KR20160042653A - Method for processing packet of local breakout, apparatus and system for the same - Google Patents

Abstract

The present invention relates to a method for transmission of incoming data for a local break out, and an apparatus and system for the same. The present invention comprises a service server which connects a specific connection network and an external server in a communication network including one or more connection networks and a core network connecting the one or more connection networks. The service server determines whether a terminal is in a state of being connected to the specific connection network or in an idle state of being released from connection when receiving a first format packet, of which a destination is a terminal located in the specific connection network, transmits the first format packet to a packet data network gateway of the core network in order to be transmitted to the terminal over the core network and the specific connection network when the terminal is in the idle state based on the determination result; converts the first format packet into a second format packet, to be transmitted from the core network to the connection network, in order to be transmitted to the terminal over the specific connection network when the terminal is in the connection state; and transmits the second format packet to the connection network, thereby enabling the incoming data to be efficiently transmitted to the terminal regardless of a state of the terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for transmitting an incoming data for a local breakout,

The present invention relates to a method and apparatus for transmitting an incoming data for a local breakout, and more particularly, to a method and apparatus for transmitting an incoming data to a terminal which is in an idle state, Out, and an apparatus and system for the same.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

Generally, a mobile communication system has been developed to provide voice service while ensuring the user's activity. However, the mobile communication system is gradually expanding not only to voice but also to data service, and now it has developed to the extent of providing high-speed data service. However, in a mobile communication system in which a service is currently provided, a lack of resources and users demand higher speed services, and therefore, a more advanced mobile communication system is required.

In response to this demand, LTE (Long Term Evolution), which is a next generation mobile communication system, has been highlighted. LTE is a technology for implementing high-speed packet-based communication with a transmission rate of up to 100 Mbps. Mobile data traffic using the LTE network is transmitted to the Internet network via an EPC (Evolved Packet Core), which is an LTE core network.

Meanwhile, data traffic has been exploding in recent years due to the emergence of various types of mobile devices such as smart phones and tablet PCs. Since mobile data traffic using LTE network is transmitted through EPC, the increase of mobile data traffic causes overload of traffic in core network. In general, when data is transmitted through the core network, the user has to pay a relatively large data usage fee.

Accordingly, local breakout techniques have been proposed for off loading the traffic concentrated in the core network in the access network.

However, there is a problem that local break-out techniques to date are for traffic distribution concentrated in the core network, and it is difficult to provide a local-based specialized service. Also, there is a problem in that a core network or a base station There is a problem that a design change is required.

In particular, in the LTE network, when there is no data to be transmitted / received to / from a location-registered terminal, the radio resources allocated to the terminal are released and transition to an idle state. When there is data to be transmitted / received, To the connected state. In this case, in order to transition from the idle state to the connection state, a signaling procedure of a Mobility Management Entity (MME) provided in the core network is required, and when the terminal transits to the dormant state during the local breakout operation, There is a problem in that the incoming data can be transmitted to the terminal of the terminal.

Korean Patent Publication No. 2014-0018091, published on Feb. 12, 2014 (name: Traffic offloading method and apparatus considering congestion in a wireless communication system)

In the present invention, in performing local break-out for offloading from an access network to an access network without going through a core network, it is unnecessary to add an additional facility and transmit incoming data to a terminal transited to an idle state, And an apparatus and a system for the local transmission.

As a means for solving the above-mentioned problems, the present invention provides a packet transmission system comprising: a first interface unit connected between an access network and a core network, for transmitting and receiving a packet between the access network and a core network; A second interface unit connected to an external server for transmitting / receiving a packet to / from the external server; A third interface unit connected to the core network for packet transmission / reception with the core network; A storage unit for storing terminal status information indicating whether a terminal located in the access network is in a connection state or an idle state and tunneling information established between the access network and the core network to the terminal; And if the first type packet is received from the external server through the second interface unit, the first type packet indicating the terminal status of the terminal is received, and if the terminal is in the idle state, the first type packet is transmitted to the third interface unit To the core network and to the terminal through the core network and the access network.

In the service server according to the present invention, when the terminal is in a connected state, the controller transmits the first type packet from the core network to the access network using tunneling information of the terminal established between the core network and the access network And then transmit the second type packet through the first interface unit so that the second type packet is transmitted to the terminal through the access network.

In addition, in the service server according to the present invention, the controller monitors the signaling message transmitted between the base station of the access network and the mobility management apparatus of the core network through the first interface unit, and transmits the terminal status information and the tunneling information And if the specific terminal transits from the connected state to the dormant state as a result of the monitoring, the terminal state information and the tunneling information of the terminal may be deleted after a predetermined time elapses.

In addition, the present invention provides, as another solution to the above-mentioned problem, to provide a packet data communication system, which is provided between a service server and a core network and receives a first type packet transmitted from a service server, A routing device for forwarding to the gateway; A switching unit provided between an access network and a core network for delivering a second type packet transmitted from the access network to the core network to the service server and delivering a second type packet transmitted from the service server to the access network; And managing terminal status information indicating whether a terminal located in the access network is in a connection state or an idle state and managing tunneling information set between the access network and the core network with respect to the terminal, Wherein the first type packet is transmitted to the routing apparatus when the packet is received in the idle state, and the first type packet is transmitted to the routing apparatus when the packet is in the idle state. 2 type packet and transmits the converted packet to the switching device.

In the packet processing system for local breakout according to the present invention, the switching device may include a packet including a predetermined base station identification information or cell identification information among the second type packets transmitted from the access network to the core network, The service server can select a packet whose destination is the server and deliver it to the service server. At this time, the service server can convert the second format packet transmitted from the switching device into the first format packet and transmit the packet to the external server .

According to another aspect of the present invention, there is provided a packet processing method for local breakout in a communication network including a core network connecting at least one access network and at least one access network, Receiving a first type packet destined for a terminal located in the specific access network from the external server; Determining whether the terminal is connected to the specific access network or is in a disconnected state; Transmitting the first type packet to the packet data network gateway of the core network so as to be transmitted to the terminal through the core network and the specific access network when the terminal is in a dormant state; And converting the first format packet into a second format packet transmitted from the core network to the access network so as to be transmitted to the terminal through the specific access network when the mobile terminal is in a connected state as a result of the determination, The method comprising the steps of:

The present invention discloses a method for offloading data transmitted and received between a predetermined external server and a terminal to a terminal via a specific access network without passing through a core network in a communication network including at least one access network and a core network connecting the at least one access network, If the terminal is in the idle state, transmits a packet to be transmitted to the terminal to the packet data network gateway of the core network, thereby managing the terminal through the mobility management apparatus provided in the core network As a result, it is possible to transmit the incoming data to the idle terminal without adding a separate facility (for example, a mobility management apparatus) for transiting the idle state of the terminal to the connected state do.

In addition, various effects other than the above-described effects can be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is a diagram illustrating a structure of a packet processing system for local breakout according to an embodiment of the present invention.
2 and 3 are diagrams for explaining a packet transmission path for local breakout by the packet processing system according to the present invention.
4 is a block diagram illustrating a main configuration of a service server according to an embodiment of the present invention.
5 is a block diagram showing the configuration of the control unit in the service server according to the embodiment of the present invention in more detail.
6 is an exemplary diagram of tunneling information generated based on a signaling message according to an embodiment of the present invention.
7 is an exemplary diagram of UE status information according to an embodiment of the present invention.
8 is a flowchart illustrating a method of transmitting an incoming data for local break-out of a service server according to an embodiment of the present invention.
9 is a message flow diagram for explaining a packet processing process for local breakout in the upward direction in the packet processing system according to the embodiment of the present invention.
10 and 11 are a message flow diagram illustrating a packet processing process for a local breakout in a downward direction in the packet processing system according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings and the inventor is not limited to the concept of terminology for describing his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

Also, terms including ordinal numbers such as first, second, etc. are used to describe various elements, and are used only for the purpose of distinguishing one element from another, Not used. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

In addition, when referring to an element as being "connected" or "connected" to another element, it means that it can be connected or connected logically or physically. In other words, it is to be understood that although an element may be directly connected or connected to another element, there may be other elements in between, or indirectly connected or connected.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprising "or" having ", as used herein, are intended to specify the presence of stated features, integers, It should be understood that the foregoing does not preclude the presence or addition of other features, numbers, steps, operations, elements, parts, or combinations thereof.

1 to 3, a network structure to which the present invention is applied and a structure of a packet processing system for local breakout according to the present invention will be described.

FIG. 1 illustrates a packet processing system for local breakout according to the present invention, and FIGS. 2 and 3 illustrate a packet transmission path in a communication network to which a packet processing system according to the present invention is applied.

The packet processing system for local breakout according to the present invention can be applied to a network including at least one access network 200 and a core network 400 and a specific access network 200 without going through the core network 400 And may include a switching device 300, a routing device 440, and a service server 600 for transmitting / receiving packets between a user equipment 100 and an external server 700 through a network. Here, the communication network to which the present invention is applied may be, for example, a currently commercialized LTE (Long Term Evolution) network, or may include other networks equivalent to this, or a combination of various types of networks.

Hereinafter, each component shown in FIG. 1 will be described in detail.

The terminal 100 is a user equipment and is connected to an external network, for example, the Internet network 500 through the access network 200 and the core network 400, And a server (not shown) for providing information. At this time, the terminal 100 accesses the Internet network 500 through the eNB 210, the switching device 300, the S-GW 420 and the P-GW 430 of the access network 200. The terminal 100 may include a browser for transmitting and receiving information, a memory for storing programs and protocols, and a microprocessor for executing and controlling various programs.

The access network 200 may be configured to include an eNode (eNodeB) 210, which is connected to the AT 100 and transmits and receives data to the AT 100. Here, the eNB 210 is a base station apparatus of an LTE network including a base station and a base station controller supporting connection of the terminal 100. For reference, the eNB 210 may be replaced with a base station controller such as a base station (BS), a base transceiver station (BTS), a NodeB, and a base station controller (BSC) or a radio network controller (RNC). In addition, the base station apparatuses including the eNB 210 are divided into a digital unit (DU) for processing a digital signal and a radio unit (RU) for processing a radio signal. It may be implemented by installing only a wireless unit and concentrating digital units.

The core network 400 is connected to one or more access networks 200 to perform packet exchange between the at least one access network 200 and between the at least one access network 200 and the Internet network 500. Specifically, the core network 400 performs a main function for mobile communication services such as call processing, mobility control and switching between the access networks 200, and manages interworking with an external network, for example, And controls. The core network 400 may include a plurality of entities that perform the functions described above. For example, the core network 400 includes a Mobility Management Entity (MME) 410, a Serving Gateway (S-GW) 420, and a packet data gateway (P-GW) (Mobile Switching Center), a Home Location Register (HLR), and a Home Subscriber Server (HSS), which are not shown in the figure.

Among them, the MME 410, the S-GW 420 and the P-GW 430 related to the present invention will be briefly described.

First, the MME 410 refers to a mobility management apparatus that manages mobility of the AT 100. The MME 410 includes a non-access signaling (NAS), a signaling security (NAS) signaling, a mobility management of the terminal 100, , Roaming, authentication, and bearer management, for example. In addition, when a user desires to use a data service using the terminal 100, the terminal 100 may perform a paging function.

The S-GW 420 refers to a serving gateway that processes traffic for a plurality of eNBs 210. In addition, it can interwork with the P-GW 430 to support transmission of a transmission / reception packet of the terminal 100, and can perform an anchoring function when a handover occurs.

The P-GW 430 processes traffic between the core network 400 to which the P-GW 430 belongs and another network, such as the Internet network 500, other than the core network 400 to which the P-GW 430 belongs. The P-GW 430 includes a service policy enforcement, a per-user based packet filtering, a charging support, a lawful interception, a user terminal IP allocation allocation, packet screening, and the like. In addition, the P-GW 430 performs different QoS policies for each of the terminals 100 and controls traffic.

The MME 410, the S-GW 420 and the P-GW 430 described above may be referred to as a packet core device (EPC) as a main entity of the core network 400.

In addition, the MME 410 can send and receive messages through S1 signaling. At this time, it may be connected to the S-GW 420 through the S1-U interface, and may be connected to the P-GW 430 through the S5 interface.

The terminal 100 performs location registration through the MME 410 and allocates resources of the access network 200 and the core network 400 to the access network 200 as in the case of the path (1) (For example, a server of the service provider or another terminal) located in the Internet network 500 via the core network 400 and the core network 400. [

In this case, the packet processing system for local breakout according to the present invention transmits traffic between a terminal 100 connected to a specific access network 200 and a specific external server 700 connected to the service server 600, And is for off-loading through the access network 200 without passing through the core network 400 as shown in the path (2).

The switching apparatus 300 is located between the access network 200 and the core network 400 and is connected to the service server 600. The switching device 300 may selectively transmit a specific packet to the service server 600 under the control of the service server 600 among the packets transmitted and received between the access network 200 and the core network 400. For example, the switching device 300 may transmit a packet including the predetermined base station identification information or the cell identification information among the packets transmitted between the access network 200 and the core network 400, May be selected and transmitted to the service server 600.

The service server 600 transfers the packet transmitted from the switching device 300 to the external server 900 and transmits the packet transmitted from the external server 700 to the access network 200 through the switching device 300 To the connected terminal 100.

Here, the packet transmitted between the access network 200 and the core network 400 may be different from the packet transmitted / received by the external server 700. For example, the external server 700 transmits and receives TCP / IP packets according to TCP / IP (Transmission Control Protocol / Internet Protocol), and the access network 200 and the core network 400 transmit GPRS Tunneling Protocol Based packets can be transmitted and received. Here, packets that can be processed by the external server 700 are referred to as first type packets, and packets transmitted to the access network 200 and the core network 400 are referred to as second type packets.

In consideration of this point, the service server 600 manages the tunneling information for the configuration of the second type packet, refers to the tunneling information, and transmits the second type packet transmitted from the switching device 300 1 format packet to the external server 700, converts the first format packet transmitted from the external server 700 into the second format packet, and transmits the packet to the switching device 300.

Therefore, the traffic between the specific external server 700 and the terminal 100 is transmitted through the path (2) of FIG. 2 through the switching device 300 and the service server 600 without passing through the core network 400 .

At this time, the terminal 100 connected to the access network 200 may transition to a dormant state in which the resource allocation of the access network 200 is released according to the situation of the terminal 100 or the communication network.

In consideration of this, the service server 600 according to the present invention manages terminal state information of the terminal 100, and when receiving a packet to be transmitted from the external server 700 to the terminal 100, GW (P-GW) of the core network 400 through the routing device 440 without directly converting the first format packet into the second format packet, if it is in the idle state, 430). The routing device 440 is provided between the service server 600 and the core network 400 and transmits the first format packet received when the first format packet transmitted from the service server 600 is received, To the P-GW 430 of the network.

The P-GW 430 is configured to perform anchoring to the external network in the core network 400. When a packet is received from the Internet network 500, the P-GW 430 checks the destination, that is, the location of the terminal 100 The GW 420 delivers the packet to the S-GW 420 connected to the access network 200 where the terminal 100 is located and the S-GW 420 transmits the packet to the access network 200 again.

Similarly, the P-GW 430 transmits the first type packet transmitted from the service server 600 to the access network 200 through the S-GW 420.

The MME 410 of the core network 410 confirms the idle state of the UE 100 and performs a paging procedure to wake up the UE 100. After that, And transits the terminal 100 to a connection state in which data transmission / reception is possible again.

Therefore, when the terminal 100 is in the idle state, the service server 600 searches for the incoming data transmitted from the external server 700 to the terminal 100 as shown in the path (3) And transmits the packet through the MME 410 of the core network 410 by transiting the terminal 100 to the connected state and after the terminal 100 transitions to the connected state, After converting the first format packet transmitted from the external server 700 into the second format packet and then switching the connection network 200 through the switching device 300 without passing through the core network 600, ).

In the above, the path (3) is used once to transition the idle state to the connected state when the terminal 100 is in the idle state, and all the following incoming data is transmitted through the path (4) In implementing the breakout, it is possible to effectively transmit the incoming data to the dormant terminal 100 without adding equipment and increasing the cost.

The main configuration and operation of the service server 600 according to the embodiment of the present invention will be described with reference to FIG. 4 to FIG.

FIG. 4 is a block diagram illustrating a main configuration of a service server 600 according to an embodiment of the present invention. FIG. 5 is a diagram illustrating a configuration of a control unit 650 in a service server 600 according to an embodiment of the present invention. And is a block diagram for explaining more specifically.

4, a service server 600 according to an embodiment of the present invention includes a first interface 610, a second interface 620, a third interface 630, a storage unit 640, And a control unit 650. [0034]

The first interface unit 610 is connected between the access network 200 and the core network 400 and transmits a packet transmitted between the access network 200 and the core network 400. [ Or transmits a packet between the access network 200 and the core network 400. The first interface unit 610 is connected between the access network 200 and the core network 400 through the switching device 300 as shown in FIG. The first interface unit 610 transmits and receives a second format packet.

The second interface unit 620 supports connection with the external server 600, and transmits / receives the first type packet. The second interface unit 620 may be connected to the external server 700 through a NAT (Network Address Translation).

The third interface unit 630 is connected to the core network 400 and more specifically to the P-GW 430 and transmits a packet to the P-GW 430 of the core network 400. The third interface unit 630 may be connected to the P-GW 430 through the routing unit 440.

The storage unit 640 stores information necessary for performing an operation of the service server 600 according to the present invention. The storage unit 640 stores the information necessary for performing operations of the terminal 100 located in the access network 200, Tunneling information 641 established between the access network 200 and the core network 400 and terminal status information 642 indicating whether the terminal 100 is connected or idle.

The control unit 650 performs overall control of the service server 600. The control unit 650 includes a memory (e.g., a register and / or a RAM (Random Access Memory)) in which at least one processor and at least one execution data are loaded, And a bus (BUS) for inputting / outputting at least one or more data to / from the processor and the memory. Also, a predetermined program loaded from the predetermined recording medium to the execution memory to perform a function defined in the service server 600 (for example, a packet processing function for local breakout) A routine, or program data.

The controller 650 of the present invention is functionally connected to the first interface 610, the second interface 620 and the storage 640 and is operatively coupled to the local interface 620, The function of which will be described with reference to FIG.

3, the controller 650 includes a monitoring module 651, a packet processing module 652, and a tunneling management module 653 to perform packet processing for local breakout according to the present invention. .

The monitoring module 651 monitors packets transmitted and received between the access network 200 and the core network 400 through the first interface unit 610 and transfers the packets to the packet processing module 652, And then transmits the resultant data to the controller 653. Specifically, the monitoring module 651 transmits a signaling message (for example, an S1 signaling message) among the packets transmitted through the first interface 610 to the tunneling management module 653, (652).

The packet processing module 652 performs a process of converting packets between the access network 200 and the external server 700 so that they can be recognized by each.

To describe this in more detail, a packet transmission method in a general mobile communication network will be described first.

Transmission / reception packets of the terminal 100 between the access network 200 and the core network 400 may be tunneled differently from the Internet network 500 and transmitted. For the sake of convenience, the GTP tunneling scheme will be described as an example. However, the GTP tunneling scheme is not limited to the tunneling scheme, but various tunneling schemes such as IPinIP tunneling (GTP tunneling) and GRE tunneling .

That is, the terminal 100 transmits an IP packet including source address information (= address information of the terminal 100) and destination address information (e.g., 111.111.111.111) to the access network 200.

The eNB 210 of the access network 200 that receives the tunneling mode adds a GTP header for GTP tunneling to the packet transmitted from the AT 100 in order to tunnel and transmit the IP packet according to the tunneling mode, To the S-GW 420 of the core network 400.

The resulting GTP packet may include the following structure.

Header (GTP header) added by eNB Packets sent by the terminal Outer IP header: SIP = eNB, DIP = S-GW UDP header GTP header: TEID = X IP header: SIP = Terminal, DIP = 111.111.111.111 IP Payload

The S-GW 420 receiving the GTP packet from the eNB 210 re-transmits the Outer IP header and the GTP header. The resulting GTP packet may include the following structure.

The header added by the S-GW (GTP header) Packets sent by the terminal Outer IP header: SIP = S-GW, DIP = P-GW UDP header GTP header: TEID = Y IP header: SIP = Terminal, DIP = 111.111.111.111 IP Payload

Then, the P-GW 430 removes the GTP header, restores the original IP packet transmitted by the terminal 100, and transmits the IP packet to the content providing apparatus (not shown) corresponding to the destination address via the Internet 500 ) To transmit the packet.

On the other hand, even when a packet is transmitted from the Internet 500 to the AT 100, the GTP header is further transmitted from the Internet network 500 to the core network 400 receiving the IP packet destined for the AT 100 And transmits the GTP packet to the eNB 210 of the access network 200. The eNB 210 of the access network 200 receives the GTP packet and removes the GTP header for GTP tunneling from the received GTP packet, IP packet and transmits the packet to the terminal 100 through the wireless section.

At this time, the IP packet transmitted from the AT 100 to the core network 400 is converted into the GTP packet via the eNB 210 of the access network 200 and is transmitted to the core network 400, as described above. And is then passed through the switching device 300. At this time, the switching device 300 blocks transmission of the GTP packet to the core network 400 when the corresponding GTP packet is a packet according to the control information provided by the service server 600, 600). ≪ / RTI > For example, the switching device 300 may refer to the base station identification information or the cell identification information included in the GTP packet, or may determine whether the packet is a designated packet by checking the destination address information.

The GTP packet transmitted from the switching device 300 to the service server 600 is transmitted to the uplink processing module 652a of the packet processing module 652 through the monitoring module 651. [

The uplink processing module 652a deletes the GTP header from the delivered GTP packet and converts it into an IP packet in order to deliver the delivered GTP packet to the external server 700. [ And transfers the IP packet converted into the external server 700 corresponding to the destination address in the converted IP packet.

Also, the service server 600 receives a packet transmitted from the external server 700 to the terminal 100. At this time, the external server 700 delivers the packet to the terminal 100 in the form of an IP packet.

The controller 650 of the service server 600 receives the IP address of the terminal 100 and checks the terminal status information 642 of the terminal 100 by referring to the destination address in the IP packet to determine whether the terminal 100 is currently connected, State. At this time, in the idle state, since the radio resources between the terminal 100 and the access network 200 are released and the packet can not be delivered, the received IP packet is transmitted through the third interface unit 630 to the core network 400 To the P-GW 430 in FIG. The P-GW 430 processes the IP packet in the same manner as an externally transmitted packet and transmits the IP packet to the access network 200 through the S-GW 420. At this time, the terminal 100 transitions to the connection state according to the paging procedure of the MME 410.

The controller 650 of the service server 600 transmits the IP packet to the eNB 210 of the access network 200 through the downlink processing module 652b when the terminal 100 is connected A GTP packet is converted into a GTP packet. That is, the downlink processing module 652b confirms the destination address of the IP packet transmitted from the external server 700, confirms the tunneling information 641 of the corresponding terminal 100, and then uses the tunneling information 641 GTP header. Then, the GTP header is added to the IP packet to be converted into a GTP packet. The converted GTP packet is transmitted to the access network 200 through the first interface unit 610.

The tunneling management module 653 generates the tunneling information 641 and the terminal status information 642 for each terminal 100 in advance and stores the tunneling information 641 and the terminal status information 642 in the storage unit 640. [

Specifically, the tunneling management module 653 collects the S1 signaling messages transmitted and received between the access network 200 and the core network 400, and transmits the S1 signaling message, which is information necessary for generating the GTP header of the terminal 100, 6, and generates the tunneling information 641 as shown in FIG. 6, extracts at least one of the stream control transmission protocol, the UE context, and the bearer (E-RAB) (E.g., UE Context Release request, UE Context Release Command, and UE Context Release Complete) generated according to the UE status information 642 shown in FIG. 7 to generate UE status information 642 as shown in FIG. For reference, the terminal status information 642 can be generated only for the terminal 100 in which the tunneling information 641 is generated.

6, the tunneling information 641 includes at least one of a mobility management apparatus IP, a mobility management apparatus port, a base station IP, and a base station port, A serving gateway IP, a serving gateway TEID, a base station IP, and a base station TEID) as the bearer information, and at least one of the mobility management apparatus S1AP ID and the base station S1AP ID. .

In addition, the above-described tunneling information 641 can be created, changed, or deleted in accordance with the S1 signaling message described in Table 3. [

Terminal status S1 signaling message produce If an initial context setup request (Initial Context Setup Req Terminal st) message is transmitted from the MME,
When an initial context setup response (initial context setup request terminal st) message, which is a response to the initial context setup request message, is transmitted from the eNB A handover request message (Handover Req terminal st) message is transmitted from the MME,
When a handover request acknowledgment message (handover request terminal acknowledgment message) in response to the handover request message is transmitted from the eNB a path change request (Path Switch Req terminal st) message is transmitted from the eNB,
When a path change request message (Path Switch Req Terminal Acknowledge) message, which is a response to the path change request message, is transmitted from the MME change A message of a radio access bearer setup request (E-RAB Setup Req Terminal st) is transmitted from the MME,
When a radio access bearer setup response (E-RAB Setup Response) message, which is a response to the radio access bearer setup request message, is transmitted from the eNB When the radio access bearer release command (E-RAB Release Command) message is transmitted from the MME When a radio access bearer release indication (E-RAB Release Indication) message is transmitted from the eNB release When a UE Context Release Command message is delivered from the MME When a handover failure message is transmitted from the eNB When a reset message is transmitted from the MME or the eNB

7, the terminal status information 642 is mapped to the terminal identification information and / or the terminal IP address with status information. In addition, when the terminal status information 642 is in the idle state, the terminal status information 642 further includes the preset expiration time information do. The expiration time information is counted from the point of transition to the dormant state. The controller 651 maintains the corresponding terminal state information until the expiration time is reached, and when the expiration time is reached, the connection of the terminal 100 is completely The terminal status information and the tunneling information of the corresponding terminal are deleted. The expiration time information is preferably set in accordance with a time period during which the idle state of the core network 400 is maintained.

In particular, when the UE Context Release Command is received from the MME 410, the tunneling management module 653 transitions the UE state information of the UE 100 into a dormant state, executes a timer, Upon reaching the tunneling information, the corresponding tunneling information can be deleted.

As described above, the main components and operations of the service server 600 have been described. However, it should be noted that the components shown in FIGS. 4 and 5 are not all essential components, and the service server 600 may be implemented by more components than the illustrated components, (600) may be implemented. In addition, the service server 600 may be implemented as a collection of servers supporting various functions.

It should be noted that the location of the components of the service server 600 shown in FIGS. 4 and 5 may be changed for convenience or for other reasons.

A processor mounted on the service server 600 according to an embodiment of the present invention can process program instructions for executing the method according to the present invention. In one implementation, the processor may be a single-threaded processor, and in other embodiments, the processor may be a multithreaded processor. Further, the processor is capable of processing instructions stored on a memory or storage device.

In addition, the term 'module' used in the embodiment of the present invention means a software component, and a 'module' performs certain roles. As an example, a "module" may include components such as software components, object-oriented software components, class components and task components, and processes, functions, attributes, , Segments of program code, drivers, data, databases, data structures, tables, arrays, and variables. In addition, the functions provided in the components and 'modules' may be combined into a smaller number of components and '~ modules' or further separated into additional components and 'modules'.

Although the present specification and drawings describe exemplary device configurations, the functional operations and subject matter implementations described herein may be embodied in other types of digital electronic circuitry, or alternatively, of the structures disclosed herein and their structural equivalents May be embodied in computer software, firmware, or hardware, including, or in combination with, one or more of the foregoing. Implementations of the subject matter described herein may be embodied in one or more computer program products, i. E. One for computer program instructions encoded on a program storage medium of the type for < RTI ID = 0.0 & And can be implemented as a module as described above. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter that affects the machine readable propagation type signal, or a combination of one or more of the foregoing.

8 is a flowchart illustrating a method of transmitting an incoming data for local breakout performed by the service server 600 according to the present invention.

Referring to FIG. 8, the service server 600 monitors a signaling message exchanged between the access network 200 and the core network 400 and transmits tunneling information 641 of the terminal 100 located in the access network 200 Together, the terminal status information 642 is collected and managed (S110).

When an IP packet destined for the terminal 100 located in the access network 200 is received from the external server 700 in operation S120,

The terminal 100 determines whether the terminal 100 is connected to the access network 200 or is disconnected from the access network 200 in operation S130.

The service server 600 refers to the tunneling information 641 to be transmitted to the terminal 100 through the access network 200 and converts the IP packet into a GTP packet , And then transmitted to the access network 200 through the switching device 300 (S140, S150).

On the contrary, in the idle state, the service server 600 transmits the IP packet to the P-GW 400 of the core network 400 to be transmitted to the terminal 100 through the core network 400 and the access network 200. [ (Step S160). Therefore, the core network 400 pauses the terminal 100 in the idle state through the MME 410 and transitions to the connection state, and then transmits the IP packet to the access network 200 through the GTP tunnel .

The outgoing data transmitted from the terminal 100 is transmitted to the service server 600 through the switching device 30 and is converted into an IP packet by the service server 600 and then transmitted to the external server 700 do.

Next, a packet processing process to which an incoming data transmission method for local breakout according to an embodiment of the present invention is applied will be described with reference to FIGS. 9 to 11. FIG.

9 is a data flow chart for explaining a packet processing method for local breakout in the upward direction according to the embodiment of the present invention.

Referring to FIG. 9, the UE 100 may allocate radio resources to the access network 200 through the S1 signaling procedure and transmit the IP packet to the eNB 210 of the access network 200 (S201).

The eNB 210 of the access network 200 receives the GTP header and converts the GTP packet into a GTP packet (S203). Then, the converted GTP packet is transmitted to the core network 400 (S205).

At this time, the switching device 300, which is located between the access network 200 and the core network 400 and monitors packets transmitted and received, determines that the corresponding GTP packet is the destination of the external server 700, If the cell identification information is included, the transmission to the core network 400 is interrupted (S207), and the GTP packet is transmitted to the service server 600 (S209).

In step S213, the service server 600 deletes the GTP header from the GTP packet and restores the GTP header into an IP packet in step S211, and transmits the restored IP packet to the external server 700 in step S213.

Therefore, a packet transmitted from the terminal 100 connected to the specific access network 200 to the external server 700 can be directly offloaded from the access network 200 to the external server 700 without going through the core network 400 .

Next, FIGS. 10 and 11 are a message flow diagram illustrating a packet processing process for a local breakout in a downward direction in the packet processing system according to the embodiment of the present invention.

10, when the IP packet is received from the external server 700 (S301), the service server 600 checks the destination address of the delivered IP packet and refers to the destination address, 100 and its terminal status information (S303).

If it is determined that the terminal 100 is idle (S305), the service server 600 confirms the tunneling information previously stored corresponding to the terminal 100 (S307) Into a GTP packet (S309). At this time, the service server 600 extracts a downlink directional base station TEID, a downlink directional base station IP, and a downlink directional serving gateway TEID for downlink traffic transmission in the tunneling information, generates a GTP header using the extracted TEID, It is converted into a GTP packet in addition to the IP packet.

The service server 600 can transmit the converted GTP packet to the eNB 210 of the access network 200 through the switching device 300 at step S313 and the eNB 210 transmits The GTP header is deleted from the GTP packet and restored to the original IP packet (S315), and the restored IP packet is transmitted to the terminal 100 (S317).

11, the service server 600 directly transmits the received IP packet to the P-GW 430 of the core network 400 in step S305, if the terminal 100 is in the idle state (S319). If the IP packet is not an GTP or SCTP packet but an IP packet, the IP packet may be forwarded to the P-GW 430 through a routing device 440 having a routing table.

The IP packet is converted into a GTP packet set between the P-GW 430 and the S-GW 420 by the P-GW 430 and transmitted to the S-GW 420, After storing the received GTP packet (S321), the MME 410 notifies the MME 410 of the reception data and receives response information including information on the connection state of the terminal 100 (S323 ).

If the terminal 100 is in the idle state, the MME 410 transmits a paging signal to the terminal 100 to wake up the terminal 100 (S325), and then transmits the paging signal to the terminal 100, the MME 410 and the S-GW 420 in step S327, the procedure for activating the downlink path is performed.

When the downlink path is activated, that is, when the released radio resources are reconnected, the S-GW 420 transmits the stored GTP packet to the eNB 210 (S329) The GTP packet is restored to an IP packet and transmitted to the terminal 100 (S331, S333).

When the terminal 100 is in the idle state, the incoming data transmitted from the external server 700 is transmitted to the terminal 100 through the core network 400 and the access network 200, The IP packet transmitted from the external server 700 may be directly transmitted to the terminal 100 through the access network 200 as shown in FIG.

The packet processing method for local breakout of the present invention as described above may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. At this time, a computer-readable medium suitable for storing computer program instructions and data includes, for example, a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such a hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

The present invention discloses a method for offloading data transmitted and received between a predetermined external server and a terminal to a terminal via a specific access network without passing through a core network in a communication network including at least one access network and a core network connecting the at least one access network, If the terminal is in the idle state, transmits a packet to be transmitted to the terminal to the packet data network gateway of the core network, thereby managing the terminal through the mobility management apparatus provided in the core network As a result, it is possible to transmit the incoming data to the idle terminal without adding a separate facility (for example, a mobility management apparatus) for transiting the idle state of the terminal to the connected state do.

In addition, various effects other than the above-described effects can be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

100: terminal 200: access network 210: eNB
300: switching device 400: core network 410: MME
420: S-GW 430: P-GW 440: routing device
500: Internet network 600: service server 610: first interface unit
620: second interface unit 630: third interface unit 640:
650: control unit 651: monitoring module 652: packet processing module
652a: Uplink processing module 652b: Downlink processing module
653: tunneling management module 700: external server

Claims (10)

A first interface unit connected between an access network and a core network for transmitting and receiving packets between the access network and the core network;
A second interface unit connected to an external server for transmitting / receiving a packet to / from the external server;
A third interface unit connected to the core network for packet transmission / reception with the core network;
A storage unit for storing terminal status information indicating whether a terminal located in the access network is in a connection state or an idle state and tunneling information established between the access network and the core network to the terminal; And
When the first type packet is received from the external server through the second interface unit, the terminal status information of the terminal is received, and if the first type packet is in the idle state, the first type packet is transmitted through the third interface unit A controller for transmitting the data to the core network and transmitting the data to the terminal through the core network and the access network;
The service server comprising: The apparatus of claim 1, wherein the control unit
And converting the first type packet into a second type packet transmitted from the core network to the access network using the tunneling information of the terminal established between the core network and the access network when the terminal is in a connection state, Format packet to be transmitted to the terminal through the access network through the first interface unit. The apparatus of claim 1, wherein the control unit
And monitoring the signaling message transmitted between the base station of the access network and the mobility management apparatus of the core network through the first interface unit to extract the UE status information and the tunneling information. 4. The apparatus of claim 3, wherein the control unit
Wherein the terminal deletes the terminal status information and the tunneling information of the terminal after a predetermined time elapses when the specific terminal transitions from the connected state to the dormant state as a result of the monitoring. A routing device provided between the service server and the core network for forwarding the received first type packet to the packet data network gateway of the core network when the first type packet transmitted from the service server is received;
A switching unit provided between an access network and a core network for delivering a second type packet transmitted from the access network to the core network to the service server and delivering a second type packet transmitted from the service server to the access network; And
Wherein the management server manages terminal status information indicating whether a terminal located in the access network is in a connection state or an idle state and tunneling information set up between the access network and the core network with respect to the terminal, Wherein the first type packet is transmitted to the routing device when the packet is received in the idle state, and the first format packet is transmitted to the routing device when the packet is in the idle state, Format packet and transmits the converted packet to the switching device;
Wherein the local break-out processing unit comprises: 6. The apparatus of claim 5, wherein the switching device
A packet including the cell identification information or the packet having the predetermined base station identification information or the packet destined for the external server among the second type packets transmitted from the access network to the core network and transmitting the selected packet to the service server Packet processing system for breakout. 6. The method of claim 5, wherein the service server
And converting the second format packet transmitted from the switching device into the first format packet and transmitting the packet to the external server. A method of processing a packet for local breakout in a communication network comprising at least one access network and a core network connecting the at least one access network,
Receiving from the external server a first type packet destined for a terminal located in the specific access network;
Determining whether the terminal is connected to the specific access network or is in a disconnected state;
Transmitting the first type packet to the packet data network gateway of the core network so as to be transmitted to the terminal through the core network and the specific access network when the terminal is in a dormant state; And
Converting the first format packet into a second format packet transmitted from the core network to the access network and transmitting the converted first format packet to the access network when the connection state is determined to be transmitted to the terminal through the specific access network;
The method comprising the steps of: receiving a local break-out request; 9. The method of claim 8,
Further comprising monitoring a signaling message exchanged between the specific access network and the core network to collect and manage the UE status information and tunneling information. 10. The method of claim 9, wherein the administering comprises:
Wherein the terminal state information and the tunneling information of the terminal are deleted after a predetermined time elapses when the terminal transitions from the connected state to the dormant state.

Images