KR101140149B1 - Method and System for Hand-over by Using Multimode-Multiband Terminal in Mobile Communication Environment - Google Patents

Abstract

The present invention relates to a method and system for handover of a multimode multiband terminal in a mobile communication environment.

The present invention provides a CDMA-2000 system including a base station transmitter and a base station controller and provides a CDMA-2000 service to a terminal requesting connection, and a WCDMA system including a RTS and an RNC and providing a WCDMA service to a terminal requesting the access. A method for handover of a multimode multi-band terminal in a mobile communication environment in which a call quality is prevented from being degraded by suppressing idle handover occurrence in a mobile communication system, the method comprising: (a) transmitted from the WCDMA system via a WCDMA modem; Receiving an WCDMA signal and measuring an Ec / Io value; (b) turning on and entering the idle state of the CDMA-2000 modem according to the result of step (a); (c) requesting a handover to the WCDMA system; (d) receiving a handover command from the WCDMA system; And (e) turning off the WCDMA modem and switching a call link to the CDMA-2000 system via the CDMA-2000 modem. A handover method of a multiband terminal is provided.

According to the present invention, a handover success rate is prevented in a multimode multiband terminal attempting handover because an idle handover occurring in an idle state before receiving a handover command from a wireless base station that first requested a handover is prevented. There is an advantage to increase the call quality.

Multimode-Multiband Terminals, Handover, CDMA-2000, WCDMA

Description

Method and System for Hand-over by Using Multimode-Multiband Terminal in Mobile Communication Environment}

1 is a diagram schematically illustrating a mobile communication system for providing a WCDMA service in a communication environment in which a CDMA-2000 system is basically constructed;

2 is a block diagram schematically showing an internal configuration of a multi-mode multi-band terminal according to a preferred embodiment of the present invention;

3 is a simplified diagram of a mobile communication system for forming a call link with a multimode multi-band terminal according to a preferred embodiment of the present invention;

4 is a flowchart illustrating a handover procedure of a multi-mode multi-band terminal according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110, 300: multi-mode multi-band terminal 120: CDMA-2000 region

130, 140: overlay area 210: antenna

220: RF transceiver 230: CDMA modem unit

232: CDMA-2000 filter 234: CDMA-2000 modem

240: WCDAM modem unit 242: WCDMA filter                 

244 WCDMA modem 250 control unit

260: program storage unit 310: wireless access network

312 base station transmitter 314 base station controller

320: mobile communication switching center 330: RAN

332: RTS 334: RNC

The present invention relates to a handover method and system for a multimode-multiband terminal in a mobile communication environment. More specifically, the present invention relates to a method and system for handover of a multimode-multiband terminal in a mobile communication environment in which a call quality is prevented from being degraded by suppressing idle handover in a mobile communication system including a CDMA-2000 system and a WCDMA system. It is about.

The mobile communication service has been continuously developed starting from the low quality voice call-oriented first generation mobile communication service provided by the analog cellular Advanced Mobile Phone Service (AMPS), which has been in service since the late 1980s. Second-generation mobile communication services enable enhanced voice calls and low-speed (14.4 Kbps) data services provided by digital cellular Global System for Mobile (GSM), Code Division Multiple Access (CDMA), and Time Division Multiple Access (TDMA). It was. In addition, in the 2.5th generation mobile communication service, the PCS (Personal Communication Service), which can be used worldwide in addition to securing the frequency in the GHz band, has been developed to enable improved voice call and low speed (144 Kbps) but data service.

Mobile communication networks for mobile communication services up to the 2.5th generation include a user terminal, a base station transmitter, a base station controller, a mobile communication switching center, a home location register (HLR), and a visitor location register (VLR). Communication equipment is installed.

The third generation mobile communication service is classified into asynchronous WCDMA system proposed by 3GPP (3rd Generation Partnership Project) and synchronous CDMA-2000 system proposed by 3GPP2. In particular, the WCDMA system is a wireless protocol recommended by IMT-2000, and many telecommunication service providers around the world are providing or preparing to provide services.

WCDMA system not only has excellent call quality but also uses spread spectrum method, which is suitable for large data transmission. The WCDMA communication method adopts 32 Kbps Adaptive Differential Pulse Code Modulation (ADPCM) for voice coding, and supports high mobility enough to make a call even if the user moves at a speed of about 100 Km / h. In addition, WCDMA communication is adopted by most countries, and 3GPP, which is composed of many organizations such as Korea, Europe, Japan, the United States, and China, is continuously developing technical specifications for WCDMA.

On the other hand, recently, due to the advantages of the WCDMA system described above, even in countries such as Korea, the United States, and China, which basically provide CDMA-2000 services, WCDMA systems have started to provide WCDMA services.

1 is a diagram schematically illustrating a mobile communication system for providing a WCDMA service in a communication environment in which a CDMA-2000 system is basically constructed.

In CDMA-2000 region 120 providing CDMA-2000 services, WCDMA services are provided in some regions within CDMA-2000 region 120. In the process described below, it is assumed that the regions provided with the WCDMA service in the CDMA-2000 region 120 are the overlay regions 130 and 140. That is, the mobile communication subscriber may selectively receive a desired one of the CDMA-2000 service and the WCDMA service in the overlay regions 130 and 140. In order to use the CDMA-2000 service and the WCDMA service, the multi-mode multi-band terminal 110 is required.

Multimode-Multiband (MM-MB) terminal 110 is a mobile communication terminal that supports both multimode and multiband. Here, the multimode includes a synchronous mode and an asynchronous mode, and the multiband includes a second generation mobile communication service using a frequency band of 800 MHz, a second generation mobile communication service using a frequency band of 1.8 GHz, approximately 2 GHz A third generation mobile communication service using the frequency band and a frequency band of the fourth generation mobile communication service to be serviced in the future. The multi-mode multi-band terminal 110 operates by switching between the WCDMA mode and the CDMA-2000 mode according to the type of communication service provided in the region where it is located.

When the mobile communication subscriber moves out of the overlay area 130 to the CDMA-2000 area 120, the multi-mode multi-band terminal 110 performs handover. Handover means maintaining a call link between the multimode-multiband terminal 110 and the mobile communication system even if the service area is changed.

In the overlay area 130, the multimode-multiband terminal 110 forms a call link with the WCDMA system. However, upon entering the CDMA-2000 coverage area 120, the multimode-multiband terminal 110 switches the call link to the CDMA-2000 system through the switching between the WCDMA modem and the CDMA 2000 modem.

However, in the conventional handover process, the multi-mode multi-band terminal 110 has a problem of generating an idle handover. Idle handover refers to an attempt to handover with a wireless base station of another cell located in an adjacent area before receiving a handover command from the wireless base station of the cell that originally requested the handover. In the mobile state, if an idle handover occurs between the multimode multi-band terminal 110 and the mobile communication system, it is difficult to maintain a call link and has a disadvantage of causing a call disconnection.

In order to solve the above problems, the present invention provides a multi-mode in a mobile communication environment that improves handover success rate and improves call quality by preventing idle handover in the process of receiving a mobile communication service using a multimode-multiband terminal. An object of the present invention is to provide a handover method and system for a multiband terminal.

Accordingly, according to a first object of the present invention, a CDMA-2000 system including a base station transmitter and a base station controller and providing a CDMA-2000 service to a terminal requesting connection, RTS (RTS: Radio Transceiver Subsystem, hereinafter 'RTS') Call) by suppressing the occurrence of idle handover in a mobile communication system including a WCDMA system that provides a WCDMA service to a terminal requesting the connection and includes an RNC (RNC: Radio Network Controller (RNC)). A method for handover of a multimode multi-band terminal in a mobile communication environment to prevent deterioration of quality, (a) receiving a WCDMA signal transmitted from the WCDMA system through a WCDMA modem and receiving an Ec / Io (Energy of Carrier / Interference) of Others, hereinafter referred to as 'Ec / Io' value; (b) turning on and entering the idle state of the CDMA-2000 modem according to the result of step (a); (c) requesting a handover to the WCDMA system; (d) receiving a handover command from the WCDMA system; And (e) turning off the WCDMA modem and switching a call link to the CDMA-2000 system via the CDMA-2000 modem. A handover method of a multiband terminal is provided.

According to a second object of the present invention, there is provided a CDMA-2000 system for providing a CDMA-2000 service, including a base station transmitter and a base station controller, and a terminal for requesting the connection. A multimode-multiband terminal that prevents degradation of call quality by suppressing idle handover in a mobile communication system including a WCDMA system that provides a WCDMA service, which transmits and receives an RF signal through an air interface. antenna; An RF transceiver for transmitting and receiving and demodulating the RF signal; A CDMA-2000 filter for extracting only a desired CDMA signal among RF signals of a CDMA-2000 band from the RF transceiver; A CDMA-2000 modem for call processing the CDMA signal according to a protocol defined in CDMA-2000; A WCDMA filter for extracting only a desired WCDMA signal from the RF signal of the WCDMA band from the RF transceiver; A WCDMA modem for processing the WCDMA signal according to a protocol defined in WCDMA; A control unit controlling to operate by selecting one of a WCDMA mode and a CDMA-2000 mode; And a program storage unit equipped with a real time operating system (OS) and an idle handover prevention program.

According to a third object of the present invention, there is provided a CDMA-2000 service and a WCDMA service to a multi-mode multi-band terminal, and a mobile communication system which prevents deterioration of call quality by suppressing idle handover occurrence. A wireless access network arranged in units of cells and providing the CDMA-2000 service through a traffic channel among signal channels; A RAN arranged in units of cells and providing the WCDMA-2000 service through a traffic channel among signal channels; And a mobile communication switching center performing basic and additional service processing, incoming and outgoing call processing of a subscriber, location information registration procedure and handover procedure, interworking with other networks, and interworking with the wireless access network and the RAN. A mobile communication system is provided.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are designated as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a block diagram schematically showing an internal configuration of a multi-mode multi-band terminal according to a preferred embodiment of the present invention.

The multi-mode multi-band terminal includes an antenna 210, an RF transceiver 220, a CDMA modem 230, a WCDMA modem 240, a controller 250, a program storage 260, and the like.

The antenna 210 receives an RF signal transmitted from a wireless base station in an adjacent area, transmits the RF signal to the RF transceiver 220, receives a modulated RF signal from the RF transceiver 220, and transmits the RF signal to a radio wave space.

The RF transceiver 220 demodulates the RF signal received from the antenna 210 and converts the demodulated RF signal into a CDMA-2000 filter 232 of the CDMA modem unit 230 or a WCDMA filter of the WCDMA modem unit 240 ( 242). Of course, the RF transceiver 220 receives the transmission data to be transmitted from the CDMA modem unit 230 or the WCDMA modem unit 240, modulates the RF data into an RF signal, and then modulates the modulated RF signal through the antenna 210. It also performs the function of sending by.

The CDMA modem unit 230 includes a CDMA-2000 filter 232 and a CDMA-2000 modem 234 for CDMA-2000 service. The CDMA-2000 filter 232 extracts only the digital signal of the CDMA-2000 band from the RF signal demodulated from the RF transceiver 220 according to the operation mode of the multi-mode multi-band terminal and transfers it to the CDMA-2000 modem 234. do. In addition, the CDMA-2000 modem 234 performs call processing on the CDMA-2000 band digital signal transmitted through the CDMA-2000 filter 232 according to the protocol defined in the CDMA-2000.

The WCDMA modem unit 240 includes a WCDMA filter 242 and a WCDMA modem 244 for a WCDMA service. The WCDMA filter 242 extracts only the digital signal of the WCDMA band from the RF signal demodulated from the RF transceiver 220 according to the operation mode of the multimode multi-band terminal and transmits the digital signal to the WCDMA modem 244. In addition, the WCDMA modem 244 processes digital signals in the WCDMA band passed through the WCDMA filter 242 and performs call processing in accordance with protocols defined in WCDMA.

The controller 250 controls the overall operation of the multi-mode multi-band terminal. The control unit 250 controls the multi-mode multi-band terminal in the WCDMA mode or the CDMA-2000 according to the received RF signal type (WCDMA signal or CDMA-2000 signal). Control to operate by selecting one of the modes. In addition, when a specific operation mode is selected, a control signal is transmitted to the CDMA modem unit 230 or the WCDMA modem unit 240 to control the corresponding specific modem among the CDMA-2000 modem 234 and the WCDMA modem 244 to be started. .

The program storage unit 260 includes an electrically erasable programmable read-only memory (EEPROM), a flash memory, a random access memory (RAM), and the like. It is mounted in (not shown). The flash memory includes a real time operating system (OS), an idle handover prevention program, and the like, which are loaded and loaded into RAM and driven.

The idle handover prevention program calculates an Ec / Io value using a CDMA-2000 pilot signal received through the antenna 210 and the RF transceiver 220, and based on the calculated result, the Ec / Io value is increased. It refers to software for requesting handover to a wireless base station transmitting a large pilot signal. In addition, the idle handover prevention program controls the idle handover not to occur until the handover command is received from the wireless base station of the cell requesting the handover.

Here, Ec / Io (Energy of Carrier / Interference of Others) is used as a unit representing the quality of the pilot signal as a ratio of the pilot signal strength to the magnitude of all received noise. In general, the Ec / Io value is about -1 to -2 dB in areas with low call volume and no overlapping radio waves, about -6 to -12 dB in areas with high traffic volume and overlapping radio waves, and about-in high-rise buildings with overlapping radio waves. It has a value of about 10 dB. In addition, when the Ec / Io value starts to drop from -10 to -14 dB, the phone disconnection phenomenon occurs.

That is, in the present invention, the control unit 250 drives the idle handover prevention program mounted in the program storage unit 260, requests handover through the driven idle handover prevention program, and wirelessly requests the handover. Before receiving the handover command from the base station, the pilot signal transmitted from the wireless base station of the neighbor cell is monitored to control not to generate an idle handover.

3 is a simplified diagram of a mobile communication system for forming a call link with a multimode multi-band terminal according to a preferred embodiment of the present invention.

A mobile communication system for forming a call link with a multimode multi-band terminal 300 according to a preferred embodiment of the present invention includes a multi-mode multi-band terminal 300, a wireless access network 310, a RAN 330 and a mobile communication. Switching center 320;

In the present invention, the multi-mode multi-band terminal 300 is a mobile communication terminal supporting both multi-mode and multi-band, and is equipped with an idle handover prevention program. Accordingly, the multimode-multiband terminal 300 does not generate an idle handover until it receives a handover command from the wireless base station of the cell requesting the handover, that is, in an idle state.

The radio access network 310 is a component of the mobile communication system supporting the CDMA-2000 service. The wireless access network 310 includes a base station transmitter 312, a base station controller 314, and is connected to the mobile communication switching center 320.

The base station transmitter 312 is arranged in units of cells, receives a call request signal from the multimode-multiband terminal 300 through a traffic channel among signal channels, and receives the received call request signal. Location information registration is performed to determine the location of the multi-mode multi-band terminal 300 which is transmitted to the base station controller 314 or existing in the cell area under its control. In addition, the base station transmitter 312 is a network endpoint device that is directly connected to the multi-mode multi-band terminal 300 by performing baseband signal processing, wired and wireless conversion, and transmission and reception of wireless signals.

The base station controller 314 controls the base station transmitter 312 and allocates and releases radio channels for the multimode multiband terminal 300, and transmits outputs of the multimode multiband terminal 300 and the base station transmitter 312. Performs control, soft cell-to-cell soft handover and hard hand-over decision, transcoding and vocoding, GPS clock distribution, operation and maintenance of base stations do.

The base station controller 314 also transmits subscriber information of the location information registered multimode-multiband terminal 300 to the mobile communication switching center 320. The base station controller 314 transfers the call request signal transmitted from the multimode-multiband terminal 300 through the base station transmitter 312 to the mobile communication switching center 320, and vice versa. It transmits the call request signal transmitted from 320 to the multi-mode multi-band terminal 300 through the base station transmitter 312.

The mobile communication switching center 320 performs basic and additional service processing, incoming and outgoing call processing of a subscriber, location information registration procedure and handover procedure, interworking with other networks, and the like. The mobile communication switching center 320 of the IS-95 / A / B / C system includes an access switching subsystem (ASS) that performs distributed call processing, an INS (interconnection network subsystem) that performs centralized call processing, and operation. And a subsystem such as a Central Control Subsystem (CCS) in charge of the centralization of maintenance, and a Location Registration Subsystem (LRS) that performs storage and management of information on mobile subscribers.

In addition, the mobile switching center 320 for the third and fourth generation may include an Asynchronous Transfer Mode (ATM) switch (not shown). The ATM switch increases the transmission speed and the efficiency of line use by transmitting packets on a cell basis. Let's do it.                     

RAN (RAN) (hereinafter referred to as RAN) 330 is a mobile communication system supporting WCDMA service (RTS: Radio Transceiver Subsystem (RTS)) 332, RNC (RNC). Radio network controller (hereinafter referred to as 'RNC') 334 and the like, and are connected to the mobile communication switching center 320.

The RTS 332 includes a Base Station Intercommection Subsystem (BIS), a Base Band Subsystem (BBS), an RF Subsystem (Radio Frequency Subsystem), and the like, and the terminal conforms to the 3GPP radio access standard. And performs wireless access termination function and transmit / receive voice and video data by WCDMA method and transmit / receive information to / from terminal through transmit / receive antenna.

RNC (RNC: Radio Network Controller) 334 is a wired / wireless channel management (Resource Management), terminal protocol matching, base station protocol matching and control processing function, soft hand off processing, core network protocol processing, GPRS (GPRS: General Packet Radio Service) And wireless base station and wireless control station management functions such as lur access, system loading, and fault management.

The overall operation of the present invention is described below, and it is assumed that the multimode-multiband terminal 300 first establishes a call link in the RAN 330 providing WCDMA service. When the mobile subscriber operates the multi-mode multi-band terminal 300, the multi-mode multi-band terminal 300 is automatically received and assigned as a signal channel among 333 channels (operating bandwidth of 10 MHz). Cycle through the two set-up channels. At this time, a setup channel having a relatively high propagation force among 21 setup channels is selected and tuned to the channel frequency. That is, since all of the neighboring wireless base stations are assigned different setting channels, tuning to a setting channel having a relatively high propagation force means that the multi-mode multi-band terminal 300 uses the closest wireless base station to establish a call link. Means to select.

This state is not in a call but can be answered at any time by calling the multimode multi-band terminal 300 from the wireless base station, and the subscriber is ready to transmit a signal immediately when the subscriber wants to make a call. Regardless of the intention, the call preparation of the multi-mode multi-band terminal 300 is automatically completed.

Then, when the mobile subscriber moves to the wireless access network 310 providing the CDMA-2000 service, the multi-mode multi-band terminal 300 transfers the call link formed in the WCDMA system through the switching between the WCDMA modem and the CDMA 2000 modem. Handover to switch to the -2000 system.

Here, the present invention is a multi-mode multi-band terminal 300 so that the idle handover does not occur in the idle state before receiving the handover command from the wireless base station requesting the handover of the plurality of wireless base stations providing the CDMA-2000 service. To control the operation of

4 is a flowchart illustrating a handover procedure of a multi-mode multi-band terminal according to a preferred embodiment of the present invention.

In the following process, it is assumed that the multi-mode multi-band terminal 300 establishes a call link in the overlay region 110 and moves to the CDMA-2000 region 120.

When the multimode-multiband terminal 300 moves from the overlay area 110 to the CDMA-2000 service area 120, a switch between the WCDMA mode and the CDMA-2000 mode is required. That is, the multimode-multiband terminal 300, which has been provided with WCDMA service in the overlay region 110, switches to the CDMA-2000 mode from the WCDMA mode when it moves to the CDMA-2000 region 120.

The controller 250 of the multi-mode multi-band terminal 300 generates an ON parameter for activating the CDMA-2000 modem 234 and transmits it to the CDMA-2000 modem 234 (S400). The CDMA-2000 modem 234 received the on parameter performs an initialization operation (S402). Here, the initialization operation refers to creating an environment for setting information necessary for the operation of the multi-mode multi-band terminal 300 and then transitioning to an idle state. The initialization operation consists of a system decision substate, a pilot channel acquisition substate, and a sync channel acquisition substate.

After completing the initialization, the CDMA-2000 modem 234 monitors pilot signals transmitted from a plurality of wireless base stations located in the CDMA-2000 region 120, and detects a wireless base station having a large radio wave force (S404). The CDMA-2000 modem 234 that detects the radio base station having a large propagation force generates a handover start parameter and transmits it to the WCDMA modem 244 (S406).

The WCDMA modem 244 that has received the handover start parameter determines to perform handover and requests a handover by transferring the handover start parameter to the WCDMA system (S408). Here, the controller 250 drives the idle handover prevention program and controls not to generate the idle handover before receiving the handover command from the wireless base station through the driven idle handover prevention program.

The WCDMA system receiving the handover start parameter from the multi-mode multi-band terminal 300 generates a handover command and transmits it to the multi-mode multi-band terminal 300 (S410), and the multi-mode multi-band terminal 300 ) Controls the CDMA-2000 modem 234 to switch from the idle state to the traffic state (S412).

The CDMA-2000 modem 234 performs an initialization operation for switching to a traffic state (S414), and performs a synchronization operation through a reverse link with a wireless base station to form a call link (S416). In step S416, the CDMA-2000 modem 234 that has finished synchronization with the corresponding wireless base station generates a handover completion message (HCM) indicating that the handover has been completed and transmits it to the wireless base station (S418). The multi-mode multi-band terminal 300, which has finished synchronization with the CDMA-2000 system, turns off the startup of the WCDMA modem 244 and associates the vocoder with the CDMA-2000 modem 234, thereby providing a CDMA-2000 modem ( The call is started through step 234 (S420).

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

As described above, according to the present invention, in the case of a multi-mode multi-band terminal attempting handover, an idle handover occurring in an idle state that is in a state before receiving a handover command from a wireless base station that first requested a handover is prevented. This increases the handover success rate and improves call quality.

Claims (24)

A handover method of a multimode-multiband terminal in a mobile communication system including a CDMA-2000 system and a WCDMA system, (a) measuring an Ec / Io (Ec / Io) value by receiving a WCDMA signal transmitted from the WCDMA system through a WCDMA modem; (b) turning on and entering the idle state of the CDMA-2000 modem according to the result of step (a); (c) requesting a handover to the WCDMA system and operating an idle handover prevention program to control an idle handover to not occur until a handover command is received; (d) receiving a handover command from the WCDMA system; And (e) turning off the WCDMA modem and switching a call link to the CDMA-2000 system via the CDMA-2000 modem; Handover method of a multi-mode multi-band terminal in a mobile communication environment comprising a. The method of claim 1, The multi-mode multi-band terminal is equipped with an idle handover prevention program, and the multi-mode in the mobile communication environment, characterized in that for switching the communication link through the switching between the WCDMA modem and the CDMA-2000 modem when moving the service area; Handover method of multiband terminal. The method according to claim 1 or 2, The idle handover prevention program checks the Ec / Io value, determines a handover based on the checked result, and requests a handover to the WCDMA system. Handover method. The method of claim 1, wherein in step (a) The multi-mode multi-band terminal handovers the multi-mode multi-band terminal in a mobile communication environment, characterized in that periodically receiving a WCDMA signal by periodically searching for a common pilot channel (CPICH) of the WCDMA system Way. The method of claim 1, wherein in step (a) The WCDMA modem measures the Ec / Io value and generates an on parameter for requesting the activation of the CDMA-2000 modem according to the measurement result. The handover method of the multi-mode multi-band terminal in a mobile communication environment. . The method of claim 5, The measurement result is a case in which the Ec / Io value is maintained while maintaining the condition time required to turn on the CDMA-2000 modem, the handover method of a multi-mode multi-band terminal in a mobile communication environment. The method of claim 1, wherein step (b) (b1) receiving a parameter from the WCDMA modem; (b2) performing initialization of the CDMA-2000 modem; (b3) monitoring a CDMA signal transmitted from the CDMA-2000 system and detecting a wireless base station of a cell transmitting the CDMA signal having a large propagation force; And (b4) generating a handover start parameter and transmitting it to the WCDMA system; Handover method of a multi-mode multi-band terminal in a mobile communication environment comprising a. 8. The method of claim 7, wherein in step (b2) The initialization operation is performed through a system determination substate, a pilot channel acquisition substate, and a sync channel acquisition substate. Handover Method of Mode-Multiband Terminal. delete The method of claim 1, wherein in step (e) After completing the synchronization with the CDMA-2000 system, a handover completion message (HCM) indicating that the handover has been completed is generated and transmitted to the CDMA-2000 system. Handover method of multiband terminal. The method of claim 1, wherein in step (e) The multi-mode multi-band terminal handover method of a multi-mode multi-band terminal in a mobile communication environment, characterized in that for maintaining the communication link by switching the mounted voice (Vocoder) to the CDMA-2000 modem. A multimode-multiband terminal for preventing call quality deterioration by suppressing idle handover in a mobile communication system including a CDMA-2000 system providing a CDMA-2000 service and a WCDMA system providing a WCDMA service. An antenna for transmitting and receiving an RF signal through an air interface; An RF transceiver for transmitting and receiving and demodulating the RF signal; A CDMA-2000 filter for extracting only a desired CDMA signal among RF signals of a CDMA-2000 band from the RF transceiver; A CDMA-2000 modem for call processing the CDMA signal according to a protocol defined in CDMA-2000; A WCDMA filter for extracting only a desired WCDMA signal from the RF signal of the WCDMA band from the RF transceiver; A WCDMA modem for processing the WCDMA signal according to a protocol defined in WCDMA; A control unit controlling to operate by selecting one of a WCDMA mode and a CDMA-2000 mode; And Real-time processing OS (Real Time Operating System), including a program storage unit containing an idle handover prevention program, The idle handover prevention program receives a pilot signal transmitted from the WCDMA system, checks an Ec / Io value, starts the CDMA-2000 modem based on the checked result, and requests a handover to the WCDMA system. Thereafter, before receiving the handover command, the multi-mode multi-band terminal is characterized in that the control does not occur in the idle handover occurs. 13. The method of claim 12, The control unit switches the WCDMA modem to the off state while the CDMA-2000 modem is started, and turns off the CDMA-2000 modem to the off state while the WCDMA modem is started. . delete delete 13. The method of claim 12, The CDMA-2000 modem performs an initialization operation when handing over to the CDMA-2000 system, and the initialization operation is performed through a system decision substate, a pilot channel acquisition substate, and a sink channel acquisition substate. Multimode Multiband Terminal. A mobile communication system that provides CDMA-2000 service and WCDMA service and prevents call quality from being degraded by suppressing idle handover occurrence. A wireless access network arranged in units of cells and providing the CDMA-2000 service through a traffic channel among signal channels; A RAN arranged on a cell basis and providing the WCDMA service through a traffic channel among signal channels; A mobile communication switching center performing basic and additional service processing, incoming and outgoing call processing of a subscriber, location information registration procedure and handover procedure, interworking with other networks, and interworking with the wireless access network and the RAN; And Receiving a pilot signal from the RAN, checking the Ec / Io value, starting a CDMA-2000 modem based on the checked result, and receiving a handover command in response to the request after requesting a handover to the RAN. Previously, multimode-multiband terminals with idle handover prevention programs that control idle handovers from occurring A mobile communication system comprising a. 18. The method of claim 17, wherein the multimode multiband terminal is An antenna for transmitting and receiving an RF signal through an air interface; An RF transceiver for transmitting and receiving and demodulating the RF signal; A CDMA-2000 filter for extracting only a desired CDMA signal among RF signals of a CDMA-2000 band from the RF transceiver; A CDMA-2000 modem which processes the CDMA signal according to a protocol defined in CDMA-2000; A WCDMA filter for extracting only a desired WCDMA signal from the RF signal of the WCDMA band from the RF transceiver; A WCDMA modem for processing the WCDMA signal according to a protocol defined in WCDMA; A control unit controlling to operate by selecting one of a WCDMA mode and a CDMA-2000 mode; And Program storage unit equipped with a real-time processing OS, the idle handover prevention program Mobile communication system comprising a. The method of claim 17 or 18, And the multi-mode multi-band terminal performs an initialization operation on the wireless access network when it detects that the WCDMA signal transmitted from the RAN is weakened. The method of claim 19, The initialization operation is performed through a system determination substate, a pilot channel acquisition substate, and a sink channel acquisition substate. delete delete The method of claim 17 or 18, The multi-mode multi-band terminal generates a handover end message indicating that the handover is complete after the synchronization with the wireless access network and transmits to the wireless access network. The method of claim 17, The RAN performs a radio access termination function with a terminal conforming to the 3GPP radio access standard and generates and transmits a handover command to a terminal attempting handover.

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