JPS63240144A - Information transmission system - Google Patents

Abstract

PURPOSE:To improve transmission efficiency by sending a data signal comprising a data block corresponding to a sending request block number in receiving a response signal without error from a receiver side so as to decrease the data length of the transmission/reception signal. CONSTITUTION:A data signal comprising prescribed number of data blocks constituted by adding a block number for each information blocked to a prescribed bit length is sent from a transmitter 10 to a receiver 20 and a response signal is returned from the receiver 20 to the transmitter 10. The transmitter 10 sends a data signal comprising data blocks in the order of block number at the start of information transmission and in not receiving the response signal from the receiver 20 without error, and sends the data signal comprising data blocks corresponding to the transmission request block number in receiving the response signal without error. The receiver 20 returns a response signal including the block number of prescribed number in the order of block number except the block number received without error. Thus, the data length of the transmission/reception signal is reduced to improve the transmission efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information transmission system in simplex communication used in mobile radio and the like.

(Prior art) As a conventional information transmission method of this type, Japanese Patent Application Laid-Open No. 59-1
There is one disclosed in Japanese Patent No. 22251. below,
The explanation will be based on this.

Figure 2 shows the transmission procedure in the conventional information transmission system. In the figure, A1 to AS are data signals sent from the sending side to the receiving side, and 81 to BB are responses sent back from the receiving side to the sending side. It's a signal.

Data signals A1 to A6 each have a fixed number of data blocks a, here four (however, only data signal A6 has two).
Each data block a has a block number field a1 containing its block number as shown in FIG.
It consists of an information field a2 containing block information obtained by dividing information to be transmitted into blocks of a certain bit length, and a parity field a3 containing parity pits for fields at and A2. In FIG. 2, the numbers (1), (2), . . . attached to each data block a of the data signal Al-A3 indicate block numbers.

In addition, the response signals 81 to B6 include a reception number field b1 containing the block number of each data block in the received data signal as shown in FIG. It consists of a response field b2 containing response information indicating whether the received response was received successfully or not without error (negative response), and a parity field b3 containing parity pits for fields b1 and b2. In addition, in FIG. 2, each response signal Bl
-Numbers (1), (2), etc. written in the BB
... indicates the block number in the reception number field bl, and the numbers (1), (2), ...
. . The characters ACK shown below indicate the information on the positive response, and the characters NAK indicate the information on the negative response.

Next, conventional information transmission will be explained with reference to FIG.

First, the transmitting side transmits a data signal Al composed of four data blocks with block numbers (1) to (4) to the receiving side. During the transmission of the data signal AI, the block number (2
), the receiving side uses the well-known parity check to check the block number (1).
, (3), and (4) were received without error, and it was determined that there was one data block that could not be received without error, and the data block that could not be received was determined to be the block number (2). It is estimated that there is a block number (1).

A response signal B1 including (2), (3), and (4) and corresponding response information ACX, NAK, ACX, and ACK is returned to the transmitting side.

An error occurred during the transmission of the response signal B1, and the response signal B1 could not be received without error on the transmitting side (strictly speaking, the response signal B1 was not received within a predetermined time after the data signal A1 was transmitted.
cannot be received without error), the transmitting side transmits a data signal A2 composed of the same data block as the previously transmitted data signal AI to the receiving side.

The data signal A2 is received by the receiving side without any errors, and the block number (1) is given by the receiving side.

When the response signal B2 containing (2), (3), (4) and the corresponding response information ACK, ACK, ACK, ACK is returned to the transmitting side, the transmitting side returns the next block number (5). A data signal A3 made up of data blocks of (8) is transmitted to the receiving side.

During the transmission of the data signal A3, block number (6),
An error occurred in the data block (8), and the receiving side sent that block number (5), (6), (7).
, (8) and response information A corresponding to each of these.
CK, NAK.

When the response signal B3 including ACK and NAK is returned to the sending side, the sending side sends data blocks with block numbers (11), ( 12), block numbers (6), (8), (9),
Data signal A4 consisting of data blocks of (10)
is sent to the receiving side.

Thereafter, the transmitting side transmits the data signal and sends the response signal as described above until it receives an acknowledgment (ACK) from the receiving side for all data blocks up to the last block number, here data block (15). Repeat reception.

As mentioned above, an information transmission method in which a response signal is returned from the receiving side and data transmission is repeated until all data signals are transmitted without error is called an auto-repeat request (A).
This is called the auto Repeat Request) method.

(Problems to be Solved by the Invention) However, in the conventional method, when a response signal including a negative response corresponding to a data block of - is received, an acknowledgment or a negative response corresponding to the data block of - is received. Even if a response signal containing one of the responses cannot be received without error, the transmitting side transmits a data signal containing the above-mentioned - data block. There is a high possibility that the data will be transmitted repeatedly, resulting in low transmission efficiency.

In addition, if the receiving side determines that there is a data block that could not be received without error, the block number in the block number field of that data block cannot be adopted as the correct block number, so there is no error before or after it. It is necessary to estimate the block number of the data block that could not be received without error from the block number of the data block that could be received, but this estimation requires a dedicated circuit or program, and the hardware on the receiving side is required. There was a problem in that the scale of the software and software became larger and the cost increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information transmission method that eliminates the above-mentioned problems, has high transmission efficiency, and allows the hardware and software on the receiving side to be made smaller.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention blocks the information to be transmitted into blocks of a certain bit length, adds a block number to each block of information, and then transmits the data by adding a block number to each block of information. In an information transmission method in which a data signal consisting of a certain number of data blocks is transmitted from the transmitting side to the receiving side, and a response signal is returned from the receiving side to the transmitting side, the transmitting side When the response signal from the receiving side cannot be received without error, a data signal consisting of data blocks in the order of block numbers is transmitted, and when the response signal from the receiving side is received without error, the data signal is transmitted from the data block corresponding to the transmission request block number. The receiving side sends back to the sending side a response signal containing a fixed number of block numbers in the order of block numbers excluding the block number of the data block received without error in the data signal as the transmission request block number. That's how I did it.

(Function) According to the present invention, if there is a data block that could not be received without error on the receiving side in the data signal transmitted from the transmitting side, block numbers of other data blocks that could be received without error are excluded. A response signal containing a certain number of block numbers in the order of block numbers as transmission request block numbers is sent back from the reception side to the transmission side, and if the response signal is received without error on the transmission side, it corresponds to the transmission request block number. A data signal consisting of data blocks is transmitted, and if the response signal cannot be received without error, a data signal consisting of data blocks in the order of block numbers is transmitted.

(Embodiment) FIG. 1 shows the configuration of a data transmission device that implements the information transmission system of the present invention. In the figure, 11 is a communication control section, 12 is a transmitting section, 13 is a receiving section, 14 is an antenna switch, and 15 is an antenna, which are connected to the transmitting device 10.
Also, 21 is a communication control section, 22 is a transmission section, 2
3 is a receiving section, 24 is an antenna switch, and 25 is an antenna, which constitute the receiving device 20.

Note that actual mobile radio main stations and mobile stations are often equipped with data transmission equipment that has the functions of both the transmitting side and the receiving side, but here, for the sake of simplicity, we will use one as the transmitting side. and the other only on the receiving side.

The communication control section 11 of the transmitting device 10 creates a data signal to be transmitted according to the flowchart shown in FIG.
2, the antenna switch 14 is switched to the transmitting side, and transmitted to the receiving device 20 via the antenna 15. Also, the antenna switching device 14 is switched to the receiving side, and the response signal sent from the receiving device 20 is sent to the antenna 15. ．． The signal is received via the antenna switch 14 and the receiving section 13, and control corresponding to the content is executed.

The communication control unit 21 of the receiving device 20 normally controls switching of the antenna switch 24 to the receiving side, receives the data signal sent from the transmitting device 10 via the antenna 25° antenna switch 24 and the receiving unit 23, A response signal is created according to the flowchart shown in FIG. 6 and a table described later, and sent to the transmitter 22. The signal is returned to the receiving device 20 side via the antenna switch 24 and antenna 25 which have been switched to the transmitting side.

FIG. 7 shows the transmission procedure in the method of the present invention. In the figure, AOI to AO5 are data signals transmitted from the transmitting device 10 to the receiving device 20, and 01 to C4 are data signals sent back from the receiving device 20 to the transmitting device 10. A response signal D is sent from the receiving device 20 to the transmitting device 1 when the reception of all data signals is completed.
This is the termination (NRQ) signal sent back to 0.

The data signals AOI-AO5 are basically the same as conventional data signals, each having a fixed number of numbers, here four (however,
Only the data signal AO5 consists of data blocks a (3). In addition, as shown in FIG. 8, the response signals C1 to C4 are transmission request numbers that include a certain number (four in this case) of transmission request block numbers requesting the transmitting side to send a data block of the corresponding block number. field c1,
and a parity field c2 containing a parity bit for the field cl. In addition, in FIG. 7, the numbers (
1), (2), . . . indicate block numbers in the transmission request number field cl. The contents of the NRQ signal are arbitrarily determined by agreement between the transmitting device 10 and the receiving device 20.

FIG. 9 shows a table 30 for determining the transmission request block number in the receiving device 20, from block number (1) to block number (n) (where n is the number that is sent from the transmitting device 10 to the receiving device 20. A 1-bit information recording area is provided corresponding to each of the maximum number of data blocks to be transmitted. Initially, all bits "0" are written in the information recording area, and when a - data block is received without error, a bit "1" is written in the information recording area of the corresponding block number. ing. Note that the table 30 is provided in a random access memory (RAM) of the communication control unit 21, and its reading and writing are controlled by a microprocessor (CPU).

1.0 (a) to (e) show changes in the contents of the table 30 corresponding to the transmission procedure of FIG. 7. below,
The state of data transmission according to the present invention will be explained.

First, in the transmitter 10, the communication controller 1 transmits the data signal AOI, which is composed of four data blocks with block numbers (1) to (4), to the transmission buffer in the transmitter 12.
(not shown), applies predetermined modulation, and transmits to the receiving device 20 via the antenna switch 14 and antenna 15.

The modulated data signal A is transmitted to the antenna 25 of the receiving device 20. The signal is received and demodulated via the antenna switch 24 and the receiving section 23, and further sent to the communication control section 21 where a well-known parity check is performed. At this time, if an error occurs only in the data block of block number (2) during transmission, the communication control unit 21 will check that the data blocks of block numbers (1), (3), and (4) are correct. Recognizing that it has been received, the block number (1
), (3).

Set bit "1" in the information recording area corresponding to (4).

Next, the communication control unit 21 selects from the table 30 four block numbers in which the bit rOJ is written in the information recording area from the beginning, that is, from the one with the smallest number. In this case, the selected block numbers are (2), (5),
(6) and (7), which become the transmission request block number. The communication control unit 21 receives transmission request block numbers (2), (5), and (6) as shown in FIG.

A response signal C1 with (7) set in the transmission request number field is created, sent to the transmitter 22, subjected to predetermined modulation, and sent back to the transmitter 10 via the antenna switch 24 and antenna 25.

The modulated response signal C1 is transmitted to the antenna 15 . The signal is received and demodulated via the antenna switch 14 and the receiving section 13, and further sent to the communication control section 11 where a well-known parity check is performed. At this time, an error occurred during transmission, and the response signal C\1 could not be received without error (strictly speaking, the response signal C1 could not be received without error within a predetermined time after transmitting the data signal AOI). If so, the communication control device 11 selects the next block number (5
), (8), (7), and (8), the data signal AO2 is transmitted to the receiving device 20.

When the data signal AO2 is received by the receiving device 20 without any errors, the block numbers (5), (5) in the table 30, as shown in FIG.
8) Set bit "1" in the information recording area corresponding to (7) and (8). Also, in the receiving device 20, as described above, four block numbers in which bit "0" is written in the information recording area from the table 30, that is, (2
), (9), (10), and (11), and sends a response signal C2 using these as transmission request block numbers to the transmitting device 10.
send it back to

When the response signal C2 is received by the transmitting device 10 without any errors, the block numbers (2), (9), (10), (11) corresponding to the transmission request block number are
A data signal AO3 composed of data blocks is transmitted to the receiving device 20.

Also, in the data signal AO3, block number (9),
An error occurs in the data block corresponding to (11),
When the data blocks corresponding to block numbers (2) and (10) are received by the receiving device 20 without error, as described above,
As shown in FIG. 10(C), bit "1" is set in the information recording area corresponding to the block numbers (2) and (10) in the table 30, and the next transmission request block number is set in the table 30. Block number (9) from 30
, (11), (12), and (13), and sends back a response signal C3 including these to the transmitting device 10.

When the response signal C3 is received by the transmitting device 10 without any errors, it is composed of data blocks with block numbers (9), (11), (12), and (13) corresponding to the transmission request block number. Receive data signal AO4 fif
Send to 20.

Also, in the data signal A-04, block number (13
), and the data blocks corresponding to block numbers (9), (11), and (12) are received by the receiving device 20 without error. ) as shown in Table 30
The block numbers (9), (11), (
Set bit "1" in the information recording area corresponding to 12), and then set block numbers (13), (14), and (14) from table 30 as the next transmission request block number.
(15).

(16) and sends a response signal C4 containing them.

It is sent back to the device 10.

When the response signal C4 is received by the transmitting device 10 without any errors, it transmits a data signal consisting of a data block with a block number corresponding to the transmission request block number, but in this case, the data block is the block number (15). Since the data block is the last data block (final block), block numbers (13), (14), (15)
) is transmitted to the receiving device 20.

When the data signal AO5 is received by the receiving device 20 without any errors, the block number (13) in the table 30, as shown in FIG.
(14) Set bit "1" in the information recording area corresponding to (15).

Further, when the communication control unit 21 of the receiving device 20 determines that the data block with block number (15) is the final block, in the table 30, block number (15) is determined to be the last block.
Whether bit "1" is set in all information recording areas up to 5), that is, whether all data blocks up to block number (15) could not be received without error, that is, whether there is an unreceived data block. At this time, if there is no unreceived data block, an NRQ signal is sent to the transmitter 10 as a response signal, and the communication is terminated.

Furthermore, if there is an unreceived data block, a response signal including the block number is sent back to the transmitting device 10, as described above.

In addition, only when the transmitting device 10 fails to receive the response signal twice in a row without error, and only when the NRQ signal cannot be received without error, the transmitting device 10 transmits the same data as the previously transmitted data signal. Send the signal again.

(Effects of the Invention) As explained above, according to the present invention, even if the sending side cannot receive a response signal from the receiving side without error, it can send the next data signal without sending the same data signal again. Therefore, there is almost no possibility that a data block that was actually received without error will be transmitted twice or more on the receiving side, and there is no need for conventional response information in the response signal. , it is possible to shorten the data length of the response signal, thus increasing transmission efficiency, and there is no need for the receiving side to estimate the block number of the data block that could not be received without error. This has the advantage that the scale of hardware and software can be reduced, and a cheaper device can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a data transmission device implementing the information transmission method of the present invention, FIG. 2 is a diagram showing the transmission procedure in the conventional information transmission method, and FIG. 3 is the configuration of data blocks in a data signal. FIG. 4 is a diagram showing the configuration of a conventional response signal, FIG. 5 is a flowchart of processing in the communication control section of the transmitting device, FIG. 6 is a flowchart of processing in the communication control section of the receiving device, and FIG. 8 is a diagram showing the structure of a response signal of the invention, FIG. 9 is a diagram showing a table for determining a transmission request block signal, and FIG. Figures (a) to (e) are diagrams showing changes in the contents of the table corresponding to the transmission procedure of Figure 7. 10... Transmitting device, 20... Receiving device, 11°21
... Communication control section, 12.22 ... Transmission section, 13.2
3... Receiving section, 14.24... Antenna switching device, 1
5.25...Antenna, 3o...Table.

Claims (1)

[Claims] Information to be transmitted is divided into blocks of a certain bit length, a block number is added to each block of information to form a data block, and a data signal consisting of a certain number of data blocks is generated. In an information transmission method in which the sending side sends a message to the receiving side, and the receiving side returns a response signal to the sending side, the sending side sends a block number at the beginning of information transmission and when it cannot receive the response signal from the receiving side without error. A data signal consisting of sequential data blocks is transmitted, and when a response signal is received without error from the receiving side, a data signal consisting of a data block corresponding to the transmission request block number is transmitted, and the receiving side uses the transmission request block number as An information transmission system characterized in that a response signal including a fixed number of block numbers in the order of block numbers excluding the block number of a data block received without error in the data signal is returned to a transmitting side.