KR20050048194A - Hand over method from asynchronous mobile communication network to synchronous mobile communication network during origination alerting - Google Patents

Abstract

The present invention relates to a handover method from an asynchronous mobile communication network to a synchronous mobile communication network while waiting for an outgoing response. As an outgoing terminal enters the synchronous mobile communication network while waiting for outgoing response, an access network of the asynchronous mobile communication network performs a handover to the core network. Request, the core network of the asynchronous mobile communication network transmits a message requesting subscriber information in the mobile communication network of the calling terminal to perform the handover to the dual stack home location register and receives a response. A request message is generated to request a handover to the synchronous mobile communication network, the synchronous mobile communication network allocates an omnidirectional channel to the calling terminal, and the asynchronous mobile communication network is handed to the asynchronous wireless device of the calling terminal according to the response message from the synchronous mobile communication network. Send an over-request message and the calling terminal Connection is performed by synchronizing reverse channel allocation and synchronization with synchronous mobile communication network, and disconnecting the path between asynchronous mobile communication network and asynchronous wireless device of calling terminal and completing handover. The handover can be performed smoothly without any increase in call connection rate.

Description

Handover Method from Asynchronous Mobile Communication Network to Synchronous Mobile Communication Network During Origination Alerting

The present invention relates to a handover, and more particularly, to a handover method from an asynchronous mobile communication network to a synchronous mobile communication network while waiting for an outgoing response to provide a smooth handover during transmission from an asynchronous mobile communication network to a synchronous mobile communication network.

Currently, mobile communication service technology can be broadly classified into asynchronous service environment centering on Europe and synchronous service centering on North America. In addition, the IMT-2000 service is evolving around North America and Europe as a new mobile communication technology standard for delivering packets at high speed.

Synchronous IMT-2000 service (synchronous mobile communication network) is evolving into CDMA2000 1x, CDMA2000 1x EV-DO, and asynchronous IMT-2000 service (asynchronous mobile communication network) is developing into WCDMA UMTS service. Doing. In such an environment, the problem of roaming between synchronous and asynchronous is the biggest problem. Accordingly, a terminal supporting dual band / dual mode has been developed to smoothly roam a synchronous mobile network and an asynchronous mobile communication network.

The asynchronous mobile communication network is being built around an area with high service demands. Accordingly, the synchronous mobile communication network has evolved into a form in which the service area includes a service area of an asynchronous system. In the case of mutual movement between the system and the synchronous mobile communication system, handover between systems is required for continuous service provision.

Accordingly, there is a demand for a handover method for a case where a calling terminal moves from an area of an asynchronous mobile communication network to an area of a synchronous mobile communication network during transmission.

Accordingly, the present invention to solve the problems described above is an asynchronous mobile communication network waiting for an outgoing response to provide a smooth call origination when the mobile communication terminal supporting the dual band / dual mode is moved from the asynchronous mobile communication network to the synchronous mobile communication network during the call origination. It is an object of the present invention to provide a handover method from a network to a synchronous mobile communication network.

In order to achieve the above object, a handover method from an asynchronous mobile communication network to a synchronous mobile communication network during a call response wait according to the present invention includes an asynchronous wireless device for performing asynchronous communication with an asynchronous mobile communication network, and a synchronous communication with a synchronous mobile communication network. An asynchronous mobile communication network for a dual-band dual mode mobile communication terminal having a synchronous radio device for performing the communication, and a common module for performing control during wireless communication with the synchronous / asynchronous mobile communication network through the synchronous and asynchronous radio devices; A mobile communication network handover method comprising a synchronous mobile communication network and a dual stack home location register for managing subscriber information of the asynchronous mobile communication network and the synchronous mobile communication network, wherein the mobile terminal is a calling terminal located in an area of the asynchronous mobile communication network. While the communication terminal is waiting for an outgoing response, Step 1, the access network of the asynchronous mobile communication network requests a handover to a core network as it enters, and the subscriber in the synchronous mobile communication network of the calling terminal to which the core network of the asynchronous mobile communication network performs handover according to the handover request. In step 2 of transmitting a message requesting information to the dual stack home location register and receiving a response, an exchange of the asynchronous mobile communication network generates a handover request message according to the information of the calling terminal received in step 2 to synchronize. Step 3 of requesting handover to the mobile communication network; step 4 of the synchronous mobile communication network assigning an omnidirectional channel to the calling terminal according to the information in step 3; and in step 4, the synchronous mobile communication network is an asynchronous mobile communication network. When the response message is sent, the asynchronous mobile communication network handles the asynchronous wireless device of the calling terminal. In step 5 of transmitting an over request message, the calling terminal waiting for an originating response according to the handover request message performs setup of a synchronous wireless device and performs connection by synchronizing a reverse channel assignment and synchronization with a synchronous mobile communication network; A sixth step of continuing to wait for a response, and handover of the calling terminal by releasing a path between the asynchronous mobile communication network and an asynchronous radio device of the calling terminal waiting for an outgoing response according to a handover completion message from the synchronous mobile communication network after the connection; Characterized in that it comprises a seven steps to complete.

Hereinafter, with reference to the accompanying drawings to describe the present invention in detail.

1 is a block diagram illustrating the configuration of a synchronous and asynchronous mobile communication network according to the present invention.

Referring to FIG. 1, an asynchronous mobile communication network (WCDMA network) 100 includes a radio station 101 performing wireless communication with a mobile communication terminal 400 and a radio station controller (hereinafter, referred to as 'RNC') for controlling the radio station 101. 102, and a Serving GPRS Support Node (hereinafter referred to as 'SGSN') 103 connected to the RNC 102 to manage mobility of the mobile communication terminal 400; (Gateway GPRS Support Node, hereinafter referred to as 'GGSN'), which is a relay device that performs the packet service control and packet data transmission through the General Packet Radio Service (GPRS) network 105. It includes.

In addition, an exchanger (hereinafter referred to as 'MSC') 104 is connected to the RNC 102 to perform a call exchange, and the MSC 104 is a number seven signal network (No. 7 signal network) for signal exchange ( 107). The number seven signal network 107 has a short message service center (hereinafter referred to as 'SMSC') 108 for providing a short message, and a dual stack home location register (hereinafter referred to as 'dual stack HLR') for managing subscriber location information. 300 is connected. At this time, the dual stack HLR 300 is shared with the synchronous mobile communication network 200 to be described later.

On the other hand, the synchronous mobile communication network (CDMA2000 network) 200, the base station (hereinafter referred to as 'BTS') for performing wireless communication with the mobile communication terminal 400 and the base station controller for controlling the BTS 201 (Hereinafter referred to as 'BSC') 202, a Packet Data Service Node (hereinafter referred to as 'PDSN') 204 connected to the BSC 202 and serving packet data and the PDSN ( A data core network (hereinafter referred to as "DCN") 209 connected to 204 and performing an Internet access service, and an exchanger connected to the BSC 202 to perform an exchange (hereinafter referred to as "MSC"). 203).

The MSC 203 is connected with a number seven signal network (No. 7 signal network) 205 for signal exchange. The number seven signal network 205 is connected to a short message service center (hereinafter referred to as 'SMSC') 206 that services a short message, and the dual stack HLR 300 for managing location information of a subscriber.

The MSCs 104 and 203 of the asynchronous mobile communication network 100 and the synchronous mobile communication network 20 are interconnected, and the number seven signal networks 107 and 205 are also interconnected to handover the mobile communication terminal 400. Information necessary for transmitting and receiving is transmitted.

In addition, in the present embodiment, the dual stack HLR 300 connected to the synchronous mobile communication network 200 and the asynchronous mobile communication network 100 respectively provides information and location information of subscribers of the asynchronous mobile communication network 100 and the synchronous mobile communication network 200. Manage and share the asynchronous mobile communication network 100 and the synchronous mobile communication network 200.

2 is a block diagram illustrating a configuration of a dual band mobile communication terminal according to the present invention.

Referring to FIG. 2, the dual band mobile communication terminal 400 according to the present invention supports both synchronous mobile communication and asynchronous mobile communication and has a stack of respective protocols.

The mobile communication terminal 400 according to the present invention is broadly divided into an antenna 410 for transmitting and receiving radio waves with the synchronous mobile communication network 200 and the asynchronous mobile communication network 100, and a synchronous radio device 430 for synchronous communication. , Asynchronous radio 420 for asynchronous communication, and a common module 440 for providing common resources in synchronous and asynchronous communication.

The synchronous radio device 430 includes a synchronous radio transmitter 432 for radio transmission, a synchronous radio receiver 433 for radio reception, and a synchronous modem unit 434. The synchronous radio transmitter 432 and One side of the synchronous radio receiver 433 is connected to the antenna 410 through a duplexer 431, and the other side is connected to the synchronous modem unit 434.

In addition, the asynchronous radio device 420 also includes an asynchronous radio transmitter 422 for radio transmission, an asynchronous radio receiver 423 for radio reception, and an asynchronous modem unit 424. The asynchronous radio transmitter 422 and One side of the asynchronous radio receiver 423 is connected to the antenna 410 through the duplexer 421 and the other side is connected to the asynchronous modem unit 424.

The common module 440 may include an application processor, a memory, an input / output unit, other application processing units, etc. that operate as a central processing unit for controlling the synchronous modem unit 434 and the asynchronous modem unit 424 and perform multimedia functions. Detailed configuration is as follows.

3 is a block diagram illustrating a configuration of a common module of a mobile communication terminal according to the present invention.

Referring to FIG. 3, the common module 440 of the mobile communication terminal according to the present invention includes a plurality of dual devices connected to the modem units 424 and 434 of the synchronous radio device 430 and the asynchronous radio device 420. Dual Port RAM (hereinafter referred to as DPRAM) 441 and 442 and the DPRAM 441 and 442 are connected to perform overall control and application execution of synchronous and asynchronous communication of the mobile communication terminal 400. A main processor 443. The main processor 443 includes a memory 444 for storing data, an I / O device 445 for connecting a peripheral device, and a power control module (hereinafter referred to as 'PWM') 446 for power control. Connected.

The common module 440 having the above-described configuration is equipped with software for user interface, additional service, mobility management, access / session control, resource control, and protocol processing, so that users can use various application services and handover. Performs protocol conversion according to the mobile communication system.

4 is a conceptual diagram of a handover waiting for an originating response in a mobile communication network in which an asynchronous network and a synchronous network are mixed according to an embodiment of the present invention.

Referring to FIG. 4, the mobile communication terminal 400a, which is the calling terminal, moves from the area A of the asynchronous mobile communication network 100 to the boundary area C with the synchronous mobile communication network 200 waiting for an outgoing response through the wireless station. If so, the calling terminal 400a requests a handover to the radio station of the asynchronous mobile communication network 100. Accordingly, a handover is performed between the asynchronous mobile communication network 100 and the synchronous mobile communication network 100 for the calling terminal 400a. In addition, the origination response wait of the originating terminal 400a is continuously performed through a base station (BTS) of a synchronous mobile communication network.

That is, the calling terminal 400a, which is located in the area of the asynchronous mobile communication network 100, waits for a call response, periodically measures the signal strength with the radio station 101, reports it to the radio station 101, and reports the signal strength of the radio station 101. If is lowered below the specified threshold, the radio station 101 reports that a handover event has occurred through the RNC 102 to the MSC 110 of the asynchronous mobile communication network 100. At this time, the access network (radio station / RNC) transmits the neighbor cell information, the base station ID, and the like detected by the calling terminal 400a to the MSC 110 of the asynchronous mobile communication network 100.

When the MSC 110 of the asynchronous mobile communication network 100 receives the handover request message from the access network, the neighbor cells in the asynchronous mobile communication network 100 are referred to with reference to neighbor cell information, base station ID, etc. received from the RNC 102. It is determined whether it is handover or handover to the synchronous mobile communication network 200. In the case of handover between adjacent cells in the asynchronous mobile communication network 100, the MSC 110 of the asynchronous mobile communication network 100 performs handover to the adjacent cell.

However, in the case of a handover to the synchronous mobile communication network 200, in order to obtain subscriber information, an asynchronous message (MAP SEND IMSI) having a parameter as shown in FIG. 5A or a synchronization having a parameter as shown in FIG. 5B is obtained. A message (Call Data Request) is generated and transmitted to the dual stack HLR 300.

Then, a response message from the dual stack HLR 300 is received, the handover target MSC is selected according to the information of the synchronous mobile communication network 200 prepared in advance, and a billing ID including a handover target exchange ID is generated. do. In addition, the MSC 104 of the asynchronous mobile communication network includes a billing ID including the ESN and MIN information included in the response message from the dual stack HLR 300 and the handover target exchange ID as shown in FIG. 5C. Generates a handover request message (FacilitiesDrictive2) including and transmits to the synchronous mobile communication network (200).

At this time, the MSC 104 of the asynchronous mobile communication network sets a parameter (HandoffState) indicating a handover state in the handover request message as a caller handover.

The handover method of the call response waiting according to the above process will be described in detail below.

6A and 6B are flowcharts illustrating a handover method during a call response waiting according to an embodiment of the present invention.

6A and 6B, the mobile communication terminal 400 is waiting for an originating response in the asynchronous mobile communication network 100 using the asynchronous wireless device 420 (S10), and an access network (radio station and RNC) of the asynchronous mobile communication network. Determining whether or not the mobile communication terminal is handed over (S21). If it is determined in step S21 that the handover is performed according to a preset handover condition, the access network transmits a handover request message (IU Reloc Required) to the core network (S22). In this case, the handover request message may include a message type, a handover type, a cause of the handover, a source base station ID, a target base station ID, radio access bearer (RAB) information, and radio section related information, and a cell used in the synchronous mobile communication network 200. It includes information (Cell Identifier List).

Accordingly, the MSC 104, which is a core network of the asynchronous mobile communication network 100, transmits a message requesting subscriber information in the synchronous mobile communication network of the mobile communication terminal to perform handover to the dual stack HLR 300 (S31). Requests identifier information from the synchronous mobile communication network 200.

At this time, the subscriber information request message is an asynchronous message (MAP SEND IMSI Req) using a MAP (Mobile Application Part) message as shown in FIG. 5A and including parameters such as an Invoke ID, MSISDN, IMSI, MIN, ESN, and the like. Alternatively, as shown in FIG. 5B, it may be a call data request including parameters such as a billing ID, a digit (ie, MSISDN), and the like.

In response to the subscriber information request, the dual stack HLR 300 sends a response message including ESN and MIN information, which is identifier information in the synchronous mobile communication network 200 of the subscriber, to the MSC 104 of the asynchronous mobile communication network 100. It transmits (S32).

The MSC 104 of the asynchronous mobile communication network 100 transmits the handover request message FacilitiesDirective2 of the mobile communication terminal 400 corresponding to the ESN and MIN information included in the response message to the MSC which is the core network of the synchronous mobile communication network. (S41). At this time, the handover request message includes cell information which is base station information of the aforementioned synchronous mobile communication network to perform handover as shown in FIG. 5C, billing ID, ESN, MIN information, and performs handover. Set HandoffState, a parameter that represents a mobile communication terminal, as a calling terminal.

The MSC 203 of the synchronous mobile communication network 200 transmits a handover request message to the access networks BTS and BSC of the synchronous mobile communication network 200 according to the handover request message (S42).

The access network of the synchronous mobile communication network transmits a null traffic channel frame to a synchronous radio of a mobile communication terminal corresponding to the MIN through a forward fundamental channel (F-FCH) for forward traffic transmission (F-FCH). S50). The access network then transmits a handover request response message to the MSC (S61). Accordingly, the omnidirectional channel is allocated to the synchronous radio device 430 of the mobile communication terminal 400.

As such, when the handover preparation is completed in the synchronous mobile communication network 200, the MSC 203 of the synchronous mobile communication network 200 transmits a response signal to the asynchronous mobile communication network 100, that is, a handover request message response ( FacilitiesDirective2 Ack) is transmitted (S62). Thereafter, the MSC of the asynchronous mobile communication network 100 transmits an IU Relocation Command to the access network (radio station / RNC) (S71).

According to the rerouting command in step S71, the access network (radio station / RNC) transmits a handover request message to the asynchronous radio device 420 of the mobile communication terminal 400 (S72). In this case, the handover message includes a message related to a synchronous mobile communication network, in particular a handoff direction message (HDM) having information for channel allocation.

According to the handover request message in step S72, the asynchronous wireless device 420 requests channel allocation through the main processor 443, and the main processor 443 performs channel allocation to the synchronous wireless device 430 (channel). assignment) (S81).

Accordingly, the synchronous modem unit 434 of the synchronous wireless device 430 performs a setup process (S82). In the setup process, the synchronous modem unit 434 is activated through a switch-on and warm-up process, and performs synchronization with the BTS / BSC of the synchronous mobile communication network 200 by acquiring a pilot channel and acquiring a synchronization channel. By acquiring the synchronization channel, timing information, other system information, and the like are received from the BTS / BSC.

The synchronous radio 430 transmits a call connection signal to the asynchronous radio 420 through the main processor 443 (S83). Accordingly, mode switching between the asynchronous wireless device 420 and the synchronous wireless device 430 of the mobile communication terminal 400 is completed.

In addition, the synchronous radio apparatus 430 transmits a traffic channel frame through a reverse fundamental channel (R-FCH) to an access network (BTS / BSC) of the synchronous mobile communication network 200 (R-FCH frames) (S91). By doing so, the mobile communication terminal 400 obtains backward synchronization with the synchronous mobile communication network. Accordingly, a connection is established between the mobile communication terminal 400 and the synchronous mobile communication network 200, and the synchronous wireless device 430 of the mobile communication terminal 400 transmits a handover completion message to the access network of the synchronous mobile communication network 200. (S92).

Thereafter, the access network (BTS / BSC) of the synchronous mobile communication network 200 notifies the MSC 203 of the handover completion (Handoff Complete) (S94), and the MSC 203 of the synchronous mobile communication network 200 moves asynchronously. The handover completion is notified to the core network of the communication network 100 (S95). The asynchronous mobile communication network 100 changes the radio station bearer termination and the synchronous mobile communication network bearer termination in one way according to the handover completion notification.

The MSC 104 of the asynchronous mobile communication network 100 requests the radio station / RNC to release the call with the asynchronous wireless device 420 of the mobile communication terminal 400 (Iu Release Command, S101). The communication network 100 releases the call with the asynchronous radio device 420 and reports to the core network that the call release is completed (IU Release Complete) (S102). The asynchronous mobile communication network 100 removes the radio station bearer termination of the access network (S103).

Accordingly, the handover from the asynchronous mobile communication network 100 of the mobile communication terminal 400 waiting for an outgoing response to the synchronous mobile communication network 200 is completed.

After the completion of the handover, when the called terminal located in the area of the asynchronous mobile communication network 100 responds (S110), the asynchronous mobile communication network according to the message (BICC, which is asynchronous message, or ISUP Answer, which is a synchronous message) transmitted from the receiving system. The MSC 104 of 100 transmits an intersystem response message (InterSystemAnswer) to the synchronous mobile communication network 200 where the calling terminal has handed over (S121).

Accordingly, the MSC 203 of the synchronous mobile communication network 200 transmits a message (Progress) informing the progress of the call to the access network (S122), and transmits the response (InterSystemAnswer Ack) according to the message in step S121 (asynchronous mobile communication network). 100) (S123). Therefore, a call between the mobile communication terminal and the called party which has handed over to the area of the synchronous mobile communication network 200 is connected (S123).

If a call is made after the call is connected and one of the called terminal and the calling terminal releases the call (S130), the following procedure is followed.

When the mobile communication terminal located in the area of the asynchronous mobile communication network 100 releases the call, the asynchronous mobile communication network 100 transmits a call release request message to the synchronous mobile communication network 200 (S141). The mobile communication network 200 transmits the corresponding response message (Facilities Ack) to the asynchronous mobile communication network 100 (S142), and then completely calls a call with the mobile communication terminal 400 located in the area of the synchronous mobile communication network 200. Release it.

However, when the mobile communication terminal located in the area of the synchronous mobile communication network 200 releases the call, the synchronous mobile communication network 200 transmits a call release request message to the asynchronous mobile communication network 100 (S151). The asynchronous mobile communication network 100 transmits the response message (Facilities Ack) to the synchronous mobile communication network 200 (S152), and then completely releases the call with the mobile communication terminal located in the area of the asynchronous mobile communication network 100. do.

The present invention described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

As described in detail above, according to the handover method from the asynchronous mobile communication network to the synchronous mobile communication network while waiting for an outgoing response according to the present invention, a calling terminal waits for a call response in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed. When moving from the area of the asynchronous mobile communication network to the area of the synchronous mobile communication network, the call connection rate can be improved by smoothly performing the handover without disconnection.

1 is a block diagram illustrating a connection between a mobile communication terminal and a mobile communication network according to the present invention;

2 is a block diagram for explaining the configuration of a mobile communication terminal according to the present invention;

3 is a block diagram for explaining the configuration of a mobile communication terminal according to the present invention;

4 is an explanatory diagram for explaining a handover of a mobile communication terminal while waiting for an outgoing response according to the present invention;

5A to 5C are explanatory diagrams for explaining parameters of a message used in a handover process according to the present invention.

6A and 6B are flowcharts illustrating a handover process of waiting for a call response according to the present invention.

<Brief description of the main parts of the drawings>

100: asynchronous mobile communication network 200: synchronous mobile communication network

400: mobile communication terminal 410: antenna

420: asynchronous wireless device 430: synchronous wireless device

440: common module 443: main processor

Claims (11)

An asynchronous wireless device for performing asynchronous communication with an asynchronous mobile communication network, a synchronous wireless device for performing synchronous communication with a synchronous mobile communication network, and control during wireless communication with the synchronous / asynchronous mobile communication network through the synchronous and asynchronous wireless device. An asynchronous mobile communication network and a synchronous mobile communication network for a dual-band dual mode mobile communication terminal having a common module for performing a mixture are mixed, and includes a dual stack home location register for managing subscriber information of the asynchronous mobile communication network and the synchronous mobile communication network. As a handover method of a mobile communication network, A first step in which an access network of the asynchronous mobile communication network requests a handover to a core network as the mobile communication terminal, which is a calling terminal located in an area of an asynchronous mobile communication network, enters a synchronous mobile communication network while waiting for an outgoing response; In response to the handover request, the core network of the asynchronous mobile communication network sends a message requesting subscriber information in the synchronous mobile communication network of the calling terminal to perform handover to the dual stack home location register and receives a response; A third step in which the exchange of the asynchronous mobile communication network generates a handover request message and requests a handover to the synchronous mobile communication network according to the information of the calling terminal received in step 2; A fourth step of allocating an omnidirectional channel to the calling terminal by the synchronous mobile communication network according to the information in step 3, Step 5 in which the synchronous mobile communication network transmits a response message to the asynchronous mobile communication network after the channel assignment in step 4, the asynchronous mobile communication network transmits a handover request message to the asynchronous wireless device of the calling terminal; A sixth step in which the calling terminal waiting for an originating response according to the handover request message performs setup of a synchronous radio, performs connection by synchronizing a reverse channel assignment and synchronization with a synchronous mobile communication network, and continues waiting for the originating response; and And the step 7 of completing the handover of the calling terminal by releasing the path between the asynchronous mobile communication network and the asynchronous radio device of the calling terminal waiting for an outgoing response according to the handover completion message from the synchronous mobile communication network after the connection. A handover method from an asynchronous mobile communication network to a synchronous mobile communication network while waiting for an outgoing response. According to claim 1, The handover request from the asynchronous mobile communication network from the asynchronous mobile communication network to the synchronous mobile communication network, characterized in that the handover request in the step 1 comprises cell information which is the base station information of the synchronous mobile communication network to perform the handover. According to claim 1, In step 2, the message requesting the subscriber information of the mobile communication terminal to the dual stack home location register is a synchronous MAP message and includes a parameter such as billing ID and MSISDN. Handover method to mobile communication network. According to claim 1, In step 2, the message requesting subscriber information of the mobile communication terminal to the dual stack home location register is an asynchronous message using a MAP message, and includes parameters such as an invoke ID, MSISDN, IMSI, MIN, and ESN. A handover method from an asynchronous mobile communication network to a synchronous mobile communication network while waiting for an outgoing response. According to claim 1, In step 2, the dual stack home location register, characterized in that for transmitting the response message including the ESN and MIN information for the synchronous mobile communication network of the mobile communication terminal according to the message requesting the subscriber information, characterized in that the asynchronous mobile communication network A handover method from an asynchronous mobile communication network to a synchronous mobile communication network while waiting for an outgoing response. According to claim 1, In step 4, the base station of the synchronous mobile communication network performs omni-directional channel allocation by transmitting a null traffic channel frame to the synchronous radio of the mobile communication terminal which is the originating terminal. Handover method to synchronous mobile communication network. According to claim 1, The setup of step 6 may include transmitting a handover request message including channel allocation information to an asynchronous wireless device of a mobile communication terminal of the calling terminal by the asynchronous mobile communication network according to the handover request message; Transmitting, by the asynchronous radio device of the mobile communication terminal which is the calling terminal, the channel assignment information to the synchronous radio device; and And performing a mode switch between the asynchronous wireless device and the synchronous wireless device. The method of claim 7, wherein The sixth step includes a step of acquiring a reverse channel assignment and synchronization between the synchronous radio and the synchronous mobile communication network after the setup, and performing a connection. And the synchronous radio device of the calling terminal continues the call response response through the synchronous mobile communication network. According to claim 1, In step 7, the asynchronous mobile communication network removes the radio station bearer termination of the access network for the asynchronous wireless device of the called terminal from the outgoing response standby asynchronous mobile communication network according to the path release. Handover method. According to claim 1, In step 7, the asynchronous mobile communication network changes the radio station bearer termination and the synchronous mobile communication network bearer unidirectionally according to the handover completion message from the synchronous mobile communication network. Handover method to mobile communication network. According to claim 1, The handover method may further include: transmitting an intersystem response message to an synchronous mobile communication network by an asynchronous mobile communication network as the called terminal responds to the origination of the calling terminal; An originating terminal positioned in the area of the synchronous mobile communication network by instructing the call forwarding of the calling terminal to an access network according to the intersystem response message and transmitting a response of the intersystem response message to an asynchronous mobile communication network; A method for handover from an asynchronous mobile communication network to a synchronous mobile communication network during call waiting response comprising the step of connecting a call of the called terminal.