WO2016140469A1 - Procédé de commande d'accès d'un terminal dans un système de communication sans fil et dispositif afférent - Google Patents

Procédé de commande d'accès d'un terminal dans un système de communication sans fil et dispositif afférent Download PDF

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Publication number
WO2016140469A1
WO2016140469A1 PCT/KR2016/001930 KR2016001930W WO2016140469A1 WO 2016140469 A1 WO2016140469 A1 WO 2016140469A1 KR 2016001930 W KR2016001930 W KR 2016001930W WO 2016140469 A1 WO2016140469 A1 WO 2016140469A1
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Prior art keywords
service
network entity
terminal
information
session
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PCT/KR2016/001930
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English (en)
Korean (ko)
Inventor
윤명준
김현숙
류진숙
김래영
김태훈
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엘지전자 주식회사
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed

Definitions

  • the following description relates to a wireless communication system, and more particularly, to a method and apparatus for controlling a connection of a terminal.
  • Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA).
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • MCD division multiple access
  • MCDMA multi-carrier frequency division multiple access
  • MC-FDMA multi-carrier frequency division multiple access
  • An object of the present invention is to propose a mechanism for efficiently controlling a connection of a terminal in a mobile communication system such as a wireless local area network (WLAN).
  • WLAN wireless local area network
  • Another object of the present invention is to improve the connection mechanism of the terminal to reduce the signaling overhead of the network entity.
  • Another object of the present invention is to maintain the quality of service of the terminals in service by selectively allowing the connection of the terminal.
  • the information requesting to receive the second service may include at least one of an indicator of the second service, an indicator of an access point name (APN) for the second service, and an indicator requesting to maintain a context of the terminal.
  • API access point name
  • the transmitting of the session creation request message may be performed without waiting for the end of the session process according to the session deletion request message.
  • the receiving of the action frame may be received after the IP flow of the terminal is handed over according to at least one of a routing rule and a user preference set in the terminal.
  • the first network entity may be a Trusted WLAN Access Gateway (TWAG)
  • the second network entity may be a PDN-GateWay (PGW) for the first service
  • the third network entity may be a PGW for the second service.
  • TWAG Trusted WLAN Access Gateway
  • PGW PDN-GateWay
  • the step of notifying that the PDN connection is generated may transmit an action frame including IP information allocated to the terminal and a protocol configuration option (PCO) value to the terminal.
  • PCO protocol configuration option
  • the AAA may be requested to maintain the context information of the terminal via a second network entity.
  • the first network entity for solving the technical problem includes a transmitter, a receiver, and a processor connected to the transmitter and the receiver, wherein the processor receives a second service from a terminal receiving the first service.
  • Control the receiving unit to receive an action frame including information requesting the information, and controls the transmitting unit to transmit a session deletion request message requesting to maintain the context information of the terminal to provide the second service to the second network entity,
  • the transmitter controls the transmitter to transmit a session creation request message to the third network entity requesting to create a PDN connection for the second service, and controls the transmitter to notify the UE that the PDN connection is created.
  • the method of managing subscriber information of a first network entity for solving the technical problem may include a session termination request message requesting to maintain subscriber information of the terminal even if the session of the terminal receiving the first service is terminated from the second network entity.
  • the first network entity is an AAA server
  • the second network entity is a PGW supporting the first service
  • the third network entity is a Home Subscriber Server (HSS)
  • the fourth network entity is a PGW supporting the second service.
  • Another first network entity for solving the above technical problem includes a transmitter, a receiver, and a processor connected to the transmitter and the receiver, wherein the processor is connected to the terminal even if the session of the terminal receiving the first service is terminated. Control the receiving unit to receive a session end request message from the second network entity requesting to retain the subscriber information of the subscriber, and when the session ends according to the session end request message, the subscriber instead of requesting the third network entity to delete the subscriber information.
  • the transmitter controls the transmitter to transmit the retained subscriber information to the fourth network entity.
  • connection process of the terminal is improved, thereby reducing the signaling load of network entities.
  • the quality of the terminals currently in service may be efficiently managed by selectively allowing the access of the terminals.
  • FIG. 1 is a diagram illustrating a schematic structure of an EPS (Evolved Packet System) including an Evolved Packet Core (EPC).
  • EPS Evolved Packet System
  • EPC Evolved Packet Core
  • FIG. 2 is an exemplary view showing the architecture of a general E-UTRAN and EPC.
  • 3 is an exemplary view showing the structure of a radio interface protocol in a control plane.
  • FIG. 4 is an exemplary view showing the structure of a radio interface protocol in a user plane.
  • 5 is a flowchart illustrating a random access procedure.
  • RRC radio resource control
  • 7 and 8 are examples of a structure in which a WLAN is connected to an EPC.
  • FIG. 9 is an exemplary diagram illustrating an example of IP Flow Mobility (IFOM) technology.
  • IFOM IP Flow Mobility
  • 10 (a) and 10 (b) show a network control entity for access network selection.
  • TWAN trusted wireless access network
  • SCM 12 illustrates a protocol stack between a UE and a TWAN operating in a single connection mode (SCM).
  • SCM single connection mode
  • FIG. 13 illustrates a protocol stack between a UE and a TWAN operating in a multiple connection mode (MCM).
  • MCM multiple connection mode
  • FIG. 14 illustrates a TWAN initial access procedure of a UE operating in a transparent SCM (TSCM).
  • TSCM transparent SCM
  • FIG. 15 shows a TWAN initial access procedure of a UE operating in SCM.
  • 16 illustrates a TWAN initial access procedure of a UE operating in MCM.
  • FIG. 18 is a diagram illustrating a traffic classification method for improving quality of service (QoS) in a WLAN.
  • FIG. 19 illustrates a resource area used by a UE to inform that a service type is changed in relation to a proposed embodiment.
  • FIG. 20 illustrates a process of handing over an IP flow by a UE prior to releasing a PDN connection according to the proposed embodiment.
  • 21 is a diagram illustrating a service type change process according to an exemplary embodiment.
  • FIG. 22 is a diagram illustrating an admission control process of a PGW according to another embodiment.
  • FIG. 23 is a diagram illustrating a connection acceptance control process by the TWAG.
  • 24 is a diagram illustrating that a signaling load is reduced according to a proposed embodiment.
  • 25 is a diagram illustrating a configuration of a node device according to an exemplary embodiment.
  • each component or feature may be considered to be optional unless otherwise stated.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some of the components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802.xx system, 3GPP system, 3GPP LTE system and 3GPP2 system. That is, obvious steps or parts which are not described among the embodiments of the present invention may be described with reference to the above documents.
  • UMTS Universal Mobile Telecommunications System
  • GSM Global System for Mobile Communication
  • Evolved Packet System A network system composed of an Evolved Packet Core (EPC), which is a packet switched (PS) core network based on Internet Protocol (IP), and an access network such as LTE / UTRAN.
  • EPC Evolved Packet Core
  • PS packet switched
  • IP Internet Protocol
  • UMTS is an evolutionary network.
  • NodeB base station of GERAN / UTRAN. It is installed outdoors and its coverage is macro cell size.
  • eNodeB base station of E-UTRAN. It is installed outdoors and its coverage is macro cell size.
  • UE User Equipment
  • the UE may be referred to in terms of terminal, mobile equipment (ME), mobile station (MS), and the like.
  • the UE may be a portable device such as a laptop, a mobile phone, a personal digital assistant (PDA), a smart phone, a multimedia device, or the like, or may be a non-portable device such as a personal computer (PC) or a vehicle-mounted device.
  • the term UE or UE may refer to an MTC device.
  • HeNB Home eNodeB: A base station of an EPS network, which is installed indoors and its coverage is micro cell size.
  • Mobility Management Entity A network node of an EPS network that performs mobility management (MM) and session management (SM) functions.
  • Packet Data Network-Gateway (PDN-GW) / PGW / P-GW A network node of an EPS network that performs UE IP address assignment, packet screening and filtering, charging data collection, and the like.
  • SGW Serving Gateway
  • S-GW network node of EPS network performing mobility anchor, packet routing, idle mode packet buffering, triggering MME to page UE, etc. .
  • Non-Access Stratum Upper stratum of the control plane between the UE and the MME.
  • Packet Data Network A network in which a server supporting a specific service (eg, a Multimedia Messaging Service (MMS) server, a Wireless Application Protocol (WAP) server, etc.) is located.
  • a server supporting a specific service eg, a Multimedia Messaging Service (MMS) server, a Wireless Application Protocol (WAP) server, etc.
  • MMS Multimedia Messaging Service
  • WAP Wireless Application Protocol
  • RAN Radio Access Network: a unit including a NodeB, an eNodeB and a Radio Network Controller (RNC) controlling them in a 3GPP network. It exists between UEs and provides a connection to the core network.
  • RNC Radio Network Controller
  • HLR Home Location Register
  • HSS Home Subscriber Server
  • ANDSF Access Network Discovery and Selection Function: Provides a policy that allows a terminal to discover and select available access on an operator basis as a network entity.
  • IP Flow Mobility (IFOM) rule This rule specifies the access technology / access networks that should be used by the UE when it is able to route traffic that matches a particular IP traffic filter on a particular APN or an arbitrary APN. A list organized according to priority. In addition, this rule may specify for which wireless access the traffic that matches a particular IP traffic filter on a particular APN or any APN is restricted.
  • IOM IP Flow Mobility
  • MAPCON Multi Access PDN Connectivity
  • This rule is a list of prioritized access technologies / access networks that should be used by the UE when it is possible to route PDN connections to a particular APN.
  • this rule may specify to which radio access the PDN connection to a particular APN should be restricted.
  • ISMP Inter-System Mobility Policy: A set of rules defined by an operator to influence intersystem mobility decisions performed by a UE. When the UE can route IP traffic on a single radio access interface, the UE can use ISMP to select the most appropriate access technology type or access network at a given time.
  • RAN rule A rule received from the network, also called Radio Access Network (RAN) support information.
  • the RAN rule is also referred to as WLAN interworking supported by the RAN used without ANDSF ISRP / ISMP.
  • the AS (Access Stratum) layer of the UE carries the move-traffic-to-WLAN indication and WLAN identifier together to the upper layer of the UE.
  • the AS (Access Stratum) layer of the UE delivers the move-traffic-from-WLAN indication and the WLAN identifier together to the upper layer of the UE.
  • TS 23.401 For a detailed description of the RAN rule, refer to 3GPP TS 23.401, TS 23.060, TS 23.402, TS 36.300, TS 36.304, TS 36.331, TS 25.304 and TS 25.331.
  • Local Operating Environment Information This is a set of implementation specific parameters which describe the local environment in which the UE is operating.
  • NBIFOM Network-Based IP Flow Mobility
  • NBIFOM Network-initiated NBIFOM
  • Multi-access PDN connection PDN connection through which traffic can be routed via 3GPP access or WLAN access or both accesses. However, each IP flow is only routed through one access at a time.
  • Routing filter A set of IP header parameter values / ranges of a packet flow used to identify an IP flow for routing purposes.
  • Routing access type Type of access (3GPP access or WLAN access) that routes the set of IP flows of the PDN connection.
  • Routing Rule A set of information that allows the association of routing filters with routing access types.
  • FIG. 1 is a diagram illustrating a schematic structure of an EPS (Evolved Packet System) including an Evolved Packet Core (EPC).
  • EPS Evolved Packet System
  • EPC Evolved Packet Core
  • SAE System Architecture Evolution
  • SAE is a research project to determine network structure supporting mobility between various kinds of networks.
  • SAE aims to provide an optimized packet-based system, for example, supporting various radio access technologies on an IP basis and providing enhanced data transfer capabilities.
  • the EPC is a core network of an IP mobile communication system for a 3GPP LTE system and may support packet-based real-time and non-real-time services.
  • a conventional mobile communication system i.e., a second generation or third generation mobile communication system
  • the core network is divided into two distinct sub-domains of circuit-switched (CS) for voice and packet-switched (PS) for data.
  • CS circuit-switched
  • PS packet-switched
  • the function has been implemented.
  • the sub-domains of CS and PS have been unified into one IP domain.
  • EPC IP Multimedia Subsystem
  • the EPC may include various components, and in FIG. 1, some of them correspond to a serving gateway (SGW), a packet data network gateway (PDN GW), a mobility management entity (MME), and a serving general packet (SGRS) Radio Service (Supporting Node) and Enhanced Packet Data Gateway (ePDG) are shown.
  • SGW serving gateway
  • PDN GW packet data network gateway
  • MME mobility management entity
  • SGRS serving general packet
  • Radio Service Upporting Node
  • ePDG Enhanced Packet Data Gateway
  • the SGW acts as a boundary point between the radio access network (RAN) and the core network, and is an element that functions to maintain a data path between the eNodeB and the PDN GW.
  • the SGW serves as a local mobility anchor point. That is, packets may be routed through the SGW for mobility in the E-UTRAN (Universal Mobile Telecommunications System (Evolved-UMTS) Terrestrial Radio Access Network defined in 3GPP Release-8 or later).
  • E-UTRAN Universal Mobile Telecommunications System (Evolved-UMTS) Terrestrial Radio Access Network defined in 3GPP Release-8 or later.
  • SGW also provides mobility with other 3GPP networks (RANs defined before 3GPP Release-8, such as UTRAN or GERAN (Global System for Mobile Communication (GSM) / Enhanced Data rates for Global Evolution (EDGE) Radio Access Network). It can also function as an anchor point.
  • RANs defined before 3GPP Release-8 such as UTRAN or GERAN (Global System for Mobile Communication (GSM) / Enhanced Data rates for Global Evolution (EDGE) Radio Access Network). It can also function as an anchor point.
  • GSM Global System for Mobile Communication
  • EDGE Enhanced Data rates for Global Evolution
  • the PDN GW corresponds to the termination point of the data interface towards the packet data network.
  • the PDN GW may support policy enforcement features, packet filtering, charging support, and the like.
  • mobility management between 3GPP networks and non-3GPP networks for example, untrusted networks such as Interworking Wireless Local Area Networks (I-WLANs), code-division multiple access (CDMA) networks, or trusted networks such as WiMax) Can serve as an anchor point for.
  • untrusted networks such as Interworking Wireless Local Area Networks (I-WLANs), code-division multiple access (CDMA) networks, or trusted networks such as WiMax
  • I-WLANs Interworking Wireless Local Area Networks
  • CDMA code-division multiple access
  • WiMax trusted networks
  • FIG. 1 shows that the SGW and the PDN GW are configured as separate gateways, two gateways may be implemented according to a single gateway configuration option.
  • the MME is an element that performs signaling and control functions to support access to the network connection of the UE, allocation of network resources, tracking, paging, roaming and handover, and the like.
  • the MME controls control plane functions related to subscriber and session management.
  • the MME manages a number of eNodeBs and performs signaling for the selection of a conventional gateway for handover to other 2G / 3G networks.
  • the MME also performs functions such as security procedures, terminal-to-network session handling, and idle terminal location management.
  • SGSN handles all packet data, such as user's mobility management and authentication to other 3GPP networks (eg GPRS networks).
  • 3GPP networks eg GPRS networks.
  • the ePDG acts as a secure node for untrusted non-3GPP networks (eg, I-WLAN, WiFi hotspots, etc.).
  • untrusted non-3GPP networks eg, I-WLAN, WiFi hotspots, etc.
  • a terminal having IP capability is provided by an operator (ie, an operator) via various elements in the EPC, based on 3GPP access as well as non-3GPP access.
  • Access to an IP service network eg, IMS.
  • FIG. 1 also shows various reference points (eg, S1-U, S1-MME, etc.).
  • reference points eg, S1-U, S1-MME, etc.
  • Table 1 summarizes the reference points shown in FIG. 1.
  • This reference point can be used in PLMN-to-PLMN-to-for example (for PLMN-to-PLMN handovers) (It enables user and bearer information exchange for inter 3GPP access network mobility in idle and / or active state This reference point can be used intra-PLMN or inter-PLMN (eg in the case of Inter-PLMN HO).)
  • S4 Reference point between SGW and SGSN that provides related control and mobility support between the GPRS core and SGW's 3GPP anchor functionality.It also provides user plane tunneling if no direct tunnel is established.
  • the 3GPP Anchor function of Serving GW In addition, if Direct Tunnel is not established, it provides the user plane tunnelling.
  • S5 Reference point providing user plane tunneling and tunnel management between the SGW and the PDN GW.
  • the PDN may be an operator external public or private PDN or, for example, an in-operator PDN for the provision of IMS services.
  • Packet data network may be an operator external public or private packet data network or an intra operator packet data network, eg for provision of IMS services.This reference point corresponds to Gi for 3GPP accesses.
  • S2a and S2b correspond to non-3GPP interfaces.
  • S2a is a reference point that provides the user plane with associated control and mobility support between trusted non-3GPP access and PDN GW.
  • S2b is a reference point that provides the user plane with relevant control and mobility support between the ePDG and PDN GW.
  • FIG. 2 is an exemplary view showing the architecture of a general E-UTRAN and EPC.
  • the eNodeB routes resources to the gateway, scheduling and sending paging messages, scheduling and sending broadcast channels (BCHs), and uplink and downlink resources while the Radio Resource Control (RRC) connection is active.
  • Functions such as dynamic allocation to UE, configuration and provision for measurement of eNodeB, radio bearer control, radio admission control, and connection mobility control may be performed.
  • paging can be generated, LTE_IDLE state management, user plane encryption, SAE bearer control, NAS signaling encryption and integrity protection.
  • FIG. 3 is an exemplary diagram illustrating a structure of a radio interface protocol in a control plane between a terminal and a base station
  • FIG. 4 is an exemplary diagram illustrating a structure of a radio interface protocol in a user plane between a terminal and a base station. .
  • the air interface protocol is based on the 3GPP radio access network standard.
  • the air interface protocol is composed of a physical layer, a data link layer, and a network layer horizontally, and a user plane and control for data information transmission vertically. It is divided into a control plane for signal transmission.
  • the protocol layers are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems, and includes L1 (first layer), L2 (second layer), and L3 (third layer). ) Can be separated.
  • OSI Open System Interconnection
  • the physical layer which is the first layer, provides an information transfer service using a physical channel.
  • the physical layer is connected to a medium access control layer on the upper side through a transport channel, and data between the medium access control layer and the physical layer is transmitted through the transport channel.
  • data is transferred between different physical layers, that is, between physical layers of a transmitting side and a receiving side through a physical channel.
  • the physical channel is composed of several subframes on the time axis and several subcarriers on the frequency axis.
  • one subframe is composed of a plurality of OFDM symbols and a plurality of subcarriers on the time axis.
  • One subframe consists of a plurality of resource blocks, and one resource block consists of a plurality of OFDM symbols and a plurality of subcarriers.
  • the transmission time interval (TTI) which is a unit time for transmitting data, is 1 ms corresponding to one subframe.
  • the physical channels existing in the physical layer of the transmitting side and the receiving side are physical downlink shared channel (PDSCH), physical uplink shared channel (PUSCH) and physical downlink control channel (PDCCH), which are control channels, It may be divided into a Physical Control Format Indicator Channel (PCFICH), a Physical Hybrid-ARQ Indicator Channel (PHICH), and a Physical Uplink Control Channel (PUCCH).
  • PCFICH Physical Control Format Indicator Channel
  • PHICH Physical Hybrid-ARQ Indicator Channel
  • PUCCH Physical Uplink Control Channel
  • the medium access control (MAC) layer of the second layer serves to map various logical channels to various transport channels, and also logical channels to map several logical channels to one transport channel. Perform the role of multiplexing.
  • the MAC layer is connected to the upper layer RLC layer by a logical channel, and the logical channel includes a control channel for transmitting information of a control plane according to the type of information to be transmitted. It is divided into a traffic channel that transmits user plane information.
  • the Packet Data Convergence Protocol (PDCP) layer of the second layer is an IP containing relatively large and unnecessary control information for efficient transmission in a wireless bandwidth where bandwidth is small when transmitting an IP packet such as IPv4 or IPv6. Performs Header Compression which reduces the packet header size.
  • the PDCP layer also performs a security function, which is composed of encryption (Ciphering) to prevent third-party data interception and integrity protection (Integrity protection) to prevent third-party data manipulation.
  • the radio resource control layer (hereinafter abbreviated as RRC) layer located at the top of the third layer is defined only in the control plane, and the configuration and reconfiguration of radio bearers (abbreviated as RB) are performed. It is responsible for the control of logical channels, transport channels and physical channels in relation to configuration and release.
  • RB means a service provided by the second layer for data transmission between the terminal and the E-UTRAN.
  • the UE If an RRC connection is established between the RRC of the UE and the RRC layer of the wireless network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode. .
  • the RRC state refers to whether or not the RRC of the UE is in a logical connection with the RRC of the E-UTRAN. If the RRC state is connected, the RRC_CONNECTED state is called, and the RRC_IDLE state is not connected. Since the UE in the RRC_CONNECTED state has an RRC connection, the E-UTRAN can grasp the existence of the UE in units of cells, and thus can effectively control the UE. On the other hand, the UE in the RRC_IDLE state cannot identify the existence of the UE by the E-UTRAN, and the core network manages the unit in a larger tracking area (TA) unit than the cell.
  • TA tracking area
  • each TA is identified by a tracking area identity (TAI).
  • TAI tracking area identity
  • the terminal may configure a TAI through a tracking area code (TAC), which is information broadcast in a cell.
  • TAC tracking area code
  • the terminal When the user first turns on the power of the terminal, the terminal first searches for an appropriate cell, then establishes an RRC connection in the cell, and registers the terminal's information in the core network. Thereafter, the terminal stays in the RRC_IDLE state. The terminal staying in the RRC_IDLE state (re) selects a cell as needed and looks at system information or paging information. This is called camping on the cell.
  • the UE staying in the RRC_IDLE state makes an RRC connection with the RRC of the E-UTRAN through an RRC connection procedure and transitions to the RRC_CONNECTED state.
  • RRC_CONNECTED state There are several cases in which a UE in RRC_IDLE state needs to establish an RRC connection. For example, a user's call attempt, a data transmission attempt, etc. are required or a paging message is received from E-UTRAN. Reply message transmission, and the like.
  • a non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • NAS non-access stratum
  • ESM evolved Session Management
  • the NAS layer performs functions such as default bearer management and dedicated bearer management, and is responsible for controlling the terminal to use the PS service from the network.
  • the default bearer resource is characterized in that it is allocated from the network when it is connected to the network when it first accesses a specific Packet Data Network (PDN).
  • PDN Packet Data Network
  • the network allocates an IP address usable by the terminal so that the terminal can use the data service, and also allocates QoS of the default bearer.
  • LTE supports two types of bearer having a guaranteed bit rate (GBR) QoS characteristic that guarantees a specific bandwidth for data transmission and reception, and a non-GBR bearer having a best effort QoS characteristic without guaranteeing bandwidth.
  • GBR guaranteed bit rate
  • Non-GBR bearer is assigned.
  • the bearer allocated to the terminal in the network is called an evolved packet service (EPS) bearer, and when the EPS bearer is allocated, the network allocates one ID. This is called EPS Bearer ID.
  • EPS bearer ID One EPS bearer has a QoS characteristic of a maximum bit rate (MBR) or / and a guaranteed bit rate (GBR).
  • 5 is a flowchart illustrating a random access procedure in 3GPP LTE.
  • the random access procedure is performed for the UE to obtain UL synchronization with the base station or to be allocated UL radio resources.
  • the UE receives a root index and a physical random access channel (PRACH) configuration index from the eNodeB.
  • PRACH physical random access channel
  • Each cell has 64 candidate random access preambles defined by a Zadoff-Chu (ZC) sequence, and the root index is a logical index for the UE to generate 64 candidate random access preambles.
  • ZC Zadoff-Chu
  • the PRACH configuration index indicates a specific subframe and a preamble format capable of transmitting the random access preamble.
  • the UE sends the randomly selected random access preamble to the eNodeB.
  • the UE selects one of the 64 candidate random access preambles.
  • the corresponding subframe is selected by the PRACH configuration index.
  • the UE transmits the selected random access preamble in the selected subframe.
  • the eNodeB Upon receiving the random access preamble, the eNodeB sends a random access response (RAR) to the UE.
  • RAR random access response
  • the random access response is detected in two steps. First, the UE detects a PDCCH masked with random access-RNTI (RA-RNTI). The UE receives a random access response in a medium access control (MAC) protocol data unit (PDU) on the PDSCH indicated by the detected PDCCH.
  • MAC medium access control
  • RRC 6 shows a connection process in a radio resource control (RRC) layer.
  • RRC radio resource control
  • the RRC state is shown depending on whether the RRC is connected.
  • the RRC state refers to whether or not an entity of the RRC layer of the UE is in a logical connection with an entity of the RRC layer of the eNodeB.
  • the RRC state is referred to as an RRC connected state.
  • the non-state is called the RRC idle state.
  • the E-UTRAN may determine the existence of the corresponding UE in units of cells, and thus may effectively control the UE.
  • the UE in the idle state can not be identified by the eNodeB, the core network (core network) is managed by the tracking area (Tracking Area) unit that is larger than the cell unit.
  • the tracking area is a collection unit of cells. That is, the idle state (UE) is determined only in the presence of the UE in a large area, and in order to receive a normal mobile communication service such as voice or data, the UE must transition to the connected state (connected state).
  • the UE When a user first powers up a UE, the UE first searches for an appropriate cell and then stays in an idle state in that cell. When the UE staying in the idle state needs to establish an RRC connection, the UE establishes an RRC connection with the RRC layer of the eNodeB through an RRC connection procedure and transitions to an RRC connected state. .
  • the UE in the idle state needs to establish an RRC connection. For example, a user's call attempt or uplink data transmission is required, or a paging message is received from EUTRAN. In this case, the response message may be transmitted.
  • the RRC connection process is largely a process in which a UE sends an RRC connection request message to an eNodeB, an eNodeB sends an RRC connection setup message to the UE, and a UE completes RRC connection setup to the eNodeB. (RRC connection setup complete) message is sent. This process will be described in more detail with reference to FIG. 6 as follows.
  • the eNB When the RRC connection request message is received from the UE, the eNB accepts the RRC connection request of the UE when the radio resources are sufficient, and transmits an RRC connection setup message, which is a response message, to the UE. .
  • the UE When the UE receives the RRC connection setup message, it transmits an RRC connection setup complete message to the eNodeB. When the UE successfully transmits an RRC connection establishment message, the UE establishes an RRC connection with the eNodeB and transitions to the RRC connected mode.
  • FIG. 7 and 8 illustrate an example of a structure in which a WLAN is connected to an EPC.
  • FIG. 7 shows an architecture where a WLAN is connected to a P-GW via an S2a interface (see 3GPP TS 23.402).
  • the WLAN access network is connected to the P-GW via the S2a interface (in particular, the S2a interface is a Trusted WLAN access network because it is an interface that connects trusted non-3GPP access with the EPC).
  • TWAN Trusted WLAN Access Network
  • WLAN 8 is an illustration of an architecture in which a WLAN is connected to a P-GW via an S2b interface.
  • the WLAN access network is an untrusted WLAN access network (especially, in the case of the S2b interface, which connects untrusted non-3GPP access with the EPC). It is connected to P-GW through Packet Data Gateway.
  • a trusted WLAN and an untrusted WLAN may be referred to as WLAN without distinction.
  • Data of the user terminal may be offloaded to WLAN access without going through 3GPP access.
  • technologies for supporting such multiple radio accesses there are IP Flow Mobility and Seamless Offload (IFOM), Multi Access PDN Connectivity (MAPCON), and the like.
  • IFOM IP Flow Mobility and Seamless Offload
  • MAPCON transmits data with 3GPP access and Wi-Fi access as separate PDN connections
  • IFOM transmits data by binding 3GPP access and Wi-Fi access to a single PDN or P-GW.
  • IFOM 9 is an exemplary view showing an example of IFOM technology.
  • the IFOM may provide the same PDN connection through different accesses at the same time. This IFOM provides seamless transmission and reception by bypassing the WLAN.
  • IFOM can carry the IP flow of the same PDN connection from one access to another. As such, thanks to the technology that can divert the traffic of the UE to a wireless LAN, it can reduce the congestion of cellular access of the mobile operator.
  • an access network discovery and selection function (ANDSF) based on 3GPP may provide a policy related to a wireless LAN.
  • the ANDSF may exist in a home public land mobile network (HPLMN) of a UE.
  • the ANDSF may also exist in a visited public land mobile network (VPLMN) of the UE.
  • H-ANDSF when the ANDSF is located in the home network, it may be called H-ANDSF, and when the ANDSF is located in the visited network, it may be called V-ANDSF.
  • H-ANDSF when the ANDSF is located in the home network, it may be called H-ANDSF, and when the ANDSF is located in the visited network, it may be called V-ANDSF.
  • ANDSF is used as a concept that includes both H-ANDSF and V-ANDSF.
  • the ANDSF can provide routing rules, such as information about inter-system mobility policy (ISMP), information for access network discovery, and information about inter-system routing policy (ISRP). have.
  • ISMP inter-system mobility policy
  • ISRP inter-system routing policy
  • TWAN trusted wireless access network
  • TWAG Trusted WLAN Access Gateway
  • TWAP Trusted WLAN AAA Proxy
  • AAA Authentication Authorization Accounting
  • TSCM transparent single connection mode
  • SCM single connection mode
  • MCM multiple connection mode
  • FIG. 12 illustrates a protocol stack between a UE operating in a single connection mode (SCM) and a TWAN
  • FIG. 13 illustrates a protocol stack between a UE operating in a multiple connection mode (MCM) and a TWAN.
  • the MCM mode may operate only when the WLCP protocol is supported for both the UE and the TWAN. If only one of the UE or the TWAN supports the WLCP protocol, the UE operates in the TSCM or SCM mode.
  • FIGS. 14 to 16 illustrate a TWAN initial access procedure of a UE operating in TSCM or SCM.
  • FIG. 14 shows a case of TSCM (Transparent SCM)
  • FIG. 15 shows a case of SCM
  • FIG. 16 shows a case of MCM.
  • the UE operating in the SCM mode initially attaches to the TWAN through an Initial Attach and Authentization & Authorization procedure.
  • a PDN connection is generated between the UE and the PGW through steps 12 and 14.
  • FIG. 16 omits the signaling procedure for generating a PDN connection between the TWAN and the PGW from FIG. 15, and illustrates only an authentication and authorization procedure.
  • FIG. 17 simplifies and illustrates the process shown in FIGS. 14 to 16.
  • parts indicated by (A) and (B) indicate a part that operates only in the case of TSCM / SCM
  • step 16 is a part that operates only in the case of MCM.
  • a PDN connection is created through an authentication and authorization procedure.
  • a PDN connection is not created during the authentication and authorization procedure, but a PDN connection is created using the WLCP after the authentication and authorization procedure is completed. That is, in case of a UE operating as an MCM, a PDN connection is created in step 16 after both authentication and authorization procedures are completed.
  • FIG. 18 is a diagram illustrating a traffic discriminating method for improving QoS in a WLAN.
  • the IEEE 802.11e standard has been introduced.
  • traffic is divided into four categories: background, best effort, video, and voice.
  • QoS can be guaranteed by applying different backoff parameters for each traffic, and voice traffic has the highest priority. Since the voice traffic has the shortest Inter Frame Space (IFS) value and the smallest contention window, the channel can always access the channel first compared to other traffic, thereby providing a stable service.
  • IFS Inter Frame Space
  • the UE In order to access a 3GPP core network via a WLAN, the UE must perform an authentication procedure.
  • the UE and the TWAN perform authentication of the AAA server and the UE through the STa interface. Since the authentication procedure requires a lot of signaling as shown in Figs. 14 to 16, the load on the AAA server is important. Meanwhile, there is a process of negotiating in which mode the UE connects in the authentication process, and various information required for connection is transmitted and received between the AAA, the UE, and the TWAN according to the selected mode (TSCM, SCM, or MCM). In this case, since the protocol required for the connection between the UE and the network is not defined separately in the TSCM / SCM mode, all signaling for authentication is transmitted and received through an authentication and authorization procedure between the UE and the AAA server.
  • TSCM selected mode
  • the UE can have only one PDN connection in the TSCM / SCM mode, when the APN using the IMS service and the APN using the Internet are different, the UE can receive only one of the Internet service and the IMS service. have. Therefore, in order to receive voice service, the UE receiving the Internet service needs to disconnect the PDN for the Internet and create a new PDN connection with the IMS APN. In this process, signaling with the AAA server frequently occurs, and the signaling load to the AAA server may be unnecessarily increased. In particular, despite the feature that emergency services must be processed quickly, there may be a potential service delay due to waiting until the end of the authentication process between the UE and the AAA server.
  • the AAA server may perform a throttling or prioritization operation on the authentication message to reduce the load.
  • a throttling or prioritization operation may cause a problem that may make it difficult for the UE to connect to the WLAN, thus making it impossible to connect to an emergency service or a connection delay may occur. Therefore, there is a need for a method for providing voice service in a WLAN while considering the load of an AAA server.
  • a method for efficiently providing a voice service in a WLAN is proposed.
  • the UE when the UE is connected to the WLAN in the TSCM or SCM mode, an embodiment of providing a voice service without an authentication procedure through the AAA server is proposed.
  • the present invention proposes an embodiment in which a PGW or a TWAG manages the number of UEs provided with services by accessing a TWAN, so that a user may be efficiently provided with voice service.
  • the two embodiments described separately may be performed independently or together.
  • FIG. 20 illustrates a process of handing over an IP flow by a UE prior to releasing a PDN connection according to the proposed embodiment. That is, as described above, in order to provide a new type of service to a UE, a preset PDN connection must be released to the UE.
  • the present invention proposes how to manage an IP flow before releasing the PDN connection. In particular, an embodiment when the UE is located within 3GPP coverage will be described.
  • some or all of the IP flows provided to the UE may be handed over to the 3GPP network depending on whether or not a routing rule preset to the UE is allowed. Even if a preset routing rule does not exist in the UE, part or all of the IP flow may be handed over to the 3GPP network. If the routing rule does not allow handover of the IP flow, local deactivation is performed without handover of the IP flow. If the user preference allows handover through interaction with the user, the IP flow may be handed over to the 3GPP network even if the handover is not allowed by the routing rule.
  • some or all of the preset IP flows between the UE and the WLAN may be handed over to the 3GPP network prior to the release of the PDN connection, and the handover of the IP flows is considered in consideration of one or more of routing rules and user preferences set in the UE. Whether or not can be determined. If it is determined whether to handover for all IP flows, the UE performs handover only for IP flows requiring handover. That is, in consideration of routing rules or user preferences, IP flows that cannot be handed over to 3GPP networks are deactivated.
  • the UE transmits the action frame to the TWAN after all the handovers of the IP flows are performed, and transmits information indicating that a new service type is required and requires a new PDN connection to the TWAN as described above with reference to FIG. 19.
  • the TWAN determines that the UE has performed all of the required IP flow handover procedures, and releases the existing PDN connection even if there are remaining IP flows.
  • the TWAN does not need to deactivate all the IP flows or bearers. That is, the TWAN deactivates only an IP flow or bearer marked as deactivation in consideration of the information included in the received action frame.
  • the EPS bearer context state IE Information Element
  • the EPS bearer context state IE may be used to indicate the information on the activation / deactivation IP flow and the activation / deactivation bearer included in the action frame, and may be included in the action frame in a bitmap format.
  • the TWAN may selectively deactivate only some IP flows or bearers that may be deactivated in the conventional PDN connection. Accordingly, only an IP flow or a bearer capable of handover can be handed over to a PDN connection to a 3GPP network, thereby creating a new PDN connection more quickly.
  • the TWAN releases the PDN connection previously set in the UE.
  • FIG. 21 is a diagram illustrating a service type change process according to an exemplary embodiment.
  • a UE receives an Internet service through a PDN connection generated in a TSCM or SCM mode, and considers a situation in which a UE is not configured to perform handover to 3GPP for a pre-generated PDN connection.
  • the information indicating that the voice service is required may include information indicating the voice service type itself or APN information for the voice service.
  • the information indicating that the voice service is required is implemented to include an indicator requesting the AAA server to maintain the context information of the UE so that the UE itself is not detached from the network, in addition to the APN information and the information indicating the voice service itself. May be
  • the TWAG receives an action frame including an indicator indicating that voice service is required from the UE, the TWAG performs a session termination procedure for deleting an Internet session in use by the UE (step 2), and the TWAG performs a PGW. Send a session delete request message to the.
  • the TWAG since the TWAG receives the information that the voice service is required from the UE, when the TWAG transmits the session deletion request message to the PGW, the TWAG transmits an indicator for the voice service as a cause value.
  • the TWAG may generate and send an indicator to the PGW requesting that the AAA server not clear the UE context.
  • the TWAG receives at least one of: i) when a new service and / or APN information different from the existing service and / or APN information is received from the UE; ii) when the context information of the UE is maintained for the AAA server.
  • the TWAG may transmit information to the UE that the new voice service is required to the PGW, and may request the AAA server to maintain the UE context.
  • the PGW When the PGW receives an indicator indicating a voice service (or receives an indicator requesting the AAA server not to clear the UE context), the PGW sends avp () in the diameter message when sending a session end request message to the AAA server.
  • the AAA server can recognize that the voice service is requested from the UE (step 3). .
  • the AAA server may know that even if the last PDN connection of the UE is terminated, the creation of a PDN connection for voice service will be immediately requested from the UE. Therefore, the AAA server maintains the context information of the UE without deleting it.
  • the TWAG sends a session creation request message to the PGW that supports the voice service immediately without waiting for the end of the session termination process 2110 described above to generate a new PDN connection for the voice service (step 6).
  • the PGW for the voice service may be the same as or different from the PGW for the previous Internet service. If the two PGWs are different, the PGW for the voice service may be determined from the APN information present in the action frame transmitted by the UE in step 1, or if the APN information is not included in the action frame, any one of the APNs previously stored in the TWAN. May be selected. Meanwhile, in the process of creating a new session, the AAA server does not delete the context information of the UE and thus does not need to newly obtain the user information from the HSS.
  • the TWAG transmits an action frame to the UE (step 9), indicating that the PDN connection for the voice service requested by the UE has been successfully connected.
  • the TWAG may include IP information allocated to the UE included in the session creation response message and a Protocol Configuration Option (PCO) value in the element part of the action frame and transmit the same to the UE.
  • PCO Protocol Configuration Option
  • the UE performs an operation required for a voice service using the IP information and the PCO value received from the PGW (2130).
  • the UE can be provided with a voice service even without a complicated authentication procedure with the AAA server, thereby reducing the load on the AAA server.
  • the voice / emergency service is delayed due to the overload occurring in the AAA server. .
  • the UE If the UE terminates the voice service and wishes to receive Internet service again, the UE transmits an action frame including an indicator indicating the Internet service (or APN information for the Internet service) to the TWAG, or the AAA server of the UE An action frame containing an indicator requesting not to clear the context can be sent to the TWAG. Accordingly, the TWAG may disconnect the PDN connection for the voice service (2140) and generate a new PDN connection for the Internet service (2150).
  • APN information may be omitted in an action frame transmitted by the UE to the TWAG.
  • 24 is a diagram illustrating that a signaling load is reduced according to a proposed embodiment.
  • the UE operating in the SCM mode and receiving the Internet service has to undergo an authentication process through the AAA server in order to create a PDN connection in order to receive voice service, resulting in excessive signaling load.
  • the proposed embodiment it is possible to omit the authentication and authorization procedure for creating a new PDN connection as described above, thereby significantly reducing the signaling overhead of the new session creation process.
  • 24 illustrates a signaling process that is reduced according to an embodiment proposed by the dotted line in FIG. 24.
  • the PGW may know what service the UE intends to create a session with in the WLAN based on the bearer QoS included in the session creation request message. In addition, since the identifier of the TWAG is specified in the session creation request message, the PGW may know how many UEs are connected to the TWAG for what service.
  • the admission control function is performed according to a predetermined service priority even if the service is not an emergency service. If the PGW configures the TWAG not to allocate more than a certain amount of radio resources, the TWAG can directly control the bearer as configured by the PGW.
  • FIG. 22 is a diagram illustrating an admission control process of a PGW according to another embodiment.
  • the UE receiving the Internet service transmits an action frame to receive the voice service, but the PGW does not allow the voice service through the access acceptance control.
  • the TWAG releases the existing PDN connection (steps 2 and 2210) and sends a session creation request message to the PGW to create a PDN connection for the voice service (steps 6 and 2220).
  • the PGW determines not to allow more UEs to access the WLAN in consideration of the quality of service of other UEs, and accordingly, transmits a session creation response message indicating that the session creation has been rejected to the TWAN (steps 8 and 2220).
  • the TWAG re-creates the PDN connection for the existing Internet service (steps 6 and 2230) and sends an action frame to the UE indicating that the voice service has been denied (step 9 ).
  • the TWAG may indicate that the voice service is rejected by the SGW or the PGW as a cause of rejection.
  • the TWAG performs direct access acceptance control. That is, when conditions and elements for access acceptance control are previously set in the TWAG from the PGW (step 1), the TWAG may perform direct access control to approve or reject the UE connection (step 2 and step 3). . In this case, since the UE's access request does not need to be delivered to the PGW, the signaling process can be omitted a lot.
  • 25 is a diagram illustrating a configuration of a node device according to an exemplary embodiment.
  • the terminal device 100 may include a transceiver 110, a processor 120, and a memory 130.
  • the transceiver 110 may be configured to transmit various signals, data and information to an external device, and to receive various signals, data and information to an external device. Alternatively, the transceiver 110 may be implemented by being separated into a transmitter and a receiver.
  • the terminal device 100 may be connected to an external device by wire and / or wirelessly.
  • the processor 120 may control the overall operation of the terminal device 100, and may be configured to perform a function of the terminal device 100 to process and process information to be transmitted and received with an external device.
  • the processor 120 may be configured to perform a terminal operation proposed in the present invention.
  • the memory 130 may store the processed information for a predetermined time and may be replaced with a component such as a buffer (not shown).
  • the network node device 200 may include a transceiver 210, a processor 220, and a memory 230.
  • the transceiver 210 may be configured to transmit various signals, data and information to an external device, and to receive various signals, data and information to an external device.
  • the network node device 200 may be connected to an external device by wire and / or wirelessly.
  • the transceiver 210 may be implemented by being separated into a transmitter and a receiver.
  • the processor 220 may control the overall operation of the network node device 200, and may be configured to perform a function of calculating and processing information to be transmitted / received with an external device.
  • the processor 220 may be configured to perform the network node operation proposed in the present invention.
  • the memory 230 may store the processed information for a predetermined time and may be replaced with a component such as a buffer (not shown).
  • the specific configuration of the terminal device 100 and the network device 200 as described above may be implemented so that the above-described matters described in various embodiments of the present invention can be applied independently or two or more embodiments are applied at the same time, overlapping The description is omitted for clarity.
  • Embodiments of the present invention described above may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • the method according to the embodiments of the present invention may be implemented in the form of an apparatus, procedure, or function for performing the above-described functions or operations.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • the access control method as described above can be applied to various wireless communication systems including not only 3GPP systems but also IEEE 802.16x and 802.11x systems. Furthermore, the proposed method can be applied to mmWave communication system using ultra high frequency band.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé de commande d'accès destiné à recevoir, depuis un terminal fonctionnant en SCM ou TSCM et auquel un premier service est fourni, une trame d'action comprenant des informations pour demander la fourniture d'un second service, transmettre, à une deuxième entité de réseau, un message de demande de suppression de session demandant la maintenance d'informations de contexte du terminal, de façon à fournir le second service, transmettre, à une troisième entité de réseau, un message de demande de création de session demandant la création d'une connexion PDN pour le second service et notifier à un équipement d'utilisateur (UE) la création de la connexion PDN.
PCT/KR2016/001930 2015-03-05 2016-02-26 Procédé de commande d'accès d'un terminal dans un système de communication sans fil et dispositif afférent WO2016140469A1 (fr)

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