KR101553297B1 - Method and apparatus for supporting local breakout service at wireless communication network comprising femto cell - Google Patents

Method and apparatus for supporting local breakout service at wireless communication network comprising femto cell Download PDF

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KR101553297B1
KR101553297B1 KR1020090028736A KR20090028736A KR101553297B1 KR 101553297 B1 KR101553297 B1 KR 101553297B1 KR 1020090028736 A KR1020090028736 A KR 1020090028736A KR 20090028736 A KR20090028736 A KR 20090028736A KR 101553297 B1 KR101553297 B1 KR 101553297B1
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South Korea
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femto
base station
gateway
femtocell base
lbo
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KR1020090028736A
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Korean (ko)
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KR20100110417A (en
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임채권
배범식
배은희
최성호
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삼성전자주식회사
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Priority to PCT/KR2010/002043 priority patent/WO2010114334A2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/082—Mobility data transfer for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a method and apparatus for supporting an LBO service in a wireless communication network including a femtocell, in which a terminal transmits a PDN connection request message for forming an LBO bearer with a femto PDN gateway connected to a core network and a heterogeneous LBO network, Transmitting the PDN connection request message to a femto serving gateway located in the same LBO femtocell base station gateway as the femtocell base station gateway, transmitting the PDN connection request message to a management entity, Receiving an PDN connection request message from an entity, acquiring an address of the femto PDN gateway located in the same LBO femtocell base station as the femto cell base station, receiving the uplink information for the femto PDN gateway And transmitting to the femtocell base station via the mobility management entity to form an LBO uplink bearer, and transmitting the femto serving gateway to the femto serving gateway through the femtocell base station via the mobility management entity, And transmitting the downlink information to the femto PDN gateway to form an LBO downlink bearer of the femto cell base station and the femto PDN gateway.

LBO, LBO femtocell base station, LBO femtocell base station gateway

Description

Technical Field [0001] The present invention relates to a method and apparatus for supporting an LBO service in a wireless communication network including a femtocell,

The present invention relates to a method and apparatus for supporting a local breakout service in a wireless communication network including a femtocell. More particularly, the present invention relates to a method and apparatus for supporting a local breakout service that transmits data directly to a data network without passing through a core network when the terminal is connected to a femtocell base station.

A femtocell is a micro mobile communication base station that connects to a mobile communication core network through a broadband network installed in a home or an office. The femtocell has various advantages such as expanding indoor coverage, improving call quality, and efficiently providing various wired / wireless convergence services.

In 3GPP LTE (Long Term Evolution), an evolved NodeB (eNB) and a home evolved NodeB (HeNB) have been defined. The eNB is a macro base station that manages a macro cell and the home eNB is a femto cell that controls a femtocell.

That is, 3GPP considers an environment in which a femtocell can be connected only to a specific user separately from a conventional macro base station. At this time, the femtocell can be installed by the user or the operator for the purpose of increasing the coverage, increasing the capacity, or providing other differentiated services. The service coverage of a femtocell can be considered from a minimum of several meters to a maximum macro service coverage.

However, although a femtocell can be directly connected to a data network in the past, a terminal connected to a femtocell can use a transmission path via a femtocell base station, a serving gateway, a PDN (Packet Data Network) There has been a problem in that it has to be connected to the Internet.

Accordingly, there is a need for a local breakout service in which a terminal connected to a femtocell transmits data directly to a data network without passing through a carrier network.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a structure of a wireless communication network for providing a local breakout service to a terminal connected to a femtocell and providing an efficient data transmission environment to the terminal, and a method therefor It has its purpose.

In order to solve the above problems, a local breakout (LBO) service supporting method of the present invention is a method for supporting a local breakout (LBO) service in a terminal connected to a femtocell base station, A second step of transmitting a PDN connection request message to the mobility management entity to form an LBO bearer with the femto PDN gateway connected to the core network and the heterogeneous LBO network, The mobility management entity receives the PDN connection request message and transmits the PDN connection request message to a femto serving gateway located in the same LBO femtocell base station gateway as the femtocell base station gateway;PDN gateway located in the same LBO femtocell base station as the femto cell base station after receiving the femto PDN gateway message, the femto-serving gateway obtains the uplink information for the femto PDN gateway, Transmitting the femto base station to the femtocell base station via the mobility management entity and forming an LBO uplink bearer by transmitting the femto base station to the femtocell base station via the mobility management entity; And transmitting the downlink information to the femto PDN gateway to form an LBO downlink bearer of the femto cell base station and the femto PDN gateway.

The LBO femtocell base station of the present invention is connected to the core network and the heterogeneous LBO network to transmit the uplink information to the femto serving gateway upon receiving a default bearer request message from the femto serving gateway, A femto PDN gateway for receiving downlink information transmitted from a femtocell base station via a mobility management entity and forming an LBO downlink bearer; And a femtocell base station receiving the uplink information transmitted from the femto PDN gateway through the mobility management entity to form an LBO uplink bearer and transmitting the downlink information to the femto PDN gateway through the mobility management entity .

The LBO femtocell base station gateway of the present invention obtains the address of the femtocell base station from the femtocell base station gateway that connects the femtocell base station and the mobility management entity and the femtocell base station gateway PDN gateway connected to the core network and the heterogeneous LBO network, obtains the uplink information for the femto PDN gateway, transfers the uplink information to the femto cell base station, and transmits the uplink information to the femto cell gateway And a femto-serving gateway for acquiring the information and delivering the information to the femto PDN gateway to form an LBO bearer.

According to the present invention, a terminal connected to a femtocell transmits data directly to a data network without passing through a core network, thereby providing an efficient data transmission environment to the terminal. Also, according to the present invention, it is possible to provide a local breakout service to a terminal without having to change a sex management entity that provided a conventional macro service.

The terminology of the embodiment of the present invention is basically based on the 3GPP LTE (Long Term Evolution) system standard, but is not necessarily interpreted to be limited thereto.

In the present invention, a cell or a base station can be used with the same meaning if there is no great confusion. Accordingly, the macro cell or the macro cell base station can be used in the same meaning, and the femto cell or the femtocell base station can be used in the same meaning.

Also, the Local Break Out (LBO) service described in the present invention refers to a service in which data of a terminal is directly transmitted to a data network (or LBO network) without passing through a core network.

The LBO network of the present invention refers to all networks different from the core network, and may be an Internet or a service network providing a home service.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of well-known functions and constructions that may obscure the gist of the present invention will be omitted.

First, the structure of a wireless communication network according to an embodiment of the present invention will be described. A wireless communication network according to an embodiment of the present invention is based on a cellular system, and a wireless communication network in which a macro cell base station and a femtocell base station coexist among the cellular systems will be described.

1 is a diagram illustrating a structure of a wireless communication network in which a macro cell base station and a femtocell base station coexist. The wireless communication network according to FIG. 1 includes a macro cell base station 110, a mobility management entity 120, a serving gateway 130, a PDN gateway 140, a femtocell base station 150, a femtocell base station gateway 160, (Not shown).

A macro cell base station (Macro eNB) 110 is a base station that supervises a macro cell. Here, the macrocell is a cell of a general cellular system, and the macrocell base station 110 is a base station that manages and controls the macrocell, but the same can be used for the sake of convenience in the present invention.

The macro cell base station 110 is connected to the terminal 170 through a wireless channel and controls radio resources. For example, the macro cell base station 110 can generate necessary system control information in the macro cell and broadcast it, or allocate radio resources for transmitting / receiving data or control information to / from the terminal 170 . In addition, the macro cell BS 110 may collect handover result information of the current cell and neighbor cells from the MS 170, and may instruct handover. The macro cell base station 110 for this purpose has a control protocol such as a radio resource protocol related to radio resource management.

The Mobility Management Entity ('MME') 120 manages a terminal in an idle mode, and selects a PDN (Packet Data Network) gateway and a serving gateway. In addition, the mobility management entity performs functions related to roaming and authentication. And the mobility management entity 120 processes the bearer signal generated at the terminal 170. [

The Serving Gateway 130 serves as a mobility anchor when performing handover between base stations or between 3GPP wireless networks.

The PDN gateway 140 allocates an IP address of the terminal 170, performs packet data related functions of the core network, and acts as a mobile anchor when moving between a 3GPP wireless network and a non-3GPP wireless network. . In addition, the PDN gateway determines a bearer band provided to a subscriber, and performs forwarding and routing of packet data.

The femtocell base station (Home eNB, HeNB) 150 is connected to a core network such as the mobility management entity 120 through a radio network controller to provide a mobile communication service to the terminal 170. Here, the femtocell is also referred to as a CSG cell (Closed Subscriber Group Cell), which refers to a cell that can only access terminals belonging to a specific group (i.e., CSG) that is registered in advance so that the cell can access the cell. Such a CSG cell may be a home cell typically installed in a small area such as a private home, or a corporate / regional network cell installed in a large area for an enterprise or a specific organization. The femtocell base station 150 according to the embodiment of the present invention provides a mobile communication service only to a terminal registered in itself, and includes identification information of a specific group, i.e., a CSG ID, .

The femtocell base station gateway (HeNB GW) 160 plays a role of connecting the mobility management entity 120 and the femtocell base station 150.

The terminal 170 may access the core network through the macro cell base station 110 or the femtocell base station 150.

The terminal 170 is connected to the macro cell base station 110 via the data transmission path 180 via the macro cell base station 110, the serving gateway 130 and the PDN gateway 140, Network).

On the other hand, when the terminal 170 is connected to the femtocell base station 150, the data transmission path 185 via the femtocell base station 150, the serving gateway 130, and the PDN gateway 140, (LBO network). However, in this case, although the direct connection from the femtocell base station 150 to the data network (LBO network) is possible (190), there is a problem that it must be bypassed using a data transmission path via the serving gateway 130 or the like . Accordingly, in the present invention, a local breakout service is provided to a terminal connected to the femtocell base station 150 to provide an efficient data transmission environment.

In the present invention, the femtocell base station 150 and the femtocell base station gateway 150, which provide the local break-out service to the terminal 170 connected to the femtocell base station without changing the mobility management entity 120 providing the conventional macro service, 160) and describe all the operations according to the structure. In the present invention, when there is no great confusion, the base station and the cell are used in parallel with each other.

2 is a diagram illustrating a structure of a femtocell base station and a femtocell base station gateway that enable an LBO service according to an embodiment of the present invention. Hereinafter, a femtocell base station providing an LBO service will be referred to as an LBO femtocell base station 210, and a femtocell base station gateway providing an LBO service will be referred to as an LBO femtocell base station gateway 240 according to an embodiment of the present invention. 2, the LBO femtocell base station 210 can be classified into a femto PDN gateway 220 (f-PGW) 220 and a femtocell base station 230 in function. In addition, the LBO femtocell base station gateway 240 may functionally be classified into a femtocell base station gateway 250 and a femto serving gateway (f-SGW) 260. Here, the femto PDN gateway 220 and the femto serving gateway 260 mean a serving gateway included in the PDN gateway or the femtocell base station gateway included in the femtocell.

2, the LBO femtocell base station is connected to the mobility management entity 120 through the LBO femtocell base station gateway 250. [ In addition, the femto cell base station gateway 250 and the femto serving gateway 260 are installed together in the LBO femtocell base station gateway 240 in terms of their functions so that mutual internal communication is possible.

In this case, the mobility management entity 120 and the PDN gateway 140 of the core network recognize the femto serving gateway 260 installed in the LBO femtocell base station gateway 240 as the other serving gateways 130 in the core network .

The present invention provides the LBO service without changing the mobility management entity 120 of the core network. To this end, in the embodiment of the present invention, the femto-serving gateway 260 sets the uplink and downlink information so that the femto cell base station 230 and the femto PDN gateway 220 can communicate directly.

More specifically, the femto-serving gateway 260 transmits the uplink information, which is originally set by the femto-serving gateway 260 to transmit data to the femto PDN gateway 220, through the mobility management entity 120, (230). A radio bearer capable of direct uplink communication is formed between the femtocell base station 230 and the femto PDN gateway 220.

The femto serving gateway 260 transmits downlink information that is originally set by the femto serving gateway 260 to transmit data to the femtocell base station 230 through the mobility management entity 120, And delivers it to the femto PDN gateway 220. Then, a radio bearer capable of direct downlink communication is formed between the femtocell base station 230 and the femto PDN gateways 220.

Hereinafter, a method of providing an LBO service according to an embodiment of the present invention will be described.

3 is a flowchart illustrating a process in which a terminal 170 requests an LBO service through an LBO femtocell base station 210 and receives an LBO service.

Referring to FIG. 3, the terminal 170 establishes an RRC connection with the femtocell base station 230 in step S307. In step S308, the terminal 170 transmits an initial UE message to the mobility management entity 120 via the femtocell base station 230. [ At this time, the femtocell base station gateway 250 transmits the message between the femtocell base station 230 and the mobility management entity 120, and transmits the temporary identity information of the terminal 170, i.e., the SAE Temporary Mobile Subscriber Identity (S-TMSI) (For example, the IP address of the femtocell base station) of the base station 230. Then, the mobility management entity 120 activates all the bearers used by the terminal 170 in step S309.

Then, in step S310, the terminal 170 transmits a PDN Connectivity Request message to the mobility management entity 120 to activate the LBO service. In this case, the terminal 170 transmits its own S-TMSI or TMSI value to an Access Point Name (APN) value indicating a connection request network, and transmits the APN = LocalPDN.S-TMSI '.

In step S310-1, the mobility management entity 120 obtains the IP address of the femto PDN gateway 220 using a DNS query in conjunction with a DNS (Domain Name Server). In this case, the DNS server is 'LocalPDN.xxx.' X.x.x.x 'or an arbitrary address' x.x.x.x 'to the mobility management entity 120 in response to the APN in the form of' x.x.x.x. In step S311, the mobility management entity 120 transmits an IP address, an APN, and a bearer ID to be newly created to the femto-serving gateway 260 through the Create Default Bearer Request, .

Here, the IP address of the femto PDN gateway that the mobility management entity 120 delivers to the femto serving gateway 260 may have a dummy value. This is because the mobility management entity 120 can not know the IP addresses of all PDN gateways and all femto PDN gateways. Accordingly, the femto-serving gateway 260 needs to perform another procedure for obtaining the IP address of the femto PDN gateway 220. [

The femto-serving gateway 260 receives the PDN connection request message from the mobility management entity 120 and transmits the PDN connection request message to the femtocell base station 230 associated with the S-TMSI through the internal signaling in step S312A. ), And obtains the IP address in step S312B. In this case, since the femtocell base station gateway 250 has already acquired the IP address of the femtocell base station 230 in step S308, it is possible to notify the femtocell base station gateway 260 immediately. In the embodiment of the present invention, it is assumed that the femto cell base station 230 and the femto PDN gateway 220 are installed in the same LBO femto cell base station 210. Therefore, the IP of the femto cell base station 230 acquired in step S312B The address may be assumed to be the address of the femto PDN gateway 220.

If the DNS can obtain the IP address of the femto PDN gateway 220 of the LBO femtocell base station 210 in step S310-1, steps S312A and S312B may not be performed.

The femto-serving gateway 260 that has acquired the IP address of the femto PDN gateway 220 can directly signal the femto PDN gateway using the obtained IP address. The femto-serving gateway 260 uses the IP address of the acquired femto PDN gateway 220 and transmits the uplink and downlink signals to the femto PDN gateway 220 and the femtocell base station 230, Set link information.

Accordingly, in step S313, the femto-serving gateway 260 transmits an APN to the femto PDN gateway 220 through a default bearer request message using the obtained IP address of the femto PDN gateway, Bearer ID, and downlink information allocated by the femto-serving gateway 260 for data transmitted from the PDN gateway 140 to the femto-serving gateway 260. In this case, the downlink information may include a downlink IP address and a GPRS Tunnel Protocol Tunnel End-Point ID (GTP TEID).

In step S314, the femto PDN gateway 220 transmits a Create Default Bearer Response message to the femto PDN gateway 220 for data transmitted from the femto-serving gateway 260 to the femto PDN gateway 220 And transmits the set uplink information to the femto serving gateway 260. The uplink information may include an uplink IP address and a GTP TEID.

Then, the femto-serving gateway 260 sets the uplink information set by the femto PDN gateway 220 as the uplink information of the femto-serving gateway 260. The femto-serving gateway 260 transmits the uplink information together with the generated bearer ID to the mobility management entity 120 in step S315. In step S316, the mobility management entity 120 transmits the generated bearer ID and the uplink information to the femtocell base station 230 through a bearer setup request message. Thereby, an LBO uplink bearer is formed between the femtocell base station 230 and the femto PDN gateway 220. Then, because the LBO uplink bearer is set up, the femto cell base station 230 can transmit the data received from the terminal 170 to the femto PDN gateway 220.

In step S317, the femto cell base station 230 sets up a radio bearer with the terminal 170. [ In step S318, the femto cell base station 230 transmits the bearer setup response message to the femto cell base station 230 for data transmitted from the femto serving gateway 260 to the femto cell base station 230 And transmits the set downlink information together with the bearer ID to the mobility management entity 120. Wherein the downlink information may include a downlink IP address and a GTP TEID.

The mobility management entity 120 forwards the bearer ID and downlink information to the femtocell base station 230 to the femto serving gateway 260 in step S319. In step S320, the femto-serving gateway 260 sets the received downlink information as the downlink information of the femtocerving gateway 260, and transmits an Update Bearer Request message to the femto To the PDN gateway 220. Due to this process, an LBO downlink bearer is formed between the femtocell base station 230 and the femto PDN gateway 220. The femto PDN gateway 220 can then transmit directly to the femtocell base station 230 upon receiving data to be transmitted to the terminal 170 in the data network due to the formation of the LBO downlink bearer.

The bearer information updated in steps S321 and S322 is transmitted to the femto serving gateway 260 and the mobility management entity 120. The terminal 170 transmits data to the LBO network through the femto PDN gateway 220 Can be performed directly.

3, the uplink information of the femto-serving gateway 260 is set as the uplink information for the femto PDN gateway 220 of the femtocell base station 230 and is transmitted to the femtocell base station 230 And step S320 of setting the downlink information of the femto-serving gateway 260 as the downlink information of the femto-cell BS 230 of the femto PDN gateway 260 and delivering the downlink information to the femto PDN gateway 22 do. Accordingly, the femto cell base station 230 of the present invention transmits the uplink data to the femto PDN gateway 230 and the femto PDN gateway 230 can directly transmit the downlink data to the femto cell base station 230.

According to another embodiment of the present invention, the femto PDN gateway uplink IP address in step S315 and the downlink IP address of the femto cell base station 230 in step S320 are not actually IP addresses but are different IPs defined beforehand for the LBO service Address may be used.

4A and 4B are flowcharts showing the operation of the femto-serving gateway 260 according to the embodiment of the present invention.

4A is a flowchart showing an operation after the femto-serving gateway 260 receives a Create Default Bearer Request message from the mobility management entity 120. FIG.

First, the femto-serving gateway 260 receives a Create Default Bearer Request message from the mobility management entity 120 in step S405. In step S410, the femto-serving gateway 260 determines whether the IP address of the femto PDN gateway 220 received from the mobility management entity 120 is registered in the femto-serving gateway 220 itself.

If the IP address of the femto PDN gateway 220 is not registered in the femto PDN gateway 220 itself, the femto serving gateway 260 determines whether the APN included in the default bearer request message is set to 'LocalPDN.S-TMSI' in step S415 . If the APN is set to 'LocalPDN.S-TMSI', the femto PDN gateway 220 proceeds to step S420 and determines whether the APN is 'LocalPDN.S-TMSI' Lt; / RTI > obtains the IP address of the client 230. In step S425, the femto-serving gateway 260 sets the IP address of the femto PDN gateway 220 to the acquired IP address of the femtocell base station 230. [ At the same time, the femto-serving gateway 260 establishes a bearer with the femto PDN gateway 220.

In this case, according to another embodiment of the present invention, the femto-serving gateway 260 may acquire the IP address of the femto PDN gateway 220 using the IP address of the femtocell base station 230 registered by the terminal 170 have.

In step S430, the femto-serving gateway 260 sets the uplink information for data transmission from the femtocell base station 230 to the femto-serving gateway 260 to the uplink IP address of the femto PDN gateway and the GTP TEID, To the entity (! 20).

In step S410, the address of the femto PDN gateway 220 is already registered in the femto serving gateway 260, or the value of the APN may not be in the form of 'LocalPDN.S-TMSI' in step S415. In this case, the femto-serving gateway 260 proceeds to step S435 and sets the bearer with the femto PDN gateway 220 using the IP address of the femto PDN gateway 220 delivered by the mobility management entity 120. In step S440, the femto-serving gateway 260 transmits the uplink information of the femto-serving gateway 260 to the mobility management entity.

4B is a flowchart showing an operation after the femto-serving gateway 260 receives an update bearer request from the mobility management entity 120. FIG.

First, the femto-serving gateway 260 receives an update bearer request message from the mobility management entity 120 in step S455. In step S460, the femto-serving gateway 260 determines whether the requested bearer is for the LBO service. If the requested bearer is for the LBO service, the femto serving gateway 260 proceeds to step S465 and the downlink information for the femto cell base station 230 is included in the received update bearer request message Or not. If the downlink information is included, the femto-serving gateway 260 proceeds to step S470 and sets the downlink information of the femto-serving gateway 260 to the downlink IP address of the femtocell base station 230 and the GTP TEID do. At the same time, the femto-serving gateway 260 performs the bearer update with the femto PDN gateway 220.

On the other hand, if it is determined in step S460 that the bearer that received the update request is not the bearer for the LBO service or the downlink information of the base station is not included in the update bearer request message, the femto serving gateway 260 proceeds to step S475, And performs bearer update with the femto PDN gateway 220 as requested.

FIG. 5 is a flowchart illustrating a process of transmitting data to a terminal in an idle mode in the LBO network when the data to be transmitted to the terminal is generated.

As shown in FIG. 5, when data to be transmitted to the terminal in the idle mode (Idle) occurs in the LBO network, it is received via the femto PDN gateway 220. In step S507, the femto PDN gateway 220 transmits a downlink data notification message to the femto-serving gateway 260 according to an embodiment of the present invention. The conventional downlink data notification is a message transmitted from the serving gateway to the mobility management entity. In the present invention, the femto PDN gateway 220 is configured to transmit the downlink data notification to the femto serving gateway 260.

Upon receiving the downlink notification message, the femto serving gateway 260 transmits the downlink notification message to the mobility management entity 120 in step S508. Then, the mobility management entity 120 performs paging for the terminal 170 in step S509, and the terminal 170 responds with a NAS service request message (NAS service request) in step S510.

In step S511, the mobility management entity 120 transmits the new bearer ID and the uplink information to the femto serving BS 260 received in step S315 of FIG. 3 through the initial context setup request message (INITIAL CONTEXT SETUP REQUEST) Information to the femtocell base station 230. The femtocell base station 230 then sets up a radio bearer with the terminal 170 in step S512. In step S513, the femto cell base station 230 transmits an initial context setup request message to the femto cell base station 230 for data transmitted from the femto serving gateway 260 to the femto cell base station 230 To the mobility management entity 120. The downlink information is transmitted to the mobility management entity 120. [ The initial context setup response message includes information such as a downlink IP address, a GTP TEID, and a bearer ID.

In step S514, the mobility management entity 120 transmits the bearer ID and the downlink information to the femtocell base station to the femto serving gateway 260 through the update bearer request message. Then, the femto-serving gateway 260 sets the downlink information to the femtocell base station 230 as its downlink information, and transmits the downlink information to the femto PDN gateway 220 together with the bearer ID.

Thereafter, the updated bearer information is transmitted to the femtocerving gateway 260 and the mobility management entity 120 through steps S516 and S517. The terminal 170 may then perform direct data communication with the LBO network via the femto PDN gateway 220. [

Meanwhile, according to another embodiment of the present invention, the femto PDN gateway 220 may directly transmit the data packet to the femto-serving gateway 260 instead of the downlink data notification message in step S507. In this case, step S508 is performed as a subsequent procedure for transmitting the data packet, and steps S509 through S517 may be performed in the same manner. The detailed procedure has already been described, so a detailed description will be omitted. In this case, the femto-serving gateway 260 may transmit the data packet received from the femto PDN gateway 220 to the femtocell base station 230 after step S514.

The embodiments of the present invention disclosed in the present specification and drawings are merely illustrative of specific embodiments of the present invention and are not intended to limit the scope of the present invention in order to facilitate understanding of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

1 shows a structure of a wireless communication network in which a macro cell base station and a femtocell base station coexist;

2 is a diagram illustrating a structure of a femtocell base station and a femtocell base station gateway that enable an LBO service of a femtocell base station according to an embodiment of the present invention;

3 is a flowchart illustrating a process in which a terminal 170 requests an LBO service through an LBO femtocell base station 210 and receives an LBO service.

4A is a flowchart showing an operation after the femto serving gateway 260 receives a Create Default Bearer Request from the mobility management entity 120. Fig.

4B is a flow chart showing operations after the femto serving gateway 260 receives an Update Bearer Request from the mobility management entity 120. FIG.

5 is a flowchart showing a process of transmitting data to be transmitted to a terminal in an idle mode in the LBO network, to the terminal 170 when data is generated.

Claims (10)

A method for supporting a local breakout (LBO) service in a wireless communication network including a femtocell, A first step of a terminal connected to a femtocell base station transmitting an initial terminal message for activating a radio bearer to a mobility management entity of a core network via a femtocell base station gateway; A second step of the PDP connection request message for forming a LBO bearer with the femto PDN gateway connected to the core network and the heterogeneous LBO network to the mobility management entity; A third step of the mobility management entity receiving the PDN connection request message and delivering the PDN connection request message to a femto serving gateway located in the same LBO femtocell base station gateway as the femtocell base station gateway; A fourth step of obtaining an address of the femto PDN gateway located in the same LBO femtocell base station as the femtocell base station after the femto serving gateway receives a PDN connection request message from the mobility management entity; A fifth step of the femto-serving gateway acquiring uplink information for the femto PDN gateway and transferring the uplink information to the femtocell base station via the mobility management entity to form an LBO uplink bearer; And The femto-serving gateway obtains downlink information on the femto-serving gateway transmitted from the femtocell base station via the mobility management entity, and transmits the downlink information to the femto PDN gateway, LBO < / RTI > downlink bearer. ≪ Desc / Clms Page number 13 > 2. The method according to claim 1, Wherein the femtocell base station gateway identifies an IP address of the femtocell base station. 3. The method according to claim 2, Wherein the femto-serving gateway receives an IP address of the femtocell base station from the femtocell base station gateway and obtains an address of the femto PDN gateway. 4. The method according to claim 3, Transmitting a default bearer request message to the femto PDN gateway using the address of the femto PDN gateway obtained by the femto-serving gateway; The femto PDN gateway having received the default bearer request message transmits the uplink information to the femto serving gateway; And Further comprising the step of the femto serving gateway transmitting the received uplink information to the femtocell base station through the mobility management entity. 5. The method of claim 4, The femtocell base station transmitting the downlink information to the femto serving gateway through the mobility management entity; And And transmitting the received downlink information to the femto PDN gateway by the femto serving gateway device. 4. The method of claim 3, And an uplink IP address and a GPRS Tunnel Protocol Tunnel End-point ID (GTP TEID). 4. The method of claim 3, A downlink IP address and a GTP TEID. The method according to claim 1, The femto PDN gateway transmitting a downlink data notification message to the mobility management entity via the femto serving gateway when data is transmitted from the LBO network to the terminal after entering the idle mode of the terminal; Further comprising: the mobility management entity paging the terminal and reconnecting the LBO bearer. 1. An LBO femtocell base station supporting a local breakout (LBO) service in a wireless communication network, Receiving a default bearer request message from a femto-serving gateway, and transmitting uplink information to the femto-serving gateway and receiving downlink information transmitted from the femtocell base station via the mobility management entity A femto PDN gateway forming an LBO downlink bearer; And And a femtocell base station receiving the uplink information transmitted from the femto PDN gateway through the mobility management entity to form an LBO uplink bearer and transmitting the downlink information to the femto PDN gateway through the mobility management entity Wherein the LBO femtocell base station comprises: 1. An LBO femtocell base station gateway supporting a local breakout (LBO) service in a wireless communication network, A femtocell base station gateway for identifying an address of a femtocell base station and connecting the femtocell base station and a mobility management entity; And Acquires the address of the femtocell base station from the femtocell base station gateway and obtains the address of the femto PDN gateway connected to the core network and the heterogeneous LBO network, acquires the uplink information for the femto PDN gateway, And a femto-serving gateway for obtaining downlink information on a femto-serving gateway of the femtocell base station and transmitting the downlink information to the femto PDN gateway to form an LBO bearer.
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