KR20110066744A - A method and apparatus for multi-radio access technology femtocell - Google Patents

Abstract

PURPOSE: An apparatus for selecting wireless access method in a femto base station is provided to improve power efficiency in an RAT(Radio Access Technology) femto base station. CONSTITUTION: A receiver(12) receives available RAT information of a terminal. A measuring device(13) measures channel state quality information of RAT included in the available RAT information of the terminal received from the receiver. A controller(14) selects a RAT which performs communication with the terminal using the channel quality information of the RAT. A transmitter(15) transmits the selected RAT to the terminal.

Description

A method and apparatus for selecting a wireless access method in a femto base station to which a multi-radio access technology is applied {A method and apparatus for multi-radio access technology femtocell}

The present invention relates to a method and apparatus for mitigating interference that may occur between a femtocell which is a micro base station and a neighbor base station.

A femto base station refers to a micro mobile base station that connects to a core network through a broadband band network installed in a building such as a home or an office. Inside the building, the coverage of the macro base station may be limited by the outer wall of the building.In such an environment, when the femto base station is installed indoors, the indoor coverage is expanded. Improve call quality In addition, it has the advantage of efficiently providing high-bandwidth wired and wireless convergence services. The femto base station is connected to a femtocell network controller (FNC) by wire through a broadband band network, and the femtocell control station is connected to a mobile communication core network.

Furthermore, the fixed mobile convergence (FMC) service method is an unlicensed mobile access (UMA) in which a user with a dual mode hand-set uses Bluetooth or Wi-Fi. It refers to a service method that allows the same service as GSM / GPRS to be used over an unlicensed radio frequency to move within the coverage of a wireless base station, and a FMC service method is currently being provided to a user by a service provider in each country. Currently, femto base stations communicate with terminals using a single wireless access method of cellular mobile communication standards such as 3GPP LTE or IEEE 802.16m, and recently, femto base stations are equipped with wireless LAN technology and wireless personal area network (WPAN). ), A technology for providing a service to a terminal through multiple radio access technologies (RATs) in one femto base station has been developed.

3GPP defines an unlicensed mobile access (UMA) that enables dual mode communication that can communicate with both macro and femto base stations. In addition, the dual-mode communication method and femtocell cellular mobile communication are combined with one femto base station to communicate via WPAN technology such as WLAN or Bluetooth through licensed band of cellular communication in a personal space such as home or office. Technology is being studied.

FIG. 1 illustrates a structure diagram of a network in which multiple radio access technology (RAT) base stations, single femto base stations, and WLAN APs are mixed.

1, within the coverage of the macro base station 110, the single femto base station 130, 140, the WLAN AP 150, 160, and the multiple radio access femto base station 170, 180, 190 provide different coverages. Exist. Each base station is connected to a femtocell control station 120.

Multiple radio access method femto base station (170, 180, 190) may have a variety of coverage according to the radio access methods that the femto base station has.

2 illustrates communication coverage of each radio access method in a multiple radio access femto base station.

As shown in FIG. 2, the coverages of the respective wireless access schemes are about 10 m or less for the WPAN 210, 30 m or less for the femto base station 220, and 50 m or less for the WLAN 230.

When multiple base stations are mixed in a specific region as shown in FIG. 1, interference may occur as the coverage of each of the multiple radio access femto base stations, the single radio access femto base station, and the WLAN AP overlap. have.

In the conventional femtocell interference mitigation method, when an interference occurs, a macro base station and a neighboring femto base station are designated to use a different frequency from that of the femto base station, or when the femto base station is located in an area where the femto base station is closely located, the connected terminal is used as a neighbor base station. There is a method of minimizing interference to neighboring base stations by operating in idle mode after handover.

However, the above methods are optimized for a case where a femto base station performing communication uses the same radio access technology (RAT) as neighboring base stations, and the femto base station uses multiple radio access methods. In case of a femto base station with multiple radio access methods that can communicate with each other, the method is not suitable, and the data transmission method, coverage, and data transmission timing of the radio access technology (RAT) used in the femto base station The interference mitigation method considering such is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to be specific when a femto base station performing communication is a multi-radio access femto base station using a plurality of radio access technologies (RATs). Provides a method and apparatus for performing communication with a terminal through a radio access method and deactivating other radio access methods to mitigate interference occurring in the terminal and to improve the efficiency of power usage of the multi-radio access femto base station and the terminal. It is.

In order to achieve the above object, the present invention is to effectively reduce the interference by effectively selecting the multi-radio access method of the multi-radio access femto base station when interference occurs in the terminal communicating with the multi-radio access femto base station; Provided are a method and an apparatus for reducing power consumption of a terminal.

The method includes receiving a list of available wireless access methods from a terminal, and using the available wireless access method list, a wireless connection having a better channel state quality than the wireless access method used by the terminal among the available wireless access methods. Searching whether there is a method, and if there is a wireless access method available through the search, converting the wireless access method being used for communication with the terminal to a wireless access method according to the search.

The apparatus includes a receiver for receiving available radio access information of the terminal from a terminal, a meter for measuring channel state quality information of the radio access method included in the available radio access information of the terminal received from the receiver, the A controller for selecting a radio access method for communicating with the terminal using channel state quality information of a radio access method, and a transmitter for transmitting the selected radio access method to the terminal. And a femto base station.

The apparatus includes an antenna for receiving and transmitting a signal to the multiple radio access femto base station, a receiver for receiving a signal from the antenna, and radio access information of a base station adjacent to the multiple radio access femto base station to which the terminal is connected. A measuring device for measuring a transmission rate, a transmitter for transmitting the measured information to the multi-radio access femto base station, and a communication method of the terminal to a wireless access method selected by the multi-radio access femto base station using the measured information. It includes a dual mode terminal, characterized in that it comprises a controller to.

The present invention performs communication with a terminal through a specific radio access method in performing communication in a multiple radio access femto base station using a plurality of radio access technology (RAT) and other radio access methods are deactivated. By doing so, there is an effect that can eliminate the interference phenomenon occurring in the terminal.

The present invention has the effect of improving the efficiency of the power usage of the connected terminal by using a specific radio access method in the multiple radio access femto base station.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. For the same procedures and components, in adding reference numerals to components in the procedural diagrams of the drawings, adding reference numerals to the components in the drawings, and adding reference numerals to the components in the drawings, the same procedures and components are used in different drawings. Note that the same sign is used even if it is indicated in.

In addition, many specific details are set forth in the following description, which is provided to help general understanding of the present invention, and the present invention may be practiced without these specific matters to those skilled in the art. Will be self-explanatory. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

FIG. 3 illustrates an interference by switching a radio access technology (RAT) in use when interference occurs between a multi-radio access technology (RAT) femto base station and a neighboring base station according to an embodiment of the present invention. It is to remove the.

The thick dashed lines in FIG. 3 indicate the coverage of the radio access method currently used in each base station.

3, a first terminal 330 communicating with a first multi-RAT femto base station 310 via a wireless local area network (WLAN) communicates with a second multi-RAT femto base station 320 via a WLAN. When interference occurs by the second terminal 340 that is performing, a femto cellular method or a wireless personal area network (WPAN) in which the coverage of the first multi-femto base station 310 and the first terminal 330 is narrower than that of a WLAN. In this way, the interference can be eliminated. Furthermore, in the case of FIG. 3, since only the first terminal 330 communicates with the first multi-RAT femto base station 310, it is more effective to perform communication using a WPAN method that consumes less power than a femto cellular method. .

FIG. 4 is a diagram illustrating a method for removing interference by switching a RAT in use when a terminal connected to a macro base station enters the coverage of a multiple radio access technology (RAT) femto base station and causes interference. .

The thick dashed lines in FIG. 4 indicate coverage of the radio access method currently used in each base station.

According to FIG. 4, the first terminal is communicating with the macro base station 410, but interference is caused by the second terminal communicating with the multiple radio access femto base station 420. In this case, interference may be eliminated through a method of connecting the first terminal 430 communicating with the macro base station 410 to the WLAN of the multiple radio access femto base station 420. On the other hand, when the second terminal 440 is located in the coverage of the WLAN and moves to the coverage of the WPAN is included in the coverage of the WPAN as well as the WLAN. Since the coverage of the WLAN includes the coverage of the WPAN, the second terminal 440 may communicate with the WLAN even after the movement, but it is more efficient to perform the communication in a WPAN method having a relatively low power consumption. In this case, communication is performed using the WPAN method.

Detailed radio access method conversion procedure and communication method selection criteria in a multi radio access technology (RAT) femto base station according to the present invention will be described in detail below.

5 illustrates a structural diagram of a dual mode terminal according to an embodiment of the present invention.

According to FIG. 5, the dual mode terminal changes the radio access method, the antenna 11, the receiver 12 receiving a signal from the antenna, the measuring device 13 measuring the state of the radio access method of the connected base station and the adjacent base station. Controller 14, and a transmitter 15 for transmitting the measured radio access information.

6 is a flowchart illustrating a procedure for changing a wireless access method in a dual mode terminal according to an embodiment of the present invention.

Referring to FIG. 6, when the terminal accesses the multiple radio access femto base station and performs communication, the terminal measures the usable radio access method of the multiple radio access femto base station using the measuring device 13 (S110).

The terminal transmits the information on the usable radio access method through the transmitter 15 to the multiple femto base station (S120), and the information on the radio access method changed from the multiple radio access femto base station connected by using the receiver 12. Received (S130).

The controller 14 in the terminal enables communication with multiple wireless femto base stations by changing the communication method based on the information on the radio access method capable of performing the communication (S140).

7 is a diagram illustrating a structure of a femto base station multiplex access method according to an embodiment of the present invention.

Referring to FIG. 7, a femto base station for a multi-radio access method includes a receiver 21 for receiving a signal from a dual mode terminal, a measuring instrument 22 for measuring radio access quality, a controller 23 for changing a radio access method, and dual signals. And a transmitter 24 for transmitting to the mode terminal.

8 illustrates a method of changing and selecting a radio access method in a multiple radio access femto base station according to an embodiment of the present invention.

Referring to FIG. 8, when a specific terminal accesses a multi-radio access femto base station, the receiver 21 in the multi-radio access femto base station provides radio access information that the terminal can use for the corresponding multi-radio access femto base station and the neighboring base station. Received from the terminal (S210).

In the multiple wireless access method femto base station measuring device 22 measures the channel state of the corresponding wireless access method from the available wireless access information of the terminal received from the received terminal (S220), the wireless access method used for communication with the terminal If the channel state quality is not good, the controller 23 switches to the wireless access method having good channel state quality (S230).

If switching is not possible, a radio access method (RAT_utilization_notification) message is transmitted to a femtocell network controller (FNC) or a mobility management entity (MME) through the transmitter 24 to control the radio access method of a neighboring base station. It is determined through the adjacent base station to deactivate the radio access method being used to prevent interference phenomenon (S240).

When it is possible to control the radio access method of the neighboring base station, the neighboring base station to deactivate the radio access method in use to prevent the interference phenomenon (S250), if it is impossible to use the previously used communication method as it is.

FIG. 9 illustrates a method for selecting a radio access method in a multiple radio access femto base station 20 when a radio access method connection conversion is possible in an adjacent base station according to an embodiment of the present invention.

In particular, the portion indicated by a dotted line in Figure 9 shows a radio access method change procedure according to the present invention.

The multi-radio access femto base station 20 communicates with the connected terminal 10 by using a plurality of available radio access methods, and the multi-radio access femto base station 20 may be connected to one terminal as needed. The communication may be performed using two wireless access methods simultaneously, or the communication may be performed using one wireless access method to one terminal. In such a situation, the performance degradation between radio access methods using the same frequency band may cause interference between adjacent small base stations using licensed band frequency or unlicensed band frequency, and femto base station. It may also be caused by interference occurring between macro base stations, or when one wireless access femto base station simultaneously uses radio access methods using the same unlicensed band frequency.

In general, the terminal 10 deactivates the radio access method for the radio access method that is not communicating with the base station. By deactivating a radio access method that is not communicating with the terminal 10, unnecessary power consumption can be prevented and performance degradation of an adjacent radio access method using the same frequency band can be prevented.

However, even if the radio access method is deactivated, the multi-radio access femto base station 20 uses the deactivated radio access method so that the UE can determine whether the radio access method exists and the channel state. Since the signal 10 is periodically transmitted, the terminal 10 can measure channel band information even for a wireless access method that is not connected.

Of course, in some cases, even if the wireless access method is not used to perform communication with the terminal, the newly entered terminal within the coverage of the multi-radio access femto base station 20 may reduce the time required for access to the base station. It can also be maintained.

According to FIG. 9, the terminal 10 connected to the multiple radio access femto base station 20 is i) periodically, ii) the radio access channel state of the multiple access femto base station 20 connected when interference occurs. Search for available wireless access method by measuring the (S305). At this time, the terminal 10 connected to the multiple radio access femto base station 20 measures not only the state of the channel band of the radio access method to which it is currently connected, but also the channel state of the radio access method that can be measured. The multi-radio access femto base station 20 can be transmitted.

After the measurement for the available radio access method, the terminal 10 transmits the available radio access information to the multiple radio access femto base station 20 (S310). The information transmitted to the multiple radio access femto base station 20 may be a list including a radio access ID and channel quality information (CQI).

Upon receiving the available radio access information, the multiple radio access femto base station 20 searches for the channel state quality of the available radio access method (S315).

As a result of the search, if there is a more efficient radio access method in addition to the radio access method that has previously performed communication with the terminal, the multiple radio access femto base station 20 activates a new radio access method (S320). .

However, until the terminal 10 changes the access method to the new wireless access method, it is also possible to selectively use the existing wireless access method in parallel with the new wireless access method, and transmit a specific signal to the terminal 10. The transmission method may transmit information indicating that the existing wireless connection method is deactivated and the new wireless connection method is activated at a specific time.

The multi-radio access femto base station 20 makes a change request (hereinafter, referred to as a "wireless access method change request message") for the activated radio access method for the terminal 10 (S325). The radio access method change information includes a previously used radio access method ID (old RAT ID) and the changed radio access method ID (new RAT ID).

Upon receiving the radio access method change request message, the terminal 10 changes the radio access method that is being used to communicate with the multiple radio access femto base station 20 according to the received radio access method change request message. S330).

When the radio access method is changed, the terminal 10 informs the multi radio access femto base station 20 that the radio access method has been changed (hereinafter, referred to as a "wireless access method change notification message") (RAT_change_response message) ) Is transmitted to the multi-radio access femto base station 20 (S335). The radio access method change notification message may include a radio access method ID (new RAT ID) currently used for access to inform the multi-radio access femto base station that the UE successfully changed the radio access method.

Upon receiving the radio access method change notification message from the terminal 10, the multiple radio access method femto base station 20 deactivates the previously used radio access method and performs communication using the changed radio access method (S340).

Hereinafter, a method of selecting a new radio access method by using a radio access method information received from a terminal by a multiple radio access method femto base station according to an embodiment of the present invention.

In step S315 of FIG. 9, the following method may be used to determine whether there is a more efficient wireless access method in addition to the conventional wireless access method.

There is a radio access method having a better channel quality than the radio access method currently taken by one or more terminals accessing the multiple radio access method femto base station 20 through available radio access method information collected from the terminal 10. Retrieve whether or not

If there is a wireless access method having a switchable channel state quality of a predetermined level or more, the existing access method of the terminal 10 is connected to a wireless access method having a channel state quality of a predetermined level or more, and the existing wireless access method is used. Deactivate.

If there are two or more wireless access methods with a certain level of channel state quality among the available wireless access methods, the location of the corresponding terminal 10 and the connection of the terminal 10 by each wireless access method are consumed. The radio access method may be determined by considering the amount of power and the channel state values of the available radio access methods.

For example, when the terminal is in close proximity to a multi-radio access femto base station, the coverage is small but the power consumption is connected using a WPAN method, and when the terminal is located outside the coverage of the WPAN power consumption is WPAN method Even more, the wireless access method may be determined to perform communication using a wide WLAN method.

However, when one terminal is located in the coverage area of the WPAN and the other terminal is in the coverage area of the WLAN, when both terminals use the WLAN access method, both terminals can communicate in one wireless access method.

However, if the power consumption of the terminal is considered as the top priority, even though the terminal located within the coverage of the WPAN can communicate using the WLAN method, the power consumption of the terminal is reduced by allowing the communication through the WPAN method with less power consumption than the WLAN. In this case, both wireless access methods are used.

If the focus is on minimizing the traffic, even if the terminal is located within the coverage of the WPAN, if the WLAN of the multi-radio access femto base station is already used to provide services to other terminals, multiple radio access methods may be used. In order to prevent power waste and traffic increase of the multi-radio access femto base station, which may occur by activation, the corresponding terminal may be selectively connected to the WLAN.

Next, a method of reducing interference by controlling a radio access method of a neighbor base station will be described.

In the case where each base station uses the same frequency or the same radio access method in a state where multiple base stations are located in an adjacent area, a multi-radio access method femto base station connected by the terminal 10 may occur because interference may occur by the adjacent base station. If the interference cannot be reduced by changing the radio access method at 20, the interference may be removed by removing the interference generated by the neighboring base station.

Therefore, i) there is no available radio access method, so it is impossible to change the connection to another radio access method, or ii) multiple radio access method performs communication only through the radio access method to which the terminal connected to the femto base station is currently connected. If the terminal is capable of transmitting a radio access method (RAT_utilization_notification) message to the femtocell network controller (FNC) or the mobility management entity (MME) 30 (S345).

The RAT_utilization_notification message indicates the base station ID of the corresponding multiple radio access femto base station, the channel quality value of available radio access methods, the existence of access terminal for each radio access method, and the current status information of each radio access method. The wireless access method usage notification (RAT_utilization_notification) message may be transmitted to the FNC or MME 30 periodically as well as when the corresponding terminal cannot switch to another access method, and the neighbor femto by the FNC or MME 30. Can be used for interference control between base stations.

Upon receiving the RAT_utilization_notification message from the multi-radio access femto base station 20, the FNC or MME 30 indicates that the base station using the same radio access method as the radio access method being used by the terminal is transmitted through the message. It is located in the vicinity to search whether or not the interference is generated (S350).

As a result of the search, when it is determined that the multi-radio access femto base station 20 is not using the radio access method being used by the neighboring base station, the FNC or the MME 30 may determine the neighboring base station to remove the interference occurring in the terminal. Consider handover.

If it is determined that handing over the terminal 10 to the neighboring base station 40 is more advantageous in reducing interference, handover is performed to the neighboring base station 40 and the handover is impossible or the handover helps to reduce the interference. If not, the communication is performed as it is (S355).

When handover is performed so that the terminal communicates with another base station, the terminal transmits information about the changed information to the terminal (S3650), and the terminal 10 receives the information to perform the communication according to the changed information. The communication method can be changed (S365).

Unlike the above, if the neighboring base station is using the radio access method being used by the terminal 10, the FNC or MME 30 transmits a radio access method change (RAT_utilization_change) message to the neighboring base station to the corresponding radio access Request to deactivate the method access method (S370).

The RAT_utilization_change message informs the neighboring base station of the type of radio access method to be deactivated. When the neighboring base station 40 that has received the deactivation request is a multi-radio access femto base station, available radio access at the base station is performed. The channel state quality of the scheme is searched, and it is determined whether or not it is possible to deactivate the radio access scheme which has received the deactivation request according to the search result (S375).

At this time, in checking whether the adjacent base station 40 can deactivate the corresponding radio access method and switching the radio access method of the connected terminal, the same method as the method of selecting the radio access method by the multiple radio access method described above. Follow the procedure (S315).

If it is determined that the switching to the multiple radio access femto base station to which the terminal is connected is impossible, the adjacent femto base station continues to request the deactivation through the RAT_utilization_notification message to the FNC or the MME 30 despite the request for deactivation for the radio access method. Notify that the wireless access method will be used (S380).

The FNC or MME 30 receiving the message notifies the multiple radio access femto base station that it is impossible to deactivate the radio access method being used by the neighbor base station 40 (S385).

Upon receiving the notification, the multiple radio access femto base station 20 handovers the terminal 10 to the neighboring base station 40 as described above, and then intercepts the interference occurring in the terminal 10 by operating in the idle mode. A method of minimizing may be considered (S355), and the following procedure follows the above-described step S360 to step S365.

On the contrary, if it is determined that the deactivation is possible, the neighboring base station 40 deactivates the radio access method being used by the base station to remove the interference occurring in the terminal 10 communicating with the multiple radio access femto base station 20 (S390). .

When the deactivation of the radio access method is completed, the neighboring base station 40 transmits the deactivation result of the radio access method to the FNC or the MME 30 through a radio access method use notification (RAT_utilization_notification) message (S395).

When the deactivation result is notified, the FNC or the MME transmits that the radio access method of the neighbor base station is deactivated to the multiple radio access femto base station 20 (S400), and the multiple radio access femto base station 20 uses the radio previously used. The communication is performed by the connection method.

Multi-radio access femto base station used in the present invention is a dual-mode terminal using a plurality of wireless access methods combined with WPAN technology such as mobile cellular wireless access, wireless LAN (WLAN), Bluetooth in one femto base station It is defined as a very small base station that can be used to communicate with a PC. As an example, a femto base station combining a cellular mobile communication service using a licensed band such as 3GPP, LTE, and IEEE802.16m and a UMA using an unlicensed band may be used. . Furthermore, the WPAN technology of the multiple radio access femto base station defined in the present invention may include WPAN technology such as UWB (ultra-wideband), mmWave, as well as the existing UMA Bluetooth method.

In the above description of the preferred embodiments of the present invention by way of example, the scope of the present invention is not limited only to these specific embodiments, the present invention is in various forms within the scope of the spirit and claims of the present invention May be modified, changed, or improved.

FIG. 1 illustrates a structure diagram of a network in which multiple radio access technology (RAT) base stations, single femto base stations, and WLAN APs are mixed.

2 illustrates communication coverage of each radio access method in a multiple radio access femto base station.

FIG. 3 is a diagram illustrating removing interference by switching a wireless access method in use when interference occurs between a multiple multi radio access technology (RAT) femto base station and a neighboring base station according to an embodiment of the present invention. .

FIG. 4 illustrates that a terminal connected to a macro base station enters the coverage of a multi-radio access technology (RAT) femto base station and removes interference by switching a wireless access method in use when interference occurs. It is.

5 illustrates a structural diagram of a dual mode terminal according to an embodiment of the present invention.

6 is a flowchart illustrating a procedure for changing a wireless access method in a dual mode terminal according to an embodiment of the present invention.

7 is a diagram illustrating a structure of a femto base station multiplex access method according to an embodiment of the present invention.

8 illustrates a method of changing and selecting a radio access method in a multiple radio access femto base station according to an embodiment of the present invention.

9 illustrates a method of selecting a radio access method in a femto base station in a multiple radio access method according to an embodiment of the present invention.

Claims (11)

In a communication method of a multiple wireless access femto base station, Receiving information on at least one available wireless access method from a terminal; Searching whether there is a radio access method having a better channel state quality than the radio access method currently used by the terminal among the available radio access methods by using the information on the available radio access methods; If there is a wireless access method available through the search, switching the wireless access method used for communication with the terminal to a wireless access method according to the search; Transmitting a radio access method change request message requesting the terminal to switch the radio access method in use to the radio access method according to the search; And And receiving a radio access method change notification message from the terminal and deactivating a previously used radio access method. The method of claim 1, The radio access method change request message and the radio access method change notification message includes an old radio access method ID or a new radio access ID. The method of claim 1, The step of switching the wireless access method in use, If there are two or more available wireless access methods, one of the location of the corresponding terminal, the amount of power consumed when the terminal is connected by each wireless access method, and one of the channel state values of each available wireless access methods. In consideration of the above, a method of selecting a radio access method, characterized in that the radio access method selection method in a multiple radio access femto base station. The method of claim 1, The step of searching whether there is a radio access method having a channel state quality superior to the radio access method used by the terminal, The femtocell network control to deactivate the radio access method used by the terminal when the searched available radio access method does not exist or the terminal can communicate only with the radio access method to which the terminal is currently connected. In a multi-radio access femto base station further comprising the step of transmitting a multi-radio access base station information that the terminal is connected to a femtocell network controller (FNC) or a mobility management entity (MME) How to choose a wireless connection method. The method of claim 1, The multi-radio access femto base station uses both an old radio access method and a new radio access method until the radio access mode change notification message is received from the terminal. How to choose. 4. The method according to any one of claims 1 to 3, The multi-radio access method includes a radio wireless access method, a wireless local area network (WLAN), a wireless personal area network (WPAN) of any one or more of the method characterized in that the radio access method selection in the femto base station Way. The method of claim 1, Receiving the information, And receiving the list periodically from the terminal or if interference occurs in the terminal. The method of claim 4, wherein When receiving a message from the neighboring base station that the radio access method used by the terminal cannot be deactivated, the neighboring base station communicates using a different frequency from the multiple radio access femto base station, or hands the terminal to a neighboring base station. Method for selecting a radio access method in a multi-radio access femto base station characterized in that the operation to the over and idle state to remove the interference generated in the terminal. The method of claim 8, If the terminal is not able to handover to the adjacent base station, the radio access method selection method in the multiple radio access method femto base station, characterized in that the existing radio access method is used as it is. In the multiple radio access communication device, A receiver for receiving available radio access method information of the terminal from a terminal; A measuring unit for measuring channel state quality information of the radio access method included in the available radio access method information of the terminal received from the receiver; A controller for selecting a radio access method for communicating with the terminal using channel state quality information of the radio access method; And And a transmitter for transmitting the selected radio access method to the terminal. In the multiple radio access communication device, An antenna for receiving and transmitting a signal to the multiple radio access femto base station; A receiver for receiving a signal from the antenna; A measuring unit for measuring radio access method information of the multiple radio access method femto base station to which the terminal is connected; A transmitter for transmitting the measured information to the multiple radio access femto base station; And And a controller for changing a communication method of the terminal to a wireless access method selected by the multi-radio access femto base station by using the measured information.

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