JPH0621923A - Radio communication method - Google Patents

Abstract

PURPOSE:To provide a communication system which can perform the communication of data with high efficiency for the communication of data carried out between the information processors. CONSTITUTION:The information processors 3a and 4a are communicatably connected to the radio equipments 1a and 2a which contain the transmitting data buffers 7c and 7d and the receiving data buffers 8c and 8d respectively. The communication of data is carried out between both processors 3a and 4a by radio through the buffers 7c, 7d, 8c, 8d. That is, the transmission data are previously divided into the blocks of each prescribed size and transmitted. When the divided data are received by the equipment 2a of the receiver side, the information is transmitted to decide for each block whether the received data include an error or not. Thus the equipment 1a of the transmitter side receives the information and transmits only the relevant block 3/N that has a reception error.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method capable of efficiently performing data communication between information processing devices by wireless communication.

In wireless communication, it is not necessary to specify a communication place, and communication can be performed from anywhere in a service area. Therefore, it is extremely excellent as a contact means when the communication partner needs to move. Further, even if the communication partner does not move, there is no need to connect directly with a communication cable or the like, which has an advantage that installation work is easy.

By the way, as a method of transmitting necessary information, the method of carrying out by conversation, that is, voice communication is the easiest, but in order to transmit a lot of information accurately and quickly, data communication using an information processing apparatus, that is, a computer. Is excellent.

Therefore, a host computer is connected to a fixed station or command station radio, while a mobile station radio is connected to a data terminal or DTE (Data Terminal Equipment).
A system that is configured to connect t) and to perform data communication by wireless communication is widely used.

On the other hand, a data buffer for transmission and reception is provided in the wireless device to provide independence in communication and control of communication in a wireless communication section between the wireless device on the data transmitting side and the wireless device on the data receiving side. A communication method has been proposed (Japanese Patent Application No. 3-274214, Japanese Patent Application No. 3-279292) in which data communication between a computer and a DTE is not directly affected by communication quality in a wireless communication section.

It is shown that both the improvement of data transmission efficiency and the improvement of the operating rate of the host computer can be achieved at the same time, and the state of the communication partner station can be known, and their high effectiveness is demonstrated. Has been proven.

On the other hand, since the communication quality of the wireless communication section is influenced by the communication space, a reception error may sometimes occur in the received data. This is especially noticeable when one wireless station is moving. Therefore, in such a case, communication control is performed so that the data is retransmitted and correct data is received.

However, there is a problem that extra time is required for data retransmission and the data transmission efficiency is reduced. Therefore, there is a demand for a wireless communication method that efficiently retransmits data.

[0009]

2. Description of the Related Art (1) Configuration of a communication system in which a radio has a data buffer FIG. 6 is a diagram for explaining a wireless communication system having a data buffer, and (a) is a diagram for explaining the configuration of the communication system,
(b) is a figure explaining the format of communication data.

That is, the data communication between the host computer 3 of the fixed station 5 and the DTE 4 of the mobile station 6 is performed via the radio 1 and the radio 2. And
Transmission data buffers 7a and 7b are provided for each radio 1 and 2, respectively.
And reception data buffers 8a and 8b, and communication control units 10a and 10b for controlling data transmission.

Incidentally, in the conventional example shown in FIG. 6, the data buffers 7a, 8a (7b, 8b) and the communication control section 10a (10b).
DCU _-1 9
a and _{DCU -2 9b (DCU: Data Comunication} Un
It) is built into the radios 1 and 2. still,
If these are configured by a microcomputer system, they can be easily configured.

Of course, the communication control units 10a and 10b are the wireless devices 1,
It also links with the control unit of 2 and executes transmission / reception control of the wireless devices 1 and 2 in accordance with transmission / reception of data.

On the other hand, the structure of communication data is 251 bytes in total length, 2 bytes in the command part b ₁ as a header, and the car number part.
₃ bytes are provided in b ₂ , 4 bytes are provided in the sequence number part b ₃ , and then 242 bytes are provided in the data part b ₄ .

The command part b ₁ represents the type of communication, that is, the type of individual communication or broadcast communication. Further, the vehicle number part b ₂ represents the vehicle management number of the communication destination, and the sequence number part b ₃ represents the data management number of the data part b ₄ .

(2) Data Flow It will be explained in advance through which route data communication between the host computer 3 and the DTE 4 is performed.

That is, the transmission data TX _DATA-1 from the application program APL _-1 operating on the host computer 3 is a wired communication procedure (for example, BS
C procedures and FTS procedure, DCU _-1 9a in TTY procedure etc.)
In the transmission buffer 7a of the
From the wireless device 2 to the data transmission destination.

Then, the radio device 2 which has received the data D
The reception data is stored in the reception data buffer 8b of the CU- ₂ 9b and is output to the DTE 4 as reception data RX _{DATA-1 by} a wired communication procedure.

The application program APL _-2 running on the DTE 4 processes the received data,
Display etc.

Conversely, from DTE 4 to the host computer
3 to transmit data, the same procedure is used to reverse
Data flows. That is, the transmission data TX_DATA-2Is D
CU _-2 9b transmission data buffer 7b → radio 2
→ Radio 1 → DCU_-19a receive data buffer
8a is transmitted in order, and finally received data RX_DATA-2age
To the host computer 3.

(3) Communication Procedure FIG. 7 is a diagram for explaining the communication procedure. In the figure, the communication work is indicated by an arrow, and its time series progresses downward in the figure.

Here, the communication procedure will be described by taking as an example the case where data managed by the host computer 3 is transmitted to the DTE 4.

[0022] 1) the host computer → DCU _-1 (fixed station radio transceiver) First, the host computer 3 inquires whether the data can be transmitted in ENQ (Inquiry character) to DCU _-1 9a. Then, ACK indicating that data transmission is possible
When (Acknowledge character) is sent back from the DCU _-1 9, and transmits the data to the DCU _-1 9a.

[0023] DCU _-1 9a receives complete the transmission data and returns the meanings receiving all of their data EOT (End-Of-Transmission character ).

[0024] Therefore, if the data to be transmitted is present more in the host computer 3, their data may be transmitted sequentially, simultaneously to maximum storage capacity of the transmission data buffer 7a of DCU _-1 9a .

2) Fixed station radio (DCU _-1 ) ← → mobile station radio (DCU _-2 ) The fixed station 5 radio 1 is stored in the transmission data buffer 7a of DCU _-1 9a. Send data sequentially.
The received radio 2 of the mobile station 6 is the data and stored in the reception data buffer 8b of DCU _-2 9b.

On the other hand, the wireless device 2 which has received the data
When the reception of the data is completed, sends an ACK notifying that.

On the other hand, the wireless device 1 of the fixed station 5 receives the ACK
It is confirmed and recognized that the data transmission in the wireless communication section L _R is successful by receiving the.

3) Host computer ← DCU _-1 (radio unit of fixed station) The radio unit 1 of the fixed station 5 which receives the ACK transmitted from the radio unit 2 of the mobile station 6 determines whether or not data transmission is possible. The host computer 3 is queried by ENQ and, when ACK is returned, the ACK transmitted from the mobile station 6, that is, the transmission result is transmitted.

Host computer 3 that received the transmission result
Returns an EOT to that effect.

4) DCU _-2 (mobile station radio)-> When received data is stored in the receiving data buffer 8b of the DTE DCU _-2 9b, whether or not the DCU _-2 9b can transmit data To DTE 4 by ENQ, and when ACK is returned, the received data is sequentially transmitted.

On the other hand, the DTE 4 which received the data
Notifies that when the reception of the data is completed E
Return OT to DCU _- 29b.

(4) Sequence number and data transmission management As described above, the host computer 3 (or DTE)
The data transmitted from 4) are DCU _-1 9a and D
It is temporarily stored in CU _- 29b and is used for transmission / reception control / management. Then, it controls so as to report only the communication result to the host computer 3.

Therefore, when there are a plurality of data transmitted from the host computer 3 and stored in the data buffer, it is necessary to control transmission / reception and manage them for each data. That is, there is a sequence number for that purpose. For example, which data transmission succeeded, which data transmission failed, and the like can be managed by a sequence number.

The management of DCU _-1 9a and D
It is managed by the communication control units 10a and 10b of the CU- ₂ 9b and the host computer 3. That is, the host computer 3 after the data transmission may be managed only communication result sent back from the DCU _-1 9a.

(5) Data Retransmission Procedure When Data Reception Error Occurs The communication procedure of the above (3) is the fixed station radio 1 (DCU _-1).
This is the case where the data transmission between the mobile station radio 9 (a) and the mobile station radio 2 (DCU- ₂ 9b) is successful, that is, no error occurs in the received data.

However, when an error occurs in the received data, there is no choice but to retransmit the data so that the error-free data can be received.

In FIG. 7, the communication procedure exemplifying the case where the data managed by the host computer 3 is transmitted to the DTE 4 is such that how to retransmit the data when a data error occurs in the data transmission in the wireless communication section L _R. Shows what is done to.

That is, the radio 1 of the fixed station 5 is
Transmits the data stored in the transmission data buffer 7a of _-1 9a sequentially. On the other hand, receives radio 2 of the mobile station 6 is the data and stored in the reception data buffer 8b of DCU _-2 9b while error check. Then, if there is an error in the received data, NAK (negative acknowledge character) for notifying the fact is transmitted.

On the other hand, the wireless device 1 of the fixed station 5 is
It is confirmed and recognized that the data transmission in the wireless communication section L _R has failed by receiving the. Therefore, the data is transmitted again, and the data transmission is tried. As a result, if the wireless device 2 of the mobile station can receive the data without an error, it sends an ACK to notify that fact.

Incidentally, the number of times of data retransmission is generally set to about 2 to 3 times in many cases. That is,
This is because when NAK is returned as a result of repeatedly executing retransmission, data transmission often does not succeed even if retransmission is excessively performed.

[0041]

Not only in the wireless communication section L _R but when an uncorrectable reception error occurs, the only method is to have the data source retransmit the data and receive the correct data. Absent.

However, the re-transmission of data has a problem that the data transmission efficiency is lowered in consideration of the occupied time.

On the other hand, the communication quality of the wire communication sections L ₁ and L ₂ is much higher than that of the wireless communication section L _R. This is particularly noticeable when the communicating station is a mobile station. Therefore, the information processing device (host computer 3 and DTE
When considering the data transmission efficiency between 4), the transmission efficiency of the wireless communication section L _R becomes dominant.

A technical object of the present invention is to establish a wireless communication method capable of shortening the time required for retransmitting data, thereby providing a communication system which achieves both high data transmission efficiency and communication quality. It is to be realized.

[0045]

FIG. 1 is a diagram for explaining the basic principle of the present invention, in which (a) is a block diagram showing the configuration, and (b) is
FIG. 4 is a diagram for explaining a communication procedure. Note that in (b), communication work is indicated by arrows, and the time series progresses downward in the figure.

The present invention is characterized in that the data is divided into several blocks and transmitted, and if there is a reception error, only the block with the error is retransmitted.

(1) Basic wireless communication method Information is stored in the radios 1a, 2a, ... Having the transmission data buffers 7c, 7d, ... And the reception data buffers 8c, 8d ,. A processing unit is communicably connected to each of the information processing units 3a, 4a ,.
..Data communication between the data buffers 7c, 7d, ...
.., 8c, 8d, ... is a method of performing wireless communication through the following steps.

That is, each information processing device 3a, 4a, ...
Are transmission data buffers 7c, 7d, ...
.. and the receiving data buffers 8c, 8d ,.

On the other hand, data transmission and data reception between the radios 1a, 2a, ... Are carried out by the transmission data buffer 7c (7d) of the data transmission radio 1a (2a) and the data reception radio 2a ( 1a)
With the receiving data buffer 8d (8c) of the
Divide into / N, 2 / N, 3 / N, ..., N / N and send.

On the other hand, when the data receiving side wireless device 2a receives the data transmitted by the data transmitting side wireless device 1a, the data receiving side wireless device 2a receives the transmission data to the data transmitting side wireless device 1a. To that effect, for example, ACK, NAK, etc. are transmitted and notified, and at that time, it is determined whether or not there is a reception error in the received data in each block 1 / N, 2 / N, 3 / N.
, ..., This is a wireless communication method that transmits and notifies by attaching the distinguishable information 3 / N for each N / N.

(2) Radio communication method for retransmitting only block with error In other words, in the radio communication method of (1), the data transmission side radio 2a receives the data transmitted from the data transmission side radio 1a. That is, sending ACK and NAK
When notification and information 3 / N that can determine whether or not there is a reception error in the received data for each block 1 / N, 2 / N, 3 / N, ..., N / N are received Is the block 3 / N in which the data transmission side wireless device 1a has a reception error.
It is a wireless communication method of retransmitting only.

[0052]

(1) Basic wireless communication method In the wireless communication method of the present invention, the data transmission side wireless device
1a sends the data to be transmitted in a block of a predetermined size 1 / N
, 2 / N, 3 / N, ..., N / N are divided and transmitted. On the other hand,
When there is a reception error in the data received by the data receiving side wireless device 2a, information 3 / N indicating which block has an error is transmitted / notified to the data transmitting side wireless device.

Therefore, the data transmitting side radio 1a has the transmitted data blocks 1 / N, 2 / N, 3 / N, ..., N / N.
It is possible to know which of the two has a reception error.

In the data receiving side radio 2a, each block 1 / N, 2 / N, ..., N / N of the received data is stored in the receiving data buffer 8d and is not lost. .

(2) Radio Communication Method of Retransmitting Only Block with Error By the above (1), the data transmitter radio 1a can selectively retransmit only block 3 / N with an error. it can.

Therefore, the block 3 / N having an error
The time required to retransmit data is shorter than the conventional method in which all data is retransmitted.

In the data receiving side radio 2a, other blocks 1 / N, 2 / N, ..., N / N already received have been received.
Is stored in the reception data buffer 8d, so that the original transmission data can be restored by combining with the block 3 / N that has been retransmitted and received without a reception error.

[0058]

EXAMPLES Next, examples of how the wireless communication method according to the present invention can be embodied in practice will be described.

(1) Configuration The hardware of this embodiment may have the same configuration as the conventional example shown in FIG. The only difference is the communication control software of the communication control units 10a and 10b.

That is, the transmission control includes a procedure for dividing the data to be transmitted into blocks and transmitting the data, and information indicating the block in which the ACK or NAK of the reception response signal has a reception error as a result of the data transmission. If attached, there is a procedure to retransmit the block.

On the other hand, as reception control, there is a procedure for attaching information indicating which block has a reception error to ACK or NAK as a reception response signal.

Next, a data header for transmitting data, a control header as a reception response signal, and a data block format will be described. That is, FIG.
It is a diagram for explaining the format of the header and the block data, (a) is a diagram showing the format of the data header,
(b) is a diagram showing a format of a control header, and (c) is a diagram showing a format of a data block.

1) Data header The data header has a total length of 48 bits, and its allocation is 5 bits in the command part b ₅ , 2 bits in the mode part b ₆ , 4 bits in the sending block number part b ₇ , and the last block data valid number. Department
5 bits b _8, 16-bit destination unit b _9, the transfer source unit b ₁₀
Is 16 bits.

The command section b ₅ represents the type of communication, that is, the type of individual communication or broadcast communication. The mode part b ₆ represents the type of transmission, that is, the type of the first transmission or retransmission, and the transmitted block number part b ₇ represents the number of blocks to be transmitted. By the way, in this embodiment, the maximum number of transmission blocks is set to 16 blocks.

Further, the last block data effective number part b
₈ indicates how many bytes of data exist in the final block when the data to be transmitted is divided into blocks, the transfer destination part b ₉ indicates the destination of the data (communication partner station), and the transfer source part b ₁₀ Indicates the source of the data.

2) Control header The control header has a total length of 48 bits, and its allocation is 5 bits for the command section b ₁₁ , 3 bits for the local station status section b ₁₂ , 4 bits for the instruction block number section b ₁₃ , and the retransmission request block. 4 bits in the number part b ₁₄ and the request block instruction part b ₁₅
16 bits for the transfer destination part b ₁₆ and 16 bits for the transfer destination part b ₁₆ .

The command part b ₁₁ represents the type of reception response signal such as ACK and NAK. Also, the self-station status portion b ₁₂ represents the normal / abnormal state of communication between the wireless device and the information processing apparatus of the station (host computer 3 or the DTE 4), an instruction block number portion b ₁₃ is the data transmission source The instructed total number of blocks, that is, the value of the transmission block number portion b _{7 in} the above 1) is represented as an echo back.

[0068] Further, retransmission request block number parts b ₁₄ represent the number of blocks that caused the reception error, the request block instruction section b ₁₅ represent blocks caused reception error in the bit pattern, the destination unit b ₁₆ is the Indicates the destination of the control header.

3) Data Block In this embodiment, data is divided into 16 blocks at maximum and transmitted. Then, data of 23 bytes per block is divided into blocks. However, considering the block number part b ₁₇ for identifying the respective blocks, thereby dividing the data of 24 bytes in one block.

When dividing data into blocks, BCH (Bose-Chaudhuri-Hocqueng) is used in units of 6 bytes.
hem code) Encode processing and add 21 check bits at that time.

That is, in the structure of the data block, 1 byte is allocated to the block number part b ₁₇ and then 1 to 5 bytes of data are allocated to the data part b ₁₈ . Then, after that, the check bit portion b ₁₉ is added.

[0072] Similarly, 6 to 11 of the data in the data portion b ₂₀
Assign the bytes, adds a check bit part b ₂₁ behind it, assign a 12-17 bytes of data in the data section b _22, a check bit part b ₂₃ behind it, the data unit b ₂₄
18 to 23 bytes of data are allocated to, and a check bit part b ₂₅ is added after that.

When the data block is transmitted, the interleave process is performed before the data block is transmitted.

(2) Block transmission and method of assembling received data When transmitting data from the wireless device, the data block shown in FIG. 2 (c) is transmitted after the data header shown in FIG. 2 (a). The number of data blocks depends on the size of the data to be transmitted and is 16 at maximum. On the other hand, the wireless device that has received the data is set according to the reception state.
The control header in (b) is transmitted as a response signal, and the data transmitter wireless device is notified.

By the way, the received data is subjected to deinterleaving processing and BCH decoding processing to restore the original data, but finally it is necessary to assemble the transmitted data in blocks into the original data. Further, when assembling, it is necessary to consider the assembling method when the block having the reception error is retransmitted.

FIG. 3 is a model diagram for explaining a block data transmission procedure and a received data assembling method.

That is, the storage areas of the reception data buffers 8a and 8b are divided into 16 blocks and managed, and the data blocks are stored in the order of the block number of each data block.

In FIG. 3, DCU _{-1 of the} data transmitter radio
The example illustrates a case where data is transmitted from the DCU- ₂ to the data receiving radio device. By the way, in the figure, the data is divided into 16 blocks and transmitted, and the block numbers are 1/16, 2/16, 3/16, ..., 16/16.

The data block having the reception error is not stored in the reception data buffers 8a and 8b, but is stored when it is received without error after receiving the retransmission.

That is, in the example of FIG. 3, when the data transmitting radio unit (DCU _-1 ) completes the transmission of data blocks 1/16 to 16/16, the data receiving radio unit (DCU _-2 ) Send and notify that the block number of the block that generated NAK and reception error is 7/16, and the data transmitter radio (DCU _-1 ) that received the notification retransmits the block 7/16 of data. It is shown that.

Then, the data receiving side radio (DCU _-2 )
If the data block 7/16 that has been retransmitted can be received without error, ACK indicating that fact is transmitted and notified. Further, the received data block 7/16 is stored in a predetermined storage area of the reception data buffers 8a, 8b, that is, the seventh storage area.

As a result of the above, the reception data buffers 8a, 8b
Contains all blocks of data 1/16, 2/16, 3/16,
..., 16/16 is stored. Therefore, the data can be obtained by sequentially reading the reception data buffers 8a and 8b.

(3) Communication Procedure The features of the present invention are collectively expressed in the operation of the DCU incorporated in the radio, that is, the communication control procedure thereof. still,
It is the communication control units 10a and 10b that control the communication control of the DCU _-1 9a and DCU _-2 9b, and the communication control units 10a and 10b.
It is a control unit of radios 1 and 2 linked to b. However, FIG. 6 does not show the control units of the wireless devices 1 and 2.

Then, the procedure of communication control by the DCU will be described. The BCH encoding process, the BCH decoding process, the interleave process, and the deinterleave process will be omitted.

FIG. 4 is a flow chart for explaining the communication procedure of the data transmitting side radio equipment. (A) is a diagram for explaining the procedure for transmitting data, and (b) is for explaining the processing procedure for the reception response signal. Fig. Further, FIG. 5 is a flowchart for explaining the communication procedure of the data receiving side wireless device.

1) Data Transmission Procedure That is, the numerical value 1 is assigned to the pointer m in step S101, and the data to be transmitted is divided into blocks in step S102 (here, it is assumed that the data is divided into a blocks). Then, in step S103, the effective number of data in the last block is obtained (here, it is assumed that the number is b bytes).

Then, the data header in which the values a and b are set is transmitted in step S104. The other data set in the data header is set according to the type of communication and the transfer destination.

Then, in step S105, the m-th data block is transmitted. That is, the first data block is transmitted. Then, in step S106, it is determined whether or not the data block is the final block. If it is not the final block, the numerical value 1 is added to the pointer m in step S107, and the second data block is transmitted in step S105.

When the data has been transmitted up to the final block as described above, the data transmission work is completed.

2) Processing Procedure of Reception Response Signal The processing of the reception response signal is the processing when the result of transmitting the data in 1) above is returned and notified from the data receiving side radio.

That is, in step S201, it is determined whether or not a control header for reception response is received, and if received, it is determined in step S202 whether or not there is a data retransmission request, and there is a retransmission request. If so, the retransmission request data block is retransmitted in step S203.

However, before retransmitting the data block requested to be retransmitted, a data header meaning retransmission is transmitted, and then the data block is transmitted.

3) Data reception procedure That is, it is determined whether or not the data header is received in step S301, and only when the data header is received, the process proceeds to step S302, and the number a of data blocks and the data of the last block Read the effective number b.

Subsequently, an error check is performed for each received data block in step S303, it is determined in step S304 whether or not there is an error, and if there is no error, it is stored in the reception data buffer in step S305.

Then, in step S306, it is determined whether or not it is the final block, and if it is not the final block, step S303.
Return to and repeat error check and data storage.

However, if it is determined in step S304 that the received data has an error, the block number of the data block is stored in step S307.

When the work of receiving all the data blocks is completed, the reception result is set in the control header and transmitted as a reception response signal to notify the data transmitting side wireless device.

(4) Implementation results When the data transmission rate in the wireless communication section is 2400 bps,
It took about 1 time to send 16 blocks of data.
It was 86 seconds. When the block was retransmitted assuming that there was one block reception error in 16 blocks, the time required for the retransmission was about 0.14 sec.
In other words, it took about 2.00 seconds in total.

By the way, in the conventional communication method of retransmitting all data, one data transmission is repeated twice, so that about 3.72 sec is required.

[0100]

As described above, according to the wireless communication method of the present invention, data is divided into several blocks and transmitted, and if there is a reception error, only the block with the error is retransmitted. By doing so, the time required to retransmit the data can be significantly reduced.

Therefore, it is possible to improve the data transmission efficiency, and at the same time, it is possible to construct a wireless communication system excellent in data reliability and communication quality.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a basic principle of the present invention, (a) is a block diagram showing a configuration, and (b) is a diagram illustrating a communication procedure.

2A and 2B are diagrams illustrating a header and a format of blocked data, FIG. 2A is a diagram showing a data header format, and FIG. 2B is a diagram showing a control header format.
(c) is a diagram showing a format of a data block.

FIG. 3 is a model diagram illustrating a transmission procedure of blocked data and a method of assembling received data.

FIG. 4 is a flowchart illustrating a communication procedure of a data transmission side wireless device, (a) is a diagram illustrating a procedure for transmitting data, (b) is a diagram illustrating a processing procedure of a reception response signal,
Is.

FIG. 5 is a flowchart illustrating a communication procedure of a data receiving side wireless device.

FIG. 6 is a diagram illustrating a wireless communication system including a data buffer, (a) is a diagram illustrating a communication system configuration,
(b) is a figure explaining the format of communication data.

FIG. 7 is a diagram illustrating a communication procedure.

[Explanation of symbols]

1,1a Radio 2,2a Radio 3 Host computer 3a Information processing equipment 4 DTE (Data Terminal Equip)
ment) 4a Information processing device 5 Fixed station 6 Mobile station 7a, 7b, 7c, 7d Transmission data buffer 8a, 8b, 8c, 8d Reception data buffer 9a DCU _-1 (DCU: Data Com)
unication Unit) 9b DCU _-2 10a, 10b Communication control unit L ₁ , L ₂ Wired communication section L _R Wireless communication section TX _DATA-1 , TX _DATA-2 transmission data RX _DATA-1 , RX _DATA-2 reception data b ₁ Command part b ₂ Vehicle number part b ₃ Sequence number (No) part b ₄ Data part b ₅ Command part b ₆ Mode part b ₇ Send block number part b ₈ Final block Data effective number part b ₉ Transfer destination part b ₁₀ Transfer source Part b ₁₁ Command part b ₁₂ Local station status part b ₁₃ Number of instruction blocks part b ₁₄ Number of retransmission request blocks part b ₁₅ Request block instruction part b ₁₆ Transfer destination part b ₁₇ Block number part b ₁₈ , b ₂₀ , b ₂₂ , b ₂₄ Data part b ₁₉ , b ₂₁ , b ₂₃ , b ₂₅ Check bit part

Claims (2)

[Claims] 1. A data buffer for transmission (7c, 7d, ...)
An information processing device is communicatively connected to a wireless device (1a, 2a, ...) provided with a reception data buffer (8c, 8d, ...), and each information processing device (3a, 4a, ...) is connected.・ ・) Data communication between the above-mentioned data buffers (7c, 7d, ...) (8c, 8d, ...
・) Wireless communication through each of the information processing devices (3a, 4a, ...)
・ ・) Send and receive data to and from the sending data buffers (7c, 7d, ・ ・ ・) and receiving data buffers (8c, 8d, ・ ・ ・) , ...) Data transmission and reception between the data transmitting side wireless devices (1a) and (2a) and the data receiving side wireless devices (2a) and (1a) Data buffers (8d) and (8c) for transmission, and transmit the transmission data () in blocks of predetermined size (1 / N, 2 / N, 3 / N, ... N / N) ), And the data transmitted by the data transmitter radio (1a) ()
When the data receiving side wireless device (2a) receives the data, the data receiving side wireless device (2a) indicates to the data transmitting side wireless device (1a) that the transmission data () has been received (ACK, NAK). At the same time as transmitting / notifying, whether or not there is a reception error in the received data () at each block (1 / N, 2 / N, 3 / N, ...
・ A wireless communication method characterized in that the information (3 / N) that can be identified for each N / N) is attached and sent. 2. The wireless communication method according to claim 1, wherein the data () transmitted from the data transmission side wireless device (1a) is
Each block (1 / N, 2 / N, 3) determines whether or not the data receiving side wireless device (2a) has received (ACK, NAK) transmission / notification and whether the received data () has a reception error. / N, ... N / N)
When the information (3 / N) that can be discriminated for each is received, the data transmission side wireless device (1a) retransmits only the block (3 / N) having a reception error. Wireless communication method.