JPH09231149A - Radio data communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove uncertainty peculiar to a radio line by arranging agents on both ends of a radio section at the time of executing data communication between computers through the radio line. SOLUTION: A transmission instruction is sent from the agent 21 to a first radio equipment 1. When a call cannot be originated from the first radio equipment owing to a radio wave situation, the call cannot be received for response waiting from a second radio equipment 2, and call origination is not completed. A call non-completion notice is sent to the first agent 21 as a signal or a parameter showing the state of communication from the first radio equipment 1. The first agent 21 sends the call instruction again to the first radio equipment 1 without giving a notice to the first computer 10. When the call can be originated to the second radio equipment 2, an incoming notice is set to the second computer 20 through the second agent 2 from the second radio equipment 2. Thus, connection by the radio line is formed between the radio equipments 1 and 2.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wireless data communication method and a communication device using the same. In particular, PHS
(Personal Handy Phone System), PDC
The present invention relates to a wireless data communication method for transmitting data through a wireless device such as (personal digital cellular: digital mobile phone) and a communication device using the wireless data communication method.

[0002]

2. Description of the Related Art As a configuration of such a communication device, there is a configuration shown in FIG. In the figure, first and second computers 10 and 20 are data generation and processing devices. The data generated from the first and second computers 10 and 20 is transmitted / received through the wireless line 3 by the wireless devices 1 and 2 such as PHS and PDC.

In such a configuration, data error during communication, momentary disconnection, forced disconnection of communication,
Flexible handling according to the situation at the time of connection failure at the time of calling (for example, processing according to the situation or not,
It is difficult to change the timing, etc.).

Further, as shown in FIG. 33, communication software called an agent 21 is placed on a computer which is a platform between the computers 20 and 10 which are in a server-client relationship, or a dedicated processing device. There is a configuration that assists the wireless communication processing by placing it on the vehicle.

In conventional communication without an agent, when the line is forcibly disconnected during communication due to deterioration of the wireless line state, etc., a signal indicating this is directly sent from the wireless device to the computer. The session between computers is then interrupted. In order to recover it, the computer or the user side has to take measures such as redialing, and there is a problem that the session must be restarted from the beginning.

Further, in the communication in which one agent 21 is arranged as shown in FIG. 33, when the call for reconnection is made from the client side (computer 10 and wireless device 1 side) where the agent 21 is not arranged. However, there is a problem that it is not versatile because it has no choice but to realize the same contents as the agent 21 by the function of a specific application corresponding to the agent 21.

Further, since the communication protocol must be terminated at both ends of the applicable section, the communication protocol cannot be converted by only one agent. Therefore, the method of arranging one agent 21 has a problem that the computers 10 and 20 operate only with a specific application corresponding to the agent 21 and are not general-purpose.

Further, in the communication in which one agent is arranged, when the call is sent from the client side where the agent is not arranged, there is no other way but to realize the same thing by the function of the specific application corresponding to the agent. There was a problem that it was not the target.

When an agent or communication control device having a special interface is inserted between the computers 10 and 20 and the wireless devices 1 and 2, a dedicated interface is added to the computers 10 and 20 or the wireless devices 1 and 2.・ There was a problem that changes were necessary.

[0010]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to reduce the transmission efficiency remarkably by retransmission or the like in the conventional communication without an agent when the line quality is bad due to the deterioration of the wireless line condition. It is an object of the present invention to provide a wireless data communication system that solves the above problem.

Further, an object of the present invention is that in the communication in which one agent is arranged, when the line quality is poor, the transmission data from the server side in which the agent is arranged can be accumulated, but in the client side in which the agent is not arranged. There is no other way but to store the data from the device by the function of a specific application, and to provide a wireless data communication system that solves the problem of not being general-purpose.

Further, the object of the present invention is a computer which is generally assumed to be wired in which the band is wider than the wireless section and there is almost no error in the conventional communication without agents or the communication in which one agent is arranged. It is an object of the present invention to provide a wireless data communication system that solves the problems that the transmission efficiency is significantly deteriorated and the operation sometimes stops because the inter-protocol protocol is directly applied to the wireless devices.

[0013]

According to a first aspect of the present invention, there is provided a wireless data communication system comprising: a first computer operatively connected to a first wireless device; In a wireless data communication system in which a second computer operatively connected to a second wireless device communicates data via a wireless line, between the first computer and the first wireless device and between the second computer and the second computer. Between the computer and the second wireless device,
Each of the first and second computers has a wireless device-to-computer interface for a computer, a computer-to-wireless device interface function for a wireless device, and is capable of operating autonomously according to a given situation. It consists of two agents.

A wireless data communication system according to a second aspect is the wireless data communication system according to the first aspect, wherein the first or second agent is the first or second computer to which the first or second agent is connected. Receive a signal or parameter indicating a request for communication from the connected wireless device, receive a signal or parameter indicating a communication state from the connected wireless device, and based on these received signals or parameters,
It is configured to perform a calculation for optimizing a communication request and a communication state.

The wireless data communication system according to claim 3 is the wireless data communication system according to claim 2, wherein the first or second agent further provides a signal or parameter for setting a communication mode to the connected wireless device. And a signal or parameter for setting a communication control method to the connected computer.

A wireless data communication system according to a fourth aspect is the wireless data communication system according to the third aspect, wherein the first or second agent communicates with each other in order to adjust the settings of the communication to be used.

A wireless data communication system according to a fifth aspect is the wireless data communication system according to the first aspect, wherein the first computer is the first computer.
When the second wireless device is called from the wireless device of
If the first agent is not connected due to the radio wave condition or the like, the first agent controls the first wireless device to re-transmit without reporting to the first computer that the first computer is not connected.

According to a sixth aspect of the present invention, there is provided a wireless data communication system according to the first aspect, wherein the first computer and the second computer respectively pass through the first wireless device and the second wireless device. When the line is forcibly disconnected during communication, the first or second agent does not notify the connected computer of the disconnection and causes the connected wireless device to retransmit.

According to a seventh aspect of the present invention, in the wireless data communication system according to the first aspect, the first computer to the second computer
When the data is transmitted to each of the computers via the first wireless device and the second wireless device, respectively, and the line quality is poor, the first agent accumulates the data from the first computer. When the line quality is good, the accumulated data is collectively transmitted from the first wireless device.

A radio data communication system according to claim 8 is the radio data communication system according to claim 1, wherein the first computer and the second computer respectively use the first wireless device and the second wireless device. The first agent, the first protocol between the first computer and the first agent is the second protocol between the first agent and the first wireless device. And the second agent converts a third protocol between the second computer and the second agent into a fourth protocol between the second agent and the second wireless device. .

A wireless data communication system according to a ninth aspect is the wireless data communication system according to the eighth aspect, wherein the first protocol is the same as the third protocol, and the second protocol is the same as the fourth protocol. It is characterized by having done.

A wireless data communication system according to a tenth aspect is the wireless data communication system according to the first aspect, wherein the first computer and the second computer are the same.
Of the first wireless device and the second wireless device, respectively.
The first or second agent monitors communication data transmitted to the wireless device, identifies the communication application on the first and second computers, and determines the communication application according to the identified communication application. A protocol between the first and second wireless devices is determined.

A wireless data communication system according to claim 11 is the wireless data communication system according to claim 1, wherein the first computer and the second computer are the same.
Of the first wireless device and the second wireless device, respectively.
The first or second agent monitors communication data transmitted to the wireless device, identifies the communication application on the first and second computers, and determines the communication application according to the identified communication application. The packet size between the first and second wireless devices is determined.

A wireless data communication system according to a twelfth aspect is the wireless data communication system according to the first aspect, wherein the first computer and the second computer are the same.
Of the first wireless device and the second wireless device, respectively.
The first or second agent monitors communication data transmitted to the wireless device, identifies the communication application on the first and second computers, and determines the communication application according to the identified communication application. An error control method between the first and second wireless devices is determined.

A wireless data communication system according to a thirteenth aspect is the wireless data communication system according to the first aspect, wherein the first computer and the second computer are the same.
Of the first wireless device and the second wireless device, respectively.
The first or second agent monitors communication data transmitted to the wireless device, identifies the communication application on the first and second computers, and determines the communication application according to the identified communication application. A band used between the first and second wireless devices is determined.

A radio data communication system according to a fourteenth aspect of the present invention is the radio data communication system according to the tenth aspect, wherein the first agent or the second agent transmits a protocol between the wireless devices according to a line quality between the wireless devices during communication. Change.

A wireless data communication system according to a fifteenth aspect is the wireless data communication system according to the eleventh aspect, wherein the first or second agent determines the packet size between the wireless devices during communication according to the line quality between the wireless devices. Change.

According to a sixteenth aspect of the present invention, in the wireless data communication system according to the twelfth aspect, the first or second agent is communicating an error control method between the wireless devices according to a line quality between the wireless devices. Change to.

A wireless data communication system according to a seventeenth aspect is the wireless data communication system according to the thirteenth aspect, wherein the first or second agent is communicating a band used between the wireless devices according to a line quality between the wireless devices. Change.

A wireless data communication system according to claim 18 is the wireless data communication system according to claim 1, wherein when one agent does not know the protocol to be used, the other agent transmits the protocol to be used by the one agent. .

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar parts will be described with the same reference numerals or symbols.

FIG. 1 is a diagram for explaining the first embodiment of the present invention. In the figure, a mobile phone terminal (PDC) 1 as a wireless terminal device and a mobile phone wireless base station 2 are connected by a wireless line 3, and the mobile phone terminal (PDC) 1 is connected as a data generation device through a data adapter 11. 1 is connected to the computer 10.

On the other hand, the mobile phone radio base station 2 is the public network 2
2 to the second computer 20. Here, according to the present invention, the agent 21 is mounted on both computers 10 and 20 as software (process).

Here, in the conventional communication without the agent, a data error during communication, a momentary interruption, which is a problem in the wireless line,
It is difficult to deal with forced disconnection of communication, connection failure at the time of calling, etc. flexibly according to the situation at that time (for example, processing is not performed depending on the situation, timing is changed, etc.) There was a problem that was.

Further, the method of arranging one agent has a problem that it is not general-purpose because it operates only with a specific application corresponding to the agent. Moreover, since the communication protocol must be terminated at both ends of the applicable section, there is a problem that the communication protocol cannot be converted by only one agent.

Further, the method of inserting the agent or the communication control device having the special interface between the computer and the wireless device has a problem that it is necessary to add or change the dedicated interface to the computer or the wireless device.

On the other hand, in the present embodiment, there is no need to change the side of the portable telephone terminal (PDC) 1 and the portable telephone radio base station 2 and therefore the cost increase can be avoided. However, since the agent 21 is physically separated from the mobile phone terminal (PDC) 1 as a wireless device and the mobile phone wireless base station 2 (hereinafter, these are referred to as wireless devices 1 and 2, respectively), the information of the wireless line 3 is transmitted. It is necessary to devise a method to incorporate it from a wireless device.

Therefore, in this embodiment, the mobile phone terminal 1 is connected to the wireless terminal to which the first computer 10 is connected.
The 16-core interface 12 provided separately from the data adaptor 11 is used to take in the line information 12 from the first computer 10 separately from the data.

On the other hand, on the side of the base station, the wireless line information from the base station 2 is sent to the second computer 2 by using the common line signaling network 23.
I am trying to transmit to 0.

In FIG. 2, the agent 21 is connected to the wireless device 1,
2 is an example of implementation on top. Specifically, agent 2
1 is implemented as firmware for the wireless devices 1 and 2.

In this example, as compared with the embodiment shown in FIG. 1, it is not necessary to take in the information of the wireless line from another line, so that there is an effect that the cost therefor can be reduced. Also,
The feature is that the functions of the wireless devices 1 and 2 can be flexibly changed by the agent 21.

Further, the software on the computers 10 and 20 can be used without any modification, so that there is an effect on economy and convenience. However, since it is necessary to change the wireless devices 1 and 2, the cost for that is required.

FIG. 3 is a diagram showing an embodiment having the above two intermediate characteristics. This is an example in which the agent 21 is mounted on a device between a computer and a wireless device. It is mounted on the data adapter 11 on the terminal side and on the mobile exchange 24 on the base station side. In addition, the agent 21
Is realized as firmware of each device 11, 24.

In this embodiment, the wireless devices 1, 2,
Since the computers 10 and 20 do not need to be changed, the cost can be reduced. In particular, since the base station side mounts the agent in the mobile switching device that puts together a plurality of base stations, it is more economical than the embodiment of FIG.

Since the wireless devices 1 and 2 are physically adjacent to each other and the information of the wireless line 3 can be easily taken in, no special measures are required for this purpose. In the figure, the terminal side transmits both data and line information through a 16-core interface. However, data adapters and mobile switches 24
The cost for remodeling is required.

Although the PDC (digital cellular) type terminal is used and the data adapter 11 is used in FIGS. 1 to 3, the analog cellular or the like can be replaced with a modem device.

FIG. 4 is a diagram conceptually explaining the operation of the embodiment shown in FIGS. 1 to 3. On the wireless terminal side and the wireless base station side, the agent 21 is the first computer 1
Requests from the wireless devices 1, 2
Accept status from.

Further, the agent 21 sends setting information to the first computers 10, 20 and the wireless devices 1, 2. The configuration of the agent 21 having such a function is shown in FIG.
Is shown in

The central component of the agent 21 is the arithmetic means 210. The calculation means 210 is the computer 10, 20.
And an information receiving means 211 and an information transmitting means 212 which are interface circuits. The wireless devices 1 and 2 are similarly connected via the information receiving means 211 and the information transmitting means 212.

Here, the interface circuits provided between the first computer 10 and the first wireless device 1 and between the second computer 20 and the second wireless device 2 are the computer 10, 2
0 has the same interface function as the interface function of the wireless device to the computer, and has the same interface function to the wireless device as the interface function of the computer to the wireless device, and depending on the given situation. And can operate autonomously.

FIG. 6 shows an example in which the agent 21 is configured as firmware on the computers 10 and 20. A CPU, a ROM, and a RAM are commonly connected to a bus (BUS) and are connected to the computers 10 and 20 and the wireless devices 1 and 2 via an I / O interface. Agent 21
Is fixedly stored in the ROM as firmware.

FIG. 7 is a sequence flow showing one operation sequence in the embodiment of FIGS. 1 to 3, and FIG. 8 is an operation flow of the corresponding agent 21.
In FIG. 7, a transmission command is sent from the first computer 10 to the first agent 21 (step S1). Here, as the transmission command, the first agent 21 receives a signal or a parameter indicating a request for communication from the connected first computer 10.

Then, the call command is sent from the agent 21 to the first wireless device 1 (step S2).
If the first wireless device 1 cannot make a call due to the radio wave condition or the like, the waiting for a response from the second wireless device 2 cannot be received and the call is incomplete. As a signal or a parameter indicating the communication state from the first wireless device 1, a call origination incompletion notification is sent to the first agent 21 (step S3).

In response to the call origination incompletion notification, the first agent 21 sends a call origination command again to the first computer 10 without notifying the first computer 10. At this time, if a call can be made to the second wireless device 2 (step S5), an incoming call notification is sent from the second wireless device 2 to the second computer 20 through the second agent 21 (step S6). .

In response to the notification of the incoming call, a response command is returned from the second computer 20 through the second agent 21 to the second wireless device 2. As a result, a wireless connection is formed between the first wireless device 1 and the second wireless device 2 (step S8).

After this, a connection completion notice is sent from the first wireless device 1 to the first computer 10 and from the second wireless device 2 to the second computer 20, respectively (step S9). . This enables data communication between the first wireless device 1 and the second wireless device 2 (step S
10).

Referring to FIG. 8, there is shown an operation flow of the agent 21 corresponding to the operation sequence of FIG. 7 as described above. That is, step SS1 corresponds to step S2 of FIG. Further, SS2 is in a state of waiting for a response from the first wireless device 1, and if the call is not completed in the judgment SS3 of the call origination incompletion, the process returns to step SS1 to perform the call origination again.

When the transmission is completed, the completion of connection is confirmed in step SS4. Then, the data communication between the first wireless device 1 and the second wireless device 2 becomes possible.

In conventional communication without an agent, if a connection cannot be established at the time of transmission due to radio wave conditions, etc., a signal indicating this is sent directly from the wireless device to the computer. There was a problem that we had to take measures such as making calls.

In the communication in which one agent is arranged,
When the call is sent from the client side where the agent is not arranged, there is a problem that it is not universal because there is no other way but to realize the same thing by the function of a specific application corresponding to the agent.

On the other hand, in the present invention, as shown in the sequence of FIG. 7, the agent 21 can issue a redial command, and the computer or the user does not have to take a redial process.

FIG. 9 is a diagram for explaining the operation sequence of the agent when the line is disconnected during data communication. First
If the line is forcibly disconnected during the data communication (step S10) between the computer 10 and the second computer 20 (step S11), the first and second agents 21
A disconnection is notified from the wireless devices 1 and 2 corresponding to (step S12).

On the other hand, the first or second agent 21 (the first agent 21 in the example of FIG. 9) sends a call command to the first wireless device 1 without notifying the computers 10 and 20. Send (step S13). Next, when the first wireless device 1 transmits to the second wireless device 2 (step S14) and the second wireless device 2 receives this,
Notify the second agent of the incoming call notification (step S
15).

A response command is sent from the second agent 21 to the second wireless device 2. As a result, the first and second wireless devices 1 and 2 are connected (step S17). Further, the first and second wireless devices 1 and 2 notify the corresponding first and second agents 21 of the completion of connection (step S18). Connection completion notification is sent to the first and second computers 1
0 and 20 are not notified. As a result, the first and second computers 10 and 20 resume data communication without being aware of line disconnection and reconnection.

FIG. 10 shows an operation flow of the agent 21 corresponding to the operation sequence of FIG. In normal times, data communication is controlled (step SS5). During the data communication period, the disconnection of the line is detected (step S
In step S6), it is further determined whether this disconnection is a forced disconnection (step SS7). If it is not forcible disconnection, the normal session ends and the processing is performed (step SS8).

In the case of forced disconnection, a transmission command is transmitted to the wireless device 1 (step SS9). In response to this transmission command, the wireless device 1 waits for a response (step SS
10) If the call is not completed, the above process is repeated (step SS11). When the connection is completed (step SS1
2) The data communication can be restarted.

11 to 13 are flow charts (No. 1 to No. 3) showing the processing steps of the agent 21 for automatic redialing and reconnecting, including the operation in the above embodiment.
It is.

The agent 21 sends an outgoing command to the wireless devices 1 and 2 (step S100), and waits for a response from the wireless devices 1 and 2 (step S101). If there is no response for a predetermined time, it is timed out (step S10).
2), processing for the abnormality is performed (step S103).

On the other hand, if there is a response within the predetermined time (step S101: yes), the response from the wireless device is read (step S104), and it is determined whether the call is completed (step S105).

If the call is completed, the connection process continues (A in FIG. 11). If the call is not completed, the process continues to judge the reason for disconnection (B in FIG. 11). 12, the next process differs depending on whether or not the connection is completed. If the connection is completed (step S107: yes), the communication process is continued as shown in the flow of FIG. The contents of FIG. 13 will be described later.

In FIG. 12, the connection is incomplete (step S
In the case of 107: no), it is determined whether the reason for the disconnection is a defective wireless line or another reason (step S108). If the wireless line is not defective, then FIG.
Is connected to the processing of step S117 and thereafter.

If the wireless line is defective, the wireless devices 1 and 2 are requested to acquire the line state (step S1).
09). Then receive the response from the wireless device 1, 2,
This is read (step S10). Then, such processing continues until the line quality becomes good (step S1).
11). When the line quality is good, the process returns to step S100 of issuing the calling command in FIG.

On the other hand, in FIG. 11, step S105.
If the transmission from the wireless devices 1 and 2 is incomplete,
The reason is determined (step S112: FIG. 12).
The reason why the call is not completed is that a predetermined waiting time 1 (step S113) is set for each of busy, wired line congestion, and wireless line congestion.
Waiting time 2 (step S114) and waiting time 3 (step S115) are set.

When the predetermined waiting time set for each case has passed (step S116), the process shown in FIG.
Then, the transmission command is transmitted again (step S10).
0), the above processing is performed.

The reason why the call is not completed may be that the other party does not respond. In this case, the predetermined number is counted, and if the count is exceeded (step S117), it is determined that the connection has failed, the computer 10 or 20 is notified of that, and the process ends (step S118).

Count-over (step S117)
Then, the connection is unsuccessful, the computer 10 or 20 is notified of that fact, and the process is terminated (step S118). S108: Other) is similarly performed.

Returning to step S107 of FIG. 12, if the connection is completed, the communication processing of FIG. 13 is continued. That is, data communication between the computers 10 and 20 is performed (step S119). Then, the content of the data is monitored (step S120), and if the line is normal, the data communication between the computers is continued.

When the line is disconnected (step S121: y
es), it is determined whether or not forced disconnection (step S12).
2). Whether the forced disconnection has occurred can be determined, for example, based on whether the disconnection reason notified by the wireless device is normal termination. If it is not forcible disconnection, session termination processing is performed as normal termination of data communication (step S125), and the computer 10, 20 corresponding to the line disconnection notification is executed.
Is notified (step S126), and the process ends.

On the other hand, in the case of forced disconnection (step S
122: yes), it is determined whether or not the session is continuing (step S123). Whether or not the session is continuing can be determined, for example, by monitoring the content of the communication data from the computer and whether or not there is a command or response indicating the end of the session. If the session is not ongoing,
The line disconnection is notified to the corresponding computers 10 and 20 as it is, and the data communication process ends (step S126).

On the other hand, if the session is ongoing,
The reason for the disconnection is determined (step S124), and if it is due to disconnection from the other party, the session is terminated (step S125), the line disconnection is notified to the corresponding computers 10 and 20, and the process is terminated.

On the other hand, in the case of wire disconnection, step 100
Returning to (FIG. 11), the transmission command to the wireless devices 1 and 2 is transmitted. If the wireless line is disconnected, step 10
The corresponding wireless devices 1 and 2 are requested to acquire the line status of No. 9.

FIGS. 14 to 16 show an example of handling processing when the quality of the wireless channel is poor. That is, when the agent 21 shown in FIG. 5 is configured to include firmware, the agent storage unit 215 is further provided as shown in FIG. FIG. 14 shows an operation sequence of a response process performed when the quality of the wireless line is poor using the agent 21.
Is shown in Further, FIG. 15 shows the processing function of the agent for FIG.

First, in the operation flow of FIG. 12, the agent 21 determines that when the connection is incomplete, when the line is defective,
The line status is read from the corresponding wireless devices 1 and 2 (steps S109 and 110). Therefore, it can be understood that the line quality is poor. In this case, the agent 21 makes the data SD transmitted from the first computer 10 the first data SD, for example.
The data is stored in the data storage means 215 without being sent to the wireless device 1.

Then, when the line quality is improved, the data accumulated in the data accumulating means 215 is collectively transmitted (step S10). As a result, even if the line quality is poor, the transmission efficiency is not significantly deteriorated due to retransmission and the like, so that there is an overall effect of improving the transmission efficiency and the frequency utilization efficiency. In addition, since it operates in an unspecified application, it has the effect of becoming general-purpose.

In FIG. 15, the agent 21 acquires the line quality information from the corresponding wireless device (step SS).
13). The quality of the line is judged based on the acquired line quality (step SS14). If the line quality is poor, the data is stored (step SS15). This is continued until the line quality becomes good, and the data accumulated when the line quality becomes good is transmitted (step SS1).
6).

Referring back to FIG. 34, in the conventional communication without an agent, the protocol between computers, which is generally wider than the wireless section and has a few errors, is applied to the wireless section as it is. Was.

Therefore, in the wireless section, there is a problem that the operation is stopped when the transmission efficiency is poor. FIG.
4 is the OSI on the computers 10 and 20 and the wireless devices 1 and 2.
The communication function corresponding to the communication layer model is shown.
LAPDM (Link Access Pr) in the wireless section
otocol for Digital Network
The error that cannot be relieved by the link layer protocol called k) is TCP, which is a protocol between the computers 10 and 20.
(Transport Control Protocol
ol) before being retransmitted for the first time.

Retransmission by TCP has a long timer time and a long frame length, and as a result, the transmission efficiency becomes very poor. This is a general TCP / IP (Internet Protocol) as a communication protocol between computers.
1), PPP (Point to point) of the data link layer
This is because both the Point Protocol) and the IP of the network layer perform only error detection and have no function of relieving errors such as error correction and retransmission.

FIG. 17 shows a configuration for solving the above conventional problems. First computer 10 and second computer 20
Of the first wireless device 1 and the second wireless device 2, respectively, when the first agent 21
The computer 10 has a function of converting a protocol with the computer 10 into a protocol with the first wireless device 1.

Further, the second agent 21 is provided with a function of converting a protocol with the second computer 20 into a protocol with the second wireless device 2. in this way,
The protocol is symmetrically converted by the first and second agents 21.

Therefore, the first computer 10 is as if the second computer 2
It seems that the computer 20 directly communicates with the computer 20 by the protocol between computers. This seems to exist independently of the wireless section protocol.

Since the protocol between the wireless devices can be set independently of the protocol between computers as described above, there is an effect that the degree of freedom on the computer side is expanded. Further, since a protocol more suitable for the wireless section can be applied, there is an effect of improving transmission efficiency and frequency utilization efficiency.

FIG. 18 shows an example of the configuration of an agent that performs such a function. Computing means 210 as computing means
Has a protocol conversion function. In the direction from the information receiving unit 211 connected to the computers 10 and 20 toward the wireless devices 1 and 2, the computing unit 210 converts the protocol 1 between computers to the protocol 2 between wireless devices.

On the contrary, in the direction from the information receiving means 214 connected to the wireless devices 1 and 2 toward the computers 10 and 20, the computing means 210 converts the protocol 2 between wireless devices to the protocol 1 between computers.

FIG. 19 shows the communication of one embodiment of the present invention corresponding to the communication function diagram corresponding to the OSI communication layer model on the conventional computers 10 and 20 and the wireless devices 1 and 2 shown in FIG. It is a functional diagram. In FIG. 33, the LA of the wireless section
The error that cannot be relieved by the link layer protocol called PDM is TCP which is a protocol between the computers 10 and 20.
The configuration is such that it is propagated up to and is retransmitted for the first time.

On the other hand, in the configuration shown in FIG. 19, the agent 21 is provided, where TC, which is a protocol between computers, is used.
The P / IP is terminated, converted into non-procedure, and transmitted to the wireless device. Therefore, redundant data such as a TCP / IP header is not included in the wireless section, and only LAPDM is applied, which reduces the probability of retransmission due to an error. In addition, even if an error that cannot be relieved by LAPDM occurs, that part is transmitted to the other computer as it is,
Since TCP retransmission does not occur, transmission efficiency does not decrease. Of course, if you apply error correction instead of non-procedure,
It is also possible to correct an error that cannot be repaired by LAPDM.

FIG. 20 corresponds to FIG. 19 and is an operation flow in the case of monitoring the IP datagram at the start of communication sent from the device in which the agent is mounted. First, the IP (Internet Protocol) datagram (TCP
(Including the frame) is read (step SS20).

At this time, the data is serially read and the IP header is cut out (step SS21).
Next, the destination IP address is read (step SS
22). Further, the TCP header of the TCP segment format as shown in FIG. 21 is cut out (step S
23).

The destination port number is read from the cut out TCP header (step SS24), the processing target of the destination port number is determined, and the application is identified (step SS25).

Depending on the port number, ftp (file transfer:
Step SS26), telnet (remote terminal: step SS27), SMTP (mail: step SS2)
8) A specific port number is assigned to an application such as NNTP (news).

Therefore, the corresponding processing is performed based on the port number (steps SS26, 27, 2 in FIG. 20).
8). Corresponding to these processes, a setting command is sent to the wireless devices 1 and 2 (step SS29).

FIG. 22 shows, as an example of application of the present invention, the agent 21 as a main body, monitoring communication data, identifying communication applications on the computers 10 and 20, and correspondingly communicating between the wireless devices 1 and 2. It is a figure explaining operation which determines a protocol.

The first and second agents 21 monitor the communication data of the corresponding computers 10 and 20 (step S200). Then, the communication application on the computers 10 and 20 is identified (step S20).
1).

Next, communication is performed between the agents 21 (step S202), the protocol between the wireless devices is determined (step S203), and data communication is started (step S204).

In this application example, since the protocol suitable for the communication application to be used is selected and adopted,
This has the effect of improving transmission efficiency and communication quality (response speed, etc.).

Here, as an example of selection and adoption of a protocol, in ftp, a protocol based on HDLC (LAPDM) is used.
, Select no procedure for telnet, and select BSC procedure for mail.

FIG. 23 shows another application example, in which the packet size between wireless devices according to the communication application on the computer is determined in the same procedure as in FIG.
That is, in the conventional communication that does not go through an agent, a fixed packet size is generally used between wireless devices.
Depending on the communication application used, there have been problems such as poor transmission efficiency and poor communication quality (response speed, etc.).

Communication is performed between the agents 21 (step S202), and the packet size between wireless devices is determined (step S213). For example, a long size (256 bytes) is selected for ftp, and a standard size (128 bytes) is selected for telnet and mail.

FIG. 24 shows an application example of another agent 21 in addition to FIGS. 22 and 23. In the same procedure as FIG. 22, an error control method between wireless devices is determined according to a communication application on a computer. This is an example. When the first computer 10 and the second computer 20 communicate using the first wireless device 1 and the second wireless device 2, respectively, that is, the communication is performed between the agents 21 (step S20).
2) Determine an error control method between wireless devices (step S223).

For example, in ftp, strong error correction [BCH
(7, 4)] and retransmission control are selected. See also telnet
Then, only standard error correction [BCH (15,11)] is selected, and only strong error correction [BCH (7,4)] is selected for mail.

FIG. 25 shows another agent 21.
22 is an application example of the above, and is an example of determining the band to be used between the wireless devices according to the communication application on the computer in the same procedure as in FIG. When the first computer 10 and the second computer 20 communicate using the first wireless device 1 and the second wireless device 2, respectively, the agents 21 communicate with each other (step S202), and the wireless device The used band between them is determined (step S233).

For example, 3 of a digital mobile phone (PDC)
In the example using slot TDMA, 3 for ftp
Select simultaneous slot allocation. In telnet, standard (1 slot) allocation is selected. Select standard (1 slot) allocation for mail.

FIG. 26 is a processing flow for monitoring the IP datagram at the start of communication, as opposed to the processing of FIG. 20 for monitoring the IP datagram during communication. It is constantly determined whether or not the destination IP address has changed (step SS30).

When a change in the destination IP address is detected,
A change in the port number is detected, and the processes for ftp, telnet and mail (steps SS26, 27 and 28) described in FIG. 20 are performed corresponding to the changed port number. If the port number has not changed, the process returns to step SS20.

FIG. 27 is an application example of the agent 21 prepared according to the present invention. The first or second agent 21 allows the wireless devices 1 and 2 to communicate with each other according to the line quality. The protocol is changed during communication.

That is, in FIG. 27, the line information is received from the corresponding wireless device during the data communication of the first and second wireless devices 1 and 2, and based on this, the agent 21 monitors the quality of the wireless line ( Step S205). It is determined whether or not the line quality has changed (step S206), communication is performed between the agents (step S202), and the communication protocol between the wireless devices 1 and 2 is determined (step S20).
3). This makes it possible to change the protocol between the wireless devices during communication according to the line quality of the wireless section.

Similarly, FIG. 28, FIG. 29, and FIG.
Monitors the quality of the wireless line and determines the packet size between the wireless devices based on the line quality (step S
213), the error control method is determined (step S22).
3) is an application example in which the used band is determined (step S233). In any case, it is possible to adaptively convert the packet size, the error control method, and the used band during communication.

FIG. 31 shows an application example in which when one agent does not know the protocol to be used, the other agent sends the protocol used to the agent.

The protocol is instructed from the first agent 21 to the other second agent 21 (step S300). The second agent 21 determines whether or not the instructed protocol is known (step S301), and if it is known, the second agent 2
The protocol acknowledgment from 1 is returned to the first agent 21 (step S302).

On the other hand, if the protocol is not known, the second
The agent 21 requests the transmission of the protocol from the first agent (step S303). In response to this, the protocol is transmitted from the first agent 21 (step S304). In this way, the protocol can be transmitted to the agent who does not know the protocol to be used.

[0121]

As described above according to the embodiment,
The present invention eliminates uncertainty peculiar to wireless communication by arranging agents at both ends of a wireless section when performing data communication between computers via a wireless line, and performs matching between the computer environment and the wireless communication environment. A wireless data communication system can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a third embodiment of the present invention.

FIG. 4 is a diagram explaining a common operation concept in the embodiments of FIGS. 1 to 3;

5 is a diagram showing a configuration example of an agent 21. FIG.

FIG. 6 is a diagram of configuring an agent as firmware.

FIG. 7 is a sequence flow showing one operation sequence in the embodiment of FIGS.

8 is an operation flow of the agent corresponding to FIG.

FIG. 9 is a diagram illustrating an operation sequence for disconnection of a line during data communication.

10 is an operation flow of the agent corresponding to the operation sequence of FIG.

FIG. 11 is a flowchart (No. 1) showing the processing steps of the agent.

FIG. 12 is a flowchart (No. 2) showing the processing steps of the agent.

FIG. 13 is a flowchart (No. 3) showing the processing steps of the agent.

FIG. 14 is a diagram illustrating an example of handling processing when the quality of a wireless line is poor by using a data storage unit.

FIG. 15 is a processing flow of the agent for FIG.

16 is a configuration example of an agent 21 for FIG.

FIG. 17 is an explanatory diagram of a method of the present invention for improving the problem of the conventional error correction function such as error correction and retransmission.

FIG. 18 is a diagram showing a configuration example of an agent for FIG.

FIG. 19 is a communication function diagram of an embodiment of the present invention with respect to the communication function corresponding to the conventional OSI communication layer model.

FIG. 20 is an operation flow in the case of monitoring an IP datagram at the start of communication, which is transmitted from a device in which an agent is mounted.

FIG. 21 is an example of a TCP segment format.

FIG. 22 is a diagram illustrating an operation of determining a protocol between wireless devices 1 and 2 by an agent.

FIG. 23 is a diagram illustrating an operation of determining a packet size between wireless devices 1 and 2 by an agent.

FIG. 24 is a diagram illustrating an operation of determining an error control method between wireless devices 1 and 2 by an agent.

FIG. 25 is a diagram for explaining the operation of the agent to determine the used band between the wireless devices 1 and 2.

FIG. 26 is a process flow in which an IP datagram during communication is further monitored in contrast to the process of FIG. 20 for monitoring an IP datagram at the time of starting communication.

FIG. 27 is a diagram for explaining an operation of changing a protocol between wireless devices during communication by an agent according to line quality.

FIG. 28 is a diagram illustrating an operation of changing the packet size between wireless devices during communication by an agent according to the line quality.

FIG. 29 is a diagram illustrating an operation of changing an error control method between wireless devices during communication by an agent according to line quality.

[Fig. 30] Fig. 30 is a diagram for describing the operation of changing the used band between wireless devices during communication by the agent according to the line quality.

FIG. 31 is a diagram illustrating transmission of a protocol by an agent when the protocol to be used is unknown.

FIG. 32 is a diagram illustrating a first conventional example.

FIG. 33 is a diagram illustrating a second conventional example.

FIG. 34 is a diagram illustrating a third conventional example.

[Explanation of symbols]

 1 and 2 Wireless device 10 and 20 Computer 21 Agent 11 Data adapter 210 Arithmetic means 211 and 214 Information receiving means 212 and 213 Information transmitting means

Claims (18)

[Claims] 1. A first operatively connected to a first wireless device.
Second computer operatively connected to the second wireless device
In a wireless data communication system in which data is communicated to another computer via a wireless line, between the first computer and the first wireless device, and between the second computer and the second wireless device, respectively. A first and a second that have a wireless device-to-computer interface for a computer, have a computer-to-wireless device interface function for a wireless device, and can operate autonomously according to a given situation. Wireless data communication system that is configured by arranging the agents. 2. The first or second agent according to claim 1, wherein the first or second agent is connected to the first or second agent.
Alternatively, a signal or parameter indicating a request for communication is received from the second computer, a signal or parameter indicating a communication state is received from the connected wireless device, and a request for communication is received based on these received signals or parameters. And a wireless data communication system configured to perform an operation for optimizing a communication state. 3. The method according to claim 2, wherein the first or second agent further transmits a signal or parameter for setting a communication mode to the connected wireless device, and communicates with the connected computer. A wireless data communication system configured to transmit a signal or a parameter for setting a control method of the wireless data communication system. 4. The wireless data communication system according to claim 3, wherein the first or second agent is configured to communicate with each other in order to match the settings of the communication to be used. 5. The first computer according to claim 1, wherein the first computer operates from the first wireless device to the second wireless device.
Connection failure when the wireless device of
The wireless data communication system, wherein the agent controls to cause the first wireless device to re-transmit without notifying the first computer that the connection has failed. 6. The line according to claim 1, wherein the line is forcibly disconnected when the first computer and the second computer are communicating via the first wireless device and the second wireless device, respectively. Wireless communication system, the first or second agent causes the connected wireless device to re-transmit without reporting the disconnection to the connected computer. 7. The line quality according to claim 1, when the data is transmitted from the first computer to the second computer via the first wireless device and the second wireless device, respectively, the line quality is poor. In this case, the first agent accumulates data from the first computer, and when the line quality is good, the accumulated data is collectively transmitted from the first wireless device. Communications system. 8. The first computer according to claim 1, wherein the first computer and the second computer communicate with each other using the first wireless device and the second wireless device, respectively. The agent converts a first protocol between the first computer and the first agent into a second protocol between the first agent and the first wireless device, and the second agent A wireless data communication system, wherein a third protocol between the second computer and the second agent is converted into a fourth protocol between the second agent and the second wireless device. 9. The wireless data communication system according to claim 8, wherein the first protocol and the third protocol are the same, and the second protocol and the fourth protocol are the same. .. 10. The communication data transmitted from the first computer and the second computer to the first wireless device and the second wireless device, respectively, according to claim 1, wherein: Two agents monitor and identify the communication application on the first and second computers, and depending on the identified communication application,
A wireless data communication system for determining a protocol between the first and second wireless devices. 11. The communication data transmitted from the first computer and the second computer to the first wireless device and the second wireless device, respectively, according to claim 1, Two agents monitor and identify the communication application on the first and second computers, and depending on the identified communication application,
A wireless data communication system characterized by determining a packet size between the first and second wireless devices. 12. The communication data transmitted from the first computer and the second computer to the first wireless device and the second wireless device, respectively, according to claim 1, wherein: Two agents monitor and identify the communication application on the first and second computers, and depending on the identified communication application,
A wireless data communication system for determining an error control method between the first and second wireless devices. 13. The communication data transmitted from the first computer and the second computer to the first wireless device and the second wireless device, respectively, according to claim 1, wherein: Two agents monitor and identify the communication application on the first and second computers, and depending on the identified communication application,
A wireless data communication system, characterized in that a band used between the first and second wireless devices is determined. 14. The wireless data communication according to claim 10, wherein the first or second agent changes a protocol between the wireless devices during communication according to a line quality between the wireless devices. system. 15. The wireless data communication according to claim 11, wherein the first or second agent changes the packet size between the wireless devices during communication according to the line quality between the wireless devices. system. 16. The wireless data according to claim 12, wherein the first or second agent changes an error control method between the wireless devices during communication according to a line quality between the wireless devices. Communications system. 17. The wireless data communication according to claim 13, wherein the first or second agent changes a band used between the wireless devices during communication according to a line quality between the wireless devices. system. 18. The wireless data according to claim 1, wherein when one agent does not know the protocol to be used, the other agent transmits the protocol to be used by the one agent. Communications system.