JPH0621922A - Radio communication method - Google Patents

Abstract

PURPOSE:To improve the data transfer efficiency and also to control the state of the opposite party station of communication in regard of a radio communication method which performs the communication of data between the information processors. CONSTITUTION:The information processors 3a and 4a are communicatably connected to the radio equipments 1a, 2a,... which contain the transmitting data buffers 7c, 7d,... and the receiving data buffers 8c, 8d,...respectively. The data are transferred through these buffers 7c, 75,..., 8c, 8d,.... When the equipment 2a receives the data that are received by the equipment 1a, the equipment 2a transmits an ACK to the equipment 1a to report the reception of data together with transmission of at least the self-station state information S1 showing the connection or disconnection of the equipment 2a and the processor 4a.

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 and knowing the status of a communication partner station when data communication between information processing devices is performed 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) 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 therein that both improvement of data transmission efficiency and improvement of operating rate of the host computer can be achieved at the same time, and its high effectiveness is proved.

On the other hand, even with the above communication method, when the radio equipment to which the DTE is connected is a mobile station, the communication quality thereof constantly fluctuates, and since it is a mobile station, the radio equipment and the DT are connected.
The connection with E may be broken or disconnected due to force majeure. However, the host computer and the wireless device (fixed station) connecting the host computer have no means for recognizing this. The reverse is also true.

Therefore, there is a demand for a wireless communication method capable of performing data communication while recognizing the state of the communication partner station.

[0009]

2. Description of the Related Art (1) Configuration of a communication system in which a radio device has a data buffer FIG. 4 is a diagram for explaining a wireless communication system having a data buffer, (a) is a diagram for explaining the communication system configuration,
(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. 4A, the data buffers 7a, 8a (7b, 8b) and the communication control unit 10a (10
b) is unitized into one unit, and DCU _-1
9a and DCU _-2 9b (DCU: Data Communication U)
(nit) is built into the radios 1 and 2.
It should be noted that 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. 5 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
Will notify you when the data is received 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.

[0035]

The wireless communication method as described above has an advantage that both improvement of data transmission efficiency and improvement of operating rate of the host computer are compatible.

By the way, from the host computer 3 to DT
The data transmitted to E 4 is stored in the reception data buffer 8b in the DCU _-2 9b of the radio 2, and then the DTE
4 is transmitted. Therefore, even if the DTE 4 is not connected or the connection cable is broken, the received data is stored in the receiving data buffer 8b and is not lost. This is one of the strengths.

However, from the radio 2 of the mobile station 6 to the DTE
4 is in a state in which data cannot be transmitted, the fixed station 5
Host computer 3 cannot recognize it. Therefore, the host computer 3 cannot recognize whether the transmitted data has been confirmed by the operator who manages the DTE 4.

A technical object of the present invention is to efficiently perform data transmission by establishing a wireless communication method in which an information processing apparatus as a data transmission source can recognize the state of a data transmission destination, that is, a communication partner station. Together with this, it is possible to manage the state of the communication partner station.

[0039]

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 information for reporting the status of its own station is attached to a response notifying that data has been received.

(1) Basic radio communication method Information is stored in radios 1a, 2a, ... Having transmission data buffers 7c, 7d, ... And 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 receiving data buffers 8c, 8d, ... Sends and receives data to and from each radio device 1a, 2a ,.
Data transmission and data reception between the data transmitting side wireless device 1a (2a) transmission data buffer 7c (7d) and the data receiving side wireless device 2a (1a) receiving data buffer 8d (8c) To do.

Then, when the other 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 sends the data to the data transmitting side wireless device 1a. In addition to transmitting and notifying that the transmitted data has been received, that is, ACK,
This is a wireless communication method in which at least the own station status information S ₁ indicating whether or not the data receiving side wireless device 2a and the information processing device 4a connected thereto are connected is transmitted and notified.

(2) Wireless communication method for notifying the information processing apparatus that is the data transmission source of the transmission result. That is, in the wireless communication method of (1), the data transmitted from the data transmission side wireless device 1a ... When the data transmission side wireless device 1a receives the ACK transmission / notification that the data receiving side wireless device 2a has received and the transmission / notification of the local station status information S ₁ , the data transmission side wireless device 1a
Is a wireless communication method for notifying the information processing device 3a connected thereto of these notifications ACK, S ₁ .

[0045]

(1) Basic wireless communication method In the wireless communication method of the present invention, when the data receiving side wireless device 2a receives data ...
ACK indicating that the data has been received and at least information S ₁ indicating whether or not the local station radio 2a and the information processing device 4a are connected, and notifies the data transmission side radio 1a.

Therefore, the data transmitting side radio 1a can know whether or not the data has reached the partner station, and at the same time, can know whether or not the information processing device 4a is connected to the radio 2a. .

As the local station status information S ₁ attached in the previous data reception response, the status of the receiving buffer of the local station, the received electric field strength, etc. can be exemplified. That is, if the information required by the other station for the own station,
It is not particularly limited.

The data reception response is not limited to ACK, but NAK (negative acknowledge character act).
er) or other response signal.

By the way, even if there is an accident such as disconnection or disconnection in the connection between the data receiving radio 2a and the information processing device 4a connected thereto, the received data is received in the radio 2a. Since the data is stored in the data buffer 8d for data, the data can be transmitted to the information processing device 4a after the accident is repaired.

(2) Wireless communication method for notifying the information processing apparatus that is the data transmission source of the transmission result. Information ACK (NAK, ...) That the data transmission side wireless device 1a has responded / notified by the data reception side wireless device 2a.・), S ₁ ,
By notifying the connected information processing device 3a, the information processing device 3a can recognize the result of the data transmission and the state of the communication partner station.

[0051]

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, as the reception response signal, the status information of the own station may be attached to ACK, NAK, etc. and transmitted / notified.

Of course, the application program A
PL _-1 , APL _-2 need to be changed to a program capable of managing communication partner station status information. For example, is the wireless device of the communication partner station and the information processing device connected? ,
How strong is the received electric field strength? , Etc. may be managed in a list form for each communication partner station.

Next, the format of the reception response signal returned by the wireless device that receives the data will be described. That is, FIG. 2 is a diagram for explaining the format of the reception response signal,
(a) is a diagram showing a format of a reception response signal between wireless devices, and (b) is a diagram showing a format of a reception response signal between the wireless device and the information processing device.

1) Reception response signal between radios The response signal has a total length of 47 bits, and its allocation is 5 bits in the command section b ₅ , 2 bits in the local station status information section b ₆ , and 16 in the transfer destination section b ₇ . There are 24 bits as spare b ₈ in addition to bits.

The command part b ₅ represents the data reception state in the wireless communication section. For example, the bit configuration corresponds to ACK when the data can be normally received, and the bit configuration corresponds to NAK when there is an uncorrectable error.

The local station status information section b ₆ indicates whether or not the communication in the wired communication sections L ₁ and L ₂ between the wireless devices 1 and 2 and the host computer 3 or the DTE 4 is normally performed. ,
The transfer destination part b ₇ represents a partner station that transmits / transfers the reception response signal.

[0058] 2) acknowledgment signal response signal between the radio and the information processing apparatus is set to 251 bytes in total length, the assignment 2 byte status unit b _9, 3 bytes vehicle number unit b _10, the sequence number portion There are 4 bytes in b ₁₁ and 242 bytes in part b ₁₂ that represents the partner station status information and wireless section status.

The status section b ₉ represents the type of communication, that is, the type of individual communication, broadcast communication, or the like. Also,
Vehicle number unit b ₁₀ represents a vehicle management number of the mobile station in this example a communication partner station, the sequence number portion b ₁₁ represent the management number of the data transmission, part b ₁₂ representing the partner station status information and the radio unit status The information of the command part b _{5 and} the information of the local station status information part b _{6 in} the above 1) are attached.

(2) DCU Communication Control 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, the control units of the wireless devices 1 and 2 are not shown in FIG.

The procedure of communication control by the DCU will be described. 3A and 3B are flowcharts for explaining a communication control procedure of the DCU, where FIG. 3A is a diagram illustrating a transmission procedure and FIG. 3B is a diagram illustrating a reception procedure.

1) Transmission procedure In other words, it is determined in step S101 whether or not there is data to be transmitted, and if there is data to be transmitted, step S10.
2, the type of communication, that is, the transmission form is selected from the command part b ₁ shown in FIG. 4 (b).

Subsequently, the transmission data is encoded in step S103 and transmitted in step S104.

Of course, if there is no data to be transmitted in step S101, no transmission is performed.

2) Reception Procedure That is, the received signal is encoded in step S201, and it is determined in step S202 whether it is a control header or data. The control header mentioned here corresponds to the command part b ₁ , the vehicle number part b ₂ and the sequence number part b ₃ shown in FIG. 4 (b).

Next, if it is a control header, step S20.
Proceed to 3 and acquire the type of received data from the control header. For example, whether it is individual communication of data or broadcast communication, or response communication for notifying the result of receiving transmitted data.

Then, in step S204, data reception preparation is performed according to the type of received data.

On the other hand, if it is determined in step S202 that the received data is data, an error check is performed on the received data in step S205, it is determined in step S206 whether all the data has been received, and all the data has been received. In that case, the reception result is sent as a response.

For example, if reception is possible without error, AC
If it is K, and there is an uncorrectable error, NAK is sent in response. In addition, wired communication sections L ₁ and L ₂ between the wireless device and the information processing device (host computer 3 or DTE 4)
If the communication of is successful, the information S ₁ is attached, and if it is not successful, S ₂ is attached and the response is sent.

Whether or not the data transmission in the wired communication section is normally performed depends on the BSC procedure or FT which is the transmission procedure.
It can be confirmed by a known technique such as S procedure and TTY procedure. Therefore, the DCU sends the transmission result to the information S ₁ or S
Attach as ₂ and send response.

[0071]

As described above, according to the wireless communication method of the present invention, the data transmission source information processing apparatus can recognize the state of the data transmission destination, that is, the communication partner station in real time.

Further, even if the wireless device and the information processing device are not connected at the communication partner station, the transmission result of the wireless communication section and the transmission result of the wired communication section can be known.

Therefore, whether the transmitted data has normally reached the information processing device of the communication partner station, or is it necessary to retransmit the data because a reception error has occurred in the radio device of the communication partner station? , The transmitted data has not reached the information processing device of the communication partner station, but since the transmitted data is stored in the receiving data buffer of the communication partner station radio, is it necessary to retransmit the data? , Etc. can be determined.

As a result, it becomes possible to efficiently perform data transmission and to manage the status of the communication partner station in real time.

[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 illustrating a format of a reception response signal,
(a) is a diagram showing a format of a reception response signal between wireless devices, and (b) is a diagram showing a format of a reception response signal between the wireless device and the information processing device.

FIG. 3 is a flowchart illustrating a communication control procedure of the DCU, (a) is a diagram illustrating a transmission procedure, and (b) is a diagram illustrating a reception procedure.

FIG. 4 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. 5 is a diagram illustrating a communication procedure.

[Explanation of symbols] 1,1a radio 2,2a radio 3 host computer 3a information processing device 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 section b ₂ Vehicle number section b ₃ Sequence number section b ₄ Data section b ₅ Command section b ₆ Own station status information section b ₇ Transfer destination b ₈ Spare b ₉ Status section b ₁₀ Vehicle number section b ₁₁ Sequence number (No) Part b ₁₂ Partner station status information + wireless section status

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, ...)
・ ・) Sends / receives data to / from the transmission data buffer (7c, 7d, ・ ・ ・) and the reception data buffer (8c, 8d, ・ ・ ・), and each radio (1a, 2a , ...) Data transmission and reception between
a) Transmitting data buffer (7c) (7d) of (2a) and receiving data buffer (8d) (8c) of data receiving side radio (2a) (1a). Data transmitted by the radio (1a) (
...) is received by the other data receiving radio (2a), the data receiving radio (2a) becomes the data transmitting radio.
(1a) transmits / notifies that the transmission data (...) has been received (ACK), and at that time, at least the data receiving side wireless device (2a) and the information processing device (2a) connected thereto ( 4a) is attached and transmitted / notified with own station status information (S ₁ ) indicating whether or not the wireless communication method is connected. 2. The wireless communication method according to claim 1, wherein the data transmitted from the data transmission side wireless device (1a) (.
..) is received by the data receiving radio (2a) (ACK)
When the data transmission side wireless device (1a) receives the transmission / notification of, and the transmission / notification of the local station status information (S ₁ ), the data transmission side wireless device (1a) receives those notifications (ACK, S ₁ )
Is notified to the connected information processing device (3a).