JP3148911B2 - Digital radio telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radio telephone having a control channel detecting device.

[0002]

2. Description of the Related Art In recent years, the development of wireless communication devices has been remarkable and has been used by many people.
A digital radio telephone device is one of them.

Hereinafter, a conventional digital radio telephone device will be described with reference to the drawings. FIG. 4 is a block diagram showing the configuration of a conventional digital radio telephone device. In the figure, 1 is a control channel control device for controlling a control channel, 2 is a communication channel control device for controlling a communication channel, 3 is a display unit, 4 is an operation unit for an operator to input instructions, and 5 is an entire device. It is a control unit that controls the operation.

In the above configuration, when a control channel transmission request is generated, for example, by calling a slave unit from a master unit of the digital radio telephone, the control unit 5 controls the control channel control unit 1 to transmit the control channel. ing.

[0005]

In such a conventional digital radio telephone, the frequency and cycle of the control channel of another digital radio telephone currently being transmitted and the control transmitted by its own digital radio telephone are described. When the frequency and the cycle of the channel are the same, there is a problem that the control channel interferes for a long time, the signal for establishing the communication channel does not reach the slave unit, and it becomes difficult to establish the communication channel. .

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and it is possible to stably establish a communication channel with a slave unit by preventing interference of a control channel, and to easily avoid a case where interference occurs. It is an object to provide a wireless telephone device.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention detects control channels transmitted at the same frequency as that transmitted from its own digital radio telephone, and transmits each control channel. A control channel detection device for detecting a period and a transmission timing in accordance with an identification code of a control channel, and transmission of its own control channel based on control channel period information and transmission timing information output by the control channel detection device A transmission timing determining device for determining timing, and control channel control for controlling transmission of its own control channel based on period information and transmission timing information output by the control channel detecting device and timing information output by the transmission timing determining device And a digital wireless telephone device provided with the device.

[0008]

According to the present invention, in the above configuration, the control channel detecting device detects the control channel being transmitted to the space, detects the period and the transmission timing, and the transmission timing determining device detects the control channel based on the period and the transmission timing. To determine the timing of transmitting its own control channel. The control channel control device controls the transmission of the control channel based on the status of the control channel output by the control channel detection device and the timing output by the transmission timing device.

[0009]

(Embodiment 1) An embodiment of a digital radio telephone apparatus according to the present invention according to claims 1, 2 and 3 will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of this embodiment. The same components as those in the conventional example are given the same numbers. This embodiment is different from the conventional example in that a control channel detecting device 6 which detects a control channel being transmitted and outputs its status.
And a transmission timing determining device 7 that determines the timing of transmitting its own control channel according to the above situation.

The interrelationship and operation of the above components will be described. First, the operation of the control channel detection device 6 will be described. The control channel detecting device 6 detects control channels transmitted near its own digital radio telephone device, calculates the period of each control channel, and detects the timing. FIG. 2 is a flowchart showing the operation of the control channel detection device 6. In the figure,
When a control channel transmission request is issued to the control unit 8, a control channel detection operation is started. In step 1, a timer for measuring time is started, and the process proceeds to step 2. The timer is set so as to operate only for a predetermined period. In step 2, it is checked whether or not the period has elapsed. If the period has elapsed, the timer ends.
During the predetermined period, a control channel having a specific frequency transmitted by its own digital radio telephone device is always detected in step 3, and if not detected, the detection is continued in a loop of steps 2 and 3. When the control channel is detected in step 3, the process proceeds to step 4 to check the identification code of the control channel, and check whether or not the identification code is the identification code stored in Table B. Table B is a storage device for storing the identification code of the detected control channel and its cycle and timing.

If it is determined in step 4 that the identification code of the detected control channel is stored in the table B, the cycle and timing are detected, the process returns to step 2, and the detection is continued. In step 4, if the detected identification code of the control channel is not the one stored in the table B, the process proceeds to step 5, and whether or not the identification code is received for the first time is detected by referring to the table A. Table A is a storage device for storing data for which cycle calculation and timing detection have not been completed. If the identification code of the control channel detected in step 5 is the first reception, the process proceeds to step 8 and temporarily stores the identification code and the reception time, that is, time information, in table A. In step 5,
If the identification code is for a control channel that has already been detected, the transmission cycle of the control channel is detected by comparing it with the time information at the time of previous reception stored in table A, and is transmitted to table B together with the timing. Remember. This timing may be, for example, a value measured based on the time when the timer starts operating. By repeating the above operation for a predetermined period of the timer, the cycle and the transmission timing of each control channel transmitted in the vicinity are stored in the table B, respectively.

Next, the operation of the transmission timing determining device 7 will be described. FIG. 3 is a timing chart showing the transmission timing of the control channel determined by the transmission timing determination device 7. In the figure, ○, ◎ and ● indicate transmission timings of control channels transmitted by other digital radio telephones, and ◇ indicate transmission timings of control channels transmitted by own digital radio telephones. . In FIG. 3 (a), the cycle of each control channel transmitted by another digital radio telephone apparatus is cycle 5, while the cycle of the control channel transmitted by its own digital radio telephone apparatus is cycle 3. Therefore, the system is different from the cycle of other devices. In this case, since the cycle is different from that of the other devices, there is no possibility that interference will continue between the control channels forever. Therefore, the control channel is transmitted at an arbitrary timing. On the other hand, if the cycle of its own control channel is the same as the transmission cycle of the control channel of another device, it should be as far as possible from other control channels so as not to overlap with the transmission timing of other control channels. It is decided to transmit at the timing. FIG.
In (b), when one of the control channels of the other device is transmitted and the interval of the timing at which one of the control channels is transmitted is calculated with reference to the data of the table B, the period of the longest interval is as follows. There is a mark between − and ◎, and a mark between ● and ○. Therefore, its own control channel is set in the middle between the circles and the circles or between the circles and the circles. FIG. 3C shows the transmission timing of its own control channel determined in this way. In this case, the transmission cycle of each control channel is cycle 5. By transmitting the control channel in this way, the control channel does not interfere and the next communication channel can be established stably.

As described above, according to the digital radio telephone of this embodiment, prior to transmitting its own control channel, it receives the control channel transmitted by another digital radio telephone and detects its timing. When the period of its own control channel is different from any of the detected periods of the control channel, its own control channel is transmitted at an arbitrary timing. Since the transmission is performed so as not to overlap the transmission timing of the control channel, the communication channel can be stably established without the control channel of the own device interfering with the control channel of another device.

(Embodiment 2) An embodiment of a digital radio telephone apparatus according to the present invention according to claims 1, 2 and 4 will be described below. The configuration of the present embodiment is the same as that of FIG. 1 in a block diagram, and the operations of the control channel detecting device 6 and the transmission timing determining device 7 are the same as those of the first embodiment. This embodiment differs from the first embodiment in the control operation of the control channel control device 1. When a control channel is interrupted and transmitted from another digital radio telephone device while its own digital radio telephone device is transmitting a control channel, interference occurs if the timings of both devices are superimposed or close to each other. . This interference is a phenomenon that has not occurred when the parent device transmits the control channel. In this embodiment, in order to avoid this interference, the transmission of its own control channel is temporarily stopped when the interference occurs, and the interference avoiding operation of transmitting the control channel again at another timing is executed.

FIG. 4 is a timing chart showing the timing of control channel transmission in this embodiment. FIG.
(A) shows a state where another control channel is not transmitted. In this embodiment, the control channel detecting device 6 always checks the control channels transmitted from itself and other devices, and the control channel control device 1 determines that the other control channels are within a predetermined range of the transmission timing of the own control channel. If it is interrupted, the transmission of its own control channel is stopped on the assumption that interference will occur. FIG. 4 (b) shows a state in which another control channel has interrupted the transmission timing of its own control channel closely at an interval corresponding to period 2. Now, assuming that the predetermined range is an interval corresponding to cycle 3 with respect to its own transmission timing, the control channel control device 1 determines that interference has occurred and stops transmission of the control channel. Next, the transmission timing determination device 7 determines the transmission timing so that the transmission timing of another control channel is outside a predetermined range of its own control channel, and instructs the control channel control device. FIG. 4 (c)
Indicates the transmission timing specified by the transmission timing determination device 7. With this operation, the communication channel can be stably established without interference with other control channels.

As described above, according to the digital radio telephone of this embodiment, the control channel detecting device 6 checks the control channels transmitted by itself and other digital radio telephones, and the other control channels control their own. When it is detected that the transmission timing of the channel is within a predetermined range, the control channel control device 1 temporarily stops transmission of its own control channel, and performs control at a transmission timing outside the range determined by the transmission timing determination device 7. By transmitting the channel, it is possible to stably establish the communication channel without causing interference with other control channels.

(Embodiment 3) An embodiment of the digital radio telephone apparatus according to the present invention according to claims 1, 2 and 5 will be described below. The configuration of this embodiment is the same as that of the first embodiment when shown in a block diagram. This embodiment differs from the first embodiment in the operation of the control channel control device. As in the first embodiment, the control channel detecting device 6 constantly detects the control channels transmitted by itself and other digital wireless telephone devices, calculates its period, and checks the transmission timing. In the first and second embodiments, the operation of avoiding interference is performed by changing the transmission timing of the own control channel even if the transmission cycle of the own control channel is the same as the transmission cycle of another control channel. When a large number of control channels are transmitted, there is a case where there is no room for selecting a transmission timing. This embodiment is one of the means corresponding to the above case. When the period of the control channel transmitted by another device is the same as the period of the control channel transmitted by itself, the control channel control device 1 Controls the transmission cycle of the control channel transmitted by itself to be different from the transmission cycle of the other control channels so as to perform transmission. Therefore, its own control channel does not interfere with the control channel of another device.

As described above, according to the digital radio telephone of the present embodiment, the control channel detecting device 6 detects the control channel transmitted by itself and other devices, checks its cycle and transmission timing, and controls When the transmission cycle of its own control channel is the same as the transmission cycle of another control channel, the channel control apparatus 1 changes the transmission cycle of its own control channel to a different cycle from that of the other control channels, and transmits the channel. Thus, a communication channel can be established without causing interference.

[0019]

As is apparent from the above description, the present invention detects a control channel transmitted at the same frequency as that transmitted from its own digital radio telephone,
A control channel detection device for detecting a transmission cycle and a transmission timing of each control channel in accordance with an identification code of the control channel; A transmission timing determining device for determining the transmission timing of the control channel, and transmitting its own control channel based on the period information and the transmission timing information output by the control channel detecting device and the timing information output by the transmission timing determining device. By providing a control channel control device for controlling, it is possible to eliminate a control channel interference between a master unit and a slave unit of the digital wireless telephone device, to stably establish a communication channel, and to control the number of transmitted control channels. Control channel can be stably established even when there are many channels.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a digital wireless telephone device according to the present invention.

FIG. 2 is a flowchart showing the operation of period calculation and transmission timing detection in the control channel detection device of the digital wireless telephone device of the present invention.

FIG. 3 is a timing chart showing control channel transmission timing in the first embodiment of the digital wireless telephone device according to the present invention;

FIG. 4 is a timing chart showing a control channel transmission timing in the digital wireless telephone device according to the second embodiment of the present invention;

FIG. 5 is a block diagram showing a configuration of one embodiment of a conventional digital radio telephone device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 control channel control device 2 communication channel control device 3 display device 4 operation device 5 control device 6 control channel detection device 7 transmission timing determination device

Claims (5)

(57) [Claims] 1. A control channel transmitted at the same frequency as a frequency transmitted from its own digital wireless telephone device is detected, and a transmission cycle and a transmission timing of each control channel are detected in accordance with an identification code of the control channel. A control channel detection device, a transmission timing determination device that determines the transmission timing of its own control channel based on the control channel period information and transmission timing information output by the control channel detection device, and the control channel detection device A digital radio telephone device comprising: a control channel control device that controls transmission of its own control channel based on output period information, transmission timing information, and timing information output from a transmission timing determining device. 2. A control channel detection device comprising a timer device and a storage device, wherein when the transmission request of its own control channel occurs, the control device detects the control channel by activating the timer device and starts detecting the control channel. 2. The detection time is temporarily stored in the storage device together with the identification code, and then a transmission cycle is calculated based on a difference from a time when a control channel having the same identification code is detected, and stored together with the transmission timing. A digital wireless telephone device as described. 3. If the transmission cycle of the control channel from another device detected by the control channel detection apparatus is different from the transmission cycle of its own control channel, an arbitrary timing is determined as the transmission timing of its own control channel. If the same, the transmission timing determining device determines the timing that does not overlap with the transmission timing of another control channel as the transmission timing, and transmits its own control channel at the timing determined by the transmission timing determining device. 2. The digital radio telephone device according to claim 1, further comprising a control channel control device that performs the control. 4. When the control channel from another device detected by the control channel detection device is close to the transmission timing of its own control channel within a predetermined range, the control channel control device transmits its own control channel. Once stopped, the transmission timing determining means determines the transmission timing of its own control channel so that there is no control channel of another device within the predetermined range, and the control channel control device transmits its own control channel again at that timing. 2. The digital wireless telephone device according to claim 1, wherein 5. A control channel control apparatus according to claim 1, wherein the control channel detecting apparatus detects a control channel transmission cycle from another apparatus equal to its own control channel transmission cycle, and the control channel control apparatus sets its own control channel transmission cycle to another apparatus. 2. The digital radio telephone device according to claim 1, wherein the transmission is performed by changing the transmission channel to a period different from the transmission period of the control channel.