KR20060007854A - A method and a apparatus of out power control on system hand-over for mobile phone - Google Patents

Abstract

The present invention is to perform the corresponding power control corresponding to the closed loop power control by the table search, when the mobile terminal handovers the system, operating by selection and controlling the corresponding processing and transmission and reception of the third generation communication signal and the output power 3G modem unit; A 2G modem unit which is operated by selection and controls corresponding processing, transmission / reception and output power of a second generation communication signal; A control unit connected to a 3G modem unit and a 2G modem unit, and selectively operated by a system handover and controlling output power of a radio signal with a retrieved PD value; And a table unit for connecting to the control unit, recording and storing the PDG value of the 2G system which is the same as the PDG value of the 3G system, and outputting the retrieved PDM value. A multi-process for controlling the 3G modem unit to occupy the allocated channel and controlling the wireless output power when the third generation system accesses and communicates with the third generation system; A determination process of receiving corresponding system information from the second generation system when handing over from the connected third generation system to the second generation system; The mobile terminal controller transfers 3G system information and PDM values received by the 3G modem unit to the 2G modem unit and performs handover to the 2G system; The portable terminal controller may be configured to detect a second generation PD value corresponding to the final PD value by searching a table, and to control a corresponding output power and register a location.

Description

System handover power control device and method of mobile terminal {A METHOD AND A APPARATUS OF OUT POWER CONTROL ON SYSTEM HAND-OVER FOR MOBILE PHONE}

1 is a diagram illustrating a general mobile communication system handover function;

2 is a flowchart of a system handover power control method during communication of a conventional mobile terminal;

3 is a functional block diagram of a system handover power control apparatus of the present invention portable terminal;

4 is a flowchart illustrating a system handover power control method for a portable terminal of the present invention.

** Explanation of symbols on the main parts of the drawing **

100: 3G wireless unit 110: 2G wireless unit 120: 3G modem unit

130: 2G modem unit 140: table unit 150: control unit

160: baseband portion

The present invention relates to output power control when a portable terminal is connected to a system and is in communication with another system and handovers to another system. More particularly, the present invention relates to a table of power control values corresponding to PD values, which are closed loop power control information. The present invention relates to a system handover power control apparatus and method for a portable terminal for controlling the output power corresponding to the handed over system by searching for and controlling the output power.

The mobile terminal for mobile communication (MS: MOBILE STATION) monitors the mobile switching center (MSC) while moving freely in the service area formed by the corresponding base station (RAN: RADIO ACCESS NETWORK) of the registered system. It is a high-tech wireless communication device that communicates instantly with the desired party anytime, anywhere through the communication path set by the control and switching, and moves anywhere while the individual is carrying it directly.

The mobile communication system including the mobile terminal (UE) was operated in a communication method using a voice level signal in the first generation (1G: Ist GENERATION), and gradually increases the communication demand and the amount of data to be transmitted, thereby causing the second generation ( 2G), a message data communication function using numbers, letters, symbols, and the like has been added, and current generation 3G mobile communication systems include multimedia level communication in which a video signal is included in the above-mentioned sound level and character level signals. Developing in a way.

The first generation mobile communication system was an analog (ANALOG) method, the second generation (2G) system is a digital (DIGITAL) method, generally using a code division multiple access (CDMA) method, the third generation (3G) The system uses a wideband (WIDE-BAND) code division multiple access (WCDMA) scheme.

In the code division multiple access (CDMA) scheme and the wideband code division multiple access (WCDMA) scheme, the output power of the mobile station MS must be constantly received at the same level at the corresponding base station RAN, due to system operation characteristics. The output power control of the portable terminal is important enough to influence the performance of the mobile communication system.

The mobile terminal (MS) registers a location with a mobile switching center (MSC) through a base station (RAN) in order to receive a mobile communication service, and controls the output power under control of the base station (RAN).

The output power control method of the portable terminal includes an open loop power control method and a closed loop power control method.

The open loop power control method is a power control in a state in which a communication channel is not allocated and connected between a base station (RAN) and a mobile terminal (MS), and simply transmits and receives data information for system operation. In the power control method, the output power of the mobile terminal is controlled by the base station under the control of the mobile switching station while the communication channel is allocated and occupied and connected between the base station and the mobile terminal.

The open loop power control is generally power controlled in units of +/- 9 divisions (dB), the closed loop power control is power controlled in units of +/- 1 divisions (dB), and the power control is performed by a base station. It is controlled by the PULSE DENSITY MODULATION (PDM) value received from the PDM.

The mobile terminal (MS) is guaranteed to be mobile, the movement radius is not limited and very free, the base station (RAN) is limited because the service area to be formed, a plurality of base stations are continuously arranged at regular intervals each service Since the areas are continuous, they form a service area of the entire system.

Each base station (RAN) under the control of the mobile switching center (MSC) has a different radio frequency of the operating channel to avoid interference and interference with neighboring base stations (RAN).

Therefore, the mobile terminal MS is guaranteed mobility, and when communicating while moving in the service area formed by each base station RAN, the mobile terminal MS is connected to each base station to register a location and receive a communication channel. When the base station (RAN) is changed, by the handover (HAND0OVER), the new base station is registered and the new channel is allocated to maintain ongoing communication.

As described above, handover that occurs when communication is performed in the service area of the same mobile communication system outputs PDM information under the control of the mobile switching station, thereby ensuring continuity.

The third generation mobile communication system is an advanced mobile communication system that provides multimedia communication service based on video signals. The facilities and the maintenance and maintenance costs of base stations and mobile switching centers are relatively expensive, and since the beginning of the business, the facilities are available nationwide. At the same time, it is mainly installed in large cities with high utilization rates, and small and medium cities and provinces with low utilization rates are using existing 2G systems.

However, when a handover to change the system occurs, especially when a handover occurs between the 3G 3G system and the 2G 2G system, a power control problem occurs.

That is, under the same conditions, there is a problem in that the power control PD value by the 3G system and the power control PD value by the 2G system are different in each system characteristic.

For example, when a handover to a 2G system is performed while connected to a 3G system and communication is in progress, the 3G system receives power control in a closed loop method, and an open loop method is initially performed in a 2G system in which a handover is performed. Since the power is controlled, there is a problem in that the output power of the portable terminal cannot be normally controlled.

Therefore, there is a need to develop a technique for normally controlling the output power of the mobile terminal in the early stage of system handover.

Hereinafter, a system handover power control method during communication of a portable terminal according to the related art will be described with reference to the accompanying drawings.

1 is a diagram illustrating a general mobile communication system handover function, and FIG. 2 is a flowchart of a method for controlling system handover power during communication of a mobile terminal according to the prior art.

Referring to FIG. 1, a general mobile communication system handover will be described. For example, the mobile terminal 10 processes 3G (3G) multimedia communication, 2G (2G) data communication, and voice level communication. Each function unit is integrally provided and selectively operated in the service area.

The 3G base station 20 of FIG. 1 forms a corresponding service area 25, is controlled and monitored by the 3G mobile switching center 30, and the 2G base station 40 forms a corresponding service area 45. Under control and monitoring of the 2G mobile switching center 50.

The 3G mobile switching center 30 and the 2G mobile switching center 50 are operated by the same service provider or are allowed to handover the system by a roaming service contract or the like and continue to provide communication services.

In the service area 25 of the 3G base station 20, the mobile terminal 10 automatically selects and operates the corresponding 3G function unit in order to receive 3G service, and in the service area 45 of the 2G base station 40, It automatically selects and operates the corresponding 2G function unit to receive 2G service.

For example, when the mobile terminal 10 is located in the service area 25 of the 3G base station 20, the built-in 3G function unit operates to occupy an allocated communication channel and perform communication, and the 3G mobile switching center ( The output power during communication is controlled by the PDM value received by the closed loop power control signal of the 3G base station 20 under the control and monitoring of 30).

When the mobile terminal 10 moves to enter the service area 45 of the 2G base station 40, the mobile terminal 10 occupies a communication channel allocated by the 2G base station 40 by a system handover, and initially Since the location of the mobile terminal 10 was not registered in the 2G mobile switching center 50, the output power is controlled by the corresponding PDM value received by the open loop power control by the 2G base station 40, When the location registration is completed, the closed loop power control is received from the 2G base station 40.

The code division multiple access (CDMA) mobile communication system has a characteristic of receiving power output from the plurality of mobile terminals 10 at the same level of power at the base station RAN, and thus output power of the mobile terminal 10. Control directly.

In particular, during communication, the output power of the portable terminal 10 is precisely controlled by the base station RAN in a closed loop power control method, and in an open loop power control method when the communication state or the location registration is not performed. To control the output power of the mobile terminal.

The PDM value of the open loop power control method has a relatively large control step of +/− 9 dB, and the PDM value of the closed loop power control method has a control step of +/− 1. Since it is within dB, power control is relatively precise.

Therefore, when receiving a closed loop power control PD value within +/- 1 dB during communication, and receiving an open loop power control PD value of +/- 9 dB at the beginning of system handover, the mobile terminal ( The output power of 10) causes a large difference from the neighboring mobile terminal 10 on the basis of the base station reception.

The portable terminal which has handed over the system as described above is initially subjected to the open loop power control, and when the location registration is completed, the portable terminal receives the closed loop power control.

As described above, there is a difference in output power from a neighboring portable terminal in the state of receiving open loop power control in the early stage of system handover, and the neighboring portable terminal recognizes it as noise and increases the output power competitively, and code division multiple access (CDMA) Due to the characteristics of the base station, the channel margin allocated by the base station is reduced, and the signal-to-noise ratio of the communication signal becomes poor, resulting in a decrease in communication sensitivity.

Hereinafter, a system handover power control method during communication of a portable terminal according to the related art will be described with reference to FIG. 2.

When the mobile terminal 10 for mobile communication uses the mobile communication service by accessing and registering the 3G base station 20 in the service area 25 formed by the base station 20 of the 3G system (S10), a built-in device is provided. The 3G function unit is selected and operated to occupy a channel allocated by the 3G base station 20 and use a mobile communication service (S20).

The portable terminal 10 receives the closed loop power control of the 3G base station 20 while occupying a channel and performing communication, and precisely controls the output power to +/− 1 dB or less (S30).

When the mobile terminal 10 having the mobility guarantees a handover to move to the service area 45 formed by the base station 40 of the 2G system (S40), the mobile terminal 10 has a 2G function. It selects and operates the unit, occupies a channel allocated by the base station 40 of the 2G system and continues to use the mobile communication service in the 2G manner (S50).

Since the portable terminal 10 has not registered a location with the 2G mobile switching center 50 at the beginning of the system handover, the mobile terminal 10 is controlled by the 2G base station 40 under the control and monitoring of the 2G mobile switching center 50. Receive open loop power control by +/- 9 dB interval (S60).

Since the system handover portable terminal 10 provides location registration information through the connected 2G base station 40, the location registration is performed in the 2G mobile switching center 50 (S70), and the location is registered as described above. In step S80, the closed loop power control is performed by the 2G base station 40 under the control and monitoring of the 2G mobile switching center 50 (S80).

In the prior art as described above, since the system is subjected to open loop power control at intervals of +/- 9 dB from the handed-over system at the initial stage of the system handover, it generates different output power from the portable terminal 10 near the vicinity. In addition, since the neighboring portable terminal 10 is recognized as noise, there is a problem in that the output power is competitively increased in order to increase the signal-to-noise ratio.

In addition, since each mobile terminal 10 competitively increases the output power, there is a problem that the channel capacity allocated by the base station (RAN) is reduced.

The present invention records and stores the PDM values, which are the respective output power control values, in a table corresponding to each other in a 2G and 3G portable terminal, and the final PD value by the closed loop power control of the previous system at the initial stage of system handover. The present invention provides a system handover power control apparatus and method for a portable terminal which stabilizes the output power of the portable terminal since the PD value of the handover system is searched and applied.

The present invention has been made in order to achieve the above object, 3G modem unit for selection and control the processing and transmission and output power of the third generation communication signal; A 2G modem unit which is operated by selection and controls corresponding processing, transmission / reception and output power of the second generation communication signal; A control unit connected to the 3G modem unit and the 2G modem unit, and selectively operated by system handover and controlling the output power of the radio signal with the retrieved PD value; And a table unit for accessing the control unit, recording and storing the PDG value of the 2G system that is identical to the PDM value of the 3G system, and outputting the retrieved PDM value.

In addition, the present invention has been made in order to achieve the above object, the multi-process for controlling the wireless output power to occupy the allocated channel by controlling the 3G modem unit when the mobile terminal control unit to communicate with the 3G system; ; A determination process of receiving corresponding system information from the second generation system when handing over from the connected third generation system to the second generation system in the above process; The mobile terminal controller of the above process comprises: a transfer process of transmitting 3G system information and PDM values received by the 3G modem unit to the 2G modem unit and handing over to the 2G system; The portable terminal controller of the above process comprises a control process of detecting a second generation PD value corresponding to the final PD value by searching the table unit, and controlling the corresponding output power and registering the position.

Hereinafter, the present invention will be described with reference to the accompanying drawings a system handover power control apparatus and method of a portable terminal.

3 is a functional configuration diagram of a system handover power control apparatus for a portable terminal according to the present invention, and FIG. 4 is a flowchart of a system handover power control method for a portable terminal according to the present invention.

Referring to FIG. 3, a system handover power control apparatus of a portable terminal according to the present invention will be described. The wireless connection with a 3rd generation base station (RAN) at an output power set by the control of the 3G modem unit 120 is performed. 3G wireless unit 100 for wireless transmission and reception of 3G communication signals and system operation data,

2G wireless unit 110 for wirelessly connecting to the second generation base station (RAN) at the output power set by the control of the 2G modem unit 130, and wireless transmission and reception of second generation communication signals and system operation data;

It is connected to the 3G wireless unit 100, is operated by the selection of the control unit 150 and controls the corresponding processing, transmission and reception and output power of the 3G (3G) communication signal, operating by the selection of the control unit 150 3G modem unit 120 for outputting the system operation data received from the base station (RAN) via the 3G radio unit 100, modulating and demodulating and processing the third generation communication signal transmitted and received,

It is connected to the 2G wireless unit 110, is operated by the selection of the control unit 150 and controls the corresponding processing, transmission and reception and output power of the second generation (2G) communication signal, operating by the selection of the control unit 150 And a 2G modem unit 130 for outputting system operation data received from the base station RAN through the 2G radio unit 110, and for demodulating and demodulating the second generation communication signals transmitted and received,

The third generation by connecting to the control unit 150 and recording and storing the PDM value of the 2G system that is the same as the PDM value of the 3G system as a table, and outputs the retrieved corresponding PDM value, the third generation PDM value for controlling the wireless output power of the mobile terminal by the closed loop power control of the base station (RAN), and PDM (controlling the wireless output power of the mobile terminal by the closed loop power control of the second generation base station) PDM) values are arranged to be correlated to the same level, recorded and stored in a table, and the corresponding system base station to be handed over by a search when a final PDM value of a 2nd or 3rd generation base station (RAN) is inputted. A table unit 140 for outputting a PDM value of the RAN;

The 3G modem unit 120 is connected to the 3G modem unit 120 and the 2G modem unit 130, and selectively operated by system handover, and controls the output power of the radio signal using the retrieved PDM value. And 2G modem unit 130, and selectively operates to connect to the corresponding system that controls the service area (SERVICE AREA), in the case of a system handover (SYSTEM HAND OVER), by searching the table unit 140, The modem unit 120, 130 corresponding to the currently received power control PD (PDM) value, checks the power control PD (PDM) value of the system to be handed over, and selects the checked PDDM value. A control unit 150 for controlling the wireless output power by

The baseband unit 160 is connected to the control unit 150 and includes a baseband unit 160 for processing a communication signal transmitted and received as a baseband.

Hereinafter, a system handover power control apparatus of a portable terminal according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

The portable terminal (MS) according to the present invention is a 3G wireless unit 100 and a 3G modem unit 120 to access a third generation mobile communication system providing a mobile communication service in a multimedia-class communication method including a video signal. ) Is integrally provided.

In addition, the mobile terminal (MS), the 2G wireless unit 110 and the 2G modem unit (2G) for accessing the second generation mobile communication that provides a text message data communication service, including letters, symbols, numbers, graphics, etc. 130 is integrally provided.

The 3G radio unit 100 is operated by the control and monitoring of the 3G modem unit 120, the 2G radio unit 110 is operated by the control and monitoring of the 2G modem unit 130. The 3G modem unit 120 and the 2G modem unit 130 are operated by the control and monitoring of the controller 150.

The table 140 is output by the 3rd generation mobile communication system, and is output by the PDM for closed loop power control, and is output by the 2nd generation mobile communication system. At the same time, all the DM values are recorded and stored, and the corresponding DM values are output in the form of a table so that corresponding values are related.

For example, when a mobile terminal (MS) wants to communicate wirelessly with a corresponding base station of a 3G mobile communication system, the controller 150 selects and operates the 3G modem unit 120 to control the 3G mobile communication system. Connect with.

The 3G modem unit 120 controls the 3G radio unit 100 to wirelessly connect to a corresponding base station of a 3G mobile communication system, register a location, and perform multimedia-class communication by occupying an allocated radio channel. The wireless output power is controlled by receiving the closed loop power control from the base station of the mobile communication system, and the power control is received as a PDM value.

As described above, a wireless connection with the 3rd generation mobile communication system is received, the PD value of the closed loop power control is controlled to control the output power of the wirelessly transmitted signal, and the mobile communication is performed. When moving, a system handover must be made.

Since the 3G modem unit 120 performs data communication with the 3G mobile communication system through the 3G radio unit 100, base station information of the 2G mobile communication system to be handed over and radio channel information to be allocated are included. Receive system information wirelessly.

The 3G modem unit 120 transmits system information of the wirelessly-generated second generation mobile communication system to the 2G modem unit under the control of the control unit 150, and at the same time, the closed loop finally received from the third generation mobile communication system. The PDM value of the power control is transmitted together.

The control unit 150 controls to select and operate the 2G modem unit 130, and the 2G modem unit 130 controls to operate the 2G radio unit 110, and the corresponding base station of the second generation mobile communication system By occupying the assigned channel, it maintains the current communication status and makes handover wireless connection.

As described above, the 2G modem unit 130 wirelessly connected to the second generation mobile communication system by system handover outputs the PDM value applied from the 3G modem unit 120 to the controller 150 to generate the second generation mobile communication. Request to retrieve the corresponding PDM value appropriately for the system.

The control unit 150 detects the PDM value of the third generation mobile communication system applied as described above, as a corresponding second generation PDM value by searching the table unit 140, and searches for the PDM value. The PD value of the detected second generation mobile communication system is output to the 2G modem unit 130.

The 2G modem 130 receiving the PD value of the second generation mobile communication system detected by the control unit 150 by the table unit 40 search controls the 2G wireless unit 110 to generate the second generation. Outputs a controlled radio signal at an output power level suitable for closed loop power control of a mobile communication system.

That is, the present invention having the above configuration, for example, when the mobile terminal (MS) is handed over from the third generation mobile communication system in the communication to the second generation mobile communication system, or vice versa system In the case of handover, second generation mobile communication is performed by searching the final PD value received from the previously connected 3G mobile communication system without receiving the open loop power control without the position registration at the beginning of system handover. It is detected and applied as a closed loop power control PDM value corresponding to the system.

Therefore, since the wireless signal is output to be received at the same level as other mobile terminals around the wireless connection to the base station of the second generation mobile communication system, there is an advantage that does not affect the signal-to-noise ratio.

Hereinafter, the present invention will be described with reference to the accompanying FIG. 4, and a method for controlling a system handover power of a portable terminal will be described with reference to the accompanying drawings.

When the mobile terminal control unit 150 communicates with the 3rd generation system, the 3G modem unit 120 controls the occupied channel and controls the wireless output power, and wirelessly connects to the 3rd generation mobile communication system. Determining whether to perform multimedia-class communication including an image signal (S100); When the mobile terminal controller 150 of the process (S100) is connected to the 3G mobile communication system and wants to communicate, the 3G modem unit 120 operates and controls the radio channel allocated through the 3G radio unit 100. Multi-process consisting of the step of occupying and mobile communication, receiving a PDM signal by the closed loop (CLOSED LOOP) power control from the third generation mobile communication system, and controlling the wireless output power (S110),

When handing over from the third generation system connected in the multi-process to the second generation system, the corresponding system information is received from the second generation system, and the second generation is generated from the third generation mobile communication system currently connected by the portable terminal controller of the process. Determining whether to handover to the mobile communication system (S120); In the case of handover to the second generation mobile communication system in the step (S120) and the determination process consisting of receiving the system information including the base station information and channel information to be handed over of the second generation mobile communication system (S130),

The portable terminal controller 150 of the determination process transmits the 3G system information and the PDM value received by the 3G modem unit 120 to the 2G modem unit 130 and hands over to the 2G mobile communication system. The 3G modem unit 120 is controlled by the portable terminal controller 150 to avoid system information wirelessly received from the 2nd generation mobile communication system and the closed loop power control last received from the 3rd generation mobile communication system. Transmitting a DM value to the 2G modem unit 130 (S140); The mobile terminal controller 150 of step S140 selects, operates and controls the 2G modem 130 to continue the ongoing communication by occupying the radio channel of the base station (RAN) allocated in the second generation mobile communication system. The movement process consisting of the process (S150),

The mobile terminal controller 150 of the movement process detects the second generation PDM value corresponding to the PDM value finally received by searching the table 140 and registers the corresponding output power and registers the position. The second generation movement corresponding to the PDM value of the closed loop power control finally received from the third generation mobile communication system by the portable terminal controller 150 is searched by searching the table unit 140. Detecting replacement by a PDM value of the communication system (S160); Controlling the wireless output power by controlling the 2G wireless unit 110 of the portable terminal with the PDM value of the second generation mobile communication system detected in the step (S160), and the step of registering the location (S170) It consists of a control process.

Hereinafter, according to the present invention having the configuration described above, a system handover power control method of a portable terminal will be described in detail with reference to the accompanying drawings.

Optionally, when a mobile terminal (MS) communicating wirelessly with a third generation mobile communication system or communicating with a second generation mobile communication system wirelessly communicates with a third generation mobile communication system (S100), the controller 150 controls the 3G modem unit 120 to be selectively operated, and the 3G modem unit 120 controls the 3G radio unit 100 to be allocated by a corresponding base station (RAN) of the third generation mobile communication system. Occupying a wireless channel, performing location registration (LOCATION REGISTRATION), and performs multimedia-class mobile communication with the called party, and receives closed loop power control of the third generation mobile communication system (S110).

Power control of the third generation mobile communication system is controlled by PDM (PULSE DENSITY MODULATION) value, the 3G modem unit 120 of the mobile terminal receiving the closed loop power control PDM value through the analysis The 3G radio unit 100 controls the output power of the radio signal output.

For example, the PDM value by the closed loop power control uses a value from 0 to 511.

When the mobile terminal (MS) connected to the 3rd generation mobile communication system and provided with the corresponding mobile communication service attempts to perform a handover by entering the service area of the 2nd generation mobile communication system (S120), the mobile terminal is in the connected state. Through the third generation mobile communication system, system information including corresponding base station information and channel information to be allocated of the second generation mobile communication system to be handed over is received (S130).

The system information of the second generation mobile communication system as described above is received by the 3G radio unit 100, is applied to the 3G modem unit 120, and is controlled by the controller 150 to the 2G modem unit 130. send.

In addition, the 3G modem unit 120 is finally received from the third generation mobile communication system, and transmits the PD value by the closed loop power control to the 2G modem unit 130 (S140).

When the portable terminal enters the service area of the second generation mobile communication system and wirelessly connects with the base station, the controller 150 performs system handover because the ongoing communication is continued by occupying the assigned channel (S150).

The 2G modem unit 130 is authorized from the 3G modem unit 120, and outputs a closed loop power control PD (PDM) value of the 3G mobile communication system to the control unit 150 in the 2G mobile communication system. The search request is made with a closed loop power control PD of PDM.

The control unit 150 detects the input third generation PDM value as the PDM value corresponding to the second generation mobile communication system by searching the table unit 140, and detects the detected second generation PDM value as the 2G modem unit 130. Output to (S160).

The 2G modem unit 130 inputting the PDM value corresponding to the second generation mobile communication system from the control unit 150 controls the 2G radio unit 110 to output a radio signal with power according to the corresponding value. At the same time, the location registration (LOCATION REGISTRATION) to the second generation mobile communication system (S170).

The second generation mobile communication system normally outputs a closed loop power control PD (PDM) value for the mobile terminal in which the location registration is completed and the communication is in progress, thereby normally performing the output power control of the mobile terminal.

Accordingly, the present invention having the above-described configuration is a value corresponding to the PDM value finally received from the previous system in the initial state in which the mobile terminal is not registered in the newly connected system through the system handover while the communication is in progress. Since it is applied to search and stabilize, the base station system is stabilized, and there is an advantage that does not affect noise to other adjacent mobile terminals.

According to the present invention having the above-described configuration, when the portable terminal handovers from the third generation mobile communication system to the second generation mobile communication system, the output power is controlled to a value corresponding to the finally controlled closed loop power control PD value. There is an industrial use effect to receive the normal output power at the handed over base station.

In addition, since the mobile terminal does not control the output power by the open loop power control received from the mobile communication system in the early stage of system handover, the signal-to-noise ratio is not recognized as noise due to the difference in output power between adjacent mobile terminals. There is a convenient effect on use.

Claims (11)

A 3G modem unit which is operated by selection and controls the processing, transmission and reception of the 3G communication signal, and output power, A 2G modem unit which is operated by selection and controls the corresponding processing, transmission / reception and output power of the second generation communication signal, A control unit connected to the 3G modem unit and the 2G modem unit, and selectively operating by system handover and controlling the output power of the radio signal with the retrieved PD value; A system handover of a mobile terminal, comprising: a table unit configured to access the controller, record and store a PDG value of a 2G system, which is the same as a PDG value of a 3G system, and output a retrieved PDM value. Power control device. According to claim 1, A 3G radio unit wirelessly connecting to the 3rd generation base station at an output power set by the control of the 3G modem unit and wirelessly transmitting and receiving 3rd generation communication signals and system operation data; A 2G radio unit for wirelessly connecting with the 2nd generation base station at the output power set by the control of the 2G modem unit and for wirelessly transmitting and receiving the 2nd generation communication signals and system operation data; And a baseband unit for accessing the control unit and processing a communication signal transmitted and received as a baseband. The method of claim 1, wherein the 3G modem unit, The system handover power control apparatus of the portable terminal, which is operated by selection of the control unit, outputs system operation data received from the base station through the 3G radio unit, and modulates and demodulates the 3G communication signals transmitted and received. . The method of claim 1, wherein the 2G modem unit, The system handover power control apparatus of the portable terminal, which is operated by selection of the control unit, outputs system operation data received from a base station through a 2G radio unit, and modulates and demodulates a second generation communication signal transmitted and received. . The method of claim 1, wherein the control unit, Respectively connected to the 3G modem unit and the 2G modem unit, and selectively operated to connect to a corresponding system that controls a service area. In the case of system handover, the table unit is searched for the currently received power control PDM value. Correspondingly, confirming the power control PD value of the system to be handed over, and applying the identified PD value to the selected modem unit to control the wireless output power. controller. The method of claim 1, wherein the table unit, The PD value controlling the wireless output power of the mobile terminal by the closed loop power control of the third generation base station and the PD value controlling the wireless output power of the mobile terminal by the closed loop power control of the second generation base station are maintained at the same level. The mobile terminal is configured to record and store the information in a table, and to output the PD value of the corresponding system base station to be handed over by a search when the final PD value of the second or third generation base station is inputted. System handover power control device. In the case of access communication to the 3rd generation system by the portable terminal controller, a multi-process of controlling the 3G modem unit to occupy the allocated channel and controlling the wireless output power; A determination process of receiving the corresponding system information from the second generation system when handing over from the connected third generation system to the second generation system; The mobile terminal controller of the above process transfers the 3G system information and the PD value received by the 3G modem unit to the 2G modem unit and performs a handover to the 2G system; The portable terminal controller of the process comprises a control process of detecting a second generation PD value corresponding to the final PD value by searching the table and controlling the output power and registering the position. Way. The method of claim 7, wherein the multi-process, Determining whether to perform a wireless connection to the third generation mobile communication system by a mobile terminal controller and to perform multimedia-class communication including a video signal; When the mobile terminal controller of the above process wants to access and communicate with the 3G system, the 3G modem unit is selected and operated and controlled. Receiving a PD signal, and controlling the wireless output power system handover power control method comprising the step of. The method of claim 7, wherein the determining process, Determining whether to handover from the currently connected 3G mobile communication system to the 2G mobile communication system by the portable terminal controller of the above process; In case of handover to the second generation mobile communication system in the above process, the system handover power of the mobile terminal, comprising receiving system information including base station information and channel information for handover of the second generation mobile communication system. Control method. The method of claim 7, wherein the moving process, The portable terminal controller of the above process controls the 3G modem to transmit the system information wirelessly received from the 2nd generation mobile communication system and the PD value of the closed loop power control finally received from the 3rd generation mobile communication system to the 2G modem unit. Process, The portable terminal control unit of the above process consists of selecting and operating a 2G modem unit and controlling the system to perform ongoing communication by occupying the radio channel of the base station allocated in the second generation mobile communication system and continuing the ongoing communication. Power control method. The method of claim 7, wherein the control process, Replacing and detecting the PD value of the closed loop power control finally received from the third generation mobile communication system by the portable terminal control unit with the PD value of the second generation mobile communication system corresponding to the table unit search; , A method for controlling system handover power of a portable terminal, comprising controlling a wireless output power by controlling a 2G wireless unit of the portable terminal with a PD value of the second generation mobile communication system detected in the above process and registering a location. .

Images