JPH0448857A - In-premises wireless drawing communication system - Google Patents

Abstract

PURPOSE:To attain communication freely even when a telewriting communication is installed anywhere in a premises without caring for the line installation state by sending/receiving a data between a center side communication equipment and a terminal communication equipment in a radio 7 CONSTITUTION:When telewriting is implemented by calling an opposite equipment from a telewriting terminal equipment 20, a receiver of the terminal equipment 20 is at first hooked off. It is recognized by an NCU section 22 and when a telephone number of the opposite party is entered, a data conversion section 24 encodes an off-hook signal and an opposite telephone number or the like, a radio channel control section 25 selects a channel, through which a radio signal is sent to a center. A data conversion section 6 of the center recognizes a code and a dial function of an NCU section 4 is used to access a public line. When the line is connected, a code representing it is sent in a radio signal from a center communication equipment to a telewriting terminal equipment.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention provides communication between the other party's terminal and the public line, switching section,
The present invention relates to a wireless drawing communication system that performs drawing communication using wireless communication in a premises.

(B) Conventional technology Drawing communication terminals that have been developed in recent years display input handwritten information and manuscript information on their own display, and also transmit it to the other party via public lines. The information is displayed on the display section of the device, and the handwritten information and manuscript information displayed on the display section of the device are displayed on the display section of the device.While both parties are viewing the handwritten information and manuscript information displayed on the display section of their own devices, they can have a meeting over the phone using the telephone IR. A conventional drawing communication system using this type of i-picture communication terminal connects a public line directly to the drawing communication terminal.

(c) Problems to be solved by the invention The conventional drawing communication system described above directly connects public lines,
If a large number of drawing communication terminals are to be installed in a company's offices or business offices, a large number of lines will be required. Furthermore, even if a horizontal line telephone was to be installed, it was necessary to install a line for each wI image communication terminal, and there was a problem in that the mlij communication terminal could not be easily installed anywhere.

This invention has been made in view of the above-mentioned problems, and aims to provide an on-premises wireless drawing communication system that allows data to be freely exchanged with the other party no matter where the terminal is installed. .

(d) Means and operation for solving the problems The in-premise wireless drawing communication system of the present invention includes an exchange section to which a plurality of public lines are connected, and a dial function and a data synthesis function connected to the exchange section, respectively. A plurality of center-side communication devices including a network control unit that performs division, a data buffer unit that stores data, a data conversion unit that converts data into frames, and a wireless transmitter/receiver unit that transmits and receives data wirelessly, and each drawing communication terminal. The terminal communication device includes a network control unit, a data buffer unit for storing data, a data conversion unit for converting data into frames and transmitting the data, and a wireless transmitting/receiving unit for transmitting and receiving data wirelessly. ing.

In this local wireless drawing communication system, when data is transmitted from the drawing communication terminal to the other party's terminal, an off-hook signal and the other party's telephone number are transmitted from the wireless transmission/reception unit of the terminal communication device. The wireless transmitting/receiving section of the nearby center-side communication device receives this, and the network control section of the center-side communication device uses the dial function to access the public line of the switching section.

Once the line is connected to the other party, data transmission begins. While the data is stored in the data buffer section, it is framed in the data conversion section and sent out block by block ARQ (^
Data is transmitted while correcting transmission errors using an automatic repeat request (automatic repeat request) method. In the center side communication device, the data is converted back to normal data by the data converter and sent via the data buffer and network controller. Conversely, when data is sent from the other party, the data is stored in a data buffer, converted into a frame by a data converter, and transmitted wirelessly to the terminal communication device using the ARQ method.

(E) Examples The present invention will be explained in more detail with reference to Examples below.

FIG. 1 is a block diagram showing the configuration of a sensor side of a local wireless drawing communication system according to an embodiment of the present invention.

In the figure, a plurality (0) of public lines Ml are connected to the switching function section 2. The switching function section 2 has the number n of public lines.
Sensor-side communication device 3-1, 3-2, . . .
3-. 1 is connected. The center side communication device 3-1 includes an NCU section (network control section) 4, a data buffer 5, a data conversion section 6, a radio channel control section 7, and an antenna 8. Other center-side communication devices 3-2, . . . , 3 have similar configurations.

The switching function unit 2 always recognizes idle lines of the public line 1 and controls which lines are connected. In addition to the general exchange function, C such as V21, V27, V27ter, V29 etc.
It is configured to also comply with the CITT standard.

The network control unit 4 has a dialing function and also a function of combining and dividing drawing data and audio data. Since the data buffer section 5 performs the ARQ method,
Saves drawing data and manuscript data. Data converter 6
frames the data in order to perform the ARQ method.

The wireless channel control section 7 includes a transmitting/receiving section, and together with the antenna 8 constitutes the wireless transmitting/receiving section. In order to achieve high-speed data transmission, this wireless transmitting/receiving unit has separate wireless channels for transmitting and receiving directions with different frequencies, and also communicates using separate chaffles for drawing transmission and audio transmission. That is, four channels are provided for wireless communication between one terminal and the center. The selection and setting of this chaffle is performed by the wireless chuffle control section 7.

FIG. 2 is a block diagram of the terminal communication device of the in-premises wireless drawing communication device according to the embodiment. There is also an NCU on the drawing communication terminal 2o.
A terminal communication device 21 is provided, which includes a data buffer 22, a data buffer 23, a data conversion section 24, a radio channel control section 25, and an antenna 26. The functions of each part are the same as those of the corresponding center side communication device.

The drawing communication terminal 20 has a drawing communication function using handwritten information and voice, and a facsimile communication function for sending and receiving manuscript information. When implementing this system, a drawing communication terminal 20 equipped with a terminal communication device is installed in the vicinity corresponding to each center communication device 3-1, 3-2, . . . Low-power wireless communication is performed, and an ARQ method is also adopted for data exchange.

In this embodiment system, when the drawing communication terminal 20 calls the other party to perform drawing communication, first the receiver of the terminal 20 is off-hook.

The NCU unit 22 recognizes this, and when the other party's telephone number is input, the data converter 24 encodes the off-footer signal and the other party's telephone number, etc., and sends it to the radio channel control unit 25.
Select a channel and transmit wirelessly to the center. On the center side, for example, in the center communication device 3-1, the data conversion unit 6
The code is recognized by the NCU unit 4, and the dialing function of the NCU section 4 is used to access the public line. Next, when the line is connected, a code indicating this fact is wirelessly transmitted from the center communication device to the drawing communication terminal side. Next, the drawing communication terminal 20 communicates with the other party using the drawing communication function or the facsimile communication function. For example, in the case of drawing communication, the drawing communication command,
Transmits handwritten information and voice. At the time of transmission, the command and handwritten information data are stored in the data buffer 23, and the data converter 24 sequentially converts the data into frames and transmits them. When transmitting, the ARQ method is adopted, so each time one frame of data is transmitted, the center side
When the K signal is returned, the next frame of data is transmitted. When a NACK signal is returned from the center side, the data of the same frame as the previous one is repeated and transmitted. In this way, the data transmission between the center communication device 3 and the drawing communication terminal 20 is wireless transmission.
Since the RQ method is adopted, communication with fewer transmission errors can be performed. Data transmission from the center communication device to the drawing communication device can be considered in exactly the same way. In other words, among the data sent from the other party via the public line,
Handwritten information, manuscript information, etc. and voice data are separated in the NCU section 4, and the handwritten information, etc. is stored in a data buffer 5.
The data converter 6 converts the data into frames, and the wireless channel controller 6 transmits the image data and audio data on separate channels.

In addition, in the above system, by setting the wireless chatter being communicated in each center communication device and the drawing communication terminal, the communication can be monitored and a conference system can be constructed.

(F) Effects of the Invention According to the present invention, the center-side communication terminal is composed of a switching section to which a plurality of public lines are connected, a plurality of center-side communication devices, and a drawing communication terminal each equipped with a terminal communication device. Since data is exchanged wirelessly between the side communication device and the terminal communication device, there is no need to worry about the condition of the line facilities.
You can install a drawing communication terminal anywhere on the premises and communicate freely.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the center side of a local wireless drawing communication system according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of the terminal device side of the same system. 1, 1-2...1-72 public line, 2: switching function section, 3-3, 3-2...3-i: center side communication device,
4.2'27 NIJC section, 5.23: Data buffer. 6°24: Data conversion section, 7.25: Wireless channel control section, 8.26z antenna.

Claims (1)

[Claims] (1) A switching unit to which multiple public lines are connected, a network control unit connected to this switching unit that performs dialing functions, data synthesis and division, a data buffer unit that stores data, and a data frame that stores data. A plurality of center-side communication devices including a data converter to convert data, a wireless transmitter/receiver to send and receive data wirelessly, a network control unit provided for each drawing communication terminal, a data buffer unit to store data, and a data buffer unit to store data. An in-premises wireless drawing communication system comprising a terminal communication device including a data conversion unit for converting data into frames and transmitting the data, and a wireless transmitting/receiving unit for transmitting and receiving data wirelessly.