JPH08279890A - Data communication equipment - Google Patents

Abstract

PURPOSE: To attain stable communication by preventing missing data, re- transmission and interruption of communication from being frequently caused during radio data communication. CONSTITUTION: A controller 1 controls data communication via a wired or a radio communication network. A communication network control means 2 connects to the wired or the radio communication network to control input output of image data or the like. A communication form discrimination means 3 discriminates whether the executed communication is radio communication or not based on a dial number entered from an entry means 5 or a code denoting its own equipment or opposite equipment is a radio communication equipment. As a result, when the communication is the radio communication, a parameter revision means 4 revises various parameters so as to be optimum for the utilization of the radio communication network. Through the constitution above, a reply with respect to an instruction is surely obtained and a completion rate of communication is enhanced more than that of radio data communication by a conventional equipment and stable radio data communication is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device,
Particularly, the present invention relates to a data communication device capable of preventing frequent occurrence of data loss, retransmission, communication interruption, redial, etc. in wireless data communication by changing various parameters used in the data communication protocol and the like. .

[0002]

2. Description of the Related Art Conventionally, in wireless communication such as mobile phones, car phones and in-car phones such as trains, a channel switching request generated from a base station when a communication person moves from a current communication zone to another communication zone. Communication is often interrupted temporarily. In addition, the reception level of communication signals changes rapidly (attenuation) in places where the radio waves do not reach or are difficult to reach, such as in the shadows of tunnels and buildings.
However, communication was sometimes interrupted. In the case like above,
In a voice call, even if there was some interruption during communication, the user was able to fully judge the content of communication, so it was not significantly affected. The communication interruption time due to the channel switching request is usually about 0.7 to 0.8 seconds in the case of the analog method. However, in recent years
The wireless communication has spread to various fields, and data communication such as facsimile communication (hereinafter referred to as wireless data communication)
Is becoming more popular. For this reason, there has been a problem that data loss, communication error, and interruption frequently occur, data retransmission, redial, and the like are repeatedly performed, and appropriate wireless data communication cannot be performed.

In order to solve this problem, Japanese Patent Laid-Open No. 2-1
Japanese Patent No. 14759 (hereinafter, referred to as known document 1) discloses that when image information is received line by line in wireless data communication,
The reception level is read to detect the presence or absence of a transmission error of the image information, and the information based on the reception level is recorded at the line end of the image information having the transmission error to notify the operator, and the operator can be notified appropriately. Techniques for allowing treatment are disclosed. In addition, Japanese Examined Japanese Patent Publication 60-57262
Japanese Patent Laid-Open Publication No. Hei 2-2
In Japanese Patent No. 7866 (hereinafter referred to as known document 3), when facsimile communication is started, a request for prohibiting the channel switching is sent to the line control station (base station), and the channel switching is not performed during the communication. Such a technique is disclosed.

[0004]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention In the above-mentioned publicly known documents 1 to 3, the interruption of communication in a place where radio waves cannot reach or are hard to reach such as in the shadow of a tunnel or a building is not considered, and the above-mentioned problems have been sufficiently described. I cannot solve the problem. Particularly, in the above-mentioned known document 1, the operator can only know the reception level of the information having the transmission error, and does not consider the problem that the wireless data communication is interrupted due to the attenuation of the reception level of the information. . Further, in the above-mentioned publicly known documents 2 and 3, channel switching is prohibited during a call, and if the user leaves the communication zone in which he / she is currently located, the reception level of the signal reaching the receiver side is attenuated and communication is interrupted. The problem has not been resolved. Also,
Communication using a wireless communication network has a peculiar problem that data propagation is delayed. However, the above-mentioned publicly known documents 1 to 3 do not consider the above-mentioned problems at all and have not solved them. An object of the present invention is to eliminate the above-mentioned problems of the prior art, prevent data loss or retransmission, communication interruption or redial, etc. from occurring frequently during wireless data communication, and perform stable data communication. It is to provide a data communication device capable of performing.

[0005]

In order to achieve the above object, the invention of claim 1 is a control device for controlling data communication performed via a wired communication network or a wireless communication network, and a wired communication network or A communication network control unit connected to a network such as a wireless communication network for controlling input / output of image data and a protocol, and a communication mode for determining whether or not communication executed via the communication network control unit is wireless communication It comprises a judging means, a parameter changing means for changing various parameters used during communication, and an input means for inputting a dial number of the partner device or a code indicating that the partner device or the partner device is a wireless communication device. The point is characteristic.

According to the second aspect of the present invention, when it is determined that the communication mode is wireless communication, the parameter changing means sets the values of various timers related to the protocol used during communication to normal values (in the case of wired communication). It is characterized in that it is changed so that it becomes a larger value. Claim 3
In the invention, when it is determined that the communication mode is wireless communication, the parameter changing unit changes the number of times of resending the command at the time of data communication to be larger than the normal number (the number of times at the time of wired communication). There is a feature in that. Also,
The invention of claim 4 is characterized in that, when it is determined that the communication mode is wireless communication, the parameter changing means changes so as to loosen the criterion for determining the transmission quality during data communication.

The invention of claim 5 is characterized in that it is provided with a holding means for holding a code indicating that it is a wireless communication device. Further, the invention of claim 6 is characterized in that the code indicating that the partner device input from the input means is a wireless communication device is added to the dial number. Further, the invention of claim 7 is characterized in that a code input from the input means to indicate that the device is a wireless communication device is added to the protocol.

[0008]

According to the invention of claim 1, the communication form judging means judges whether or not the communication executed through the communication network control means is wireless communication. As a result, when the communication is wireless communication, the parameter changing means changes the various parameters so as to be optimal for use of the wireless communication network. Therefore, the probability of successful communication increases,
It is possible to increase the success rate of communication as compared with the wireless data communication by the conventional device.

According to the second aspect of the present invention, the parameter changing means changes the values of various timers related to the protocol so as to be larger than the normal values. Therefore, the waiting time for the response to a certain command (timer value)
Can be taken longer. Further, according to the invention of claim 3, the parameter changing means changes the number of times of retransmitting a command at the time of data communication so as to be larger than the normal number of times. This increases the chances of receiving a resend command,
It becomes possible to improve the success rate of communication. Also,
According to the invention of claim 4, the parameter changing means includes:
Change to loosen the criteria for determining the transmission quality during data communication. Therefore, the number of times data is retransmitted due to a communication error can be reduced, and frequent data retransmission can be suppressed.

Further, according to the invention of claim 5, the holding means holds a code indicating that the own device inputted from the input means is a wireless communication device, and the communication form judging means is a holding means. I am trying to read the contents. For this reason,
It becomes possible to judge that the own device is a wireless communication device and declare this to the other device. Further, according to the invention of claim 6 or 7, the code input from the input means and indicating that the own device or the other device is a wireless communication device is added to the dial number or the protocol. For this reason,
The communication form determination means determines whether or not the own device or the other device is a wireless communication device, and notifies the other device that the own device is the wireless communication device, or conversely, the other device is the wireless communication device. It becomes possible to judge whether or not.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 2 is a block diagram showing a specific example of the configuration of a data communication device, for example, a facsimile device, and FIG. 3 is a partial block diagram showing a modified example for using the facsimile device in a wireless communication network. Note that FIG. 3 corresponds to the configuration within the broken line shown in FIG. In the figure, 11 is a CPU for controlling the operation of the entire apparatus, 12 is a ROM in which a control program is stored, 13 is various information related to control of the CPU 11, for example, a counter, a flag and data are temporarily or permanently stored. RAM, 14 is a clock device for indicating the current time and measuring time, 15 is a keyboard for inputting identification signals, communication numbers and the like, and 16 is a display for displaying the status of the device, operating procedures, etc. . 1
Reference numeral 7a is a network control device that is connected to a wired communication network (network) and inputs and outputs image data and the like. Reference numeral 17b denotes a wireless device (see FIG. 3) that inputs and outputs image data via a wireless communication network, and is a device that replaces the network control device 17a. 18 is the network control device 17a or the wireless device 17b
A modulator / demodulator that modulates image data output via the input / output device, or a demodulator that demodulates input image data, 19 is a RAM that is modulated by the modulator / demodulator 18 or that stores demodulated image data, and 20 is an image An encoding / decoding device for encoding and decoding data, 21 is a scanner 2
2 is a RAM for storing the image read in 2 and the image data recorded by the printer 23. The wired communication network is, for example, a telephone line, an ISDN network, a LAN, or the like, and the wireless communication network is, for example, a mobile phone, a car phone, an in-car phone such as a train, or the like.

Next, a first embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a parameter table that defines timer values used in the facsimile communication protocol. In the figure, the timer values T1 to T5 are ITU-T recommendation T.264 of the G3 protocol. It is a value based on 30,
Each shows the expected time to return a response to a certain command. This parameter table is stored in the RAM 13. The timer value T1 is a time value for two stations (transmitting station and receiving station) to identify each other, the timer value T2 is a time value for detecting a loss of command / response synchronization, and the timer value T3 is a station. Is a time value while trying to alert the operator in response to a predetermined interruption of the procedure, and a timer value T5 is a waiting time value for releasing the busy state of the receiving station. The timer value T4 is provided for optional processing. In addition, the recommendation T. At 30,
The timer value T1 is 35 ± 5 seconds, and the timer value T2 is 6 ± 1.
Seconds, timer value T3 is 10 ± 5 seconds, timer value T4 is 3.0
± 0.45 seconds and the timer value T5 are specified as 60 ± 5 seconds (specified value). When using the wired communication network, the timer values T1 to T5 are set to the median of the specified values. On the other hand, the maximum value of the specified values is used for the wireless communication network used by the present invention.

Next, the operation of this embodiment will be described. Figure 5
6 is a flowchart showing the operation of the present apparatus using the parameter table shown in FIG. This operation is performed by, for example, the recommendation T. This is performed at the time of command response control of facsimile communication by 30. First, in step S1, the C
The PU 11 determines whether or not wireless communication is used. When this determination is affirmative, the process proceeds to step S2, and the timer value for the wireless communication network shown in FIG. 4 is read from the RAM 13. On the other hand, if the determination is negative, the process proceeds to step S3, and the timer value for the wired communication network is read from the RAM 13. In step S4, the timepiece device 14 is activated, and the process according to the timer value read from the RAM 13 is performed. Then, the process proceeds to the next predetermined process, that is, the protocol communication process. As described above, in the present embodiment, the waiting time (timer value) for the response to the command is set longer when the wireless communication network is used than when the wired communication network is used. Therefore, it is possible to suppress the influence of the data propagation delay, which is a problem peculiar to using the wireless communication network, to a low level.
The probability of successful communication increases, and as a result, normal wireless data communication can be performed.

Next, a second embodiment will be described with reference to the drawings. FIG. 6 is a parameter table that defines the number of times of retransmission of a command used in the facsimile communication protocol. In the figure, for example, when the wired communication network is used, the command is transmitted three times, and when the wireless communication network is used, the command is transmitted five times. Next, the operation of this embodiment will be described. FIG. 7 is a flowchart showing the operation of this device using the parameter table shown in FIG. This operation is performed during command transmission / reception during facsimile communication, for example. First, in step S11, the CPU 1
At 1, it is determined whether or not the communication is wireless communication. If this determination is affirmative, the process proceeds to step S12, and the number of times of retransmission of the command for the wireless communication network shown in FIG. 6 is read from the RAM 13. On the other hand, if the determination is negative, step S
13, the number of times the command for the wired communication network is retransmitted is RA
It is read from M13. Then, the process proceeds to a predetermined process according to the command.

As described above, in the present embodiment, the channel switching that occurs during the communication peculiar to the wireless communication network, and the reception level of the communication signal at the place where the radio waves cannot reach or are hard to reach such as the shadow of the tunnel or the building. Even if there is an unsuccessful reception of the command due to a rapid change, the number of times the command is retransmitted is increased, so that the channel switching is terminated while the retransmission of the unsuccessful command is repeated, There are many cases where people get out of places such as tunnels and the shade of buildings. For this reason, the probability of success in exchanging a predetermined command increases, and as a result, normal wireless data communication can be performed.

Next, a third embodiment will be described with reference to the drawings. FIG. 8 shows the criterion for determining the transmission quality of image data by facsimile communication according to the recommendation T. It is a parameter table defined based on 30. In the figure, message confirmation commands MCF, RTP,
The threshold for determining whether to send the RTN is the same as that described in Recommendation T. The transmission error occurrence rates according to 30 are 0 to 3%, 3 to 5%, and 5 to 100%, while the threshold values when using the wireless communication network are 0 to 5%, 5 to 10%, and 10 respectively. -100%. Here, the RTP (acknowledge retraining) is a command that means that the modem has to be retrained when the message has been completely received, but there is a next page. denial)
Is a command that means that if the message cannot be completely received and there is a next page, the modem needs to be retrained.

Next, the operation of this embodiment will be described. Figure 9
FIG. 9 is a flowchart showing the operation of the present apparatus using the parameter table shown in FIG. This operation is performed on the receiver side when transmitting image data during facsimile communication, for example. First, in step S21, the transmission error occurrence rate (X) of the received image data is read from the RAM 13. In step S22, the CPU 11 determines whether or not the wireless communication is performed. If this decision is positive,
In step S23, the transmission error occurrence rate (Y) of the message confirmation command MCF for the wireless communication network shown in FIG. 8 is read from the RAM 13. On the other hand, if the determination is negative, the process proceeds to step S24, and the transmission error occurrence rate (Y) of the message confirmation command MCF for the wired communication network is read from the RAM 13. Step S25
Then, it is determined whether or not the value of the transmission error occurrence rate (X) of the received image data is smaller than the value of the transmission error occurrence rate (Y) of the message confirmation command MCF. If this determination is affirmative, the process proceeds to step S26, and the CPU 11 creates the MCF signal. In the following step S33, the MCF signal is transmitted to the partner machine, and the process proceeds to the next process. On the other hand, if the determination in step S25 is negative, the process proceeds to step S27.

In step S27, the CPU 11 is restarted.
Then, it is determined whether or not the communication is wireless communication. If this determination is affirmative, the process proceeds to step S28, and the transmission error occurrence rate (Z) of the message confirmation command RTP for the wireless communication network shown in FIG. 8 is read from the RAM 13. on the other hand,
If the determination is negative, the process proceeds to step S29, and the transmission error occurrence rate (Z) of the message confirmation command RTP for the wired communication network is read from the RAM 13. Step S
At 30, it is determined whether or not the value of the transmission error occurrence rate (X) of the received image data is smaller than the value of the transmission error occurrence rate (Z) of the message confirmation command RTP.
If this determination is positive, the process proceeds to step S32, and the CP
U11 creates an RTP signal. On the other hand, if this determination is negative, the process proceeds to step S31 and the RTN signal is created. Then, in step S33, the RTP signal or the RTN signal is sent to the partner device. As described above, in the present embodiment, the threshold for determining whether to send each message confirmation command MCF, RTP, or RTN when using the wireless communication network is set to be about 2 to 5% less than when using the wired communication network. For this reason,
Although the data transmission error occurrence rate is somewhat higher, frequent data retransmission can be suppressed. As a result,
The occupation time of the communication line and the communication cost can be reduced, and the image data communication can be efficiently performed by using the wireless communication network. The threshold value is set to 2
Although the quality of the received image is deteriorated by reducing the amount by about 5%, the received image does not become unreadable due to this deterioration.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. The present embodiment is an invention of means for determining whether or not the partner device is a wireless communication device.
It is used for the determination in steps S1, S11, S22 and S27 of the third embodiment. In this embodiment, an input key indicating that the partner device is a wireless communication device, for example, a "wireless communication device" key is used as a means for determining whether or not the partner device is a wireless communication device. This key is provided on the keyboard 15 shown in FIG. The "wireless communication device" key is input by the operator when the dial number of the partner device is input.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG. First, in step S41, the operator inputs the "wireless communication device" key when inputting the dial number of the partner device.
In step S42, the CPU 11 determines whether or not the wireless communication is performed. When this determination is affirmative, the process proceeds to step S43, and the wireless communication flag in the RAM 13 is turned on. On the other hand, if the determination is negative, the process proceeds to step S44 to turn off the wireless communication flag. As described above, it is possible to determine whether or not the partner device is the wireless communication device, based on the “on” and “off” of the wireless communication flag in the RAM 13.

As a modification of the fourth embodiment, a number indicating that the partner is a wireless communication device is stored in the RAM 13 together with the dial number of the partner by a general method of registering a speed dial number. The operation as shown in FIG. 11 may be performed. First,
In step S51, the speed dial number of the partner machine is input from the keyboard 15. In step S52, the CPU 11 determines whether the wireless communication is performed. If this determination is affirmative, that is, if the number indicating that the partner device is the wireless communication device is included in correspondence with the speed dial number, the process proceeds to step S53 and the R
The wireless communication flag in the AM 13 is turned on. on the other hand,
If the determination is negative, that is, if the number is not included, the process proceeds to step S54, and the wireless communication flag is turned off. As described above, the wireless communication flag in the RAM 13 is turned "on" or "off" depending on whether or not the speed dial number includes a number indicating that the partner device is a wireless communication device. It is possible to determine whether the device is a wireless communication device.

Next, a fifth embodiment of the present invention will be described with reference to the drawings. The present embodiment is an invention of means for determining whether or not the partner device is a wireless communication device, and the partner device is wirelessly communicated by a prefix composed of three digits provided at the head of the dial number of the partner device. It is determined whether the machine is a machine. The prefix is, for example, 030
And 040, 030 indicates that the distance between the own device and the partner device is within 160 kilometers, and 040 indicates that the distance between the own device and the partner device is 160 kilometers or more. The relay base station of the wireless communication network uses the prefix to search for the partner device.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG. First, in step S61, the dial number of the partner machine is input from the keyboard 15. The dial number of this partner device includes only the dial number of the partner device, its speed dial number, the prefix and the dial number of the partner device,
Alternatively, it may be the speed dial number of the partner machine that includes the prefix. In step S62, the CPU 11 determines whether or not there is a prefix indicating wireless communication at the head of the dial number of the partner machine input in step S61. If this determination is affirmative, that is, if the prefix is present, the process proceeds to step S63 and the RAM
The wireless communication flag in 13 is turned on. On the other hand, when the determination is negative, that is, when there is no prefix, the process proceeds to step S64, and the wireless communication flag is set to "off". As described above, the wireless communication flag in the RAM 13 is turned "on" or "off" depending on whether or not there is a prefix indicating wireless communication at the head of the speed dial number, and whether the partner device is a wireless communication device. You can judge.

Next, a sixth embodiment of the present invention will be described with reference to the drawings. In the present embodiment, after being connected to the partner device, the recommendation T. 30-compliant protocol or DT
MF (Dual Tone Multiple Fre
It is to judge whether or not the partner device is a wireless communication device by exchanging a signal with the partner device according to the (qency) or the like. In this embodiment, NSF (non-standard function), NSS
(Non-standard function setting) and NSC (non-standard function command) in non-standard function signals, CSI (callee identification),
TSI (transmitting terminal identification) and CIG (calling terminal identification)
In a general signal such as, a wireless communication flag indicating whether or not it is a wireless communication device is provided, and the wireless communication flag is "ON".
When it is, it is determined that the partner device is a wireless communication device. continue,
With reference to FIG. 13, the operation of the present embodiment will be described with reference to the recommendation T. Three
The case of using a protocol conforming to 0 will be described. When the own device (transmitter) and the other device (receiver) are connected, first, NSF, DIS (digital identification signal) and CSI are transmitted from the other device to the own device. On the other hand, when the wireless communication flag in the NSF is "ON" from the own device to the other device, it is determined that the other device is the wireless communication device. On the other hand, when the own device is a wireless communication device, NSS and TSI with the wireless communication flag set to “ON” are transmitted to the other device to notify that the own device is the wireless communication device. The following description is based on the recommendation T. The data transmission (TCF, CFR) is performed in conformity with the protocol of No. 30, and the description is omitted because it is not the peculiar data transmission of this embodiment. As described above, the own device can recognize (determine) that the partner device is connected to the wireless communication network by the NSF whose wireless communication flag is “ON”. Further, when the wireless communication flag is provided in CSI, TSI and CIG, it is possible to communicate with products of other companies, and the usage range is expanded.

Next, a seventh embodiment of the present invention will be described with reference to the drawings. In the present embodiment, it is determined whether or not the device itself is a wireless communication device, and the wireless communication flags such as NSF and NSS of the protocol can be automatically turned on. The operation means indicating that the device itself is a wireless communication device can be provided on the keyboard 15 shown in FIG. 2, for example. The operation means is also input when the dial number of the partner machine is input. Then, Fig. 1
The operation of this embodiment will be described with reference to the flowchart shown in FIG. First, in step S71, the C
The PU 11 determines whether or not wireless communication is used. If this determination is affirmative, the process proceeds to step S72 and the RAM 1
The wireless communication flag in 3 is turned on. On the other hand, if the determination is negative, the process proceeds to step S73, and the wireless communication flag is set to "off". As described above, the wireless communication flag in the RAM 13 is turned "on" or "off", and it is possible to notify the partner device whether or not the device is a wireless communication device.

Next, an eighth embodiment of the present invention will be described with reference to the drawings. The present embodiment is an invention in which whether or not the device itself is a wireless communication device can be set in advance when the machine is installed, and as a setting means thereof, for example, a dip switch can be used. By setting the dip switch to “on” or “off”, it is set whether or not the own device is a wireless communication device. At the time of use, it is determined whether or not the own device is a wireless communication device depending on whether the dip switch is "on" or "off".
Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. First, step S81
Then, the state of the dip switch is read. In step S82, the CPU 11 determines from the read result of step S81 whether or not the own device is in wireless communication. If this determination is positive, the process proceeds to step S83,
The wireless communication flag in the RAM 13 is set to "ON" to declare that it is a wireless communication device. On the other hand, if the determination is negative, the process proceeds to step S84, the wireless communication flag is set to "off", and the wired communication device is declared. As described above, the wireless communication flag in the RAM 13 is set to "on" or "off" by setting the dip switch to "on" when the operator uses the wireless communication device in advance. , It is possible to declare whether or not the own device is a wireless communication device.

Next, a ninth embodiment of the present invention will be described with reference to the drawings. The present embodiment is an invention of means for determining whether or not the own device is a wireless communication device, and has a plurality of channels of a wireless communication system and a wired communication system, and includes a plurality of wireless communication networks and wired communication networks. The present invention can be applied to a facsimile machine which can be connected to any of the above communication networks and which communication network can be arbitrarily selected. This facsimile apparatus is configured to determine whether it is a wireless communication device depending on which channel it is using for communication.
For example, when the selected channel of the own device is a wired communication channel, it is determined to be a wired communication device, and when it is a wireless communication system channel, it is determined to be a wireless communication device.
If all the wired communication channels are in use, this facsimile machine communicates using the wireless communication channels. Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. First, in step S91, the CPU 11 determines whether or not a wireless channel is selected. When this determination is affirmative, the process proceeds to step S92, and the wireless communication flag in the RAM 13 is turned on. On the other hand, if the determination is negative, the process proceeds to step S93, and the wireless communication flag is set to “off”.
To As described above, the wireless communication flag is turned “on” or “off”, and it is possible to determine whether or not the own device is a wireless communication device.

Next, the functional configuration of the present invention will be described with reference to the block diagram of FIG. In the figure, reference numeral 1 is a control device for controlling a facsimile in accordance with data communication performed via a wired communication network or a wireless communication network, for example, as shown in FIG.
Corresponds to the CPU 11 shown in FIG. Reference numeral 2 denotes a communication network control unit that is connected to a network such as a wired communication network or a wireless communication network and controls the input / output of image data and the like, and corresponds to the network control device 17a or the wireless device 17b. Reference numeral 3 denotes a communication form determination means for determining whether or not the communication performed via the communication network control means 2 is wireless communication, and corresponds to the CPU 11. Reference numeral 4 denotes a parameter changing means for changing a timer value related to a protocol used during communication, the number of times of retransmitting a command, a criterion for determining the transmission quality of data transmission, and the like. Reference numeral 5 denotes an input means for inputting a dial number of the partner machine or a code indicating that the partner machine or the partner machine is a wireless communication device.
It corresponds to 5 or DIP switch.

Next, the operation of the present apparatus shown in the block diagram of FIG. 1 will be described. When data communication starts,
A code indicating that the own device or the other device is a wireless communication device is input from the input unit 5 together with the dial number of the transmission partner, and the communication form network determination unit 3 is the own device or the other device is a wireless communication device. Then, the fact is notified to the control device 1 and the parameter changing means 4. Next, the control device 1
Performs data communication based on the parameters changed by the parameter changing means 4 via the communication network control means 2. Therefore, the response to the command can be obtained with a high probability, and the success rate of communication can be increased as compared with the wireless data communication by the conventional device. As a result, communication errors are reduced as compared with the conventional device, and frequent data retransmission can be suppressed. Also, when viewed comprehensively, the communication time of facsimile communication when using the wireless communication network is shortened,
A reduction in communication cost can be achieved, and efficient image data communication can be performed using a wireless communication network.
In each of the above-described embodiments, when performing wireless data communication, data loss or retransmission, communication interruption or redial is prevented from occurring during wireless data communication. However, the present invention is not limited to this. The present invention may be applied to wired data communication even when the transmission quality is not good.

[0030]

As is apparent from the above description, according to the invention of claim 1, when the communication form judging means judges that the communication executed through the communication network controlling means is wireless communication. The parameter changing means changes various parameters so as to be optimal for use in the wireless communication network. Therefore, the response to the command can be obtained with a high probability, and the success rate of communication is higher than that of the wireless data communication by the conventional device. As a result, communication errors are reduced compared to conventional devices,
It is possible to prevent frequent data retransmission.
Also, when viewed comprehensively, the communication time of facsimile communication when using the wireless communication network is shortened, the communication cost can be reduced, and efficient and stable image data communication using the wireless communication network can be performed.

Further, according to the invention of claim 2, when the parameter changing means changes various timer values relating to the protocol to values larger than normal values, a waiting time for a response to a certain command may be set long. it can. Therefore, the influence of the data propagation delay, which is a problem peculiar to the use of the wireless communication network, can be suppressed to a low level, and the probability of successful communication is increased, and the wireless communication is efficient and stable, as in the first aspect. Image data communication using a communication network can be performed. Further, according to the invention of claim 3, the parameter changing means changes the number of times of retransmitting a command at the time of data communication so as to be larger than the normal number of times. For this reason, the receiver side has an increased chance of receiving a command, and the probability of receiving a retransmission command is improved. As a result, similar to the first and second aspects, efficient and stable image data communication using the wireless communication network can be performed. Further, according to the invention of claim 4, the parameter changing means changes so as to loosen the criterion for determining the transmission quality during data communication. For this reason, it is possible to prevent frequent data retransmission. As a result, similar to the first to third aspects, efficient and stable image data communication using the wireless communication network can be performed.

According to a fifth aspect of the present invention, the holding means holds a code input from the input means to indicate that the terminal is a wireless communication device, and the communication form determining means is a holding means. I am trying to read the contents. For this reason,
It is possible to declare to the partner device that the device itself is a wireless communication device. Further, according to the invention of claim 6 or 7, the code input from the input means and indicating that the own device or the other device is a wireless communication device is added to the dial number or the protocol. Therefore, the communication form determination means can determine whether the own device or the other device is a wireless communication device. As a result, when the own device is a wireless communication device, this can be notified to the other device, while when the other device is a wireless communication device, a countermeasure such as changing various parameters of the protocol is taken. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a main part of a data communication device of the present invention.

FIG. 2 is a block diagram showing a specific example of a configuration of a facsimile device to which the data communication device is applied.

FIG. 3 is a partial block diagram showing a modified example for using the facsimile apparatus of FIG. 2 in a wireless communication network.

FIG. 4 is a parameter table that defines timer values used in a facsimile communication protocol.

FIG. 5 is a flowchart showing the operation of the first embodiment.

FIG. 6 is a parameter table that defines the number of times a command used in a facsimile communication protocol is retransmitted.

FIG. 7 is a flowchart showing the operation of the second embodiment.

FIG. 8 shows a criterion for determining the transmission quality of image data by facsimile communication according to Recommendation T. It is a parameter table defined based on 30.

FIG. 9 is a flowchart showing the operation of the third embodiment.

FIG. 10 is a flowchart showing the operation of the fourth embodiment.

FIG. 11 is a flowchart showing an operation of a modified example of the fourth embodiment.

FIG. 12 is a flowchart showing the operation of the fifth embodiment.

FIG. 13 is a timing chart showing the operation of the sixth embodiment.

FIG. 14 is a flowchart showing the operation of the seventh embodiment.

FIG. 15 is a flowchart showing the operation of the eighth embodiment.

FIG. 16 is a flowchart showing the operation of the ninth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Control device, 2 ... Communication network control means, 3 ... Communication form determination means, 4 ... Parameter changing means, 5 ... Input means, 11 ...
CPU, 12 ... ROM, 13, 19, 21 ... RAM, 1
4 ... Clock device, 15 ... Keyboard, 16 ... Display, 17a ... Network control device, 17b ... Wireless device, 18 ... Modulation / demodulation device, 20 ... Encoding / decoding device, 22 ... Scanner, 23 ... Printer.

Claims (7)

[Claims] 1. A data communication apparatus having a function of performing data communication using at least one of a wireless communication network and a wired communication network, the control of the data communication performed via the wired communication network or the wireless communication network. A control device that performs the communication, a communication network control unit that is connected to a network such as a wired communication network or a wireless communication network, and that controls input / output of image data and a protocol, and communication performed via the communication network control unit is wireless. Enter the communication form determination means to determine whether it is communication, the parameter change means to change various parameters used during communication, the dial number of the partner device and the code indicating that the partner device or the partner device is a wireless communication device. A data communication device, comprising: 2. When it is determined that the communication mode is wireless communication, the parameter changing means changes the values of various timers related to the protocol used at the time of communication so as to be larger than the normal value. Said claim 1
The described data communication device. 3. The parameter changing means changes the number of times of retransmitting a command during data communication so as to be larger than a normal number of times when it is determined that the communication mode is wireless communication. Item 1. The data communication device according to item 1. 4. The method according to claim 1, wherein, when it is determined that the communication mode is wireless communication, the parameter changing unit changes so as to loosen the criterion for determining the transmission quality during data communication. Data communication device. 5. The data communication apparatus according to claim 1, further comprising holding means for holding a code indicating that the device itself is a wireless communication device. 6. The data according to any one of claims 1 to 4, wherein a code indicating that the partner device input from the input means is a wireless communication device is added to a dial number. Communication device. 7. The data according to any one of claims 1 to 4, wherein a code input from the input means to indicate that the device is a wireless communication device is added to the protocol. Communication device.