WO2019013543A1 - Procédé et appareil de commande d'agrégation de porteuses pour un réseau sans fil de prochaine génération - Google Patents

Procédé et appareil de commande d'agrégation de porteuses pour un réseau sans fil de prochaine génération Download PDF

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Publication number
WO2019013543A1
WO2019013543A1 PCT/KR2018/007844 KR2018007844W WO2019013543A1 WO 2019013543 A1 WO2019013543 A1 WO 2019013543A1 KR 2018007844 W KR2018007844 W KR 2018007844W WO 2019013543 A1 WO2019013543 A1 WO 2019013543A1
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Prior art keywords
secondary cell
information
node
terminal
state
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PCT/KR2018/007844
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English (en)
Korean (ko)
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홍성표
최우진
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주식회사 케이티
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Priority claimed from KR1020180079460A external-priority patent/KR20190008114A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Publication of WO2019013543A1 publication Critical patent/WO2019013543A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present disclosure relates to a method and apparatus for controlling carrier merging in a next-generation radio access network or an LTE radio access network that is comprised of a higher layer functional separation structure. And more particularly, to a method and apparatus for determining an activation state of a secondary cell constituted by a carrier combination.
  • Next-generation mobile communication technology is being studied in response to a demand for large-capacity data processing and a demand for high-speed data processing.
  • a mobile communication system such as LTE (Long Term Evolution), LTE-Advanced, and 5G of the current 3GPP series
  • LTE Long Term Evolution
  • LTE-Advanced Long Term Evolution-Advanced
  • 5G the current 3GPP series
  • a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data, .
  • a carrier merging technique In order to handle such a demand, a carrier merging technique has been developed in which a terminal and a base station merge a plurality of carriers to transmit and receive data.
  • next generation radio access network such as 5G
  • 5G next generation radio access network
  • discussions are underway to distribute the functions of the base stations to the logical nodes.
  • the present disclosure proposes a procedure for determining a state change for a secondary cell constituting a carrier merging and instructing the state change to a terminal.
  • the present disclosure also contemplates a specific procedure and protocol for configuring carrier merging and performing an activation state change of the secondary cell.
  • a method of controlling a carrier merging of a terminal comprising: receiving measurement report information on a cell from the terminal; And a convergence node deciding a carrier merging configuration using a cell configured by one or more distributed nodes, and a step of determining a convergence node or a dispersed node based on measurement report information and information on the amount of downlink data received from the core network entity, Comprising: determining a secondary cell state for each of at least one secondary cell configured in a terminal; and transmitting, by the distributed node, information indicating a secondary cell state for a secondary cell to the terminal, An SDAP layer, and a PDCP layer, and the distributed node includes an RLC layer, a MAC Layer and a PHY layer, and the centralized node and one or more distributed nodes provide a method for transmitting and receiving information via the F1 interface.
  • a method of performing carrier merging using a base station including a centralized node and at least one distributed node comprising: transmitting measurement report information to a base station via a distributed node based on cell measurement configuration information; Configuring a carrier merging by setting at least one secondary cell constituting a distributed node to an active state or a deactivated state, and when one or more secondary cells are set to a deactivated state and carrier merging is configured, Receiving information indicating a secondary cell state of each of at least one secondary cell determined by the node using the measurement report information and the information on the amount of downlink data, wherein the concentration node includes an RRC layer, an SDAP layer, and a PDCP layer And the distributed node is a logical node that hosts the RLC layer A MAC layer, and a PHY layer, and the centralized node and one or more distributed nodes provide a method for transmitting and receiving information through the F1 interface.
  • a base station including a centralized node and at least one distributed node for controlling the merging of carriers in a terminal
  • the base station including: a receiver for receiving measurement report information on a cell from the terminal; Determining whether to merge the carriers into the terminal using the cells that constitute the core network, and using the measurement report information and information on the amount of downlink data received from the core network entity, And a transmitting unit for transmitting information indicating a secondary cell state of the secondary cell to the terminal, wherein the centralized node is configured to host the RRC layer, the SDAP layer, and the PDCP layer Logical node, and the distributed node hosts the RLC layer, the MAC layer, and the PHY layer
  • a logical node, focus node and one or more distribution nodes provides a base station apparatus for transmitting and receiving information via the F1 interface.
  • a UE performing carrier merging using a base station configured with one centralized node and one or more distributed nodes transmits measurement report information to a base station via a distributed node based on cell measurement configuration information
  • a control unit that configures a carrier merging by setting at least one secondary cell constituted by a transmitting unit and a distributed node to an active state or a deactivated state, and a centralized node or a distributed node when the at least one secondary cell is set to a deactivated state
  • the distributed node includes a RLC layer, A MAC layer, and a PHY layer, and the centralized node and one or more distributed nodes provide a terminal device that transmits and receives information through the F1 interface.
  • the present disclosure has an effect of providing a procedure by which a base station to which a next-generation radio access network is applied is configured to merge carriers into a terminal and to change the activation state with respect to a configured secondary cell.
  • the present disclosure provides an advantage that a large amount of data can be transmitted / received at a high speed by providing a carrier merging utilizing a next generation radio access network.
  • FIG. 1 is a diagram illustrating a base station and a core network structure in a next generation radio access network.
  • FIG. 2 is a view for explaining the operation of a base station according to an embodiment.
  • FIG. 3 is a view for explaining the operation of a base station according to another embodiment.
  • FIG. 4 is a diagram for explaining operations of a terminal according to an embodiment.
  • FIG. 5 is a diagram exemplifying information indicating a secondary cell state when a subcell index (servcellindex) according to an embodiment is not greater than 7.
  • FIG. 6 is a diagram exemplarily showing information indicating a secondary cell state in a case where a subcell index (servcellindex) 7 according to an embodiment of the present invention is greater than seven.
  • FIG. 7 is a diagram illustrating a configuration of a base station according to an embodiment.
  • FIG. 8 is a diagram illustrating a configuration of a terminal according to an embodiment.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement.
  • the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
  • the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations.
  • the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.
  • a wireless communication system includes a user equipment (UE) and a base station (BS, or eNB).
  • the user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.
  • a base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.
  • eNB evolved Node-B
  • RRH remote radio head
  • RU radio unit
  • the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.
  • BSC Base Station Controller
  • NodeB in WCDMA NodeB in WCDMA
  • eNB in LTE or sector (site)
  • coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.
  • the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration.
  • An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area.
  • ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.
  • a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.
  • the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in the present specification, and are not limited by a specific term or word.
  • the user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word.
  • an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-FDMA
  • An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB.
  • the present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.
  • a TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.
  • a standard is constructed by configuring uplink and downlink based on a single carrier or carrier pair.
  • the uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.
  • PDSCH Physical Downlink Shared CHannel
  • PUSCH Physical Uplink Shared CHannel
  • control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).
  • a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .
  • the wireless communication system to which the embodiments are applied may be a multi-point coordination / reception system (CoMP system) or a coordinated multi-antenna transmission system (CoMP system) in which two or more transmission / reception points cooperatively transmit signals. ), A cooperative multi-cell communication system.
  • a CoMP system may include at least two multipoint transmit and receive points and terminals.
  • the multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >
  • a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal
  • an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point.
  • a transmitter may be a part of a multipoint transmission / reception point
  • a receiver may be a part of a terminal.
  • the transmitter may be a part of the terminal
  • the receiver may be a part of multiple transmission / reception points.
  • a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.
  • an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.
  • the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.
  • EPDCCH which is an embodiment of the present invention
  • EPDCCH may be applied to the portion described with PDCCH
  • EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.
  • the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.
  • the eNB performs downlink transmission to the UEs.
  • the eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PDCCH physical downlink control channel
  • PUSCH Physical Uplink Shared Channel
  • Enhanced Mobile Broadband eMBB
  • massive Machine Type Communication mMTC
  • Ultra Reliable and Low Latency Communication URLLC
  • a frequency, a frame, a subframe, a resource, a resource block, a region, a band, a subband, a control channel, a data channel, a synchronization signal, various reference signals, various signals May be interpreted as past or presently used meanings or various meanings used in the future.
  • LTE and NR in this specification refer to different radio access technologies, and a new radio access technology under discussion in Release-15 of 3GPP will be described as NR.
  • NR may include various differences such as LTE, frame structure, channel, and core network technology, and various functions for wireless transmission, high-speed, and large-capacity data transmission in the high band can be added.
  • the NR is described in terms of the next generation radio access network, 5G, and the like, and LTE can be mixedly used in terms of the conventional radio access network or 4G.
  • the conventional wireless access technology will be described as LTE and the new wireless access technology discussed in 3GPP will be described as NR.
  • the base station may be an eNB using LTE technology, a gNB using NR technology, and separately described according to need.
  • " cell " used herein refers to a wireless path for transmitting data, a wireless link, a carrier, and the like, and one base station can transmit and receive data through a plurality of cells.
  • a terminal can transmit and receive data using a plurality of cells through cells controlled by two base stations.
  • carrier merging when a single base station controls a plurality of cells, it is described as carrier merging, and when a plurality of cells controlled by two or more base stations are used, dual connectivity can be described.
  • each message and signal may include various information as well as information described below.
  • each message or signal may include information elements specified in 3GPP TS 36.331 and 38.331. Therefore, information elements which are unnecessary for explaining the present embodiment or information elements described in 3GPP TS 36.331 and 38.331 and the like can be omitted for the sake of understanding.
  • Carrier merging (CA) technology is a technique for boosting the data rate for a terminal via an additional cell.
  • CA Carrier merging
  • an RRC connection is established in a terminal, a cell serving as a reference for handover is set as a primary cell (PCell), a cell for transmitting / receiving data by additionally allocating a radio resource to the terminal is referred to as a secondary cell Can be set.
  • the secondary cell is configured to be in an inactive state, and then the secondary cell state is determined in consideration of the measurement report information of the terminal.
  • the state of the secondary cell can be distinguished by activation or deactivation, but the setting of the state can also be done except activation and deactivation. That is, the state of the secondary cell is described with reference to a case where it is divided into activation and inactivation, but the present invention is not limited thereto.
  • an additional state is determined according to the state setting of the base station or the terminal, Can be determined.
  • the determination may be performed by the control entity of the base station.
  • the base station of 5G may be distributed to a plurality of logical nodes There is ambiguity in the subject that determines the secondary cell status of the secondary cell and the subject that transmits the information indicating the secondary cell status.
  • the present disclosure proposes an operation of a base station and a terminal in order to perform a smooth carrier merging operation in consideration of the problems and requirements.
  • the base station of the high layer functional split structure is the base station of the high layer functional split structure
  • NR can be provided separately as a central unit (CU) and a distributed node (DU) to support efficient network construction. That is, the base station of the NR is divided into the CU and the DU and can provide the service.
  • the CU and the DU may be configured as a logical node in the same place as a logical node, or may be installed in a spatially separated place and operated through a logical division.
  • a convergence node may refer to a logical node hosting an RRC layer, an SDAP layer, and a PDCP layer.
  • the CU means a logical node hosting the RRC, SDAP and PDCP protocols.
  • the CU means a logical node hosting the RRC and the higher layer L2 protocol (PDCP).
  • the CU controls operations on one or more DUs.
  • the CU terminates the F1 interface associated with DU (the gNB-CU also terminates F1 interface connected with the gNB-DU).
  • the distributed node may mean a logical node that hosts the RLC layer, the MAC layer, and the PHY layer.
  • the operation of DU is partially controlled by the CU.
  • a DU supports one or more cells. One cell is supported by only one DU.
  • DU terminates the F1 interface associated with the CU.
  • FIG. 1 is a diagram illustrating a base station and a core network structure in a next generation radio access network.
  • the NG-RAN means a next-generation radio access network and may be configured as an NR base station (gNB).
  • the NG-RAN can be connected to a 5G core network (5GC).
  • the gNB may be connected to the EPC, which is a 4G core network, if necessary.
  • the NG-RAN consists of one set of base stations (gNBs) that are connected to the 5GC through a NG interface (the NG-RAN consists of a set of gNBs connected to the 5GC through the NG).
  • the base stations can be interconnected via the Xn interface (gNBs can be interconnected through the Xn).
  • each base station can consist of one CU and one or more DUs (A gNB may consist of a gNB-CU and gNB-DUs).
  • the CU and DU are connected via the F1 interface (A gNB-CU and a gNB-DU is connected via F1 logical interface).
  • One DU is connected to only one CU (one gNB-DU is connected to only one gNB-CU).
  • the NG interface and the Xn-C interface for one base station consisting of CU and DU are terminated in the CU (For NG-RAN, the NG and Xn-C interfaces for a GNB consisting of a gNB-CU and gNB-DUS , terminate in the gNB-CU).
  • the S1-U interface and the X2-C interface for one base station consisting of CU and DU for EN-DC are terminated in the CU (For EN-DC, the S1-U and X2-C interfaces for a gNB consisting of a gNB-CU and gNB-DUS, terminate in the gNB-CU).
  • the DU connected to the CU is only visible to other base stations and to the 5GC as one base station (the gNB-CU and connected gNB-DUS are only visible to other gNBs and the 5GC as a gNB). That is, the base station is composed of CU and DU, but it is recognized as a single base station from the outside in terms of logical division within the base station.
  • one DU supports one or more cells.
  • one CU may be connected to one DU that constitutes one or more cells to provide a carrier merger (CA) to the terminal via one or more cells.
  • one CU may be coupled to one or more DUs having one or more cells, respectively, to provide a carrier merger (CA) to the terminal via one or more cells.
  • CA carrier merger
  • an additional cell (ex, secondary cell) must be configured and activated.
  • the base station can determine the configuration of the additional cell by using the measurement report information or the like received from the terminal, and can instruct the terminal to the information for the CA based on the determined contents.
  • the base station can perform status determination (activation / deactivation setting) operation of the additional cell in consideration of the following measurement report received from the terminal, downlink data received from the core network, and the like.
  • the CU when one base station is separated into CU and DU, the CU performs a function of terminating the RRC function including the measurement report and the core network, and a MAC function that DU performs the activation / deactivation instruction for the actual additional cell .
  • a specific protocol for providing various operations of merging carriers between the CU and the DU is required, there is a problem that the CA can not be performed because the procedure or method is not provided. That is, the prior art does not provide a specific procedure for applying a carrier merging technique to a terminal in a radio access network established through upper layer functional separation (separated by a CU and a DU), and thus it is difficult to effectively apply it.
  • the present disclosure provides a signaling and operation method of a CU and a DU for applying a carrier merging technique to a UE in a radio access network constructed through upper layer function separation (separated by CU and DU) I want to.
  • the secondary cell when a CA is configured in a terminal, all secondary cells except for a special cell (for example, PCell or PSCell) capable of transmitting an uplink control signal are configured to be inactivated through RRC signaling, .
  • the secondary cell may be configured to be in the active state at the time of CA configuration.
  • the CU or DU may be activated through the operations of the embodiments described below It is possible to determine whether or not the state is configured. That is, the present disclosure relates to an operation of determining a secondary cell state for a secondary cell when the secondary cell is configured or configured in the terminal.
  • the CU and DU in this specification can be physically co-located in the same place as logical nodes.
  • the CUs and DUs may be located in separate, separate locations, and may be connected through an ideal backhaul between the CU and the DU.
  • the CUs and DUs may be located at separate, separate locations, and may be connected through a non-ideal backhaul between the CU and the DU.
  • FIG. 2 is a view for explaining the operation of a base station according to an embodiment.
  • a BS including one centralized node and one or more distributed nodes may perform a step of receiving measurement report information on a cell from a UE in a method of controlling carrier merging of the UE (S210 ).
  • the terminal may receive measurement configuration information for quality measurement of the cell from the base station in advance.
  • the UE performs a measurement operation on the cell to be measured using the received measurement configuration information, and transmits measurement report information including the measurement result to the base station.
  • the base station receives the measurement report information from the terminal, and the concentration node receives the measurement report information through the distributed node. That is, when a signal is received through the physical layer (PHY Layer) of the distributed node, it is transferred to the upper layer through the operation of each layer and transferred to the centralized node.
  • PHY Layer physical layer
  • the base station can perform the step of determining the configuration of merging the carriers in the terminal using the cells formed by one or more distributed nodes (S220).
  • the convergence node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer
  • the distributed node refers to a logical node that hosts the RLC layer, the MAC layer, and the PHY layer.
  • the centralized node and one or more distributed nodes can send and receive information via the F1 interface.
  • the base station determines whether it is necessary to construct an additional cell in the terminal using the measurement report information received from the terminal. For example, the base station determines whether it is necessary to configure an additional cell in the terminal using the measurement report information and the downlink data information to be transmitted to the terminal. If necessary, the base station may distinguish whether the cell further configured in the terminal is a cell of the same base station or a cell of another base station. Alternatively, the base station may distinguish whether the cell further configured in the terminal is a cell of the same distributed node or a cell of a different distributed node. That is, the base station can identify the distributed nodes constituting the cell in the terminal.
  • the base station can determine whether to merge the carriers by using the additional cells in the terminal. For example, if it is determined that carrier merging is configured in the terminal, the base station can transmit configuration information for merging carriers to the terminal. In one example, the configuration information may be transmitted via the RRC signal. In addition, when the base station configures the carrier merging in the terminal, it may determine which distribution node uses the cell. This can be used as a procedure for a base station to determine a cell to form a carrier merging when one centralized node is connected to a plurality of distributed nodes to control the distributed node.
  • the base station can perform the step of determining the secondary cell status for each of the one or more secondary cells configured in the terminal by the concentration node or the distributed node using the measurement report information and information on the amount of downlink data received from the core network entity (S230).
  • a base station can determine a secondary cell state for a specific cell constituting a carrier merge by using the measurement report information received from the terminal and the information on the amount of downlink data to be transmitted to the terminal received from the core network entity .
  • the step S230 may be performed after step S220, but may be performed before or at step S220.
  • the base station may determine the secondary cell state for a particular secondary cell that is added to the terminal when configuring the carrier merging.
  • step S230 may be performed before step S220, or may be performed in the same step.
  • the base station may transmit information to the mobile station including information instructing to configure the secondary cell added to the configuration information for configuring the carrier merging to the active state so that a specific secondary cell may be configured to be in an active state during the carrier merging configuration.
  • the base station may determine the secondary cell state for a particular secondary cell configured in the terminal after the carrier merging is configured in the terminal.
  • the BS may periodically or aperiodically receive the measurement report information from the UE and perform step S230 using the measurement report information.
  • the secondary cell state of the secondary cell can be determined by the concentration node or the distributed node.
  • the distribution node can determine the secondary cell state for the secondary cell based on the information on the radio quality information and the amount of downlink data included in the measurement report information. To this end, the distributed node needs to acquire measurement report information received from the terminal and information on the amount of downlink data transmitted from the concentration node. Also, the distributed node may perform the corresponding operation at the time of the carrier merging configuration or after the carrier merging configuration as described above.
  • the specific operation for the distribution node to determine the secondary cell state can be performed in various embodiments.
  • the distribution node in delivering the measurement report information transmitted from the terminal to the concentration node, the distribution node can directly confirm and decode the measurement report information.
  • the distributed node may transmit the measurement report information to the concentration node, and the wireless quality information including the measurement report information decoded and confirmed by the concentration node and the help information helpful in determining the secondary cell status, It is possible to receive it and utilize it. That is, the distributed node may directly utilize the measurement report information or may receive and utilize the wireless quality information including the measurement report information from the concentration node.
  • the detailed parameters and information elements included in each information will be described in detail below for each embodiment.
  • the concentration node can determine the secondary cell status for the secondary cell based on the measurement report information and information on the amount of downlink data. For this purpose, the concentration node can use the measurement report information received from the distributed node and the information on the amount of downlink data received from the core network entity. In addition, when the concentration node determines the secondary cell status for the secondary cell, status information for each secondary cell can be transmitted to the distributed node. This is because the information indicating the secondary cell state is configured in the MAC entity to be delivered to the terminal or the management of the secondary cell state is performed in the MAC entity.
  • the distributed node can confirm the information on the secondary cell to be activated determined by the convergence node through the secondary cell-based state information, and transmit information to the terminal by constructing information indicating the secondary cell state.
  • the status information for each secondary cell may be configured in a bitmap format, or may be configured to indicate and transmit secondary cell status information for each secondary cell index. Since the concentration node and the distributed node are not wireless communication sections, there is no restriction on information transmission.
  • the base station may perform a step of transmitting information indicating the secondary cell status of the secondary cell to the terminal (S240).
  • the distributed node can transmit information on the secondary cell to be activated or deactivated to the terminal.
  • the information indicating the secondary cell state may be transmitted to the terminal via the MAC Control Element (MAC CE).
  • the information indicating the secondary cell state may be configured in a bitmap format and transmitted to the terminal.
  • the information indicating the secondary cell state may be dynamically applied to the configuration depending on the number of secondary cells configured in the terminal.
  • the information indicating the secondary cell state may be configured such that the distributed node directly transmits the RRC message received from the concentration node to the terminal.
  • the distributed node when the distributed node determines the secondary cell state for the secondary cell, the distributed node can configure the information indicating the secondary cell state to the terminal without a separate instruction or signal.
  • the distribution node checks the status information for each secondary cell delivered by the concentration node and configures the information indicating the secondary cell status can do.
  • the base station periodically or non-periodically receives the measurement report information from the terminal.
  • the base station determines the secondary cell status for the specific one or more secondary cells configured in the terminal at the time of carrier merging or after the carrier merging is configured using the information on the received measurement report information and the amount of downlink data.
  • the determination of the secondary cell state can be performed by the concentration node or the distributed node of the base station, and the procedure for configuring the information indicating the secondary cell state according to the performing entity can be changed as described above.
  • cell measurement, carrier measurement, frequency measurement, and channel measurement are used in the same sense, and an operation to measure a channel state for an object or a designated cell or carrier to be added to a secondary cell (SCell) .
  • SCell secondary cell
  • Various channel measurement algorithms can be applied to the channel state measurement. For example, measurement algorithms using RSRP and RSRQ may be applied, and various other disclosed algorithms may be applied. Therefore, there is no limitation on the concrete measurement algorithm in this embodiment.
  • FIG. 3 is a view for explaining the operation of a base station according to another embodiment.
  • the distribution node of the base station may start the secondary cell deactivation timer for the secondary cell indicated as the active state (S310). For example, when the distribution node transmits information indicating a secondary cell state for instructing a specific secondary cell to be active, to the terminal, the distribution node starts an inactivity timer for the specific secondary cell.
  • the concentration node needs to be aware of the timer expiration or state change to the inactive state of the secondary cell.
  • the distributed node can perform the step of transmitting secondary cell state information to the concentration node when the inactivation timer is terminated (S320).
  • the distributed node may transmit the secondary state information, which is changed according to the inactivation timer end, to the concentration node in the secondary cell state information.
  • the distributed node may transmit to the concentration node information indicating that the inactivation timer for the secondary cell has expired and that the state of the corresponding secondary cell has been changed to the inactivity timer.
  • the secondary cell status information can be variously set by bit map, index information, and the like, but there is no limitation thereto.
  • the secondary cell state information may include the end information indicating the end of the secondary cell deactivation timer or the state information indicating the changed state according to the end of the secondary cell deactivation timer.
  • the base station can control the activation state of the secondary cell configured in the terminal through the above-described operation, and can accurately recognize the current state of the secondary cell can do.
  • the base station may also configure the secondary cell to be in the activated state even when instructing the merging of the carriers.
  • FIG. 4 is a diagram for explaining operations of a terminal according to an embodiment.
  • a UE performing carrier merging using a base station configured with one centralized node and one or more distributed nodes transmits measurement report information to a base station through a distributed node based on cell measurement configuration information (S410).
  • the convergence node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer.
  • the distributed node is a logical node that hosts the RLC layer, the MAC layer, and the PHY layer. You can send and receive information through the interface.
  • the terminal may receive measurement configuration information from the base station for cell measurements.
  • the UE performs an aperiodic cell measurement operation periodically or according to a preset event trigger, and transmits measurement report information including result information to the base station.
  • the measurement report information may be transmitted periodically or aperiodically.
  • the NR base station is divided into a concentrated node and a distributed node, and the distributed node transmits the measurement report information through the serving cell of the distributed node as the distributed node is set to perform the operation of the physical layer.
  • the UE may perform the step of configuring the merging of carriers by setting one or more secondary cells constituting the distributed node to the active state or the inactive state (S420).
  • the base station determines whether to merge the carriers constituting an additional cell to the terminal using the measurement report information and the downlink data amount information to be transmitted to the corresponding terminal.
  • the secondary cell that is additionally included in the terminal may be determined to be in the active state or may be determined to be in the inactive state.
  • the terminal may receive carrier merging configuration information from a base station to form a carrier merging configuration. If a specific secondary cell is indicated to be in the active state through the configuration information, the secondary cell can be configured to be in an active state together with the carrier merging configuration. Alternatively, all of the secondary cells other than the above-described PCell or PSCell may be instructed to be configured to be in an inactive state, in which case the terminal may configure the carrier merging to the inactive state.
  • the UE performs a cell measurement operation periodically or aperiodically, and transmits the result information to the BS through the measurement report information.
  • the terminal may transmit the secondary cell status of each of the one or more secondary cells determined by using the measurement report information and the information on the amount of downlink data when the concentration node or the distributed node configures the carrier merging by setting one or more secondary cells to the inactive state, (S430). ≪ / RTI >
  • the information indicating the secondary cell status may include secondary cell status information on the secondary cell determined based on information on the radio quality information and the amount of downlink data included in the measurement report information of the distributed node.
  • the radio quality information may be information received from the concentration node by the distributed node.
  • the radio quality information may be information directly decoded by the distributed node.
  • the information indicating the secondary cell status may include secondary cell status information for the secondary cell determined based on information on the radio quality information and the amount of downlink data included in the measurement report information of the concentration node.
  • the convergence node may transmit the determined secondary cell state information to the distributed node by constructing state information for each secondary cell.
  • the information indicating the secondary cell state can be transmitted through the MAC control element included in the distributed node.
  • the information indicating the secondary cell state may be state information for each secondary cell that the concentration node delivers to the distributed node.
  • the information indicating the secondary cell status may be information configured in the bitmap form by the distributed node based on the secondary cell status information.
  • the secondary cell state may be a bit map type MAC control element configured according to the decision when the distributed node determines the secondary cell state.
  • the information indicating the secondary cell state may be included in the RRC message received from the concentration node by the distributed node and transmitted as it is to the terminal.
  • the terminal can receive information indicating the secondary cell secondary cell state according to an instruction from the base station. Even if the secondary cell state for a specific secondary cell is determined at the time of merging carriers, the terminal can dynamically control the state for the secondary cell, and the terminal can receive information indicating the secondary cell state.
  • Each embodiment may be applied independently or in whole or in part.
  • the distribution node can determine the secondary cell status for the secondary cell (SCell) based on the information on the radio quality information and the downlink data amount included in the measurement report information.
  • DU can activate or deactivate the configured SCell.
  • DU can activate or deactivate SCell by sending a MAC CE containing information indicating activation or deactivation to the terminal.
  • DU can detect the occurrence of a problem in DU (or DU cell or DU secondary cell) based on CQI feedback, uplink measurement, HARQ ACK / NACK, RLC status report and the like. For terminal measurement reports that can be processed at the RRC layer, the DU can forward the corresponding RRC message to the CU.
  • uplink measurement for a cell not associated with a UE can be utilized by DU. The DU can send a notification to the CU.
  • a method for processing terminal measurement report information in a DU is a method for processing terminal measurement report information in a DU.
  • DU can directly use the measurement report received from the terminal to determine the secondary cell state of the secondary cell for the corresponding terminal and to transmit information indicating the secondary cell state indicating the activation or deactivation.
  • DU can determine the secondary cell status of the secondary cell provided through DU in consideration of the radio quality information of the secondary cell included in the measurement report information received from the terminal, the downlink data amount information transmitted from the core network through the CU, have.
  • DU designates the activation or deactivation of the secondary cell provided through DU in consideration of the radio quality information of the secondary cell included in the measurement report information received from the terminal, the downlink data amount information transmitted from the core network through the CU, and the like Information can be directed to the terminal.
  • DU can receive / process / parse / interpret / decode RRC message corresponding to UE measurement report information. For example, when DU receives terminal measurement report information from the terminal and transmits it to the CU, DU transmits radio quality information (e.g., RSRP, RSRQ, ..., A1, ...) of the secondary cell measurement object included in the terminal measurement report RRC message, A2, A3, A4, A5, and A6 measurement events), and determine the secondary cell state of the secondary cell based on the decoding result. To this end, DU may include some or all of the functionality of the RRC layer for processing terminal measurement report information.
  • radio quality information e.g., RSRP, RSRQ, ..., A1,
  • DU can receive radio quality information (or radio cell quality information) through the CU and can determine or indicate the secondary cell status of the secondary cell for the corresponding terminal.
  • DU transmits the measurement report information received from the terminal to the CU.
  • the CU can transmit the radio quality information of the secondary cell (or the cell group) included in the UE measurement report information through the F1AP signaling to DU so that DU can determine or indicate the secondary cell status of the secondary cell.
  • DU can determine the secondary cell state of the secondary cell provided through DU in consideration of the radio quality information of the secondary cell included in the F1AP message and the downlink data amount information transmitted from the core network through the CU.
  • DU considers the radio quality information of the secondary cell received from the CU and the downlink data amount information transmitted from the core network through the CU, and transmits information indicating the secondary cell state of the secondary cell provided through DU to the MAC Control element To the terminal.
  • the measurement report is transmitted to the CU through the DU through the RRC message.
  • This uplink RRC message carries out procedures for encryption and integrity protection at the PDCP layer of the UE and deciphering and integrity verification at the PDCP layer of the CU. Therefore, DUs that are not provided with the RRC function and the PDCP function can not confirm the radio quality information of the secondary cell included in the measurement report.
  • the CU may include the radio quality information of the secondary cell (or cell group) in the F1AP message and transmit it to the DU.
  • the CU may configure a secondary cell in the terminal via an RRC message (e.g., an RRC reconfiguration message).
  • the CU forwards the F1AP message including the RRC message used for constructing the secondary cell to the terminal.
  • the CU can send an F1AP message containing the RRC message to the DU via the F1-C interface.
  • DU sends the received RRC message to the UE. That is, the CU may forward the RRC message to the terminal via DU to add or configure one or more secondary cells to the terminal.
  • An F1AP message including an RRC message for adding or configuring one or more secondary cells to the terminal may include radio quality information that can help DU (MAC entity in DU) perform cell management or secondary cell status determination .
  • DU may use the radio quality information included in the F1AP message to determine cells to be activated for a specific secondary cell that is configured in the terminal and is in an inactive state.
  • the CU may send the radio quality information to the DU if either of the following cases occurs: For example, the CU may transmit the radio quality information to the terminal when it receives the terminal measurement report information from the terminal. Alternatively, the CU may transmit the radio quality information to DU when it is desired to change the secondary cell configuration state (arbitrary secondary cell state such as activation / deactivation / release) due to the wireless quality information change for any reason such as wireless quality change. Alternatively, the CU may transmit the radio quality information to the DU in order to assist the DU in determining the secondary cell status or in changing / indicating the secondary cell when the secondary cell is deactivated. Or, the CU wants to change the secondary cell configuration, such as adding / changing a new secondary cell.
  • the secondary cell configuration state arbitrary secondary cell state such as activation / deactivation / release
  • the DU can send the wireless quality information via the F1AP message have.
  • the CU may transmit radio quality information to the DU through the F1AP message when changing / modifying the secondary cell configuration via the RRC reconfiguration message.
  • the radio quality information (or measurement result information or help information for determining the activation / deactivation status of the secondary cell / cell group) transmitted by the CU via the F1AP message includes terminal identification information, measurement result sub frequency (measResultsServFreq) Cell ID, secondary cell ID, secondary cell ID, secondary cell ID, cell ID, physical cell identification information, sub frequency ID, SCell measurement result information (for example, rsrpResultSCell, rsrqResultSCell, measResultBestNeighCell), cgi- RSRP result, RSRP-range, RSSI, CSI-RS measurement result, NR SS measurement result, NR CSI-RS measurement result, A threshold value for determining whether to activate / deactivate the secondary cell / cell group, a threshold value for each cell, and the like.
  • measResultsServFreq measurement result sub frequency
  • SCell measurement result information for example, rsrpResultSCell, rsrqResultSCell, measResultBestN
  • Cell by cell Quality priority information for example, priority information for each cell of a cell to be activated, cell quality status information for each cell (for example, information for displaying up / down / middle / active / good / excellent) cell / frequency information (best measurement result cell information or more than best number measurement result cell / list / best result measurement result cell / frequency / information) (Eg, rsrpResult, rsrqResult, rs-sinr-Result, best beam ID), the best measurement result (eg, rsrpResult, rsrqResult, rs- The NR SS measurement result, the NR CSI-RS measurement result) and the measurement results of the secondary cell of the neighboring cell / DU measured by the above-described radio quality information . ≪ / RTI >
  • the UE identification information may include at least one of a C-RNTI, a CU UE F1AP ID, and a DU UE F1AP ID.
  • the CU UE F1AP ID represents an ID that can uniquely identify the UE association on the F1 interface within the DU associated with the CU and the corresponding CU.
  • the DU UE F1AP ID indicates an ID that can uniquely identify the UE association on the F1 interface within the DU.
  • the cell identification information may include at least one of a sub-cell index, a SCellIndex, and a cell ID.
  • the information indicating the secondary cell state may be set to 1 when the corresponding cell is activated and to 0 when it is inactivated.
  • information indicating the secondary cell state may be set to 1 if the cell is activated, and to 0 otherwise. If the secondary cell state information is not received, the corresponding cell can be considered to be in an inactive state.
  • the DU determines activation of the secondary cell deactivated according to at least one of the radio quality information provided by the CU or according to the activation help information provided by the CU or the activated secondary cell priority / set / list provided by the CU Information indicating the secondary cell state can be transmitted to the UE through the MAC CE.
  • DU can determine the secondary cell status of the secondary cell by securing the direct measurement report information, or receive the wireless quality information from the CU and determine the secondary cell status of the secondary cell. Also, DU can transmit information indicating the secondary cell status to the terminal.
  • Embodiment 2 Embodiment in which a concentration node determines and transmits a secondary cell state to a distributed node
  • the CU may configure or reconfigure or release one or more cells provided via DU.
  • the CU may monitor the radio link of one or more cells provided via DU.
  • At least one of the cell-related parameters of the DU may be configured by the CU.
  • cell identifiers e.g., Cell ID, SCellindex
  • downlink / uplink transmission power control parameters e.g., RACH parameters, etc.
  • the CU may decide to activate or deactivate a configured SCell based on measurement report information or the like. Meanwhile, the CU processes the incoming data for the terminal and delivers it to the DU.
  • the CU may determine the secondary cell state of the secondary cell provided through DU, configure information for indicating it, and transmit it to DU
  • the CU can transmit secondary cell status information (describing activation determination information for the secondary cell determined by the CU as secondary cell-specific status information) to the DU via the F1 interface control plane protocol F1-C have.
  • the TNL (Transport Network Layer) of F1-C is based on IP transport and can be configured with SCTP on top of IP.
  • the application layer signaling protocol may be referred to as F1AP.
  • state information for each secondary cell can be transmitted through a message on the F1AP.
  • the secondary cell-specific state information may be transmitted through a UE context management message (or UE context modification request message).
  • the secondary cell-specific status information may be transmitted through a cell setup message (or UE context setup request message).
  • a message on the F1AP may include at least one of status information for each secondary cell, terminal identification information, a cell identification information list provided through DU, activation / deactivation indication information for each cell identification information, and bearer identification information associated with the cell / And may include one piece of information.
  • the UE identification information may include at least one of a C-RNTI, a CU UE F1AP ID, and a DU UE F1AP ID.
  • CU UE The F1AP ID represents an ID that can uniquely identify the terminal association on the F1 interface within the DU associated with the CU and CU.
  • the DU UE F1AP ID indicates an ID that can uniquely identify the UE association on the F1 interface within the DU.
  • the cell identification information may include at least one of a sub-cell index, a SCellIndex, and a cell ID.
  • the state information for each secondary cell may be set to 1 if the secondary cell of the corresponding index is determined to be in the active state and to 0 if the secondary cell is determined to be inactive.
  • the state information for each secondary cell may be set to 1 if the secondary cell of the index is determined to be active, and to 0 otherwise. If the secondary cell state information is not received, the corresponding cell can be considered to be in an inactive state.
  • the secondary cell-specific status information included in the message on the F1AP includes terminal identification information, a cell identification information list provided via DU, secondary cell activation / deactivation indication information, and bearer identification information associated with the cell / And may include at least one piece of information.
  • the status information for each secondary cell included in the message on the corresponding F1AP may be configured in the bitmap format as shown in FIGS. 5 and 6. FIG.
  • FIG. 5 is a diagram exemplifying information indicating a secondary cell state when a subcell index (servcellindex) according to an embodiment is not greater than 7.
  • 6 is a diagram exemplarily showing information indicating a secondary cell state in a case where a subcell index (servcellindex) 7 according to an embodiment of the present invention is greater than seven.
  • one octet is applied to the information indicating the secondary cell state for each secondary cell that the CU sends to DU, as shown in FIG.
  • the sub-cell index indicates a short identity used for identifying one serving cell.
  • the Ci field indicates the activation / deactivation state of the SCell having the subcell index / SCellindex i if there is one SCell configured with the subcell index / SCellindex i. For example, if there is no SCell configured with a subcell index / SCellindex i in the terminal, the DU (MAC entity of DU) can ignore the corresponding Ci field of the information received from the CU.
  • the DU (MAC entity of DU) receives the received Ci field (indicating full activation or deactivation Can be transmitted to the terminal as it is.
  • the Ci value may be set to 1 to indicate that SCell with the subcell index / SCellindex i should be activated.
  • the Ci value can be set to zero to indicate that SCell with subcell index / SCellindex i should be deactivated.
  • the information on the secondary cell state of the secondary cell included in the message on the corresponding F1AP may be provided by the activation / deactivation state information field for each cell.
  • the CU determines the secondary cell state for the secondary cell, and DU transmits the information to the terminal, and DU can forward the information indicating the secondary cell state to the terminal, or DU can change the secondary cell state.
  • the information indicating the secondary cell state that DU sends to the UE may be an RRC message generated by the MAC CE or the CU and included in the F1AP and transferred to the DU as described above.
  • the CU needs to recognize the contents accurately. That is, the CU controls the radio resources configured in the UE, so that when the UE configures the CA, the CU must accurately recognize the secondary cell state of each secondary cell.
  • a method of recognizing the activation state information of the secondary cell, which is performed in the MAC layer, by the CU is required by performing the function of distinguishing the CU from the DU.
  • the CU controls the radio resource configuration control of the UE.
  • the CU can perform modification / modification / reconfiguration of the configuration applied to the UE in consideration of mobility, change of the quality of the radio cell, and the like. Therefore, the CU needs to know the activation / deactivation state of the secondary cell.
  • the secondary cell ratio activation timer (sCellDeactivationTimer) expires, it can be known only from DU including the MAC entity.
  • the secondary cell state information can be transmitted to the CU so that the CU can know the activation / deactivation status information of the secondary cell.
  • the secondary cell state information may be transmitted via a message on the F1AP.
  • a message on the F1AP including the secondary cell status information includes terminal identification information, a cell identification information list provided through DU, activation / deactivation indication information per cell identification information, and bearer identification information associated with the cell / And may include one or more pieces of information.
  • the terminal identification information may include at least one of a C-RNTI, a CU UE F1AP ID, and a DU UE F1AP ID.
  • CU UE The F1AP ID represents an ID that can uniquely identify the terminal association on the F1 interface within the DU associated with the CU and the CU.
  • the DU UE F1AP ID indicates an ID that can uniquely identify the UE association on the F1 interface within the DU.
  • the cell identification information may include at least one of a sub-cell index, a SCellIndex, and a cell ID.
  • the activation / deactivation indication information may be set to 1 when the corresponding cell is activated and to 0 when it is deactivated.
  • the activation / deactivation indication information may be set to 1 if the cell is activated, and to 0 otherwise. If the activation / deactivation instruction information is not received, the corresponding cell may be considered to be inactive.
  • the message on the F1AP including the secondary cell status information includes terminal identification information, a cell identification information list provided via DU, secondary cell activation / deactivation indication information, and bearer identification information associated with the cell / cell group can do.
  • the secondary cell activation / deactivation information included in the message on the corresponding F1AP may be provided in the bitmap format described above.
  • the secondary cell activation / deactivation information included in the message on the corresponding F1AP may be provided by the cell activation / deactivation status information field.
  • the CU can acquire state information of each secondary cell configured in the UE, and control the radio resources of the UE using the obtained state information.
  • carrier merging in which the above-described operation of determining and changing the secondary cell state is required will be described below.
  • embodiments in which carrier merging is performed between different DUs in terms of being capable of performing carrier merging by configuring cells in UEs different from each other as described above will be described.
  • the PSCell which is a cell configured to have a special function among the cells included in the secondary cell group, is always configured to be in an activated state.
  • the other secondary cells in the cells included in the secondary cell group are configured to be in a deactivated state.
  • all non-PC cells are configured to be inactive.
  • CA is applied through a cell provided through two DUs, CU and DU1, and CU and DU2 may co-sited, or CU and DU1 and CU and DU2 may be connected through an ideal backhaul . Or between the DU1 and DU2 through an ideal backhaul.
  • DU1 and DU2 are used to distinguish different DUs from each other, and the term is not limited.
  • efficient cell operation can be controlled for the cell / secondary cell / cell group associated with DU1 or the cell / secondary cell / cell group associated with DU2 according to the coordination of the CU.
  • the following detailed embodiments may be used individually or in combination for this purpose.
  • Embodiment 1 An embodiment in which the cell is configured to be inactive when all cells associated with DU2 are configured in the UE
  • the base station may be configured to provide a specific PDU session / flow / flow group / traffic type / radio bearer, DU2 (or a cell associated with DU2, (Radio resource allocation request / offloading) through one or more cells (e.g., one or more cells), and perform a procedure for adding DU2.
  • the CU wants to configure the user data to be transmitted only through DU2 (or one or more cells provided through DU2 or one or more cells provided through DU2) for a specific PDU session / flow / flow group / traffic type / , One or more cells must be activated on DU2 to send and receive data for that PDU session / flow / flow group / traffic type / radio bearer.
  • DU1 and / or DU2 are provided via DU1 and / or DU2 for a particular PDU session / flow / flow group / traffic type / radio bearer. If it is necessary to transmit data through DU1, after checking through the cells on DU1 in consideration of radio quality, data amount, DU2 load, etc. of the DU2 cell of the corresponding UE, it is necessary to add and / It is possible to deactivate and configure all the cells of DU2 because it can transmit data.
  • the UE since the UE has already established the RRC connection through the DU1 and the CU and the backhaul to the core network is also terminated in the CU, the UE can not establish a connection to the specific PDU session / flow / flow group / traffic type / radio bearer It is not necessary to configure the user data to be transmitted only through DU2 (or a cell associated with DU2 or one or more cells provided through DU2). Therefore, it is preferable to configure the transmission of user data by simultaneously using one or more cells provided through DU1 and / or DU2, and it is preferable to control the scheduling between the DUs by controlling the CU.
  • the BS may configure the UE to be inactive for all cells of the DU2.
  • a cell group provided through a node having a different scheduler is configured to have at least one active cell PSCell, whereas when providing merge carriers through two DUs, all cells are deactivated As shown in FIG.
  • the base station can configure the activation state of all cells of the DU2 by activating or deactivating each of the cells of the DU2.
  • the base station can configure the active state of the corresponding cell for each cell of the DU2 by activating or deactivating the DU2 through the RRC signaling.
  • the base station may configure the activation state of the corresponding cell group for the specific cell group of DU2 by activating or deactivating the corresponding cell group.
  • the base station may configure the UE to deactivate (consider) the corresponding cell / cell group for a particular cell / cell group of DU2 or for all cell / cell groups.
  • Embodiment 2 Embodiment for indicating activation / deactivation of cells associated with DU2 through DU1
  • the CU may determine data offloading via DU2 in consideration of the measurement report received from the terminal, the amount of downlink data received from the core network, and the like.
  • the CU may send an instruction to DU1 to control activation / deactivation of a particular cell via DU2.
  • DU1 (or DU1 MAC entity) can instruct the terminal to activate / deactivate a specific cell of DU2 through L2 signaling (MAC Control element).
  • the DU1 (or DU1 MAC entity) can send confirmation information on the activation / deactivation indication of a particular cell of the DU2 to the CU or via the CU to DU2.
  • the CU may send an instruction to DU2 to control to activate / deactivate a particular cell via DU2.
  • DU2 (or DU1 MAC entity) can instruct the terminal to activate / deactivate a specific cell of DU1 through L2 signaling (MAC Control element).
  • the DU2 (or DU2 MAC entity) may send confirmation information to the CU or via the CU to indicate activation / deactivation of a particular cell of DU1 to DU1.
  • a base station (or CU or DU1) divides a cell through DU1 and a cell through DU2 to form a measurement on the terminal and transmits the measurement information when the terminal transmits the measurement report
  • DU1 (or DU1 MAC entity) can instruct the terminal to activate / deactivate a specific cell of DU2 through L2 signaling (MAC Control element).
  • the DU1 (or DU1 MAC entity) can send confirmation information on the activation / deactivation indication of a particular cell of the DU2 to the CU or via the CU to DU2.
  • DU2 may instruct the terminal to activate / deactivate a particular cell of DU1 via an L2 signaling (MAC Control element).
  • the DU2 (or DU2 MAC entity) may send confirmation information to the CU or via the CU to indicate activation / deactivation of a particular cell of DU1 to DU1.
  • the base station (or the CU or DU1) can distinguish cells through DU1 and cells through DU2 to instruct the UE to configure the measurement. Then, the UE can transmit the measurement report by dividing the cell through the DU1 and the cell through the DU2 by the reporting when the measurement report is transmitted.
  • the receiving DU1 (or DU1 MAC entity) can instruct activation / deactivation of a particular cell of DU2 through the L2 signaling (MAC Control element).
  • L2 signaling MAC Control element
  • the receiving CU may instruct DU1 (or DU1 MAC entity) to instruct activation / deactivation of a particular cell of DU2 through the L2 signaling (MAC Control element) based on it.
  • the CU receives the measurement reporting information so that the DU1 (or DU1 MAC entity) instructs the terminal to activate / deactivate the specific cell of DU2 through the L2 signaling (MAC Control element) DU1 < / RTI >
  • DU2 (or DU2 MAC entity) may determine activation / deactivation for a particular cell in the DU2 cell group.
  • DU2 may instruct the terminal to activate for a particular cell in the DU2 cell group via DU1 (or DU1 MAC entity) .
  • DU2 may transmit information indicating activation / deactivation of a particular cell in the DU2 cell group to DU1 via the CU.
  • Information indicating that DU2 activates / deactivates for a specific cell in the DU2 cell group as DU1 through the CU can be transmitted on the F1AP message between DU2 and CU.
  • Information indicating that DU2 activates / deactivates for a specific cell in the DU2 cell group as DU1 through the CU can be transmitted on the F1AP message between the CU and DU1.
  • DU2 may transmit information indicating activation / deactivation for a particular cell in the DU2 cell group to DU1 via a direct interface with DU1 (e.g., an application protocol message on the DU and DU control plane interface) .
  • DU1 e.g., an application protocol message on the DU and DU control plane interface
  • a specific cell in the aforementioned DU2 cell group may be a special cell (e.g., PSCell providing PUCCH or PUCCH SCell).
  • PSCell providing PUCCH or PUCCH SCell.
  • DU1 sends acknowledgment information (ACK / NACK).
  • the DU additional procedure for inter DU carrier aggregation will be described below.
  • the DU additional procedure described below is exemplarily described in order by dividing each step, but each step may be omitted, merge, or change the order.
  • Step 0 The UE establishes an RRC connection through DU1 and CU.
  • the CU instructs the terminal to configure the measurement through DU1, and the terminal sends the RRC measurement report to the CU.
  • the CU may be configured to receive DU2 (or a cell associated with DU2 or one or more cells provided via DU2) for a particular PDU session or for a core network bearer (or E-RAB, or a specific wireless flow group) (Radio resource allocation request / offloading) through the base station.
  • DU2 or a cell associated with DU2 or one or more cells provided via DU2
  • a core network bearer or E-RAB, or a specific wireless flow group
  • Step 1 For example, the CU (or CU-CP) generates a terminal context.
  • the CU can send an F1AP terminal context setup request message to DU2.
  • the corresponding F1AP context terminal context setup request message includes a UE context for a particular radio flow or for a particular PDU session or for a specific radio bearer (or E-RAB / core network bearer, or specific radio flow group) and CU UL TEID < / RTI >
  • the UE context includes UE aggregated maximum bit rate, UE Aggregate maximum bit rate to be processed in DU2, radio bearer information to be set or QoS flow property information (flow ID, flow level QoS parameter, PDU session level information, radio bearer ID, QoS parameters, and RRC context) and information between QoS flows and DRB mapping information.
  • the RRC context may include RRC configuration information (e.g., RLC configuration information, MAC configuration, etc.) for a particular wireless flow or for a particular PDU session or for a particular radio bearer (or E-RAB / core network bearer, Information on one or more of logical channel configuration information, cell configuration information).
  • RRC configuration information e.g., RLC configuration information, MAC configuration, etc.
  • the RRC configuration information described above may indicate the configuration information of the UE or DU2 to indicate the configuration information of the DU2 entity (RLC, MAC, logical channel, cell) for configuring data communication with the UE for the UE.
  • RLC Radio Link Control
  • MAC Radio Network Control
  • logical channel cell
  • the logical channel configuration information may include mapping information between a specific radio bearer and a logical channel ID.
  • the cell configuration information may include mapping information between a specific radio bearer and cell configuration information, or mapping information between a specific logical channel identifier and cell configuration information.
  • the CU determines the radio bearer identification information for the particular radio flow described above, or for a particular PDU session or for a specific radio bearer (or E-RAB / core network bearer, or specific radio flow group).
  • Logical channel identification information to be used by the DU2's MAC for the particular wireless flow described above or for a particular PDU session or for a specific radio bearer (or E-RAB / core network bearer, or specific radio flow group) is determined by the CU.
  • the logical channel identification information to be used in the MAC is determined by the CU.
  • the message sent by the CU may include recent measurement information for DU2 to select a cell to configure in the UE and configure the cell in the UE.
  • DU2 includes secondary cell information to be configured in a cell to be configured in the terminal or a special cell to be configured in the terminal (for example, a PUCCH configuration cell, a cell to be always activated) And transmits it to the CU.
  • the CU can transmit this information to the terminal through DU1.
  • a message sent by the CU may include recent measurement information as help information for DU2 (or the MAC entity of DU2) to activate another cell initially through the activated cell on the DU2 selected by the CU.
  • DU2 can configure / activate the corresponding cell upon reception of data from the CU and / or instruction information to configure / activate a specific cell from the CU.
  • the CU may send a second DU addition request message to DU2.
  • the second DU addition request message may include one or more of the above-described information.
  • the radio quality information (or measurement result information or help information for determining activation / deactivation of the secondary cell / cell / cell group) transmitted by the CU through the F1AP message includes terminal identification information, measurement result sub frequency (measResultsServFreq) Cell index, cell ID, physical cell identification information, sub frequency ID, SCell measurement result information (rsrpResultSCell, rsrqResultSCell, measResultBestNeighCell), cgi-info (cellGlobalId, trackingAreaCode, plmn- RSRP-range, RSSI, CSI-RS measurement result, NR SS measurement result, NR CSI-RS measurement result, measurement event (for example, LAN based paging area / code information), Idle mode measurement result, RSRP result, RSRQ result, Threshold value for determining whether to activate / deactivate the secondary cell / cell / cell group, threshold value for each cell, cell quality priority information (for example, A1, A2, A3, A4, A5,
  • the terminal identification information may be at least one of a C-RNTI, a CU UE F1AP ID, and a DU UE F1AP ID.
  • CU UE The F1AP ID represents the ID that can uniquely identify the terminal association on the F1 interface within the CU and the associated DU.
  • the DU UE F1AP ID indicates an ID that can uniquely identify the UE association on the F1 interface within the DU.
  • the cell identification information may be one of a sub-cell index, a SCellIndex, and a cell ID.
  • the activation / deactivation indication information can be set to 1 when the corresponding cell is activated and to 0 when it is inactivated.
  • the DU determines activation of the secondary cell deactivated according to the activation assistance information provided by the CU or the activation secondary cell priority / set / list provided by the CU by using one or more pieces of the wireless quality information provided by the CU, Can send an activation / deactivation indication via MAC CE.
  • Step 2 DU2 can perform an admission control operation.
  • DU2 may constitute a lower layer (one or more layers of PHY / MAC / RLC). DU2 may store the received terminal context. DU2 can create a local terminal context. DU2 can construct a DU2 lower layer entity through the RRC context received via the CU. Or DU2 may store the RRC context / terminal context received via the CU.
  • the message that DU2 sends to the CU may include configuration information for random access to the DU2 cell.
  • it may include dedicated RACH preamble, association information between RACH resource / preamble and SS block, and association information between RACH resource / preamble and CSI-RS.
  • DU2 may send a second DU addition request acknowledgment / response message to the CU.
  • the second DU addition request acknowledgment / response message may include one or more of the above described information.
  • admission control may not be needed in DU2.
  • the delay between CU and DU is small, so it may not be necessary to precede step 3 in step 1 and step 2 in advance.
  • the CU can start the message transmission in steps 1 and 3 at the same time.
  • the step 3 message can be started first and the step 1 message transmission can be performed.
  • Step 3 The CU sends an RRC connection reconfiguration message to the terminal through DU1.
  • an F1AP message transmitted by the CU to DU1 may include an RRC connection reconfiguration message generated by the CU.
  • the RRC connection reconfiguration message described above may include configuration information for random access in the DU2 cell included in the message received from the DU2 in the RRC connection reconfiguration message.
  • the CU may include configuration information for random access in its own managed DU2 cell in the RRC connection reconfiguration message.
  • the configuration information for random access may include dedicated RACH preamble, association information between RACH resource / preamble and SS block, and association information between RACH resource / preamble and CSI-RS.
  • the RRC reconnection message generated by the CU can determine the RRC configuration information provided through DU2 and transmit it to the terminal through DU1.
  • the CU can self-determine and generate configuration information for the DU2's radio resources.
  • the information contained therein includes RLC configuration information transmitted over DU2 for a particular wireless flow or for a particular PDU session or for a specific radio bearer (or E-RAB / core network bearer, or specific radio flow group), MAC configuration information (Which may not be needed if the UE is configured with a single MAC), logical channel configuration information, and cell configuration information.
  • the CU can determine and generate the configuration information for the radio resources of DU1 by itself.
  • the information included therein includes RLC configuration information transmitted over DU1 for a specific wireless flow or for a particular PDU session or for a specific radio bearer (or E-RAB / core network bearer, or specific radio flow group), MAC configuration information , Logical channel configuration information, and cell configuration information.
  • the CU is used to transmit data for a particular radio flow or for a particular PDU session or for a specific radio bearer (or E-RAB / core network bearer, or a specific radio flow group) simultaneously using the radio resources of DU1 and DU2
  • the radio bearer identification information for the radio bearer can be determined.
  • the CU may determine each logical channel id, logical channel configuration information provided through each DU associated with the radio bearer.
  • RLC configuration information For example, RLC configuration information, MAC configuration information (which may be unnecessary if the UE is configured as a single MAC), transmitted through DU2 included in the RRC connection reconfiguration message (CU transmits to UE through DU1) , Logical channel configuration information, cell configuration information, or one or more of the above-described information may be transmitted through one container.
  • the container may be a container that is distinct from the scg-configuration defined over the conventional DC.
  • CU for example, CU1
  • CU2 for example, CU2
  • DU radio resources connected to CU1 and DU radio resources connected to CU2 You should be able to configure the dual connectivity you use. Therefore, the container providing the merging via two configuration DUs connected through one CU and the scg-configuration should be instructed to the terminal by a separate information / container.
  • the RLC configuration information, the MAC configuration information (which may be unnecessary if the UE is configured as a single MAC), transmitted through the DU2 included in the RRC connection reconfiguration message (the CU transmits to the terminal via DU1) ,
  • the logical channel configuration information, the cell configuration information, or the above-described information is stored in the same container as the RLC configuration information, the MAC configuration information, the logical channel configuration information, the cell configuration information, or the above- Lt; / RTI >
  • the container may be a container that is distinct from the scg-configuration defined over the conventional DC.
  • the container may be included in a container that includes a CU (or base station or MCG) radio resource configuration information / radio bearer configuration information / cell configuration information / cell group configuration information.
  • the container may be included in a container including radio resource configuration information / radio bearer configuration information / cell configuration information / cell group configuration information via the CU (or base station or MCG) DU1.
  • Step 4 The UE applies the new configuration and transmits the RRC connection reconfiguration completion message to the CU through DU1.
  • Step 5 The UE sends a random access preamble to DU2, and DU2 can transmit a random access response to the UE.
  • the present invention effectively performs the state of the secondary cell between the CU and the DU in the data transmission using the carrier merging technique in the radio access network provided through the upper layer separation structure, So that it can be applied.
  • FIG. 7 is a diagram illustrating a configuration of a base station according to an embodiment.
  • a base station 700 including one central node and one or more distributed nodes for controlling the merging of carriers in a terminal includes a receiver 730 for receiving measurement report information on a cell from a terminal, The concentration node determines the merging of the carriers using the cells constituting the distributed nodes and uses the measurement report information and information on the amount of downlink data received from the core network entity, A control unit 710 for controlling the secondary cell state for each of the above secondary cells and a transmission unit 720 for transmitting information indicating the secondary cell state to the secondary cell to the terminal by the distributed node.
  • the convergence node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer.
  • the distributed node is a logical node that hosts the RLC layer, the MAC layer, and the PHY layer. Information can be exchanged.
  • the transmitter 720 may transmit measurement configuration information to the terminal so that the terminal can measure the quality of the cell.
  • the transmitter 720 may transmit the configuration information for merging carriers to the terminal if it is determined that carrier merging is to be configured in the terminal.
  • the configuration information may be transmitted via the RRC signal.
  • the control unit 710 determines whether it is necessary to configure an additional cell in the terminal using the measurement report information received from the terminal. For example, the control unit 710 determines whether it is necessary to configure an additional cell in the terminal using the measurement report information and the downlink data information to be transmitted to the terminal. In addition, when configuring the carrier merging to the terminal, the control unit 710 may determine which of the distributed nodes use the cell. This can be used as a procedure for the base station 700 to determine a cell for constituting a carrier merge when one centralized node is connected to a plurality of distributed nodes to control the distributed node.
  • the secondary cell state of the secondary cell can be determined by the concentration node or the distributed node.
  • the distribution node can determine the secondary cell state for the secondary cell based on the information on the radio quality information and the amount of downlink data included in the measurement report information. To this end, the distributed node needs to acquire measurement report information received from the terminal and information on the amount of downlink data transmitted from the concentration node. Also, the distributed node may perform the corresponding operation at the time of the carrier merging configuration or after the carrier merging configuration as described above.
  • the specific operation for the distribution node to determine the secondary cell state can be performed in various embodiments.
  • the distribution node in delivering the measurement report information transmitted from the terminal to the concentration node, can directly confirm and decode the measurement report information.
  • the distributed node may transmit the measurement report information to the concentration node, and the wireless quality information including the measurement report information decoded and confirmed by the concentration node and the help information helpful in determining the secondary cell status, It is possible to receive it and utilize it. That is, the distributed node may directly utilize the measurement report information or may receive and utilize the wireless quality information including the measurement report information from the concentration node.
  • the concentration node can determine the secondary cell status for the secondary cell based on the measurement report information and information on the amount of downlink data. For this purpose, the concentration node can use the measurement report information received from the distributed node and the information on the amount of downlink data received from the core network entity.
  • the concentration node determines the secondary cell status for the secondary cell
  • status information for each secondary cell can be transmitted to the distributed node. This is because the information indicating the secondary cell state is configured in the MAC entity and is transmitted to the UE. That is, the distributed node can confirm the information on the secondary cell to be activated determined by the convergence node through the secondary cell-based state information, and transmit information to the terminal by constructing information indicating the secondary cell state.
  • the status information for each secondary cell may be configured in a bitmap format or may be configured to transmit individual index information.
  • the distributed node can transmit information about the secondary cell to be activated or deactivated to the terminal.
  • information indicating the secondary cell state may be transmitted to the terminal via the MAC information element (MAC CE).
  • the information indicating the secondary cell state may be configured in a bitmap format and transmitted to the terminal.
  • the information indicating the secondary cell state may be dynamically applied to the configuration depending on the number of secondary cells configured in the terminal.
  • the distributed node when the distributed node determines the secondary cell state for the secondary cell, the distributed node can configure the information indicating the secondary cell state to the terminal without a separate instruction or signal.
  • the distribution node checks the secondary cell status information delivered by the concentration node and configures the information indicating the secondary cell status using the confirmed information .
  • control unit 710 may start the secondary cell deactivation timer for the secondary cell indicated as the activated state.
  • the distributed node can transmit the secondary cell state information to the concentration node.
  • the transmitting unit 720 and the receiving unit 730 are used to transmit and receive signals, messages, and data necessary for performing the above-described present disclosure to and from the terminal.
  • FIG. 8 is a diagram illustrating a configuration of a terminal according to an embodiment.
  • a UE 800 performing a carrier merge using a base station including one centralized node and one or more distributed nodes transmits measurement report information to a base station through a distributed node based on cell measurement configuration information
  • the convergence node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer.
  • the distributed node is a logical node that hosts the RLC layer, the MAC layer, and the PHY layer. You can send and receive information through the interface.
  • Receiver 830 may also receive measurement configuration information from the base station for cell measurements.
  • the controller 810 performs an aperiodic cell measurement operation according to a periodic or preset event trigger, and the transmitter 820 transmits the measurement report information including the result information to the base station.
  • the measurement report information may be transmitted periodically or aperiodically.
  • Receiving unit 830 can receive carrier merging configuration information from the base station to form a carrier merging configuration. If a specific secondary cell is indicated to be in the active state through the configuration information, the secondary cell can be configured to be in an active state together with the carrier merging configuration. Alternatively, all of the secondary cells other than the above-described PCell or PSCell may be instructed to be in an inactive state, in which case the controller 810 may configure the carrier merging to the inactive state.
  • the controller 810 periodically or aperiodically performs the cell measurement operation, and the transmitter 820 transmits the result information to the base station through the measurement report information.
  • the information indicating the secondary cell status may include secondary cell status information on the secondary cell determined based on information on the radio quality information and the amount of downlink data included in the measurement report information of the distributed node.
  • the radio quality information may be information received from the concentration node by the distributed node.
  • the radio quality information may be information directly decoded by the distributed node.
  • the information indicating the secondary cell status may include secondary cell status information for the secondary cell determined based on information on the radio quality information and the amount of downlink data included in the measurement report information of the concentration node.
  • the convergence node may transmit the determined secondary cell state information to the distributed node by constructing state information for each secondary cell.
  • the information indicating the secondary cell state can be transmitted through the MAC control element included in the distributed node.
  • the information indicating the secondary cell state may be state information for each secondary cell that the concentration node delivers to the distributed node.
  • the information indicating the secondary cell status may be information configured in the bitmap form by the distributed node based on the secondary cell status information.
  • the secondary cell state may be a bit map type MAC control element configured according to the decision when the distributed node determines the secondary cell state.
  • controller 810 performs carrier merging in a next-generation radio access network of an upper layer functional separation structure necessary for performing the above-described embodiments, and performs overall control of the overall terminal (800).
  • the transmitting unit 820 and the receiving unit 830 are used to transmit and receive signals, messages, and data necessary for performing the above-described present disclosure to and from the base station.
  • system generally refer to a computer-related entity hardware, a combination of hardware and software , Software, or software in execution.
  • the above-described components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an entity, an execution thread, a program and / or a computer.
  • a component can be a controller or an application running on a processor and a controller or processor.
  • One or more components can reside within a process and / or thread of execution, and a component can reside on one system or be deployed on more than one system.

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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 comprenant les étapes consistant à : recevoir, en provenance d'un terminal, des informations de rapport de mesure d'une cellule ; déterminer, par un noeud de concentration, une configuration d'agrégation de porteuses pour un terminal en utilisant une cellule comprenant un ou plusieurs nœuds de distribution ; déterminer, par le noeud de concentration ou le noeud de distribution, un état de cellule secondaire de chacune d'une ou de plusieurs cellules secondaires configurées pour le terminal, à l'aide des informations de rapport de mesure et des informations sur la quantité de données de liaison descendante reçues en provenance d'une entité de réseau central ; et transmettre, par le noeud de distribution, des informations indiquant l'état de cellule secondaire de la cellule secondaire au terminal, le noeud de concentration étant un noeud logique hébergeant une couche RRC, une couche SDAP, et une couche PDCP, le noeud de distribution est un noeud logique hébergeant une couche RLC, une couche MAC et une couche PHY, et le noeud de concentration et un ou plusieurs nœuds de distribution transmettent ou reçoivent des informations par l'intermédiaire d'une interface F1.
PCT/KR2018/007844 2017-07-14 2018-07-11 Procédé et appareil de commande d'agrégation de porteuses pour un réseau sans fil de prochaine génération WO2019013543A1 (fr)

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KR1020180079460A KR20190008114A (ko) 2017-07-14 2018-07-09 차세대 무선네트워크를 위한 캐리어 병합 제어 방법 및 장치
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CN110536411A (zh) * 2019-02-26 2019-12-03 中兴通讯股份有限公司 终端位置获取方法、装置、网络设备和存储介质
CN110536411B (zh) * 2019-02-26 2023-03-21 中兴通讯股份有限公司 终端位置获取方法、装置、网络设备和存储介质
CN111726890A (zh) * 2019-03-21 2020-09-29 中国移动通信有限公司研究院 Sdap实体的状态切换方法、数据处理方法及通信设备
CN111726890B (zh) * 2019-03-21 2022-06-07 中国移动通信有限公司研究院 Sdap实体的状态切换方法、数据处理方法及通信设备
CN112954712A (zh) * 2019-12-10 2021-06-11 中国移动通信有限公司研究院 数据采集的方法及设备
CN112954712B (zh) * 2019-12-10 2023-08-15 中国移动通信有限公司研究院 数据采集的方法及设备
WO2022005751A1 (fr) * 2020-06-29 2022-01-06 Qualcomm Incorporated Mesure de cellule dans une mobilité de couche physique (phy) et de couche de contrôle d'accès au support (mac)
WO2022177673A1 (fr) * 2021-02-17 2022-08-25 Qualcomm Incorporated Mesure de cellule et rapport relatif à la mobilité dans des systèmes de communication sans fil distribués
US11576069B2 (en) 2021-02-17 2023-02-07 Qualcomm Incorporated Cell measurement and reporting for mobility in distributed wireless communications systems

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