KR950012596B1 - A wireless phone - Google Patents

Abstract

detecting whether a battery of a portable device is at a low voltage state during the portable device communicates with a counterpart and transmitting a warning sound; checking whether a user of a radio telephone manipulates a key for exchanging the battery at the low voltage state; and transferring a state of the radio telephone into a communication stand-by state for providing an exchange time of the battery in response to the key manipulation and if the battery is exchanged within a predetermined time, transferring the communication stand-by state into a communication state to maintain the communication state with the counterpart.

Description

How to perform a call on a cordless phone that can talk continuously even when changing batteries

1 is a block diagram of a portable device of a typical wireless telephone.

2 is a block diagram of a fixing device.

3 is a signal flow diagram between a fixed and a portable device according to the present invention.

4 is a call control procedure of a portable device according to an embodiment of the present invention.

5 is a call control procedure of the fixing device according to an embodiment of the present invention.

The present invention relates to a communication system comprising a device connected to a telephone network (hereinafter referred to as a fixed device) and a device for making or receiving a call while carrying a user (hereinafter referred to as a portable device). The present invention relates to a method for performing a call of a wireless telephone capable of making a continuous call without blocking a call.

Typically, portable and fixed devices of well-known cordless telephones are shown in FIGS. 1 and 2.

Referring to FIG. 1, a portable device that a user makes or receives a wireless call within a limited space range includes an RF module 12 including a transmission / reception device for receiving signals (voice and data), and an analog signal input. Keys that the user presses to perform a function, a modem (11), a memory (EEPROM) 13 that stores an ID code of the mobile device, and a digital signal, an analog signal, and a digital signal. The arranged keypad 14, the battery 15 for supplying power to the portable device, the low voltage detection circuit 16 for detecting a low battery state according to the consumption of the battery, and a user's voice are inputted. A microphone (MIC: 19) for converting and outputting a voice signal, a speaker (18) for transmitting an audio signal as an audible voice, a buzzer (17) for sounding an alarm when performing the state and function of a portable device, and a built-in program To control each of the above clocks No. consists cheoreo central device 10 to perform processing.

2, a fixed device connected to a telephone line includes an RF module 42, a modem 41, a memory (EEPROM) 43, and a central processing unit performing almost the same functions as the block of the portable device. The apparatus 40 includes a speech IC 44 for transmitting and receiving a voice signal through a telephone line, and a melody IC 45 for generating a melody sound.

In the radiotelephone having a high storage value and the portable device disclosed in Figs. 1 and 2, the operation of the prior art is described. The battery 15 mounted on the portable device while the high and low device is kept in a call state is described. The low voltage detection circuit 16 provides a signal indicating the low voltage state to the central processing unit 10 through the line 26 when the call is not used for a long time. Therefore, the CPU 10 outputs a pulse signal through the line 37 so that the alarm sound sounds at the buzzer 17.

At this time, the user should recognize that the battery life is short, and end the call quickly and replace the installed battery with a new battery to try again or wait for an incoming call. Here, if the call does not end within a predetermined time, the portable device automatically becomes inoperable. Therefore, the call of the call is blocked and terminated.

As described in the above description of the prior art, the conventional method has an inconvenient disadvantage that the call must be terminated within a certain time when the low voltage state occurs during the call. In addition, since a call is blocked after a certain time, there is a problem that the user cannot make a sufficient call for a desired time.

Therefore, an object of the present invention is to provide a method for performing a call that can solve the above-mentioned conventional problems.

Another object of the present invention is to provide a method for performing a call of a wireless telephone capable of exchanging batteries without blocking a call even during a call.

It is still another object of the present invention to make a continuous call in a connected state (telephone state) between two devices (fixed device and portable device) to increase call achievement and ease of use.

According to the present invention for achieving the above objects, when the portable device is in a call with the other party, detecting the state of the battery low voltage state in the portable device and sending an alarm; Checking whether a user of the wireless telephone operates a key for replacing a battery after the alarm is issued; Transitioning to a call waiting state in order to provide a replacement time of the battery in response to the operation of the key, and if the battery is replaced within a predetermined time, transitioning back to a call state to maintain a call with the counterpart. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details will be set forth in order to provide a thorough understanding of the present invention. For those skilled in the art, the above description will be apparent and will be fully practiced without these details. In addition, well-known circuits and their functions are descriptive in order not to obscure the present invention.

First, the device block of the radiotelephone applied to the present invention is the same as that of the first and second configurations described above. Line 20 of the modem 11, which is not described in the configuration diagram of FIG. 1, is an output line of digital data, and line 21 is an input line of the digital data. Line 22 is the analog input line of modem 11 and line 23 is the analog output line. The line 24 of the central processing unit 10 is the control bus line of the phase synchronizing circuit section in the RF module, and the line 25 is the measurement signal line for the received strength of the signal. Line 26 is a low voltage status line of the battery 15 and line 27 is a control bus line for reading or storing data (unique number) stored in the memory 13 and lines 28-33 are keypads. A scanning line for detecting the key input of (14), and lines 34-36 are input lines for inputting the detected key input. In addition, the line 37 is a pulse output line for driving the buzzer 17.

Unexplained lines 50 and 51 in the configuration description of FIG. 2 are output and input lines of digital data of modem 41 respectively. Lines 52 and 53 are analog input and output lines of the modem 41, respectively. Line 54 is a control bus line of the phase synchronizing circuit section in the RF module 42, and line 55 is a reception intensity measurement signal output line. Line 56 is a control bus line for reading and storing data (unique number) stored in the memory 43, lines 57 and 58 are voice signal input / output lines, and line 59 blocks and conducts voice signals. Line 60 is a control output line for driving and stopping the melody IC 45 to send and stop the melody, and line 61 is an output line for sending melody music.

In the embodiment of the present invention, the central processing unit 10 of FIG. 4 performs the control procedure of FIG. 4 sequentially, and the central processing unit 40 of FIG. 2 performs the control procedure of FIG. In this case (at the time of detecting the low voltage), the signal control flow between the portable device and the fixed device is shown in FIG.

Referring to FIG. 3, when the voltage of the battery is lower than the preset voltage, the central processing unit 10 of the portable device communicates wirelessly with the central processing unit 40 of the fixed device. Reference numerals 1-16 described in FIG. 3 are described as a procedure of corresponding numbers for convenience. First, in step 1, when a low voltage is detected due to the consumption of the battery during the call between the fixed device and the portable device, the mode is switched to the low voltage call state. Accordingly, the low voltage alarm sounds by the buzzer 17 (step 2). At this time, when the user presses the 'MOH (Music On Hold)' key on the keypad 14 (step 3), the portable device sends a 'HOLD MUSIC ON' message to the fixed device (step 4). When receiving the above message, the fixing device transmits a response message 'ID + ACK' to the portable device (step 5), and sends a melody to the CO line (step 6). When the 'TALK' key of the keypad 14 is pressed in step 7 in the above state, the portable device sends a 'ENDI' message to the fixed device and enters the standby state (step 8). In this state, the user of the portable device inserts a new battery within a preset time, here 5 seconds (step 9). With respect to step 9, the fixing device waits 5 seconds in step 6 (step 9 of the fixing device) and sends a 'RE ENGAGE'-message to the portable device (step 10). The portable device sounds an alarm upon receiving the message (step 11). In step 11, when the 'TALK' key of the portable device is pressed (step 12), and the message 'LINE ON' is sent to the fixed device (step 13), the fixed device sends an ID + ACK message corresponding to the response message. Stop the melody being sent to the CO line (14). The portable device enters a call state upon receiving an ID + ACK 'message from the fixed device (step 15). After the processes 14 and 15 are completed, the portable device and the fixed device are converted to the call state again in step 16 to continue the call. It can be seen that the signal flow of FIG. 3 is generated by the control procedures of FIGS. 4 and 5.

4 is a control procedure performed by the central processing unit 10 of the portable apparatus, and is actually achieved by a program list in which the flowchart of FIG. 4 is programmed as a programming language. Of course, the programming language can be implemented as a C-language, which is currently a high level language that is simple and easy to modify. 5 is a control flow chart performed by the central processing unit 40 of the fixing apparatus, which may be the same as the implementation of FIG. The programmed list is stored in a memory element such as a ROM in the central processing unit 10,40.

4 is a control flowchart of a portable apparatus for carrying out the present invention, which includes steps 401-437. The portable device interlocks with the fixed device and checks whether the call is in operation 401. If the mobile device is in a call state, the mobile device performs steps 402 to 420. Do this.

First, the processes of the call state will be described. When the user presses a key arranged on the keypad 14 of FIG. 1, the central processing unit 10 puts any one of the output lines 28-33 into a logical '1' state, and the remaining lines are '0' states. Outputs a signal. After that, the next line in the '1' state is set to the '1' state, and all remaining lines are set to the '0' state. In other words, this corresponds to an operation of sequentially scanning the keys. The device 10 also scans the state of the logic via lines 34, 35 and 36 to detect the type of key pressed. It can be seen that the above operation corresponds to step 402. After performing step 402, the process checks whether a key is pressed in step 403, and performs step 404 if it exists, and performs step 417 if it does not. If it is determined whether the key pressed in step 404 is a 'MOH' key, step 405 is performed. Step 405 is a process of comparing whether 'Send _ MOH _ Flag' is '1'. In step 405, if the value is not '1', the flag value is set to 1 (step 406), and a 'Hold Music On' message is sent to the fixed device through the RF module 12. If the 'Sand_ MOH_ Flag' value stored in the memory area such as RAM in step 405 is '1', that is, if the previous state is 'Hold Music On' message is transmitted and the melody is transmitted from the fixed device to the trunk line, Step 408 is performed to convert the value of 'Se nd_MOH_Flag' to '0', and the 'Mold Off' message is sent to the fixing device so that the fixing device stops transmitting the melody transmitted to the trunk line (process 409). ). If it is not the 'MOH' key in step 404, it is determined whether it is 'TALK' in step 410. In step 410, if the 'TALK' key is used, the state of the battery state of the portable device is checked by checking the state of the line 26. If the value is '0' (ie, the low voltage state), the 'ENDI' message is sent to the fixed device. In step 412, the RF module 12 transmits the signal through the RF module 12 (step 412), converts the 'Send_MOH_Flag' value to '0' (step 413), and terminates the call state (step 414).

At this time, the user replaces the battery of the portable device with a new battery. If it is not the 'TALK' key in step 410, other key processing is performed (414; irrelevant to the present invention). If the battery of the portable device is not in a low voltage state in step 411, the 'END' message is sent to the fixing device and fixed. The call with the device is completely terminated (step 416). In this case, you can see that you cannot continue the call even if you replace the battery.

On the other hand, if there is no key pressed in step 403, an analog signal applied through the RF module 12 is received as digital data through the line 20 (step 417), and the received message is an ID + ACK. In step 418, the message is determined (step 418). If the message is 'ID + ACK', the message sent is stopped (step 419). Step 420 is a process of processing another message unless the message is 'ID + ACK', and is far from the present invention.

If the standby state is the result of step 401, the data value of the new channel number is transmitted to the RF module 12 through the bus line 24 and newly locked (step 421), and the RF module including the receiver ( In step 12, the signal strength received through the line 25 is checked to determine a busy or free state (step 422). If the received signal strength is less than the reference signal strength in step 422, the free signal is increased, thereby increasing the channel number '1' (step 427), and performing step 421 again. In step 422, if the received signal strength is greater than the reference signal strength, it is in a busy state. Therefore, data is received through the RF module 12 and the modem 11 (step 423), and a received ID code and a memory (EEPROM) of the received data ( 13) compare the ID codes stored in step 13) (step 424). If it does not match in step 424, steps 427 and 421 are performed. In addition, if the ID code matches in step 424, it is determined whether the received data is a 'RE Engage' message (step 425). In step 425, if the message is not a 'Re engage' message, a corresponding message processing process is performed (step 426; the distance from the present invention is stopped). If the message is a 'Re Engage' message, the portable device is in the state of line 37. By converting the buzzer 17 is driven (step 428). Thereafter, the CPU 10 of the portable apparatus scans the keypad 14 to input key data (step 429) and checks whether the 'TALK' key is pressed in step 430. If it is not the 'TALK' key, the corresponding key processing is performed (step 437).

If it is determined in step 430 that the key is 'TALK', the message 'Line On' is transmitted to the fixed device through the modem 11 and the RF module 12 (step 431). Data is received through the RF module 12 and the modem 11 (step 432), and the received ID code and the stored ID code are compared in step 433. If it does not match in the above process, the data reception process is repeatedly performed. If it matches, it is checked in step 4354 whether the ID + ACK 'message is received. When the 1D + ACK 'message is received, transmission of the message is stopped (step 435), and the conversation is maintained with the other party located on the trunk line (step 436) by maintaining a call state with the fixed device.

5 is a control flowchart of the fixed device for achieving a call of the call at low voltage in conjunction with the fourth diagram. First, in step 501, it is determined whether the call is in a call state. Irrespective of the invention), if the call state is received through the RF module 42 and the modem 41 (step 502), it is determined whether the received data is a 'Hold Music On' message (step 503). . In step 503, if 'yes', the 'ID + ACK' message is sent to the portable device through the modem 41 and the RF module 42 (step 504), and the line 59 is a logic '0'. The voice signal of the speech IC 44 is interrupted, and the melody IC 45 is driven by setting the line 60 to '1' to transmit the melody to the CO line (telephone line) (step 505). On the other hand, if NO in step 503, it is determined whether the message is 'ENDI' (step 506). In step 506, if the message is not an 'ENDI' message, another processing corresponding to the message is performed (step 510). If the 'ENDI' message is set, the RAM value of "Timer A" is set to about 5 seconds and the 5 seconds have elapsed. Waiting for the process (steps 507 and 508), where the setting of the timer is typically set by a built-in timer and can also be done programmatically. The 5 second time period takes into account the time taken by the user to replace the battery and may be further extended. In practice, the replacement time of the battery in this embodiment is up to 15 seconds, which will be described below. If 5 seconds is found in step 508, the mobile device sends a 'Re Engage' message to the mobile device (step 509). After performing step 509, 10 seconds is set in the RAM value of the Timer-A (step 510), and data is received through the RF module 42 and the modem 41 (step 511). It checks whether the data is a 'Line On' message (step 512). If it is 'NO', it checks whether 10 seconds have elapsed (step 516). The call is transferred from the call state to the standby state (step 517).

In other words, the loop state of the trunk line is released and the normal standby state of stopping the melody transmission is made. If the 'Line On' message is received in step 512, the mobile device sends an 'ID + ACK' message (step 513), stops the melody transmitted to the trunk line (step 515), and reconnects with the mobile device. The communication state is maintained so that the call can be made with the other party of the telephone line of the mobile device (step 515).

The above description is summarized as follows.

When the 'MOH (Music On Hold)' key of the portable device is pressed in the state of low voltage communication between the fixed device and the portable device, the 'Hold Music On' message is sent to the fixed device, and the fixed device sends the melody to the trunk line. When the mobile device presses the Talk key (TALK key), the mobile device sends a 'ENDI' message to the fixed device and enters the standby state.

In the standby state, the battery of the portable device is replaced within a maximum of 15 seconds, and in this state, the fixed device sends an 'ENDI' message and enters the standby state.

In the standby state, the battery of the portable device is changed within a maximum of 15 seconds, and in this state, the fixed device waits for 5 seconds after receiving the 'ENDI' message and sends a 'Rangage' message to the portable device for up to 10 seconds. Drives a buzzer to sound an alarm. When the mobile device presses the TALK key, the mobile device sends a 'Line On' message to stop the melody transmission to the CO line of the fixed device, and the fixed device and the CO line of the mobile device maintain the call state again. It can be seen that the processing method to make a call continuously without blocking the call.

The effect of the present invention is that the battery can be exchanged in a low voltage busy state without interrupting the call to continue the call for a desired time.

According to the present invention as described above, it is possible to increase the user's ease of use, as well as to improve the achievement rate of the call even at low voltage.

As described above, the present invention has been illustrated and described with reference to the drawings, but the present invention is not limited thereto, and various changes and modifications can be made without departing from the basic definition of the present invention. Anyone who has knowledge of will clearly know.

Claims (2)

A method of controlling a call of a wireless telephone having a fixed device and at least one portable device, so that the battery can be exchanged without disconnecting the call while the call is being carried out, the method comprising: a battery in the portable device when the portable device is talking to the other party. Detecting whether a low voltage condition is generated and sending an alarm; Checking whether a user of the wireless telephone has operated a key for replacing a battery after the alarm is issued; Transitioning to a call waiting state to provide a replacement time of the battery in response to the operation of the key, and if the battery is replaced within a predetermined time, transitioning back to a call state to maintain a call with the counterpart; Call control method. The method of claim 1, wherein the time set from the call waiting state to the call maintaining state is about 15 seconds.