KR100723683B1 - Multi-band multi-mode wireless device, and power control method of the same - Google Patents

Abstract

The present invention relates to a method for controlling transmit and transmit power of a slave modem during handover, and to a multi-band-multimode (MB-MM) mobile communication terminal performing the method. According to a preferred embodiment of the present invention, a multi-band-multimode (MB-MM) mobile communication terminal in which any one of a plurality of modems provided is selectively operated, comprising: a slave modem performing communication in a first communication method; And a master modem for performing communication in a second communication method, transferring communication authority to the slave modem at the time of handover, and controlling transmission power of the slave modem until the handover is completed. There is provided a multi-band multi-mode (MB-MM) mobile communication terminal. According to the present invention, there is an effect that the master modem can control the transmission power of the slave modem during handover in a multi-band-multimode (MB-MM) mobile communication terminal.

Handover, Automatic Gain Control (AGC), High Frequency Power Calibration

Description

Transmission power control method of multiband multimode mobile communication terminal and multiband multimode mobile communication terminal {MULTI-BAND MULTI-MODE WIRELESS DEVICE, AND POWER CONTROL METHOD OF THE SAME}

1 is a diagram schematically illustrating a mobile communication network for providing a WCDMA service in a communication environment in which a CDMA network is basically constructed.

        2 is a block diagram of a conventional multi-band multi-mode (MB-MM) mobile communication terminal.

3 is a block diagram of a multi-band multi-mode (MB-MM) mobile communication terminal according to an embodiment of the present invention.

4 is a flowchart illustrating a process of storing high frequency power correction data of a slave modem in a master storage unit according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a process in which a master modem controls the transmission power of a slave modem during handover according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: existing CDMA service network

110-1, 110-2, 110-3: overlay area

120-1, 120-2: Multiband-Multimode (MB-MM) Mobile Communication Terminal

270, 370: antenna

260, 380: duplexer

210, 310: slave modem

220, 320: master modem

230, 350: slave storage unit

240, 360: master storage unit

The present invention relates to a multi-band-multimode (MB-MM) mobile communication terminal equipped with a plurality of modems, and in particular, a method for controlling the transmission power of a slave modem during handover and a method for performing the method. The present invention relates to a band multimode terminal.

The mobile communication terminal is a portable device implemented to enable a voice call with a counterpart located at a remote location while moving. Initially, only a voice communication was possible, but a mobile communication terminal has evolved to enable a data communication method using text and symbols and a multimedia communication method including a video signal.

In general, a code division multiple access (hereinafter referred to as "CDMA") mobile communication system may be suitable because audio and data have relatively smaller data capacity than a video signal, but in a multimedia communication method including a video signal, Due to the large amount of data, a mobile communication system having a high data transfer rate is required. A system suitable for such a requirement is a third generation (3GPP) mobile communication system, and an example is a broadband code division multiple access (hereinafter, referred to as WCDMA) type mobile communication system.

In addition, the mobile communication terminal may be classified in various ways according to the network access method. That is, a portable terminal for voice and data communication by connecting to a CDMA mobile communication system, a portable terminal for multimedia communication by connecting to a WCDMA mobile communication system, and a multi terminal that accepts and selectively connects and communicates with both CDMA and WCDMA methods. Band-multi-mode terminals (hereinafter referred to as MB-MM terminals).

1 is a diagram schematically illustrating a mobile communication network for providing a WCDMA service in a communication environment in which a CDMA network is basically constructed.

As shown in FIG. 1, services of the CDMA scheme are currently provided in a wide area 100. In contrast, WCDMA type services are provided only in a relatively narrow area. That is, the WCDMA service is provided only in some regions 110-1, 110-2, and 110-3 within the CDMA service region, and some regions and the WCDMA service region in the CDMA service region are overlapped regions (hereinafter, 'Overlay areas 110-1, 110-2, and 110-3' may be formed. Of course, it is obvious that the WCDMA service area may exist independently in an area other than the CDMA service area.

In the overlay regions 110-1, 110-2, and 110-3, a CDMA network, a second generation mobile communication network, and a WCDMA network, a third generation mobile communication network coexist. Therefore, in order to be able to selectively use the CDMA type service and the WCDMA type service in the overlay regions 110-1, 110-2, and 110-3, the multiband-multimode (MB-MM) mobile communication terminal (120-1, 120-2).

2 is a diagram schematically illustrating a configuration of a conventional multi-band multi-mode (MB-MM) mobile communication terminal.

Referring to FIG. 2, the conventional multi-band-multimode (MB-MM) mobile communication terminal 200 includes a slave modem 210, a master modem 220, a slave storage unit 230, and a master storage unit 240. , A slave amplifier 250-1, a master amplifier 250-2, a duplexer 260, and an antenna 270. As shown, the multi-band multi-mode (MB-MM) mobile communication terminal 200 is provided with a plurality of modems, a plurality of modems do not communicate at the same time, only one of the modems selectively operates It is self-evident. That is, the slave modem 210 operates in the multiband-multi mode (MB-MM) mobile communication terminal 200 in the slave mode (that is, the mode in which the slave modem 210 performs communication by a predetermined communication method). The master modem 220 operates in a multiband-multimode (MB-MM) mobile communication terminal 200 in a master mode (ie, a mode in which the master modem 220 performs communication by a predetermined communication method). do.

The slave modem 210 is in charge of various signal processing and control of the baseband when the multi-band multi-mode (MB-MM) mobile communication terminal 200 operates in the slave mode. The slave modem 210 may be a CDMA modem.

The master modem 220 is in charge of various signal processing and control of the baseband when the multi-band-multimode (MB-MM) mobile communication terminal 200 operates in the master mode. The master modem 220 may be a WCDMA modem.

The slave storage unit 230 is connected to the slave modem 210 and stores various parameters related to slave mode operation of the multi-band multi-mode (MB-MM) mobile communication terminal 200. In particular, the high frequency power calibration data of the slave modem 210 is stored.

The master storage unit 240 is connected to a master modem and stores various parameters related to the master mode operation of the multi-band multi-mode (MB-MM) mobile communication terminal 200. In particular, the high frequency power correction data of the master modem 220 is stored.

As described above, the conventional multi-band multi-mode (MB-MM) mobile communication terminal 200 is provided with a plurality of modems that operate independently in each mode. Only handover is performed between the modems, and there is no way to exchange arbitrary information between the modems.

Therefore, the transmission power control of the master modem 220 and the slave modem 210 can not only be performed independently in each modem, but also there is no configuration for measuring the power of the signal transmitted by each modem. You also can't check whether a signal has been sent.

In general, as the mobile communication terminal is located nearer from the base station, signal transmission is smoother. If the mobile communication terminal is far from the base station and thus the information transmission is not good, the signal may be recognized as an interference, which is called a near-far problem. In other words, if the power level of the received signal is too low, the probability that the base station recognizes the signal as noise increases (BIT ERROR RATE), and conversely, if the power level of the signal is too high, it interferes with other signals and degrades the performance of the system. Let's go.

In order to solve this problem, the conventional multi-band multi-mode (MB-MM) mobile communication terminal 200 performs transmission power control of the master modem 220 and the slave modem 210 as described above in each modem. Is implemented.

This transmission power control method may cause a problem that the circuit of the master modem is damaged by excessive transmission power transmission of the slave modem 210 during an intersystem handover.

In addition, the conventional multi-band multi-mode (MB-MM) mobile communication terminal 200 has no way to determine whether the slave modem 210 has sent a signal of the appropriate power, which is the near-wave described in the handover (NEAR-FAR) I still have a problem.

In addition, when abnormal power is generated in the slave modem during handover, the call is dropped due to the failure of the wireless section before the call is completed in the master modem. Serious problems remain such as terminal heating due to transmission, emission of harmful electromagnetic waves, and normal handover.

Accordingly, the present invention has been made to solve the above problems, the master modem of the multi-band multi-mode (MB-MM) mobile communication terminal in the handover can effectively control the power of the transmission signal of the slave modem The present invention provides a method for controlling the transmit power of a slave modem during handover and a multi-band-multimode (MB-MM) mobile communication terminal performing the method.

It is another object of the present invention to effectively control the transmission power of a slave modem terminal from a master modem terminal in a multi-band-multimode (MB-MM) mobile communication terminal during handover due to a call termination phenomenon due to a bad wireless section (CALL-). The present invention provides a method for controlling a transmission power of a slave modem in a handover capable of preventing a DROP, and a multiband-multimode (MB-MM) mobile communication terminal performing the method.

Another object of the present invention is to control the power of the transmission signal of the slave modem in the master modem terminal of the multi-band multi-mode (MB-MM) mobile communication terminal during handover, the heat generation phenomenon of the terminal due to excessive power transmission and SUMMARY OF THE INVENTION The present invention provides a method for controlling transmission and transmission power of a slave modem during handover that can solve problems such as emission of harmful electromagnetic waves, and a multiband-multimode (MB-MM) mobile communication terminal performing the method.

Other objects of the present invention will be readily understood through the following description.

In order to achieve the above objects, there is provided a multi-band multi-mode (MB-MM) mobile communication terminal according to an aspect of the present invention.

According to a preferred embodiment of the present invention, in a multi-band multi-mode (MB-MM) mobile communication terminal in which any one of a plurality of modems provided is selectively operated, a slave modem performing communication in a first communication method And communicate with the slave modem through a control path, perform communication in a second communication scheme, transfer communication authority to the slave modem at the time of handover, and transmit power of the slave modem until the handover is completed. Including a master modem for controlling, wherein the first communication method is a communication method for communication with a first communication network, the second communication method is a communication method for communication with a second communication network different from the first communication network And the control path is formed by control pins of the slave modem and the master modem, respectively, and transmit waves of the slave modem. A transmission power control command is a multi-band, characterized in that the path to be transmitted and received to control - a multimode (MB-MM) mobile communication terminal is provided.

The slave modem is a code division multiple access (CDMA) type modem, the first communication method is a code division multiple access type, the master modem is a broadband code division multiple access (WCDMA) type modem, the second communication The scheme may be a wideband code division multiple access (WCDMA) scheme.

The slave modem and the master modem are coupled by a control path formed by each control pin, and a transmission power control command for controlling the transmission power of the slave modem may be transmitted and received through the control path.

The multi-band multi-mode (MB-MM) mobile communication terminal further includes a high power detection unit, wherein the slave modem is coupled with a slave amplifier for amplifying the power of the signal transmitted by the first communication method, the high power The detection unit detects the power of the signal amplified by the slave amplifier, converts it to a DC value, and transmits the same to the master modem.

In order to achieve the above objects, according to another aspect of the present invention, there is provided a method for controlling the transmission power of a slave modem during handover in a multiband-multimode (MB-MM) mobile communication terminal.

According to a preferred embodiment of the present invention, a method for controlling the transmission power of a slave modem during handover in a multi-band multi-mode (MB-MM) mobile communication terminal in which any one of a plurality of provided modems is selectively operated. In which the master modem instructs the operation of the slave modem, the slave modem in advance to the slave storage; Transmitting an arbitrary signal based on the stored high frequency power correction data, and detecting the detected AGC (auto gain control) value using the DC value inputted from the high power detector and the stored high frequency power correction data of the slave modem in advance. Generating, by the master modem, when the reference AGC value received from the slave modem is inconsistent with the detection AGC value immediately before or after the location registration signal is transmitted, transmitting a corresponding transmit power control command to the slave modem. And terminating the operation of the master modem to perform communication of the slave modem when the reference AGC value and the detection AGC value coincide with each other.

The slave modem to the slave storage in advance Transmitting an arbitrary signal based on the stored high frequency power correction data; and detecting the detected AGC value using the DC value input from the high power detector and the stored high frequency power correction data of the slave modem in advance. The generating may be repeated until the reference AGC value and the detection AGC value coincide.

The master modem uses the high frequency power correction data of the slave modem prestored in the master storage unit to generate the detection AGC value, and the high frequency power correction data of the slave modem is configured to set the transmission power of the slave modem in predetermined m ( Natural number) may be sequentially transmitted in steps of n (natural number) at the interval of dB, and the received transmission power is received and converted into a DC value to store AGC values for the n-stage transmission in the master storage unit for each table. .

The step of instructing the master modem to drive the slave modem may be performed when the master modem indicates that the received signal code power of the system information block received from the network is located in the weak electric field.

The high power detector may be connected between the slave amplifier and the master modem, and may perform a function of feeding back the power of the position registration signal of the slave modem, which is an AC signal, converting it to a DC value and transmitting the DC value to the master modem.

If the reference AGC value and the detection AGC value coincide with each other, the step of terminating the operation of the master modem to perform communication of the slave modem may include transmitting a signal indicating that the slave modem has normally performed handover to the master modem. The master modem receiving the signal may be characterized in that the operation is terminated after transmitting a response to the slave modem.

In order to achieve the above object, according to another aspect of the present invention there is provided a method for controlling the transmission power of a slave modem in the handover in a multi-band multi-mode (MB-MM) mobile communication terminal. According to another preferred embodiment of the present invention, the master modem instructs the operation of the slave modem, the slave modem in advance to the slave storage unit Transmitting an arbitrary signal based on the stored high frequency power correction data; receiving, by the master modem, a detected direct current value corresponding to the arbitrary signal from a high power detector; Transmitting a corresponding transmit power control command to the slave modem when the reference DC value received from the slave modem is inconsistent with the detected DC value immediately before or after the transmission of the signal; and the reference DC value and the detected DC value If it is matched, the method of controlling the transmit power of the slave modem is provided, including the step of terminating the operation of the master modem to perform communication of the slave modem.

The slave modem to the slave storage in advance Transmitting an arbitrary signal based on the stored high frequency power correction data, receiving, by the master modem, a detected direct current value corresponding to the arbitrary signal from a high power detector, and the master modem receiving the position registration signal; If the reference DC value received from the slave modem immediately before or immediately after the transmission of the detected DC value is inconsistent, the step of transmitting a corresponding transmit power control command to the slave modem is identical to the reference DC value and the detected DC value. Can be repeated until

The step of instructing the master modem to drive the slave modem may be performed when the master modem indicates that the received signal code power of the system information block received from the network is located in the weak electric field.

 The high power detector coupled with a slave amplifier for amplifying and outputting the power of the signal transmitted by the slave modem by the first communication method detects the power of the signal amplified by the slave amplifier and converts the signal into a direct current (DC) value. After that, it may be characterized in that the transmission to the master modem.

When the reference DC value and the detected DC value coincide with each other, the step of terminating the operation of the master modem to perform communication of the slave modem is a location registration signal for registering an arbitrary signal to a network. The master modem may end the operation only when a signal indicating that the master modem is normally registered in the network is received.

In order to achieve the above objects, there is provided a multi-band multi-mode (MB-MM) mobile communication terminal according to another aspect of the present invention.

According to another preferred aspect of the present invention, a first module including a first modem for performing communication in a first communication method and a first communication for performing communication in a second communication method and transmitted by the first module And a second module including a second modem for generating a control command for controlling a magnitude of a second transmission signal subsequently transmitted by the first module by comparing the magnitude of the transmission signal with the magnitude of the reference transmission signal. A multiband-multimode (MB-MM) mobile communication terminal is provided.

The multi-band multi-mode (MB-MM) mobile communication terminal may transmit the control command through a control path connected to the first module and the second module.

The multi-band multi-mode (MB-MM) mobile communication terminal may further include a high power detector between the first module and the second module.

The magnitude of the first transmission signal may be a direct current (DC) value corresponding to the power of the first transmission signal of the first module detected by the high power detector.

The magnitude of the first transmission signal may be an automatic gain control (AGC) value corresponding to the power of the first transmission signal of the first module.

The first communication method may be a slave communication method, and the slave communication method may be a CDMA communication method. Also, the first modem may be a slave modem, and the slave modem may be a CDMA modem. In addition, the first module may be a slave module.

The second communication method may be a master communication method, and the master communication method may be a WCDMA communication method. Also, the second modem may be a master modem, and the master modem may be a WCDMA type modem. In addition, the second module may be a master module.

In order to achieve the above object, according to another aspect of the present invention there is provided a transmission power control method of a multi-band multi-mode (MB-MM) mobile communication terminal supporting the first communication method and the second communication method.

According to another preferred embodiment of the present invention, measuring the power of the transmission signal output from the first module including the first modem for performing the first communication method, the second communication method supporting the second communication method Generating a transmission power control command for controlling transmission power by comparing the measured transmission signal power with a reference transmission power in a second module including a modem; and outputting from the first module in response to the power control command There is provided a transmission power control method of a multi-band multi-mode (MB-MM) mobile communication terminal comprising increasing and decreasing the transmission power.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

According to the present invention, a method for controlling the power of a signal (eg, a location registration signal) transmitted by a slave modem during handover between modems provided in a multi-band-multi-mode (MB-MM) mobile communication terminal may be any type. It is apparent that the same or similar method may be applied to a mobile communication scheme (eg, CDMA scheme, WCDMA scheme, TDMA scheme, GSM scheme, etc.). However, hereinafter, a description will be given of a multi-band-multimode (MB-MM) mobile communication terminal having a WCDMA master modem and a CDMA slave modem for convenience of explanation and understanding.

In the following description, an embodiment including one slave modem and one master modem will be described for convenience of explanation and understanding. However, the present invention also applies to a multi-band-multimode (MB-MM) mobile communication terminal having a plurality of slave modems. It is apparent to those skilled in the art that the invention can be applied equally or similarly.

In addition, through the following description, the multi-band-multimode (MB-MM) mobile communication terminal to which the present invention can be applied is not limited to a specific type of terminal, and is equipped with two or more modems according to different communication methods, It can be easily understood that a terminal having a control path capable of detecting information exchanged between a plurality of modems and a high power detector that detects a transmission power output from the slave modem, converts the DC value, and transmits the same to a master modem can be easily understood. will be.

Therefore, those skilled in the art, although not explicitly described or shown herein, can embody the principles of the present invention and invent various methods and apparatus using the same that are included in the concept and scope of the present invention. In addition, it is to be understood that all detailed descriptions, including the principles, aspects, and embodiments of the present invention, as well as listing specific embodiments, are intended to include structural and functional equivalents.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The numbers (eg, first, second, etc.) used in the description of the present specification are merely identification symbols for sequentially distinguishing the same or similar entities.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a multi-band multi-mode (MB-MM) mobile communication terminal equipped with two modems according to an embodiment of the present invention.

As shown in FIG. 3, the multi-band-multimode (MB-MM) mobile communication terminal 300 according to an exemplary embodiment of the present invention includes a slave modem 310, a master modem 320, and a high power detector 330. ), Control path 340, slave storage 350, master storage 360, antenna 370, duplexer 380, slave amplifier 390-1, and master amplifier 390-2. do. As shown, the multi-band multi-mode (MB-MM) mobile communication terminal 300 is provided with a plurality of modems, a plurality of modems do not communicate at the same time, only one of the modems selectively operates It is self-evident. That is, the slave modem 310 operates in the multiband-multi mode (MB-MM) mobile communication terminal 300 in the slave mode (that is, the mode in which the slave modem 310 performs communication by a predetermined communication method). The master modem 320 operates in a multiband-multimode (MB-MM) mobile communication terminal 300 in a master mode (ie, a mode in which the master modem 320 performs communication by a predetermined communication method). do.

The slave modem 310 may be a CDMA modem. Multi-Band-Multi Mode (MB-MM) When the mobile communication terminal 300 operates in slave mode (ie, communication mode according to the CDMA communication method), it performs various signal processing and control of the CDMA base band. do. In addition, when a driving start command is received from the master modem 320 through the control path 340, the slave modem 310 transmits a location registration signal for location registration to the network for handover, and transmits the location registration signal. A reference Auto Gain Control (hereinafter referred to as "AGC") value corresponding to the power is transmitted to the master modem 320 via the control path 340. Of course, the position registration signal may be transmitted after the reference AGC value is transmitted to the master modem 320. In addition, when the slave modem 310 receives the transmit power control command from the master modem 320, the slave modem 310 changes the transmit power of a signal to be transmitted later to correspond to the received transmit power control command. Here, the transmission power control command may include any AGC value.

The master modem 320 may be a WCDMA modem. Multi-Band-Multi Mode (MB-MM) When the mobile communication terminal 300 operates in the master mode (that is, the communication mode by the WCDMA communication method), it performs various signal processing and control of the WCDMA baseband. In addition, if the received signal code power (RSCP) value of the system information (SIB3 or SIB4) received from the network is less than the threshold value (Threshold Value), the master modem 320 to perform a handover to the slave modem (310) The drive start command is transmitted to the slave modem 310. The master modem 320 transmits a drive start command to the slave modem 310, and then converts the DC value received from the high power detector 330 into a corresponding automatic gain control value (hereinafter referred to as a detection AGC value). The reference AGC value received from the slave modem 310 through the control path 340 is compared. If there is a difference between the two values, the slave modem 310 transmits a signal (that is, a transmit power control command) to the slave modem 310 through the control path 340 to increase or decrease the power of the transmitted signal. .

The high power detector 330 (High Power Detector, HDET) detects the transmission power amplified by the slave amplifier 390-1 by the position registration signal transmitted by the slave modem 310, converts it into a corresponding DC value, and converts the master into a corresponding DC value. Transmit to modem 320.

The control path 340 is formed by a control pin between the master modem 320 and the slave modem 310, where the master modem 320 and the slave modem 310 pass any signal (e.g., For example, a driving start command, a reference AGC value, a transmission power control command, and the like are exchanged.

The slave storage unit 350 is connected to the slave modem 310 and stores various parameters related to slave mode operation of the multi-band multi-mode (MB-MM) mobile communication terminal 300. In particular, the high frequency power calibration data of the slave modem 310 is stored. The slave modem 310 determines the transmission power based on the high frequency power correction data (hereinafter, referred to as 'reference AGC value') stored in the slave storage unit 350.

The master storage unit 360 is connected to the master modem 320 and stores various parameters related to the master mode operation of the multi-band multi-mode (MB-MM) mobile communication terminal 300. In addition, the high frequency power correction data of the master modem 320 is stored. In addition, the high frequency power correction data of the slave modem 310 is stored for power control of the transmission signal of the slave modem 310. This data may be the same as or corresponding to a value stored in the slave storage unit 350. However, there may be a slight difference in the amount value at the process step. In this case, it is apparent to those skilled in the art that the present invention can be equally applied by comparing two values and performing a task of correcting a difference. The master modem 320 uses an automatic gain control value corresponding to the DC value received from the high power detector 330 using the high frequency power data of the slave modem 310 stored in the master storage unit 360 (hereinafter, 'detected AGC value'). Is called). In the master storage unit 360, a storage unit for storing the high frequency power correction data of the slave modem 310 and a storage unit for storing the high frequency power correction data of the master modem 320 are separately or one storage unit. It can be stored together or stored in each storage unit with two storage units. This is because it is only data for comparison with a reference AGC value. Therefore, if the master modem 320 can read the data, it does not matter in which storage. However, it is assumed that the case is stored together in one memory to help understand the present invention.

Here, the slave modem 310, the slave storage unit 350, and the slave amplifier 390-1 operate when the multi-band multi-mode (MB-MM) mobile communication terminal 300 operates in slave mode. Component. Therefore, it can be referred to as a slave module. Of course, it will be apparent to those skilled in the art that the slave module may further include many other devices.

In addition, the master modem, the master storage unit 360 and the master amplifier 390-2 are components that operate when the multi-band multi-mode (MB-MM) mobile communication terminal 300 operates in the master mode. Therefore, it may be referred to as a 'master module'. Of course, it will be apparent to those skilled in the art that the master module may further include many other devices.

The antenna 370 performs a function of transmitting and receiving signals between the multiband-multimode (MB-MM) mobile communication terminal 300 and a communication network (for example, a CDMA network and / or a WCDMA network).

The duplexer 380 separates signals of different basebands of the master modem 320 and the slave modem 310.

The slave amplifier 390-1 amplifies the signal transmitted from the slave modem 310 to the duplexer 380, and the master amplifier 390-2 amplifies the signal transmitted from the master modem 390-2. Transfer to the duplexer 380.

4 is a flowchart illustrating a process of storing high frequency power correction data of a slave modem in the master storage unit 360 according to an exemplary embodiment of the present invention. In general, the following process is performed at the manufacturing stage of the terminal.

As shown, in step 410, a high frequency power calibration (TX power calibration) of the slave modem 310 is performed, and the corrected value is stored in the slave storage unit 330 (step 420).

In order to obtain the transmission power corresponding to the range specified by each communication protocol (PROTOCOL), it is necessary to calibrate the parameters used by the software installed in the mobile terminal. Tansmission power calibration. A detailed description of the high frequency power correction is omitted since it is a known technique.

For example, when the slave modem transmits transmission power at 3 dB intervals of 0, 3, 6, 9, 12 dBm, etc., the slave storage unit 350 automatically corrects 16 auto gains for the transmitted transmission power. Control (AGC) values are stored in a table. If the transmission power is 0dBm, the AGC value is 10. If the transmission power is 2dBm, the AGC value is 20 when the AGC value is 20. The AGC value for the transmission power 1dBm is 15 by their slope. In this case, when the slave storage unit 350 is an 8-bit memory, the slave storage unit 350 may be stored in 256 steps. The AGC value generation is based on an internal algorithm of the slave modem 310. In detail, it generates by driving a circuit for monitoring the ADC in the modem, which is a well-known technology, and a detailed description thereof will be omitted.

In operation 430, the slave modem 310 transmits a signal to the network using a reference AGC value stored in the slave storage unit, and the high power detector 330 detects a transmission power of the transmitted signal. The reference AGC value may be determined according to a predetermined criterion, and a method of determining the power of a signal transmitted to the network by the slave modem 310 for location registration, etc. will be apparent to those skilled in the art, and thus detailed description thereof will be omitted.

In operation 440, the high power detector 330 converts the detected transmission power into a corresponding DC value and transmits the same to the master modem 320.

In operation 450, the master modem 320 receives the DC value transmitted by the high power detector 330, generates an automatic gain control (AGC) value corresponding to the DC value, and then stores the generated AGC value in the master storage unit ( 360). The process of generating the AGC value is based on an internal algorithm of the master modem 320. In detail, it generates by driving a circuit for monitoring the ADC in the modem, which is a well-known technology, so a detailed description is omitted. In this case, it will be apparent to those skilled in the art that a reference table for generating AGC values may be provided in the master modem 320 or in a combined storage device. The value stored in the master storage unit 360 and the value stored in the slave storage unit 350 are the same. However, although there may be a slight difference in the amount of the process step, the present invention can be equally applied as described above.

The above-described process may be repeated over a plurality. For example, since the PCS band is divided into 16 signals having 0-15 dBm levels, the above-described process will be repeated at least 16 times until an auto gain control value corresponding to 16 levels is generated.

5 is a flowchart illustrating a process in which a master modem controls transmission power of a slave modem during handover according to an exemplary embodiment of the present invention.

Hereinafter, a transmission power control method of the slave modem 310 will be described with reference to FIG. 5. Herein, a description will be given of a transmission power control method of the slave modem 310 by the master modem 320 during handover. However, this is only one embodiment. Accordingly, communication is normally performed by one of a plurality of modems (for example, slave modem 310) provided with the multi-mode multi-band (MB-MM) mobile communication terminal 300, not during handover. Even in this case, it is apparent that the master modem 320 can control the transmission power of the slave modem 310. At this time, it is apparent to those skilled in the art that the master modem 320 does not perform communication but performs an operation for controlling the transmission power of the slave modem 310.

In addition, it is assumed that an arbitrary signal transmitted by the slave modem 310 and subjected to the transmission power control of the master modem 320 is a location registration signal for location registration to the network.

The multi-band-multimode (MB-MM) mobile communication terminal 300 located in the overlay region 110-1, 110-2, or 110-3 is initialized by the master modem 320 to perform communication by the WCDMA scheme. Will be in the running state (step 500).

In step 510, the master modem 320 determines whether or not located in the weak field using the signal received from the network.

The method for determining whether the MB-MM mobile communication terminal 300 is located in the weak electric field is determined by using the signal strength received from the network, by receiving a handover instruction message from the network. There can be a variety of ways, such as to judge. For example, during a handover from WCDMA to CDMA, the WCDMA modem receives a received signal code power (RSCP) of system information (for example, SIB3, SIB4, etc.) from the network and sets a predetermined threshold value. Less than), it can be determined that it is located in the weak field.

In step 520, if it is determined that the weak electric field is located, the master modem 320 starts driving to drive the slave modem 310 to initiate handover between the modems (i.e., intersystem handover). The command is sent to the slave modem 310 via the control path 340.

In operation 525, the slave modem 310 that receives the driving start command from the master modem 320 starts driving.

The method of driving the slave modem 310 may be variously implemented, such as a software implementation method or a method driven by the control of the master modem 320. For example, the slave modem 310 may start driving when the slave modem 310 receives a driving start command, which is a signal indicating the start of driving, from the master modem 320 through the control path 340.

In the above-described steps 500 to 525, in the transmission power control method of the slave modem 310 when the multi-band-multimode (MB-MM) terminal operates normally as the slave modem 310 without performing a handover, It can be omitted.

In step 530, the slave modem 310 transmits a location registration signal for location registration to the network. The network in which the slave modem 310 transmits the location registration signal will be different from the network in which the master modem 320 communicated in step 500.

In operation 535, the reference AGC value, which is the basis of the location registration signal, among the data (TX power Cal data) stored in the slave storage unit 350 is transmitted to the master modem 320 through the control path 340. Of course, the slave modem 310 may transmit the location registration signal after transmitting the reference AGC value to the master modem 320. Only the above-described method is described for convenience of understanding.

The high power detector 330 detects the power of the position registration signal amplified and transmitted by the slave amplifier 390-1 (step 540), converts the detected power into a corresponding DC value, and then transfers the detected power to the master modem 320. Transmit (step 545).

In operation 550, the master modem 320 generates a detection AGC value corresponding to the DC value received from the high power detector 330. The detection AGC value is generated using the high frequency power correction data of the slave modem 310 stored in the master storage unit 360. For example, if the received DC value is 0 dB and the corresponding AGC value is 10, the detection AGC value is 10.

 In operation 560, the master modem 320 determines whether the generated detection AGC value matches the reference AGC value received from the slave modem 310.

If the detected AGC value is compared with the reference AGC value and the two values coincide, the apparatus waits until the handover completion signal is received from the slave modem 310.

However, if the detected AGC value is different from the reference AGC value, the process proceeds to step 570 where the master modem 320 issues a transmit power control command for the transmit power control of the slave modem 310. To send). For example, the master modem 320 transmits a transmission power control command for lowering the transmission power when the detection AGC value of the comparison result of step 560 is larger than the reference AGC value. The control command is sent to the slave modem 310 via the control path 340.

Herein, a method of transmitting a transmission power control command to the slave modem 310 by comparing the reference AGC value and the detected AGC value with the master modem 320 has been described. However, even when the master modem 320 compares the DC value received from the high power detector 330 with the reference DC value received from the slave modem 310 and transmits a transmission power control command to the slave modem 310, It is apparent to those skilled in the art that the same may be applied. In this case, the reference direct current value is a direct current value corresponding to the signal transmitted by the slave modem 310, and the slave modem 310 transfers the control direct path 350 to the master modem 320 before or after the signal transmission. Send it through.

Upon receiving the transmit power control command from the master modem 320 via the control path 360, the slave modem 310 transmits a signal by changing the power of a signal transmitted later to correspond to the transmit power control command (step 580). .

In step 590, the slave modem 310 reliably performs a handover and transmits a signal to the master modem 320 indicating that the handover was successfully performed if the location registration is completed in the network.

In step 595, the master modem 320 sends a response (eg, an ACK signal) to the slave modem 310 to terminate the handover, and in step 596, the master modem 320 ends the operation.

In step 597, when the slave modem 310 receives the response (ACK signal) from the master modem 320, the multi-band-multimode (MB-MM) mobile communication terminal 300 drives only the slave modem 310. Operate in slave mode.

It will be apparent to those skilled in the art that the above-described steps 590 to 597 may be omitted in the case of the transmission power control method of the slave modem 310 when the slave modem 310 normally communicates, not during handover.

       In the above description, only one time of the transmission power control process has been described, but a plurality of transmission power control may be required until the reference AGC value and the detection AGC value are the same. For example, in step 580, although the slave modem 310 transmits the changed transmission power, the detected AGC value may also be different from the reference AGC value. In this case, the steps 540 to 580 may be repeated until the two values become the same. Of course, the signal transmitted by the slave modem 310 to the network in this process may vary.

In addition, although the above has been described using the location registration signal as an example, it is obvious that the present invention may be equally applied to all signals transmitted from the slave modem to the network.

As described above, the method for controlling the transmission power of the slave modem during the handover and the multi-band multi-mode (MB-MM) mobile communication terminal performing the method are multi-band-multi mode during the handover according to the present invention. (MB-MM) In the mobile communication terminal, it is effective to effectively control the power of the transmission signal of the slave modem from the master modem.

In addition, the present invention effectively controls the transmission power of the slave modem terminal from the master modem terminal in the multi-band multi-mode (MB-MM) mobile communication terminal during handover in the multi-band multi-mode (MB-MM) mobile communication terminal Therefore, there is an effect that can reduce the call termination phenomenon (CALL-DROP) due to a bad wireless section.

In addition, the present invention effectively reduces the power of the transmission signal of the slave modem in the master modem stage in the multi-band multi-mode (MB-MM) mobile communication terminal during handover in the multi-band multi-mode (MB-MM) mobile communication terminal By controlling it, there is also an effect that can solve problems such as heat generation of the terminal due to excessive power transmission and emission of harmful electromagnetic waves.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below It will be appreciated that modifications and variations can be made.

Claims (22)

A slave modem performing communication in a first communication method; And Connected to the slave modem via a control path, performing communication in a second communication scheme, transferring communication authority to the slave modem at the time of handover, and transmitting power of the slave modem until the handover is completed. Include the controlling master modem, The first communication method is a communication method for communication with the first communication network, the second communication method is a communication method for communication with a second communication network different from the first communication network, The control path is formed by a control pin of each of the slave modem and the master modem, the multi-band multi-mode (MB) characterized in that the transmission power control command for controlling the transmission power of the slave modem is transmitted and received -MM) mobile communication terminal. The method of claim 1, The slave modem is a code division multiple access (CDMA) modem, the first communication method is a code division multiple access, The master modem is a wideband code division multiple access (WCDMA) modem, the second communication method is a wideband code division multiple access (WCDMA). delete The method of claim 1, Further comprising a high power detector, The slave modem is coupled with a slave amplifier for amplifying the power of the signal transmitted by the first communication method, and the high power detector detects the power of the signal amplified by the slave amplifier and converts it into a direct current (DC) value. And transmitting to the master modem after the multi-band multi-mode (MB-MM) mobile communication terminal. The method of claim 4, wherein The slave modem transmits a reference AGC (auto gain control) value corresponding to the transmission power of the signal immediately before or immediately after transmission of the signal to the master modem through the control path, The master modem controls the transmission power of the slave modem by using a match between the detection AGC value generated using the DC value and the reference AGC value. Communication terminal.  In the multi-band multi-mode (MB-MM) mobile communication terminal in which any one of a plurality of modems selectively operated, a method for controlling the transmission power of the slave modem in the handover, (a) the master modem instructing the operation of the slave modem; (b) Slave Modem is stored in Slave Storage in advance Transmitting an arbitrary signal based on the stored high frequency power correction data; (c) generating, by the master modem, a detection AGC (auto gain control) value by using a DC value input from a high power detector and pre-stored high frequency power correction data of a slave modem; (d) the master modem transmitting a corresponding transmit power control command to the slave modem when the reference AGC value received from the slave modem immediately before or after the transmission of the arbitrary signal and the detection AGC value do not match; And and (e) terminating the operation of the master modem to perform communication of the slave modem when the reference AGC value and the detection AGC value match. The method of claim 6, The steps (b) to (d) above are repeated until the reference AGC value and the detection AGC value coincide.  The method of claim 6,  The master modem uses the high frequency power correction data of the slave modem previously stored in the master storage unit to generate the detection AGC value, the high frequency power correction data of the slave modem,  The transmission power of the slave modem is sequentially transmitted in n (natural number) steps at predetermined m (natural number) dB intervals, and the received transmission power is received and converted into a DC value for transmission of n steps to the master storage unit. Transmitting power control method of a slave modem, characterized in that for storing the AGC value for each table.  The method of claim 6, Step (a) is, The master modem transmit power control method of the slave modem, characterized in that performed when the received signal code power of the system information block received from the network is located in the weak field.  The method of claim 6,  The high power detector coupled with a slave amplifier for amplifying and outputting the power of the signal transmitted by the slave modem by the first communication method detects the power of the signal amplified by the slave amplifier and converts the signal into a direct current (DC) value. Transmitting and controlling the transmission power of the slave modem after the transmission to the master modem. The method of claim 6, Step (e), And the master modem terminates operation only when a signal indicating that the master modem is normally registered in the network is received from the slave modem. In the multi-band multi-mode (MB-MM) mobile communication terminal in which any one of a plurality of modems selectively operated, a method for controlling the transmission power of the slave modem in the handover, (a) the master modem instructing the operation of the slave modem; (b) Slave Modem is stored in Slave Storage in advance Transmitting an arbitrary signal based on the stored high frequency power correction data; (c) receiving, by the master modem, a detected direct current value that is a direct current value corresponding to the arbitrary signal from a high power detector;  (d) transmitting, by the master modem, a corresponding transmit power control command to the slave modem when the reference DC value received from the slave modem is inconsistent with or immediately after the transmission of the location registration signal; And and (e) terminating the operation of the master modem to perform communication of the slave modem when the reference DC value and the detected DC value match. The method of claim 12, The steps (b) to (d) are repeated until the reference DC value and the detected DC value is repeated, the transmission power control method of the slave modem.  The method of claim 12, Step (a) is, The master modem transmit power control method of the slave modem, characterized in that performed when the received signal code power of the system information block received from the network is located in the weak field.  The method of claim 12,  The high power detector coupled with a slave amplifier for amplifying and outputting the power of the signal transmitted by the slave modem by the first communication method detects the power of the signal amplified by the slave amplifier and converts the signal into a direct current (DC) value. Transmitting and controlling the transmission power of the slave modem after the transmission to the master modem. The method of claim 12, In step (e), the arbitrary signal is a location registration signal for location registration to the network, and the master modem ends the operation only when a signal indicating that the network is normally registered from the slave modem. Transmit and transmit power control method of a slave modem. A first module including a first modem for performing communication in a first communication scheme; By performing communication in a second communication method, comparing the magnitude of the first transmission signal transmitted by the first module and the magnitude of the reference transmission signal, the magnitude of the second transmission signal subsequently transmitted by the first module is determined. A multiband multi-mode (MB-MM) mobile communication terminal comprising a second module comprising a second modem for generating a control command to control. The method of claim 17, Multi-band multi-mode (MB-MM) mobile communication terminal, characterized in that for transmitting the control command via a control path connected to the first module and the second module. The method of claim 17, And a high power detector between the first module and the second module. The method of claim 19, The size of the first transmission signal is a multi-band multi-mode (MB-MM) mobile communication, characterized in that the direct current (DC) value corresponding to the power of the first transmission signal of the first module detected by the high power detector. terminal. The method of claim 19, The magnitude of the first transmission signal is a multi-band multi-mode (MB-MM) mobile communication terminal, characterized in that the automatic gain control (AGC) value corresponding to the power of the first transmission signal of the first module. In the transmission power control method of a multi-band multi-mode (MB-MM) mobile communication terminal supporting the first communication method and the second communication method, Measuring a power of a transmission signal output from a first module including a first modem performing the first communication scheme; Generating a transmission power control command for controlling transmission power by comparing the measured transmission signal power with a reference transmission power in a second module including a second modem supporting the second communication scheme; And Increasing / decreasing the transmission power output from the first module in response to the power control command (MB --- transmission power control method of a mobile communication terminal).

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