JPH0621861A - Radio communication method - Google Patents

Abstract

PURPOSE:To provide the radio communication system in which data communication is not restricted by a data length sent from a radio equipment at once and optional data are freely sent/received with respect to the method implementing data communication between information processing units by radio communication. CONSTITUTION:The method is a method sending/receiving one consecutive data (2) in excess of a prescribed data format decided in advance, a data sender side radio equipment 1a (2a) sends data (2) as division data and sends the data with information F2 representing remaining of succeeding data added thereto and sends divided last data (2)-5 with information F1 representing the purport added thereto. On the other hand, a data receiver side radio equipment 2a (1a) discriminates whether or not information data are in existence based on the added information sets F1, F2, links sequentially the reception data when succeeding data are in existence and make the reception of the data (2) complete with the link of the last data (2)-5 with the information F1 representing the last data added thereto.

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, in data communication, it is general that a format for transmitting data is predetermined.
Data can be transmitted and received only by performing communication based on the promise.

By the way, in wireless communication in which at least one wireless station moves, the amount of data that can be transmitted in one data transmission is not so large. The reason is that the communication quality is likely to change. That is, if the data is too long, the communication quality changes during data transmission, and a reception error is likely to occur. Therefore, the maximum amount of data is limited in advance when determining the data format.

However, this imposes restrictions on the data that can be transmitted, and has the disadvantage that long data that exceeds a predetermined data format cannot be transmitted.
Of course, reception is also impossible.

[0008] Therefore, there is a demand for a method capable of communicating even data having a size exceeding the amount of data that can be transmitted by the wireless device at one time.

[0009]

2. Description of the Related Art When an information processing device is connected to a wireless device to perform data communication by wireless communication, the communication quality of wireless communication dominates the data transmission efficiency. Therefore, there is a communication method that prevents data communication from being directly affected by the communication quality of wireless communication.

The communication method is a communication method in which a data buffer for transmission and a data reception is provided in a wireless device, and independence is given to communication between wireless devices and communication control thereof. Incidentally, this communication method is disclosed in Japanese Patent Application No. 274214 of 1991. Therefore, this communication method will be described as a conventional example.

(1) Configuration of a communication system in which a wireless device has a data buffer FIG. 5 is a block diagram for explaining a wireless communication system having a data buffer.

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. 5, the data buffers 7a, 8a (7b, 8b) and the communication control unit 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 radios 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.

(2) Data Flow A description will be given of how the 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 FIGS. 6A and 6B are views for explaining a communication procedure and a message text format. FIG. 6A is a view showing the communication procedure and FIG. 6B is a view showing the message text format. Note that in (a), communication work is indicated by arrows, and the 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) When the host computer → DCU _-1 (fixed station radio transceiver) host computer 3 transmits the data to the DCU _-1 9a, DCU _-1 9a stores the data in the transmission data buffer 7a.

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

On the other hand, the wireless device 2 which has received the data notifies the ACK (A (A
send a cknowledge character).

On the other hand, the wireless device 1 of the fixed station 5 uses the previous 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 has received the ACK transmitted from the radio unit 2 of the mobile station 6 transmits the ACK transmitted from the mobile station 6.
That is, the transmission result is transmitted to the host computer 3.

[0027] 4) DCU _-2 (mobile station radio) → the DTE DCU _-2 9b stores the received data in the reception data buffer 8b of the DCU _-2 9b transmits the received data to the DTE 4 .

(4) Communication Text Format (Data Format) FIG. 6B shows an example of the communication text format of the wireless communication section L _R. That is, the header portion D ₁ including a communication control signal for individual communication or broadcast communication and the data portion D ₂ which is a transmission data portion are formed, and the data portion D ₂ has a maximum of 368 bytes.

[0029]

As shown in FIG. 6 (b), when transmitting data in data communication, data transmission is performed according to a predetermined format. Further, there is generally a restriction on the amount of data that can be transmitted in one data transmission. In the example of FIG. 6 (b), the maximum is 368 bytes.

Therefore, if there is more data than can be transmitted in one data transmission,
Data transmission, that is, data transmission cannot be performed.
For example, assuming that there is data in which one data is composed of 398 bytes, the data cannot be transmitted in the above example.

There is also an operation example in which there is a constraint such that such long data is not created in advance.

A technical problem of the present invention is that by establishing a communication method capable of transmitting and receiving a large amount of data, it is possible to perform data communication which is not restricted by the data length that the radio can transmit at one time and freely transmit arbitrary data. The purpose is to construct a wireless communication system capable of transmitting and receiving.

[0033]

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 long data is divided into data parts of a size that can be transmitted and then transmitted, and that the receiving side combines these data and assembles and restores them.

That is, the information processing devices 3a, 4a, ... And the wireless devices 1a, 2a, ... Are communicably connected, and the data communication between the information processing devices 3a, 4a ,. When performing the communication, and when the wireless devices 1a, 2a, ... Send and receive data according to a predetermined data format that is determined in advance,
This is a method of transmitting and receiving one continuous data which exceeds the data amount defined in the data format.

The communication procedure is as follows.

1) Transmission procedure of data transmission side radio 1a (2a) The data illustrated in FIG. 1 (b) exceeds the transmittable amount of one time.
Although it is a large amount of data,
Data of a predetermined size set on the mat_-1, _-2 , ...
・ 、_-FiveSplit and send.

At the time of the transmission, the data is divided and transmitted.
Each data_-1,_-2,_-3, _-FourContinuous data
_-2,_-3,_-Four,_-Five, Is left, the transmission data
Data_-1,_-2,_-3,_-FourInformation F to that effect₂To
Attach and send. Also, the end of the above divided data
data from_-FiveIs information F indicating that it is the last data.
₁Attach and send.

2) Reception procedure of the data receiving radio 2a (1a) The data receiving radio 2a (1a) receives the received data- ₁ ,
It is judged from the attached information F ₁ and F ₂ whether or not there is continuous data at _-2 , _-3 and _-4 .

Then, the received data_-1,_-2,_-3,
_-FourContinuous data_-2,_-3, _-Four,_-FiveThat there is
Information F₂If attached, those received data
_-1,_-2,_-3,_-FourSequentially combine the
Information F indicating that it is data ₁The receiving device with
Data_-FiveComplete the reception of one data by combining
It

The wireless communication method is as described above.

[0042]

In the present invention, data to be transmitted / received- ₁ ,
Whether or not _-2 , _-3 , _-4 and _-5 are divided can be recognized from the attached division information F ₁ and F ₂ .

That is, data _-1 , _-2 , to which information F ₂ indicating that continuous data remains is attached
_-3 , _-4, and if the information F ₁ indicating that it is the last data is attached to the data- ₅ to be transmitted / received subsequently, recognize that the data up to the data- ₅ is one data. You can

That is, the data- ₁ to which the data division information F ₂ is attached is attached to the data- ₁ to which the division information F ₁ is attached.
_-A total of up to _-5 is one data. Therefore, the original data can be restored by combining the received data _-1 to _-5 . As a result, the data length that can be transmitted is not restricted by the data format, and it is possible to transmit / receive data having an arbitrary data length.

[0045] Incidentally, after the divided information data _-5 F ₁ is attached is transmitted and received, if the division information F ₁ is data attached is transmitted and received, that the data is not data to be combined with other data Can be determined to represent. This is because the division information F ₂ is not attached to the data- ₅ transmitted / received before the reception data to which the division information F ₁ is attached.

Therefore, these two pieces of division information F ₁ , F 2
Data transmission information of any data length is possible with only ₂ .

[0047]

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 is a procedure of dividing long data and transmitting with the information meaning the divided data attached, and the reception control is to combine the received data based on the attached information. It is a procedure.

On the other hand, in the present embodiment, as a method of attaching division information which means division data, a method of adding the division information to a frame synchronization signal used in data transmission is adopted.

FIG. 2 is a diagram for explaining the format of the communication text that is actually transmitted and received, and is a diagram for explaining the frame synchronization signal.

That is, in the format of the communication text of this embodiment, the bit synchronization section B ₁ and the frame synchronization section B are placed before the section B ₃ composed of the header having various communication control information and the data following the header. ₂ and are provided. Then, division information is added to the frame synchronization signal of the frame synchronization unit B ₂ .

The information "A" shown in FIG. 2 indicates that it is a bit pattern represented by a binary number "111011001010000", and the information "B" is an inverse pattern thereof "0001001101".
This indicates that the data is 01111 ". That is, the configuration is such that it is determined whether or not it is divided data from the bit patterns" A "and" B "of the frame synchronization unit.

(2) Communication procedure The communication procedure of this embodiment can be realized during the operation of the DCU incorporated in the radio, that is, during the communication control procedure. Incidentally, a communication control unit 10a, 10b is the charge of the communication control of the DCU _-1 9a and DCU _-2 9b, also, a control unit of radio 1,2 linked with each the communication control unit 10a, a 10b. However, the control units of the radios 1 and 2 are not shown in FIG.

Therefore, the procedure of communication control by the DCU will be described.

FIG. 3 is a flow chart for explaining a communication procedure, (a) showing a data transmission procedure, and (b) showing a data transmission handshake control procedure. Also,
FIG. 4 is a flowchart illustrating a data receiving procedure.

In the present embodiment, the case of transmitting a large amount of divided data is referred to as "Continue transmission" in the sense that each divided data is continuous.

A reception response when the data transmitted by the continuation is received is referred to as a continuation ACK and is referred to as A.
Notated as CK _C , Last ACK is the reception response when the last data of the transmitted data is received.
And is referred to as ACK _L. It should be noted that, in transmissions other than the continuation transmission, it is a promise to simply receive and respond to ACK.

On the other hand, the bit pattern "B" of the frame synchronization signal is used when there is subsequent divided data and is "A".
Is used in the case of the last data of the divided data or in the case of data that can be transmitted in one transmission without the need for division.

1) Data transmission procedure (FIG. 3 (a)) That is, it is judged whether or not the data to be transmitted exists in the transmission data buffer in step S101. If there is data to be transmitted, the data is transmitted once. In step S102, it is determined whether or not the data length that can be transmitted is exceeded. If it exceeds, the frame synchronization signal "B" is attached to the data divided in step S104 and the data is transmitted.

However, if it is determined in step S102 that the data to be transmitted has a data length that can be transmitted in one transmission, the frame synchronization signal "A" is attached to the data and the data is transmitted.

2) Handshake control procedure for data transmission (FIG. 3 (b)) The data transmitting side wireless device immediately shifts to the receiving state after one data transmission is completed, and the data receiving side wireless device transmits and returns. Receives reception response signals (ACK, ACK _C , ACK _L ).

That is, in step S201, the received response signal
Is ACK_CACK _CIf
Up S202 Send the next divided block of the transmission data
To do. But ACK_CIf not, in step S203
The transmission of the data is completed and the next data is transmitted.

The transmission in step S202 is a procedure for repeatedly executing the transmission work after step S102 in FIG. 3 (a).

3) Data receiving procedure (FIG. 4) In the data receiving side radio, whether the received data is divided and transmitted from the frame synchronization signal of the received data, or the transmission is completed by one data transmission. First, it is judged whether it is data. That is step S301.

1. Reception procedure when frame sync signal is "A", that is, the received data is stored in the reception data buffer in step S302, and then ACK is transmitted / returned in step S303. Then, in step S304, the data in the reception data buffer is transmitted to the DTE.

2. Reception procedure when the frame synchronization signal is "B", that is, the received data is stored in the receiving data buffer in the order of reception in step S305, and then in step S306 A
Send and return CK _C.

Then, in step S307, the reception of the next data is waited, and when the next data is received, the frame synchronization signal is judged in step S308. That is, when the frame synchronization signal is "B", the process returns to step S305 to store the received data in order and waits for the next received data.

However, if the frame synchronization signal is "A" in step S308, it can be determined that the received data is the last divided data. Therefore,
After storing the final data in order in the reception data buffer in step S309, ACK _L is transmitted / returned in step S310.

Then, the data sequentially stored in the reception data buffer and combined is transmitted to the DTE as one data. That is, step S304 is that.

[0071]

As described above, according to the wireless communication method of the present invention, long data is divided into data parts of a size that can be transmitted and transmitted, and the receiving side combines these data and assembles them. Can be restored.

As a result, it is possible to perform data communication which is not restricted by the data length that the wireless device can transmit at one time, and it is possible to construct a wireless communication system which is highly flexible and can freely transmit and receive arbitrary data.

[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.

FIG. 2 is a diagram for explaining an embodiment, and is a diagram for explaining a format of a communication message.

3A and 3B are flowcharts illustrating a communication procedure of the embodiment, FIG. 3A is a diagram showing a data transmission procedure, and FIG. 3B is a diagram showing a data transmission handshake control procedure.

FIG. 4 is a flowchart illustrating a communication procedure of the embodiment, and is a diagram illustrating a data reception procedure.

FIG. 5 is a block diagram illustrating a wireless communication system including a data buffer.

6A and 6B are diagrams illustrating a communication procedure and a message format, wherein FIG. 6A is a diagram showing the communication procedure and FIG. 6B is a diagram showing the message format.

[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 Transmission data buffer 8a, 8b Reception data buffer 9a DCU _-1 (DCU: Data Com)
unication Unit) 9b DCU _-2 10a, 10b Communication control section 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 D ₁ Header section D ₂ Data section B ₁ Bit synchronization section B ₂ Frame synchronization section B ₃ Header and data section

Claims (1)

[Claims] 1. A plurality of information processing devices (3a, 4a, ...) And
Connects with multiple wireless devices (1a, 2a, ...) so that they can communicate with each other,
Data between the plurality of information processing devices (3a, 4a, ...)
Data communication by wireless communication and a predetermined
According to the data format of the radio (1a, 2a, ...
・) When sending and receiving data, the data amount exceeds the data amount specified in the above data format.
The method of transmitting and receiving one data () is as follows. Each data transmission side wireless device (1a) (2a)
Data of a predetermined size defined in the data format (
_-1,_-2 , ...,_-Five) And send it,
Each data to be divided and sent (_-1,_-2,_-3,
_-Four) Continuous data (_-2,_-3,_-Four,_-Five) Is left
If the transmission data (_-1,_-2,_-3,
_-Four) Indicates that information (F₂) Attached and sent,
The last data of the above divided data (_-Five)
Information indicating that it is later data (F ₁) Is attached and transmitted, while each of the data receiving radios (2a) (1a)
(_-1,_-2,_-3,_-Four) Has continuous data
Whether the attached information (F₁, F₂) And the received data (_-1,_-2,_-3,_-Four) Consecutive days
(_-2,_-3,_-Four,_-Five) Information (F₂) Is
If it is attached, those received data ( _-1,
_-2,_-3,_-Four) Are sequentially combined and the last data
Information (F₁) Is attached to the received data
(_-Five) Is combined to complete the reception of one data ()
A wireless communication method characterized by: