KR101663655B1 - Method handing handover in private network environment and private environment therefor - Google Patents

Abstract

The present invention relates to a method of processing a handover between private base stations in a private network environment, and a private network system for the method. The private network system according to the present invention comprises: a first private base station which forms a first S1 bearer with an evolved packet core-network (EPC), relays a packet of a mobile communication terminal, which is transmitted to a public network via the first S1 bearer, forms a first local bearer with a private gateway, and relays a packet of the mobile communication terminal which is transmitted to the private network via the first local bearer; a second private base station which, during a handover of the mobile communication terminal, operates as a target base station to form a second S1 bearer with the EPC, process the packet of the mobile communication terminal, which is transmitted to the public network via the second bearer, and releases the first S1 bearer which is formed between the first private base station and the EPC; and a private gateway which receives a local path switching message from the second private base station to form a second local bearer with the second private base station, and changes a traffic direction of the first local bearer to that of the second local bearer, wherein the private gateway identifies the first local bearer based on information included in the local path switching message to release the first local bearer. According to the present invention, since not only a handover for data in a public network but also a handover for private data is performed, a seamless data service can be provided to the mobile communication terminal.

Description

TECHNICAL FIELD The present invention relates to a handover processing method in a private network environment and a private network system for the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handover technique, and more particularly, to a method for handling a handover between a private base station in a private network environment and a private network system therefor.

Nowadays, corporations or specific organizations provide communication services using private switches to perform calls quickly and cheaply. In addition, a service for performing VoIP (Voice over Internet Protocol) -based call through a private branch exchange has also been disclosed. The following patent documents disclose an apparatus and method for controlling a VoIP call in a private branch exchange.

Furthermore, a business or an organization may install a private base station and a private gateway to provide a private network service using the private base station and a private gateway. In addition, the private gateway provides a local breakout function to directly transmit the traffic of the terminal to the private network without going through the communication carrier network.

Meanwhile, 3GPP discusses LIPA (Local IP Access), which is a technology for connecting to a private network using a home evolved NodeB (HeNB) and an evolved packet core-network (EPC).

However, in order to apply the local breakout function to the LIPA technology, the HeNB and the nodes included in the EPC (i.e., MME, SGW, PGW, etc.) must be redesigned to conform to the standard proposed by 3GPP . In particular, a technique for guaranteeing mobility (i.e., handover) while providing a local breakout function has not been proposed in 3GPP.

Korean Patent Publication No. 10-2004-0052107

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve such a conventional problem, and it is an object of the present invention to provide a handover processing method for smoothly performing a handover between a private base station and a private base station among functions provided by a local break- The purpose of this paper is to provide a private network system.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to achieve the above object, a private network system according to a first aspect of the present invention forms an EPC (Evolved Packet Core-network) and a first S1 bearer, and is transmitted to the public network through the first S1 bearer A first private base station relaying packets of the mobile communication terminal, forming a first local bearer with the private gateway, and relaying packets of the mobile communication terminal transmitted to the private network through the first local bearer; Wherein the mobile communication terminal operates as a target base station to form a second S1 bearer with the EPC, processes a packet of a mobile communication terminal transmitted to the public network through the second bearer, A second private base station releasing the first S1 bearer formed between the private base station and the EPC; And generating a second local bearer and a second local bearer by receiving the local path change message from the second private base station to change the traffic direction of the first local bearer to the second local bearer, And a private gateway for identifying the first local bearer based on the information included in the first local bearer and releasing the first local bearer.

According to a second aspect of the present invention, there is provided a method for handling handover of private network data in a private network system, comprising: determining a handover from a source private base station to a target private base station; The target private base station forming an EPC (Evolved Packet Core-network) and a target S 1 bearer, and changing traffic for the public network to the target S 1 bearer; Receiving a local path change message from the target private base station; The private gateway creating target local bearers with the target private base station and changing traffic for the private network to the target local bearer; And the private gateway identifies a source local bearer formed with the source private base station based on the information included in the local path change message and releases the identified source local bearer.

When handover is performed in a private network, handover of private data generated through a local breakout function as well as handover of data of the public network is performed to transmit a seamless data service to mobile communication And provides it to the terminal.

In addition, the present invention provides an EPC-compliant mobile communication system that conforms to the 3GPP standard for EPC, and performs smooth handover of data transmitted to and received from a private network without affecting the existing public communication network through the function of a private gateway and the function of a private base station There is also.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and form a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention. And shall not be construed as limited to such matters.
1 is a diagram illustrating a communication system according to the present invention.
2 is a flowchart illustrating a method of forming a local bearer with a mobile communication terminal in a private network system according to an embodiment of the present invention.
3 is a flowchart illustrating a method of processing an X2 handover of a mobile communication terminal in a private network system according to an embodiment of the present invention.
4 is a flowchart illustrating a method of handling S1 handover of a mobile communication terminal according to another embodiment of the present invention.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a communication system according to the present invention.

Referring to FIG. 1, a communication system according to the present invention includes a mobile communication terminal 100, private base stations 210 and 220, an evolved packet core-network (EPC) 600, a packet data network (PDN) A private gateway 300, and a private network 400 (Enterprise Network).

The mobile communication terminal 100 may be referred to as another term such as a UE (User Equipment), a Mobile Station (MS), a User Terminal (UT), or a Subscriber Station (SS) as a device for providing voice communication or data communication. The mobile communication terminal 100 uses a mobile communication network in which an LTE network including an EUTRAN (Evolved Universal Terrestrial Radio Access Network) is interworked. In addition, the mobile communication terminal 100 may use a mobile communication network in which a WCDMA network including a UTRAN is interworked. For example, conventional mobile phones such as a cellular phone, a PCS phone, a GSM phone, a CDMA-2000 phone, a WCDMA phone, etc., and a mobile phone using a smart phone, tablet PC and 4G network, 100).

The private base stations 210 and 220 are located in a region of a macro-cell base station having a large radius or outside a region of a macro-cell base station, and provide a specific communication service with coverage for a small number of subscribers. Specifically, the private base stations 210 and 220 are connected to a mobile communication core network (EPC) using a digital subscriber line (DSL) and a public network such as Ethernet, . The private base stations 210 and 220 form a local bearer with the private gateway 300 and transmit and receive packets through the local bearer. Particularly, the private base stations 210 and 220 check the destination of the packet transmitted from the mobile communication terminal 100 and transmit the packet to the mobile communication terminal 100 when the destination of the packet is a terminal or a server belonging to the private network 400. [ Provides the local breakout function to route the packet directly to the private gateway 300.

The private base stations 210 and 220 may be used in various terms such as a femto base station, a micro base station, a pico base station, a Ubicell base station, and a 3GPP standard term HeNodeB. 210, and 220 are all connected to the core network of the mobile communication system through the general-purpose Internet line to provide the mobile communication terminal 100 with a communication service. In particular, according to the present invention, the private base stations 210 and 220 perform seamless handover in cooperation with the private gateway 300, which will be described in detail with reference to FIG. 2 to FIG.

The EPC 600 is a core network in an LTE mobile communication network, and the EPC 600 includes various entities. A Serving Gateway (SGW) 620 for managing mobility; a PDN Gateway (hereinafter referred to as a PDW Gateway) which connects the mobile communication terminal 100 with the external PDN 500 and provides an IP routing and forwarding function; ) 630 and entities such as a user authentication and a mobility management entity (MME) 610 for managing the mobility of the mobile communication terminal 100 in the control plane entity in the EUTRAN are connected to the EPC 600 .

The MME 610 provides mobility management and session management functions of the mobile communication terminal 100 through an EUTRAN (Evolved Universal Terrestrial Radio Access Network) to a control plane entity and NAS (Non Access Stratum) signaling. In addition, the MME 610 manages the mobility state of the subscriber. For example, the MME 610 manages which communication network the mobile communication terminal 100 is currently connected to, the idle state, do.

The SGW 620 manages the mobility of the mobile communication terminal 100 between the base station and other base stations and between the 3GPP network and the EUTRAN and performs a session control function for processing payload traffic according to a set session . That is, the SGW 620 operates as an anchoring point when inter-base station handover and inter-3GPP inter-system handover are performed.

The PGW 630 connects the mobile communication terminal 100 to the PDN 500, provides an IP routing and forwarding function, and provides packet filtering. In addition, the PGW 630 allocates an IP address of the mobile communication terminal 100 and operates at a mobility anchoring point upon handover between SGWs or handover between an LTE communication system and a non-3GPP network (for example, WiMax, etc.) do.

The PDN 500 includes, for example, the Internet or the like. In this case, the Internet is used for various services existing in the upper layer of the TCP / IP protocol, that is, HyperText Transfer Protocol (HTTP), Telnet, File Transfer Protocol (DNS), Domain Name System (DNS), Simple Mail Transfer Protocol (NFS), Network Information Service (NIS), and so on.

The private gateway 300 performs a gateway function when the mobile communication terminal 100 performs communication with the private network 400. The uplink packet data transmitted from the mobile communication terminal 100 to the private network 400 and the downlink packet data transmitted from the private network 400 to the mobile communication terminal 100 are transmitted through the private gateway 300 . In particular, according to the present invention, the private gateway 300 performs seamless handover to data routed according to the local breakout function in cooperation with the private base stations 210 and 220.

The private gateway 300 identifies a local bearer (i.e., a source local bearer) previously formed with the mobile communication terminal 100 using specific information according to the type of handover. In this case, the private gateway 300 does not use the International Mobile Subscriber Identity (IMSI) of the mobile communication terminal 100 that is subjected to encryption processing on the network, but uses the MME UE S1AP ID and the GUMMEI (Globally Unique MME Identifier) And identifies a local bearer formed with the source base station using a Physical Cell ID (PCI) and a Cell-Radio Network Temporary Identifier (C-RNTI).

The private network 400 is a local network such as a company or a home. For example, the private network 400 may be a LAN (Local Area Network) or the like. The private network 400 is connected to an external Internet network via Ethernet.

2 to 4, when a handover is in progress, a base station serving as a source base station is a first private base station 210, and a base station serving as a target base station is a second private base station 220 .

2 is a flowchart illustrating a method of forming a local bearer with a mobile communication terminal in a private network system according to an embodiment of the present invention.

Referring to FIG. 2, the mobile communication terminal 100 establishes an ECM (EPS Connection Management) connection to use an EPS (Evolved Packet System), and performs authentication and security processes to access an E-RAB (EUTRAN Radio Access Bearer) . Since these processes are a general process in the service request of the mobile communication terminal 100, only a brief description will be given below.

First, an ECM connection establishment process is performed (S201). In this process, the mobile communication terminal 100 establishes an ECM connection by transmitting a Service Request message to the MME 610. The service request message is transmitted to the first private base station 210 through the RRC Connection Setup message on the radio link between the mobile communication terminal 100 and the first private base station 210 and is transmitted to the first private base station 210- 610 are transmitted to the MME 610 through an Initial UE Message, which is an S1AP message.

The authentication and security process is then performed (S203). This process authenticates the subscriber between the mobile communication terminal 100, the MME 610, and the HSS (not shown in the figure) (610) to the NAS Security Keys to be used for the NAS signaling message communication through the NAS Security Setup procedure. The HSS is a home subscriber server that stores subscriber information.

In step S205, the MME 610 receiving the Service Request message from the mobile communication terminal 100 transmits a DRB (Data Radio Bearer) message to the first private base station 210, And the S1 bearer.

The DRB in the interval between the mobile communication terminal 100 and the first private base station 210 and the S1 bearer in the interval between the first private base station 210 and the SGW 620 and the SGW 620 to the PGW 630 The mobile communication terminal 100 can use packet data communication with the EPC 600 through the bearers.

In particular, according to the present invention, the mobile communication terminal 100 needs a process of activating a local bearer with the private gateway 300 in order to perform packet data communication with the private network 400, which will be described.

The first private base station 210 transmits a connection request message to the private gateway 300 (S209). The message includes the IMSI of the mobile communication terminal 100, the TEID of the first private base station 210, the Globally Unique MME Identifier (GUMMEI), the MME UE S1AP ID, the PCI, and the C-RNTI. The PCI (Physical Cell ID) and the C-RNTI (Cell-Radio Network Temporary Identifier) are values assigned by the first private base station 210. The PCI is the cell identification information of the mobile communication terminal 100, -RNTI is provisionally assigned identification information allocated to distinguish the mobile communication terminal 100 from the first private base station 210. [ The TEID is identification information on a GTP tunnel that is a local bearer in the interval between the first private BS 210 and the private gateway 300 and is a TEID (Tunneling Endpoint ID) having the first private BS 210 as an end point . In addition, the MME UE S1AP ID is an identifier allocated by the MME 610 to identify the mobile communication terminal 100 on the S1 interface. When the MME 610 generates the MME UE S1AP ID, An MME UE S1AP ID is transmitted together with the S1 bearer to the first private base station 210, and the first private base station 210 stores the MME UE S1AP ID while the S1 bearer is maintained. The GUMMEI is identification information used to identify the MME 610,

The private gateway 300 receiving the connection request message maps and stores the IMSI of the mobile communication terminal 100, the TEID of the first private base station 210, the GUMMEI, the MME UE S1AP ID, the PCI and the C-RNTI , And authenticates the mobile communication terminal 100 (S211). That is, the private gateway 300 determines whether the subscriber is a subscriber who is able to access the private network 400. For example, the LEG 300 can perform subscriber authentication using the identification information of the mobile communication terminal 100.

If the authentication of the mobile communication terminal 100 is successful, the private gateway 300 transmits a response message for connection request to the first private gateway 300 (S213), and the message includes a session ID and a TEID .

In step S215, a DRB is formed in a period between the mobile communication terminal 100 and the first private base station 210, a local bearer is created in the first private base station 210 and the private gateway 300, , The mobile communication terminal 100 can transmit and receive packet data to the private network 400 through the bearer.

The uplink packet data generated from the mobile communication terminal 100 is transmitted from the mobile communication terminal 100 to the first private base station 210 (S217).

The first private base station 210 analyzes the packet data and analyzes which node is the destination (S219). For example, the first private base station 210 analyzes the destination address or the APN of the corresponding packet data to determine whether the packet data is directed to the general PDN 500 or the private network 400 It can be judged. Specifically, when the destination address of the packet data is included in the IP address band, the first private base station 210 refers to the IP address band of the private network 400 being stored in advance and judges that it is directed to the private network 400 Otherwise, it can be determined that it is directed to the general PDN 500. [

As a result of the determination, the first private base station 210 routes the packet data to the S1 bearer in the case of packet data destined for the general PDN 500, and routes the packet data to the local bearer in case of packet data destined for the private network 400 S221).

3 is a flowchart illustrating a method of processing an X2 handover of a mobile communication terminal in a private network system according to an embodiment of the present invention.

3, the first private base station 210 periodically receives a measurement report message from the mobile communication terminal 100 and transmits a radio signal of the peripheral base stations 210 and 220 included in the measurement report Check the strength. When the strength of the radio signal of the second private base station 220 is stronger than the threshold value, the first private base station 210 transmits the measurement report to the second private base station 220 It is determined to be the target base station to be handed over (S301). At this time, the first private base station determines to perform the X2 handover. The criterion for determining whether to proceed to either the X2 handover or the S1 handover is determined by considering the option value set in the private base station, the overload of the target base station, the bearer connection state, The handover type can be determined.

In step S303, the first private base station 210 transmits a handover request message to the second private base station 220, which is the target base station, by determining to perform the X2 based handover. The handover request message includes the MME UE S1AP ID used by the first private base station 210 to form the S 1 bearer with the SGW 620.

Next, the second private base station 220 forms an S1 bearer with the SGW 620 (S305). The S1 bearer routes the uplink packet, which is a unidirectional packet, until the handover is completed. Then, the second private base station 220 establishes an X2 bearer with the first private base station 210 (S307). The X2 bearer routes the uplink packet, which is a unidirectional packet, until the handover is completed.

In step S309, the RRC connection reconfiguration message is transmitted to the mobile communication terminal 100 to request reconfiguration of the RRC connection with the first private base station 210. That is, the first private base station 210 requests the mobile communication terminal 100 to form a radio link with the second private base station 220. The message includes identification information of a second private base station 220, which is a target base station.

Then, the mobile communication terminal 100 releases the DRB with the first private base station 210 and forms a DBR with the second private base station 220 (S311, S313).

Accordingly, until the X2 handover is completed, the download traffic is transmitted from the PGW 630 to the SGW 620, the first private base station 210, the second private base station 220, and the mobile communication terminal 100 ). ≪ / RTI > Also, until the X2 handover is completed, the upload traffic flows to the path of the mobile communication terminal 100 -> the second private base station 220 -> the SGW 620 -> the PGW 630.

The second private base station 220 forming the DBR with the mobile communication terminal 100 transmits a Path Switch Request to the SGW 620 to request the path switching to the MME 610 at step S315. At this time, the second private base station 220 includes the MME UE S1AP ID (i.e., the source MME UE S1AP ID) received from the first private base station 210 in step S303.

The MME 610 generates the downlink S1 bearer in cooperation with the SGW 620 and transmits the download traffic direction to the mobile communication terminal 100 from the first private base station 210 to the second private base station 220, (S319). Based on the MME UE S1AP ID, the MME 610 identifies the S1 bearer, which is a dedicated bearer of the mobile communication terminal 100 formed with the first private base station 210, and releases the S1 bearer. Accordingly, a DBR is formed between the mobile communication terminal 100 and the second private base station 220, and an S1 bearer is formed between the second private base station 220, the MME 610 and the SGW 620.

In addition, the second private base station 220 forms an uplink S1 bearer with the MME 610, thereby releasing the X2 bearer formed with the first private base station 210 (S321).

After completing the X2 handover with the EPC 600, the second private base station 220 proceeds handover of the local bearer. That is, the second private base station 220 transmits a message requesting a change of the local path (Local Path Switch Request) to the private gateway 300 (S323). At this time, the second private base station 220 includes the MME UE S1AP ID (i.e., the source MME UE S1AP ID) and the GUMMEI received from the first private base station 210 in step S303, (Type = X2) indicating the X2 handover to the message.

Then, the private gateway 300 has tunnel identification information, and forms a local bearer for handover with the second private base station 220 (S325). Then, the private gateway 300 recognizes that the X2 handover between the first private BS 210 and the second private BS 220 proceeds according to the handover type information X2 included in the message. Then, based on the MME UE S1AP ID and GUMMEI, the private gateway 300 selects a local bearer dedicated to the mobile communication terminal 100 formed with the first private base station 210 among the local bearers formed with each base station (S327). At this time, the private gateway 300 identifies the tunnel identification information mapped to the MME UE S1AP ID and GUMMEI, and identifies the local bearer having the tunnel identification information as a local bearer dedicated to the mobile communication terminal 100 .

After the local bearer is identified, the private gateway 300 releases the identified local bearer (S329). When this process is completed, a DRB is formed between the mobile communication terminal 100 and the second private base station 220 A new local bearer is formed between the second private base station 220 and the private gateway 300. Even during the handover, packets transmitted to the private network 400 are seamlessly transmitted to the private gateway 300 through the new bearer , The private gateway 300 routes the packet to the private network 400.

Also, the second private base station 220 can transmit the IMSI of the mobile communication terminal 100, the TEID, GUMMEI, MME UE S1AP ID, PCI, and C-RNTI formed between the second private base station 220 and the private gateway 300 The private gateway 300 transmits the IMSI of the mobile communication terminal 100 received from the second private base station 220, the TEID of the second private base station 220, the GUMMEI, the MME UE S1AP ID, PCI, and C-RNTI, and uses the stored information at the next handover of the mobile communication terminal 100. [

4 is a flowchart illustrating a method of handling S1 handover of a mobile communication terminal according to another embodiment of the present invention.

4, the first private base station 210 periodically receives a measurement report message from the mobile communication terminal 100 and transmits a radio signal of the peripheral base stations 210 and 220 included in the measurement report Check the strength. When the strength of the radio signal of the second private base station 220 is stronger than the threshold value, the first private base station 210 transmits the measurement report to the second private base station 220 It is determined to be the target base station to be handed over (S401). At this time, the first private base station can decide to perform S1 handover.

In step S403, the first private base station 210 transmits a Handover Request message to the MME 610 in response to the decision that the S1-based handover is to be performed. The handover request message includes the PCI and C-RNTIs used by the first private BS 210 to form the S1 bearer with the SGW 620 and the identification information of the second private BS 220 that is the target BS.

Then, the MME 610 transmits a Handover Request message including the PCI and C-RNTI to the second private base station 220 (S405).

Then, the second private base station 220 forms an S1 bearer used for routing the uplink packet in cooperation with the MME 610 and the SGW 620 (S407). Next, the second private base station 220 transmits a handover request acknowledgment (Handover Request Ack) to the MME 610 (S409), and the MME 610 requests tunnel creation (Create Indirect Data Forwarding Tunnel Request) to the SGW 620 (S411).

Then, the SGW 620 forms a tunnel (Indirect Forwarding Tunnel) used as a path through which the downlink packet is bypassed to the second private base station 220 (S413). Next, the SGW 620 transmits a Create Indirect Data Forwarding Tunnel Response to the MME 610 indicating that the tunnel used as the detour route is completed (S415).

Then, the MME 610 transmits a handover command (Handover Command) to the first private base station 210 (S417). Then, the first private base station 210 transmits a RRC Connection Reconfiguration (RRC Connection Reconfiguration) message to the mobile communication terminal 100 (S419). That is, the first private base station 210 requests the mobile communication terminal 100 to form a radio link with the second private base station 220. The message includes identification information of a second private base station 220, which is a target base station.

Then, the mobile communication terminal 100 releases the DRB with the first private base station 210 and forms a DBR with the second private base station 220 (S421, S423).

Accordingly, until the S1 handover is completed, the download traffic is transmitted from the PGW 630 SGW 620, the first private BS 210, the SGW 620, the second private BS 220, > To the path of the mobile communication terminal 100. Also, until the S1 handover is completed, the upload traffic flows to the path of the mobile communication terminal 100 -> the second private base station 220 -> the SGW 620 -> the PGW 630.

When the second private base station 220 forms a DRB with the mobile communication terminal 100, the second private base station 220 transmits a message (Handover Notify) indicating that the DRB of the mobile communication terminal 100 has been formed to the MME 610 (S425) . Then, the MME 610, in cooperation with the SGW 620, forms an S1 bearer to be used for the downlink with the second private base station 220. As the S1 bearer dedicated to the uplink is already generated in step S407, The S1 bearer used for the uplink and the downlink is completed between the second private base station 220 and the second private base station 220 and between the second private base station 220 and the mobile communication terminal 100, (S427).

The second private base station 220 releases the tunnel (i.e., Indirect Forwarding Tunnel) used as the detour path formed with the SGW 620 in step S429, and the SGW 620 in the first private base station 210, And releases the formed S1 bearer (S431).

After completing the S1 handover with the EPC 600, the second private base station 220 proceeds handover of the local bearer. That is, the second private base station 220 transmits a message requesting a change of the local path (Local Path Switch Request) to the private gateway 300 (S433). At this time, the second private base station 220 records the PCI and the C-RNTI received from the first private base station in step S, and also records information (type = S1) indicating S1 handover in the message type .

Then, the private gateway 300 forms a local bearer having unique tunnel identification information (TEID) with the second private base station 220 (S435). Then, the private gateway 300 recognizes that the S1 handover between the first private BS 210 and the second private BS 220 proceeds as the S1 handover information is recorded in the message. Then, the private gateway 300 identifies a local bearer dedicated to the mobile communication terminal 100 formed with the first private base station 210 among the local bearers formed with the respective base stations based on the PCI and C-RNTIs (S437). At this time, the private gateway 300 can identify a local bearer dedicated to the mobile communication terminal 100 formed with the first private base station 210 based on the tunnel identification information mapped with the PCI and the C-RNTI.

Then, the private gateway 300 releases the identified local bearer (S430). When this process is completed, a DRB is formed between the mobile communication terminal 100 and the second private base station 220, a new local bearer is formed between the second private base station 220 and the private gateway 300, The packet transmitted to the private network 400 is seamlessly transmitted to the private gateway 300 through the new bearer and the private gateway 300 routes the packet to the private network 400.

Also, the second private base station 220 transmits the TEID, GUMMEI, MME UE S1AP ID, and the existing PCI (Personal Identification Number) of the local bearer formed with the IMSI of the mobile communication terminal 100, the second private base station 220 and the private gateway 300, The private gateway 300 transmits the IMSI, the TEID, the MME UE, and the C-RNTI of the mobile communication terminal 100, which are received from the second private base station 220, to the private gateway 300, S1AP ID, PCI, and C-RNTI, and uses the stored information for the next handover of the mobile communication terminal 100. [

Meanwhile, in the above-described embodiment, although the private gateway 300 has been described as using the GUMMEI and the MME UE S1AP IDs to identify the X2 handover-over local hub, the private gateway 300 handles the S1 handover As always, you can also use the PCI and C-RNTIs to identify the local hubs that have been X2 handed over.

As described above, in the private network system according to the present invention, when the mobile communication terminal 100 is handed over in the private network, not only the handover of the public network data but also the private network data generated through the local break- Performs handover, and provides seamless data service to the mobile communication terminal 100. In addition, the private network system according to the present invention complies with the 3GPP standard for EPC, and the functions of the private gateway 300 and the private base stations 210 and 220 are added to the private network without affecting the existing public network. And performs smooth handover to data transmitted and received.

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.

100: mobile communication terminal 210, 220: private base station
300: private gateway 400: private network
500: PDN 600: EPC
610: MME 620: SGW
630: PGW

Claims (10)

A first S1 bearer with an Evolved Packet Core-network (EPC), relaying a packet of a mobile communication terminal transmitted to the public network through the first S1 bearer, forming a first local bearer with a private gateway, A first private base station relaying a packet of the mobile communication terminal transmitted through a local bearer to a private network;
When the handover of the mobile communication terminal proceeds, the serving base station forms a second S1 bearer with the EPC, processes a packet of a mobile communication terminal transmitted to the public network through the second S1 bearer, A second private base station releasing the first S1 bearer formed between the first private base station and the EPC; And
Receiving a local path change message from the second private base station to generate a second local bearer and a second local bearer to change the traffic direction of the first local bearer to the second local bearer, And a private gateway for identifying the first local bearer based on the information included in the first local bearer and releasing the first local bearer,
The private gateway comprises:
MME UE S1AP identification information, GUMMEI (Globally Unique MME Identifier), PCI (Physical Cell ID), and C-RNTI (Cell ID) information from the first private BS forming the first local bearer. And receiving and storing the random network temporary identifier. The method according to claim 1,
The private gateway comprises:
Extracts a PCI (Physical Cell ID) and a C-RNTI (Cell-Radio Network Temporary Identifier) included in the local path change message, and identifies the first local bearer based on the PCI and C-RNTI Private network system. 3. The method of claim 2,
The private gateway comprises:
And identifies the first local bearer based on the PCI and the C-RNTI when the S1 handover is performed between the first private base station and the second private base station. 4. The method according to any one of claims 1 to 3,
The private gateway comprises:
When the X2 handover is performed between the first private base station and the second private base station, the first local bearer based on the MME UE S1AP identification information included in the local path change message and the Globally Unique MME Identifier (GUMMEI) Wherein the identification of the private network system comprises: delete A method for handling seamless handover of private network data in a private network system,
Determining a handover from a source private base station to a target private base station;
The target private base station forming an EPC (Evolved Packet Core-network) and a target S 1 bearer, and changing traffic for the public network to the target S 1 bearer;
Receiving a local path change message from the target private base station;
The private gateway creating target local bearers with the target private base station and changing traffic for the private network to the target local bearer; And
The private gateway identifying a source local bearer formed with the source private base station based on the information included in the local path change message and releasing the identified source local bearer,
Before the step of determining handover,
Wherein the private gateway comprises: tunnel identification information of a local bearer formed with the source private base station, MME UE S1AP identification information, Globally Unique MME Identifier (GUMMEI), Physical Cell ID (PCI), and Cell-Radio Network Temporary Identifier ) From the source private base station and storing the received data. The method according to claim 6,
Wherein releasing the source local bearer comprises:
Extracting a PCI (Physical Cell ID) and a C-RNTI (Cell-Radio Network Temporary Identifier) included in the local path switching message; And
And the private gateway identifies the source local bearer based on the extracted PCI and C-RNTI. 8. The method of claim 7,
Wherein the private gateway identifies the source local bearer based on the PCI and the C-RNTI when the S1 handover is performed between the source private base station and the target private base station. 9. The method according to any one of claims 6 to 8,
Wherein releasing the source local bearer comprises:
Extracting a MME UE S1AP identification information and a GUMMEI (Globally Unique MME Identifier) included in the local path change message when the private gateway performs an X2 handover between the source private base station and the target private base station; And
And the private gateway identifies the source local bearer based on the MME UE S1AP identification information and the GUMMEI. delete

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