KR101917831B1 - Method and apparatus for supporting local breakout service at serving gateway - Google Patents

Abstract

The present invention relates to a method and apparatus for supporting an LBO service in a serving gateway, and a method for supporting an LBO service in a serving gateway of a wireless communication network, the method comprising: receiving a local breakout (LBO) A destination terminal address extraction step of extracting a destination terminal address from a packet; And comparing the extracted destination terminal address with the LBO terminal address stored in the database to determine whether there is an identical address, and determining a PDN route or a LBO route as a route to transmit the packet received from the cell base station to the final destination terminal And a route determining step.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and an apparatus for supporting an LBO service in a serving gateway,

The present invention relates to a method and an apparatus for supporting a local breakout service in a wireless communication network, and more particularly, to a method and apparatus for supporting a local breakout service in a serving gateway in which a packet data transmitted to a specific destination terminal is directly transmitted to a destination terminal And apparatus.

The Internet communication we use today uses IP address based communication. Since all terminals connected to the Internet are assigned an IP address, between the two points communicating on the Internet, desired contents are exchanged through data pieces called IP packets containing the IP address of the destination and the IP address of the destination. Accordingly, the user terminal transmits the IP packet containing the IP address information of the receiver and the destination to the destination terminal through the Internet to perform wireless communication.

For example, when a user terminal accesses a mobile communication network and sends a data packet (IP packet) having an IP address to a destination terminal, the data packet is sequentially transmitted to the eNB, the S-GW, and the P-GW in the 4G mobile communication network, The P-GW can transmit the IP packet to the final destination terminal by transmitting the IP packet to the PDN (ex, Internet).

On the other hand, in most cases, terminal devices transmit or receive packet data to terminal devices connected to different networks via the Internet connecting internal corporate networks or public enterprise switched networks. In addition, due to the development of various mobile devices, Internet activity of individuals using Kakao Talk, SNS, etc. has also increased, and traffic load of P-GW and PDN is rapidly increasing recently. This increase in the traffic load of the P-GW and the PDN causes various problems in the wireless communication network such as the transmission rate delay and the like.

Korean Patent Laid-Open Publication No. 10-2016-0141113 "Industrial network system based on wired / wireless network and method of operating the same"

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

An object of the present invention is to provide a wireless communication transmission path in which a plurality of terminals interworked with a network constructed to transmit and receive packet data to each other without going through the Internet, And to provide a method and apparatus for supporting LBO service in a serving gateway capable of reducing traffic load.

It is an object of the present invention to provide a method and apparatus for supporting an LBO service in a serving gateway that provides a variety of packet transmission paths to reduce a traffic load of a P-GW and a PDN to solve a transmission rate delay problem of network communication.

The present invention is embodied by the following embodiments in order to achieve the above object.

A method for supporting a local breakout (LBO) service in a serving gateway of a wireless communication network according to one aspect, the method comprising: extracting a destination terminal address in a packet received from a cell base station; And comparing the extracted destination terminal address with the LBO terminal address stored in the database to determine whether there is an identical address, and determining a PDN route or a LBO route as a route to transmit the packet received from the cell base station to the final destination terminal And a route determination step.

The LBO terminal address is a destination terminal address previously specified among a plurality of destination terminals included in the LBO network and stored in the database.

The LBO service support method in the serving gateway may include: generating an LBO address for generating an LBO address by deleting the Outer IP header and the GTP header, modifying the SIP in the IP header, And an LBO route is further implemented.

In the LBO address generation and storing step, the SIP of the IP header is changed from the user terminal address to the serving gateway address and is modified.

The method of supporting an LBO service in the serving gateway may further include transmitting a packet received from the cell base station to a destination terminal through a LBO route to a destination terminal after the LBO address generation and storing step And an LBO route is implemented.

The LBO route is a packet movement path in which a packet transmitted from a user terminal is connected to a destination terminal through a cell base station and a serving gateway.

In accordance with another aspect there is provided an apparatus for supporting a local breakout (LBO) service in a serving gateway of a wireless communication network, the serving gateway comprising: a hash table management module for extracting a destination terminal address from a packet received from a cell base station; And a packet path for determining one of the PDN route and the LBO route as a route for transmitting the packet received from the cell base station to the final destination terminal by comparing the extracted destination terminal address with the LBO terminal address stored in the database, And a determination module.

The LBO terminal address is a destination terminal address previously specified among a plurality of destination terminals included in the LBO network and stored in the database.

When the packet-path determining module determines that the packet transmission path is an LBO route, the serving gateway deletes the Outer IP header and the GTP header of the packet, modifies the SIP of the IP header, and generates an LBO address An address generation module; And an LBO route is further implemented.

The LBO address generation module changes the SIP of the IP header from the user terminal address to the serving gateway address.

The LBO route is a packet movement path in which a packet transmitted from a user terminal is connected to a destination terminal through a cell base station and a serving gateway.

When the packet routing module determines that the packet transmission path is a PDN route, the serving gateway determines a packet header so that the packet is transmitted to the final destination terminal through the Internet according to the PDN route determination of the LBO route controller And a PDN route control unit for modifying the PDN route.

The present invention has the following effects with the above-described configuration.

The present invention provides a wireless communication transmission path in which a plurality of terminals interworked with each other and configured to transmit and receive packet data to and from each other without going through the Internet, Can be lowered.

The present invention can provide various packet transmission paths and reduce the traffic load of the P-GW and the PDN, thereby solving the transmission rate delay problem of the network communication.

1 is a diagram illustrating a structure of a wireless communication network including a PDN route and an LBO route according to an embodiment.
2 is a flowchart illustrating a step of moving a packet from a user terminal to a destination terminal through a PDN route according to an exemplary embodiment.
FIG. 3 is a flowchart illustrating the LTE network connection step of FIG. 2 in detail.
4 is a conceptual diagram illustrating the PDN root packet transmission step of FIG. 2 in terms of a packet header.
5 is a block diagram showing in detail a configuration of a serving gateway that provides a local breakout service according to another embodiment.
6 is a flowchart illustrating a step in which a packet is transmitted to a destination terminal under the control of a serving gateway according to another embodiment.
7 is a conceptual diagram illustrating the LBO root packet transmission step according to another embodiment in terms of a packet header.
8 is an exemplary diagram showing information stored in a hash table according to another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments.

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 addition, the local breakout (LBO) service described in the present invention is a service in which data of a user terminal is transmitted to a PDN gateway (P-GW) and a PDN (Packet Data Network, ex) But directly to the destination terminal.

The LBO network described in the present invention is defined as a network in which terminals such as a PC, a smart TV, a mobile phone, and a server can transmit and receive data, and can transmit and receive data without going through the external Internet. For example, an LBO network can be a disguised network within a company network, government agencies, and public organizations. In addition, the LBO network may include a network in which two or more networks are connected to each other by a corporation, a corporation, a corporation, and a governmental organization, so that data can be transmitted and received without going through the external Internet.

Hereinafter, a method and an apparatus for supporting the LBO service in the serving gateway of the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating a structure of a wireless communication network including a PDN route and an LBO route according to an embodiment.

1, the wireless communication network includes a user terminal 10, a cell base station (eNB) 20, a serving gateway (S-GW) 30, a PDN gateway (P- 50, a PDN route 60, and an LBO route 70. [

In addition, the mobile communication network can be composed of two parts: a radio access network (radio access network, E-UTRAN) and a core network (core network, EPC). The radio access network (E-UTRAN) may include a cell base station (eNB) 20 as a network to which the user terminal 10 accesses. The core network (EPC) is a network for delivering a packet sent from the user terminal 10 to the Internet, and includes a cell base station (eNB) 20, a serving gateway (S-GW) 30, a PDN gateway (P- (40) Others Although not shown in FIG. 1, it may include a mobility management entity (MME), a subscriber information management server (HSS), and the like.

The user terminal 10 may include not only a user equipment used for wireless communication but also a personal digital assistant (PDA) capable of wireless communication, a computer, and the like. The user terminal 10 may be fixed or mobile and may be referred to by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device,

 The cell base station (eNB) 20 establishes a radio physical channel necessary for exchanging data with the user terminal 10, and delivers data received from the user terminal 10 to an upper layer protocol. At the same time, data transmitted from the upper layer protocol is transmitted to the user terminal 10 according to the wireless environment. The cell base station 20 generally refers to a fixed station that communicates with the user terminal 10 and includes a node-B, a base transceiver system (BTS), an access point, And so on.

The serving gateway (S-GW) 30 acts as a mobility anchor when handing over between base stations or between 3GPP wireless networks.

The PDN gateway (P-GW) 40 allocates the IP address of the user terminal 10, performs the packet data related function of the core network, and acts as a mobile anchor when moving between the 3GPP wireless network and the non-3GPP wireless network . In addition, the PDN gateway 40 determines the bearer band provided to the subscriber, and performs forwarding and routing on the packet data.

The destination terminal 50 is a device that receives a data packet through the PDN route 60 or the LBO route 70 as a destination of data packets transmitted from the user terminal 10. [ According to one embodiment, the destination terminal 50 may be implemented as a user equipment, a user portable terminal, various servers, or the like, which are used for fixed or mobile wireless communication.

The destination terminal 50 that receives data packets through the PDN route 60 is a terminal device belonging to an external network capable of wireless communication with the network to which the user terminal 10 belongs and the Internet. The destination terminal 50 to which the data packet is transmitted is a terminal device belonging to a connection network in which data can be transmitted and received to and from the network to which the user terminal 10 belongs. Here, the network to which the destination terminal 50 that receives the data packet through the LBO route 70 belongs is the LBO network.

Referring to FIG. 1, the network to which the destination terminal 50 belongs can be implemented as an external network as well as a connection network. In this case, too, according to one embodiment, the serving gateway (S-GW) 30 controls the PDN gateway (P-GW) 40 (40) by controlling the data packet to be delivered to the destination terminal 50 via the LBO route 70 ) And PDN (Packet Data Network, ex, Internet) can be reduced.

The PDN route 60 is a route through which data packets transmitted from the user terminal 10 are transmitted to the destination terminal 50 via the Internet. More specifically, the PDN root 60 includes a user terminal 10, a cell base station (eNB) 20, a serving gateway (S-GW) 30, a PDN gateway (P- To the destination terminal 50 via the PDN.

The LBO route 70 transmits the data packet transmitted from the user terminal 10 to the destination terminal 50 (S-GW) 30 from the serving gateway (S-GW) 30 without going through the PDN gateway (P- ). ≪ / RTI > More specifically, the LBO route 70 includes a packet movement path that is connected to the destination terminal 50 through the user terminal 10, the cell base station (eNB) 20, and the serving gateway (S-GW) to be.

FIG. 2 is a flowchart illustrating a step of moving a packet through a PDN route from a user terminal to a destination terminal according to an exemplary embodiment. FIG. 3 is a flowchart illustrating in detail the LTE network connection step of FIG. A PDN root packet transmission step according to an example is explained from the viewpoint of a packet header.

Referring to FIG. 2, the packet movement step through the PDN route may include an LTE network connection step SlOO and a packet transmission step S200.

The LTE network connection step S100 is a case where the user terminal UE 10 subscribed to the LTE network / service is turned on and connected to the network for the first time, and the user terminal 10 accesses the MME (not shown) Attach Request message to the UE 10 and the MME is terminated by transmitting an Attach Accept message to the UE 10. At this time, the user terminal (UE) 10 transmits an Attach Request message to notify the UE 10 through the UE IP (eg, IMSI, etc.), and the MME informs the UE 10 (UE) 10 informs the TAI list 4 of the GUTI and the location update range as an ID to be used instead of the IMSI while transmitting an Attach Accept message.

In summary, in the LTE network connection step S100, the user equipment (UE) 10 starts the LTE network connection procedure starting from the connection request message, and when the connection procedure is completed, the PDN gateway ) 40 assigns an IP address (1.1.1.1.) To be used by the user terminal (UE) 10 and delivers the IP address to the MME. The MME transmits an Attach Accept including the IP address of the user terminal (UE) ) Message to the user terminal (UE) 10. That is, when the packet of the user terminal (UE) 10 goes to the Internet, the source IP (SIP) address included in the IP header is transmitted to the user terminal UE ) Is the IP address (1.1.1.1.) Of (10). This will be described in more detail below with reference to FIG.

The packet transmission step S200 is a step in which the data packet transmitted by the user terminal 10 is sequentially transmitted to the cell base station (eNB) 20, the serving gateway (S-GW) 30 and the PDN gateway (P- , And the PDN gateway (P-GW) 40 includes a step of transmitting the data packet to the Internet (PDN) and reaching the destination terminal 50. This will be described in detail below with reference to FIG.

Meanwhile, the packet movement step through the LBO route may include the LTE network connection step S100 and the packet transmission step S200. The difference from the packet movement step through the PDN route is that the S1 TEID information generated by the serving gateway (S-GW) 30 is mapped with the user terminal information in the LTE network connection step S100 and stored in the hash table. Further, there is another difference that the packet transmission path is different in the packet transmission step (S200).

In summary, in the LTE network connection step S100, S1 TEID information generated by the serving gateway (S-GW) 30 is mapped to the user terminal information and stored in the hash table, and the packet transmission step S200 The serving gateway (S-GW) 30 may determine the packet transmission path to be one of the PDN route or the LBO route. That is, according to the embodiment, the LTE network connection step (S100) and the packet transmission step (S200) can be implemented at the same time without regard to the PDN route or the LBO route. A more detailed description will be given later in Fig. 5 and Fig.

Referring to FIG. 3, the LTE network connection step S100 includes a user terminal ID acquisition step S110, a subscriber authentication step S120, a NAS security key establishment step S130, a location registration step S140, And a setting step S150.

Which of these procedures to take depends on the type of initial connection. The user terminal ID acquiring step S110 and the EPS session establishing step S150 are common to all the initial access types and the remaining procedures include the subscriber authentication step S120, the NAS security key setting step S130, Step S140 is optionally performed according to the initial connection type. The initial connection type is generally known, so a detailed description is omitted.

The user terminal ID obtaining step S110 is a step in which the MME obtains the IMSI of the user terminal (UE) 10. That is, the UE 10 transmits an Attach Request message including an IMSI to request a network connection, and the MME receives an Attach Request message to obtain an IMSI.

The subscriber authentication step S120 is a step in which the UE 10 authenticates the LTE network and the MME authenticates the UE 10 so that they can trust each other. The NAS security key establishment step S130 performs the NAS Security Setup procedure to securely transmit the NAS message (that is, the message between the MME and the UE) between the user terminal (UE) 10 and the MME. The location registration step S140 is a step in which the MME registers a user terminal (UE) 10 in the network and grasps which service the user terminal (UE) 10 can use.

In the EPS session setting step S150, the MME allocates the network / radio resources so that the MME can provide the service quality subscribed by the user by setting the EPS session and the default EPS bearer using the user subscription information.

The PDN gateway (P-GW) 40 allocates the uplink S5 TEID (S5 P-GW TEID) to the serving gateway (S-GW) 30 in order to generate S5 GTP in the EPS session setting step S150, The S5 GTP-U tunnel is generated and transmitted to the serving gateway (S-GW) 30 via the Create Session Response message, and the QoS profile to be applied to the S5 P-GW TEID and the default EPS bearer is transmitted to the serving gateway GW) 30 is able to transmit / receive upstream / downstream traffic from the PDN gateway (P-GW)

 The serving gateway (S-GW) 30 receives the Create Session Response message from the PDN gateway (P-GW) 40 and establishes an uplink S5 TEID (S5P-GW TEID) and allocates the uplink S1 TEID (S1 S-GW TEID) of the S1 GTP tunnel to be used for the S1 bearer. Adds the S1 S-GW TEID allocated by itself to the received Create Session Response message, and transmits a Create Session Response message to the MME, resulting in an S1 GTP-U tunnel upwards.

According to another embodiment, in the EPS session establishment step (S150), the serving gateway (S-GW) 30 stores the generated 'S1 TEID' in a hash table to be described below.

Here, 'S1 GTP tunnel' means between the cell base station (eNB) 20 and the serving gateway (S-GW) 30, 'S5 GTP tunnel' means between the serving gateway (S-GW) (P-GW) 40. The 'TEID (Tunnel ID)' is included in the GTP header described in FIG. 4 below. In addition, an interface between the cell base station (eNB) 20 and the serving gateway (S-GW) 30 is referred to as 'S1', a serving gateway (S-GW) 30 and a PDN gateway (P- Quot; S2 ".

For example, referring to FIG. 1, a plurality of user terminals 10a, 10b, ..., 10n are implemented in three and three user terminals 10a, 10b, 10c are connected to one serving gateway S- 30 and the PDN gateway (P-GW) 40, three GTP tunnels are created. In the LTE network, since the identification factor for distinguishing the GTP tunnels for each user terminal 10 is the TEID (tunnel ID) and the TEID distinguished for each user terminal 10 is used, the user terminal 10 can be distinguished through the TEID have.

4, the IP packet sent from the user terminal 10 is transmitted from the cell base station (eNB) 20 to the PDN gateway (P-GW) 40 through the GTP tunnel. That is, according to one embodiment, the transmission through the GTP tunnel is transmitted through the PDN route 60. This means that the user terminal 10 stores the destination IP address (Destination IP, DIP) in the header of the IP packet, The IP packet sent from the user terminal 10 is always transmitted from the cell base station (eNB) 20 to the PDN gateway (P-GW) 40 regardless of which value is recorded.

4 shows an uplink traffic flow after the user terminal 10 connects to the LTE network. More specifically, for example, when the user terminal 10 tries to access google, the source IP (SIP) of the IP header is connected to the PDN gateway (P-GW) in the LTE network connection step S100, (1.1.1.1.) Of the user terminal (UE) 10 allocated from the mobile terminal 40, and the Destination IP (DIP) is google. That is, the user terminal 10 transmits an IP packet having an IP header composed of the address of the user terminal (UE) 10 and the address of the destination terminal 50 to the cell base station (eNB) 20 .

Next, the cell base station (eNB) 20 adds 'Outer IP header', 'GTP header' and 'UDP header' to the IP packet received from the user terminal 10. Here, since the SIP in the Outer IP header is composed of the address of the cell base station (eNB) 20 and the DIP is the address of the serving gateway (S-GW) 30, the routing network performs routing based on the DIP of the Outer IP header And thus the IP packet is delivered to the serving gateway (S-GW)

Subsequently, the serving gateway (S-GW) 30 modifies the Outer IP header and the GTP header of the IP packet received from the cell base station (eNB) That is, since the SIP in the Outer IP header is modified to the address of the serving gateway S-GW and the DIP to the address of the PDN gateway (P-GW) 40, the IP packet is transmitted to the PDN gateway (P- .

The PDN gateway (P-GW) 40 then deletes the 'Outer IP header', the 'GTP header' and the 'UDP header' that were added for GTP tunneling. That is, the PDN gateway (P-GW) 40 restores the original IP packet sent from the user terminal 10, transmits the recovered IP packet to the Internet, and transmits the IP packet to the destination terminal 50 via the Internet do.

5 is a block diagram showing in detail a configuration of a serving gateway that provides a local breakout service according to another embodiment.

5, the serving gateway (S-GW) 30 receives an IP packet from the cell base station (eNB) 20 and determines a route to be transmitted to the final destination terminal 50, according to another embodiment. The transmission route may include a PDN route 60 or an LBO route 70. FIG. 4 illustrates an embodiment in which an IP packet is transmitted through the PDN route 60 in the packet header, and FIG. 7 illustrates an embodiment in which an IP packet is transmitted through the LBO route 70, .

The serving gateway (S-GW) 30 may map S1 TEID information generated in the LTE network connection step S100 to user terminal information and store the S1 TEID information in a hash table. According to the embodiment, the serving gateway (S-GW) 30 may store the user terminal information in the hash table with the S1 TEID information as a key.

Also, the serving gateway (S-GW) 30 extracts the address of the destination terminal 50 included in the IP packet in the packet transmission step S200, compares the extracted destination address with the LBO terminal address stored in the hash table And determines the route to which the IP packet is to be transmitted. Here, the LBO terminal address is defined as an address that is predefined by the user or the administrator among the addresses of the plurality of destination terminals 50 included in the LBO network and stored in the hash table. As described above, the user terminal 10 can be distinguished through the S1 TEID.

5, the serving gateway (S-GW) 30 may include an LBO route control unit 31, a PDN route control unit 32, and a database 33. [

The LBO root control unit 31 receives the IP packet from the cell base station (eNB) 20 and determines a route to be transmitted to the final destination terminal 50. The LBO route control unit 31 may include a hash table management module 311, a packet path determination module 312 and an LBO address generation module 313. [

 The hash table management module 311 can extract, modify, modify, delete, insert and manage information stored in the hash table. According to another embodiment, the hash table management module 311 may extract the S1 TE ID information generated in the LTE network connection step S100 and map the extracted S1 TE ID information to the user terminal information and store the S1 TE ID information in the hash table. Here, when the hash table management module 311 extracts the S1 TEID information from the packet, the DPI (Deep Packet Inspection) function can be used. In addition, the hash table management module 311 includes an embodiment in which user terminal information (value) is stored in a hash table with S1 TEID information as a key.

The hash table management module 311 may extract the address of the destination terminal 50 from the IP packet received from the cell base station (eNB) 20 and forward it to the packet path determination module 312 in the packet transmission step (S200) .

The packet path determination module 312 compares the destination terminal address received from the hash table management module 311 with the LBO terminal address stored in the hash table to determine whether there is an identical address, and transmits the IP packet received from the cell base station to the final destination And determines a route to be transmitted to the terminal 50.

If they match, the packet path determination module 312 determines the packet transmission path as the LBO route and delivers the result of address matching to the LBO address generation module 313. If there is an inconsistency, the packet path determination module 312 determines Path to the PDN root control unit 32 and may transmit an address mismatch result.

The LBO address generation module 313 deletes the 'Outer IP header' and the 'GTP header' that were added for GTP tunneling (GPT tunneling), and modifies the SIP of the IP header. More specifically, the LBO address generation module 313 generates an LBO address by modifying the SIP of the IP header from the address of the user terminal (UE) 10 to the address of the serving gateway (S-GW) 30 , And forward the IP packet to the LBO route to the destination terminal 50.

According to another embodiment, since the SIP in the IP header is stored at the address of the serving gateway (S-GW) 30, the corresponding IP packet can be transmitted to the LBO route (P-GW) 40 without passing through the PDN gateway And is transmitted / received between the serving gateway (S-GW) 30 and the destination terminal 50 via the Internet. Accordingly, the packet load of the PDN gateway (P-GW) 40 and the PDN (Internet) can be reduced.

The LBO address generation module 313 transfers the LBO address to the hash table management module 311. The hash table management module 311 uses the LBO address as a key and stores the S1 TEID information as a hash table Lt; / RTI > The specific method of generating the LBO address will be described below with reference to FIG. 7, and the information stored in the hash table will be described in detail with reference to FIG.

The PDN root control unit 32 may modify the packet header so that the packet is transmitted to the final destination terminal via the Internet according to the PDN route decision of the packet path determination module 312. [ In more detail, the PDN root control unit 32 modifies the Outer IP header and the GTP header of the IP packet received from the cell base station (eNB) Since the SIP in the Outer IP header is modified to the address of the serving gateway S-GW and the DIP to the address of the PDN gateway (P-GW) 40, the IP packet is delivered to the PDN gateway (P-GW) 40 .

According to the embodiment, when the LBO route control unit 31 and the PDN route control unit 32 modify the header address, the NAT (network address translation) function can be used.

In summary, when it is determined that the transmission route is the PDN route 60, the PDN route control unit 32 modifies the Outer IP header and the GTP header so that the IP packet is transmitted to the PDN gateway (P-GW) The LBO route control unit 31 modifies the IP header so that the IP packet is transmitted and received between the serving gateway (S-GW) 30 and the destination terminal 50, and when the Outer IP Header, GTP header, and UDP header. That is, the LBO root control unit 31 restores the SIP header of the IP header from the address of the user terminal (UE) 10 to the serving gateway (S-GW) 30, To the address of

The database 33 may store a hash table. In the hash table, the LBO terminal address, the S1 TEID information mapped to the LBO address, the S1 TEID information, and the mapped user terminal information may be stored. The hash table can be implemented in a data structure that has a hash function applied. In the present invention, the form in which the LBO terminal address, the S1 TEID information mapped with the LBO address, and the S1 TEID information and the mapped user terminal information are stored is not limited to the hash table, and may include various data storage forms.

6 is a flowchart illustrating a step in which a packet is transmitted to a destination terminal under the control of a serving gateway according to another embodiment.

Referring to FIG. 6, in a method of supporting a local breakout (LBO) service in a wireless communication network, a method of supporting an LBO service includes an S1 TEID extraction storing step S61, a destination terminal address extracting step S62, The packet transmission step S64 to the PDN, the LBO address generation and storage step S66, and the packet transmission step S67 to the destination terminal may be included in the packet transmission step S63, the P-GW packet transmission step S64,

In step S61, S1 TEID information generated by the serving gateway (S-GW) 30 in the LTE network connection step S100 may be mapped to the user terminal information and stored in the database 33, , The user terminal information (value) can be stored in the hash table with the S1 TEID information as a key.

The S-TEID information and the user terminal information are stored in the hash table and the LBO address and the S1 TE ID information are also stored in the hash table as shown in FIG. 8 to be described later. Thereafter, the serving gateway (S-GW) When receiving an IP packet from the terminal 50, the user terminal information can be acquired by referring to the hash table. Therefore, the serving gateway (S-GW) 30 can add the header information to the IP packet based on the acquired user terminal information, whereby the IP packet transmitted from the destination terminal 50 is transmitted to the cell base station (eNB) (Not shown).

In step S62, the serving gateway (S-GW) 30 can extract the destination terminal address from the packet received from the cell base station (eNB) 20. [ Meanwhile, the IP packet is packed in the GTP packet, and the header of the GTP packet is removed, and the address of the destination terminal 50 of the packet can be confirmed by checking the inside. Thus, according to one embodiment, the serving gateway (S-GW) 30 may extract the destination terminal address from the received packet using a deep packet inspection (DIP) technique.

In step S63, the serving gateway (S-GW) 30 compares the extracted destination terminal address with the LBO terminal address stored in the database 33 to determine whether or not there is an identical address, and from the cell base station (eNB) A route to transmit the received packet to the final destination terminal 50 can be determined.

Here, according to the embodiment, the LBO terminal address may be defined as a destination terminal address that is previously specified among a plurality of destination terminals included in the LBO network and stored in the database, and is recorded in the hash table and stored in the database 33 Lt; / RTI > In addition, the transport route may include the PDN route 60 or the LBO route 70.

 If it is determined that the address is matched (S63, Yes), the process proceeds to step S66 to generate and store the LBO address so that the packet is delivered to the LBO route 70. If it is determined that the address is inconsistent (No in S63) And proceeds to the packet transmission step S64 to the P-GW so that the packet is transmitted.

In step S64, the serving gateway (S-GW) 30 modifies the Outer IP header and the GTP header of the IP packet received from the cell base station (eNB) That is, since the SIP in the Outer IP header is modified to the address of the serving gateway S-GW and the DIP to the address of the PDN gateway (P-GW) 40, the IP packet is transmitted to the PDN gateway (P- .

In step S65, the PDN gateway (P-GW) 40 deletes the 'Outer IP header', 'GTP header' and 'UDP header' that were added for GTP tunneling. That is, the PDN gateway (P-GW) 40 restores the original IP packet sent from the user terminal 10 and transmits the recovered IP packet to the Internet (PDN), and the IP packet is transmitted to the destination terminal 50 ).

In step S66, the serving gateway (S-GW) 30 deletes the Outer IP header and the GTP header, modifies the SIP in the IP header, and generates an LBO address so that the packet can be delivered to the LBO route. In step S66, the serving gateway (S-GW) 30 includes an embodiment in which the SIP in the IP header is changed from the address of the user terminal 10 to the address of the serving gateway (S-GW) do.

In step S67, the serving gateway (S-GW) 30 can transmit the packet received from the cell base station (eNB) 20 to the final destination terminal 50 via the LBO route. The LBO route is a packet movement path in which a packet transmitted from the user terminal 10 is connected to the destination terminal 50 through the cell base station (eNB) 20 and the serving gateway (S-GW)

7 is a conceptual diagram illustrating the LBO root packet transmission step according to another embodiment in terms of a packet header.

Referring to FIG. 7, the uplink traffic flows after the user terminal 10 connects to the LTE network. 7, the header modification performed by the user terminal 10 and the cell base station (eNB) 20 with respect to insertion, addition, etc. of the IP header is performed by the user terminal 10 and the cell base station (eNB) 20 ) Is the same as the header modification that is performed.

7 is different from the case of FIG. 4 in the header modification method performed by the serving gateway (S-GW) 30 when it is determined that the LBO service is performed. The difference is that the serving gateway S-GW 30 does not match the LBO terminal address stored in the hash table with the address of the destination terminal 50 included in the IP packet in the packet transmission step S200, Lt; RTI ID = 0.0 > IP < / RTI >

In detail, the serving gateway (S-GW) 30 deletes the 'Outer IP header', the 'GTP header' and the 'UDP header' of the IP packet received from the cell base station (eNB) (SIP: UE 10) of the user terminal (UE) 10 to the address of the serving gateway (S-GW) 30 (SIP: S-GW 30).

The serving gateway (S-GW) 30 deletes the 'Outer IP header', the 'GTP header' and the 'UDP header' to recover the IP packet sent from the original user terminal 10, (S-GW) 30 of the gateway (S-GW) 30, so that the IP packet can be received from the destination terminal 50 to the serving gateway (S-GW) 30 .

FIG. 8 is an exemplary view showing information stored in a hash thread according to another embodiment.

 A hash table is a data structure by an algorithm that can calculate the address where a record is stored from a key and a key value so that the stored data (record) can be found through a hash function. In addition, the information stored in the database 33 to be described below is not limited to being stored in the form of a hash table, and may include various embodiments.

The hash table may store the LBO terminal address to be compared with the address of the destination terminal 50 extracted from the IP packet by the serving gateway (S-GW) 30 in the LTE network connection step S100. Referring to FIG. 8, the LBO terminal address is an address previously defined by a user or an administrator among the addresses of a plurality of destination terminals 50 included in the LBO network and stored in the hash table.

 Also, the hash table can store the user terminal information in the hash table with the S1 TEID information generated in the LTE network connection step S100 as a key by the serving gateway (S-GW) 30. Also, the hash table can store the S1 TEID information in the hash table with the serving gateway (S-GW) 30 as the key of the LBO address information generated in the LTE network access step S100.

Accordingly, the serving gateway (S-GW) 30 receiving the IP packet from the destination terminal 50 generates the LBO address based on the source port of the IP packet and compares the generated LBO address with the hash table If there is an LBO address in the hash table, it can acquire the S1 TEID information mapped with the LBO address and acquire the user terminal information from the hash table based on the acquired S1 TE ID.

The serving gateway (S-GW) 30 generates 'Outer IP header', 'GTP header' and 'UDP header' based on the obtained user terminal information and transmits the IP packet received from the destination terminal 50 And adds the generated headers. Here, since the SIP of the Outer IP header is composed of the address of the serving gateway (S-GW) 30 and the DIP of the cell base station (eNB) 20, the routing network performs routing based on the DIP of the Outer IP header And therefore, the IP packet is transmitted to the cell base station (eNB)

While the specification contains many features, such features should not be construed as limiting the scope of the invention or the scope of the claims. In addition, the features described in the individual embodiments herein may be combined and implemented in a single embodiment. Conversely, various features described in the singular < Desc / Clms Page number 5 > embodiments herein may be implemented in various embodiments individually or in combination as appropriate.

Although the operations have been described in a particular order in the figures, it should be understood that such operations are performed in a particular order as shown, or that all described operations are performed to obtain a sequence of sequential orders, or a desired result . In certain circumstances, multitasking and parallel processing may be advantageous. It should also be understood that the division of various system components in the above embodiments does not require such distinction in all embodiments. The above-described program components and systems can generally be implemented as a single software product or as a package in multiple software products.

The method of the present invention as described above can be implemented by a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto optical disk, etc.). Such a process can be easily carried out by those skilled in the art and will not be described in detail.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

10: user terminal 20: cell base station
30: Serving gateway 40: PDN gateway
50: Destination terminal 60: PDN root
70: LBO route

Claims (12)

A method of supporting a local breakout (LBO) service at a serving gateway of a wireless communications network,
Generating S1-TEID when the user terminal is connected and storing the generated S1-TEID in the database together with the information of the user terminal;
A destination terminal address extracting step of extracting a destination terminal address from a packet transmitted from the user terminal and received from the cell base station;
Determines whether there is an identical address by comparing the extracted destination terminal address with the LBO terminal address stored in advance in the database, and determines one of the PDN route and the LBO route as a route to transmit the packet received from the cell base station to the final destination terminal, Determining an LBO route when an address exists, and transmitting the packet to the LBO route;
And deletes the Outer IP header and the GTP header of the packet according to the determination of the LBO route, modifies the SIP (Source IP address) of the IP header to generate an LBO address, and transmits the S1-TEID using the LBO address as a key Storing in the database; And
Upon receipt of a packet from the destination terminal, an S1-TEID corresponding to the LBO address generated from the packet is obtained from the database, and the information of the user terminal corresponding to the obtained S1-TEID is obtained from the database Transmitting a packet received from the destination terminal to the user terminal using the obtained information of the user terminal;
The method of claim 1, wherein the LBO service is provided by the serving gateway. The method of claim 1, wherein the LBO terminal address is
Wherein the LBO service is a destination terminal address previously designated among a plurality of destination terminals included in the LBO network and stored in the database. delete The method as claimed in claim 1, wherein, in the step of storing the S1-TEID in the database with the LBO address as a key,
And changing the SIP of the IP header from the user terminal address to the serving gateway address. delete The method of claim 1, wherein the LBO route
And a packet movement path in which a packet transmitted from a user terminal is connected to a destination terminal through a cell base station and a serving gateway. 1. A serving gateway of a wireless communication network supporting a local breakout (LBO) service,
A table management module for generating the S1-TEID when the user terminal is connected and storing the S1-TEID in the database together with the information of the user terminal, and extracting the destination terminal address from the packet received from the user terminal and received from the cell base station;
Determines whether there is an identical address by comparing the extracted destination terminal address with an LBO terminal address stored in advance in the database, and determines a PDN route or an LBO route as a route to transmit a packet received from the cell base station to a final destination terminal, A packet path determination module that determines the LBO route as an LBO route and transmits the packet to the LBO route; And
And deletes the Outer IP header and the GTP header of the packet according to the determination of the LBO route, modifies the SIP (Source IP address) of the IP header to generate an LBO address, and transmits the S1-TEID using the LBO address as a key And an LBO address generation module for storing the LBO address in the database,
The packet path determination module includes:
When receiving a packet from the destination terminal, acquires S1-TEID corresponding to the LBO address generated from the packet to the database, acquires information of the user terminal corresponding to the acquired S1-TEID from the database And transmits the packet received from the destination terminal to the user terminal using the obtained information of the user terminal. The method of claim 7, wherein the LBO terminal address is
Is a destination terminal address previously specified among a plurality of destination terminals included in the LBO network and stored in the database. delete The method of claim 7, wherein the LBO address generation module
And the SIP of the IP header is changed from the user terminal address to the serving gateway address. 11. The method of claim 10, wherein the LBO route
Wherein the packet is a packet movement path in which a packet transmitted from a user terminal is connected to a destination terminal through a cell base station and a serving gateway. 12. The method of claim 11,
If the packet path determination module determines that the packet transmission path is a PDN route by determining that the packet is an address mismatch,
The serving gateway
A PDN root control unit for modifying the packet header so that the packet is transmitted to the final destination terminal via the Internet according to the PDN route decision of the packet path determination module;
Wherein the PDN route is further implemented.

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