JPH0671249B2 - Information transmission method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an information transmission system in simplex communication used for mobile radio and the like.

(Prior Art) As a conventional information transmission system of this type, Japanese Patent Laid-Open No. Sho-112222
Some are disclosed in Japanese Patent No. 51. Hereinafter, description will be given along this line.

FIG. 2 shows a transmission procedure in the conventional information transmission method. In the figure, A1 to A6 are data signals transmitted from the transmission side to the reception side, and B1 to B6 are responses returned from the reception side to the transmission side. It is a signal.

Each of the data signals A1 to A6 consists of a fixed number, here four (but only two data signals A6) data blocks a, and each data block a includes a block number including its block number as shown in FIG. A field a1, an information field a2 containing block information obtained by blocking information to be transmitted into a certain bit length, and fields a1 and a2
And a parity field a3 containing a parity bit for In FIG. 2, the number (1) assigned to each data block a of the data signals A1 to A6,
(2), ... Indicates the block number.

The response signals B1 to B6 are, as shown in FIG. 4, a reception number field b1 containing the block number of each data block in the received data signal and the received data block could be received without error (acknowledgement). It is composed of a response field b2 containing response information indicating whether or not it could not be received without error (negative response), and a parity field b3 containing parity bits for the fields b1 and b2.
In FIG. 2, the numbers (1), (2), ... Described in the response signals B1 to B6 are the received number fields.
The block number in b1 is shown, and the block number (1),
(2), ... Characters ACK attached below indicate information on the affirmative response, and characters NAK indicate information on the negative response.

Next, a conventional information transmission method will be described with reference to FIG.

First, the transmitting side transmits a data signal A1 composed of four data blocks having block numbers (1) to (4) to the receiving side. If an error occurs only in the data block of block number (2) during the transmission of the data signal A1, the receiving side performs block number (1),
The data blocks of (3) and (4) are received without error,
Further, it is determined that there is one data block that could not be received without error, and it is estimated that the data block that could not be received is block number (2), and block numbers (1), (2), (3 ), (4) and response signal B1 including response information ACK, NAK, ACK, and ACK corresponding to these, respectively.
To the sender.

An error occurs during the transmission of the response signal B1, and the response signal
If b1 cannot be received without error at the transmitting side (strictly speaking, response signal B1 cannot be received within a predetermined time after transmitting data signal A1 without error), the transmitting side is the same as the previously transmitted data signal A1. The data signal A2 composed of the data block is transmitted to the receiving side.

The data signal A2 is received on the receiving side without any error,
From the receiving side, the block numbers (1), (2), (3),
(4) and response information ACK and AC corresponding to these
When the response signal B2 including K, ACK and ACK is returned to the transmitting side,
The transmitting side transmits the data signal A3 composed of the data blocks of the following block numbers (5) to (8) to the receiving side.

During transmission of the data signal A3, the block number (6),
An error occurs in the data block of (8), and the block numbers (5), (6), (7) and (8) of the receiving side and the response information ACK, NAK, ACK and NAK corresponding to these respectively.
When the response signal B3 including the is sent back to the transmitting side, the transmitting side selects one of the block numbers (11) and (12) among the data blocks of the block numbers (9) to (12) that were to be transmitted next. Stop sending data block, block number (6),
The data signal A4 composed of the data blocks (8), (9) and (10) is transmitted to the receiving side.

Hereinafter, the transmitting side transmits the data signal and the response signal as described above until the receiving side obtains an acknowledgment (ACK) for all the data blocks up to the last block number, here the data block of (15). The reception of is repeated.

As mentioned above, the information transmission method that returns a response signal from the receiving side and repeats data transmission until all data signals are transmitted without error is called an auto repeat request (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 one data block is received, an acknowledgment or a negative response corresponding to the one data block is received. Even if the response signal including one of the responses cannot be received without error, the transmitting side transmits the data signal including the one data block, so that the data block transmitted without error is transmitted to the receiving side twice or There is a high possibility that the data will be transmitted repeatedly, and the transmission effect was low. Also, 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. The block number of the data block that could not be received without error must be estimated from the block number of the data block that could be received, but this estimation requires a dedicated circuit or program. There was a problem that the scale of the ware and software increased, and the cost increased.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned problems and to provide an information transmission system having high transmission efficiency and capable of reducing the size of hardware and software on the receiving side.

(Means for Solving Problems) In order to solve the above problems, in the present invention, information to be transmitted is divided into blocks of a certain bit length, and a block number is added to each of the blocked information to add data. In the information transmission method in which a block is composed, a data signal consisting of a fixed number of data blocks is transmitted from the transmission side to the reception side, and a response signal is returned from the reception side to the transmission side. When the response signal from the side cannot be received without error, a data signal composed of untransmitted data blocks in block number order is transmitted, and when the response signal from the receiving side is received without error, it is included in the response signal,
The data signal consisting of the data block corresponding to the transmission request block number is transmitted, and the receiving side removes the block number of the data block received without error in the data signal,
A response signal including a fixed number of block numbers in the order of block numbers as a transmission request block number is sent back to the transmission side.

(Operation) According to the present invention, when there is a data block which cannot be received without error at the receiving side in the data signal transmitted from the transmitting side, the block number of the data block which can be received without any other error is excluded. If a response signal containing a fixed number of block numbers in the order of block numbers as a transmission request block number is returned from the receiving side to the transmitting side and the response signal can be received without error at the transmitting side, it corresponds to the transmission request block number. A data signal composed of data blocks corresponding to the block numbers is transmitted, and when the response signal cannot be received without error, data signals composed of data blocks in the order of block numbers are transmitted.

(Embodiment) FIG. 1 shows the configuration of a data transmission apparatus for implementing the information transmission system of the present invention. In the figure, 11 is a communication controller, 12 is a transmitter, 13 is a receiver, 14 is an antenna switch,
15 is an antenna, these constitute the communication device 10, 21 is a communication control unit, 22 is a transmitting unit, 23 is a receiving unit, 24 is an antenna switch, 25 is an antenna, these are receiving devices.
Make up 20.

In many cases, the actual mobile radio main station or mobile station is equipped with a data transmission device having both functions of a transmission side and a reception side. And only the receiving side.

The communication controller 11 of the transmitter 10 creates a data signal for communication according to the flowchart shown in FIG. 5, sends it to the transmitter 12, switches the antenna selector 14 to the transmitter, and receives the signal via the antenna 15. 20 and the antenna switching device 14 is switched to the receiving side, the response signal sent from the receiving device 20 is received via the antenna 15, the antenna switching device 14 and the receiving unit 13, and the control corresponding to the content is received. To execute.

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

FIG. 7 shows a transmission procedure in the method of the present invention. In the figure, A01 to A05 are data signals transmitted from the transmitter 10 to the receiver 20, and C1 to C4 are returned from the receiver 20 to the transmitter 10. Is a response signal, D is returned from the receiving device 20 to the transmitting device 10 when reception of all data signals is completed (NR
Q) It is a signal.

The data signals A01 to A05 are basically the same as the conventional data signals, and each of them is composed of a fixed number, here, four (in this case, only three data signals A05) data blocks a. Further, the response signals C1 to C4 are transmission request numbers including a certain number (here, four) of transmission request block numbers for requesting the transmission side to transmit the data block of the corresponding block number, as shown in FIG. Field c1 and the field
Parity field c2 containing the parity bit for c1
It consists of and. In FIG. 7, the numbers (1), (2), ... Described in the response signals C1 to C4 indicate the block numbers in the transmission request number field c1. The content of the NRQ signal D is arbitrarily determined by the 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. Block number (1) to block number (n) (where n is from the transmitting device 10 to the receiving device 20). A 1-bit information recording area is provided for each of the maximum number of data blocks to be transmitted. Initially, all bits "0" are written in the information recording area, and when one data block is received without error, bit "1" is written in the information recording area of the corresponding block number. ing. The table 30 is provided in the random access memory (RAM) of the communication control unit 21, and its reading and writing are controlled by the microprocessor (CPU).

FIGS. 10A to 10E show changes in the contents of the table 30 corresponding to the transmission procedure of FIG. The data transmission according to the present invention will be described below.

First, in the transmitter 10, the communication controller 11 sets a data signal A01 composed of four data blocks of block numbers (1) to (4) in a transmission buffer (not shown) in the transmitter 12, Antenna changer 14
And to the receiving device 20 via the antenna 15.

The modulated data signal A01 is received and demodulated via the antenna 25, the antenna switching unit 24 and the receiving unit 23 of the receiving device 20, and further sent to the communication control unit 21 to perform the well-known parity check. At this time, if an error occurs only in the data block of block number (2) during the transmission, the communication control unit 21 determines that the data blocks of block numbers (1), (3), and (4) have no error. Recognizing that it has been received, as shown in FIG. 10 (a), the block numbers (1), (3),
Bit "1" is set 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 "0" is written in the information recording area at the head, that is, from the smallest block number. in this case,
The selected block numbers are (2), (5), (6),
(7), which is the transmission request block number. As shown in FIG. 7, the communication control unit 21 creates a response signal C1 in which the transmission request block numbers (2), (5), (6), and (7) are set in the transmission request number field, and this is generated by the transmission unit. twenty two
To the transmitting device 10 via the antenna switching unit 24 and the antenna 25.

The modulated response signal C1 is the antenna 1 of the transmitter 10.
5, received via the antenna switching unit 14 and the receiving unit 13, demodulated, and further sent to the communication control unit 11 to perform the well-known parity check. At this time, an error occurred during transmission, and the response signal C1 could not be received without error (strictly speaking, after the transmission of the data signal A01, the response signal C1 was received within a predetermined time.
Is not received without error), the communication control device 11 determines the next block number (5), (6), (7),
The data signal A02 including the data block of (8) is transmitted to the receiving device 20.

When all of the data signal A02 is received by the receiving device 20 without error, the block numbers (5), (6), and (6) of the table 30 as shown in FIG.
Bit "1" is set in the information recording area corresponding to (7) and (8). 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) are selected, and the response signal C2 having these as transmission request block numbers is returned to the transmitter 10.

When the response signal C2 is received by the transmitter 10 without any error, it is composed of data blocks of block numbers (2), (9), (10) and (11) corresponding to the transmission request block number. The data signal A03 is transmitted to the receiving device 20.

In the data signal A03, block numbers (9), (1
When an error occurs in the data block corresponding to 1) and the data block corresponding to the block numbers (2) and (10) is received by the receiving device 20 without error, as shown above, as shown in FIG. 10 (c). As described above, bit "1" is set in the information recording area corresponding to the block number (2), (10) in the table 30, and then the block number (9), (11),
(12) and (13) are selected, and the response signal C3 including them is returned to the transmitter 10.

When the response signal C3 is received by the transmitter 10 without any error, it is composed of data blocks of block numbers (9), (11), (12) and (13) corresponding to the transmission request block number. The data signal A04 is transmitted to the receiving device 20.

Further, in the data signal A04, an error occurs in the data block corresponding to the block number (13), and the data blocks corresponding to the block numbers (9), (11) and (12) are received by the receiving device 20 without error. Then, similarly to the above, as shown in FIG. 10 (d), a bit "1" is set in the information recording area corresponding to the block numbers (9), (11) and (12) in the table 30. , As the next transmission request block number, the block numbers (13), (1
4), (15), (16) are selected and the response signal C including them is selected.
4 is returned to the transmitter 10.

When the transmission device 10 receives all the response signals C4 without error, it transmits a data signal including a data block having a block number corresponding to the transmission request block number. In this case, the block number (15) Since the data block of is the last data block (final block), the data signal A05 including the data blocks of block numbers (13), (14), and (15) is transmitted to the receiving device 20.

When all the data signals A05 are received by the receiving device 20 without any error, the block numbers (13), (14), (15) of the table 30 as shown in FIG.
Bit "1" is set in the information recording area corresponding to.

Further, when the communication control unit 21 of the receiving device 20 determines that the data block of the block number (15) is the final block, the bits are written in all the information recording areas up to the block number (15) in the table 30. It is determined whether "1" is set, that is, all the data blocks up to the block number (15) could not be received without error, that is, whether there is an unreceived data block. At this time, the unreceived data block If there is no block, NRQ signal D as a response signal
To the transmitter 10 to terminate the communication. Also, if there is an unreceived data block, a response signal including the block number is returned to the communication device 10 as described above.

Further, the same data as the data signal transmitted in the previous round is transmitted only when the transmitter 10 cannot receive the response signal twice without error and the NRQ signal D cannot be received without error. Retransmit the signal.

(Effects of the Invention) As described above, according to the present invention, even when the transmitting side cannot receive the response signal from the receiving side without error, the next data signal is transmitted without transmitting the same data signal again. Therefore, there is almost no possibility that the data block actually received by the receiving side without error will be transmitted twice or more, and the conventional response information is not required in the response signal. The data length of the response signal can be further shortened, so that the transmission efficiency can be improved, and the receiving side does not need to estimate the block number of the data block that could not be received without error. Therefore, there are advantages that the scale of hardware and software can be reduced, and a cheaper device can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a data transmission device for implementing the information transmission system of the present invention, FIG. 2 is a diagram showing a transmission procedure in the conventional information transmission system, and FIG. 3 is a configuration of a data block in a data signal. FIG. 4 is a diagram showing the structure of a conventional response signal, FIG. 5 is a flow chart of processing in the communication control unit of the transmitting device, FIG. 6 is a flow chart of processing in the communication control unit of the receiving device, and FIG. FIG. 8 is a diagram showing a transmission procedure in the information transmission system of the present invention, FIG. 8 is a diagram showing a structure of a response signal of the present invention, FIG. 9 is a diagram showing a table for determining a transmission request block signal, and FIG. (A)-(e) is a figure which shows the change of the content of the table corresponding to the transmission procedure of FIG. 10 …… Transmission device, 20 …… Reception device, 11,21 …… Communication control unit, 12,22 …… Transmission unit, 13,23 …… Reception unit, 14,24 …… Antenna switch, 15,25… ... antenna, 30 ... table.

Claims (1)

[Claims] 1. A data block is constructed by dividing information to be transmitted into blocks of a certain bit length, adding a block number to each of the blocked information, and generating a data signal composed of a certain number of the data blocks. In an information transmission method of transmitting from a transmitting side to a receiving side and returning a response signal from the receiving side to the transmitting side, the transmitting side cannot receive a response signal from the receiving side at the start of information transmission without error. When the response signal from the receiving side is received without error, the data corresponding to the transmission request block number included in the response signal is transmitted when the response signal from the receiving side is received without error. Transmitting the data signal composed of blocks, the receiving side is the block number of the data block received without error in the data signal The minus, the information transmission method characterized by returning the response signal including a certain number of books number of order of the block number as said transmission request block number to the transmitting side.