KR20190111767A - Methods for performing a communication of User Equipment and Apparatuses thereof - Google Patents

Abstract

The present disclosure discloses a technique for a terminal to efficiently communicate with a base station in various environments. According to an embodiment of the present invention, a method of a terminal for performing a discontinuous reception (DRX) operation comprises the steps of: receiving an RRC message including a plurality of DRX configurations from a base station; receiving a MAC control element (MAC CE) or L1 signaling indicating a change in the DRX configuration from the base station; and applying DRX using a DRX configuration indicated by the MAC CE or L1 signaling among the plurality of DRX configurations.

Description

Method for performing communication with a terminal and a device therefor {Methods for performing a communication of User Equipment and Apparatuses}

The present disclosure discloses a technique for the terminal to efficiently communicate with the base station in various environments.

The next generation mobile communication technology is being researched according to the demand for large data processing and high speed data processing. For example, in the current mobile communication systems such as Long Term Evolution (LTE), LTE-Advanced, 5G, etc. of the 3GPP series, a high-speed large-capacity communication system capable of transmitting and receiving various data such as video and wireless data, beyond voice-oriented services This is required.

In accordance with this demand, as 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. In order to reduce power consumption of the terminal, a change in a transmission / reception band, a bandwidth part (BWP), and a DRX configuration of the connection state terminal is required.

In particular, when the terminal does not transmit or receive data, a reduction in standby power is required, and in order to satisfy various 5G requirements, a change to the DRX configuration is also required.

Meanwhile, when the terminal configures carrier aggregation, 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. In particular, 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.

In the above background, the present disclosure proposes an efficient DRX application operation that can reduce power consumption of a terminal.

In addition, the present disclosure proposes a method for determining a BWP to be applied when the secondary cell transitions to a dormant state.

In order to solve the above-mentioned problems, 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 .

In addition, according to an embodiment, in a method of changing a state of a secondary cell by a terminal, 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 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 and changing the state of the secondary cell to the dormant state based on the MAC control element, A method includes determining a BWP of a secondary cell.

In addition, according to an embodiment of the present invention, a method of controlling a DRX (Discontinuous Reception) operation of a terminal, the method 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. Provides a way to apply DRX using configuration.

In addition, according to an embodiment, in a method of changing a secondary cell state of a terminal by a base station, 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.

In addition, according to an embodiment, 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. Or 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.

In addition, 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.

In addition, 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. Provides a base station apparatus applying DRX using the configuration.

In addition, 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 A transmitting unit and a control unit for determining to change the secondary cell state of the terminal from the active state to the dormant state (Dormant State), including the transmitter, the transmitter, the MAC for changing the state of the secondary cell from the active state to the dormant state to the terminal 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.

In addition, the present disclosure provides an effect of allowing a fast state transition while reducing power consumption even when configuring a secondary cell.

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.
2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.
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.
5 is a diagram for describing a field of conventional DRX configuration information.
6 is a diagram illustrating a DRX application operation of a terminal according to an embodiment.
7 is a diagram for explaining an operation of applying a DRX of a terminal according to another embodiment.
8 is a diagram for describing a DRX configuration included in an RRC message according to an embodiment.
9 is a diagram for explaining a DRX configuration included in an RRC message according to another embodiment.
10 is a diagram illustrating an operation of a base station for controlling a DRX operation of a terminal according to an embodiment.
11 is a diagram illustrating a state change of a secondary cell, according to an exemplary embodiment.
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.
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.
16 illustrates a configuration of a base station according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are shown in different drawings. In addition, in describing the technical idea, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the exemplary embodiments, terms such as 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.

In addition, terms and technical names used in the present specification are for explaining a specific embodiment, and technical ideas are not limited to the terms. Unless otherwise defined, the terms described below may be interpreted as meanings generally understood by those skilled in the art to which the technical idea belongs. When the term is an incorrect technical term that does not accurately express the technical idea, it should be replaced with a technical term that can be understood by those skilled in the art. In addition, the general terms used herein should be interpreted as defined in the dictionary, or according to the context before and after, and should not be interpreted in an excessively reduced sense.

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. For example, 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). It can be applied to various radio access technologies, such as. 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). 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. As such, 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 currently under development or will be developed in the future.

Meanwhile, 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), of course, 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. In addition, 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. In addition, in the case of 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.

Since the various cells listed above have a base station for controlling each cell, 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.

In the present specification, 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 (UL, or uplink) means a method for transmitting and receiving data to the base station by the terminal, 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, and the uplink may mean a communication or communication path from a terminal to multiple transmission / reception points. In this case, in the downlink, the transmitter may be part of multiple transmission / reception points, and the receiver may be part of the terminal. In addition, in uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.

The uplink and the 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. Hereinafter, 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.

For clarity, the following description focuses on the 3GPP LTE / LTE-A / NR (New RAT) communication system, but the technical features are not limited thereto.

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. .

In order to satisfy this scenario, NR discloses a wireless communication system using a new waveform and frame structure technology, low latency technology, mmWave support technology, and forward compatible technology. In particular, 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.

<NR system general>

1 is a diagram schematically illustrating a structure of an NR system to which the present embodiment may be applied.

Referring to FIG. 1, 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. 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.

<NR waveform, pneumatic and frame structure>

In NR, 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.

On the other hand, in NR, since the requirements for data rate, delay rate, and coverage are different for each of the three scenarios described above, it is necessary to efficiently satisfy the requirements for each scenario through a frequency band constituting an arbitrary NR system. . To this end, a technique for efficiently multiplexing a plurality of different numerology-based radio resources has been proposed.

값이 2의 지수 값으로 사용되어 지수적으로 변경된다.Specifically, 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.

Subcarrier spacing Cyclic prefix Supported for data Supported for synch 0 15 Normal Yes Yes One 30 Normal Yes Yes 2 60 Normal, Extended Yes No 3 120 Normal Yes Yes 4 240 Normal No Yes

As shown in Table 1, 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. On the other hand, 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. In the case of a 15khz subcarrier interval, 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.

Referring to FIG. 2, 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. For example, 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. On the contrary, 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.

Meanwhile, 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.

In addition, unlike LTE, NR defines uplink and downlink resource allocation at a symbol level in one slot. In order to reduce the HARQ delay, 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. In addition, 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). 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.

<NR Physical Resource>

With regard to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, bandwidth parts, etc. are considered Can be.

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. Here, the broad characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.

Referring to FIG. 3, since the Resource Grid supports a plurality of numerologies in the same carrier, a resource grid may exist according to each numerology. In addition, 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. In addition, 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. In addition, 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.

In NR, unlike LTE, where the carrier bandwidth is fixed at 20Mhz, the maximum carrier bandwidth is set from 50Mhz to 400Mhz for each subcarrier interval. Therefore, it is not assumed that all terminals use all of these carrier bandwidths. Accordingly, in the NR, as shown in FIG. 4, the bandwidth part can be designated within the carrier bandwidth and used by the terminal. In addition, 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.

In the case of paired spectrum, 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. For this purpose, 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. In particular, as 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. In 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. According to some data, more than 60% of the energy of the UE is consumed in PDCCH blind decoding having no scheduling grant in the RRC CONNECTED mode. In addition, 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.

In particular, a lot of power is consumed to monitor the PDCCH of the terminal, unnecessary power is consumed to monitor the PDCCH not associated with the actual terminal. In order to solve this problem, 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. For example, 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.

5 is a diagram for describing a field of conventional DRX configuration information.

Referring to FIG. 5, 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. For example, 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. When the UE is in the RRC CONNECTED state, if DRX is configured, 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. For example, 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). For example, 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. For example, 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. For example, 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 (optional): indicates a short DRX cycle.

drx-ShortCycleTimer (optional): the duration the UE shall follow the Short DRX cycle

drx-HARQ-RTT-TimerDL (per DL HARQ process): the minimum duration before a DL assignment for HARQ retransmission is expected by the MAC entity To indicate.

drx-HARQ-RTT-TimerUL (per UL HARQ process): indicates the minimum duration before a UL HARQ retransmission grant is expected by the MAC entity. .

When one DRX cycle is configured in the UE, 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).

When DRX is configured in the terminal, the MAC entity of the terminal should operate as follows.

1> If drx-HARQ-RTT-TimerDL expires ( if a drx-HARQ-RTT-TimerDL expires):

2> If the data of the corresponding HARQ process was not successfully decoded:

3> The MAC entity starts the drx-RetransmissionTimerDL for the corresponding HARQ process.

1> If drx-HARQ-RTT-TimerUL expires (if an drx-HARQ-RTT-TimerUL expires):

2> The MAC entity starts the drx-RetransmissionTimerUL for the corresponding HARQ process.

1> If a DRX Command MAC CE or a Long DRX Command MAC CE is received:

2> MAC entity to stop the drx-onDurationTimer (stop drx-onDurationTimer );

2> Also, the MAC object has drx-InactivityTimer Stop ( drx-InactivityTimer) .

1> If drx-InactivityTimer expires or a DRX Command MAC CE is received:

2> If the Short DRX cycle is configured:

3> MAC entity is started or restarted, the drx-ShortCycleTimer (start or restart drx -ShortCycleTimer);

3> The MAC entity uses the Short DRX Cycle.

2> If a short DRX cycle is not configured (else):

3> MAC entities use the Long DRX cycle.

1> If drx-ShortCycleTimer expires (if drx-ShortCycleTimer expires):

2> MAC entities use the Long DRX cycle.

1> If a Long DRX Command MAC CE is received:

2> MAC entity to stop the drx-ShortCycleTimer (stop drx-ShortCycleTimer );

2> MAC entities use the Long DRX cycle.

1> if the Short DRX Cycle is used, [(SFN * 10) + subframe number] modulo ( drx-ShortCycle ) = ( drx-StartOffset ) modulo ( drx-ShortCycle ); or

1> If the Long DRX Cycle is used, then [(SFN * 10) + subframe number] modulo ( drx-LongCycle ) = satisfies drx-StartOffset :

2> If drx -SlotOffset is configured:

3> MAC entity discloses a drx-onDurationTimer after drx-SlotOffset (start drx-onDurationTimer after drx-SlotOffset).

2> If drx-SlotOffset is not configured (else):

3> The MAC entity starts drx-onDurationTimer (start drx-onDurationTimer ).

1> If the MAC entity is in Active Time:

2> The MAC entity monitors the PDCC;

2> If the PDCCH indicates a DL transmission or if a DL assignment has been configured:

3> the MAC entity starts the drx-HARQ-RTT-TimerDL for the corresponding HARQ process immediately after the corresponding PUCCH transmission;

3> MAC entity to stop the drx-RetransmissionTimerDL for the HARQ process associated (stop the drx-RetransmissionTimerDL for the corresponding HARQ process).

2> If the PDCCH indicates a UL transmission or if a UL grant is configured (if the PDCCH indicates a UL transmission or if a UL grant has been configured):

3> The MAC entity starts the drx-HARQ-RTT-TimerUL for the corresponding HARQ process immediately after the first repetition of the corresponding PUSCH transmission);

3> MAC entity to stop the drx-RetransmissionTimerUL for the HARQ process associated (stop the drx-RetransmissionTimerUL for the corresponding HARQ process).

2> If the PDCCH indicates a new transmission (DL or UL):

3> MAC entity is started or restarted, the drx-InactivityTimer (start or restart drx -InactivityTimer).

1> If the terminal is not within the active time (else (i.e. not part of the Active Time)):

2> MAC entity does not report CQI / PMI / RI on PUCCH (not report CQI / PMI / RI on PUCCH).

As described above, in the conventional communication technology, the base station configures one DRX configuration information in the terminal, and the DRX operation was performed in 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. Alternatively, each embodiment may be applied to an LTE terminal linked to an LTE base station. Alternatively, each embodiment may be applied to an LTE terminal connecting to an eLTE base station connected through a 5G system (or 5G Core Network). Alternatively, 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.

6 is a diagram illustrating a DRX application operation of a terminal according to an embodiment.

Referring to FIG. 6, in a method of performing a DRX operation, the terminal may perform a step of receiving an RRC message including a plurality of DRX configurations from a base station (S600).

For example, 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. For example, the DRX configuration information may include the aforementioned DRX parameters, and the plurality of DRX configuration information may include DRX parameters, respectively. As another example, 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.

Meanwhile, 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.

For example, 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). For example, 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.

That is, 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.

To this end, 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.

Through this, the terminal may dynamically change the DRX configuration according to the instruction of the base station to perform a more efficient DRX operation. In addition, according to 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.

However, the above-described operation is that 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.

7 is a diagram for explaining an operation of applying a DRX of a terminal according to another embodiment.

Referring to FIG. 7, 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).

As an example, when the DRX index information is allocated to each of the plurality of DRX configurations, the terminal may transmit the DRX index information that the terminal prefers or expects to apply to the base station at any time.

As another example, 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.

As another example, 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.

Although 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.

Through the operation of the terminal described above, the terminal may select one of the plurality of DRX configurations and perform a DRX operation. In addition, 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. In addition, in order to reflect the request of the terminal, the terminal may transmit information indicating a specific DRX configuration to the base station.

Hereinafter, each operation will be described separately for the above-described DRX configuration operation, and detailed embodiments of each operation will also be described. The individual embodiments described below can be performed individually or in combination / combination.

Configuring a plurality of DRX configuration information in the terminal through RRC signaling

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).

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. Through this, the terminal may receive DRX configuration information to be applied to the terminal from the base station.

8 is a diagram for describing a DRX configuration included in an RRC message according to an embodiment.

Referring to FIG. 8, one or more different DRX configuration information included in an RRC message may be indicated through SEQUENCE {}. In this case, different DRX configuration information may be distinguished / identified through a DRX index (eg, drx-configId). When 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). Alternatively, 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). In this case, different DRX configuration information may be distinguished / identified through DRX-Config ID / Index / Identifier / Number / Delimiter (for example, drx-configId). In the DRX configuration list, a value of 1 represents the first entry, a value of 2 represents the second entry, and subsequent order values indicate the entry in the same manner. Alternatively, in the DRX configuration list, value 0 may indicate the first entry, value 1 may indicate the second entry, and subsequent order values may indicate the corresponding entry in the same manner.

For example, 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.

As another example, different DRX configuration information may be configured such that one or more information elements described above have different values.

As another example, 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.

As another example, 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.

As another example, 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.

As another example, when the UE receives an RRC message including one or more DRX configurations, 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.

As another example, 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. When 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.

As another example, 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).

As another example, 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.

As another example, 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.

Embodiment for distinguishing common DRX configuration information commonly included in a plurality of DRX configurations and dedicated DRX configuration information included in specific DRX configuration information in order to efficiently provide RRC signaling

When indicating one or more DRX configuration information to the UE, 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. For efficient data transmission, 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.

9 is a diagram for explaining a DRX configuration included in an RRC message according to another embodiment.

Referring to FIG. 9, 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.

For example, 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.

For example, 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.

As another example, when common DRX configuration information commonly included in one or more DRX configuration information is indicated, a specific DRX configuration having a specific DRX index (for example, drx-configId) 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.

As another example, 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. At this time, different subDRX configuration information can be distinguished / identified through DRX-Config ID / Index / Identifier / Number / Delimiter (eg drx-configId).

As another example, when common DRX configuration information commonly included in one or more DRX configuration information is indicated, a specific DRX configuration having a specific DRX index (eg, drx-configId) includes an information element commonly included and configured May be In this case, 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.

In the above description for the convenience of description, the operation of a specific parameter, but the operation of any information element included in the DRX configuration is included in the scope of the present disclosure.

Dynamic DRX Configuration Switching Embodiment Between Multiple DRX Configurations with MAC CE or L1 Signaling

As described above, when one or more DRX configuration information is configured in the terminal, 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.

For example, the switching indication between DRX configurations may be provided through a MAC CE. For example, 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. Therefore, 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. As another example, 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.

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.

In contrast, the UE performs a DRX operation using an onduration timer of the DRX configuration indicated in the next DRX cycle.

Meanwhile, information indicating DRX configuration switching may be delivered through a PDCCH or an arbitrary L1 signal based on a sequence. For example, 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.

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

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.

For another example, 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. Or, the terminal restarts the drx-InactivityTimer of the indicated DRX configuration. Or, the terminal switches to the drx-InactivityTimer value of the indicated DRX configuration to start the drx-InactivityTimer. Unlike this, the UE performs a DRX operation using the drx-InactivityTimer of the DRX configuration indicated in the next DRX cycle.

10 is a diagram illustrating an operation of a base station for controlling a DRX operation of a terminal according to an embodiment.

Referring to FIG. 10, in a method of controlling a DRX (Discontinuous Reception) operation of a terminal, the base station may perform a step of transmitting an RRC message including a plurality of DRX configurations to the terminal (S1000). For example, 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.

Alternatively, 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.

If necessary, 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.

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.

Through this, the terminal may dynamically change the DRX configuration according to the instruction of the base station to perform a more efficient DRX operation. In addition, according to 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.

As described above, according to the present disclosure, 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.

Meanwhile, in order to prevent power consumption of the terminal, an operation of determining the BWP of the SCell when the terminal configures carrier aggregation will be described.

Carrier Aggregation (CA) technology is a technology for boosting a data rate to a terminal through an additional cell in addition to the primary cell (PCell). Conventional CA technology has not been optimized in terms of delay or power consumption in configuring and activating a secondary cell.

The CA configuration operation will be briefly described below.

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. When the terminal 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. When the SCell is configured, the SCell is configured in a deactivated state.

Thereafter, 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.

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) The UE may reduce power consumption according to the above-described operation with respect to the deactivated SCell.

If the secondary cell is activated, normal secondary cell operation (SRS transmissions on the SCell, CQI / PMI / RI / PTI / CRI reporting for the SCell, PDCCH monitoring on the SCell, PDCCH monitoring for the SCell, PUCCH transmission on the SCell) is performed.

As described above, MAC CE (control element) may be used to activate the SCell. For example, 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.

When the UE receives an activation command for the secondary cell in subframe n, 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 :)

Items to be applied to subframe n + 8 are as follows.

The actions related to CSI reporting on a serving cell which is active in subframe n + 8

The actions related to the sCellDeactivationTimer associated with the secondary cell, which should be applied to n + 8 subframes. (which shall be applied in subframe n + 8.)

The actions related to CSI reporting on a serving cell which is not active in subframe n + 8, which is the n + 8 sub where the serving cell is active. It should be applied to the fastest subframe after the frame. (which shall be applied in the earliest subframe after n + 8 in which the serving cell is active)

The minimum requirements defined in the relevant 3GPP TS 36.133 are as follows.

For the SCell activation delay requirement, if the UE sends a valid measurement report for a period such as max (5 measCycleSCell, 5 DRX cycles) before receiving the SCell activation command and it is later than subframe n + 24 if the SCell remains detectable Otherwise, the terminal should be able to apply the operation not later than subframe n + 34. (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:

- During the period equal to max (5 measCycleSCell, 5 DRX cycles) before the reception of the SCell activation command:

- the UE has sent a valid measurement report for the SCell being activated and

- the SCell being activated remains detectable according to the cell identification conditions specified in section 8.3.3.2,

- SCell being activated also remains detectable during the SCell activation delay according to the cell identification conditions specified in section 8.3.3.2.

Otherwise upon receiving the SCell activation command in subframe n, 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.)

As such, there has been a significant delay before the UE receives the MAC CE indicating SCell activation to transmit data through the SCell. In other words, effective data scheduling based on valid CQI reporting took 24 ~ 34ms.

When the deactivated SCell is activated, the UE performs RF retuning, initial CQI measurement, and CQI reporting. As 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. Alternatively, by defining a new state that does not perform (or suspend) some of the active state-induced power-consuming operations, the SCell can be quickly switched to the active state to transmit data. However, 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.

In addition, 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. (With Bandwidth Adaptation (BA), 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.)

As described above, the conventional CA technology does not support the detailed technology for the SCell state to support fast SCell usage and / or power consumption reduction. In particular, there was a problem that 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.

In this situation, 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.

In the following description, for convenience of understanding, it will be described based on NR radio access technology. However, this is for convenience only and the present disclosure may be applied to LTE or another wireless access network. In the following description, well-known techniques will be omitted for explanation. Omitted descriptions or some information elements shall refer to information elements specified in TS 38.331, which is an RRC specification. In addition, with respect to terminal operation, some terminal operations include operations specified in TS 38.321, which is a MAC standard. Although the contents of the terminal operation related to the definition of the corresponding information element are not included in the present specification, the contents may be used in the present disclosure or may be included in the claims.

For the sake of understanding, the BWP operation in NR will first be briefly described.

If the terminal is configured with a SCG (Secondary Cell Group), 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

- When the procedures are applied for MCG, 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 .

- When the procedures are applied for SCG, 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). (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.)

For operation on the primary cell, the terminal is provided with an initial uplink BWP for the random access procedure by higher layer parameters. (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.)

If the terminal is configured with a secondary carrier, 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.)

For unpaired spectrum operation, 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.)

For each DL BWP or UL BWP, the terminal is configured with the following parameters for its serving cell.

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]:

- A subcarrier spacing provided by higher layer parameter DL-BWP-mu or UL-BWP-mu;

- A cyclic prefix provided by higher layer parameter DL-BWP-CP or UL-BWP-CP;

- A number of contiguous PRBs provided by higher layer parameter DL-BWP-BW or UL-BWP-BW provided by higher layer parameter DL-BWP-BW or UL-BWP-BW;

- An index within a set of DL BWPs or UL BWPs by respective higher layer parameter DL-BWP-index or UL-BWP-index for paired spectral operation, or link ratio layer 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 of PDSCH reception timing by higher layer parameter DL-data-time-domain, PDSCH reception of HARQ-ACK transmission timing value by higher layer parameter DL-data-DL-acknowdedgement, DCI higher layer 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);

- An offset of the first PRB of the DL bandwidth or the UL bandwidth of a DL bandwidth or a UL bandwidth for a first PRB of bandwidth by a higher layer parameter DL-BWP-loc or UL-BWP-loc, respectively, relative to a first PRB of a bandwidth by higher layer parameter DL-BWP-loc or UL-BWP-loc)

- For the downlink of the primary cell, the first PRB of the bandwidth is for the downlink of the primary cell, the first PRB of the bandwidth is the of the SS / PBCH block used by the UE for initial cell selection. first RPB of the SS / PBCH block used by the UE for initial cell selection);

- For the uplink of the primary cell for paired spectrum operation, 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);

- For the uplink of unpaired primary cell, the first PRB of bandwidth is for the uplink of the primary cell for unpaired, the first PRB of the SS / PBCH block used by the UE for initial cell selection. of the bandwidth is the first PRB of the SS / PBCH block used by the UE for initial cell selection);

- For a secondary cell or carrier, the first PRB of the DL bandwidth or the UL bandwidth is indicated to the UE by a 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)

For each DL BWP on the primary cell, the terminal may be configured with a control resource set for all types of common search spaces and terminal specific search spaces. (For each DL BWP in a set of DL BWPs on the primary cell, 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.)

For each UL 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.)

If the BWP indicator field is configured in DCI format 1_1, 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.)

For the primary cell, 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.)

If 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. (If 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.)

If 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. is configured by higher layer parameter Active-BWP-DL-SCell a first active DL BWP and by higher layer parameter Active-BWP-UL-SCell a first active UL BWP on a secondary cell or carrier, 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.)

For paired spectrum operation, if the terminal has changed the active UP BWP, the terminal is not expected to transmit HARQ-ACK. (For paired spectrum operation, 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.)

It is not expected that 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. In addition to a special cell (SpCell) 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. Upon addition of SpCell or activation of a SCell, 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. For unpaired spectrum, a DL BWP is paired with a UL BWP, and BWP switching is common for both UL and DL.)

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:

-Transmit on UL-SCH

On RACH

-PDCCH monitoring

-PUCCH transmission

-SRS transmission

-DL-SCH reception

If present, initiation / restart of any suspended configured grant type1 uplink grant

(On the active BWP for each activated Serving Cell configured with a BWP, the MAC entity shall apply normal operations including:

1> transmit on UL-SCH;

1> transmit on RACH;

1> monitor the PDCCH;

1> transmit PUCCH;

1> transmit SRS;

1> receive DL-SCH;

1> (re-) initialize any suspended configured uplink grants of configured grant Type 1 according to the stored configuration, if any, and to start in the symbol according to rules in subclause TS 38.321 5.8.2.)

When it is an inactive BWP for each activated serving cell configured with one BWP, the MAC entity should operate as follows.

Untransmitted on the UL-SCH

-Not sent on RACH

-PDCCH non-monitoring

-PUCCH not sent

-SRS not sent

DL-SCH not received

-Any configured downlink allocation and configured uplink grant release of configured grant type 2

Suspend of any configured uplink grant of configured grant type1

(On the inactive BWP for each activated Serving Cell configured with a BWP, the MAC entity shall:

1> not transmit on UL-SCH;

1> not transmit on RACH;

1> not monitor the PDCCH;

1> not transmit PUCCH;

1> not transmit SRS;

1> not receive DL-SCH;

1> clear any configured downlink assignment and configured uplink grant of configured grant Type 2;

1> suspend any configured uplink grant of configured Type 1.)

If the MAC entity receives the PDCCH for BWP switching of one serving cell, the MAC entity operates as follows.

If there is no ongoing random access procedure associated with this serving cell or if the ongoing random access procedure associated with this serving cell is successfully completed upon reception of PDCCH, BWP switching is performed with the BWP indicated in the PDCCH.

(If the MAC entity receives a PDCCH for BWP switching of a serving cell, the MAC entity shall:

1> if there is no ongoing Random Access procedure associated with this Serving Cell; or

1> if the ongoing Random Access procedure associated with this Serving Cell is successfully completed upon reception of this PDCCH addressed to C-RNTI (as specified in subclauses 5.1.4 and 5.1.5):

2> perform BWP switching to a BWP indicated by the PDCCH.)

If the BWP Inactivity Timer is configured, then the MAC entity, for each activated serving cell,

If 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

If no default DL BWP is configured and the active DL BWP is not the initial BWP,

If a PDCCH addressed with a C-RNTI or CS-RNTI indicating downlink allocation or uplink grant is received on the active BWP, or

If a weak MAC PDU is sent to the configured uplink grant or received in the configured downlink assignment,

If there is no ongoing random access procedure associated with this serving cell, or

If the ongoing random access procedure associated with this serving cell completes successfully upon reception of the PDCCH addressed by the C-RNTI,

Starts or restarts the BWP Inactivity Timer associated with the active DL BWP.

If the PDCCH for BWP switching is received on the active DL BWP, and if the MAC entity switches the active BWP,

Starts or restarts the BWP Inactivity Timer associated with the active DL BWP.

If a random access procedure is initiated on this serving cell,

The BWP inactivity timer associated with the active DL BWP of this serving cell is stopped.

If 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.

If the BWP Inactivity Timer associated with the active DL BWP expires,

If the default DL BWP is configured

Perform BWP switching with the BWP indicated by the default DL BWP.

otherwise

Perform BWP switching with initial DL BWP.

(If the bwp-InactivityTimer is configured, the MAC entity shall for each activated Serving Cell:

1> if the default-DL-BWP is configured, and the active DL BWP is not the BWP indicated by the default-DL-BWP; or

1> if the default-DL-BWP is not configured, and the active DL BWP is not the initial BWP:

2> if a PDCCH addressed to C-RNTI or CS-RNTI indicating downlink assignment or uplink grant is received on the active BWP; or

2> if a MAC PDU is transmitted in a configured uplink grant or received in a configured downlink assignment:

3> if there is no ongoing random access procedure associated with this Serving Cell; or

3> if the ongoing Random Access procedure associated with this Serving Cell is successfully completed upon reception of this PDCCH addressed to C-RNTI (as specified in subclauses 5.1.4 and 5.1.5):

4> start or restart the bwp-InactivityTimer associated with the active DL BWP.

2> if a PDCCH for BWP switching is received on the active DL BWP, and the MAC entity switches the active BWP:

3> start or restart the bwp-InactivityTimer associated with the active DL BWP.

2> if Random Access procedure is initiated on this Serving Cell:

3> stop the bwp-InactivityTimer associated with the active DL BWP of this Serving Cell.

3> if the Serving Cell is SCell (other than PSCell):

4> stop the bwp-InactivityTimer associated with the active DL BWP of SpCell, if running.

2> if the bwp-InactivityTimer associated with the active DL BWP expires:

3> if the default-DL-BWP is configured:

4> perform BWP switching to a BWP indicated by the default-DL-BWP.

3> else:

4> perform BWP switching to the initial DL BWP.)

For convenience of explanation, 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. However, this is only for convenience of description and the use of any other name to serve the same purpose / function is included in the present disclosure. For example, the 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.

That is, 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. Alternatively, the SCell may indicate a state of transitioning from an inactive state to an activated state. Or 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.

For example, 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.

As another example, 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)). CSI Reporting) and does not perform PDCCH monitoring.

Here, 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. Can be.

As another example, the dormant SCell follows the DRX of the PCell / PSCell for triggering the channel status report / RRM measurement report.

As another example, 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.

As another example, 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.

Each of the methods described below can be provided individually or in combination.

SCell Configuration and State Transition

11 is a diagram illustrating a state change of a secondary cell, according to an exemplary embodiment.

Referring to FIG. 11, the SCell may transition from the activated state 1110 to the deactivated state 1130. Alternatively, the SCell may transition from the deactivated state 1130 to the activated state 1110. Alternatively, the SCell may transition from the activated state 1110 to the dormant state 1120. Alternatively, the SCell may transition from the sleep state 1120 to the activation state 1110. Alternatively, the SCell may transition from the deactivated state 1130 to the dormant state 1120. Alternatively, the SCell may transition from the sleep state 1120 to the inactive state 1130. As described above, the sleep state 1120 may be replaced with various names in arbitrary terms set for convenience of description.

For example, the base station can transition the state of a specific SCell through the MAC CE. For example, 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. For example, the activated SCell 1110 may transition to the sleep state 1120 when the SCell dormant timer expires.

Hereinafter, a state change operation of the SCell configured in the terminal will be described.

The base station may change the SCell configured in the terminal to the dormant state.

For example, when the base station adds / configures the SCell to the terminal, 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. 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.

For another example, the base station may instruct the terminal to configure the SCell configured in an inactive state into a dormant state.

For another example, the base station may instruct the terminal to configure the SCell in the dormant state when adding / configuring the SCell.

On the other hand, when 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.

12 is a diagram for describing an operation of determining, by a terminal, a BWP of a secondary cell according to an embodiment.

Referring to FIG. 12, in a method of changing a state of a secondary cell, the terminal 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).

For example, 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. Alternatively, 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.

In addition, 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. Alternatively, the BWP information may include CSI-RS configuration information applied to the BWP. Alternatively, 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).

For example, 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. For example, the MAC CE may indicate a state change of a specific secondary cell in a bitmap format. As another example, 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.

In addition, the state change of the secondary cell through the MAC CE will be described in more detail below.

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). 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.

For example, if the secondary cell is changed to the dormant state based on the dormant state first BWP information included in the RRC message, the terminal may determine the BWP of the secondary cell as the dormant state first BWP. To this end, 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.

As another example, when the secondary cell changes to the dormant state based on the first BWP information included 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.

As another example, if the secondary cell changes to the dormant state based on the default BWP information included in the RRC message, the terminal may determine the BWP of the secondary cell as the default BWP. That is, the RRC message may include default BWP information. When the secondary cell changes to the dormant state, the terminal may determine the secondary cell BWP in the dormant state as the default BWP without considering the BWP in the activated state.

As another example, the UE may determine whether to change the BWP when the secondary cell changes to the dormant state using a timer. For example, the RRC message may include a BWP Inactivity Timer. When the state of the secondary cell changes to the dormant state, 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. In contrast, when the secondary cell is changed to the dormant state, but the BWP inactivity timer has not expired, 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.

On the other hand, when the state of the secondary cell is changed to the dormant state, the terminal may change the BWP applied in the activated state to the inactive state.

As described above, when the state of the secondary cell changes to the dormant state, the terminal may determine the BWP by various methods.

Hereinafter, each of the above-described embodiments will be described in more detail, and the individual embodiments described below may be applied independently or in combination.

1) Embodiment in which first BWP for sleep state is indicated through RRC message

If the corresponding SCell is in the dormant state, 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.

Accordingly, the UE needs to more efficiently process power consumed when performing CSI-RS measurement for channel state reporting in the dormant state. To this end, 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.

For example, when the SCell transitions to the dormant state, 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. .

As another example, if the first BWP is configured to be applied when the SCell transitions to the dormant state through the upper layer information element (first BWP configuration information when the SCell transitions to the dormant state), the terminal sleeps the indicated first BWP. Use as the first downlink BWP on the state secondary cell. Or first BWP to be applied when the SCell transitions to the dormant state through an upper layer information element (first BWP configuration information to be applied when the SCell transitions to the dormant state and / or associated CSI-RS configuration information) to the terminal If the associated CSI-RS configuration information is configured, 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. do

As such, the terminal may apply the dormant state first BWP or CSI-RS configuration information configured through the RRC message to the dormant secondary cell. In addition, 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. 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.

2) Embodiment of using an active SCell first active BWP as a first BWP for a dormant state

If the corresponding SCell is in the dormant state, 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. However, since the SCell performs channel state reporting even in the dormant state, it consumes more power than the deactivation state.

In order to power-efficiently process CSI-RS measurement for channel state reporting in the dormant state, the base station (DL) BWP and / or its associated CSI-RS configuration (or CSI-RS) when the SCell transitions to the dormant state The measurement configuration (CSI-MeasConfig) may be indicated to the terminal through an RRC connection reconfiguration message.

For example, 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.

As another example, 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.

As another example, if the first active DL BWP applied when the SCell is activated through the upper layer information element (first active DL BWP applied when the SCell is activated and / or CSI-RS configuration information associated with it) And / or CSI-RS configuration information associated with the UE, 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)).

That is, 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. 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.

3) Example of Switching to Default DL BWP

If the corresponding SCell is in the dormant state, 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.

In order to power-efficiently process CSI-RS measurement for channel state reporting in the dormant 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 (CSI-MeasConfig) can be switched efficiently.

For example, 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.

As another example, if the UE is configured with a default DL BWP through higher layer information elements (ex, Default-DL-BWP, defaultdwonlinkBWP-Id), and the UE supports the SCell dormancy state, the UE sleeps the indicated Default DL BWP. Use as the first downlink BWP on the state secondary cell.

In another example, if 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.

On the other hand, if a default downlink BWP (Default-DL-BWP) is not separately provided to the terminal by a higher layer, the initial active downlink BWP may be used as the Default-DL-BWP described in the above embodiments.

4) Embodiment of Maintaining Active BWP Until BWP Inactivity Timer Expires

If the corresponding SCell is in the dormant state, 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.

On the other hand, 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. Thus, in this case, power consumption may not increase significantly.

Therefore, when an arbitrary BWP other than the default BWP has been previously instructed in the SCell and is being used as the active BWP, the active BWP may be maintained without changing the BWP even when the terminal transitions to the dormant state. When the SCell 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.

For example, when the state of the secondary cell changes from the active state to the dormant state, 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.

For another example, when the state of the secondary cell changes from the active state to the dormant state, the terminal may maintain the current active BWP. For another example, when the state of the secondary cell changes from the human state to the active state, the terminal may maintain the current active BWP.

5) Example of Deactivating an Active BWP

If the corresponding SCell is in the dormant state, 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. 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.

For example, when the SCell transitions to the dormant state, the terminal deactivates the active BWP and / or the CSI-RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the SCell.

As another example, when the SCell transitions to the dormant state, the terminal switches the active BWP and / or CSI-RS configuration (or CSI-RS measurement configuration (CSI-MeasConfig)) associated with the SCell.

As another example, when the SCell transitions to the dormant state, 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.

As another example, when the SCell transitions to the dormant state, the terminal stops the BWP inactivity timer of the corresponding SCell.

Through the embodiments described above, 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.

In addition, the above-described embodiments may be equally applied to the CSI-RS configuration switching operation. To this end, 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.

Hereinafter, the sleep state transition operation will be described.

If the MAC entity is configured with one or more SCells, the network may activate or deactivate the configured SCells. The network may instruct the configured SCell to configure or transition to a dormant state.

For example, the SCell configured as an example may be controlled to be in an inactive state at the time of addition / configuration or after handover.

As another example, in order to quickly transmit user data through the configured SCell, 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. In this case, the UE may be configured to be activated when the SCell is added / configured or initially after the handover.

As another example, in order to quickly shift the configured SCell to the SCell activation state, the terminal may receive an RRC connection reconfiguration message including information indicating a dormant state for the SCell from the base station. In this case, 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. For example, 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. For another example, 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.

On the other hand, 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. For example, SCell state indication information may be composed of SCellstate ENUMERATE {activate, deactivate, dormant, spare}.

Alternatively, 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. For example, 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.

For example, if an RRC message is received containing information indicating a sleep state for a SCell, or another example, if a MAC CE containing information indicating a sleep state is received for a SCell, or when transitioning to a sleep state. ,

The terminal (MAC entity) 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. Measure and / or report one or more of Channel Quality Indicator (CQI) / precoding matrix indicator / PSI (CSI-RS resource indicator) / strong layer indication (SLI) / rank indication (RI) / L1-RSRP.

For example, the aforementioned CSI-RS configuration information (or CSI measurement 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.

As another example, 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.

If the SCell deactivation timer (sCellDeactivationTimer) associated with the dormant SCell is in operation, 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.

In addition, the terminal performs the above-described BWP switching and / or CSI-RS configuration (CSI measurement configuration) switching operation. In addition, the terminal may stop the aforementioned BWP inactivity timer and / or perform CSI-RS configuration (CSI measurement configuration) switching.

Hereinafter, the MAC CE indicating the SCell state transition will be described in more detail.

For example, 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.

Referring to FIG. 13, as an example, 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.

If the length field / bit is set to "1", it 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).

For example, if the length field / bit is set to "1", it 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.

A case in which the length field / bit consists of two bits will be described. The length field / bit may have four values of 00, 01, 10, and 11. Through this, 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. For example, if 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.

Hereinafter, the CSi field will be described.

For example, 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.

As another example, 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.

On the other hand, an extension field may be used as another example of using the above-described length field / bit.

For example, 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. For example, 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.

For example, if 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.

For example, if 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.

Meanwhile, as another example, 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. As another example, 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.

Alternatively, the MAC control element (MAC CE) 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. Specifically, 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.

For example, 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. As another example, 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.

Alternatively, 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. Herein, 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.

For example, only values of fields C1, C3, and C5 will be described as an example. It is assumed that SCell index 1 (C1) is inactive at the time of receiving the corresponding MAC CE, SCell index 3 (C3) is dormant, and 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.

When the UE receives the MAC CE, 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.

For example, 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.

As another example, 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.

As another example, when the index field value for the secondary cell is set to a value (eg, “1”) indicating the dormant state, 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.

As such, 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. However, as described above, 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.

14 is a diagram for describing an operation of determining, by a base station, a BWP of a secondary cell according to an embodiment.

Referring to FIG. 14, in a method of changing a secondary cell state of a terminal, the base station 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).

For example, 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. Alternatively, the BWP information may be transmitted to the terminal instead of being divided into a primary cell or a secondary cell. In this case, the UE can apply the BWP information to the secondary cell.

In addition, 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. Alternatively, the BWP information may include CSI-RS configuration information applied to the BWP. Alternatively, 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).

For example, 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. For example, the MAC CE may indicate a state change of a specific secondary cell in a bitmap format. As another example, 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. In addition, 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.

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.

For example, if the secondary cell is changed to the dormant state based on the dormant state first BWP information included in the RRC message, the terminal may determine the BWP of the secondary cell as the dormant state first BWP. To this end, 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.

As another example, when the secondary cell changes to the dormant state based on the first BWP information included 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.

As another example, if the secondary cell changes to the dormant state based on the default BWP information included in the RRC message, the terminal may determine the BWP of the secondary cell as the default BWP. That is, the RRC message may include default BWP information. When the secondary cell changes to the dormant state, the terminal may determine the secondary cell BWP in the dormant state as the default BWP without considering the BWP in the activated state.

As another example, the UE may determine whether to change the BWP when the secondary cell changes to the dormant state using a timer. For example, the RRC message may include a BWP Inactivity Timer. When the state of the secondary cell changes to the dormant state, 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. In contrast, when the secondary cell is changed to the dormant state, but the BWP inactivity timer has not expired, 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.

As another example, when the state of the secondary cell changes to the dormant state, the UE may change the BWP applied in the activated state to the inactive state.

As described above, 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.

Hereinafter, the configuration of the terminal and the base station for performing the operations of the above-described embodiments will be briefly described again with reference to the drawings.

15 is a diagram illustrating an example of a terminal configuration.

Referring to FIG. 15, 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. Or a receiver 1530 for receiving L1 signaling and a controller 1510 for applying DRX using a MAC control element or a DRX configuration indicated by L1 signaling among a plurality of DRX configurations.

For example, 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. For example, the DRX configuration information may include the aforementioned DRX parameters, and the plurality of DRX configuration information may include DRX parameters, respectively. As another example, 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.

Meanwhile, 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. For example, 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.

To this end, 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.

In addition, 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.

If necessary, the transmitter 1520 may instruct the base station of a specific DRX configuration selected by the terminal among a plurality of stored DRX configurations.

As an example, when DRX index information is allocated to each of the plurality of 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.

As another example, 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.

As another example, 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.

In addition, the 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.

Meanwhile, 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.

For example, 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. Alternatively, the BWP information may be received by the receiver 1530 without being divided into a primary cell or a secondary cell. In this case, the controller 1510 may apply the BWP information to the secondary cell.

In addition, 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. Alternatively, the BWP information may include CSI-RS configuration information applied to the BWP. Alternatively, the BWP information may be included in the CSI-RS configuration information.

In addition, 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. For example, the MAC CE may indicate a state change of a specific secondary cell in a bitmap format. As another example, 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.

When the MAC CE is received from the base station, 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.

For example, when the secondary cell is changed to the dormant state based on the dormant state first BWP information included in the RRC message, the controller 1510 may determine the BWP of the secondary cell as the dormant state first BWP. To this end, 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.

As another example, when the secondary cell changes to the dormant state based on the first BWP information included 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.

As another example, 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.

As another example, the controller 1510 may determine whether to change the BWP when the secondary cell changes to the dormant state by using a timer. For example, the RRC message may include a BWP Inactivity Timer. When the state of the secondary cell changes to the dormant state, 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. In contrast, when the secondary cell is changed to the dormant state, but the BWP inactivity timer has not expired, 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.

In addition, the 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.

16 illustrates a configuration of a base station according to an embodiment.

Referring to FIG. 16, 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.

For example, 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.

Alternatively, 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.

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.

In addition, the 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.

Meanwhile, 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. And 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.

For example, 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. Alternatively, the BWP information may be transmitted to the terminal instead of being divided into a primary cell or a secondary cell. In this case, the UE can apply the BWP information to the secondary cell.

In addition, 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. Alternatively, the BWP information may include CSI-RS configuration information applied to the BWP. Alternatively, 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.

In addition, 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.

In addition, the 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 supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, steps, components, and parts which are not described in order to clearly reveal the present technical spirit of the embodiments may be supported by the aforementioned standard documents. In addition, all terms disclosed herein may be described by the standard documents disclosed above.

The above-described embodiments may be implemented through various means. For example, the embodiments may be implemented by hardware, firmware, software, or a combination thereof.

In the case of a hardware implementation, 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.

In the case of an implementation by firmware or software, 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.

In addition, the terms "system", "processor", "controller", "component", "module", "interface", "model" and "unit" described above generally refer to computer-related entity hardware, hardware and software. May mean a combination, software, or running software. For example, 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. For example, both 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.

The above description and the accompanying drawings are merely illustrative of the technical idea, and a person of ordinary skill in the art may combine, separate, substitute, and substitute the components without departing from the essential characteristics of the present technology. Many modifications and variations, including variations, are possible. Accordingly, the embodiments disclosed herein are not intended to limit the present invention, but to describe the present invention, and the scope of the present invention is not limited thereto. The scope of protection of the technical idea should be interpreted by the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present specification.

Claims (24)

In the method for the terminal performs a DRX (Discontinuous Reception) operation,
Receiving an RRC message comprising a plurality of DRX configurations from a base station;
Receiving a MAC control element (MAC CE) or L1 signaling indicating a change in DRX configuration from the base station; And
And applying DRX using the DRX configuration indicated by the MAC control element or L1 signaling among the plurality of DRX configurations. The method of claim 1,
The RRC message is,
And DRX index information for distinguishing and indicating each of the plurality of DRX configurations. The method of claim 1,
The MAC control element or L1 signaling,
And DRX index information for indicating a DRX configuration to be applied to the terminal among the plurality of DRX configurations. The method of claim 1,
After receiving the RRC message,
And transmitting DRX index information indicating a specific DRX configuration selected by the terminal among the plurality of DRX configurations to the base station. In the method for the terminal to change the state of the secondary cell,
Receiving, from a base station, an RRC message including one or more bandwidth parts (BWP) information for a secondary cell and CSI-RS configuration information associated with the one or more BWPs;
Receiving a MAC control element for changing a state of a secondary cell from an active state to a dormant state from the base station; And
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 method of claim 5,
Determining the BWP of the secondary cell,
And when the secondary cell changes to the dormant state based on the dormant first BWP information included in the RRC message, determining the BWP of the secondary cell as the dormant first BWP. The method of claim 6,
The dormant state first BWP information,
And the activation state first BWP information applied when the secondary cell is in an activation state. The method of claim 5,
Determining the BWP of the secondary cell,
On the basis of default BWP information included in the RRC message, when the secondary cell changes to the dormant state, determining the BWP of the secondary cell as the default BWP. The method of claim 8,
The RRC message is,
The BWP inactivity timer,
Determining the BWP of the secondary cell,
When the secondary cell changes to the dormant state and the BWP inactivity timer expires, the BWP of the secondary cell is determined as the default BWP,
If the BWP inactivity timer has not expired, maintaining the BWP of the secondary cell as the BWP in the activated state. The method of claim 5,
Determining the BWP of the secondary cell,
And when the secondary cell changes to a dormant state, deactivating a BWP applied in the activated state. In the method for the base station to control the DRX (Discontinuous Reception) operation of the terminal,
Transmitting an RRC message including a plurality of DRX configurations to a terminal;
Determining a DRX configuration to be applied to the terminal among the plurality of DRX configurations; And
And transmitting a MAC control element (MAC CE) or L1 signaling indicating a change of the DRX configuration to the terminal,
The terminal applies DRX using the DRX configuration indicated by the MAC control element or L1 signaling among the plurality of DRX configurations. The method of claim 11,
The RRC message is,
Includes DRX index information for distinguishing and indicating each of the plurality of DRX configuration,
The MAC control element or L1 signaling,
The DRX index information for indicating a DRX configuration to be applied to the terminal of the plurality of DRX configuration. The method of claim 11,
After transmitting the RRC message,
Receiving DRX index information indicating a specific DRX configuration selected by the terminal among the plurality of DRX configurations from the terminal. In the method for the base station to change the state of the secondary cell of the terminal,
Transmitting an RRC message including one or more bandwidth parts (BWP) information for the secondary cell and CSI-RS configuration information associated with the one or more BWPs to the terminal;
Determining to change the secondary cell state of the terminal from an activated state to a dormant state; And
Transmitting a MAC control element for changing a state of a secondary cell from the activated state to the dormant state to the terminal,
The terminal,
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 method of claim 14,
The RRC message is,
Includes dormant first BWP information,
The terminal,
And when the secondary cell changes to the dormant state, determines the BWP of the secondary cell as the dormant state first BWP. The method of claim 15,
The dormant state first BWP information,
And the activation state first BWP information applied when the secondary cell is in an activation state. The method of claim 14,
The RRC message is,
Contains default BWP information,
The terminal,
And when the secondary cell changes to the dormant state, determines the BWP of the secondary cell as the default BWP. The method of claim 17,
The RRC message is,
The BWP inactivity timer,
The terminal,
When the secondary cell changes to the dormant state and the BWP inactivity timer expires, the BWP of the secondary cell is determined as the default BWP,
If the BWP inactivity timer has not expired, maintaining the BWP of the secondary cell as the BWP in the activated state. In the terminal for performing a DRX (Discontinuous Reception) operation,
Receive an RRC message including a plurality of DRX configurations from a base station,
Receiving unit for receiving a MAC control element (MAC CE) or L1 signaling instructing to change the DRX configuration from the base station; And
And a control unit which applies DRX using the DRX configuration indicated by the MAC control element or L1 signaling among the plurality of DRX configurations. The method of claim 19,
And a transmitter configured to transmit DRX index information indicating a specific DRX configuration selected by the terminal among the plurality of DRX configurations to the base station. In the terminal for changing the state of the secondary cell,
Receiving an RRC message including at least one bandwidth parts (BWP) information for a secondary cell and CSI-RS configuration information associated with the at least one BWP from a base station,
A receiving unit for receiving a MAC control element for changing a state of a secondary cell from an active state to an idle state from the base station; And
And a controller configured to change a state of the secondary cell to the dormant state based on the MAC control element, and determine a BWP of the secondary cell. The method of claim 21,
The control unit,
When the secondary cell is changed to the dormant state based on the dormant state first BWP information included in the RRC message, the BWP of the secondary cell is determined as the dormant state first BWP;
On the basis of default BWP information included in the RRC message, when the secondary cell changes to the dormant state, determining the BWP of the secondary cell as the default BWP. In the base station for controlling the DRX (Discontinuous Reception) operation of the terminal,
A transmitter for transmitting an RRC message including a plurality of DRX configurations to a terminal; And
A control unit for determining a DRX configuration to be applied to the terminal of the plurality of DRX configuration,
The transmitting unit,
Transmitting a MAC control element (MAC CE) or L1 signaling indicating a change of the DRX configuration to the terminal,
The terminal is a base station for applying a DRX using the DRX configuration indicated by the MAC control element or L1 signaling of the plurality of DRX configuration. In the base station for changing the state of the secondary cell of the terminal,
A transmitter for transmitting an RRC message including one or more bandwidth parts (BWP) information for the secondary cell and CSI-RS configuration information associated with the one or more BWPs; And
And a controller for determining to change the secondary cell state of the terminal from an activated state to a dormant state.
The transmitting unit,
Transmitting a MAC control element for changing a state of a secondary cell from the activated state to the dormant state to the terminal,
The terminal,
A base station for changing a state of the secondary cell to the dormant state based on the MAC control element, and determining a BWP of the secondary cell.

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