KR20120025102A - Apparatus and method for supporting local breakout service in wireless communication system - Google Patents

Abstract

PURPOSE: A Local BraekOut(LBO) service providing device in wireless communication system and a method thereof are provided to prevent load in a femto gateway in hand over between femto cell and macro cell. CONSTITUTION: When receiving a hand over request message, a macro gateway confirms whether a macro BS(Base Station) supports LBO service(207). A femto gateway transmits a hand over response message to a femto BS(211). The femto BS transmits a BS handover response message with an LBO service indicator to a terminal(213). The terminal generates handover indication message. The terminal transmits the handover indication message to a serving femto BS(215).

Description

Apparatus and method for providing Elvio service in wireless communication system {APPARATUS AND METHOD FOR SUPPORTING LOCAL BREAKOUT SERVICE IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a wireless communication system supporting a femto base station, and more particularly, to an apparatus and a method for preventing load from being concentrated on a femto gateway in a wireless communication system supporting a femto base station.

A femto cell refers to a small cell that covers a very small service range such as a home or an office in a cellular system, and a base station serving such a femto cell is called a femto base station. The femto base station is a low power operating base station that is connected to the mobile communication core network through a broadband network installed indoors, such as home or office. The femto base station has advantages of expanding indoor coverage, improving call quality, and efficiently providing various wired and wireless convergence services.

Meanwhile, in the 3rd Generation Partnership Project (3GPP) group, a femto base station supports a Home Nobe B (HNB) based on Wideband Code Division Multiple Access (WCDMA) and a Home evolved NodeB (Home eNB) based on Long Term Evolution (LTE). It is defined as. In addition, the Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard refers to a femto base station as a WiMAX access point and defines a network for a femto cell.

At present, traffic of all terminals in a femto cell is transmitted through a transmission path of a mobile communication provider network. That is, all Internet traffic generated from hundreds of thousands to millions of femto base stations is delivered to the Internet through the mobile carrier's femto gateway. To this end, the mobile operator should operate a large capacity femto gateway and core network that can handle all traffic generated from the femto base station. This is a factor that increases capex and operating costs of mobile operators.

Therefore, there is a need for a method for preventing load from being concentrated on a femto gateway in a wireless communication system supporting a femto base station.

An object of the present invention is to provide an apparatus and method for preventing load from being concentrated in a femto gateway in a wireless communication system supporting a femto base station.

Another object of the present invention is to provide an apparatus and method for providing an ElBo (Local BreakOut) service in a handover between a femto cell and a macro cell in a wireless communication system supporting a femto base station.

Another object of the present invention is to set whether or not the LBO service support in the terminal profile when the terminal subscribes to the service in a wireless communication system supporting the femto base station, based on this femto gateway and femto base station for generating the LBO service flow of the terminal An apparatus and method are provided.

Yet another object of the present invention is to provide a macro base station by removing service flow information for LBO from a handover acknowledgment message received from a femto gateway when a terminal moves from a femto cell to a macro cell in a wireless communication system supporting a femto base station. The present invention provides an apparatus and method for providing LBO service for transmission to a network.

Yet another object of the present invention is to provide a femto base station by including service flow information for LBO in a handover acknowledgment message received from a macro gateway by a femto gateway when a terminal moves from a macro cell to a femto cell in a wireless communication system supporting a femto base station. And a femto base station provides an LBO service providing apparatus and method for generating an LBO service flow of a terminal based on service flow information for an LBO.

According to a first aspect of the present invention for achieving the above object, in a wireless communication system, a method for providing an LBO service includes a handover acknowledgment message to a femto gateway in a situation in which a UE hands over from a macro cell to a femto cell. Transmitting, and including, by the femto gateway, service flow information for local breakout (LBO) of the terminal in the received handover confirmation message, wherein the service flow information for LBO supports an LBO service. Information on a service flow, wherein the femto gateway, characterized in that it comprises the step of transmitting a handover confirmation message containing the service flow information for the LBO of the terminal to the femto base station.

According to a second aspect of the present invention, a method for providing an LBO service in a wireless communication system includes: transmitting, by a femto gateway, a handover acknowledgment message to a macro gateway in a situation where a terminal is handed over from a femto cell to a macro cell; Removing, by the macro gateway, service flow information for local breakout (LBO) of the terminal from the received handover acknowledgment message, wherein the LBO service flow information is information about a service flow supporting an LBO service; And transmitting, by the macro gateway, to the macro base station a handover confirmation message from which the LBO service flow information of the terminal has been removed.

According to a third aspect of the present invention, a wireless communication system for providing an LBO service includes a macro gateway for transmitting a handover acknowledgment message to a femto gateway in a situation where a terminal handovers from a macro cell to a femto cell, and from the macro gateway. Receiving a handover confirmation message and including the service flow information for the local breakout (LBO) of the terminal in the received handover confirmation message and transmitting the femto gateway to the femto base station, wherein the service flow information for the LBO Is information on a service flow supporting an LBO service.

According to a fourth aspect of the present invention, a wireless communication system for providing an LBO service includes a femto gateway for transmitting a handover confirmation message to a macro gateway in a situation where a terminal handovers from a femto cell to a macro cell, and the handover confirmation. And a macro gateway that receives the message and removes service flow information for local breakout (LBO) of the terminal from the received handover confirmation message and transmits the information to the macro base station, wherein the service flow information for the LBO is an LBO service. Characterized in that the information on the service flow to support.

In the present invention, when a terminal moves from a femto cell to a macro cell in a wireless communication system supporting a femto base station, the macro gateway removes the service flow information for LBO from the handover confirmation message received from the femto gateway, and transmits it to the macro base station. When the UE moves from the macro cell to the femto cell, the femto gateway includes the service flow information for the LBO in the handover acknowledgment message received from the macro gateway and transmits the information to the femto base station, thereby providing LBO service during handover between the femto cell and the macro cell. It can be delivered successfully, which has the advantage of avoiding load concentration on the femto gateway. Furthermore, there is an advantage that the terminal connected to the femto base station can efficiently transmit data.

1 is a diagram illustrating a wireless communication system providing an LBO service during handover between a femto cell and a macro cell according to the present invention;
2 is a signal flow diagram illustrating a handover procedure for an LBO service when a terminal moves from a femto cell to a macro cell in a wireless communication system according to an embodiment of the present invention;
3 is a signal flow diagram illustrating a handover procedure for an LBO service when a terminal moves from a macro cell to a femto cell in a wireless communication system according to an embodiment of the present invention;
4 is a signal flow diagram illustrating a procedure for generating an LBO service flow after a UE hands over from a macro cell to a femto cell in a wireless communication system according to an embodiment of the present invention;
5 is a flowchart illustrating a method of operating a macro gateway for an LBO service when a terminal moves from a femto cell to a macro cell in a wireless communication system according to an embodiment of the present invention;
6 is a flowchart illustrating a method of operating a femto gateway for an LBO service when a terminal moves from a macro cell to a femto cell in a wireless communication system according to an exemplary embodiment of the present invention.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, a method for providing an LBO service in a wireless communication system will be described.

In the following description, the present invention will be described based on a femto cell, but is applicable to all small cells. Here, the small cell may include a micro cell, a pico cell, and the like.

In addition, in the following description, the present invention will be described as an example of a broadband wireless communication system conforming to the IEEE 802.16 standard, but it is of course applicable to all wireless communication systems supporting a femto cell.

1 is a diagram illustrating a wireless communication system providing an LBO service during handover between a femto cell and a macro cell according to the present invention.

Referring to FIG. 1, a macro base station (Macro BS) 107 is a base station covering a macro cell, and data of a mobile station (MS) 108 connected to the macro base station 107 itself. It is delivered to the core network, or receives data from the core network and delivers to the terminal 108 connected to the macro base station 107 itself. The macro base station 107 supports handover and mobility between terminals 108 in the macro cell. Here, the macro cell refers to a cell of a general cellular system, and one or more femto base stations (Femto BS) 102 may exist in one macro cell. According to the business model, the macro base station 107 may be classified into a base station capable of providing an LBO service and a base station unable to provide an LBO service.

The macro gateway (Macro-GW) 106 controls the macro base stations 107 and routes data between the core network and the macro base stations 107. Accordingly, the terminal 108 connected to the macro base station 107 may access the core network (or the Internet network) using the macro data traffic transmission path 112 of the macro base station 107 to the macro gateway 106. .

The femto base station 102 is an indoor base station used for an ultra small / low power home / office, and transmits data of a terminal 101 connected to the femto base station 102 to the core network or receives data from the core network. The femto base station 102 transmits to the terminal 101 connected to itself. The femto base station 102 supports handover and mobility between terminals 101 connected to the femto base station 102. In addition, the femto base station 102 installed indoors is connected to an ISP (Internet Service Provider) network through a cable or a digital subscriber line (DSL) before accessing the data network of the mobile communication provider.

The femto-gateway (Femto-GW) 103 controls the femto base stations 102 and routes data between the core network and the femto base stations 102. Accordingly, the terminal 101 connected to the femto base station 102 can access the core network (or the Internet network) using the femto data traffic transmission path 111 of the femto base station 102-femto gateway 103. .

The wireless communication system according to the present invention supports the LBO service during handover between the femto cell and the macro cell so that the load is not concentrated on the femto gateway 103. Here, the LBO service does not forward the data of the terminal 101 from the femto base station 102 to the data network of the mobile communication operator, that is, does not transmit the data to the femto gateway 103 through the router 105 of the ISP network. It refers to a service transmitted directly to the Internet network (ie, femto LBO traffic path 110).

According to the present invention, when the terminal 101 connected to the femto base station 102 moves from a femto cell capable of providing LBO service to a macro cell incapable of providing LBO service, the macro gateway 106 from the femto gateway 103. The service flow information for the LBO is removed from the received handover confirmation message and transmitted to the macro base station 107. Prior to this, the femto base station 102 informs the connected terminal 101 that it cannot continue to receive the LBO service in the macro cell to hand over.

In addition, when the terminal 108 connected to the macro base station 107 moves from the macro cell, which is unable to provide the LBO service, to the femto cell capable of providing the LBO service, the femto gateway 103 services the service in association with the AAA 104. The LBO service is supported by acquiring the flow information and transmitting the obtained LBO service flow information to the femto base station 102 in the handover confirmation message received from the macro gateway 106. In this case, the femto base station 102 generates the LBO service flow of the terminal 108 based on the service flow information for the LBO.

In the present invention, the femto gateway 103 and the macro gateway 106 have been described separately. However, if a femto cell-specific function can be implemented in the macro gateway 106, the macro gateway 106 may be configured as the femto gateway 103. It can also support features at the same time.

Although not shown, the femto base station 102 includes an SFM (Service Flow Management), an LBO_SFA (Service Flow Authorization) / LBO_DPF (Data Path Function), and a DHCP server. The LBO_SFA / LBO_DPF receives a request for generation of an LBO service flow from a femto gateway and provides service flow information for LBO to the SFM to generate an LBO service flow. In addition, the LBO_SFA / LBO_DPF performs a function required for local data path establishment and transmission. The SFM manages the creation, deletion, and change of a service flow (SF), and receives LBO service flow information from the LBO_SFA / LBO_DPF to determine whether to permit the LBO service flow generation request of the terminal. The DHCP server plays a role of allocating a local IP address for LBO of a terminal required for LBO service.

2 is a signal flowchart illustrating a handover procedure for an LBO service when a terminal moves from a femto cell to a macro cell in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, in step 201, the terminal 200 receives the LBO service from the femto base station 210, and performs a handover to the macro base station 240 according to the HO preparation procedure. Determine the over, and generates a mobile handover request (MOB_MSHO-REQ) message and transmits it to the femto base station (210). Here, the handover preparation procedure refers to a procedure for determining an optimal target base station based on signal strength and quality of service (QoS) parameters of the serving base station and neighbor base stations.

Thereafter, the femto base station 210 generates a handover request (HO_REQ: Handover_Request) message according to the reception of the terminal handover request message in step 203 and transmits it to the femto gateway 220.

In step 205, the femto gateway 220 receives the handover request message and transmits the handover request message to the macro gateway 230.

Thereafter, the macro gateway 230 checks whether the macro base station 240 supports the LBO service according to the reception of the handover request message in step 207, and indicates that the LBO service cannot be supported in step 209. A handover response (HO_RSP: Handover_Response) message including an LBO service indicator is generated and transmitted to the femto gateway 220. Here, the LBO service indicator is configured to include information on whether or not the LBO service support of the macro cell. In this case, the information about whether the LBO service is supported may be indicated by a code value. For example, if code = 0, the LBO service cannot be supported. If code = 1, the session is connected but is a general service flow instead of the LBO service. In this case, if code = 2, it may indicate that the LBO service can be supported.

In operation 211, the femto gateway 220 receives the handover response message and transmits the handover response message to the femto base station 210.

In step 213, the femto base station 210 generates a base station handover response (MOB_BSHO-RSP: Mobile_Base Station Handover-Response) message including the LBO service indicator according to the reception of the handover response message. 200). In this case, the terminal 200 receiving the base station handover response message may show the user a message indicating whether the LBO service is supported through a display window according to the code value of the LBO service indicator.

Thereafter, the terminal 200 generates a MOB HO_IND (Mobile Handover_Indication) message as a substantial handover initiation procedure for notifying the end of communication with the femto base station 210 serving as the serving base station in step 215. To transmit to the serving femto base station 210, thereby terminating the communication with the femto base station 210.

In step 217, the femto base station 210 receives a handover confirmation (HO_Cnf: Handover_Confirm) message for notifying the handover of the terminal 200 to the macro base station 240 which is a target base station according to the reception of the handover instruction message. It generates and transmits to the femto gateway 220. Here, the handover confirmation message is configured to include the LBO service flow information (LBO SF info .: LBO Service Flow information) of the terminal 200. In this case, the service flow information may include one or more service flow identifiers and information on whether each service flow supports LBO services, as shown in Table 1 below. Information on the flow (eg, LBO service flow identifier) will be referred to as 'service flow information for LBO'.

SF Info { Service flow information  SFID Service flow identifier  LBO_SUPPORTED LBO service support  ... }

Thereafter, the femto gateway 220 transmits the received handover confirmation message to the macro gateway 230 in step 219 according to the reception of the handover confirmation message.

If the macro base station 240 cannot provide the LBO service to the terminal 200 according to the business model, the macro gateway 230 then receives the received hand in step 221 according to the reception of the handover confirmation message. Checks whether the service flow information for LBO exists in the over confirm message.

If it is determined in step 221 that the LBO service flow information exists in the handover confirmation message, the macro gateway 230 proceeds to step 223 to remove the LBO service flow information from the received handover confirmation message. The handover confirmation message from which the service flow information for the LBO is removed is transmitted to the macro base station 240. According to another embodiment, the macro gateway 230 may map the service flow for the LBO to a general service flow. In this case, the macro gateway 230 should perform the procedure of performing step 207 of FIG. 2 and notifying the terminal 200 in advance through step 213.

On the other hand, although not shown, in step 221, if it is determined that the service flow information for LBO does not exist in the handover confirmation message, the macro gateway 230 remains the macro base station 211 as it is the received handover confirmation message. To send.

According to another embodiment of the present invention, step 221 may be performed by the femto gateway 220 instead of the macro gateway 230. That is, the femto gateway 220 checks whether the LBO service flow information is present in the handover confirmation message received from the femto base station 210, and removes the LBO service flow information from the handover confirmation message according to the presence. To the macro gateway 230. In this case, the macro gateway 230 may receive the handover acknowledgment message from which the service flow information for the LBO has been removed and transmit the same to the macro base station 240. In the case of the above embodiment, the femto gateway 220 has to perform the procedure of performing step 207 of FIG. 2 described above and notifying the terminal 200 whether the LBO service is supported through step 213.

According to another embodiment of the present invention, if it is determined in step 221 that the LBO service flow information exists in the handover confirmation message, the macro gateway 230 confirms the handover received from the femto gateway 220. The message may be transmitted to the macro base station 240 as it is, and instead, the LBO service flow of the terminal 200 may not be generated together with the macro base station 240.

3 is a signal flow diagram illustrating a handover procedure for an LBO service when a terminal moves from a macro cell to a femto cell in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 3, in step 301, while receiving a service from the macro base station 310, the terminal 300 determines a handover to the femto base station 340 according to the handover preparation procedure.

In step 303, the terminal 300 generates a serving macro (MOB HO_IND) message as a practical handover initiation procedure (Action) for informing that the communication with the macro base station 310, which is the serving base station, is terminated. Transmitting to the base station 310, thereby terminating the communication with the macro base station 310.

Then, the macro base station 310 generates a handover confirmation (HO_Cnf) message for notifying the handover of the terminal 300 to the femto base station 340 which is a target base station in step 305 in response to the reception of the handover indication message. To the macro gateway 320.

Thereafter, the macro gateway 320 transmits the handover confirmation message to the femto gateway 330 in step 307 according to the reception of the handover confirmation message.

Thereafter, the femto gateway 330 checks whether service flow information for LBO is included in the received handover confirmation message in step 309 and checks the received handover according to the reception of the handover confirmation message. If the LBO service flow information is not included in the message, after obtaining a terminal profile in association with AAA, the LBO service flow information of the terminal 300 is checked through the obtained terminal profile. Here, the terminal 300 sets the LBO service support for each service flow in the terminal profile when the service is subscribed, and the femto gateway 330 and the femto base station 340 generate the LBO service flow of the terminal 300. can do.

Thereafter, the femto gateway 330 includes the checked LBO service flow information in the received handover confirmation message in step 311 and transmits it to the femto base station 340, whereby the LBO service flow of the terminal 300. Request the creation of. Accordingly, the femto base station 340 may generate an LBO service flow of the terminal 300.

Although not shown, in step 309, if the service flow information for LBO is included in the received handover confirmation message, the femto gateway 330 transmits the received handover confirmation message to the femto base station 340 as it is. In doing so, it requests the generation of the LBO service flow of the terminal 300.

FIG. 4 is a signal flow diagram illustrating a procedure for generating an LBO service flow after a UE hands over from a macro cell to a femto cell in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 4, in step 401, the terminal 400 moves from a macro cell to a femto cell to complete a handover procedure. Here, the handover procedure is largely divided into a handover preparation procedure and an execution or action procedure. The handover execution procedure is further divided into a synchronization acquisition procedure, a network re-entry procedure, and a connection set-up procedure.

In the handover procedure of FIG. 3, the LBO_SFA / LBO_DPF 414 of the femto base station 410 receives a handover acknowledgment message requesting generation of an LBO service flow from a femto gateway, and in the received handover acknowledgment message. The LBO service flow is generated through step 403 based on the service flow information for the LBO.

That is, the LBO_SFA / LBO_DPF 414 may include a path registration request (Path_Reg_Req: Path_Registration_Request) message including service flow information for LBO of the terminal 400 in step 403 to generate an LBO service flow of the terminal 400. Generate and transmit to the SFM (412) of the femto base station (410).

Subsequently, when the SFM 412 receives the route registration request message, the SFM 412 permits the LBO service flow generation request of the terminal 400 based on the service flow information for the LBO in the route registration request message in step 405. If it is determined whether or not the permission is determined, a dynamic service add request (DSA-Request: Dynamic Service Add-Request) message including an LBO indicator is generated and transmitted to the terminal 400. Here, the LBO indicator is an indicator for requesting setting of a local IP for the LBO service, and may be defined as a separate parameter in the service flow information or by some field of a service flow identifier (SFID). Here, the SFM 412, when the available radio resource is greater than or equal to the amount of radio resources required for generating the LBO service flow of the terminal 400 with respect to the LBO service flow generation request of the terminal 400, Permit can be determined and, if small, denied.

Subsequently, the terminal 400 generates a Dynamic Service Add-Response (DSA-Response) message in step 407 according to the reception of the dynamic service add request message including the LBO indicator. To send.

Thereafter, the SFM 412 generates a path registration response (Path_Reg_Rsp: Path_Registration_Response) message in step 409 and transmits it to the LBO_SFA / LBO_DPF 414 according to the reception of the dynamic service addition response message.

Thereafter, the LBO_SFA / LBO_DPF 414 generates and transmits a path registration ACK (Path_Reg_ACK: Path_Registration_ACK) message to the SFM 412 in step 411 according to the reception of the path registration response message.

Thereafter, the SFM 412 generates a dynamic service add ACK (DSA ACK) message and transmits it to the terminal 400 in step 413 in response to receiving the route registration ACK message.

In step 415, the terminal 400 obtains a local IP address for the LBO by performing a DHCP procedure for setting a local IP for the LBO service with the DHCP server 416 of the femto base station 410. In this DHCP procedure, the terminal 400 generates a DHCP DISCOVER message and transmits it to the DHCP server 416, and the DHCP server 416 receiving the DHCP DISCOVER message generates a DHCP OFFER message to generate the DHCP DISER message. 400, the terminal 400 receiving the DHCP OFFER message transmits a DHCP request message to the DHCP server 416.

In step 417, the DHCP server 416 generates a message requesting to start LBO charging and transmits the message to the LBO_SFA / LBO_DPF 414.

Thereafter, the LBO_SFA / LBO_DPF 414 interoperates with the femto gateway 420 and exchanges information required for LBO charging in step 419.

Thereafter, the LBO_SFA / LBO_DPF 414 transmits and receives data with the terminal 400 through an LBO service flow using the obtained local IP address for the LBO in step 421.

5 is a flowchart illustrating a method of operating a macro gateway for an LBO service when a terminal moves from a femto cell to a macro cell in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the macro gateway checks whether a handover request message is received from the femto gateway in step 501.

When it is determined in step 501 that the handover request message is received, the macro gateway checks whether the LBO service can be supported in step 503.

If it is determined in step 503 that the LBO service can be supported, the macro gateway generates a handover response message including an LBO service indicator indicating that the LBO service is supported in step 505, and transmits it to the femto gateway. Proceed to step 509.

In contrast, when it is determined in step 503 that the LBO service is not supported, the macro gateway generates a handover response message including an LBO service indicator indicating that the LBO service cannot be supported and transmits the LBO service indicator to the femto gateway in step 507. After that, the flow proceeds to step 509.

In step 509, the macro gateway checks whether a handover confirmation message is received from the femto gateway.

In step 509, when it is determined that a handover confirmation message is received, the macro gateway checks whether service flow information for LBO of the UE exists in the received handover confirmation message in step 511.

If it is determined in step 511 that the LBO service flow information of the UE exists in the received handover confirmation message, the macro gateway removes the LBO service flow information from the received handover confirmation message in step 513. Then, the handover confirmation message from which the service flow information for the LBO is removed is transmitted to the macro base station.

On the other hand, when it is determined in step 511 that the LBO service flow information does not exist in the received handover confirmation message, the macro gateway sends the received handover confirmation message to the macro base station as it is in step 515. send.

The macro gateway then terminates the algorithm according to the present invention.

6 is a flowchart illustrating a method of operating a femto gateway for an LBO service when a terminal moves from a macro cell to a femto cell in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the femto gateway receives a handover confirmation message from the macro gateway in step 601.

In step 603, the femto gateway checks whether service flow information for LBO exists in the received handover confirmation message.

In step 603, when it is determined that there is no service flow information for LBO in the received handover confirmation message, the femto gateway acquires a terminal profile in cooperation with AAA in step 605, and obtains the obtained terminal profile. Check the service flow information for the LBO through the terminal.

In step 607, the femto gateway includes the checked LBO service flow information in the received handover confirmation message and transmits the information to the femto base station, thereby requesting generation of the LBO service flow of the terminal. Accordingly, the femto base station can generate the LBO service flow of the terminal.

On the other hand, when it is determined in step 603 that the LBO service flow information exists in the received handover confirmation message, the femto gateway transmits the received handover confirmation message to the femto base station as it is in step 609, This requests the creation of the LBO service flow of the terminal.

The femto gateway then terminates the algorithm according to the present invention.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Femto Base Station 102, Femto Gateway 103, Macro Gateway 106, Macro Base Station 107

Claims (24)

In a situation where the UE handovers from the macro cell to the femto cell, the macro gateway sends a handover confirmation message to the femto gateway,
The femto gateway including service flow information for local breakout (LBO) of the terminal in the received handover acknowledgment message, wherein the service flow information for LBO includes information on a service flow supporting an LBO service; ,
And transmitting, by the femto gateway, a handover confirmation message including service flow information for LBO of the terminal to a femto base station.
The method of claim 1,
Checking, by the femto gateway, whether there is service flow information for LBO in the received handover confirmation message;
If it is determined that the service flow information for LBO in the received handover confirmation message, the femto gateway further comprises the step of transmitting the received handover confirmation message to the femto base station as it is wireless How to provide LBO service in a communication system.
The method of claim 2,
When it is determined that there is no service flow information for LBO in the received handover confirmation message, the femto gateway acquires a profile of the terminal through interworking with AAA;
The femto gateway further comprises the step of checking the service flow information for the LBO of the terminal based on the obtained terminal profile.
The method of claim 3, wherein
The terminal further comprises the step of setting the LBO service support for each service flow in the terminal profile when the service subscription, LBO service providing method in a wireless communication system.
The method of claim 1,
The femto base station further comprises the step of generating the LBO service flow of the terminal based on the service flow information for the LBO of the terminal LBO service providing method in a wireless communication system.
The method of claim 5, wherein the LBO service flow generation process,
Transmitting, by the LBO_SFA / LBO_DPF of the femto base station, a path registration request (Path_Reg_Req: Path_Registration_Request) message including service flow information for LBO of the terminal to the SFM of the femto base station;
Determining, by the SFM of the femto base station, whether to permit the LBO service flow generation request of the terminal based on the service flow information for LBO in the path registration request message;
When the SFM of the femto base station determines the permission for the LBO service flow generation request of the terminal, the FFM transmits a Dynamic Service Add-Request (DSA-Request) message including an LBO indicator to the terminal. And wherein the LBO indicator is an indicator for requesting setting of a local IP for the LBO service.
The method of claim 5, wherein
Receiving, by the terminal, a local IP address for LBO from a DHCP server of the femto base station;
The terminal further comprises the step of transmitting and receiving data to and from the LBO_SFA / LBO_DPF through the LBO service flow using the assigned local IP address for LBO LBO service in a wireless communication system.
The method of claim 7, wherein
Transmitting, by the DHCP server of the femto base station, a message requesting to start LBO charging to the LBO_SFA / LBO_DPF;
The LBO_SFA / LBO_DPF, the LBO service providing method in the wireless communication system further comprising the step of exchanging information required for the LBO billing in conjunction with the femto gateway.
In a situation in which the UE handovers from the femto cell to the macro cell, the femto gateway transmits a handover confirmation message to the macro gateway;
Removing, by the macro gateway, service flow information for local breakout (LBO) of the terminal from the received handover confirmation message, wherein the service flow information for LBO is information about a service flow supporting an LBO service; ,
And transmitting, by the macro gateway, a handover acknowledgment message from which the LBO service flow information of the terminal has been removed to a macro base station.
The method of claim 9,
Checking, by the macro gateway, whether there is service flow information for LBO of the terminal in the received handover confirmation message;
If it is determined that the service flow information for the LBO of the terminal does not exist in the received handover confirmation message, the macro gateway further comprises the step of transmitting the received handover confirmation message to the macro base station as it is; LBO service providing method in a wireless communication system characterized in that.
The method of claim 9,
The terminal further comprises the step of setting the LBO service support for each service flow in the terminal profile when the service subscription, LBO service providing method in a wireless communication system.
The method of claim 9,
Before the handover confirmation message transmission process,
Transmitting, by the femto gateway, a handover request message to the macro gateway;
Checking, by the macro gateway, whether the LBO service is supported upon receipt of the handover request message;
When it is determined that the LBO service is supported, the macro gateway generates a handover response message including an LBO service indicator indicating that the LBO service is supported, and transmits the generated handover response message to the femto gateway;
If it is determined that the support of the LBO service is not possible, the macro gateway further includes generating a handover response message including an LBO service indicator indicating that the LBO service cannot be supported and transmitting the generated handover response message to the femto gateway. LBO service providing method in a wireless communication system.
A macro gateway that transmits a handover confirmation message to a femto gateway in a situation where the terminal handovers from the macro cell to the femto cell;
Receiving a handover confirmation message from the macro gateway, including the service flow information for the local breakout (LBO) of the terminal in the received handover confirmation message and transmits to the femto base station, wherein the LBO The service flow information for the wireless communication system for providing LBO services, characterized in that the information about the service flow supporting the LBO service.
The method of claim 13,
The femto gateway checks whether service flow information for LBO exists in the received handover confirmation message, and when it is determined that service flow information for LBO exists in the received handover confirmation message, the received Wireless communication system for providing a LBO service, characterized in that for transmitting the handover confirmation message to the femto base station.
The method of claim 14, wherein the femto gateway,
When it is determined that the service flow information for LBO does not exist in the received handover confirmation message, the UE obtains a profile of the terminal through interworking with AAA and based on the obtained terminal profile, the service flow for LBO of the terminal. Wireless communication system for providing an LBO service, characterized in that to confirm the information.
The method of claim 15,
And a terminal configured to set whether to support LBO service for each service flow in the terminal profile when the service is subscribed.
The method of claim 13,
And a femto base station generating an LBO service flow of the terminal based on the service flow information for the LBO of the terminal.
The method of claim 17, wherein the femto base station,
LBO_SFA / LBO_DPF for transmitting a path registration request (Path_Reg_Req: Path_Registration_Request) message including service flow information for LBO of the terminal to the SFM;
On the basis of the service flow information for LBO in the path registration request message, it is determined whether to permit the LBO service flow generation request of the terminal, and when the permission is determined, a dynamic service addition request including an LBO indicator (DSA-Request SFM for transmitting a Dynamic Service Add-Request (Message) message to the terminal, wherein the LBO indicator is an indicator for requesting setting of a local IP for the LBO service.
The method of claim 17,
The terminal further comprises receiving a local IP address for the LBO from the DHCP server of the femto base station, and transmitting and receiving data to and from the LBO_SFA / LBO_DPF of the femto base station through the LBO service flow using the assigned LBO local IP address. A wireless communication system for providing an LBO service.
The method of claim 19,
A DHCP server of the femto base station for transmitting a message requesting the initiation of LBO charging to the LBO_SFA / LBO_DPF of the femto base station;
In response to receiving the message requesting the LBO charging start, in conjunction with the femto gateway, further comprising the LBO_SFA / LBO_DPF of the femto base station for exchanging information necessary for the LBO charging wireless communication system for providing a LBO service .
A femto gateway for transmitting a handover acknowledgment message to the macro gateway in a situation where the terminal is handed over from the femto cell to the macro cell,
And a macro gateway that receives the handover confirmation message and removes service flow information for local breakout (LBO) of the terminal from the received handover confirmation message and transmits the information to the macro base station, wherein the service flow for the LBO. Information is a wireless communication system for providing an LBO service, characterized in that the information about the service flow supporting the LBO service.
The method of claim 21,
The macro gateway checks whether the LBO service flow information of the terminal exists in the received handover confirmation message, and the LBO service flow information of the terminal does not exist in the received handover confirmation message. When determined, the wireless communication system for providing an LBO service, characterized in that for transmitting the received handover confirmation message as it is to the macro base station.
The method of claim 21,
When the service is subscribed to a wireless communication system for providing LBO service, characterized in that it further comprises a terminal for setting the presence or absence of LBO service support for each service flow in the terminal profile.
The method of claim 21,
The femto gateway transmits a handover request message to the macro gateway before transmitting the handover confirmation message.
The macro gateway checks whether the LBO service can be supported according to the reception of the handover request message, and when it is determined that the LBO service can be supported, the macro gateway includes an LBO service indicator indicating that the LBO service can be supported. An over response message is generated and transmitted to the femto gateway, and when it is determined that the LBO service is not supported, a handover response message including an LBO service indicator indicating that the LBO service is not supported is generated and transmitted to the femto gateway. Wireless communication system for providing an LBO service, characterized in that.

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