WO2015064972A1 - Procédé et appareil de configuration de connexion double dans un réseau de communication mobile - Google Patents

Procédé et appareil de configuration de connexion double dans un réseau de communication mobile Download PDF

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Publication number
WO2015064972A1
WO2015064972A1 PCT/KR2014/010094 KR2014010094W WO2015064972A1 WO 2015064972 A1 WO2015064972 A1 WO 2015064972A1 KR 2014010094 W KR2014010094 W KR 2014010094W WO 2015064972 A1 WO2015064972 A1 WO 2015064972A1
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WO
WIPO (PCT)
Prior art keywords
base station
radio resource
resource configuration
additional radio
terminal
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Application number
PCT/KR2014/010094
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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.)
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Publication date
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to CN201480058780.3A priority Critical patent/CN105684491B/zh
Priority to US15/032,651 priority patent/US10362615B2/en
Publication of WO2015064972A1 publication Critical patent/WO2015064972A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to a process for a terminal to configure a dual connection with a plurality of base stations, and more particularly, when the terminal fails to perform additional radio resource configuration processing to use radio resources provided by different base stations.
  • a method and apparatus are disclosed.
  • LTE Long Term Evolution
  • LTE-Advanced of the 3GPP series require high-speed large-capacity communication systems capable of transmitting and receiving various data such as video and wireless data, beyond voice-oriented services.
  • a procedure for adding radio resources of another base station and initiating communication is required for a terminal performing communication through one base station to configure additional radio resources.
  • an additional radio resource configuration procedure is required for the terminal, which is communicating with the first base station, to additionally use radio resources of the second base station.
  • a terminal configures a dual connection with a plurality of base stations, a first signal including information for indicating additional radio resource configuration from the first base station to the second base station; Receiving a signal; starting a timer included in the first signal; attempting a random access with the second base station; and when the timer expires, adding the radio resource configuration failure indication information to the first base station.
  • 2 provides a method comprising transmitting a signal.
  • the present invention also provides a method for controlling a dual connectivity configuration of a terminal by a first base station, comprising: receiving a first signal including information for indicating additional radio resource configuration through a second base station from a second base station; And transmitting a first signal to a terminal through higher layer signaling and receiving a second signal including additional radio resource configuration failure indication information from the terminal.
  • the present invention is a terminal for configuring a dual connection with a plurality of base stations, the receiving unit for receiving a first signal including information for indicating additional radio resource configuration through the second base station from the first base station and the first signal And a transmitter for starting a timer included in the controller, attempting random access with the second base station, and transmitting a second signal including additional radio resource configuration failure indication information to the first base station when the timer expires.
  • the receiving unit for receiving a first signal including information for indicating additional radio resource configuration through the second base station from the first base station and the first signal
  • a transmitter for starting a timer included in the controller, attempting random access with the second base station, and transmitting a second signal including additional radio resource configuration failure indication information to the first base station when the timer expires.
  • the present invention provides a first base station for controlling the dual connectivity configuration of the terminal, receiving unit for receiving a first signal including information for indicating the additional radio resource configuration through the second base station from the second base station and the first And a transmitter for transmitting a signal to the terminal through higher layer signaling, wherein the receiver further provides a first base station apparatus for receiving a second signal including additional radio resource configuration failure indication information from the terminal.
  • the terminal provides a specific procedure for performing additional radio resource configuration through the second base station.
  • FIG. 1 is a diagram illustrating an example of a network configuration to which the present invention can be applied.
  • FIG. 2 is a diagram illustrating another example of a network configuration to which the present invention can be applied.
  • FIG. 3 is a diagram illustrating another example of a network configuration to which the present invention can be applied.
  • FIG. 4 is a diagram exemplarily illustrating operations of a terminal and a base station additionally configuring radio resources of a second base station according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an example of additional bearer separated radio resource configuration for additionally configuring radio resources of a second base station according to another embodiment of the present invention.
  • FIG. 6 is a diagram illustrating an example of additional bearer configuration without bearer separation that additionally configures a radio resource of a second base station according to another embodiment of the present invention.
  • FIG. 7 is a diagram illustrating another example of configuration of additional radio resources not separated by a bearer for additionally configuring radio resources of a second base station according to another embodiment of the present invention.
  • FIG. 8 is a diagram exemplarily illustrating operations of a terminal and a base station when additional radio resource configuration fails according to another embodiment of the present invention.
  • FIG. 9 is a diagram illustrating an example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • FIG. 10 illustrates another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • FIG. 11 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • FIG. 12 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • FIG. 13 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • FIG. 14 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • 15 is a diagram illustrating an example of additional radio resource configuration failure information according to another embodiment of the present invention.
  • 16 is a flowchart illustrating an embodiment of an operation of a terminal according to another embodiment of the present invention.
  • 17 is another flowchart illustrating another embodiment of an operation of a terminal according to another embodiment of the present invention.
  • FIG. 18 is a flowchart illustrating an embodiment of an operation of a base station according to another embodiment of the present invention.
  • 19 is another flowchart illustrating another embodiment of an operation of a base station according to another embodiment of the present invention.
  • 20 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
  • 21 is a diagram showing the configuration of a base station according to another embodiment of the present invention.
  • 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 terminal (user equipment) and a base station (base station, BS, or eNB).
  • a user terminal is a generic concept meaning a terminal in wireless communication.
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • HSPA High Speed Packet Access
  • MS Mobile Station
  • UT User Terminal
  • SS Global System for Mobile communications
  • GSM Global System for Mobile communications
  • 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 a viewpoint of a user terminal or a neighboring base station.
  • megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.
  • 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
  • OFDM-CDMA OFDM-CDMA
  • One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
  • the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
  • 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 expressed 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
  • Low power nodes represent nodes that use lower transmit (Tx) power than typical macro nodes.
  • CA Carrier Aggregation
  • the macro cell and the RRH cell are constructed to be scheduled under the control of one base station.
  • an ideal backhaul is required between the macro cell node and the RRH.
  • An ideal backhaul means a backhaul that exhibits very high throughput and very low latency, such as optical fiber, dedicated point-to-point connections using LOS microwaves (Line Of Sight microwave).
  • non-ideal backhaul backhaul that exhibits relatively low throughput and large delay, such as digital subscriber line (xDSL) and Non LOS microwaves.
  • the plurality of serving cells may be merged through the single base station-based CA technology described above to provide a service to the terminal. That is, a plurality of serving cells may be configured for a terminal in a Radio Resource Control (RRC) connected state, and when an ideal backhaul is established between the macro cell node and the RRH, the macro cell And the RRH cell may be configured with serving cells to provide a service to the terminal.
  • RRC Radio Resource Control
  • the terminal may have only one RRC connection with the network.
  • one serving cell is a Non-Access Stratum (hereinafter referred to as 'NAS') mobility information (e.g., TAI: Tracking Area Identity) and one serving cell provides security input in RRC connection reset / handover.
  • 'NAS' Non-Access Stratum
  • TAI Tracking Area Identity
  • SCells Secondary Cells
  • SCells may be configured as a serving cell together with a PCell.
  • the SCell is serviced only as an additional radio resource on the physical layer, and the PCell may use a channel quality indicator (CQI) and a measurement result for detecting a radio link problem in the SCell. .
  • CQI channel quality indicator
  • the PCell since the PCell could deactivate / remove the SCell, the Radio Link Monitoring (RLM) terminal procedure was not applied to the SCell.
  • RLM Radio Link Monitoring
  • the multi-carrier property of the physical layer only affects the MAC layer (Medium Access Control).
  • the MAC layer has one independent Hybrid Automatic Retransmit reQuest (HARQ) entity per serving cell in the uplink and downlink.
  • HARQ Hybrid Automatic Retransmit reQuest
  • each HARQ entity processes a data stream of a component carrier (CC).
  • CC component carrier
  • the addition and removal of SCells in the CA based on the single base station is performed by an RRC connection reconfiguration message.
  • RRC connection reconfiguration message When adding a new SCell, dedicated RRC signaling is used to send all the necessary system information of the SCell. That is, in the connected mode, the terminal does not need to directly obtain broadcast system information.
  • the terminal performs the addition or modification of the SCell when the RRC Connection Reconfiguration message received from the PCell includes the SCell addition modification list (sCellToAddModList). That is, the SCell corresponding to the cell identification is added to each SCell index sCellIndex included in the SCell add modification list sCellToAddModList that is not a part of the current terminal configuration.
  • SCellToAddModList SCell addition modification list
  • the lower layer configures the SCell to be considered deactivated.
  • the SCell configuration is modified for each SCell index (sCellIndex) included in the SCell add modification list (sCellToAddModList) that is part of the current terminal configuration.
  • the deactivated SCell in order to use the resources of the added / modified SCell, the deactivated SCell must be activated. That is, the carrier of the SCell may be used through an activation step separated from the SCell addition step.
  • the terminal configures the SCell addition
  • the SCell addition failure does not occur due to the failure of the SCell radio link. That is, in the conventional single base station-based CA technology, radio resource configuration for using radio resources provided by at least two different network points is performed through an RRC message including SCell additional information in a PCell and is activated separately. Because the radio resources configured through the steps are used, it is not necessary to consider the SCell radio link failure in the SCell radio resource configuration process.
  • the dual connectivity technique is a radio resource provided by at least two different network points (eg, a master base station and a secondary base station) connected by non-ideal backhaul in an RRC connected. Indicates the operation using
  • dual connectivity is a technique for a terminal to transmit and receive data through a cell associated with each of two different base stations, and is a technique for processing fast large data of the terminal.
  • the present invention provides a method and apparatus for handling a radio link failure problem that occurs in the process of adding / modifying a secondary base station radio resource in configuring a dual connection of a terminal.
  • the terminal configures dual connectivity, forms an RRC connection with the terminal, terminates the base station or S1-MME providing a PCell, which is a reference for handover, and provides a mobility anchor for the core network.
  • the base station which acts as a master base station or a 1st base station is described.
  • the master base station or the first base station may be a base station providing a macro cell, and may be a base station providing any one small cell in a dual connectivity situation between the small cells.
  • a base station that is distinguished from a master base station in a dual connectivity configuration and provides additional radio resources to a terminal is described as a secondary base station or a second base station.
  • the first base station (master base station) and the second base station (secondary base station) may provide radio resources to the terminal through at least one or more cells, respectively, the first base station and the second base station is an interface between the first base station and the second base station Can be connected through.
  • a cell associated with a first base station may be referred to as a macro cell, and a cell associated with a second base station may be referred to as a small cell to help understand the present invention.
  • a cell associated with the first base station may also be described as a small cell.
  • the macro cell in the present invention may mean each of at least one or more cells, and may be described as a generic term for all cells associated with the first base station.
  • the small cell may also mean each of at least one or more cells, and may also be described as a generic term for all cells associated with the second base station.
  • the cell may be a cell associated with the first base station.
  • the cell of the second base station may be described as another small cell or another small cell.
  • all cells associated with the first base station may mean a master cell group
  • all cells associated with the second base station may mean a secondary cell group.
  • the cell group may be used to mean a base station for configuring or controlling radio resources from a terminal perspective.
  • the master cell group may be used to distinguish the master base station or the first base station from the terminal point of view
  • the secondary cell group may be used to distinguish the secondary base station or the second base station.
  • the terminal may perform communication through the plurality of cells associated with the first base station and the plurality of cells associated with the second base station, and in this case, the above-described PCell function among the plurality of cells associated with the first base station
  • the specific cell may be described as the first base station PCell
  • the specific cell of the plurality of cells associated with the second base station may be described as the second base station PCell.
  • the second base station PCell refers to a cell that performs all or part of the functions of the PCell described above.
  • the existing single base station based CA technology does not need to consider the SCell radio link failure in the SCell configuration process.
  • the present invention devised to solve this problem provides a specific configuration procedure for using radio resources provided by one or more different base stations connected through non-ideal backhaul.
  • a radio link failure occurs in the process of configuring an additional radio resource that can be provided by the secondary base station to use the radio resource provided by one or more different base stations connected through the non-ideal backhaul, it is handled. It is an object of the present invention to provide a method and an apparatus capable of doing so.
  • FIG. 1 is a diagram illustrating an example of a network configuration to which the present invention can be applied.
  • the small cells eg, small cell clusters 101
  • the macro cell 102 provided by the first base station 110 and the second base stations 132, 134, and 136 are provided. It may have the same carrier frequency (F1).
  • the first base station 110 providing the macro cell and the second base station 132, 134, 136 providing each small cell are connected via non-ideal backhaul. Small cells are built in an overlapped macro cell 102 network. An outdoor small cell environment and the small cell cluster 101 may be considered.
  • the UE may be provided with a plurality of serving cells by configuring a dual connection with the macro cell and the small cell in the small cell cluster 101.
  • dual communication with the first base station 110 and the second base station 132, 134, 136 may be performed.
  • FIG. 2 is a diagram illustrating another example of a network configuration to which the present invention can be applied.
  • the macro cell 202 and the small cells 201 may have different carrier frequencies F1 and F2.
  • the first base station 210 providing the macro cell and the second base station 232, 234, 236 providing each small cell are connected through a non-ideal backhaul. Small cells are built in an overlapped macro cell 202 network. An outdoor small cell environment and a small cell cluster 201 may be considered.
  • the UE may be provided with a plurality of serving cells through a dual connection with the macro cell and the small cell in the small cell cluster 201.
  • the frequency of each serving cell may be different from F1 and F2 as shown in FIG. 2.
  • FIG. 3 is a diagram illustrating another example of a network configuration to which the present invention can be applied.
  • a case in which a plurality of small cells forms a small cell cluster 301 may be considered.
  • the base stations 310, 312, and 314 providing the small cells are connected through non-ideal backhaul.
  • Indoor small cell environment and small cell cluster 301 are considered.
  • any one of a plurality of base stations providing a small cell may be the first base station, and the remaining base stations other than the first base station may be the second base station.
  • the terminal may configure a dual connection with the first base station and the second base station to transmit and receive data through a plurality of serving cells.
  • the terminal may transmit user plane data through one or more second base stations under control of the first base station.
  • the user plane data may be transmitted through cooperation between the first base station and one or more second base stations.
  • the user plane data may be transmitted through cooperation between the first base station and the second base station.
  • the terminal establishes one RRC connection with the first base station for control plane data transmission, and configures one or more Data Radio Bearers (DRBs) with the first base station and the second base station. can do.
  • the UE which has established an RRC connection with the first base station, may configure additional radio resources in the second base station connected with non-ideal backhaul.
  • the terminal may establish one RRC connection with the first base station for control plane data transmission and configure one or more DRBs only through the first base station. And / or configure one or more DRBs through the second base station only.
  • FIG. 4 is a diagram exemplarily illustrating operations of a terminal and a base station additionally configuring radio resources of a second base station according to an embodiment of the present invention.
  • the first base station 402 transmits a message for controlling the measurement of the terminal 401 (S410).
  • the terminal 401 performs the measurement based on the measurement control information received from the first base station 402. That is, the terminal 401 measures the channel quality of the cell associated with the second base station, the channel quality of the cell associated with the first base station, and the like based on the measurement control information.
  • the terminal 401 transmits a measurement report including the measured result information to the first base station 402 (S420).
  • the measurement report may be transmitted at a specific time point based on the measurement control information, or may be transmitted periodically.
  • the first base station 402 receives the measurement report from the terminal 401 and determines whether the terminal 401 is offloaded (S430). For example, it determines whether the terminal is offloading based on a predetermined criterion by combining information such as channel quality included in the data request and measurement report of the terminal 401.
  • the first base station 402 determines the offloading of some of the data processing of the terminal 401
  • the first base station 402 transmits an offload request message to the second base station 403 (S440).
  • the above-mentioned message name is referred to for convenience of description in configuring additional radio resources through the second base station, and the name is not limited thereto.
  • the second base station 403 is a base station capable of providing some additional radio resources to the terminal 401 to perform some of the data processing of the terminal, and may be determined by the first base station 402 based on the measurement report.
  • the second base station 403 receives the offload request from the first base station 402 to determine whether to approve (S450).
  • the second base station 403 determines to approve the offloading request of the first base station 402, it transmits a response to the offload request to the first base station 402 (S460).
  • the first base station 402 receives the grant information of the second base station 403 and transmits higher layer signaling including information for configuring additional radio resources of the second base station to the terminal 401 (S470).
  • Higher layer signaling may be an RRC connection reconfiguration message.
  • the terminal 401 further configures radio resources of the second base station based on the higher layer signaling received from the first base station 402 and transmits higher layer signaling including the second base station addition completion information (S480).
  • the higher layer signaling transmitted by the terminal 401 to the first base station 402 may be, for example, an RRC connection reconfiguration complete message.
  • the terminal may further configure radio resources of the second base station by receiving a message including additional radio resource configuration information from the first base station. As a result, the terminal may configure a dual connection with the first base station and the second base station.
  • each step numbers are provided for ease of understanding. However, the number of each step is for convenience of description and may be performed in one process, and one step may be performed separately in two or more steps.
  • First embodiment Procedure and method for the terminal to configure additional radio resources.
  • the first base station configures a UE measurement procedure.
  • the terminal is triggered to send a measurement report (measurement report) by the rule set.
  • the first base station determines offloading of the terminal based on a measurement report and radio resource management (RRM) information.
  • RRM radio resource management
  • the first base station determines to transmit user plane data through the first base station through the first base station and the second base station, or to transmit user plane data through the first base station through the second base station. do.
  • the first base station determines to transmit the specific DRB (s) through the first base station using radio resources of the first base station and the second base station, or transmits the specific DRB (s) using the radio resources of the first base station to the second base station. It is decided to transmit using radio resources of the base station.
  • the first base station transmits a message (offload request message) for preparing the additional radio resource configuration to the second base station.
  • the additional radio resource configuration indicates configuration by adding radio resources of the second base station to the terminal or changing radio resources of the second base station (release and add radio resources of the second base station).
  • the message for preparing additional radio resource configuration includes information (eg, AS-configuration, E-RAB context) required for preparing the additional radio resource configuration at the second base station.
  • information eg, AS-configuration, E-RAB context
  • the first base station transmits a message for preparing the above-described additional radio resource configuration, and may cancel the request for additional radio resource configuration when a certain period of time passes.
  • the first base station when the first base station sends a message (offload request message) for preparing additional radio resource configuration to the second base station, the first base station starts an additional radio resource configuration preparation timer.
  • the additional radio resource configuration preparation timer indicates a timer for specifying and / or limiting a maximum time for processing a message (offload request message) procedure for preparing an additional radio resource configuration.
  • the first base station does not receive an acknowledgment message (offload request response (ACK) message) for a message for preparing additional radio resource configuration before the additional radio resource configuration ready timer expires, the additional radio resource in progress to the second base station.
  • ACK acknowledgment request response
  • a message can be sent to cancel configuration preparation.
  • Admission to offload may be controlled by the second base station (Admission Control).
  • the second base station may not determine whether to approve the E-RAB (s) having the offloading determined by the first base station based on the E-RAB QoS profile.
  • the second base station prepares the L1 / L2 additional radio resource configuration.
  • the L1 / L2 entity is set or prepared for the accepted E-RAB (s) or the offloading requested E-RAB (s).
  • the second base station sends a message (offload request response (ACK) message) to the first base station for confirmation of the additional radio resource configuration.
  • the message for confirming the additional radio resource configuration is, for example, an offload request response message or a concept including an offload request ACK message.
  • the message for confirming the additional radio resource configuration may include information necessary for generating an RRC message for configuring an additional radio resource of the second base station to be transmitted to the terminal by the first base station.
  • the aforementioned message name is also referred to for convenience of description in configuring additional radio resources through the second base station, and the name is not limited thereto.
  • the above-described message for confirming the additional radio resource configuration may include an RRC message for configuring an additional radio resource of the second base station to be transmitted to the terminal by the first base station by the RRC layer of the second base station.
  • the message for confirming the additional radio resource configuration may include a dedicated RACH preamble and other necessary parameters (eg, SIBs, etc.) if necessary.
  • the second base station may cancel preparation for configuring additional radio resources.
  • the second base station may start the additional radio resource configuration timer of the second base station after transmitting a message for confirming the additional radio resource configuration to the first base station.
  • the additional radio resource configuration timer of the second base station indicates a timer for specifying / limiting a maximum time for processing the additional radio resource configuration procedure in the second base station.
  • the additional radio resource configuration timer of the second base station may be stopped when the additional radio resource configuration of the second base station is successfully completed.
  • the second base station may cancel the preparation of the additional radio resource configuration in progress.
  • the first base station receives a success message (eg, RRC Connection Reconfiguration Complete) for the additional radio resource configuration of the second base station from the terminal, the first base station sends a success message for the additional radio resource configuration to the second base station. send.
  • a success message eg, RRC Connection Reconfiguration Complete
  • the first base station does not receive a success message (eg, RRC Connection Reconfiguration Complete) for the additional radio resource configuration of the second base station from the terminal or fail message (eg, RRC Connection reestablish request or additional radio resource configuration failed Upon receipt of an RRC message containing an indication), the first base station sends a failure message (or cancellation message) for additional radio resource configuration to the second base station.
  • a success message eg, RRC Connection Reconfiguration Complete
  • fail message eg, RRC Connection reestablish request or additional radio resource configuration failed
  • the second base station may use the additional radio resource configuration timer of the first base station described below without separately configuring the additional radio resource configuration timer of the second base station described above. For example, if the first base station does not receive a confirmation message (eg, RRC Connection Reconfiguration Complete) indicating that the additional base station has succeeded in configuring the additional radio resource before the additional base station configuration timer of the first base station expires, The base station may send a message (offload cancel message) to cancel the preparation of the additional radio resource configuration in progress.
  • a confirmation message eg, RRC Connection Reconfiguration Complete
  • the confirmation message for the additional radio resource configuration request transmitted by the second base station to the first base station may include an RRC message for allowing the terminal to configure the additional radio resource.
  • the second base station may generate and include the aforementioned RRC message by the RRC layer of the second base station.
  • the second base station may generate an (additional support) RRC entity for the terminal.
  • the second base station when the second base station generates and transmits the above-described RRC message by the RRC layer of the second base station, the second base station may not generate an RRC entity for the terminal.
  • the second base station when the second base station generates an RRC message (or additional radio resource configuration information) for configuring an additional radio resource of the second base station, after generating an RRC entity, a success message for configuring an additional radio resource from the first base station or If a failure (or cancellation) message for additional radio resource configuration is received, it can be removed.
  • the first base station receiving the message for confirming the additional radio resource configuration from the second base station stops the aforementioned additional radio resource configuration preparation timer. And the first base station starts an additional radio resource configuration timer of the first base station.
  • the above-described additional radio resource configuration timer of the first base station may be started after the first base station transmits an RRC connection reconfiguration message to the terminal.
  • the additional radio resource configuration timer of the first base station indicates a timer that specifies / limits a maximum time for processing an additional radio resource configuration procedure (eg, RRC connection reconfiguration) in the first base station.
  • a message for canceling preparation for further radio resource configuration in progress to the second base station (offload cancel message) ) Can be sent.
  • communication with the terminal is performed by using a radio resource configuration through the previous first base station.
  • the first base station does not receive a success message (eg, RRC Connection Reconfiguration Complete) for additional radio resource configuration of the second base station from the terminal, or fails to deliver the success message received from the terminal to the second base station.
  • a success message eg, RRC Connection Reconfiguration Complete
  • the second base station fails to prepare an additional radio resource configuration message (offload failure message). Is sent to the first base station.
  • the additional radio resource configuration preparation failure message may include cause information (Cause IE) having an appropriate value.
  • the first base station receives a response (offload request response (ACK) message) in response to a message (offload request message) for preparing additional radio resource configuration. If not, the first base station may transmit a message (offload cancel message) with an appropriate value for the cause information (Cause IE) to cancel the ongoing radio resource configuration preparation to the second base station.
  • ACK offload request response
  • the first base station may transmit a message (offload cancel message) with an appropriate value for the cause information (Cause IE) to cancel the ongoing radio resource configuration preparation to the second base station.
  • the first base station determines a message for preparing additional radio resource configuration (off). Load request message) procedure can be cancelled.
  • the first base station and / or the second base station may transmit a message to the terminal for configuring additional radio resources, respectively, and may cancel the procedure by operating an associated timer.
  • the first base station may buffer the data packet.
  • a radio bearer configured to not bearer separation
  • a radio bearer (DRB) configured to use a first base station radio resource or transmit user data through the first base station uses a second base station radio resource.
  • DRB radio bearer
  • the first base station may buffer the data packet during the following period so that there is no drop in the data transmitted to the terminal.
  • the first base station buffers the data packet, for example, after receiving a message for confirmation of additional radio resource configuration from the second base station or transmitting an RRC connection reconfiguration message to the terminal, the RRC connection reconfiguration from the terminal.
  • the data packet can be buffered until the completion message is received.
  • the first base station may continue to transmit data to the terminal using the first base station radio resources instead of buffering the data packet during the above period.
  • the first base station sends a sequence number status transfer (SN STATUS TRANSFER) to the second base station to preserve the PDCP state, uplink PDCP SN receiver state and downlink PDCP SN transmitter for the corresponding radio bearers (E-RABs). Can pass status
  • the data of the first base station may be transferred to the second base station.
  • the first base station can continue to transmit data using the first base station radio resource.
  • a radio bearer configured to transmit user data through a first base station (to use a first base station radio resource) may be configured through a first base station and a second base station (a first base station radio resource and a first base station). 2, if the user data is to be transmitted using the base station radio resources, the data transmission can continue through the first base station for the above period.
  • DRB radio bearer
  • the corresponding data packet may be buffered for the above period.
  • the first base station transmits an RRC connection reconfiguration message to the terminal.
  • the described RRC connection reconfiguration message may include information for indicating that the message is for configuring additional radio resources of the second base station.
  • the terminal may start a timer for limiting the additional radio resource configuration time of the terminal.
  • the timer for limiting the additional radio resource configuration time of the terminal is different from the timer included in the information for configuring additional radio resources in the second base station included in the RRC connection reconfiguration message (for example, T304 timer or T304 timer). ARRCtimer).
  • the aforementioned timer value may be a value preset and configured in the terminal.
  • the terminal may stop the timer for limiting the additional radio resource configuration time of the terminal.
  • the successful completion of the additional radio resource configuration of the terminal when at least one or more of the transmission of the RRC connection reconfiguration complete message, MAC successfully uplink synchronization, successfully completing the random access process with the second base station is completed Can be.
  • the terminal may return to the radio resource configuration (configuration before receiving the RRC Connection Reconfiguration message) originally used by the first base station.
  • the information on the radio resource configuration included in the above-described RRC Connection Reconfiguration message may be transmitted to the second base station using a radio bearer configured to transmit user data through the first base station (to use the first base station radio resource).
  • a radio bearer configured through a previous first base station (to use a first base station radio resource) if it includes radio bearer addition modification information for configuring to transmit user data via (using a second base station radio resource) (DRB) configuration can be used to resume data transmission.
  • a radio bearer having information for radio resource configuration included in the above-described RRC Connection Reconfiguration message configured to transmit user data through the first base station (to use the first base station radio resource). If it contains radio bearer modification information for configuring to transmit user data (using the first base station radio resource and the second base station radio resource) through the previous first base station (first base station radio resource) Data transmission may be resumed using the configured radio bearer (DRB) configuration.
  • DRB radio bearer
  • the additional radio resource configuration failure information may be stored in the new information element for VarRLF-Report or the second base station additional radio resource configuration failure report, or the indication information about the second base station additional radio resource configuration failure may be sent to the first base station.
  • the additional radio resource configuration failure information included in the new information element for the aforementioned VarRLF-Report or the second base station additional radio resource configuration failure report or the display information for the second base station additional radio resource configuration failure is described in detail below, for example. do.
  • FIG. 5 is a diagram illustrating an example of additional bearer separated radio resource configuration for additionally configuring radio resources of a second base station according to another embodiment of the present invention.
  • the UE may perform additional radio resource configuration and second base station access procedure together or sequentially.
  • the second base station access procedure represents an access procedure to the second base station PCell.
  • the terminal may perform synchronization with the second base station if necessary and access the second base station through the RACH. That is, the terminal may configure additional radio resources through the second base station before performing synchronization with the second base station and accessing the second base station through the RACH.
  • the terminal may configure additional radio resources through the second base station while performing synchronization with the second base station and accessing the second base station through the RACH.
  • the terminal may configure additional radio resources through the second base station after performing synchronization with the second base station and accessing the second base station through the RACH.
  • a radio bearer that is previously configured to transmit user data through a first base station is to be separated and transmitted by a bearer through a first base station and a second base station, a radio bearer that is part of a current terminal configuration.
  • the RLC entity or entities are reconfigured according to the received rlc-config.
  • the rlc-config may include rlc-config of the terminal RLC entity peered to the first base station RLC entity, and rlc-config of the terminal RLC entity peered to the second base station RLC entity. Specifically, rlc of the terminal RLC entity peered to the received second base station RLC entity by re-establishing the terminal RLC entity peered to the first base station RLC entity and setting the terminal RLC entity peered to the second base station RLC entity. Configure with -config.
  • logicalChannelConfig is included, the logical channel is reconfigured according to the received logicalChannelConfig.
  • the above-described rlc-config and / or logicalChannelConfig may include new information for additional bearer separated radio resource configuration.
  • FIG. 6 is a diagram illustrating an example of additional bearer configuration without bearer separation that additionally configures a radio resource of a second base station according to another embodiment of the present invention.
  • a first base station configures a PDCP entity and an RLC entity and a MAC entity may be configured in the second base station.
  • FIG. 7 is a diagram illustrating another example of configuration of additional radio resources not separated by a bearer for additionally configuring radio resources of a second base station according to another embodiment of the present invention.
  • each of the first base station and the second base station may configure a PDCP entity, an RLC entity, and a MAC entity.
  • each radio bearer may be configured through the first base station or through the second base station without bearer separation for separating the radio bearers through the first base station and the second base station.
  • radio bearer additional modification information (drb- For each DRB identifier (drb-Identity) included in ToAddMod)
  • rlc-config rlc-config of the terminal RLC object peered to the second base station RLC entity
  • the RLC according to the received rlc-config Reconstruct the entity or entities.
  • the terminal RLC entity peered to the first base station is reset with the rlc-config of the terminal RLC entity peered to the received second base station RLC entity.
  • logicalChannelConfig is included, the logical channel is reconfigured according to the received logicalChannelConfig.
  • the aforementioned logicalChannelConfig may include new information for additional bearer separated radio configuration.
  • the terminal may transmit an RRC Connection Reconfiguration Complete message to the first base station.
  • the UE configures additional radio resources through the second base station and sends an RRC Connection Reconfiguration Complete message before performing synchronization with the second base station and accessing the second base station through the RACH. It can transmit to the first base station.
  • the UE while the UE performs synchronization with the second base station and accesses the second base station through the RACH, the UE configures additional radio resources through the second base station and completes RRC connection reconfiguration complete.
  • the message may be sent to the first base station.
  • the terminal may transmit an RRC connection reconfiguration complete message to the first base station. Thereafter, the second base station may be accessed through the RACH.
  • the terminal when the terminal performs downlink synchronization with the second base station and accesses the second base station through the RACH, when additional radio resources are configured in the terminal through the second base station, the terminal may not complete random access with the second base station. Even if it may transmit an RRC Connection Reconfiguration Complete (Connection Reconfiguration Complete) message to the first base station.
  • the UE configures additional radio resources through the second base station and completes the RRC connection reconfiguration complete. ) May be transmitted to at least one base station of the first base station and the second base station.
  • the terminal may add / modify radio resources to the terminal according to the radio bearer additional modification information (drb-ToAddMod) received through the RRC connection reconfiguration message only when the terminal can successfully access the second base station.
  • the second base station radio resource is already configured and the terminal can communicate with the second base station, or the terminal successfully completes the random access process with the second base station.
  • the terminal may add / modify a radio bearer for configuring additional radio resources through the second base station.
  • the terminal When the terminal successfully accesses the second base station, the terminal may transmit an RRC connection reconfiguration complete message to at least one of the first base station and the second base station.
  • a method for transmitting an RRC connection reconfiguration complete message to a first base station by way of example will be described below.
  • the first base station Upon receiving the RRC connection reconfiguration complete message, the first base station sends a success message for additional radio resource configuration to the second base station, and starts sending data to the terminal through the second base station.
  • the UE may generate a random access problem with the second base station in the process of configuring additional radio resources, and thus may not be able to complete additional radio resource configuration. have.
  • the terminal may solve the problem by resuming the existing radio resource configuration using the radio resource of the first base station before setting the additional radio resource configuration of the second base station.
  • FIG. 8 is a diagram exemplarily illustrating operations of a terminal and a base station when additional radio resource configuration fails according to another embodiment of the present invention.
  • a method for configuring a dual connection with a plurality of base stations by a terminal receiving a first signal including information for indicating additional radio resource configuration through the second base station from the first base station And attempting additional radio resource configuration through the second base station and random access with the second base station based on the first signal and failing to configure additional radio resource through the second base station or random access with the second base station. If so, the method may include transmitting a second signal including additional radio resource configuration failure indication information to the first base station.
  • the first base station 802 transmits a first signal including information for indicating additional radio resource configuration through the second base station to the terminal 801 (S810).
  • the first signal may include the RRC connection reconfiguration message described as an example in FIG. 4, and information for indicating an additional radio resource configuration through the second base station and a terminal for configuring the additional radio resource through the second base station. May contain necessary information.
  • the terminal 801 configures additional radio resources based on the received first signal (S820). For example, bearer separation or bearer non-separation radio bearer may be configured based on the first signal. Alternatively, an existing RLC entity may be set as an RLC entity mapped to the first base station based on the first signal, and an RLC entity mapped to the second base station may be configured.
  • the terminal 801 may attempt random access with the second base station 803 before configuring the additional radio resource or during or after configuring the additional radio resource (S830).
  • S830 additional radio resource
  • the terminal 801 attempts random access with the second base station 803 after configuring the additional radio resource, the terminal 801 configures the additional radio resource based on the received first signal (S820).
  • the method may further include sending an RRC connection reconfiguration complete message before step S830 of attempting random access.
  • the terminal 801 configures the additional radio resource based on the received first signal (S820).
  • the terminal 801 configures the additional radio resource based on the received first signal (S820).
  • successfully attempting a random access step (S830) for example, receiving a random access response message, and then sending an RRC connection reconfiguration complete message.
  • the terminal 801 configures the additional radio resource based on the first signal
  • the additional radio resource configuration fails or a failure occurs in the connection with the second base station 803 (S840)
  • the second signal is removed. 1 is transmitted to the base station 802 (S850).
  • the above-described additional radio resource configuration fails or a failure occurs in connection with the second base station 803 (S840)
  • the above-described addition of the terminal is added.
  • the timer for limiting the radio resource configuration time expires.
  • the second signal may include additional radio resource configuration failure indication information of the terminal 801 and may be transmitted through higher layer signaling. For example, it may be included in the RRC connection reconfiguration complete message or may be included in the RRC connection reconfiguration message. In another example, a new RRC message that is not an RRC Connection Reconfiguration Complete message or an RRC Connection Reestablishment message (such as an RRC Connection Reconfiguration Failure message or an RRC Connection Reconfiguration Recovery Request message or an indication of random access attempt failure by additional radio resource configuration) may be included. Message) may be transmitted.
  • the terminal 801 may resume communication with the first base station 802 before receiving the first signal to perform communication (S860).
  • the step S860 may be performed after the step S850 of transmitting the second signal or may be performed before the step S850.
  • the radio resource configuration with the first base station before receiving the first signal may include a data radio bearer over the first base station before receiving the first signal.
  • the terminal 801 fails to complete the above-described additional radio resource configuration, the terminal may resume communication with the first base station 802 before receiving the first signal to perform communication.
  • the radio resource configuration with the first base station before receiving the temporary first signal may be stored.
  • the terminal may further include receiving an RRC connection reconfiguration message including a radio resource configuration with the first base station 802 before receiving the first signal.
  • the method may further include receiving an RRC connection reconfiguration message including radio resource configuration with the first base station 802 before receiving the first signal.
  • the terminal 801 further comprises the step of sending an RRC connection reconfiguration complete message after the step (S820) of configuring the additional radio resources based on the received first signal, before the step (S830) of attempting random access, If a random access with the second base station 803 fails (S840), the terminal transmits a second signal to the first base station 802 (S850).
  • the second signal may include additional radio resource configuration failure indication information (or random access failure indication information for additional radio resource configuration) of the terminal 801 and may be transmitted through higher layer signaling or MAC signaling. For example, it may be included in an RRC connection reconfiguration complete message or an RRC connection reestablishment message.
  • a new RRC message that is not an RRC Connection Reconfiguration Complete message or an RRC Connection Reestablishment message (such as an RRC Connection Reconfiguration Failure message or an RRC Connection Reconfiguration Recovery Request message or an indication of random access attempt failure by additional radio resource configuration) may be included. Message) may be transmitted.
  • it may be transmitted to the first base station through MAC signaling indicating the failure of the random access attempt by the additional radio resource configuration for fast recovery.
  • the terminal 801 may resume communication with the first base station 802 before receiving the first signal and perform communication (S860).
  • the step S860 may be performed after the step S850 of transmitting the second signal or may be performed before the step S850. If step S860 is performed after step S850, the terminal 801 stops the data radio bearer configured in the second base station before transmitting the second signal and receives the first signal after transmitting the second signal.
  • the method may further include at least one of receiving an RRC connection reconfiguration message including a radio resource configuration with the first base station 802. That is, if the above-described additional radio resource configuration fails or the connection with the second base station 803 fails, for example, before the additional radio resource configuration through the second base station is successfully completed.
  • the terminal When the timer for limiting the additional radio resource configuration time of the terminal described above expires, transmission of the data radio bearer configured in the second base station may be stopped and the second signal may be transmitted.
  • the RRC connection reconfiguration message including the radio resource configuration with the first base station 802 before receiving the first signal may be received to resume the data radio bearer configured in the second base station with the radio resource configuration through the first base station.
  • the terminal stores the radio resource configuration with the first base station before receiving the first signal temporarily while the terminal executes a procedure for configuring additional radio resources of the second base station.
  • the terminal stops the data radio bearer configured in the second base station before transmitting the second signal and the radio resource with the first base station 802 after receiving the first signal after transmitting the second signal. It may not include receiving an RRC Connection Reconfiguration message that includes the configuration.
  • the first base station 802 receives a second signal including information on failure to configure additional radio resources from the terminal 801, and transmits an additional radio resource configuration cancellation message to the second base station (S870).
  • the second base station 803 may terminate the additional radio resource configuration procedure for the dual connection configuration with the terminal 801.
  • the first base station transmits a signal including information for configuring additional radio resources through the second base station to the terminal.
  • a step in which the first base station transmits the first signal to the terminal has been described.
  • the RRC connection reconfiguration message is described in detail in step 7).
  • the first signal may be received through higher layer signaling, and may further include additional radio resource configuration indication information through the second base station.
  • the additional radio resource configuration indication information is information for indicating that the corresponding signal is a message for additional radio resource configuration through the second base station.
  • the first signal or the RRC connection reconfiguration message described as an embodiment may include information for additional radio resource configuration through the second base station and additional radio resource configuration indication information.
  • the terminal may recognize that the corresponding message is a signal for additionally configuring radio resources of the second base station based on the additional radio resource configuration indication information.
  • radio resource indication information Detailed embodiments of the radio resource indication information will be described with reference to FIGS. 9 to 14.
  • the additional radio resource indication information which is information for indicating that the message for configuring additional radio resources to the second base station in step 7) and the first signal, may be configured in the following detailed embodiments.
  • First detailed embodiment a method comprising a field for indicating an additional radio resource configuration in a MobilityControlInfo.
  • FIG. 9 is a diagram illustrating an example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • the first signal transmitted from the first base station to the terminal may include additional radio resource configuration indication information indicating that the second base station is a message for configuring additional radio resources.
  • the first signal may be transmitted through higher layer signaling.
  • the first signal may be an RRC connection reconfiguration message.
  • the first signal may be generated by the first base station or generated by the second base station and transmitted through the first base station.
  • the first signal may include a new field in the MobilityControlInfo information element to indicate that the first signal is a message for configuring additional radio resources to the second base station.
  • the SeNBradioresourceconfig field is additionally included in the MobilityControlInfo information element and the corresponding value is set to true, it may indicate that the message is for configuring additional radio resources.
  • Adding a second information base station or secondary cell group to the MobilityControlInfo information element may add an indication information field for indicating a radio resource configuration so that the MobilityControlInfo information element including this field can be distinguished from the conventional MobilityControlInfo information element used for handover. .
  • the MobiilityControlInfo information element including the SeNBradioresourceconfig field provides information on whether the first signal (eg, an RRC connection reconfiguration message) received by the terminal is a signal for further configuring a second base station radio resource.
  • the MobilityControlInfo information element for indicating an additional radio resource configuration in the second base station may include the above timer information and random access configuration information (RACH-ConfigDedicated).
  • the MobilityControlInfo information element may be configured as shown in FIG. 9B. That is, a different name may be used to distinguish it from the conventional MobilityControlInfo information element used for handover.
  • a second base station MobilityControlInfo information element or a secondary cell group MobilityControlInfo information element that is distinguished from the conventional MobilityControlInfo information element may be defined.
  • the second base station MobilityControlInfo information element or secondary cell group MobilityControlInfo information element for indicating an additional radio resource configuration to the second base station may include the above timer information and random access configuration information (RACH-ConfigDedicated).
  • MobilityControlInfo information element may further configure various fields, and may be configured by combining each field of FIGS. 9A and 9B.
  • Second detailed embodiment A method comprising a field for indicating an additional radio resource configuration in SCellToAddMod.
  • FIG. 10 illustrates another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • the aforementioned first signal may include a new field in the SCell information element to indicate that the second base station is a message for configuring additional radio resources.
  • the SeNBradioresourceconfig field and the ARRCtimer field may be added and displayed to the SCellToAddMod-r10 information element.
  • the SeNBradioresourceconfig field may include indication information on whether the first signal is a message for configuring additional radio resources to the second base station. For example, it may be information indicating that a cell having a specific cell index (sCellIndex) included in the SCellToAddMod-r12 information element is a cell associated with the second base station.
  • sCellIndex specific cell index
  • the cell having a specific cell index (sCellIndex) included in the SCellToAddMod-r12 information element by defining a new sCellIndex-12 field that does not include the SeNBradioresourceconfig field and is distinguished from sCellIndex-10 is whether the cell is associated with the first base station. Or it may be identified whether the cell associated with the second base station.
  • the ARRCtimer field includes timer information for configuring additional radio resources of the terminal.
  • the ARRCtimer may be started when the terminal receives a first signal (eg, an RRC Connection Reconfiguration message) including information for configuring additional radio resources through the second base station.
  • a first signal eg, an RRC Connection Reconfiguration message
  • the additional radio resource configuration of the terminal is successfully completed, it may be stopped.
  • the above-mentioned ARRCtimer name is also referred to for convenience of description of a timer for configuring additional radio resources through the second base station, and the name is not limited thereto.
  • the successful completion of the additional radio resource configuration of the terminal if the MAC successfully uplink synchronization, the successful completion of the random access process and the RRC connection reconfiguration complete message (RRC Connection Reconfiguration Complete message) And when it is transmitted.
  • the terminal may return to the radio resource configuration originally used in the first base station.
  • the ARRCtimer may be, for example, a T304 timer or a new timer that is distinct from the T304 timer.
  • the ARRCtimer for configuring additional radio resources described above may not be included in the SCellToAddMod information or may be included in other information elements.
  • the transmission of the data radio bearer configured in the second base station may be stopped and the second signal may be transmitted. And an RRC connection reconfiguration message including radio resource configuration with the first base station 802 before receiving the first signal may be received.
  • the terminal when the additional radio resource configuration through the second base station or random access with the second base station fails, the second base station identification information associated with the failure, the cell associated with the second base station
  • the method may further include storing at least one of identification information and frequency information in a radio link failure report or a second base station additional radio resource configuration failure report.
  • the DRB addition modification information (DRB-ToAddMod) is included in the SCell addition modification information (sCellToAddMod-r12). It may represent an additional radio resource configuration through the second base station.
  • Third detailed embodiment a method comprising a new information element for indicating an additional radio resource configuration.
  • the first signal (for example, an RRC Connection Reconfiguration message) transmitted from the first base station to the terminal may include a new information element distinguished from the existing information element to indicate to the second base station that the message is for configuring additional radio resources. Can be.
  • the information or the first signal included in the first signal may be generated by the first base station, or may be generated by the second base station and transmitted to the terminal through the first base station.
  • FIG. 11 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • the SeNBradioresourceConfig information element may include physical cell identifier information, carrier frequency information, carrier frequency band information, etc. of the target base station (second base station).
  • FIG. 1 Another example of the new information element configuration described above is shown in FIG. 1
  • FIG. 12 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • the SeNBIndex field may include second base station ID or index information for additional radio resource configuration.
  • the field may include a SeNBScellIndex field
  • the SeNBScellindex field may include cell ID information or cell index information of a cell associated with a second base station for additional radio resource configuration.
  • SeNBScellIndex information may be information indicating that a cell having a specific second base station cell index (SeNBScellIndex) is a cell associated with a second base station.
  • the second base station cell index (SeNBScellIndex) may be a value distinguished from the ScellIndex before release-11 for distinguishing a cell associated with the first base station.
  • a new sCellIndex-12 field that does not include the SeNBIndex field or SeNBScellIndex field and is distinguished from sCellIndex-10 so that a cell with a specific cell index (sCellIndex) included in the SCellToAddMod-r12 information element is associated with the first base station. Whether it is a cell or a cell associated with a second base station can be distinguished.
  • the rach-ConfigDedicated information element may include display information for configuring additional radio resources.
  • the ARRCtimer for configuring additional radio resources described above may not be included in the SCellToAddMod information or may be included in other information elements.
  • FIG. 13 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • it may include information for configuring additional radio resources for some cells of a plurality of cells associated with a second base station.
  • radio resource configuration information related to a cell of a second base station to be added may be delivered by including a radioResourceConfigCommonSCell field.
  • the terminal may receive the first signal including the new information element described above, perform a random access process on the second base station, and acquire system information after configuring additional radio resources.
  • the UE may not acquire the system information broadcast by receiving the system information (RadioResourceConfigCommonSCell-r10) included in the common radio resource configuration (radioResourceConfigCommon) through the RRC message.
  • Fourth specific embodiment a method comprising a new field for indicating an additional radio resource configuration in a radioResourceConfigDedicated information element.
  • FIG. 14 is a diagram illustrating another example of additional radio resource configuration indication information that may be included in a first signal according to another embodiment of the present invention.
  • a first signal (for example, an RRC Connection Reconfiguration message) sent from a first base station to a user equipment is a radioResourceConfigDedicated information element to indicate that the second base station is a message for configuring additional radio resources. It may contain new fields.
  • the terminal may recognize that the first signal is a message for additional radio resource configuration. have.
  • the SeNBIndex field may include second base station index information or ID information or identifier information or identifier (True or false) information for additional radio resources of the second base station. That is, when the SeNBIndex field is included, it may indicate that the data radio bearer included in the DRB-ToAddMod is a radio bearer configured through the second base station or using radio resources of the second base station.
  • the SeNBSCellindex field may be included to include index information, ID information, or identifier information of a cell for additional configuration in a terminal among a plurality of cells associated with the second base station.
  • additional radio resource configuration indication information or the information for the additional radio resource configuration that may be included in the first signal have been described above by way of example.
  • Each of the detailed embodiments described above is exemplarily described, and may include various methods including information for indicating additional radio resource configuration and / or information for additional radio resource configuration.
  • the terminal may start a timer for limiting additional radio resource configuration time of the terminal.
  • the timer for limiting the additional radio resource configuration time may be a timer (eg, T304 timer or ARRCtimer) included in the information for configuring additional radio resource in the second base station of the first signal.
  • the timer value may be a value preset and configured in the terminal.
  • the terminal When the terminal performs the additional radio resource configuration based on the received first signal, and successfully performs the additional radio resource configuration and the random access success, the above-described timer is terminated and the terminal is configured to radio resources of the first base station and the second base station. To communicate.
  • the terminal may determine that the additional radio resource configuration has failed and resume the radio resource configuration before receiving the first signal.
  • the radio resource configuration before receiving the first signal may be reset / reconfigured to perform communication using the radio resource of the existing first base station. As a result, the terminal can reduce unnecessary operations due to additional radio resource configuration failure and continuously perform communication.
  • the UE transmits an RRC connection reconfiguration complete message, the MAC entity of the UE successfully synchronizes uplink with the second base station, or the random access process with the second base station is completed successfully.
  • the terminal may return to the last radio resource configuration before receiving the first signal including additional radio resource configuration information through the second base station.
  • the terminal proceeds with the configuration based on the information for additional radio resource configuration. If the procedure to transmit through the second base station fails, the terminal may reconfigure the radio bearer configuration previously configured through the first base station for each corresponding radio bearer.
  • the additional radio resource configuration failure information may be stored in a new information element for VarRLF-Report or a second base station additional radio resource configuration failure report.
  • the second signal including the indication information about the failure of configuring the second base station additional radio resource may be transmitted to the first base station.
  • Additional radio resource configuration failure information included in the new information element for the aforementioned VarRLF-Report or the second base station additional radio resource configuration failure report is as follows.
  • 15 is a diagram illustrating an example of additional radio resource configuration failure information according to another embodiment of the present invention.
  • a new information element for VarRLF-Report or second base station additional radio resource configuration failure report is provided through a field (failedSeNBId or failedSCellId) for identifying a second base station or a second base station that failed to configure additional radio resource.
  • Cell information associated with a second base station or a second base station that fails to configure additional radio resources may be provided.
  • the field for identifying the second base station or the second base station is a secondary cell (SCell) of the second base station or the second base station that failed to configure the second base station additional radio resource, if available, or a cell associated with the second base station. Or sets a global cell identifier of the representative cell of the second base station and, if not, a physical cell identity and a carrier frequency.
  • the field for identifying the second base station or the SCell of the second base station may include a second base station identifier that fails to configure additional radio resources or an SCell identifier of the second base station.
  • the new information element for the VarRLF-Report or the Second Base Station Additional Radio Resource Configuration Failure Report transmits a first signal (eg, an RRC Connection Reconfiguration message) containing the second base station additional radio resource configuration information before configuring the additional radio resource.
  • a first signal eg, an RRC Connection Reconfiguration message
  • a field for identifying the first base station PCell or the first base station may be provided together.
  • the above-mentioned field identifying the PCell or the first base station sets the global cell identifier of the PCell or the first base station or the first base station cell or the representative cell of the first base station.
  • the field identifying the PCell or the first base station may include the first base station identifier.
  • the new information element for VarRLF-Report or Secondary Base Station Additional Radio Resource Configuration Failure Report reports the elapsed time since receiving the last first signal (eg, an RRC Connection Reconfiguration message) containing additional radio resource configuration information via the timeConnFailure field. You can set it.
  • the new information element for VarRLF-Report or Second Base Station Additional Radio Resource Configuration Failure Report may set an additional radio resource configuration failure type or cause value through the connectionFailureType field.
  • 16 is a flowchart illustrating an embodiment of an operation of a terminal according to another embodiment of the present invention.
  • a method for configuring a dual connection with a plurality of base stations by a terminal receiving a first signal including information for indicating additional radio resource configuration through the second base station from the first base station And attempting additional radio resource configuration through the second base station and random access with the second base station based on the first signal and failing to configure additional radio resource through the second base station or random access with the second base station. If so, the method may include transmitting a second signal including additional radio resource configuration failure indication information to the first base station.
  • the terminal receives a first signal including information for configuring additional radio resources through the second base station from the first base station (S1610).
  • the first signal may be transmitted through higher layer signaling, and may further include additional radio resource configuration indication information.
  • the terminal performs a procedure for configuring additional radio resources through the second base station based on the first signal, and attempts random access with the second base station (S1620).
  • the terminal indicates that the additional radio resource configuration has failed to the first base station.
  • the second signal including the display information may be transmitted.
  • the timer for limiting the additional radio resource configuration time of the aforementioned terminal expires and thus, for the VarRLF-Report or the second base station additional radio resource configuration failure report. If the new information element is set, the terminal transmits a second signal to the first base station (S1630).
  • the terminal In order to return to the radio resource configuration with the first base station before receiving the first signal, the terminal performs a corresponding operation and resumes radio resource configuration through the first base station (S1640).
  • resuming the radio resource configuration through the first base station means canceling the bearer configuration for configuring the second base station additional radio resource and returning to the radio bearer configuration through the first base station before receiving the first signal. Means that.
  • 17 is another flowchart illustrating another embodiment of an operation of a terminal according to another embodiment of the present invention.
  • FIG. 17 is a flowchart illustrating an operation of a terminal including storing failure related information when a terminal described with reference to FIG. 15 fails to configure additional radio resources through a second base station.
  • the terminal receives a first signal including information for additional radio resource configuration and / or additional radio resource configuration indication information from the first base station (S1710).
  • the terminal performs additional radio resource configuration through the second base station based on the first signal, and performs a random access procedure with the second base station.
  • the additional radio resource configuration and the random access procedure may be performed at the same time, or any one of them may be sequentially performed sequentially.
  • the terminal may start a timer for configuring additional radio resources while performing additional radio resource configuration. If, before the successful completion of the additional radio resource configuration through the second base station, the timer expires, the UE provides the failure-related information for the VarRLF-Report or the second base station additional radio resource configuration failure report as described in FIG. Can be stored in a new information element.
  • the terminal transmits an additional radio resource configuration complete message (eg, an RRC Connection Reconfiguration Complete message), the MAC successfully uplinks the synchronization with the second base station, or the random access process successfully with the second base station.
  • an additional radio resource configuration complete message eg, an RRC Connection Reconfiguration Complete message
  • the MAC successfully uplinks the synchronization with the second base station, or the random access process successfully with the second base station.
  • the terminal determines that additional radio resource configuration has failed.
  • the terminal may add a new information element or a second base station additional radio for the VarRLF-Report or the second base station additional radio resource configuration failure report described above in the second signal (for example, an RRC Connection Reconfiguration Complete message). It transmits to the first base station including the information indicating that the resource configuration failed (S1740).
  • the timer for limiting the additional radio resource configuration time of the aforementioned terminal expires, thereby configuring the aforementioned VarRLF-Report or the second base station additional radio resource configuration.
  • the second signal may be sent to the first base station when a new information element for the failure report is set.
  • the terminal resumes by reconfiguring / resetting the radio resource configuration through the first base station before the first signal is received (S1750). That is, if the timer of the terminal expires before the additional radio resource configuration through the second base station is successfully completed, the terminal transmits an indication or failure indication that the second base station additional radio resource configuration failure information is available to the second signal. It is possible to allow the first base station to return to the radio resource configuration previously used in the first base station.
  • An indication that the second BS additional radio resource configuration failure information, which may be included in the aforementioned second signal (eg, RRC connection reconfiguration complete message), is available, may use an existing rlf-InfoAvailable field (eg, ENUMERATED ⁇ true ⁇ ). Can be.
  • the existing rlf-InfoAvailable field may be extended and used (ENUMERATED ⁇ cause1, cause2 ⁇ ).
  • a new field may be defined and used that additional radio resource configuration failure information is available.
  • arrcf-InfoAvailable additional radio resource configuration failure-infoAvailable (true) may be defined.
  • the second signal is randomized by a radio resource connection reconfiguration failure message or an RRC connection reconfiguration recovery request message or an additional radio resource configuration, which is different from a radio resource connection reconfiguration complete message and a radio resource connection reestablishment message.
  • the additional radio resource configuration failure indication information or the RRC connection reconfiguration recovery request information or the random access attempt failure indication information by the additional radio resource configuration may be included in the message including the access attempt failure indication.
  • the terminal may indicate that the new information element for the aforementioned VarRLF-Report or the second base station additional radio resource configuration failure report or the second base station additional radio resource configuration failure information is available and / or the second base station additional radio.
  • Failure indication information on the resource configuration may be transmitted to the first base station through an RRC message other than the RRC connection reconfiguration complete message.
  • another RRC message may be an RRC Connection Setup Complete message UEInformationResponse or ULInformationTransfer or RRC Connection Re-establishment Complete message or a new RRC message.
  • the conventional RRC connection reconfiguration procedure is considered to be a reconfiguration failure when the UE fails to comply with some of the configurations included in the RRC connection reconfiguration message received from the base station, and if the security is not activated (RRC connection) Performs the operation of leaving RRC_CONNECTED. If security was enabled, the RRC connection re-establish procedure had to be initiated.
  • connection failure to the second base station for example, a problem on the second base station random access or a downlink of the second base station serving cell to configure additional radio resources
  • RRC connection as in the conventional method when the second base station additional radio resource configuration failure occurs due to a failure in synchronizing with the UE or N310 consecutive out-of-sync indications in the physical layer of the second base station serving cell.
  • Handling as a reconfiguration failure can be inefficient.
  • the terminal according to the present invention includes failure indication information (or RRC connection reconfiguration recovery request information (or random access attempt failure indication information by the additional radio resource configuration) for the second base station additional radio resource configuration) in the second signal;
  • a new failure message for reporting a failure for the second base station additional radio resource configuration may be defined.
  • the second signal according to the present invention is a radio resource connection reconfiguration complete message or a radio resource connection reconfiguration complete message (RRC Connection Re-establishment message) distinguished from the radio resource connection reconfiguration failure message or RRC connection reconfiguration message
  • the message containing the recovery request message or the random access attempt failure indication by the additional radio resource configuration may include additional radio resource failure indication information or the RRC connection reconfiguration recovery request information or the random access attempt failure indication by the additional radio resource configuration. Can be.
  • the second signal according to the present invention may be provided by MAC signaling indicating an additional radio resource configuration failure (or an RRC connection reconfiguration recovery request or a random access attempt by the additional radio resource configuration) for fast processing.
  • a new RRC failure message for a second base station additional radio resource configuration eg, a message including a radio resource connection reconfiguration failure message or an RRC connection reconfiguration recovery request message or a random access attempt failure indication by the additional radio resource configuration.
  • the terminal may maintain the serving cell (s) of the existing first base station.
  • the terminal may maintain the serving cell (s) of the existing first base station even when executing the RRC connection reconfiguration procedure due to the failure of the second base station additional radio resource configuration.
  • the second base station additional radio resource configuration failure indication may be included in reestablishmentCause information of the RRC connection re-establish request message.
  • the first base station may release the preparation for the second base station additional radio resource configuration in progress in the first base station.
  • the first base station may send a message (offload cancel message) for canceling the preparation of further radio resource configuration in progress to the second base station.
  • the terminal may succeed in configuring additional radio resources and random access with the second base station based on the first signal.
  • the terminal may transmit information on the success of additional radio resource configuration to the first base station or the second base station.
  • First embodiment A method of transmitting an RRC connection reconfiguration complete message to a first base station.
  • the terminal may transmit an RRC Connection Reconfiguration Complete message to the first base station.
  • RRC Connection Reconfiguration Complete may be transmitted without distinguishing a base station uplink transmission channel.
  • SRB Signaling Radio Bearer
  • a signaling radio bearer (SRB) for transmitting an RRC message is configured to be transmitted only through a first base station as illustrated in FIG. 6, the terminal transmits an RRC Connection Reconfiguration Complete on a first uplink transport channel.
  • SRB signaling radio bearer
  • the terminal may transmit an RRC Connection Reconfiguration Complete message to a first base station uplink transmission channel configured with the SRB.
  • the first base station can forward it to the second base station.
  • the first base station receiving the RRC Connection Reconfiguration Complete message may transmit a success message for additional radio resource configuration to the second base station.
  • an RRC Connection Reconfiguration Complete message is transmitted through a second base station transport channel of the terminal.
  • the second base station may check the RRC Connection Reconfiguration Complete message forwarded to the first base station.
  • the second base station may confirm the additional radio resource success through a random access procedure.
  • Second embodiment A method of transmitting an RRC Connection Reconfiguration Complete message to a second base station.
  • the terminal may transmit an RRC Connection Reconfiguration Complete message to the second base station.
  • SRB Signaling Radio Bearer
  • the terminal transmits an RRC Connection Reconfiguration Complete on a logical channel upstream of the second base station.
  • SRB signaling radio bearer
  • the terminal may transmit an RRC Connection Reconfiguration Complete message through a second uplink transmission channel.
  • SRB signaling radio bearer
  • the second base station may forward it to the first base station.
  • Third embodiment A method of transmitting an RRC Connection Reconfiguration Complete message to a first base station and a second base station, respectively.
  • the UE may transmit an RRC Connection Reconfiguration Complete message to the first base station and the second base station.
  • the aforementioned first signal (eg, an RRC Connection Reconfiguration message) may include information for allowing the UE to transmit an RRC Connection Reconfiguration Complete message to each of the first base station and the second base station.
  • the first signal (eg, an RRC Connection Reconfiguration message) includes information for allowing the UE to transmit an RRC Connection Reconfiguration Complete message to each of the first base station and the second base station, or information indicating additional radio resource configuration to the second base station. If is included, the UE can transmit the RRC Connection Reconfiguration Complete through the first base station uplink transport channel and the second base station uplink transport channel, respectively.
  • the first base station or the second base station may forward the received RRC Connection Reconfiguration Complete message to the second base station or the first base station.
  • FIG. 18 is a flowchart illustrating an embodiment of an operation of a base station according to another embodiment of the present invention.
  • a method for controlling a dual connectivity configuration of a terminal by a first base station comprising: receiving a first signal including information for indicating an additional radio resource configuration through a second base station;
  • the method may include transmitting through layer signaling and receiving a second signal including additional radio resource configuration failure indication information from the terminal.
  • the base station receives a first signal including information necessary for the terminal to additionally configure radio resources of the second base station (S1810).
  • the first signal is transmitted through higher layer signaling and may further include additional radio resource configuration indication information through the second base station.
  • additional radio resource configuration indication information have been described in detail with reference to FIGS. 9 through 14.
  • the first base station transmits the generated first signal to the terminal through higher layer signaling (S1820).
  • the terminal performs additional radio resource configuration through the second base station based on the first signal and performs a random access procedure with the second base station. If the terminal successfully completes the additional radio resource configuration through the second base station and the random access procedure with the second base station, the first base station may receive a message including additional radio resource configuration completion information from the terminal. Various detailed embodiments in which the first base station receives additional radio resource configuration completion information have been described above.
  • the first base station may receive a second signal from the terminal (S1830). ).
  • the second signal includes a radio resource connection reconfiguration failure message (or an RRC connection reconfiguration recovery request message or a random access attempt failure indication by additional radio resource configuration) that is different from the radio resource connection reconfiguration complete message and the radio resource connection reset message.
  • the new message may include additional radio resource configuration failure indication information (or RRC connection reconfiguration recovery request information or random access attempt failure indication information by additional radio resource configuration).
  • the second signal may be transmitted through MAC signaling indicating an additional radio resource configuration failure (or random access failure for additional radio resource configuration) of the terminal.
  • the first base station may resume the radio resource configuration with the terminal before transmitting the first signal (S1840).
  • the first base station transmits a first signal for configuring a radio bearer using a radio resource of the second base station as shown in FIGS. 5 to 7, but if the terminal fails to configure additional radio resources, the radio of the second base station The previous configuration of the radio bearer using the resource can be resumed to perform communication with the terminal.
  • the first base station may transmit an RRC connection reconfiguration message including the configuration information before the radio bearer configuration using the radio resources of the second base station to the terminal.
  • 19 is another flowchart illustrating another embodiment of an operation of a base station according to another embodiment of the present invention.
  • the base station may further include transmitting a message for canceling additional radio resource configuration to the second base station after receiving the second signal.
  • the first base station generates a first signal including additional radio resource configuration information using radio resources of the second base station (S1910).
  • the first signal may further include additional radio resource configuration indication information and may be transmitted to the terminal through higher layer signaling (S1920).
  • the first base station receives a second signal from the terminal (S1930).
  • the second signal may include additional radio resource configuration failure indication information and may be received through higher layer signaling.
  • the second signal may include a radio resource connection reconfiguration failure message (or an RRC connection reconfiguration recovery request message or random access attempt failure indication information that is distinguished from a radio resource connection reconfiguration complete message and a radio resource connection reset message).
  • the new message may include additional radio resource configuration failure indication information. That is, the second signal may be a newly defined radio resource connection reconfiguration failure message different from the existing message, or may include a corresponding message.
  • the second signal may be transmitted through MAC signaling indicating an additional radio resource configuration failure (or random access failure for additional radio resource configuration) of the terminal.
  • the first base station may transmit a message for canceling the additional radio resource configuration to the second base station (S1940).
  • Step S1940 and resuming the existing radio resource configuration may be performed at the same time, or any one step may be performed prior to the other step.
  • the second base station Upon receiving the message including information for canceling the additional radio resource configuration from the first base station, the second base station cancels all procedures for configuring the additional radio resource with the terminal.
  • the present invention is a radio link failure in the process of configuring additional radio resources that may be provided by the second base station to use radio resources provided by one or more different base stations connected through non-ideal backhaul Even if the additional radio resource configuration is not successful due to such a situation, the terminal and the first base station can resume communication of the existing radio resource configuration. As a result, the UE does not go through unnecessary RRC connection resetting step or SRB release and SCell release step except for SRB0.
  • 20 is a diagram illustrating a configuration of a terminal according to another embodiment of the present invention.
  • the user terminal 2000 includes a receiver 2010, a controller 2020, and a transmitter 2030.
  • the terminal 2000 constituting the dual connection with the plurality of base stations of the present invention includes a receiving unit 2010 for receiving a first signal including information for indicating additional radio resource configuration through the second base station from the first base station;
  • the controller 2020 attempts to configure additional radio resources through the second base station and random access with the second base station based on the first signal, and configures additional radio resources through the second base station or random access with the second base station. If so, it may include a transmitter 2030 for transmitting a second signal including additional radio resource configuration failure indication information to the first base station.
  • the controller 2020 may control to resume the radio resource configuration through the first base station before receiving the first signal.
  • the radio resource configuration through the first base station includes a data radio bearer through the first base station before receiving the first signal as described above.
  • control unit 2020 may include second base station identification information related to the failure, cell identification information and frequency information associated with the second base station. At least one of the information may be controlled to be stored in the radio link failure report or the second base station additional radio resource configuration failure report.
  • the receiver 2010 may receive the first signal through higher layer signaling, and the first signal may further include display information indicating an additional radio resource configuration through the second base station.
  • the transmitter 2030 may transmit a second signal through higher layer signaling, and the second signal may be a radio resource connection reconfiguration failure message or an RRC connection reconfiguration recovery request that is different from a radio resource connection reconfiguration complete message or a radio resource connection reestablishment message.
  • the additional radio resource configuration failure indication information or the RRC connection reconfiguration recovery request or the random access attempt failure indication information due to the additional radio resource configuration may be included in the message or the message including the random access attempt failure indication by the additional radio resource configuration. .
  • the receiver 2010 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • control unit 2020 controls the terminal required to perform the above-described present invention configures additional radio resources, and if it fails, the overall operation of the terminal according to resuming the radio resource configuration with the existing first base station is performed. To control.
  • the transmitter 2030 further transmits uplink control information, data, and messages to the base station through a corresponding channel.
  • 21 is a diagram showing the configuration of a base station according to another embodiment of the present invention.
  • a base station 2100 includes a controller 2110, a transmitter 2120, and a receiver 2130.
  • the transmitter 2120 may transmit a signal through higher layer signaling.
  • the receiver 2130 may receive a second signal including additional radio resource configuration failure indication information from the terminal.
  • the controller 2110 may control to resume radio resource configuration with the terminal before transmitting the first signal.
  • the radio resource configuration with the terminal before transmitting the first signal may include a data radio bearer (DRB) through the first base station before transmitting the first signal.
  • DRB data radio bearer
  • the transmitter 2120 may transmit the first signal through higher layer signaling, and the first signal may further include display information indicating an additional radio resource configuration through the second base station.
  • the transmitter 2120 may further transmit a message for resuming the data radio bearer through the first base station after receiving the second signal but before transmitting the first signal to the terminal, or cancel the additional radio resource configuration to the second base station. You can send a message to do so.
  • the receiver 2130 may receive a second signal including additional radio resource configuration failure information from the terminal, and the second signal may fail to configure a radio resource connection reconfiguration that is different from a radio resource connection reconfiguration complete message or a radio resource connection reconfiguration message. Indication of additional radio resource configuration failure indication (or random access attempt failure due to RRC connection reconfiguration recovery request or additional radio resource configuration) in a message (or RRC connection reconfiguration recovery request message or random access attempt failure due to additional radio resource configuration) Information).
  • controller 2110 configures an additional radio resource in a terminal necessary to perform the above-described present invention, and if it fails, controls the overall operation of the base station according to resuming the existing radio resource configuration.
  • the transmitter 2120 and the receiver 2130 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention.
  • the terminal provides a specific procedure for performing additional radio resource configuration through the second base station.

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

Abstract

La présente invention concerne un procédé de configuration de connexion double avec une pluralité de stations de base par un terminal et, plus précisément, un procédé et un appareil adaptés pour gérer un cas où un terminal ne parvient pas à traiter une configuration de ressource sans fil supplémentaire pour utiliser des ressources sans fil fournies par différentes stations de base. En particulier, la présente invention concerne le procédé de configuration de la connexion double avec la pluralité de stations de base par le terminal, comprenant les étapes consistant à : recevoir, de la première station de base, un premier signal contenant des informations pour indiquer la configuration de la ressource sans fil supplémentaire via la seconde station de base ; tenter la configuration de la ressource sans fil supplémentaire via la seconde station de base et l'accès aléatoire avec la seconde station de base d'après le premier signal ; et transmettre, à la première station de base, un second signal contenant des informations indiquant l'échec de la configuration de la ressource sans fil supplémentaire quand le terminal ne parvient pas à configurer la ressource sans fil supplémentaire via la seconde station de base ou l'accès aléatoire avec la seconde station de base. L'invention concerne également l'appareil correspondant pour exécuter le procédé.
PCT/KR2014/010094 2013-06-13 2014-10-27 Procédé et appareil de configuration de connexion double dans un réseau de communication mobile WO2015064972A1 (fr)

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CN201480058780.3A CN105684491B (zh) 2013-10-30 2014-10-27 用于在移动通信网络中配置双连接的方法及其装置
US15/032,651 US10362615B2 (en) 2013-10-30 2014-10-27 Method and apparatus for configuring dual connection in mobile communication network

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KR10-2013-0130408 2013-10-30
KR1020130130408A KR20140145524A (ko) 2013-06-13 2013-10-30 듀얼 커넥티비티 구성 처리 방법 및 장치
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CN107852653A (zh) * 2015-09-23 2018-03-27 株式会社Kt 用于控制终端的移动性的方法及其装置
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