WO2020022694A1 - Method for transmitting and receiving downlink data channel, and apparatus therefor - Google Patents

Abstract

Disclosed is a method by which a terminal having a set discontinuous reception (DRX) operation receives a physical downlink control channel (PDCCH) in a wireless communication system. In particular, the method can receive information about a plurality of frequency ranges related with each of a plurality of DRX timers, determines an active frequency range on the basis of at least one DRX timer related with active time, from among the plurality of DRX timers, and receives the PDCCH on the basis of the active frequency range and the at least one DRX timer.

Description

Method for transmitting / receiving downlink control channel and apparatus therefor

The present invention relates to a method for transmitting and receiving a downlink control channel and an apparatus therefor, and more particularly, to switching between a bandwidth part (BWP) and / or a cell for transmitting and receiving a downlink control channel and A method and apparatus for transmitting and receiving a downlink control channel according to an operation relationship of a DRX timer (discontinuous reception).

As time goes by, more communication devices require more communication traffic, and a next generation 5G system, which is an improved wireless broadband communication than the existing LTE system, is required. Called NewRAT, these next-generation 5G systems are categorized into enhanced mobile broadband (eMBB) / ultra-reliability and low-latency communication (URLLC) / massive machine-type communications (mMTC).

Here, eMBB is a next generation mobile communication scenario having characteristics such as High Spectrum Efficiency, High User Experienced Data Rate, High Peak Data Rate, and URLLC is a next generation mobile communication scenario having characteristics such as Ultra Reliable, Ultra Low Latency, Ultra High Availability, etc. (Eg, V2X, Emergency Service, Remote Control), mMTC is a next generation mobile communication scenario with low cost, low energy, short packet, and massive connectivity. (e.g., IoT).

The present invention provides a method and apparatus for transmitting and receiving a downlink control channel.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In a wireless communication system according to an embodiment of the present invention, in a method in which a terminal configured with DRX (Discontinuous Reception) operation receives a physical downlink control channel (PDCCH), a plurality of frequencies associated with each of a plurality of DRX timers Receive information about ranges, determine an active frequency range based on at least one DRX timer associated with Active Time, among the plurality of DRX timers, and determine the active frequency range and the at least one DRX timer Based on the PDCCH can be received.

In this case, the plurality of frequency ranges may be at least one of a plurality of bandwidth parts (BWPs) and a plurality of cells.

In addition, when the at least one DRX timer is two or more, the active frequency range may be determined based on a DRX timer having a higher priority among the two or more DRX timers.

In addition, when the two or more DRX timers are drx-onDurationTimer and drx-Inactivity Timer, the active frequency range may be determined based on the drx-Inactivity Timer.

In addition, if the PDCCH received during the active time is greater than or equal to a threshold value, an active frequency range may be changed.

Also, an active frequency range in a section in which a short DRX cycle operates may be greater than an active frequency range in a section in which a long DRX cycle operates.

In addition, an active frequency range may be determined based on the number of the at least one DRX timer.

In addition, when the active frequency range is changed based on the at least one DRX timer, the at least one DRX timer may not be counted in the switching interval for changing the active frequency range.

In addition, after the active frequency range is changed, counting of the at least one DRX timer may be restarted from the beginning.

In addition, after the active frequency range is changed, counting of the at least one DRX timer may begin from a corresponding counting before the change of the active frequency range.

The terminal may be capable of communicating with at least one of a terminal, a network, a base station, and an autonomous vehicle other than the terminal.

An apparatus for setting a Discontinuous Reception (DRX) operation for receiving a Physical Downlink Control Channel (PDCCH) in a wireless communication system according to the present invention, the apparatus comprising: at least one processor; And at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation. Receive information on a plurality of frequency ranges associated with each of the DRX timers of the device, and determine an active frequency range based on at least one DRX timer related to an active time of the plurality of DRX timers The PDCCH may be received based on the active frequency range and the at least one DRX timer.

In a wireless communication system according to the present invention, a terminal configured with a Discontinuous Reception (DRX) operation for receiving a physical downlink control channel (PDCCH), the terminal comprising: at least one transceiver; At least one processor; And at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation. Receive information on a plurality of frequency ranges associated with each of the DRX timers of the device, and determine an active frequency range based on at least one DRX timer related to an active time of the plurality of DRX timers The PDCCH may be received based on the active frequency range and the at least one DRX timer.

In a method for transmitting a physical downlink control channel (PDCCH) by a base station supporting a DRX (Discontinuous Reception) operation in a wireless communication system according to an embodiment of the present invention, a plurality of frequencies associated with each of a plurality of DRX timers Transmit information about ranges, determine an active frequency range based on at least one DRX timer associated with Active Time, among the plurality of DRX timers, and determine the active frequency range and the at least one DRX timer Based on the PDCCH may be transmitted.

In the wireless communication system according to the present invention, a base station supporting a Discontinuous Reception (DRX) operation to transmit a physical downlink control channel (PDCCH), the base station comprising: at least one transceiver; At least one processor; And at least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation. Transmit information about a plurality of frequency ranges associated with each of the DRX timers of the device, and determine an active frequency range based on at least one DRX timer related to an active time among the plurality of DRX timers. The PDCCH may be transmitted based on the active frequency range and the at least one DRX timer.

According to the present invention, by changing the operation of the bandwidth part (BWP), cell (cell) and / or DRX (discontinuous reception) timer according to the traffic conditions of the downlink signal and / or the communication environment of the terminal, The downlink control channel can be monitored.

Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on a 3GPP radio access network standard.

2 is a view for explaining a physical channel used in the 3GPP system and a general signal transmission method using the same.

3 to 5 are diagrams for explaining the structure of a radio frame and slot used in the NR system.

6 to 8 are diagrams for explaining a downlink control channel (PDCCH) in the NR system.

FIG. 9 is a diagram for describing one embodiment of a discontinuous reception (DRX) operation. FIG.

10 illustrates an embodiment of changing an active bandwidth part (BWP) according to traffic.

11 to 16 illustrate an operation implementation example of a terminal, a base station, and a network according to an embodiment of the present invention.

17 illustrates an embodiment of changing an active bandwidth part (BWP) according to the present invention.

18 illustrates an operation implementation example of a terminal according to an embodiment of the present invention.

19 is a block diagram illustrating components of a wireless device for implementing the present invention.

20 to 22 are diagrams illustrating examples of an artificial intelligence (AI) system and apparatus for implementing embodiments of the present invention.

The construction, operation, and other features of the present invention will be readily understood by the embodiments of the present invention described with reference to the accompanying drawings. The embodiments described below are examples in which technical features of the present invention are applied to a 3GPP system.

Although the present specification describes an embodiment of the present invention using an LTE system, an LTE-A system, and an NR system, the embodiment of the present invention as an example may be applied to any communication system corresponding to the above definition.

In addition, the specification of the base station may be used as a generic term including a remote radio head (RRH), an eNB, a transmission point (TP), a reception point (RP), a relay, and the like.

The 3GPP based communication standard provides downlink physical channels corresponding to resource elements carrying information originating from an upper layer and downlink corresponding to resource elements used by the physical layer but not carrying information originating from an upper layer. Physical signals are defined. For example, a physical downlink shared channel (PDSCH), a physical broadcast channel (PBCH), a physical multicast channel (PMCH), a physical control format indicator channel (physical control) format indicator channel (PCFICH), physical downlink control channel (PDCCH) and physical hybrid ARQ indicator channel (PHICH) are defined as downlink physical channels, reference signal and synchronization signal Is defined as downlink physical signals. A reference signal (RS), also referred to as a pilot, refers to a signal of a predetermined special waveform that the gNB and the UE know each other. For example, a cell specific RS, UE- UE-specific RS, positioning RS (PRS), and channel state information RS (CSI-RS) are defined as downlink reference signals. The 3GPP LTE / LTE-A standard corresponds to uplink physical channels corresponding to resource elements carrying information originating from an upper layer and resource elements used by the physical layer but not carrying information originating from an upper layer. Uplink physical signals are defined. For example, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH) are used as uplink physical channels. A demodulation reference signal (DMRS) for uplink control / data signals and a sounding reference signal (SRS) used for uplink channel measurement are defined.

In the present invention, Physical Downlink Control CHannel (PDCCH) / Physical Control Format Indicator CHannel (PCFICH) / PHICH (Physical Hybrid automatic retransmit request Indicator CHannel) / PDSCH (Physical Downlink Shared CHannel) are respectively DCI (Downlink Control Information) / CFI ( Control Format Indicator) / Downlink ACK / NACK (ACKnowlegement / Negative ACK) / Downlink Means a set of time-frequency resources or a set of resource elements, and also includes PUCCH (Physical Uplink Control CHannel) / PUSCH (Physical) Uplink Shared CHannel / PACH (Physical Random Access CHannel) means a set of time-frequency resources or a set of resource elements that carry Uplink Control Information (UCI) / Uplink Data / Random Access signals, respectively. PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH RE or time-frequency resource or resource element (RE) assigned to or belonging to PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH, respectively. The PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH resource is referred to below: The expression that the user equipment transmits the PUCCH / PUSCH / PRACH is hereinafter referred to as uplink control information / uplink on or through PUSCH / PUCCH / PRACH, respectively. It is used in the same sense as transmitting a data / random access signal, and the expression that the gNB transmits PDCCH / PCFICH / PHICH / PDSCH is used for downlink data / control information on or through PDCCH / PCFICH / PHICH / PDSCH, respectively. It is used in the same sense as sending it.

Hereinafter, an OFDM symbol / subcarrier / RE to which CRS / DMRS / CSI-RS / SRS / UE-RS is assigned or configured is configured as CRS / DMRS / CSI-RS / SRS / UE-RS symbol / carrier. It is called / subcarrier / RE. For example, an OFDM symbol assigned or configured with a tracking RS (TRS) is referred to as a TRS symbol, and a subcarrier assigned or configured with a TRS is called a TRS subcarrier and is assigned a TRS. Alternatively, the configured RE is called a TRS RE. In addition, a subframe configured for TRS transmission is called a TRS subframe. In addition, a subframe in which a broadcast signal is transmitted is called a broadcast subframe or a PBCH subframe, and a subframe in which a sync signal (for example, PSS and / or SSS) is transmitted is a sync signal subframe or a PSS / SSS subframe. It is called. OFDM symbols / subcarriers / RE to which PSS / SSS is assigned or configured are referred to as PSS / SSS symbols / subcarriers / RE, respectively.

In the present invention, the CRS port, the UE-RS port, the CSI-RS port, and the TRS port are each an antenna port configured to transmit CRS, an antenna port configured to transmit UE-RS, An antenna port configured to transmit CSI-RS and an antenna port configured to transmit TRS. Antenna ports configured to transmit CRSs can be distinguished from each other by the location of REs occupied by the CRS according to the CRS ports, and antenna ports configured to transmit UE-RSs The antenna ports configured to transmit the CSI-RSs may be distinguished from each other by the positions of the REs occupied by the UE-RS according to the -RS ports, and the CSI-RSs occupy the CSI-RS ports according to the CSI-RS ports. The location of the REs can be distinguished from each other. Therefore, the term CRS / UE-RS / CSI-RS / TRS port may be used as a term for a pattern of REs occupied by CRS / UE-RS / CSI-RS / TRS in a certain resource region.

Artificial Intelligence (AI)

Artificial intelligence refers to the field of researching artificial intelligence or the methodology that can produce it, and machine learning refers to the field of researching methodologies to define and solve various problems dealt with in the field of artificial intelligence. do. Machine learning is defined as an algorithm that improves the performance of a task through a consistent experience with a task.

Artificial Neural Network (ANN) is a model used in machine learning, and may refer to an overall problem-solving model composed of artificial neurons (nodes) networked by synapses. The artificial neural network may be defined by a connection pattern between neurons of different layers, a learning process of updating model parameters, and an activation function generating an output value.

The artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer contains one or more neurons, and the artificial neural network may include synapses that connect neurons to neurons. In an artificial neural network, each neuron may output a function value of an active function for input signals, weights, and deflections input through a synapse.

The model parameter refers to a parameter determined through learning and includes weights of synaptic connections and deflection of neurons. In addition, the hyperparameter means a parameter to be set before learning in the machine learning algorithm, and includes a learning rate, the number of iterations, a mini batch size, an initialization function, and the like.

The purpose of learning artificial neural networks can be seen as determining model parameters that minimize the loss function. The loss function can be used as an index for determining an optimal model parameter in the learning process of an artificial neural network.

Machine learning can be categorized into supervised learning, unsupervised learning, and reinforcement learning.

Supervised learning refers to a method of learning artificial neural networks with a given label for training data, and a label indicates a correct answer (or result value) that the artificial neural network must infer when the training data is input to the artificial neural network. Can mean. Unsupervised learning may refer to a method of training artificial neural networks in a state where a label for training data is not given. Reinforcement learning can mean a learning method that allows an agent defined in an environment to learn to choose an action or sequence of actions that maximizes cumulative reward in each state.

Machine learning, which is implemented as a deep neural network (DNN) including a plurality of hidden layers among artificial neural networks, is called deep learning (Deep Learning), which is part of machine learning. Hereinafter, machine learning is used to mean deep learning.

<Robot>

A robot can mean a machine that automatically handles or operates a given task by its own ability. In particular, a robot having a function of recognizing the environment, judging itself, and performing an operation may be referred to as an intelligent robot.

Robots can be classified into industrial, medical, household, military, etc. according to the purpose or field of use.

The robot may include a driving unit including an actuator or a motor to perform various physical operations such as moving a robot joint. In addition, the movable robot includes a wheel, a brake, a propeller, and the like in the driving unit, and can travel on the ground or fly in the air through the driving unit.

Self-Driving, Autonomous-Driving

Autonomous driving means a technology that drives by itself, and an autonomous vehicle means a vehicle that runs without a user's manipulation or with minimal manipulation of a user.

For example, in autonomous driving, the technology of maintaining a driving lane, the technology of automatically adjusting speed such as adaptive cruise control, the technology of automatically driving along a predetermined route, the technology of automatically setting a route when a destination is set, etc. All of these may be included.

The vehicle includes a vehicle having only an internal combustion engine, a hybrid vehicle having both an internal combustion engine and an electric motor together, and an electric vehicle having only an electric motor, and may include not only automobiles but also trains and motorcycles.

In this case, the autonomous vehicle may be viewed as a robot having an autonomous driving function.

EXtended Reality (XR)

Extended reality collectively refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides real world objects and backgrounds only in CG images, AR technology provides virtual CG images on real objects images, and MR technology mixes and combines virtual objects in the real world. Graphic technology.

MR technology is similar to AR technology in that it shows both real and virtual objects. However, in AR technology, virtual objects are used as complementary objects to real objects, whereas in MR technology, virtual objects and real objects are used in an equivalent nature.

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phone, tablet PC, laptop, desktop, TV, digital signage, etc. It can be called.

Now, let's look at 5G communication including NR system.

The three key requirements areas for 5G are: (1) Enhanced Mobile Broadband (eMBB) area, (2) massive Machine Type Communication (mMTC) area, and (3) ultra-reliability and It includes the area of Ultra-reliable and Low Latency Communications (URLLC).

Some use cases may require multiple areas for optimization, and other use cases may be focused on only one key performance indicator (KPI). 5G supports these various use cases in a flexible and reliable way.

eMBB goes far beyond basic mobile Internet access and covers media and entertainment applications in rich interactive work, cloud or augmented reality. Data is one of the key drivers of 5G and may not see dedicated voice services for the first time in the 5G era. In 5G, voice is expected to be treated as an application simply using the data connection provided by the communication system. The main reasons for the increased traffic volume are the increase in content size and the increase in the number of applications requiring high data rates. Streaming services (audio and video), interactive video and mobile Internet connections will become more popular as more devices connect to the Internet. Many of these applications require always-on connectivity to push real-time information and notifications to the user. Cloud storage and applications are growing rapidly in mobile communication platforms, which can be applied to both work and entertainment. And, cloud storage is a special use case that drives the growth of uplink data rates. 5G is also used for remote work in the cloud and requires much lower end-to-end delays to maintain a good user experience when tactile interfaces are used. Entertainment For example, cloud gaming and video streaming are another key factor in increasing the need for mobile broadband capabilities. Entertainment is essential in smartphones and tablets anywhere, including in high mobility environments such as trains, cars and airplanes. Another use case is augmented reality and information retrieval for entertainment. Here, augmented reality requires very low latency and instantaneous amount of data.

In addition, one of the most anticipated 5G use cases relates to the ability to seamlessly connect embedded sensors in all applications, namely mMTC. By 2020, potential IoT devices are expected to reach 20 billion. Industrial IoT is one of the areas where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

URLLC includes new services that will transform the industry through ultra-reliable / low latency available links such as remote control of key infrastructure and self-driving vehicles. The level of reliability and latency is essential for smart grid control, industrial automation, robotics, drone control and coordination.

Next, a number of use cases in a 5G communication system including an NR system will be described in more detail.

5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of providing streams that are rated at hundreds of megabits per second to gigabits per second. This high speed is required to deliver TVs in 4K and higher resolutions (6K, 8K and higher) as well as virtual and augmented reality. Virtual Reality (AVR) and Augmented Reality (AR) applications include nearly immersive sporting events. Certain applications may require special network settings. For example, for VR games, game companies may need to integrate core servers with network operator's edge network servers to minimize latency.

Automotive is expected to be an important new driver for 5G, with many use cases for mobile communications to vehicles. For example, entertainment for passengers requires simultaneous high capacity and high mobility mobile broadband. This is because future users continue to expect high quality connections regardless of their location and speed. Another use case in the automotive sector is augmented reality dashboards. It identifies objects in the dark above what the driver sees through the front window and overlays information that tells the driver about the distance and movement of the object. In the future, wireless modules enable communication between vehicles, information exchange between the vehicle and the supporting infrastructure, and information exchange between the vehicle and other connected devices (eg, devices carried by pedestrians). The safety system guides alternative courses of action to help drivers drive safer, reducing the risk of an accident. The next step will be a remotely controlled or self-driven vehicle. This is very reliable and requires very fast communication between different self-driving vehicles and between automobiles and infrastructure. In the future, self-driving vehicles will perform all driving activities, and drivers will focus on traffic anomalies that the vehicle itself cannot identify. The technical requirements of self-driving vehicles require ultra-low latency and ultra-fast reliability to increase traffic safety to an unachievable level.

Smart cities and smart homes, referred to as smart societies, will be embedded in high-density wireless sensor networks. The distributed network of intelligent sensors will identify the conditions for cost and energy-efficient maintenance of the city or home. Similar settings can be made for each hypothesis. Temperature sensors, window and heating controllers, burglar alarms and appliances are all connected wirelessly. Many of these sensors are typically low data rates, low power and low cost. However, for example, real time HD video may be required in certain types of devices for surveillance.

The consumption and distribution of energy, including heat or gas, is highly decentralized, requiring automated control of distributed sensor networks. Smart grids interconnect these sensors using digital information and communication technologies to collect information and act accordingly. This information can include the behavior of suppliers and consumers, allowing smart grids to improve the distribution of fuels such as electricity in efficiency, reliability, economics, sustainability of production and in an automated manner. Smart Grid can be viewed as another sensor network with low latency.

The health sector has many applications that can benefit from mobile communications. The communication system can support telemedicine, providing clinical care at a distance. This can help reduce barriers to distance and improve access to healthcare services that are not consistently available in remote rural areas. It is also used to save lives in critical care and emergencies. A mobile communication based wireless sensor network can provide remote monitoring and sensors for parameters such as heart rate and blood pressure.

Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing the cables with reconfigurable wireless links is an attractive opportunity in many industries. However, achieving this requires that the wireless connection operate with cable-like delay, reliability, and capacity, and that management is simplified. Low latency and very low error probability are new requirements that need to be connected in 5G.

Logistics and freight tracking are important examples of mobile communications that enable the tracking of inventory and packages from anywhere using a location-based information system. The use of logistics and freight tracking typically requires low data rates but requires wide range and reliable location information.

FIG. 1 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on a 3GPP radio access network standard. The control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted. The user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.

The physical layer, which is the first layer, provides an information transfer service to an upper layer by using a physical channel. The physical layer is connected to the upper layer of the medium access control layer through a transport channel. Data moves between the medium access control layer and the physical layer through the transmission channel. Data moves between the physical layer between the transmitting side and the receiving side through the physical channel. The physical channel utilizes time and frequency as radio resources. In detail, the physical channel is modulated in an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in downlink, and modulated in a Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in uplink.

The medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The function of the RLC layer may be implemented as a functional block inside the MAC. The Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce unnecessary control information in order to efficiently transmit IP packets such as IPv4 or IPv6 in a narrow bandwidth wireless interface.

The radio resource control (RRC) layer located at the bottom of the third layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers. The radio bearer refers to a service provided by the second layer for data transmission between the terminal and the network. To this end, the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connection (RRC Connected) between the UE and the RRC layer of the network, the UE is in an RRC connected mode, otherwise it is in an RRC idle mode. The non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.

The downlink transmission channel for transmitting data from the network to the UE includes a broadcast channel (BCH) for transmitting system information, a paging channel (PCH) for transmitting a paging message, and a shared channel (SCH) for transmitting user traffic or a control message. have. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message. Above the transmission channel, the logical channel mapped to the transmission channel includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and an MTCH (multicast). Traffic Channel).

FIG. 2 is a diagram for explaining physical channels used in a 3GPP system and a general signal transmission method using the same.

When the terminal is powered on or enters a new cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S201). To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID. have. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.

After completing the initial cell search, the UE obtains more specific system information by receiving a physical downlink control channel (PDSCH) according to a physical downlink control channel (PDCCH) and information on the PDCCH. It may be (S202).

On the other hand, when the first access to the base station or there is no radio resource for signal transmission, the terminal may perform a random access procedure (RACH) for the base station (steps S203 to S206). To this end, the UE may transmit a specific sequence as a preamble through a physical random access channel (PRACH) (S203 and S205), and receive a response message for the preamble through the PDCCH and the corresponding PDSCH ( S204 and S206). In the case of contention-based RACH, a contention resolution procedure may be additionally performed.

After performing the procedure described above, the UE performs a PDCCH / PDSCH reception (S207) and a physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink) as a general uplink / downlink signal transmission procedure. Control Channel (PUCCH) transmission (S208) may be performed. In particular, the UE receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.

Meanwhile, the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), and a rank indicator (RI). ), And the like. In the 3GPP LTE system, the terminal may transmit the above-described control information such as CQI / PMI / RI through the PUSCH and / or PUCCH.

On the other hand, the NR system considers using a high frequency band, that is, a millimeter frequency band of 6 GHz or more to transmit data while maintaining a high data rate to a large number of users using a wide frequency band. 3GPP uses this as the name NR, which is referred to as NR system in the present invention.

3 illustrates the structure of a radio frame used in NR.

In NR, uplink and downlink transmission are composed of frames. The radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HFs). The half-frame is defined by five 1 ms subframes (SFs). The subframe is divided into one or more slots, and the number of slots in the subframe depends on the subcarrier spacing (SCS). Each slot includes 12 or 14 OFDM (A) symbols according to a cyclic prefix (CP). Usually when CP is used, each slot contains 14 symbols. If extended CP is used, each slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or DFT-s-OFDM symbol).

Table 1 exemplarily shows that when CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS.

SCS (15 * 2 ^ u)	N slot symb	N frame, u slot	N subframe, u slot
15KHz (u = 0)	14	10	One
30KHz (u = 1)	14	20	2
60KHz (u = 2)	14	40	4
120KHz (u = 3)	14	80	8
240KHz (u = 4)	14	160	16

* N ^slot _symb : Number of symbols in a slot * N ^{frame, u} _slot : Number of slots in a frame

* N ^{subframe, u} _slot : Number of slots in ^subframe

Table 2 illustrates that when the extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS.

SCS (15 * 2 ^ u)	N slot symb	N frame, u slot	N subframe, u slot
60KHz (u = 2)	12	40	4

In the NR system, OFDM (A) numerology (eg, SCS, CP length, etc.) may be set differently among a plurality of cells merged into one UE. Accordingly, the (absolute time) section of a time resource (eg, SF, slot, or TTI) (commonly referred to as a time unit (TU) for convenience) composed of the same number of symbols may be set differently between merged cells. 4 illustrates a slot structure of an NR frame. The slot includes a plurality of symbols in the time domain. For example, one slot includes seven symbols in the case of a normal CP, but one slot includes six symbols in the case of an extended CP. The carrier includes a plurality of subcarriers in the frequency domain. Resource block (RB) is defined as a plurality of consecutive subcarriers (eg, 12) in the frequency domain. A bandwidth part (BWP) is defined as a plurality of consecutive (P) RBs in the frequency domain and may correspond to one numerology (eg, SCS, CP length, etc.). The carrier may include up to N (eg, 4) BWPs. Data communication is performed through an activated BWP, and only one BWP may be activated by one UE. Each element in the resource grid is referred to as a resource element (RE), one complex symbol may be mapped.

5 illustrates the structure of a self-contained slot. In an NR system, a frame is characterized by a self-complete structure in which all of DL control channels, DL or UL data, UL control channels, etc. may be included in one slot. For example, the first N symbols in a slot may be used to transmit a DL control channel (hereinafter DL control region), and the last M symbols in the slot may be used to transmit a UL control channel (hereinafter UL control region). N and M are each an integer of 0 or more. A resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region may be used for DL data transmission, or may be used for UL data transmission. As an example, the following configuration may be considered. Each interval is listed in chronological order.

1.DL only configuration

2. UL only configuration

3. Mixed UL-DL composition

DL area + Guard Period (GP) + UL control area

DL control area + GP + UL area

DL area: (i) DL data area, (ii) DL control area + DL data area

UL region: (i) UL data region, (ii) UL data region + UL control region

The PDCCH may be transmitted in the DL control region, and the PDSCH may be transmitted in the DL data region. PUCCH may be transmitted in the UL control region, and PUSCH may be transmitted in the UL data region. Downlink Control Information (DCI), for example, DL data scheduling information, UL data scheduling information, and the like may be transmitted in the PDCCH. In PUCCH, uplink control information (UCI), for example, positive acknowledgment / negative acknowledgment (ACK / NACK) information, channel state information (CSI) information, and scheduling request (SR) for DL data may be transmitted. The GP provides a time gap in the process of the base station and the terminal switching from the transmission mode to the reception mode or from the reception mode to the transmission mode. Some symbols at the time of switching from DL to UL in the subframe may be set to GP.

Downlink Channel Structure

The base station transmits a related signal to a terminal through a downlink channel, which will be described later, and the terminal receives a related signal from the base station through a downlink channel, which will be described later.

(1) physical downlink shared channel (PDSCH)

The PDSCH carries downlink data (eg, DL-shared channel transport block, DL-SCH TB), and modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM are used. Apply. A codeword is generated by encoding the TB. The PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword are mapped to one or more layers. Each layer is mapped to a resource together with a DMRS (Demodulation Reference Signal) to generate an OFDM symbol signal, and is transmitted through a corresponding antenna port.

(2) physical downlink control channel (PDCCH)

The PDCCH carries downlink control information (DCI) and a QPSK modulation method is applied. One PDCCH is composed of 1, 2, 4, 8, 16 CCEs (Control Channel Elements) according to an aggregation level (AL). One CCE consists of six Resource Element Groups (REGs). One REG is defined by one OFDM symbol and one (P) RB.

6 illustrates one REG structure. In FIG. 6, D represents a resource element (RE) to which DCI is mapped, and R represents an RE to which DMRS is mapped. DMRS is mapped to RE # 1, RE # 5 and RE # 9 in the frequency domain direction in one symbol.

The PDCCH is transmitted through a control resource set (CORESET). CORESET is defined as a REG set with a given pneumonology (eg, SCS, CP length, etc.). A plurality of OCRESET for one terminal may be overlapped in the time / frequency domain. CORESET may be set through system information (eg, MIB) or UE-specific higher layer (eg, Radio Resource Control, RRC, layer) signaling. In detail, the number of RBs and the number of symbols (up to three) constituting the CORESET may be set by higher layer signaling.

The precoder granularity in the frequency domain for each CORESET is set to one of the following by higher layer signaling:

sameAsREG-bundle : Same as REG bundle size in frequency domain

allContiguousRBs : equal to the number of consecutive RBs in the frequency domain inside the CORESET

REGs in CORESET are numbered based on a time-first mapping manner. That is, the REGs are numbered sequentially from zero starting from the first OFDM symbol in the lowest-numbered resource block within CORESET.

The mapping type from CCE to REG is set to one of a non-interleaved CCE-REG mapping type or an interleaved CCE-REG mapping type. FIG. 7A illustrates a non-interleaved CCE-REG mapping type, and FIG. 7B illustrates an interleaved CCE-REG mapping type.

Non-interleaved CCE-REG mapping type (or localized mapping type): 6 REGs for a given CCE constitute one REG bundle, and all REGs for a given CCE are contiguous. One REG bundle corresponds to one CCE

Interleaved CCE-REG Mapping Type (or Distributed Mapping Type): 2, 3 or 6 REGs for a given CCE constitute one REG bundle, and the REG bundle is interleaved in CORESET. The REG bundle in CORESET consisting of one OFDM symbol or two OFDM symbols consists of 2 or 6 REGs, and the REG bundle in CORESET consisting of three OFDM symbols consists of 3 or 6 REGs. REG bundle size is set per CORESET

8 illustrates a block interleaver. The number of rows A of the (block) interleaver for the interleaving operation as described above is set to one of 2, 3, and 6. If the number of interleaving units for a given CORESET is P, the number of columns of the block interleaver is equal to P / A. A write operation on the block interleaver is performed in a row-first direction as shown in FIG. 8, and a read operation is performed in a column-first direction. A cyclic shift (CS) of interleaving units is applied based on an id settable independently of an ID settable for DMRS.

The UE performs decoding (aka blind decoding) on the set of PDCCH candidates to obtain a DCI transmitted through the PDCCH. The set of PDCCH candidates decoded by the UE is defined as a PDCCH search space set. The search space set may be a common search space or a UE-specific search space. The UE may acquire the DCI by monitoring PDCCH candidates in one or more sets of search spaces set by MIB or higher layer signaling. Each CORESET setting is associated with one or more sets of search spaces, and each set of search spaces is associated with one COREST setting. One set of search spaces is determined based on the following parameters.

controlResourceSetId indicates the control resource set associated with the search space set

-monitoringSlotPeriodicityAndOffset : indicates PDCCH monitoring interval section (slot unit) and PDCCH monitoring interval offset (slot unit)

monitoringSymbolsWithinSlot indicates the PDCCH monitoring pattern in the slot for PDCCH monitoring (eg, indicates the first symbol (s) of the control resource set)

nrofCandidates : AL = {1, 2, 4, 8, 16} indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8)

Table 3 illustrates the features of each search space type.

Type	Search space	RNTI	Use case
Type0-PDCCH	Common	SI-RNTI on a primary cell	SIB Decoding
Type0A-PDCCH	Common	SI-RNTI on a primary cell	SIB Decoding
Type1-PDCCH	Common	RA-RNTI or TC-RNTI on a primary cell	Msg2, Msg4 decoding in RACH
Type2-PDCCH	Common	P-RNTI on a primary cell	Paging Decoding
Type3-PDCCH	Common	INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI, or CS-RNTI (s)
	UE Specific	C-RNTI, or MCS-C-RNTI, or CS-RNTI (s)	User specific PDSCH decoding

Table 4 illustrates the DCI formats transmitted on the PDCCH.

DCI format	Usage
0_0	Scheduling of PUSCH in one cell
0_1	Scheduling of PUSCH in one cell
1_0	Scheduling of PDSCH in one cell
1_1	Scheduling of PDSCH in one cell
2_0	Notifying a group of UEs of the slot format
2_1	Notifying a group of UEs of the PRB (s) and OFDM symbol (s) where UE may assume no transmission is intended for the UE
2_2	Transmission of TPC commands for PUCCH and PUSCH
2_3	Transmission of a group of TPC commands for SRS transmissions by one or more UEs

DCI format 0_0 is used for scheduling TB-based (or TB-level) PUSCH, DCI format 0_1 is used for scheduling TB-based (or TB-level) PUSCH or Code Block Group (CBG) -based (or CBG-level) PUSCH. It can be used to schedule. DCI format 1_0 is used for scheduling TB-based (or TB-level) PDSCH, DCI format 1_1 is used for scheduling TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH. Can be. DCI format 2_0 is used to deliver dynamic slot format information (eg, dynamic SFI) to the UE, and DCI format 2_1 is used to deliver downlink pre-Emption information to the UE. DCI format 2_0 and / or DCI format 2_1 may be delivered to UEs in a corresponding group through a group common PDCCH, which is a PDCCH delivered to UEs defined as one group.

Bandwidth part (BWP)

In an NR system, up to 400 MHz may be supported per one carrier. If a UE operating on such a wideband carrier always operates with a radio frequency (RF) module for the entire carrier, UE battery consumption may increase. Alternatively, when considering various use cases (eg, eMBB, URLLC, mMTC, V2X, etc.) operating in one wideband carrier, there is a difference in the number of numerologies (eg, subcarrier spacing) within each carrier. Can be supported. Alternatively, the capability for the maximum bandwidth may vary for each UE. In consideration of this, the base station may instruct the UE to operate only in some bandwidths rather than the entire bandwidths of the wideband carriers, and the corresponding bandwidths are called bandwidth parts (BWPs). In the frequency domain, BWP is a subset of contiguous common resource blocks defined for the neuron μ _i in the bandwidth part i on the carrier, with one numerology (e.g., subcarrier spacing, CP length, slot / mini-slot) Duration) can be set.

Meanwhile, the base station may set one or more BWPs in one carrier configured for the UE. Alternatively, when UEs are concentrated in a specific BWP, some UEs may be moved to another BWP for load balancing. Alternatively, in consideration of frequency domain inter-cell interference cancellation between neighboring cells, some BWPs of the cell may be set in the same slot by excluding some spectrum from the entire bandwidth. That is, the base station may configure at least one DL / UL BWP to a UE associated with a wideband carrier, and may perform physical (Physically) at least one DL / UL BWP among DL / UL BWP (s) configured at a specific time point. Switch to another configured DL / UL BWP (L1 signaling, MAC) by L1 signaling, which is a layer control signal, MAC control element (CE), which is a MAC layer control signal, or RRC signaling). Or by setting a timer value to allow the UE to switch to a defined DL / UL BWP when the timer expires. In this case, in order to indicate switching to another configured DL / UL BWP, DCI format 1_1 or DCI format 0_1 may be used. An activated DL / UL BWP is particularly called an active DL / UL BWP. The UE may not receive a configuration for the DL / UL BWP in a situation such as when the UE is in an initial access process or before the RRC connection of the UE is set up. In this situation, the UE assumes that the DL / UL BWP is called an initial active DL / UL BWP.

Meanwhile, the DL BWP is a BWP for transmitting and receiving downlink signals such as PDCCH and / or PDSCH, and the UL BWP is a BWP for transmitting and receiving uplink signals, such as PUCCH and / or PUSCH.

DRX (Discontinuous Reception) Operation

The UE may perform the DRX operation while performing the above-described procedures and / or methods. A terminal configured with DRX may lower power consumption by discontinuously receiving a DL signal. DRX may be performed in a Radio Resource Control (RRC) _IDLE state, an RRC_INACTIVE state, and an RRC_CONNECTED state. In the RRC_IDLE and RRC_INACTIVE states, the DRX is used to discontinuously receive the paging signal. Hereinafter, the DRX performed in the RRC_CONNECTED state will be described (RRC_CONNECTED DRX).

9 illustrates a DRX cycle (RRC_CONNECTED state).

Referring to FIG. 9, the DRX cycle includes On Duration and Opportunity for DRX. The DRX cycle defines a time interval in which On Duration repeats periodically. On Duration indicates a time interval that the UE monitors to receive the PDCCH. If DRX is configured, the UE performs PDCCH monitoring for On Duration. If there is a PDCCH successfully detected during PDCCH monitoring, the UE operates an inactivity timer and maintains an awake state. On the other hand, if there is no PDCCH successfully detected during PDCCH monitoring, the UE enters a sleep state after the On Duration ends. Therefore, when DRX is set, PDCCH monitoring / reception may be performed discontinuously in the time domain in performing the above-described / proposed procedures and / or methods. For example, when DRX is configured, in the present invention, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be set discontinuously according to the DRX configuration. On the other hand, when DRX is not configured, PDCCH monitoring / reception may be performed continuously in the time domain. For example, when DRX is not configured, in the present invention, the PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously set. Meanwhile, regardless of whether DRX is set or not, PDCCH monitoring may be limited in a time interval set as a measurement gap.

Table 5 shows a procedure of UE related to DRX (RRC_CONNECTED state). Referring to Table U1, DRX configuration information is received through higher layer (eg, RRC) signaling, and whether DRX ON / OFF is controlled by the DRX command of the MAC layer. If DRX is configured, as illustrated in FIG. 9, the UE may discontinuously perform PDCCH monitoring in performing the procedure and / or method described / proposed in the present invention.

	Type of signals		UE procedure
1 st step	RRC signaling (MAC-CellGroupConfig)	Receive DRX configuration information
2 nd Step	MAC CE ((Long) DRX command MAC CE)	Receive DRX command
3 rd Step	-	-Monitor a PDCCH during an on-duration of a DRX cycle

Here, MAC-CellGroupConfig includes configuration information necessary to set a medium access control (MAC) parameter for a cell group. The MAC-CellGroupConfig may also include configuration information regarding the DRX. For example, MAC-CellGroupConfig may define the DRX information as follows:-Value of drx-OnDurationTimer: Define the length of the start interval of the DRX cycle.

Value of drx-InactivityTimer: defines the length of time interval in which the UE wakes up after a PDCCH opportunity where a PDCCH indicating initial UL or DL data is detected.

Value of drx-HARQ-RTT-TimerDL: Defines the length of the maximum time interval after DL initial transmission is received until DL retransmission is received.

Value of drx-HARQ-RTT-TimerDL: Defines the length of the maximum time interval after a grant for UL initial transmission is received until a grant for UL retransmission is received.

drx-LongCycleStartOffset: Defines the length of time and start time of the DRX cycle

drx-ShortCycle (optional): defines the length of time of the short DRX cycle

Here, when any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is in operation, the UE maintains a wake-up state and performs PDCCH monitoring at every PDCCH opportunity.

In the NR system, an active DL active downlink bandwidth part (DL BWP) for downlink signal reception and / or an active UL active uplink bandwidth part (BWP) for uplink signal transmission may be flexibly changed. This is to save energy consumed for physical downlink control channel (PDCCH) monitoring by flexibly changing the active BWP according to the amount of traffic transmitted and received. In addition, in the NR system, in order to efficiently perform PDCCH monitoring and to save energy consumed for PDCCH monitoring, DRX (Discontinuous Reception) operation may be set and utilized.

Meanwhile, when a DRX operation is configured through a higher layer, the UE may monitor the PDCCH in an active time. In addition, periodic CSI reporting and / or periodic SRS transmission in the NR system may be performed during an active time or an on duration time. At this time, the conditions for setting the active time may be as follows.

(Condition 1) when drx-onDurationTimer is running, or

(Condition 2) when drx-InactivityTimer is running, or

(Condition 3) when the drx-RetransmissionTimerDL is running, or

(Condition 4) when drx-RetransmissionTimerUL is running, or

(Condition 5) when the ra-ContentionResolutionTimer is running, or

(Condition 6) when a SR (Scheduling Request) is sent to the PUCCH and the SR is pending, or

(Condition 7) When the PDCCH indicating the new transmission addressed to the C-RNTI is not successfully received after the random access response (RAR),

The present invention proposes a method for efficiently configuring or configuring a DRX operation based on BWP switching. Although the present invention has been described based on PDCCH monitoring operation for convenience of description, the idea of the present invention can be extended and applied to other UE operations such as measurement / reporting.

Embodiment 1: DRX Operation Considering BWP Switching

In the NR system, a DL BWP for receiving a downlink channel and / or a downlink signal and / or an UL BWP for transmitting an uplink channel and / or an uplink signal may be flexibly changed based on downlink control information (DCI). This is to reduce the energy consumption of the UE by using a BWP of which size is different depending on the amount of traffic. For example, if there is no traffic or small traffic, PDCCH monitoring or downlink signal is received at a relatively small BWP, and a radio frequency (RF) chain and baseband are received. The power of the baseband circuit can be saved. On the other hand, when traffic occurs in earnest or there is a large amount of traffic, resources can be efficiently used by transmitting and receiving signals in a BWP having a relatively large size.

For example, referring to FIG. 10, the UE performs PDCCH monitoring or receives a downlink signal at a relatively small BWP at a time point t1 having a certain amount of traffic or less, thereby receiving a radio frequency (RF) It is possible to save power in the chain and baseband circuits. On the other hand, the UE may perform signal transmission and reception at a BWP having a relatively large size at time t2 when the amount of traffic is greater than a certain amount. As described above, the resource can be efficiently used due to BWP switching according to the traffic amount.

In this situation, it may be efficient to operate in conjunction with a DRX operation (Discontinuous Reception operation) also BWP switching (Switching). The PDCCH monitoring method may be set differently for each BWP, and therefore, it may be desirable to set the DRX parameters independently for each BWP.

Meanwhile, the PDCCH monitoring method may be defined according to the information on the PDCCH set to be monitored and / or the information on the PDCCH monitoring opportunity. In addition, the DRX parameter may include a value of a DRX timer, information on a DRX cycle, and / or information on whether to use a short DRX cycle.

More specifically, referring to FIG. 11, the UE receives first DRX parameters for the first BWP and second DRX parameters for the second BWP (S1101), and uses the first DRX parameters for the first BWP. In operation S1103, the DRX operation may be performed in operation S1105 using the second DRX parameters. In this case, each of the first DRX parameters and the second DRX parameters may be, for example, a Timer value (eg, at least one of drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer), and DRX cycle ( cycle information, and whether or not a short DRX cycle is used. In addition, the first DRX parameters and the second DRX parameters may be set independently. That is, DRX parameters may be set independently for each BWP. In addition, although FIG. 11 illustrates a case where the first DRX parameters and the second DRX parameters are received together, the present invention is not limited thereto, and the first DRX parameters and the second DRX parameters may be received separately.

Meanwhile, in consideration of BWP switching when performing DRX operation, it is necessary to define a DRX operation during a transition time interval due to BWP switching. In general, the UE may not transmit or receive any signal during a transition time period that occurs due to BWP switching. That is, the UE may not receive any downlink signal during the switching time for switching the active DL BWP, and may not transmit any uplink signal during the switching time for switching the active UL BWP.

Therefore, when a transition time occurs during the active time period, the UE may not perform PDCCH monitoring at the corresponding transition time. However, even in this case, increasing the timer for DRX operation unnecessarily reduces the size of the active time, which may cause a latency problem in PDCCH monitoring. In other words, when a switching time occurs during the active time, and PDCCH monitoring is not performed during the switching time, increasing only the DRX timer counting for the active time may cause an unnecessary decrease in the actual duration of the active time.

Therefore, during the transition time period, it may not increase the DRX timer of all or part of the DRX. In other words, all or some of the DRX timers may not be counted during the transition time interval. That is, the operation of the DRX timer may not be performed during the switching time interval. In other words, the DRX timer may not be set to flow during the switching time interval.

In this case, the transition time may be a switching time by active DL BWP switching, but in an unpaired spectrum, a switching time by active UL BWP switching. And active DL BWP switching.

At this time, the active DL BWP switching may be caused by the PDCCH scheduling the PDSCH or may be caused by regression to the default BWP due to the expiration of the bwp-inactivity timer. Among these, regression to the default BWP occurs when the PDCCH is not received for a certain period of time, and thus may correspond to an exception for stopping the DRX timer from increasing because of energy saving. Here, the default BWP may be set to one of four configured BWPs set by the higher layer, or may be a BWP other than the four configured BWPs. Meanwhile, the default BWP may be set by the higher layer.

In other words, all or some of the DRX timers may not be increased only during the transition time by DCI-based active DL BWP switching or only during the transition time for switching to a BWP other than the basic BWP. On the other hand, regardless of the conditions under which the active DL BWP is switched, when BWP switching occurs, all or some DRX timers may be stopped. And, after the BWP switching has been made, that is, when the switching time has elapsed and the active BWP has changed, a new DRX timer can be started.

Next, we propose DRX operation after BWP switching. In the case of DCI-based BWP switching, it may be considered that traffic continues to exist after BWP switching. In this case, it may be desirable to maintain or increase the active time. In other words, it may be desirable not to increment the count of the DRX timer corresponding to Active Time.

On the other hand, when returning to the default BWP, traffic may be missing or reduced for the time being. Therefore, in such a case, it may be desirable to stop or reduce the active time. In other words, the count of the DRX timer corresponding to the active time may be stopped or increased.

Next, look at the implementation example of the operation of the UE when the BWP is switched by the MAC entity.

(1) Embodiment 1-1: The UE performs DRX operation based on a DRX cycle (eg, a short DRX cycle or a long DRX cycle) set according to a DRX parameter configured for the changed BWP after the active BWP is changed. Can be resumed. In other words, the On duration Timer can be started based on the changed BWP.

When DCI-based active DL BWP switching is performed, a PDSCH can be received immediately after BWP switching, and after the UE transmits HARQ-ACK for the received PDSCH, an RTT timer ( Round Trip Time Timer) and a retransmissionTimerDL timer may be running. However, depending on the DRX cycle configuration, the PDCCH monitoring may not be performed in the active BWP for a certain period after the PDSCH is received. For example, if a short DRX cycle is configured, it may be used from the short DRX cycle in the modified BWP. However, depending on the type, index, etc. of the changed BWP, it may be used from a long DRX cycle. For example, if the modified BWP is the default BWP, it can be used from a long DRX cycle.

(2) Embodiment 1-2: When the active BWP is changed, the UE may restart drx-onDuratonTimer and / or drx-InactivityTimer configured for the changed active BWP. In this case, PDCCH monitoring can be performed by securing an active time from the start of the changed active BWP. Also, if a short DRX cycle is configured for the changed active BWP, it may be used from the short DRX cycle.

(3) Embodiments 1-3: The UE (re) starts a third Timer (eg, bwpSwitchingTimer). When the timer is running, the active time is set, and the UE may perform PDCCH monitoring in the corresponding time interval.

Meanwhile, different DRX operations may be performed according to conditions under which the active BWP is changed. Otherwise, different DRX operations may be performed according to the changed active BWP. For example, different DRX operations may be performed depending on whether or not the default BWP is used.

For example, DRX behavior when BWP is instructed or changed in DCI or when the changed BWP is not the default BWP and DRX behavior when the default BWP is changed due to expiration of the bwp-inactivity timer. If the default BWP is the DRX operation may be different from each other. For example, if the active BWP is changed to a non-default BWP, the PDCCH monitoring can be continued by restarting the Inactivity Timer. On the other hand, when the active BWP is changed to the default BWP, PDCCH monitoring may be skipped until the next DRX cycle (eg, a long DRX cycle) for energy saving. However, even in this case, the active time may be generated under other conditions (for example, (condition 1) to (condition 7) described above).

In the NR system, some HARQ-ACK feedback may be skipped according to downlink BWP switching and / or uplink BWP switching. For example, if a downlink BWP of a serving cell or an uplink BWP of a PCell is changed between a PDSCH transmission time and a HARQ-ACK transmission time corresponding to the PDSCH, HARQ-ACK transmission for a corresponding PDSCH. May be dropped. In this case, even if the UE succeeds in PDSCH decoding, the base station may not receive the HARQ-ACK feedback and may need to transmit the retransmission DCI back to the UE.

Accordingly, assuming that HARQ-ACK feedback is dropped by BWP switching or the like, even if HARQ-ACK feedback is not actually transmitted, the HARQ process is not transmitted. The RTT timer and the retransmissionTimerDL timer can be operated. That is, when BWP switching occurs, the RTT timer and the retransmissionTimerDL timer may be operated to regard the PDSCH transmitted and received before the BWP switching as NACK and to transmit the retransmission DCI to the UE.

At this time, when the HARQ-ACK feedback corresponding to the PDSCH transmitted before the BWP switching is scheduled, the RTT timer is started at the first symbol after the corresponding PUCCH or PUSCH transmission is terminated or is expected to be terminated. Can be. In addition, after the RTT timer expires, a retransmissionTimerDL timer for the corresponding HARQ process may be started. In this case, since the HARQ-ACK feedback is not transmitted, the HARQ-ACK signal for the data is regarded as NACK regardless of whether the decoding of the data of the corresponding HARQ process is successful, and the timer You can run the timers.

On the other hand, in general, it is assumed that HARQ-ACK feedback does not occur at the base station side, or even if it is dropped, it is expected that the start of the changed active BWP is Active Time. The RTT timer and the retransmissionTimerDL timer may be stopped and restarted at the time of BWP switching or when the BWP switching is triggered. In other words, the PDSCH received before the change of the active BWP is regarded as an ACK and the DCI for PDSCH retransmission is not transmitted in the changed active BWP, so that the RTT timer and the retransmissionTimerDL timer do not operate in the changed active BWP. You may not. However, even when the active BWP is changed, the active time may be sustained by another timer such as drx-OndurationTimer or drx-InactivityTimer to receive DCI for scheduling a new PDSCH or due to other conditions.

Meanwhile, in a carrier aggregation (CA) in which a plurality of cells are aggregated, a DRX operation is performed by a master cell group (MCG) including a PCell and a secondary cell group including a PSCell. It can be set for each cell group such as Group (SCG). In this case, the DRX operation setting and / or DRX operation change according to the active BWP change may be based on a specific cell, such as a PCell. Hereinafter, a DRX operation based on a specific cell or a specific cell group. The change and / or change in the active BWP will be discussed.

In the embodiment of the present invention in which the DRX operation is changed and / or the active BWP is changed based on the specific cell, it is based on the MCG including the PCell for convenience of description, but may be extended to the SCG including the PCell. For example, in an embodiment of the present invention, the PCell may be replaced with a PSCell.

The DRX operation and / or DRX parameter may be set for each cell group. For example, DRX operation and / or DRX parameter may be additionally set for a specific BWP such as an initial BWP (PCB) or a default BWP (PCB) of the PCell. In other words, in the case of the SCell, depending on the BWP switching in the PCell regardless of the BWP switching of the SCell, the DRX operation and / or DRX parameters may be changed at a specific point in time. For example, if the active BWP of the PCell is changed from the configured BWP to the default BWP, then the SCell also changes the DRX behavior and / or DRX corresponding to the default BWP at the point when the active BWP of the PCell is changed to the default BWP. Parameters can be applied. That is, DRX operation and / or DRX parameters may be applied to all cells included in the cell group according to the active BWP of the PCell.

12, the UE determines a DRX parameter applied to all cells included in the cell group according to BWP switching in the Pcell in the cell group including the Pcell and the Scell (S1201). ), The determined DRX parameter may be applied to the Pcells and Scells included in the cell group, thereby performing a corresponding DRX operation (S1203).

For example, when the BWP operating in the PCell is not the default BWP, the first DRX parameter is applied to the corresponding cell group, and the DRX operation may be performed based on this. On the other hand, when the BWP operating in the PCell is the default BWP, the second DRX parameter is applied to the corresponding cell group, and the DRX operation may be performed based on this.

In addition, the DRX operation and / or application change timing of the DRX parameter may be based on a single cell reference. That is, the DRX operation and / or DRX parameter may be changed from the time of BWP change or the first DRX cycle in the corresponding BWP after the change in BWP. In detail, the unit of the change time point of the DRX parameter and / or DRX operation may be at least one of a subframe unit, an msec unit, a slot unit, a symbol unit, and / or an SFN unit. In addition, an embodiment of the present invention may not be applied only to a change between a default BWP and a non-default BWP, but may be that DRX operation and / or DRX parameters for each of a plurality of BWPs configured in the PCell are set or applied. have.

For this operation, the UE receives DRX parameter information provided from the base station or receives active BWP related information from the BWP operation related module or the BWP operation related device, or from the CA operation related module and / or the CA operation related module device. The PDCCH monitoring method may be configured by receiving activated cell, PCell or PSCell information. Here, an example of the PDCCH monitoring method may be a setting for a time point for the UE to perform a blind decoding.

Referring to the operation of the UE described based on FIG. 12 from a base station point of view, the base station is in a state of the DRX timer (eg, whether the DRX timer is running or stop) and / or an SR state (eg For example, one or more PDCCHs among PDCCH candidates expected by the UE or a corresponding set of PDCCH candidates may be transmitted to the UE according to whether or not to transmit SR and / or SR pending. In addition, the time point at which the PDCCH can be transmitted from the base station is within a time interval in which the UE is expected to monitor the PDCCH by DRX operation due to an active BWP change in a CA situation or a non-CA situation. Can be determined.

13, the base station transmits DRX parameters to the UE (S1301), and the UE may perform a DRX operation based on the received DRX parameters (S1303). At this time, among the received DRX parameters, the DRX parameter applied to the DRX operation may vary for each specific cell group, and may be determined according to, for example, an active BWP of the PCell. Thereafter, the base station may transmit the PDCCH to the UE in the period in which the UE performs the PDCCH monitoring (S1305) (S1309). In other words, the base station may not expect to transmit the PDCCH in the period (S1307) where the UE does not perform the PDCCH monitoring.

2. Embodiment 2: BWP switching based DRX operation

The BWP switching operation may be linked with the DRX operation. For example, instead of DCI-based BWP switching, BWP switching may occur according to a specific state of a DRX operation, and the BWP switched by a specific state may be a higher layer. It may also be set through. That is, the active BWP can be changed according to a condition for generating an active time (for example, (condition 1) to (condition 7)).

14 to 16, a description will be given of an operation implementation example of a UE, a base station, and a network according to Embodiment 2 of the present invention.

14 shows an operation implementation example of a UE according to Embodiment 2 of the present invention. Referring to FIG. 14, the UE may receive DRX parameters for a BWP and / or a cell configured for each DRX timer (S1401). That is, information about a BWP and / or a cell activated for each DRX timer may be received. Thereafter, an active BWP and / or an activated cell may be changed based on DRX timers operating according to (condition 1) to (condition 7) (S1403). Thereafter, the UE may receive the PDCCH during the Active Time in the changed active BWP and / or active cell (S1405). In this case, a specific example of changing the active BWP and / or active cell based on DRX timers may be based on the following description.

15 shows an operation implementation example of a base station according to Embodiment 2 of the present invention. Referring to FIG. 15, the base station may transmit DRX parameters for a BWP and / or a cell configured for each DRX timer (S1501). That is, information about a BWP and / or a cell activated for each DRX timer may be transmitted. Thereafter, the active BWP and / or active cell may be changed based on DRX timers operating according to (condition 1) to (condition 7) (S1503). Thereafter, the base station may transmit the PDCCH during the active time in the changed active BWP and / or the active cell (S1405). In this case, a specific example of changing the active BWP and / or active cell based on DRX timers may be based on the following description.

16 is a view for explaining an implementation example of a network operation according to a second embodiment of the present invention.

Referring to FIG. 16, the base station may transmit DRX parameters for the BWP and / or cell configured for each DRX timer to the UE (S1601). That is, information about a BWP and / or a cell activated for each DRX timer may be transmitted. Thereafter, the active BWP and / or active cell may be changed based on DRX timers operating according to (condition 1) to (condition 7) (S1603). Thereafter, the base station may transmit the PDCCH for the Active Time in the changed active BWP and / or active cell to the UE (S1605). In this case, a specific example of changing the active BWP and / or active cell based on the DRX timers may be based on the following description.

Now, the specific embodiments according to the second embodiment will be described. For example, when the UE receives PDCCH indicating new downlink data or uplink data during the on duration time, the BWP may be switched. In this case, the switched BWP may be a BWP configured by a higher layer rather than the default BWP. In other words, an active BWP in an interval in which only drx-onDurationTimer operates and an active BWP in an interval after drx-InactivityTimer starts operation may be different.

Specifically, referring to FIG. 17, the PDCCH is monitored based on BWP # 1 (eg, a default BWP) during On duration Time, and BWP # 2 (eg, configured) from Inactivity Time. PDCCH monitoring may be performed based on BWP). At this time, the PDCCH monitoring may be performed based on the BWP corresponding to the DRX timer having a high priority in the section where the active times of two DRX timers overlap. As shown in FIG. 17, a section in which an On duration Time and an Inactivity Time section overlap is generated. In general, since the traffic increases from the time when the drx-InactivityTimer timer operates, in the overlapping section, the BWP according to the Inactivity Time. PDCCH monitoring may be performed based on # 2. On the other hand, since the traffic is generally increased in the Inactivity Time, the bandwidth of the BWP activated in the Inactivity Time may be greater than the bandwidth of the BWP activated in the On duration Time.

Meanwhile, a new downlink data or a PDCCH indicating uplink data for initially operating a drx-InactivityTimer may be transmitted in an active BWP for On duration Time. In addition, depending on whether new data indicated by the PDCCH is downlink data or uplink data, the active DL BWP or the active UL BWP may be changed. For example, if the new data indicated by the PDCCH is downlink data, the active DL BWP may be changed. If the new data is uplink data, the active UL BWP may be changed.

During active time by drx-RetransmissionDL or drx-RetransmissionUL, the configured BWP may be set as an active BWP. In addition, the active BWP used in retransmission for the same transport block or the same HARQ process may be a BWP used for initial PDSCH transmission or initial PUSCH transmission.

If, in (Condition 1) to (Condition 7), Active Time occurs due to a plurality of conditions, if the BWP configured for at least one condition is set to operate, the Active Time is not the default BWP. PDCCH monitoring may be performed based on the configured BWP. Or, based on the BWP configured based on the number of conditions that require operation to the BWP configured according to a predefined criterion or a higher layer signaled threshold signaled by a higher layer. Whether to perform PDCCH monitoring or PDCCH monitoring based on a default BWP may be determined. For example, comparing the number of conditions associated with a configured BWP and the number of conditions associated with a default BWP among a plurality of conditions based on generating an active time, activate the more BWPs. can do. However, if Active Time is generated only by the drx-onDurationTimer, it can revert to the default BWP.

Meanwhile, as another example, when the number of PDCCHs received during the on duration time and / or inactivity time is greater than or equal to a certain threshold value, the BWP may be switched. In this case, the specific threshold may be set in a higher layer. In addition, a timer counting the number of received PDCCHs may be operated for each On duration time or for each inactivity timer operation, and if the number of received PDCCHs is greater than or equal to a specific threshold based on a timer counting the number of PDCCHs, the BWP may be switched. have. At this time, the active BWP that is changed when the number of received PDCCHs is greater than or equal to a specific threshold may have a wider band than the BWP before the change. 18, the UE determines whether the number of PDCCHs received while the drx-onDurationTimer and / or the drx-InactivityTimer is greater than or equal to a predetermined value (S1801), and if the number of PDCCHs is greater than or equal to the predetermined value, , BWP switching (S1803).

On the other hand, the active (DL) BWP in the section in which the short DRX cycle operates and the section in which the long DRX cycle operates may also be different. For example, during a period of short DRX cycle operation, it operates at a relatively large BWP (e.g., a configured BWP) in anticipation of continuing or increasing traffic. When switching to a long DRX cycle period again due to no traffic, etc., it may be configured to operate in a small BWP (eg, a default BWP).

On the other hand, BWP switching in the second embodiment described above may be limited to a case in which PDCCH-to-PDSCH timing or PDCCH-to-PUSCH timing indicated by DCI is equal to or higher than a predetermined level. At this time, the predetermined level may be indicated by a higher layer.

On the other hand, the conditions for returning back to the default BWP from the BWP configured in the above-described Embodiment 2 may be as follows.

(1) the drx-InactivityTimer has expired, and / or

(2) received DRX Command MAC CE, and / or

(3) the bwp-InactivityTimer has expired, and / or

(4) When the UE does not receive a wake-up signal during a specific time interval or when it receives a go-to-sleep signal.

Here, the drx-InactivityTimer may operate only by the PDCCH indicating the transmission of new data, and the drx-InactivityTimer may also operate by the PDCCH indicating the transmission of the new data and / or the PDCCH indicating the retransmission of the data. In addition, the DRX Command MAC CE may be forcibly terminating the On duration Time. In addition, the wake-up signal and / or the go-to-sleep signal in (4) are signals that are newly introduced in the NR system.

Meanwhile, in the above-described embodiments, the BWP switching has been prepared for convenience of description, but the idea of the present invention may be extended even in the case of carrier aggregation (CA). For example, depending on a condition in which an Active Time is generated in the DRX operation, the combination and number of cells activated in each section may be different. In this case, the combination and number of cells activated in each section may be set through higher layer signaling.

For example, only the PCell may operate during the On duration Time period, but at least one SCell may be activated or at least one SCell may be activated at Inactivity Time. At this time, SCells that can be activated may be limited to specific SCells. For example, only SCells in which the previous state of the corresponding SCell is dormant may be activated.

As another example, a third timer can be operated with drx-onDurationTimer and / or drx-InactivityTimer at the start of the DRX cycle. In addition, when the third timer expires, one or more SCells may be activated. The information on the third timer may be set by the base station through a higher layer signal to the UE. The third timer may be a number of times that the drx-InactivityTimer starts or restarts. The SCell to be activated by the above-described operation may be configured by the base station to the UE through a higher layer signal, and a cell configured for the corresponding UE or a dormant cell. This may be a candidate cell of the SCell to be activated.

In addition, when a cell group activated by an active time or a third timer is different during a DRX operation, a specific cell group according to an active time or a third timer is used. Scheduling cells may be different. For example, scheduling for cell group 2 may be performed in a cell group 1 or a specific cell in cell group 1 in a section operating only for cell group 1. And self-scheduling that receives scheduling for each cell group 2 from each cell in a section operating corresponding to the cell group 2 later. ) Or may be scheduled by another scheduling cell.

For the above-described operation, the UE determines whether DRX parameter information, a DRX timer operation related module or a DRX timer operation related device, a PDCCH related module, or a PDCCH related device is received from a DRX timer operation related device. Information included, Active BWP obtained from BWP operation related module or BWP operation related device, Information obtained from default BWP, Initial BWP related information and / or CA action related module or CA action related device. Based on the configured cell, the dormant cell, the deactivated cell, the PCell, and the PSCell information, the UE configures a BWP to be activated and / or a configured cell to be activated. cell) can be set.

In the present specification, for convenience of description, the first embodiment and the second embodiment are separately created, but the first and second embodiments are not necessarily limited to any one. In other words, Embodiment 1 and Embodiment 2 may be performed simultaneously or sequentially, or may be performed in a combination of Embodiment 1 and Embodiment 2.

19 illustrates an embodiment of a wireless communication device according to an embodiment of the present invention.

The wireless communication device described with reference to FIG. 19 may represent a terminal and / or a base station according to an embodiment of the present invention. However, the wireless communication device of FIG. 19 is not necessarily limited to a terminal and / or a base station according to the present embodiment, and may be replaced with various devices such as a vehicle communication system or device, a wearable device, a laptop, a smart phone, and the like. Can be. More specifically, the apparatus includes a base station, a network node, a transmission terminal, a reception terminal, a wireless device, a wireless communication device, a vehicle, a vehicle equipped with an autonomous driving function, an unmanned aerial vehicle (UAV), and artificial intelligence (AI). Modules, Robots, Augmented Reality Devices, Virtual Reality Devices, MTC Devices, IoT Devices, Medical Devices, Fintech Devices (or Financial Devices), Security Devices, Climate / Environmental Devices or Other Fourth Industrial Revolution Sector or device associated with a 5G service. For example, a drone may be a vehicle in which humans fly by radio control signals. For example, the MTC device and the IoT device are devices that do not require human intervention or manipulation, and may be smart meters, bending machines, thermometers, smart bulbs, door locks, various sensors, and the like. For example, a medical device is a device used for the purpose of inspecting, replacing, or modifying a device, structure, or function used for diagnosing, treating, alleviating, treating, or preventing a disease. In vitro) diagnostic devices, hearing aids, surgical devices, and the like. For example, the security device is a device installed to prevent a risk that may occur and maintain safety, and may be a camera, a CCTV, a black box, or the like. For example, the fintech device is a device that can provide financial services such as mobile payment, and may be a payment device or a point of sales (POS). For example, the climate / environmental device may mean a device for monitoring and predicting the climate / environment.

In addition, the transmitting terminal and the receiving terminal are mobile phones, smart phones, laptop computers, digital broadcasting terminals, personal digital assistants, portable multimedia players, navigation, slate PCs. , Tablet PCs, ultrabooks, wearable devices (eg, smartwatches, glass glasses, head mounted displays), foldables foldable) devices and the like. For example, the HMD is a display device of a head type, and may be used to implement VR or AR.

19, a terminal and / or a base station according to an exemplary embodiment of the present invention may include at least one processor 10, a transceiver 35, such as a digital signal processor (DSP) or a microprocessor, Power management module 5, antenna 40, battery 55, display 15, keypad 20, memory 30, subscriber identity module (SIM) card 25, speaker 45 and microphone ( 50) and the like. In addition, the terminal and / or base station may include a single antenna or multiple antennas. Meanwhile, the transceiver 35 may also be referred to as an RF module.

The processor 10 may be configured to implement the functions, procedures, and / or methods described in FIGS. 1-18. In at least some of the embodiments described in FIGS. 1-18, the processor 10 may implement one or more protocols, such as layers of a radio interface protocol (eg, functional layers).

The memory 30 is connected to the processor 10 and stores information related to the operation of the processor 10. The memory 30 may be located inside or outside the processor 10 and may be connected to the processor through various technologies such as wired or wireless communication.

The user may enter various types of information (eg, indication information such as phone number) by pressing a button on the keypad 20 or by various techniques such as voice activation using the microphone 50. The processor 10 performs appropriate functions such as receiving and / or processing the user's information and dialing the telephone number.

It is also possible to retrieve data (eg, operation data) from the SIM card 25 or the memory 30 to perform the appropriate functions. In addition, the processor 10 may receive and process GPS information from a GPS chip to obtain location information of a terminal and / or a base station such as a vehicle navigation and a map service, or perform a function related to the location information. In addition, the processor 10 may display these various types of information and data on the display 15 for the user's reference and convenience.

The transceiver 35 is connected to the processor 10 to transmit and / or receive a radio signal such as a radio frequency (RF) signal. In this case, the processor 10 may control the transceiver 35 to initiate communication and transmit a radio signal including various types of information or data such as voice communication data. Transceiver 35 may include a receiver for receiving wireless signals and a transmitter for transmitting. Antenna 40 facilitates the transmission and reception of wireless signals. In some embodiments, upon receiving a wireless signal, the transceiver 35 may forward and convert the signal to a baseband frequency for processing by the processor 10. The processed signal may be processed according to various techniques, such as being converted into audible or readable information, and such a signal may be output through the speaker 45.

In some embodiments, the sensor may also be connected to the processor 10. The sensor may include one or more sensing devices configured to detect various types of information including speed, acceleration, light, vibration, and the like. The processor 10 receives and processes sensor information obtained from the sensor such as proximity, position, and image, thereby performing various functions such as collision avoidance and autonomous driving.

Meanwhile, various components such as a camera and a USB port may be additionally included in the terminal and / or the base station. For example, a camera may be further connected to the processor 10, and such a camera may be used for various services such as autonomous driving, vehicle safety service, and the like.

As such, FIG. 19 is only an embodiment of devices configuring a terminal and / or a base station, but is not limited thereto. For example, some components such as keypad 20, Global Positioning System (GPS) chip, sensor, speaker 45 and / or microphone 50 may be excluded for terminal and / or base station implementation in some embodiments. It may be.

Specifically, to implement the embodiments of the present disclosure, the operation of the wireless communication apparatus illustrated in FIG. 19 is a terminal according to an embodiment of the present disclosure. When the wireless communication device is a terminal according to an embodiment of the present disclosure, the processor 10 may enable the transceiver 35 to receive first DRX parameters for a first BWP and second DRX parameters for a second BWP. Can be controlled. In addition, the DRX operation for the first BWP may be performed using the first DRX parameters, and the DRX operation for the second BWP may be performed using the second DRX parameters. In this case, each of the first DRX parameters and the second DRX parameters may be, for example, a Timer value (eg, at least one of drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer), and DRX cycle ( cycle information, and whether or not a short DRX cycle is used. In addition, the first DRX parameters and the second DRX parameters may be set independently. In addition, a detailed operation process of the processor 10 may be according to the first embodiment.

In addition, the processor 10 determines a DRX parameter applied to all cells included in the cell group according to BWP switching in the Pcell in a cell group including a Pcell and a Scell, and includes a Pcell and a cell included in the cell group. By applying the determined DRX parameter to the Scell, it can perform a corresponding DRX operation.

For example, when the BWP operating in the PCell is not the default BWP, the first DRX parameter is applied to the corresponding cell group, and the DRX operation is performed by the processor 10 based on this. Can be. On the other hand, when the BWP operating in the PCell is the default BWP, the second DRX parameter is applied to the corresponding cell group, and the DRX operation is performed by the processor 10 based on this. Can be. In addition, a detailed operation process of the processor 10 may be according to the first embodiment.

Meanwhile, the processor 10 may receive DRX parameters for a BWP and / or a cell set for each DRX timer. That is, the transceiver 35 may be controlled to receive information about the BWP and / or the cell activated for each DRX timer. Thereafter, the active BWP and / or the activated cell may be changed based on DRX timers operating according to (condition 1) to (condition 7). Thereafter, the UE may control the transceiver 35 to receive the PDCCH during the Active Time within the changed active BWP and / or active cell. At this time, the active BWP and / or active cell is changed based on the DRX timers. A specific example may be based on the second embodiment.

The processor 10 may perform only any one of the above-described first and second embodiments, but is not limited thereto. That is, the processor 10 may perform Embodiment 1 and Embodiment 2 together. In other words, the processor 10 may simultaneously perform the first and second embodiments or sequentially. In addition, it can be performed in a combination of Example 1 and Example 2.

Meanwhile, in order to implement the embodiments of the present invention, when the wireless communication device represented in FIG. 19 is a base station according to an embodiment of the present invention, the processor 10 may perform a state of the DRX timer (for example, PDCCH candidates expected by the UE according to the DRX timer, whether the DRX timer is running or stop, and / or the SR state (e.g., whether the SR is transmitted and / or SR pending) or the like. The transceiver 35 may be controlled to transmit one or more PDCCHs from the corresponding PDCCH candidate set to the corresponding UE. In addition, when the PDCCH can be transmitted under the control of the processor 10, the UE may monitor the PDCCH by DRX operation according to an active BWP change in a CA situation or a non-CA situation. It can be determined within a time interval that is expected to be. The detailed operation process of the processor 10 described above may be based on the first embodiment.

In addition, the processor 10 controls the transceiver 35 to send DRX parameters to the UE, and the UE may perform a DRX operation based on the received DRX parameters. In this case, among the received DRX parameters, the DRX parameter applied to the DRX operation may vary for each specific cell group, and may be determined according to, for example, an active BWP of the PCell. Thereafter, the processor 10 may control the transceiver 35 to transmit the PDCCH to the UE in a period in which the UE performs PDCCH monitoring. In other words, the processor 10 may not expect to transmit the PDCCH in a period where the UE does not perform the PDCCH monitoring. In addition, a detailed operation process of the processor 10 may be according to the first embodiment.

Meanwhile, the processor 10 may control the transceiver 35 to transmit DRX parameters for a BWP and / or a cell set for each DRX timer. That is, information about a BWP and / or a cell activated for each DRX timer may be transmitted. Thereafter, the active BWP and / or active cell may be changed based on DRX timers operating according to (condition 1) to (condition 7). Thereafter, the processor 10 may control the transceiver 35 to transmit the PDCCH during the active time in the changed active BWP and / or active cell. In this case, a specific example of changing the active BWP and / or the active cell based on the DRX timers may be based on the second embodiment described above.

The processor 10 may perform only any one of the above-described first and second embodiments, but is not limited thereto. That is, the processor 10 may perform Embodiment 1 and Embodiment 2 together. In other words, the processor 10 may simultaneously perform the first and second embodiments or sequentially. In addition, it can be performed in a combination of Example 1 and Example 2.

20 illustrates an AI device 100 that may implement embodiments of the present invention.

The AI device 100 is a TV, a projector, a mobile phone, a smartphone, a desktop computer, a notebook, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a tablet PC, a wearable device, and a set-top box (STB). ), A DMB receiver, a radio, a washing machine, a refrigerator, a desktop computer, a digital signage, a robot, a vehicle, and the like, or a fixed device or a mobile device.

Referring to FIG. 20, the terminal 100 uses the communication unit 110, the input unit 120, the running processor 130, the sensing unit 140, the output unit 150, the memory 170, the processor 180, and the like. It may include.

The communicator 110 may transmit / receive data to / from external devices such as the other AI devices 100a to 100e or the AI server 200 using wired or wireless communication technology. For example, the communicator 110 may transmit / receive sensor information, a user input, a learning model, a control signal, and the like with external devices.

At this time, the communication technology used by the communication unit 110 includes Global System for Mobile communication (GSM), Code Division Multi Access (CDMA), Long Term Evolution (LTE), 5G, Wireless LAN (WLAN), and Wireless-Fidelity (Wi-Fi). ), Bluetooth (Bluetooth®), Radio Frequency Identification (RFID), Infrared Data Association (IrDA), ZigBee, Near Field Communication (NFC), and the like.

The input unit 120 may acquire various types of data.

In this case, the input unit 120 may include a camera for inputting an image signal, a microphone for receiving an audio signal, a user input unit for receiving information from a user, and the like. Here, a signal obtained from the camera or microphone may be referred to as sensing data or sensor information by treating the camera or microphone as a sensor.

The input unit 120 may acquire input data to be used when acquiring an output using training data and a training model for model training. The input unit 120 may obtain raw input data, and in this case, the processor 180 or the running processor 130 may extract input feature points as preprocessing on the input data.

The learning processor 130 may train a model composed of artificial neural networks using the training data. Here, the learned artificial neural network may be referred to as a learning model. The learning model may be used to infer result values for new input data other than the training data, and the inferred values may be used as a basis for judgment to perform an operation.

In this case, the running processor 130 may perform AI processing together with the running processor 240 of the AI server 200.

In this case, the running processor 130 may include a memory integrated with or implemented in the AI device 100. Alternatively, the running processor 130 may be implemented using the memory 170, an external memory directly coupled to the AI device 100, or a memory held in the external device.

The sensing unit 140 may acquire at least one of internal information of the AI device 100, surrounding environment information of the AI device 100, and user information using various sensors.

In this case, the sensors included in the sensing unit 140 include a proximity sensor, an illumination sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint sensor, an ultrasonic sensor, an optical sensor, a microphone, and a li. , Radar and so on.

The output unit 150 may generate an output related to visual, auditory, or tactile.

In this case, the output unit 150 may include a display unit for outputting visual information, a speaker for outputting auditory information, and a haptic module for outputting tactile information.

The memory 170 may store data supporting various functions of the AI device 100. For example, the memory 170 may store input data, training data, training model, training history, and the like acquired by the input unit 120.

The processor 180 may determine at least one executable operation of the AI device 100 based on the information determined or generated using the data analysis algorithm or the machine learning algorithm. In addition, the processor 180 may control the components of the AI device 100 to perform a determined operation.

To this end, the processor 180 may request, search for, receive, or utilize data of the running processor 130 or the memory 170, and may perform an operation predicted or determined to be preferable among the at least one executable operation. The components of the AI device 100 may be controlled to execute.

In this case, when the external device needs to be linked to perform the determined operation, the processor 180 may generate a control signal for controlling the corresponding external device and transmit the generated control signal to the corresponding external device.

The processor 180 may obtain intention information about the user input, and determine the user's requirements based on the obtained intention information.

In this case, the processor 180 uses at least one of a speech to text (STT) engine for converting a voice input into a string or a natural language processing (NLP) engine for obtaining intention information of a natural language. Intent information corresponding to the input can be obtained.

In this case, at least one or more of the STT engine or the NLP engine may be configured as an artificial neural network, at least partly learned according to a machine learning algorithm. At least one of the STT engine or the NLP engine may be learned by the running processor 130, learned by the running processor 240 of the AI server 200, or may be learned by distributed processing thereof. It may be.

The processor 180 collects history information including operation contents of the AI device 100 or feedback of a user about the operation, and stores the information in the memory 170 or the running processor 130, or the AI server 200. Can transmit to external device. The collected historical information can be used to update the learning model.

The processor 180 may control at least some of the components of the AI device 100 to drive an application program stored in the memory 170. In addition, the processor 180 may operate by combining two or more of the components included in the AI device 100 to drive the application program.

21 shows an AI server 200 that can implement embodiments of the present invention.

Referring to FIG. 21, the AI server 200 may refer to an apparatus for learning an artificial neural network using a machine learning algorithm or using an learned artificial neural network. Here, the AI server 200 may be composed of a plurality of servers to perform distributed processing, or may be defined as a 5G network. In this case, the AI server 200 may be included as a part of the AI device 100 to perform at least some of the AI processing together.

The AI server 200 may include a communication unit 210, a memory 230, a running processor 240, a processor 260, and the like.

The communication unit 210 may transmit / receive data with an external device such as the AI device 100.

The memory 230 may include a model storage unit 231. The model storage unit 231 may store a trained model or a trained model (or artificial neural network 231a) through the running processor 240.

The running processor 240 may train the artificial neural network 231a using the training data. The learning model may be used while mounted in the AI server 200 of the artificial neural network, or may be mounted and used in an external device such as the AI device 100.

The learning model can be implemented in hardware, software or a combination of hardware and software. When some or all of the learning model is implemented in software, one or more instructions constituting the learning model may be stored in the memory 230.

The processor 260 may infer a result value with respect to the new input data using the learning model, and generate a response or control command based on the inferred result value.

22 shows an AI system 1 according to which embodiments of the present invention can be implemented.

Referring to FIG. 22, the AI system 1 may include at least one of an AI server 200, a robot 100a, an autonomous vehicle 100b, an XR device 100c, a smartphone 100d, or a home appliance 100e. This cloud network 10 is connected. Here, the robot 100a to which the AI technology is applied, the autonomous vehicle 100b, the XR device 100c, the smartphone 100d or the home appliance 100e may be referred to as the AI devices 100a to 100e.

The cloud network 10 may refer to a network that forms part of the cloud computing infrastructure or exists in the cloud computing infrastructure. Here, the cloud network 10 may be configured using a 3G network, 4G or Long Term Evolution (LTE) network or a 5G network.

That is, the devices 100a to 100e and 200 constituting the AI system 1 may be connected to each other through the cloud network 10. In particular, the devices 100a to 100e and 200 may communicate with each other through the base station, but may communicate with each other directly without passing through the base station.

The AI server 200 may include a server that performs AI processing and a server that performs operations on big data.

The AI server 200 includes at least one or more of the AI devices constituting the AI system 1, such as a robot 100a, an autonomous vehicle 100b, an XR device 100c, a smartphone 100d, or a home appliance 100e. Connected via the cloud network 10, the AI processing of the connected AI devices 100a to 100e may help at least a part.

In this case, the AI server 200 may train the artificial neural network according to the machine learning algorithm on behalf of the AI devices 100a to 100e and directly store the learning model or transmit the training model to the AI devices 100a to 100e.

At this time, the AI server 200 receives input data from the AI devices 100a to 100e, infers a result value with respect to the received input data using a learning model, and generates a response or control command based on the inferred result value. Can be generated and transmitted to the AI device (100a to 100e).

Alternatively, the AI devices 100a to 100e may infer a result value from input data using a direct learning model and generate a response or control command based on the inferred result value.

Hereinafter, various embodiments of the AI devices 100a to 100e to which the above-described technology is applied will be described. Here, the AI devices 100a to 100e illustrated in FIG. 22 may be viewed as specific embodiments of the AI device 100 illustrated in FIG. 20.

<AI + robot>

The robot 100a may be applied to an AI technology, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, or the like.

The robot 100a may include a robot control module for controlling an operation, and the robot control module may refer to a software module or a chip implemented in hardware.

The robot 100a acquires state information of the robot 100a by using sensor information obtained from various kinds of sensors, detects (recognizes) the surrounding environment and an object, generates map data, moves paths and travels. You can decide on a plan, determine a response to a user interaction, or determine an action.

Here, the robot 100a may use sensor information obtained from at least one sensor among a rider, a radar, and a camera to determine a movement route and a travel plan.

The robot 100a may perform the above operations by using a learning model composed of at least one artificial neural network. For example, the robot 100a may recognize the surrounding environment and the object using the learning model, and determine the operation using the recognized surrounding environment information or the object information. Here, the learning model may be directly learned by the robot 100a or may be learned by an external device such as the AI server 200.

In this case, the robot 100a may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 200 and receives the result generated accordingly to perform an operation. You may.

The robot 100a determines a movement route and a travel plan by using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and controls the driving unit to determine the movement path and the travel plan. Accordingly, the robot 100a may be driven.

The map data may include object identification information for various objects arranged in a space in which the robot 100a moves. For example, the map data may include object identification information about fixed objects such as walls and doors and movable objects such as flower pots and desks. The object identification information may include a name, type, distance, location, and the like.

In addition, the robot 100a may control the driving unit based on the control / interaction of the user, thereby performing an operation or driving. In this case, the robot 100a may acquire the intention information of the interaction according to the user's motion or voice utterance, and determine the response based on the obtained intention information to perform the operation.

<AI + autonomous driving>

The autonomous vehicle 100b may be implemented by an AI technology and implemented as a mobile robot, a vehicle, an unmanned aerial vehicle, or the like.

The autonomous vehicle 100b may include an autonomous driving control module for controlling the autonomous driving function, and the autonomous driving control module may refer to a software module or a chip implemented in hardware. The autonomous driving control module may be included inside as a configuration of the autonomous driving vehicle 100b, but may be configured as a separate hardware and connected to the outside of the autonomous driving vehicle 100b.

The autonomous vehicle 100b obtains state information of the autonomous vehicle 100b by using sensor information obtained from various types of sensors, detects (recognizes) an environment and an object, generates map data, A travel route and a travel plan can be determined, or an action can be determined.

Here, the autonomous vehicle 100b may use sensor information acquired from at least one sensor among a lidar, a radar, and a camera, similarly to the robot 100a, to determine a movement route and a travel plan.

In particular, the autonomous vehicle 100b may receive or recognize sensor information from external devices or receive information directly recognized from external devices. .

The autonomous vehicle 100b may perform the above operations by using a learning model composed of at least one artificial neural network. For example, the autonomous vehicle 100b may recognize a surrounding environment and an object using a learning model, and determine a driving line using the recognized surrounding environment information or object information. Here, the learning model may be learned directly from the autonomous vehicle 100b or may be learned from an external device such as the AI server 200.

In this case, the autonomous vehicle 100b may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 200 and receives the result generated accordingly. You can also do

The autonomous vehicle 100b determines a moving route and a driving plan by using at least one of map data, object information detected from sensor information, or object information obtained from an external device, and controls the driving unit to determine the moving route and the driving plan. According to the plan, the autonomous vehicle 100b can be driven.

The map data may include object identification information for various objects arranged in a space (eg, a road) on which the autonomous vehicle 100b travels. For example, the map data may include object identification information about fixed objects such as street lights, rocks, buildings, and movable objects such as vehicles and pedestrians. The object identification information may include a name, type, distance, location, and the like.

In addition, the autonomous vehicle 100b may perform an operation or drive by controlling the driving unit based on the user's control / interaction. In this case, the autonomous vehicle 100b may acquire the intention information of the interaction according to the user's motion or voice utterance, and determine the response based on the obtained intention information to perform the operation.

<AI + XR>

AI technology is applied to the XR device 100c, and a head-mount display (HMD), a head-up display (HUD) provided in a vehicle, a television, a mobile phone, a smartphone, a computer, a wearable device, a home appliance, a digital signage It may be implemented as a vehicle, a fixed robot or a mobile robot.

The XR apparatus 100c analyzes three-dimensional point cloud data or image data acquired through various sensors or from an external device to generate location data and attribute data for three-dimensional points, thereby providing information on the surrounding space or reality object. It can obtain and render XR object to output. For example, the XR apparatus 100c may output an XR object including additional information about the recognized object in correspondence with the recognized object.

The XR apparatus 100c may perform the above-described operations using a learning model composed of at least one artificial neural network. For example, the XR apparatus 100c may recognize a reality object in 3D point cloud data or image data using a learning model, and may provide information corresponding to the recognized reality object. Here, the learning model may be learned directly from the XR device 100c or learned from an external device such as the AI server 200.

In this case, the XR apparatus 100c may perform an operation by generating a result using a direct learning model, but transmits sensor information to an external device such as the AI server 200 and receives the result generated accordingly. It can also be done.

<AI + Robot + Autonomous Driving>

The robot 100a may be applied to an AI technology and an autonomous driving technology, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, or the like.

The robot 100a to which the AI technology and the autonomous driving technology are applied may mean a robot itself having an autonomous driving function, a robot 100a interacting with the autonomous vehicle 100b, and the like.

The robot 100a having an autonomous driving function may collectively move devices according to a given copper line or determine a copper line by itself without controlling the user.

The robot 100a and the autonomous vehicle 100b having the autonomous driving function may use a common sensing method to determine one or more of a movement route or a driving plan. For example, the robot 100a and the autonomous vehicle 100b having the autonomous driving function may determine one or more of the movement route or the driving plan by using information sensed through the lidar, the radar, and the camera.

The robot 100a, which interacts with the autonomous vehicle 100b, is present separately from the autonomous vehicle 100b and is linked to the autonomous driving function inside or outside the autonomous vehicle 100b, or the autonomous vehicle 100b. ) May perform an operation associated with the user who boarded.

At this time, the robot 100a interacting with the autonomous vehicle 100b acquires sensor information on behalf of the autonomous vehicle 100b and provides the sensor information to the autonomous vehicle 100b or obtains sensor information, By generating object information and providing the object information to the autonomous vehicle 100b, the autonomous vehicle function of the autonomous vehicle 100b can be controlled or assisted.

Alternatively, the robot 100a interacting with the autonomous vehicle 100b may monitor a user in the autonomous vehicle 100b or control a function of the autonomous vehicle 100b through interaction with the user. . For example, when it is determined that the driver is in a drowsy state, the robot 100a may activate the autonomous driving function of the autonomous vehicle 100b or assist control of the driving unit of the autonomous vehicle 100b. Here, the function of the autonomous vehicle 100b controlled by the robot 100a may include not only an autonomous vehicle function but also a function provided by a navigation system or an audio system provided in the autonomous vehicle 100b.

Alternatively, the robot 100a interacting with the autonomous vehicle 100b may provide information or assist a function to the autonomous vehicle 100b outside the autonomous vehicle 100b. For example, the robot 100a may provide traffic information including signal information to the autonomous vehicle 100b, such as a smart signal light, or may interact with the autonomous vehicle 100b, such as an automatic electric charger of an electric vehicle. You can also automatically connect an electric charger to the charging port.

<AI + robot + XR>

The robot 100a may be applied to an AI technology and an XR technology, and may be implemented as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, a drone, or the like.

The robot 100a to which the XR technology is applied may mean a robot that is the object of control / interaction in the XR image. In this case, the robot 100a may be distinguished from the XR apparatus 100c and interlocked with each other.

When the robot 100a that is the object of control / interaction in the XR image acquires sensor information from sensors including a camera, the robot 100a or the XR apparatus 100c generates an XR image based on the sensor information. In addition, the XR apparatus 100c may output the generated XR image. The robot 100a may operate based on a control signal input through the XR apparatus 100c or user interaction.

For example, the user may check an XR image corresponding to the viewpoint of the robot 100a that is remotely linked through an external device such as the XR device 100c, and may adjust the autonomous driving path of the robot 100a through interaction. You can control the movement or driving, or check the information of the surrounding objects.

<AI + Autonomous driving + XR>

The autonomous vehicle 100b may be implemented by an AI technology and an XR technology, such as a mobile robot, a vehicle, an unmanned aerial vehicle, and the like.

The autonomous vehicle 100b to which the XR technology is applied may mean an autonomous vehicle having a means for providing an XR image, or an autonomous vehicle that is the object of control / interaction in the XR image. In particular, the autonomous vehicle 100b, which is the object of control / interaction in the XR image, is distinguished from the XR apparatus 100c and may be linked with each other.

The autonomous vehicle 100b having means for providing an XR image may acquire sensor information from sensors including a camera and output an XR image generated based on the obtained sensor information. For example, the autonomous vehicle 100b may provide a passenger with an XR object corresponding to a real object or an object in a screen by outputting an XR image with a HUD.

In this case, when the XR object is output to the HUD, at least a part of the XR object may be output to overlap the actual object to which the occupant's eyes are directed. On the other hand, when the XR object is output on the display provided inside the autonomous vehicle 100b, at least a portion of the XR object may be output to overlap the object in the screen. For example, the autonomous vehicle 100b may output XR objects corresponding to objects such as a road, another vehicle, a traffic light, a traffic sign, a motorcycle, a pedestrian, a building, and the like.

When the autonomous vehicle 100b that is the object of control / interaction in the XR image acquires sensor information from sensors including a camera, the autonomous vehicle 100b or the XR apparatus 100c may be based on the sensor information. The XR image may be generated, and the XR apparatus 100c may output the generated XR image. In addition, the autonomous vehicle 100b may operate based on a user's interaction or a control signal input through an external device such as the XR apparatus 100c.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims can be combined to form embodiments by combining claims that are not expressly cited in the claims or as new claims by post-application correction.

Certain operations described in this document as being performed by a base station may be performed by an upper node in some cases. That is, it is apparent that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention 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), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs 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.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

The method for transmitting / receiving a downlink control channel as described above and an apparatus therefor have been described with reference to the example applied to the fifth generation NewRAT system, but can be applied to various wireless communication systems in addition to the fifth generation NewRAT system.

Claims (15)

1. In a wireless communication system, a method in which a terminal configured with DRX (Discontinuous Reception) operation receives a physical downlink control channel (PDCCH),

   Receive information on a plurality of frequency ranges associated with each of the plurality of DRX timers,

   Determining an active frequency range based on at least one DRX timer associated with an active time of the plurality of DRX timers,

   Receiving the PDCCH based on the active frequency range and the at least one DRX timer,

   How to receive PDCCH.
2. The method of claim 1,

   The plurality of frequency ranges,

   At least one of a plurality of bandwidth parts (BWP) and a plurality of cells,

   How to receive PDCCH.
3. The method of claim 1,

   When the at least one DRX timer is more than one, the active frequency range is determined based on a higher priority DRX timer among the two or more DRX timers.

   How to receive PDCCH.
4. The method of claim 3, wherein

   When the two or more DRX timers are drx-onDurationTimer and drx-Inactivity Timer, the active frequency range is determined based on drx-Inactivity Timer,

   How to receive PDCCH.
5. The method of claim 1,

   If the received PDCCH during the active time is greater than or equal to a threshold, an active frequency range is changed.

   How to receive PDCCH.
6. The method of claim 1,

   The active frequency range in the section in which the short DRX cycle operates is greater than the active frequency range in the section in which the long DRX cycle operates,

   How to receive PDCCH.
7. The method of claim 1,

   An active frequency range is determined based on the number of the at least one DRX timer,

   How to receive PDCCH.
8. The method of claim 1,

   When the active frequency range is changed based on the at least one DRX timer, the at least one DRX timer is not counted in the switching interval for changing the active frequency range.

   How to receive PDCCH.
9. The method of claim 8,

   After the active frequency range is changed, counting of the at least one DRX timer is restarted from the beginning,

   How to receive PDCCH.
10. The method of claim 8,

    After the active frequency range has changed, counting the at least one DRX timer begins with a corresponding counting before changing the active frequency range,

    How to receive PDCCH.
11. The method of claim 1,

    The terminal is capable of communicating with at least one of a terminal, a network, a base station, and an autonomous vehicle other than the terminal,

    How to receive PDCCH.
12. An apparatus in which a DRX (Discontinuous Reception) operation for receiving a physical downlink control channel (PDCCH) is set in a wireless communication system,

    At least one processor; And

    At least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation;

    The specific action,

    Receive information on a plurality of frequency ranges associated with each of the plurality of DRX timers,

    Determining an active frequency range based on at least one DRX timer associated with an active time of the plurality of DRX timers,

    Receiving the PDCCH based on the active frequency range and the at least one DRX timer,

    Device.
13. In a wireless communication system, a terminal configured with a Discontinuous Reception (DRX) operation for receiving a physical downlink control channel (PDCCH),

    At least one transceiver;

    At least one processor; And

    At least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation;

    The specific action,

    Receive information on a plurality of frequency ranges associated with each of the plurality of DRX timers,

    Determining an active frequency range based on at least one DRX timer associated with an active time of the plurality of DRX timers,

    Receiving the PDCCH based on the active frequency range and the at least one DRX timer,

    Terminal.
14. A method for transmitting a physical downlink control channel (PDCCH) by a base station supporting a DRX operation in a wireless communication system,

    Transmit information on a plurality of frequency ranges associated with each of the plurality of DRX timers,

    Determining an active frequency range based on at least one DRX timer associated with an active time of the plurality of DRX timers,

    Transmitting the PDCCH based on the active frequency range and the at least one DRX timer,

    PDCCH transmission method.
15. In a wireless communication system, a base station supporting a Discontinuous Reception (DRX) operation to transmit a physical downlink control channel (PDCCH),

    At least one transceiver;

    At least one processor; And

    At least one memory operatively coupled to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation;

    The specific action,

    Transmit information on a plurality of frequency ranges associated with each of the plurality of DRX timers,

    Determining an active frequency range based on at least one DRX timer associated with an active time of the plurality of DRX timers,

    Transmitting the PDCCH based on the active frequency range and the at least one DRX timer,

    Base station.

Images