JPS6359618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a status display method for a wireless device that performs end-of-call notification at a terminal station of a dual-frequency half-duplex multichannel access system (MCA).

Explanation of the conventional example and its problems Consisting of a plurality of base stations and a plurality of terminal stations classified into groups, a wireless channel connecting the base station and the terminal station is composed of at least one control channel and a plurality of communication channels, The base station broadcasts various control signals on the control channel, and the terminal station accesses the control channel of the base station and receives a call channel assignment according to the group to which the terminal station belongs, and each terminal station in the group is assigned. An MCA method is known in which communication is performed with terminal stations in the same group by relaying a base station using a two-frequency half-duplex method (as viewed from the base station) through a communication channel.

In this type of system, if a terminal station in a communication channel detects a radio wave interruption from the base station for two consecutive seconds, it is assumed that the call has ended and the communication channel returns to the control channel. The disadvantage was that the operator of the terminal station who did not know this would repeatedly make unnecessary calls.

Purpose of the Invention The present invention eliminates the above-mentioned drawbacks of the conventional technology, and provides a terminal station where a call has been terminated due to radio wave interruption, notifying the operator that the call has been terminated and making subsequent operations more efficient. This is the purpose.

Structure of the Invention The present invention starts the timer function and master function in the MCA when three pieces of information, call channel information, reception level information, and press switch reception status information, match, and after a predetermined period of time has elapsed,
It consists of a method of displaying on a display (including audio display).

DESCRIPTION OF EMBODIMENTS The present invention will be explained below by way of an embodiment thereof with reference to the drawings. In the figure, 1 is an antenna, 2 is a receiver, 3 is a reception level judger that determines the received electric field strength, 4 is a press switch that controls reception and transmission switching, 5 is a channel information terminal, and 6 is an AND (AND). circuit; 7 is a counter that measures time according to the output of the AND circuit 6; 8 is a display signal generator;
9 is a display.

Next, the operation will be explained.

The radio wave received by the antenna 1 enters the receiver 2, where the received field strength is determined by the received level determiner 3, and if it is lower than a certain level, "H" is output. On the other hand, the press switch 4 outputs a signal that is "H" when the terminal station is in the receiving state and "L" when the terminal station is in other states. Further, the channel information terminal 5 becomes "H" only when the channel concerned is a communication channel. These, the reception level determiner 3,
The output of the press switch 4 channel information terminal 5 is
It enters the AND circuit 6 and outputs "H" to the counter 7 only when the above three are "H", and "L" in other states. The input of counter 7 is “H”
When this happens, the time is measured and when it goes to "L", the previous measurement time is reset. When the measurement time reaches a certain predetermined time, the output of this counter generates a signal that drives the display signal generator, and the display 9 outputs a notification character or a notification sound.

Effects of the Invention As explained above, according to the present invention, it is possible to clearly notify the operator of a terminal station where a call has been terminated due to radio wave interruption, and to efficiently carry out subsequent operations. It has the advantage of being of great value in terms of operation.

[Brief explanation of the drawing]

The drawing is a block diagram of a device to which a wireless device status display method according to an embodiment of the present invention is applied. DESCRIPTION OF SYMBOLS 1...Antenna, 2...Receiver, 3...Reception level determiner, 4...Press switch, 5...Channel information terminal, 6...AND circuit, 7...Counter, 8...Display signal generator , 9...Display device.

Claims (1)

[Claims] 1 Consisting of a plurality of base stations and a plurality of terminal stations classified into groups, a wireless channel connecting the base station and the terminal station consists of at least one control channel and a plurality of communication channels, and the base station has various communication channels in the control channel. The control signal is broadcast, and the terminal station accesses the control channel of the base station and is assigned a communication channel according to the group to which the terminal station belongs, and each terminal station in the group receives two and a half frequencies on the assigned communication channel. Communication is performed with terminal stations in the same group by relaying the base station using the duplex method (as seen from the base station), and at the terminal station that is connected to the communication channel and is in communication, the receiver input voltage of the radio waves of that communication channel is continues,
When a certain set value or less elapses for a certain period of time, the emission of radio waves in the communication channel is restricted, the control channel capture operation is returned to, and the call is terminated, while the reception level of the receiver of the terminal station is is below a certain value, is in a receiving state, and is in a receiving channel, a timer means is started and a notification is given by display after a predetermined period of time has elapsed.