmission and transmission of new data is reduced to 1 / in the state where the transmission error occurs and the line quality is deteriorated. By setting it to 2, the error rate can be reduced, and as the line quality improves and transmission errors no longer occur, the message length is gradually returned to the original length. Since wireless communication can be performed with an adapted message length, there is an effect that transmission efficiency can be improved.

[0050]

According to the first aspect of the present invention, when the first processing unit in the data transmission control unit receives the error information notified from the error detection unit, the message length of the error data is transmitted. Is divided into ½, and when the information without error is received, the message length of the data to be transmitted next is doubled within the range of the specific message length unit, and the transmission unit transmits the wireless data communication device. If the quality of the wireless link is poor, the message length may be shortened to reduce the error rate and data may be transmitted, and as the wireless link quality is restored, the message length may be extended to transmit the data. Therefore, wireless communication can be performed with a message length suitable for the wireless line quality, and there is an effect that the transmission efficiency can be improved.

According to the second aspect of the present invention, when the received data has an error, when the errored data is retransmitted, it is divided into 1/2 message lengths and continuously transmitted to the receiving side. Since the wireless data communication method is used, there is an effect that the message length can be shortened and the error occurrence rate can be reduced when the quality of the wireless line is poor.

According to the third aspect of the present invention, if data is transmitted with the message length divided by the wireless data communication method according to the second aspect and there is no error in the received data, Since the wireless data communication method in which the message length of the data to be transmitted is doubled and the data is transmitted to the receiving side, the message length can be increased as the quality of the wireless line is restored, and the transmission efficiency can be improved. There is.

According to the fourth aspect of the invention, if the received data has an error, the message length of the retransmitted data is divided, but if the specified message length, which is the unit of data transmission, is not reached, 2. The data transmission is performed by taking in the data of
Since the wireless data communication method described above is used, it is possible to collect data of message lengths that are finely divided and transmit the data with a specific message length, which has the effect of further improving transmission efficiency.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a wireless data communication apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a communication example in a wireless data communication method according to an embodiment of the present invention.

FIG. 3 is a flow chart showing the operation of the message length control on the transmitting side of this embodiment.

FIG. 4 is a block diagram showing a configuration of a conventional wireless data communication device.

FIG. 5 is an explanatory diagram showing a communication example in a conventional wireless data communication method.

[Explanation of symbols]

1 ... Data transmission control unit, 2 ... Data reception control, 3 ...
Error detection unit, 11, 21 ... Buffer, 12 ... Transmission unit, 13, 13 ', 23, 23' ... Processing unit, 22 ... Reception unit

Claims (4)

[Claims] 1. A data transmission control unit that controls data transmission, a data reception control unit that controls data reception, and an error detection of data received by the data reception control unit to perform the data transmission control unit. In a wireless data communication device having an error detection unit for notifying to, a first storage unit for storing transmission data in the data transmission control unit,
When the transmission unit that transmits the data extracted from the first storage unit in units of a specific message length and the information with the error notified from the error detection unit are received, the message length of the data with the error is set to 1 When divided into / 2 and transmitted to the transmission unit, and when information without error is received, the transmission length of the data to be transmitted next is doubled within the range of the specific transmission length unit and transmitted to the transmission unit. A first processing unit is provided, a receiving unit that receives the transmitted data in the data reception control unit, a second storage unit that accumulates error-free data, and the received data for each message. The error-free data is sent to the error detection unit, and the error-free data is detected from the result of the error presence / absence performed by the error detection unit.
And a second processing unit for sending to the storage unit of the wireless data communication device. 2. The transmitting side wirelessly transmits data in a specific message length unit, the receiving side receives the data to detect an error, and if there is an error, informs the transmitting side of information indicating that the error exists. , When the sender receives the error information,
A wireless data communication method characterized in that erroneous data is divided into ½ message lengths and continuously transmitted to the receiving side. 3. In the wireless data communication method according to claim 2, when the message length of the transmission data is divided and the data is transmitted, the reception data is detected by the error detection of the data on the reception side. If there is no error, the sender is notified of the error-free information, and when the sender receives the error-free information, it doubles the message length of the data to be transmitted next and sends it to the receiver. A characteristic wireless data communication method. 4. When the transmitted data has an error, the erroneous data is divided into 1/2 message lengths, and when there is further error,
The erroneous data is divided into ¼ message lengths, but when the specific message length, which is a unit of data transmission, is not satisfied, the next data is fetched and data transmission is performed. 2. The wireless data communication method described in 2.