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WO2018016927A1 - Procédé et dispositif d'émission/réception de message nas - Google Patents

Procédé et dispositif d'émission/réception de message nas Download PDF

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Publication number
WO2018016927A1
WO2018016927A1 PCT/KR2017/007936 KR2017007936W WO2018016927A1 WO 2018016927 A1 WO2018016927 A1 WO 2018016927A1 KR 2017007936 W KR2017007936 W KR 2017007936W WO 2018016927 A1 WO2018016927 A1 WO 2018016927A1
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Prior art keywords
message
mme
terminal
base station
nas
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English (en)
Korean (ko)
Inventor
변대욱
김태훈
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LG Electronics Inc
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LG Electronics Inc
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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
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for transmitting or receiving a non-access stratum (NAS) message by a base station or MME / AMF and an apparatus supporting the same.
  • NAS non-access stratum
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (beyond 4G network) or after a long term evolution (LTE) system (post LTE).
  • the terminal and the network may support user plane EPS optimization.
  • the user plane EPS optimization function may enable delivery of user plane data without having to use a service request procedure to set an access stratum (AS) context at a serving base station and a terminal.
  • AS access stratum
  • the base station may suspend the RRC connection.
  • the RRC connection may be temporarily suspended.
  • the base station may resume the RRC connection.
  • the RRC connection may be resumed through an RRC connection resume procedure.
  • the base station may transmit a UE context resumption request message to the MME, and may deliver a NAS message received from the terminal to the MME using an uplink NAS transfer message.
  • the MME sends a UE context resume failure message to the base station in response to the UE context resume request message before the MME receives the NAS message from the base station
  • the base station releases the RRC connection, so the base station receives the NAS from the terminal.
  • the message may not be delivered to the MME. That is, the MME may not receive the NAS message transmitted by the terminal. Therefore, even if UE context resumption fails, a method needs to be proposed to enable the MME to receive NAS messages.
  • a method for transmitting a non-access stratum (NAS) message by a base station in a wireless communication system includes receiving an indicator from a terminal indicating that there is a NAS message to be transmitted; And transmitting a UE context resume request message including the indicator to a mobility management entity (MME).
  • MME mobility management entity
  • the indicator may be included in an RRC Connection Resume Request message and received from the terminal.
  • the indicator may be included in an RRC Connection Resume Complete message and received from the terminal.
  • transmission of the message corresponding to the UE context resume request message may be interrupted by the MME until the MME receives a NAS message from the base station.
  • the message corresponding to the UE context resumption request message may be either a UE context resume response message or a UE context resume failure message.
  • the MME may be an access and mobility function (AMF).
  • AMF access and mobility function
  • a method of receiving a non-access stratum (NAS) message by a mobility management entity (MME) in a wireless communication system includes receiving a UE Context Resume Request message from a base station that includes an indicator indicating that there is a NAS message to be sent; And stopping transmission of a message corresponding to the UE context resume request message.
  • NAS non-access stratum
  • MME mobility management entity
  • the UE context resume request message includes the indicator, transmission of the message corresponding to the UE context resume request message may be stopped until the MME receives the NAS message from the base station.
  • the method may further include receiving the NAS message from the base station.
  • the method may further include initiating transmission of a message corresponding to the suspended UE context resume request message if the NAS message is received from the base station.
  • the method may further include starting a timer if the UE context resume request message includes the indicator.
  • the transmission of the message corresponding to the UE context resume request message may be suspended until the started timer expires.
  • the method may further include initiating transmission of a message corresponding to the suspended UE context resumption request message when the started timer expires.
  • the message corresponding to the UE context resumption request message may be either a UE context resume response message or a UE context resume failure message.
  • a base station for transmitting a non-access stratum (NAS) message in a wireless communication system.
  • the base station includes a memory; Transceiver; And a processor that connects the memory and the transceiver, wherein the processor controls the transceiver to receive an indicator indicating that there is a NAS message to be transmitted from the terminal, and the transceiver includes a request to resume the UE context including the indicator.
  • the message may be configured to control transmission of a UE Context Resume Request message to a mobility management entity (MME).
  • MME mobility management entity
  • MME / AMF may receive NAS messages.
  • FIG. 1 shows a structure of an LTE system.
  • FIG. 2 shows an air interface protocol of an LTE system for a control plane.
  • FIG 3 shows an air interface protocol of an LTE system for a user plane.
  • FIG. 5 illustrates a procedure of resuming ECM connection when the terminal and the network support user plane EPS optimization.
  • FIG. 6 illustrates a procedure of delivering a NAS message to an MME based on an indicator according to an embodiment of the present invention.
  • FIG. 7 illustrates a procedure of delivering a NAS message to an MME based on an indicator according to an embodiment of the present invention.
  • FIG. 8 illustrates a procedure of delivering a NAS message to an MME based on an indicator according to an embodiment of the present invention.
  • FIG. 9 is a block diagram illustrating a method for transmitting a NAS message by a base station according to an embodiment of the present invention.
  • FIG. 10 is a block diagram illustrating a method of receiving an NAS message by an MME according to an embodiment of the present invention.
  • FIG. 11 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
  • 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
  • CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented by wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • 5G communication system is the evolution of LTE-A.
  • FIG. 1 shows a structure of an LTE system.
  • Communication networks are widely deployed to provide various communication services such as IMS and Voice over internet protocol (VoIP) over packet data.
  • VoIP Voice over internet protocol
  • an LTE system structure includes one or more UEs 10, an evolved-UMTS terrestrial radio access network (E-UTRAN), and an evolved packet core (EPC).
  • the terminal 10 is a communication device moved by a user.
  • the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), and a wireless device.
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • wireless device a wireless device.
  • the E-UTRAN may include one or more evolved node-eB (eNB) 20, and a plurality of terminals may exist in one cell.
  • the eNB 20 provides an end point of a control plane and a user plane to the terminal.
  • the eNB 20 generally refers to a fixed station communicating with the terminal 10, and may be referred to in other terms such as a base station (BS), a base transceiver system (BTS), an access point, and the like.
  • BS base station
  • BTS base transceiver system
  • One eNB 20 may be arranged per cell. There may be one or more cells within the coverage of the eNB 20.
  • One cell may be configured to have one of bandwidths such as 1.25, 2.5, 5, 10, and 20 MHz to provide downlink (DL) or uplink (UL) transmission service to various terminals. In this case, different cells may be configured to provide different bandwidths.
  • DL means communication from the eNB 20 to the terminal 10
  • UL means communication from the terminal 10 to the eNB 20.
  • the transmitter may be part of the eNB 20 and the receiver may be part of the terminal 10.
  • the transmitter may be part of the terminal 10 and the receiver may be part of the eNB 20.
  • the EPC may include a mobility management entity (MME) that serves as a control plane, and a system architecture evolution (SAE) gateway (S-GW) that serves as a user plane.
  • MME mobility management entity
  • SAE system architecture evolution gateway
  • S-GW gateway
  • the MME / S-GW 30 may be located at the end of the network and is connected to an external network.
  • the MME has information about the access information of the terminal or the capability of the terminal, and this information may be mainly used for mobility management of the terminal.
  • S-GW is a gateway having an E-UTRAN as an endpoint.
  • the MME / S-GW 30 provides the terminal 10 with the endpoint of the session and the mobility management function.
  • the EPC may further include a packet data network (PDN) -gateway (GW).
  • PDN-GW is a gateway with PDN as an endpoint.
  • the MME includes non-access stratum (NAS) signaling to the eNB 20, NAS signaling security, access stratum (AS) security control, inter CN (node network) signaling for mobility between 3GPP access networks, idle mode terminal reachability ( Control and execution of paging retransmission), tracking area list management (for terminals in idle mode and active mode), P-GW and S-GW selection, MME selection for handover with MME change, 2G or 3G 3GPP access Bearer management, including roaming, authentication, and dedicated bearer settings, SGSN (serving GPRS support node) for handover to the network, public warning system (ETWS) and commercial mobile alarm system (PWS) It provides various functions such as CMAS) and message transmission support.
  • NAS non-access stratum
  • AS access stratum
  • inter CN node network
  • MME selection for handover with MME change
  • 2G or 3G 3GPP access Bearer management including roaming, authentication, and dedicated bearer settings
  • SGSN serving GPRS support no
  • S-GW hosts can be based on per-user packet filtering (eg, through deep packet inspection), legal blocking, terminal IP (Internet protocol) address assignment, transport level packing marking in DL, UL / DL service level charging, gating and It provides various functions of class enforcement, DL class enforcement based on APN-AMBR.
  • MME / S-GW 30 is simply represented as a "gateway", which may include both MME and S-GW.
  • An interface for user traffic transmission or control traffic transmission may be used.
  • the terminal 10 and the eNB 20 may be connected by the Uu interface.
  • the eNBs 20 may be interconnected by an X2 interface. Neighboring eNBs 20 may have a mesh network structure by the X2 interface.
  • the eNBs 20 may be connected with the EPC by the S1 interface.
  • the eNBs 20 may be connected to the EPC by the S1-MME interface and may be connected to the S-GW by the S1-U interface.
  • the S1 interface supports a many-to-many-relation between eNB 20 and MME / S-GW 30.
  • the eNB 20 may select for the gateway 30, routing to the gateway 30 during radio resource control (RRC) activation, scheduling and transmission of paging messages, scheduling channel information (BCH), and the like.
  • RRC radio resource control
  • BCH scheduling channel information
  • the gateway 30 may perform paging initiation, LTE idle state management, user plane encryption, SAE bearer control, and encryption and integrity protection functions of NAS signaling in the EPC.
  • FIG. 2 shows an air interface protocol of an LTE system for a control plane.
  • 3 shows an air interface protocol of an LTE system for a user plane.
  • the layer of the air interface protocol between the UE and the E-UTRAN is based on the lower three layers of the open system interconnection (OSI) model, which is well known in communication systems, and includes L1 (first layer), L2 (second layer), and L3 (third layer). Hierarchical).
  • the air interface protocol between the UE and the E-UTRAN may be horizontally divided into a physical layer, a data link layer, and a network layer, and vertically a protocol stack for transmitting control signals.
  • Layers of the radio interface protocol may exist in pairs in the UE and the E-UTRAN, which may be responsible for data transmission of the Uu interface.
  • the physical layer belongs to L1.
  • the physical layer provides an information transmission service to a higher layer through a physical channel.
  • the physical layer is connected to a higher layer of a media access control (MAC) layer through a transport channel.
  • Physical channels are mapped to transport channels.
  • Data may be transmitted between the MAC layer and the physical layer through a transport channel.
  • Data between different physical layers, that is, between the physical layer of the transmitter and the physical layer of the receiver may be transmitted using radio resources through a physical channel.
  • the physical layer may be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • the physical layer uses several physical control channels.
  • a physical downlink control channel (PDCCH) reports resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH), and hybrid automatic repeat request (HARQ) information related to the DL-SCH to the UE.
  • the PDCCH may carry an uplink grant to report to the UE regarding resource allocation of uplink transmission.
  • the physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for the PDCCH and is transmitted every subframe.
  • a physical hybrid ARQ indicator channel (PHICH) carries a HARQ ACK (non-acknowledgement) / NACK (non-acknowledgement) signal for UL-SCH transmission.
  • a physical uplink control channel (PUCCH) carries UL control information such as HARQ ACK / NACK, a scheduling request, and a CQI for downlink transmission.
  • the physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH).
  • the physical channel includes a plurality of subframes in the time domain and a plurality of subcarriers in the frequency domain.
  • One subframe consists of a plurality of symbols in the time domain.
  • One subframe consists of a plurality of resource blocks (RBs).
  • One resource block is composed of a plurality of symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific symbols of the corresponding subframe for the PDCCH.
  • the first symbol of the subframe may be used for the PDCCH.
  • the PDCCH may carry dynamically allocated resources, such as a physical resource block (PRB) and modulation and coding schemes (MCS).
  • a transmission time interval (TTI) which is a unit time at which data is transmitted, may be equal to the length of one subframe.
  • One subframe may have a length of 1 ms.
  • a DL transport channel for transmitting data from a network to a UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a DL-SCH for transmitting user traffic or control signals. And the like.
  • BCH broadcast channel
  • PCH paging channel
  • DL-SCH supports dynamic link adaptation and dynamic / semi-static resource allocation by varying HARQ, modulation, coding and transmit power.
  • the DL-SCH may enable the use of broadcast and beamforming throughout the cell.
  • System information carries one or more system information blocks. All system information blocks can be transmitted in the same period. Traffic or control signals of a multimedia broadcast / multicast service (MBMS) are transmitted through a multicast channel (MCH).
  • MCH multicast channel
  • the UL transport channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message, a UL-SCH for transmitting user traffic or a control signal, and the like.
  • the UL-SCH can support dynamic link adaptation due to HARQ and transmit power and potential changes in modulation and coding.
  • the UL-SCH may enable the use of beamforming.
  • RACH is generally used for initial connection to a cell.
  • the MAC layer belonging to L2 provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
  • RLC radio link control
  • the MAC layer provides a mapping function from a plurality of logical channels to a plurality of transport channels.
  • the MAC layer also provides a logical channel multiplexing function by mapping from multiple logical channels to a single transport channel.
  • the MAC sublayer provides data transfer services on logical channels.
  • the logical channel may be divided into a control channel for information transmission in the control plane and a traffic channel for information transmission in the user plane according to the type of information to be transmitted. That is, a set of logical channel types is defined for other data transfer services provided by the MAC layer.
  • the logical channel is located above the transport channel and mapped to the transport channel.
  • the control channel is used only for conveying information in the control plane.
  • the control channel provided by the MAC layer includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a dedicated control channel (DCCH).
  • BCCH is a downlink channel for broadcasting system control information.
  • PCCH is a downlink channel used for transmitting paging information and paging a terminal whose cell-level location is not known to the network.
  • CCCH is used by the terminal when there is no RRC connection with the network.
  • MCCH is a one-to-many downlink channel used to transmit MBMS control information from the network to the terminal.
  • DCCH is a one-to-one bidirectional channel used by the terminal for transmitting dedicated control information between the terminal and the network in an RRC connection state.
  • the traffic channel is used only for conveying information in the user plane.
  • the traffic channel provided by the MAC layer includes a dedicated traffic channel (DTCH) and a multicast traffic channel (MTCH).
  • DTCH is used for transmission of user information of one UE in a one-to-one channel and may exist in both uplink and downlink.
  • MTCH is a one-to-many downlink channel for transmitting traffic data from the network to the terminal.
  • the uplink connection between the logical channel and the transport channel includes a DCCH that can be mapped to the UL-SCH, a DTCH that can be mapped to the UL-SCH, and a CCCH that can be mapped to the UL-SCH.
  • the downlink connection between the logical channel and the transport channel is a BCCH that can be mapped to a BCH or DL-SCH, a PCCH that can be mapped to a PCH, a DCCH that can be mapped to a DL-SCH, a DTCH that can be mapped to a DL-SCH, MCCH that can be mapped to MCH and MTCH that can be mapped to MCH.
  • the RLC layer belongs to L2.
  • the function of the RLC layer includes adjusting the size of the data by segmentation / concatenation of the data received from the upper layer in the radio section such that the lower layer is suitable for transmitting data.
  • the RLC layer is divided into three modes: transparent mode (TM), unacknowledged mode (UM) and acknowledged mode (AM). Provides three modes of operation.
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • AM RLC provides retransmission through automatic repeat request (ARQ) for reliable data transmission.
  • ARQ automatic repeat request
  • the function of the RLC layer may be implemented as a functional block inside the MAC layer, in which case the RLC layer may not exist.
  • the packet data convergence protocol (PDCP) layer belongs to L2.
  • the PDCP layer introduces an IP packet, such as IPv4 or IPv6, over a relatively low bandwidth air interface to provide header compression that reduces unnecessary control information so that the transmitted data is transmitted efficiently. Header compression improves transmission efficiency in the wireless section by transmitting only the information necessary for the header of the data.
  • the PDCP layer provides security. Security functions include encryption to prevent third party inspection and integrity protection to prevent third party data manipulation.
  • the radio resource control (RRC) layer belongs to L3.
  • the RRC layer at the bottom of L3 is defined only in the control plane.
  • the RRC layer serves to control radio resources between the terminal and the network.
  • the UE and the network exchange RRC messages through the RRC layer.
  • the RRC layer is responsible for the control of logical channels, transport channels and physical channels in connection with the configuration, re-configuration and release of RBs.
  • RB is a logical path provided by L1 and L2 for data transmission between the terminal and the network. That is, RB means a service provided by L2 for data transmission between the UE and the E-UTRAN. Setting up an RB means defining the characteristics of the radio protocol layer and channel to provide a particular service, and determining each specific parameter and method of operation.
  • RBs may be classified into two types: signaling RBs (SRBs) and data RBs (DRBs).
  • SRBs signaling RBs
  • DRBs data RBs
  • the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • the RLC and MAC layers may perform functions such as scheduling, ARQ and HARQ.
  • the RRC layer (ended at the eNB at the network side) may perform functions such as broadcast, paging, RRC connection management, RB control, mobility function, and UE measurement report / control.
  • the NAS control protocol (terminated at the gateway's MME at the network side) may perform functions such as SAE bearer management, authentication, LTE_IDLE mobility handling, paging initiation at LTE_IDLE, and security control for signaling between the terminal and the gateway.
  • the RLC and MAC layer may perform the same function as the function in the control plane.
  • the PDCP layer may perform user plane functions such as header compression, integrity protection and encryption.
  • the RRC state indicates whether the RRC layer of the UE is logically connected with the RRC layer of the E-UTRAN.
  • the RRC state may be divided into two types, such as an RRC connected state (RRC_CONNECTED) and an RRC idle state (RRC_IDLE).
  • RRC_CONNECTED RRC connected state
  • RRC_IDLE RRC idle state
  • the E-UTRAN cannot grasp the terminal of the RRC_IDLE, and manages the terminal in units of a tracking area in which a core network (CN) is larger than a cell. That is, the terminal of the RRC_IDLE is only identified as a unit of a larger area, and in order to receive a normal mobile communication service such as voice or data communication, the terminal must transition to RRC_CONNECTED.
  • CN core network
  • the terminal may receive a broadcast of system information and paging information.
  • the terminal may be assigned an identification (ID) that uniquely designates the terminal in the tracking area, and perform public land mobile network (PLMN) selection and cell reselection.
  • ID an identification
  • PLMN public land mobile network
  • the UE may have an E-UTRAN RRC connection and an RRC context in the E-UTRAN to transmit data to the eNB and / or receive data from the eNB.
  • the terminal may report channel quality information and feedback information to the eNB.
  • the E-UTRAN may know the cell to which the UE belongs. Therefore, the network may transmit data to the terminal and / or receive data from the terminal, and the network may inter-RAT with a GSM EDGE radio access network (GERAN) through mobility of the terminal (handover and network assisted cell change (NACC)). radio access technology (cell change indication), and the network may perform cell measurement for a neighboring cell.
  • GSM EDGE radio access network GERAN
  • NACC network assisted cell change
  • the UE designates a paging DRX cycle.
  • the UE monitors a paging signal at a specific paging occasion for each UE specific paging DRX cycle.
  • Paging opportunity is the time interval during which the paging signal is transmitted.
  • the terminal has its own paging opportunity.
  • the paging message is sent across all cells belonging to the same tracking area. If the terminal moves from one tracking area to another tracking area, the terminal sends a tracking area update (TAU) message to the network to update the location.
  • TAU tracking area update
  • the terminal When the user first turns on the power of the terminal, the terminal first searches for an appropriate cell and then stays in RRC_IDLE in that cell. When it is necessary to establish an RRC connection, the terminal staying in the RRC_IDLE may make an RRC connection with the RRC of the E-UTRAN through the RRC connection procedure and may transition to the RRC_CONNECTED. The UE staying in RRC_IDLE needs to establish an RRC connection with the E-UTRAN when uplink data transmission is necessary due to a user's call attempt or when a paging message is received from the E-UTRAN and a response message is required. Can be.
  • EMM-REGISTERED EPS Mobility Management-REGISTERED
  • EMM-DEREGISTERED EMM-DEREGISTERED
  • the initial terminal is in the EMM-DEREGISTERED state, and the terminal performs a process of registering with the corresponding network through an initial attach procedure to access the network. If the attach procedure is successfully performed, the UE and the MME are in the EMM-REGISTERED state.
  • an EPS Connection Management (ECM) -IDLE state In order to manage a signaling connection between the UE and the EPC, two states are defined, an EPS Connection Management (ECM) -IDLE state and an ECM-CONNECTED state, and these two states are applied to the UE and the MME.
  • ECM EPS Connection Management
  • ECM-IDLE state When the UE in the ECM-IDLE state establishes an RRC connection with the E-UTRAN, the UE is in the ECM-CONNECTED state.
  • the MME in the ECM-IDLE state becomes the ECM-CONNECTED state when it establishes an S1 connection with the E-UTRAN.
  • the E-UTRAN does not have the context information of the terminal.
  • the UE in the ECM-IDLE state performs a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
  • a terminal-based mobility related procedure such as cell selection or cell reselection without receiving a command from the network.
  • the terminal when the terminal is in the ECM-CONNECTED state, the mobility of the terminal is managed by the command of the network.
  • the terminal In the ECM-IDLE state, if the position of the terminal is different from the position known by the network, the terminal informs the network of the corresponding position of the terminal through a tracking area update procedure.
  • EPC Evolved Packet Core
  • MME mobility management entity
  • S-GW serving gateway
  • P-GW packet data network gateway
  • 5G core network or NextGen core network
  • functions, reference points, protocols, etc. are defined for each network function (NF). That is, 5G core network does not define functions, reference points, protocols, etc. for each entity.
  • the 5G system structure includes one or more UEs 10, a Next Generation-Radio Access Network (NG-RAN), and a Next Generation Core (NGC).
  • NG-RAN Next Generation-Radio Access Network
  • NNC Next Generation Core
  • the NG-RAN may include one or more gNBs 40, and a plurality of terminals may exist in one cell.
  • the gNB 40 provides the terminal with the control plane and the end point of the user plane.
  • the gNB 40 generally refers to a fixed station communicating with the terminal 10 and may be referred to as other terms such as a base station (BS), a base transceiver system (BTS), an access point, and the like.
  • BS base station
  • BTS base transceiver system
  • One gNB 40 may be arranged per cell. There may be one or more cells within coverage of the gNB 40.
  • the NGC may include an Access and Mobility Function (AMF) and a Session Management Function (SMF) that are responsible for the functions of the control plane.
  • AMF Access and Mobility Function
  • SMF Session Management Function
  • the AMF may be responsible for the mobility management function
  • the SMF may be responsible for the session management function.
  • the NGC may include a user plane function (UPF) that is responsible for the function of the user plane.
  • UPF user plane function
  • Terminal 10 and gNB 40 may be connected by an NG3 interface.
  • the gNBs 40 may be interconnected by Xn interface.
  • Neighboring gNBs 40 may have a mesh network structure with an Xn interface.
  • the gNBs 40 may be connected to the NGC by the NG interface.
  • the gNBs 40 may be connected to the AMF by the NG-C interface and may be connected to the UPF by the NG-U interface.
  • the NG interface supports a many-to-many-relation between gNB 40 and MME / UPF 50.
  • the gNB host may determine functions for radio resource management, IP header compression and encryption of user data stream, and routing to AMF from information provided by the terminal. Selection of an AMF at UE attachment when no routing to an AMF can be determined from the information provided by the UE, Routing of User Plane data to one or more UPFs towards UPF (s)), Scheduling and transmission of paging messages (originated from the AMF), transmission and scheduling of system broadcast information (derived from AMF or O & M) Scheduling and transmission of system broadcast information (originated from the AMF or O & M), or setting up and measuring measurement reports for scheduling and mobility (Me It can perform functions such as asurement and measurement reporting configuration for mobility and scheduling.
  • Access and Mobility Function (AMF) hosts can be used for NAS signaling termination, NAS signaling security, AS Security control, and inter CN node signaling for mobility between 3GPP access networks.
  • node signaling for mobility between 3GPP access networks IDLE mode UE reachability (including control and execution of paging retransmission), UE in ACTIVE mode and IDLE mode Tracking Area list management (for UE in idle and active mode), AMF selection for handovers with AMF change, Access Authentication, Or perform key functions such as access authorization including check of roaming rights.
  • a user plane function (UPF) host is an anchor point for Intra- / Inter-RAT mobility (when applicable), an external PDU session point for the interconnection to the data network (if applicable).
  • (External PDU session point of interconnect to Data Network) Packet routing & forwarding, Packet inspection and User plane part of Policy rule enforcement, Traffic usage reporting ( Traffic usage reporting, Uplink classifier to support routing traffic flows to a data network, Branching point to support multi- homed PDU session, QoS handling for the user plane, e.g.
  • packet filtering gating, QoS handling for user plane, eg packet filtering, gating, UL / DL rate enforcement, uplink traffic verification (SDF to QoS flow mapping), transport level packet marking in downlink and uplink It can perform main functions such as packet marking in the uplink and downlink, or downlink packet buffering and downlink data notification triggering.
  • QoS handling for user plane eg packet filtering, gating, UL / DL rate enforcement, uplink traffic verification (SDF to QoS flow mapping), transport level packet marking in downlink and uplink
  • SDF to QoS flow mapping uplink traffic verification
  • transport level packet marking in downlink and uplink It can perform main functions such as packet marking in the uplink and downlink, or downlink packet buffering and downlink data notification triggering.
  • the Session Management Function (SMF) host is responsible for session management, UE IP address allocation and management, selection and control of UP functions, and traffic to the appropriate destinations.
  • Configure traffic steering at UPF to route traffic to proper destination, control part of policy enforcement and QoS, or downlink data notification Can perform key functions such as
  • the terminal and the network may support user plane EPS optimization.
  • the user plane EPS optimization function may enable delivery of user plane data without having to use a service request procedure to set an access stratum (AS) context at a serving base station and a terminal.
  • AS access stratum
  • the base station may suspend the RRC connection.
  • the RRC connection may be temporarily suspended.
  • the terminal transitioned to ECM_IDLE can store the AS information
  • the base station can store the bearer context, S1AP association and AS information for the terminal
  • the MME is the bearer context and Save the S1AP association and enter the ECM_IDLE state.
  • the base station may resume the RRC connection.
  • the RRC connection may be resumed through an RRC connection resume procedure.
  • the terminal can resume connection with the network using the stored AS information during the RRC connection suspend procedure, and the base station informs the MME that the MME enters ECM_CONNECTED and the connection with the terminal is securely resumed. You can notify.
  • the terminal may trigger an RRC resume procedure to resume the ECM connection.
  • FIG. 5 illustrates a procedure of resuming ECM connection when the terminal and the network support user plane EPS optimization.
  • the terminal may trigger a random access procedure to the base station.
  • the terminal may trigger an RRC connection resumption procedure including information required by the base station to access the stored AS context of the terminal.
  • E-UTRAN may perform a security check.
  • the base station may provide the terminal with a list of resumed radio bearers.
  • EPS bearer state synchronization may be performed between the UE and the network. If the radio bearer for the default EPS bearer is not configured, the terminal should locally deactivate all the EPS bearers associated with the default EPS bearer.
  • the base station may notify the MME that the RRC connection of the terminal has been resumed in the S1-AP UE context resumption request message including a list of the rejected EPS bearer.
  • the MME may enter the ECM_CONNECTED state.
  • the MME may identify that the terminal returns from the base station storing the data related to the S1AP association, the bearer context including the DL TEID, and the UE context.
  • the MME may release the unlicensed and non-established bearers by triggering a bearer release procedure.
  • the MME may confirm the resumption of the connection in the S1-AP UE context resume response message including the list of rejected EPS bearers.
  • the base station may reset the radio bearer.
  • step S560 uplink data from the terminal may be delivered to the serving GW by the base station.
  • the MME may transmit a Modify Bearer Request message to the serving GW for each PDN connection.
  • the serving GW may send a Modify Bearer Response message to the MME in response to the Modified Bearer Request message.
  • the base station may determine whether the RRC connection can be resumed in step S520. If the RRC connection can be resumed, the base station may transmit a UE context resume request message to the MME in step S530. In addition, if the terminal has a NAS message to be transmitted, the terminal may transmit the NAS message to the base station using the RRC connection resumption completion message. After the UE context resumption request message is transmitted, the base station may deliver the received NAS message to the MME using an uplink NAS transport message.
  • the MME may respond to the base station with a UE context resume failure message before receiving the NAS message from the base station. For example, because the MME cannot initiate a single E-RAB, the MME may send a UE context resume failure message to the base station before receiving the NAS message from the base station. If the base station receives a UE context resume failure message from the MME, the base station may release the RRC connection and release all associated signaling and user data transfer resources. Therefore, the MME may not receive the NAS message transmitted by the terminal. Therefore, even if UE context resumption fails, a procedure to enable the MME to receive NAS messages needs to be newly proposed.
  • FIG. 6 illustrates a procedure of delivering a NAS message to an MME based on an indicator according to an embodiment of the present invention.
  • the terminal may have a NAS message to be transmitted.
  • the terminal may be in the ECM_IDLE mode due to a suspend indication, and the RRC connection may be in a suspended state.
  • the terminal may transmit a NAS message present indicator indicating that there is a NAS message to be transmitted to the base station.
  • the NAS presence indicator may be transmitted to the base station using an RRC connection resume message or an RRC connection resume complete message.
  • the terminal may transmit a NAS message to the base station.
  • the NAS message may be sent to the base station with the NAS message present indicator.
  • the NAS message may be sent to the base station separately from the NAS message present indicator.
  • the base station may deliver a NAS message present indicator to the MME / AMF.
  • the NAS message existence indicator may be included in the UE context resumption request message and transmitted to the MME / AMF.
  • the NAS message existence indicator may be delivered to the MME / AMF after the base station receives the NAS message from the terminal.
  • the NAS message presence indicator may be delivered to the MME / AMF before the base station receives the NAS message from the terminal.
  • the MME / AMF receiving the NAS message present indicator may wait until the NAS message arrives.
  • the MME / AMF receiving the NAS message presence indicator may start a timer, and the MME / AMF may not send a response message to the base station to the UE context resume request message until the timer expires. .
  • the MME / AMF responds to the UE context resume request message The message may be sent to the base station.
  • the MME / AMF may receive a NAS message from the base station.
  • the MME / AMF transmits a UE context resumption failure message to the base station in response to the UE context resumption request message, and thus the base station establishes an RRC connection.
  • the MME / AMF may not receive the NAS message.
  • FIG. 7 illustrates a procedure of delivering a NAS message to an MME based on an indicator according to an embodiment of the present invention.
  • step S700 the UE may be in ECM_IDLE mode due to a suspend indication. And, the RRC connection may be in a suspended state.
  • the NAS of the terminal may request the lower layer to resume the RRC connection.
  • the lower layer may mean an AS of the terminal.
  • the NAS of the terminal may provide the RRC establishment cause and call type to the lower layer.
  • the NAS of the terminal may provide an indication to the lower layer whether the initial NAS message is a service request message or different from the service request message.
  • the terminal may transmit a random access preamble (Random Access Preamble) to the base station.
  • a random access preamble Random Access Preamble
  • the base station may respond to the terminal in a random access response (Random Access Response).
  • the terminal may transmit an RRC connection resumption request message to the base station.
  • the RRC connection resume request message may include an indicator indicating that there is a NAS message to be transmitted.
  • the RRC connection resume request message may not include an indicator indicating that there is a NAS message to be transmitted. If the base station receives the indicator, the base station may postpone sending the UE context resume request message to the MME until a NAS message is provided in the RRC connection resume complete message.
  • step S705 the base station may respond to the terminal in the RRC connection resume message.
  • the terminal may transmit a NAS message to the base station.
  • the NAS message may be transmitted using an RRC connection resumption completion message.
  • the RRC connection resume complete message may include an indicator indicating that there is a NAS message to be transmitted.
  • the indicator may be transmitted from the terminal to the base station through at least one of step S704 or step S706.
  • step S707 if an indicator indicating that there is a NAS message to be transmitted is received in step S704 or step S706, the base station may transmit a UE context resume request message including the received indicator to the MME / AMF.
  • the MME / AMF may start a timer with a default value.
  • the timer may be a newly defined timer to indicate the time to wait until the MME / AMF receives the NAS message.
  • the timer may be stopped when the MME / AMF receives a NAS message.
  • the MME / AMF may then wait until the indicated NAS message arrives.
  • the MME / AMF may not transmit the UE context resume response message or the UE context resume failure message until it sends a response to the NAS message to be received.
  • the MME / AMF may not transmit a UE context resume response message or a UE context resume failure message until the timer expires. Therefore, even though there is a NAS message transmitted from the terminal, the MME / AMF transmits the UE context resumption failure message to the base station, the base station releases the RRC connection, so that the MME / AMF does not receive the NAS message Can be solved.
  • step S709 when the base station receives the NAS message in step S706, the base station may deliver the NAS message to the MME / AMF.
  • the NAS message may be delivered using an uplink NAS forwarding message.
  • step S710 if the MME / AMF receives the NAS message while the timer is running, the MME / AMF may stop the timer and send a response message to the received NAS message using the downlink NAS forwarding message. have. If the timer expires and the MME / AMF does not receive the NAS message, steps S710 to S711 may be omitted.
  • the base station may deliver a NAS message received from the MME / AMF to the terminal.
  • the NAS message may be delivered using a DL information delivery message.
  • the MME / AMF may send a UE context resume response message or a UE context resume failure message to the base station.
  • the base station may transmit an RRC connection reconfiguration message or RRC connection release message to the terminal. Specifically, when the base station receives the UE context resume response message from the MME / AMF, the base station may transmit an RRC connection reconfiguration message to the terminal. When the base station receives the UE context resumption failure message from the MME / AMF, the base station may transmit an RRC connection release message to the terminal.
  • step S714 if the MME / AMF sends a UE context resume response message in step S712, the MME / AMF may modify the bearer with the S-GW / UPF.
  • FIG. 8 illustrates a procedure of delivering a NAS message to an MME based on an indicator according to an embodiment of the present invention.
  • step S800 the terminal may be in the ECM_IDLE mode due to a suspend indication. And, the RRC connection may be in a suspended state.
  • the NAS of the terminal may request a lower layer to resume the RRC connection.
  • the lower layer may mean an AS of the terminal.
  • the NAS of the terminal may provide the RRC establishment cause and call type to the lower layer.
  • the NAS of the terminal may provide an indication to the lower layer whether the initial NAS message is a service request message or different from the service request message.
  • the terminal may transmit a random access preamble to the base station.
  • the base station may respond to the terminal in a random access response (Random Access Response).
  • the terminal may transmit an RRC connection resumption request message to the base station.
  • the RRC connection resume request message may include an indicator indicating that there is a NAS message to be transmitted.
  • the RRC connection resumption request message may include an indicator indicating that there is a NAS message to be transmitted. Otherwise, the RRC connection resume request message may not include an indicator indicating that there is a NAS message to be transmitted.
  • step S805 if an indicator indicating that there is a NAS message to be transmitted is received in step S804, the base station may transmit a UE context resume request message including the received indicator to the MME / AMF.
  • the MME / AMF may start a timer having a default value.
  • the timer may be a newly defined timer to indicate the time to wait until the MME / AMF receives the NAS message.
  • the timer may be stopped when the MME / AMF receives a NAS message.
  • the MME / AMF may then wait until the indicated NAS message arrives.
  • the MME / AMF may not transmit the UE context resume response message or the UE context resume failure message until it sends a response to the NAS message to be received.
  • the MME / AMF may not transmit a UE context resume response message or a UE context resume failure message until the timer expires. Therefore, even though there is a NAS message transmitted from the terminal, the MME / AMF transmits the UE context resumption failure message to the base station, the base station releases the RRC connection, so that the MME / AMF does not receive the NAS message Can be solved.
  • the base station may respond to the terminal in the RRC connection resume message.
  • the terminal may transmit a NAS message to the base station.
  • the NAS message may be transmitted using an RRC connection resumption completion message.
  • step S809 when the base station receives the NAS message in step S808, the base station may deliver the NAS message to the MME / AMF.
  • the NAS message may be delivered using an uplink NAS forwarding message.
  • step S810 if the MME / AMF receives the NAS message while the timer is running, the MME / AMF may stop the timer and transmit a response message to the received NAS message using the downlink NAS forwarding message. have. If the timer expires and the MME / AMF does not receive a NAS message, steps S810 to S811 may be omitted.
  • the base station may deliver a NAS message received from the MME / AMF to the terminal.
  • the NAS message may be delivered using a DL information delivery message.
  • the MME / AMF may transmit a UE context resume response message or a UE context resume failure message to the base station.
  • the base station may transmit an RRC connection reconfiguration message or an RRC connection release message to the terminal according to the message received from the MME / AMF. Specifically, when the base station receives the UE context resume response message from the MME / AMF, the base station may transmit an RRC connection reconfiguration message to the terminal. When the base station receives the UE context resumption failure message from the MME / AMF, the base station may transmit an RRC connection release message to the terminal.
  • step S814 if the MME / AMF transmits the UE context resume response message in step S812, the MME / AMF may modify the bearer with the S-GW / UPF.
  • FIG. 9 is a block diagram illustrating a method for transmitting a NAS message by a base station according to an embodiment of the present invention.
  • the base station may receive an indicator from the terminal indicating that there is a NAS message to be transmitted.
  • the indicator may be included in an RRC Connection Resume Request message and received from the terminal.
  • the indicator may be included in an RRC Connection Resume Complete message and received from the terminal.
  • the base station may transmit a UE context resume request message including the indicator to the MME. If the UE context resume request message includes the indicator, transmission of the message corresponding to the UE context resume request message may be interrupted by the MME until the MME receives a NAS message from the base station.
  • the message corresponding to the UE context resumption request message may be either a UE context resume response message or a UE context resume failure message.
  • the MME may be an access and mobility function (AMF).
  • FIG. 10 is a block diagram illustrating a method of receiving an NAS message by an MME according to an embodiment of the present invention.
  • the MME may receive a UE context resume request message (UE Context Resume Request message) including an indicator indicating that there is a NAS message to be transmitted from the base station.
  • UE Context Resume Request message UE Context Resume Request message
  • the MME may stop transmitting the message corresponding to the UE context resumption request message. If the UE context resume request message includes the indicator, transmission of the message corresponding to the UE context resume request message may be stopped until the MME receives the NAS message from the base station.
  • the MME may receive the NAS message from the base station. If the NAS message is received from the base station, the MME may initiate transmission of a message corresponding to the suspended UE context resume request message.
  • the MME may start a timer.
  • the transmission of the message corresponding to the UE context resume request message may be suspended until the started timer expires.
  • the MME may initiate transmission of a message corresponding to the suspended UE context resume request message.
  • the message corresponding to the UE context resumption request message may be either a UE context resume response message or a UE context resume failure message.
  • FIG. 11 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
  • the terminal 1100 includes a processor 1101, a memory 1102, and a transceiver 1103.
  • the memory 1102 is connected to the processor 1101 and stores various information for driving the processor 1101.
  • the transceiver 1103 is connected to the processor 1101 and transmits and / or receives a radio signal.
  • the processor 1101 implements the proposed functions, processes and / or methods. In the above-described embodiment, the operation of the terminal may be implemented by the processor 1101.
  • the base station 1110 includes a processor 1111, a memory 1112, and a transceiver 1113.
  • the memory 1112 is connected to the processor 1111 and stores various information for driving the processor 1111.
  • the transceiver 1113 is connected to the processor 1111 to transmit and / or receive a radio signal.
  • Processor 1111 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the base station may be implemented by the processor 1111.
  • the MME / AMF 1120 includes a processor 1121, a memory 1122, and a transceiver 1123.
  • the memory 1122 is connected to the processor 1121 and stores various information for driving the processor 1121.
  • the transceiver 1123 is connected to the processor 1121 and transmits and / or receives a radio signal.
  • Processor 1121 implements the proposed functions, processes, and / or methods. In the above-described embodiment, the operation of the MME / AMF may be implemented by the processor 1121.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the transceiver may include baseband circuitry for processing wireless signals.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé selon lequel une station de base émet un message NAS (message de strate de non accès), et un dispositif réalisant le procédé dans un système de communication sans fil. Le procédé peut comprendre : une étape de réception, depuis un terminal, d'un indicateur pour indiquer qu'il y a un message NAS à émettre ; et une étape d'émission, à une entité de gestion de mobilité (MME), d'un message de demande de reprise de contexte d'UE comprenant l'indicateur.
PCT/KR2017/007936 2016-07-22 2017-07-24 Procédé et dispositif d'émission/réception de message nas Ceased WO2018016927A1 (fr)

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CN110138885B (zh) * 2018-02-02 2021-09-14 华为技术有限公司 地址分配方法及装置
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CN113347700A (zh) * 2020-02-14 2021-09-03 大唐移动通信设备有限公司 一种终端能力匹配的检查方法、amf、基站和存储介质
CN113347700B (zh) * 2020-02-14 2023-01-20 大唐移动通信设备有限公司 一种终端能力匹配的检查方法、amf、基站和存储介质
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