KR100718008B1 - Method for controlling Multi-mode Multi-band Mobile Communication Terminal for Hand-over Between Asynchronous Communication Network and Synchronous Communication Network - Google Patents

Abstract

A method of controlling a mobile communication terminal for modem driving and searching for a handover target cell in a handover between an asynchronous network and a synchronous network is provided.

In the method of controlling a mobile terminal for handover between an asynchronous network and a synchronous network, as the mobile terminal using the service of the asynchronous mobile communication system moves to the synchronous area, the asynchronous modem part of the mobile terminal is dummy from the synchronous mobile communication system. Receives a pilot signal, causes the synchronous modem unit of the mobile communication terminal to be driven and searches for the handover target cell, reports the handover target cell search result to the asynchronous mobile communication system, and receives a handover command from the asynchronous mobile communication system. The first process includes transmitting a channel assignment message to the synchronous modem unit, a second process of switching a vocoder and turning off the asynchronous modem unit, and a third process of acquiring synchronization with the synchronous mobile communication system.

According to the present invention, it is possible to provide a continuous service by preventing call disconnection during handover.

Asynchronous mobile communication system, synchronous mobile communication system, handover

Description

Method for controlling Multi-mode Multi-band Mobile Communication Terminal for Hand-over Between Asynchronous Communication Network and Synchronous Communication Network}

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

2 is a structural diagram of a mobile communication terminal applied to the present invention;

3 is a conceptual diagram of handover in a mobile communication network in which an asynchronous network and a synchronous network are mixed;

4 is a graph illustrating a change in strength of a dummy pilot signal according to movement of a mobile communication terminal;

5 is a flowchart illustrating a mobile communication terminal control method according to an embodiment of the present invention;

6 is a flowchart illustrating a mobile communication terminal control method according to another embodiment of the present invention.

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

10: multi-mode multi-band mobile communication terminal 20: asynchronous mobile communication system

30: synchronous mobile communication system 40: Internet

100: antenna 110: synchronization module                 

111, 121: duplexer 112: synchronous radio transceiver

113: synchronous modem unit 122: asynchronous wireless transceiver

123: asynchronous modem unit 130: common module

210: Node B / wireless network controller 220: asynchronous switch

230, 330: No.7 common signal network 240, 340: Short service center

250, 350: intelligent network controller 260, 360: home location register

270: SGSN 280: GPRS network

290: GGSN 310: base station / base station controller

320: switch 370: packet data service node

380 data core network

The present invention relates to a handover method in a mobile communication network, and more particularly, to a method for controlling a mobile communication terminal for driving a modem and searching for a handover target cell of a multi-mode multiband mobile communication terminal during a handover between an asynchronous network and a synchronous network. It is about.

With the development of mobile communication technology and the evolution of communication networks, various types of mobile communication systems are being developed. Accordingly, the IMT-2000 system has been developed to solve the global roaming problem between mobile communication systems. IMT-2000 system is divided into CDMA2000 based synchronous system and WCDMA based asynchronous system.                         

In addition, in order to support global roaming between mobile communication systems, a mobile communication terminal (Multi Mode Multi Band Mobile Communication Terminal) capable of being used in both a synchronous system and an asynchronous system has been developed. This allows different types of services to be used in each of the asynchronous system domain and the synchronous system domain.

Currently, asynchronous mobile communication systems are being built around regions with high service demands, and accordingly, synchronous mobile communication systems have evolved to include service areas of asynchronous system. When a user moves between an asynchronous mobile communication system and a synchronous mobile communication system, handover between systems is required for continuous service provision.

For handover from an asynchronous mobile communication system to a synchronous mobile communication system, it is important to effectively retrieve a signal of the synchronous mobile communication system during service use from the asynchronous mobile communication system. To this end, a multi-mode multiband mobile communication terminal must drive a modem to access a synchronous mobile communication system while searching for a cell to be handed over while using a service from an asynchronous mobile communication system to perform a handover.

However, at present, research on the control method of a multi-mode multiband mobile communication terminal is insufficient in performing a handover. Therefore, it is difficult to provide continuous service when handover from an asynchronous mobile communication system to a synchronous mobile communication system. There are many drawbacks.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a continuous service by preventing a communication disconnection by providing a synchronous modem driving method and a cell searching method during handover between an asynchronous mobile communication system and a synchronous mobile communication system. There is a technical problem to provide a control method of a multi-mode multi-band mobile communication terminal.

In order to achieve the above technical problem, a method for controlling a mobile communication terminal for handover between an asynchronous network and a synchronous network is performed as the mobile communication terminal using a service of the asynchronous mobile communication system moves to a synchronous area. The asynchronous modem unit receives a dummy pilot signal from the synchronous mobile communication system, causes the synchronous modem unit of the mobile communication terminal to be driven and searches for a handover target cell, and sends the handover target cell search result to the asynchronous mobile communication system. Reporting and transmitting a channel assignment message to the synchronous modem unit in response to receiving a handover command from the asynchronous mobile communication system; Switching a vocoder and turning off the asynchronous modem; And a third step of acquiring synchronization with the synchronous mobile communication system by the synchronous modem unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a mobile communication terminal means a multi-mode multiband mobile communication terminal that can be used in both asynchronous synchronous mobile communication systems. The mobile communication terminal can receive a synchronous mobile communication system signal using a synchronous modem unit while using a service of an asynchronous mobile communication system, and a signal and a synchronous mobile communication system using a synchronous modem unit while using a service of an asynchronous mobile communication system. It can be divided into a form that can transmit and receive, a detailed description will be described later.

1 is a block diagram of a mobile communication network to which the present invention is applied.

The multi-mode multiband mobile communication terminal 10 may use a voice and data service by wirelessly connecting the asynchronous mobile communication system 20 and the synchronous mobile communication system 30, respectively.

The asynchronous mobile communication system 20 is a wireless network controller (Node B / RNC, 210) for controlling Node B and Node B as a base station for wireless section communication with the mobile communication terminal 10, wireless network controller 210 Short service center connected with the asynchronous exchange (MSC, 220), the asynchronous exchange 220 and the No.7 common signal network 230 to perform a call exchange for providing a service to the mobile communication terminal (10) (SMSC, 240), the intelligent network controller (SCP, 250) and home location register (HLR, 260), the wireless network controller 210 and the GPRS (General Packet Radio Service) network 280 is connected to the mobile communication terminal (10) Is connected via a Serving GPRS Support Node (SGSN) 270, a SGSN 104, and a General Packet Radio Service (GPRS) network 280, which maintains a location track of the &lt; RTI ID = 0.0 &gt; And a Gateway GPRS Support Node (GGSN) 290 connected to and supporting interworking with external packets.

In addition, the synchronous mobile communication system 30 is connected to the mobile communication terminal 10 and the base station controller (BTS / BSC, 310) for controlling the base station and the base station for supporting the wireless section communication, and connected to one or more base station controller to perform a call exchange Short-term service center (SMSC, 340), intelligent network controller (SCP, 350) and home location register (HLR) connected through an exchange (MSC) 320, an exchange 320, and a No. 7 common signaling network 330 to perform 360, a data core network for supporting a connection between a packet data service node (PDSN, 370) and a packet data service node 370 and the Internet 40 to be connected to a base station controller to provide a packet data service to a subscriber ( DCN, 380 is configured.

The switches 220 and 320 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 are interconnected by the No. 7 common signal networks 230 and 330, and the handover of the mobile communication terminal 10 is performed. Send and receive the necessary information. In addition, the home location registers 260 and 360 may be implemented as a dual stack home location register. The home location registers 260 and 360 may store and manage subscriber information, additional service usage status, and provide subscriber information according to a request of the exchange 220 or 320. .

In such a system environment, as the mobile communication terminal 10 having a voice call in the asynchronous mobile communication system region moves to the synchronous mobile communication system region, the mobile communication terminal 10 is asynchronously transmitted from the synchronous mobile communication system 30. When the signal (dummy pilot signal) is detected, and the dummy pilot signal exceeds the specified threshold, communication with the synchronous mobile communication system is started.

2 is a structural diagram of a mobile communication terminal applied to the present invention.

As shown, the multi-mode multi-band mobile communication terminal 10 applied to the present invention includes an antenna 100, a module 110 for a synchronous mobile communication service, a module 120 and a common module for an asynchronous mobile communication service. And 130.

The antenna 100 may simultaneously process a frequency band for a synchronous mobile communication service and a frequency band for an asynchronous mobile communication service.

The synchronization module 110 includes a duplexer 111 that operates as a band pass filter for separating and processing respective frequencies, a synchronous wireless transceiver 112 for separating transmission and reception radio waves into a predetermined frequency band, and a wireless section with a synchronous mobile communication system. The asynchronous module 120 includes a synchronous modem unit 113 for processing a protocol, and the asynchronous module 120 divides each frequency into a duplexer 121 that operates as a band pass filter, and asynchronous radios for separating transmission and reception radio waves into predetermined frequency bands. It includes a transmitting and receiving unit 122 and an asynchronous modem unit 123 for processing a wireless section protocol with the asynchronous mobile communication system.

The common module 130 includes 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 113 and the asynchronous modem unit 123 and perform multimedia functions.

In addition, the multi-mode multi-band mobile communication terminal 10 is equipped with software for the user interface, additional services, mobility management, connection / session control, resource control, protocol processing, so that the user can use a variety of application services, Handover is performed and protocol conversion is performed according to the mobile communication system.

The mobile communication terminal described above is a terminal capable of receiving a signal of a synchronous mobile communication system while using a service of an asynchronous mobile communication system, and a terminal capable of transmitting and receiving a signal with a synchronous mobile communication system while using a service of an asynchronous mobile communication system. Can be distinguished. In the case of a mobile communication terminal capable of transmitting and receiving a signal with a synchronous mobile communication system while using a service of an asynchronous mobile communication system, a device configuration such as duplexers 111 and 121 becomes somewhat more complicated than a mobile communication terminal capable of receiving a signal only, Designed to take into account impacts.

3 is a conceptual diagram of handover in a mobile communication network in which an asynchronous network and a synchronous network are mixed.

In one mobile communication system, handover (or handoff) refers to a technology that enables a user to communicate without disconnection when a mobile communication terminal moves from one cell to another cell of the mobile communication system.

The present invention is a handover method of a multi-mode multiband mobile communication terminal in a network in which a synchronous mobile communication system and an asynchronous mobile communication system are mixed, wherein the mobile communication terminal 10 moves from a synchronous area B to an asynchronous area A. In the case of moving and the case in which the mobile communication terminal 10 moves from the asynchronous area A to the synchronization area B, only the latter will be described.

As the mobile communication terminal 10 using the service in the asynchronous area A approaches the synchronization area B, the mobile communication terminal 10 receives the dummy pilot signal transmitted from the base station of the synchronous mobile communication system. do. Since the dummy pilot signal has the same frequency as that used in the asynchronous mobile communication system, the mobile communication terminal 10 in which the asynchronous modem unit is activated can easily search for a signal transmitted from the base station of the synchronous mobile communication system.                     

4 is a graph illustrating a change in strength of a dummy pilot signal according to movement of a mobile communication terminal.

As the mobile communication terminal moves to the synchronization region, the strength of the signal S1 received from the asynchronous mobile communication system gradually decreases, and the strength of the dummy pilot signal S2 received from the base station of the synchronous mobile communication system gradually increases. It can be seen. As such, when the strength of the dummy pilot signal S2 gradually increases to be greater than or equal to the specified threshold value T, the mobile communication terminal turns on the synchronous modem unit to communicate with the synchronous mobile communication system.

After turning on the synchronous modem unit (ON), the mobile communication terminal searches for the base station of the synchronous mobile communication system and reports the result of the base station search to the asynchronous mobile communication system through the asynchronous modem. Subsequently, a procedure for accessing the synchronous mobile communication system is performed according to a handover command of the asynchronous mobile communication system, which can be divided into two types according to the type of mobile communication terminal. That is, the handover depends on whether the terminal can receive a signal of the synchronous mobile communication system while using the service of the asynchronous mobile communication system, or whether the terminal can transmit or receive a signal to or from the synchronous mobile communication system while using the service of the asynchronous mobile communication system. The mobile communication terminal for the can be controlled differently.

5 is a flowchart illustrating a method for controlling a mobile communication terminal according to an embodiment of the present invention, in which the mobile communication terminal is capable of receiving a signal from a synchronous mobile communication system while using a service of an asynchronous mobile communication system. The control method of the mobile communication terminal is shown.

As the mobile communication terminal using the service of the asynchronous mobile communication system moves to the synchronous area, the asynchronous modem unit of the mobile communication terminal receives a dummy pilot signal from the synchronous mobile communication system (S100). Here, since the dummy pilot signal has the same frequency as the signal used in the asynchronous mobile communication system, the asynchronous modem unit of the mobile communication terminal can easily search for it.

The asynchronous modem unit of the mobile communication terminal receiving the dummy pilot signal transmits a message requesting to drive the synchronous modem to the synchronous modem unit (S102). Accordingly, the synchronous modem unit performs the initialization procedure of the modem and the pilot of the synchronous mobile communication system. A preparation for searching for a channel is made (S104). Thereafter, after searching for a pilot channel of the synchronous mobile communication system (S106), the pilot channel search result is reported to the asynchronous modem unit, that is, the cell search result of the synchronous mobile communication system to be handed over (S108).

Accordingly, the asynchronous modem unit transmits a cell search result of the synchronous mobile communication system to the asynchronous mobile communication system (S110), and upon receiving the asynchronous mobile communication system based on the cell search result, whether the handover is performed and the cell to be handed over. Make a decision, etc. Meanwhile, the synchronous modem unit searches for a synchronous channel of the synchronous mobile communication system (S112) and transitions to an idle state (S114).

Thereafter, the asynchronous mobile communication system instructs to perform handover to the asynchronous modem unit of the mobile communication terminal (S116), and the asynchronous modem unit transmits a channel assignment message to the synchronous modem unit (S118). Here, the channel assignment message includes the parameters necessary for the synchronous modem to transition from the idle state to the traffic state.

After the synchronous modem unit receives the channel assignment message, it switches the vocoder, turns off the asynchronous modem unit (S120), and transitions to the traffic state (S122). Next, in order to synchronize with the synchronous mobile communication system, reverse traffic is transmitted (S124), and the handover is reported to the base station of the synchronous mobile communication system (S126).

Since the mobile communication terminal applied to the present embodiment is a terminal capable of only receiving a signal from the synchronous mobile communication system during service use of the asynchronous mobile communication system, the synchronous modem unit should transmit reverse traffic after the asynchronous modem unit is turned off.

6 is a flowchart illustrating a method for controlling a mobile communication terminal according to another embodiment of the present invention, in which the mobile communication terminal can transmit and receive signals to and from a synchronous mobile communication system while using a service of an asynchronous mobile communication system. A mobile communication terminal control method is shown.

In the present embodiment, a process of transmitting a handover command to the asynchronous modem by the asynchronous mobile communication system from the process of receiving the dummy pilot signal and driving the synchronous modem unit to transmit the channel assignment message to the synchronous modem unit is shown in FIG. It is the same as the method for controlling a mobile terminal described in step 5.

That is, as the mobile communication terminal using the service of the asynchronous mobile communication system moves to the synchronous area, the asynchronous modem unit of the mobile communication terminal receives a dummy pilot signal from the synchronous mobile communication system (S200), and the asynchronous modem unit is a synchronous modem. A negative request is made to drive the synchronous modem (S202).                     

Accordingly, the synchronous modem unit prepares for initializing the modem and searching for a pilot channel of the synchronous mobile communication system (S204). After searching for a pilot channel of the synchronous mobile communication system (S206), the synchronous modem unit performs handover to the asynchronous modem unit. The cell search result of the mobile communication system is reported (S208).

Subsequently, as the asynchronous modem unit transmits the cell search result of the synchronous mobile communication system to the asynchronous mobile communication system (S210), the asynchronous mobile communication system determines whether to perform handover and determine a handover target cell based on the cell search result. Perform. On the other hand, the synchronous modem unit searches for the synchronous channel of the synchronous mobile communication system (S212) and transitions to the idle state (S214), and if the asynchronous mobile communication system instructs to perform a handover (S216), the asynchronous modem The unit transmits a channel assignment message to the synchronous modem unit (S218).

Next, the synchronous modem unit transitions to the traffic state (S220), and transmits reverse traffic in order to synchronize with the synchronous mobile communication system (S222). Next, the synchronous modem unit reports to the base station of the synchronous mobile communication system that the handover is completed (S224), switches the vocoder and turns off the asynchronous modem (S226).

Since the mobile communication terminal applied to the present embodiment has a function of transmitting a signal to the synchronous mobile communication system while using the asynchronous mobile communication system service, the mobile communication terminal transmits backward traffic to the synchronous mobile communication system before turning off the asynchronous modem unit to move synchronously. Synchronize with the communication system. The present embodiment can provide a more improved service compared to a mobile communication terminal capable of receiving a signal of a synchronous mobile communication system while the mobile communication terminal is using an asynchronous mobile communication service. That is, in the case of a mobile communication terminal capable of receiving a signal of a synchronous mobile communication system while using an asynchronous mobile communication service, the synchronization is synchronized with the synchronous mobile communication system after turning off the asynchronous modem unit. Will be. However, the mobile communication terminal capable of transmitting and receiving signals with the synchronous mobile communication system during the use of the asynchronous mobile communication service is almost silent because the asynchronous modem is turned off after synchronizing with the synchronous mobile communication system.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. 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.

The present invention described above facilitates cell search and activation of a synchronous modem unit in a synchronous mobile communication system for handover of a multimode multiband mobile communication terminal in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed. The call disconnection phenomenon can be prevented at the time of handover, and thus the service quality can be improved by providing continuous service.

Claims (5)

A mobile communication terminal control method for handover of a multimode multiband mobile communication terminal having an asynchronous modem unit and a synchronous modem unit in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, As the mobile communication terminal using the service of the asynchronous mobile communication system moves to the synchronous area, the asynchronous modem unit of the mobile communication terminal receives a dummy pilot signal from the synchronous mobile communication system, and the synchronous modem unit of the mobile communication terminal Transmit the channel assignment message to the synchronous modem unit in response to receiving a handover command from the asynchronous mobile communication system by reporting the handover target cell search result to the asynchronous mobile communication system. A first process of doing; Switching a vocoder and turning off the asynchronous modem; And A third step of acquiring synchronization with the synchronous mobile communication system by the synchronous modem; Mobile communication terminal control method for a handover comprising a. A mobile communication terminal control method for handover of a multimode multiband mobile communication terminal having an asynchronous modem unit and a synchronous modem unit in a mobile communication network in which an asynchronous mobile communication system and a synchronous mobile communication system are mixed, The multi-mode multi-band mobile communication terminal is a mobile communication terminal capable of transmitting and receiving signals with the synchronous mobile communication system while using the service of the asynchronous mobile communication system, As the mobile communication terminal using the service of the asynchronous mobile communication system moves to the synchronous area, the asynchronous modem unit of the mobile communication terminal receives a dummy pilot signal from the synchronous mobile communication system, and the synchronous modem unit of the mobile communication terminal Transmit the channel assignment message to the synchronous modem unit in response to receiving a handover command from the asynchronous mobile communication system by reporting the handover target cell search result to the asynchronous mobile communication system. A first process of doing; A second step of acquiring synchronization with the synchronous mobile communication system by the synchronous modem; And A third step of switching a vocoder and turning off the asynchronous modem unit; Mobile communication terminal control method for a handover comprising a. The method according to claim 1 or 2, The dummy pilot signal has a frequency equal to the frequency used in the asynchronous mobile communication system. The method according to claim 1 or 2, The first process may include: receiving, by the asynchronous modem unit, a dummy pilot signal from a base station of the synchronous mobile communication system; Requesting the asynchronous modem unit to drive a synchronous modem with the synchronous modem unit; Performing, by the synchronous modem unit, an initialization procedure of the synchronous modem and searching for a pilot channel of a synchronous mobile communication system; Reporting, by the synchronous modem unit, a pilot channel search result that is a cell search result of a synchronous mobile communication system to the asynchronous modem unit; Transmitting, by the asynchronous modem unit, a cell search result of a synchronous mobile communication system to the asynchronous mobile communication system; Searching, by the synchronous modem unit, a synchronous channel of the synchronous mobile communication system and transitioning to an idle state; And In response to the asynchronous mobile communication system instructing to perform a handover to the asynchronous modem unit, transmitting the channel assignment message to the asynchronous modem unit; Mobile communication terminal control method for a handover comprising a. The method according to claim 1 or 2, The process of acquiring synchronization with the synchronous mobile communication system by the synchronous modem may include transitioning to the traffic state by the synchronous modem; Transmitting, by the synchronous modem unit, reverse traffic to a base station of the synchronous mobile communication system; And Reporting, by the synchronous modem unit, that handover is completed to the synchronous mobile communication system; Mobile communication terminal control method for a handover comprising a.

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