KR100629439B1 - Method and mobile communication terminal for indicating received signal strength by using keypad light emitting diode - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying received signal strength using a keypad light emitting diode (keypad light emitting diode, hereinafter referred to as a 'keypad LED') and a mobile communication terminal.

The present invention provides a method of indicating a reception state of an RF signal in a mobile communication terminal performing a mobile communication service including a voice call service and a wireless data service, the method comprising the steps of: (a) receiving an RF signal; (b) generating a received signal strength indication (RSSI) value quantifying the characteristics of the RF signal; (c) searching a pre-stored color table to select a color corresponding to the RSSI value; And (d) provides a method for displaying the received signal strength using the keypad LED, characterized in that it comprises the step of displaying the color using the keypad LED.

According to the present invention, the user can easily check the radio wave reception state during a call by checking the color displayed on the keypad LED of the mobile communication terminal without the inconvenience of checking the antenna bar displayed on the liquid crystal display for the radio wave reception state of the mobile communication terminal. have.

Mobile terminal, received signal strength, call quality, antenna bar, keypad, RSSI

Description

Method for displaying received signal strength using keypad light emitting diode and method for mobile communication terminal

1 is a front view showing the appearance of a conventional mobile communication terminal,

2 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal displaying different colors on a keypad according to a received signal strength according to a preferred embodiment of the present invention;

3 is a flowchart illustrating a method of displaying different colors on a keypad LED according to a received signal strength according to a preferred embodiment of the present invention;

4 is a flowchart illustrating a detailed method of displaying different colors on a keypad LED according to a received signal strength according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100, 200: mobile communication terminal 110, 220: antenna

120: LCD screen 130: antenna bar

140, 224: keypad LED 202: memory section

204: key input unit 206: liquid crystal screen display unit

208: control unit 210: digital signal processing unit

212: bass band converter 214: speaker

216: microphone 218: RF signal processing unit

222: keypad LED control unit 224: keypad LED

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for displaying received signal strength using a keypad light emitting diode (keypad light emitting diode, hereinafter referred to as a 'keypad LED') and a mobile communication terminal. More specifically, in order to allow a user to easily grasp the reception state of a radio frequency (RF) signal of a mobile communication terminal, a received signal strength indication (RSSI: Received Signal) quantifying the size of an RF signal received through an antenna A strength indicator (hereinafter referred to as RSSI) relates to a method for displaying received signal strength using a keypad LED displaying various colors through keypad LEDs, and a mobile communication terminal.

Recently, with the development of wireless communication technology and electronic device technology, mobile communication technology has emerged, and mobile communication such as CDMA (Code Division Multiple Access) 2000 phone and IMT-2000 phone for performing wireless communication using mobile communication technology. The terminal has been developed.

The mobile subscriber can not only perform a voice call while moving by using the mobile communication terminal, but can also transmit and receive various types of information in the form of a text, an image, and the like. You can also use the service to connect to the internet in a wired environment and receive a variety of information.

1 is a front view showing the appearance of a typical mobile communication terminal.

The mobile communication terminal 100 is wirelessly connected to a mobile communication network providing a mobile communication service to perform a mobile communication service by transmitting and receiving a radio signal with a base station of a mobile communication network. At this time, the radio signal transmitted and received with the base station of the mobile communication network is an RF signal. The mobile communication terminal 100 includes an antenna 110 to transmit or receive an RF signal to or from the base station through the antenna 110.

On the other hand, the strength of the RF signal received by the mobile terminal 100 from the wireless base station is one of the major factors that determine the quality of the voice call. When the strength of the received RF signal decreases, the call quality is degraded, such as a voice call dropping or a noise.

Accordingly, the mobile communication terminal 100 determines whether or not a voice call can be performed or whether a good quality voice call can be performed according to the reception state of the RF signal, that is, the radio wave.

Most users using the mobile communication terminal 100 doubt the performance of the mobile communication terminal 100 when sound quality is degraded when making a voice call using the mobile communication terminal 100. However, as described above, the call quality depends more on the reception state of radio waves according to the wireless environment than the performance of the mobile communication terminal 100.

As shown in FIG. 1, a liquid crystal screen 120 is attached to a typical mobile communication terminal 100 so that the information output as the mobile communication terminal 100 performs various functions is displayed on the liquid crystal screen 120. .

In addition, in order to inform the user of the radio wave reception state of the mobile communication terminal 100, a graphic antenna bar 130 is displayed on a specific portion of the liquid crystal display 120 (usually in the upper left). The user checks the antenna bar 130 to check the radio wave reception state, and if the radio wave reception is weak or the radio wave reception is not at all, delay the call to resume the call attempt when the radio wave reception is stronger.

The conventional method of displaying a radio wave reception state using the antenna bar 130 indicates the received signal strength through the number of bars of the antenna bar 130. That is, the smaller the number of bars, the better the radio wave reception state, and the larger the number of bars, the better the radio wave reception state.

On the other hand, since the antenna bar 130 is displayed on the liquid crystal display 120, it is possible to check only when the liquid crystal display 120 is turned on. Therefore, in order to check the radio wave reception state of the mobile communication terminal 100, the user opens a folder in the case of a folder-type mobile communication terminal or opens a slide in the case of a slide-type mobile communication terminal. Further operations such as turning on the backlight 120 or pressing a specific button to turn on the backlight of the LCD screen 120 need to be performed.

In addition, even if the LCD screen 120 is turned on through the above-described procedure, the LCD screen 120 of the conventional mobile communication terminal 100 is designed to be turned on only for a predetermined time, not always turned on to reduce power consumption. There is a time when the antenna bar 130 can be confirmed.

In particular, when the user is using the mobile communication terminal 100 to make a voice call, the mobile communication terminal 100 may be used as long as the user does not use additional devices such as hands free and earphones. Since it is close to the face, it is difficult for a user to check the liquid crystal display 120.

Meanwhile, the conventional mobile communication terminal 100 attaches LEDs to the keypad as shown in FIG. 1, and displays various colors on the keypad LEDs 140 when a call is received, an alarm bell is played, or a video or music is played. It indicates that the mobile communication terminal 100 is performing a specific operation to indicate the appearance. These colors may be designed to be differently set by the user in some cases. In addition, the keypad LED 140 only displays the set color when in a call, and thus does not play a specific role, thereby decreasing utilization.

In order to solve this problem, the present invention, in order to allow the user to easily grasp the reception state of the RF signal of the mobile terminal, various colors keypad according to the RSSI value quantified the size of the RF signal received through the antenna It is an object of the present invention to provide a method for displaying received signal strength using a keypad LED displayed through an LED and a mobile communication terminal.

In order to achieve the above object, the present invention provides a method for indicating a reception state of an RF signal in a mobile communication terminal performing a mobile communication service including a voice call service and a wireless data service, the method comprising: (a) receiving an RF signal; step; (b) generating a Received Signal Strength Indication (RSSI) value that quantifies the characteristics of the RF signal; (c) searching a pre-stored color table to select a color corresponding to the RSSI value; And (d) provides a method for displaying the received signal strength using the keypad LED, characterized in that it comprises the step of displaying the color using the keypad LED.

In addition, according to another object of the present invention, an antenna for receiving and transmitting an RF (Radio Frequency) signal, connected to the antenna to demodulate and transmit the RF signal, the received signal strength indication (RSSI: Received Signal Strength) RF signal processing unit for generating and transmitting Indication, hereinafter referred to as 'RSSI' value, converts signals transmitted and received connected to the RF signal processing unit into baseband signals, and performs digital-to-analog conversion function and analog-to-digital conversion function. A baseband converter connected to the baseband converter, a digital signal processor configured to code or decode a voice signal, perform an equalizer function, and a sound data processing function, a memory unit that stores a plurality of software and a plurality of data, and overall operations. Control panel to control, keypad light-emitting diode attached to the keypad to emit various colors (Keypad LED: Light Emitting Diode (hereinafter referred to as 'keypad LED'), and displays a signal strength of the RF signal, the mobile terminal, storing the color table, and receives the RSSI value from the RF signal processing unit through the control unit, the color A mobile communication terminal displaying received signal strength by using a keypad LED, comprising: a keypad LED controller for searching a table to select a color corresponding to an RSSI value and controlling the keypad LED to emit a color; to provide.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal displaying received signal strength by using a keypad light emitting diode according to an exemplary embodiment of the present invention.

The mobile communication terminal 200 according to the preferred embodiment of the present invention includes a memory unit 202, a key input unit 204, a liquid crystal display 206, a control unit 208, a digital signal processor 210, a baseband conversion unit. 212, speaker 214, microphone 216, RF (Radio Frequency) signal processing unit 218, antenna 220, keypad light emitting diode (Keypad LED: Keypad Light Emitting Diode, hereinafter referred to as 'keypad LED') Control unit 222 and keypad LEDs 224.

The memory unit 202 drives the mobile communication terminal 200, performs voice call and data communication, and provides a mobile communication service including a plurality of software, voice call service, and wireless data service performing various additional functions. It stores protocol software that processes messages sent and received with the mobile communication network and data input from users.

To this end, the memory unit 202 may be an EEPROM (Electrically Erasable and Programmable Read Only Memory) that can modify the contents in a byte unit, which is a nonvolatile memory, or a flash memory that can modify the contents in a block unit. ) And SDRAM (Synchronous Dynamic Random Access Memory).

The key input unit 204 includes a numeric button for inputting a number such as a telephone number, a character button for inputting a character, and a menu selection button for selecting a menu. The liquid crystal display 206 displays an operation state of the mobile communication terminal 200 including a power supply state, a radio wave reception intensity, a date and time, and displays the information in a text form when the information is transmitted in a text form. Check the box to let the user identify the information they need.

The controller 208 controls the overall operation of the mobile communication terminal 200. In addition, the controller 208 may not only perform a voice call and data communication in accordance with a signal input from the key input unit 204 or the digital signal processor 210, but also perform a variety of additional functions. When various kinds of stored software are executed and data which is not executed immediately is inputted, the data is transmitted to the memory unit 202 and controlled to be stored.

The digital signal processor 210 is a digital signal processor that codes or decodes a voice signal, performs an equalizer function to remove multipath noise, and performs an acoustic data processing function. In addition, the digital signal processor 210 exchanges a voice signal with the baseband converter 212.

The baseband converter 212 converts a signal transmitted and received between the RF signal processor 218 and the digital signal processor 210, the speaker 214, and the microphone 216 into a baseband signal, and converts the digital-analog signal. And an analog-digital conversion process, and the speaker 214 outputs a voice signal output from the baseband converter 212 as an audible sound, and the microphone 216 electrically converts the voice input of the mobile subscriber. Convert to a signal.

In addition, the baseband converter 212 transmits a transmission signal to the RF signal processor 118, and controls the power of the RF signal processor 218 or automatically controls its gain. The RF signal processor 218 receives the received signal.

The RF signal processor 218 demodulates the RF signal received from the antenna 220, modulates and amplifies the transmission signal received from the baseband converter 112, and transmits the modulated signal to the antenna 220. In addition, the RF signal processor 218 measures the signal strength of the RF signal received from the antenna 220 to generate a received signal strength indicator (RSSI: RSSI ') value, thereby controlling the controller 208. It passes through the keypad LED control unit 222 through. Here, the RSSI value is obtained by converting the power of the RF signal into a numerical value and may be expressed in decibel units (dBm).

The antenna 220 receives a radio signal propagated from the air, transmits the radio signal to the RF signal processor 218, and transmits a transmission signal transmitted from the RF signal processor 218 to the air.

The keypad LED controller 222 controls the keypad LED 224 to emit various colors under the control of the controller 208. That is, the control signal received from the controller 208 is analyzed and controlled to emit light by applying a specific voltage to one or more LEDs among the plurality of LEDs of the keypad LED 224 according to the control signal.

The keypad LED controller 222 according to the preferred embodiment of the present invention stores a color table according to the RSSI value. When the keypad LED controller 222 receives the RSSI value from the RF signal processor 218 through the controller 208, the keypad LED controller 222 searches a stored color table to select a color corresponding to the received RSSI value, The LED is controlled to emit light by applying a specific voltage to the LED of the selected color among the plurality of LEDs.

In addition, when the keypad LED controller 222 receives the RSSI value, the keypad LED 224 of the corresponding color is turned on to check the state of the mobile communication terminal 200 and wait for a key input or perform a specific function. Determine whether or not the keypad LED (224) is lit. In addition, the keypad LED controller 222 compares the received RSSI values when the RSSI value is continuously received, and when the other RSSI values are received, searches the color table to select a color corresponding to the other RSSI values, and the keypad LED 224 of the selected color. ) Lights up. For this purpose, the keypad LED controller 222 includes a memory module for storing a color table, a memory module for storing RSSI values, and a computing module such as a microprocessor.

Table 1 shows a color table according to RSSI values.

Typically, the RSSI value of the RF signal received by the antenna 220 is -108 dBm to -20 dBm. And there is a difference in the call quality according to the RSSI value, according to the steps of the RSSI value shown in Table 1 in order, can be divided into impossible call, shadow, relatively good, good grade. That is, if the RSSI value is above about -90 dBm, then the area is an unreachable area, and if the RSSI value is between about -90 dBm to -80 dBm, the area is a radio shadow area, and the RSSI value is about -80 dBm. If it is between -70 dBm, the area is a relatively good area to talk, and if the RSSI value is about -70 dBm or less, the area is a very good area to talk.

Accordingly, the keypad LED control unit 222 selects the emission color of the keypad LED 224 according to this grade and controls the keypad LED 224 so that when the RSSI value is about −90 dBm or more, the red LED lights up to make a call impossible. If the RSSI value is between about -90 dBm and -80 dBm, the yellow LED lights up to indicate that it is a shade of radio waves.If the RSSI value is between -80 dBm and -70 dBm, the blue LED lights up to receive radio waves. This indicates that the region is relatively good, and if the RSSI value is about -70 dBm or less, it indicates that the radio reception is very good and that the region is suitable for making a call.

The keypad LED 224 is composed of a plurality of LEDs and is typically attached to the bottom above the key input 204. The preferred keypad LED 224 of the present invention is composed of a plurality of LEDs including a red LED, a yellow LED, a light blue LED, and a blue LED, and lights up a plurality of LEDs under the control of the keypad LED controller 222.

3 is a flowchart illustrating a method of displaying received signal strength by using a keypad LED according to a preferred embodiment of the present invention.

When power is applied, the mobile communication terminal 200 detects an RF signal from the air through the antenna 220 and receives it (S310).

The mobile communication terminal 200 receiving the RF signal uses the RF signal processing unit 218 through the magnitude of the RF signal, the noise component mixed with the RF signal, that is, the interference signal, the interference signal caused by surrounding electronic communication devices, and the reflection. By comprehensively analyzing whether the distortion signal generated by the transmission is mixed with the pure RF signal, an RSSI value indicating the received signal strength is generated (S320).

The mobile communication terminal 200 generating the RSSI value searches the color table according to the RSSI value using the keypad LED controller 222, selects a color corresponding to the RSSI value (S330), and displays the keypad LED of the selected color. 224 to turn on (S340).

That is, for example, if the RSSI value generated by the RF signal processing unit 218 of the mobile communication terminal 200 is -75 dBm, the keypad LED control unit 222 receiving the value is-in the color table shown in Table 1-. Select the light blue corresponding to -80 dBm to-70 dBm to which 75 dBm belongs, and turn on the light blue keypad LED.

4 is a flowchart illustrating a detailed method for displaying received signal strength using keypad LEDs according to an exemplary embodiment of the present invention.

3 illustrates a method of generating an RSSI value for an RF signal received by the mobile communication terminal 200 and lighting an LED of a color corresponding to the RSSI value, the mobile communication terminal 200 is carried by a user. As a portable device, power is not supplied from the outside while being portable, and operation power is supplied from a battery mounted therein.

The power supplied from the battery cannot be infinite, and the battery is discharged and charged after being supplied for a predetermined time. Therefore, the time for which the mobile communication terminal 200 can be used while carrying is dependent on the power supply time of the battery, so the efficient use of the power source is very important.

Therefore, as described with reference to FIG. 3, if the keypad LED 224 is turned on while receiving the RF signal while power is supplied to the mobile communication terminal 200, battery consumption is severe and the use of the mobile communication terminal 200 is severe. The possible time will be very short.

To this end, in the present invention, the mobile communication terminal 200 determines the current state and determines whether the keypad LED 224 is turned on.

In step S330 of FIG. 3, the mobile communication terminal 200 that has selected a color corresponding to the RSSI value is displayed as a folder or folder even before the keypad LED 224 is turned on or after the keypad LED 224 is turned on as in step S340. A slide is opened to determine whether a user is waiting for a key input from a user or executing a specific software such as a voice call, a message transmission, or a phone book (S410).

The mobile communication terminal 200 turns on the keypad LED 224 of the selected color when it is in the current operating state, such as waiting for a key input from the user or performing a specific function as a result of checking in step S410 (S420).

As a result of checking in step S410, the mobile communication terminal 200 is not waiting for a key input from a user, and is not performing a specific function. Check (S412).

The user may select the always-on mode to turn on the keypad LED 224 even when the battery is exhausted and the mobile communication terminal 200 does not operate at all. When a user is in an area that is generally recognized as a radio shadow area, such as a basement, a building, a valley, etc., the user is very curious about whether the mobile communication terminal 200 can receive and make a call by receiving a radio wave.

At this time, the user selects the always-on mode so that the mobile communication terminal 200 does not operate at all (for example, even when the folder or the slide is closed), but the received signal to the keypad LED 224 exposed to the outside. Easily check the radio wave reception state of the mobile communication terminal 200 without the troublesome procedure such as checking the antenna bar output on the liquid crystal display 206 by opening a folder or slide of the mobile communication terminal 200 by displaying the color according to the intensity. It may be.

As a result of checking in step S412, the mobile communication terminal 200 proceeds to step S420 to light the keypad LED 224 of the selected color when the always on mode is activated, and when the always on mode is not activated, the keypad LED ( Without turning on 224, the next time the operation starts or the always-on mode is activated, the colored keypad LED 224 corresponding to the RSSI value lights up.

Meanwhile, the mobile communication terminal 200 continuously receives the RF signal not only once through the antenna 220. That is, the mobile terminal 200 not only performs mobile communication services such as voice call service, wireless data service, short message service, etc., but also periodically transmits and receives RF signals with the base station in idle mode. Location registration is performed in the communication network, and whether there is a paging request from the mobile communication network. Therefore, the mobile communication terminal 200 receives the RF signal through the antenna 220 at regular time intervals.

In addition, since the location of the mobile communication terminal 200 is not fixed and its location changes with movement, the distance from the base station, the surrounding environment, the wireless environment, etc. are frequently changed, and the characteristics of the received RF signal are also frequently changed. As a result, the mobile communication terminal 200 generates an RSSI value for the received RF signal every time the RF signal is received or at a predetermined period, and the generated RSSI value is controlled by the keypad LED controller 222 through the controller 208. Is delivered to.

Therefore, in order to display the received signal strength of the RF signal that is continuously received, the mobile communication terminal 200 that lights up the keypad LED 224 of the color selected in step S420 is newly generated every time the RF signal is received or at a predetermined cycle. The RSSI value is compared with the previous RSSI value to determine whether the new RSSI value and the old RSSI value are the same (S430).

If the new RSSI value and the previous RSSI value are the same as the result of checking in step S430, the mobile communication terminal 200 maintains lighting of the keypad LED 224 which is lit in step S420, and the new RSSI value and the previous RSSI value are not the same. If it is determined that the received signal strength has been changed, the color table of the keypad LED controller 222 is checked to select a new color corresponding to the new RSSI value (S440), and the keypad LED 224 of the selected new color is turned on ( S450).

The mobile communication terminal 200 which lights up the keypad LED 224 of the new color selected in step S450 proceeds to step S410 and repeats the procedures of steps S410 to S450, but the operation is stopped or the procedure is not always turned on. To exit.

In this manner, the mobile communication terminal 200 displays keypad LEDs in different colors according to the received signal strength of the RF signal, in addition to using a display device such as the liquid crystal display 206. You can tell.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, the user can easily propagate during a call by checking the color displayed on the keypad LED of the mobile communication terminal without the inconvenience of having to check the antenna bar displayed on the LCD screen for the radio reception state of the mobile communication terminal. You can check the reception status.

In addition, it is possible to easily determine the current radio wave reception state by checking only the color displayed on the keypad LED without turning on the back light of the liquid crystal screen of the mobile communication terminal when there is an area where a call or service is not available or a radio wave shadow area.

Claims (16)

A method for displaying a reception state of an RF signal in a mobile communication terminal performing a mobile communication service including a voice call service and a wireless data service, the method comprising: (a) receiving the RF signal; (b) generating a received signal strength indication (RSSI) value quantifying the characteristics of the RF signal; (c) searching a pre-stored color table and selecting a color corresponding to the RSSI value; And (d) displaying the color using a keypad LED. Method for displaying the received signal strength using the keypad LED, characterized in that it comprises a. The method of claim 1, wherein the method is After step (d) above, (e) checking a state of the mobile communication terminal to determine whether the mobile communication terminal is performing a specific function; (f) checking whether the "always on mode" is activated when the mobile communication terminal is not performing the specific function as a result of the checking in step (e); And (g) maintaining the state of the keypad LED if the "always on mode" is not activated as a result of checking in step (f); Method for displaying the received signal strength using the keypad LED, characterized in that it further comprises. The method of claim 2, wherein the method is After the step (f), (f1) performing the step (d) when the mobile communication terminal is performing the specific function as a result of the checking in the step (e). Method for displaying the received signal strength using the keypad LED, characterized in that it further comprises. The method of claim 2, wherein the method is After step (g), (h) performing the step (d) if the "always on mode" is activated as a result of the checking in the step (f); Method for displaying the received signal strength using the keypad LED, characterized in that it further comprises. The method of claim 1, wherein the method is After step (d) above, (i) checking whether a new RSSI value is received; (j) if the new RSSI value is received as a result of the checking in step (i), comparing the RSSI value with the new RSSI value to determine whether the same; And (k) if the RSSI value and the new RSSI value are not the same as the result of the checking in step (j), search the color table to select a new color corresponding to the new RSSI value, and select the new color. Steps to Display Using Keypad LEDs Method for displaying the received signal strength using the keypad LED, characterized in that it further comprises. The method of claim 5, wherein the method is After step (k) above, (l) repeating steps (i) to (k) Method for displaying the received signal strength using the keypad LED, characterized in that it further comprises. The method of claim 5, wherein the method is After step (k) above, (m) maintaining the state of the keypad LED when the RSSI value and the new RSSI value are the same as a result of the checking in step (j); Method for displaying the received signal strength using the keypad LED, characterized in that it further comprises. The method of claim 5, wherein the method is After step (j) above, (j1) maintaining the state of the keypad LED when the new RSSI value is not received as a result of the checking in step (i); Method for displaying the received signal strength using the keypad LED, characterized in that it further comprises. An antenna for receiving and transmitting a radio frequency (RF) signal, connected to the antenna to demodulate and transmit the RF signal, and to display a received signal strength indication (RSSI) using the RF signal. RF signal processing unit for generating and transmitting a value, a baseband conversion unit for converting a signal transmitted and received connected to the RF signal processing unit into a baseband signal, performing a digital-to-analog conversion function and an analog-to-digital conversion function, A digital signal processor for coding or decoding a voice signal, performing an equalizer function, and a sound data processing function connected to the baseband converter, a memory unit storing a plurality of software and a plurality of data, a controller for controlling overall operations, and a keypad. Keypad LED: Light Emitting Diod e), hereinafter referred to as 'keypad LED', the mobile communication terminal to display the received signal strength of the RF signal, Storing a color table and receiving the RSSI value from the RF signal processor through the control unit, searching the color table to select a color corresponding to the RSSI value, and controlling the keypad LED to emit the color Keypad LED controller A mobile communication terminal for displaying the received signal strength by using the keypad LED, comprising a. The method of claim 9, wherein the color table, A mobile communication terminal for displaying a received signal strength by using a keypad LED, the range of which the RSSI value can be generated according to the RF signal is divided into a plurality of classes, and a color corresponding to each of the classes. . The method of claim 10, wherein the rating is, A mobile communication terminal for displaying received signal strength by using a keypad LED, characterized in that the class to distinguish one or more of the call quality state of the call impossible, radio wave shading, relatively good and good. The method of claim 11, wherein the rating is, If the RSSI value is greater than or equal to -90 dBm, the call is impossible. If the RSSI value is between -90 dBm and -80 dBm, it is radio shading, and if the RSSI value is between -80 dBm and -70 dBm, Preferably, when the RSSI value is -70 dBm or less, the mobile communication terminal displaying received signal strength by using the keypad LED, characterized in that it is classified as good. The method of claim 11, wherein the color is, Red for the call quality status of the non-callable, yellow for the call quality status of the radio wave shade, and blue for the rating for the relatively good call quality. The mobile communication terminal displaying the received signal strength by using the keypad LED, characterized in that the case of the class to distinguish the call quality state of the blue. The method of claim 9, wherein the keypad LED control unit, The mobile communication terminal displaying the received signal strength by using the keypad LED, when the specific function is not being performed in the mobile communication terminal, and the always-on mode is not activated, the keypad LED is maintained. The method of claim 14, wherein the keypad LED control unit, When the specific function is performed in the mobile communication terminal or the always-on mode is activated while maintaining the state of the keypad LED, the keypad displays the color through the keypad LED. Mobile terminal displaying strength. The method of claim 9, wherein the keypad LED control unit, Storing the RSSI value, and when receiving a new RSSI value from the RF signal processor, stores the new RSSI value, compares the RSSI value with the new RSSI value, and confirms whether the RSSI value is the same; If the RSSI value is not the same, the received signal strength is displayed using the keypad LED, wherein the color table is searched to select a new color corresponding to the new RSSI value and the new color is displayed through the keypad LED. Mobile communication terminal.

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