WO2012138099A2 - 이동통신 네트워크 내에서 제어 평면을 담당하는 서버 및그 서버에서 트래픽 우회 서비스 이동성 지원 방법 - Google Patents
이동통신 네트워크 내에서 제어 평면을 담당하는 서버 및그 서버에서 트래픽 우회 서비스 이동성 지원 방법 Download PDFInfo
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- WO2012138099A2 WO2012138099A2 PCT/KR2012/002491 KR2012002491W WO2012138099A2 WO 2012138099 A2 WO2012138099 A2 WO 2012138099A2 KR 2012002491 W KR2012002491 W KR 2012002491W WO 2012138099 A2 WO2012138099 A2 WO 2012138099A2
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- base station
- sipto
- nodeb
- handover
- source base
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- 238000000034 method Methods 0.000 title claims abstract description 77
- 238000010295 mobile communication Methods 0.000 title claims abstract description 22
- 230000009849 deactivation Effects 0.000 claims description 7
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- 238000004891 communication Methods 0.000 description 8
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
- H04W36/083—Reselecting an access point wherein at least one of the access points is a moving node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/12—Reselecting a serving backbone network switching or routing node
- H04W36/125—Reselecting a serving backbone network switching or routing node involving different types of service backbones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/08—Mobility data transfer
- H04W8/082—Mobility data transfer for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/16—Gateway arrangements
Definitions
- the present invention relates to a server in charge of a control plane in a mobile communication network and a method for supporting SIPTO service mobility in the server.
- the 3GPP which enacts the technical specifications of 3G mobile communication systems, has developed LTE / SAE as part of efforts to optimize and improve the performance of 3GPP technologies since late 2004 in order to respond to various forums and new technologies related to 4G mobile communication. Started research on Long Term Evolution / System Architecture Evolution technology.
- 3GPP SAE centered on 3GPP SA WG2
- 3GPP SA WG2 is a study on network technology aimed at determining network structure and supporting mobility between heterogeneous networks in parallel with LTE work of 3GPP TSG RAN.
- Recent important standardization issues of 3GPP Is one of. This is a work to develop a 3GPP system into a system supporting various radio access technologies based on IP, and has been aimed at an optimized packet-based system that minimizes transmission delay with improved data transmission capability.
- the SAE high-level reference model defined by 3GPP SA WG2 includes non-roaming cases and roaming cases in various scenarios. For details, see 3GPP Standard Documents TS 23.400a and TS. See 23.400b.
- the network structure diagram of FIG. 1 is a simple reconfiguration.
- 1 is a structural diagram of an evolved mobile communication network.
- the network architecture of FIG. 1 is based on the eNodeB of Evolved UTRAN and the 2 Tier Model of Gateway of Core Network.
- the eNodeB 20 includes the functions of the NodeB and the RNC of the existing UMTS system, and the gateway may be regarded as having the SGSN / GGSN function of the existing system.
- the GW is a serving gateway (hereinafter referred to as 'S-GW') 52 and a packet data network gateway (hereinafter referred to as 'PDN-GW' or 'P-GW'). There is 53.
- 'S-GW' serving gateway
- 'PDN-GW' packet data network gateway
- FIG. 2 is a diagram illustrating a relationship between (e) NodeB and Home (e) NodeB.
- femto base stations such as Home (e) NodeB (30) have been proposed in the approach of increasing cell capacity using such small cells.
- the Home (e) Node (30) has been started to focus on the RAN WG3 of the 3GPP Home (e) NodeB, and has recently been studied in earnest in the SA WG.
- NodeB 20 shown in FIG. 2 corresponds to a macro base station
- Home (e) NodeB 30 shown in FIG. 2 may be a femto base station.
- NodeB is used when referring to NodeB or eNodeB together.
- Home (e) NodeB is used to refer to Home NodeB and Home eNodeB together.
- the interface shown in dashed lines is for transmitting control signals between (e) NodeB 20 and Home (e) NodeB 30 and the MME 510.
- the interface shown in solid lines is for the transmission of data in the user plane.
- traffic is overloaded or congested at the interface between the (e) NodeB 20 and the S-GW 52, or the Home (e) NodeB 30 is connected to the (e) NodeB 30.
- traffic is overloaded or congested on the interface between the S-GWs 52, downlink data to the UE 10 or upload data from the UE 10 may fail to be transmitted correctly.
- an interface between the S-GW 52 and the PDN-GW 53 or an interface between the PDN-GW 53 and an IP (Internet Protocol) service network of a mobile communication operator may be overloaded or congested. Even in the case of congestion, downlink data to the UE 10 or upload data from the UE 10 may fail to be transmitted correctly.
- IP Internet Protocol
- a specific IP traffic (eg, Internet service) of the UE is selected and transmitted in an optimal path in a macro access network, and in the femto access network (eg, Home (e) NB), the mobile communication network.
- the SIPTO has been proposed to bypass selected paths through the nodes of the public network, that is, the wired network, rather than the mobile communication network.
- EPS evolved packet system
- MME 51 MME 51
- S-GW 52 S-GW 52
- P-GW 53 P-GW 53
- Home e
- the selected IP traffic offload (SIPTO) technology does not pass specific IP traffic (eg, Internet service) of the UE 10 via nodes in the IP service network 60 of the mobile operator, Bypass the nodes of 70).
- IP traffic eg, Internet service
- the UE 10 when the UE 10 is authorized to access the (e) NodeB 20, the UE 10 passes through the wired network 70 such as a public communication network through the (e) NodeB 20.
- the wired network 70 such as a public communication network through the (e) NodeB 20.
- a session can be created and an IP network service can be performed through the session.
- the operator policy and subscription information may be considered.
- a gateway that is, a local gateway in charge of some of the functions of the GGSN in the case of UMTS or a local gateway in charge of some of the functions of the PDN (P-GW) in the case of EPS ( e) It may be used as installed in a position close to the NodeB (20).
- Such a local gateway is called a local GGSN or local P-GW.
- the function of local GGSN or local P-GW is similar to that of GGSN or P-GW.
- the SIPTO technology has proposed a concept of generating a session for offloading data of the UE to the (e) NodeB 20, i.e., the macro base station to a wired network such as a public communication network.
- this conventional SIPTO technology has a problem that mobility is not guaranteed. That is, when the terminal receives the SIPTO service and performs a handover from the source base station to the target base station, a problem occurs that the service is disconnected.
- the UE hands over to the Home (e) NodeB 30 while using the Internet by receiving the SIPTO service through the (e) NodeB 20, that is, the macro base station, the UE transmits and receives All data is lost, and the Internet browser of the terminal does not respond. Thus, the user experience is degraded.
- this prior art does not consider the movement of the UE. That is, the above-described prior art considers a situation in which the UE stays in a fixed position similarly to the wireless LAN technology.
- the UE may move frequently or far away as a mobile terminal. Therefore, there is a problem that it is impossible to provide a service to a terminal having a wide range of movement based on the above-described prior art.
- An object of the present invention is to solve the above-mentioned problem.
- an object of the present invention is to propose a technique for handover when a UE moves a session for data of a UE offloaded to a wired network such as a public communication network.
- an object of the present invention is to propose a mobility management method of a session for the detoured data.
- another object of the present invention is to after the data of the UE located in the coverage of the source base station, such as source (e) NodeB to the wired network, such as public communication network, after the UE is offloaded to the target base station, such as (e) When moving into the coverage of the NodeB, it is to propose a method for processing the session for the bypassed data as appropriate according to the radio capability of the target base station.
- the source base station such as source (e) NodeB
- the wired network such as public communication network
- the present disclosure provides a method for supporting mobility of a selected IP traffic offload (SIPTO) service in a server in charge of a control plane in a mobile communication network.
- the method includes receiving a handover request message to a target base station for a terminal provided with a SIPTO service by a source base station; Determining whether to deactivate the SIPTO service; Performing a procedure for releasing a public data network (PDN) connection for a SIPTO according to the determination; According to the determination, after the handover, the method may include transmitting a message including information for reactivating SIPTO to the terminal through the source base station.
- PDN public data network
- the source base station may be Home (e) NodeB, and the target base station may be (e) NodeB.
- the terminal may have received a SIPTO service from another (e) NodeB before receiving the SIPTO service from the source base station, and performed handover to the source base station.
- the message may correspond to any one of a handover command message, a bearer deactivation request message, and a Deactivate Bearer Request message.
- the method may further include the server transmitting a relocation request message or forward relocation request message including bearer context information excluding PDN information for the SIPTO service to a target mobility management entity (MME).
- MME target mobility management entity
- IP Traffic offload SIPTO
- the supporting method includes the steps of receiving, by the terminal, a message including information for reactivating SIPTO after handover from the source base station; Performing, by the terminal, handover from the source base station to a target base station;
- the terminal may include transmitting a PDN connection request message to the target base station based on the information.
- the source base station may be Home (e) NodeB, and the target base station may be (e) NodeB.
- the terminal may have received a SIPTO service from another (e) NodeB before receiving the SIPTO service from the source base station, and performed handover to the source base station.
- the message may correspond to any one of a handover command message, a bearer deactivation request message, and a Deactivate Bearer Request message.
- the method may further include determining, based on the information, whether to reactivate the SIPTO service after handover.
- the present disclosure also provides a server that is in charge of the control plane in the mobile communication network to ensure mobility of the selected IP Traffic offload (SIPTO) service.
- the server includes a receiving unit for receiving a handover request message to a target base station for a terminal receiving a SIPTO service by a source base station; A controller for determining whether to deactivate the SIPTO service; Performing a procedure for releasing a PDN (Public Data Network) connection for a SIPTO according to the determination of the controller, and receiving a message including information for reactivating the SIPTO after handover according to the determination It may include a transmitter for transmitting to the terminal through.
- PDN Public Data Network
- the source base station may be Home (e) NodeB, and the target base station may be (e) NodeB.
- the terminal may have received a SIPTO service from another (e) NodeB before receiving the SIPTO service from the source base station, and performed handover to the source base station.
- the present specification also provides a terminal receiving a SIPTO (Selected IP Traffic offload) service from the source base station.
- SIPTO Select IP Traffic offload
- the terminal includes a receiving unit; A transmitter; And controlling the receiving unit and the transmitting unit to receive a message including information for reactivating SIPTO after handover from the source base station, performing a handover from the source base station to the target base station, and receiving the information.
- the controller may include a controller for transmitting a PDN connection request message to the target base station.
- an Internet service when supporting a Home (e) NodeB in a 3GPP EPS system, an Internet service may be connected to a public network without going through an Operator network through a Home (e) NodeB.
- the present invention also provides mobility management of a session bypassed to the public network.
- 1 is a structural diagram of an evolved mobile communication network.
- FIG. 2 is a diagram illustrating a relationship between (e) NodeB and Home (e) NodeB.
- FIG. 5 is an exemplary diagram illustrating a process in which the UE 100 hands over from (e) NodeB 200a to Home (e) NodeB 300b.
- FIG. 6 shows an example of a handover process.
- FIG. 7 is a diagram illustrating another process of UE 100 handing over from (e) NodeB 200a to Home (e) NodeB 300b.
- FIG 9 illustrates a process in which the UE 100 performs a handover from (e) NodeB 200a to Home (e) NodeB 300b and back to (e) NodeB 200c.
- FIG. 10 is an exemplary view showing a flowchart according to the first scheme.
- FIG. 11 is an exemplary view showing a flowchart according to a modification of the first scheme.
- FIG. 12 is an exemplary view showing a flowchart according to the second scheme.
- FIG. 13 exemplarily shows a protocol of the message shown in FIG.
- FIG. 14 is a configuration block diagram of the UE 100 and the MME 510 according to the present invention.
- the present invention is described based on the Universal Mobile Telecommunication System (UMTS) and the Evolved Packet Core (EPC), the present invention is not limited to such a communication system, but also to all communication systems and methods to which the technical spirit of the present invention can be applied. Can be applied.
- UMTS Universal Mobile Telecommunication System
- EPC Evolved Packet Core
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- a user equipment UE
- the illustrated UE may be referred to in terms of terminal, mobile equipment (ME), and the like.
- the UE may be a portable device such as a laptop, a mobile phone, a PDA, a smart phone, a multimedia device, or a non-portable device such as a PC or a vehicle-mounted device.
- UMTS Abbreviation for Universal Mobile Telecommunication System, which means the third generation mobile communication network.
- EPS stands for Evolved Packet System and means a core network supporting a Long Term Evolution (LTE) network.
- LTE Long Term Evolution
- UMTS evolved network
- PDN Public Data Network
- Independent network where the server that provides the service is located
- APN Access Point Name: A name of an access point managed in a network, which is provided to a UE. That is, the name (string) of the PDN. Based on the name of the access point, the corresponding PDN for the transmission and reception of data is determined.
- Access control A control procedure that allows an access system such as Home (e) NodeB to use a UE or moves to another access system.
- Tunnel Endpoint Identifier End point ID of a tunnel established between nodes in a network, and is set for each section in bearer units of each UE.
- NodeB A base station of a UMTS network, which is installed outdoors, and a cell coverage scale corresponds to a macro cell.
- eNodeB A base station of an evolved packet system (EPS), which is installed outdoors, and a cell coverage size corresponds to a macro cell.
- EPS evolved packet system
- NodeB A term referring to NodeB and eNodeB.
- Home NodeB A base station of a UMTS network, which is installed indoors and its cell coverage corresponds to a femto cell.
- Home eNodeB Base station of EPS network installed indoors and cell coverage is femto cell.
- NodeB It refers to the Home NodeB and Home eNodeB.
- NodeB Gateway A gateway that connects to one or more Home (e) NodeBs and interfaces with the core network.
- Home (e) NodeB Subsystem It manages wireless network by combining Home (e) NodeB and Home (e) NodeB Gateway into one set.
- the Home (e) NodeB Subsystem and the Home (e) NodeB both manage wireless networks and interoperate with the core network, so they can be thought of as an aggregate. Therefore, hereinafter, the terms Home (e) NodeB and Home (e) NodeB subsystem are used interchangeably.
- MME Mobility Management Entity
- CSG Closed Subscriber Group
- e NodeBs
- e NodeBs belonging to a CSG have the same CSG ID.
- Each user is licensed by CSG.
- NodeB operates as a CSG cell. It refers to operating in a manner that allows access to only user terminals allowed in the cell. That is, only a terminal having authority for specific CSG IDs supported by Home (e) NodeB can be accessed.
- NodeB operates in the same way as a normal cell (normal cell, non-CSG cell) without the concept of CSG. That is, it works like a normal (e) NodeB.
- Hybrid access mode Home (e) NodeB operates as a CSG cell, but allows access to non-CSG subscribers. It is possible to provide a Home (e) NodeB service by allowing access to a user terminal having a specific CSG ID that can be supported in a corresponding cell, and the UE without CSG authority operates in a manner that allows access.
- SIPTO Selected IP Traffic Offload
- SIPTO refers to an optimal path selection method in a macro cell, and a method of bypassing a fixed network in a femtocell without passing through a carrier's core network. That is, it has a purpose to transmit data by minimizing a path in a wireless network.
- the important point is that control of these operations is performed through the core network.
- SIPTO femto A technology that when a UE transmits specific IP traffic through the Home (e) NodeB, bypasses the carrier's network (eg 3GPP, 3GPP2) to a wired network such as the Internet.
- the carrier's network eg 3GPP, 3GPP2
- SIPTO macro a technology that when a UE sends specific IP traffic through (e) NodeB, bypasses the mobile operator's network (eg 3GPP, 3GPP2) to a wired network such as the Internet
- LIPA Local IP Access
- a gateway for enabling LIPA or SIPTO through the Home (e) NodeB that is, enabling data transmission to a home network or a direct wired network without passing through a core network.
- the local gateway is located between the Home (e) NodeB and the wired network, create a bearer between the Home (e) NodeB and the wired network, or to create a bearer between the Home (e) NodeB and the local network, Enable data transmission through the created bearer.
- a session is a channel for data transmission.
- the unit may be a PDN, a bearer, or an IP flow unit.
- the difference in each unit can be divided into the entire target network unit (APN or PDN unit), the QoS classification unit (Bearer unit), and the destination IP address unit as defined in 3GPP.
- PDN connection (connection) A connection from the terminal to the PDN, that is, the association (connection) between the terminal represented by the IP address and the PDN represented by the APN.
- UE Context Context information of UE used to manage UE in the network, ie Context Information composed of UE id, mobility (current location, etc.), session attributes (QoS, priority, etc.)
- Local PDN An independent individual network, such as a home or corporate network, that is not an external PDN.
- NodeB Network A network for accessing a local PDN and consists of Home (e) NodeB and L-GW.
- Local network A network containing a local Home (e) NodeB network and a local PDN.
- LIPA is a technology that provides PDN connectivity from the Home (e) NodeB to the local network
- SIPTO is divided into SIPTO macro (or macro SIPTO) and SIPTO femto (or femto SIPTO).
- the SIPTO macro refers to bypassing traffic of the terminal to a wired network such as a public network when the terminal accesses a macro cell
- SIPTO femto bypasses data of the terminal to a wired network such as a public network when the terminal accesses a femtocell. I say to let you.
- Rel-11 in the 3GPP standard discusses much about SIPTO femto.
- the LIPA service may be used as it is. That is, when applying the existing SIPTO function in the Home (e) NodeB subsystem, it deletes the existing PDN and sets up the LIPA PDN connection when the UE re-requests the same PDN.
- L-GW creates and manages LIPA PDN and SIPTO PDN connections to transmit data.
- the LIPA PDN connection is released before the handover, and when the handover is performed, only the information from which the PDN connection for the LIPA is removed is delivered to the target MME.
- the SIPTO PDN connection releases the current SIPTO PDN at the MME's decision after TAU / RAU and requests the terminal to create a new SIPTO PDN connection.
- the terminal is a SIPTO service is performed through the femto cell, Home (e) NodeB, when the handover occurs to the macro cell, the SIPTO PDN connection is disconnected because it is connected to the L-GW.
- the SIPTO PDN connection follows the LIPA PDN connection creation method so that the target MME cannot know the information about the SIPTO PDN when moving.
- the method of re-requesting the UE at the time of TAU during or after handover requires a lot of modifications to the existing procedure.
- FIG. 5 is an exemplary diagram illustrating a process in which the UE 100 hands over from (e) NodeB 200a to Home (e) NodeB 300b.
- the EPS system includes a source base station 200a, a target base station 300b, an MME 510, an S-GW 520, and a P-GW 530.
- the source base station 200a may be (e) NodeB
- the target base station 300b may be Home (e) NodeB.
- the MME 510 is connected to the source base station 200a and the target base station 300b as shown.
- the P-GW 530 is connected to the mobile communication provider network 600.
- the system shown in FIG. 5 is based on EPS, but may be applied to 3GPP UMTS (Universal Mobile Telecommunication System).
- 3GPP UMTS Universal Mobile Telecommunication System
- both the control plane function of the MME 510 and the user plane function of the S-GW 520 may be performed in a Serving GPRS Support Node (SGSN).
- SGSN Serving GPRS Support Node
- the UE 100 When the UE 100 makes a service request to the source base station, that is, (e) NodeB 200b, SGSN or MME 510, which is a control entity in the core network, receives data of the requested service of the UE 100. It is determined whether it is possible to bypass the wired network 700. In this case, even through a wired network 700 such as the public network, an access point provided may be the same as the mobile communication network 600. That is, the APN (Access Point Name) indicating the name of the access point is used the same, and SIPTO authorization can be separately assigned to each APN.
- APN Access Point Name
- the UE 100 when the UE 100 attempts to connect, it provides a specific APN to an entity in the core network, and whether to bypass the connection of the UE 100 to nodes of the wired network 700 such as the public network. May be determined by an entity in the core network, for example, the MME 510 of the EPS or the Serving GPRS Support Node (SGSN) of the UMTS.
- the control entity in the core network for example, the MME 510 determines whether the base station to which the UE 100 is connected is the (e) NodeB or Home (e) NodeB, and whether the base station supports SIPTO. In consideration of this, it is possible to determine whether to bypass the data by the requested service to the wired network 700 such as the public network.
- the session for data of the service is set to be bypassed to the wired network 700 through the S-GW 520.
- a target base station 300b for example, Home (e) NodeB.
- the local gateway 400 is connected to the Home (e) NodeB 300b.
- the local gateway 400 is connected to the non-mobile communication network 700.
- the local gateway 400 is located between the Home (e) NodeB 300b and the wired network 700 and is a gateway for enabling SIPTO through the Home (e) NodeB 300b. That is, the local gateway 400 allows a session to be created through a path between the Home (e) NodeB 300b and the wired network 700 and enables data transmission through the generated bearer.
- the session of the UE 100 configured to pass through the wired network 700 in the source base station 200b, that is, (e) NodeB is not moved to the target base station 300b through seamless handover. You may not be able to.
- FIG. 6 shows an example of a handover process.
- the handover process illustrated in FIG. 6 is a procedure performed without changing the MME 510. 5, the MME 510 is connected to the source base station 200a and the target base station 300b as shown in the drawing. Thus, the UE 100 is connected to the target base station at the source base station 200a. Even if it moves to 300b, the MME 510 is not changed.
- the UE 100 is connected to the source base station, that is, (e) NodeB 200a.
- a SIPTO service is applied to the UE 100, and data of the UE is bypassed and transmitted to the wired network 700 shown in FIG. 5.
- the source base station 200a determines a handover and requests a handover (HO) to the MME 510 (HO required). ) Send a message.
- the MME 510 transmits a HO Request message to the target base station, that is, Home (e) NodeB 300b in response to the HO request.
- the target base station that is, the Home (e) NodeB 300b allocates radio resources in advance for the UE 100 and transmits a HO request response message, that is, a HO Request ACK message, to the MME 510.
- the HO request response message includes a handover command message, that is, a HO Command message.
- the MME 510 transmits the handover command message (ie, HO Command message) to the source base station, that is, (e) NodeB 200a.
- the source base station, that is, (e) NodeB 200a transmits a pre-handover command message (ie, HO Command message) to the UE 100.
- the UE 100 transmits a handover confirmation message, for example, a HO Confirm message, to the target base station, that is, Home (e) NodeB 300b, and the target base station, that is, Home (e) NodeB 300b, transmits a MME ( 510 sends a handover notification message, eg, a HO Notify message.
- a handover confirmation message for example, a HO Confirm message
- MME 510 sends a handover notification message, eg, a HO Notify message.
- the MME 510 transmits a UE context release command to the source base station 200a, and the source base station 200a releases radio resources. Subsequently, the source base station 200a transmits a UE context release complete message (UE context release complete message) to the MME 510.
- UE context release complete message UE context release complete message
- the UE 100 releases the PDN connection and reactivates the PDN connection. Should be.
- the HO command is received at the access stratum (AS) terminal of the UE 100, only the general handover is known. Since the management of PDN connection such as SIPTO is performed by the NAS (Non-Access Stratum), it is not known whether to release the existing PDN connection and reactivate the PDN connection. Accordingly, a situation in which the traffic of the UE 100 is disconnected after the handover occurs. In addition, the application of the UE 100, for example, a web browser, etc. repeats only retries, and a situation in which the operation does not occur.
- AS access stratum
- FIG. 7 is a diagram illustrating another process of UE 100 handing over from (e) NodeB 200a to Home (e) NodeB 300b.
- the source base station 200a that is, (e) NodeB 200a is connected to the source MME 510a and the source S-GW 520a.
- the source S-GW 520a is connected to the P-GW 530.
- the target base station, that is, the Home (e) NodeB 300b is connected to the source MME 510b and is also connected to the local P-GW 400b.
- the MME 510a which is a control entity in the core network, transmits data of the requested service of the UE 100 to the wired network. It is determined whether or not it can be bypassed at 700.
- the session for data of the service is set to be bypassed to the wired network 700 through the S-GW 520a.
- the session of the UE 100 configured to pass through the wired network 700 in the (e) NodeB 200a may not be moved to the Home (e) NodeB 300b through seamless handover. have.
- the source network includes a source base station, an eNodeB 200a, a source MME 510a, a source S-GW 520b, and a P-GW 530a.
- the target network may include a target base station, that is, a Home (e) NodeB 200b, a target MME 510b, a target S-GW 520b, and a P-GW 530b.
- the handover procedure shown in FIG. 8 is a procedure in which the EPC is transferred.
- the UE 100 is a source base station.
- a change procedure of the MME is performed.
- the UE 100 is connected to the source base station, that is, (e) NodeB 200a. And, the SIPTO service is applied to the UE 100, the data of the UE is bypassed and transmitted to the wired network 700 shown in FIG.
- the source base station 200a determines a handover and requests a handover (HO: Handover) to the source MME 510a. required) Send the message.
- HO Handover
- the source MME 510a determines a target MME 510b in response to the HO request.
- the source MME 510a transmits a previous request message, for example, a forward relocation request message, to the target MME 510b.
- the target MME 510b transmits a bearer creation request message, for example, a Create Bearer Request message, to the target S-GW 520b.
- the target S-GW 520b transmits a bearer creation response message, for example, a Create Bearer Response message, to the target MME 510b.
- the target MME 510b transmits a HO Request message to the target base station, that is, Home (e) NodeB 300b.
- the target base station that is, the Home (e) NodeB 300b allocates radio resources in advance for the UE 100 and transmits a HO request response message, that is, a HO Request ACK message, to the target MME 510b.
- the HO request response message includes a handover command message, that is, a HO Command message.
- the target MME 510b transmits a previous response message, such as a forward relocation response message, to the source MME 510a.
- the previous response message eg, Forward Relocation Response message
- the handover command message that is, a HO Command message.
- the source MME 510a transmits the handover command message (ie, HO Command message) to the source base station, that is, (e) NodeB 200a.
- the source base station (e) NodeB 200a transmits the handover command message (ie, HO Command message) to the UE 100.
- the UE 100 transmits a handover confirmation message, for example, a HO Confirm message, to the target base station, that is, Home (e) NodeB 300b, and the target base station, that is, Home (e) NodeB 300b, transmits the target MME.
- a handover notification message such as a HO Notify message
- the target MME 510b transmits a previous completion message, such as a Forward Relocation Complete message, to the source MME 510a, and the source MME 510a sends a previous completion response message, eg, a Forward Relocation Complete Ack message, to the target MME ( 510b).
- a previous completion message such as a Forward Relocation Complete message
- a previous completion response message eg, a Forward Relocation Complete Ack message
- the target MME 510b sends a bearer update request message, eg, an Update Bearer Request message, to the target S-GW 520b, and the target S-GW 520b sends a bearer update response message, eg, an Update Bearer Response message. Transmit to the target MME 510b.
- a bearer update request message eg, an Update Bearer Request message
- a bearer update response message eg, an Update Bearer Response message.
- the source MME 510a transmits a UE context release command to the source base station 200a, and the source base station 200a releases radio resources. Subsequently, the source base station 200a transmits a UE context release complete message (UE context release complete message) to the source MME 510a.
- UE context release complete message UE context release complete message
- the source MME 510a sends a bearer delete request message, for example, a Delete Bearer Request message, to the source S-GW 520b, and the source S-GW 520b sends a bearer delete response message, for example, a Delete Bearer Response message. Transmit to the source MME 510a.
- a bearer delete request message for example, a Delete Bearer Request message
- the source S-GW 520b sends a bearer delete response message, for example, a Delete Bearer Response message.
- the UE 100 releases the PDN connection and reactivates the PDN connection. Should be.
- the HO command command is received at the AS (Access Stratum) terminal of the UE 100, only the general handover is known. Since the management of PDN connection such as SIPTO is performed by the NAS (Non-Access Stratum), it is not known whether to release the existing PDN connection and reactivate the PDN connection. Accordingly, a situation in which the traffic of the UE 100 is disconnected after the handover occurs. In addition, the application of the UE 100, for example, a web browser, etc. repeats only retries, and a situation in which the operation does not occur.
- FIG 9 illustrates a process in which the UE 100 performs a handover from (e) NodeB 200a to Home (e) NodeB 300b and back to (e) NodeB 200c.
- the (e) NodeB 200a is connected to the MME 510a and the S-GW 520a.
- the S-GW 520a is connected to the P-GW 530.
- the Home (e) NodeB 300b is connected to the MME 510b and also to the local P-GW 400b.
- the (e) NodeB 200c is connected to the MME 510c and the S-GW 520c.
- the source MME 510a which is a control entity in the core network sends data of the requested service of the UE 100 to the wired network 700. It is judged whether or not it can be bypassed.
- the session for data of the service is set to be bypassed to the wired network 700 through the source S-GW 520a.
- a target base station 300b for example, Home (e) NodeB.
- the session of the UE 100 configured to pass through the wired network 700 in the source base station 200b, that is, (e) NodeB is not moved to the target base station 300b through seamless handover. You may not be able to.
- the MME 510b connected to the Home (e) NodeB 300b is connected to the UE 100.
- the session of the UE 100 to which the SIPTO service is applied may not be moved to (e) NodeB 200c through seamless handover. This may not be moved even if it moves to another Home (e) NodeB not connected to the local P-GW 400b.
- the terminal and the network support multiple PDN functions.
- SIPTO PDN connectivity is also provided by femto base stations, ie Home (e) NodeB.
- the method proposed herein is to implement the SIPTO femto function considering the mobility from the Home (e) NodeB to the macrocell.
- the Home (e) NodeB 300b the Home (e) NodeB 300b
- the source MME 510b connected to inform the UE 100 to reset the PDN connection after the handover.
- Home (e) NodeB (300b) as the source base station determines the handover and requests the handover to the source MME (510b).
- Home (e) NodeB (300b) as the source base station delivers the target TAI (ie, cell id) together.
- the source MME 510b checks whether the SIPTO PDN connection is activated (the PDN has SIPTO authorization information) to the terminal, whether the target base station is a macro base station, that is, (e) NodeB 200c, and (e) In the case of the NodeB 200c, the SIPTO PDN connection is deleted. In this case, the deletion may be determined in consideration of subscriber information, operator policy, local configuration, and the like.
- the source MME 510b After deleting the SIPTO PDN connection, the source MME 510b transmits a request message to the UE 100 to reset the PDN connection. At this time, the reset of the PDN connection is informed to perform after the handover. That is, after moving to the target base station instead of the current source base station, information such as information, an indicator, or a cause value is transmitted.
- the UE 100 determines the transmitted information after the handover, and requests the SIPTO PDN connection from the macro base station.
- the source M-GW 400b since the source L-GW 400b deletes the SIPTO PDN due to the handover, the source M-GW 400b informs the source MME 510b to regenerate the SIPTO PDN after the handover.
- the Home (e) NodeB (300b) as the source base station determines the handover and requests the source L-GW (400b) to delete the SIPTO PDN connection in consideration of the target TAI (cell id).
- the source L-GW 400b deletes the SIPTO PDN due to the handover, an indicator, a cause value, and the like that inform the UE 100 to regenerate the SIPTO PDN after the handover are included. To pass.
- the source L-GW 400b deletes the bearers to delete the SIPTO PDN connection, passing the above information to the source MME 510b requesting regeneration of the SIPTO PDN connection.
- the source MME 510b may inform the terminal of the request message to reestablish the PDN connection, and at this time, deliver a message to be performed after handover. That is, it transfers information to be done after the movement, not the current cell, an indicator, or a cause value.
- the UE 100 After performing the handover, the UE 100 determines based on the transmitted information and requests a SIPTO PDN connection from a macro base station, that is, a target base station (e) NodeB 300c.
- FIG. 10 is an exemplary view showing a flowchart according to the first scheme
- FIG. 13 shows an example of a protocol of a message shown in FIG. 10.
- Messages transmitted and received between the UE 100 and the source base station or target base station such as (e) NodeB 200 or Home (e) NodeB 300 are messages based on a radio resource control (RRC) protocol.
- Messages transmitted and received between the source base station or the target base station between the MME 510 are messages based on S1 Application Protocol (S1-AP).
- RRC radio resource control
- Messages transmitted and received between the UE 100 and the MME 510 or SGSN are messages by a non-access stratum (NAS) protocol.
- the messages by the NAS protocol are encapsulated and transmitted by the RRC protocol and the S1-AP message corresponding to the AS stratum protocol.
- a SIPTO based session is established.
- the UE 100 moves into coverage of (e) NodeB 200c which is a target base station.
- the target base station (e) NodeB 200c is connected to the illustrated target MME 510c and is also connected to other MMEs.
- the source MME 510b determines the appropriate responsible MME for the UE 100.
- the target MME 510c is determined as an appropriate responsible MME according to the determination.
- the source MME 510b may perform X2-based handover, S1-based handover, and Inter RAT handover to the target MME 510c. Request for forward relocation request, etc.
- the source MME (510b), if the charge MME is changed, deletes the PDN for the existing SIPTO, deactivates the SITPO to the UE (100) through the source base station Home (e) NodeB (300b) and hand Reminds you to reactivate after over.
- the source MME 510b (or SGSN) stores the result in the UE context.
- the UE context includes an MM / EPS Bearer context for mobility and session management.
- a parameter indicating whether the established session is a SIPTO based session for example, a SIPTO_Session_indicator is set.
- the source MME 510b (or SGSN) sets an indication indicating that the generated session is a SIPTO based session, for example, (SIPTO_Session_Indicator) in a UE context in units of PDN, bearer, or ip address, and another general session. Distinguish from
- the UE 100 moves geographically.
- the source base station that is, the source Home (e) NodeB 300b selects the target base station (e) NodeB 200c as a target to be handed over in consideration of the state of the base stations where the UE is located.
- the source base station that is, the source Home (e) NodeB 300b transmits a handover request message to the source MME 510b.
- the handover request message may be a Handover Rquired message based on the S1-AP protocol.
- the message may include the id of the target base station (e) NodeB 200c.
- the source MME 510b determines an appropriate responsible MME among several MMEs managing the target base station (e) NodeB 200c. Assume that the target MME 510c is determined as the responsible MME according to the determination.
- the source MME 510b determines whether to deactivate the SIPTO.
- the source MME 510b causes the source L-GW 400b to release the SIPTO PDN.
- the source MME 510b transmits a previous request message, for example, Forward Relocation Request message, to the target MME 510c.
- the source MME 510b delivers a UE context to the target MME 510c.
- the UE context includes an MM / EPS bearer context and the like. In this case, the information on the SIPTO PDN is excluded from the information included in the bearer context.
- the target MME 510c determines the responsible S-GW or P-GW.
- the target MME 510c selects the target P-GW 530c, it transmits a bearer creation request message, for example, a Create Bearer Request message, and the target P-GW 530c sends a bearer to the target MME 510c. Send a creation response message.
- a bearer creation request message for example, a Create Bearer Request message
- the target MME 510c When the target MME 510c receives the bearer creation response message or bearer creation complete message, the target MME 510c sends a hand to inform the target base station (e) NodeB 200c to prepare for handover.
- Send an over request message eg a Handover Request message.
- the handover request message includes an EPS Bearer to Setup parameter.
- the EPS Bearer to Setup parameter includes only general session information passing through the core network.
- the target base station (e) NodeB 200c transmits a response message, for example, a Handover Request Ack message, to the target MME 510c.
- the response message, eg, Handover Request Ack message includes a handover command message, eg, Handover command message.
- the target MME 510c sends a previous response message, such as a Forward Relocation Response message, to the source MME 510b.
- the previous response message for example, Forward Relocation Response message may further include an EPS Bearer to Setup parameter.
- the EPS Bearer to Setup includes only information on general sessions going through the core network.
- the source MME 510b When the source MME 510b receives the previous response message, the source MME 510b transmits a handover command, eg, a Handover Command message, to the UE 100 through a source base station, that is, a source Home (e) NodeB 300b.
- the Handover Command message may include information or an indicator for reactivating the SIPTO after the handover, for example, Reactivation of SIPTO.
- the reactivation of SIPTO may be represented by a value of a Result or cause parameter.
- the Handover Command message may include a bearer release parameter, for example, a Bearers to Release parameter.
- Bearers to Release a parameter transmitted, becomes a SIPTO session used in the source (e) NodeB.
- the UE 100 receives the handover command message and transmits a handover confirmation message, for example, a Handover Confirm message, to the target base station (e) NodeB 200c.
- a handover confirmation message for example, a Handover Confirm message
- the target base station (e) NodeB 200c transmits a handover notification message to the target MME 510c, and the target MME 510c sends a relocation completion notification message, for example, a Forward Relocation complete message. Send to source MME 510b and receive a response message.
- a relocation completion notification message for example, a Forward Relocation complete message.
- the UE 100 checks the Result or cause parameter, and if the ongoing session is SIPTO based, deletes the corresponding Bearer of the radio section.
- the UE 100 based on the Reactivation of SIPTO, in order to reset the PDN connection after the handover, through the target base station (e) NodeB (200c) PDN to the target MME (510c) Send the Connectivity Request message.
- the PDN Connectivity Request message is based on a NAS protocol and includes an APN.
- the UE 100 receives a PDN Connectivity Accept message from the target MME 510c.
- MME and S-GW are shown based on the EPC in FIG. 10, the concept of the present invention may be applied to UMTS.
- both the MME and the S-GW may be integrated into SGSN. Accordingly, the signal transmission and reception between the MME and the S-GW shown in FIG. 10 is not performed, and both are processed inside the SGSN.
- FIG. 11 is an exemplary view showing a flowchart according to a modification of the first scheme.
- FIG. 11 The process shown in FIG. 11 is generally similar to the processes shown in FIG. 10. In the following, only the difference process will be described in detail.
- NodeB 300b which is the source base station
- NodeB 200c moves to the target base station
- NodeB 200c moves to the target base station.
- NodeB 300b transmits a handover request message to source MME 510b.
- the source MME 510b determines an appropriate responsible MME among various MMEs managing the target base station (e) NodeB 200c and determines whether to deactivate SIPTO.
- the source MME 510b causes the source L-GW 400b to release the SIPTO PDN.
- the source MME 510b transmits a bearer deactivation request message, for example, a Deactivate bearer request message, to the UE 100 through the source Home (e) NodeB 300b.
- the bearer deactivation request message includes information, indicator, or parameter for reactivating SIPTO PDN connection after handover.
- the information, indicator or parameter for resetting the SIPTO PDN connection after the handover may be expressed as a value of a cause or result parameter.
- the UE 100 checks the Result or cause parameter, and if the ongoing session is SIPTO based, deletes the corresponding Bearer of the radio section.
- the UE 100 transmits a PDN Connectivity Request message to the target MME 510c through the target base station (e) NodeB 200c to reset the PDN connection based on the Reactivation of SIPTO. Send it.
- FIG. 12 is an exemplary view showing a flowchart according to the second scheme.
- the UE 100 receives the SITPO service through the Home (e) NodeB 300b which is the source base station, and then moves to the target base station (e) NodeB 200c that is geographically moved.
- the source MME 510b instructs the UE 100 to regenerate the SIPTO PDN after the handover.
- the source MME 510b informs the UE 100 of this.
- FIG. 12 The process shown in FIG. 12 is generally similar to the process shown in FIG. In the following, only the difference process will be described in detail.
- the source base station Home (e) NodeB (300b) transmits a PDN connection release request message, for example, PDN Connection Release message to the source L-GW (400b).
- the PDN connection release request message includes information, indicator, or parameter for reactivating SIPTO PDN connection after handover.
- the information, indicator, or parameter for resetting the SIPTO PDN connection after the handover may be expressed as a value of a cause or result parameter.
- the source L-GW 400b releases a SIPTO PDN and transmits a bearer delete request message, for example, a Delete Bearer Request message, to the source MME 510b.
- the bearer deletion request message includes information, indicator, or parameter for reactivating a SIPTO PDN connection after handover.
- the source MME 510b transmits the bearer deletion request message to the UE 100.
- the UE 100 sends a PDN Connectivity Request message to the target MME 510c through the target base station (e) NodeB 200c to reset the PDN connection after the handover based on the Reactivation of SIPTO. send.
- the PDN Connectivity Request message is based on a NAS protocol and includes an APN.
- the UE 100 receives a PDN Connectivity Accept message from the target MME 510c.
- FIG. 14 is a configuration block diagram of the UE 100 and the MME 510 according to the present invention.
- the UE 100 includes a storage means 101, a controller 102, and a transceiver 103.
- the MME 510 includes a storage means 511, a controller 512, and a transceiver 513.
- the storage means 101, 511 store the method shown in FIGS. 9-13.
- the controllers 102 and 512 control the storage means 101 and 511 and the transceivers 103 and 513. Specifically, the controllers 102 and 112 respectively execute the methods stored in the storage means 101 and 511. The controllers 102 and 512 transmit the aforementioned signals through the transceivers 103 and 513.
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Abstract
Description
Claims (16)
- 이동통신 네트워크 내의 제어 평면을 담당하는 서버에서 SIPTO 서비스(Selected IP Traffic offload)의 이동성을 지원 방법으로서,소스 기지국에 의해 SIPTO 서비스를 제공받는 단말에 대해 타겟 기지국으로의 핸드오버 요구 메시지를 수신하는 단계와;상기 SIPTO 서비스의 비활성화 여부를 결정하는 단계와;상기 결정에 따라 SIPTO를 위한 PDN(Public Data Network) 연결을 해제하기 위한 절차를 수행하는 단계와;상기 결정에 따라, 핸드오버 이후에 SIPTO를 재활성화(reactivation)하라는 정보를 포함하는 메시지를 상기 소스 기지국을 통해 상기 단말에 전송하는 단계를 포함하는 SIPTO 서비스 이동성 지원 방법.
- 제1항에 있어서, 상기 소스 기지국은 Home (e)NodeB이고, 상기 타겟 기지국은 (e)NodeB인 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 제2항에 있어서,상기 단말은 상기 소스 기지국으로부터 SIPTO 서비스를 제공받기 이전에 다른 (e)NodeB로부터 SIPTO 서비스를 제공받다가, 상기 소스 기지국으로 핸드오버를 수행했던 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 제1항에 있어서, 상기 메시지는핸드오버 명령 메시지, 베어러 비활성화 요청 메시지, Deactivate Bearer Request 메시지 중 어느 하나에 해당하는 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 제1항에 있어서,상기 서버가 상기 SIPTO 서비스를 위한 PDN 정보를 제외한 베어러 컨텍스트 정보를 포함하는 재배치 요청 메시지 또는 Forward Relocation Request 메시지를 타겟 MME(Mobility Management Entity)로 전송하는 단계를 더 포함하는 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 소스 기지국으로부터 단말이 제공받는 SIPTO(Selected IP Traffic offload) 서비스에 대한 이동성을 지원하는 방법으로서,상기 단말이, 상기 소스 기지국으로부터 핸드오버 이후에 SIPTO를 재활성화(reactivation)하라는 정보를 포함하는 메시지를 수신하는 단계와;상기 단말이, 상기 소스 기지국에서 타겟 기지국으로 핸드오버를 수행하는 단계와;상기 단말이, 상기 정보에 기초하여, 상기 타겟 기지국으로 PDN(Public Data Network) 연결 요청 메시지를 전송하는 단계를 포함하는 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 제6항에 있어서, 상기 소스 기지국은 Home (e)NodeB이고, 상기 타겟 기지국은 (e)NodeB인 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 제6항에 있어서,상기 단말은 상기 소스 기지국으로부터 SIPTO 서비스를 제공받기 이전에 다른 (e)NodeB로부터 SIPTO 서비스를 제공받다가, 상기 소스 기지국으로 핸드오버를 수행했던 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 제6항에 있어서, 상기 메시지는핸드오버 명령 메시지, 베어러 비활성화 요청 메시지, Deactivate Bearer Request 메시지 중 어느 하나에 해당하는 것을 특징으로 하는 SIPTO 서비스 이동성 지원 방법.
- 제6항에 있어서,상기 정보에 기초하여, 핸드오버 이후에 SIPTO 서비스를 재활성화할지 결정하는 단계를 더 포함하는 것을 특징으로 하는 이동성 지원 방법.
- SIPTO(Selected IP Traffic offload) 서비스 이동성을 보장하도록 이동통신 네트워크 내의 제어 평면을 담당하는 서버로서,소스 기지국에 의해 SIPTO 서비스를 제공받는 단말에 대해 타겟 기지국으로의 핸드오버 요구 메시지를 수신하는 수신부와;상기 SIPTO 서비스의 비활성화 여부를 결정하는 제어부와;상기 제어부의 결정에 따라 SIPTO를 위한 PDN(Public Data Network) 연결을 해제하기 위한 절차를 수행하고, 상기 결정에 따라 핸드오버 이후에 SIPTO를 재활성화(reactivation)하라는 정보를 포함하는 메시지를 상기 소스 기지국을 통해 상기 단말에 전송하는 송신부를 포함하는 것을 특징으로 하는 제어 평면을 담당하는 서버.
- 제11항에 있어서, 상기 소스 기지국은 Home (e)NodeB이고, 상기 타겟 기지국은 (e)NodeB인 것을 특징으로 하는 제어 평면을 담당하는 서버.
- 제12항에 있어서,상기 단말은 상기 소스 기지국으로부터 SIPTO 서비스를 제공받기 이전에 다른 (e)NodeB로부터 SIPTO 서비스를 제공받다가, 상기 소스 기지국으로 핸드오버를 수행했던 것을 특징으로 하는 제어 평면을 담당하는 서버.
- 제11항에 있어서, 상기 메시지는핸드오버 명령 메시지, 베어러 비활성화 요청 메시지, Deactivate Bearer Request 메시지 중 어느 하나에 해당하는 것을 특징으로 하는 제어 평면을 담당하는 서버.
- 제11항에 있어서,상기 서버가 상기 SIPTO 서비스를 위한 PDN 정보를 제외한 베어러 컨텍스트 정보를 포함하는 재배치 요청 메시지 또는 Forward Relocation Request 메시지를 타겟 MME(Mobility Management Entity)로 전송하는 단계를 더 포함하는 것을 특징으로 하는 제어 평면을 담당하는 서버.
- 소스 기지국으로부터 SIPTO(Selected IP Traffic offload) 서비스를 제공받는 단말로서,수신부와;송신부와; 그리고상기 수신부 및 송신부를 제어하여, 상기 소스 기지국으로부터 핸드오버 이후에 SIPTO를 재활성화(reactivation)하라는 정보를 포함하는 메시지를 수신하고, 상기 소스 기지국에서 타겟 기지국으로 핸드오버를 수행하고, 상기 정보에 기초하여, 상기 타겟 기지국으로 PDN(Public Data Network) 연결 요청 메시지를 전송하는 제어부를 포함하는 단말.
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US14/004,396 US9185621B2 (en) | 2011-04-03 | 2012-04-03 | Server for undertaking control plane in mobile communication network and method for supporting traffic detour service mobility in same server |
EP12767761.5A EP2696611B1 (en) | 2011-04-03 | 2012-04-03 | Method and apparatus for supporting mobility of selected ip traffic offload, sipto, in a communication network |
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Also Published As
Publication number | Publication date |
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EP2696611A4 (en) | 2015-04-22 |
US9185621B2 (en) | 2015-11-10 |
EP2696611A2 (en) | 2014-02-12 |
KR20130127512A (ko) | 2013-11-22 |
KR101502716B1 (ko) | 2015-03-13 |
EP2696611B1 (en) | 2017-08-16 |
WO2012138099A3 (ko) | 2013-01-10 |
US20140003241A1 (en) | 2014-01-02 |
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