JPH01170135A - Mobile body communication equipment - Google Patents

Abstract

PURPOSE:To start a call always by means of an unoccupied channel without transmitting and receiving carriers by successively deciding and storing the existence of the carriers of both channels of a call and a control in the period of a standby condition, and simultaneously, successively updating the data of a memory. CONSTITUTION:When a power source is inputted and the standby condition is in, the existences of the carriers of transmitting frequencies T and receiving frequencies R of plural respective call channels except the control channel are successively decided, and the decision results are successively written to prescribed addresses corresponding to respective channels of a channel memory 10 up to an n-channel. The same decisions are executed as to the carriers of transmitting and receiving frequencies CT and CR of a control channel C, and the decision results are successively written to the corresponding address. Such deciding actions of the call and control channel are repeatedly executed successively in the period of the standby condition alternately, and the data of the channel memory 10 are updated.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to equipment for communication between mobile bodies such as cars and people, for example, mobile communication equipment such as cordless telephones.

<Prior art> In conventional mobile communications, only the presence or absence of a carrier for the frequency to be received, so-called carrier sense of the reception frequency, is performed, and if there is no carrier, it is possible to make a call, but the Based on the Radio Law, the system determines not only the carrier of the frequency to be transmitted, but also the presence or absence of the carrier of the frequency to be transmitted. revision is progressing.

<Object of the Invention> The present invention has been made in view of the above points, and an object of the present invention is to provide a mobile communication device that is compatible with the revision of the Radio Law.

<Structure of the Invention> In order to achieve the above-mentioned object, the present invention provides a memory in which data corresponding to the presence or absence of a carrier of the reception frequency and transmission frequency of each channel is written to a predetermined address corresponding to each channel. and determining means for sequentially determining the presence or absence of carriers of reception frequencies and transmission frequencies of communication channels and control channels during a period of standby state; and update means for sequentially updating data in the memory.

According to the above configuration, during the standby state period, the presence or absence of a carrier for the reception frequency and transmission frequency of the communication channel and control channel is constantly determined, the determination result is written to the memory, and the data in this memory is sequentially updated. Therefore, the presence or absence of carriers on the transmitting and receiving frequencies is constantly monitored.

<Embodiments> Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a multi-channel access mobile communication device according to an embodiment of the present invention.

This mobile communication device 1 includes a reception channel receiver 3 that receives radio waves from a partner mobile communication device (not shown) provided via an antenna 2, a transmission channel receiver 4 that receives the transmission radio waves itself, and a local A local oscillator 5 that provides an oscillation signal to each receiver 3.4, an IP detection circuit 6 that converts a desired signal from the signals from each receiver 3.4 into a medium wave interlayer wave number and detects it, and an IP detection circuit 6 that will be described later. A microcomputer 7 monitors the presence or absence of carriers in control channels and communication channels and performs other controls, a transmitter 8 modulates and transmits command signals from the microcomputer 7, and fixes the frequency of transmission and reception. It is equipped with a PLL circuit for

FIG. 2 is a block diagram of the microcomputer 7 shown in FIG. 1.

The mobile communication device 1 of this embodiment includes a channel memory IO in which data corresponding to the presence or absence of carriers of reception and transmission frequencies of each channel is written to a predetermined address corresponding to each channel, and a standby state after power is turned on. ,
During the so-called standby state, multiple (1-
n) determining means 11 for sequentially determining the presence or absence of carriers of reception frequencies and transmission frequencies of communication channels and control channels; and based on the determination results of this determination means 11, the channel memory l is
The update means 12 sequentially updates the data of O.

The determining means 11 has a built-in so-called carrier sense circuit that determines the presence or absence of a carrier, determines the presence or absence of a carrier based on the output of the carrier determination input port 14, and provides the determination result to the updating means 12. In this embodiment, "0" is output when a carrier is present, and rlJ data is output when a carrier is absent. Furthermore, this determining means 1
Reference numeral 1 provides a control signal for controlling the PLL circuit 9 as a PLL channel regular output port, and controls the PLL circuit 9 to sequentially determine the carrier of each communication channel and control channel.

The updating means 12 writes the output of the determining means 11 to a predetermined address corresponding to each channel of the channel memory 10, and sequentially updates the data in the channel memory 10.

Furthermore, at the start of a call, the mobile communication device l of this embodiment uses the data in the channel memory 10 and the data in the channel memory transmitted from the other party's mobile communication device (not shown) and given via the serial data input port 13. Based on the above information, an empty channel search means 17 is provided for searching for an empty channel and selecting the empty channel as a communication channel.

Note that 16 is a serial data output port for outputting the output of the empty channel search means 17 to the transmitter 8.

Next, the operation of the mobile communication device 4 having the above configuration will be explained based on the table below. This table shows the determination of the presence or absence of a carrier in each channel over time and the contents of data in the channel memory 10 in which the determination results are written.

In the table, channel IT indicates the transmission frequency of n channel, IR indicates the reception frequency of 1 channel,
Below, each frequency up to n channels is shown in the same way. Also, CT indicates the transmission frequency of the control channel,
CR indicates the reception frequency of the control channel.

(Hereafter, blank space) Mobile communication device of this example! As shown in the table, first, when the power is turned on and enters the standby state, the carriers of the transmitting frequency (T) and receiving frequency (R) of each of the plurality (1-n) communication channels excluding the control channel are For example, if there is a carrier, "O
'', if there is no carrier, the data of rlJ is sequentially written to a predetermined address corresponding to each channel of the channel memory 10 up to n channels.

Then, the same determination as above is performed alternately with the determination of the transmission of control channel C and the carrier of reception frequencies CT and CR, and the determination results are sequentially written to the corresponding addresses. This operation of alternately determining the call channel and the control channel is sequentially repeated during the standby state to update the data in the channel memory IO.

When starting transmission, an empty channel is searched based on the data in the channel memory 10, and a call is started.

In this way, during the standby state, the presence or absence of carriers for transmitting and receiving frequencies on the control channel and multiple communication channels is constantly monitored, so that calls using empty channels with no carriers for transmitting and receiving frequencies can be avoided. You can start at any time.

<Effects of the Invention> As described above, according to the present invention, during the standby state, the presence or absence of a carrier of the receiving frequency and the transmitting frequency of the communication channel and the control channel is sequentially determined, and the data of the determination results is stored in the memory. Since the data is stored and sequentially updated, it is possible to start a call at any time on an empty channel with no carriers for transmitting and receiving frequencies.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a mobile communication device according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of the microcomputer shown in FIG. 1. DESCRIPTION OF SYMBOLS 1... Mobile communication device, 7... Microcomputer, 10... Channel memory, 11... Judgment means, I2... Update means.

Claims (1)

[Claims] (1) A memory in which data corresponding to the presence or absence of a carrier for the reception frequency and transmission frequency of each channel is written to a predetermined address corresponding to each channel; and determining means for sequentially determining the presence or absence of a carrier of a transmission frequency, and updating means for sequentially updating data in the memory during a standby state based on the determination result of the determining means. Mobile communication equipment.