KR20190008114A - Methods for controlling a carrier aggregation for next generation wireless network and Apparatuses thereof - Google Patents

Abstract

The present invention relates to a method and device for controlling carrier aggregation in a next generation wireless access network configured by a higher hierarchy function separating structure or an LTE wireless access network. More specifically, the present invention relates to a method and device for determining activated states of secondary cells configured by carrier aggregation. According to one embodiment of the present invention, a method, in which a base station configured by one centralized node and one or more distributed nodes controls carrier aggregation of a terminal, comprises: a step of receiving measurement reporting information on a cell from a terminal; a step in which the centralized node uses a cell configured by one or more distributed nodes to determine a configuration of carrier aggregation in the terminal; a step in which the centralized node or the distributed node determines secondary cell states for each of one or more secondary cells configured in the terminal by using the measurement reporting information and information on downlink data amount received from a core network entity; and a step in which the distributed node transmits information indicating a secondary cell state for a secondary cell to the terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and an apparatus for controlling a carrier aggregation for a next-

The present invention relates to a method and apparatus for controlling carrier merging in a next-generation radio access network or an LTE radio access network, which is composed of an upper 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. For example, in a mobile communication system such as LTE (Long Term Evolution), LTE-Advanced, and 5G of 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, .

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.

In addition, in the case of a secondary cell other than a primary cell (PCell) or a specific cell (ex, PSCell) having a function of establishing an RRC connection and transmitting / receiving an uplink signal when a carrier merging is performed, It is possible to change the activation state according to the state of use.

However, in the next generation radio access network such as 5G, unlike the conventional LTE base station, discussions are underway to distribute the functions of the base stations to the logical nodes.

Therefore, in the case where the functions of the base stations are separately configured in the next generation radio access network, a specific procedure for determining and transmitting the performing entity and the secondary cell state to the function of determining the conventional secondary cell state and transmitting the indication information to the terminal Needs to be changed.

However, the discussion of the procedure for changing the activation state is not yet proceeded, so that a data transmission / reception operation through carrier merging can not be performed in the case of a terminal using a next generation radio access network.

In the above background, 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.

According to an embodiment of the present invention, there is provided a method of controlling a carrier merging of a terminal, the base station including one central node and at least one distributed node, the method 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.

According to another embodiment of the present invention, there is provided a method of performing carrier merging using a base station including a centralized node and at least one distributed node, the method 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.

According to another embodiment of the present invention, there is provided 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.

In an exemplary embodiment of the present invention, 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 And a receiver for receiving information indicating a secondary cell state of each of the at least one secondary cell determined using the measurement report information and the information on the amount of downlink data, wherein the concentration node hosts the RRC layer, the SDAP layer, and the PDCP layer And 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.

In addition, 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.

1 is a diagram illustrating a base station and a core network structure in a next generation radio access network.
2 is a view for explaining the operation of a base station according to an embodiment.
3 is a view for explaining the operation of a base station according to another embodiment.
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.
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.
7 is a diagram illustrating a configuration of a base station according to an embodiment.
8 is a diagram illustrating a configuration of a terminal according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, 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. Alternatively, 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.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. 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.

That is, 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.

Since the various cells listed above exist in the base station controlling each cell, 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.

Therefore, 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.

Herein, 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 this 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. Here, 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) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access), FDMA (Frequency Division Multiple Access), OFDMA (Orthogonal Frequency Division Multiple Access), OFDM-FDMA, OFDM- . 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.

In systems such as LTE and LTE-advanced, 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.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, 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 >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, 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'.

In the following description, 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.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, 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). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

Enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) have been proposed as typical usage scenarios in NR (New Radio), which is under discussion in 3GPP.

In this specification, 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.

For example, 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. If necessary, 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.

Hereinafter, for convenience of description, the conventional wireless access technology will be described as LTE and the new wireless access technology discussed in 3GPP will be described as NR. Also, the base station may be an eNB using LTE technology, a gNB using NR technology, and separately described according to need.

The term " 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. Alternatively, a terminal can transmit and receive data using a plurality of cells through cells controlled by two base stations. As described below, 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.

In the present specification, information included in each message and signal will be described in detail, but the message and signal may include various information as well as information described below. For example, 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.

In addition, the following description will be given based on the procedures that can be applied to NR technology. However, this is for convenience of understanding, and can be applied to all wireless communication technologies to which various carrier merging techniques including conventional LTE technology including NR technology are applied. Thus, there is no limitation of the wireless access technology to which this disclosure applies.

Carrier merging (CA) technology is a technique for boosting the data rate for a terminal via an additional cell. In the conventional CA technology, 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. However, in the conventional CA technology, when the base station configures the secondary cell as a terminal, 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. That is, there is a temporal delay between the configuration procedure for configuring the secondary cell and the operation for controlling the secondary cell state of the secondary cell configured in the merging of carriers. On the other hand, 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. When an additional state is determined according to the state setting of the base station or the terminal, Can be determined.

In addition, in the conventional carrier merging, when the base station determines the secondary cell state of the secondary cell, the determination may be performed by the control entity of the base station. However, as described below, 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.

It is also required to share information about the secondary cell state of the secondary cell among the logical nodes of the base station.

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

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. However, 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.

For example, a convergence node may refer to a logical node hosting an RRC layer, an SDAP layer, and a PDCP layer. Alternatively, the CU means a logical node hosting the RRC, SDAP and PDCP protocols. Alternatively, 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).

Meanwhile, 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.

1 is a diagram illustrating a base station and a core network structure in a next generation radio access network.

Referring to FIG. 1, the NG-RAN means a next-generation radio access network and may be configured as an NR base station (gNB). In addition, the NG-RAN can be connected to a 5G core network (5GC). Alternatively, the gNB may be connected to the EPC, which is a 4G core network, if necessary.

For example, 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). In addition, 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).

In addition, 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.

Also, one DU supports one or more cells. For example, 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. As another example, 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.

In order for a base station to transmit and receive data by merging one or more carriers, 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.

However, 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 . Accordingly, although 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.

In order to solve this problem, 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.

In this specification, 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, . However, for convenience of description, the secondary cell may be configured to be in the active state at the time of CA configuration. For this purpose, 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.

On the other hand, the CU and DU in this specification can be physically co-located in the same place as logical nodes. Alternatively, 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. Alternatively, 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.

2 is a view for explaining the operation of a base station according to an embodiment.

Referring to FIG. 2, 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 ). To this end, 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.

Meanwhile, 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). For example, the convergence node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer, and 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.

Through this, 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).

For example, 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.

In one example, 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. In this case, 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.

In another example, 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. In this case, after step S220, the BS may periodically or aperiodically receive the measurement report information from the UE and perform step S230 using the measurement report information.

On the other hand, as described above, the secondary cell state of the secondary cell can be determined by the concentration node or the distributed node.

For example, 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. For example, 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. For example, 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.

As another example, 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. 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 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).

For example, the distributed node can transmit information on the secondary cell to be activated or deactivated to the terminal. As an example, the information indicating the secondary cell state may be transmitted to the terminal via the MAC Control Element (MAC CE). In another example, the information indicating the secondary cell state may be configured in a bitmap format and transmitted to the terminal. As another example, 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. As another example, 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.

As described above, 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. Alternatively, when the concentration node determines the secondary cell status for the secondary cell, 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.

As described above, 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. At this time, 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.

As described above, in the present specification, 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) . 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.

3 is a view for explaining the operation of a base station according to another embodiment.

Referring to FIG. 3, when the state of a specific secondary cell is configured or changed to be in an active state, the base station needs to recognize a change to an inactive state due to a timer expiration. However, as described above, in the NR, a concentrated node and a distributed node are separated from each other and information sharing about the state of the secondary cell is indispensably required. Since steps S210 to S240 are the same as those described with reference to FIG. 2, description thereof will be omitted in FIG.

After step S240, 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.

When the deactivation timer starts and ends or expires, the corresponding secondary cell can be changed to the deactivated state again. Thus, the concentration node needs to be aware of the timer expiration or state change to the inactive state of the secondary cell.

To this end, the distributed node can perform the step of transmitting secondary cell state information to the concentration node when the inactivation timer is terminated (S320). For example, 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. Alternatively, 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. For example, 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.

As described above, in the case where the base station is divided into the concentrated node and the distributed node, 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. In addition, the base station may also configure the secondary cell to be in the activated state even when instructing the merging of the carriers.

The operation of the terminal for the above-described operation will be described below with reference to the drawings.

4 is a diagram for explaining operations of a terminal according to an embodiment.

Referring to FIG. 4, 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). As described above, 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. When the measurement configuration information is received, 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.

In addition, 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. At this time, 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.

Then, 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 at least one secondary cell 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 >

For example, 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. As described above, the radio quality information may be information received from the concentration node by the distributed node. Alternatively, the radio quality information may be information directly decoded by the distributed node.

As another example, 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. In this case, the convergence node may transmit the determined secondary cell state information to the distributed node by constructing state information for each secondary cell.

On the other hand, the information indicating the secondary cell state can be transmitted through the MAC control element included in the distributed node. Alternatively, the information indicating the secondary cell state may be state information for each secondary cell that the concentration node delivers to the distributed node. Alternatively, 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. Or 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. Alternatively, 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.

As described above, 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.

Hereinafter, the operation of the base station and the terminal will be described in detail.

Each embodiment may be applied independently or in whole or in part.

First Embodiment: An embodiment in which the distribution node (DU) determines the activation state of the secondary cell

As described above, 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.

For example, if a MAC entity contained within DU is configured with more than one SCell, 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.

For example, 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. On the other hand, uplink measurement for a cell not associated with a UE can be utilized by DU. The DU can send a notification to the CU.

Hereinafter, an embodiment in which DU controls the secondary cell state operation of SCell will be described.

1-1. 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.

For this, 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.

1.2 How to receive and process radio quality information through the CU.

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.

For example, 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. Alternatively, 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.

In order to solve this unacknowledged problem, 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.

For example, 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 . For example, 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.

For another example, 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. When trying to transmit an RRC message that modifies / modifies the secondary cell configuration to the terminal through DU, the DU can send the wireless quality information via the F1AP message have. Alternatively, 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. 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 >

In addition, 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. Also, for example, 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. For another example, 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.

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.

As described above, 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.

Second Example : The concentration node determines the state of the secondary cell and distributes it to the distributed node. Example

The CU may configure or reconfigure or release one or more cells provided via DU. In addition, 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, such as cell identifiers (e.g., Cell ID, SCellindex), downlink / uplink transmission power control parameters, RACH parameters, etc., may be configured by the CU.

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.

Also, 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

For example, 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. In addition, state information for each secondary cell can be transmitted through a message on the F1AP. For example, the secondary cell-specific state information may be transmitted through a UE context management message (or UE context modification request message). Alternatively, the secondary cell-specific status information may be transmitted through a cell setup message (or UE context setup request message).

As another example, 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. For example, 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. For example, 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. For another example, 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.

As another example, 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. On the other hand, 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.

Referring to FIGS. 5 and 6, if less than or equal to 7 carriers are used for a corresponding terminal or a DU serving the terminal (for example, a certain subcell index / SCellindex 7), 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.

Alternatively, if more than seven (or more) carriers are used for the terminal or for the DU serving the terminal (e.g., if any subcell index / SCellindex is greater than 7) Information indicating the secondary cell state of each secondary cell transmitted by the CU to DU is applied with four octets as shown in FIG.

Here, the sub-cell index indicates a short identity used for identifying one serving cell. In addition, 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. As another example, even if there is no SCell configured with the subcell index / SCellindex i for the cell provided in the corresponding DU for the UE, 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.

More specifically, for example, 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.

On the other hand, 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.

Through this, 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.

On the other hand, when the state of the secondary cell configured in the terminal is changed to the active state or the inactive state according to the above-described embodiments, 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. However, in the NR, 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 procedure is described below.

DU to CU Secondary  How to pass activation / deactivation status information for a cell

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. However, in the case of the secondary cell, when the secondary cell ratio activation timer (sCellDeactivationTimer) expires, it can be known only from DU including the MAC entity.

Therefore, when the sCellDeactivationTimer associated with the SCell activated in this TTI expires, 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.

As an example, the secondary cell state information may be transmitted via a message on the F1AP.

As another example, 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. In this case, 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. For example, the activation / deactivation indication information may be set to 1 when the corresponding cell is activated and to 0 when it is deactivated. As another example, 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.

As another example, 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. Alternatively, 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.

Through this operation, 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.

On the other hand, an embodiment of carrier merging in which the above-described operation of determining and changing the secondary cell state is required will be described below. In particular, 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.

In the conventional dual connectivity technology, 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. On the other hand, the other secondary cells in the cells included in the secondary cell group are configured to be in a deactivated state. On the other hand, in the conventional CA technology, all non-PC cells are configured to be inactive.

If 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. Here, DU1 and DU2 are used to distinguish different DUs from each other, and the term is not limited.

In this case, 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

For a terminal that has established an RRC connection via DU1 and CU, the base station (or CU) 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.

If 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.

If one wishes to configure the CU to transmit user data simultaneously using one or more cells 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.

As described above, 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.

For example, the BS may configure the UE to be inactive for all cells of the DU2. In other words, in the conventional dual connectivity technology, 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.

As another example of this, 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.

As another example for providing this, 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.

As another example for this, 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.

As another example for this, 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

- How the CU directs activation / deactivation of cells associated with DU2 via 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.

As an example, 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.

As another example, 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 method in which 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

For example, 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.

In another example, DU2 (or DU1 MAC entity) 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.

For this purpose, 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.

For example, the receiving DU1 (or DU1 MAC entity) can instruct activation / deactivation of a particular cell of DU2 through the L2 signaling (MAC Control element).

In another example, 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. In another example, 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 >

- how DU2 directs activation / deactivation of cells associated with DU2 through DU1

DU2 (or DU2 MAC entity) may determine activation / deactivation for a particular cell in the DU2 cell group.

For example, if all cells provided through DU2 are deactivated, DU2 (or DU2 MAC entity) may instruct the terminal to activate for a particular cell in the DU2 cell group via DU1 (or DU1 MAC entity) .

For example, 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.

In another example, 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) .

As another example, a specific cell in the aforementioned DU2 cell group may be a special cell (e.g., PSCell providing PUCCH or PUCCH SCell). In another example, when DU1 receives information indicating activation / deactivation for a particular cell via the CU or via a direct interface between DUs, DU1 sends acknowledgment information (ACK / NACK).

Meanwhile, 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.

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).

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.

For example, the logical channel configuration information may include mapping information between a specific radio bearer and a logical channel ID.

In another example, 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 radio bearer identification information for the specific radio flow described above or for a specific PDU session or for a specific radio bearer (or E-RAB / core network bearer, or specific radio flow group) and the corresponding radio bearer identification information The logical channel identification information to be used in the MAC is determined by the CU.

In another example, 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. Accordingly, in step 2 (step 2), 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. In step 3, the CU can transmit this information to the terminal through DU1.

In another example, 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.

As another example, the CU (or CU-CP) 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, For example, Cell quality status information (for example, top / middle / bottom, active / good / excellent display information), information obtained by coding / abstraction of measurement results for each cell, quality / cell / frequency information (best measurement result cell information or more than best number measurement result cell information), best measurement result cell measurement result (rsrpResult, scale / code) (rsrpResult, rsrqResult, rs-sinr-Result, more than a certain number of best beam ID / best beam measurement results, NR SS measurement result, NR CSI -RS measurement result) and the radio quality information described above with respect to the secondary cell of the neighboring cell / other DU.

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.

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.

For example, DU2 may be configured to be a lower layer (or some information element that is created in the layer) by the CU and a specific radio bearer (or E-RAB / core network bearer, Group) < RTI ID = 0.0 > (e. ≪ / RTI >

In another example, the message that DU2 sends to the CU may include configuration information for random access to the DU2 cell. For example, 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.

As another example, 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.

As another example, admission control may not be needed in DU2. Or, even if admission control is required 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. Alternatively, 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.

For example, 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.

In another example, the CU may include configuration information for random access in its own managed DU2 cell in the RRC connection reconfiguration message. For example, 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.

As another example, 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.

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. When a CU (for example, CU1) is connected to another CU (for example, CU2) different from the corresponding CU through one DU to which each CU is connected, 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.

As another example, 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.

As described above, 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.

Hereinafter, a configuration of a base station and a terminal capable of performing all or a part of the above-described present disclosure will be described.

7 is a diagram illustrating a configuration of a base station according to an embodiment.

Referring to FIG. 7, 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.

Here, 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.

In addition, 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. In one example, 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.

On the other hand, as described above, the secondary cell state of the secondary cell can be determined by the concentration node or the distributed node.

For example, 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. For example, 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. For example, 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.

As another example, 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 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.

Also, the distributed node can transmit information about the secondary cell to be activated or deactivated to the terminal. In one example, information indicating the secondary cell state may be transmitted to the terminal via the MAC information element (MAC CE). In another example, the information indicating the secondary cell state may be configured in a bitmap format and transmitted to the terminal. As another example, 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.

As described above, 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. Alternatively, when the concentration node determines the secondary cell status for the secondary cell, 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 .

On the other hand, the control unit 710 may start the secondary cell deactivation timer for the secondary cell indicated as the activated state. When the inactivation timer expires, the distributed node can transmit the secondary cell state information to the concentration node.

In addition, the control unit 710 provides carrier merging in a next-generation radio access network of an upper layer functional separation structure necessary for performing the above-described embodiments, Lt; RTI ID = 0.0 > 700 < / RTI > In addition, the control unit 710 may control the operation of the concentration node and the distributed 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.

8 is a diagram illustrating a configuration of a terminal according to an embodiment.

Referring to FIG. 8, 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 A control unit 810 for configuring a carrier merging by setting at least one secondary cell constituted by a transmission unit 820 and a distributed node to an active state or a deactivated state and a case where at least one secondary cell is set to a deactivated state and carrier merging is configured And a receiving unit 830 for receiving information indicating the secondary cell status of each of the at least one secondary cell determined by the concentration node or the distribution node using the measurement report information and the information on the amount of downlink data.

As described above, 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. When the measurement configuration information is received, 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.

Then, 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.

For example, 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. As described above, the radio quality information may be information received from the concentration node by the distributed node. Alternatively, the radio quality information may be information directly decoded by the distributed node.

As another example, 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. In this case, the convergence node may transmit the determined secondary cell state information to the distributed node by constructing state information for each secondary cell.

On the other hand, the information indicating the secondary cell state can be transmitted through the MAC control element included in the distributed node. Alternatively, the information indicating the secondary cell state may be state information for each secondary cell that the concentration node delivers to the distributed node. Alternatively, 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. Or 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.

In addition, the 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.

The terms "system", "processor", "controller", "component", "module", "interface", "model", "unit", and the like described above generally refer to a computer-related entity hardware, a combination of hardware and software , Software, or software in execution. For example, 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. For example, 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.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (22)

A method for controlling a carrier merging of a terminal, the base station including a centralized node and at least one distributed node,
Receiving measurement report information for a cell from a terminal;
Determining, by the concentration node, a carrier merging configuration in the terminal using cells configured by one or more distributed nodes;
Determining a secondary cell state of each of the at least one secondary cell configured in the terminal by the concentration node or the distributed node using the measurement report information and the information on the amount of downlink data received from the core network entity; And
And transmitting, by the distributed node, information indicating a secondary cell state of the secondary cell to the terminal,
The concentration node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer, and the distributed node is a logical node that hosts the RLC layer, the MAC layer, and the PHY layer,
Wherein the centralized node and the one or more distributed nodes transmit and receive information via an F1 interface. The method according to claim 1,
Wherein the step of determining the secondary cell state comprises:
Wherein the distribution node determines a secondary cell state for the secondary cell based on information on the radio quality information and the amount of downlink data included in the measurement report information. 3. The method of claim 2,
The concentration node receives the measurement report information to configure the radio quality information,
Wherein the distributed node receives the radio quality information from the concentration node and determines a secondary cell state for the secondary cell. The method according to claim 1,
Wherein the step of determining the secondary cell state comprises:
And the concentration node determines the secondary cell status for the secondary cell based on the measurement report information and the information on the amount of the downlink data. 5. The method of claim 4,
The convergence node,
And when the secondary cell state for the secondary cell is determined, the state information for each secondary cell is transferred to the distributed node. 6. The method of claim 5,
The information indicating the secondary cell status may be,
Wherein the MAC control element signal is a MAC control element signal configured in a bitmap form based on the state information of each secondary cell. The method according to claim 1,
After transmitting the information indicating the secondary cell status to the terminal,
The distributed node comprises:
Further comprising the step of starting the secondary cell deactivation timer in the secondary cell indicated as active and delivering the secondary cell state information to the concentration node when the secondary cell deactivation timer expires. A method for performing a carrier merging by a terminal using a base station configured of one concentration node and one or more distributed nodes,
Transmitting measurement report information to a base station via a distributed node based on cell measurement configuration information;
Configuring carrier merging by setting at least one secondary cell of the distributed node to an active state or an inactive state; And
When the at least one secondary cell is set to the inactive state and the carrier merging is configured, the central node or the distributed node transmits the measurement report information and the secondary data for each of the at least one secondary cell determined using the information of the downlink data amount, And receiving information indicating a cell state,
The concentration node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer, and the distributed node is a logical node that hosts the RLC layer, the MAC layer, and the PHY layer,
Wherein the centralized node and the one or more distributed nodes transmit and receive information via an F1 interface. 9. The method of claim 8,
The information indicating the secondary cell status may be,
And secondary cell state 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 by the distribution node. 9. The method of claim 8,
The information indicating the secondary cell status may be,
And secondary cell state 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 by the concentration node. 11. The method of claim 10,
The information indicating the secondary cell status may be,
Wherein the distributed node is a MAC control element signal configured in a bitmap form based on state information for each secondary cell or state information for each secondary cell that the concentration node delivers to the distributed node. 1. A base station comprising a centralized node and at least one distributed node for controlling the merging of carriers in a terminal,
A receiving unit for receiving measurement report information on a cell from a terminal;
The convergence node determines a carrier merge configuration to the terminal using cells constituted by one or more distributed nodes,
A control unit for controlling the centralized node or the distributed node to determine a secondary cell state for each of at least one secondary cell configured in the terminal using the measurement report information and the information on the amount of downlink data received from the core network entity; And
And a transmitting unit for transmitting, by the distributed node, information indicating a secondary cell state of the secondary cell to the terminal,
The concentration node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer, and the distributed node is a logical node that hosts the RLC layer, the MAC layer, and the PHY layer,
Wherein the centralized node and the one or more distributed nodes transmit and receive information via an F1 interface. 13. The method of claim 12,
Wherein,
And the distribution node controls the secondary cell state for the secondary cell based on the information on the radio quality information and the amount of the downlink data included in the measurement report information. 14. The method of claim 13,
The concentration node receives the measurement report information to configure the radio quality information,
Wherein the distribution node receives the radio quality information from the concentration node and determines a secondary cell state for the secondary cell. 13. The method of claim 12,
Wherein,
And the concentration node determines the secondary cell state for the secondary cell based on the measurement report information and the information on the amount of the downlink data. 16. The method of claim 15,
The convergence node,
And when the secondary cell state for the secondary cell is determined, the state information for each secondary cell is transmitted to the distributed node. 17. The method of claim 16,
The information indicating the secondary cell status may be,
Wherein the MAC control element signal is a MAC control element signal configured in a bitmap form based on the state information of each secondary cell. 13. The method of claim 12,
The distributed node comprises:
Wherein the secondary cell deactivation timer starts a secondary cell deactivation timer in a secondary cell indicated as an active state and delivers secondary cell state information to the concentration node when the secondary cell deactivation timer ends. There is provided a terminal for performing a carrier merging using a base station including one central node and at least one distributed node,
A transmission unit for transmitting measurement report information to a base station through a distributed node based on cell measurement configuration information;
A control unit configured to configure a carrier merging by setting one or more secondary cells constituting the distributed node to an active state or an inactive state; And
When the at least one secondary cell is set to the inactive state and the carrier merging is configured, the central node or the distributed node transmits the measurement report information and the secondary data for each of the at least one secondary cell determined using the information of the downlink data amount, And a receiver for receiving information indicating a cell state,
The concentration node is a logical node that hosts the RRC layer, the SDAP layer, and the PDCP layer, and the distributed node is a logical node that hosts the RLC layer, the MAC layer, and the PHY layer,
Wherein the concentration node and the one or more distributed nodes transmit and receive information through an F1 interface. 20. The method of claim 19,
The information indicating the secondary cell status may be,
And secondary cell state 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 by the distribution node. 20. The method of claim 19,
The information indicating the secondary cell status may be,
And secondary cell state 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 by the concentration node. 22. The method of claim 21,
The information indicating the secondary cell status may be,
Wherein the distributed node is a MAC control element signal configured in a bitmap form based on state information for each secondary cell or state information for each secondary cell transmitted by the concentration node to the distributed node.

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