KR100589959B1 - Hand Over Method from Asynchronous Mobile Communication Network to Synchronous Mobile Communication Network During Termination Alerting - Google Patents

Abstract

The present invention relates to a handover method during incoming alerting. When the incoming terminal enters the synchronous mobile communication network during incoming alerting, the asynchronous mobile communication network requests and receives information of the called terminal with the dual stack home location register. When a handover is requested to the synchronous mobile communication network according to the information of the called terminal, and the synchronous mobile communication network allocates an omnidirectional channel to the called terminal and then the synchronous mobile communication network transmits a response message to the asynchronous mobile communication network, the asynchronous mobile communication network is connected to the receiving terminal. A handover request message is transmitted to the asynchronous wireless device, and according to the handover request message, the called terminal performs connection by synchronizing the reverse channel assignment and synchronization with the synchronous mobile communication network after the setup of the synchronous wireless device, and the hand from the synchronous mobile communication network. Asynchronous wireless field of asynchronous mobile communication network and called terminal according to over complete message When the receiving terminal responds to the incoming alert, the synchronous mobile communication network connects the call, and handovers without disconnection even when the receiving terminal moves from the asynchronous mobile communication area to the synchronous mobile communication area during alerting. There is an effect that can be performed smoothly.

Description

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

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 during incoming alerting according to the present invention;

5A and 5B are flowcharts illustrating a handover process 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

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 during incoming alerting to provide smooth incoming alerting from the asynchronous mobile communication network to the 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 developed as CDMA2000 1x, CDMA2000 1x EV-DO, and asynchronous IMT-2000 service (asynchronous mobile communication network) is developed as 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 called terminal moves from an area of an asynchronous mobile communication network to an area of a synchronous mobile communication network during alerting.

Accordingly, in order to solve the above problems, the present invention provides an incoming alert for smooth incoming alerting when a mobile communication terminal supporting dual band / dual mode moves from an asynchronous mobile communication network to a synchronous mobile communication network during incoming alerting. It is an object of the present invention to provide a handover method from an asynchronous mobile communication network to a synchronous mobile communication network.

A method for handover from an asynchronous mobile communication network to a synchronous mobile communication network during incoming alerting according to the present invention for achieving the above object is that the mobile communication terminal receiving incoming alert located in an area of the asynchronous mobile communication network is a synchronous mobile communication network. In step 1, the asynchronous mobile communication network requests and receives information from the synchronous mobile communication network of the called terminal using the dual stack home location register, and the information on the received synchronous mobile communication network of the called terminal is received. Accordingly, step 2, wherein the asynchronous mobile communication network transmits a handover request message including base station information, billing ID, and parameter indicating that the mobile communication terminal to be handed over is receiving a call to the synchronous mobile communication network; Step 3, asynchronous mobile communication network to change the voice channel to the call state, the second stage In step 4, the synchronous mobile communication network allocates an omnidirectional channel to the called terminal according to the information, and if the synchronous mobile communication network sends a response message to the asynchronous mobile communication network after assigning the channel in step 4, the asynchronous mobile communication network is connected to the called terminal. In step 5, transmitting a handover request message to an asynchronous wireless device, according to the handover request message, the called terminal performs setup of a synchronous wireless device and performs connection by synchronizing a reverse channel assignment and synchronization with a synchronous mobile communication network; Step 6 of continuing incoming alerting; step 7 of releasing a path between the asynchronous mobile communication network and an asynchronous radio device of the called terminal according to a handover completion message from the synchronous mobile communication network after the connection; and the called terminal receives the incoming call. In response to alerting, the synchronous mobile network interworks with the asynchronous mobile network. By sending a response message, and receiving a response comprises the step 8 for connecting a call of the called terminal and calling terminal.

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 that provides a short message service, and a dual stack home location register (hereinafter referred to as 'dual stack') for managing subscriber location information. HLR ') 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, includes 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 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 handover during incoming alerting 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 400b, which is the called 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 during incoming alerting through the wireless station. If so, the called terminal 400b 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 called terminal 400b.

In addition, outgoing calls from the calling terminal 400a are received by the called terminal 400b through the base station (BTS) of the synchronous mobile communication network.

The handover method during incoming alerting according to the above process will be described in detail below.

5A and 5B are flowcharts illustrating a handover method during incoming alerting according to an embodiment of the present invention.

Referring to FIGS. 5A and 5B, an alerting operation is performed from the asynchronous mobile communication network to the asynchronous wireless device 420 of the mobile communication terminal 400 (S10), and the access network (radio station and RNC) of the asynchronous mobile communication network is connected to the mobile communication terminal. It is determined whether the handover (S21). If it is determined in step S21 that the handover is performed according to a preset handover condition, the access network transmits a redirection request message (IU Reloc Required) to the core network (S22). At this time, the re-routing request message includes cell information (Cell Identifier List) which is base station information of the synchronous mobile communication network to perform handover.

Accordingly, the MSC of the asynchronous mobile network core network uses a MAP (Mobile Application Part) message to send a dual stack HLR message (MAP SEND IMSI Req) requesting information from the synchronous mobile communication network of the mobile terminal to perform handover. It transmits (S31). The dual stack HLR transmits a response message including the ESN and MIN information to the MSC of the asynchronous mobile communication network (S32).

The MSC of the asynchronous mobile communication network transmits a handover request message (FacilitiesDirective2) of the mobile communication terminal corresponding to the 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 the base station information of the above-described synchronous mobile communication network to perform the handover, billing ID, and parameters indicating that the mobile communication terminal to perform the handover is the called terminal and calls the voice channel. It is in a state.

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

The access network of the synchronous mobile communication network transmits a null traffic channel frame to the synchronous radio of the 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 a call with the asynchronous wireless device 420 of the mobile communication terminal 400 (Iu Release Command, S101). The mobile communication network 100 releases the call with the asynchronous radio apparatus 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 incoming mobile communication terminal 400 to the synchronous mobile communication network 200 is completed.

After the handover is completed, if the mobile communication terminal 400 located in the area of the synchronous mobile communication network 200 responds (S110), the MSC of the synchronous mobile communication network sends an intersystem response message (InterSystemAnswer) to the asynchronous mobile communication network 100. Transfer to (S121). At this time, the asynchronous mobile communication network 100 receiving the intersystem response message transmits a predetermined ISUP ANSWER message to the system that originated the first call. The asynchronous mobile communication network 100 transmits the response according to the message in step S121 to the synchronous mobile communication network 200 (S122). Therefore, a call is connected between the mobile communication terminal 400 which is the called terminal located in the synchronous mobile communication network 200 and the asynchronous mobile communication network 100 where the calling terminal is located (S123).

If a call is made after the call is connected and either the called terminal or the calling terminal releases the call, the following procedure is followed.

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

However, when the called terminal 400 located in the synchronous mobile communication network 200 releases the call, the synchronous mobile communication network 200 transmits a call release request message (Facilities Release) 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 calling terminal.

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 during incoming alerting, the receiving terminal is alerting in the mobile communication network in which the asynchronous mobile communication system and the 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 disconnecting the call.

Claims (12)

In a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network are mixed and including a dual stack home location register for managing subscriber information of the asynchronous mobile communication network and the synchronous mobile communication network, an asynchronous radio for performing asynchronous communication with the asynchronous mobile communication network. Dual band dual having a device, a synchronous wireless device for performing synchronous communication with the synchronous mobile communication network, and a common module for performing control during wireless communication with the synchronous and asynchronous mobile communication network through the synchronous and asynchronous wireless devices. A handover method during incoming alerting of a mode mobile communication terminal, When the mobile communication terminal that is located in the area of the asynchronous mobile communication network enters the synchronous mobile communication network, the asynchronous mobile communication network requests and receives information from the synchronous mobile communication network of the called terminal using the dual stack home location register. Stage 1, According to the information on the synchronous mobile communication network of the called terminal received in step 1, the asynchronous mobile communication network is receiving a mobile communication terminal to perform base station information, billing ID, and handover of the synchronous mobile communication network. In step 2 of transmitting a request message for handover including a parameter indicating a value, 3, the asynchronous mobile communication network changes the voice channel to a call state; A fourth step of allocating an omnidirectional channel to the called terminal by the synchronous mobile communication network according to the information in the second step; Step 5 in which the synchronous mobile communication network transmits a response message to the asynchronous mobile communication network after channel assignment in step 4, the asynchronous mobile communication network transmitting a handover request message to the asynchronous wireless device of the called terminal; A sixth step in which the called terminal performs setup of a synchronous radio according to the handover request message, performs connection by performing reverse channel assignment and synchronization with a synchronous mobile communication network, and continues the incoming alert; A step 7 of releasing a path between the asynchronous mobile communication network and the asynchronous radio device of the called terminal according to the handover completion message from the synchronous mobile communication network after the connection; and And a step 8 of connecting the call between the called terminal and the calling terminal by transmitting an intersystem response message to the asynchronous mobile communication network and receiving a response as the called terminal responds to the incoming alert. A handover method from an asynchronous mobile communication network to a synchronous mobile communication network during incoming alerting. According to claim 1, In step 1, an access network of the asynchronous mobile communication network transmits a redirection request message to the core network as the mobile communication terminal enters the synchronous mobile communication network during incoming alerting. Steps, In response to the redirection request message, a core network of an asynchronous mobile communication network sends a message requesting information from a synchronous mobile communication network of a mobile communication terminal to perform a handover using a MAP message to the dual stack home location register. And receiving a response to the handover method from the asynchronous mobile communication network to the synchronous mobile communication network during incoming alerting. The method of claim 2, The rerouting request message includes the cell information which is the base station information of the synchronous mobile communication network to perform the handover from the asynchronous mobile communication network to the synchronous mobile communication network during incoming alerting. The method of claim 2, The dual stack home location register includes the ESN and MIN information for the synchronous mobile communication network of the called terminal in the response message and transmits the information to the asynchronous mobile communication network according to the map message. To handover to a synchronous mobile network. The method of 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. How to handover to According to claim 1, In the setting of step 6, the asynchronous mobile communication network transmits a handover request message including channel allocation information to an asynchronous wireless device of the mobile communication terminal according to the handover request message. Transmitting, by the asynchronous wireless device of the mobile communication terminal, the channel assignment information to the synchronous wireless device; and And performing a mode changeover between the asynchronous radio device and the synchronous radio device. The handover method from the asynchronous mobile communication network to the synchronous mobile communication network during incoming alerting. The method of claim 6, In step 6, after the set-up, a step of acquiring reverse channel allocation and synchronization between the synchronous radio and the synchronous mobile communication network to perform a connection, and And the synchronous mobile communication network continues the incoming alert to the synchronous wireless device of the called terminal. The method of 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 asynchronous mobile communication network to the synchronous mobile communication network according to the release of the path. Handover method. The method of 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. delete According to claim 1, The exchange of the asynchronous mobile communication network receives the intersystem response message and transmits the response message of the called terminal to the mobile communication network to which the calling terminal belongs. Handover method to synchronous mobile communication network. According to claim 1, And the switch of the asynchronous mobile communication network continuously transmits a ringback tone to the calling terminal even during the handover of the called terminal.

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