WO2017191926A1 - Procédé et appareil de changement d'état de connexion de terminal - Google Patents

Procédé et appareil de changement d'état de connexion de terminal Download PDF

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Publication number
WO2017191926A1
WO2017191926A1 PCT/KR2017/004432 KR2017004432W WO2017191926A1 WO 2017191926 A1 WO2017191926 A1 WO 2017191926A1 KR 2017004432 W KR2017004432 W KR 2017004432W WO 2017191926 A1 WO2017191926 A1 WO 2017191926A1
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WO
WIPO (PCT)
Prior art keywords
terminal
connection state
base station
paging
rrc
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Application number
PCT/KR2017/004432
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English (en)
Korean (ko)
Inventor
홍성표
최우진
Original Assignee
주식회사 케이티
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to US16/098,841 priority Critical patent/US10667322B2/en
Priority to CN201780027502.5A priority patent/CN109076496B/zh
Priority claimed from KR1020170053295A external-priority patent/KR102057212B1/ko
Publication of WO2017191926A1 publication Critical patent/WO2017191926A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel

Definitions

  • the present embodiment relates to a control plane signaling method and apparatus for reducing signaling according to a connection state change of a terminal. More specifically, the present invention relates to a method and apparatus for changing a connection state by a terminal in a light connection state using a paging message.
  • LTE Long Term Evolution
  • LTE-Advanced of the current 3GPP series are high-speed, high-capacity communication systems that can transmit and receive various data such as video and wireless data, beyond voice-oriented services.
  • the development of technology capable of transferring large amounts of data is required.
  • MTC machine type communication
  • This transmission and reception procedure causes a relatively very high data load compared to a small amount of data to be transmitted by the terminal. That is, there is a problem that unnecessary data overload occurs in the RRC connection state change procedure for transmitting a small amount of data.
  • This problem will result in increasing the data load on the entire communication system as more terminals for periodically transmitting a small amount of data.
  • an embodiment of the present invention adds a light connection state to an RRC connection and an RRC idle in addition to the RRC connection and RRC idle, thereby reducing the load of the entire communication system and speeding data transmission and reception. It is intended to propose a method and an apparatus for configuring to be made.
  • an embodiment is to propose a specific terminal operation when receiving a paging message from the base station when the terminal is in the light connection state.
  • a method of changing a connection state of a terminal wherein the RRC (Radio Resource Control) includes instruction information indicating a state change from a base station to a light connection state. ) Configuring the connection state of the terminal to the light connection state based on the step of receiving the message and the indication information, receiving the paging message for the terminal, and changing the connection state of the terminal based on the terminal identifier included in the paging message. It provides a method comprising the step of determining.
  • the RRC Radio Resource Control
  • a base station transmits a radio resource control (RRC) message including indication information indicating a state change to a light connection state to a terminal. And changing the connection state of the terminal to the light connection state and transmitting a paging message including the terminal identifier to the terminal to trigger a change in the connection state of the terminal. All signaling radio bearers (SRBs) and data radio bearers (DRBs) are suspended, but the terminal context is provided.
  • RRC radio resource control
  • a terminal for changing a connection state includes: a receiving unit and indication information for receiving a radio resource control (RRC) message including indication information indicating a state change from a base station to a light connection state; And a control unit configured to configure the connection state of the terminal into a light connection state based on the receiving unit, wherein the receiving unit further receives a paging message for the terminal, and the control unit determines the connection state change of the terminal based on the terminal identifier included in the paging message. It provides a terminal device.
  • RRC radio resource control
  • an embodiment of the present invention provides a base station for controlling a connection state of a terminal, including: a transmitter for transmitting a radio resource control (RRC) message including instruction information indicating a state change to a light connection state to a terminal;
  • the control unit includes a control unit for changing the connection state of the terminal to the light connection state, wherein the control unit transmits a paging message including the terminal identifier to the terminal to trigger a connection state change of the terminal, the control unit is all signaling radio of the terminal.
  • the BS and the DRB Data Radio Bearer
  • the embodiments described above provide an effect of reducing the data load of the entire communication system by providing a reduced signaling procedure for a terminal that performs frequent connection state changes.
  • the present embodiments have the effect of eliminating the ambiguity of the paging message processing operation of the terminal by providing a specific method for processing the paging message when the terminal is in the light connection state.
  • FIG. 1 is a diagram illustrating a specific procedure for changing the connection state of a conventional terminal by way of example.
  • FIG. 2 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment.
  • FIG. 3 is a flowchart illustrating an operation of a base station according to an embodiment.
  • FIG. 4 is a diagram illustrating a paging message processing procedure in a mobile situation of the terminal according to an embodiment.
  • FIG. 5 is a diagram illustrating an example of a terminal configuration.
  • FIG. 6 is a diagram illustrating a configuration of a base station according to an embodiment.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement.
  • the MTC terminal may mean a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
  • the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations.
  • the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or supports UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or lower power consumption).
  • low complexity can mean UE category / type.
  • the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
  • the wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB).
  • a user terminal is a generic concept meaning a terminal in wireless communication.
  • user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
  • a base station or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, a Site, and a BTS.
  • Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.
  • RRH remote radio head
  • RU radio unit
  • a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.
  • BSC base station controller
  • the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station.
  • the base station may indicate the radio area itself to receive or transmit a signal from the viewpoint of the user terminal or the position of a neighboring base station.
  • megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmission / reception points, transmission points, and reception points are collectively referred to as base stations. do.
  • LPNs low power nodes
  • the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
  • the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
  • the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
  • the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-TDMA
  • UMB Universal Mobile Broadband
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.
  • the uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like.
  • Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
  • EPDCCH enhanced PDCCH
  • extended PDCCH extended PDCCH
  • a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
  • antenna transmission system a cooperative multi-cell communication system.
  • the CoMP system may include at least two multiple transmission / reception points and terminals.
  • the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • an eNB a base station or a macro cell
  • a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
  • uplink refers to a communication or communication path from a terminal to multiple transmission / reception points.
  • a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.
  • a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the EPDCCH.
  • the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
  • the EPDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the EPDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.
  • high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.
  • the eNB performs downlink transmission to the terminals.
  • the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
  • PUSCH physical uplink shared channel
  • the terminal and the network state are divided into a terminal idle state and a connected state.
  • the terminal and the network state are consistent.
  • states in the wireless network (E-UTRAN) and the core network for example, the RRC state and the ECM state
  • the UE enters the ECM-IDLE state.
  • the UE transitions to the RRC-CONNECTED state
  • the UE enters the ECM-CONNECTED state.
  • the terminal state in order to transmit data, the terminal in the idle state has to perform a complicated signaling process as shown in FIG. 1. In particular, when a terminal transmits a small amount of data, it becomes a large overhead.
  • FIG. 1 is a diagram illustrating a specific procedure for changing the connection state of a conventional terminal by way of example.
  • the terminal 100 transmits a random access preamble to the base station 110 in order to transmit data by transitioning from the RRC idle state to the RRC connected state (S100). Thereafter, the terminal 100 receives a random access response from the base station 110 (S101), and requests the base station 110 to reset the RRC connection (S102).
  • the base station 110 sets up the RRC connection setup to the terminal 100 (S103), and the terminal 100 reports completion (S104).
  • the base station 110 transmits an initial terminal message to the MME 120 to request a service (S105).
  • the MME 120 requests the base station 110 for initial context setup (S107).
  • the base station 110 may set a measurement configuration by transmitting an RRC connection reconfiguration message to the terminal 100 (S106).
  • the terminal 100 transmits an RRC connection reconfiguration message to the base station 110 (S108).
  • the base station 110 transmits a secure mode command to the terminal 100 (S109), and receives a response thereto (S110).
  • the base station 110 transmits an RRC connection reconfiguration message for radio bearer setup to the terminal 100 (S111), and receives a response thereto (S112).
  • the base station 110 transmits a response to the initial context setup to the MME 120 (S113), and the MME 120 transmits a bearer modification request to the gateway 130 (S114).
  • the terminal 100 transmits a UDP / IP packet to the base station 110 (S115), and the base station 110 transmits the packet to the gateway 130 (S116).
  • the gateway 130 transmits a response to the bearer modification to the MME 120 (S117), and transmits a UDP / IP packet response to the base station 110 (S118).
  • the base station 110 transmits the packet to the terminal 100 (S119).
  • the terminal 100 delivers the packet to the core network.
  • the terminal 100 transmits a measurement report to the base station 120 at the periodic or event occurrence according to the measurement configuration (S120).
  • the base station 120 determines whether to release the terminal 100 based on the measurement report or the deactivation timer (S121). If the RRC connection release of the terminal 100 is determined, the base station 110 requests the terminal context release to the MME 120 (S122).
  • the MME 120 commands the terminal context release to the base station 110 (S123), and the base station 110 instructs the terminal 100 to release the RRC connection accordingly (S124).
  • the base station 110 After the base station 110 releases the RRC connection of the terminal 100, the base station 110 transmits a response to the MME 120 (S125).
  • the RRC connection terminal may transition to the RRC idle state.
  • a plurality of signaling procedures are required between the terminal and the base station, the base station, and the core network in order for the terminal to transition from the RRC idle state to the RRC connected state or from the RRC connected state to the RRC idle state.
  • this procedure when the UE periodically transmits a small amount of data, overhead occurs continuously.
  • the terminal in order to reduce the overhead due to the state transition, the terminal can be kept connected, but in this case, even when there is no data transmission, the network state must be periodically measured according to the measurement configuration, and the unnecessary power such as reporting the measurement result. Consumption may be caused.
  • the handover signaling overhead increases according to the movement of the terminal.
  • the narrow band IoT terminal is operated in a fixed state and may be installed at a specific location or located within a specific range. Due to this characteristic, the NB-IoT terminal and the base station support the Suspend / Resume procedure.
  • the base station may request that the terminal maintains an AS context in the RRC_IDLE state.
  • the terminal receives the RRC connection release message including the RRC suspend information and transitions to the RRC IDLE state (or before the base station sends the message to the terminal), the base station sends an S1 message requesting the state transition of the terminal to the core network. Send ECM IDLE state.
  • the RRC connection resume procedure is used for an RRC Connected transition in RRC IDLE where information previously stored in the terminal and the base station is used to resume the RRC connection.
  • the base station sends an S1 message to the core network requesting the state transition of the UE to the ECM CONNECTED state.
  • the RRC connection state and the ECM connection state are made the same, and thus there is a problem in that unnecessary overhead is generated between the base station and the core network. That is, as described above, in the conventional mobile communication technology, there is a signaling overhead problem due to a state transition, and the suspend / resume procedure for the fixed location terminal that can reduce the problem can be applied only to the NB-IoT terminal. . Accordingly, when the terminal leaves the cell (or base station) provided with the previously stored AS context, the terminal had to perform a service request procedure as shown in FIG. 1 to transmit the uplink data. In addition, since the UE transitions from the Suspend state to the Resume state is the same as the transition between the IDLE state and the CONNECTED state, there is a problem of continuously inducing core network signaling (S1 signaling).
  • S1 signaling core network signaling
  • the terminal and the base station have a core network because a state of a wireless network connection has occurred based on signaling and user data generated at an upper layer (eg, Non Access Stratum, IP, GTP, etc.) of an AS (Access Stratum).
  • an upper layer eg, Non Access Stratum, IP, GTP, etc.
  • AS Access Stratum
  • a method of triggering paging itself in a wireless network can be considered, but this method has not been suggested.
  • paging according to the prior art is triggered through the core network. Therefore, a method of triggering paging in a wireless network may have a problem in that it cannot sufficiently provide a paging function triggered through the core network.
  • Embodiments described below may be applied to a terminal using any mobile communication technology.
  • the present embodiments may be applied to next generation mobile communication (eg, 5G mobile communication) terminals as well as mobile communication terminals to which LTE technology is applied.
  • the base station may refer to an eNode-B of LTE / E-UTRAN, and the base station (CU, DU, or CU) in a 5G wireless network in which a central unit (CU) and a distribution unit (DU) are separated from each other.
  • DU may represent an entity implemented as one logical entity).
  • the base station In order to reduce signaling due to a state transition of the terminal, the base station maintains a connection between the base station and the core network (for example, an S1 connection in LTE or an interface connection between the base station and the core network entity in 5G) to the terminal.
  • a connection between the base station and the core network for example, an S1 connection in LTE or an interface connection between the base station and the core network entity in 5G
  • Some or all of the UE's operation in the RRC idle state eg, cell reselection, paging, radio resource release / suspend / suspend, some radio resource maintenance / standby
  • the base station can be instructed to perform
  • a state in which a part or all operations of an RRC idle state is performed in a state in which a control plane or a user plane connection is maintained on a base station and a core network interface with respect to a terminal is represented as a light connection state.
  • the light connection state includes a new RRC state, a substate of an RRC connection, a terminal mobility providing connection state, a wireless network paging state, a connection waiting state, an RRC idle state maintaining an S1 connection, an RRC idle state maintaining a core network connection, and an S1 connection. It may be referred to in various terms such as a standby state, a light connection state, and there is no limitation on the name.
  • the base station when the base station instructs to switch the RRC connected terminal to the light connection state, it is possible not to send a terminal context release request message to the core network. That is, signaling for releasing the connection on the interface between the core network and the base station is not performed. Or (S1) connection on the interface between the core network and the base station is maintained.
  • the base station when the base station releases the RRC connection state to the terminal, the base station sends a terminal context release request message to request the MME to release the logical S1 connection associated with the terminal.
  • connection state of the newly defined terminal is described as a light connection state, but as described above, the light connection state is a state of the RRC idle state while the base station and the core network connection to the terminal are maintained.
  • the present invention corresponds to an exemplary name indicating a state of performing some operations, but the present invention is not limited to the corresponding name.
  • FIG. 2 is a flowchart illustrating an operation of a terminal according to an exemplary embodiment.
  • the terminal for changing a connection state performs a step of receiving a radio resource control (RRC) message including indication information indicating a state change from a base station to a light connection state (S210). ).
  • RRC radio resource control
  • Instruction information for instructing to change the connection state of the terminal to the light connection state may be transmitted by the base station.
  • the indication information may be included in the RRC connection release message.
  • the indication information may be included in the RRC connection reconfiguration message.
  • the terminal should perform an operation for changing the connection state of the terminal and the base station to the light connection state.
  • the terminal may transmit the terminal capability information to the base station to inform whether the terminal supports the light connection state.
  • the terminal performs the step of configuring the connection state of the terminal to the light connection state based on the indication information (S220). For example, when the terminal receives indication information indicating a state change to the light connection state from the base station, the terminal stops all SRBs and DRBs for the base station. However, unlike the RRC idle state, the terminal may store the terminal context. In this case, the base station also stores the terminal context for the terminal. Through this, when the UE in the light connection state transitions to the RRC connection state, the UE and the base station may perform fast data transmission and reception using the stored UE context again. In addition, the UE in the write connection state may perform a cell reselection operation instead of handover. That is, since the RRC connection of the terminal is similar to the released state with the base station, when the terminal is moved, the terminal may perform a procedure of reselecting a cell.
  • the indication information indicating a state change to the light connection state from the base station
  • the terminal stops all SRBs and DRB
  • the terminal performs a step of receiving a paging message for the terminal (S230).
  • the paging message for the terminal in the light connection state may be a paging message triggered by the core network or a RAN initiated paging message.
  • the RAN initiation paging message refers to a paging message triggered at a base station or a base station RRC layer, not a paging message triggered by a core network or a core network upper layer (eg, Non Access Stratum).
  • the paging message may include a terminal identifier.
  • the terminal identifier may be one of a first terminal identifier assigned by an upper layer (eg, Non Access Stratum) of the terminal and a second terminal identifier assigned by the base station.
  • an upper layer eg, Non Access Stratum
  • the terminal performs a step of determining a connection state change of the terminal based on the terminal identifier included in the paging message (S240). For example, when a terminal receives a paging message, the terminal extracts a terminal identifier of the paging message, compares the extracted terminal identifier with a terminal identifier previously stored in the terminal, and changes the connection state of the terminal according to the result. You can decide.
  • the terminal may determine the connection state change of the terminal to the RRC IDLE state.
  • the terminal may determine to change the connection state to the RRC connection state.
  • the first terminal identifier may be an International Mobile Subscriber Identity (IMSI) or a SAE-Temporary Mobile Subscriber Identity (S-TMSI).
  • IMSI International Mobile Subscriber Identity
  • S-TMSI SAE-Temporary Mobile Subscriber Identity
  • the second terminal identifier may include base station identification information and information for identifying a terminal context allocated by the base station.
  • the terminal in the light connection state may change the connection state of the terminal to either IDLE or connection state according to which identifier the terminal identifier of the received paging message matches.
  • FIG. 3 is a flowchart illustrating an operation of a base station according to an embodiment.
  • the base station controlling the connection state of the terminal performs a step of transmitting a radio resource control (RRC) message including indication information indicating a state change to a light connection state to the terminal.
  • RRC radio resource control
  • the indication information may be included in the RRC connection release message and transmitted.
  • the base station needs to know whether the terminal supports the light connection state.
  • the base station may receive the terminal capability information from the terminal to confirm whether the terminal supports the light connection state.
  • the base station changes the connection state of the terminal to the light connection state (S320). For example, the base station stops all SRBs and DRBs for the terminal when the terminal transitions to the right connection state. However, unlike the RRC idle state, the base station may store the terminal context of the terminal. Through this, when the UE in the light connection state transitions to the RRC connection state, the UE and the base station may perform fast data transmission and reception using the stored UE context again.
  • the base station transmits a paging message including the terminal identifier to the terminal to trigger a connection state change of the terminal (S330).
  • the base station may transmit a paging message to the terminal in the light connection state.
  • the paging message may be a paging message triggered in the core network, or may be a RAN initiated paging message.
  • the terminal identifier included in the paging message may be any one of a first terminal identifier assigned by an upper layer (eg, Non Access Stratum) of the terminal and a second terminal identifier assigned by the base station.
  • the first terminal identifier may be an International Mobile Subscriber Identity (IMSI) or a SAE-Temporary Mobile Subscriber Identity (S-TMSI).
  • the second terminal identifier may include base station identification information and information for identifying a terminal context allocated by the base station.
  • the connection state of the terminal may be changed to the RRC IDLE state.
  • the connection state of the terminal may be changed to the RRC connection state.
  • the base station may further perform the step of receiving the paging information for the paging message transmission from the core network control plane entity (S300).
  • the step S300 is described as being performed before the step S310, but the step S300 may be transmitted at various times as necessary before transmitting the paging message in step S330. That is, the base station may receive paging information from the core network control plane entity before transmitting the paging message to the terminal.
  • the core network control plane entity may be an MME.
  • the MME may deliver paging information required by the base station to the base station to transmit the paging message to the terminal.
  • the paging information may be received in an initial context setup request message.
  • the paging information may include one or more of paging DRX, UE identification index, and cell area information.
  • the base station may transmit a paging message to the terminal in the light connection state using the paging information.
  • the base station should accurately recognize the capability of the terminal (hereinafter, referred to as UE or terminal for convenience of description, which may mean a 5G terminal as well as an LTE terminal) in order to provide a proper configuration to the terminal.
  • RRC signaling carries AS capabilities and NAS signaling carries NAS capabilities.
  • the core network control plane entity (for example, MME, hereinafter referred to as core network control plane entity as MME) stores UE capabilities (or terminal capability consisting of UE Radio Access Capability and UE Core Network Capability).
  • UE Core Network Capability may be indicated by the UE through NAS signaling (attach procedure, etc.).
  • UE Radio Access Capability may be delivered from the terminal to the base station using the UE capability transfer procedure and may be delivered through the S1 interface.
  • the UE Radio Access Capability may be indicated by the terminal to the MME through NAS signaling (attach procedure, etc.) and delivered to the base station through the S1 interface.
  • the MME transmits UE Radio Access Capability to the base station whenever the UE enters RRC Connected. For example, the MME may transmit UE radio capability to the base station through an S1 Initial context setup request message.
  • the base station may request UE capability information from the terminal if necessary. For example, after the handover is completed, the base station may obtain UE capability information from the terminal using a UE capability transfer procedure and then transfer it to the MME.
  • information for indicating that the write connection is supported may be defined in UE capability information (eg, UE radio capability information).
  • the information indicating that the write connection is supported may be defined by modifying / extending UE capability information for NB-IoT suspend / resume (or AS context caching).
  • the base station may receive information for indicating that the terminal supports the write connection by using the above-described methods.
  • the base station may determine whether the corresponding terminal supports the write connection using the terminal capability information. If necessary, the base station may transmit the indication information for changing to the light connection state to the connection state of the terminal.
  • the base station may transmit to the terminal an RRC connection release message indicating the release of the write connection (releasecause).
  • the terminal may perform an operation for the light connection state.
  • the terminal operation for the write connection state indicates that one or more of the following operations are performed.
  • NAS Non Access Stratum and / or a user plane radio bearer higher layer
  • the data is transferred to the PDCP buffer mapped to the bearer in consideration of the RRC connected state. If a radio resource suspend operation is performed according to the light connection state transition and the PDCP entity is suspend, data transmission cannot be performed. Therefore, if the terminal receiving the RRC connection release message indicating the cause of the release of the light connection does not indicate the state of the light connection to the upper layer, the PDCP must be maintained in the light connection state (or the PDCP must be kept the same as the connection state). do). When data is received in the PDCP buffer, it must be able to initiate a transition to the RRC connection. For example, when the terminal receives the PDCP SDU from the PDCP entity in the light connection state, the UE may request a transition from the light connection state to the connected state in the RRC.
  • the UL Information Transfer RRC message may be transmitted to the base station in consideration of the RRC connected state. Since the UE RRC entity may know that the UE is in the light connection state, when an outgoing signaling (for example, MO signaling or NAS signaling) to be transmitted may occur, the UE may initiate a transition to the RRC connection state.
  • outgoing signaling for example, MO signaling and NAS signaling
  • the UE may indicate the light connection state to a higher layer.
  • the upper layer may distinguish the light connection state.
  • the upper layer (eg, NAS) of the terminal may not trigger the service request procedure.
  • sending data MO data
  • the RRC connection in the light connection state to the lower layer (eg RRC) of the upper layer (eg, NAS or IP) of the terminal.
  • the transition to the state can be indicated.
  • the RRC may initiate a transition from the light connection state to the RRC connected state when receiving a transition indication from the upper layer to the RRC connected state. Even if the transition from the higher layer to the RRC connected state is not instructed, the RRC may detect the origination data generation at the upper layer and initiate the transition from the light connection state to the RRC connected state.
  • the upper layer (eg, NAS) of the terminal may not trigger a service request procedure.
  • the upper layer (eg, NAS) of the terminal may indicate a transition from the light connection state to the RRC connection state to the lower layer (eg, RRC).
  • the RRC may initiate a transition from the light connection state to the RRC connection state when receiving a transition indication from the upper layer to the RRC connection state in the light connection state. That is, upon receiving a transition indication from the upper layer to the connected state in the light connection state on the RRC, the RRC may initiate the transition from the light connection state to the connected state.
  • the terminal When the UE initiates the transition to the RRC connected state by receiving a transition indication from the upper layer to the connected state in the light connection state, the terminal transmits corresponding NAS signaling information (eg, the transition indication to the light connection state) to the base station. There is no need to pass it through to the core network.
  • NAS signaling information eg, the transition indication to the light connection state
  • the UE may indicate the light connection state to a higher layer.
  • the upper layer may distinguish the light connection state.
  • an upper layer eg, NAS
  • NAS eg, NAS
  • an upper layer eg, NAS
  • NAS eg, an attach procedure or a TAU procedure
  • the upper layer (eg, NAS) of the terminal may trigger a new NAS procedure for transitioning from the light connection state to the RRC connection state.
  • the UE When initiating the above-described NAS procedure (one of a service request procedure, an attach procedure, a TAU procedure, and a new NAS procedure) from an upper layer, the UE may recognize that the RRC is in the light connection state, and thus the UE is in the RRC connection state in the light connection state.
  • the transition to the furnace can be performed.
  • the above-described NAS procedure may be performed between the terminal and the core network entity.
  • the above-described NAS procedure may not be performed between the terminal and the core network entity, and only a transition to the RRC connection state may occur, and then the RRC may respond to the NAS.
  • only the transition to the RRC connection state is performed, and the terminal does not need to transmit corresponding NAS signaling information (eg, a transition indication to the light connection state) through the base station to the core network.
  • the base station When the base station recognizes that the terminal supports the write connection, the base station may define information for indicating the write connection in the RRC connection reconfiguration message and indicate it to the terminal.
  • the UE may perform an operation for the right connection state.
  • the terminal operation for the write connection state indicates that one or more of the following operations are performed.
  • RRC IDLE terminal Perform some or all of the operations of the RRC IDLE terminal (eg, one or more of cell reselection, paging, and suspend of radio resources);
  • the base station may include additional configuration information for instructing the terminal further detailed operation in the light connection state.
  • the terminal cannot transmit the RRC Connection Reconfiguration Complete message to the base station. For example, if the SRB for delivering the RRC message is suspend, the RRC signaling cannot be delivered. Alternatively, if the MAC is reset or if the radio configuration information of the cell is suspend, the RRC connection reconfiguration confirmation message cannot be delivered to the base station.
  • the terminal that has received the RRC connection reconfiguration message including information for indicating the right connection may not transmit the RRC connection reconfiguration confirmation message to the base station.
  • the terminal that receives the RRC connection reconfiguration message including information for indicating the light connection may first respond to the RRC connection reconfiguration confirmation message to the base station and then apply the light connection.
  • the information for indicating the write connection may be received through a downlink RRC message distinguished from the RRC connection reconfiguration message.
  • This downlink RRC message may be defined as a message that does not require a success or confirmation message.
  • the terminal may enter the light connection state by receiving this downlink message.
  • the terminal does not need to deliver an acknowledgment or failure message for this downlink RRC message to the base station.
  • a function for performing an operation for indicating an RRC connection reconfiguration confirmation message to a base station can be maintained until a certain time or until a certain criterion is satisfied.
  • a terminal that receives an RRC connection reconfiguration message including information for indicating a light connection may operate a timer for transitioning to a light connection.
  • the terminal receives the RRC connection reconfiguration message including information for indicating the right connection, the terminal starts the timer.
  • the timer expires, it transitions to the light connection.
  • the terminal may transmit an RRC connection reconfiguration confirmation message to the base station until the timer expires.
  • the base station transmits the indication information to the terminal through the RRC message
  • the terminal may configure the light connection based on the indication information.
  • the terminal may change the connection state of the terminal by receiving a paging message.
  • the terminal in the light connection state may perform a state transition to the RRC connected state or the RRC idle state according to the type of the terminal identifier of the paging message. Accordingly, a terminal paging method for a write connection terminal is proposed.
  • FIG. 4 is a diagram illustrating a paging message processing procedure in a mobile situation of the terminal according to an embodiment.
  • the terminal 400 and the anchor base station 420 may configure a light connection state (S410).
  • the anchor base station 420 may instruct the terminal 400 to change the state to the light connection state.
  • the terminal 400 configures a light connection state with the anchor base station 420.
  • a base station indicating a connection state of a terminal as a light connection state is described as an anchor base station or a base station (which is generally described as a base station when the movement of the terminal is not assumed), and when the terminal moves, the cell A base station that is selected by the reselection operation and establishes a connection with a terminal after moving is referred to as a serving base station.
  • the write connection state terminal 400 may perform a cell reselection operation according to the movement (S420).
  • the terminal 400 needs to update information on cell reselection by performing a mobility operation through cell reselection rather than handover. Therefore, the terminal 400 may perform an update process according to the cell reselection with the serving base station 410 (S430).
  • the serving base station 410 shares information (eg, paging information) obtained in the process of updating with the terminal 400 with the anchor base station 420 (S440). Through this, the anchor base station 420 may check which cell the terminal 400 is located to process the paging message.
  • information eg, paging information
  • a connection (eg, S1 connection) is maintained between the core network CN and the wireless network RAN. Therefore, when the downlink data arrives, the core network transmits the data to the anchor base station 420 (S450).
  • the anchor base station 420 performs a paging procedure when downlink data arrives from the core network. For example, the anchor base station 420 transfers paging to the serving base station 410 where the terminal 400 is located according to the cell reselection (S460), and the serving base station 410 transmits the paging message to the terminal 400. do.
  • the terminal 400 When the terminal 400 receives the paging message and changes the connection state to the RRC connection state, the terminal 400 transmits an RRC connection resumption message to the serving base station 410 (S480). Through this, the connection state of the terminal 400 may be changed from the light connection state to the RRC connection state.
  • the base station may not know in which cell the terminal is located.
  • the anchor base station when downlink data arrives at the anchor base station, the anchor base station performs paging to the terminal before transmitting the data (user data or signaling data) transmitted to the anchor base station instructing the terminal to transition to the light connection state. It is necessary to allow the terminal to transition to the RRC connection state.
  • the base station may perform paging by using the following detailed embodiments individually or in combination.
  • the core network In the right connection state, the core network cannot know that the terminal is in the light connection state, and considers that the terminal is in the connected state as the S1 connection is maintained. Therefore, when there is a signaling message to be transmitted to the terminal by the core network entity, the core network entity delivers downlink data to the anchor base station.
  • the anchor base station may request paging to the MME.
  • a downlink NAS message eg, a DOWNLINK NAS TRANSPORT message
  • MME control plane core network entity
  • the MME initiates a paging procedure to perform paging to the terminal.
  • the RRC connection resume operation (for example, transmitting an RRC connection resume message) is performed to transition from the light connection state to the RRC connection state.
  • the serving base station is a terminal contact from the anchor base station. You can query / fetch / interrogate the disk to transition to an RRC connection.
  • the serving base station may establish a connection with the anchor base station.
  • the anchor base station forwards the downlink NAS message to the serving base station.
  • the serving base station delivers this to the terminal.
  • the serving base station which has performed the RRC connection resumption to transition from the light connection state to the RRC connection state by paging, may transmit a confirmation message about the paging success to the core network entity.
  • the anchor base station may request paging to the MME.
  • the user plane core network entity e.g, Serving GW
  • the MME initiates a paging procedure to perform paging to the terminal.
  • the RRC connection resume operation (for example, transmitting an RRC connection resume message) is performed to transition from the light connection state to the RRC connection state.
  • the serving base station receives the terminal context from the anchor base station / fetch / interrogate and returns to the RRC connected state. You can transition.
  • the serving base station may establish a connection with the anchor base station. When a connection is established between the anchor base station and the serving base station, the anchor base station delivers downlink data to the serving base station. The serving base station delivers this to the terminal.
  • the serving base station which has performed the RRC connection resumption to transition from the light connection state to the RRC connection state by paging, may transmit a confirmation message about the paging success to the core network entity.
  • the anchor base station may perform paging directly into a corresponding base station cell or a corresponding terminal location prediction region.
  • the anchor base station may request paging to the core network entity.
  • the anchor base station may release the stored terminal context.
  • the anchor base station may consider the terminal as an RRC IDLE state.
  • the core network In the right connection state, the core network cannot know that the terminal is in the light connection state, and the terminal considers the connection state as the S1 connection is maintained. Therefore, when there is a signaling message to be transmitted to the terminal by the core network entity, the core network entity delivers downlink data to the anchor base station.
  • an anchor base station when an anchor base station receives a downlink NAS message (eg, a DOWNLINK NAS TRANSPORT message) from a control plane core network entity (eg, MME), it starts paging by a cell or anchor base station associated with the anchor base station. Paging can be initiated to a possible cell.
  • a downlink NAS message eg, a DOWNLINK NAS TRANSPORT message
  • MME control plane core network entity
  • the anchor base station Since the anchor base station does not receive the paging message from the control plane core network entity, information for paging must be stored together in order for the anchor base station to directly start paging to the terminal. That is, since paging is initiated in the RAN layer, information for RAN initiated paging should be stored.
  • the information for RAN-initiated paging will be described by describing information for paging or configuration information for RAN-initiated paging.
  • the anchor base station obtains information for initiating paging.
  • the anchor base station may transmit information indicating a light connection state to the terminal and request information for paging generated by the core network from the core network entity when the terminal transitions to the light connection state.
  • the information received by the anchor base station through the core network entity may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • information for requesting and receiving information about paging generated by the core network from the core network entity is information for paging generated by the core network defined in 3GPP TS 36.413, an interface standard between the MME and the base station. .6 PAGING information).
  • the information for paging generated by the core network may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • the terminal identification information indicates terminal identification information (terminal identification information index) for calculating a paging frame and indicates an IMSI mod 1024.
  • UE specific DRX represents DRX information signaled by the terminal to a core network entity (MME) or paging DRX information configured in the terminal by a core network entity during a core network procedure (eg, a network registration procedure).
  • MME core network entity
  • the UE specific DRX may be modified by the base station, in which case the base station may inform the UE specific DRX to the MME. Alternatively, it can be used by transparently modifying the MME.
  • the source of paging cn-Domain is information indicating that paging is generated from the CS or PS domain.
  • the cell area information to which the light connection is indicated / configured represents cell area information (Tracking Area Identity) for identifying the tracking area configured by the core network entity.
  • the anchor base station is a downlink data (for example, DOWNLINK NAS TRANSPORT) in the connection (connection between the control plane core network entity and the base station, for example, S1-C connection) of the terminal with respect to the terminal configured in the light connection state Message), request information for paging through the control plane core network entity (eg, MME).
  • the information requested by the anchor base station through the core network entity may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information directed / configured for a light connection. have.
  • the anchor base station is a downlink data (for example, user plane data) in the connection of the terminal (user plane core network entity and the base station connection, for example, S1-U connection) for the terminal configured in the light connection state Received may request information for paging through the control plane core network entity (for example, MME).
  • the information requested by the anchor base station through the core network entity may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • the base station may buffer the downlink data until the inquiry / fetch / interrogate / request to receive the paging information.
  • the base station may monitor data reception on the S1 connection associated with the terminal when configuring the light connection state to the terminal.
  • the base station can know the terminal supporting the write connection through the terminal capability information.
  • the base station delivers the corresponding terminal context for the terminal supporting the write connection to the base station, the base station may include information for paging.
  • the control plane core network entity may transmit information including paging information to an initial context setup request message to a base station.
  • the information for paging included in the initial context setup request message may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • the information for paging received by the core network indicates information for paging generated by the core network (9.1.6 PAGING information) previously defined in 3GPP TS 36.413, which is an interface standard between the MME and the base station. .
  • the information for paging generated by the core network may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • the terminal identification information indicates terminal identification information (terminal identification information index) for calculating a paging frame and indicates an IMSI mod 1024.
  • UE specific DRX represents DRX information signaled by the terminal to a core network entity (MME) or paging DRX information configured in the terminal by a core network entity during a core network procedure (eg, a network registration procedure). .
  • the UE specific DRX may be modified by the base station, in which case the base station may inform the UE specific DRX to the MME. Alternatively, it can be used by transparently modifying MME.
  • the source of paging cn-Domain is information indicating that paging is generated from the CS or PS domain.
  • the cell area information to which the light connection is indicated / configured represents cell area information (Tracking Area Identity) for identifying the tracking area configured by the core network entity.
  • the terminal when the terminal receives an RRC message indicating a right connection from the base station, the terminal may include information for paging in the response message and transmit the information to the base station.
  • the information for paging may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • the NAS layer of the terminal may perform the step of previously receiving information for paging generated by the core network.
  • the terminal configured in the light connection state may transmit information including paging information to the base station when requesting to resume the RRC connection in order to transition from the light connection state to the RRC connection state.
  • the information for paging may include one or more of terminal identification information, source cn-Domain of the paging, and UE specific DRX information.
  • the terminal configured in the light connection state may request the resumption of the RRC connection in order to transition from the light connection state to the RRC connection state and receive an acknowledgment or response message.
  • the terminal may transmit information to the base station by including information for paging in the RRC message for transition to the light connection state.
  • the information for paging may include one or more of terminal identification information, source cn-Domain of the paging, and UE specific DRX information.
  • the terminal configured in the light connection state requests to resume the RRC connection in order to transition from the light connection state to the RRC connection state.
  • information request indication information for paging may be received in an acknowledgment / response message for the RRC connection resumption request.
  • the UE may transmit information to the base station, including information for paging, to the RRC message (or to the RRC message for transitioning to the light connection state).
  • the information for paging may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for the right connection.
  • the terminal configured in the right connection state may perform cell reselection according to the movement.
  • the terminal may transmit configuration information for RAN start paging for the terminal to the anchor base station.
  • the base station may configure information for instructing such an operation in the terminal.
  • the configuration information for RAN-initiated paging may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • the base station may transmit configuration information for the RAN start paging for the terminal in the light connection state to the anchor base station.
  • the configuration information for RAN-initiated paging may include one or more of terminal identification information, source cn-Domain of paging, UE specific DRX information, and cell area information indicated / configured for a right connection.
  • the base station may configure additional information in the terminal for indicating such an operation. For example, the terminal may configure period / timer information to trigger an update, information on the number of cell reselections to trigger an update, and cell region information (triggering out of the corresponding cell region information) to trigger an update.
  • the terminal may deliver information for paging to the anchor base station when the trigger condition is met.
  • the base station For the transition from the light connection state to the connected state, the base station initiates paging and the terminal may receive a paging message.
  • the terminal identifier included in the paging record is the terminal identifier of the terminal
  • the terminal identifier may be indicated to a higher layer. For example, the terminal may check whether the terminal identifier included in the paging message matches the terminal identifier allocated in the upper layer of the terminal.
  • the terminal is a terminal identifier included in the paging record matches the terminal identifier of the terminal, and the cause of the paging to indicate the transition from the light connection state to the connected state (or to indicate a light state paging) If so, the terminal identifier may be indicated to a higher layer.
  • the UE may indicate the paging cause together with the higher layer.
  • the upper layer receives a paging instruction that causes the paging transition from the light connection state to the RRC connected state, the upper layer instructs the lower layer (eg, the RRC layer) to transition from the light connection state to the RRC connected state. can do.
  • the terminal may initiate the transition from the light connection state to the RRC connection state.
  • the UE may perform RRC connection resumption without notifying the upper layer of the transition from the light connection state to the RRC connected state. Since the RRC connection resume is performed in the upper layer without interaction, the terminal identifier included in the paging record may use the terminal identifier assigned by the base station.
  • the terminal indicates that the terminal identifier included in the paging record matches the terminal identifier of the terminal, and the paging cause is for indicating a transition from the light connection state to the RRC connection state (or indicates a light state paging). ), The terminal may initiate the transition from the light connection state to the RRC connection state.
  • the terminal may determine the change of the connection state of the terminal by using the terminal identifier included in the paging message.
  • the terminal may ignore or remove the paging message. . That is, the paging message is not processed on the RRC layer.
  • the serving base station may continue the RRC connection resumption procedure to transition from the light connection state to the RRC connected state.
  • the anchor base station may continue the signaling procedure for transitioning to the RRC connected state.
  • the anchor base station removes / releases / aborts / discards / stops the paging procedure.
  • the serving base station receiving the RRC connection resumption request requested by the terminal configured in the light connection state to transition to the RRC connection state from the light connection state may receive a paging message while delivering it to the anchor base station.
  • the serving base station may ignore / discard / remove / release the paging message. If the paging message is received in the light connection state, the terminal may ignore the paging. Therefore, the paging message received from the anchor base station on the serving base station RRC layer is not delivered to the terminal.
  • the serving base station may send the cause information about this to the anchor base station.
  • the serving base station may continue the RRC connection resumption procedure to transition from the light connection state to the RRC connected state.
  • the anchor base station When the anchor base station initiates a paging procedure, when receiving a signaling from the serving base station to transition to the RRC connected state in the light connection state, the anchor base station may continue the signaling procedure to transition to the RRC connected state. In this case, the anchor base station removes / releases / aborts / discards / stops the paging procedure.
  • the downlink data for the terminal configured in the light connection state may be generated and a paging message may be transmitted to transition from the light connection state to the RRC connection state.
  • paging may fail for any reason (eg, terminal power off, out of coverage, etc.).
  • the base station may instruct the corresponding terminal to release the connection state to the core network.
  • the terminal may send a terminal context deactivation or terminal context release message to the control plane core network entity (eg, MME).
  • the anchor base station may discard the buffered user data.
  • Paging using IMSI one of the core network terminal identifiers, may be an abnormal procedure used for error recovery in a network. If S-TMSI, which is one of the core network terminal identifiers, is not available due to network failure, the network may initiate paging for an EPS service using IMSI. For example, paging may be started by including the IMSI in the terminal identifier.
  • the anchor base station may transmit paging using the IMSI to the terminal. For example, a paging message including the IMSI in the terminal identifier may be transmitted to the terminal.
  • the terminal may indicate this to a higher layer.
  • the terminal may receive a paging message so that the terminal configured in the light connection state transitions from the light connection state to the RRC connection state.
  • the terminal may indicate a paging message or cause information thereof to a higher layer.
  • the UE may transition to the RRC IDLE state.
  • a terminal that is initiated by the core network and receives a paging message including the terminal identifier of the upper layer as the terminal identifier for the terminal in the right connection may transition to the RRC IDLE state and indicate this to the upper layer.
  • RRC CONNECTED Upon leaving RRC CONNECTED and transitioning to the RRC IDLE state, all radio resources are released, including entity and MAC release for all configured radio bearers.
  • the higher layer may initiate the NAS procedure by indicating the terminal identifier and the cause information to the higher layer.
  • a paging message including S-TMSI in the terminal identifier may be transmitted to the terminal.
  • the terminal may indicate this to a higher layer.
  • the terminal may receive a paging message so that the terminal configured in the light connection state transitions from the light connection state to the RRC connection state.
  • the terminal may indicate a paging message or cause information thereof to a higher layer.
  • the UE may transition to the RRC IDLE state.
  • a terminal that is initiated by the core network and receives a paging message including the terminal identifier of the upper layer as the terminal identifier for the terminal in the right connection may transition to the RRC IDLE state and indicate this to the upper layer.
  • RRC CONNECTED Upon leaving RRC CONNECTED and transitioning to the RRC IDLE state, all radio resources are released, including entity and MAC release for all configured radio bearers.
  • the higher layer may initiate the NAS procedure by indicating the terminal identifier and the cause information to the higher layer.
  • the terminal in a light connection state receives a paging message, but the information included in the paging message has a core network terminal identifier such as IMSI or S-TMSI, the terminal is in an RRC idle state in the light connection state. Can be changed.
  • the higher layer can locally disable the EPS bearer context and detach from the EPS.
  • the UE may perform an attach procedure after local detach.
  • the terminal may perform a service request procedure.
  • the base station may instruct the terminal to transition from the light connection state to the RRC idle state.
  • the UE may transition to the RRC idle state by receiving the RRC Connection Release message. If the terminal transitions from the light connection state to the RRC idle state, the terminal releases all radio resources including release of the RLC entity, MAC configuration and associated PDCP entity for all configured radio bearers. In addition, the terminal releases / removes the stored terminal context provided by the base station.
  • the UE may instruct release of the RRC connection together with the release cause.
  • the UE does not instruct the upper layer to release the RRC connection.
  • the terminal in the write connection state is not an RRC connection state, and thus does not perform a handover operation. Accordingly, the write connection state terminal may perform a cell reselection operation according to the movement of the terminal.
  • the base station may perform RAN-initiated paging for the corresponding terminal.
  • the terminal identification information of the base station for identifying the base station configured to the light connection state And / or terminal identification information of the cell may be required.
  • the following information may be used individually or in combination with the light connection state terminal identification information.
  • the terminal identification information (S-TMSI) of the core network consists of a core network entity code (MMEC) and identification information (M-TMSI) temporarily assigned by the core network entity. Therefore, the terminal can be uniquely identified within the core network entity.
  • the MME In order to use the terminal identification information of the core network as the terminal identification information in the RAN-initiated paging, the MME must transmit it to the base station before the RAN-initiated paging.
  • the terminal can be uniquely combined with the cell identification and the radio network assignment identification assigned by the base station that has received the cell to identify the terminal context. Can be.
  • RAN-initiated paging may be performed using an identifier created by combining cell identification information and information allocated by the base station to identify a terminal context as terminal identification information.
  • a base station in the network can be uniquely identified through the base station identification information
  • the terminal can be uniquely combined with the base station identification information and the wireless network temporary identification information allocated by the base station to identify the terminal context.
  • RAN-initiated paging may be performed using an identifier generated by combining base station identification information and information allocated by the base station to identify a terminal context as terminal identification information.
  • the terminal can be uniquely combined with the CU identification information and the wireless network temporary identification information temporarily allocated by the CU.
  • RAN-initiated paging may be performed using an identifier created by combining CU identification information and information allocated by the base station to identify a terminal context as terminal identification information.
  • the UE in the right connection state may transmit and receive data by performing a transition to the RRC connection state.
  • the terminal in the light connection state performs the transition operation to the RRC connected state.
  • the UE when there is uplink data or signaling in the UE in the light connection state (for MO data or MO signaling) or when the UE in the light connection state receives paging, the UE switches to the RRC connection state in the cell. (Alternatively, the RRC connection may be resumed or the transition to the RRC connection state may be described as a transition from the light connection state to the RRC connection state or the transition to the RRC connection state for convenience of explanation.)
  • the terminal may transmit the RRC Connection request message to the base station through a common control channel (eg, CCCH).
  • a common control channel eg, CCCH
  • a value received from the upper layer may be set as a terminal identifier (ue-Identity).
  • a setting cause value corresponding to the information received from the upper layer may be set.
  • the setting cause value may mean information about a trigger cause that causes a transition to the RRC connection state.
  • the terminal may add information indicating a transition from the light connection state to the RRC connection state.
  • the UE may add information indicating a transition from the light connection state to the RRC connection state to the RRC Connection setup complete message.
  • a value indicating the transition from the light connection state to the RRC connection state can be set as a setting cause.
  • the terminal may transmit the RRC Connection Reset Request message to the base station through a common control channel (eg, CCCH).
  • a common control channel eg, CCCH
  • the terminal sets the C-RNTI used in the cell indicating the write connection state to c-RNTI.
  • the terminal sets the physical cell identifier in the cell indicating the write connection state to phyCellId.
  • the terminal sets the MAC-I to the calculated MAC-I 16 least significant bits.
  • the terminal may set a value indicating a redirection cause (reestablishmentsCause) from the light connection state to the RRC connection state.
  • the terminal identifier may set a stored value received from the base station. This will be described later.
  • the terminal may transmit an RRC Connection Resumption Request message to the base station through a common control channel (eg, CCCH).
  • a common control channel eg, CCCH
  • the terminal identifier may set a stored value received from the base station. This will be described later.
  • the setting cause value may include cause information that triggers a transition to the RRC connection state.
  • the setting cause value may include information indicating any one of paging message reception, origination data trigger, or origination signaling trigger.
  • the terminal may add information indicating a transition from the light connection state to the RRC connection state.
  • the UE may add information indicating a transition from the write connection state to the RRC connection state to the RRC Connection resume complete message.
  • a value indicating the transition from the light connection state to the connected state can be set as a setting cause.
  • the terminal sets the MAC-I to the calculated MAC-I 16 least significant bits.
  • the terminal may transmit a new RRC Connection request message to the base station through a common control channel (eg, CCCH).
  • a common control channel eg, CCCH
  • the terminal identifier may set a stored value received from the base station. This will be described later.
  • a setting cause value corresponding to the information received from the upper layer may be set.
  • the terminal may add information indicating a transition from the light connection state to the RRC connection state.
  • the UE may add information indicating a transition from the write connection state to the RRC connection state in the RRC Connection resume complete message.
  • a value indicating the light connection transition may be set as a setting cause.
  • the terminal sets the MAC-I to the calculated MAC-I 16 least significant bits.
  • FIG. 5 is a diagram illustrating an example of a terminal configuration.
  • the terminal 500 for changing a connection state receives a radio resource control (RRC) message including instruction information indicating a state change from a base station to a light connection state. And a control unit 510 configured to configure the connection state of the terminal to the light connection state based on the indication information.
  • RRC radio resource control
  • the receiving unit 530 may further receive a paging message for the terminal, and the control unit 510 may determine the connection state change of the terminal based on the terminal identifier included in the paging message.
  • the controller 510 may stop all signaling radio bearers (SRBs) and data radio bearers (DRBs) of the terminal, but store the terminal context to configure a light connection state. If the terminal identifier included in the paging message matches the first terminal identifier assigned by the upper layer of the terminal, the controller 510 determines the connection state change to the RRC IDLE state, and the terminal identifier included in the paging message is determined by the base station.
  • SRBs signaling radio bearers
  • DRBs data radio bearers
  • the first terminal identifier is an International Mobile Subscriber Identity (IMSI) or a SAE-Temporary Mobile Subscriber Identity (S-TMSI), and the second terminal identifier is a base station identification information for identifying a terminal context allocated by the base station. Information may be composed of information.
  • IMSI International Mobile Subscriber Identity
  • S-TMSI SAE-Temporary Mobile Subscriber Identity
  • the terminal 500 may further include a transmitter 520.
  • the transmitter 520 may transmit the terminal capability information indicating that the light connection is supported to the base station.
  • the transmitter 520 may transmit an RRC connection resumption request message requesting to change the connection state of the terminal from the light connection state to the RRC connection state to the base station.
  • the controller 510 may perform a cell reselection operation instead of handover.
  • the receiver 530 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the controller 510 controls the operation of the overall terminal 500 according to the state transition operation to the above-described light connection state and paging message processing.
  • the transmitter 520 transmits uplink control information, data, and messages to the base station through the corresponding channel.
  • FIG. 6 is a diagram illustrating a configuration of a base station according to an embodiment.
  • the base station 600 connects a transmitter 620 and a terminal for transmitting a Radio Resource Control (RRC) message including indication information indicating a state change to a light connection state to a terminal.
  • RRC Radio Resource Control
  • the controller 610 may change the state to the light connection state.
  • the transmitter 620 triggers a connection state change of the terminal by transmitting a paging message including the terminal identifier to the terminal, and the controller 610 transmits all signaling radio bearers (SRBs) and data radio bearers (DRBs) of the terminal. While stopping, the terminal context may be stored to change the connection state of the terminal to the light connection state.
  • SRBs signaling radio bearers
  • DRBs data radio bearers
  • the terminal identifier may be any one of a first terminal identifier assigned by an upper layer (eg, Non Access Stratum) of the terminal and a second terminal identifier assigned by the base station.
  • a first terminal identifier assigned by an upper layer eg, Non Access Stratum
  • a second terminal identifier assigned by the base station e.g., RRC IDLE
  • the connection state of the terminal is changed to the RRC IDLE state
  • the connection state of the terminal is changed to the RRC connection state. Can be.
  • the base station 600 may further include a receiver 630 that receives paging information for transmitting a paging message from the core network control plane entity.
  • the receiver 630 receives paging information through an initial context setup request message.
  • the paging information may include one or more of paging DRX, UE identification index, and cell area information.
  • the controller 610 may generate and transmit a paging message to the terminal using the received paging information.
  • controller 610 controls the overall operation of the base station 600 for the light connection state transition operation and paging message processing of the terminal required to perform the above-described embodiments.
  • the transmitter 620 and the receiver 630 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiments.

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

Abstract

Le mode de réalisation de la présente invention concerne un procédé de signalisation de plan de commande permettant de diminuer la signalisation en fonction d'un changement de l'état de connexion d'un terminal, et un appareil associé. Plus précisément, le présent mode de réalisation concerne un procédé et un appareil permettant de changer un état de connexion à l'aide d'un message de radiomessagerie par un terminal dans un état de connexion légère. Un mode de réalisation concerne un procédé et un appareil permettant de changer un état de connexion par un terminal, le procédé comprenant les étapes consistant : à recevoir un message de commande de ressource radio (RRC) comprenant des informations d'indication indiquant un changement d'état vers un état de connexion légère à partir d'une station de base ; à configurer l'état de connexion du terminal pour le mettre en état de connexion légère sur la base des informations d'indication ; à recevoir un message de radiomessagerie pour le terminal ; et à déterminer qu'il convient de changer l'état de connexion du terminal sur la base d'une identification de terminal incluse dans le message de radiomessagerie.
PCT/KR2017/004432 2016-05-03 2017-04-26 Procédé et appareil de changement d'état de connexion de terminal WO2017191926A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US16/098,841 US10667322B2 (en) 2016-05-03 2017-04-26 Method and apparatus for changing connection state of terminal
CN201780027502.5A CN109076496B (zh) 2016-05-03 2017-04-26 用于改变终端连接状态的方法和装置

Applications Claiming Priority (6)

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KR10-2016-0054937 2016-05-03
KR10-2016-0054936 2016-05-03
KR20160054936 2016-05-03
KR20160054937 2016-05-03
KR1020170053295A KR102057212B1 (ko) 2016-05-03 2017-04-26 단말의 연결 상태 변경 방법 및 그 장치
KR10-2017-0053295 2017-04-26

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CN110012520A (zh) * 2018-01-05 2019-07-12 中国移动通信有限公司研究院 一种寻呼方法、设备及计算机可读存储介质
CN110012520B (zh) * 2018-01-05 2022-04-26 中国移动通信有限公司研究院 一种寻呼方法、设备及计算机可读存储介质
CN110149728A (zh) * 2018-02-13 2019-08-20 华为技术有限公司 无线资源控制rrc状态转换的方法与装置
WO2019157927A1 (fr) * 2018-02-13 2019-08-22 华为技术有限公司 Procédé et appareil de conversion d'état de commande de ressources radio (rrc)
CN110149728B (zh) * 2018-02-13 2020-09-29 华为技术有限公司 无线资源控制rrc状态转换的方法、通信装置、网络设备以及计算机存储介质
US11483894B2 (en) 2018-02-13 2022-10-25 Huawei Technologies Co., Ltd. Method and apparatus for switching radio resource control RRC state
US11785666B2 (en) 2018-02-13 2023-10-10 Huawei Technologies Co., Ltd. Method and apparatus for switching radio resource control RRC state
WO2020082248A1 (fr) * 2018-10-23 2020-04-30 Oppo广东移动通信有限公司 Procédé et dispositif de commande de mobilité d'un terminal, et terminal
CN113207153A (zh) * 2018-10-23 2021-08-03 Oppo广东移动通信有限公司 一种控制终端移动性的方法及装置、终端
CN113207153B (zh) * 2018-10-23 2022-08-16 Oppo广东移动通信有限公司 一种控制终端移动性的方法及装置、终端
US11856634B2 (en) 2018-10-23 2023-12-26 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method and device for controlling mobility of terminal, and terminal

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