KR100777367B1 - A device and operating methods of power saving with handoff for dual mode mobile-phone - Google Patents

Abstract

A power saving device of a dual-mode terminal and an operation method are provided to prevent unnecessary power consumption by setting an unoperated module to a sleep state and to convert the module into an activated state by handoff control, thereby preventing power consumption and wrong operation. An RF(Radio Frequency) unit(100) selectively transceives an RF signal by being selectively activated. A baseband unit(200) selectively provides power to a CDMA(Code Division Multiple Access) module(210) or a WCDMA(Wideband CDMA) module(250) by a control signal of a central controller(300) to convert one of the CDMA module(210) and the WCDMA module(250) into an activated state, and modulates/demodulates a baseband signal by using the activated module. The controller(300) receives and analyzes CDMA mobile communication network and WCDMA mobile communication network signals, and converts a sleep module into an activated state so that the activated module is handed off, if a signal of the activated module is less than a threshold value.

Description

Power saving device and operation method of dual mode terminal {A DEVICE AND OPERATING METHODS OF POWER SAVING WITH HANDOFF FOR DUAL MODE MOBILE-PHONE}

1 is a functional configuration diagram of a mobile communication network to which the present invention is applied;

2 is a power saving device functional configuration diagram of a dual-mode terminal according to the present invention,

3 is a flowchart illustrating an operation method for handing off from a CDMA module to a WCDMA module of a dual mode terminal according to the first embodiment of the present invention;

4 is a signal flowchart for handing off from a CDMA module to a WCDMA module of a dual mode terminal according to the first embodiment of the present invention;

5 is a flowchart illustrating an operation method for handing off from a WCDMA module to a CDMA module of a dual mode terminal according to a second embodiment of the present invention;

6 is a signal flow diagram for handoff from a WCDMA module to a CDMA module of a dual mode terminal according to a second embodiment of the present invention;

          ** Description of the symbols for the main parts of the drawings **

10: terminal 20: mobile communication network

30: CDMA base station 40: WCDMA base station

50: mobile switching center 60: public network

100: high frequency unit 110: CDMA radio unit

120: WCDMA radio section 200: baseband section

210: CDMA module 220: CDMA modem unit

230, 270: power supply unit 240, 280: switching unit

250: WCDMA module 300: central control unit

The present invention saves power and prevents malfunction by handoff control of a dual-mode terminal, and in particular, sets an inactive module to a sleep state to limit unnecessary power consumption, and activates it by handoff control. The present invention relates to a power saving device and a method of a dual mode terminal for preventing power consumption and malfunction.

The mobile communication network is a wireless terminal that allows a mobile terminal to freely move in a service area and communicate with a desired party anytime, anywhere. From the analog method of communicating using only the first generation (1G) voice signal, a second generation capable of digital data communication is possible. (2G) has evolved digitally, and is now evolving into 3G (3G) capable of multimedia communication.

The multimedia service provided by the third generation mobile communication network includes a voice signal, a multimedia communication including a fax signal, a packet data service, and a video signal.

In addition, the third generation mobile communication network includes a CDMA 2000 system and a W-CDMA system.

The CDMA 2000 scheme, generally called synchronous, is an increase in the capacity of the existing CDMA scheme. There is a 1x version using a 1.25 MHz bandwidth and a 3x version using three times its bandwidth, and the 1x and 3x versions are the same system. Coexist in

The WCDMA method is generally called asynchronous, uses a bandwidth of 5 MHz to 10 MHz, employs 32 Kbps ADPCM (ADAPTIVE DIFFERENTIAL PULSE CODE MODULATION) for voice coding, and moves at a speed of about 100 Km per hour. Communication is possible and is now a true third generation mobile network.

The terminal subscribed to the third generation mobile communication network must have compatibility (COMPATIBILITY) that can be operated by the WCDMA method and the CDMA method, in this case, the terminal has a function of wireless communication by the WCDMA method and the wireless communication by the CDMA method A dual mode structure having all the parts is essential.

The dual-mode terminal is operated in the WCDMA service area in the WCDMA service area, and in the case of moving to the CDMA service area, a handover (HAND-OVER) or hand-off (HAND-OFF) technology for switching or converting to the CDMA method. This applies.

In general, handoff is a technology that allows a call to continue without being disconnected when the terminal moves from one cell or service area of the mobile communication network to another cell.

There are two methods for this handoff: soft handoff (SOFT HAND OFF) and hard handoff (HARD HAND OFF).

In soft handoff, a channel is allocated from a neighboring base station of a handoff target during communication, and the quality of a base station channel currently being serviced is communicated by occupying a plurality of radio channels together with a channel allocated from a currently serving base station. Or, if the channel falls below the threshold, the channel occupancy is released.

In the hard handoff, a radio channel allocated by a base station currently providing mobile communication service is blocked without receiving a channel assignment from a neighboring base station to be handed off during communication. It is a method of occupying and communicating.

The handoff technique has been developed around a synchronous CDMA mobile communication network. However, with the advent of an asynchronous WCDMA mobile communication network, a handoff technology between the synchronous and asynchronous mobile communication networks has been studied.

In response to such a request, a terminal is provided with both a CDMA-type functional unit or a module and a WCDMA-type functional unit or module, and communicates in the service area of a WCDMA-type mobile communication network in the WCDMA mode, and in the service area of a CDMA-type mobile communication network. A dual mode terminal has been developed for communicating in a CDMA manner.

Such a dual mode terminal should be provided with a handoff function for activating by switching or changing a function unit or a module when changing a service area.

In the prior art, since each module of the dual mode terminal requires an operating power source, power consumption is twice as high.

In addition, when the on-off control of the operation power supply of each module by the hand-off control, there was a problem that the power supply and booting is not smooth and malfunction occurs.

Therefore, it is necessary to develop a technology that cuts down or minimizes the operation power supplied to a module that is not activated in a dual mode terminal to save power consumption, and provides a time required for booting when activated.

According to the present invention, when a module operating in an active state of a dual mode terminal receives a base station signal at a level lower than or equal to a predetermined threshold value, the module is set to a sleep state and then switched to an active state by handoff control. It is an object of the present invention to provide a power saving device and method of a dual mode terminal that saves power consumption and provides sufficient time for booting a program to prevent malfunction.

The present invention devised to provide the above object, the high frequency unit having a CDMA wireless unit and a WCDMA wireless unit and selectively activated operation to transmit and receive a high frequency signal; A baseband section connected to the high frequency section, the CDMA module and the WCDMA module being activated from a power saving sleep state by selective power supply to demodulate and demodulate the baseband signal; Connect to the baseband and receive and analyze the CDMA mobile and WCDMA mobile network signals. If the signal of the active module is below the threshold and the signal of the sleep module is above the threshold, the sleep module is activated and set. We present a configuration that includes a central control unit that controls and monitors to be turned off.

In addition, the present invention devised to provide the above object, in the dual-mode terminal consisting of a high frequency unit, a baseband unit and a central control unit and communicating in a CDMA and WCDMA manner, the central control unit CDMA module A first sleep process of activating and communicating with each other, wherein the CDMA module sets a sleep state to save power by power-holding the WCDMA module; A first standby process of controlling a CDMA module to provide a power supply control signal to the WCDMA module if it is determined by the central controller that the CDMA received signal level is smaller than a predetermined threshold value, the WCDMA module setting a standby state; If the data error occurrence rate of the signal received by the WCDMA module by the central control unit is less than the data error occurrence rate of the CDMA module, the WCDMA module is activated by handoff control, and the power supply hold control is performed to power-saving the sleep mode. A configuration including a first activation process to be set is presented.

In addition, the present invention devised to provide the above object, in the dual-mode terminal consisting of a high-frequency unit, a baseband unit and a central control unit and communicating in a CDMA and WCDMA manner, the central control unit is a baseband portion WCDMA module A second sleep process of activating and communicating, wherein the WCDMA module sets a sleep state to save power by power-holding control of the CDMA module; A second standby process of controlling the WCDMA module to provide a power supply control signal to the CDMA module if it is determined by the central controller that the WCDMA received signal level is smaller than a predetermined threshold value, the CDMA module setting a standby state; If the data error occurrence rate of the signal received by the CDMA module by the central control unit is smaller than the data error occurrence rate of the WCDMA module, the CDMA module is activated by handoff control, and the power supply hold control is performed to enter the power saving sleep mode. A configuration including a second activation process to be set is presented.

Hereinafter, according to the present invention having the above configuration, a power saving device and method of a dual mode terminal will be described in detail with reference to the accompanying drawings.

1 is a functional configuration diagram of a mobile communication network to which the present invention is applied, FIG. 2 is a functional configuration diagram of a power saving device of a dual mode terminal according to the present invention, and FIG. 4 is a flowchart illustrating an operation method for handing off from a CDMA module of a dual mode terminal to a WCDMA module according to the first embodiment of the present invention. 5 is a flowchart illustrating a method of operating a handoff from a WCDMA module to a CDMA module of a dual mode terminal according to a second embodiment of the present invention, and FIG. 6 is a flowchart of a dual mode terminal according to a second embodiment of the present invention. Signal flow diagram for handoff from WCDMA module to CDMA module.

In describing the present invention by way of example, unnecessary descriptions of contents that are well known in the art and are not directly related to the description will be omitted, and thus the description will be more clearly transmitted without obscuring the subject matter.

Referring to Figure 1 describes a mobile communication network to which the present invention is applied, the terminal (MS) (10) has both modules of the function that is operated in the CDMA and WCDMA scheme, the module of the wireless environment suitable for the conditions Dual mode to select or handoff wireless connection.

The terminal 10 includes a mobile terminal for mobile communication, a PDA, a notebook computer, a USB modem terminal, a data terminal, and the like.

The mobile communication network 20 includes a CDMA base station 30 which transmits and receives a mobile communication radio signal in a CDMA manner in a formed service area, and a WCDMA base station 40 which transmits and receives a mobile communication radio signal in a WCDMA manner in a service area formed in a separate state. ) And a mobile switching station 50 for establishing a communication path since the switching is performed by the call connection request of the terminal 10 connected through the CDMA base station 30 and the WCDMA base station 40.

When it is confirmed that the communication partner is subscribed to another communication network, the mobile switching center 50 controls the public network 60 including the Internet to set up the corresponding communication path.

For example, the terminal 10 may enter a neighboring service area formed by the WCDMA method while communicating in the CDMA method while freely moving in the service area formed by the CDMA base station 30, or vice versa. In some cases, the WCDMA service area enters an adjacent CDMA service area while communicating in the WCDMA manner.

In this case, the dual mode terminal 10 hands off the WCDMA module to be activated from the state of activating the CDMA module, or hands off the CDMA module to be operated from the state of activating the WCDMA module.

As described above, the dual mode terminal 10 includes modules that are activated and communicate with each other and modules that are deactivated and do not communicate. At this time, the deactivated module does not operate for communication, and thus it is not necessary to supply power or current for operation.

Therefore, in the dual-mode terminal, it is possible to cut off the supply of the operating power to the deactivated module or to operate in the sleep (SLEEP) state that consumes the minimum current, to save unnecessary power consumption is the present technology.

In addition, before operating from the sleep state to the active state, the standby state is passed, thus providing a sufficient timing for booting necessary programs to operate normally, and the power is unstable by stable on-off switching control. It is a technique of the present invention to ensure that no supply is made.

Referring to Figure 2, the power switching device of the dual-mode terminal according to the present invention, a high frequency unit 100 consisting of a CDMA wireless unit 110 and a WCDMA wireless unit 120; A baseband unit 200 comprising a CDMA module 210 for processing and modulating a CDMA baseband signal and a WCDMA module 250 for processing and modulating a WCDMA baseband signal; The central control unit 300 is configured to control and monitor the CDMA module and the WCDMA module to select an active operation state as handoff.

The CDMA module 210 includes a CDMA modem unit 220, a power supply unit 230, and a switching unit 240. The WCDMA module 250 includes a WCDMA modem unit 260 and a power supply unit 270. And a switching unit 280.

Referring to FIG. 3, a description will be given of an operation method of handing off from a CDMA module of a dual mode terminal to a WCDMA module according to the first embodiment of the present invention. A first sleep process of operating and holding the module in a sleep state by controlling the power supply; A first waiting process of providing a power supply signal to the WCDMA module and setting a conversion to a standby state when the CDMA signal is received below a predetermined threshold value; A first activation process of controlling the conversion setting of the WCDMA module to the active state and controlling the conversion setting to the sleep state by power-holding controlling the CDMA module when the handoff control state is confirmed; It is configured to include.

4 and 2, a signal flow state of handoff from the baseband CDMA module of the dual mode terminal according to the first embodiment of the present invention to the WCDMA module will be described. ) Is set and operated in an activated state by a power enable signal of the WCDMA module 250 and an activation control signal of the central controller 300.

As such, the CDMA module 210 operating in the active state provides a power hold (PS_HOLD) control signal to save power consumed by the WCDMA module 250 operating in the inactive state, thereby bringing the WCDMA module into a sleep state. Set up and operate.

The sleep state is a state in which the supply of the operating power is turned off or a state in which the minimum operating power is supplied.

At this time, the CDMA module 210 provides a power enable signal to the WCDMA module 250 under the control of the central controller 300 which determines that the level of the CDMA received signal is equal to or less than the set threshold.

Therefore, the WCDMA module 250 is set to the standby state with the normal operating power supplied, and the time for loading and booting the necessary operating program is secured.

When the WCDMA module 250 in such a standby state is provided with an activation control signal from the central control unit 300, the WCDMA module 250 is operated in an active state and provides a power hold (PS_HOLD) control signal to the CDMA module. The power consumed by setting is saved.

Thus, the handoff process from the CDMA module to the WCDMA module is completed.

Referring to FIG. 5, a method of handing off from a WCDMA module to a CDMA module of a dual mode terminal according to the second embodiment of the present invention will be described. The WCDMA module is initially operated by the central controller and is activated. A second sleep process of operating the module in a sleep state by controlling the power supply hold; A second standby step of providing a power supply control signal to the CDMA module and setting the standby state when the WCDMA signal is received below a predetermined threshold value; A second activation process of converting and controlling the CDMA module into an active state when the handoff control state is determined and providing a power hold control signal to the WCDMA module to control the transition setting to the sleep state; It is configured to include.

Referring to FIG. 6, the description of the signal flow for handing off from the WCDMA module of the dual mode terminal according to the second embodiment of the present invention to the CDMA module is based on a direction opposite to that of the first embodiment of FIG. 4. Similar procedures and procedures will be repeated, so duplicate explanations will not be given.

Hereinafter, with reference to the accompanying Figures 1 to 6, the power saving device and method of the dual-mode terminal will be described in detail.

According to the first embodiment, with reference to FIGS. 1 to 4, a hand generated while the terminal 10 moves from the service area formed by the CDMA base station 30 into the service area formed by the WCDMA base station 40. Explain the off state.

By the initial state of the terminal 10, the central control unit 300 controls the baseband unit 200 to operate in an activated state of supplying normal operating power to the CDMA module 210, and operates the CDMA module ( The 210 operates the CDMA radio unit 110 constituting the high frequency unit 100 in an activated state (S100).

As such, the CDMA module 210 of the baseband unit 200 controlled to activate the CDMA module from the central control unit 300 is set to be activated, and a power hold (PS_HOLD) control signal is transmitted to the WCDMA module 250 in an inactive state. It is to be set and operated in the sleep state.

The WCDMA module in such a sleep state is in a state in which the supply of operating power is turned off or the minimum operating power required for operation is supplied.

Since the normal operating power is supplied by the control and monitoring of the central control unit 300 in the initial state, the CDMA module 210 operating in the activated state provides the power hold signal PS_HOLD to the WCDMA module 250, thereby operating. Blocking the supply of power or controlling to operate in a sleep (SLEEP) state that consumes the minimum operating power (S110).

As described above, the minimum operating power consumption includes cutting off the supply of the operating power to the OFF state.

The CDMA modem unit 220 of the CDMA module 210 operated in the activated state applies a power hold (PS_HOLD) control signal to the switching unit 280 of the WCDMA module 250.

The switching unit 280 controls the power supply unit 270 to supply the minimum operating power to the WCDMA modem unit 260.

At this time, the minimum operating power includes, in some cases, cutting off the operating power supply to the OFF state.

In this way, the WCDMA modem unit 260 supplied with the minimum operating power from the power supply unit 270 is operated in a sleep state.

At this time, since the central controller 300 analyzes the CDMA signal wirelessly received through the CDMA modem unit 220, the central controller 300 checks whether the reception level of the CDMA radio signal is smaller than the predetermined threshold value (S120).

When the level of the CDMA system signal wirelessly received is lower than the threshold set as described above, the central controller 300 controls the CDMA module 210 of the baseband unit 200 to set the WCDMA module 250 to a standby state. Ask.

Upon receiving the request signal, the CDMA module 210 provides a power supply control signal to the switching unit 280 of the WCDMA module 250.

Since the switching unit 280 controls the power supply unit 270 to supply the normal operating power to the WCDMA modem unit 260, the WCDMA modem unit 260 is supplied with the normal operating power and loads a necessary program to boot. The standby state to be set is stably set by sufficient time (S130).

At this time, since the central control unit 300 analyzes the received signal of the corresponding CDMA base station 30 provided from the CDMA module 210, confirms the increase state of the data error occurrence rate, and from the CDMA base station 30 by such confirmation Check whether the normal communication can be performed by using the signal received wirelessly.

That is, the central controller 300 checks whether the current CDMA module 210 needs to be handed off to the WCDMA module 250 (S140).

When it is confirmed and determined that the handoff should be performed by the central control unit 300, the central control unit 300 controls the WCDMA module 250 to be set to an active state, and thus the CDMA module 210 is deactivated. Is set.

The WCDMA module 250 activates and controls the WCDMA radio unit 120 of the high frequency unit 100 to wirelessly connect the WCDMA base station 40 of the mobile communication network 20 in a WCDMA manner, thereby wirelessly transmitting and receiving mobile communication signals. Control monitoring and operation (S150).

At this time, the WCDMA module 250 operated in the active state provides a power hold (PS_HOLD) control signal to the CDMA module 210 in order to save current consumed by the CDMA module 210 operated in the inactive state, This signal is supplied to the switching unit 240 of the CDMA module 210.

The switching unit 240 controls switching of the power supply unit 230 so that the minimum operating power is supplied to the CDMA modem unit 220 or cut off in the off state so that the operating power is not supplied. The CDMA modem unit 220 that is supplied with power or cut off from the supply of operating power is set to a sleep state (S160).

Thus, handoff is made from the CDMA module 210 of the terminal to the WCDMA module 250.

Hereinafter, according to the second embodiment, with reference to Figs. 1 and 2 and 5 and 6, the CDMA base station 30 is configured from the service area formed by the WCDMA base station 40 in the terminal 10 in the initial state. The handoff state occurring while moving into the service area to be formed will be described.

Since the same apparatus as in the first embodiment is used and there is a difference in the signal processing process, in order to simplify the description, overlapping processes will not be repeated.

The WCDMA module 250 is operated in an activated state by controlling and monitoring the central control unit 300 in an initial state (S200).

In this way, since the WCDMA module 250 operating in the active state provides the power hold (PS_HOLD) control signal to the CDMA module 210 operated in the inactive state, the sleep of the CDMA module does not consume or consume the minimum operating power. It is operated in the state (S210).

That is, the mobile communication proceeds with the WCDMA signal by the WCDMA module.

The central controller 300 analyzes the WCDMA signal received from the WCDMA module 250 and checks whether it is smaller than a predetermined threshold level (S220).

When the level value of the signal received by the WCDMA method is smaller than the predetermined threshold value, the central controller 300 controls the WCDMA module 250 so that the CDMA module 210 operating in the sleep state is set to the standby state. Watch.

Since the WCDMA module 250 receives the request, the power supply control signal POWER ENABLE is provided to the CDMA module 210, so that the CDMA modem unit 220 of the CDMA module 210 operates normally from the power supply unit 230. The standby state is set by receiving power and booting by loading necessary operating programs and data (S230).

At this time, the central controller 300 analyzes the data signal processed by the WCDMA module 250 and checks the increase of the error occurrence rate.

That is, whether the wireless communication with the WCDMA base station 40 to continue the communication or the state to be hand-off to the CDMA module 210 to the wireless connection with the CDMA base station 30, and to communicate with the CDMA signal (S240).

In this confirmation, when it is confirmed that the handoff is to be performed, the central control unit 300 controls and monitors the CDMA module 210 in the standby state to be in an activated state.

Since the CDMA module 210 controlled in the activated state is wirelessly connected to the CDMA base station 30 through the CDMA radio unit 110, mobile communication by handoff is continued (S250).

At this time, since the CDMA module 210 operating in the active state provides the power hold (PS_HOLD) control signal to the WCDMA module 250 operating in the inactive state, the WCDMA module 250 has a power consumption of minimum or operating power. The sleep state in which the supply is cut is set and operated (S260).

That is, due to such a configuration, the dual-mode terminal 10 is handed off from the WCDMA module 250 to the CDMA module 210, saves the power consumed, and the time required for the necessary program by the standby state is sufficient. It has the advantage of being loaded and booted with stable operation.

Therefore, as in the first and second embodiments, the dual mode terminal 10 is deactivated and not operated for communication, the module consumes minimum power, or the operating power is supplied within a range that does not interfere with the entire operation of the terminal. Since the supply is cut off, unnecessary power is not consumed, thereby saving power of the terminal.

In addition, since each module is set to the standby state before being set and operated in the active state by the handoff, the normal operation power is supplied, sufficient time for booting is allocated, and there is an advantage of operating stably.

Such a configuration according to the present invention is to supply the normal operating power to the module that is activated and operated in the dual-mode terminal, the supply of the operating power to the module operating inactive, or the minimum operating power for the normal operation of the terminal By supplying, it has the advantage of blocking unnecessary power consumption.

In addition, during the operation from the sleep state to the active state, through the standby state, to ensure the time that the operating power is stably supplied to the module activated by the handover, the problem of boot failure caused by the power on and off There is an advantage to block.

In another embodiment, a method may be provided in which each switching unit includes a timer configuration by a hardware RC circuit to ensure a constant time from the sleep state to the active state.

Although the present invention has been described in the above embodiments, the present invention is not necessarily limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

The present invention having the configuration described above, because the operating power supplied to the module inactive operation of the dual-mode terminal is suppressed, and the power management can be efficiently managed to increase the operating time, there is a convenience effect in use to increase the reliability and preference of the product. .

In addition, since the module operated in the sleep state is operated in the active state through the standby state, since the unstable operation due to power on or off or sufficient time for booting is provided sufficiently, the malfunction of the terminal by the handoff control is prevented. There is an industrial use effect to improve the reliability.

Claims (15)

A high frequency unit having a CDMA radio unit and a WCDMA radio unit and selectively activated to transmit and receive high frequency signals; Connect to the high frequency unit, selectively supply power to a CDMA module or a WCDMA module according to a control signal of a central controller, and convert either of the CDMA module or the WCDMA module into an active state and use the activated module A baseband unit for modulating and demodulating the baseband signal; Central to connect with the baseband unit, receive and analyze the CDMA mobile communication network and the WCDMA mobile communication network signal, and if the signal of the activated module is below the threshold value, converts the sleep state module into the active state to control and monitor the handoff. Control unit; Power saving device of a dual mode terminal configured to include. The method of claim 1, wherein the baseband portion, A WCDMA module configured to set a sleep state by applying a power hold control signal to a CDMA module in an active operation state by control and monitoring of the central control unit, or set it to an active state by applying a power supply control signal; A CDMA module configured to set a sleep state by applying a power hold signal to a WCDMA module in an active operation state by controlling and monitoring the central controller, or to set an active state by applying a power supply control signal; Power saving device of a dual mode terminal, characterized in that comprises a. The method of claim 2, wherein the WCDMA module, A WCDMA modem unit configured to be activated by a normal supply of operating power, to modulate or demodulate a WCDMA baseband signal, and to provide a power supply control signal or a power hold control signal to a CDMA module by control of a central controller; A power supply unit which is connected to the WCDMA modem unit and cuts off or supplies operating power for slip operation or activation operation by a control signal of a switching unit; A switching unit connected to the power supply unit for switching control and monitoring of an operation power supply for slip operation or activation operation by a control signal of a CDMA module; Power saving device of a dual mode terminal, characterized in that comprises a. The method of claim 2, wherein the CDMA module, A CDMA modem unit configured to be activated by a normal supply of operating power, to modulate or demodulate a CDMA baseband signal, and to provide a power supply control signal or a power hold control signal to a WCDMA module under control of a central controller; A power supply unit connected to the CDMA modem unit and cutting off or supplying operating power for slip operation or activation operation by a control signal of a switching unit; A switching unit connected to the power supply unit for switching control and monitoring of an operation power supply for slip operation or activation operation by a control signal of a WCDMA module; Power saving device of a dual mode terminal, characterized in that comprises a. The method of claim 1, wherein the terminal, A mobile terminal for a mobile communication, PDA, notebook, USB modem terminal, power saving device of a dual mode terminal, characterized in that it comprises a data terminal. The method according to claim 3 or 4, The WCDMA modem unit or CDMA modem unit, The power saving device of the dual-mode terminal, characterized in that the configuration for transmitting a signal capable of analyzing and confirming the signal level and data error occurrence rate received by the corresponding radio section of the high frequency section. The method of claim 1, wherein the central control unit, If the received signal level of the active module among the baseband CDMA module and the WCDMA module is smaller than a predetermined threshold value, the module currently set to the sleep state is set to the standby state, and the data error occurrence rate of the active module is predetermined. The power saving device of the dual-mode terminal, characterized in that the configuration is configured to control and monitor the hand-off and activation operation when the module exceeds the threshold value. In the dual-mode terminal consisting of a high frequency unit, a baseband unit and a central control unit and communicating by CDMA and WCDMA method, A first sleep process in which the central control unit activates and communicates with the CDMA module of the baseband unit, and the CDMA module is set to a power saving sleep state by power holding control of the WCDMA module; A first waiting process of requesting a CDMA module to provide a power supply control signal to a WCDMA module if the CDMA received signal level is determined to be smaller than a predetermined threshold by the central controller, wherein the WCDMA module sets a standby state; A first activation process of when the data error occurrence rate of the CDMA module is greater than a threshold value by the central controller, handoff control to activate the WCDMA module, and power-hold control of the CDMA module to set a power saving sleep mode; Power saving device operation method of a dual mode terminal configured to include. The method of claim 8, wherein the first slip process, Operating the communication by controlling the CDMA module of the baseband unit to an active state by the central controller; Supplying a power hold control signal to a WCDMA module by the CDMA module; Operating the WCDMA module in a sleep state consuming a minimum current; Power saving device operating method of the dual-mode terminal, characterized in that it is included. The method of claim 8, wherein the first waiting process, Confirming, by the central controller, whether a level value of a signal received from a CDMA module is smaller than a predetermined threshold value; If the received signal level of the CDMA module is less than a threshold, controlling the CDMA module to set the WCDMA module to a standby state; Providing a power supply control signal to a WCDMA module by the CDMA module; The WCDMA module being supplied with a normal operating current and set to a standby state; Power saving device operating method of the dual-mode terminal, characterized in that it is included. The method of claim 8, wherein the first activation process, Comparing, by the central controller, an error occurrence rate of a data signal provided from the CDMA module with a set threshold value; If the error occurrence rate of the data provided by the CDMA module is greater than a threshold, determining that the handoff is performed; If it is determined that the handoff is made, setting a WCDMA module to an active state; Providing a power hold control signal to a CDMA module by the activated WCDMA module; Setting a sleep state in which the CDMA module consumes a minimum current; Power saving device operating method of the dual-mode terminal, characterized in that it is included. In the dual-mode terminal consisting of a high frequency unit, a baseband unit and a central control unit and communicating by CDMA and WCDMA method, A second sleep process in which the central control unit activates and communicates with the WCDMA module of the baseband unit, and the WCDMA module sets a power saving sleep state by controlling power holding of the CDMA module; A second waiting process of requesting a WCDMA module to provide a power supply control signal to a CDMA module if the WCDMA received signal level is determined to be smaller than a predetermined threshold by the central controller, wherein the CDMA module sets a standby state; A second activation process of, when the data error occurrence rate of the WCDMA module is greater than a threshold by the central controller, handoff control to activate and activate the CDMA module, and power-hold control of the WCDMA module to set a power saving sleep mode; Power saving device operation method of a dual mode terminal configured to include. The method of claim 12, wherein the second slip process, Operating the communication by controlling the WCDMA module of the baseband unit in an activated state by the central controller; Supplying a power hold control signal to a CDMA module by the WCDMA module; The CDMA module is operated in a sleep state consuming a minimum current; Power saving device operating method of the dual-mode terminal, characterized in that it is included. The method of claim 12, wherein the second waiting process, Confirming, by the central controller, whether a level value of a signal received from a WCDMA module is smaller than a predetermined threshold value; If the received signal level of the WCDMA module is less than a threshold, controlling the WCDMA module to set the CDMA module to a standby state; Providing a power supply control signal to a CDMA module by the WCDMA module; The CDMA module being supplied with a normal operating current and set to a standby state; Power saving device operating method of the dual-mode terminal, characterized in that it is included. The method of claim 12, wherein the second activation process, Comparing, by the central controller, an error occurrence rate of a data signal provided from the WCDMA module with a set threshold value; If the error occurrence rate of the data provided by the WCDMA module is greater than a threshold, determining that the handoff is performed; If it is determined that the handoff is performed, setting a CDMA module to an active state; Providing a power hold control signal to a CDMA module by the activated CDMA module; Setting a sleep state in which the WCDMA module consumes a minimum current; Power saving device operating method of the dual-mode terminal, characterized in that it is included.

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