WO2021201442A1

WO2021201442A1 - Method for adapting to monitoring period in wireless communication system and terminal using same method

Info

Publication number: WO2021201442A1
Application number: PCT/KR2021/002482
Authority: WO
Inventors: 서인권
Original assignee: 엘지전자 주식회사
Priority date: 2020-04-02
Filing date: 2021-02-26
Publication date: 2021-10-07

Abstract

The present specification provides a method for monitoring a physical control channel (PDCCH) by a terminal in a wireless communication system, the method comprising: receiving discontinuous reception (DRX) configuration information from a base station; receiving information relating to a PDCCH monitoring period change from the base station; and monitoring the PDCCH on the basis of the DRX configuration information and the information relating to the PDCCH monitoring period change, wherein the information relating to the PDCCH monitoring period change is information relating to a new PDCCH monitoring period for the PDCCH monitoring, and the new PDCCH monitoring period is valid for the terminal on the basis that the new PDCCH monitoring period is a multiple or a divisor of an existing PDCCH monitoring period of the terminal.

Description

A method for adapting a monitoring period in a wireless communication system and a terminal using the method

This specification relates to wireless communication.

As more and more communication devices require greater communication capacity, there is a need for improved mobile broadband communication compared to a conventional radio access technology (RAT). Massive Machine Type Communications (MTC), which provides various services anytime, anywhere by connecting multiple devices and objects, is also one of the major issues to be considered in next-generation communication. In addition, a communication system design in consideration of a service/terminal sensitive to reliability and latency is being discussed. The introduction of next-generation wireless access technology in consideration of such extended mobile broadband communication, massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication) is being discussed, and in this specification, for convenience, the technology is called new RAT or NR.

Meanwhile, in the present specification, a PDCCH monitoring adaptation scheme is provided.

According to an embodiment of the present specification, information on a PDCCH monitoring period change is received from a base station, and the information on the PDCCH monitoring period change is information on a new PDCCH monitoring period for performing the PDCCH monitoring, and the new PDCCH A method is provided, characterized in that the new PDCCH monitoring period is effective for the terminal based on the monitoring period being a multiple or a divisor of the existing PDCCH monitoring period of the terminal.

According to the present specification, even when the terminal does not detect the change in the monitoring period, the impact due to the change in the monitoring period can be minimized.

Effects that can be obtained through specific examples of the present specification are not limited to the effects listed above. For example, various technical effects that a person having ordinary skill in the related art can understand or derive from this specification may exist. Accordingly, the specific effects of the present specification are not limited to those explicitly described herein, and may include various effects that can be understood or derived from the technical characteristics of the present specification.

1 illustrates a system structure of a New Generation Radio Access Network (NG-RAN) to which NR is applied.

2 illustrates functional partitioning between NG-RAN and 5GC.

3 illustrates a frame structure that can be applied in NR.

4 illustrates CORESET.

5 is a diagram illustrating a difference between a conventional control region and CORESET in NR.

6 shows an example of a frame structure for a new radio access technology.

7 is an abstract diagram of a hybrid beamforming structure from the viewpoint of the TXRU and the physical antenna.

8 is a diagram schematically illustrating the beam sweeping operation with respect to a synchronization signal and system information in a downlink (DL) transmission process.

9 shows an example of a 5G usage scenario to which the technical features of the present specification can be applied.

10 illustrates a scenario in which three different bandwidth parts are set.

11 is a flowchart illustrating an example of performing an idle mode DRX operation.

12 schematically illustrates an example of an idle mode DRX operation.

13 is a flowchart illustrating an example of a method of performing a C-DRX operation.

14 schematically illustrates an example of C-DRX operation.

15 is a flowchart of a method for receiving information on a PDCCH monitoring period change according to an embodiment of the present specification.

16 is a flowchart of a method for receiving information about a PDCCH monitoring period change from the viewpoint of a UE, according to an embodiment of the present specification.

17 is a block diagram of an example of an apparatus for receiving information about a PDCCH monitoring period change from the viewpoint of a terminal, according to an embodiment of the present specification.

18 is a flowchart of a method for transmitting information on a PDCCH monitoring period change from the viewpoint of a base station, according to an embodiment of the present specification.

19 is a block diagram of an example of an apparatus for transmitting information on a PDCCH monitoring period change from the viewpoint of a base station, according to an embodiment of the present specification.

20 illustrates a communication system 1 applied to this specification.

21 illustrates a wireless device applicable to this specification.

22 shows another example of a wireless device applicable to the present specification.

23 illustrates a signal processing circuit for a transmission signal.

24 shows another example of a wireless device applied to the present specification.

25 illustrates a portable device applied to the present specification.

26 illustrates a vehicle or an autonomous driving vehicle applied to this specification.

In this specification, “A or B (A or B)” may mean “only A”, “only B” or “both A and B”. In other words, in the present specification, “A or B (A or B)” may be interpreted as “A and/or B (A and/or B)”. For example, “A, B or C(A, B or C)” herein means “only A”, “only B”, “only C”, or “any and any combination of A, B and C ( any combination of A, B and C)”.

A slash (/) or a comma (comma) used herein may mean “and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C” may mean “A, B, or C”.

As used herein, “at least one of A and B” may mean “only A”, “only B” or “both A and B”. In addition, in this specification, the expression “at least one of A or B” or “at least one of A and/or B” means “at least one It can be interpreted the same as “at least one of A and B”.

Also, as used herein, “at least one of A, B and C” means “only A”, “only B”, “only C”, or “A, B and C” Any combination of A, B and C”. Also, “at least one of A, B or C” or “at least one of A, B and/or C” means may mean “at least one of A, B and C”.

In addition, parentheses used herein may mean “for example”. Specifically, when displayed as “control information (PDCCH)”, “PDCCH” may be proposed as an example of “control information”. In other words, “control information” in the present specification is not limited to “PDCCH”, and “PDDCH” may be proposed as an example of “control information”. Also, even when displayed as “control information (ie, PDCCH)”, “PDCCH” may be proposed as an example of “control information”.

In this specification, technical features that are individually described within one drawing may be implemented individually or simultaneously.

The layers of the Radio Interface Protocol between the terminal and the network are L1 (Layer 1), It can be divided into L2 (2nd layer) and L3 (3rd layer), of which the physical layer belonging to the first layer provides an information transfer service using a physical channel, The RRC (Radio Resource Control) layer located in the third layer performs a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

A physical layer (PHY (physical) layer) provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to a medium access control (MAC) layer, which is an upper layer, through a transport channel. Data moves between the MAC layer and the physical layer through the transport channel. Transmission channels are classified according to how and with what characteristics data are transmitted through the air interface.

Data moves through physical channels between different physical layers, that is, between the physical layers of the transmitter and the receiver. The physical channel may be modulated in an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and time and frequency are used as radio resources.

The functions of the MAC layer include mapping between logical channels and transport channels and multiplexing/demultiplexing into transport blocks provided as physical channels on transport channels of MAC service data units (SDUs) belonging to logical channels. The MAC layer provides a service to the RLC (Radio Link Control) layer through a logical channel.

The functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs. In order to guarantee the various Quality of Service (QoS) required by Radio Bearer (RB), the RLC layer has a transparent mode (Transparent Mode, TM), an unacknowledged mode (Unacknowledged Mode, UM) and an acknowledged mode (Acknowledged Mode). , AM) provides three operation modes. AM RLC provides error correction through automatic repeat request (ARQ).

The RRC (Radio Resource Control) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transport channels and physical channels in relation to configuration, re-configuration, and release of radio bearers. RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, PDCP layer) for data transfer between the terminal and the network.

Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include delivery of user data, header compression, and ciphering. Functions of the Packet Data Convergence Protocol (PDCP) layer in the control plane include transmission of control plane data and encryption/integrity protection.

Setting the RB means defining the characteristics of a radio protocol layer and channel to provide a specific service, and setting each specific parameter and operation method. The RB may be further divided into a signaling RB (SRB) and a data RB (DRB). The SRB is used as a path for transmitting an RRC message in the control plane, and the DRB is used as a path for transmitting user data in the user plane.

When an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in an RRC connected state, otherwise, it is in an RRC idle state.

As a downlink transmission channel for transmitting data from a network to a terminal, there are a BCH (Broadcast Channel) for transmitting system information and a downlink SCH (Shared Channel) for transmitting user traffic or control messages. Traffic or control messages of downlink multicast or broadcast services may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). On the other hand, as an uplink transport channel for transmitting data from the terminal to the network, there are a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

The logical channels that are located above the transport channel and are mapped to the transport channel include a Broadcast Control Channel (BCCH), a Paging Control Channel (PCCH), a Common Control Channel (CCCH), a Multicast Control Channel (MCCH), and a Multicast Traffic Channel (MTCH). channels), etc.

A physical channel consists of several OFDM symbols in the time domain and several sub-carriers in the frequency domain. One sub-frame is composed of a plurality of OFDM symbols in the time domain. A resource block is a resource allocation unit and includes a plurality of OFDM symbols and a plurality of sub-carriers. In addition, each subframe may use specific subcarriers of specific OFDM symbols (eg, the first OFDM symbol) of the corresponding subframe for a Physical Downlink Control Channel (PDCCH), that is, an L1/L2 control channel. A Transmission Time Interval (TTI) is a unit time of subframe transmission.

Hereinafter, a new radio access technology (new RAT, NR) will be described.

Referring to FIG. 1 , the NG-RAN may include a gNB and/or an eNB that provides a UE with user plane and control plane protocol termination. 1 illustrates a case in which only gNBs are included. The gNB and the eNB are connected to each other through an Xn interface. The gNB and the eNB are connected to the 5G Core Network (5GC) through the NG interface. More specifically, the access and mobility management function (AMF) is connected through the NG-C interface, and the user plane function (UPF) is connected through the NG-U interface.

2 illustrates functional partitioning between NG-RAN and 5GC.

Referring to Figure 2, the gNB is inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control (Connection Mobility Control), radio admission control (Radio Admission Control), measurement setup and provision Functions such as (Measurement configuration & Provision) and dynamic resource allocation may be provided. AMF may provide functions such as NAS security, idle state mobility processing, and the like. The UPF may provide functions such as mobility anchoring and PDU processing. A Session Management Function (SMF) may provide functions such as terminal IP address assignment and PDU session control.

3 illustrates a frame structure that can be applied in NR.

Referring to FIG. 3 , a frame may be configured in 10 milliseconds (ms), and may include 10 subframes configured in 1 ms.

One or a plurality of slots may be included in the subframe according to subcarrier spacing.

Table 1 below illustrates a subcarrier spacing configuration μ.

[Table 1]

Table 2 below illustrates the number of slots in a frame (N ^frameμ _slot ), the number of slots in a ^subframe _{(N subframeμ slot} ), and the number of symbols in a ^slot _{(N slot symb} ) according to subcarrier spacing configuration μ. .

μμ	N^slot _symb N ^slot _symbol	N^frame ^{, μ} _slot N ^frame ^{, μ} _slot	N^subframe ^{, μ} _slot N ^subframe ^{, μ} _slot
00	1414	1010	1One
1One	1414	2020	22
22	1414	4040	44
33	1414	8080	88
44	1414	160160	1616

In FIG. 3 , μ=0, 1, and 2 are exemplified. A physical downlink control channel (PDCCH) may include one or more control channel elements (CCEs) as shown in Table 3 below.

집성 레벨(Aggregation level)Aggregation level	CCE의 개수(Number of CCEs)Number of CCEs
1One	1One
22	22
44	44
88	88
1616	1616

That is, the PDCCH may be transmitted through a resource composed of 1, 2, 4, 8 or 16 CCEs. Here, the CCE is composed of six resource element groups (REGs), and one REG is composed of one resource block in the frequency domain and one orthogonal frequency division multiplexing (OFDM) symbol in the time domain. Meanwhile, in NR, a new unit called a control resource set (CORESET) may be introduced. The UE may receive the PDCCH in CORESET.

4 illustrates CORESET.

Referring to FIG. 4, CORESET may ^{be composed of N CORESET} _RB resource blocks in the frequency domain, and may be composed of N ^CORESET _symb ∈ {1, 2, 3} symbols in the time domain. N ^CORESET _RB and N ^CORESET _symb may be provided by the base station through a higher layer signal. As shown in FIG. 4 , a plurality of CCEs (or REGs) may be included in CORESET.

The UE may attempt PDCCH detection in CORESET in units of 1, 2, 4, 8 or 16 CCEs. One or a plurality of CCEs capable of attempting PDCCH detection may be referred to as PDCCH candidates.

The UE may receive a plurality of CORESETs set.

Referring to FIG. 5 , the control region 800 in the conventional wireless communication system (eg, LTE/LTE-A) is configured over the entire system band used by the base station. All terminals except for some terminals supporting only a narrow band (eg, eMTC/NB-IoT terminals) receive radio signals of the entire system band of the base station in order to properly receive/decode the control information transmitted by the base station. should be able

On the other hand, in NR, the aforementioned CORESET was introduced. The

CORESETs

801, 802, and 803 may be said to be radio resources for control information to be received by the terminal, and only a part of the system band may be used instead of the entire system band. The base station may allocate a CORESET to each terminal, and may transmit control information through the allocated CORESET. For example, in FIG. 5 , a first CORESET 801 may be allocated to UE 1 , a second CORESET 802 may be allocated to UE 2 , and a third CORESET 803 may be allocated to UE 3 . In NR, the terminal may receive control information of the base station even if it does not necessarily receive the entire system band.

In the CORESET, there may be a terminal-specific CORESET for transmitting terminal-specific control information and a common CORESET for transmitting control information common to all terminals.

On the other hand, in NR, high reliability may be required depending on the application field, and in this situation, downlink control information (DCI) transmitted through a downlink control channel (eg, physical downlink control channel: PDCCH) ), the target block error rate (BLER) can be significantly lower than in the prior art. As an example of a method for satisfying such a high reliability requirement, the amount of content included in DCI may be reduced, and/or the amount of resources used during DCI transmission may be increased. . In this case, the resource may include at least one of a resource in a time domain, a resource in a frequency domain, a resource in a code domain, and a resource in a space domain.

In NR, the following techniques/features can be applied.

<셀프 컨테인드 서브프레임 구조(Self-contained subframe structure)><Self-contained subframe structure>

6 shows an example of a frame structure for a new radio access technology.

In NR, as shown in FIG. 6 for the purpose of minimizing latency, a structure in which a control channel and a data channel are time division multiplexed (TDM) in one TTI is considered as one of the frame structures. can be

In FIG. 6 , a hatched region indicates a downlink control region, and a black portion indicates an uplink control region. An area without an indication may be used for downlink data (DL data) transmission or uplink data (UL data) transmission. A characteristic of this structure is that downlink (DL) transmission and uplink (UL) transmission are sequentially performed in one subframe, and DL data is transmitted in a subframe, and UL ACK / Acknowledgment/Not-acknowledgement (NACK) may also be received. As a result, when a data transmission error occurs, the time taken until data retransmission is reduced, thereby minimizing the latency of final data transmission.

In a data and control TDMed subframe structure in which such a data and control region is TDMed, a time gap for the process of switching between the base station and the terminal from the transmit mode to the receive mode or from the receive mode to the transmit mode ) is required. To this end, some OFDM symbols at the time of switching from DL to UL in the self-contained subframe structure may be set as a guard period (GP).

<아날로그 빔포밍 #1(Analog beamforming #1)><Analog beamforming #1>

In millimeter wave (mmW), the wavelength is shortened, so that a plurality of antenna elements can be installed in the same area. That is, in the 30 GHz band, the wavelength is 1 cm, and a total of 100 antenna elements can be installed in a 2-dimensional array form at 0.5 wavelength (lambda) intervals on a 5 by 5 cm panel. Therefore, mmW uses a plurality of antenna elements to increase a beamforming (BF) gain to increase coverage or increase throughput.

In this case, if a transceiver unit (TXRU) is provided to enable transmission power and phase adjustment for each antenna element, independent beamforming for each frequency resource is possible. However, to install the TXRU in all of the 100 antenna elements (element) has a problem in terms of effectiveness in terms of price. Therefore, a method of mapping a plurality of antenna elements to one TXRU and adjusting the direction of a beam with an analog phase shifter is being considered. This analog beamforming method has a disadvantage in that frequency selective beamforming cannot be performed because only one beam direction can be made in the entire band.

As an intermediate form between digital beamforming (Digital BF) and analog beamforming (analog BF), hybrid beamforming (hybrid BF) having B TXRUs, which is less than Q antenna elements, may be considered. In this case, although there is a difference according to the connection method of the B TXRUs and the Q antenna elements, the direction of beams that can be transmitted simultaneously is limited to B or less.

<아날로그 빔포밍 #2(Analog beamforming #2)><Analog beamforming #2>

In the NR system, when multiple antennas are used, a hybrid beamforming technique combining digital beamforming and analog beamforming is emerging. At this time, analog beamforming (or RF beamforming) performs precoding (or combining) at the RF stage, which results in the number of RF chains and the number of D/A (or A/D) converters. It has the advantage of being able to achieve performance close to digital beamforming while reducing the For convenience, the hybrid beamforming structure may be represented by N TXRUs and M physical antennas. Then, digital beamforming for L data layers to be transmitted from the transmitter may be expressed as an N by L matrix, and then the N digital signals converted into analog signals through TXRU. After conversion, analog beamforming expressed by an M by N matrix is applied.

In FIG. 7 , the number of digital beams is L, and the number of analog beams is N. Furthermore, in the NR system, a direction for supporting more efficient beamforming to a terminal located in a specific area is considered by designing a base station to change analog beamforming in units of symbols. Furthermore, when defining N specific TXRUs and M RF antennas as one antenna panel in FIG. 7, the NR system considers a method of introducing a plurality of antenna panels to which hybrid beamforming independent of each other is applicable. is becoming

As described above, when the base station uses a plurality of analog beams, since analog beams advantageous for signal reception may be different for each terminal, at least a specific subframe for a synchronization signal, system information, paging, etc. In , a beam sweeping operation in which a plurality of analog beams to be applied by a base station is changed for each symbol so that all terminals can have a reception opportunity is being considered.

In FIG. 8 , a physical resource (or a physical channel) through which system information of the NR system is transmitted in a broadcasting manner is named xPBCH (physical broadcast channel). At this time, analog beams belonging to different antenna panels within one symbol can be transmitted simultaneously, and a single analog beam (corresponding to a specific antenna panel) is applied as illustrated in FIG. 8 to measure channels for each analog beam. A method of introducing a beam reference signal (BRS), which is a transmitted reference signal (RS), is being discussed. The BRS may be defined for a plurality of antenna ports, and each antenna port of the BRS may correspond to a single analog beam. In this case, unlike BRS, all analog beams in an analog beam group may be applied and transmitted so that a synchronization signal or xPBCH can be well received by any terminal.

9 shows an example of a 5G usage scenario to which the technical features of the present specification can be applied. The 5G usage scenario shown in FIG. 9 is merely exemplary, and the technical features of the present specification may be applied to other 5G usage scenarios not shown in FIG. 9 .

Referring to FIG. 9 , the three main requirement areas of 5G are (1) enhanced mobile broadband (eMBB) area, (2) massive machine type communication (mMTC) area and ( 3) includes ultra-reliable and low latency communications (URLLC) domains. Some use cases may require multiple domains for optimization, while other use cases may focus on only one key performance indicator (KPI). 5G is to support these various use cases in a flexible and reliable way.

eMBB focuses on overall improvements in data rates, latency, user density, capacity and coverage of mobile broadband connections. eMBB aims for a throughput of around 10 Gbps. eMBB goes far beyond basic mobile Internet access, covering rich interactive work, media and entertainment applications in the cloud or augmented reality. Data is one of the key drivers of 5G, and for the first time in the 5G era, we may not see dedicated voice services. In 5G, voice is simply expected to be processed as an application using the data connection provided by the communication system. The main causes of 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 widely used as more devices are connected to the Internet. Many of these applications require always-on connectivity to push real-time information and notifications to users. Cloud storage and applications are rapidly increasing in mobile communication platforms, which can be applied to both work and entertainment. 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, requiring much lower end-to-end latency to maintain a good user experience when tactile interfaces are used. In entertainment, for example, cloud gaming and video streaming are another key factor increasing the demand for mobile broadband capabilities. Entertainment is essential on smartphones and tablets anywhere, including in high-mobility environments such as trains, cars and airplanes. Another use example is augmented reality for entertainment and information retrieval. Here, augmented reality requires very low latency and instantaneous amount of data.

mMTC is designed to enable communication between a large number of low-cost devices powered by batteries and is intended to support applications such as smart metering, logistics, field and body sensors. mMTC is targeting a battery life of 10 years or so and/or a million devices per square kilometer. mMTC enables seamless connectivity of embedded sensors in all fields and is one of the most anticipated 5G use cases. Potentially, by 2020, there will be 20.4 billion IoT devices. Industrial IoT is one of the areas where 5G will play a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.

URLLC is ideal for vehicular communications, industrial control, factory automation, telesurgery, smart grid, and public safety applications by allowing devices and machines to communicate very reliably, with very low latency and with high availability. URLLC aims for a delay on the order of 1 ms. URLLC includes new services that will transform the industry through ultra-reliable/low-latency links such as remote control of critical infrastructure and autonomous vehicles. This level of reliability and latency is essential for smart grid control, industrial automation, robotics, and drone control and coordination.

Next, a plurality of usage examples included in the triangle of FIG. 9 will be described in more detail.

5G could complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of delivering streams rated at hundreds of megabits per second to gigabits per second. Such high speed may be required to deliver TVs with resolutions of 4K or higher (6K, 8K and higher) as well as virtual reality (VR) and augmented reality (AR). VR and AR applications almost include immersive sporting events. Certain applications may require special network settings. For VR games, for example, game companies may need to integrate core servers with network operators' edge network servers to minimize latency.

Automotive is expected to be an important new driving force for 5G, with many use cases for mobile communication to vehicles. For example, entertainment for passengers requires both high capacity and high mobile broadband. The reason is that future users will continue to expect high-quality connections regardless of their location and speed. Another example of use in the automotive sector is augmented reality dashboards. The augmented reality contrast board allows drivers to identify objects in the dark above what they are seeing through the front window. The augmented reality dashboard superimposes information to inform the driver about the distance and movement of objects. In the future, wireless modules will enable communication between vehicles, information exchange between vehicles and supporting infrastructure, and information exchange between vehicles and other connected devices (eg, devices carried by pedestrians). Safety systems can help reduce the risk of accidents by guiding drivers through alternative courses of action to help them drive safer. The next step will be remote-controlled vehicles or autonomous vehicles. This requires very reliable and very fast communication between different autonomous vehicles and/or between vehicles and infrastructure. In the future, autonomous vehicles will perform all driving activities, allowing drivers to focus only on traffic anomalies that the vehicle itself cannot discern. The technological requirements of autonomous vehicles demand ultra-low latency and ultra-fast reliability to increase traffic safety to unattainable levels for humans.

Smart cities and smart homes, referred to as smart societies, will be embedded with high-density wireless sensor networks. A distributed network of intelligent sensors will identify conditions for keeping a city or house cost- and energy-efficient. A similar setup can be performed for each household. Temperature sensors, window and heating controllers, burglar alarms and appliances are all connected wirelessly. Many of these sensors typically require 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 use digital information and communication technologies to interconnect these sensors to collect information and act on it. This information can include supplier and consumer behavior, enabling smart grids to improve efficiency, reliability, economy, sustainability of production and distribution of fuels such as electricity in an automated manner. The smart grid can also be viewed as another low-latency sensor network.

The health sector has many applications that can benefit from mobile communications. The communication system may support telemedicine providing clinical care from a remote location. This can help reduce barriers to distance and improve access to consistently unavailable health care in remote rural areas. It is also used to save lives in critical care and emergency situations. A wireless sensor network based on mobile communication may 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 cables with reconfigurable radio links is an attractive opportunity for many industries. Achieving this, however, requires that wireless connections operate with similar latency, reliability and capacity as cables, and that their management is simplified. Low latency and very low error probability are new requirements that need to be connected with 5G.

Logistics and freight tracking are important use cases for mobile communications that use location-based information systems to enable tracking of inventory and packages from anywhere. Logistics and freight tracking use cases typically require low data rates but require wide range and reliable location information.

Hereinafter, a discussion related to power saving will be described.

The battery life of a terminal is a factor of user experience that affects the adoption of 5G handsets and/or services. The power efficiency for 5G NR terminals is at least not worse than that of LTE, and a study of terminal power consumption can be provided for techniques and designs for improvement to be identified and applied.

ITU-R defines energy efficiency as one of the minimum technical performance requirements of IMT-2020. According to the ITU-R report, the minimum requirements relating to the technical performance of the IMT-2020 air interface, “the energy efficiency of a device can be related to the support of two aspects: a) efficient under load. Data transfer, b) Low energy consumption when there is no data. Efficient data transmission in the loaded case is demonstrated by the average spectral efficiency. In the absence of data, low energy consumption can be estimated by the slip ratio.

Since NR systems can support high-speed data transmission, it is expected that user data will tend to burst and be served for very short periods of time. One efficient terminal power saving mechanism is to trigger the terminal for network access from the power efficiency mode. As long as there is no information about network access through the terminal power saving framework, the terminal maintains a power efficiency mode such as a micro-sleep or OFF period within a long DRX cycle. Instead, the network may support the terminal to switch from the network access mode to the power saving mode when there is no traffic to transmit (eg, dynamically switch the terminal to sleep with a network support signal).

In addition to minimizing power consumption with a new wake-up/go-to-sleep mechanism, it may also be provided to reduce power consumption during network connection in RRC_CONNECTED mode. More than half of the power consumption in LTE is the terminal in the connected mode. Power saving techniques should focus on minimizing the major factors of power consumption during network connection, including handling of aggregated bandwidth, dynamic number of RF chains and dynamic transmit/receive time and dynamic transition to power efficient mode. Since there is no or little data in most cases of LTE field TTI, a power saving technique for dynamic adaptation to different data arrivals should be studied in RRC-CONNECTED mode. Dynamic adaptation to different dimensions of traffic such as carrier wave, antenna, beamforming and bandwidth can also be studied. Furthermore, how to strengthen the transition between the network access mode and the power saving mode should be considered. Both network-assisted and terminal-assisted approaches should be considered for terminal power saving mechanisms.

The UE also consumes a lot of power for RRM measurement. In particular, the UE must be powered on before the DRX ON period for tracking the channel in order to prepare for RRM measurement. A part of the RRM measurement is not essential, but consumes a lot of terminal power. For example, low mobility terminals do not need to measure as frequently as high mobility terminals. The network may provide signaling in order for the UE to reduce power consumption for unnecessary RRM measurement. Additional terminal support, for example terminal state information, etc. is also useful for the network to enable the reduction of terminal power consumption for RRM measurement.

Therefore, there is a need for research to identify the feasibility and advantages of a technology that enables the realization of a terminal that can operate while reducing power consumption.

Hereinafter, UE power saving schemes will be described.

For example, the terminal power saving techniques include terminal adaptation to traffic and power consumption characteristics, adaptation to frequency change, adaptation to time change, adaptation to antenna, adaptation to DRX configuration, and terminal processing capability. Adaptation, adaptation to obtain PDCCH monitoring/decoding reduction, power saving signal/channel/procedure to trigger terminal power consumption adaptation, power consumption reduction in RRM measurement, etc. may be considered.

In relation to adaptation to DRX configuration, a downlink shared channel (DL-SCH) characterized by support for terminal discontinuous reception (DRX) to enable terminal power saving, a terminal enabling terminal power saving A paging channel (PCH) characterized by support for DRX (here, a DRX cycle may be indicated to the UE by the network) may be considered.

Regarding the adaptation to the terminal processing capability, the following technique may be considered. When the network requests, the terminal reports at least its static radio access capability. The gNB may request the UE to report the capability based on band information. If allowed by the network, a temporary capability limit request may be sent by the terminal to signal to the gNB the limited availability of some capability (dPfmf eg due to hardware sharing, interference or overheating). The gNB may then confirm or reject the request. Temporary capability restrictions must be transparent to 5GC. That is, only static functions are stored in 5GC.

Regarding the adaptation to obtain PDCCH monitoring/decoding reduction, the following technique may be considered. The UE monitors the PDCCH candidate set on a monitoring occasion configured in one or more configured CORESETs according to the corresponding search space configuration. CORESET is composed of a set of PRBs having a time interval of 1 to 3 OFDM symbols. Resource units REG and CCE are defined in CORESET, and each CCE is composed of a set of REGs. A control channel is formed of a set of CCEs. Different code rates for the control channel are implemented by aggregating different numbers of CCEs. Interleaved and non-interleaved CCE-REG mappings are supported in CORESET.

Regarding the power saving signal/channel/procedure for triggering terminal power consumption adaptation, the following technique may be considered. In order to enable reasonable terminal battery consumption when carrier aggregation (CA) is configured, an activation/deactivation mechanism of cells is supported. When one cell is deactivated, the UE does not need to receive a corresponding PDCCH or PDSCH, cannot perform corresponding uplink transmission, and does not need to perform channel quality indicator (CQI) measurement. Conversely, when one cell is activated, the UE needs to receive the PDCH and PDCCH (if the UE is configured to monitor the PDCCH from this SCell), and is expected to be able to perform CQI measurement. The NG-RAN prevents the SCell of the secondary PUCCH group (the group of SCells in which the PUCCH signaling is associated with the PUCCH of the PUCCH SCell) from being activated while the PUCCH SCell (secondary cell configured with PUCCH) is deactivated. The NG-RAN ensures that the SCell mapped to the PUCCH SCell is deactivated before the PUCCH SCell is changed or removed.

Upon reconfiguration without mobility control information, SCells added to the set of serving cells are initially deactivated, and SCells remaining in the set of serving cells (unchanged or reconfigured) do not change the activation state (active or inactive). .

SCells are deactivated upon reconfiguration with mobility control information (eg, handover).

In order to enable reasonable battery consumption when bandwidth adaptation (BA) is configured, only one uplink BWP and one downlink BWP or only one downlink/uplink BWP pair for each uplink carrier is active serving It can be activated at once in the cell, and all other BWPs configured in the terminal are deactivated. In the deactivated BWPs, the UE does not monitor the PDCCH and does not transmit on the PUCCH, PRACH and UL-SCH.

For BA, the reception and transmission bandwidth of the terminal need not be as wide as the bandwidth of the cell and can be adjusted: the width can be commanded to be changed (eg, a period of low activity to save power) while contracting), position in the frequency domain may shift (eg, to increase scheduling flexibility), and subcarrier spacing may be ordered to change (eg, to allow for different services). A subset of the total cell bandwidth of the cell is referred to as a bandwidth part (BWP) and BA is obtained by setting BWP(s) to the terminal and notifying the terminal that it is currently active among the configured BWPs. When the BA is configured, the UE only needs to monitor the PDCCH on one active BWP. That is, there is no need to monitor the PDCCH on the entire downlink frequency of the cell. A BWP inactive timer (independent of the DRX inactive timer described above) is used to switch the active BWP to the default BWP: the timer is restarted upon successful decoding of the PDCCH, and when the timer expires, switching to the default BWP occurs do.

10 illustrates a scenario in which three different bandwidth parts are set.

10 shows an example in _{which BWP 1} , BWP ₂ and BWP ₃ are set on a time-frequency resource. BWP ₁ may have a width of 40 MHz and a subcarrier spacing of 15 kHz, BWP ₂ may have a width of 10 MHz and a subcarrier spacing of 15 kHz, and BWP ₃ may have a width of 20 MHz and a subcarrier spacing of 60 kHz. In other words, each of the bandwidth parts may have a different width and/or a different subcarrier spacing.

Hereinafter, idle mode DRX will be described.

In idle mode, the UE can use DRX to reduce power consumption. One paging occasion (paging occasion; PO) is a P-RNTI (Paging-Radio Network Temporary Identifier) (which addresses a paging message for NB-IoT) PDCCH (Physical Downlink Control Channel) or MPDCCH (MTC PDCCH) ) or a subframe that can be transmitted through a narrowband PDCCH (NPDCCH).

In P-RNTI transmitted through MPDCCH, PO may indicate a start subframe of MPDCCH repetition. In the case of the P-RNTI transmitted through the NPDCCH, when the subframe determined by the PO is not a valid NB-IoT downlink subframe, the PO may indicate the start subframe of the NPDCCH repetition. Therefore, the first valid NB-IoT downlink subframe after PO is the start subframe of NPDCCH repetition.

One paging frame (PF) is one radio frame that may include one or a plurality of paging opportunities. When DRX is used, the UE only needs to monitor one PO per DRX cycle. One paging narrow band (PNB) is one narrow band in which the UE performs paging message reception. PF, PO, and PNB may be determined based on DRX parameters provided in system information.

According to FIG. 11 , the terminal may receive idle mode DRX configuration information from the base station through higher layer signaling (eg, system information) (S1110).

The UE may determine a Paging Frame (PF) and a Paging Occasion (PO) to monitor the PDCCH in the paging DRX cycle based on the idle mode DRX configuration information (S1120). In this case, the DRX cycle may include on duration and sleep duration (or DRX opportunity).

The UE may monitor the PDCCH in the PO of the determined PF (S1630). Here, for example, the UE monitors only one subframe (PO) per paging DRX cycle. In addition, when the terminal receives the PDCCH scrambled by the P-RNTI for the on-duration (ie, when paging is detected), the terminal may transition to the connected mode and transmit/receive data to/from the base station.

12 schematically illustrates an example of an idle mode DRX operation.

According to FIG. 12 , when there is traffic directed to a terminal in an RRC_IDLE state (hereinafter referred to as an 'idle state'), paging for the corresponding terminal occurs. The UE may wake up periodically (ie, every (paging) DRX cycle) to monitor the PDCCH. If paging does not exist, the terminal may transition to the connected state, receive data, and enter the sleep mode again if data does not exist.

Hereinafter, connected mode DRX (C-DRX) will be described.

C-DRX means DRX applied in the RRC connection state. The DRX cycle of C-DRX may consist of a short DRX cycle and/or a long DRX cycle. Here, a short DRX cycle may correspond to an option.

When C-DRX is configured, the UE may perform PDCCH monitoring for on-duration. If the PDCCH is successfully detected during PDCCH monitoring, the UE may operate (or run) an inactive timer and maintain an awake state. Conversely, if the PDCCH is not successfully detected during PDCCH monitoring, the UE may enter the sleep state after the on-duration ends.

When C-DRX is configured, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be configured non-contiguously based on the C-DRX configuration. In contrast, if C-DRX is not configured, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously configured in the present specification.

On the other hand, PDCCH monitoring may be limited to a time interval set by a measurement gap (gap) regardless of the C-DRX configuration.

The terminal may receive RRC signaling (eg, MAC-MainConfig IE) including DRX configuration information from the base station (S1310).

Here, the DRX configuration information may include the following information.

- onDurationTimer: the number of PDCCH subframes that can be continuously monitored at the beginning of the DRX cycle

- drx-InactivityTimer: the number of PDCCH subframes that can be continuously monitored when the UE decodes the PDCCH having scheduling information

- drx-RetransmissionTimer: the number of PDCCH subframes to be continuously monitored when HARQ retransmission is expected

- longDRX-Cycle: on-duration period

- drxStartOffset: subframe number at which DRX cycle starts

- drxShortCycleTimer: short DRX cycle number

- shortDRX-Cycle: DRX cycle that runs as many as drxShortCycleTimer when Drx-InactivityTimer ends

In addition, when DRX 'ON' is configured through the DRX command of the MAC CE (command element) (S1320), the UE monitors the PDCCH for the ON duration of the DRX cycle based on the DRX configuration (S1330).

14 schematically illustrates an example of C-DRX operation.

When the UE receives scheduling information (eg, DL Grant) in the RRC_CONNECTED state (which may be referred to as a connected state hereinafter), the UE may execute the DRX inactive timer and the RRC inactive timer.

When the DRX inactive timer expires, the DRX mode may be started. The UE wakes up from the DRX cycle and may monitor the PDCCH (on the duration timer) for a predetermined time.

In this case, when short DRX is configured, when the UE starts the DRX mode, the UE first starts with a short DRX cycle, and after the short DRX cycle ends, it starts with a long DRX cycle. Here, the long DRX cycle may correspond to a multiple of the short DRX cycle. In addition, in a short DRX cycle, the UE may wake up more frequently. After the RRC inactive timer expires, the UE may switch to an IDLE state and perform an IDLE mode DRX operation.

이하에서는, 본 명세서의 제안에 대해 더욱 상세히 설명한다.Hereinafter, the proposal of the present specification will be described in more detail.

Additional advantages, objects, and features of the present disclosure will be set forth in part in the description that follows, and will become apparent to those skilled in the art upon reviewing the following, or may be learned, in part, from the practice of the disclosure. The objects and other advantages of the present specification may be realized and attained by means of the appended drawings as well as the appended claims and the structures particularly pointed out in the claims.

The present disclosure proposes a method for monitoring a control channel (eg, PDCCH) and an apparatus using the method.

The following techniques can be used in various radio access systems such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with a radio technology such as Global System for Mobile communications (GSM)/General Packet Radio Service (GPRS)/Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented with a radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), and the like. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA and LTE-A (Advanced)/LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE/LTE-A/LTE-A pro.

For clarity of explanation, description is based on a 3GPP communication system (eg, LTE-A, NR), but the technical spirit of the present specification is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. In detail, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE/NR may be referred to as a 3GPP system. "xxx" means standard document detail number. LTE/NR may be collectively referred to as a 3GPP system. For backgrounds, terms, abbreviations, etc. used in the description of the present specification, reference may be made to matters described in standard documents published before this specification.

In the Rel-16 NR system, a power saving scheme has been discussed in order to reduce the power consumption (consumption) of the UE, and a wake up instruction (indication), SCell dormancy (dormancy) instruction, Minimum applicable K0/K2 and the like were introduced.

Here, the wake-up indication is a scheme for instructing whether to actually perform PDCCH monitoring in each DRX cycle when performing the DRX option with a wake-up indication, which is a newly introduced DCI format. It may be delivered to the UE through 2_6.

The SCell sleep indication serves to inform whether to perform PDCCH monitoring for each SCell (group) in order to reduce unnecessary SCell monitoring, and in outside active time, through DCI format 2_6, inside active time (inside active time) time) may be transmitted through DCI format 1_1, etc.

The minimum applicable K0 / K2 indicates the minimum offset between the PDCCH and the PDSCH (PUSCH) in cross-slot scheduling, and the UE monitors the PDCCH during the period guaranteed by the offset. introduced to reduce the power required for

In Rel-17, PDCCH monitoring adaptation (adaptation), a power saving scheme for IDLE / INACTIVE UE will be discussed further. Here, the PDCCH monitoring adaptation may mean a scheme for dynamically adjusting the PDCCH monitoring operation, and a search space set/CORESET activation/deactivation, search Adaptation to space set configuration and the like may be considered.

Among them, adaptation to the monitoring period (periodicity) can be implemented by dynamically changing the monitoring period of each search space set set by the search space set setting, and the network By changing the monitoring period of the UE with a small amount of traffic) to a large value, power consumption of the UE can be reduced.

In this specification, a setting and a method necessary for adapting a monitoring cycle are proposed. The suggestions below can be implemented alone or in combination.

Hereinafter, embodiments of the present specification will be described with reference to the drawings. The following drawings were created to explain a specific example of the present specification. Since the names of specific devices described in the drawings or the names of specific signals/messages/fields are presented by way of example, the technical features of the present specification are not limited to the specific names used in the following drawings.

According to FIG. 15 , the terminal may receive discontinuous reception (DRX) configuration information from the base station (S1510). Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

The terminal may receive information on the change of the PDCCH monitoring period from the base station (S1520). Here, the information on the change of the PDCCH monitoring period may be information on a new PDCCH monitoring period for performing the PDCCH monitoring. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

The UE may perform the PDCCH monitoring based on the DRX configuration information and the information on the PDCCH monitoring period change (S1530). Here, based on the fact that the new PDCCH monitoring period is a multiple or a divisor of the existing PDCCH monitoring period of the terminal, the new PDCCH monitoring period may be effective for the terminal. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

Meanwhile, an example in which a new PDCCH monitoring period is effective for the terminal may be described as follows. That is, it is assumed that the change of the monitoring period is effective only when it is a multiple/divisor of the previous period (and/or the default value). (and/or it may be assumed that only changes to multiples/divisors of the previous period (and/or default values) are possible.)

For example, based on the value of the new PDCCH monitoring period being greater than the value of the existing PDCCH monitoring period, the new PDCCH monitoring period may be a multiple of the existing PDCCH monitoring period. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

For example, based on the value of the new PDCCH monitoring period being smaller than the value of the existing PDCCH monitoring period, the new PDCCH monitoring period may be a divisor of the existing PDCCH monitoring period. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

Meanwhile, the change of the monitoring period may be performed through DCI, MAC message, higher layer signaling, timer, and the like.

As an example, the terminal receives the information on the change of the PDCCH monitoring period through DCI, and the information on the change of the PDCCH monitoring period includes any one of a plurality of preset candidate PDCCH monitoring periods to perform the PDCCH monitoring. It can be notified as a new PDCCH monitoring cycle for Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

For example, the terminal receives the information on the change of the PDCCH monitoring period through higher layer signaling, and the higher layer signaling may be one of a radio resource control (RRC) message or a medium access control (MAC) message. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

As an example, the UE starts a specific timer when starting the PDCCH monitoring based on the new PDCCH monitoring period, and when the specific timer expires, the UE monitors the PDCCH based on a preset PDCCH monitoring period. can be done Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

Meanwhile, the period change may be performed for each search space set or for each BWP (or serving cell) unit.

For example, the PDCCH monitoring period change may be applied in units of a search space set, a unit of bandwidth part (BWP), or units of a serving cell. Here, on the basis that the PDCCH monitoring period change is applied in units of the search space set, the PDCCH monitoring period change may be applied only to a search space set specific to the UE. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

For example, the existing PDCCH monitoring period may be a PDCCH monitoring period configured to the terminal before the terminal receives the information on the change of the PDCCH monitoring period. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

For example, based on the application of the minimum applicable K0 value for cross-slot scheduling to the terminal, the delay value of application to the PDCCH monitoring period change is the same as the delay value of application to the minimum applicable KO value, and , the minimum applicable K0 may be information indicating a minimum offset between a PDCCH and a physical downlink shared channel (PDSCH) or between the PDCCH and a physical uplink shared channel (PUSCH) in the cross-slot scheduling. Since more specific examples of the present content are the same as those described above and/or will be described later, repeated descriptions of overlapping content will be omitted.

Hereinafter, embodiments of the present specification will be described in more detail.

<모니터링 주기 적응(adaptation)><Monitoring cycle adaptation>

An important aspect to be considered in the dynamic power saving scheme is that when the UE cannot detect the corresponding indication, the impact thereof must be minimized.

For example, if the monitoring period of the search space set having a monitoring period of 2 ms is changed to 5 ms, the UE that does not find the corresponding indication performs PDCCH monitoring every 2 ms (due to different understanding of the network and the UE) A slot in which the actual UE can discover DCI may exist every 10 ms. In this case, by changing the monitoring period to 4 ms, 6 ms, etc., it may be important to reduce the offset between slots in which the DCI can be discovered even if the UE misses the corresponding indication.

In order to solve this problem, in the present specification, when adjusting the period of the search space set, it is proposed to consider the following matter(s). All or part of the following proposals may be actually implemented, and each proposal may be implemented alone or in combination. Below, the default value means the monitoring cycle set by the search space set setting.

1. It is assumed that the change of monitoring cycle is effective only if it is a multiple/divisor of the previous cycle (and/or default value). (and/or it may assume that only changes to multiples/divisors of the previous period (and/or default) are possible.)

A. As one of the methods of indicating a cycle corresponding to a multiple/divisor of the previous cycle, it may be instructed to skip monitoring for some of the monitoring opportunity(s) designated by the previous cycle. For example, if a cycle corresponding to twice the previous cycle is to be applied, it may be instructed to actually monitor only the odd-numbered monitoring opportunity(s) among the monitoring opportunity(s) designated by the previous cycle.

B. Additionally, the monitoring cycle may be changed in the following way.

i. When the monitoring period is changed from a small value to a large value, the value after the change may be designated as a multiple (e.g., 2, 3, ..., 10, ... times) of the value before the change. Also in this case, the period change may be indicated by a MAC message or (or) L1 signaling (DCI).

ii. When the monitoring period is changed from a large value to a small value, the value after the change can be designated as a divisor (eg, 1/2, 1/3, ..., 1/10, … times) of the value before the change. . Alternatively, changing the period from a large value to a small value may allow only a return to the monitoring period (default value) configured in the search space set. Also, in this case, the period change may be indicated by a MAC message or L1 signaling (DCI), or a return time to the default value may be determined by a timer. (The timer value is predefined or indicated by the network (via higher layer signaling (the higher layer signaling may be one of a radio resource control (RRC) message or a medium access control (MAC) message), etc.) may be

2. Change of the monitoring period is to be performed through DCI, MAC message, higher layer signaling (the higher layer signaling may be one of a radio resource control (RRC) message or a medium access control (MAC) message), a timer, etc. can

A. Each transmission medium may have a different scope of change. For example, DCI may only be able to change between the period candidate(s)/default value indicated in advance through pre-definition or through higher layer signaling. On the other hand, higher layer signaling, such as RRC signaling and MAC message, has no overhead burden compared to DCI, so more free cycle switching may be possible compared to DCI. (For example, information on a changed cycle may be delivered through higher layer signaling without prior information or indication on a cycle candidate, etc.) In the case of a timer, a time point at which to fall back to a default value in a changed cycle is determined. It can be useful as a way to inform.

3. Period change may be performed for each search space set or BWP (or serving cell) unit.

A. In addition, whether the SS set level cycle change or the BWP level cycle change may be set by the network. (SS set level period change may be performed for each SS set group, and in this case, the SS set group is determined by predefined (eg, assuming that the SS set(s) monitoring the same RNTI is one group)) Or, it may be indicated through higher layer signaling of the network (the higher layer signaling may be one of a radio resource control (RRC) message or a medium access control (MAC) message) or the like.)

B. Additionally, the SS set level/BWP level periodic change may be applied by limiting the UE-specific (user-specific) search space set (USS set). In this case, in the case of a common search space set (CSS set), a plurality of UEs may be associated with the corresponding CSS set, and among the corresponding UEs, a UE that does not require power saving or a UE without power saving capability exists. may be useful if

C. BWP (or serving cell) level monitoring period adaptation (adaptation) may mean adjusting the monitoring period of all SS sets set in the corresponding (active) BWP. In this case, it may be preferable that the monitoring period be signaled in the form of multiples/divisors of the existing monitoring period (or default value) rather than an absolute value (e.g., 10ms, 20ms, ...).

As an example, when the monitoring period of all SS sets set in a specific BWP is collectively increased by 10 ms, the UE may perform blind decoding of each slot and/or channel estimation for each slot based on the corresponding setting. A process of re-calculating and applying the number of CCEs may be added, which may increase the implementation complexity of the UE.

In order to solve this problem, it is preferable that the BWP (or serving cell) level monitoring cycle adaptation signals a multiple/divisor relationship of the existing monitoring cycle, so that the value is in all (or specific) SS set(s) can be applied. As an example, the network may instruct the UE to collectively double the monitoring period for all search space sets defined in the currently active BWP.

D. Additionally, grouping the SS set(s) to be set in a specific BWP, and adjusting the monitoring period for each group is also self-evident within the scope of the present specification. For example, the network may divide the SS set(s) configured for a specific UE into two groups and adjust the period for each group.

Meanwhile, the embodiments of the present specification described above may also be applied to the following embodiment(s).

<모니터링 주기 의 오프셋 설정 방법><How to set the offset of the monitoring cycle>

In the current specification (e.g. TS38.331, etc.), the monitoring period of the SS set may be indicated in the following format. The following content may correspond to an example of the search space information elements.

[Table 4]

As can be seen from the above (eg monitoringSlotPeriodicityAndOffset ), the network indicates the monitoring period and the offset value together when setting the monitoring period of the SS set. This means that even if the UE succeeds in receiving the monitoring cycle change, if the network and the UE have different understanding of the offset, a problem of understanding the location of a monitoring opportunity may occur differently. Therefore, in the present specification, the monitoring cycle change The time offset value is also set together, or the offset value is predefined or higher layer signaling of the network (the higher layer signaling may be one of a radio resource control (RRC) message or a medium access control (MAC) message), etc. It is suggested to be directed by Specifically, the following method may be applied. The following methods may be implemented alone or in combination. (In this specification, the old cycle means the cycle before the cycle change (or the cycle of setting the SS set), and the new cycle means the cycle after the cycle change.) Also, the option to be actually applied depends on the network. may be set by

Option 1) Implicit Determination of Offset Values

The simplest way to set the offset is to assume that the changed offset value maintains the offset value of the old period. It maintains the offset value of the old period as it is, or the remaining value obtained by dividing the offset value of the old period by the new period (ie, (old period) modulo(new period)) It may be implemented by a method of setting ? as a new (new) offset. This may be useful when the new period is a multiple/divisor of the old period.

Option 2) Explicit indication of offset value

As another method, the network may indicate the offset value of the new period together with the new period. This may be useful when setting a new period using the existing SS set setting. This indicates a primary configuration (eg a default configuration) and a secondary configuration (eg a configuration for power saving purposes) for one SS set configuration, and implements a dynamic change using a MAC message or DCI, etc. It may be implemented using a method such as

Meanwhile, the embodiments of the present specification described above may also be applied to the following embodiments.

<모니터링 주기 적응(adaptation) 적용 시점><Time of application of monitoring cycle adaptation>

When a new period & offset is indicated, there is a problem that understanding of a monitoring opportunity may be different between the network and the UE if the timing at which the corresponding value is applied is not accurate.

In order to solve this problem, in the present specification, the application time of a new period & offset is proposed as follows. The following methods may be implemented alone or in combination. Also, an alternative to be actually applied may be set by the network.

- Alternative 1) Among the monitoring opportunities determined by the given new cycle & offset, the closest of the monitoring opportunities (occasions) that are closest to or more than X slot(s) away from the slot instructed for the new cycle It is possible to apply a new (new) period & offset changed from the monitoring opportunity (occasion).

- When the minimum applicable K0 (/K2) for cross-slot scheduling is set (that is, the UE performs micro sleep during the slot corresponding to the minimum applicable K0, or low power PDCCH decoding ), its X value may be assumed to be equal to the application delay of the minimum applicable K0, or it may be assumed to be equal to the minimum applicable K0 value.

- Alternative 2) If the new cycle does not include an offset (or if the new cycle follows the offset of the old cycle), the new cycle is applied from the slot in which the cycle change is indicated. It may be assumed that That is, the UE that has been instructed to a new cycle “M” in the slot “N” performs monitoring on the corresponding SS set in the slot “N+M”, and then monitors the corresponding SS set at the “M” slot interval. can be performed.

Meanwhile, the contents of the above-described embodiments may be described from another perspective as follows.

The following drawings were created to explain a specific example of the present specification. Since the names of specific devices described in the drawings or the names of specific signals/messages/fields are presented by way of example, the technical features of the present specification are not limited to the specific names used in the following drawings.

According to FIG. 16 , the terminal may receive discontinuous reception (DRX) configuration information from the base station (S1610). Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

The terminal may receive information on the change of the PDCCH monitoring period from the base station (S1620). Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

The UE may perform the PDCCH monitoring based on the DRX configuration information and the information on the PDCCH monitoring period change (S1630). Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

Here, the information on the change of the PDCCH monitoring period may be information on a new PDCCH monitoring period for performing the PDCCH monitoring. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

Here, based on the fact that the new PDCCH monitoring period is a multiple or a divisor of the existing PDCCH monitoring period of the terminal, the new PDCCH monitoring period may be effective for the terminal. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

Referring to FIG. 17 , the processor 1700 may include a setting information receiving unit 1710 , a period change information receiving unit 1720 , and a monitoring receiving unit 1730 . Here, the processor 1700 may correspond to a processor to be described later (or described above).

The configuration information receiving unit 1710 may be configured to control the transceiver to receive discontinuous reception (DRX) configuration information from the base station. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

The period change information receiver 1720 may be configured to control the transceiver to receive information about a change in a physical downlink control channel (PDCCH) monitoring period from the base station. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

The monitoring receiving unit 1730 may be configured to perform PDCCH monitoring based on the DRX configuration information and information on the PDCCH monitoring period change. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

Meanwhile, although not shown separately, in the present specification, the following embodiments may also be provided.

According to an embodiment, an apparatus includes at least one memory and at least one processor operatively coupled with the at least one memory, the processor comprising: a transceiver to receive discontinuous reception (DRX) configuration information from a base station is configured to control the transceiver to receive information on a change in a physical downlink control channel (PDCCH) monitoring period from the base station, and the DRX configuration information and the PDCCH monitoring period change information based on the PDCCH configured to perform monitoring, wherein the information on the change of the PDCCH monitoring period is information on a new PDCCH monitoring period for performing the PDCCH monitoring, and the new PDCCH monitoring period is a multiple or a divisor of the existing PDCCH monitoring period of the terminal Based on , the new PDCCH monitoring period may be an apparatus characterized in that it is effective for the terminal.

According to another embodiment, in at least one computer readable medium including instructions based on being executed by at least one processor, the at least one processor is configured to control the transceiver to receive discontinuous reception (DRX) configuration information from the base station, and to control the transceiver to receive information about a change in a physical downlink control channel (PDCCH) monitoring period from the base station, and the DRX configured to perform PDCCH monitoring based on configuration information and information on the PDCCH monitoring period change, wherein the PDCCH monitoring period change information is information on a new PDCCH monitoring period for performing the PDCCH monitoring, the new PDCCH Based on the monitoring period being a multiple or a divisor of the existing PDCCH monitoring period of the terminal, the new PDCCH monitoring period may be effective for the terminal.

18, the base station may transmit the DRX configuration information to the terminal (S1810). Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

The base station may transmit information about a change in a physical downlink control channel (PDCCH) monitoring period to the terminal (S1820). Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

Here, the information on the change of the PDCCH monitoring period may be information on a new PDCCH monitoring period for performing PDCCH monitoring by the terminal. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

Referring to FIG. 19 , the processor 1900 may include a setting information transmitter 1910 and a period change information transmitter 1920 . Here, the processor 1900 may correspond to a processor to be described later (or described above).

The configuration information transmitter 1910 may be configured to control the transceiver to transmit discontinuous reception (DRX) configuration information to the terminal. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

The period change information transmitter 1920 may be configured to control the transceiver to transmit information on a change in a physical downlink control channel (PDCCH) monitoring period to the terminal. Since a more specific example of the present content is the same as described above, repeated description of the overlapping content will be omitted.

20 illustrates a communication system 1 applied to this specification.

Referring to FIG. 20 , the communication system 1 applied to the present specification includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a radio access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device. Although not limited thereto, the wireless device includes a robot 100a, a vehicle 100b-1, 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, and a home appliance 100e. ), an Internet of Things (IoT) device 100f, and an AI device/server 400 . For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR devices include AR (Augmented Reality)/VR (Virtual Reality)/MR (Mixed Reality) devices, and include a Head-Mounted Device (HMD), a Head-Up Display (HUD) provided in a vehicle, a television, a smartphone, It may be implemented in the form of a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like. The portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a laptop computer), and the like. Home appliances may include a TV, a refrigerator, a washing machine, and the like. The IoT device may include a sensor, a smart meter, and the like. For example, the base station and the network may be implemented as a wireless device, and a specific wireless device 200a may operate as a base station/network node to other wireless devices.

Here, the wireless communication technology implemented in the wireless device of the present specification may include a narrowband Internet of Things for low-power communication as well as LTE, NR, and 6G. At this time, for example, the NB-IoT technology may be an example of a LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat NB1 and/or LTE Cat NB2, and is limited to the above-mentioned names. no. Additionally or alternatively, the wireless communication technology implemented in the wireless device of the present specification may perform communication based on LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN technology, and may be called by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology is 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine It may be implemented in at least one of various standards such as Type Communication, and/or 7) LTE M, and is not limited to the above-described name. Additionally or alternatively, the wireless communication technology implemented in the wireless device of the present specification may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low power communication. and is not limited to the above-mentioned names. For example, the ZigBee technology can create PAN (personal area networks) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.

The wireless devices 100a to 100f may be connected to the network 300 through the base station 200 . AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f , and the wireless devices 100a to 100f may be connected to the AI server 400 through the network 300 . The network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may also communicate directly (e.g. sidelink communication) without passing through the base station/network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. Vehicle to Vehicle (V2V)/Vehicle to everything (V2X) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensor) or other wireless devices 100a to 100f.

Wireless communication/

connection

150a, 150b, and 150c may be performed between the wireless devices 100a to 100f/base station 200 and the base station 200/base station 200 . Here, the wireless communication/connection includes uplink/downlink communication 150a and sidelink communication 150b (or D2D communication), and communication between base stations 150c (eg relay, IAB (Integrated Access Backhaul)). This can be done through technology (eg 5G NR) Wireless communication/

connection

150a, 150b, 150c allows the wireless device and the base station/radio device, and the base station and the base station to transmit/receive wireless signals to each other. For example, the wireless communication/

connection

150a, 150b, and 150c may transmit/receive signals through various physical channels.To this end, based on various proposals of the present specification, At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation processes, etc. may be performed.

On the other hand, NR supports a number of numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when SCS is 15kHz, it supports a wide area in traditional cellular bands, and when SCS is 30kHz/60kHz, dense-urban, lower latency and a wider carrier bandwidth, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz to overcome phase noise.

The NR frequency band may be defined as a frequency range of two types (FR1, FR2). The numerical value of the frequency range may be changed, and for example, the frequency ranges of the two types (FR1, FR2) may be as shown in Table 5 below. For convenience of explanation, among the frequency ranges used in the NR system, FR1 may mean “sub 6GHz range” and FR2 may mean “above 6GHz range” and may be called millimeter wave (mmW). .

Frequency Range designationFrequency Range designation	Corresponding frequency range Corresponding frequency range	Subcarrier SpacingSubcarrier Spacing
FR1FR1	450MHz - 6000MHz450MHz - 6000MHz	15, 30, 60kHz15, 30, 60 kHz
FR2FR2	24250MHz - 52600MHz24250MHz - 52600MHz	60, 120, 240kHz60, 120, 240 kHz

As mentioned above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a band of 410 MHz to 7125 MHz as shown in Table 6 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, for example, for communication for a vehicle (eg, autonomous driving).

Frequency Range designationFrequency Range designation	Corresponding frequency range Corresponding frequency range	Subcarrier SpacingSubcarrier Spacing
FR1FR1	410MHz - 7125MHz410MHz - 7125MHz	15, 30, 60kHz15, 30, 60 kHz
FR2FR2	24250MHz - 52600MHz24250MHz - 52600MHz	60, 120, 240kHz60, 120, 240 kHz

Hereinafter, an example of a wireless device to which the present specification is applied will be described. FIG. 21 exemplifies a wireless device applicable to the present specification. Referring to FIG. 21 , a first wireless device 100 and a second wireless device 200 may transmit and receive radio signals through various radio access technologies (eg, LTE, NR). Here, {first wireless device 100, second wireless device 200} is {wireless device 100x, base station 200} of FIG. 20 and/or {wireless device 100x, wireless device 100x) } can be matched.

The first wireless device 100 includes one or more processors 102 and one or more memories 104 , and may further include one or more transceivers 106 and/or one or more antennas 108 . The processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. For example, the processor 102 may process the information in the memory 104 to generate the first information/signal, and then transmit a wireless signal including the first information/signal through the transceiver 106 . In addition, the processor 102 may receive the radio signal including the second information/signal through the transceiver 106 , and then store the information obtained from the signal processing of the second information/signal in the memory 104 . The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102 . For example, the memory 104 may provide instructions for performing some or all of the processes controlled by the processor 102 , or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. may store software code including Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 106 may be coupled with the processor 102 , and may transmit and/or receive wireless signals via one or more antennas 108 . The transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In this specification, a wireless device may refer to a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 , one or more memories 204 , and may further include one or more transceivers 206 and/or one or more antennas 208 . The processor 202 controls the memory 204 and/or the transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. For example, the processor 202 may process the information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206 . In addition, the processor 202 may receive the radio signal including the fourth information/signal through the transceiver 206 , and then store information obtained from signal processing of the fourth information/signal in the memory 204 . The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202 . For example, the memory 204 may provide instructions for performing some or all of the processes controlled by the processor 202 , or for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein. may store software code including Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and/or receive wireless signals via one or more antennas 208 . The transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In this specification, a wireless device may refer to a communication modem/circuit/chip.

Hereinafter, hardware elements of the

wireless devices

100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or

more processors

102 , 202 . For example, one or

more processors

102 , 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or

more processors

102, 202 may be configured to process one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, function, procedure, proposal, method, and/or operational flowcharts disclosed herein. can create One or

more processors

102, 202 may generate messages, control information, data, or information according to the description, function, procedure, proposal, method, and/or flow charts disclosed herein. The one or

more processors

102 and 202 generate a signal (eg, a baseband signal) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and/or methods disclosed in this document. , to one or

more transceivers

106 and 206 . The one or

more processors

102 , 202 may receive signals (eg, baseband signals) from one or

more transceivers

106 , 206 , and may be described, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein. PDUs, SDUs, messages, control information, data, or information may be acquired according to the above.

One or

more processors

102 , 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or

more processors

102, 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or

more processors

102 , 202 . The descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed in this document may be implemented using firmware or software, which may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, proposals, methods, and/or flow charts disclosed herein provide that firmware or software configured to perform is included in one or

more processors

102 , 202 , or stored in one or

more memories

104 , 204 . It may be driven by the

above processors

102 and 202 . The descriptions, functions, procedures, suggestions, methods, and/or flowcharts of operations disclosed herein may be implemented using firmware or software in the form of code, instructions, and/or a set of instructions.

One or

more memories

104 , 204 may be coupled with one or

more processors

102 , 202 and may store various forms of data, signals, messages, information, programs, code, instructions, and/or instructions. One or

more memories

104 , 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof. One or

more memories

104 , 204 may be located inside and/or external to one or

more processors

102 , 202 . In addition, one or

more memories

104 , 204 may be coupled to one or

more processors

102 , 202 through various technologies, such as wired or wireless connections.

One or

more transceivers

106 , 206 may transmit user data, control information, radio signals/channels, etc. referred to in the methods and/or operational flowcharts of this document to one or more other devices. One or

more transceivers

106, 206 may receive user data, control information, radio signals/channels, etc. referred to in the descriptions, functions, procedures, suggestions, methods and/or flow charts, etc. disclosed herein, from one or more other devices. have. For example, one or

more transceivers

106 , 206 may be coupled to one or

more processors

102 , 202 and may transmit and receive wireless signals. For example, one or

more processors

102 , 202 may control one or

more transceivers

106 , 206 to transmit user data, control information, or wireless signals to one or more other devices. In addition, one or

more processors

102 , 202 may control one or

more transceivers

106 , 206 to receive user data, control information, or wireless signals from one or more other devices. Further, one or

more transceivers

106, 206 may be coupled to one or

more antennas

108, 208, and the one or

more transceivers

106, 206 may be coupled via one or

more antennas

108, 208 to the descriptions, functions, and functions disclosed herein. , procedures, proposals, methods and/or operation flowcharts, etc. may be set to transmit and receive user data, control information, radio signals/channels, and the like. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). The one or

more transceivers

106, 206 convert the received radio signal/channel, etc. from the RF band signal to process the received user data, control information, radio signal/channel, etc. using the one or

more processors

102, 202. It can be converted into a baseband signal. One or

more transceivers

106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or

more processors

102 and 202 from baseband signals to RF band signals. To this end, one or

more transceivers

106 , 206 may include (analog) oscillators and/or filters.

22 , a wireless device may include at least one

processor

102 , 202 , at least one

memory

104 , 204 , at least one

transceiver

106 , 206 , and one or

more antennas

108 , 208 . have.

As a difference between the example of the wireless device described above in FIG. 21 and the example of the wireless device in FIG. 22 , in FIG. 21 , the

processors

102 and 202 and the

memories

104 and 204 are separated, but in the example of FIG. 22 , the processor The point is that

memories

104 and 204 are included in (102, 202).

Here, the specific descriptions of the

processors

102, 202, the

memories

104, 204, the

transceivers

106, 206, and the one or

more antennas

108, 208 are as described above, so to avoid unnecessary repetition of the description, A description of the repeated description will be omitted.

Hereinafter, an example of a signal processing circuit to which this specification is applied will be described.

23 illustrates a signal processing circuit for a transmission signal.

Referring to FIG. 23 , the signal processing circuit 1000 may include a scrambler 1010 , a modulator 1020 , a layer mapper 1030 , a precoder 1040 , a resource mapper 1050 , and a signal generator 1060 . have. Although not limited thereto, the operations/functions of FIG. 23 may be performed by the

processors

102 and 202 and/or the

transceivers

106 and 206 of FIG. 21 . The hardware elements of FIG. 23 may be implemented in the

processors

102 , 202 and/or

transceivers

106 , 206 of FIG. 21 . For example, blocks 1010 to 1060 may be implemented in the

processors

102 and 202 of FIG. 21 . Further, blocks 1010 to 1050 may be implemented in the

processors

102 and 202 of FIG. 21 , and block 1060 may be implemented in the

transceivers

106 and 206 of FIG. 21 .

The codeword may be converted into a wireless signal through the signal processing circuit 1000 of FIG. 23 . Here, the codeword is a coded bit sequence of an information block. The information block may include a transport block (eg, a UL-SCH transport block, a DL-SCH transport block). The radio signal may be transmitted through various physical channels (eg, PUSCH, PDSCH).

Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 1010 . A scramble sequence used for scrambling is generated based on an initialization value, and the initialization value may include ID information of a wireless device, and the like. The scrambled bit sequence may be modulated by a modulator 1020 into a modulation symbol sequence. The modulation method may include pi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), and the like. The complex modulation symbol sequence may be mapped to one or more transport layers by the layer mapper 1030 . Modulation symbols of each transport layer may be mapped to corresponding antenna port(s) by the precoder 1040 (precoding). The output z of the precoder 1040 may be obtained by multiplying the output y of the layer mapper 1030 by the precoding matrix W of N*M. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 may perform precoding after performing transform precoding (eg, DFT transform) on the complex modulation symbols. Also, the precoder 1040 may perform precoding without performing transform precoding.

The resource mapper 1050 may map modulation symbols of each antenna port to a time-frequency resource. The time-frequency resource may include a plurality of symbols (eg, a CP-OFDMA symbol, a DFT-s-OFDMA symbol) in the time domain and a plurality of subcarriers in the frequency domain. The signal generator 1060 generates a radio signal from the mapped modulation symbols, and the generated radio signal may be transmitted to another device through each antenna. To this end, the signal generator 1060 may include an Inverse Fast Fourier Transform (IFFT) module and a Cyclic Prefix (CP) inserter, a Digital-to-Analog Converter (DAC), a frequency uplink converter, and the like. .

The signal processing process for the received signal in the wireless device may be configured in reverse of the signal processing process 1010 to 1060 of FIG. 23 . For example, the wireless device (eg, 100 and 200 in FIG. 21 ) may receive a wireless signal from the outside through an antenna port/transceiver. The received radio signal may be converted into a baseband signal through a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource de-mapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Accordingly, the signal processing circuit (not shown) for the received signal may include a signal restorer, a resource de-mapper, a postcoder, a demodulator, a descrambler, and a decoder.

Hereinafter, an example of using a wireless device to which the present specification is applied will be described.

24 shows another example of a wireless device applied to the present specification. The wireless device may be implemented in various forms according to use-examples/services (see FIG. 20 ).

Referring to FIG. 24 ,

wireless devices

100 and 200 correspond to

wireless devices

100 and 200 of FIG. 21 , and various elements, components, units/units, and/or modules ) can be composed of For example, the

wireless devices

100 and 200 may include a communication unit 110 , a control unit 120 , a memory unit 130 , and an additional element 140 . The communication unit may include communication circuitry 112 and transceiver(s) 114 . For example, communication circuitry 112 may include one or more processors 102,202 and/or one or more memories 104,204 of FIG. For example, transceiver(s) 114 may include one or

more transceivers

106 , 206 and/or one or

more antennas

108 , 208 of FIG. 21 . The control unit 120 is electrically connected to the communication unit 110 , the memory unit 130 , and the additional element 140 , and controls general operations of the wireless device. For example, the controller 120 may control the electrical/mechanical operation of the wireless device based on the program/code/command/information stored in the memory unit 130 . In addition, the control unit 120 transmits the information stored in the memory unit 130 to the outside (eg, another communication device) through the communication unit 110 through a wireless/wired interface, or through the communication unit 110 to the outside (eg, Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130 .

The additional element 140 may be configured in various ways according to the type of the wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an input/output unit (I/O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device includes a robot ( FIGS. 20 and 100a ), a vehicle ( FIGS. 20 , 100b-1 , 100b-2 ), an XR device ( FIGS. 20 and 100c ), a mobile device ( FIGS. 20 and 100d ), and a home appliance. (FIG. 20, 100e), IoT device (FIG. 20, 100f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate/environment device, It may be implemented in the form of an AI server/device ( FIGS. 20 and 400 ), a base station ( FIGS. 20 and 200 ), and a network node. The wireless device may be mobile or used in a fixed location depending on the use-example/service.

In FIG. 24 , various elements, components, units/units, and/or modules in the

wireless devices

100 and 200 may be entirely interconnected through a wired interface, or at least some of them may be wirelessly connected through the communication unit 110 . For example, in the

wireless devices

100 and 200 , the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130 and 140 ) are connected to the communication unit 110 through the communication unit 110 . It can be connected wirelessly. In addition, each element, component, unit/unit, and/or module within the

wireless device

100 , 200 may further include one or more elements. For example, the controller 120 may be configured with one or more processor sets. For example, the controller 120 may be configured as a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, a memory control processor, and the like. As another example, the memory unit 130 may include random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.

Hereinafter, the embodiment of FIG. 24 will be described in more detail with reference to the drawings.

25 illustrates a portable device applied to the present specification. The mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a laptop computer). A mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

Referring to FIG. 25 , the portable device 100 includes an antenna unit 108 , a communication unit 110 , a control unit 120 , a memory unit 130 , a power supply unit 140a , an interface unit 140b , and an input/output unit 140c . ) may be included. The antenna unit 108 may be configured as a part of the communication unit 110 . Blocks 110 to 130/140a to 140c respectively correspond to blocks 110 to 130/140 of FIG. 24 .

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations. The controller 120 may control components of the portable device 100 to perform various operations. The controller 120 may include an application processor (AP). The memory unit 130 may store data/parameters/programs/codes/commands necessary for driving the portable device 100 . Also, the memory unit 130 may store input/output data/information. The power supply unit 140a supplies power to the portable device 100 and may include a wired/wireless charging circuit, a battery, and the like. The interface unit 140b may support the connection between the portable device 100 and other external devices. The interface unit 140b may include various ports (eg, an audio input/output port and a video input/output port) for connection with an external device. The input/output unit 140c may receive or output image information/signal, audio information/signal, data, and/or information input from a user. The input/output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.

For example, in the case of data communication, the input/output unit 140c obtains information/signals (eg, touch, text, voice, image, video) input from the user, and the obtained information/signals are stored in the memory unit 130 . can be saved. The communication unit 110 may convert the information/signal stored in the memory into a wireless signal, and transmit the converted wireless signal directly to another wireless device or to a base station. Also, after receiving a radio signal from another radio device or base station, the communication unit 110 may restore the received radio signal to original information/signal. After the restored information/signal is stored in the memory unit 130 , it may be output in various forms (eg, text, voice, image, video, haptic) through the input/output unit 140c.

26 illustrates a vehicle or an autonomous driving vehicle applied to this specification. The vehicle or autonomous driving vehicle may be implemented as a mobile robot, vehicle, train, manned/unmanned aerial vehicle (AV), ship, or the like.

Referring to FIG. 26 , the vehicle or autonomous driving vehicle 100 includes an antenna unit 108 , a communication unit 110 , a control unit 120 , a driving unit 140a , a power supply unit 140b , a sensor unit 140c and autonomous driving. It may include a part 140d. The antenna unit 108 may be configured as a part of the communication unit 110 . Blocks 110/130/140a-140d correspond to blocks 110/130/140 of FIG. 24, respectively.

The communication unit 110 may transmit/receive signals (eg, data, control signals, etc.) to and from external devices such as other vehicles, base stations (eg, base stations, roadside units, etc.), servers, and the like. The controller 120 may control elements of the vehicle or the autonomous driving vehicle 100 to perform various operations. The controller 120 may include an Electronic Control Unit (ECU). The driving unit 140a may cause the vehicle or the autonomous driving vehicle 100 to run on the ground. The driving unit 140a may include an engine, a motor, a power train, a wheel, a brake, a steering device, and the like. The power supply unit 140b supplies power to the vehicle or the autonomous driving vehicle 100 , and may include a wired/wireless charging circuit, a battery, and the like. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like. The sensor unit 140c includes an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight sensor, a heading sensor, a position module, and a vehicle forward movement. / may include a reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, and the like. The autonomous driving unit 140d includes a technology for maintaining a driving lane, a technology for automatically adjusting speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and a technology for automatically setting a route when a destination is set. technology can be implemented.

For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The controller 120 may control the driving unit 140a to move the vehicle or the autonomous driving vehicle 100 along the autonomous driving path (eg, speed/direction adjustment) according to the driving plan. During autonomous driving, the communication unit 110 may non/periodically acquire the latest traffic information data from an external server, and may acquire surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c may acquire vehicle state and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on the newly acquired data/information. The communication unit 110 may transmit information about a vehicle location, an autonomous driving route, a driving plan, and the like to an external server. The external server may predict traffic information data in advance using AI technology or the like based on information collected from the vehicle or autonomous vehicles, and may provide the predicted traffic information data to the vehicle or autonomous vehicles.

The claims described herein may be combined in various ways. For example, the technical features of the method claims of the present specification may be combined and implemented as an apparatus, and the technical features of the apparatus claims of the present specification may be combined and implemented as a method. In addition, the technical features of the method claim of the present specification and the technical features of the apparatus claim may be combined to be implemented as an apparatus, and the technical features of the method claim of the present specification and the technical features of the apparatus claim may be combined and implemented as a method.

Claims

A method of performing physical control channel (PDCCH) monitoring performed by a terminal in a wireless communication system, the method comprising:

receiving discontinuous reception (DRX) configuration information from the base station;

receiving information about a change in a PDCCH monitoring period from the base station; and

The PDCCH monitoring is performed based on the DRX configuration information and the PDCCH monitoring period change information,

The information on the change of the PDCCH monitoring period is information on a new PDCCH monitoring period for performing the PDCCH monitoring,

Based on the new PDCCH monitoring period being a multiple or a divisor of the existing PDCCH monitoring period of the terminal, the new PDCCH monitoring period is effective for the terminal.
The method according to claim 1, wherein the new PDCCH monitoring period is a multiple of the existing PDCCH monitoring period based on the value of the new PDCCH monitoring period being greater than the value of the existing PDCCH monitoring period.
The method of claim 1, wherein the new PDCCH monitoring period is a divisor of the existing PDCCH monitoring period based on the value of the new PDCCH monitoring period being smaller than the value of the existing PDCCH monitoring period.
The method of claim 1, wherein the terminal receives the information on the change of the PDCCH monitoring period through DCI,

The information on the change of the PDCCH monitoring period is characterized in that any one of a plurality of preset PDCCH monitoring periods is notified as a new PDCCH monitoring period for performing the PDCCH monitoring.
The method of claim 1, wherein the terminal receives the information on the change of the PDCCH monitoring period through higher layer signaling,

The upper layer signaling method, characterized in that one of a radio resource control (RRC) message or MAC (medium access control) message.
The method of claim 1, wherein the terminal starts a specific timer when starting to perform the PDCCH monitoring based on the new PDCCH monitoring period,

When the specific timer expires, the terminal performs the PDCCH monitoring based on a preset PDCCH monitoring period.
The method of claim 1, wherein the PDCCH monitoring period change is applied in units of a search space set, a unit of bandwidth part (BWP), or units of a serving cell.
The method of claim 7, wherein the PDCCH monitoring period change is applied only to a search space set specific to a UE based on the PDCCH monitoring period change being applied in units of the search space set.
The method of claim 1, wherein the existing PDCCH monitoring period is a PDCCH monitoring period configured for the terminal before the terminal receives the information on the change of the PDCCH monitoring period.
According to claim 1, Based on the application of the minimum applicable value of K0 for cross-slot scheduling to the terminal, the delay value of application to the PDCCH monitoring period change is the delay of application to the value of the minimum applicable KO. equal to the value,

The minimum applicable K0 is information indicating a minimum offset between a PDCCH and a physical downlink shared channel (PDSCH) or between the PDCCH and a physical uplink shared channel (PUSCH) in the cross-slot scheduling.
the terminal,

transceiver;

at least one memory; and

at least one processor operatively coupled to the at least one memory and the transceiver, the processor comprising:

and control the transceiver to receive discontinuous reception (DRX) configuration information from a base station;

configured to control the transceiver to receive information about a change in a physical downlink control channel (PDCCH) monitoring period from the base station; and

configured to perform PDCCH monitoring based on the DRX configuration information and information on the PDCCH monitoring period change,

The information on the change of the PDCCH monitoring period is information on a new PDCCH monitoring period for performing the PDCCH monitoring,

Based on the new PDCCH monitoring period being a multiple or a divisor of the existing PDCCH monitoring period of the terminal, the new PDCCH monitoring period is effective for the terminal.
The device is

at least one memory; and

at least one processor operatively coupled with the at least one memory, the processor comprising:

configured to control the transceiver to receive discontinuous reception (DRX) setting information from the base station;

configured to control the transceiver to receive information about a change in a physical downlink control channel (PDCCH) monitoring period from the base station; and

configured to perform PDCCH monitoring based on the DRX configuration information and information on the PDCCH monitoring period change,

The information on the PDCCH monitoring period change is information on a new PDCCH monitoring period for performing the PDCCH monitoring,

The new PDCCH monitoring period is effective for the terminal based on the new PDCCH monitoring period being a multiple or a divisor of the existing PDCCH monitoring period of the terminal.
At least one computer readable medium including instructions based on being executed by at least one processor, wherein the at least one processor comprises:

configured to control the transceiver to receive discontinuous reception (DRX) setting information from the base station;

configured to control the transceiver to receive information about a change in a physical downlink control channel (PDCCH) monitoring period from the base station; and

configured to perform PDCCH monitoring based on the DRX configuration information and information on the PDCCH monitoring period change,

The information on the PDCCH monitoring period change is information on a new PDCCH monitoring period for performing the PDCCH monitoring,

The new PDCCH monitoring period is effective for the terminal based on the new PDCCH monitoring period being a multiple or a divisor of the existing PDCCH monitoring period of the terminal.
A method for transmitting information on a change in a physical downlink control channel (PDCCH) monitoring period performed by a base station in a wireless communication system, the method comprising:

transmit discontinuous reception (DRX) configuration information to the terminal; and

Transmitting information on the change of the PDCCH monitoring period to the terminal,

The information on the PDCCH monitoring period change is information on a new PDCCH monitoring period for performing PDCCH monitoring by the terminal,

Based on the new PDCCH monitoring period being a multiple or a divisor of the existing PDCCH monitoring period of the terminal, the new PDCCH monitoring period is effective for the terminal.
base station,

transceiver;

at least one memory; and

at least one processor operatively coupled to the at least one memory and the transceiver, the processor comprising:

configured to control the transceiver to transmit discontinuous reception (DRX) configuration information to the terminal; and

configured to control the transceiver to transmit information on a change in a physical downlink control channel (PDCCH) monitoring period to the terminal,

The information on the PDCCH monitoring period change is information on a new PDCCH monitoring period for performing PDCCH monitoring by the terminal,

The base station, characterized in that the new PDCCH monitoring period is effective for the terminal on the basis that the new PDCCH monitoring period is a multiple or a divisor of the existing PDCCH monitoring period of the terminal.