JPH01174131A - Radio communication system - Google Patents

Abstract

PURPOSE:To make the system immune from the interference from the 3rd party by revising a control signal between a base station and a slave station at all times without keeping the signal constant. CONSTITUTION:In order to open a radio line, it is required to give/receive a control signal between radio telephone sets 11 and 12. In order to inform which of plural control signals is to be used to the radio telephone set 12 among plural control signals, the radio telephone set 11 includes one of identification codes A-C into a start signal. When the radio telephone set 11 receives a control signal corresponding to an incoming identification code, the radio telephone set 12 opens a gate 3 by a control section 2 to open the radio line. When the radio set 12 makes transmission, a control signal is added to the head of the transmission signal.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a wireless communication system such as a wireless telephone system,
In particular, the present invention relates to a wireless communication system that establishes a wireless link between a base station and a slave station by sending a control signal from one station to the other station.

(Prior Art) Conventionally, in this type of wireless communication system, a tone or a combination of tones,
Or, by predetermining a control signal consisting of a digital signal,
These control signals are transmitted in a predetermined order, and when the receiving station recognizes that the predetermined control signals have been received in a predetermined order, a wireless link is established between the master station and the slave station. ing.

(Problems to be Solved by the Invention) In the method for establishing a wireless line in the conventional wireless communication system described above, since the control signal is determined in advance, the control signal is easily known to a third party; If the control signal is known, the device can be easily controlled by a third party. Of course, there is a high-class technology that uses encryption to prevent such interference, but communication methods that use encryption require expensive equipment, and inexpensive wireless telephone equipment (
It is not suitable for wireless communication methods such as transceivers).

As mentioned above, conventional wireless communication systems have problems in that they are susceptible to interference by third parties or that the devices are expensive.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a wireless communication system that is less susceptible to interference by third parties and that can be manufactured at low cost.

(Means for Solving the Problems) Means provided by the present invention to solve the above-mentioned problems is a wireless communication system that establishes a wireless line every time communication occurs between two wireless stations, It stores an antenna, a radio section that transmits and receives high-frequency signals between the antenna, a gate that opens and closes the baseband signal line to be transmitted or received, and identification codes of a plurality of control signals. a control unit that notifies the wireless unit of the control signal corresponding to the selected one identification code; a selection means that selects any one of the identification codes and sends the selected one to the control unit; and an activation switch. are provided in each of the wireless stations, and when the activation switch of one of the wireless stations is turned on, the control unit of the station instructs the wireless unit to transmit the identification code selected by the selection means. In the other radio station that received the identification code from the one radio station, the control unit decodes the identification code, notifies the radio unit of the identification code, and then When receiving the control signal corresponding to the identification code from a wireless station, the control unit opens the gate to establish a wireless line with the one wireless station, and when transmitting to the one station. The radio unit is characterized in that the wireless unit initially transmits the control signal corresponding to the identification code notified from the control unit.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a conceptual diagram showing the configuration of a wireless telephone system that is an embodiment of the wireless communication system of the present invention.

In this figure, 1 is a radio section, 2 is a control section, 3 is a gate,
11.12 is a radio telephone device, 13.14 is an antenna, 15
, 16 is a telephone, and 17 is an exchange. The radio telephone device 11 is a base station, and the radio telephone device 12 is a slave station. The wireless telephone devices 11 and 12 have identification codes A and B in the control unit 2.
, C are stored in advance, and one of the #J subsignals corresponding to these identification codes A, B, and C is selected to establish a communication line. When one of the identification codes A, B, and C is selected by the control unit 2, the selected identification code is notified to the radio unit 1, and a control signal corresponding to the identification code is input to the control unit 2. Then, the control section 2 opens the gate 3.

Here, the operation when activated from the radio telephone device 11 on the base station side will be described below. First, in order to establish a wireless line, M control signals must be exchanged between the wireless telephone devices 11 and 12. One of the identification codes A, B, C is included in the activation signal to inform the device 12. If the activation signal includes the identification code B, the control unit 2 of the wireless telephone device 12 recognizes the identification code B, and the control signal to be used thereafter is the one corresponding to the identification code B (control signal ).

The operation after recognition of the identification code included in the activation signal is similar to a conventional wireless telephone system. That is, in the above example, upon receiving the control signal corresponding to the identification code B from the radio telephone device 11, the control unit 2 in the radio telephone device 12 opens the gate 3 and establishes a radio line. When the radio telephone device 12 transmits, it adds a control signal to the beginning of the transmitted signal.

The above has described activation from the base station side, but the same applies to activation from the slave station side.

Furthermore, although this embodiment includes data on which control signal to use at startup, it is of course possible to send this at any point in the line connection procedure.

Thus, in this example, one control signal used is
It is difficult for a third party to predict which control signal will be selected from a plurality of control signals to establish a wireless line connection because the selection of the identification code at startup is arbitrary.

(Effects of the Invention) As described above, in the present invention, a plurality of control signals are prepared for one control function, and are arbitrarily selected. Therefore, since the control signal between the base station and the slave station is not constant and is constantly changed, interference by third parties is difficult and the device can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing the configuration of a wireless telephone system that is an embodiment of the wireless communication system of the present invention. 1... Radio section, 2... Control section, 3... Gate, 1
1... Radio telephone device (base station side), 12... Radio telephone device (slave station side), 13.14... Antenna, 15.
16...Telephone.

Claims (1)

[Claims] In a wireless communication system in which a wireless line is established every time communication is made between two wireless stations, an antenna, a radio section that exchanges high-frequency signals for transmission and reception between the antenna, and a transmission or A gate that opens and closes a line for a received baseband signal, and a control unit that stores identification codes of a plurality of control signals and notifies the wireless unit of the control signal corresponding to the selected identification code. and a selection means for selecting any one of the identification codes and transmitting the selected one to the control unit, and an activation switch, each of the wireless stations being provided with the activation switch of one of the wireless stations being turned on. When the control unit of the station instructs the radio unit to transmit the identification code selected by the selection means, and in the other radio station that has received the identification code from the one radio station, The control section decodes the identification code and notifies the radio section of the identification code, and then when receiving the control signal corresponding to the identification code from the one radio station, the control section decodes the identification code. to open a wireless line with the one wireless station, and when transmitting to the one station, the wireless section transmits the control signal corresponding to the identification code notified from the control section. A wireless communication method characterized by initially transmitting the information.