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WO2016140403A1 - Procédé et dispositif pour une connexion rrc d'un terminal dans un système de communication sans fil - Google Patents

Procédé et dispositif pour une connexion rrc d'un terminal dans un système de communication sans fil Download PDF

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Publication number
WO2016140403A1
WO2016140403A1 PCT/KR2015/006092 KR2015006092W WO2016140403A1 WO 2016140403 A1 WO2016140403 A1 WO 2016140403A1 KR 2015006092 W KR2015006092 W KR 2015006092W WO 2016140403 A1 WO2016140403 A1 WO 2016140403A1
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WO
WIPO (PCT)
Prior art keywords
message
mme
rrc connection
terminal
information
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PCT/KR2015/006092
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English (en)
Korean (ko)
Inventor
조희정
한진백
이은종
변일무
Original Assignee
엘지전자(주)
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Publication of WO2016140403A1 publication Critical patent/WO2016140403A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/047—Key management, e.g. using generic bootstrapping architecture [GBA] without using a trusted network node as an anchor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H04W12/062—Pre-authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
    • H04W12/041—Key generation or derivation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for supporting a method for quickly setting up a security and data session by switching a terminal in an idle state to a connected state and a device for supporting the same.
  • Mobile communication systems have been developed to provide voice services while ensuring user activity.
  • the mobile communication system has expanded not only voice but also data service.
  • the explosive increase in traffic causes shortage of resources and the demand for faster services. Therefore, a more advanced mobile communication system is required. have.
  • An object of the present invention is to provide an RRC connection method in a wireless communication system.
  • Another object of the present invention is to provide a method for switching an idle state terminal to a connected state in a wireless communication system.
  • Another object of the present invention is to provide a method for setting a context for a terminal requiring low delay data communication in a wireless communication system in advance.
  • Another object of the present invention is to provide a method in which a low delay terminal in an idle state in a wireless communication system establishes a security and data session faster than a general terminal.
  • the present invention provides an RRC connection method and apparatus of a terminal in a wireless communication system to solve the above problems.
  • a method for cell selection includes the steps of receiving system information from a base station; Transmitting an RRC connection request message including an MME ID field indicating a MME (Mobility Management Entity) previously connected with the terminal to the base station based on the system information; Receiving an RRC connection setup message in response to the RRC connection request message; And performing security setting and data connection setting with the base station, wherein the MME is an MME corresponding to an identifier or a code included in the MME ID field.
  • MME Mobility Management Entity
  • the RRC connection request message characterized in that it further comprises a cause (cause) field indicating that the RRC connection request for the low delay service.
  • the MME ID field is a PLMN ID (Public Land Mobile Network Identifier) indicating an operator network identification number, an MME Group Identifier (MMEGI) indicating an MME group identifier or an MMEC (MME Code) indicating an MME code identifier. It characterized in that it comprises at least one of.
  • PLMN ID Public Land Mobile Network Identifier
  • MMEGI MME Group Identifier
  • MME Code MME Code
  • the performing of the security setting and the data connection setting may include: receiving a security mode command message from the base station for the security setting; Transmitting a security mode complete message to the base station in response to the security mode command message;
  • the RRC connection reconfiguration message characterized in that generated before the step of the terminal transmits a control and data connection request (e.g., service request) with the MME to the base station.
  • a control and data connection request e.g., service request
  • the RRC connection reconfiguration message characterized in that generated before the step of receiving the security mode command message.
  • the step of receiving the security mode command message characterized in that performed before the base station transmits a control message for the control and data connection of the terminal to the MME.
  • the performing of the security setting and the data connection setting may include receiving a control message including security mode command information and RRC connection reconfiguration information from the serving base station for the security setting and data connection setting. ; And transmitting a response message to the serving base station in response to the control message.
  • control message characterized in that generated before the step of receiving the RRC connection setup message based on the context information.
  • the present invention comprises the steps of transmitting system information (System Information) to the terminal; Receiving an RRC Connection Request message including an MME ID field indicating a MME (Mobility Management Entity) previously connected with the terminal from the terminal based on the system information; Transmitting a request message for requesting context information of the terminal to an MME corresponding to an identifier or a code included in the MME ID field; Transmitting an RRC connection setup message to the terminal in response to the RRC connection request message; Receiving a response message including the context information from the MME in response to the request message; It provides a method comprising the step of performing security settings and data connection settings with the terminal based on the context information.
  • System Information System Information
  • the RRC connection request message characterized in that it further comprises a cause (cause) field indicating that the RRC connection request for the low delay service.
  • the context information may include at least one of information related to data connection setting with the terminal or information related to security setting.
  • the MME ID field is a PLMN ID (Public Land Mobile Network Identifier) indicating an operator network identification number, an MME Group Identifier (MMEGI) indicating an MME group identifier or an MMEC (MME Code) indicating an MME code identifier. It characterized in that it comprises at least one of.
  • PLMN ID Public Land Mobile Network Identifier
  • MMEGI MME Group Identifier
  • MME Code MME Code
  • the performing of the security setting and the data connection setting may include: transmitting a security mode command message for the security setting to the terminal based on the context information; Transmitting a control message including authentication information of the terminal to the MME; Receiving a security mode complete message in response to the security mode command message from the terminal; Receiving an authentication result message including authentication result information indicating whether to permit access determined based on the authentication information from the MME; Transmitting an RRC connection reconfiguration message to the terminal to perform the data connection configuration based on the context information; And receiving an RRC connection reconfiguration complete message from the terminal in response to the RRC connection reconfiguration message.
  • the RRC connection reconfiguration message characterized in that generated before the step of transmitting the security mode command (Security mode Command) message based on the context information.
  • the transmitting of the secure mode command message may be performed before the transmitting of the RRC connection reconfiguration message based on the context information.
  • the authentication information is a key set identifier (KSI) indicating information identifying a security key, message authentication code (Message Authentication Code) information indicating information related to a code for message authentication or the message authentication code And at least one of sequence number information representing information related to a number for generation.
  • KKI key set identifier
  • message authentication code Message Authentication Code
  • the performing of the security setting and the data connection setting may include: transmitting a security mode command message to the terminal for the security setting based on the context information; Receiving a security mode complete message including a security key from the terminal in response to the security mode command message; Transmitting an RRC connection reconfiguration message to the terminal to perform the data connection configuration based on the context information; And receiving an RRC connection reconfiguration complete message from the terminal in response to the RRC connection reconfiguration message, wherein the base station receives a message for verifying suitability of the terminal transmitted from the terminal. It is characterized by determining the suitability of the terminal based on the authentication code.
  • the communication unit for transmitting and receiving a wireless signal with the outside; And a processor that is functionally coupled to the communication unit, wherein the processor receives system information from a base station and based on the system information, the base station previously connected with the terminal to the base station. Transmits an RRC Connection Request message including an MME ID field indicating an entity, receives an RRC Connection Setup message in response to the RRC connection request message, and sets up security with the base station; And controlling to perform data connection setup, wherein the MME is an MME corresponding to an identifier or a code included in the MME ID field.
  • the communication unit for transmitting and receiving a wireless signal with the outside; And a processor that is functionally coupled to the communication unit, wherein the processor transmits system information to the terminal, and has been previously connected to the terminal from the terminal based on the system information.
  • It provides a base station characterized in that the control to perform the security settings and data connection settings with the terminal based on the context information.
  • the present invention has the effect of reducing the transition time from the RRC idle state (Idle State) to the connected state (UE) of the terminal supporting a low latency (low latency) service.
  • the present invention has the effect of enabling a quick RRC (re) connection and reconfiguration by setting a context in advance for a terminal requiring low latency data communication.
  • the present invention by setting the context (Context) in advance, there is an effect that the low delay terminal in the idle state (Idle State) can establish a security and data session faster than the general terminal.
  • FIG. 1 is a diagram illustrating an example of an EPS (Evolved Packet System) related to an LTE system to which the present invention can be applied.
  • EPS Evolved Packet System
  • FIG. 2 shows a wireless communication system to which the present invention is applied.
  • FIG. 3 is a block diagram illustrating an example of a functional split between an E-UTRAN and an EPC to which the present invention can be applied.
  • FIG. 4 is a block diagram illustrating an example of a radio protocol architecture to which technical features of the present invention can be applied.
  • FIG. 5 is a diagram illustrating physical channels used in a 3GPP LTE / LTE-A system to which the present invention can be applied and a general signal transmission method using the same.
  • FIG. 6 shows a structure of a radio frame in 3GPP LTE / LTE-A to which the present invention can be applied.
  • FIG. 7 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
  • FIG. 8 is a flowchart illustrating a process of establishing an RRC connection to which the present invention can be applied.
  • NAS Non Access Stratum
  • FIG. 10 is a flowchart illustrating an initial context setup method to which the present invention can be applied.
  • FIG. 11 is a flowchart illustrating a method of initial security activation to which the present invention can be applied.
  • FIG. 12 is a flowchart illustrating a RRC connection resetting process to which the present invention can be applied.
  • FIG. 13 is a diagram illustrating an example of an RRC connection reestablishment procedure to which the present invention can be applied.
  • FIG. 14 is a flowchart illustrating a method of switching from an idle state to a connected state.
  • 15 is a flowchart illustrating an example of a method of switching from an idle state to a connected state to which the present invention can be applied.
  • 16 is a diagram illustrating an example of a method for generating a security key when switching to a connected state to which the present invention can be applied.
  • 17 is a flowchart illustrating still another example of a method of switching from an idle state to a connected state to which the present invention can be applied.
  • FIG. 18 is a flowchart illustrating still another example of a method of switching from an idle state to a connected state to which the present invention can be applied.
  • FIG. 19 is a diagram illustrating an example of an internal block diagram of a wireless device to which the present invention can be applied.
  • the messages, frames, signals, fields, and devices described herein are not limited to each name as being for explaining the present invention, and may be replaced with other messages, frames, signals, fields, and devices that perform the same function. .
  • a base station has a meaning as a terminal node of a network that directly communicates with a terminal.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a base station (BS) is a fixed station (Node B), an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), a macro eNB (MeNB), a SeNB (SeNB). Secondary eNB).
  • a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.
  • UE user equipment
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • 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
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA).
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink.
  • LTE-A (advanced) is the evolution of 3GPP LTE.
  • FIG. 1 is a diagram illustrating an example of an EPS (Evolved Packet System) related to an LTE system to which the present invention can be applied.
  • EPS Evolved Packet System
  • the LTE system aims to provide seamless Internet Protocol connectivity between a user equipment (UE) and a pack data network (PDN) while the user does not interfere with the end user's use of the application on the go. .
  • the LTE system completes the evolution of wireless access through the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), which defines a radio protocol architecture between the user terminal and the base station, which is an Evolved Packet Core (EPC) network. It is also achieved through evolution in non-wireless terms by the inclusion of System Architecture Evolution (SAE).
  • LTE and SAE include an Evolved Packet System (EPS).
  • EPS Evolved Packet System
  • the EPS uses the concept of EPS bearers to route IP traffic from the gateway to the user terminal in the PDN.
  • a bearer is an IP packet flow having a specific Quality of Service (QoS) between the gateway and the user terminal.
  • QoS Quality of Service
  • E-UTRAN and EPC both set up and release bearers required by the application.
  • EPC also called CN (core network)
  • CN core network
  • a node (logical or physical node) of an EPC of the SAE includes a mobility management entity (MME) 30, a PDN-GW or a PDN gateway (P-GW) 50, and an S-GW ( Serving Gateway (40), Policy and Charging Rules Function (PCRF) 60, Home Subscriber Server (HSS) 70, and the like.
  • MME mobility management entity
  • P-GW PDN gateway
  • S-GW Serving Gateway
  • PCRF Policy and Charging Rules Function
  • HSS Home Subscriber Server
  • the MME 30 is a control node that handles signaling between the UE 10 and the CN.
  • the protocol exchanged between the UE 10 and the CN is known as a Non-Access Stratum (NAS) protocol.
  • NAS Non-Access Stratum
  • Examples of functions supported by the MME 30 include functions related to bearer management operated by the session management layer in the NAS protocol, including network setup, management, and release of bearers, network and It is manipulated by a connection layer or a mobility management layer in the NAS protocol layer including the establishment of a connection and security between the UEs 10.
  • the MME 30 is an entity in which a function necessary for processing authentication and context information for a terminal is implemented, which has been described as an embodiment. Thus, other devices as well as the MME 30 may perform the corresponding function.
  • the S-GW 40 serves as a local mobility anchor for the data bearer when the UE 10 moves between base stations (eNodeBs) 20. All user IP packets are sent via the S-GW 40. Also, the S-GW 40 is in an idle state where the UE 10 is known as the ECM-IDLE state, and the MME 30 performs paging of the UE 10 to re-establish the bearer. Maintain information related to the bearer when temporarily buffering downlink data during initiation. It also serves as a mobility anchor for inter-working with other 3GPP technologies such as General Packet Radio Service (GRPS) and Universal Mobile Telecommunications System (UMTS).
  • GRPS General Packet Radio Service
  • UMTS Universal Mobile Telecommunications System
  • the S-GW 40 is an entity in which a function necessary for processing routing / forwarding of user data is implemented and described as an embodiment.
  • other devices as well as the S-GW 40 may perform the corresponding function.
  • the P-GW 50 performs IP address assignment for the UE and performs flow-based charging in accordance with QoS enforcement and rules from the PCRF 60.
  • the P-GW 50 performs QoS enforcement for GBR bearers (Guaranteed Bit Rate (GBR) bearers). It also serves as a mobility anchor for interworking with non-3GPP technologies such as CDMA2000 and WiMAX networks.
  • GBR bearers Guard Bit Rate (GBR) bearers
  • the P-GW 50 is an entity in which a function necessary for processing routing / forwarding of user data is implemented and described as an embodiment.
  • other devices as well as the P-GW 50 may perform the corresponding function.
  • the PCRF 60 performs policy control decision-making and performs flow-based charging.
  • the HSS 70 is also called a home location register (HLR) and includes SAE subscription data including information on EPS-subscribed QoS profiles and access control for roaming. It also includes information about the PDN that the user accesses. This information may be maintained in the form of an Access Point Name (APN), which is a Domain Name system (DNS) -based label that identifies the PDN address that represents the access point or subscribed IP address for the PDN.
  • API Access Point Name
  • DNS Domain Name system
  • various interfaces such as S1-U, S1-MME, S5 / S8, S11, S6a, Gx, Rx, and SG may be defined between EPS network elements.
  • Mobility Management is a procedure to reduce overhead on the E-UTRAN and processing at the UE.
  • MME mobility management
  • the UE can inform the network about the new location whenever it leaves the current tracking area (TA) so that the network can contact the UE in the ECM-IDLE state.
  • This procedure may be called “Tracking Area Update”, which may be called “Routing Area Update” in universal terrestrial radio access network (UTRAN) or GSM EDGE Radio Access Network (GERAN) system.
  • the MME performs the function of tracking the user's location while the UE is in the ECM-IDLE state.
  • the MME transmits a paging message to all base stations (eNodeBs) on the tracking area (TA) where the UE is registered.
  • eNodeBs base stations
  • TA tracking area
  • the base station then begins paging for the UE over a radio interface.
  • a procedure for causing the state of the UE to transition to the ECM-CONNECTED state is performed.
  • This procedure can be called a “Service Request Procedure”. Accordingly, information related to the UE is generated in the E-UTRAN, and all bearers are re-established.
  • the MME is responsible for resetting the radio bearer and updating the UE context on the base station.
  • a mobility management (MM) backoff timer may be further used.
  • the UE may transmit a tracking area update (TAU) to update the TA, and the MME may reject the TAU request due to core network congestion, in which case the MM backoff timer You can provide a time value.
  • the UE may activate the MM backoff timer.
  • TAU tracking area update
  • FIG. 2 shows a wireless communication system to which the present invention is applied.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
  • BS base station
  • UE user equipment
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to a Serving Gateway (S-GW) through a Mobility Management Entity (MME) and an S1-U through an Evolved Packet Core (EPC), more specifically, an S1-MME through an S1 interface.
  • S-GW Serving Gateway
  • MME Mobility Management Entity
  • EPC Evolved Packet Core
  • EPC consists of MME, S-GW and Packet Data Network Gateway (P-GW).
  • the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
  • S-GW is a gateway having an E-UTRAN as an endpoint
  • P-GW is a gateway having a PDN as an endpoint.
  • Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
  • L2 second layer
  • L3 third layer
  • the RRC Radio Resource Control
  • the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
  • FIG. 3 is a block diagram illustrating an example of a functional split between an E-UTRAN and an EPC to which the present invention can be applied.
  • hatched blocks represent radio protocol layers and empty blocks represent functional entities in the control plane.
  • the base station performs the following functions.
  • Radio resource management such as radio bearer control, radio admission control, connection mobility control, and dynamic resource allocation to a terminal RRM
  • IP Internet Protocol
  • IP Internet Protocol
  • Scheduling and transmission (5) scheduling and transmission of broadcast information, and (6) measurement and measurement report setup for mobility and scheduling.
  • the MME performs the following functions. (1) distribution of paging messages to base stations, (2) Security Control, (3) Idle State Mobility Control, (4) SAE Bearer Control, (5) NAS (Non-Access) Stratum) Ciphering and Integrity Protection of Signaling.
  • S-GW performs the following functions. (1) termination of user plane packets for paging, and (2) user plane switching to support terminal mobility.
  • FIG. 4 is a block diagram illustrating an example of a radio protocol architecture to which technical features of the present invention can be applied.
  • FIG. 4A illustrates an example of a radio protocol architecture for a user plane
  • FIG. 4B illustrates a radio protocol architecture for a control plane.
  • the user plane is a protocol stack for user data transmission
  • the control plane is a protocol stack for control signal transmission.
  • a physical layer (PHY) layer provides an information transfer service to a higher layer using a physical channel.
  • the physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data is moved between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted over the air interface.
  • MAC medium access control
  • the physical channel may be modulated by an orthogonal frequency division multiplexing (OFDM) scheme and utilizes time and frequency as radio resources.
  • OFDM orthogonal frequency division multiplexing
  • the function of the MAC layer is mapping between logical channels and transport channels and multiplexing / demultiplexing ('/') into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to the logical channels. Meaning includes both the concepts of 'or' and 'and').
  • the MAC layer provides a service to a Radio Link Control (RLC) layer through a logical channel.
  • RLC Radio Link Control
  • RLC layer Functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs.
  • QoS Quality of Service
  • the RLC layer has a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (Acknowledged Mode).
  • TM transparent mode
  • UM unacknowledged mode
  • Acknowledged Mode acknowledged mode
  • AM Three modes of operation (AM).
  • AM RLC provides error correction through an automatic repeat request (ARQ).
  • the RRC (Radio Resource Control) layer is defined only in the control plane.
  • the RRC layer is responsible for the control of logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
  • RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transmission between the terminal and the network.
  • PDCP Packet Data Convergence Protocol
  • Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering.
  • the functionality of the Packet Data Convergence Protocol (PDCP) layer in the control plane includes the transfer of control plane data and encryption / integrity protection.
  • the establishment of the RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method.
  • RB can be further divided into SRB (Signaling RB) and DRB (Data RB).
  • SRB is used as a path for transmitting RRC messages in the control plane
  • DRB is used as a path for transmitting user data in the user plane.
  • the UE If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise it is in an RRC idle state.
  • the downlink transmission channel for transmitting data from the network to the UE includes a BCH (Broadcast Channel) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages.
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH).
  • the uplink transport channel for transmitting data from the terminal to the network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.
  • RACH random access channel
  • SCH uplink shared channel
  • BCCH broadcast control channel
  • PCCH paging control channel
  • CCCH common control channel
  • MCCH multicast control channel
  • MTCH multicast traffic
  • the physical channel is composed of several OFDM symbols in the time domain and several sub-carriers in the frequency domain.
  • One sub-frame consists of a plurality of OFDM symbols in the time domain.
  • the RB is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of subcarriers.
  • each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for the physical downlink control channel (PDCCH), that is, the L1 / L2 control channel.
  • Transmission Time Interval is a unit time of subframe transmission.
  • FIG. 5 is a diagram illustrating physical channels used in a 3GPP LTE / LTE-A system to which the present invention can be applied and a general signal transmission method using the same.
  • the terminal In the state in which the power is turned off, the terminal is powered on again or enters a new cell, and performs an initial cell search operation such as synchronizing with the base station in step S501. To this end, the terminal receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell identifier (identifier). do.
  • P-SCH primary synchronization channel
  • S-SCH secondary synchronization channel
  • the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information in a cell. Meanwhile, the UE may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.
  • PBCH physical broadcast channel
  • DL RS downlink reference signal
  • the UE may acquire more specific system information by receiving the PDSCH according to the PDCCH and the PDCCH information in step S502.
  • the terminal may perform a random access procedure such as step S503 to step S506 to complete the access to the base station.
  • the UE may transmit a preamble through a physical random access channel (PRACH) (S503), and may receive a response message for the preamble through the PDCCH and the PDSCH corresponding thereto (S504).
  • PRACH physical random access channel
  • the UE may perform a contention resolution procedure such as transmitting an additional PRACH signal (S505) and receiving a PDCCH signal and a corresponding PDSCH signal (S506).
  • the UE can receive a PDCCH signal and / or a PDSCH signal (S507) and a physical uplink shared channel (PUSCH) signal and / or a physical uplink control channel as a general uplink / downlink signal transmission procedure.
  • the transmission of the (PUCCH) signal (S508) may be performed.
  • UCI uplink control information
  • HARQ-ACK / NACK scheduling request (SR), channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI) information, and the like.
  • SR scheduling request
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indicator
  • the UCI is generally transmitted periodically through the PUCCH, but may be transmitted through the PUSCH when control information and traffic data are to be transmitted at the same time.
  • the UCI may be aperiodically transmitted through the PUSCH by the request / instruction of the network.
  • FIG. 6 shows a structure of a radio frame in 3GPP LTE / LTE-A to which the present invention can be applied.
  • uplink / downlink data packet transmission is performed in subframe units, and one subframe is defined as a predetermined time interval including a plurality of OFDM symbols.
  • the 3GPP LTE / LTE-A standard supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).
  • FDD frequency division duplex
  • TDD time division duplex
  • uplink transmission and downlink transmission are performed while occupying different frequency bands.
  • uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
  • the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain.
  • the downlink channel response can be obtained from the uplink channel response.
  • the uplink transmission and the downlink transmission are time-divided in the entire frequency band, and thus the downlink transmission by the base station and the uplink transmission by the terminal cannot be simultaneously performed.
  • uplink transmission and downlink transmission are performed in different subframes.
  • the downlink radio frame consists of 10 subframes, and one subframe consists of two slots in the time domain.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms
  • one slot may have a length of 0.5 ms.
  • One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. Since 3GPP LTE / LTE-A uses OFDMA in downlink, the OFDM symbol is for representing one symbol period.
  • the OFDM symbol may be referred to as one SC-FDMA symbol or symbol period.
  • a resource block as a resource allocation unit includes a plurality of consecutive subcarriers in one slot.
  • the number of OFDM symbols included in one slot may vary depending on the configuration of a cyclic prefix (CP).
  • the CP has an extended CP and a normal CP.
  • the number of OFDM symbols included in one slot may be seven.
  • the OFDM symbol is configured by the extended cyclic prefix, the length of one OFDM symbol is increased, so the number of OFDM symbols included in one slot is smaller than that of the normal cyclic prefix.
  • the extended cyclic prefix for example, the number of OFDM symbols included in one slot may be six.
  • the extended cyclic prefix may be used to further reduce the interference between symbols.
  • one slot includes 7 OFDM symbols, so one subframe includes 14 OFDM symbols.
  • the first up to three OFDM symbols of each subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • Type 2 radio frames consist of two half frames, each half frame consists of five subframes, and one subframe consists of two slots.
  • a special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization or channel estimation at the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the structure of the radio frame described above is just one example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of symbols included in the slot may be variously changed.
  • FIG. 7 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
  • one downlink slot includes a plurality of OFDM symbols in the time domain.
  • one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
  • Each element on the resource grid is a resource element (RE), and one resource block includes 12 ⁇ 7 resource elements.
  • the number (NRB) of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 8 is a flowchart illustrating a process of establishing an RRC connection to which the present invention can be applied.
  • the RRC state refers to whether or not the RRC layer of the UE is in logical connection with the RRC layer of the E-UTRAN. If connected, the RRC layer is connected to the RRC connected state. It is called RRC Idle State. Since the UE in the RRC connected state has an RRC connection, the E-UTRAN can grasp the existence of the corresponding UE in a cell unit, and thus can effectively control the UE.
  • the UE of the RRC idle state cannot be recognized by the E-UTRAN and is managed by the CN (core network) in units of a tracking area, which is a larger area unit than a cell. That is, the UE in the RRC idle state is identified only in a large area unit, and must move to the RRC connected state in order to receive a normal mobile communication service such as voice or data.
  • the terminal When the user first powers on the terminal, the terminal first searches for an appropriate cell and then stays in an RRC idle state in the cell.
  • the UE in the RRC idle state needs to establish an RRC connection, it establishes an RRC connection with the E-UTRAN through an RRC connection procedure and transitions to the RRC connected state.
  • RRC connection procedure There are several cases in which the UE in RRC idle state needs to establish an RRC connection. For example, an uplink data transmission is necessary due to a user's call attempt, or a paging message is sent from E-UTRAN. If received, a response message may be sent.
  • the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • 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.
  • ECM EPS Connection Management
  • ECM-CONNECTED ECM-CONNECTED
  • 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 context information of the terminal. Accordingly, 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.
  • 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 informs the network of the corresponding position of the terminal through a tracking area update procedure.
  • the system information includes essential information that the terminal needs to know in order to access the base station. Therefore, the terminal must receive all system information before accessing the base station, and must always have the latest system information. In addition, since the system information is information that all terminals in a cell should know, the base station periodically transmits the system information.
  • the system information includes a master information block (MIB) and a scheduling block (SB). It is divided into SIB (System Information Block).
  • MIB master information block
  • SB scheduling block
  • the MIB enables the UE to know the physical configuration of the cell, for example, bandwidth.
  • SB informs transmission information of SIBs, for example, a transmission period.
  • SIB is a collection of related system information. For example, some SIBs contain only information of neighboring cells, and some SIBs contain only information of an uplink radio channel used by the terminal.
  • the terminal sends an RRC connection request message to the network in order to enter the RRC connection state from the RRC idle state (S810).
  • the network sends an RRC connection setup message in response to the RRC connection request (S820). After receiving the RRC connection configuration message, the terminal enters the RRC connection mode.
  • the UE sends an RRC Connection Setup Complete message used to confirm successful completion of RRC connection establishment to the network (S830).
  • an RRC connection reject message is transmitted to the terminal in response to the RRC connection request.
  • NAS Non Access Stratum
  • a NAS message may include an initial UE message, a downlink NAS transport message, or an IE of an uplink NAS transport message. Element) and may be transmitted to the MME (S910).
  • the NAS Transport is for signaling transmission between the UE and the MME through the S1 interface.
  • the NAS transport may first perform a procedure for configuring the S1 interface.
  • the UE may transmit a tracking area update (TAU) or service request (Service Request) to the MME through the eNB through an initial UE message, which is a NAS message.
  • TAU tracking area update
  • Service Request Service Request
  • FIG. 10 is a flowchart illustrating an initial context setup method to which the present invention can be applied.
  • the initial context setup procedure is for setting up all necessary UE context information.
  • the UE context information includes an E-RAB context, a security key, a handover restriction list, and a UE radio caper.
  • the UE radio capability information may be transmitted when the MME has such information, it may not be transmitted when the MME does not know the UE.
  • the MME may transmit an initial context setup request message to the eNB (S1010).
  • the eNB Upon receiving the initial context setup request message, the eNB transmits an initial context setup response message (Initial Context Setup Response) to the MME (S1020) to perform an initial context setup procedure.
  • an initial context setup response message (Initial Context Setup Response) to the MME (S1020) to perform an initial context setup procedure.
  • FIG. 11 is a flowchart illustrating a method of initial security activation to which the present invention can be applied.
  • the E-UTRAN initiates a security activation process by transmitting a Security Mode Command message to a UE that is in an RRC connected state (S1110). This process is the case before the establishment of SRB2 and DRB only if SRB1 is established.
  • the UE upon receiving the security mode command message, generates a K eNB key. It also generates a K RRCint key associated with the integrity check algorithm indicated by the secure mode command message.
  • the lower layer instructs the integrity check of the security mode command message using the integrity check algorithm and the K RRCint key. If the integrity check of the security mode command message is successful, a K RRCenc key and a K UPenc key associated with the encryption algorithm indicated by the security mode command message are generated.
  • the lower layer is instructed to perform integrity check using the integrity check algorithm and the K RRCint key on subsequent RRC messages including the security mode completion message, and simultaneously use the encryption algorithm, the K RRCenc key, and the K UPenc key. Set the encryption process to apply.
  • the AS layer security is considered activated, and a security mode complete message is transmitted to the UE to terminate the security activation process (S1120).
  • the security mode failure message is sent to the terminal to terminate the security activation process.
  • FIG. 12 is a flowchart illustrating a RRC connection resetting process to which the present invention can be applied.
  • RRC Connection reconfiguration is used to modify an RRC connection. It is used to establish / modify / release RBs, perform handovers, and set up / modify / release measurements.
  • the network sends an RRC connection reconfiguration message for modifying the RRC connection to the terminal (S1210).
  • the UE sends an RRC connection reconfiguration complete message used to confirm successful completion of the RRC connection reconfiguration to the network (S1220).
  • FIG. 13 is a diagram illustrating an example of an RRC connection reestablishment procedure to which the present invention can be applied.
  • the terminal stops using all radio bearers that are set except for a signaling radio bearer (SRB 0) and initializes various sub-layers of an access stratum (AS). (S1310).
  • SRB 0 signaling radio bearer
  • AS access stratum
  • each sublayer and physical layer are set to a default configuration.
  • the UE maintains an RRC connection state.
  • the UE performs a cell selection procedure for performing an RRC connection reestablishment procedure (S1320).
  • the cell selection procedure of the RRC connection reestablishment procedure may be performed in the same manner as the cell selection procedure performed by the UE in the RRC idle state, although the UE maintains the RRC connection state.
  • the UE After performing the cell selection procedure, the UE checks the system information of the corresponding cell to determine whether the corresponding cell is a suitable cell (S1330). If it is determined that the selected cell is an appropriate E-UTRAN cell, the UE transmits an RRC connection reestablishment request message to the cell (S1340).
  • the RRC connection re-establishment procedure is stopped, the terminal is in the RRC idle state Enter (S1350).
  • the terminal may be implemented to complete the confirmation of the appropriateness of the cell within a limited time through the cell selection procedure and the reception of system information of the selected cell.
  • the terminal may run a timer as the RRC connection reestablishment procedure is initiated.
  • the timer may be stopped when it is determined that the terminal has selected a suitable cell. If the timer expires, the UE may consider that the RRC connection reestablishment procedure has failed and may enter the RRC idle state.
  • This timer is referred to hereinafter as a radio link failure timer.
  • a timer named T311 may be used as a radio link failure timer.
  • the terminal may obtain the setting value of this timer from the system information of the serving cell.
  • the cell When the RRC connection reestablishment request message is received from the terminal and the request is accepted, the cell transmits an RRC connection reestablishment message to the terminal.
  • the UE Upon receiving the RRC connection reestablishment message from the cell, the UE reconfigures the PDCP sublayer and the RLC sublayer for SRB1. In addition, it recalculates various key values related to security setting and reconfigures the PDCP sublayer responsible for security with newly calculated security key values.
  • SRB 1 between the UE and the cell is opened and an RRC control message can be exchanged.
  • the terminal completes the resumption of SRB1 and transmits an RRC connection reestablishment complete message indicating that the RRC connection reestablishment procedure is completed to the cell (S1360).
  • the cell transmits an RRC connection reestablishment reject message to the terminal.
  • the cell and the terminal perform the RRC connection reestablishment procedure.
  • the UE recovers the state before performing the RRC connection reestablishment procedure and guarantees the continuity of the service to the maximum.
  • FIG. 14 is a flowchart illustrating a method of switching from an idle state to a connected state.
  • a UE in an idle state needs to perform an RRC connection procedure, which takes a certain time. do.
  • the UE receives system information (System Information) from the eNB (S1410).
  • System Information System Information
  • the system information may be classified into a material information block (MIB) or a system information block (SIB).
  • MIB material information block
  • SIB system information block
  • the UE transmits a service request (Service Request) from the NAS (in UE) to the RRC (or AS) layer (S1412).
  • Service Request a service request from the NAS (in UE) to the RRC (or AS) layer (S1412).
  • the UE receives and stores information about a random access from the eNB through the system information, and when a random access is required, the UE transmits a random access preamble (also called message 1) to the eNB to the base station. (S1414).
  • a random access preamble also called message 1
  • the base station When the base station receives a random access preamble from the UE, the base station transmits a random access response message (also referred to as message 2) to the UE (S1416).
  • a random access response message (also referred to as message 2)
  • downlink scheduling information on the random access response message may be CRC masked with a random access-radio network temporary identifier (RA-RNTI) and transmitted on an L1 or L2 control channel (PDCCH).
  • RA-RNTI random access-radio network temporary identifier
  • PDCCH L1 or L2 control channel
  • the UE may receive and decode a random access response message from a physical downlink shared channel (PDSCH). Thereafter, the UE checks whether there is random access response information indicated to the random access response message.
  • PDSCH physical downlink shared channel
  • Whether there is random access response information indicated to the self may be determined by whether there is a random access preamble ID (RAID) for the preamble transmitted by the UE.
  • RAID random access preamble ID
  • the random access response information includes a timing alignment (TA) indicating timing offset information for synchronization, radio resource allocation information used for uplink, and a temporary identifier (eg, Temporary C-RNTI) for UE identification.
  • TA timing alignment
  • radio resource allocation information used for uplink
  • a temporary identifier eg, Temporary C-RNTI
  • the UE transmits an RRC connection request message to the eNB to request RRC connection establishment with the eNB (S1418).
  • the RRC Connection Request message may include an S-TMIS, a Cause field, and the like.
  • the Cause field may include information indicating the purpose of transmitting an RRC Connection Request message, and the purpose may indicate an uplink resource allocation request for a low delay service (e.g., mobile originating urgent, mobile terminating urgent) purpose.
  • a low delay service e.g., mobile originating urgent, mobile terminating urgent
  • the UE receives an RRC Connection Setup message corresponding to the response to the RRC Connection Request message from the eNB (S1420).
  • the RRC Connection Setup message may include a UL resource response IE indicating result information or response information on an uplink resource allocation request of the UE.
  • the eNB may perform uplink resource allocation for the UE based on the UL resource request IE received from the UE.
  • the UE transmits an RRC connection setup complete message through an uplink resource allocated from the eNB (S1422).
  • the eNB Upon receiving the RRC connection setup complete message, the eNB notifies the MME of the connection while transmitting a service request message to the MME (S1424).
  • the MME receiving the service request message, through the initial context setup request message, security information of the UE (Security Information), data bearer information used by the UE, the UE in the eNB Information on the serving gateway to which the transmitted data should be transmitted, that is, S1-U UL information of the UE (uplink bearer GPRS Tunneling Protocol (GTP) tunnel ID (TEID) and IP address of the serving gateway);
  • the UE transmits context information of the UE including mobility management information of the UE to the eNB (S1426).
  • the eNB transmits a security mode command and an RRC connection reconfiguration message to the UE for access stratum (AS) security and data bearer setup (S1428).
  • AS access stratum
  • the eNB establishes an access stratum (AS) security and a data bearer between the UE and the eNB based on the context information of the UE received from the MME.
  • AS access stratum
  • the UE transmits a Security Mode Complete and an RRC Connection Reconfiguration Complete message to the eNB (S1430).
  • the eNB notifies the MME that the context and data bearer setup of the UE has been successfully performed through an initial context setup response message (S1432).
  • the transition time to the connection mode according to the RRC connection setting and the data connection setting in the idle state is 35.5 ms for the RRC connection setting and 49.5 ms for the security setting and the data connection setting for the wireless link. Time is consumed (not including backhaul transmission time).
  • the present invention provides a method and apparatus for reducing the data transmission and reception delay to provide the low delay service to solve this problem.
  • 15 is a flowchart illustrating an example of a method of switching from an idle state to a connected state to which the present invention can be applied.
  • an idle UE transmits information indicating an MME that is previously connected or recognizes the UE to an eNB, and the eNB transmits information related to the UE from the MME based on the information indicating the MME.
  • the RRC connection procedure may be performed by acquiring.
  • the transition to the connected state means that not only the logical connection setup with the base station but also the logical connection (S1 connection / interface, ECM connection) setup with the MME is completed.
  • steps S1510 and S1512 are the same as the steps S1410 and S1412 of FIG. 14, description thereof will be omitted.
  • the UE transmits an RRC Connection Request message to the eNB to request RRC connection establishment with the eNB (S1514).
  • the RRC Connection Request message may include an S-TMIS, a Cause field, an MME ID IE field, and the like.
  • the Cause field may include information indicating a purpose of transmitting an RRC Connection Request message, and the purpose may indicate a connection state switching request for a low delay service (e.g., mobile originating urgent, mobile terminating urgent) purpose.
  • a low delay service e.g., mobile originating urgent, mobile terminating urgent
  • the MME ID IE field is information indicating an MME to which the UE has previously connected and / or an MME holding Context information of the UE described with reference to FIG. 14 and includes information related thereto.
  • the MME ID IE field may include a PLMN ID (Public Land Mobile Network Identifier) indicating a user network identification number, an MME Group Identifier (MMEGI) indicating an MME group identifier, and an MMEC (MME Code) indicating an MME code identifier. It may include at least one or more.
  • PLMN ID Public Land Mobile Network Identifier
  • MMEGI MME Group Identifier
  • MME Code MME Code
  • the MME ID IE field may not include the MMEC.
  • the S-TMIS, the Cause field, and the MME ID IE field may be included in another message as well as the RRC connection request message.
  • the UE may request the eNB to secure in advance context information of the UE from an MME corresponding to an identifier and / or a code included in the MME ID IE field through the RRC request message. .
  • the base station transmits to the other MME the UE. Authentication and context information processing may be requested. Also, context information about the UE may be exchanged between MMEs.
  • the eNB may determine whether the UE is to be provided with a general service or a low delay service through a Cause field of the RRC connection request.
  • the eNB informs the MME based on an identifier and / or code included in the MME ID IE field through an initial UE transfer message. Informs that the UE is connected to the eNB, and requests context information of the UE (S1516).
  • the initial UE transmission message may further include fields shown in Table 1 below in addition to the MME ID IE field.
  • the initial UE transmission message may serve to inform the MME of information of the eNB to which the UE is connected and to request context information of the UE.
  • the UE receives an RRC connection setup message from the eNB in response to the RRC connection request message (S1518).
  • the MME acquires the context information of the UE through a Home Subscriber Server (HSS) in response to the request of the context information of the eNB, and transmits the context information of the UE to the eNB through an initial context pre setup request message. (S1520).
  • HSS Home Subscriber Server
  • the context information may be transmitted to the eNB through the initial context pre setup request message as well as other messages.
  • the initial context free setup request message includes information related to data connection (UE Aggregate Maximum Bit Rate, E-RAB) and security related information (UE Security Capabilities, Security Key) of the UE requested by the eNB as shown in Table 2 below. It may include.
  • Level QoS Parameters Define the QoS (e.g., QoS Class identifier, Allocation and Retention Priority) to be applied to an E-RAB Transport Layer Address IP address of the serving gateway GTP-TEID GTP Tunnel Endpoint Identifier to be used the user plane transport between eNB and the Serving gateway UE Security Capabilities Define the supported algorithms for encryption and integrity protection in the UE Security Key Used to apply security in the eNB
  • the eNB transmits a security mode command message to the UE in order to set security for the radio link using the context information of the UE received from the MME (S1522), and the RRC from the UE. Receive a RRC Connection Setup Complete message (S1524).
  • UE Aggregate Maximum Bit Rate, E-RAB E-RAB
  • security related information UE Security Capabilities, Security Key
  • the eNB Upon receiving the RRC connection setup complete message, the eNB notifies the MME of the UE while transmitting a service request message (S1526), and completes a security mode in response to the security mode command message from the UE (Security Mode). Complete) can be set to secure the untrusted link (S1528).
  • the service request message is an example of a NAS message transmitted by the base station to the MME for control and data connection of the UE.
  • the MME determines whether the UE is suitable through authentication information (eg, KSI, sequence number, Message authentication code) of the UE included in the service request message which is a NAS message.
  • authentication information eg, KSI, sequence number, Message authentication code
  • the MME may transmit a UE Authentication Result Transfer message including information related to the authentication (integrity, validity) result of the UE to the eNB (S1530).
  • the UE authentication result transmission message may include information as shown in Table 3 below.
  • the eNB may perform the following operation according to the UE Authentication Result indicating the authentication result of the UE of Table 3.
  • the eNB sends an RRC Connection Reconfiguration message to the UE (S1532), and the UE sends an RRC to the eNB in response.
  • a RRC Connection Reconfiguration complete message may be transmitted (S1534).
  • the eNB may establish a data connection on the radio link using the context information of the UE received through the MME.
  • the eNB receives the context information of the UE from the MME in step S1520 and before the UE transmits the security mode command message to the UE or when the UE sends a control and data connection request message to the base station (e.g., the RRC connection reconfiguration message for data connection establishment may be configured before transmitting the service request message.
  • the eNB may receive the context information from the MME and immediately generate the RRC connection reconfiguration message.
  • step S1532 the eNB may only transmit the already generated RRC connection reconfiguration message.
  • the eNB may inform the MME of a result of data connection establishment in a wireless link through an initial context pre-setup response message (S1536).
  • the initial context free setup response message may include information as shown in Table 4 below.
  • the eNB may release the RRC connection by sending an RRC Connection Release message to the UE.
  • the security setting between the UE and the eNB when the security setting between the UE and the eNB is normally performed through the step S1522 and the step S1528, it may be instructed to retransmit the corresponding NAS message before transmitting the RRC Connection Release message.
  • the time required for switching from the idle state to the connected state takes 66 ms as shown in FIG. 15. This is because the eNB acquires the context information of the UE in advance while making a service request to the MME through the ID of the MME to which the UE is previously connected, thereby switching from an idle state to a connected state. There is an effect that can reduce the time required.
  • 16 is a diagram illustrating an example of a method for generating a security key when switching to a connected state to which the present invention can be applied.
  • the MME initiates an AKA (Authentication and Key Agreement) process by requesting an authentication vector (HE) from a home environment (HE).
  • AKA Authentication and Key Agreement
  • the HE responds to the MME with an authentication vector that includes a K ASME that is a base-key. Therefore, as a result of the AKA process, the EPC and the UE, that is, the UE, may share the K ASME .
  • NAS keys and parameters such as K eNB and NH (Next Hop) are generated from the K ASME .
  • the K ASME is not delivered to an entity outside the EPC, but when the UE transitions to the ECM-CONNECTED state, the K eNB and the NH may be delivered from the EPC to the eNB.
  • the eNB and the UE may generate UP (User Plain) keys and RRC keys from K eNB .
  • UP User Plane
  • RRC keys may be updated upon handover.
  • K eNB * may be generated by the UE and the source eNB from the target physical cell ID (PCI), the target frequency and K eNB , or a combination of the target PCI, target frequency and NH.
  • PCI target physical cell ID
  • K eNB * may be generated by the UE and the source eNB from the target physical cell ID (PCI), the target frequency and K eNB , or a combination of the target PCI, target frequency and NH.
  • K eNB * hereafter refers to a new K eNB used for RRC and UP traffic in the target cell. If the UE transitions to ECM-IDLE state, all keys are deleted from the eNB.
  • the security of the AS layer includes encryption of the user data in the DRB and the RRC signaling in the SRB along with the integrity check for the RRC signaling in the SRB.
  • the RRC layer controls security settings that are part of the AS configuration.
  • the security setting includes two parameters such as 'keyChangeIndicator' and 'nextHopChainingCount', together with an integrity check algorithm and an encryption algorithm.
  • the security setting is used when the UE determines an AS layer security key during handover and / or RRC connection reestablishment.
  • Integrity checking algorithms are common to SRB1 and SRB2, and encryption algorithms are common to all RBs, namely SRB1, SRB2 and DRB.
  • AS layer is applied to three different secret key, that is a key for an integrity check of the RRC signaling RRCint K, the key K and the key K RRCen UPenc for encryption of the user data for encryption of RRC signaling. All three security keys are generated from the K eNB .
  • Integrity checking and encryption of the RRC message for performing the handover is performed by the source eNB based on the security settings in use prior to performing the handover.
  • the integrity check algorithm and the encryption algorithm can be changed only after performing the handover, and the four AS layer security keys, that is, K eNB , K RRCint , K RRCenc and K UPenc , are changed at each handover and RRC connection reestablishment.
  • the 'keyChangeIndicator' is used during handover and indicates whether the UE uses security keys associated with the latest available KASME key.
  • 'nextHopChaingCount' is used when a new KeNB is generated by the UE in handover and RRC connection reestablishment.
  • An intra cell handover procedure may be used to change the security keys in an RRC connected state.
  • the eNB deletes the security keys of the UE that is in the RRC idle state, and stores only in the MME. That is, eNB and UE deletes NH, K eNB , K RRCint , K RRCenc , and K UPenc , but MME and UE store K ASME , K NASint and K NASenc .
  • 17 is a flowchart illustrating still another example of a method of switching from an idle state to a connected state to which the present invention can be applied.
  • the eNB may determine whether the UE is a suitable UE through a message transmitted from the UE, not a message transmitted from the MME.
  • step S1710 to step S1728 are the same as step S1510 to step S1528 of FIG. 15, description thereof will be omitted.
  • the MME may operate similarly to step S1530 of FIG. 15. That is, the MME may determine whether the UE is suitable through authentication information (eg, KSI, sequence number, Message authentication code) of the UE included in the mall service request message which is a NAS message.
  • authentication information eg, KSI, sequence number, Message authentication code
  • the MME may transmit a UE Authentication Result Transfer message including information related to the authentication (integrity, validity) result of the UE to the eNB (S1730). .
  • steps S1732 to S1736 are the same as steps S1532 to S1536 of FIG. 15, and thus description thereof is omitted.
  • the eNB may release the RRC connection by sending an RRC Connection Release message to the UE.
  • the security setting between the UE and the eNB when the security setting between the UE and the eNB is normally performed through steps S1722 and S1728, it may be instructed to retransmit the corresponding NAS message before transmitting the RRC Connection Release message.
  • the eNB is in a message transmitted from the UE (eg, a secure mode completion message).
  • Checking a message authentication code eg, MAC-I: Message Authentication Code for Integrity
  • the eNB determines whether the UE is a suitable UE. For example, the eNB determines that the UE is a suitable UE if the message authentication code received from the UE matches the message authentication code generated by the integrity algorithm using the message sent by the eNB with the message authentication code. If it does not match, the UE may determine that the UE is not suitable.
  • the eNB When the eNB determines that the UE is a suitable UE as a result of the determination, the eNB transmits an RRC Connection Reconfiguration message to the UE (S1732), and the UE reconfigures the RRC connection to the eNB in response thereto.
  • a RRC Connection Reconfiguration complete message may be transmitted (S1734).
  • the eNB may establish a data connection on the radio link using the context information of the UE received through the MME.
  • the eNB configures an RRC connection reconfiguration message for data connection establishment as soon as the context information of the UE is received from the MME in step S1720, and in step S1732, only the transmission of the configured RRC connection reconfiguration message may be performed. have.
  • the eNB may inform the MME of a result of data connection establishment in a wireless link through an initial context pre-setup response message (S1736).
  • the initial context free setup response message may include information as shown in Table 4 above.
  • the eNB may release the RRC connection by sending an RRC Connection Release message to the UE.
  • the security setting between the UE and the eNB when the security setting between the UE and the eNB is normally performed through steps S1722 and S1728, it may be instructed to retransmit the corresponding NAS message before transmitting the RRC Connection Release message.
  • the time required for switching from the idle state to the connected state takes 66 ms as shown in FIG. 17. This is because the eNB acquires the context information of the UE in advance while making a service request to the MME through the ID of the MME to which the UE is previously connected, thereby switching from an idle state to a connected state. There is an effect that can reduce the time required.
  • FIG. 18 is a flowchart illustrating still another example of a method of switching from an idle state to a connected state to which the present invention can be applied.
  • step S1810 to step S1820 is the same as step S1510 to step S1520 of FIG. 15, description thereof will be omitted.
  • the eNB Upon receiving the initial context free setup request message from the MME, the eNB receives an RRC connection setup complete message including a NAS message (eg, a service request) from the UE (S1822).
  • a NAS message eg, a service request
  • the eNB After receiving the RRC connection setup complete message, the eNB notifies the UE of the connection while transmitting a service request message to the MME (S1824), and the MME is a NAS message of the UE included in the service request message.
  • Authentication information eg, KSI, sequence number, Message authentication code determines whether the UE is suitable.
  • the MME may transmit a UE Authentication Result Transfer message including information indicating that the UE is authenticated to the eNB (S1826).
  • the UE authentication result transmission message may include information as shown in Table 3 above.
  • the eNB may perform the following operation.
  • the eNB may configure a security mode command and an RRC connection reconfiguration message, or a security mode command information and / or RRC connection reconfiguration for the security configuration and data connection establishment to the UE.
  • the control message including the information is transmitted (S1828), and the UE may transmit a security mode completion and RRC connection reconfiguration complete message or response message to the eNB in response (S1830).
  • the eNB may configure security settings and data connection on the radio link using the context information of the UE received through the MME.
  • the eNB may inform the MME of a result of data connection establishment in a wireless link through an initial context pre-setup response message (S1832).
  • the initial context free setup response message may include information as shown in Table 4 above.
  • the eNB may release the RRC connection by sending an RRC Connection Release message to the UE.
  • the time required for switching from the idle state to the connected state takes 71 ms as shown in FIG. 18. This is because the eNB acquires the context information of the UE in advance while making a service request to the MME through the ID of the MME to which the UE is previously connected, thereby switching from an idle state to a connected state. There is an effect that can reduce the time required.
  • Table 5 below is a table comparing an example of the time required for switching from the idle state to the connected state according to the present invention.
  • a service can be provided to a user by switching from an idle state to a connected state faster than a conventional place where a low delay service is needed.
  • FIG. 19 is a diagram illustrating an example of an internal block diagram of a wireless device to which the present invention can be applied.
  • the wireless device may be an eNB and a UE, and the eNB includes both a macro base station and a small base station.
  • the eNB 1910 and the UE 1920 include a communication unit (transmitter / receiver unit, RF unit, 1913, 1923), a processor 1911, 1921, and a memory 1912, 1922.
  • the eNB and the UE may further include an input unit and an output unit.
  • the communication units 1913 and 1923, the processors 1911 and 1921, the input unit, the output unit, and the memory 1912 and 1922 are functionally connected to perform the method proposed in the present specification.
  • the communication unit transmitter / receiver unit or RF unit, 1913, 1923
  • the communication unit receives information generated from the PHY protocol (Physical Layer Protocol)
  • the received information is transferred to the RF-Radio-Frequency Spectrum, filtered, and amplified.
  • the communication unit functions to move an RF signal (Radio Frequency Signal) received from the antenna to a band that can be processed by the PHY protocol and perform filtering.
  • the communication unit may also include a switch function for switching the transmission and reception functions.
  • Processors 1911 and 1921 implement the functions, processes, and / or methods proposed herein. Layers of the air interface protocol may be implemented by a processor.
  • the processor may be represented by a controller, a controller, a control unit, a computer, or the like.
  • the memories 1912 and 1922 are connected to a processor and store protocols or parameters for performing an uplink resource allocation method.
  • Processors 1911 and 1921 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 communication unit may include a baseband circuit for processing a wireless signal.
  • 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.
  • the output unit (display unit or display unit) is controlled by a processor and outputs information output from the processor together with a key input signal generated at the key input unit and various information signals from the processor.
  • the RRC connection method in the wireless communication system of the present invention has been described with reference to an example applied to the 3GPP LTE / LTE-A system, but it is possible to apply to various wireless communication systems in addition to the 3GPP LTE / LTE-A system.

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

Abstract

La présente invention concerne un procédé et un dispositif pour une connexion RRC dans un système de communication sans fil prenant en charge un service à faible latence. La présente invention concernent un procédé et un dispositif, le procédé comprenant les étapes suivantes : recevoir des informations de système provenant d'une station de base ; transmettre un message de requête de connexion RRC, qui comprend un champ d'identifiant (ID) d'entité de gestion de mobilité (MME) indiquant une MME ayant été connectée à un terminal dans le passé, à la station de base compte tenu des informations de système ; recevoir un message de configuration de connexion RRC en réponse au message de requête de connexion RRC ; et réaliser une configuration de sécurité et une configuration de connexion de données avec la station de base, la MME étant une MME correspondant à un ID ou un code compris dans le champ d'ID de MME.
PCT/KR2015/006092 2015-03-05 2015-06-16 Procédé et dispositif pour une connexion rrc d'un terminal dans un système de communication sans fil WO2016140403A1 (fr)

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CN110830997A (zh) * 2018-08-10 2020-02-21 中兴通讯股份有限公司 密钥的确定方法及装置、存储介质、电子装置
WO2021194166A1 (fr) * 2020-03-24 2021-09-30 삼성전자 주식회사 Procédé et dispositif de réduction de consommation de puissance de terminal fixe dans un système de communication sans fil
CN113490284A (zh) * 2021-07-15 2021-10-08 北京小米移动软件有限公司 调度请求方法及装置、电子设备、存储介质
CN113940105A (zh) * 2019-06-13 2022-01-14 苹果公司 用于在未激活安全时重新建立5g-nr rrc连接的方法
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CN110731091B (zh) * 2017-04-21 2023-09-15 诺基亚技术有限公司 用于促进用户设备的无线电链路恢复的方法、元件、介质及用户设备
US10694574B2 (en) 2017-07-27 2020-06-23 Lg Electronics Inc. Method and apparatus for performing EDT
US11026286B2 (en) 2017-07-27 2021-06-01 Lg Electronics Inc. Method and apparatus for performing EDT
WO2019022534A1 (fr) * 2017-07-27 2019-01-31 Lg Electronics Inc. Procédé et appareil pour effectuer une edt
US11589413B2 (en) 2017-07-27 2023-02-21 Lg Electronics Inc. Method and apparatus for performing EDT
CN110312296B (zh) * 2018-03-27 2023-09-08 夏普株式会社 用户设备执行的方法、基站执行的方法、用户设备和基站
CN110312296A (zh) * 2018-03-27 2019-10-08 夏普株式会社 用户设备执行的方法、基站执行的方法、用户设备和基站
US11240665B2 (en) 2018-04-04 2022-02-01 Samsung Electronics Co., Ltd. Method and device for authenticating UE
US11696132B2 (en) 2018-04-04 2023-07-04 Samsung Electronics Co., Ltd. Method and device for authenticating UE
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WO2019194578A1 (fr) * 2018-04-04 2019-10-10 Samsung Electronics Co., Ltd. Procédé et dispositif d'authentification d'ue
CN110830997B (zh) * 2018-08-10 2022-08-19 中兴通讯股份有限公司 密钥的确定方法及装置、存储介质、电子装置
CN110830997A (zh) * 2018-08-10 2020-02-21 中兴通讯股份有限公司 密钥的确定方法及装置、存储介质、电子装置
CN113940105A (zh) * 2019-06-13 2022-01-14 苹果公司 用于在未激活安全时重新建立5g-nr rrc连接的方法
CN114375587A (zh) * 2019-09-20 2022-04-19 株式会社Ntt都科摩 终端
CN114375587B (zh) * 2019-09-20 2024-04-12 株式会社Ntt都科摩 终端
WO2021194166A1 (fr) * 2020-03-24 2021-09-30 삼성전자 주식회사 Procédé et dispositif de réduction de consommation de puissance de terminal fixe dans un système de communication sans fil
CN113490284A (zh) * 2021-07-15 2021-10-08 北京小米移动软件有限公司 调度请求方法及装置、电子设备、存储介质

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