KR100638551B1 - Method and apparatus for providing idle handover - Google Patents

Abstract

The present invention relates to a method and apparatus for performing a standby handover from a synchronous system to a WCDMA system, and more particularly, to a method and apparatus for performing a handover when a mobile terminal transitions from a synchronous system to a WCDMA system in a standby state. The method includes receiving a base class from a synchronous system in a synchronous mode, activating a WCDMA modem corresponding to the base class, acquiring a network from a WCDMA system using a WCDMA modem, and entering a standby state, and a synchronous modem. Off to convert from synchronous mode to WCDMA mode.

WCDMA system, synchronous

Description

Method and apparatus for providing idle handover             

1 is a view for explaining a standby handover procedure according to the prior art.

2 is a flowchart schematically illustrating a procedure for performing a standby handover according to an embodiment of the present invention.

3 is a view for explaining a standby handover method according to an embodiment of the present invention.

4 is a view for explaining a process of setting a condition for a standby handover and a back off time condition from a WCDMA system to a synchronous system according to an embodiment of the present invention.

5 is a signal flow diagram illustrating a procedure for performing a standby handover from a synchronous system to a WCDMA system according to an embodiment of the present invention.

6 is a signal flow diagram illustrating a procedure for performing a standby handover from a WCDMA system to a synchronous system according to an exemplary embodiment of the present invention.

7 illustrates parameters in a SIB 3 message according to one preferred embodiment of the present invention.

8 is a diagram for describing parameter values indicating a back off time condition for a standby handover from a synchronous system to a WCDMA system according to an exemplary embodiment of the present invention.

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

301: WCDMA Cell

303: WCDMA Border Cell

305: Synchronous System Cell

401 UE (User Equipment)

403: Universal Terrestrial Radio Access Network (UTRAN)

The present invention relates to a method and apparatus for making a standby handover from a synchronous system to a WCDMA system, and more particularly to a method and apparatus for handover when a mobile terminal transitions from a synchronous system to a WCDMA system in a standby state.

In general, handover (handoff) refers to changing a call path to a moved cell in order to maintain a call when the mobile terminal moves out of the cell area to another cell. The mobile terminal compares the threshold for the pilot channel strength received from the base station with the pilot channel strengths of other neighboring base stations that it continues to measure. If at some point the comparison of these measurements indicates a value that requires handover, the mobile terminal reports it to the mobile communication network and performs handoff under control of the responsible system according to the type of handoff. On the other hand, the change of the base station during the waiting for reception, i.e., the idle state, is called idle handover. Referring to FIG. 1, the procedure for performing the standby handover is as follows.

1 is a diagram illustrating a standby handover procedure according to the prior art.

Referring to FIG. 1, the horizontal axis represents the traveling direction of a mobile station (MS), and the vertical axis represents the strength (Ec / Io) of the pilot signal. When the mobile terminal moves from Cell 1 to Cell 2, the Ec / Io 101 of the pilot signal of Cell 1 gradually decreases, and the Ec / Io 103 of the pilot signal of Cell 2 gradually increases. In this case, the mobile terminal in comparison with the Ec / Io 101 of the pilot signal of Cell 1 and the Ec / Io 103 of the pilot signal of Cell 2 compares the Ec / Io 103 of the pilot signal of Cell 2 with the cell 1 of Cell 1. A standby handover to Cell 2 is performed at a point 105 that is greater than 3 dB greater than the Ec / Io 101 of the pilot signal. This standby handover is for standby handover within the same system and does not apply to standby handovers that differ from system to system, such as moving from asynchronous to synchronous systems.

The 3GPP standard, which is an international standard for WCDMA systems, is based on the Global System for Mobile Communication (GSM) system, which is the second-generation asynchronous system, and the standards related to interworking with the IS-95 series, which is a synchronous system, are still in progress. to be. On the other hand, since domestic mobile communication systems are based on synchronous systems, in order to provide convenience to users of WCDMA systems, which are difficult to establish nationwide networks in the early stages of commercial WCDMA implementations, Idle Handover or Roaming functions are implemented with existing synchronous systems. There is a need to do so.

An object of the present invention to solve the above problems is to provide a method and apparatus for performing a standby handover from a synchronous system to a WCDMA system.

Another object of the present invention is to provide a method and apparatus for performing an optimal standby handover by setting a back off time according to parameters in an SIB 3 message received in a standby state and adjusting an internal timer of a mobile terminal. will be.

Another object of the present invention is to provide a method and apparatus for minimizing changes in existing mobile terminals and systems, and performing standby handover that does not require a separate network construction such as a beacon.

In order to achieve the above objects, according to an aspect of the present invention, there is provided a method for performing a standby handover from the synchronous system to the WCDMA system in a mobile terminal which includes a WCDMA modem and a synchronous modem, and which is combined with a WCDMA system and a synchronous system. Receiving a base class from the synchronous system in a synchronous mode, activating the WCDMA modem corresponding to the base class, and entering a standby state by registering a location with the WCDMA system using the WCDMA modem. And turning off the synchronous modem to switch from the synchronous mode to the WCDMA mode, thereby providing a standby handover from the synchronous system to the WCDMA system.

The method further includes receiving a back off time condition from a WCDMA system in the WCDMA mode, wherein the mobile terminal performs a standby handover to a synchronous system because the signal of the WCDMA system is weak. In case of receiving, after the back off time elapses, a standby handover is performed to the WCDMA system.

In a preferred embodiment, the back off time condition is received through a SIB 3 message in a WCDMA mode idle state. In addition, the back off time is characterized in that it is designed to increase exponentially with the number of attempts to register the location in the WCDMA system in the synchronous mode standby state. In addition, the synchronous modem is characterized in that the CDMA 1X modem. The base class may be a signal for instructing to perform a standby handover from a synchronous system to a WCDMA system.

According to another aspect of the present invention, a method for performing a standby handover from the synchronous system to the WCDMA system in a synchronous modem included in a mobile terminal combined with a WCDMA system and a synchronous system, the method comprising: receiving a base class from a synchronous system Transmitting a WCDMA modem activation request signal to a controller included in the mobile terminal in correspondence with the base class, wherein the controller activates a WCDMA modem included in the mobile terminal in response to the WCDMA modem activation request signal. The WCDMA modem enters a standby state by registering a location with the WCDMA system, receiving a first standby state indication signal from the control unit, wherein the first standby state indication signal is transmitted by the controller to the standby state entry. A second correspondingly received from the WCDMA modem And a step of transmitting a terminal mode change request signal to the control unit, wherein the control unit turns off the synchronous modem to change the state of the mobile terminal from synchronous mode to WCDMA mode. It is possible to provide a method for performing standby handover from a synchronous system to a WCDMA system characterized by converting.

According to another aspect of the present invention, a method for performing a standby handover from the synchronous system to the WCDMA system in a WCDMA modem included in a mobile terminal combined with a WCDMA system and a synchronous system, the control unit included in the mobile terminal Receiving a first WCDMA modem activation request signal, wherein the first WCDMA modem activation request signal is a second WCDMA modem activation transmitted by the synchronous modem included in the mobile terminal to the controller by receiving a base class from the WCDMA system; Corresponding to a request signal, activating by the first WCDMA modem activation request signal, entering a standby state by registering a location with the WCDMA system, and entering a standby state by the controller when entering a standby state; Transmitting an indication signal, wherein the controller Transmits a second standby state indication signal to the synchronous modem in response to the first standby state indication signal, receives a terminal mode change request signal from the synchronous modem, and then turns off the synchronous modem to turn off the mobile station. There is provided a method for performing a standby handover from a synchronous system to a WCDMA system, characterized in that the state of the terminal is converted from the synchronous mode to the WCDMA mode.

According to another aspect of the present invention, a mobile terminal comprising a WCDMA modem and a synchronous modem, wherein the mobile terminal performs a standby handover from the synchronous system to the WCDMA system in combination with a WCDMA system and a synchronous system, the synchronous system in a synchronous mode. Means for receiving a base class from the network, means for activating the WCDMA modem corresponding to the base class, means for entering a standby state by registering a location with the WCDMA system using the WCDMA modem, and turning off the synchronous modem. It is possible to provide a mobile terminal comprising a means for converting from synchronous mode to WCDMA mode.

According to another aspect of the present invention, in a synchronous modem included in a mobile terminal combined with a WCDMA system and a synchronous system to perform a standby handover from the synchronous system to the WCDMA system, means for receiving a Base Class from the synchronous system, Means for transmitting a WCDMA modem activation request signal to a controller included in the mobile terminal in accordance with the base class, wherein the controller activates the WCDMA modem included in the mobile terminal in response to the WCDMA modem activation request signal, A WCDMA modem enters a standby state by registering a location with the WCDMA system-means for receiving a first standby state indication signal from the control unit, where the first standby state indication signal corresponds to the standby state entry. Second standby received from the WCDMA modem And means for transmitting a terminal mode change request signal to the controller, wherein the controller turns off the synchronous modem to convert the state of the mobile terminal from synchronous mode to WCDMA mode. A synchronous modem can be provided.

According to another aspect of the present invention, a WCDMA modem included in a mobile terminal combined with a WCDMA system and a synchronous system to perform a standby handover from the synchronous system to the WCDMA system, the first control unit comprising: Means for receiving a WCDMA modem activation request signal, wherein the first WCDMA modem activation request signal is a second WCDMA modem activation request signal transmitted by the synchronous modem included in the mobile terminal to the controller after receiving a base class from the WCDMA system; Means for activating by the first WCDMA modem activation request signal, means for entering a standby state by registering a location with the WCDMA system, and a first standby state indication signal to the controller when entering a standby state. Means for transmitting the, wherein the control unit is The second standby state indication signal is transmitted to the synchronous modem in response to the first standby state indication signal, and after receiving the terminal mode change request signal from the synchronous modem, the synchronous modem is turned off. A WCDMA modem can be provided that converts a state from a synchronous mode to a WCDMA mode.

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

2 is a flowchart schematically illustrating a procedure of performing a standby handover according to an exemplary embodiment of the present invention. Here, the idle handover refers to a handover when the mobile terminal moves from the synchronous system to the WCDMA system in the standby state.

Referring to FIG. 2, first, a mobile terminal according to the present invention enters an idle state in a CDMA 1X mode (step 201). The mobile terminal is based on a Multi Mode Multi Band (MMMB) including a WCDMA modem and a CDMA 1X modem, and can operate in a WCDMA mode and a CDMA 1X mode. In this specification, for convenience of description, a WCDMA modem and a CDMA 1X modem will be described as an example, but a WCDMA modem means a modem supporting an asynchronous system, and a CDMA 1X modem means a modem supporting a synchronous system. In addition, WCDMA mode means that only the WCDMA modem is active, and CDMA 1X mode means that only the CDMA 1X modem is activated.

When the mobile terminal moves from the CDMA 1X system area to the WCDMA system area, the mobile terminal receives a WCDMA Overlay On Indicator (Base Class) from the CDMA 1X system (step 203). Here, the base class is a signal indicating that the WCDMA system is a serviceable area. When the mobile station receives the base class, the mobile terminal performs a standby handover (handoff) from the CDMA 1X system to the WCDMA system.

The mobile terminal activates the WCDMA modem according to the received base class (step 205). The WCDMA modem attempts to enter the Idle State through a network acquisition procedure from the WCDMA system in the activated state (step 207). Here, acquiring a network from a WCDMA system means that after the WCDMA modem is activated, it registers its location by exchanging an initial signal with the WCDMA system, for example, the mobile terminal selects a mobile communication network. And public cell location (PLMN) selection, cell selection, and location registration. This process is one of the well-known processes performed by exchanging an initial signal with the WCDMA system after the WCDMA modem is activated. It is obvious to those skilled in the art that acquiring the network means that detailed descriptions are omitted. Use in the sense. If the entry into the standby state is successful in step 207, the mobile terminal performs step 209, and returns to step 203 if the entry into the standby state fails. In step 207, if the mobile terminal attempts to enter the standby state and starts the timer and fails to enter the standby state for a predetermined time, the mobile terminal may be considered to have failed to enter the standby state. In step 209, the mobile terminal turns off the CDMA 1X modem to switch from the CDMA 1X mode to the WCDMA mode.

When the mobile terminal which performs the standby handover from the CDMA 1X system to the WCDMA system by the above process satisfies the standby handover condition to the CDMA 1X system because the strength of the WCDMA signal is weak, the CDMA 1X system according to the procedure described in FIG. Will perform a standby handover. When the mobile terminal receives the base class, the mobile terminal performs the standby handover from the CDMA 1X system to the WCDMA system again. If this phenomenon is repeated, the mobile terminal will be incapable of calling by causing a continuous ping-pong phenomenon unless a separate supplementary algorithm is applied. To prevent this, the mobile station receives the back off time condition in the WCDMA mode standby state, and attempts the standby handover according to the back off time in performing the standby handover from the CDMA 1X standby state to the WCDMA standby state. The back off time here is preferably designed to increase exponentially. The back off time condition is received by the mobile terminal through a SIB 3 message in a WCDMA standby state, and the back off time value is as follows.

Back off Time = X ⁿ * T_d

Where X is an exponent value used to set the back off time period in exponential form (exponentially), and n is the number of attempts to acquire a WCDMA system network while staying in CDMA 1X standby state. T_d means the basic unit time of back off time.

3 is a view for explaining a standby handover method according to an embodiment of the present invention.

Referring to FIG. 3, a standby handover according to the present invention is a WCDMA system in a standby state of a synchronous system when the mobile terminal enters an area of cells 301 and 303 of a WCDMA system from a cell 305 region of a synchronous system. It means to switch to standby state. This standby handover will be performed in the area of the cell 301, 303 of the WCDMA system, especially in the border cell 303. In addition, a standby handover procedure is required in the cell 301 area of the WCDMA system to ensure the continuity of the service even in the shadow area of the cell 301 area of the WCDMA system.

Of course, the area of the cells 301 and 303 of the WCDMA system is also included in the service area of the synchronous system, but the standby handover according to the present invention is assumed to be a mobile terminal that gives priority to the WCDMA system among the synchronous and WCDMA systems. Therefore, even when the signal strength of the synchronous system is not weak, when the mobile terminal enters the cells 301 and 303 of the WCDMA system, the mobile terminal needs to perform a standby handover from the synchronous system to the WCDMA system. At this time, the synchronous system transmits a WCDMA Overlay On Indicator (Base Class) to the mobile terminal, and the mobile terminal receiving the base class performs a standby handover from the synchronous system to the WCDMA system.

Even if the mobile terminal is in the WCDMA standby state in the cells 301 and 303 of the WCDMA system, it ensures the continuity of the service of the subscriber in the shaded area of the cell 301 of the WCDMA system, and the subscriber is the edge cell 303 of the WCDMA system. In addition, a procedure for performing a standby handover from a WCDMA system to a synchronous system is also required in consideration of the case of moving out of the region of FIG. 9), which will be described in detail with reference to FIG. 6.

In addition, in order to prevent continuous handover between the WCDMA system and the synchronous system where the signal strength of the WCDMA system is weak, it is necessary to have a constant back off time when performing the standby handover from the synchronous system to the WCDMA system. The condition for this back off time is set by the RAT (Radio Access Technology) LIST in the SIB 3 message according to the 3GPP standard of WCDMA.

4 is a diagram illustrating a process of setting a condition for performing a standby handover and a back off time condition in a synchronous system in a WCDMA system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the Universal Terrestrial Radio Access Network (UTRAN) 405 transmits a System Information Block Type 3 (SIB 3) message to a user equipment (401) in a standby state (step 405). Here, the UE 401 refers to a mobile terminal performing a standby handover to a WCDMA system according to the present invention as a synchronous system, and the UTRAN 403 refers to a base station (BS) and a base station controller (RNC) of a WCDMA system. Means.

The condition for the standby handover from the WCDMA system to the synchronous system and the back off time condition for implementing the standby handover from the synchronous system to the WCDMA system are set by the parameter values in the SIB 3 message. The SIB 3 message is defined by the 3GPP standard and is a message that can be received when the WCDMA modem of the mobile station stays in an idle state, and includes cell selection and re-selection information. The SIB 3 message will be described in detail with reference to FIG.

5 is a signal flow diagram illustrating a procedure for performing standby handover according to an exemplary embodiment of the present invention.

Referring to FIG. 5, a mobile terminal (MS) according to the present invention includes a WCDMA modem (asynchronous modem), a control unit and a CDMA 1X modem (synchronous modem), and the mobile terminal includes two modes of WCDMA mode and CDMA 1X mode. It operates in priority to WCDMA mode. In WCDMA mode, only the WCDMA modem is activated. In CDMA 1X mode, only the CDMA 1X modem is activated. The control unit controls the activation and deactivation of the WCDMA modem and the CDMA 1X modem. In the present specification, the mobile terminal is described based on MMMB (Multi Mode Multi Band), but may be designed as a 1 chip modem in the future. At this time, there is no change in the internal signal of the mobile terminal and the signal between the terminal and the system.

When the mobile terminal enters the WCDMA system service area in the CDMA 1X standby state, the mobile terminal receives a WCDMA Overlay On Indicator (Base Class) from the CDMA 1X system (step 501). The CDMA 1X modem transmits a WCDMA modem activation signal (WCDMA Modem On) to the control unit (step 503). The control unit transmits the received WCDMA modem activation signal (WCDMA Modem On) to the WCDMA modem to activate the WCDMA modem (step 505).

The WCDMA modem attempts to enter the standby state by acquiring the network from the WCDMA system (step 507). The WCDMA modem entering the standby state transmits the result to the idle state indication signal (Idle State Indication) to the control unit (step 509), and the control unit transmits the result to the CDMA 1X modem (step 511). At this time, the mobile terminal sets a timer (Tacdma) for Idle State Indication and if the Idle State Indication is not received before the timer expires, the mobile terminal deactivates the WCDMA modem (off) and returns to step 501 to continue the Base Class. Check

Upon receiving the standby state indication signal, the CDMA 1X modem transmits a terminal mode change request signal (Mode change to WCDMA) to the control unit (step 513). The control unit switches the mode of the mobile terminal from the CDMA 1X mode to the WCDMA mode by turning off the CDMA 1X modem according to the terminal mode change request signal, and puts the result in a terminal mode change response signal to WCDMA. Transmit to modem (step 515).

6 is a signal flow diagram illustrating a procedure for performing standby handover from a WCDMA system to a synchronous system according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the standby handover procedure from the WCDMA system to the synchronous system begins with the assumption that the mobile terminal is in the WCDMA mode standby state. In the standby state, the mobile terminal receives a standby handover condition from the WCDMA system through a SIB 3 message (step 601). At this time, the mobile terminal also receives a condition of the back off time for handover from the synchronous system to the WCDMA system. Here, the standby handover condition and the back off time condition will be described in detail with reference to FIGS. 7 and 8.

The WCDMA modem determines whether the signal strength of the WCDMA system satisfies the standby handover condition (step 602). If the standby handover condition is satisfied as a result of the determination, the WCDMA modem transmits a CDMA 1X modem activation signal (CDMA 1X Modem On) to the control unit (step 603). The control unit transmits the received CDMA 1X modem activation signal (CDMA 1X Modem On) to the CDMA 1X modem to activate the CDMA 1X modem (step 605).

The CDMA IX modem receives pilot signals and sync signals from the CDMA IX system (synchronous system) and attempts to enter a standby state (step 607). The CDMA 1X modem entering the standby state transmits the result to the idle state indication signal (Idle State Indication) to the controller (step 609), and the controller transmits the result to the WCDMA modem (step 611). At this time, the mobile terminal sets a timer (Taw) for Idle State Indication and if the Idle State Indication is not received before the timer expires, the mobile terminal deactivates (off) the CDMA 1X modem and returns to step 601 to continuously wait. Check whether the handover condition is satisfied. In addition, if the CDMA 1X modem processes outgoing / incoming calls before processing Idle State Indication, the CDMA 1X modem is off and the WCDMA modem is given priority. Check whether it satisfies.

Upon receiving the wait state indication signal, the WCDMA modem transmits a terminal mode change request signal to the control unit (step 613). The controller converts the mode of the mobile terminal from WCDMA to CDMA 1X mode by deactivating the WCDMA modem according to the terminal mode change request signal, and transmits the result to the terminal mode change response signal to the WCDMA modem (step 615). ).

7 illustrates parameters in an SIB 3 message according to an embodiment of the present invention.

Referring to FIG. 7, the SIB 3 message of the 3GPP standard is a message that the mobile terminal receives from the WCDMA system in a standby state, and includes cell selection and re-selection information. The SIB 3 message includes several parameters. For the standby handover according to the present invention, the RAT List 701, the RAT identifier 703, the S _{search, the RAT} 705, the S _{HCS, the RAT} 707, and the S _{limit are used. , searchRAT} 709 is used. At this time, the RAT identifier 703 is set to cdma2000, and maxOtherRAT of the RAT List 701 is set to 3 to secure an area of a parameter to be transmitted from the network. maxOtherRAT can be extended as needed due to future improvements to the standby handover algorithm. A value of 1 for the RAT List 701 is used for parameter setting indicating a condition of a back off time for handover from the CDMA 1X standby state to the WCDMA standby state. The specific parameter values will be described in FIG. 8. Values 2 and 3 of the RAT List 701 indicate a condition for standby handover from the WCDMA system to the synchronous system. That is, they are used to transmit a threshold and time-to-trigger condition by RSCP, Ec / Io, respectively, to the mobile terminal. At this time, the value of S _{HCS, RAT} 707 represents a threshold condition, and the value of S _{limit, searchRAT} 709 represents a time-to-trigger condition.

FIG. 8 is a diagram for describing parameter values indicating a back off time condition for a standby handover from a synchronous system to a WCDMA system according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the standby handover between the WCDMA system and the synchronous system is repeatedly performed in a region where the strength of the WCDMA signal is weak, thereby performing the standby handover from the synchronous system to the WCDMA system in order to prevent the mobile terminal from making a call. When you follow a certain cycle. Back off time means this period. In this case, the back off time has a value of X ⁿ * T_d, where X is an exponent value used to set the back off time period in the form of an exponential function, and n is a WCDMA system network while staying in the CDMA 1X standby state. It means the number of attempts to acquire, and T_d means the basic unit time of the back off time.

The mobile terminal receives the setting value of the information element transmitted from the network and applies the value to the corresponding application without modification. If the value of the RAT List is set to 3, this indicates that it is a back off time condition. S _{search, RAT} represents an exponent value X. When S _{search, RAT} is set to 3, the mobile terminal applies this value as the value of X and uses it. S _{HCS, RAT} represents the maximum value of n, and when S _{HCS, RAT} is set to 6 and transmitted, the mobile terminal applies this value to the maximum value of n as it is. S _{limit and searchRAT} represent T_d _{, which} is a basic unit time, and the S _{limit and searchRAT} values may correspond to specific T_d values as shown in Table 1 below.

S _{limit, searchRAT} T_d (sec) Remarks -16 No negative value -15 ㅇ -One 0 5 One 10 2 20 3 40 4 60 5 120 6 300 7 600 8 1800 9 3600 10 7200

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

According to the present invention, a method and apparatus for performing standby handover from a synchronous system to a WCDMA system can be provided.

According to the present invention, the optimal standby handover can be performed by setting the back off time according to the parameters in the SIB 3 message received in the standby state and adjusting the internal timer of the mobile terminal.

According to the present invention, changes to existing mobile terminals and systems can be minimized, and standby handover can be performed without a separate network construction such as a beacon.

Claims (11)

1. A method of making a standby handover from the synchronous system to the WCDMA system in a mobile terminal comprising a WCDMA modem and a synchronous modem, wherein the mobile terminal is coupled to a WCDMA system and a synchronous system. Receiving a Base Class from the synchronous system in a synchronous mode; Activating the WCDMA modem according to the base class; Entering a standby state by registering a location with the WCDMA system using the WCDMA modem; And Turning off the synchronous modem to convert from synchronous mode to WCDMA mode And a standby handover from a synchronous system to a WCDMA system. The method of claim 1, Receiving a back off time condition from a WCDMA system in the WCDMA mode Include more, When the mobile terminal receives a base class after performing a standby handover to a synchronous system because the signal of the WCDMA system is weak, performing a standby handover to the WCDMA system after the back off time has elapsed. And a standby handover from a synchronous system to a WCDMA system. The method of claim 2, The back off time condition is received through a SIB 3 message in a WCDMA mode idle state. And a standby handover from a synchronous system to a WCDMA system. The method of claim 2, The back off time is designed to increase in the form of an exponential function according to the number of attempts to register a location with the WCDMA system in a synchronous mode standby state. And a standby handover from a synchronous system to a WCDMA system. The method of claim 1, The synchronous modem is a CDMA 1X modem And a standby handover from a synchronous system to a WCDMA system. The method according to claim 1 or 2, The base class is a signal instructing to perform a standby handover from a synchronous system to a WCDMA system. And a standby handover from a synchronous system to a WCDMA system. A method for performing a standby handover from the synchronous system to the WCDMA system in a synchronous modem included in a mobile terminal coupled with a WCDMA system and a synchronous system, the method comprising: Receiving a base class from a synchronous system; Transmitting a WCDMA modem activation request signal to a controller included in the mobile terminal in correspondence with the base class, wherein the controller activates the WCDMA modem included in the mobile terminal in response to the WCDMA modem activation request signal; A WCDMA modem enters a standby state by registering a location with the WCDMA system; Receiving a first standby state indication signal from the controller, wherein the first standby state indication signal corresponds to a second standby state indication signal received by the controller from the WCDMA modem in response to entering the standby state; ; And Transmitting a terminal mode change request signal to the controller; Including but not limited to: The control unit turns off the synchronous modem to change the state of the mobile terminal from synchronous mode to WCDMA mode And a standby handover from a synchronous system to a WCDMA system. A method for performing a standby handover from the synchronous system to the WCDMA system in a WCDMA modem included in a mobile terminal coupled with a WCDMA system and a synchronous system, the method comprising: Receiving a first WCDMA modem activation request signal from a control unit included in the mobile terminal, wherein the first WCDMA modem activation request signal is obtained by receiving a base class from the WCDMA system by a synchronous modem included in the mobile terminal; Corresponding to the second WCDMA modem activation request signal sent to the mobile station; Activating by the first WCDMA modem activation request signal; Entering a standby state by registering a location with the WCDMA system; And Transmitting a first standby state indication signal to the controller when entering a standby state Including but not limited to: The control unit transmits a second standby state indication signal to the synchronous modem in response to the first standby state indication signal, receives a terminal mode change request signal from the synchronous modem, and then turns off the synchronous modem. Converting the state of the mobile terminal from synchronous mode to WCDMA mode And a standby handover from a synchronous system to a WCDMA system. A mobile terminal comprising a WCDMA modem and a synchronous modem, wherein the mobile terminal performs standby handover from the synchronous system to the WCDMA system in combination with a WCDMA system and a synchronous system, Means for receiving a Base Class from the synchronous system in a synchronous mode; Means for activating the WCDMA modem corresponding to the Base Class; Means for entering a standby state by registering a location with the WCDMA system using the WCDMA modem; And Means for turning off the synchronous modem to convert from synchronous mode to WCDMA mode Mobile terminal comprising a. A synchronous modem included in a mobile terminal combined with a WCDMA system and a synchronous system to perform a standby handover from the synchronous system to the WCDMA system, Means for receiving a Base Class from a synchronous system; Means for transmitting a WCDMA modem activation request signal to a controller included in the mobile terminal in accordance with the base class, wherein the controller activates the WCDMA modem included in the mobile terminal in response to the WCDMA modem activation request signal, A WCDMA modem enters a standby state by registering a location with the WCDMA system; Means for receiving a first standby state indication signal from the control unit, wherein the first standby state indication signal corresponds to a second standby state indication signal received by the control unit from the WCDMA modem in response to entering the standby state; ; And Means for transmitting a terminal mode change request signal to the controller Including, The control unit turns off the synchronous modem to change the state of the mobile terminal from synchronous mode to WCDMA mode A synchronous modem, characterized in that. A WCDMA modem included in a mobile terminal coupled with a WCDMA system and a synchronous system to perform a standby handover from the synchronous system to the WCDMA system, Means for receiving a first WCDMA modem activation request signal from a control unit included in the mobile terminal, wherein the first WCDMA modem activation request signal is obtained by receiving a base class from the WCDMA system by a synchronous modem included in the mobile terminal; Corresponding to the second WCDMA modem activation request signal sent to the mobile station; Means for activating by said first WCDMA modem activation request signal; Means for entering a standby state by registering a location with the WCDMA system; And Means for transmitting a first standby state indication signal to the controller when entering a standby state Including, The control unit transmits a second standby state indication signal to the synchronous modem in response to the first standby state indication signal, receives a terminal mode change request signal from the synchronous modem, and then turns off the synchronous modem. Converting the state of the mobile terminal from synchronous mode to WCDMA mode WCDMA modem characterized in that.

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