KR20000062908A - Method for confirming communication range - Google Patents

Abstract

The present application is directed to a method for identifying a coverage right that may reduce interference at the time of receiving a code when multiple radio stations perform the function of checking the coverage right at the same time. For the identification code, one sound frequency selected from the CTCSS frequencies is used so that the transmission of the confirmation signal is performed at any optional random timing set by the interval timer.

Description

{Method for confirming communication range}

The present invention relates to a method of confirming a call right, and more particularly, to a method of checking a call right to determine whether the wireless communication devices are located in the call right so that they can talk to each other.

It is known that such a system can allow multiple wireless communication devices to communicate by using the same frequency at the same time.

FIG. 6 shows an example of such a communication system in which different identification codes are assigned to each of the wireless stations.

For example, in the system shown in Fig. 6, "10" is provided to the radio station A as a digital code, "1" is provided to the radio station B, and "10" is provided to the radio station C. These codes are each provided as identification codes.

In this case, radio station A performs transmission at frequency f towards radio station B and radio station B performs reception at this same frequency, but identification assigned to radio station A and radio station B, respectively. Since the codes are different from each other, this transmission cannot be performed with each other.

However, since the same identification code " 10 " is assigned to radio station A and radio station C, these two radio stations A and C may be communicated for a call when located in a mutual coverage area.

In this case, as a method for confirming whether the radio station A and the radio station C are located in the mutual coverage area, when an identification code provided in digital codes is mutually detected and this code is detected, the receiving party is located in the coverage area. The receiving party notifies the other party, and when the code is not detected, it notifies the other party that the receiving party is not located in the coverage area.

The confirmation of the call right can be performed by displaying a notification on the indication of the radio station or by generating a predetermined sound signal.

7 and 8 are control flow diagrams illustrating such a conventional method of confirming a call right.

Presently, assume that a first radio station and a second radio station perform transmission and reception at the same frequency and the same digital identification code is assigned to them. Here, typically, the digital identification code is converted into a dual tone multi frequency (DTMF) signal added to the transmission frequency for transmission.

In the case where the first radio station and the second radio station perform call right verification whether two parties are talking, first, the call right checking function provided to the two radio stations is turned on (steps 101a and 101b). Next, the fixed right timer for checking the call right installed in the first radio station is set to a predetermined time, for example, 60 seconds (step 102). In addition, when the set time set by this fixed timer has elapsed, the provided identification code of the predetermined transmission frequency itself is converted into a DTMF signal and added to the predetermined transmission frequency f, and as a result, the signal is transmitted to the second radio station.

Since the second radio station enters the standby state at this stage, it is detected whether the identification code under the transmission frequency f transmitted from the first radio station corresponds to its identification code and whether it can be received (step 104). Here, when reception detection is possible, a mark (☆) indicating detection is displayed on the display, and the timer for checking the call right is set to 60 seconds (step 105). On the other hand, when reception detection is not possible, the mark ☆ does not appear and the timer is set to 60 seconds (step 106).

In this step when the 60-second set time of the fixed timer has elapsed, the second radio station adds its identification code to the transmission transmission frequency f for the first radio station (step 107). The first radio station determines whether to detect this (step 108).

When reception detection is enabled, the mark ☆ is displayed as in the second station and again the timer is reset to 60 seconds (step 109). When detection is not possible, the mark ☆ does not appear and the timer is reset to 60 seconds (step 110).

Thus, when the mark (☆) appears at the two radio stations in steps 105 and 109, the two radio stations are located in the coverage area and can talk, and thus a predetermined call is performed. In the case where a predetermined time has elapsed and the right to check is again checked, the same operation as in step 103 is performed in step 111.

If mark (*) is already displayed and reception is detected at the second radio station in step 112, mark (☆) appears continuously and the timer is reset to 60 seconds. On the other hand, if detection is not possible, the mark ☆ goes out and a beep (notification sound) is output so that the second radio station knows that the first radio station is already outside the coverage area (step 114). Next, the timer is set again to 60 seconds and after the set time of the timer has elapsed, DTMF signals are added to the transmission frequency f and the resulting signal is transmitted toward the first radio station (step 116).

These process steps 117-120 for detecting reception at a first radio station are the same as steps 112-115 at a second radio station.

Thus, the call right confirmation method for the conventional radio communication apparatus is executed by using a digital identification code converted into a DTMF signal and a fixed timer for confirmation and at a predetermined fixed timing.

Therefore, in the conventional method of confirming the call right, the interval from the time when the first inspection is completed to the time when the continuous inspection is started is always fixed at a constant time. Thus, when multiple stations perform the function to check the coverage at the same time, the intervals for all stations are constant and the interference upon receipt of the identification code does not correctly recognize the identification code and thus the parties are actually in the coverage area. Despite being located, it causes the problem of recognizing that devices are out of range.

In addition, it is necessary to use a digital identification code to be converted into a DTMF signal to be added to a transmission frequency for transmission, which requires a circuit for converting the identification code into a DTMF signal, resulting in a problem of increasing device cost.

SUMMARY OF THE INVENTION The present invention seeks to solve the above-mentioned problems, and an object of the present invention is to provide a method for confirming a call right, which reduces device cost and reduces interference upon reception of codes.

The present invention checks the coverage right to transmit and receive an acknowledgment signal including an identification code between the first radio station and the second radio station at a predetermined timing (last time of the timer) to determine whether the first radio station and the second radio station are located within the coverage area. It provides a method of acknowledgment, wherein an identification code, i.e. one sound frequency selected from CTCSS (continuous sound coded Skeleton system) frequencies, is used so that the transmission of the acknowledgment signal at any optional timing arbitrarily set to an interval timer. To be performed.

When the switch for setting the function to confirm the coverage right is executed, the first station will set an interval timer at any optional set time and send a confirmation signal towards the second station after the set time has elapsed.

Upon receiving an acknowledgment signal from the first station, the second station will set an interval timer at any optional set time and transmit by returning an acknowledgment signal to the first station after the set time has elapsed.

At this time, the second radio station may be arranged to perform a confirmation indication upon receiving the confirmation signal.

In addition, the first radio station may be arranged to perform a confirmation indication upon receiving a return transmission of the confirmation signal from the second radio station.

In addition, when the first radio station receives a return transmission of the acknowledgment signal, it will reset the interval timer and resend the acknowledgment signal to the second radio station after the set time has elapsed.

At this time, when the second station receives the retransmission of the confirmation signal from the first station, it will continue to perform the confirmation indication.

When the first radio station does not receive the return transmission of the above-mentioned confirmation signal, it will replace the setting of the above-described interval timer with a predetermined fixed setting time.

When the second station does not receive a retransmission of the acknowledgment signal from the first station or the acknowledgment signal is not retransmitted, it will output a confirmation mark performance cancellation and / or beep.

1 is a timing chart illustrating a confirmation method of the present invention.

2 is a flowchart (part 1) showing the control flow of the confirmation method of the present invention.

3 is a flowchart (part 2) showing the control flow of the confirmation method of the present invention;

4 is a table showing values of CTCSS frequencies used in the present invention.

5 is a schematic diagram of a communication system to which the confirmation method of the present invention is applied.

6 is a schematic diagram of a communication system to which a conventional verification method is applied.

7 is a flowchart (part 1) showing the control flow of the conventional confirmation method.

8 is a flowchart (part 2) showing the control flow of the conventional confirmation method.

Preferred embodiments of the present invention will be described as follows with reference to the accompanying drawings.

First, in the present invention, as identification codes instead of DTMF signals based on conventional digital codes, the CTCSS frequency is adopted for use. The CTCSS frequency is also called the negative squelch frequency, which is assigned 38 waves between 67 Hz and 250.3 Hz according to international standards. 4 shows CTCSS numbers of corresponding frequencies that can be selected in the CTCSS configuration mode.

When this sound is carried on the transmission radio waves and communicates with a constant counterpart, this CTCSS frequency used is overlapped with the transmission transmission frequency.

Since the receiving party extracts audio signals by cutting off these CTCSS frequencies with a high pass filter or a band pass filter, these CTCSS frequencies will not affect the communication.

Fig. 5 schematically shows the configuration of a communication system used in the method for confirming the call right of the present invention. Unlike the conventional communication system shown in Fig. 6, each of the sound frequencies defined by the CTCSS numbers is assigned to the radio stations A to C as identification codes.

That is, as identification codes, CTCSS number 1 is assigned to the radio station A, number 15 is assigned to the radio station B, and number 1 is assigned to the radio station C. Thus, the station A and the station C can communicate with each other at the same communication frequency, but the station A and the station B open the differential squelch of the CTCSS numbers assigned to the stations A and B. You won't be able to communicate with each other. Since this CTCSS frequency is used as the identification code, there is no need to convert digital codes into analog codes as in the conventional case, thus eliminating the need for a conversion circuit, thereby lowering the device cost.

In addition, in the confirmation security of the present invention, a random timer is used as an interval timer for checking a call right. This can solve the problem of multiple radio stations checking the coverage right at the same time, allowing the intervals to correspond to each other, and the problem that the interference at the code reception does not allow accurate code detection.

In addition, since the method for confirming the currency right of the present invention has such a feature, this will be specifically referred to as a communication range detection system (CORDS) function.

1 is a timing chart showing an example of a method for confirming a call right as described in the present invention. Here, a method of confirming a call right between a first radio station and a second radio station is shown. At this timing A ₀ , the CORDS function of the first radio station is set to on. On the other hand, assume that the CORDS function of the second radio station is also set to on at a predetermined timing. After executing the CORDS function, the first radio station automatically sets the built-in interval timer for inspection and a predetermined time is set.

In the present invention, this interval timer is configured as a random timer and for example a predetermined time from 1 second to 30 seconds is automatically set randomly. Accordingly, at timing A ₁ when the randomly set time period T ₁₁ has elapsed, the first radio station transmits a transmission frequency f carried on the CTCSS signals allocated thereto to the second radio station.

If the second radio station receives a transmission frequency f that includes this CTCSS frequency, it will recognize that the first radio station is within coverage.

TABLE 1

Under these circumstances, the antenna mark ▽ _IN will be displayed on the LCD display.

In addition, at the same time, at timing B ₁ as in the first radio station, the built-in interval timer for checking itself is randomly set to a predetermined timing. In step (timing B ₂ ) when the set time period of T ₂₁ of this interval timer has elapsed, the transmission frequency f carried on the CTCSS signals will be returned to the first radio station.

When the first station detects a transmission frequency f containing CTCSS signals from the second station at timing A ₂ , the antenna indication is displayed on its LCD display and the interval timer for checking for successive rounds is randomly set. It is set at time T ₁₂ . In addition, in a step (timing A ₃ ) when the set time period T ₁₂ has elapsed, a transmission carrying CTCSS signals for the second radio station will be performed (result 1).

However, after a predetermined time has elapsed, if no confirmation signal is received from the second radio station, the second radio station is considered to be located outside the coverage area and the display of the antenna mark on the LCD display will be canceled (i.e., the antenna mark is Will turn off). In addition, the acknowledgment signal will be newly transmitted to the second station (result 2), but in this case, the set time of the interval timer is longer than a predetermined fixed time interval or random time period, e.g. 1 minute or 50 to It will be changed to 70 seconds. Since the other station that can frequently transmit the confirmation frequency at a shorter interval with a random timer is outside the coverage area, the detection probability for confirming whether the other party is in the coverage area is lower, which reduces the battery power associated with the transmission of the confirmation signals. Acts to lower. The operation of the second station depends on whether the first station receives an acknowledgment signal and when the acknowledgment signal is transmitted from the first station according to result 1, the indication of the antenna mark continues at timing B ₃ as before and the interval timer. The random timer is set to a predetermined random set time period T ₂₂ .

However, if the acknowledgment signal is not based on the result 2 described above, the reception cannot be detected and thus this party is considered out of coverage and the indication of the antenna will go out. In addition, a beep is generated to notify the user that the other party has moved out of the field of call.

The next procedure will repeat the above procedure unless the CORDS function is turned off.

2 and 3 show a flow chart for the timing chart described in FIG. 1 and have the same flow as the conventional flow chart shown in FIGS. 7 and 8. That is, each of steps 201-220 corresponds to steps 101-120.

The present invention differs from the conventional flow in that the interval timer for checking the coverage right is a random timer and the identification code is a CTCSS signal. In addition, the present invention is different in that the timer is set again when no confirmation signal from the opposite station is detected.

That is, this point referred to herein is that in steps 206, 210, 215 and 220 the interval timer is changed from an initial random timer to a fixed timer or a random timer with a longer time period.

When the set time of a fixed timer or a random timer having a longer time period is set to a longer time period than the maximum set time period of the initial random timer, and about 1 minute is considered appropriate, when the maximum set time period of the random timer is 30 seconds. do.

That is, in the case where the confirmation signal from the counterpart is not detected, the possibility that the counterpart is in the coverage area may be returned later at a random timing shorter than the time period set by the fixed timer or a random timer having a longer time period. Even so, there is a need to reduce battery power consumption due to frequent inspection operations.

So far, as described above based on these embodiments, the random timer is used as an interval timer for confirming the right to check for a test in a predetermined random time period, so that multiple stations are not checked in an overlapped manner and block reception of codes. This should not happen.

In addition, in the coverage area, the interval timer is continuously set as a random timer with a relatively short time period, but when the counterpart is outside the coverage area, a fixed timer or a random timer with a longer time period is switched on to save battery power consumption. Lower.

In addition, as the identification code, the CTCSS frequency can be used so that the identification code does not need to be converted into an analog signal and can reduce the manufacturing cost of the device.

Claims (9)

A method of confirming a coverage right by transmitting-receiving at a given timing a confirmation signal comprising an identification code between the first radio station and a second radio station to confirm whether a first radio station and the second radio station are located within a coverage area, the method comprising: As the identification code, one sound frequency selected from CTCSS frequencies is used, so that transmission of the confirmation signal is performed at any optional random timing set by an interval timer. The method of claim 1, When the switch for setting a function to confirm the call right is turned on, the first radio station sets the interval timer to an optional setting time to transmit the confirmation signal to the second radio station after the setting time has elapsed. How to check your currency. The method according to claim 1 or 2, And the second radio station receiving the confirmation signal sets the interval timer to an optional setting time and transmits the confirmation signal to the first radio station after the setting time has elapsed. The method of claim 3, And when the second radio station receives the confirmation signal, the second radio station performs a confirmation indication. The method of claim 3, And when the first radio station receives the return transmission of the confirmation signal, the first radio station performs a confirmation indication. The method of claim 3, And when the first radio station receives the return transmission of the confirmation signal, the first radio station resets the interval timer to retransmit the confirmation signal to the second radio station after the set time has elapsed. The method of claim 6, And when the second radio station receives the retransmission of the confirmation signal, the second radio station continuously performs the confirmation indication. The method of claim 3, When the first radio station does not receive any return transmission of the acknowledgment signal, the setting of the interval timer is replaced by a longer predetermined fixed or random set time period to return the acknowledgment signal towards the second radio station. How to check the right of coverage to prevent sending. The method according to claim 6 or 8, And when the second radio station does not receive any retransmission of the acknowledgment signal or when the acknowledgment signal does not retransmit, the confirmation indication is canceled and / or a beep sound is output.