JP2990592B2 - Wireless communication equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to channel control for switching a channel simultaneously with a partner station as required during communication of a radio communication device.

[0002]

2. Description of the Related Art When communicating with a partner station through a channel selected from a plurality of channels, if a communication condition cannot be continued due to interference, it is necessary to shift to another channel. Must suspend communication, search for another free channel, return to the communicating channel with interference again, and communicate the channel to be switched to the communicating partner station.If the interference is severe, the partner station can not understand There is also a situation where each station cannot avoid interference if there is no response from the partner station.

In the case of an MCA communication system in which a channel is allocated using a control channel for communication between a base station and a mobile station, the mobile station moves within a service area of the base station, and the mobile station measures a signal-to-noise ratio. If the measured value deteriorates and a communication request is subsequently issued, a base station having high sensitivity at another base station issues a response signal, and communication is continued on a channel designated by the base station.

[0004]

When the transmission and reception are performed at the same frequency, the communication becomes intense and the desired communication cannot be performed. Contact with the partner station may not be possible. An object of the present invention is to provide a wireless communication device that enables a channel change that quickly leaves such an abnormal communication state.

[0005]

SUMMARY OF THE INVENTION In a wireless communication device which is unable to communicate due to unnecessary radio waves in a channel being communicated and switches to another empty channel, it searches for an empty channel and attaches a switching control signal to the detected empty channel. Means for generating a channel switching signal, a communication state detecting means for detecting a communicable level by lowering the level of unnecessary radio waves of the channel under communication, and a communication state detecting means for detecting the channel switching signal by the detection signal of the communication state detecting means. Means for transmitting, a channel switching means for transmitting a switching acknowledge signal when a partner station of communication detects the reception of the channel switching signal and switching to a channel designated by the channel switching signal, and a standby state for transmitting the channel switching signal Means for switching to a channel specified by a channel switching signal upon detection of reception of the switching acknowledge signal. .

[0006]

FIG. 1 is a block diagram of a wireless communication apparatus according to an embodiment of the present invention, and FIG. 1 will be described.
In the figure, 1 is an antenna, 2 is a transmission unit, 3 is a reception unit, 4 is a control unit, 5 is a memory, 6 is a small number of switches required for mode switching and transmission / reception, and a combination of numbers and stored in the memory 5 An operation unit comprising a keyboard for reading the data and setting various settings; 7, a DTMF generator;
Is a DTMF receiver.

In FIG. 1, D is used as a selective call signal.
Although the configuration of the wireless communication device using the TMF is adopted, a plurality of selective call signals are generally used properly. DT
MF and DCS can be properly used as needed, or STCS
Although S is used in combination, DTMF will be described as a representative here.

When the communication channel with the partner station cannot be changed due to an unnecessary radio wave due to interference or noise during communication with the partner station selected by the DTMF signal and the communication channel is changed, first, the operation unit 6 is operated. To scan for channels to search for available channels. If there is an available channel, the channel number is input to the control unit 4, a switching control signal is set from the operation unit 6, and combined with the available channel to form a channel switching signal. , And holds the signal. The DTMF channel switching signal has a length of about several hundred milliseconds. It is set so as to output when the transmission unit 2 is driven.

The receiving section 3 continuously receives the interference state of the operating channel, sets the unnecessary radio wave level discrimination by the interference radio wave from the operation section 6, and starts the unnecessary radio wave level discriminating means. The unnecessary radio wave level determination means sets a threshold value of a level at which the reception detection output can communicate, determines whether the reception detection signal is higher or lower than the threshold value, and determines whether the reception detection signal is below the threshold value. Then, a signal is sent to the control unit 4. The control unit 4 ends the determination of the unnecessary radio wave level with the received signal and outputs a control signal indicating that transmission is possible to the transmission unit 2. The transmission unit 2 is driven by the control signal indicating that transmission is possible, and transmits the DTMF channel switching signal on the currently communicating channel.

While the other station is in the interference state and the standby state continues, the signal received by the receiving unit 3 is transmitted to the DTMF.
The signal is input to the receiver 8 to detect the DTMF signal. If there is a channel switching signal, the DTMF generator 7 converts the switching acknowledgment signal into DTMF and transmits it from the transmitting unit 2. At the same time, the transmitting unit 2 also sends the receiving unit 3 to the channel designated to supply the received channel switching signal to the control unit 4.
Also switches.

In the radio station that has transmitted the channel switching signal,
After the transmission, it enters a standby state, waits for a response signal from the partner station, and when the signal received from the received signal into the DTMF receiver 8 includes a switching acknowledge signal, the signal is captured by the control unit 4,
Switching to the channel specified by the channel switching signal temporarily stored in the memory 5 enables communication on a new channel.

FIG. 2 is a flow chart showing channel switching between communicating radio stations according to an embodiment of the present invention. FIG. 2 will be described from the flowchart of FIG.
(A) is one of the communicating radio stations, and the decision box H
If interference occurs during communication in step 1, an empty channel is searched in the decision box H2 for channel switching. Processing S1
A channel control signal is generated by adding a switching control signal to the vacant channel searched in step (1). The channel switching signal is formed into a DTMF signal in processing S2. The interruption of the interference is detected in the decision box H3, and when the interference is interrupted, the channel change signal is transmitted in the process S3, and the process returns to the standby state in the process S4.

The communication partner station executes the flowchart of FIG. If interference occurs during communication in the decision box H5 and a channel switching signal is detected from the signals received in the decision box H6, the transmission / reception setting is changed to the channel specified in step S6, and the change acknowledge signal is sent in step S7. It transmits and enters a standby state in step S8.

Returning to the flowchart on the side (a) again, when a change acknowledgment signal is detected from the signal received in the decision box H4 from the standby state in the processing S4, the transmission / reception setting is made to the channel specified by the channel switching signal transmitted in the processing S5. Is switched to the communication state again.

[0015]

According to the present invention, at the time of channel switching when communication becomes impossible due to interference or unnecessary radio waves of noise, a channel switching signal is output from one station using a selective call signal and received. In response, the partner station outputs a switching acknowledge signal to switch to the channel specified by the channel switching signal. Similarly, when the side that transmitted the channel switching signal receives the switching acknowledge signal in the standby state, it can switch to the same channel and resume communication. During the time required for this switching, all processes other than the search for an empty channel are automatically processed. Therefore, the channel switching is completed at the same time in at most about 1 sec, so that the communication can be promptly restarted.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wireless communication device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing channel switching between communicating radio stations according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Transmission part 3 Receiving part 4 Control part 5 Memory 6 Operation part 7 DTMF generator 8 DTMF receiver

Claims (1)

(57) [Claims] 1. A wireless communication device in which communication is disabled due to unnecessary radio waves in a channel being communicated and switching to another empty channel is performed, and a channel control is performed by searching for an empty channel and adding a switching control signal to the detected empty channel. Means for creating a signal; communication state detection means for detecting a level at which communication is possible when the level of unnecessary radio waves of the channel being communicated drops; and means for transmitting the channel switching signal with a detection signal of the communication state detection means. A channel switching means for transmitting a switching acknowledge signal when a communication partner station detects the reception of the channel switching signal and switching to a channel specified by the channel switching signal; and A means for switching to the channel specified by the channel switching signal when a switching completion signal is detected is received, enabling quick channel switching. Wireless communication device, characterized in that the.