KR101091037B1 - Method for Hand-over Using the Neighbor BTS List and Mobile Communication System therefor - Google Patents

Abstract

The present invention relates to a handover method using neighboring base station information to facilitate handover between a WiBro network and a WCDMA network / EV-DO network by providing base station information of another network, and a mobile communication system for the same.

According to the present invention, a WiBro communication system stores neighbor base station information located in at least one mobile communication system, and a mobile communication terminal located in the WiBro communication system moves to a boundary area between the WiBro communication system and at least one mobile communication system. In the case of providing a neighbor base station information to the mobile communication terminal,

Each of the at least one mobile communication system stores neighbor base station information located in the WiBro communication system, and the mobile communication terminal located in the at least one mobile communication system has a boundary area between the WiBro communication system and the at least one mobile communication system. In case of moving to, the neighboring base station information is provided to the mobile communication terminal, so that the time required for the mobile communication terminal to perform a handover to another network can be shortened.

Handover

Description

Handover Method Using Neighbor Base Station Information and Mobile Communication System for It {Method for Hand-over Using the Neighbor BTS List and Mobile Communication System 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 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: EV-DO communication system 410: BTS

420: BSC / PCF 430: MSC

440: PDSN 500: IWU

The present invention relates to a handover method using neighboring base station information and a mobile communication system for the same. More particularly, the present invention provides neighboring base station information of another network to facilitate handover between a WiBro network and a WCDMA network / EV-DO network. A handover method using base station information and a mobile communication system for the same.

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, but wireless LAN is technically limited area within a few tens of meters. Because it can only cover the bay, a large number of 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 Internet (WiBro) has been developed that enables high-speed Internet access even during stationary or slow travel.

However, there is no method of performing a handover without interruption of service to a data communication network (eg, an EV-DO network or a WCDMA network) in which a mobile communication terminal provided with a data service in the WiBro network does not exist. Did.

In addition, the mobile communication terminal performing the movement between the WiBro network and the other network (for example, EV-DO network or WCDMA network) has a problem that consumes unnecessary power to periodically search for signals of both the WiBro network and the other network. It was.

In addition, the mobile communication system could not provide information on when to perform a handover even when the mobile communication terminal searches for a location of a base station located in another network.

The present invention has been made to solve the above-described problem, the neighboring base station information that the mobile communication network stores the neighboring base station information of the other network, and provides it to the mobile communication terminal to facilitate the handover to the other network There is a technical problem to provide a handover method using and a mobile communication system for the same.

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 for processing a wireless section protocol with at least one mobile communication system except the WiBro communication system A mobile communication system performing communication with a mobile communication terminal including a modem unit and supporting handover between communication systems,

The WiBro communication system stores neighbor base station information located in the at least one mobile communication system, and a mobile communication terminal located in the WiBro communication system is a boundary area between the WiBro communication system and the at least one mobile communication system. In the case of moving to the mobile communication terminal, the neighboring base station information is provided to the mobile communication terminal, each of the at least one mobile communication system stores the adjacent base station information located in the WiBro communication system, and in the at least one mobile communication system When the mobile communication terminal located moves to a boundary area between the WiBro communication system and the at least one mobile communication system, neighboring base station information is provided to the mobile communication terminal.

Another embodiment of the present invention provides a mobile communication including a first modem unit for processing a wireless section protocol with a WiBro communication system, and a second modem unit for processing a wireless section protocol with at least one mobile communication system except for the WiBro communication system. A method of performing communication with a terminal and supporting handover between communication systems,

A first step of transmitting neighbor base station information to the mobile communication terminal; A second step of determining whether a neighbor base station included in the neighbor base station information is a corresponding mobile communication system in which the mobile communication terminal is located or another mobile communication system; If the neighboring base station is a base station located in the same mobile communication system as a result of the determination of the second step, the handover to the base station is performed, and as a result of the determination of the second step, the neighboring base station is located in another mobile communication system. In the case of a base station located in the mobile station, a third step of searching for a signal of a base station located in another mobile communication system and then communicating with the base station is performed.

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 EV-DO communication service). In addition, the asynchronous mobile communication system 200, a WiBro (Wireless Broadband) communication system 300 and the EV-DO (Evolution Data Only) communication system 400 may be selectively connected to the data service to use a data service. 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 ( Asynchronous exchange (MSC) 230, a wireless network controller 220, and a general packet radio service (GPRS) network 250 to perform a call exchange for providing a voice service to the mobile communication terminal 100 in connection with 220). Is connected to a Serving GPRS Support Node (SGSN 240), an SGSN 240, and a 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 working unit 500 to support interworking with the WiBro communication system 300.

In addition, the Node B 210 stores information of an adjacent base station located in the other network (WiBro communication system 300 or EV-DO communication system 400), so that the boundary area between the asynchronous mobile communication system 200 and the other network. The neighbor base station information located in the other network (WiBro communication system 300 or EV-DO communication system 400) is transmitted to the mobile communication terminal 100 located nearby.

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 other networks, and a RAS (Radio Access Station, 310) and ACR (Access Control Router, 320) that manages IP routing and mobility, and performs authentication and security functions.                     

In addition, the RAS 310 stores information of an adjacent base station located in the other network (asynchronous mobile communication system 200 or EV-DO communication system 400), so that the vicinity of the boundary area between the WiBro communication system 300 and the other network The neighboring base station information located in the other network (asynchronous mobile communication system 200 or EV-DO communication system 400) is transmitted to the mobile communication terminal 100 located at.

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 320 and asynchronous mobile communication system 200 are each connected to an I-interface.

The EV-DO communication system 400 includes a base station (BTS, 410) for supporting wireless section communication with the mobile communication terminal (100), a 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, and a switch that is connected to one or more base station controllers 420 to perform a call exchange. (MSC) 430, a packet data service node connected to the packet controller 420 to perform a foreign agent (FA) function for location registration of the mobile communication terminal 100 to provide a packet data service to a subscriber (PDSN, 440).                     

In addition, the BTS 410 stores information of an adjacent base station located in the other network (asynchronous mobile communication system 200 or WiBro communication system 300), so that the EV-DO communication system 400 is near the boundary area between the other network. The neighboring base station information located in the other network (asynchronous mobile communication system 200 or WiBro communication system 300) is transmitted to the mobile communication terminal 100 located at.

Here, the packet data service node 400 of the 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.

The asynchronous mobile communication system 200, the WiBro communication system 300, and the EV-DO communication system 400 disclosed in FIG. 1 perform a handover at the time of handover of the mobile communication terminal 100, and then initially connect with the system. The neighbor base station information is transmitted to the mobile communication terminal 100 at each hour or a predetermined time.

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 at least one communication service (for example, an antenna 110, a first module 120 for a WiBro communication service, and a WiBro communication service). A second module 130 and a common module 140 for asynchronous or EV-DO mobile communication services).

The antenna 110 may simultaneously process a frequency band for the asynchronous mobile communication service / 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 at least one communication service (for example, an asynchronous mobile communication service or an EV-DO communication service) except for the WiBro communication service, the band pass for processing each of the frequencies separately. At least one mobile communication system (eg, asynchronous mobile communication) except for the duplexer 132 acting as a filter, the second wireless transceiver 134 for separating transmission and reception radio waves into a predetermined frequency band, and the WiBro communication system 300. And a second modem unit 136 for processing a wireless section protocol with the system 200 or the EV-DO communication system 400.

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. Search and try to connect.

The operation of the mobile communication terminal 100 is whether the mobile communication terminal 100 is located in a network mixed with the WiBro communication system 300 and the asynchronous mobile communication system 200 or the EV-DO communication system 400 or the WiBro communication system. Depending on whether or not the 300 exists in the other network (non-synchronous mobile communication system 200 or EV-DO communication system 400 exists only network) will be divided into two broad description.

First, when the mobile communication terminal 100 is located in a mixed network of the WiBro communication system 300 and another network (asynchronous mobile communication system 200 or EV-DO communication system 400), the first modem unit 126 ) Receives neighbor base station information transmitted from the WiBro communication system 300, and determines whether the base station having the largest signal strength is located in the WiBro communication system 300 or another network (asynchronous mobile communication system 200 or EV-DO communication system). If the base station having the largest signal strength is located in the WiBro communication system 300, the access request signal is transmitted to the base station.

When the base station with the largest signal strength is not located in the WiBro communication system 300 and is located in another network (asynchronous mobile communication system 200 or EV-DO communication system 400), the first modem unit 126 The neighbor base station information transmitted from the WiBro communication system 300 is transmitted to the second modem unit 136 to communicate with the corresponding base station.

Here, the neighbor base station information is a base station list including at least one base station information adjacent to the base station with which the mobile communication terminal 100 is communicating, including a base station PN code, frequency information, and the like. It also includes base station information of the system 200 or the EV-DO communication system 400.

When the second modem unit 136 receives the neighbor base station information transmitted from the first modem unit 126, the second modem unit 136 transmits a connection request signal to a base station having the largest signal strength and attempts to connect.

When the connection between the second modem unit 136 and the other network is established, the first modem unit 136 terminates the connection with the WiBro communication system 300.

Second, when the mobile communication terminal 100 is located in another network (asynchronous mobile communication system 200 or EV-DO communication system 400) that does not overlap with the WiBro communication system 300, the second modem unit ( When receiving the neighbor base station information transmitted from the asynchronous mobile communication system 200 or the EV-DO communication system 400, 136 checks whether the nearest base station is located in the WiBro communication system 300, When located in the WiBro communication system 300, the second modem unit 136 transfers adjacent base station information transmitted from the asynchronous mobile communication system 200 or the EV-DO communication system 400 to the first modem unit 126. Transmit to communicate with the base station.

When the adjacent base station is located in the asynchronous mobile communication system 200 or the EV-DO communication system 400, the second modem unit 136 attempts to connect with another base station located in the same network.

3 is a view for explaining a handover method according to the present invention.

The network A shown in FIG. 3 is a network in which the WiBro communication system 300 and the other network (asynchronous mobile communication system 200 or EV-DO communication system 400) are mixed, and the B network is an asynchronous mobile communication system 200. Alternatively, only the EV-DO communication system 400 exists.

First, when the mobile communication terminal 100 is connected to the base station A1 in the network A, the base station A1 transmits the base station (eg, A2 base station, etc.) information adjacent to the base station A1 to the mobile communication terminal 100, and then moves The communication terminal 100 performs a handover to the A2 base station located in the same network according to the movement of the user (movement in the A network). Subsequently, when the mobile communication terminal 100 receives the neighbor base station information transmitted from the base station A2, the mobile communication terminal 100 checks this and attempts to connect with the base station B1, which is the base station having the largest signal strength.

Second, when the mobile communication terminal 100 is performing data communication with the base station B1 in the B network, the mobile communication terminal 100 receives neighbor base station information transmitted from the base station B1, and then moves the user (B). Attempt to connect to the base station (eg, A2 base station) with the largest signal strength according to network-> network A.

Here, the asynchronous mobile communication system 200, the WiBro communication system 300, and the EV-DO communication system 400 each store not only base station information in the same network but also base station information in an adjacent network, and thus, the mobile communication terminal 100. Provides base station information including neighbor base station information.

4 is a flowchart illustrating an embodiment of a handover method according to the present invention, wherein the mobile communication terminal 100 is a network (asynchronous or EV-) from a network in which a WiBro network and an asynchronous network or an EV-DO network are mixed. A handover to a network in which only a DO network exists) will be described as an example. In addition, it will be described with reference to Fig. 3 for explaining the handover method.

The mobile communication terminal 100 illustrated in FIG. 4 is a multi-mode mobile communication terminal, and may selectively connect with the asynchronous mobile communication system 200, the WiBro communication system 300, and the EV-DO communication system 400. have.

When the mobile communication terminal 100 is connected to the WiBro communication system 300 (S101), the WiBro communication system 300 performs a base station communicating with the mobile communication terminal 100 (for example, the base station A1 of FIG. 3). And base station (for example, A2 base station) information adjacent to the mobile communication terminal 100 (S103).

Subsequently, when the signal strength of the connected base station (for example, the A1 base station) is weakened according to the movement of the mobile communication terminal 100, the first modem unit 126 of the mobile communication terminal 100 receives the WiBro communication system 300. Check the neighbor base station information transmitted from the), search for the signal of the neighboring base station, and transmits the access request signal to the neighboring base station (for example, A2 base station) to perform a handover (S105, S107).

The WiBro communication system 300 transmits adjacent base station information adjacent to a base station (for example, A2 base station) on which the mobile communication terminal 100 performs a handover to the mobile communication terminal 100 (S109).

Subsequently, when the signal strength of the connected base station (for example, the A2 base station) decreases as the mobile communication terminal 100 moves, the first modem unit 126 of the mobile communication terminal 100 receives the WiBro communication system 300. The neighbor base station information transmitted from the &lt; RTI ID = 0.0 &gt;) &lt; / RTI &gt;

The first modem unit 126 checks the neighbor base station information included in the neighbor base station information to determine whether the base station with the largest signal strength is located in the WiBro communication system 300 or another network (asynchronous mobile communication system 200 or EV). It is checked whether or not it is located in the network where only the DO communication system 400 exists (S113).

As a result of step S113, when the adjacent base station is not located in the WiBro communication system 300, the first modem unit 126 transmits the adjacent base station information received from the WiBro communication system 300 to the second modem unit 136. Attempt to communicate with the neighboring base station (S115).

Thereafter, the second modem unit 136 checks neighbor base station information transmitted from the first modem unit 126, searches for a signal of the neighboring base station, and transmits an access request signal to the found neighboring base station (S117, S119). ).

Herein, when the second modem unit 136 receives a response signal to the connection request signal transmitted from the asynchronous mobile communication system 200 or the EV-DO communication system 400, the second modem unit 136 is connected to the corresponding system to perform data communication. It performs (S121).

On the other hand, when the adjacent base station is located in the WiBro communication system 300 as a result of step S113, the first modem unit 126 transmits a connection request signal to the base station having the largest signal strength in the WiBro communication system 300 (S123). ).

Thereafter, when the first modem unit 126 receives a response signal to the access request signal transmitted from the corresponding base station in the WiBro communication system 300, the first modem unit 126 is connected to the corresponding system to perform data communication (S125).

The WiBro communication system 300 disclosed in FIG. 4 performs handover at the time of handover of the mobile communication terminal 100, and then transmits neighboring base station information to the mobile communication terminal 100 at initial connection with the system or at a predetermined time. send.

5 is a flowchart for explaining another embodiment of the handover method according to the present invention, in which the mobile communication terminal 100 is a WiBro network, an asynchronous network or an EV-DO network from a network in which only an asynchronous network or an EV-DO network exists. Performing handover to a mixed network will be described as an example.

The mobile communication terminal 100 illustrated in FIG. 5 is a multi-mode mobile communication terminal, and may selectively connect with the asynchronous mobile communication system 200, the WiBro communication system 300, and the EV-DO communication system 400. have.

The second modem unit 136 of the mobile communication terminal 100 receives neighbor base station information transmitted from the asynchronous mobile communication system 200 or the EV-DO communication system 400 (S201).

Subsequently, when the second modem unit 136 receives the neighbor base station information including the base station information of the other network transmitted from the asynchronous mobile communication system 200 or the EV-DO communication system 400, the second modem unit 126 receives this information. Attempt to communicate with the neighboring base station by transmitting to (S203).

Thereafter, the first modem unit 126 checks neighbor base station information transmitted from the second modem unit 136, searches for a signal of the neighboring base station, and transmits a connection request signal to the searched neighbor base station (S205, S207). ).

Herein, when the first modem unit 126 receives a response signal for the connection request signal transmitted from the WiBro communication system 300, the first modem unit 126 is connected to the corresponding system to perform data communication (S209).

The asynchronous mobile communication system 200 and the EV-DO communication system 400 disclosed in FIG. 5 perform handover at the time of handover of the mobile communication terminal 100, and then adjacent to each other at the time of initial connection with the system or at a predetermined time. The base station transmits the information to the mobile communication terminal 100.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical concept or essential characteristics. 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 using the neighbor base station information of the present invention and the mobile communication system therefor provide not only the base station information located in the same network but also the base station information located in the other network. There is an effect that the time required to perform the over can be shortened.

In addition, the present invention has the effect of reducing the power consumption unnecessarily while searching for the signal of the unspecified neighboring base station located in the other network to perform the handover to the other network.

Claims (6)

Communication with a mobile communication terminal including a first 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 at least one mobile communication system except for the WiBro communication system. A mobile communication system for performing handover between communication systems, The WiBro communication system stores neighbor base station information located in the at least one mobile communication system, and a mobile communication terminal located in the WiBro communication system is a boundary area between the WiBro communication system and the at least one mobile communication system. In case of moving to, the neighboring base station information is provided to the mobile communication terminal. Each of the at least one mobile communication system stores neighbor base station information located in the WiBro communication system, and wherein the mobile communication terminal located in the at least one mobile communication system is moved with the at least one mobile communication system. When the mobile station moves to the boundary area of the communication system, the mobile communication system is characterized by providing neighbor base station information to the mobile communication terminal. The method of claim 1, The neighbor base station information is at least one neighbor base station information adjacent to the base station with which the mobile communication terminal is performing communication, characterized in that it comprises PN code and frequency information of each of the neighbor base stations. The method of claim 1, At least one mobile communication system except for the WiBro communication system and the WiBro communication system may be any one of an initial connection with the mobile communication terminal, a predetermined period, or a time after the mobile communication terminal performs a handover. A mobile communication system characterized by transmitting neighbor base station information to the mobile communication terminal. Communication with a mobile communication terminal including a first 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 at least one mobile communication system except for the WiBro communication system. A method for supporting handover between communication systems, A first step of transmitting neighbor base station information to the mobile communication terminal; A second step of determining whether a neighbor base station included in the neighbor base station information is a corresponding mobile communication system in which the mobile communication terminal is located or another mobile communication system; And As a result of the determination of the second step, when the neighboring base station is a base station located in the same mobile communication system, handover to the corresponding base station is performed. A third step of searching for a signal of a base station located in another mobile communication system and communicating with the base station when the adjacent base station is a base station located in another mobile communication system as a result of the determination of the second step; Handover method comprising a. The method of claim 4, wherein The neighbor base station information is at least one neighbor base station information adjacent to the base station with which the mobile communication terminal is performing communication, characterized in that it comprises PN code and frequency information of each of the neighbor base stations. The method of claim 4, wherein At least one mobile communication system except for the WiBro communication system and the WiBro communication system may include an initial connection time with the mobile communication terminal, a preset period, a time when the mobile communication terminal performs a handover, or the mobile communication terminal Handover method, characterized in that for transmitting the neighbor base station information to the mobile communication terminal at any time after the handover.

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