WO2019182287A1 - Procédé pour l'exécution d'une communication par un terminal, et appareil correspondant - Google Patents

Procédé pour l'exécution d'une communication par un terminal, et appareil correspondant Download PDF

Info

Publication number
WO2019182287A1
WO2019182287A1 PCT/KR2019/002955 KR2019002955W WO2019182287A1 WO 2019182287 A1 WO2019182287 A1 WO 2019182287A1 KR 2019002955 W KR2019002955 W KR 2019002955W WO 2019182287 A1 WO2019182287 A1 WO 2019182287A1
Authority
WO
WIPO (PCT)
Prior art keywords
drx
bwp
terminal
state
scell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2019/002955
Other languages
English (en)
Korean (ko)
Inventor
홍성표
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KT Corp
Original Assignee
KT Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020190027496A external-priority patent/KR20190111767A/ko
Application filed by KT Corp filed Critical KT Corp
Publication of WO2019182287A1 publication Critical patent/WO2019182287A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure discloses a technique for the terminal to efficiently communicate with the base station in various environments.
  • LTE Long Term Evolution
  • 5G Long Term Evolution-Advanced
  • 3GPP 3rd Generation Partnership Project
  • the NR (5G) technical standard for transmitting data at high speed through broadband is standardized, the importance of reducing power consumption of the terminal is further increased.
  • a change in a transmission / reception band, a bandwidth part (BWP), and a DRX configuration of the connection state terminal is required.
  • the dormant state is newly determined for power consumption and fast state transition of the terminal, and reducing power consumption of the dormant terminal is also an important requirement.
  • the secondary cell in the carrier aggregation situation may be changed to the dormant state, and when the change to the dormant state, a discussion on how to determine the BWP is also required.
  • the present disclosure proposes an efficient DRX application operation that can reduce power consumption of a terminal.
  • the present disclosure proposes a method for determining a BWP to be applied when the secondary cell transitions to a dormant state.
  • an embodiment of the present invention provides a method for a UE to perform a DRX (Discontinuous Reception) operation, receiving an RRC message including a plurality of DRX configurations from a base station and changing the DRX configuration from the base station.
  • Receiving a MAC control element (MAC CE) or L1 signaling indicating a and applying a DRX using a DRX configuration indicated by the MAC control element or L1 signaling of a plurality of DRX configuration receives a MAC control element (MAC CE) or L1 signaling indicating a and applying a DRX using a DRX configuration indicated by the MAC control element or L1 signaling of a plurality of DRX configuration .
  • MAC CE MAC control element
  • L1 signaling indicating a
  • an RRC message including one or more bandwidth parts (BWP) information for a secondary cell from a base station and CSI-RS configuration information associated with one or more BWPs
  • BWP bandwidth parts
  • a method includes determining a BWP of a secondary cell.
  • a method of controlling a DRX (Discontinuous Reception) operation of a terminal comprising: transmitting an RRC message including a plurality of DRX configurations to a terminal and a DRX configuration to be applied to the terminal among the plurality of DRX configurations; And determining a MAC control element (MAC CE) or L1 signaling for instructing a change of the DRX configuration to the terminal, wherein the terminal is a DRX indicated by the MAC control element or L1 signaling among a plurality of DRX configurations.
  • MAC CE MAC control element
  • L1 signaling for instructing a change of the DRX configuration to the terminal, wherein the terminal is a DRX indicated by the MAC control element or L1 signaling among a plurality of DRX configurations.
  • an RRC including one or more bandwidth parts (BWP) information for a secondary cell and one or more CSI-RS configuration information associated with one or more BWPs to a terminal Transmitting a message, determining to change the secondary cell state of the terminal from the active state to the dormant state (Dormant State), and transmitting a MAC control element for changing the state of the secondary cell from the active state to the dormant state to the terminal; Including the steps, the terminal changes the state of the secondary cell to the dormant state based on the MAC control element, and provides a method for determining the BWP of the secondary cell.
  • BWP bandwidth parts
  • a terminal performing a DRX operation may receive an RRC message including a plurality of DRX configurations from a base station and instruct a MAC CE to change a DRX configuration from the base station.
  • a receiver for receiving L1 signaling and a controller for applying DRX using a MAC control element or a DRX configuration indicated by L1 signaling among a plurality of DRX configurations may receive an RRC message including a plurality of DRX configurations from a base station and instruct a MAC CE to change a DRX configuration from the base station.
  • a receiver for receiving L1 signaling and a controller for applying DRX using a MAC control element or a DRX configuration indicated by L1 signaling among a plurality of DRX configurations may be received from the base station.
  • an embodiment is a terminal for changing the state of the secondary cell, from the base station receives the RRC message including one or more bandwidth parts (BWP) information for the secondary cell and CSI-RS configuration information associated with one or more BWP And change the state of the secondary cell to the dormant state based on the receiver and the MAC control element for receiving the MAC control element for changing the state of the secondary cell from the base station to the dormant state from the base station. It provides a terminal device including a control unit for determining the BWP.
  • BWP bandwidth parts
  • an embodiment is a base station for controlling the DRX (Discontinuous Reception) operation of the terminal, a transmitter for transmitting an RRC message including a plurality of DRX configuration to the terminal and determines a DRX configuration to be applied to the terminal among the plurality of DRX configuration
  • the control unit includes a control unit, wherein the transmitting unit transmits a MAC control element (MAC CE) or L1 signaling for instructing a change of the DRX configuration to the terminal, and the terminal transmits the DRX indicated by the MAC control element or L1 signaling among a plurality of DRX configurations.
  • MAC CE MAC control element
  • L1 signaling for instructing a change of the DRX configuration to the terminal
  • an embodiment is a base station for changing a state of a secondary cell of a terminal, to the terminal an RRC message including one or more bandwidth parts (BWP) information for the secondary cell and CSI-RS configuration information associated with one or more BWP
  • the terminal transmits a control element, and the terminal provides a base station apparatus for changing the state of the secondary cell to the dormant state based on the MAC control element, and determining the BWP of the secondary cell.
  • the present disclosure provides the effect of reducing power consumption by dynamically controlling the DRX configuration of the terminal.
  • the present disclosure provides an effect of allowing a fast state transition while reducing power consumption even when configuring a secondary cell.
  • FIG. 1 is a diagram schematically illustrating a structure of an NR wireless communication system to which an embodiment of the present invention may be applied.
  • FIG. 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
  • FIG. 5 is a diagram for describing a field of conventional DRX configuration information.
  • FIG. 6 is a diagram illustrating a DRX application operation of a terminal according to an embodiment.
  • FIG. 7 is a diagram for explaining an operation of applying a DRX of a terminal according to another embodiment.
  • FIG. 8 is a diagram for describing a DRX configuration included in an RRC message according to an embodiment.
  • FIG. 9 is a diagram for explaining a DRX configuration included in an RRC message according to another embodiment.
  • FIG. 10 is a diagram illustrating an operation of a base station for controlling a DRX operation of a terminal according to an embodiment.
  • FIG. 11 is a diagram illustrating a state change of a secondary cell, according to an exemplary embodiment.
  • FIG. 12 is a diagram for describing an operation of determining, by a terminal, a BWP of a secondary cell according to an embodiment.
  • FIG. 13 illustrates a MAC CE indicating a state change of a secondary cell, according to an exemplary embodiment.
  • FIG. 14 is a diagram for describing an operation of determining, by a base station, a BWP of a secondary cell according to an embodiment.
  • 15 is a diagram illustrating an example of a terminal configuration.
  • FIG. 16 illustrates a configuration of a base station according to an embodiment.
  • first, second, A, B, (a), and (b) may be used. These terms are only to distinguish the components from other components, and the terms are not limited in nature, order, order, or number of the components. If a component is described as being “connected”, “coupled” or “connected” to another component, that component may be directly connected to or connected to that other component, but between components It is to be understood that the elements may be “interposed” or each component may be “connected”, “coupled” or “connected” through other components.
  • the wireless communication system herein refers to a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station, and a core network.
  • the embodiments disclosed below may be applied to a wireless communication system using various wireless access technologies.
  • the embodiments of the present invention may include code division multiple access (CDMA), frequency division multiple access (FDMA), timedivision multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA).
  • CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • TDMA may be implemented in a wireless technology such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • OFDMA may be implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
  • IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
  • UTRA is part of a universal mobile telecommunications system (UMTS).
  • 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), employing OFDMA in downlink and SC- in uplink FDMA is adopted.
  • 3GPP 3rd generation partnership project
  • LTE long term evolution
  • E-UMTS evolved UMTS
  • E-UTRA evolved-UMTS terrestrial radio access
  • the embodiments may be applied to a wireless access technology that is currently disclosed or commercialized, and may be applied to a wireless access technology that is
  • the terminal in the present specification is a comprehensive concept of a device including a wireless communication module for communicating with a base station in a wireless communication system, and includes a UE in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio).
  • (User Equipment) should be interpreted as a concept that includes a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, and the like in GSM.
  • the terminal may be a user portable device such as a smart phone according to a usage form, and may mean a vehicle, a device including a wireless communication module in a vehicle, and the like in a V2X communication system.
  • a machine type communication (Machine Type Communication) system may mean an MTC terminal, an M2M terminal equipped with a communication module to perform machine type communication.
  • a base station or a cell of the present specification refers to an end point that communicates with a terminal in terms of a network, and includes a Node-B, an evolved Node-B, an eNB, a gNode-B, a Low Power Node, and an LPN. Sector, site, various types of antenna, base transceiver system (BTS), access point, access point (for example, transmission point, reception point, transmission point and reception point), relay node ), A mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a remote radio head (RRH), a radio unit (RU), and a small cell.
  • BTS base transceiver system
  • RRH remote radio head
  • RU radio unit
  • the base station may be interpreted in two meanings. 1) the device providing the mega cell, the macro cell, the micro cell, the pico cell, the femto cell, the small cell in relation to the wireless area, or 2) the wireless area itself. In 1) all devices that provide a given radio area are controlled by the same entity or interact with each other to cooperatively configure the radio area to the base station. According to the configuration of the wireless area, a point, a transmission point, a transmission point, a reception point, and the like become one embodiment of a base station. In 2), the base station may indicate the radio area itself that receives or transmits a signal from the viewpoint of the user terminal or the position of a neighboring base station.
  • a cell refers to a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • Uplink means a method for transmitting and receiving data to the base station by the terminal
  • downlink Downlink (Downlink, DL, or downlink) means a method for transmitting and receiving data to the terminal by the base station
  • the downlink may mean a communication or a communication path from a multiple transmission / reception point to a terminal
  • the uplink may mean a communication or communication path from a terminal to multiple transmission / reception points.
  • the transmitter in the downlink, the transmitter may be part of multiple transmission / reception points, and the receiver may be part of the terminal.
  • uplink a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • Uplink and downlink transmit and receive control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like.
  • Data is transmitted and received by configuring the same data channel.
  • a situation in which a signal is transmitted and received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is described as 'transmit and receive PUCCH, PUSCH, PDCCH, and PDSCH'. do.
  • 3GPP After researching 4G (4th-Generation) communication technology, 3GPP is conducting research on 5G (5th-Generation) communication technology to meet the requirements of ITU-R next generation wireless access technology. Specifically, 3GPP is conducting research on a new NR communication technology separate from LTE-A pro and 4G communication technology, in which LTE-Advanced technology is enhanced to meet the requirements of ITU-R as 5G communication technology.
  • LTE-A pro and NR both appear to be submitted in 5G communication technology, but for the convenience of description, the following describes the embodiments of the present invention mainly on NR.
  • Operational scenarios in NR defined various operational scenarios by adding considerations to satellites, automobiles, and new verticals in the existing 4G LTE scenarios.In terms of services, they have eMBB (Enhanced Mobile Broadband) scenarios and high terminal density. Supports a range of mass machine communication (MMTC) scenarios that require low data rates and asynchronous connections, and Ultra Reliability and Low Latency (URLLC) scenarios that require high responsiveness and reliability and support high-speed mobility. .
  • MMTC mass machine communication
  • URLLC Ultra Reliability and Low Latency
  • NR discloses a wireless communication system using a new waveform and frame structure technology, low latency technology, mmWave support technology, and forward compatible technology.
  • the NR system proposes various technological changes in terms of flexibility to provide forward compatibility. The main technical features will be described below with reference to the drawings.
  • FIG. 1 is a diagram schematically illustrating a structure of an NR system to which the present embodiment may be applied.
  • an NR system is divided into a 5G core network (5GC) and an NR-RAN part, and the NG-RAN controls a user plane (SDAP / PDCP / RLC / MAC / PHY) and a user equipment (UE). It consists of gNB and ng-eNBs providing a planar (RRC) protocol termination.
  • the gNB interconnects or gNBs and ng-eNBs are interconnected via an Xn interface.
  • gNB and ng-eNB are each connected to 5GC through the NG interface.
  • the 5GC may be configured to include an access and mobility management function (AMF) that is in charge of a control plane such as a terminal access and mobility control function, and a user plane function (UPF), which is in charge of a control function in user data.
  • AMF access and mobility management function
  • UPF user plane function
  • NR includes support for sub-6 GHz frequency bands (FR1, Frequency Range 1) and 6 GHz and higher frequency bands (FR2, Frequency Range 2).
  • gNB means a base station providing the NR user plane and control plane protocol termination to the terminal
  • ng-eNB means a base station providing the E-UTRA user plane and control plane protocol termination to the terminal.
  • the base station described in the present specification should be understood to mean gNB and ng-eNB, and may be used to mean gNB or ng-eNB.
  • a CP-OFDM waveform using a cyclic prefix is used for downlink transmission, and a CP-OFDM or DFT-s-OFDM is used for uplink transmission.
  • OFDM technology is easy to combine with Multiple Input Multiple Output (MIMO), and has the advantage of using a low complexity receiver with high frequency efficiency.
  • MIMO Multiple Input Multiple Output
  • the NR transmission neuron is determined based on sub-carrier spacing and cyclic prefix (CP), and is based on 15khz as shown in Table 1 below. The value is used as an exponent value of 2 and is changed exponentially.
  • CP sub-carrier spacing and cyclic prefix
  • the NR's pneumoroller may be classified into five types according to the subcarrier spacing. This is different from the fixed subcarrier spacing of LTE, which is one of 4G communication technologies, to be 15 kHz. Specifically, the subcarrier spacing used for data transmission in NR is 15, 30, 60, 120khz, and the subcarrier spacing used for synchronization signal transmission is 15, 30, 12, 240khz. In addition, the extended CP is applied only to the 60khz subcarrier interval.
  • the frame structure (frame) in NR is a frame having a length of 10ms consisting of 10 subframes having the same length of 1ms is defined.
  • One frame may be divided into half frames of 5 ms, and each half frame includes five subframes.
  • one subframe consists of one slot, and each slot consists of 14 OFDM symbols.
  • 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
  • the slot is fixedly configured with 14 OFDM symbols in the case of a normal CP, but the length of the slot may vary depending on the subcarrier spacing.
  • the slot in the case of a newerology with a 15khz subcarrier spacing, the slot has a length of 1 ms and the same length as the subframe.
  • the slot in the case of a numerology having a 30khz subcarrier spacing, the slot includes 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined with a fixed time length, the slot is defined by the number of symbols, the time length may vary according to the subcarrier interval.
  • NR defines a basic unit of scheduling as a slot, and also introduces a mini slot (or subslot or non-slot based schedule) to reduce transmission delay of a radio section.
  • the use of a wide subcarrier spacing shortens the length of one slot in inverse proportion, thereby reducing the transmission delay in the radio section.
  • the mini slot (or sub slot) is for efficient support for the URLLC scenario and can be scheduled in units of 2, 4, and 7 symbols.
  • NR defines uplink and downlink resource allocation at a symbol level in one slot.
  • a slot structure capable of transmitting HARQ ACK / NACK directly within a transmission slot has been defined, and this slot structure will be described as a self-contained structure.
  • NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in the Rel-15.
  • a combination of various slots supports a common frame structure constituting an FDD or TDD frame. For example, a slot structure in which all symbols of a slot are set to downlink, a slot structure in which all symbols are set to uplink, and a slot structure in which downlink symbol and uplink symbol are combined are supported.
  • NR also supports that data transmission is distributed and scheduled in one or more slots. Accordingly, the base station can inform the terminal whether the slot is a downlink slot, an uplink slot, or a flexible slot by using a slot format indicator (SFI).
  • SFI slot format indicator
  • the base station may indicate the slot format by using the SFI to indicate the index of the table configured through the RRC signaling to the terminal specific, and may be indicated dynamically through the downlink control information (DCI) or statically or quasi-statically through the RRC. It may be.
  • DCI downlink control information
  • the antenna port is defined such that the channel on which the symbol is carried on the antenna port can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of a channel carrying a symbol on one antenna port can be deduced from the channel carrying the symbol on another antenna port, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship.
  • the broad characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.
  • the Resource Grid since the Resource Grid supports a plurality of numerologies in the same carrier, a resource grid may exist according to each numerology.
  • the resource grid may exist according to the antenna port, subcarrier spacing, and transmission direction.
  • the resource block is composed of 12 subcarriers and is defined only in the frequency domain.
  • a resource element is composed of one OFDM symbol and one subcarrier. Accordingly, as shown in FIG. 3, one resource block may vary in size depending on the subcarrier spacing.
  • the NR defines "Point A" serving as a common reference point for the resource block grid, a common resource block, a virtual resource block, and the like.
  • FIG. 4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
  • the bandwidth part can be designated within the carrier bandwidth and used by the terminal.
  • the bandwidth part is associated with one neuralology and consists of a subset of consecutive common resource blocks and can be dynamically activated over time.
  • the UE is configured with up to four bandwidth parts, respectively, uplink and downlink, and data is transmitted and received using the bandwidth part activated at a given time.
  • uplink and downlink bandwidth parts are set independently, and in the case of unpaired spectrum, to prevent unnecessary frequency re-tunning between downlink and uplink operation.
  • the bandwidth parts of the downlink and the uplink are configured in pairs so as to share the center frequency.
  • Efficient power use is an important issue for mobile terminals.
  • the NR (5G) technical standard for transmitting data at high speed through broadband is standardized, the importance of reducing power consumption of the terminal is further increased.
  • the RRC connected state terminal a large part of the power consumption of the terminal occurs during the PDCCH monitoring process without the associated PDSCH.
  • more than 60% of the energy of the UE is consumed in PDCCH blind decoding having no scheduling grant in the RRC CONNECTED mode.
  • SCell control, carrier transmit / receive band, bandwidth part (BWP), and DRX configuration according to carrier aggregation have a great influence on power consumption of the RRC connected state terminal.
  • the UE performs a DRX operation by using a Discontinuous Reception (DRX) parameter.
  • the DRX operation may mean an operation of the UE intermittently performing PDCCH monitoring based on a value set by the DRX parameter.
  • the UE may perform a short term DRX and a long term DRX operation in an RRC connected state, and perform a paging DRX operation in an RRC idle state.
  • the present disclosure described below may be applied to some or all DRX operations performed by the terminal.
  • FIG. 5 is a diagram for describing a field of conventional DRX configuration information.
  • the terminal may receive DRX configuration information included in an RRC message.
  • DRX configuration information includes various field values related to DRX release and configuration.
  • the DRX configuration information may include various timer values for DRX setup, a parameter indicating a DRX type, and the like.
  • the MAC entity may configure the aforementioned DRX parameter for controlling PDCCH monitoring of the UE by RRC.
  • the MAC entity may discontinuously monitor the PDCCH using the DRX operation. Otherwise, the MAC entity must monitor the PDCCH continuously.
  • the following timer may be configured for the DRX operation of the UE.
  • drx-onDurationTimer the duration at the beginning of a DRX Cycle.
  • drx-onDurationTimer indicates the number of consecutive PDCCH subframes to be monitored by the UE at the start of the DRX cycle.
  • drx-SlotOffset indicates the delay in slots before starting the drx-onDurationTimer.
  • drx-InactivityTimer the duration after the PDCCH occasion in which a PDCCH indicates an initial UL or DL user data transmission for the PDCCH indicating an initial UL or DL user data transmission for a MAC entity MAC entity).
  • drx-InactivityTimer may indicate the number of consecutive PDCCH subframes after the corresponding subframe when the PDCCH indicates one initial UL or DL user data transmission;
  • drx-RetransmissionTimerDL (per DL HARQ process): the maximum duration until a DL retransmission is received.
  • drx-RetransmissionTimerDL may indicate the maximum number of consecutive PDCCH subframes until one DL retransmission is received;
  • drx-RetransmissionTimerUL (per UL HARQ process): the maximum duration until a grant for UL retransmission is received.
  • drx-RetransmissionTimerUL may indicate the maximum number of consecutive PDCCH subframes until one grant for UL retransmission is received;
  • drx-LongCycle indicates the Long DRX cycle.
  • drx-ShortCycle indicates a short DRX cycle.
  • drx-ShortCycleTimer the duration the UE shall follow the Short DRX cycle
  • drx-HARQ-RTT-TimerDL the minimum duration before a DL assignment for HARQ retransmission is expected by the MAC entity To indicate.
  • drx-HARQ-RTT-TimerUL indicates the minimum duration before a UL HARQ retransmission grant is expected by the MAC entity. .
  • the active time includes any one of the following cases.
  • drx-onDurationTimer or drx-InactivityTimer or drx-RetransmissionTimerDL or drx-RetransmissionTimerUL or ra-ContentionResolutionTimer is running;
  • a scheduling request is sent on PUCCH and is pending
  • a PDCCH indicating a new transmission addressed to the C after successfully receiving a random access response for a preamble not selected by the MAC entity (a PDCCH indicating a new transmission addressed to the C).
  • -RNTI of the MAC entity has not been received after successful reception of a Random Access Response for the preamble not selected by the MAC entity).
  • the MAC entity of the terminal should operate as follows.
  • the MAC entity starts the drx-RetransmissionTimerDL for the corresponding HARQ process.
  • the MAC entity starts the drx-RetransmissionTimerUL for the corresponding HARQ process.
  • the MAC object has drx-InactivityTimer Stop ( drx-InactivityTimer) .
  • MAC entity is started or restarted, the drx-ShortCycleTimer (start or restart drx -ShortCycleTimer);
  • the MAC entity uses the Short DRX Cycle.
  • 3> MAC entity uses the Long DRX cycle.
  • the MAC entity uses the Long DRX cycle.
  • the MAC entity uses the Long DRX cycle.
  • MAC entity discloses a drx-onDurationTimer after drx-SlotOffset (start drx-onDurationTimer after drx-SlotOffset).
  • the MAC entity starts drx-onDurationTimer (start drx-onDurationTimer ).
  • the MAC entity monitors the PDCC (monitor the PDCCH);
  • the MAC entity starts the drx-HARQ-RTT-TimerDL for the corresponding HARQ process immediately after the corresponding PUCCH transmission;
  • the MAC entity starts the drx-HARQ-RTT-TimerUL for the corresponding HARQ process immediately after the first repetition of the corresponding PUSCH transmission);
  • MAC entity does not report CQI / PMI / RI on PUCCH (not report CQI / PMI / RI on PUCCH).
  • the base station configures one DRX configuration information in the terminal, and the DRX operation was performed to perform a static operation according to one DRX configuration information. Accordingly, even when various data traffic characteristics, such as data arrival characteristics, are dynamically changed, the terminal may not process data transmission and reception in a power efficient manner.
  • the present disclosure describes various embodiments for providing a method and apparatus capable of power-efficiently controlling DRX operation of an NR wireless terminal.
  • each embodiment described herein may be applied to an NR terminal associated with an NR base station.
  • each embodiment may be applied to an LTE terminal linked to an LTE base station.
  • each embodiment may be applied to an LTE terminal connecting to an eLTE base station connected through a 5G system (or 5G Core Network).
  • each embodiment may be applied to an E-UTRAN NR Dual Connectivity (EN-DC) terminal or an NE-DC terminal that simultaneously provides LTE and NR wireless connections.
  • EN-DC E-UTRAN NR Dual Connectivity
  • FIG. 6 is a diagram illustrating a DRX application operation of a terminal according to an embodiment.
  • the terminal may perform a step of receiving an RRC message including a plurality of DRX configurations from a base station (S600).
  • the terminal receives an RRC message including a plurality of DRX configuration information.
  • Each of the plurality of DRX configuration information may include at least one of the aforementioned DRX parameters.
  • the DRX configuration information may include the aforementioned DRX parameters, and the plurality of DRX configuration information may include DRX parameters, respectively.
  • the DRX configuration information includes the aforementioned DRX parameters, DRX parameters common to the plurality of DRX configuration information are received as common DRX configuration information, and each DRX configuration information may include only values for different DRX parameters. have.
  • the RRC message may include DRX index information for distinguishing and indicating each of the plurality of DRX configurations.
  • DRX index information is allocated to each of the plurality of DRX configurations, and is used for identifying the DRX configuration.
  • the RRC message may be an RRC connection reconfiguration message.
  • the terminal may perform a step of receiving a MAC control element (MAC CE) or L1 signaling indicating a change in the DRX configuration from the base station (S610).
  • MAC CE MAC control element
  • a terminal that receives and stores a plurality of DRX configurations may receive a signal from the base station instructing to apply a specific DRX configuration.
  • the terminal since the terminal applies one DRX configuration, it is necessary to determine which DRX configuration among the DRX configurations received by the RRC message. To this end, the terminal may apply the DRX configuration indicated by the MAC CE received from the base station. Or, the terminal can apply the DRX configuration indicated by the L1 signaling received from the base station.
  • the MAC control element (MAC CE) or L1 signaling may include DRX index information for indicating a DRX configuration to be applied to the terminal among a plurality of DRX configurations.
  • the UE may check the DRX configuration mapped to the DRX index information indicated by MAC CE or L1 signaling.
  • the terminal may perform the step of applying DRX using the DRX configuration indicated by the MAC control element or the L1 signaling among the plurality of DRX configurations (S620). For example, the terminal checks the DRX configuration indicated by the base station among the plurality of DRX configurations described above, and performs a DRX operation by using the DRX parameter of the indicated DRX configuration. If the DRX configuration is set to a separate DRX configuration divided by a common DRX configuration and a DRX index, the terminal applies the DRX parameter of the common DRX configuration and performs a DRX operation by combining the indicated DRX parameters of the individual DRX configuration. do.
  • the terminal may dynamically change the DRX configuration according to the instruction of the base station to perform a more efficient DRX operation.
  • the dynamic DRX configuration change it is possible to minimize the power consumption of the terminal. For example, when there is no data to be transmitted to the terminal, or when the transmission timing of the data to be transmitted to the terminal is pushed back, the base station may adjust the DRX configuration of the terminal to prevent unnecessary power consumption of the terminal.
  • Various data prediction techniques may be applied to the prediction of the base station.
  • the base station dynamically changes the DRX configuration of the terminal, and may not actively reflect the necessity of the terminal. To this end, as described with reference to FIG. 7 below, the request of the terminal may be reflected.
  • FIG. 7 is a diagram for explaining an operation of applying a DRX of a terminal according to another embodiment.
  • the terminal may store a plurality of DRX configurations allocated to the terminal by performing an operation S600 of receiving an RRC message. If necessary, the terminal may instruct the base station of a specific DRX configuration selected by the terminal among the plurality of stored DRX configurations (S700).
  • the terminal may transmit the DRX index information that the terminal prefers or expects to apply to the base station at any time.
  • the terminal may transmit priority information set by the terminal for a plurality of DRX configurations to the base station.
  • the terminal may transmit the priority information to the base station through the order or priority information mapping of the DRX indexes allocated to the plurality of DRX configurations.
  • the terminal may select two or more DRX configurations that the terminal prefers or expects to apply among the plurality of DRX configurations, and transmit the DRX index information of the selected DRX configuration to the base station.
  • the terminal may perform one DRX operation by identifying one DRX configuration to be configured in the terminal through steps S610 and S620 described above.
  • step S700 has been described as being performed between steps S600 and S610, this has been described as an example, and the viewpoint may be variously applied.
  • the terminal may select one of the plurality of DRX configurations and perform a DRX operation.
  • the DRX configuration to be applied to the terminal for more efficient DRX operation may be indicated by a separate signal by the base station.
  • the terminal may transmit information indicating a specific DRX configuration to the base station.
  • the base station may configure one or more DRX configuration information having different DRX parameter values in the RRC Connected UE through an RRC message (eg, an RRC connection reconfiguration message).
  • an RRC message eg, an RRC connection reconfiguration message
  • the one or more DRX configuration information may be set to include a DRX index (or ID / identifier / number / delimiter such as ID, identifier / number / delimiter, etc.) for identifying / identifying the corresponding DRX configuration information.
  • a DRX index or ID / identifier / number / delimiter such as ID, identifier / number / delimiter, etc.
  • FIG. 8 is a diagram for describing a DRX configuration included in an RRC message according to an embodiment.
  • one or more different DRX configuration information included in an RRC message may be indicated through SEQUENCE ⁇ .
  • different DRX configuration information may be distinguished / identified through a DRX index (eg, drx-configId).
  • the base station configures one or more DRX configuration information in the terminal, it may be instructed to distinguish the DRX configuration through the aforementioned DRX index (eg, drx-configId).
  • one or more different DRX configuration information included in the RRC message may be indicated through a DRX configuration list (DRX-ConfigList :: SEQUENCE ⁇ SIZE (1..maxDRX-config) of DRX-config).
  • different DRX configuration information may be distinguished / identified through DRX-Config ID / Index / Identifier / Number / Delimiter (for example, drx-configId).
  • a value of 1 represents the first entry
  • a value of 2 represents the second entry
  • subsequent order values indicate the entry in the same manner.
  • value 0 may indicate the first entry
  • value 1 may indicate the second entry
  • subsequent order values may indicate the corresponding entry in the same manner.
  • the DRX configuration information includes drx-onDurationTimer, drx-SlotOffset, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, drx-LongCycle, drx-ShortCycle, drx-ShortCycleTimer, drx-HARQ-RTT-TimeHDL It may include one or more information elements of -RTT-TimerUL.
  • different DRX configuration information may be configured such that one or more information elements described above have different values.
  • the base station may allocate a DRX index (eg, drx-configId) to a preset specific value (eg, a minimum value, 0, or a maximum value) to indicate a DRX configuration not applied to a specific terminal. That is, the base station transmits the DRX configuration to each terminal through an RRC message, but may use a value of the DRX index to distinguish the DRX configuration to be allocated to each terminal.
  • the terminal may receive a plurality of DRX configurations and store the DRX configuration except for a DRX configuration having a predetermined specific value among the plurality of DRX configurations. Or, the terminal does not expect the DRX configuration having a predetermined value to be applied to the terminal.
  • a DRX index eg, drx-configId
  • a preset specific value eg, a minimum value, 0, or a maximum value
  • the base station may indicate a separate information element for indicating a DRX configuration to be used as a default to the terminal through an RRC signaling message (eg, an RRC connection reconfiguration message). That is, the terminal may perform the DRX operation by applying the default DRX configuration when the terminal does not receive a signal indicating the application of the specific DRX configuration from the base station.
  • an RRC signaling message eg, an RRC connection reconfiguration message
  • the UE may use a DRX configuration having a DRX index (eg, drx-configId) of a predetermined value (for example, minimum value, 0, first entry or maximum value) set in advance as the default DRX configuration. That is, the terminal may perform a DRX operation according to a DRX configuration having a preset DRX index of a specific value until receiving a signal indicating a separate DRX index.
  • a DRX index eg, drx-configId
  • a predetermined value for example, minimum value, 0, first entry or maximum value
  • the UE may apply the indicated DRX configuration according to the indication information included in the corresponding RRC message. That is, the RRC message does not indicate a default DRX configuration, but may include information for indicating a DRX configuration to be applied to the terminal when a plurality of DRX configurations are included.
  • the terminal when the terminal receives an RRC message including one or more DRX configurations, the terminal stores / applies the corresponding DRX configuration to the terminal but does not perform the DRX operation by using the same.
  • the terminal receives a command (for example, MAC CE or PDCCH or any L1 signal based on sequence) indicating activation / operation / on / switching of the DRX configuration stored or applied from the base station, the terminal receives the DRX configuration indicated by the command. Accordingly, the DRX operation may be performed.
  • a command for example, MAC CE or PDCCH or any L1 signal based on sequence
  • one terminal or one MAC entity may perform a DRX operation by applying only one DRX configuration at a given time (or at a specific time point).
  • the DRX configuration information may be configured with specific values for one or more information elements suitable for a specific traffic arrival type, for example, DL dedicated traffic or UL dedicated traffic.
  • the DRX configuration information may indicate a DRX configuration suitable for a specific traffic arrival type (eg, DL-only traffic or UL-only traffic) through a DRX index (eg, drx-configId). That is, the traffic arrival type mapped for each DRX index may be preset and stored in the base station and the terminal.
  • a specific traffic arrival type eg, DL-only traffic or UL-only traffic
  • a DRX index eg, drx-configId
  • the amount of data included in the RRC reconfiguration message may be increased as compared to the conventional DRX configuration indicating only one DRX configuration.
  • information elements that can be used in common for each DRX configuration among a plurality of DRX configuration information can be transmitted only once by dividing them into common DRX parameters.
  • FIG. 9 is a diagram for explaining a DRX configuration included in an RRC message according to another embodiment.
  • the DRX configuration information included in the RRC message may be divided into common DRX configuration information and specific DRX configuration information.
  • the common DRX configuration information may include a DRX parameter that is commonly applied to all DRX configuration information.
  • Specific DRX configuration information may include DRX parameters having different values.
  • the MAC cell group configuration information (MAC-CellGroupConfig) included in the RRC connection reconfiguration message or the RRC connection reconfiguration message may be the common DRX configuration information (for example, CommonDrx-Config) that is commonly included in one or more DRX configuration information. It may include a DRX parameter / DRX information element / DRX timer.
  • common DRX configuration information (for example, CommonDrx-Config) commonly included in one or more DRX configuration information may include drx-onDurationTimer, drx-SlotOffset, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, drx-LongCycle, It may include at least one information element of drx-ShortCycle, drx-ShortCycleTimer, drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerUL.
  • a specific DRX configuration having a specific DRX index may be configured without including commonly included information elements. Can be. Accordingly, the UE may perform the DRX operation using both the common DRX configuration and the specific DRX configuration.
  • the DRX configuration information is drx-onDurationTimer, drx-SlotOffset, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, drx-LongCycle, drx-ShortCycle, drx-ShortCycleTimer, drx-HARQ-RTT-TimerDL
  • One or more information elements of HARQ-RTT-TimerUL may be indicated through SEQUENCE ⁇ or subDRX-ConfigList :: SEQUENCE ⁇ SIZE (1..maxDRX-config) of subDRX-config.
  • different subDRX configuration information can be distinguished / identified through DRX-Config ID / Index / Identifier / Number / Delimiter (eg drx-configId).
  • a specific DRX configuration having a specific DRX index (eg, drx-configId) includes an information element commonly included and configured May be
  • the terminal may perform a DRX operation using only information elements included in specific DRX configuration information. That is, when the terminal applies the specific DRX configuration information to the terminal to perform the DRX operation, the DRX operation may be performed by applying only the specific DRX configuration information without using the common DRX configuration information.
  • the base station may instruct switching between the DRX configuration (or specific DRX parameter configuration) of the terminal based on an explicit command by the base station.
  • the switching indication between DRX configurations may be provided through a MAC CE.
  • the base station may switch the DRX configuration applied to the terminal by indicating the MAC CE including the aforementioned DRX index (eg, drx-configId) to the terminal. It may be provided with a MAC CE format different from DRX Command or Long DRX Command and / or with a different LCID value.
  • the DRX Command was identified via LCID 111100 and had a fixed size of zero bits.
  • Long DRX Commands were identified via LCID 111011 and had a fixed size of zero bits.
  • the MAC CE for switching of the DRX configuration may be identified by being assigned an LCID value different from that of the DRX Command and the Long DRX Command.
  • the MAC CE different from the DRX Command or Long DRX Command may include one or more information elements included in the DRX configuration information such as a drx-InactivityTimer.
  • the terminal When the terminal receives the MAC CE indicating DRX configuration switching from the base station, it can immediately change the DRX configuration. For example, if the on-duration timer is included in the indicated DRX configuration, the terminal stops the drx-onDurationTimer. Or, the terminal restarts the onduration timer of the indicated DRX configuration. Alternatively, the terminal starts the onduration timer by switching the drx-onDurationTimer to the onduration timer value of the indicated DRX configuration.
  • the UE performs a DRX operation using an onduration timer of the DRX configuration indicated in the next DRX cycle.
  • information indicating DRX configuration switching may be delivered through a PDCCH or an arbitrary L1 signal based on a sequence.
  • the base station may switch the DRX configuration by instructing the terminal by including DRX index (eg, drx-configId) information indicating a DRX configuration to be changed in the DCI.
  • DRX index eg, drx-configId
  • the base station may switch the DRX configuration by instructing the terminal to distinguish the DRX index (for example, drx-configId) indicating the DRX configuration to be changed through any L1 signal divided into sequences.
  • the L1 signal can distinguish the DRX index through a different sequence, and one of configuration information (for example, time, frequency information, transmission period, start time, offset from the start of the duration timer) to indicate this.
  • the above information may be indicated to the terminal through an RRC message.
  • the corresponding L1 signal can distinguish the operation of any information element included in the DRX configuration information through a different sequence, and configuration information (for example, time, frequency information, transmission cycle, start, etc.) for indicating this Time, offset from the start of the duration timer, indicating information element, information of one or more of the corresponding operation) may be indicated to the terminal through an RRC message.
  • configuration information for example, time, frequency information, transmission cycle, start, etc.
  • the terminal When the terminal receives the L1 signaling indicating the switching of the DRX configuration from the base station, it can immediately change the DRX configuration. For example, the terminal stops drx-onDurationTimer if the on-duration timer is included in the indicated DRX configuration or if the indicated L1 signaling is for changing the on-duration timer on the DRX configuration. Or, the terminal restarts the onduration timer of the indicated DRX configuration. Alternatively, the terminal starts the onduration timer by switching to the onduration timer value of the indicated DRX configuration. In contrast, the UE performs a DRX operation using an onduration timer of the DRX configuration indicated in the next DRX cycle.
  • the terminal stops drx-InactivityTimer if the drx-Inactivity timer is included in the indicated DRX configuration or if the indicated L1 signaling is for changing the drx-Inactivity timer on the DRX configuration.
  • the terminal restarts the drx-InactivityTimer of the indicated DRX configuration.
  • the terminal switches to the drx-InactivityTimer value of the indicated DRX configuration to start the drx-InactivityTimer.
  • the UE performs a DRX operation using a drx-InactivityTimer of a DRX configuration indicated in the next DRX cycle.
  • FIG. 10 is a diagram illustrating an operation of a base station for controlling a DRX operation of a terminal according to an embodiment.
  • the base station may perform a step of transmitting an RRC message including a plurality of DRX configurations to the terminal (S1000).
  • the RRC message may include DRX index information for distinguishing and indicating each of the plurality of DRX configurations.
  • the RRC message may be an RRC connection reconfiguration message.
  • the plurality of DRX configurations may be divided into a common DRX configuration including DRX parameters commonly applied to each DRX configuration and a dedicated DRX configuration including DRX parameters having different values set for individual DRX configurations.
  • the base station may perform a step of determining a DRX configuration to be applied to the terminal of the plurality of DRX configuration, and transmits a MAC control element (MAC CE) or L1 signaling for instructing the change of the DRX configuration to the terminal ( S1020).
  • the MAC control element or L1 signaling may include DRX index information for indicating a DRX configuration to be applied to the terminal among the plurality of DRX configurations.
  • the L1 signaling may be any L1 signal based on DCI or sequence of the PDCCH.
  • the base station may determine the DRX configuration to be applied to the terminal in consideration of the data traffic arrival type. Alternatively, the base station may determine the DRX configuration to be applied to the terminal in consideration of the preferred DRX configuration of the terminal transmitted by the terminal in step S1010.
  • the base station may further perform a step of receiving DRX index information indicating a specific DRX configuration selected by the terminal among the plurality of DRX configurations from the terminal (S1010). Step S1010 may be omitted.
  • the terminal applies DRX using a DRX configuration indicated by MAC control element or L1 signaling among a plurality of DRX configurations.
  • the terminal checks the DRX configuration indicated by the base station among the plurality of DRX configurations described above, and performs a DRX operation by using the DRX parameter of the indicated DRX configuration. If the DRX configuration is set to a separate DRX configuration divided by a common DRX configuration and a DRX index, the terminal applies the DRX parameter of the common DRX configuration and performs a DRX operation by combining the indicated DRX parameters of the individual DRX configuration. do.
  • the terminal may dynamically change the DRX configuration according to the instruction of the base station to perform a more efficient DRX operation.
  • the dynamic DRX configuration change it is possible to minimize the power consumption of the terminal. For example, when there is no data to be transmitted to the terminal, or when the transmission timing of the data to be transmitted to the terminal is pushed back, the base station may adjust the DRX configuration of the terminal to prevent unnecessary power consumption of the terminal.
  • Various data prediction techniques may be applied to the prediction of the base station.
  • one or more DRX configuration information having different DRX parameter values may be configured in the terminal, and dynamic control thereof may reduce power consumption of the terminal.
  • CA Carrier Aggregation
  • the base station instructs the measurement configuration for the frequency of the candidate cell likely to be configured as a secondary cell before configuring the CA for the RRC connected state terminal.
  • the base station transmits the measurement reporting to the base station according to the reporting configuration, the base station further configures a secondary cell in the terminal based on the received measurement report.
  • the SCell is configured, the SCell is configured in a deactivated state.
  • the base station may activate the secondary cell in consideration of another measurement reporting result for the SCell, the amount of transmission / reception data, and the like to use the user data transmission.
  • the secondary cell If the secondary cell is deactivated, it does not transmit SRS to the secondary cell (not transmit SRS on the SCell) and does not transmit on the secondary cell's UL-SCH (not transmit on UL-SCH on the SCell). Not transmit on RACH on the SCell, channel quality indicator (CQI) / precoding matrix indicator (PMI) / rank indicator (RI) / procedure transaction identifier (PTI) / CRI (for secondary cell) PDCCH monitoring for secondary cells without performing CSI-RS Resource Indicators (not report CQI / PMI / RI / PTI for the SCell) and without monitoring on secondary cells (not monitor the PDCCH on the SCell) (Not monitor the PDCCH for the SCell)
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indicator
  • PTI procedure transaction identifier
  • CRI for secondary cell
  • PDCCH monitoring for secondary cells without performing CSI-RS Resource Indicators not report CQI / PMI /
  • MAC CE control element
  • the terminal when the terminal receives the MAC CE for activating the SCell in subframe n, the terminal should be able to apply / complete the SCell activation operation up to n + 24 or n + 34 subframes.
  • the timing associated with this may be set as follows.
  • the corresponding actions are greater than the minimum requirements defined in 3GPP TS 36.133 except for the following to be applied to subframe n + 8. It should be applied not later and faster than subframe n + 8. (When a UE receives an activation command for a secondary cell in subframe n, the corresponding actions in [36.321] shall be applied no later than the minimum requirement defined in [36.133] and no earlier than subframe n + 8, except for the following :)
  • the terminal should be able to apply the operation not later than subframe n + 34.
  • the UE Upon receiving SCell activation command in subframe n, the UE shall be capable to transmit valid CSI report and apply actions related to the activation command as specified for the SCell being activated no later than in subframe n + 24 provided the following conditions are met for the SCell:
  • the SCell being activated remains detectable according to the cell identification conditions specified in section 8.3.3.2,
  • the UE shall be capable to transmit valid CSI report and apply actions related to the activation command for the SCell being activated no later than in subframe n + 34 provided the SCell can be successfully detected on the first attempt.
  • the UE When the deactivated SCell is activated, the UE performs RF retuning, initial CQI measurement, and CQI reporting.
  • a method for quickly turning the SCell into an active state a method of reducing the initial valid CQI estimation and reporting time may be considered. This method may be provided by measuring or reporting periodic CQI for the SCell in which the UE is configured. However, this has a problem of inducing power consumption because periodic CQI needs to be measured or reported.
  • the SCell can be quickly switched to the active state to transmit data.
  • defining a new state in the SCell can require complex actions, such as transitioning between a new SCell state and an existing active state, and a transition between a new SCell state and an existing inactive state.
  • the new SCell state could not support bandwidth part (BWP) operations that can transmit and receive data by efficiently adjusting the bandwidth of the cell. Accordingly, data transmission that optimizes power consumption of the SCell has been difficult.
  • BWP represents a subset of the total cell bandwidth of a cell and is used for bandwidth adaptation in NR. Through bandwidth adjustment, the reception and transmission bandwidth of the terminal does not need as much as the bandwidth of the cell and can be adjusted. The width can be commanded to change.
  • the receive and transmit bandwidth of a UE need not be as large as the bandwidth of the cell and can be adjusted: the width can be ordered to change (eg to shrink during period of low activity to save power); the location can move in the frequency domain (eg to increase scheduling flexibility); and the subcarrier spacing can be ordered to change (eg to allow different services) .
  • a subset of the total cell bandwidth of a cell is referred to as a Bandwidth Part (BWP) and BA is achieved by configuring the UE with BWP (s) and telling the UE which of the configured BWPs is currently the active one.
  • the conventional CA technology does not support the detailed technology for the SCell state to support fast SCell usage and / or power consumption reduction.
  • the BWP operation that can transmit and receive data by efficiently adjusting the bandwidth of the cell in this state was not supported. Accordingly, when the terminal supports a cell state supporting fast SCell transition, data transmission optimizing power consumption of the SCell has been difficult.
  • the present disclosure is to provide a method for effectively controlling a BWP operation capable of transmitting and receiving data by efficiently adjusting a bandwidth of a cell in an SCell state in which a terminal supports fast SCell use and / or power consumption reduction.
  • the terminal can apply the procedure described below to both the MCG (Master Cell Group) and SCG. (If the UE is configured with a SCG, the UE shall apply the procedures described in this clause for both MCG and SCG
  • the terms 'secondary cell', 'secondary cells', 'serving cell', 'serving cells' in this clause refer to secondary cell, secondary cells, serving cell, serving cells belonging to the MCG respectively.
  • the terms 'secondary cell', 'secondary cells', 'serving cell', 'serving cells' in this clause refer to secondary cell, secondary cells (not including PSCell), serving cell, serving cells belonging to the SCG respectively.
  • the term 'primary cell' in this clause refers to the PSCell of the SCG.
  • a UE configured for a BWP operation of one serving cell may be configured with at most four downlink BWPs and four uplink BWPs in the serving cell by a higher layer (RRC).
  • RRC higher layer
  • a UE configured for operation in bandwidth parts (BWPs) of a serving cell is configured by higher layers for the serving cell a set of at most four bandwidth parts (BWPs) for receptions by the UE (DL BWP set) in a DL bandwidth by parameter DL-BWP and a set of at most four BWPs for transmissions by the UE (UL BWP set) in an UL bandwidth by parameter UL-BWP for the serving cell.)
  • the initial active downlink BWP is indicated by the position and number of consecutive PRBs, subcarrier spacing and cyclic prefix, for the control resource set for the Type0-PDCCH common search space.
  • An initial active DL BWP is defined by a location and number of contiguous PRBs, a subcarrier spacing, and a cyclic prefix, for the control resource set for Type0-PDCCH common search space.
  • the terminal For operation on the primary cell, the terminal is provided with an initial uplink BWP for the random access procedure by higher layer parameters.
  • a UE For operation on the primary cell, a UE is provided by higher layer parameter initial-UL-BWP an initial UL BWP for a random access procedure.
  • the terminal may be configured with an initial BWP for a random access procedure on the secondary carrier. (If the UE is configured with a secondary carrier on the primary cell, the UE can be configured with an initial BWP for random access procedure on the secondary carrier.)
  • the UE may expect that the center frequency for the DL BWP is the same for the UL BWP. (For unpaired spectrum operation, a UE can expect that the center frequency for a DL BWP is same as the center frequency for a UL BWP.)
  • the terminal For each DL BWP or UL BWP, the terminal is configured with the following parameters for its serving cell.
  • the UE For each DL BWP or UL BWP in a set of DL BWPs or UL BWPs, respectively, the UE is configured the following parameters for the serving cell as defined in [4, TS 38.211] or [6, TS 38.214]:
  • the index in the set of DL BWPs or UL BWPs by respective higher layer parameter DL-BWP-index or UL-BWP-index for paired spectral operation, or the link ratio between DL BWP and UL BWP from the configured DL set An index in the set of DL BWPs or UL BWPs by respective higher layer parameters DL-BWP-index or UL-BWP-index for paired spectrum operation, or a link between a DL BWP and an UL BWP from the set of configured DL BWPs and UL BWPs by higher layer parameter BWP-pair-index for unpaired spectrum operation);
  • DCI 1_0 or DCI 1_1 detection for PDSCH reception timing by higher layer parameter DL-data-time-domain PDSCH reception for HARQ-ACK transmission timing value by higher layer parameter DL-data-DL-acknowdedgement, and DCI higher DCI 0_0 or DCI 0_1 detection to a PDSCH reception timing by higher layer parameter DL-data-time-domain, a PDSCH reception to a HARQ-ACK transmission timing value by higher layer parameter DL-data-DL-acknowledgement, a DCI 0_0 or DCI 0_1 detection to a PUSCH transmission timing value by higher layer parameter UL-data-time-domain);
  • the first PRB of the bandwidth is for the downlink of the primary cell, the first PRB of the bandwidth is of the SS / PBCH block used by the UE for initial cell selection. the first RPB of the SS / PBCH block used by the UE for initial cell selection);
  • the first PRB of the bandwidth is the first PRB of the UL bandwidth indicated by SystemInformationBlockType1
  • the first PRB of the bandwidth is the first PRB of the UL bandwidth indicated by System Information BlockType 1
  • the first PRB of the bandwidth is for the uplink of the primary cell for unpaired, the first of the SS / PBCH block used by the UE for initial cell selection.
  • PRB of the bandwidth is the first PRB of the SS / PBCH block used by the UE for initial cell selection);
  • the first PRB of the DL bandwidth or the UL bandwidth is indicated to the UE by the higher layer configuration for the secondary cell or carrier (For a secondary cell or carrier, the first PRB of the DL bandwidth or of the UL bandwidth is indicated to the UE by the higher layer configuration for the secondary cell or carrier)
  • the terminal may be configured with a control resource set for all types of common search spaces and terminal specific search spaces.
  • a UE can be configured control resource sets for every type of common search space and for UE-specific search space. The UE is not expected to be configured without a common search space on the PCell, or on the PSCell, in the active DL BWP.
  • the terminal may be configured with a resource set for PUCCH transmission. (For each UL BWP in a set of UL BWPs, the UE is configured resource sets for PUCCH transmissions)
  • the terminal receives the PDCCH and the PDSCH in the DL BWP according to the subcarrier spacing and the CP length configured for the DL BWP.
  • a UE receives PDCCH and PDSCH in a DL BWP according to a configured subcarrier spacing and CP length for the DL BWP.
  • a UE transmits PUCCH and PUSCH in an UL BWP according to a configured subcarrier spacing and CP length for the UL BWP.
  • the BWP indicator field value indicates an active DL BWP from the configured DL BWP set. If the BWP indicator field is configured in DCI format 0_1, the BWP indicator field value indicates an active UL BWP from the configured UL BWP set. (If a bandwidth path indicator field is configured in DCI format 1_1, the bandwidth path indicator field value indicates the active DL BWP, from the configured DL BWP set, for DL receptions. If a bandwidth path indicator field is configured in DCI format 0_1, the bandwidth path indicator field value indicates the active UL BWP, from the configured UL BWP set, for UL transmissions.)
  • the UE may configure a default DL BWP by higher layer parameters. If the terminal is not provided with a default downlink BWP by the upper layer, the default BWP is the initial active downlink BWP. (For the primary cell, a UE can be provided by higher layer parameter Default-DL-BWP a default DL BWP among the configured DL BWPs. (If a UE is not provided a default DL BWP by higher layer parameter Default-DL-BWP , the default BWP is the initial active DL BWP.)
  • the UE may receive a BWP activity timer value for the primary cell by higher layer parameters. And at every time the terminal detects DCI format 1_1 indicating an active DL BWP, which is not the default DL BWP for paired spectrum operation, or an active DL BWP, which is not the default DL BWP or UL BWP for unpaired spectrum operation, or The timer is started every time a DCI format 1_1 or DCI format 0_1 indicating the UL BWP is detected. When the timer expires, the terminal switches from the active DL BWP to the default DL BWP.
  • a UE can be provide by higher layer parameter BWP-InactivityTimer a timer value for the primary cell, as described in [11, TS 38.321] and then the UE starts the timer each time the UE detects a DCI format 1_1 indicating an active DL BWP, other than the default DL BWP, for paired spectrum operation or each time the UE detects DCI format 1_1 or DCI format 0_1 indicating an active DL BWP or UL BWP, other than the default DL BWP or UL BWP, for unpaired spectrum operation.
  • the UE increments the timer every interval of 1 millisecond for carrier frequencies smaller than or equal to 6 GHz or every interval of 0.5 milliseconds for carrier frequencies larger than 6 GHz if the UE does not detect any DCI format 1_1 for paired spectrum operation or if the UE does not detect any DCI format 1_1 or DCI format 0_1 for unpaired spectrum operation during the interval.
  • the timer expires when the timer is equal to the BWP-InactivityTimer value.
  • the UE switches to the default DL BWP from an active DL BWP w hen the timer expires.
  • the terminal is configured with the default DL BWP for the secondary cell by the upper layer parameter, and if the terminal is configured with the BWP activity timer value by the higher layer parameter, the terminal is the procedure on the secondary cell is the corresponding timer value and default DL Same as on primary cell using BWP.
  • a UE is configured for a secondary cell with higher layer parameter Default-DL-BWP indicating a default DL BWP among the configured DL BWPs and the UE is configured with higher layer parameter BWP-InactivityTimer indicating a timer value
  • the UE procedures on the secondary cell are same as on the primary cell using the timer value for the secondary cell and the default DL BWP for the secondary cell.
  • the terminal is the first active downlink on the secondary cell by a higher layer parameter (Active-BWP-DL-SCell (Active-BWP-DL-SCell) for SCell and Active Uplink BWP (Active-BWP-UL-SCell) for SCell) If the BWP and the first active uplink BWP are configured, the terminal uses the indicated downlink BWP and the indicated uplink BWP on the secondary cell as the first active downlink BWP and the first active uplink BWP on the secondary cell.
  • Active-BWP-DL-SCell Active-BWP-DL-SCell
  • Active Uplink BWP Active Uplink BWP
  • the UE uses the indicated DL BWP and the indicated UL BWP on the secondary cell as the respective first active DL BWP and first active UL BWP on the secondary cell or carrier.
  • a UE is not expected to transmit HARQ-ACK if the UE changes its active UL BWP between a time of a detection of a DCI format 1_1 and a time of a corresponding HARQ-ACK transmission.
  • the UE monitors the PDCCH when the UE performs measurement through a band other than the DL BWP for the UE. (A UE is not expected to monitor PDCCH when the UE performs measurements over a bandwidth that is not within the DL BWP for the UE.)
  • One serving cell may be configured with one or a plurality of BWPs.
  • BWP switching for one serving cell is used to activate one inactive BWP at a time and to deactivate one active BWP.
  • BWP switching is controlled by the MAC entity itself by the BWP Inactivity Timer, by the PDCCH indicating the downlink allocation or uplink grant, by the BWP Inactivity Timer.
  • a special cell such as PCelll or PSCell or activation of one SCell
  • one BWP may be initially activated without receiving a PDCCH indicating one downlink allocation or one uplink grant.
  • the active BWP for one serving cell is indicated by RRC or PDCCH.
  • the BWP switching for a Serving Cell is used to activate an inactive BWP and deactivate an active BWP at a time.
  • the BWP switching is controlled by the PDCCH indicating a downlink assignment or an uplink grant, by the bandwidthPartInactivityTimer, or by the MAC entity itself upon initiation of Random Access procedure.
  • one BWP is initially active without receiving PDCCH indicating a downlink assignment or an uplink grant.
  • the active BWP for a Serving Cell is indicated by either RRC or PDCCH.
  • a DL BWP is paired with a UL BWP, and BWP switching is common for both UL and DL.
  • the MAC entity When it is the active BWP for each activated serving cell configured with one BWP, the MAC entity must apply the normal operation, which includes:
  • the MAC entity On the active BWP for each activated Serving Cell configured with a BWP, the MAC entity shall apply normal operations including:
  • the MAC entity When it is an inactive BWP for each activated serving cell configured with one BWP, the MAC entity should operate as follows.
  • the MAC entity On the inactive BWP for each activated Serving Cell configured with a BWP, the MAC entity shall:
  • the MAC entity If the MAC entity receives the PDCCH for BWP switching of one serving cell, the MAC entity operates as follows.
  • BWP switching is performed with the BWP indicated in the PDCCH.
  • the MAC entity shall:
  • the MAC entity for each activated serving cell,
  • the default DL BWP is configured and the active DL BWP is not the BWP indicated by the upper layer parameter default DL BWP, or
  • MAC PDU is sent to a configured uplink grant or received in a configured downlink assignment
  • the BWP inactivity timer associated with the active DL BWP of this serving cell is stopped.
  • the serving cell is an SCell (not a PSCell).
  • the BWP inactivity timer associated with the active DL BWP of the special cell (SpCell) is stopped.
  • the MAC entity shall for each activated Serving Cell:
  • the following is a new SCell state for reducing the activation delay of the SCell (eg for supporting the fast activation state) and / or for reducing the power consumption of the activated SCell.
  • the new SCell state which is distinguished from the state, is marked as dormant state.
  • dormant state is mid activation state, quick activation state, low power activation state, high power deactivation state, new SCell state, medium power SCell state, fast activation state, midstate, mid activated state, semi activated state, semi deactivated state, hibernation It may be replaced by any name such as status.
  • the dormant state may indicate an arbitrary state for the SCell which is distinguished from an activated state for the SCell or an inactive state for the SCell.
  • the SCell may indicate a state of transitioning from an inactive state to an activated state.
  • a state in which the SCell is ready / going / waiting for a transition from inactive state to active state and accordingly is an active state operation transmitted on the UL-SCH at that SCell, on the RACH at the SCell, at the SCell
  • One or more operations of monitoring the PDCCH, transmitting the PUCCH in the SCell, and reporting the channel state for the SCell may be performed.
  • the dormant state supports only periodic channel state information reporting (CQI reporting or CSI: channel state information reporting) based on a reference signal (eg, CRS in LTE or CSI-RS in NR), and does not perform PDCCH monitoring. Indicates the state.
  • the dormant state may be based on periodic channel state information reporting (CQI reporting or CSI reporting) and / or aperiodic channel state information reporting (CQI reporting or based on a reference signal (eg CRS in LTE or CSI-RS in NR)).
  • CQI reporting or CSI reporting periodic channel state information reporting
  • CQI reporting or based on a reference signal eg CRS in LTE or CSI-RS in NR
  • CSI Reporting does not perform PDCCH monitoring.
  • the channel state reporting may include, for example, reporting one or more of CQI, PMI, RI, PTI, and CRI of LTE.
  • Other examples may include reporting of one or more of NR's Channel Quality Indicator (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), strong layer indication (SLI), rank indication (RI), and L1-RSRP.
  • CQI Channel Quality Indicator
  • PMI precoding matrix indicator
  • CRI CSI-RS resource indicator
  • SLI strong layer indication
  • RI rank indication
  • L1-RSRP L1-RSRP
  • the dormant SCell follows the DRX of the PCell / PSCell for triggering the channel status report / RRM measurement report.
  • the SCell in the dormant state may follow the DRX of the PCell / PSCell for triggering the channel status report / RRM measurement report and may wake up before the DRX cycle to indicate a state of monitoring a specific region on the PDCCH or a specific physical layer channel.
  • the SCell in the dormant state may represent a state of monitoring a specific region on a PDCCH or a specific physical layer channel at a specific period for triggering a channel state report / RRM measurement report.
  • FIG. 11 is a diagram illustrating a state change of a secondary cell, according to an exemplary embodiment.
  • the SCell may transition from the activated state 1110 to the deactivated state 1130.
  • the SCell may transition from the deactivated state 1130 to the activated state 1110.
  • the SCell may transition from the activated state 1110 to the dormant state 1120.
  • the SCell may transition from the sleep state 1120 to the activation state 1110.
  • the SCell may transition from the deactivated state 1130 to the dormant state 1120.
  • the SCell may transition from the sleep state 1120 to the inactive state 1130.
  • the sleep state 1120 may be replaced with various names in arbitrary terms set for convenience of description.
  • the base station can transition the state of a specific SCell through the MAC CE.
  • the SCell transition operation may be performed through a timer (for example, an SCell inactivity timer or an SCell dormant timer) for transitioning from one state to another.
  • the activated SCell 1110 may transition to the sleep state 1120 when the SCell dormant timer expires.
  • the base station may change the SCell configured in the terminal to the dormant state.
  • the terminal configures the corresponding SCell in an inactive state.
  • the UE that receives the RRC reconfiguration message including the cell group configuration information (CellGroupConfig) including the SCell addition modification list (sCellToAddModList) adds or modifies the SCell for each entry of the SCell addition modification list.
  • CellGroupConfig cell group configuration information
  • SCellToAddModList SCell addition modification list
  • UE shall configure lower layers to consider the SCell to be in deactivated state.
  • the base station instructs the terminal to the MAC CE for activating the SCell. Accordingly, the terminal activates the corresponding SCell. Thereafter, the base station may instruct the terminal to transition to the dormant SCell through the MAC CE.
  • the base station may instruct the terminal to configure the SCell configured in an inactive state into a dormant state.
  • the base station may instruct the terminal to configure the SCell in the dormant state when adding / configuring the SCell.
  • the state of the SCell configured in the terminal transitions to the dormant state according to the above-described operation, it is necessary to determine the BWP of the SCell. For example, if the SCell transitions to the dormant state under the control of the base station when the SCell is operating in the first BWP, the BWP of the SCell is changed or to which BWP if the BWP is changed. You must decide. However, with no discussion of this at present, the present disclosure proposes various embodiments for the operation of controlling the BWP when the SCell changes to the dormant state.
  • FIG. 12 is a diagram for describing an operation of determining, by a terminal, a BWP of a secondary cell according to an embodiment.
  • the terminal in a method of changing a state of a secondary cell, includes an RRC message including one or more bandwidth parts (BWP) information for the secondary cell and CSI-RS configuration information associated with one or more BWPs from the base station.
  • Receiving may be performed (S1200).
  • the terminal may receive BWP information for applying to the secondary cell (SCell) from the base station.
  • the BWP for application to the secondary cell may be the same as or different from the BWP of the primary cell.
  • the BWP information may be received by the terminal without being divided into a primary cell or a secondary cell. In this case, the UE can apply the BWP information to the secondary cell.
  • the BWP information may be received in association with the CSI-RS configuration information. That is, BWP information and CSI-RS configuration information may be mapped and received by the terminal.
  • the BWP information may include CSI-RS configuration information applied to the BWP.
  • the BWP information may be included in the CSI-RS configuration information.
  • the terminal may perform a step of receiving a MAC control element for changing the state of the secondary cell from the active state to the dormant state (Dormant State) from the base station (S1210).
  • a MAC control element for changing the state of the secondary cell from the active state to the dormant state (Dormant State) from the base station (S1210).
  • the terminal may receive a signal indicating a state change of the secondary cell from the base station.
  • the signal indicating the change of state of the secondary cell may be MAC CE or L1 signaling.
  • the MAC CE may indicate a state change of a specific secondary cell in a bitmap format.
  • the terminal may change the state of the secondary cell by combining the state of the current secondary cell and the indication value included in the MAC CE.
  • the terminal may change the state of the secondary cell to the dormant state based on the MAC control element, and may determine the BWP of the secondary cell (S1220).
  • the terminal receives the MAC CE from the base station, the terminal changes the state of the secondary cell from the active state to the dormant state.
  • the terminal determines the BWP to be applied to the secondary cell in the dormant state.
  • the terminal may determine the BWP of the secondary cell as the dormant state first BWP.
  • the RRC message may include first BWP information to be applied to the secondary cell in the dormant state. That is, the UE may change the activated BWP to the dormant first BWP when the secondary cell is changed to the dormant state by using the dormant first BWP information indicated in the RRC message.
  • the terminal may determine the BWP of the secondary cell as the first BWP. More specifically, the RRC message does not include first BWP information to be applied in the dormant state, but may include first BWP information to be applied in the activated state. In this case, when the secondary cell changes to the dormant state, the terminal may change the BWP of the secondary cell to the activated state first BWP regardless of the state of the secondary cell.
  • the terminal may determine the BWP of the secondary cell as the default BWP. That is, the RRC message may include default BWP information.
  • the terminal may determine the secondary cell BWP in the dormant state as the default BWP without considering the BWP in the activated state.
  • the UE may determine whether to change the BWP when the secondary cell changes to the dormant state using a timer.
  • the RRC message may include a BWP Inactivity Timer.
  • the terminal may differently determine the BWP according to whether the BWP inactivity timer expires. If the secondary cell changes to the dormant state and the BWP inactivity timer expires, the terminal may determine the BWP of the secondary cell as the default BWP.
  • the default BWP may be separately indicated to the terminal through the RRC message as described above.
  • the terminal may maintain the BWP applied by the corresponding secondary cell in the activated state. Thereafter, when the BWP inactivity timer expires, the terminal may change the BWP of the dormant secondary cell to the default BWP.
  • the terminal may change the BWP applied in the activated state to the inactive state.
  • the terminal may determine the BWP by various methods.
  • the terminal does not transmit on the UL-SCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit on the RACH. Or, if the SCell is in the dormant state, the SCell does not monitor the PDCCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit the PUCCH. Or, if the corresponding SCell is in the dormant state, one or more operations are applied during the dormant state operation. However, since the SCell performs channel state reporting even in the dormant state, it consumes more power than the deactivation state.
  • the UE needs to more efficiently process power consumed when performing CSI-RS measurement for channel state reporting in the dormant state.
  • the base station RRC the first (DL) BWP and / or the associated CSI-RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)) that can be applied in the dormant state when the SCell transitions to the dormant state. It can be indicated to the terminal through the connection reconfiguration message. That is, the UE may receive first BWP information through an RRC message.
  • first BWP configuration information and / or associated CSI-RS configuration information (or CSI-RS measurement configuration (CSI-MeasConfig)) is applied first when the SCell is activated. It may be a separate information element that is distinguished from a first active DL BWP when SCell is activated information element and a CSI-RS configuration information element (or CSI-RS measurement configuration information element) associated therewith. .
  • the terminal sleeps the indicated first BWP. Use as the first downlink BWP on the state secondary cell.
  • first BWP configuration information to be applied when the SCell transitions to the dormant state and / or associated CSI-RS configuration information
  • the UE uses the indicated BWP and / or the associated CSI-RS configuration as the first downlink BWP and / or associated CSI-RS measurement on the dormant secondary cell.
  • the terminal may apply the dormant state first BWP or CSI-RS configuration information configured through the RRC message to the dormant secondary cell.
  • the aforementioned first means the first BWP among the BWPs indicated to the terminal. For example, when index information is mapped to a BWP, it may mean a BWP to which the lowest (e.g. 0) or the highest index is assigned.
  • the UE When there is one active DL BWP for the dormant SCell, the UE performs CSI reporting but does not monitor the PDCCH on the active DL BWP.
  • the terminal does not transmit on the UL-SCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit on the RACH. Or, if the SCell is in the dormant state, the SCell does not monitor the PDCCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit the PUCCH. Or, if the corresponding SCell is in the dormant state, one or more operations are applied during the dormant state operation. However, since the SCell performs channel state reporting even in the dormant state, it consumes more power than the deactivation state.
  • the base station (DL) BWP and / or its associated CSI-RS configuration (or CSI-RS) when the SCell transitions to the dormant state may be indicated to the terminal through an RRC connection reconfiguration message.
  • the terminal when the SCell transitions to the dormant state, the terminal is to apply the first active DL BWP when SCell is activated information element applied when the SCell is activated and the associated CSI-RS configuration information element. Can be.
  • a first active DL BWP applied when activated through a higher layer information element (first active DL BWP when SCell is activated) is configured in the terminal. If the terminal supports the dormant SCell state, the terminal uses the first active DL BWP as the first downlink BWP on the dormant secondary cell.
  • the UE determines the first active DL BWP and / or the CSI-RS configuration associated with it in the first downlink BWP and / or CSI-associated with the dormant secondary cell. Used as RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)).
  • the UE may similarly apply the first active BWP in the activated state indicated by the RRC message to the dormant secondary cell.
  • the aforementioned first means the first BWP among the BWPs indicated to the terminal.
  • index information when index information is mapped to a BWP, it may mean a BWP to which the lowest (e.g. 0) or the highest index is assigned.
  • the terminal does not transmit on the UL-SCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit on the RACH. Or, if the SCell is in the dormant state, the SCell does not monitor the PDCCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit the PUCCH. Or, if the corresponding SCell is in the dormant state, one or more operations are applied during the dormant state operation. However, since the SCell performs channel state reporting even in the dormant state, it consumes more power than the deactivation state.
  • the base station (DL) BWP and / or its associated CSI-RS configuration (or CSI-RS) when the SCell transitions to the dormant state Measurement configuration can be switched efficiently.
  • the base station may indicate a default DL BWP and a CSI-RS configuration information element (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the terminal through the RRC connection reconfiguration message.
  • the UE may determine the BWP of the dormant secondary cell by using the indicated default DL BWP and the CSI-RS configuration information element (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with it.
  • the UE sleeps the indicated Default DL BWP. Use as the first downlink BWP on the state secondary cell.
  • the terminal uses the upper layer information element (eg, Default-DL-BWP) and / or CSI-RS configuration information (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the default-DL- If the BWP and / or the CSI-RS configuration information associated with the BWP is configured, the UE may configure the indicated Default-DL-BWP and / or the associated CSI-RS configuration with the (first) downlink BWP and / or on the dormant secondary cell. Or use it as a linked CSI-RS measurement.
  • the upper layer information element eg, Default-DL-BWP
  • CSI-MeasConfig CSI-RS measurement configuration
  • the initial active downlink BWP may be used as the Default-DL-BWP described in the above embodiments.
  • the terminal does not transmit on the UL-SCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit on the RACH. Or, if the SCell is in the dormant state, the SCell does not monitor the PDCCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit the PUCCH. Or, if the corresponding SCell is in the dormant state, one or more operations are applied during the dormant state operation. However, since the SCell performs channel state reporting even in the dormant state, it consumes more power than the deactivation state.
  • the active BWP other than the default BWP (or the initial active BWP) if the BWP inactivity timer associated with the active DL BWP expires, and if the default DL BWP is configured, the BWP is switched to the BWP indicated by the default DL BWP.
  • the active BWP that is not the default BWP (or the initial active BWP) has the BWP inactivity timer associated with the active DL BWP expired, and the BWP switches to the initial DL BWP if the default DL BWP has not been configured.
  • power consumption may not increase significantly.
  • the active BWP may be maintained without changing the BWP even when the terminal transitions to the dormant state.
  • the terminal may maintain the active BWP and / or the CSI-RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the SCell.
  • the terminal may maintain the active BWP applied in the previous activation state until the BWP inactivity timer associated with the active BWP expires. Thereafter, when the BWP inactivity timer expires, the terminal may change the BWP.
  • the changed BWP may be determined as one of the embodiments 1) to 3) described above.
  • the terminal may maintain the current active BWP.
  • the terminal may maintain the current active BWP.
  • the terminal does not transmit on the UL-SCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit on the RACH. Or, if the SCell is in the dormant state, the SCell does not monitor the PDCCH. Or, if the corresponding SCell is in the dormant state, the SCell does not transmit the PUCCH. Or, if the corresponding SCell is in the dormant state, one or more operations are applied during the dormant state operation. However, since the SCell performs channel state reporting even in the dormant state, it consumes more power than the deactivation state. Therefore, when the UE transitions to the dormant state, it is desirable to minimize any operation related to the BWP to the inactive state level in order to reduce power consumption.
  • the terminal deactivates the active BWP and / or the CSI-RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the SCell.
  • the CSI-RS configuration or CSI-RS measurement configuration (CSI-MeasConfig)
  • the terminal switches the active BWP and / or CSI-RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the SCell.
  • CSI-RS configuration or CSI-RS measurement configuration (CSI-MeasConfig)
  • the terminal switches the CSI-RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the active BWP and / or dormant state of the SCell.
  • CSI-RS configuration or CSI-RS measurement configuration (CSI-MeasConfig)
  • the terminal stops the BWP inactivity timer of the corresponding SCell.
  • the power consumption can be reduced by applying the BWP switching operation used by the SCell to reduce power consumption in the active state even in the dormant state.
  • the above-described embodiments may be equally applied to the CSI-RS configuration switching operation.
  • the CSI-RS configuration may be associated with the BWP or may be configured independently of the BWP.
  • the configuration can be activated when the SCell is switched to sleep.
  • the network may activate or deactivate the configured SCells.
  • the network may instruct the configured SCell to configure or transition to a dormant state.
  • the SCell configured as an example may be controlled to be in an inactive state at the time of addition / configuration or after handover.
  • the terminal may receive an RRC connection reconfiguration message including SCell status indication information indicating the SCell activation status for the SCell from the base station.
  • the UE may be configured to be activated when the SCell is added / configured or initially after the handover.
  • the terminal may receive an RRC connection reconfiguration message including information indicating a dormant state for the SCell from the base station.
  • the terminal may be configured to be in a dormant state when adding / configuring the corresponding SCell or after the handover.
  • the RRC message for the aforementioned operation may include SCell state indication information indicating the state of the SCell in the SCell configuration information.
  • the SCell status indication information may be included as one information element in common SCell configuration information (e.g. commonSCellconfig) applied to a specific SCells group and applied to a specific SCell group.
  • the SCell status indication information may be included as one information element in SCell configuration information (e.g. SCellToAddMod) applied to an individual SCell and applied to a specific SCell.
  • the SCell state indication information is composed of 2 bits, it can be instructed to indicate the value of one of the activation state, inactive state and dormant state for the SCell. In the case of two bits, one value can be left as a spare value.
  • SCell state indication information may be composed of SCellstate ENUMERATE ⁇ activate, deactivate, dormant, spare ⁇ .
  • the SCell state indication information may be configured with 1 bit, and may be instructed to indicate one of an activated state and a dormant state for the corresponding SCell.
  • the SCell state indication information may be composed of SCellstate ENUMERATE ⁇ activate, dormant ⁇ or SCellstate ENUMERATE ⁇ TRUE (activate), FALSE (dormant ⁇ , in which case the corresponding information element (eg SCellstate) is OPTIONAL. Therefore, if the SCell status indication is not included in the above-described SCell configuration information, the secondary cell may be configured to be in an inactive state at the time of adding or configuring the SCell or after the handover as in the prior art.
  • an RRC message is received containing information indicating a sleep state for a SCell
  • a MAC CE containing information indicating a sleep state is received for a SCell, or when transitioning to a sleep state.
  • the terminal does not transmit the SRS on the SCell. In addition, the terminal does not transmit on the UL-SCH on the SCell. In addition, the terminal does not transmit on the RACH on the SCell. In addition, the UE does not monitor the PDCCH on the SCell. In addition, the terminal does not transmit the PUCCH on the SCell. Alternatively, the terminal may perform one or more of the above-described operations.
  • the UE sends a message to the SCell according to the cycle indicated by the aforementioned BWP configuration in the dormant state and / or the aforementioned CSI-RS configuration information (or CSI measurement configuration information) and / or the periodic CQI reporting configuration in the dormant state.
  • CQI Channel Quality Indicator
  • PSI CSI-RS resource indicator
  • SLI strong layer indication
  • RI rank indication
  • the aforementioned CSI-RS configuration information includes dormant measurement cycle information, measurement resource information, measurement frequency information, CSI-RS resource information (CSI-RS-Resource), and CSI-RS-density.
  • Information, CSI-RS-FreqBand, CSI-RS-time configuration information, reporting period information, CQI PUCCH resource information, CQI format indication information and may include one or more information of the parameter information for calculating the period information.
  • the aforementioned CQI reporting configuration information of the dormant state may include measurement period information, measurement resource information, measurement frequency information, CSI-RS resource information, CSI-RS-density information, and CSI- One or more of RS-FreqBand, CSI-RS-time configuration information, reporting period information, CQI PUCCH resource information, CQI format indication information, and parameter information for calculating period information may be included.
  • the terminal stops / stops it. In addition, the terminal flushes all HARQ buffers associated with the corresponding SCell. Alternatively, the terminal stops / stops the SCell deactivation Timer associated with the SCell and flushes all HARQ buffers associated with the SCell.
  • SCellDeactivationTimer SCellDeactivationTimer
  • the terminal performs the above-described BWP switching and / or CSI-RS configuration (CSI measurement configuration) switching operation.
  • the terminal may stop the aforementioned BWP inactivity timer and / or perform CSI-RS configuration (CSI measurement configuration) switching.
  • one LCID may be used to create a dormant MAC CE format of 1 to 4 octets or a MAC CE format for indicating activation / deactivation. That is, a single MAC CE format may provide a variable length dormant MAC CE format or a MAC CE format for indicating activation / deactivation.
  • FIG. 13 illustrates a MAC CE indicating a state change of a secondary cell, according to an exemplary embodiment.
  • the MAC CE format has a CSi field (or cell state i: status information of a SCell having a serving cell index / SCellindex i) of a specific number or more (for example, 6 bits or more or 7 bits or more). It may include a length (Len) field for indicating whether to include.
  • the length field may be named as variable length indication information or a MAC CE size field (bit).
  • the length field may be replaced with any name having the same meaning and may be composed of one bit, two bits, or three bits. A description will be given on the basis of a case in which a length field includes one bit, but is not limited thereto.
  • the length field / bit may include a CSi field up to another specific number (eg serving cell index / SCellindex 7 or 15 or 23). If the length field / bit is set to "0", it may include CSi fields up to all SCell indexes (eg, serving cell index / SCellindex 31).
  • the length field / bit may include CSi fields up to serving cell index / SCellindex 7 or 15 or 23). If the length field / bit is set to "0", it may include CSi fields up to the serving cell index / SCellindex 31.
  • the length field / bit may have four values of 00, 01, 10, and 11.
  • CSi fields up to serving cell index / SCellindex 7 CSi fields up to serving cell index / SCellindex 15, CSi fields up to serving cell index / SCellindex 23, and CSi fields up to serving cell index / SCellindex 31 are indicated. can do.
  • the length field is set to "00", it includes CSi fields up to serving cell index / SCellindex 7; if it is set to "01", it contains CSi fields up to serving cell index / SCellindex 15; If set to include the CSi field up to serving cell index / SCellindex 23, if set to "11" may include a CSi field up to serving cell index / SCellindex 31.
  • the status CSi field of the SCell having the serving cell index / SCellindex i may be configured as a 1-bit field in case of distinguishing only a dormant / activated state or in distinguishing only a dormant / inactive state.
  • the status CSi field of the SCell having the serving cell index / SCellindex i may be configured as a 2-bit field to distinguish a dormant / activated / deactivated state.
  • Three values, 00, 01, 10, and 11, which can be configured through two bits, are used to distinguish sleep state, active state, and inactive state, and the other value can be left as a spare / reserved bit. If the terminal is instructed to the other one value in the corresponding CSi field, the terminal may ignore the corresponding CSi field.
  • an extension field may be used as another example of using the above-described length field / bit.
  • an extension field indicating a flag for indicating whether there are more CSi fields in one octet or in two octets may be defined as another example for providing a variable length MAC CE.
  • an extended field may be included in the bit next to the Reserved bit if the Reserved bit is used in the start bit of every octet or in the last bit of every octet or in an octet.
  • an extension field indicating a flag for indicating whether more CSi fields exist in one octet is set to “1”
  • CSi fields included in at least one octet may be included. If the CSi field consists of 1 bit, up to 7 CSi fields may be included. If the CSi field consists of 2 bits, up to three CSi fields may be included. If this extended field is set to '0', it indicates that one MAC SDU or padding is started in the next byte.
  • an extension field indicating a flag indicating whether more CSi fields exist in two octets is set to “1”
  • CSi fields included in at least two octets may be included. If the CSi field consists of 1 bit, up to 15 CSi fields may be included. If the CSi field consists of 2 bits, up to 7 CSi fields may be included. If this extended field is set to '0', it indicates that one MAC SDU or padding is started in the next byte.
  • the subheader of the corresponding MAC CE may include information for distinguishing the MAC CE for one octet and the MAC CE for four octets.
  • the subheader of the MAC CE may include information for indicating the octet number of the corresponding MAC CE through an octet number or a length field.
  • the MAC control element may be configured in a format including a field for indicating the state of the secondary cell as the activated state or the dormant state for each secondary cell index.
  • Each format consists of a reserve bit (R) and a bit (C i ) separated by the index of each cell. Up to seven secondary cell indexes may be indicated and up to 31 secondary cell indexes may be indicated.
  • the MAC CE of one octet is identified by the MAC PDU subheader.
  • MAC CE has a fixed size and consists of a single octet including seven C fields and one R field.
  • the four octets of the MAC CE are identified by the MAC PDU subheader.
  • MAC CE has a fixed size and consists of four octets including 31 C fields and one R field.
  • the terminal may determine an index of the corresponding secondary cell, determine a bit value of the corresponding index cell, and determine whether to transition to a corresponding secondary cell.
  • the terminal may set the index field value of the secondary cell to a value indicating the activation state, and when the state of the secondary cell is a dormant state, the terminal may transition the state of the secondary cell to the active state.
  • the terminal may be set to a value indicating the activation state of the index field for the secondary cell, and if the state of the secondary cell is not dormant, the terminal may ignore the value of the index field and maintain the state at the time of reception. have.
  • the MAC CE of one octet is applied to a case in which no serving cell index (ServCellIndex) is greater than eight. Otherwise the MAC CE of 4 octets described above is applied.
  • the Ci field indicates the state of the SCell configured with the SCellIndex i if there is a SCell configured with the SCellIndex i. Otherwise, the MAC entity MUST ignore the Ci field.
  • SCell index 1 (C1) is inactive at the time of receiving the corresponding MAC CE
  • SCell index 3 (C3) is dormant
  • SCell index 5 (C5) is activated.
  • the Ci field is set to "1" to indicate that the SCell with SCellIndex i should transition to the dormant state.
  • the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be activated.
  • the R field is set to "0" with the Reserved bit.
  • the UE determines the state transition by using the current state of the secondary cell having the corresponding SCell index and the indication value indicated by the MAC CE.
  • the terminal is set to a value (eg, "0") indicating the activation state of the index field for the secondary cell, and transitions the state of the secondary cell to the active state when the state of the secondary cell is dormant. can do. That is, since C3 is set to 0, the UE transitions the secondary cell having the dormant SCell index of 3 to the active state.
  • a value eg, "0"
  • the terminal is set to a value (eg, "0") indicating the activation state of the index field for the secondary cell, and ignores the index field value when the state of the secondary cell is not dormant. That is, although C1 is set to 0, since the secondary cell having the SCell index of 1 is not in the dormant state, the terminal maintains the secondary cell in an inactive state.
  • a value eg, "0"
  • the terminal transitions the state of the secondary cell to the dormant state. That is, since C5 is set to 1, the terminal transitions the secondary cell having the SCell index of 5 to the dormant state.
  • the terminal controls the state of the secondary cell based on the MAC CE including information indicating one of an activated state and a dormant state.
  • the MAC CE may be divided into a MAC CE including a field indicating an activation state / sleep state and a MAC CE including a field indicating an activation state / deactivation state.
  • FIG. 14 is a diagram for describing an operation of determining, by a base station, a BWP of a secondary cell according to an embodiment.
  • the base station in a method of changing a secondary cell state of a terminal, includes an RRC including at least one bandwidth parts (BWP) information for the secondary cell and CSI-RS configuration information associated with at least one BWP.
  • the transmitting of the message may be performed (S1400).
  • the base station may transmit BWP information to be applied to the secondary cell (SCell) to the terminal.
  • the BWP for application to the secondary cell may be the same as or different from the BWP of the primary cell.
  • the BWP information may be transmitted to the terminal instead of being divided into a primary cell or a secondary cell.
  • the UE can apply the BWP information to the secondary cell.
  • the BWP information may be transmitted in association with the CSI-RS configuration information. That is, BWP information and CSI-RS configuration information may be mapped and transmitted to the terminal.
  • the BWP information may include CSI-RS configuration information applied to the BWP.
  • the BWP information may be included in the CSI-RS configuration information.
  • the base station may perform the step of determining to change the secondary cell state of the terminal from the active state to the dormant state (Dormant State) (S1410).
  • the base station may change the secondary cell state of the terminal in consideration of transmission and reception data generation and traffic amount. For example, when the downlink data traffic to be transmitted to a specific terminal occurs, the base station may determine to change the secondary cell configured in the terminal to an active state and utilize the secondary cell. Alternatively, the base station may determine to change the secondary cell to a dormant state or an inactive state when the secondary cell of the specific terminal is not used or is expected to be not used.
  • the base station may perform a step of transmitting a MAC control element for changing the state of the secondary cell from the active state to the dormant state to the terminal (S1420).
  • the base station may transmit a signal indicating a state change of the secondary cell to the terminal.
  • the signal indicating the change of state of the secondary cell may be MAC CE or L1 signaling.
  • the MAC CE may indicate a state change of a specific secondary cell in a bitmap format.
  • the terminal may change the state of the secondary cell by combining the state of the current secondary cell and the indication value included in the MAC CE.
  • the above-described embodiment may be applied to change the state of the secondary cell through the MAC CE.
  • the terminal changes the state of the secondary cell to the dormant state based on the MAC control element, and determines the BWP of the secondary cell.
  • the terminal When the terminal receives the MAC CE from the base station, the terminal changes the state of the secondary cell from the active state to the dormant state. In addition, when the state of the secondary cell changes from the active state to the dormant state, the terminal determines the BWP to be applied to the secondary cell in the dormant state.
  • the terminal may determine the BWP of the secondary cell as the dormant state first BWP.
  • the RRC message may include first BWP information to be applied to the secondary cell in the dormant state. That is, the UE may change the activated BWP to the dormant first BWP when the secondary cell is changed to the dormant state by using the dormant first BWP information indicated in the RRC message.
  • the terminal may determine the BWP of the secondary cell as the first BWP. More specifically, the RRC message does not include first BWP information to be applied in the dormant state, but may include first BWP information to be applied in the activated state. In this case, when the secondary cell changes to the dormant state, the terminal may change the BWP of the secondary cell to the activated state first BWP regardless of the state of the secondary cell.
  • the terminal may determine the BWP of the secondary cell as the default BWP. That is, the RRC message may include default BWP information.
  • the terminal may determine the secondary cell BWP in the dormant state as the default BWP without considering the BWP in the activated state.
  • the UE may determine whether to change the BWP when the secondary cell changes to the dormant state using a timer.
  • the RRC message may include a BWP Inactivity Timer.
  • the terminal may differently determine the BWP according to whether the BWP inactivity timer expires. If the secondary cell changes to the dormant state and the BWP inactivity timer expires, the terminal may determine the BWP of the secondary cell as the default BWP.
  • the default BWP may be separately indicated to the terminal through the RRC message as described above.
  • the terminal may maintain the BWP applied by the corresponding secondary cell in the activated state. Thereafter, when the BWP inactivity timer expires, the terminal may change the BWP of the dormant secondary cell to the default BWP.
  • the UE may change the BWP applied in the activated state to the inactive state.
  • the present disclosure may provide a terminal operation for reducing power consumption in a SCell state in which the terminal supports fast SCell use and / or power consumption reduction.
  • 15 is a diagram illustrating an example of a terminal configuration.
  • a UE 1500 performing a DRX operation receives a RRC message including a plurality of DRX configurations from a base station and instructs a MAC control element (MAC CE) to change a DRX configuration from the base station.
  • MAC CE MAC control element
  • the receiver 1530 receives an RRC message including a plurality of DRX configuration information.
  • Each of the plurality of DRX configuration information may include at least one of the aforementioned DRX parameters.
  • the DRX configuration information may include the aforementioned DRX parameters, and the plurality of DRX configuration information may include DRX parameters, respectively.
  • the DRX configuration information includes the aforementioned DRX parameters, DRX parameters common to the plurality of DRX configuration information are received as common DRX configuration information, and each DRX configuration information may include only values for different DRX parameters. have.
  • the RRC message may include DRX index information for distinguishing and indicating each of the plurality of DRX configurations.
  • DRX index information is allocated to each of the plurality of DRX configurations, and is used for identifying the DRX configuration.
  • the RRC message may be an RRC connection reconfiguration message.
  • the receiving unit 1530 of the terminal 1500 that receives and stores the plurality of DRX configurations may receive a signal instructing to apply a specific DRX configuration from the base station. Since the control unit 1510 applies one DRX configuration, the controller 1510 must determine which DRX configuration to be applied among the DRX configurations received by the RRC message. To this end, the controller 1510 may apply the DRX configuration indicated by the MAC CE received from the base station. Alternatively, the controller 1510 may apply the DRX configuration indicated by the L1 signaling received from the base station.
  • the MAC control element (MAC CE) or L1 signaling may include DRX index information for indicating a DRX configuration to be applied to the terminal among a plurality of DRX configurations.
  • the controller 1510 may identify a DRX configuration mapped to DRX index information indicated by MAC CE or L1 signaling.
  • the controller 1510 checks the DRX configuration indicated by the base station among the plurality of DRX configurations described above, and performs a DRX operation by using the DRX parameter of the indicated DRX configuration. If the DRX configuration is set to a separate DRX configuration divided by a common DRX configuration and a DRX index, the controller 1510 applies the DRX parameters of the common DRX configuration and combines the DRX parameters of the indicated individual DRX configurations to DRX. Perform the action.
  • the transmitter 1520 may instruct the base station of a specific DRX configuration selected by the terminal among a plurality of stored DRX configurations.
  • the transmitter 1520 may transmit DRX index information that the UE prefers or expects to apply to the base station at any time.
  • the transmitter 1520 may transmit priority information set by the terminal to a plurality of DRX configurations to the base station.
  • the transmitter 1520 may transmit the priority information to the base station through the order or priority information mapping of the DRX indexes allocated to the plurality of DRX configurations.
  • the transmitter 1520 may select two or more DRX configurations that the UE prefers or expects to apply among a plurality of DRX configurations, and transmit the DRX index information of the selected DRX configuration to the base station.
  • controller 1510 controls the overall operation of the terminal 1500 according to the DRX configuration control method required to perform the above-described embodiment.
  • the transmitter 1520 and the receiver 1530 are used to transmit and receive signals, messages, and data necessary for performing the above-described disclosure with the base station.
  • the terminal 1500 for changing the state of the secondary cell receives an RRC message including one or more bandwidth parts (BWP) information for the secondary cell and CSI-RS configuration information associated with one or more BWPs from the base station, Based on the receiving unit 1530 and the MAC control element for receiving the MAC control element for changing the state of the secondary cell from the base station to the dormant state (Dormant State), and changes the state of the secondary cell to the dormant state, the secondary cell And a controller 1510 for determining a BWP of the.
  • BWP bandwidth parts
  • the receiver 1530 may receive BWP information for applying to the secondary cell (SCell) from the base station.
  • the BWP for application to the secondary cell may be the same as or different from the BWP of the primary cell.
  • the BWP information may be received by the receiver 1530 without being divided into a primary cell or a secondary cell.
  • the controller 1510 may apply the BWP information to the secondary cell.
  • the BWP information may be received in association with the CSI-RS configuration information. That is, BWP information and CSI-RS configuration information may be mapped and received by the receiver 1530.
  • the BWP information may include CSI-RS configuration information applied to the BWP.
  • the BWP information may be included in the CSI-RS configuration information.
  • the receiving unit 1530 may receive a signal instructing to change the state of the secondary cell from the base station.
  • the signal indicating the change of state of the secondary cell may be MAC CE or L1 signaling.
  • the MAC CE may indicate a state change of a specific secondary cell in a bitmap format.
  • the controller 1510 may change the state of the secondary cell by combining the state of the current secondary cell and the indication value included in the MAC CE.
  • the controller 1510 changes the state of the secondary cell from the active state to the dormant state. In addition, when the state of the secondary cell changes from the active state to the dormant state, the controller 1510 determines the BWP to be applied to the secondary cell in the dormant state.
  • the controller 1510 may determine the BWP of the secondary cell as the dormant state first BWP.
  • the RRC message may include first BWP information to be applied to the secondary cell in the dormant state. That is, the controller 1510 may change the activated BWP to the dormant state first BWP when the secondary cell is changed to the dormant state by using the dormant state first BWP information indicated in the RRC message.
  • the controller 1510 may determine the BWP of the secondary cell as the first BWP. More specifically, the RRC message does not include first BWP information to be applied in the dormant state, but may include first BWP information to be applied in the activated state. In this case, when the secondary cell changes to the dormant state, the controller 1510 may change the BWP of the secondary cell to the activated state first BWP regardless of the state of the secondary cell.
  • the controller 1510 may determine the BWP of the secondary cell as the default BWP when the secondary cell changes to the dormant state based on the default BWP information included in the RRC message. That is, the RRC message may include default BWP information. When the secondary cell changes to the dormant state, the controller 1510 may determine the secondary cell BWP in the dormant state as the default BWP without considering the BWP in the activated state.
  • the controller 1510 may determine whether to change the BWP when the secondary cell changes to the dormant state by using a timer.
  • the RRC message may include a BWP Inactivity Timer.
  • the controller 1510 may determine the BWP differently according to whether the BWP inactivity timer expires. If the secondary cell changes to the dormant state and the BWP inactivity timer expires, the controller 1510 may determine the BWP of the secondary cell as the default BWP.
  • the default BWP may be separately indicated to the terminal through the RRC message as described above.
  • the controller 1510 may maintain the BWP applied by the secondary cell in the activated state. Thereafter, when the BWP inactivity timer expires, the controller 1510 may change the BWP of the dormant secondary cell to the default BWP. Meanwhile, when the state of the secondary cell is changed to the dormant state, the controller 1510 may change the BWP applied in the activated state to the inactive state.
  • controller 1510 controls the overall operation of the terminal 1500 according to the method for reducing power consumption according to the secondary cell change required to perform the aforementioned embodiment.
  • the transmitter 1520 and the receiver 1530 are used to transmit and receive signals, messages, and data necessary for performing the above-described disclosure with the base station.
  • FIG. 16 illustrates a configuration of a base station according to an embodiment.
  • a base station 1600 that controls a DRX operation of a terminal is applied to a transmitter 1620 for transmitting an RRC message including a plurality of DRX configurations and a plurality of DRX configurations to a terminal.
  • the controller 1610 determines a DRX configuration to be performed.
  • the transmitter 1620 transmits a MAC control element (MAC CE) or L1 signaling for instructing a change of the DRX configuration to the terminal, and the terminal uses the DRX configuration indicated by the MAC control element or L1 signaling among a plurality of DRX configurations. Apply DRX.
  • MAC CE MAC control element
  • the RRC message may include DRX index information for distinguishing and indicating each of the plurality of DRX configurations.
  • the RRC message may be an RRC connection reconfiguration message.
  • the plurality of DRX configurations may be divided into a common DRX configuration including DRX parameters commonly applied to each DRX configuration and a dedicated DRX configuration including DRX parameters having different values set for individual DRX configurations.
  • the MAC control element or L1 signaling may include DRX index information for indicating a DRX configuration to be applied to the terminal among the plurality of DRX configurations.
  • L1 signaling may be the DCI of the PDCCH.
  • the controller 1610 may determine a DRX configuration to be applied to the terminal in consideration of a data traffic arrival type. Alternatively, the controller 1610 may determine a DRX configuration to be applied to the terminal in consideration of the preferred DRX configuration of the terminal transmitted by the terminal.
  • the terminal applies DRX using a DRX configuration indicated by MAC control element or L1 signaling among a plurality of DRX configurations.
  • the terminal checks the DRX configuration indicated by the base station among the plurality of DRX configurations described above, and performs a DRX operation by using the DRX parameter of the indicated DRX configuration. If the DRX configuration is set to a separate DRX configuration divided by a common DRX configuration and a DRX index, the terminal applies the DRX parameter of the common DRX configuration and performs a DRX operation by combining the indicated DRX parameters of the individual DRX configuration. do.
  • controller 1610 controls the overall operation of the base station 1600 according to the DRX configuration control method required to perform the above-described embodiment.
  • the transmitter 1620 and the receiver 1630 are used to transmit and receive signals, messages, and data necessary for carrying out the present disclosure.
  • the base station 1600 transmits an RRC message including one or more bandwidth parts (BWP) information for a secondary cell and CSI-RS configuration information associated with one or more BWPs to a terminal and a secondary cell of the terminal.
  • BWP bandwidth parts
  • CSI-RS configuration information associated with one or more BWPs
  • a controller 1610 that determines to change the state from an active state to a dormant state.
  • the transmitter 1620 transmits a MAC control element for changing the state of the secondary cell from the activated state to the dormant state.
  • the transmitter 1620 may transmit BWP information to be applied to the secondary cell (SCell) to the terminal.
  • the BWP for application to the secondary cell may be the same as or different from the BWP of the primary cell.
  • the BWP information may be transmitted to the terminal instead of being divided into a primary cell or a secondary cell.
  • the UE can apply the BWP information to the secondary cell.
  • the BWP information may be transmitted in association with the CSI-RS configuration information. That is, BWP information and CSI-RS configuration information may be mapped and transmitted to the terminal.
  • the BWP information may include CSI-RS configuration information applied to the BWP.
  • the BWP information may be included in the CSI-RS configuration information.
  • the controller 1610 may change the secondary cell state of the terminal in consideration of transmission / reception data generation and traffic amount. For example, the controller 1610 may determine to change the secondary cell configured in the terminal to an active state when downlink data traffic to be transmitted to a specific terminal occurs. Alternatively, the controller 1610 may determine to change the secondary cell to a dormant state or an inactive state when the secondary cell of the specific terminal is not used or is expected to be not used.
  • the transmitter 1620 may transmit a signal for indicating a state change of the secondary cell to the terminal.
  • the signal indicating the change of state of the secondary cell may be MAC CE or L1 signaling.
  • the MAC CE may indicate a state change of a specific secondary cell in a bitmap format.
  • the terminal changes the state of the secondary cell to the dormant state based on the MAC control element, and determines the BWP of the secondary cell.
  • controller 1610 controls the overall operation of the base station 1600 according to the method for reducing power consumption according to the secondary cell change required to perform the above-described embodiment.
  • the transmitter 1620 and the receiver 1630 are used to transmit and receive signals, messages, and data necessary for carrying out the present disclosure.
  • the above-described embodiments may be implemented through various means.
  • the embodiments may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to the embodiments may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), FPGAs. (Field Programmable Gate Arrays), a processor, a controller, a microcontroller, a microprocessor, and the like.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • a processor a controller, a microcontroller, a microprocessor, and the like.
  • the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function for performing the functions or operations described above.
  • the software code may be stored in a memory unit and driven by a processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • system generally refer to computer-related entity hardware, hardware and software. May mean a combination, software, or running software.
  • the aforementioned components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, an execution thread, a program, and / or a computer.
  • an application running on a controller or processor and a controller or processor can be components.
  • One or more components can reside within a process and / or thread of execution and a component can be located on one system or deployed on more than one system.

Landscapes

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

Abstract

L'invention concerne une technique permettant à un terminal d'exécuter des communications efficaces avec une station de base dans divers environnements. Un mode de réalisation de la présente invention concerne un procédé par lequel un terminal exécute une réception discontinue (DRX), et un appareil correspondant. Le procédé comprend les étapes consistant à : recevoir, d'une station de base, un message RRC contenant une pluralité de configurations DRX ; recevoir, de la station de base, un élément de commande MAC (MAC CE) ou un signal L1 commandant un changement d'une configuration DRX ; et appliquer une DRX selon la configuration DRX indiquée par le MAC CE ou le signal L1 parmi la pluralité de configurations DRX.
PCT/KR2019/002955 2018-03-22 2019-03-14 Procédé pour l'exécution d'une communication par un terminal, et appareil correspondant Ceased WO2019182287A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR20180033347 2018-03-22
KR10-2018-0033347 2018-03-22
KR10-2018-0036790 2018-03-29
KR20180036790 2018-03-29
KR10-2019-0027496 2019-03-11
KR1020190027496A KR20190111767A (ko) 2018-03-22 2019-03-11 단말이 통신을 수행하는 방법 및 그 장치

Publications (1)

Publication Number Publication Date
WO2019182287A1 true WO2019182287A1 (fr) 2019-09-26

Family

ID=67987375

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2019/002955 Ceased WO2019182287A1 (fr) 2018-03-22 2019-03-14 Procédé pour l'exécution d'une communication par un terminal, et appareil correspondant

Country Status (1)

Country Link
WO (1) WO2019182287A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112788759A (zh) * 2019-11-08 2021-05-11 华为技术有限公司 一种通信方法及装置
CN112968755A (zh) * 2019-12-14 2021-06-15 华为技术有限公司 资源配置方法、网络设备及计算机存储介质
US20220015188A1 (en) * 2019-03-27 2022-01-13 Vivo Mobile Communication Co.,Ltd. Method for configuring information, network device, and terminal device
CN114258699A (zh) * 2019-11-07 2022-03-29 Oppo广东移动通信有限公司 控制方法、设备及存储介质
WO2022073480A1 (fr) 2020-10-09 2022-04-14 Huizhou Tcl Cloud Internet Corporation Technology Co., Ltd. Réception discontinue pour des communications de liaisons latérales
EP3944720A4 (fr) * 2019-12-27 2022-05-11 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé de commande de réception discontinue, et dispositif et support de stockage
CN114616918A (zh) * 2019-11-04 2022-06-10 高通股份有限公司 副蜂窝小区休眠指示和应用延迟
WO2022148431A1 (fr) * 2021-01-08 2022-07-14 维沃移动通信有限公司 Procédé et appareil de commutation de configuration de réception discontinue (drx), terminal
US11558167B2 (en) * 2019-07-15 2023-01-17 Samsung Electronics Co., Ltd. Method and apparatus for efficiently operating dormant bandwidth part in a next generation mobile communication system
WO2023014053A1 (fr) * 2021-08-03 2023-02-09 Samsung Electronics Co., Ltd. Équipement utilisateur et procédé mis en œuvre par celui-ci dans un système de communication sans fil
CN115918020A (zh) * 2020-07-09 2023-04-04 高通股份有限公司 用于全双工操作的休眠带宽部分（bwp）配置
EP4106245A4 (fr) * 2020-02-13 2023-04-05 Fujitsu Limited Procédé et dispositif de radiocommunication, et système
CN116438915A (zh) * 2021-09-27 2023-07-14 上海朗帛通信技术有限公司 一种被用于中继无线通信中的方法和装置
US11895582B2 (en) 2018-07-24 2024-02-06 Ofinno, Llc Power saving operations in a wireless communication system
WO2024105651A1 (fr) * 2023-02-10 2024-05-23 Lenovo (Singapore) Pte Limited Alignement d'une réception discontinue (drx) d'équipement utilisateur (ue) avec une transmission discontinue de cellule (dtx)
WO2024151151A1 (fr) * 2023-01-09 2024-07-18 Samsung Electronics Co., Ltd. Procédé et appareil de transmission et de réception discontinues de cellule dans un système de communication sans fil
WO2024156144A1 (fr) * 2023-04-06 2024-08-02 Zte Corporation Procédés, appareils et systèmes de transmission discontinue de cellule et de traitement de signal de réception

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130301500A1 (en) * 2012-05-11 2013-11-14 Ali T. Koc Systems and methods for enhanced user equipment assistance information in wireless communication systems
US20150208462A1 (en) * 2012-08-10 2015-07-23 Lg Electronics Inc. Method and apparatus for configuring a discontinuous reception (drx) operation in a wireless communication system
US20160119875A1 (en) * 2010-11-15 2016-04-28 Samsung Electronics Co., Ltd. Method and apparatus for optimizing power consumption of a terminal in a mobile communication system
KR20170053669A (ko) * 2014-09-09 2017-05-16 블랙베리 리미티드 Lte-u에서의 매체 접근 제어
US20170156176A1 (en) * 2015-05-19 2017-06-01 Telefonaktiebolaget Lm Ericsson (Publ) Activation Of DRX Parameters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160119875A1 (en) * 2010-11-15 2016-04-28 Samsung Electronics Co., Ltd. Method and apparatus for optimizing power consumption of a terminal in a mobile communication system
US20130301500A1 (en) * 2012-05-11 2013-11-14 Ali T. Koc Systems and methods for enhanced user equipment assistance information in wireless communication systems
US20150208462A1 (en) * 2012-08-10 2015-07-23 Lg Electronics Inc. Method and apparatus for configuring a discontinuous reception (drx) operation in a wireless communication system
KR20170053669A (ko) * 2014-09-09 2017-05-16 블랙베리 리미티드 Lte-u에서의 매체 접근 제어
US20170156176A1 (en) * 2015-05-19 2017-06-01 Telefonaktiebolaget Lm Ericsson (Publ) Activation Of DRX Parameters

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11895582B2 (en) 2018-07-24 2024-02-06 Ofinno, Llc Power saving operations in a wireless communication system
US20220015188A1 (en) * 2019-03-27 2022-01-13 Vivo Mobile Communication Co.,Ltd. Method for configuring information, network device, and terminal device
US11558167B2 (en) * 2019-07-15 2023-01-17 Samsung Electronics Co., Ltd. Method and apparatus for efficiently operating dormant bandwidth part in a next generation mobile communication system
CN114616918A (zh) * 2019-11-04 2022-06-10 高通股份有限公司 副蜂窝小区休眠指示和应用延迟
US12389318B2 (en) 2019-11-04 2025-08-12 Qualcomm Incorporated Secondary cell dormancy indication and application delay
CN114258699B (zh) * 2019-11-07 2023-08-29 Oppo广东移动通信有限公司 控制方法、设备及存储介质
CN114258699A (zh) * 2019-11-07 2022-03-29 Oppo广东移动通信有限公司 控制方法、设备及存储介质
CN112788759A (zh) * 2019-11-08 2021-05-11 华为技术有限公司 一种通信方法及装置
US12335931B2 (en) 2019-11-08 2025-06-17 Huawei Technologies Co., Ltd. Communication method and apparatus
CN112968755A (zh) * 2019-12-14 2021-06-15 华为技术有限公司 资源配置方法、网络设备及计算机存储介质
WO2021114917A1 (fr) * 2019-12-14 2021-06-17 华为技术有限公司 Procédé d'attribution de ressources, dispositif de réseau et support d'informations informatique
US12402204B2 (en) 2019-12-27 2025-08-26 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Discontinuous reception control method, device and storage medium
EP3944720A4 (fr) * 2019-12-27 2022-05-11 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Procédé de commande de réception discontinue, et dispositif et support de stockage
US12316415B2 (en) 2020-02-13 2025-05-27 Fujitsu Limited Wireless communication method and device and communication system
EP4106245A4 (fr) * 2020-02-13 2023-04-05 Fujitsu Limited Procédé et dispositif de radiocommunication, et système
CN115918020A (zh) * 2020-07-09 2023-04-04 高通股份有限公司 用于全双工操作的休眠带宽部分（bwp）配置
US12395306B2 (en) 2020-07-09 2025-08-19 Qualcomm Incorporated Dormant bandwidth part (BWP) configuration for full-duplex operation
CN116671188A (zh) * 2020-10-09 2023-08-29 惠州Tcl云创科技有限公司 侧链通信的非连续接收
WO2022073480A1 (fr) 2020-10-09 2022-04-14 Huizhou Tcl Cloud Internet Corporation Technology Co., Ltd. Réception discontinue pour des communications de liaisons latérales
EP4226674A4 (fr) * 2020-10-09 2024-12-18 Huizhou TCL Cloud Internet Corporation Technology Co., Ltd. Réception discontinue pour des communications de liaisons latérales
WO2022148431A1 (fr) * 2021-01-08 2022-07-14 维沃移动通信有限公司 Procédé et appareil de commutation de configuration de réception discontinue (drx), terminal
US12382540B2 (en) 2021-08-03 2025-08-05 Samsung Electronics Co., Ltd. User equipment and method performed by the same in wireless communication system
WO2023014053A1 (fr) * 2021-08-03 2023-02-09 Samsung Electronics Co., Ltd. Équipement utilisateur et procédé mis en œuvre par celui-ci dans un système de communication sans fil
CN116438915A (zh) * 2021-09-27 2023-07-14 上海朗帛通信技术有限公司 一种被用于中继无线通信中的方法和装置
WO2024151151A1 (fr) * 2023-01-09 2024-07-18 Samsung Electronics Co., Ltd. Procédé et appareil de transmission et de réception discontinues de cellule dans un système de communication sans fil
WO2024105651A1 (fr) * 2023-02-10 2024-05-23 Lenovo (Singapore) Pte Limited Alignement d'une réception discontinue (drx) d'équipement utilisateur (ue) avec une transmission discontinue de cellule (dtx)
GB2639453A (en) * 2023-02-10 2025-09-24 Lenovo Singapore Pte Ltd Aligning user equipment (UE) discontinuous reception (DRX) to cell discontinuous transmission (DTX)
WO2024156144A1 (fr) * 2023-04-06 2024-08-02 Zte Corporation Procédés, appareils et systèmes de transmission discontinue de cellule et de traitement de signal de réception

Similar Documents

Publication Publication Date Title
WO2019182287A1 (fr) Procédé pour l'exécution d'une communication par un terminal, et appareil correspondant
WO2020222615A1 (fr) Procédé et appareil pour économiser l'énergie d'un équipement utilisateur dans un système de communication sans fil
WO2021187967A1 (fr) Procédé et dispositif de transmission et de réception de signal de référence de sondage dans un système de communication sans fil
WO2021086128A1 (fr) Procédé et appareil d'économie d'énergie d'un équipement d'utilisateur dans un système de communication sans fil
WO2020159222A1 (fr) Procédé et dispositif d'activation et de désactivation par liaison permettant de réduire la consommation d'énergie dans un système de communication mobile de prochaine génération
WO2022182172A1 (fr) Procédé et appareil pour une procédure de radiomessagerie dans un système de communication sans fil
WO2016144055A1 (fr) Procédé et appareil pour réaliser et relever des mesures à l'aide d'équipement utilisateur configuré par des porteuses multiples dans des systèmes de communication mobile
WO2018174653A1 (fr) Procédé de transmission ou de réception de signaux dans un système de communication sans fil et appareil associé
WO2021261877A1 (fr) Procédé et dispositif d'émission et de réception d'un signal dans un système de communication sans fil
WO2019194531A1 (fr) Procédé d'émission ou de réception de signal dans un système de communication sans fil et dispositif associé
WO2019190236A1 (fr) Procédé de transmission de signal de référence de sondage (srs) dans un système de communication sans fil et appareil associé
WO2018016921A1 (fr) Procédés destinés à la transmission et à la réception d'informations de commande de liaison descendante entre station de base et terminal dans un système de communication sans fil, et dispositifs destinés à prendre en charge lesdits procédés
WO2018203680A1 (fr) Procédé d'émission et de réception de signal au moyen d'un faisceau dans un système de communication sans fil, et appareil pour ledit procédé
WO2021177782A1 (fr) Procédé et dispositif de transmission ou de réception de signal sur la base d'un paramètre d'espace dans un système de communication sans fil
WO2019027273A1 (fr) Procédé de commande de puissance de transmission dans un système de communication sans fil, et appareil correspondant
WO2019190173A1 (fr) Procédé d'émission et de réception de signaux et/ou de canaux physiques dans un système de communication sans fil et appareil à cet effet
WO2021261853A1 (fr) Procédé et appareil d'émission et de réception d'un signal dans un système de communication sans fil
WO2021154020A1 (fr) Procédé et appareil d'émission et de réception d'informations d'état de canal dans un système de communication sans fil
WO2019212246A1 (fr) Procédé et dispositif pour l'exécution d'un positionnement dans un réseau new radio
WO2020009498A1 (fr) Procédé de transmission de données de liaison montante dans une bande sans licence et dispositif associé
WO2021251693A1 (fr) Procédé et dispositif de transmission ou de réception de signal de référence de sondage dans un système de communication sans fil
WO2024237624A1 (fr) Procédé et appareil pour économiser l'énergie dans un système de communication sans fil
WO2024237529A1 (fr) Procédé et appareil permettant d'effectuer une transmission et une réception en liaison descendante dans un système de communication sans fil
WO2019198994A1 (fr) Procédé et dispositif pour effectuer une localisation dans un réseau sans fil de prochaine génération
WO2024091047A1 (fr) Procédé et dispositif de gestion de modèle dans une gestion de faisceau à l'aide de l'intelligence artificielle et de l'apprentissage automatique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19772391

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19772391

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 19772391

Country of ref document: EP

Kind code of ref document: A1