KR101090525B1 - Method for Hand-over to the Wireless Broadband Network and Mobile Communication Terminal Therefor - Google Patents

Method for Hand-over to the Wireless Broadband Network and Mobile Communication Terminal Therefor Download PDF

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Publication number
KR101090525B1
KR101090525B1 KR1020040087813A KR20040087813A KR101090525B1 KR 101090525 B1 KR101090525 B1 KR 101090525B1 KR 1020040087813 A KR1020040087813 A KR 1020040087813A KR 20040087813 A KR20040087813 A KR 20040087813A KR 101090525 B1 KR101090525 B1 KR 101090525B1
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South Korea
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communication system
wibro
mobile communication
modem unit
connection
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KR1020040087813A
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Korean (ko)
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KR20060038693A (en
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신시몬
김정철
유재황
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에스케이 텔레콤주식회사
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Abstract

The present invention relates to a handover method for a WiBro network providing a handover service to a WiBro network using a T-mode mobile communication terminal, and a mobile communication terminal for the same. The first modem unit of the mobile communication terminal, It operates preferentially when searching for an initial access signal, and searches for a signal of a WiBro communication system, and when a connection with the WiBro communication system is not possible, transmits a network connection request signal to a second modem unit, and the mobile communication terminal is an asynchronous mobile communication system. Alternatively, when connected to the 1x EV-DO communication system, switch to the sleep mode,

When receiving the communication network connection request signal transmitted from the first modem unit, the second modem unit attempts to connect to the asynchronous mobile communication system or the 1x EV-DO communication system, and transmits the signal to the first modem unit when the connection is completed. By enabling the transition to the sleep mode, there is an advantage that the services provided based on the WiBro network can be utilized more efficiently.

WiBro communication system, multimode, mobile communication terminal

Description

Method for handover to WiBro network and a mobile communication terminal for the same {Method for Hand-over to the Wireless Broadband Network and Mobile Communication Terminal Therefor}

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

2 is a view showing the configuration of a mobile communication terminal according to the present invention;

3 is a view for explaining a handover method to a WiBro network according to the present invention;

4 is a flowchart for explaining an embodiment of a handover method according to the present invention;

5 is a flowchart illustrating another embodiment of a handover method according to the present invention.

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

100: mobile communication terminal 110: antenna

120: first module 122, 132: duplexer

124: first wireless transceiver 126: a first modem unit

130: second module 134: second wireless transceiver

136: second modem unit 140: common module

200: asynchronous mobile communication system 210: node B                 

220: RNC 230: Asynchronous MSC

240: SGSN 250: GPRS

260: GGSN 300: WiBro communication system

310: RAS 320: ACR

400: 1x EV-DO Communication System 410: BTS

420: BSC / PCF 430: MSC

440: PDSN 500: IWU

The present invention relates to a handover method for a WiBro network and a mobile communication terminal therefor, and more particularly, to a handover method for a WiBro network providing a handover service to a WiBro network using a multi-mode mobile communication terminal. It relates to a mobile communication terminal for this purpose.

Mobile communication networks provide wireless Internet services through mobile communication terminals based on WAP (Wirless Application Protocol) or WIPI platforms, but due to various technical limitations such as small screen, low resolution and low data rate of mobile communication terminals Difficulties have arisen in providing Internet services that can be secured in a wired environment.

On the other hand, with the proliferation of notebook PCs and wireless LAN equipment, we are providing services to use the Internet wirelessly at home based on ADSL or public wireless LAN. However, wireless LAN is technically limited to a few tens of meters. Because it can be covered, many sites must be secured in order to be used as a public network, which requires a large investment cost.

In order to overcome the limitations of the wireless Internet service, a wireless broadband (WiBro) has been developed that enables high-speed Internet access even during stationary or slow travel.

Currently, various services are being developed and provided based on the mobile internet, and as the service area of the mobile internet system overlaps the service area of the asynchronous mobile communication system or the 1x EV-DO communication system, the mobile internet system and the asynchronous mobile communication system are provided. Or a handover between 1x EV-DO communication system is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and a handover method for a handover to a WiBro network using a mobile communication terminal which attempts to access the WiBro network preferentially, and a move therefor There is a technical problem in providing a communication terminal.

The present invention for achieving the above object is a first modem unit for processing a wireless section protocol with the WiBro communication system, and a second modem unit for processing a wireless section protocol with an asynchronous mobile communication system or 1x EV-DO communication system A mobile communication terminal for performing handover between the asynchronous mobile communication system and the WiBro communication system or the 1x EV-DO communication system.

The first modem unit preferentially operates when searching for an initial connection signal with a communication network, searches for a signal of the WiBro communication system, and transmits a network connection request signal to the second modem unit when the connection with the WiBro communication system is impossible. When the mobile communication terminal is connected to the asynchronous mobile communication system or the 1x EV-DO communication system, the mobile communication terminal switches to a sleep mode.

When the second modem unit receives a communication network connection request signal transmitted from the first modem unit, the second modem unit attempts to connect to the asynchronous mobile communication system or the 1x EV-DO communication system, and when the connection is completed, to the first modem unit. Transmit signal to enable sleep mode.

Another embodiment of the present invention provides a handover method to a WiBro network using a mobile communication terminal performing a handover between an asynchronous mobile communication system or a 1x EV-DO communication system and a WiBro communication system.

First searching for a signal of the WiBro communication system when the mobile communication terminal is powered on; As a result of the first step, if the connection with the WiBro communication system is possible, the connection is performed, and if the connection with the WiBro communication system is impossible, with the asynchronous mobile communication system or the 1x EV-DO communication system. A second step of attempting to connect; A third step of switching to a sleep mode when connected to the asynchronous mobile communication system or the 1x EV-DO communication system; A fourth step of searching for a signal of the WiBro communication system to determine whether a connection with the WiBro communication system is possible when a preset time arrives; As a result of the fourth step, when the connection with the WiBro communication system is possible, a fifth step of releasing the sleep mode and transmitting a connection request signal to the WiBro communication system.

In the present invention, the WiBro communication system (WiBro: Wireless Broadband) refers to a network capable of high-speed wireless Internet access even when stopped and moving by using a portable Internet terminal.

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

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

The mobile communication terminal 100 applied to the present invention is a multi-mode mobile communication terminal 100 capable of simultaneously providing a plurality of data network services (for example, asynchronous mobile communication service, WiBro communication service, and 1x EV-DO communication service). As a wireless communication system 200, a WiBro (Wireless Broadband) communication system 300 and a 1x EV-DO (Evolution Data Only) communication system 400 may be selectively wirelessly connected to use a data service. A detailed description will be described later with reference to FIGS. 2 and 3. The mobile communication terminal 100 has a function of first attempting connection with the WiBro communication system 300 among the data networks 200, 300, and 400.

The asynchronous mobile communication system 200 is a node B 210 as a base station for wireless section communication with the mobile communication terminal 100, a radio network controller (RNC, 220) for controlling the node B 210, a radio network controller. An asynchronous exchange (MSC) 230, a wireless network controller 220, and a general packet radio service (GPRS) network 250 that is connected to the 220 and performs a call exchange for providing a voice service to the mobile communication terminal 100. Is connected between the Serving GPRS Support Node (SGSN 240), the SGSN 240, and the GPRS 250, which maintains a location track of the mobile communication terminal 100 and performs access control and security functions. And a Gateway GPRS Support Node (GGSN) 260 connected to the Inter Working Unit 500 to support interworking with the WiBro communication system 300.

In addition, the WiBro communication system 300 performs a radio resource management and control function in the WiBro communication system 300, and supports a handover between the WiBro communication system 300 and another network (RAS) (Radio Access Station, 310) and ACR (Access Control Router, 320) that manages IP routing and mobility, and performs authentication and security functions. The ACR 320 controls the movement between the RAS 310 in the ACR 320.

The asynchronous mobile communication system 200 and the WiBro communication system 300 are interconnected to the IWU 500 to transmit and receive information necessary for handover of the mobile communication terminal 100.

Although not shown, the mobile communication terminal 100 and the RAS 310 are U-interfaces, the RAS 310 and the ACR 320 are A-interfaces, and at least one ACR 320 is an IR-interface, ACR Devices in 320 and asynchronous mobile communication system 200 are each configured with an I-interface.                     

1x EV-DO communication system 400 is a base station (BTS, 410) for supporting wireless section communication with the mobile communication terminal 100, the base station controller (BSC, 420) for controlling the base station 410 and a packet data service A packet control function (PCF) 420 that performs a role similar to that of the base station controller 420 when providing a packet data service such as radio resource management for the mobile station, and is connected to one or more base station controllers 420 to perform a call exchange. A packet data service for providing a packet data service to a subscriber by performing a foreign agent (FA) function for accessing a switch (MSC) 430 and a packet controller 420 to register a location of the mobile communication terminal 100. Node PDSN 440.

Here, the packet data service node 400 of the 1x EV-DO communication system 400 is connected to the IWU 500 to transmit and receive signals with the asynchronous mobile communication system 200 or the WiBro communication system 300, respectively.

2 is a view showing the configuration of a mobile communication terminal according to the present invention.

As shown, the mobile communication terminal 100 applied to the present invention includes an antenna 110, a first module 120 for a WiBro communication service, and a second module 130 for an asynchronous or 1x EV-DO mobile communication service. ) And common module 140.

The antenna 110 may simultaneously process a frequency band for the asynchronous mobile communication service / 1x EV-DO communication service and a frequency band for the WiBro communication service.

The first module 120 for providing a WiBro communication service includes a duplexer 122 that operates as a band pass filter for processing each frequency, and a first wireless transceiver 124 for separating transmission and reception radio waves into a predetermined frequency band. And a first modem unit 126 for processing a wireless section protocol with the WiBro communication system 300.

In addition, the second module 130 for providing an asynchronous mobile communication service or a 1x EV-DO communication service includes a duplexer 132 that operates as a band pass filter that processes each frequency, and transmits and receives radio waves to a predetermined frequency band. And a second modem unit 136 for processing a wireless section protocol with the second wireless transceiver 134 and the asynchronous mobile communication system 200 or the 1x EV-DO communication system 400 to be separated.

The common module 140 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 first modem unit 126 and the second modem unit 136 and perform multimedia functions. do.

In more detail, the first modem unit 126 operates preferentially when the mobile communication terminal 100 is powered on and attempts initial connection with the communication network. The search and connection is attempted, and when connected to the WiBro communication system 300, the reception power level of the WiB communication system 300 is periodically monitored.

In addition, while the mobile communication terminal 100 is connected to the WiBro communication system 300, the received power level value of the WiBro communication system 300 is measured to be equal to or less than a reference value for a preset time, or when the initial connection is performed, the WiBro communication system 300 ), The first modem unit 126 transmits a signal to the second modem unit 136 under the control of the common module 140 to transmit a signal to the asynchronous mobile communication system 200 or 1x EV. Try to search for and connect to the DO communication system 400.                     

When the second modem unit 136 receives a signal transmitted from the first modem unit 126, the second modem unit 136 searches for a signal of the asynchronous mobile communication system 200 or the 1x EV-DO communication system 400 and attempts to connect.

Subsequently, when one of the asynchronous mobile communication system 200 or the 1x EV-DO communication system 400 and the second modem unit 136 are connected, the first modem unit 126 is in a sleep mode. Switch to, and search for a signal of the WiBro communication system 300 at a predetermined cycle under the control of the common module 140 to determine whether the connection with the WiBro communication system 300 is possible. When the connection with the WiBro communication system 300 is possible, the first modem unit 126 releases the sleep mode under the control of the common module 140 and performs communication with the WiBro communication system 300. Here, the sleep mode refers to a mode in which the power is on but in a low power state, and the sleep mode reduces power consumption.

3 is a view for explaining a handover method to the WiBro network according to the present invention, a handover between the WiBro communication system 300 and the asynchronous mobile communication system 200 will be described as an example.

3, A denotes a serviceable area of the asynchronous mobile communication system 200, B denotes a serviceable area of the WiBro communication system 300, and C denotes a service area and a WiBro of the asynchronous mobile communication system 200. A handover area in which service areas of the communication system 300 overlap each other.

While the first modem unit 126 of the mobile communication terminal 100 located in the region B is transmitting and receiving a signal with the WiBro communication system 300, the mobile communication terminal 100 moves (B-> C-> A). When the signal strength of the WiBro communication system 300 is weakened, the signal is transmitted to the second modem unit 136 to perform connection with the asynchronous mobile communication system 200. Here, the first modem unit 126 of the mobile communication terminal 100 monitors the received power level of the WiBro communication system 300, so that the received power level value of the WiBro communication system 300 is less than or equal to the reference value for a preset time. If measured as, the second modem unit 136 transmits a signal for requesting handover.

If the mobile communication terminal 100 is powered on in the area A or the area C, the mobile communication terminal 100 first attempts to connect by searching for a signal of the WiBro communication system 300, and the WiBro communication system 300 If it is impossible to connect with), it attempts to connect with the asynchronous mobile communication system 200. After the mobile communication terminal 100 is connected to the asynchronous mobile communication system 200, the first modem unit 126 of the mobile communication terminal 100 switches to the sleep mode, and with the WiBro communication system 300 at predetermined intervals. Check whether the connection is available.

4 is a flowchart illustrating an embodiment of a handover method according to the present invention.

The mobile communication terminal 100 disclosed in FIG. 4 is a multi-mode mobile communication terminal, and can selectively connect with the asynchronous mobile communication system 200, the WiBro communication system 300, and the 1x EV-DO communication system 400. Can be.

When the mobile communication terminal 100 is powered on (S101), the first modem unit 126 communicating with the WiBro communication system 300 first searches for a signal of the WiBro communication system 300 (S103). ).

Thereafter, the first modem unit 126 checks whether the connection with the WiBro communication system 300 is possible based on the signal search result of step S103 (S105).

As a result of step S105, the connection between the first modem unit 126 and the WiBro communication system 300 is lost because the signal strength of the WiBro communication system 300 is weak or the signal of the WiBro communication system 300 is not detected. If it is impossible, the first modem unit 126 transmits a connection request signal with another network (for example, 200 or 400) to the second modem unit 136 (S107).

When the second modem unit 136 receives a signal transmitted from the first modem unit 126, the second modem unit 136 searches for a signal of the asynchronous mobile communication system 200 or a signal of the 1x EV-DO communication system 400 (S109). As a result of S109, the access request signal is transmitted to the corresponding system 200 or 400 to be searched (S111). Here, the second modem unit 136 transmits a connection request signal to a system having a greater signal strength among signals of the asynchronous mobile communication system 200 and signals of the 1x EV-DO communication system 400.

Subsequently, when the second modem unit 136 receives a response signal transmitted from the mobile communication system 200 or 400 (S113), the second modem unit 136 and the mobile communication system 200 or 400 are connected to each other. In operation S115, a signal for data service is transmitted and received.

Thereafter, the second modem unit 136 transmits a connection confirmation signal with the mobile communication system 200 or 400 to the first modem unit 126 (S117).                     

When the first modem unit 126 receives the connection confirmation signal transmitted from the second modem unit 136, the first modem unit 126 switches to the sleep mode (S119) and periodically checks whether or not the preset time is reached ( S121).

When the predetermined time arrives as a result of step S121, the first modem unit 126 searches for a signal of the wibro communication system 300 and checks whether or not the connection with the wibro communication system 300 is possible (S123).

As a result of step S123, when the connection with the WiBro communication system 300 is possible, the first modem unit 126 releases the sleep mode (S125) and transmits a connection request signal to the WiBro communication system 300 (S127). ).

Subsequently, when the first modem unit 126 receives the response signal transmitted from the WiBro communication system 300 (S129), the first modem unit 126 and the WiBro communication system 300 are interconnected (S131). Send and receive signals for data services. Thereafter, the first modem unit 126 monitors the Rx power level of the WiBro communication system 300. When the received power level value is measured to be equal to or less than the reference value for a preset time, the second modem unit 136 Transmits a handover signal to perform a connection with the mobile communication system 200 or 400.

In addition, when the first modem unit 126 is connected to the WiBro communication system 300, the first modem unit 126 notifies the second modem unit 136 to release the connection between the second modem unit 136 and the mobile communication system 200 or 400. (S133).

Thereafter, the second modem unit 136 transmits a connection release request signal to the mobile communication system 200 or 400 (S135), and receives a response thereto (S137).

On the other hand, when the first modem unit 126 is able to connect with the WiBro communication system 300 as a result of step S105, the first modem unit 126 performs the procedure of step S200. Thereafter, the first modem unit 126 monitors the Rx power level of the WiBro communication system 300. When the received power level value is measured to be equal to or less than the reference value for a preset time, the second modem unit 136 Transmits a handover signal to perform a connection with the mobile communication system 200 or 400.

On the other hand, when the preset time is not reached as a result of step S121, the first modem unit 126 repeats the procedure after step S121.

If the first modem unit 126 cannot connect to the WiBro communication system 300 as a result of step S123, the first modem unit 126 performs the procedure after step S121.

5 is a flowchart illustrating another embodiment of a handover method according to the present invention.

The mobile communication terminal 100 disclosed in FIG. 5 is a multi-mode mobile communication terminal, and can selectively connect with the asynchronous mobile communication system 200, the WiBro communication system 300, and the 1x EV-DO communication system 400. Can be.

The first modem unit 126 of the mobile communication terminal 100 monitors the Rx power level of the WiBro communication system 300 while performing data communication with the WiBro communication system 300 (S201). ).

Subsequently, the first modem unit 126 checks the monitoring result and checks whether the received power level value of the WiBro communication system 300 is equal to or less than the reference value (S203).

As a result of step S203, when the received power level value is equal to or less than the reference value and the received power level value continues to be measured to be equal to or less than the reference value for a preset time, the first modem unit 126 goes to the second modem unit 136 for example. For example, a connection request signal with 200 or 400 is transmitted (S205).

When the second modem unit 136 receives a signal transmitted from the first modem unit 126, the second modem unit 136 searches for a signal of the asynchronous mobile communication system 200 or a signal of the 1x EV-DO communication system 400 (S207). As a result of S207, the access request signal is transmitted to the corresponding system 200 or 400 to be searched (S209). Here, the second modem unit 136 transmits a connection request signal to a system having a greater signal strength among signals of the asynchronous mobile communication system 200 and signals of the 1x EV-DO communication system 400.

Subsequently, when the second modem unit 136 receives a response signal transmitted from the mobile communication system 200 or 400 (S211), the second modem unit 136 and the mobile communication system 200 or 400 are connected to each other. In operation S213, a signal for data service is transmitted and received.

Thereafter, the second modem unit 136 transmits a connection confirmation signal with the mobile communication system 200 or 400 to the first modem unit 126 (S215).

When the first modem unit 126 receives the connection confirmation signal transmitted from the second modem unit 136, the first modem unit 126 switches to the sleep mode (S217), and periodically checks whether or not the preset time is reached ( S219).

When the predetermined time arrives as a result of step S219, the first modem unit 126 searches for the signal of the wibro communication system 300 and checks whether the connection with the wibro communication system 300 is possible (S221).

As a result of step S221, when the connection with the WiBro communication system 300 is possible, the first modem unit 126 releases the sleep mode (S223) and transmits a connection request signal to the WiBro communication system 300 (S225). ).

Subsequently, when the first modem unit 126 receives the response signal transmitted from the WiBro communication system 300 (S227), the first modem unit 126 and the WiBro communication system 300 are interconnected (S229), Send and receive signals for data services. Thereafter, the first modem unit 126 monitors the Rx power level of the WiBro communication system 300. When the received power level value is measured to be equal to or less than the reference value for a preset time, the second modem unit 136 Transmits a handover request signal to perform connection with the mobile communication system 200 or 400.

In addition, when the first modem unit 126 is connected to the WiBro communication system 300, the first modem unit 126 notifies the second modem unit 136 to release the connection between the second modem unit 136 and the mobile communication system 200 or 400. (S231).

Thereafter, the second modem unit 136 transmits a connection release request signal to the mobile communication system 200 or 400 (S233), and receives a response thereto (S235).

On the other hand, when the reception power level value of the WiBro communication system 300 is not equal to or less than the reference value as a result of step S203, the first modem unit 126 repeatedly performs step S201.

On the other hand, when the predetermined time has not come as a result of step S219, the first modem unit 126 repeats the procedure after step S219.

If the first modem unit 126 cannot connect to the WiBro communication system 300 as a result of step S221, the first modem unit 126 performs the procedure after step S219.

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.

As described above, the handover method for the WiBro network of the present invention and the mobile communication terminal for this purpose preferentially attempt to connect with the WiBro network providing high-speed data service when the mobile communication terminal is powered on. There is an advantage that the services provided based on this can be utilized more efficiently.

Claims (10)

And a second modem unit for processing a wireless section protocol with a WiBro communication system, and a second modem section for processing a wireless section protocol with an asynchronous mobile communication system or a 1x EV-DO communication system. A mobile communication terminal performing a handover between a WiBro communication system or a handover between the 1x EV-DO communication system and the WiBro communication system, The first modem unit preferentially operates when searching for an initial connection signal with a communication network, searches for a signal of the WiBro communication system, and transmits a network connection request signal to the second modem unit when the connection with the WiBro communication system is impossible. When the mobile communication terminal is connected to the asynchronous mobile communication system or the 1x EV-DO communication system, the mobile communication terminal switches to a sleep mode. When the second modem unit receives a communication network connection request signal transmitted from the first modem unit, the second modem unit attempts to connect to the asynchronous mobile communication system or the 1x EV-DO communication system, and when the connection is completed, to the first modem unit. Mobile communication terminal, characterized in that for transmitting a signal to switch to the sleep mode. The method of claim 1, When the first modem unit switches to the sleep mode, And the first modem unit searches for a signal of the WiBro communication system to determine whether a connection with the WiBro communication system is possible when a preset time arrives. The method of claim 2, When the first modem unit is connected to the WiBro communication system as a result of a signal search of the WiBro communication system, Canceling the sleep mode and transmitting a connection request signal to the WiBro communication system. The method of claim 3, wherein The first modem unit transmits a connection release request signal to the second modem unit when a connection with the WiBro communication system is possible. The second modem unit, when receiving the connection release request signal transmitted from the first modem unit, and transmits it to the corresponding system to release the connection. The method of claim 1, When the first modem unit is initially connected to the WiBro communication system, the first modem unit periodically monitors a received power level (Rx Power Level) of the WiBro communication system. When measured below, the mobile communication terminal, characterized in that for performing a handover by transmitting a network connection request signal to the second modem unit. The method of claim 1, The second modem unit searches for a signal of the asynchronous mobile communication system or a signal of the 1x EV-DO communication system to connect with a communication system having a greater signal strength among the asynchronous mobile communication system and the 1x EV-DO communication system. Mobile communication terminal, characterized in that attempt. A handover method to a WiBro network using a mobile communication terminal performing a handover between an asynchronous mobile communication system and a WiBro communication system or a handover between a 1x EV-DO communication system and the WiBro communication system, First searching for a signal of the WiBro communication system when the mobile communication terminal is powered on; As a result of the first step, if the connection with the WiBro communication system is possible, the connection is performed, and if the connection with the WiBro communication system is impossible, with the asynchronous mobile communication system or the 1x EV-DO communication system. A second step of attempting to connect; A third step of switching to a sleep mode when connected to the asynchronous mobile communication system or the 1x EV-DO communication system; A fourth step of searching for a signal of the WiBro communication system to determine whether a connection with the WiBro communication system is possible when a preset time arrives; And A fifth step of canceling the sleep mode and transmitting a connection request signal to the WiBro communication system when the connection with the WiBro communication system is possible as a result of the fourth step; Handover method to the WiBro network comprising a. The method of claim 7, wherein After the fifth step, Transmitting a connection release request signal to a corresponding system connected in the third step; Handover method to the wibro network, characterized in that it further comprises. The method of claim 7, wherein The second step, Searching for a signal of the asynchronous mobile communication system or a signal of the 1x EV-DO communication system and attempting to connect with a communication system having a greater signal strength among the asynchronous mobile communication system and the 1x EV-DO communication system; Handover method to the wibro network, characterized in that it further comprises. The method of claim 7, wherein The second step, Periodically monitoring an Rx Power Level of the WiBro communication system when the WiBro communication system is connected to the WiBro communication system and is initially connected to the WiBro communication system; And Attempting connection with the asynchronous mobile communication system or the 1x EV-DO communication system when the received power level value is measured to be equal to or less than a reference value for a preset time as a result of the monitoring; Handover method to the wibro network, characterized in that it further comprises.
KR1020040087813A 2004-11-01 2004-11-01 Method for Hand-over to the Wireless Broadband Network and Mobile Communication Terminal Therefor KR101090525B1 (en)

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KR101091037B1 (en) * 2004-11-05 2011-12-09 에스케이텔레콤 주식회사 Method for Hand-over Using the Neighbor BTS List and Mobile Communication System therefor
KR100741376B1 (en) * 2006-07-28 2007-07-20 지씨티 세미컨덕터 인코포레이티드 Method for performing handoff from wibro (wimax) service to wireless lan service and terminal apparatus using the same
KR100896679B1 (en) * 2007-08-02 2009-05-14 에스케이 텔레콤주식회사 Method and System for Handover Between WAVE 1 Equipment and WAVE 2 Equipment
KR101422018B1 (en) * 2007-11-08 2014-07-23 엘지전자 주식회사 a mobile telecommunication device having a mobile wiMAX and a power saving method using the same
KR100964614B1 (en) * 2008-04-28 2010-06-21 주식회사 케이티 Method for controlling handover signaling in hybrid indoor/outdoor wibro system and handover message configuration method in its
KR100970448B1 (en) * 2008-04-29 2010-07-16 주식회사 케이티 Method for controlling indoor handover signaling in hybrid indoor/outdoor wibro system

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