JPH03175745A - Inter-multistation bidirectional communication radio modem - Google Patents

Abstract

PURPOSE:To attain the inter-multistation bidirectional communication of a radio MODEM connected to an OA apparatus such as a personal computer by allowing the MODEM to act as a master station only at the time of calling a terminating station and driving a switch so as to execute high channel transmission and low channel reception. CONSTITUTION:In the case of calling and communicating with a terminating station as a master station, one wave in an fH band is outputted from a transmitting part 5 through an oscillation control part 7 and a signal processing part 8. At that time, a switch 4 connects the transmitting part 5 and a receiving part 6 respectively to a high pass filter 2 for an fH band and a low pass filter for an fL band. Out of the radio waves of the fH band radiated from an antenna 1, one response wave of the fL band generated from a calling station is received by the receiving part 6 in accordance with communication procedure in the law of radio waves, whether the station is a calling station or not is collated by a signal processing part 8 and interface with the OA apparatus 9 such as a personal computer is executed to execute data communication between the master station and a slave station. After completing the data communication, the switch 4 is switched, the MODEM is restored to a slave station to wait reception from a master station.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention provides office automation (OA) for wireless modems and personal computers (hereinafter referred to as personal computers) using specific low-power wireless stations and premises wireless stations. Wireless LAN (Local Area Network)
The present invention relates to a multi-station bidirectional communication radio modem that enables the following.

(Prior art) Conventionally, wireless modems for data transmission using specified low-power wireless stations and premises wireless stations do not have high and low channel switchers, and have one transmitter and one receiver, so high channel transmitter and receiver for low channel, or vice versa, the transmitting and receiving channels are fixed to either one. Therefore,
If the transmission from the master station is set to the high channel and the reception is set to the low channel, the reception by the slave station is set to the high channel and the transmission is set to the low channel, so that the channels of the master and slave stations are reversed.

Therefore, the communication operation mode is N, as shown in Figure 5.
And MAN is possible as shown in FIG. That is,
A is the master station, B is the slave station, fH is the high channel frequency, fL
When set to the low channel frequency, communication between master station A and slave station B is possible, but communication between master station A and master station A, and communication between slave stations B and slave stations B is not possible, so wireless communication is possible. It is not possible to construct a wireless LAN that connects a modem and office equipment such as a personal computer.

(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and can enable multi-station bidirectional communication of a dotted line modem connected to OA equipment such as a personal computer, and can also be used in a wireless LAN system. The purpose of the present invention is to provide a multi-station two-way communication radio modem that enables the construction of a multi-station two-way communication radio modem.

[Structure J of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention includes a transmitting section and a receiving section having high channel frequency and low channel frequency bands, and a transmitting section and a receiving section of the transmitting section and the receiving section. a transmission control unit that controls transmission; a signal processing unit that is connected to the oscillation control unit, the transmission unit, and the reception unit and interfaces with electronic equipment; and a signal processing unit that is switched and controlled via the signal processing unit and the transmission control unit to The device is characterized by comprising a switching device provided between a receiving section, a high-pass filter, and a low-pass filter, and a transmitting/receiving antenna connected to the high-pass filter and the low-pass filter, and a high channel of the assigned frequency. It is possible to send or receive data on any of the wireless channels, and it is possible to call and communicate with any party between multiple wireless modems.

(Function) By using the above means, the present invention becomes a master station only when calling the other party, and operates a switching device so as to perform high channel transmission and low channel reception. All other wireless modems that are waiting for reception are treated as slave stations, and their switches are operated to switch between high channel reception and low channel transmission, and they communicate with the called party. After completing communication, the master station operates a switch to change the channel to a slave station. This allows any wireless modem (connected to OA equipment such as a PC) installed within the radio wave coverage area to
CA (Multi Channel Access
) communication becomes possible and a wireless LAN can be established.

Note that it is also possible to reverse the channels of the master station and slave station.

(Example) FIG. 1 shows an example of the present invention. In Fig. 1, 1 is a transmitting and receiving antenna, 2 is a high-pass band filter (BPFI), 3 is a low-pass band filter (low-pass filter, BrF3), 4 is a switch, 5 is a transmitter, and 6
is the receiving section, 7 is the oscillation control section, 8 is the signal processing section, 9 is OA equipment (electronic equipment) such as a personal computer, fH is the high channel frequency, f7 is the low channel frequency, and the solid line with the arrow indicates the case of the master station. The dotted line with an arrow indicates the case of a slave station.

The transmitter 5 and the receiver 6 have bands of fH and fL. When calling and communicating with a partner as a master station, the transmitter 5 outputs one wave in the f band via the oscillation controller 7 and the signal processor 8. At this time, the transmitter 5 of the switch 4 is connected to the fH band high-pass filter 2, and the receiver 6 is connected to the fL band low-pass filter 3. The high-pass filter 2 and the low-pass filter 3 provide sufficient isolation to suppress interference between transmission and reception, thereby enabling full-duplex communication with the slave station.

A characteristic diagram of the high-pass filter 2 and the low-pass filter 3 is shown in FIG.

The f I4 band radio waves radiated from antenna 1 are response radio waves fL band 1 from the called party in accordance with the communication procedures of the Radio Law.
A receiving unit 6 receives the wave, a signal processing unit 8 verifies whether or not it is the called party, and then interfaces with OA equipment such as a personal computer to perform data communication between the master station and the slave station. After the data communication is completed, the switch 4 is automatically switched via the signal processing unit 8 and the oscillation control unit 7 to become a slave station and wait for reception from the master station.

FIG. 3 shows an example of an operational configuration diagram of the present invention. That is,
The wireless modems A1 to An interfaced with n office equipment such as personal computers can communicate with any other party using the MCA method, and two-way communication between multiple stations is possible. Arrows indicate communicable partners.

From this, it is possible to construct a wireless LAN system such as the example of the wireless LAN system diagram shown in FIG. In Figure 4, 11 is a server, 12 is a personal computer, 13 is a printer, 14 is an XY plotter, 15 is a word processor, 16
is a fax machine, and 17 is a repeater.

[Effects of the Invention] As explained above, according to the present invention, the OA of personal computers, etc.
It is possible to provide a wireless modem for bidirectional communication between multiple stations, which enables multi-station multi-directional communication between a wireless modem connected to a device and enables the construction of a wireless LAN system.

[Brief explanation of drawings]

FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, FIG. 2 is a characteristic diagram showing an example of the characteristics of the high-pass filter and low-pass filter shown in FIG. 1, and FIG. 3 is an example of the operational form of the invention. FIG. 4 is a system diagram showing an example of a wireless LAN system according to the present invention, and FIGS. 5 and 6 are configuration explanatory diagrams showing a conventional communication operation mode. 1... Transmitting/receiving antenna, 2... High pass band filter (high pass filter, BPFl) 3... Low pass band filter (low pass filter: 2)... Switching device,... Transmitting section, Receiving ...Oscillation control section, 8.Signal processing section, 9.OA equipment (electronic equipment) such as a personal computer

Claims (1)

[Claims] A transmitting section and a receiving section having high channel frequency and low channel frequency bands, a transmission control section that controls the transmission of the transmitting section and the receiving section, and an electronic device connected to the oscillation control section and the transmitting section and the receiving section. a signal processing unit that interfaces with the signal processing unit, and a switching device that is switched and controlled via the signal processing unit and the transmission control unit and is provided between the transmitting unit, the receiving unit, and the high-pass filter and the low-pass filter;
A multi-station two-way communication radio modem comprising a transmitting/receiving antenna connected to the high-pass filter and the low-pass filter.