WO2020222594A1

WO2020222594A1 - Method and apparatus for receiving physical downlink control channel by user equipment in wireless communication system

Info

Publication number: WO2020222594A1
Application number: PCT/KR2020/005838
Authority: WO
Inventors: 서인권; 안준기; 박창환
Original assignee: 엘지전자 주식회사
Priority date: 2019-05-02
Filing date: 2020-05-04
Publication date: 2020-11-05

Abstract

Proposed in the present specification is a method for receiving a physical downlink control channel (PDCCH) by a user equipment, wherein a CORESET/search space set configuration for the user equipment is changed in order to reduce power consumption of the user equipment.

Description

Method and apparatus for receiving a physical downlink control channel performed by a terminal in a wireless communication system

The present disclosure relates to wireless communication.

As more communication devices require a larger communication capacity, there is a need for improved mobile broadband communication compared to the existing radio access technology (RAT). In addition, massive Machine Type Communications (MTC), which provides various services anytime, anywhere by connecting multiple devices and objects, is one of the major issues to be considered in next-generation communications. In addition, a communication system design in consideration of a service/terminal sensitive to reliability and latency is being discussed. The introduction of a 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 disclosure, the technology is for convenience. Is called new RAT or NR.

The terminal's battery life is an important factor in the user experience that affects the adoption of 5G handsets and/or services. Power efficiency for 5G NR terminals is not worse than at least LTE, and a study of terminal power consumption is important in order to identify and apply a technology and design for improvement.

In order to reduce power consumption, it is possible to consider changing the CORESET/search space set setting of the terminal, and a specific method for monitoring and controlling this in the base station and a method for changing the control channel setting accordingly are required.

In the present specification, a method of saving power of a terminal by receiving a PDCCH using a change in the CORESET/search space set setting of the terminal is proposed.

According to the present specification, the CORESET/search space set setting may be changed to conserve power of the terminal, and the terminal may receive the PDCCH based on the changed CORESET/search space set setting. Accordingly, power efficiency and communication efficiency of the terminal are increased.

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

1 illustrates a wireless communication system to which the present disclosure can be applied.

2 is a block diagram showing a radio protocol architecture for a user plane.

3 is a block diagram showing a radio protocol structure for a control plane.

4 shows another example of a wireless communication system to which the technical features of the present disclosure may be applied.

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

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

7 shows a slot structure.

8 illustrates CORESET.

9 is a diagram showing a difference between a conventional control region and a CORESET in NR.

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

11 is an example of a self-contained slot structure.

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

13 shows a synchronization signal and a PBCH (SS/PBCH) block.

14 is for explaining a method for a terminal to obtain timing information.

15 shows an example of a process of obtaining system information of a terminal.

16 is for explaining a random access procedure.

17 is for explaining a power ramping carwonter.

18 is for explaining the concept of a threshold value of an SS block for RACH resource relationship.

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

20 illustrates the DRX cycle.

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

22 is a flowchart for an example of an operation between a network and a terminal for power saving.

23 is a flowchart of an example of a network operation for power saving.

24 is a flowchart illustrating an example of a method of receiving a PDCCH of a terminal according to some implementations of the present disclosure.

25 illustrates an example in which a method of receiving a PDCCH of a terminal according to some implementations of the present disclosure is applied.

26 illustrates another example in which a method of receiving a PDCCH of a terminal according to some implementations of the present disclosure is applied.

27 illustrates a communication system 1 applied to the present disclosure.

28 illustrates a wireless device applicable to the present disclosure.

29 illustrates a signal processing circuit for a transmission signal.

30 shows another example of a wireless device applied to the present disclosure.

31 illustrates a portable device applied to the present disclosure.

32 illustrates a vehicle or an autonomous vehicle applied to the present disclosure.

33 illustrates a vehicle applied to the present disclosure.

34 illustrates an XR device applied to the present disclosure.

35 illustrates a robot applied to the present disclosure.

36 illustrates an AI device applied to the present disclosure.

In the present 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, in the present specification, “A, B or C (A, B or C)” refers to “only A”, “only B”, “only C”, or “A, B, and any combination of C ( It can mean any combination of A, B and C)”.

A forward slash (/) or comma used in the present specification 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”.

In the present specification, “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".

In addition, in the present specification, “at least one of A, B and C” means “only A”, “only B”, “only C”, or “A, B and C Can mean any combination of A, B and C”. In addition, "at least one of A, B or C" or "at least one of A, B and/or C" means It can mean “at least one of A, B and C”.

In addition, parentheses used in the present specification 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” of the present specification is not limited to “PDCCH”, and “PDDCH” may be suggested as an example of “control information”. In addition, even when indicated as “control information (ie, PDCCH)”, “PDCCH” may be proposed as an example of “control information”.

The following technologies include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in a variety of wireless communication systems. 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 wireless technologies such as IEEE (institute of electrical and electronics engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with a system based on IEEE 802.16e. UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) that uses evolved-UMTS terrestrial radio access (E-UTRA), and employs OFDMA in downlink and SC in uplink. -Adopt FDMA. LTE-A (advanced) is an evolution of 3GPP LTE.

5G NR is the successor technology of LTE-A, and is a new clean-slate type mobile communication system with features such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, from low frequency bands of less than 1 GHz to intermediate frequency bands of 1 GHz to 10 GHz and high frequency (millimeter wave) bands of 24 GHz or higher.

In order to clarify the description, LTE-A or 5G NR is mainly described, but the technical idea of the present disclosure is not limited thereto.

1 illustrates a wireless communication system to which the present disclosure can be applied. This may also be referred to as an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), or a Long Term Evolution (LTE)/LTE-A system.

The E-UTRAN includes a base station (BS) 20 that provides a user equipment (UE) with a control plane and a user plane. The terminal 10 may be fixed or mobile, and may be referred to as other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), and a wireless device. . The base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.

The base stations 20 may be connected to each other through an X2 interface. The base station 20 is connected to an Evolved Packet Core (EPC) 30 through an S1 interface, more specifically, a Mobility Management Entity (MME) through an S1-MME and a Serving Gateway (S-GW) through an S1-U.

The EPC 30 is composed of MME, S-GW, and P-GW (Packet Data Network-Gateway). The MME has access information of the terminal or information on the capabilities of the terminal, and this information is mainly used for mobility management of the terminal. S-GW is a gateway with E-UTRAN as an endpoint, and P-GW is a gateway with PDN as an endpoint.

The layers of the Radio Interface Protocol between the terminal and the network are L1 (Layer 1) based on the lower three layers of the Open System Interconnection (OSI) standard model, which is widely known in communication systems. It can be divided into L2 (layer 2) and L3 (layer 3). Among them, the physical layer belonging to the first layer provides information transfer service using a physical channel. The RRC (Radio Resource Control) layer located in Layer 3 plays a role of controlling radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

2 is a block diagram showing a radio protocol architecture for a user plane. 3 is a block diagram showing a radio protocol structure for a control plane. The user plane is a protocol stack for transmitting user data, and the control plane is a protocol stack for transmitting control signals.

2 and 3, a physical layer (PHY) provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to an upper layer, a medium access control (MAC) layer, through a transport channel. Data moves between the MAC layer and the physical layer through the transport channel. Transport channels are classified according to how and with what characteristics data is transmitted through the air interface.

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

The functions of the MAC layer include mapping between a logical channel and a transport channel and multiplexing/demultiplexing of a MAC service data unit (SDU) belonging to the logical channel onto a transport block provided as a physical channel onto a transport channel. The MAC layer provides a service to the Radio Link Control (RLC) layer through a logical channel.

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

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

Functions of the Packet Data Convergence Protocol (PDCP) layer in the user plane include transmission 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.

Establishing the RB refers to a process of defining characteristics of a radio protocol layer and channel to provide a specific service, and setting specific parameters and operation methods for each. The RB can be further divided into SRB (Signaling RB) and DRB (Data RB). SRB is used as a path for transmitting RRC messages in the control plane, and 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 transport channel for transmitting data from a network to a terminal, there are a broadcast channel (BCH) for transmitting system information, and a downlink shared channel (SCH) for transmitting user traffic or control messages. In the case of downlink multicast or broadcast service traffic or control messages, they may be transmitted through a downlink SCH or a separate downlink multicast channel (MCH). Meanwhile, as an uplink transport channel for transmitting data from a terminal to a 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.

It is located above the transport channel, and the logical channels mapped to the transport channel include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), MTCH (Multicast Traffic). Channel).

The physical channel is composed 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 is composed of 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. The Transmission Time Interval (TTI) is a unit time of transmission, and may be, for example, a subframe or a slot.

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

Specifically, FIG. 4 shows a system architecture based on a 5G new radio access technology (NR) system. The entity used in the 5G NR system (hereinafter, simply referred to as “NR”) may absorb some or all functions of the entity introduced in FIG. 1 (eg, eNB, MME, S-GW). The entity used in the NR system may be identified by the name "NG" to distinguish it from LTE.

Referring to FIG. 4, the wireless communication system includes one or more UEs 11, a next-generation RAN (NG-RAN), and a fifth generation core network 5GC. The NG-RAN consists of at least one NG-RAN node. The NG-RAN node is an entity corresponding to the BS 20 shown in FIG. 1. The NG-RAN node is composed of at least one gNB (21) and/or at least one ng-eNB (22). The gNB 21 provides termination of the NR user plane and control plane protocols towards the UE 11. The Ng-eNB 22 provides termination of the E-UTRA user plane and control plane protocols towards the UE 11.

5GC includes an access and mobility management function (AMF), a user plane function (UPF), and a session management function (SMF). AMF hosts features such as NAS security, idle state mobility handling, and more. AMF is an entity that includes the functions of conventional MME. UPF hosts functions such as mobility anchoring and PDU (protocol data unit) processing. UPF is an entity that includes the functions of the conventional S-GW. SMF hosts functions such as UE IP address allocation and PDU session control.

The gNB and the ng-eNB are interconnected through the Xn interface. The gNB and ng-eNB are also connected to the 5GC through the NG interface. More specifically, it is connected to the AMF through the NG-C interface and to the UPF through the NG-U interface.

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

5, 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 setting and provision Functions such as (Measurement configuration & Provision) and dynamic resource allocation may be provided. AMF can provide functions such as NAS security and idle state mobility processing. UPF may provide functions such as mobility anchoring and PDU processing. SMF (Session Management Function) may provide functions such as terminal IP address allocation and PDU session control.

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

Referring to FIG. 6, a frame may consist of 10 milliseconds (ms), and may include 10 subframes of 1 ms.

In the NR, uplink and downlink transmission may be composed of frames. The radio frame has a length of 10 ms and may be defined as two 5 ms half-frames (HF). The half-frame may be defined as five 1ms subframes (Subframe, SF). The subframe is divided into one or more slots, and the number of slots in the subframe depends on Subcarrier Spacing (SCS). Each slot includes 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP). When a normal CP (normal CP) is used, each slot includes 14 symbols. When the extended CP is used, each slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or DFT-s-OFDM symbol).

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

Table 1 below illustrates the subcarrier spacing configuration μ.

The following Table 2 ^{exemplifies 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 the subcarrier spacing configuration μ. .

Table 3 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe (SF) according to the SCS when the extended CP is used.

In the NR system, OFDM(A) numerology (eg, SCS, CP length, etc.) may be differently set between a plurality of cells merged into one terminal. Accordingly, the (absolute time) section of the time resource (eg, SF, slot or TTI) (for convenience, collectively referred to as TU (Time Unit)) composed of the same number of symbols may be set differently between the merged cells.

7 shows a slot structure.

Referring to FIG. 7, a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 14 symbols, but in the case of an extended CP, one slot may include 12 symbols. Alternatively, in the case of a normal CP, one slot may include 7 symbols, but in the case of an extended CP, one slot may include 6 symbols.

The carrier includes a plurality of subcarriers in the frequency domain. Resource Block (RB) may be defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain. The BWP (Bandwidth Part) may be defined as a plurality of consecutive (P)RBs in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.). The carrier may include up to N (eg, 5) BWPs. Data communication can be performed through an activated BWP. Each element may be referred to as a resource element (RE) in the resource grid, and one complex symbol may be mapped.

The physical downlink control channel (PDCCH) may be composed of one or more control channel elements (CCEs) as shown in Table 4 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 consisting of 1, 2, 4, 8 or 16 CCEs. Here, the CCE is composed of six REGs (resource element group), 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 the NR, a new unit called a control resource set (CORESET) can be introduced. The terminal can receive the PDCCH in CORESET.

8 illustrates CORESET.

Referring to FIG. 8, CORESET may be composed of N ^CORESET _RB resource blocks in the frequency domain, and 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 an upper layer signal. As shown in FIG. 8, a plurality of CCEs (or REGs) may be included in the CORESET.

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

The terminal can receive a plurality of CORESET settings.

Referring to FIG. 9, a control area 300 in a conventional wireless communication system (eg, LTE/LTE-A) is configured over the entire system band used by the base station. Except for some terminals that support only a narrow band (e.g., eMTC/NB-IoT terminals), all terminals must receive radio signals of the entire system band of the base station in order to properly receive/decode control information transmitted by the base station. Should have been.

On the other hand, in NR, the above-described CORESET was introduced. CORESET (301, 302, 303) can be said to be a radio resource for control information that the terminal should receive, and can use only a part of the system band instead of the entire system. The base station can allocate a CORESET to each terminal, and can transmit control information through the allocated CORESET. For example, in FIG. 9, the first CORESET 301 may be allocated to the terminal 1, the second CORESET 302 may be allocated to the second terminal, and the third CORESET 303 may be allocated to the terminal 3. The terminal in the NR can receive the control information of the base station even if the entire system band is not necessarily received.

In the CORESET, there may be a terminal-specific CORESET for transmitting terminal-specific control information and a common CORESET for transmitting common control information 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 BLER (block error rate) for) 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 contents included in the DCI may be reduced, and/or the amount of resources used for 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 spatial domain.

Meanwhile, the following technologies/features may be applied in NR.

<Self-contained subframe structure>

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

In NR, a structure in which a control channel and a data channel are time division multiplexed (TDM) within one TTI is considered as one of the frame structures as shown in FIG. 10 for the purpose of minimizing latency. Can be.

In FIG. 10, a shaded area indicates a downlink control area, and a black area indicates an uplink control area. An area without indication may be used for downlink data (DL data) transmission or for uplink data (UL data) transmission. The characteristic of this structure is that downlink (DL) transmission and uplink (UL) transmission are sequentially performed within one subframe, and DL data is transmitted within a subframe, and UL ACK/ Acknowledgment/Not-acknowledgement (NACK) can also be received. As a result, it is possible to reduce the time taken to retransmit data when a data transmission error occurs, thereby minimizing the latency of the final data transmission.

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

11 is an example of a self-contained slot structure.

Referring to FIG. 11, one slot may have a self-contained structure in which all of a DL control channel, DL or UL data, and a UL control channel may be included. For example, the first N symbols in a slot may be used to transmit a DL control channel (hereinafter, a DL control region), and the last M symbols in a slot may be used to transmit a UL control channel (hereinafter, a UL control region). N and M are each an integer of 0 or more. A resource region (hereinafter, a data region) between the DL control region and the UL control region may be used for DL data transmission or UL data transmission. As an example, the following configuration may be considered. Each section was listed in chronological order.

1.DL only configuration

2. UL only configuration

3. Mixed UL-DL configuration

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

-DL control area + GP + UL area

Here, the DL area may be (i) a DL data area, (ii) a DL control area + DL data area. The UL region may be (i) a UL data region, (ii) a UL data region + a UL control region.

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

In the millimeter wave (mmW), the wavelength is shortened, making it possible to install multiple antenna elements in the same area. That is, in the 30GHz band, the wavelength is 1cm, and a total of 100 antenna elements can be installed in a two-dimensional arrangement at 0.5 wavelength intervals on a 5 by 5 cm panel. Therefore, in mmW, a plurality of antenna elements are used to increase beamforming (BF) gain to increase coverage or to 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 is possible for each frequency resource. However, to install TXRUs on all of the 100 antenna elements, there is a problem that the effectiveness is inferior in terms of price. Therefore, a method of mapping a plurality of antenna elements to one TXRU and adjusting the direction of a beam using an analog phase shifter is considered. This analog beamforming method has a disadvantage in that it is not possible to perform frequency selective beamforming because only one beam direction can be created in the entire band.

Hybrid beamforming (hybrid BF) having B TXRUs, which is a smaller number than Q antenna elements, may be considered as an intermediate form between digital beamforming (digital BF) and analog beamforming (analog BF). In this case, although there is a difference according to the connection method of the B TXRUs and Q antenna elements, the directions of beams that can be transmitted at the same time are limited to B or less.

In an NR system, when multiple antennas are used, a hybrid beamforming technique that combines digital beamforming and analog beamforming has emerged. At this time, analog beamforming (or RF beamforming) performs precoding (or combining) at the RF stage, and thus the number of RF chains and the number of D/A (or A/D) converters There is an advantage in that it can achieve a performance close to that of digital beamforming while reducing the value. 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 can be expressed as an N by L matrix, and the converted N digital signals are then converted to analog signals through TXRU. After conversion, analog beamforming expressed as an M by N matrix is applied.

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

In FIG. 12, the number of digital beams is L, and the number of analog beams is N. Furthermore, in the NR system, the base station is designed so that the analog beamforming can be changed in units of symbols, and a direction of supporting more efficient beamforming to a terminal located in a specific area is considered. Furthermore, when defining specific N TXRUs and M RF antennas as one antenna panel in FIG. 12, the NR system considers a method of introducing a plurality of antenna panels to which independent hybrid beamforming can be applied. Has become.

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

13 shows a synchronization signal and a PBCH (SS/PBCH) block.

According to FIG. 13, the SS/PBCH block spans PSS and SSS occupying 1 symbol and 127 subcarriers, respectively, and 3 OFDM symbols and 240 subcarriers, but an unused portion for SSS is in the middle on one symbol. It consists of the remaining PBCH. The periodicity of the SS/PBCH block may be set by the network, and the time position at which the SS/PBCH block may be transmitted may be determined by subcarrier spacing.

Polar coding may be used for the PBCH. The UE may assume a band-specific subcarrier spacing for the SS/PBCH block unless the network configures the UE to assume a different subcarrier spacing.

PBCH symbols carry their own frequency-multiplexed DMRS. QPSK modulation can be used for PBCH. 1008 unique physical layer cell IDs may be given.

For a half frame having SS/PBCH blocks, first symbol indices for candidate SS/PBCH blocks are determined according to subcarrier spacing of SS/PBCH blocks to be described later.

-Case A-Subcarrier spacing 15 kHz: The first symbols of candidate SS/PBCH blocks have an index of {2, 8}+14*n. For a carrier frequency of 3 GHz or less, n = 0, 1. For carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, and 3.

-Case B-Subcarrier spacing 30 kHz: The first symbols of candidate SS/PBCH blocks have an index of {4, 8, 16, 20} + 28*n. For a carrier frequency of 3 GHz or less, n=0. For a carrier frequency of more than 3 GHz and less than 6 GHz, n = 0, 1.

-Case C-Subcarrier spacing 30kHz: The first symbols of candidate SS/PBCH blocks have an index of {2, 8}+14*n. For a carrier frequency of 3 GHz or less, n = 0, 1. For carrier frequencies above 3 GHz and below 6 GHz, n = 0, 1, 2, and 3.

-Case D-Subcarrier spacing 120kHz: The first symbols of candidate SS/PBCH blocks have an index of {4, 8, 16, 20} + 28*n. For carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.

-Case E-Subcarrier spacing 240 kHz: The first symbols of candidate SS/PBCH blocks have an index of {8, 12, 16, 20, 32, 36, 40, 44} + 56*n. For carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8.

Candidate SS/PBCH blocks in the half frame are indexed in ascending order from 0 to L-1 on the time axis. The UE should determine 2 LSB bits for L=4 and 3 LSB bits for L>4 of the SS/PBCH block index per half frame from the one-to-one mapping with the index of the DM-RS sequence transmitted in the PBCH. do. For L=64, the UE must determine 3 MSB bits of the SS/PBCH block index per half frame by PBCH payload bits.

By the higher layer parameter'SSB-transmitted-SIB1', the index of SS/PBCH blocks in which the UE cannot receive other signals or channels in the REs overlapping with the REs corresponding to the SS/PBCH blocks is set Can be. In addition, by the higher layer parameter'SSB-transmitted', the index of SS/PBCH blocks per serving cell in which the UE cannot receive other signals or channels in the REs overlapping with the SS/PBCH blocks and corresponding REs is Can be set. The configuration by'SSB-transmitted' may take precedence over the configuration by'SSB-transmitted-SIB1'. The periodicity of a half frame for reception of SS/PBCH blocks per serving cell may be set by the higher layer parameter'SSB-periodicityServingCell'. If the terminal does not set the periodicity of the half frame for reception of SS/PBCH blocks, the terminal must assume the periodicity of the half frame. The UE may assume that the periodicity is the same for all SS/PBCH blocks in the serving cell.

14 is for explaining a method for a terminal to obtain timing information.

First, the UE can obtain 6-bit SFN information through a Master Information Block (MIB) received in the PBCH. In addition, it is possible to obtain 4 SFN bits in the PBCH transport block.

Second, the UE can obtain a 1-bit half frame indicator as part of the PBCH payload. In less than 3GHz, the half frame indicator may be implicitly signaled as part of the PBCH DMRS for Lmax=4.

Finally, the UE can obtain the SS/PBCH block index by the DMRS sequence and the PBCH payload. That is, the LSB 3 bits of the SS block index can be obtained by the DMRS sequence for a 5 ms period. In addition, the MSB 3 bits of timing information are explicitly carried in the PBCH payload (for more than 6 GHz).

In initial cell selection, the UE may assume that a half frame having SS/PBCH blocks is generated with a periodicity of 2 frames. If it detects the SS / PBCH block, the terminal, and if the k for the FR1 and _SSB ≤23 ≤11 _SSB and k for FR2, Type0-PDCCH common search space (common search space) is determined that the present controlled set of resources for do. If k _SSB >23 for FR1 and k _SSB >11 for FR2, the UE determines that there is no control resource set for the Type0-PDCCH common search space.

For a serving cell without transmission of SS/PBCH blocks, the UE acquires time and frequency synchronization of the serving cell based on reception of SS/PBCH blocks on the primary cell or PSCell of the cell group for the serving cell.

In the following, system information acquisition will be described.

System information (SI) is divided into a MasterInformationBlock (MIB) and a plurality of SystemInformationBlocks (SIBs). here,

-MIB has a period of 80ms and is always transmitted on the BCH and is repeated within 80ms, and includes parameters necessary to obtain SystemInformationBlockType1 (SIB1) from the cell;

-SIB1 is transmitted with periodicity and repetition on the DL-SCH. SIB1 contains information on availability and scheduling (eg, periodicity, SI-window size) of other SIBs. In addition, it indicates whether these (ie, other SIBs) are provided on a periodic broadcast basis or on demand. If other SIBs are provided by request, SIB1 includes information for the UE to perform the SI request;

-SIBs other than SIB1 are carried in a SystemInformation (SI) message transmitted on the DL-SCH. Each SI message is transmitted within a time domain window (referred to as an SI-window) that occurs periodically;

-For PSCell and secondary cells, the RAN provides the necessary SI by dedicated signaling. Nevertheless, the UE must acquire the MIB of the PSCell in order to obtain the SFN timing (which may be different from the MCG) of the SCH. When the related SI for the secondary cell is changed, the RAN releases and adds the related secondary cell. For PSCell, SI can be changed only by reconfiguration with sync.

15 shows an example of a process of obtaining system information of a terminal.

According to FIG. 15, the UE may receive an MIB from a network and then receive SIB1. Thereafter, the terminal may transmit a system information request to the network, and may receive a'SystemInformation message' from the network in response thereto.

The terminal may apply a system information acquisition procedure for acquiring access stratum (AS) and non-access stratum (NAS) information.

A terminal in the RRC_IDLE and RRC_INACTIVE states must ensure (at least) a valid version of MIB, SIB1, and SystemInformationBlockTypeX (according to the RAT support for mobility controlled by the terminal).

The UE in the RRC_CONNECTED state must ensure valid versions of MIB, SIB1, and SystemInformationBlockTypeX (according to mobility support for the related RAT).

The UE must store the related SI obtained from the currently camped/serving cell. The version of the SI acquired and stored by the terminal is valid only for a certain period of time. The UE may use the stored version of the SI after, for example, cell reselection, return from outside coverage, or system information change instruction.

Hereinafter, random access will be described.

The random access procedure of the terminal can be summarized as shown in Table 5 below.

16 is for explaining a random access procedure.

Referring to FIG. 16, first, the UE may transmit a physical random access channel (PRACH) preamble through uplink as message (Msg) 1 of the random access procedure.

Two random access preamble sequences having different lengths are supported. A long sequence of length 839 is applied to subcarrier spacing of 1.25 kHz and 5 kHz, and a short sequence of length 139 is applied to subcarrier spacing of 15, 30, 60, and 120 kHz. The long sequence supports an inrestricted set and a limited set of types A and B, while the short sequence supports only an unrestricted set.

A plurality of RACH preamble formats are defined by one or more RACH OFDM symbols, a different cyclic prefix (CP), and a guard time. The PRACH preamble setting to be used is provided to the terminal as system information.

If there is no response to Msg1, the UE may retransmit the power ramped PRACH preamble within a prescribed number of times. The UE calculates the PRACH transmission power for retransmission of the preamble based on the most recent estimated path loss and power ramping counter. If the terminal performs beam switching, the power ramping counter does not change.

17 is for explaining a power ramping carwonter.

The UE may perform power ramping for retransmission of the random access preamble based on the power ramping counter. Here, as described above, the power ramping counter does not change when the terminal performs beam switching during PRACH retransmission.

According to FIG. 17, when the terminal retransmits the random access preamble for the same beam, such as when the power ramping counter increases from 1 to 2 and from 3 to 4, the terminal increases the power ramping counter by one. However, when the beam is changed, the power ramping counter does not change during PRACH retransmission.

The system information informs the UE of the relationship between SS blocks and RACH resources. The threshold of the SS block for the RACH resource relationship is based on RSRP and network configuration. Transmission or retransmission of the RACH preamble is based on an SS block that satisfies the threshold. Accordingly, in the example of FIG. 18, since the SS block m exceeds the threshold of the received power, the RACH preamble is transmitted or retransmitted based on the SS block m.

Thereafter, when the UE receives a random access response on the DL-SCH, the DL-SCH may provide timing arrangement information, RA-preamble ID, initial uplink grant, and temporary C-RNTI.

Based on the information, the UE may perform uplink transmission on the UL-SCH as Msg3 of the random access procedure. Msg3 may include an RRC connection request and a UE identifier.

In response to this, the network may transmit Msg4, which may be treated as a contention cancellation message, in downlink. By receiving this, the terminal can enter the RRC connected state.

In the NR system, up to 400 megahertz (MHz) per component carrier (CC) may be supported. If a terminal operating in such a wideband CC always operates with the RF for the entire CC turned on, the terminal battery consumption may increase. Or, when considering several use cases (e.g., eMBB, URLLC, mMTC, etc.) operating within one broadband CC, different numerology for each frequency band within the CC (e.g., subcarrier spacing (sub -carrier spacing: SCS)) may be supported. Alternatively, each terminal may have different capabilities for the maximum bandwidth. In consideration of this, the base station may instruct the terminal to operate only in a portion of the bandwidth rather than the entire bandwidth of the broadband CC, and for convenience, a bandwidth part (BWP) is intended to be defined. The BWP can be composed of consecutive resource blocks (RBs) on the frequency axis, and one neurology (e.g., subcarrier spacing, cyclic prefix (CP) length, slot/mini-slot) May correspond to a duration, etc.).

Meanwhile, the base station may set multiple BWPs even within one CC set for the terminal. For example, in a PDCCH monitoring slot, a BWP occupying a relatively small frequency domain may be set, and a PDSCH indicated by the PDCCH may be scheduled on a larger BWP. Alternatively, when the terminals are concentrated in a specific BWP, some terminals may be set to different BWPs for load balancing. Alternatively, in consideration of frequency domain inter-cell interference cancellation between neighboring cells, some spectrum of the entire bandwidth may be excluded and both BWPs may be set within the same slot. That is, the base station may set at least one DL/UL BWP to a terminal associated with a wideband CC, and at least one DL/UL BWP among the DL/UL BWP(s) set at a specific time point. It can be activated (by L1 signaling or MAC CE or RRC signaling, etc.), and switching to another set DL/UL BWP can be indicated (by L1 signaling or MAC CE or RRC signaling), or a timer based on a timer When the value expires, it may be switched to a predetermined DL/UL BWP. In this case, the activated DL/UL BWP is defined as an active DL/UL BWP. However, in situations such as when the terminal is in the process of initial access or before the RRC connection is set up, the configuration for the DL/UL BWP may not be received. The /UL BWP is defined as an initial active DL/UL BWP.

<DRX(Discontinuous Reception)>

Discontinuous Reception (DRX) refers to an operation mode in which a user equipment (UE) reduces battery consumption so that the UE can receive a downlink channel discontinuously. That is, the terminal configured as DRX can reduce power consumption by discontinuously receiving the DL signal.

The DRX operation is performed within a DRX cycle indicating a time interval in which an On Duration is periodically repeated. The DRX cycle includes an on-period and a sleep duration (or DRX opportunity). The on-period represents a time interval during which the UE monitors the PDCCH to receive the PDCCH.

DRX may be performed in a Radio Resource Control (RRC)_IDLE state (or mode), an RRC_INACTIVE state (or mode), or an RRC_CONNECTED state (or mode). In the RRC_IDLE state and the RRC_INACTIVE state, the DRX can be used to receive paging signals discontinuously.

-RRC_IDLE state: a state in which a radio connection (RRC connection) between the base station and the terminal is not established.

-RRC_INACTIVE state: A radio connection (RRC connection) is established between the base station and the terminal, but the radio connection is inactive.

-RRC_CONNECTED state: a state in which a radio connection (RRC connection) is established between the base station and the terminal.

DRX can be basically classified into an idle mode DRX, a connected DRX (C-DRX), and an extended DRX.

DRX applied in the IDLE state may be referred to as an idle mode DRX, and DRX applied in the CONNECTED state may be referred to as a connected mode DRX (C-DRX).

eDRX (Extended/Enhanced DRX) is a mechanism that can extend the cycle of idle mode DRX and C-DRX, and eDRX (Extended/Enhanced DRX) can be mainly used for (massive) IoT application. In the idle mode DRX, whether to allow eDRX may be set based on system information (eg, SIB1). SIB1 may include an eDRX-allowed parameter. The eDRX-allowed parameter is a parameter indicating whether idle mode extended DRX is allowed.

In the idle mode, the terminal can use DRX to reduce power consumption. One paging occasion (PO) is a P-RNTI (Paging-Radio Network Temporary Identifier) (PDCCH (addressing) a paging message for the NB-IoT) or MPDCCH (MTC PDCCH). ) Or Narrowband PDCCH (NPDCCH).

In P-RNTI transmitted through MPDCCH, PO may indicate the start subframe of MPDCCH repetition. In the case of 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 effective 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 through which the UE receives a paging message. PF, PO and PNB may be determined based on DRX parameters provided in system information.

Referring to FIG. 19, the terminal may receive idle mode DRX configuration information from the base station through higher layer signaling (eg, system information) (S21).

The terminal may determine a paging frame (PF) and a paging occasion (PO) to monitor the PDCCH in a paging DRX cycle based on the idle mode DRX configuration information (S22). In this case, the DRX cycle may include on- and sleep (or DRX opportunities).

The terminal may monitor the PDCCH in the PO of the determined PF (S23). 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 during the on-period (ie, paging is detected), the terminal transitions to the connected mode and can transmit and receive data with the base station.

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, the short DRX cycle may correspond to an option.

When C-DRX is configured, the UE may perform PDCCH monitoring for the on-section. If the PDCCH is successfully detected during PDCCH monitoring, the UE may operate (or execute) 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-section is ended.

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

Meanwhile, PDCCH monitoring may be limited to a time interval set as a measurement gap regardless of the C-DRX setting.

20 illustrates the DRX cycle.

Referring to FIG. 20, the DRX cycle consists of'On Duration' and'Opportunity for DRX (opportunity for DRX)'. The DRX cycle defines the time interval at which the'on-interval' repeats periodically. The'on-interval' represents a time period during which the UE monitors to receive the PDCCH. When DRX is configured, the UE performs PDCCH monitoring during the'on-period'. If there is a PDCCH successfully detected during PDCCH monitoring, the UE operates an inactivity timer and maintains an awake state. On the other hand, if there is no PDCCH successfully detected during PDCCH monitoring, the terminal enters a sleep state after the'on-section' ends. Accordingly, when DRX is configured, PDCCH monitoring/reception may be discontinuously performed in the time domain in performing the procedure and/or method described/proposed above. For example, when DRX is set, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) in the present disclosure may be set discontinuously according to the DRX configuration. On the other hand, when DRX is not set, PDCCH monitoring/reception may be continuously performed in the time domain in performing the procedures and/or methods described/proposed above. For example, when DRX is not set, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously set in the present disclosure. Meanwhile, regardless of whether or not DRX is set, PDCCH monitoring may be restricted in a time period set as a measurement gap.

Table 6 shows the process of the terminal related to the DRX (RRC_CONNECTED state). Referring to Table 6, DRX configuration information is received through higher layer (eg, RRC) signaling, and whether DRX ON/OFF is controlled by a DRX command of the MAC layer. When DRX is set, PDCCH monitoring may be discontinuously performed in performing the procedure and/or method described/suggested in the present disclosure.

	신호의 종류(Type of signals)Type of signals	단말 절차(UE procedure) UE procedure

단계 1Step 1	RRC 시그널링(MAC-CellGroupConfig)RRC signaling (MAC-CellGroupConfig)	- DRX 설정 정보 수신-Receive DRX configuration information

단계 2Step 2	MAC CE((긴(Long)) DRX 명령(command) MAC CE)MAC CE ((Long) DRX command MAC CE)	- DRX 명령 수신-Receive DRX command
단계 3Step 3	--	- DRX 주기의 온-듀레이션(on-duration) 동안 PDCCH 모니터링-PDCCH monitoring during on-duration of DRX cycle

The MAC-CellGroupConfig may include configuration information required to set a medium access control (MAC) parameter for a cell group. MAC-CellGroupConfig may also include configuration information about DRX. For example, MAC-CellGroupConfig defines DRX, and may include information as follows.

-Value of drx-OnDurationTimer: Defines the length of the start section of the DRX cycle

-Value of drx-InactivityTimer: Defines the length of the time interval in which the UE is awake after the PDCCH opportunity in which the PDCCH indicating initial UL or DL data is detected

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

-Value of drx-HARQ-RTT-TimerDL: After the grant for initial UL transmission is received, the length of the maximum time interval until the grant for UL retransmission is received is defined.

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

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

Here, if any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, drx-HARQ-RTT-TimerDL is in operation, the UE performs PDCCH monitoring at every PDCCH opportunity while maintaining the awake state.

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

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 related to technical performance for the IMT-2020 air interface, the energy efficiency of a device can be related to support for two aspects: a) Efficient data in the case of load. Transmission, b) low energy consumption when there is no data. Efficient data transmission in the loaded case is demonstrated by average spectral efficiency. In the absence of data, low energy consumption can be estimated by the slip ratio.

Since the NR system can support high-speed data transmission, it is expected that user data tends to burst and serve for a very short period of time. One efficient terminal power saving mechanism is to trigger the terminal for network access from the power efficiency mode. Unless there is 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, when there is no traffic to transmit, the network can support the terminal to switch from the network access mode to the power saving mode (eg, dynamic terminal switching to sleep with a network support signal).

In addition to minimizing power consumption with a new wake-up/go-to-sleep mechanism, it is equally important to reduce power consumption during network access 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 main factors of power consumption during network access, including processing of aggregated bandwidth, dynamic number of RF chains and dynamic transmission/reception time and dynamic switching to power efficiency mode. In most cases of LTE field TTI, since there is no or little data, a power saving scheme for dynamic adaptation to other data arrivals should be studied in RRC-CONNECTED mode. Dynamic adaptation to traffic of various dimensions such as carrier, antenna, beamforming and bandwidth can also be studied. Furthermore, it is necessary to consider how to enhance the switching between network access mode and power saving mode. Both network-assisted and terminal-assisted approaches should be considered for terminal power saving mechanisms.

The terminal also consumes a lot of power for RRM measurement. In particular, the terminal must turn on the power before the DRX ON period for tracking the channel to prepare for RRM measurement. Some of the RRM measurement is not essential, but consumes a lot of terminal power. For example, low mobility terminals do not need to be measured as frequently as high mobility terminals. The network may provide signaling to reduce power consumption for RRM measurement that is unnecessary for the terminal. Additional terminal support, for example terminal state information, etc., is also useful for enabling the network to reduce terminal power consumption for RRM measurement.

Accordingly, there is a need for research to identify the feasibility and advantages of a technology that enables implementation of a terminal capable of operating while reducing power consumption.

Hereinafter, UE power saving schemes will be described.

For example, the terminal power saving techniques are 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 for triggering UE power consumption adaptation, reduction of power consumption in RRM measurement, and the like may be considered.

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

Regarding adaptation to the terminal processing capability, the following techniques may be considered. When requested by the network, the terminal reports its terminal radio access capability, which is at least static. The gNB may request the ability of the UE to report based on band information. If allowed by the network, a temporary capability limit request may be sent by the terminal to signal the limited availability of some capabilities (eg, due to hardware sharing, interference or overheating) to the gNB. Thereafter, the gNB can confirm or reject the request. Temporary capability limitations 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 techniques may be considered. The UE monitors the PDCCH candidate set at a monitoring occasion set in one or more set CORESETs according to a corresponding search space setting. 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 consists of a set of REGs. The control channel is formed by 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 mapping is supported in CORESET.

Regarding the power saving signal/channel/procedure for triggering the 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 a corresponding uplink transmission, and does not need to perform a channel quality indicator (CQI) measurement. Conversely, when one cell is activated, the UE must 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 (a group of SCells associated with PUCCH of PUCCH signaling PUCCH signaling) from being activated while the PUCCH SCell (secondary cell composed of PUCCH) is deactivated. The NG-RAN causes the SCell mapped to the PUCCH SCell to be deactivated before the PUCCH SCell is changed or removed.

When resetting without mobility control information, the SCell added to the set of serving cells is initially deactivated, and the SCells remaining in the set of serving cells (unchanged or reset) do not change the activation state (active or inactive). .

When reconfiguring with mobility control information (eg, handover), SCells are deactivated.

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

For BA, the terminal's reception and transmission bandwidth need not be as wide as the cell's bandwidth and can be adjusted: the width can be commanded to be changed (e.g., a period of low activity to save power During contraction), the location in the frequency domain can be moved (eg, to increase scheduling flexibility), and the subcarrier spacing can be commanded to change (eg, to allow different services). The subset of the total cell bandwidth of the cell is referred to as a bandwidth part (BWP), and the BA is obtained by setting the BWP(s) to the UE and notifying the UE that it is currently active among the set BWPs. When the BA is set, the terminal 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. The BWP inactive timer (independent of the DRX inactive timer described above) is used to switch the active BWP to the default BWP: the timer restarts when the PDCCH decoding succeeds, and when the timer expires, switching to the default BWP occurs. do.

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

21 shows an example in which BWP ₁ , BWP ₂ and BWP ₃ are set on time-frequency resources. BWP ₁ has a width of 40 MHz and a subcarrier spacing of 15 kHz, BWP ₂ has 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 different widths and/or different subcarrier spacings.

Regarding the reduction of power consumption in RRM measurement, the following technique may be considered. When two measurement types are possible, the RRM configuration includes beam measurement information (for layer 3 mobility) related to SSB(s) and CSI-RS(s) for reported cell(s). can do. In addition, when CA is configured, RRM configuration may include a list of best cells on each frequency for which measurement information is available. Also, the RRM measurement information may include beam measurement for listed cells belonging to the target gNB.

Hereinafter, the proposal of the present disclosure will be described in more detail.

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

In the present specification, a method of changing a control channel setting in consideration of power saving of a terminal in a wireless communication system is proposed. That is, according to the present specification, the network can instruct the terminal to change the CORESET/search space set setting and/or the parameter value related to the setting in order to save power of the terminal, and the terminal can change the CORESET / By receiving the PDCCH based on the search space set setting, power reduction can be achieved.

Here, the change of the CORESET/search space set setting set for the terminal may be one of a power saving scheme or an operation related to a power saving mode of the terminal. Furthermore, when the network instructs the terminal to perform a specific power saving scheme, the terminal may perform an operation related to the specific power saving scheme and change the CORESET/search space set setting set for the terminal.

Hereinafter, the PDCCH configuration for power saving will be described.

As described above, hereinafter, it is proposed to change the settings of the CORESET and the search space set in order to save power of the terminal and increase the PDCCH reception performance. CORESET and search set settings can be selected/changed in the following way.

(Option 1) Multiple CORESET/Search Space Set Settings

The network may instruct setting of a plurality of CORESET/search space sets applicable to the terminal. Alternatively, the normal mode dedicated CORESET/search space set setting and the power saving mode dedicated CORESET/search space set setting may be indicated, respectively. The terminal may perform a reception operation for a control channel by applying the associated CORESET/search space set setting according to a network instruction or a power level to be applied by the terminal. At this time, since a plurality of CORESET/search space set settings set for each mode cannot be applied together in the same slot, the number of CORESET/search space sets for each BWP may be counted as 1. For example, if there are 3 CORESET settings dedicated to normal mode, 10 search space sets, 2 CORESET settings dedicated to power saving mode, and 5 search space sets, depending on the mode currently applied, the CORESET/ The number of search space set settings may be assumed to be 3/10 or 2/5. In addition, even if multiple CORESET/search space sets are defined, only one CORESET identifier (ID) and search space set ID may be set. That is, a plurality of settings may be indicated for one CORESET ID or a search space set ID, and an actual applied setting may be determined according to whether or not a power saving technique is applied. This may mean that certain CORESET IDs may be assigned only to certain modes. For example, CORESET#2 may indicate only the general mode only setting without the power saving mode only setting. This may mean that different settings are indicated for a specific CORESET/search space set depending on whether or not the power saving technique is applied.

Meanwhile, the following table is an example of control resource setting information.

Each parameter included in the control resource setting information may be as shown in the following table.

ControlResourceSetControlResourceSet field descriptionsfield descriptions

cce- REG - MappingType : Mapping of Control Channel Elements (CCE) to Resource Element Groups (REG))

controlResourceSetId: A value of 0 identifies the common CORESET set in MIB and ServingCellConfigCommon ( controlResourceSetZero ), and thus is not used in IE ControlResourceSet . 1.. The maxNrofControlResourceSets-1 value identifies CORESETs set to dedicated signaling or SIB1. The controlResourceSetId is unique for BWPs of a serving cell. (Value 0 identifies the common CORESET configured in MIB and in ServingCellConfigCommon (controlResourceSetZero) and is hence not used here in the ControlResourceSet IE. Values 1 .. maxNrofControlResourceSets-1 identify CORESETs configured by dedicated signalling or in SIB1. The controlResourceSetId is unique among the BWPs of a serving cell.)

Duration: Contiguous time duration of the CORESET in number of symbols

frequencyDomainResources : Frequency domain resources for CORESET. Each bit corresponds to a set of 6RBs, and the group starts with the first RB group of the BWP. The first (leftmost/most important) bit corresponds to the first RB group in the BWP, and the rule continues. A bit set to 1 indicates that this RB group belongs to the frequency domain resource of this CORESET. The bit corresponding to an RB group that is not completely included in the configured bandwidth part for which CORESET is configured is set to zero. (Frequency domain resources for the CORESET.Each bit corresponds to a group of 6 RBs, with grouping starting from the first RB group in the BWP.The first (left-most / most significant) bit corresponds to the first RB group in the BWP, and so on.A bit that is set to 1 indicates that this RB group belongs to the frequency domain resource of this CORESET.Bits corresponding to a group of RBs not fully contained in the bandwidth part within which the CORESET is configured are set to zero )

interleaverSize : Interleaver-size

pdcch - DMRS - ScramblingID : PDCCH DMRS scrambling initialization. Without this field, the UE applies the value of physCellID set in this serving cell. (PDCCH DMRS scrambling initialization.When the field is absent the UE applies the value of the physCellId configured for this serving cell.)

precoderGranularity : Precoder granularity in frequency domain.

reg - BundleSize : REG can be bundled to create a REG bundle. This parameter defines the size of these bundles. (Resource Element Groups (REGs) can be bundled to create REG bundles.This parameter defines the size of such bundles.)

shiftIndex : If this field is not present, the UE applies the value of physCellId set in this serving cell. (When the field is absent the UE applies the value of the physCellId configured for this serving cell.)

tci - PresentInDCI : When at least spatial QCL is set/instructed, this field indicates whether the TCI field exists in the DL-related DCI. Without this field, the UE considers that there is no TCI or is deactivated. In the case of cross-carrier scheduling, the network configures this field to be possible for the ControlResourceSet used for cross-carrier scheduling in a scheduling cell. (If at least spatial QCL is configured/indicated, this field indicates if TCI field is present or not present in DL-related DCI.When the field is absent the UE considers the TCI to be absent/disabled. In case of cross carrier scheduling. , the network sets this field to enabled for the ControlResourceSet used for cross carrier scheduling in the scheduling cell.)

tci - StatesPDCCH - ToAddList : A subset of TCI states defined in pdsch-Config included in the BWP-DownlinkDedicated corresponding to the DL BWP to which the serving cell and ControlResourceSet belong. It is used to provide a QCL relationship between DL RS(s) and PDCCH DMRS ports in one RS Set (TCI-State). The network configures up to maxNrofTCI-StatesPDCCH entries. (A subset of the TCI states defined in pdsch-Config included in the BWP - DownlinkDedicated corresponding to the serving cell and to the DL BWP to which the ControlResourceSet belong to.They are used for providing QCL relationships between the DL RS(s) in one RS Set (TCI-State) and the PDCCH DMRS ports.The network configures at most maxNrofTCI-StatesPDCCH entries.)

Meanwhile, when the power level to be used by the terminal is changed, the terminal may report it to the network. The network may perform a control channel signal transmission operation based on the changed power level of the terminal.

As another method, IDs are assigned to all CORESET/search space sets, and the CORESET/search space sets that monitor according to the application of power saving techniques are pre-defined rules or higher layer signaling of the network, etc. May be determined by

(Option 2) Set multiple values for each parameter in one CORESET/search space set

Multiple parameters of the set CORESET/search space set may be defined. That is, for each parameter belonging to the CORESET setting and the search space set setting, in addition to the general value, a value for when the power saving technique is applied or when operating in the power saving mode may be additionally indicated. A parameter dedicated to the power saving technique may be added to all or some parameters belonging to the CORESET/search space set setting, and each parameter will be described later. In the normal mode, the terminal performs a control channel reception operation based on the general mode-specific setting of the CORESET/search space set, and in the power saving mode, the CORESET/search space set is set by applying the power saving mode-only value and the control channel reception operation Can be done.

(Option 3) CORESET/skipping search space set

The above-described options relate to a method for applying a CORESET/search space set setting different from the normal mode when a power saving mode or a power saving scheme is applied to a terminal or when a power level to be applied by the terminal is changed.

As another method, CORESET to skip monitoring when a power saving mode or a power saving technique is applied to the terminal or the power level to be applied by the terminal is changed due to predefined rules or higher layer signaling of the network, and/or Alternatively, a set of search spaces may be specified. This may be indicated by a specific CORESET ID/search space set ID, or whether to omit monitoring may be determined by a specific parameter of the CORESET/search space set.

For example, the CORESET setting includes a parameter that determines whether or not interleaving (for example, cce- REG - MappingType ), and the CORESET set to not perform interleaving with the corresponding parameter and a set of search spaces associated with the CORESET For certain modes, monitoring can be omitted. Here, that interleaving is not performed for CORESET may mean that the CORESET is set for the purpose of beamforming gain rather than frequency diversity gain, and when the reception beam pattern changes, etc. Control channel decoding performance in CORESET may decrease.

As another example, when all of the set aggregation level(s) are less than a specific value, monitoring of a corresponding search space set may be omitted in a specific mode (eg, a power saving mode). For example, a set of search spaces in which all of the set aggregation levels are less than 4 cannot compensate for coverage reduction with coding gain, so monitoring can be omitted.

(Option 4) Dynamic parameter change

For the purpose of saving power, the network can dynamically change one or more parameter values in the CORESET setting/search space set setting by using DCI or MAX messages.

The dynamically changed parameter may be defined in advance or may be determined by higher layer signaling of a network. For example, a specific field among DCI may be set to be used for changing a specific parameter according to a predefined or network instruction. For example, the network may indicate one of a plurality of ALs and a candidate set through a specific field in DCI format 1_1/0_1. The terminal receiving the DCI may perform PDCCH reception by applying the corresponding setting after a specific time from the time when the DCI is received. Here, the plurality of ALs and/or candidate sets may be defined in advance or indicated by a network.

Referring to FIG. 22, the network transmits control resource configuration information to the terminal (S2210). Here, the control resource setting information may inform a plurality of settings related to a control resource such as a CORESET/search space set.

Thereafter, the terminal receives the control channel by applying the first control resource setting information according to the first power level (S2220). Here, the first control resource setting information may be included in the control resource setting information.

Thereafter, based on the power level of the terminal being changed to the second power level, the terminal receives a control channel by applying the second control resource setting information according to the second power level (S2230). Here, as an example, the power level of the terminal may be changed to the number of the second reception antennas based on the application of the power saving mode to the terminal. In addition, here, the second control resource setting information may be included in the control resource setting information.

Meanwhile, referring to FIG. 22, a first power level may be a power level related to a normal mode, and a second power level may be a power level related to a power saving mode. That is, step S2220 may be a step in which the terminal operates based on a normal mode, and step S2230 may be a step in which the terminal operates based on a power saving mode.

23 is a flowchart of an example of a network operation for power saving.

Referring to FIG. 23, the network transmits control resource configuration information to the terminal (S2310). Here, the control resource setting information may inform a setting related to a control resource such as a CORESET/search space set for each power level applicable to the terminal.

Then, the network determines the power level applied to the terminal (S2320). Here, as an example, the determination of the power level may be performed based on a power level report or other information received from the terminal.

Thereafter, the network performs control signal processing and transmission according to the power level of the terminal (S2330).

Hereinafter, the CORESET setting for power saving will be described.

Each parameter belonging to the CORESET setting may be determined by a method described later. Here, as an example, the method to be described later may be applied when the power level to be applied by the terminal is changed or when the power saving technique is applied. In addition, here, the CORESET setting may be the same as Table 7 and/or Table 8 described above. The change of the parameter value may be performed by all or part of the suggestions below, and the changed parameter and value may be determined by a predefined rule or by higher layer signaling of the network.

Hereinafter, when the power level to be applied by the terminal is changed or when the power saving technique is applied, a method of changing and changing each parameter is proposed, but the change of each parameter may operate as a power saving technique. For example, the network may change the duration (eg, the size and duration of the CORESET in the time domain) of the specific CORESET(s) for power saving purposes.

-Number of consecutive symbols ( duration )

When the PDCCH coverage decreases due to the power saving technique, more control resources may be required to compensate for this by using a coding rate reduction, etc., which is implemented by increasing the duration of CORESET. It could be. In this case, an offset is defined for each duration to increase a duration by an offset, or an increased duration value may be indicated by using signaling. Alternatively, the duration of CORESET may be reduced as a method of saving power. For example, when switching from the normal mode to the power saving mode is instructed, the terminal performs monitoring for the duration of each CORESET or by converting to a duration defined in advance or indicated by the network for a specific CORESET. May be. Meanwhile, the above-described conversion of the duration time of CORESET may be applied only when there is no coverage reduction problem.

For example, when the CORESET duration set in the normal mode is 2, it may be defined in advance so that 3 is applied in the power saving mode, or may be indicated by the network.

As another example, the duration of the CORESET set to 3 symbols in the normal mode may be defined in advance or indicated by the network to be converted to 1 symbol or 2 symbols in the power saving mode.

-Resource block set ( frequencyDomainResources )

For the same reason as the duration, the CORESET size in the frequency domain may also be increased. In this case, an offset is defined for each frequency domain resource size to increase the frequency domain resource by the offset, or an increased frequency domain resource value may be indicated by using signaling. Conversely, the size of CORESET in the frequency domain may be reduced to increase the power saving gain.

For example, when the frequency domain resource of CORESET set in the normal mode is 60, it may be defined in advance so that 96 is applied in the power saving mode, or may be indicated by the network. Here, units of 60 and 96 may be resource blocks.

-CCE to REG mapping parameter ( cce- REG - MappingType )

The CCE-to-REG mapping parameter determines whether interleaving is applied in the corresponding CORESET, and if interleaving is applied, additional REG bundle size, interleaver (row) size , A shift index, or the like may be set. When the PDCCH coverage decreases due to power saving, the PDCCH detection performance in a CORESET suitably set for a normal mode can be greatly reduced. Accordingly, there is a need for a method of compensating for a coverage decrease due to power saving, and a method of increasing a diversity gain may be considered in the CORESET setting. For example, as a method of increasing diversity gain, interleaving is applied to CCE-to-REG mapping to obtain frequency domain diversity and diversity gain by beam cycling. Can be considered. Alternatively, in the case of a terminal having a good channel condition, resources used for control channel transmission may be arranged adjacent to each other using non-interleaving, and a reception probability may be increased by using beamforming or the like.

In the present specification, in the case of CORESET to which interleaving is not applied in the normal mode, it is proposed that interleaving is applied in the power saving mode, and a parameter related to interleaving may be indicated by a predefined rule or network. In addition, a method of applying interleaving CORESET in the normal mode and non-interleaving in the power saving mode may be used.

In addition, it is possible to change additional parameters for the interleaved CORESET. For example, a method of obtaining diversity by beam cycling by reducing the size of a REG bundle, or increasing a frequency diversity gain by changing an interleaver size may be applied.

-Antenna port QCL (quasi co-location) ( TCI - StatesPDCCH )

When each CORESET is received, information related to the base station side transmission beam used to transmit information in the corresponding CORESET as information for setting the reception beam of the terminal is included in the CORESET setting.

When the reception beam pattern of the terminal can be changed by the power saving technique, it may be desirable to change the transmission configuration indication state (TCI state) of each CORESET.

In the present specification, it is proposed that the TCI state that can be assumed for each CORESET in the power saving mode is determined according to a predefined rule or an instruction of a network.

For example, if a terminal using 4 receiving antennas in the default configuration uses 2 receiving antennas for power saving purposes, the TCI status of the monitoring CORESET will be changed to the most recently linked SSB. I can. Here, the most recently linked SSB may be an SSB linked by RACH procedure or MAC CE signaling.

When determining the TCI state of CORESET, when a plurality of TCI states are set by RRC signaling and a specific TCI state is selected by MAC CE signaling, a TCI state pool dedicated to power saving mode may be separately defined. This may be implemented by separately defining a TCI state pool that is a mother set of RRC signaling, or separately indicating a TCI set exclusively for the general mode and a TCI set exclusively for the power saving mode through RRC signaling. Alternatively, among the TCI sets indicated by RRC signaling, only the TCI linked to the SSB is valid in the power saving mode, and when there is no TCI linked to the SSB, a method of omitting the monitoring for the corresponding CORESET in the power saving mode may be applied.

-Indication of presence or absence of the TCI field for DCI format 1_1 ( TCI - PresentInDCI )

TCI - PresentInDCI plays a role of notifying whether TCI information for the PDSCH is included in the DCI transmitted from the corresponding CORESET. Here, the PDSCH may be scheduled by the DCI.

When the power saving mode is applied not only to the PDCCH but also to the PDSCH, TCI- PresentInDCI may be interpreted as an indication to apply a TCI set for the PDSCH in the power saving mode as well as whether a TCI field exists in the DCI. Alternatively, TCI - PresentInDCI may be used to indicate the PDSCH TCI pool to be assumed in the power saving mode.

-Precoder Granularity

Precoder granularity determines the type of a reference signal (RS) included in the control channel, and indicates either broadband RS (allContiguousRBs) or narrowband RS (sameAsREG-bundle). can do. Here, the wideband RS may mean that the precoder granularity is set as a set of contiguous resource blocks or all contiguous resource blocks. Further, here, the narrowband RS may mean that the precoder granularity is set to the REG bundle size.

Since the wideband RS can increase channel estimation performance compared to the narrowband RS, it may be useful when coverage is small or channel information is insufficient.

In this specification, it is proposed that the precoder granularity in the power saving mode is indicated by a predefined rule or network. For example, when a terminal operating four reception antennas by default operates as two reception antennas for power saving, the CORESET in which the narrow-band RS is set may be changed to a wide-band RS.

Hereinafter, setting of a search space set for power saving will be described.

The following table shows an example of setting a search space set.

Each parameter included in the search space set setting may be as shown in the following table.

SearchSpaceSearchSpace field descriptionsfield descriptions

Common: Configures this search space as common search space (CSS) and DCI formats to monitor.

controlResourceSetId : CORESET applicable to the SearchSpace. A value of 0 identifies the common CORESET#0 set by MIB and ServingCellConfigCommon. The 1..maxNrofControlResourceSets-1 value identifies CORESETs set with system information or dedicated signaling. CORESET with non-zero controlResourceSetID is located in the same BWP as the corresponding SearchSpace. (The CORESET applicable for this SearchSpace.Value 0 identifies the common CORESET#0 configured in MIB and in ServingCellConfigCommon.Values 1..maxNrofControlResourceSets-1 identify CORESETs configured in System Information or by dedicated signaling.The CORESETs with non-zero controlResourceSetId locate in the same BWP as this SearchSpace.)

dummy1 , dummy2 : This field is not used in the standard. If received, it is ignored by the terminal. (This field is not used in the specification.If received it shall be ignored by the UE.)

dci - Format0 -0- AndFormat1 -0: If set, the terminal monitors DCI formats 0_0 and 1_0. (If configured, the UE monitors the DCI formats 0_0 and 1_0)

dci - Format2 -0: If set, the terminal monitors DCI format 2_0. (If configured, UE monitors the DCI format 2_0)

dci - Format2 -1: If set, the terminal monitors DCI format 2_1. (If configured, UE monitors the DCI format 2_1)

dci - Format2 -2: If set, the terminal monitors DCI format 2_2. (If configured, UE monitors the DCI format 2_2)

dci - Format2 -3: If set, the terminal monitors DCI format 2_3. (If configured, UE monitors the DCI format 2_3)

dci -Formats: Indicates whether the UE monitors in this USS for DCI formats 0_0 and 1_0 or for formats 0_1 and whether the UE monitors DCI formats 0_0 and 1_0 or formats 0_1 and 1_1 in the corresponding UE-specific search space 1_1.)

Duration: The number of consecutive slots for which the SearchSpace lasts at every opportunity, that is, every cycle given by periodicityAndOffset. If this field is not present, the UE applies 1 slot excluding DCI format 2_0. The UE ignores this field for DCI format 2_0. The maximum valid duration is periodicity-1 (periodicity is given by monitoringSlotPeriodicityAndOffset). (Number of consecutive slots that a SearchSpace lasts in every occasion, ie, upon every period as given in the periodicityAndOffset.If the field is absent, the UE applies the value 1 slot, except for DCI format 2_0.The UE ignores this field for DCI format 2_0.The maximum valid duration is periodicity-1 (periodicity as given in the monitoringSlotPeriodicityAndOffset).)

monitoringSlotPeriodicityAndOffset: Slots for PDCCH monitoring set as period and offset. When the terminal is configured to monitor DCI format 2_1, only sl1, sl2 or sl4 is applicable. When the terminal is configured to monitor DCI format 2_0, sl1, sl2, sl4, sl5, sl8, sl10, sl 16 and sl20 are applicable. (Slots for PDCCH Monitoring configured as periodicity and offset.If the UE is configured to monitor DCI format 2_1, only the values'sl1','sl2'or'sl4' are applicable.If the UE is configured to monitor DCI format 2_0, only the values ′sl1′, ′sl2′, ′sl4′, ′sl5′, ′sl8′, ′sl10′, ′sl16′, and ′sl20′ are applicable)

monitoringSymbolsWithinSlot : First symbol(s) for PDCCH monitoring in slots configured for PDCCH monitoring. MSB is represented by the first OFDM symbol in the slot, the next MSB is represented by the second OFDM symbol in the slot, and the like. The bit set to 1 identifies the first OFDM symbol of CORESET in the slot. If the CP of the BWP is an extended CP, the last two bits in the bit stream are ignored by the terminal. For DCI format 2_0, when the duration of CORESET (in IE ControlResourceSet ) identified by controlResourceSetId indicates 3 symbols, the first one symbol is applied, and (IE ControlResourceSet identified by controlResourceSetId ) My) If the duration of CORESET indicates 2 symbols, the first two symbols are applied and identified by controlResourceSetId (IE ControlResourceSet My) If the duration of CORESET indicates 1 symbol, the first three symbols are applied. (The first symbol(s) for PDCCH monitoring in the slots configured for PDCCH monitoring (see monitoringSlotPeriodicityAndOffset and duration ).The most significant (left) bit represents the first OFDM in a slot, and the second most significant (left) bit represents the second OFDM symbol in a slot and so on.The bit(s) set to one identify the first OFDM symbol(s) of the control resource set within a slot.If the cyclic prefix of the BWP is set to extended CP, the last two bits within the bit string shall be ignored by the UE.For DCI format 2_0, the first one symbol applies if the duration of CORESET (in the IE ControlResourceSet ) identified by controlResourceSetId indicates 3 symbols, the first two symbols apply if the duration of CORESET identified by controlResourceSetId indicates 2 symbols, and the first three symbols apply if the duration of CORESET identified by controlResourceSetId indicates 1 symbol.)

nrofCandidates - SFI : The number of PDCCH candidates for format 2_0 for the set aggregation level. If there is no aggregation level, the terminal does not search for a candidate having the corresponding aggregation level. The network sets one aggregationLevel and the corresponding number of candidates. (The number of PDCCH candidates specifically for format 2_0 for the configured aggregation level.If an aggregation level is absent, the UE does not search for any candidates with that aggregation level.The network configures only one aggregationLevel and the corresponding number of candidates)

nrofCandidates : The number of PDCCH candidates per aggregation level. The number of candidates and aggregation levels set here is applied to all formats unless a specific value is specified or a format-specific value is provided. If a cross-carrier-scheduled cell is configured in SearchSpace, this field determines the number of candidates and aggregation levels to be used in the linked scheduling cell. (Number of PDCCH candidates per aggregation level.The number of candidates and aggregation levels configured here applies to all formats unless a particular value is specified or a format-specific value is provided (see inside searchSpaceType).If configured in the SearchSpace of a cross carrier scheduled cell, this field determines the number of candidates and aggregation levels to be used on the linked scheduling cell)

searchSpaceId : The identifier of the search space. If searchSpaceId is 0, searchSpaceZero set through PBCH (MIB) or ServingCellConfigCommon is identified, so it may not be used in SearchSpace IE. The searchSpaceID is unique among BWPs of a serving cell. In the case of cross-carrier scheduling, search spaces having the same searchSpaceId are connected to each other in a scheduled cell and a scheduling cell. The UE applies the search space to the scheduled cell only when all of the DL BWLs in which the scheduling cell and the search spaces connected in the scheduled cell are configured are activated. (Identity of the search space.SearchSpaceId = 0 identifies the searchSpaceZero configured via PBCH (MIB) or ServingCellConfigCommon and may hence not be used in the SearchSpace IE.The searchSpaceId is unique among the BWPs of a Serving Cell. In case of cross carrier scheduling , search spaces with the same searchSpaceId in scheduled cell and scheduling cell are linked to each other.The UE applies the search space for the scheduled cell only if the DL BWPs in which the linked search spaces are configured in scheduling cell and scheduled cell are both active.)

searchSpaceType : Indicates whether this is a common search space (present) or a UE specific search space as well as DCI formats to monitor for.

ue -Specific: Set the search space as a device-specific search space. The terminal monitors the DCI format with CRC scrambled by C-RNTI, CS-RNTI (when set), and SP-CSI-RNTI (when set). (Configures this search space as UE specific search space (USS).The UE monitors the DCI format with CRC scrambled by C-RNTI, CS-RNTI (if configured), and SP-CSI-RNTI (if configured))

Each parameter belonging to the search space set setting may be determined by a method described later. Here, as an example, the method described later may be applied when a power saving technique is applied or when a power level to be applied by the terminal is changed. The change of the parameter value may be performed by all or part of the suggestions below, and the changed parameter and value may be determined by a predefined rule or by higher layer signaling of the network.

Hereinafter, when the power saving technique is applied, a method of changing and changing each parameter is proposed, but the change of each parameter may operate as a power saving technique. For example, the network can change the association between CORESET and a set of search spaces for power saving purposes.

-Association between CORESET and search space set ( controlResourceSetId )

Each search space set may be associated with one CORESET, and in the search space set setting, a CORESET ID associated with the search space set may be indicated.

When the power saving technique is applied, the associated CORESET for each search space set may be changed, which may be defined in advance or indicated by the network.

For example, when 4 reception antennas are changed to 2 reception antennas for power saving, when the power level to be applied by the terminal is changed, or when the normal mode is converted to a power saving mode, interleaving ( A set of search spaces associated with CORESET that does not use interleaving) can be associated with a CORESET that uses interleaving. Similarly, the set of search spaces associated with CORESET using narrow-band RS can be linked to CORESET using wide-band RS when power saving techniques are applied.

-Monitoring occasion related information ( monitoringSlotPeriodicityAndOffset, monitoringSymbolsWithinSlot , duration )

When the power saving technique is applied, the setting for the monitoring opportunity may be changed, which may be defined in advance or indicated by the network.

For example, when the power saving technique is applied, the period may be increased or decreased compared to the monitoring periodicity in the normal mode, or the frequency of monitoring occasions within the slot may be increased or decreased. have.

-Aggregation level (AL) and number of candidates

When a power saving technique is applied or when a power saving technique that causes coverage reduction is applied, a lower coding rate may be required to compensate for the reduced coverage, and for this purpose, the normal mode and the power saving mode A different AL set and the number of candidates for each AL may be assumed, which may be defined in advance or indicated by a network. For example, when using the normal mode or 4 receiving antennas, the AL set can be 1, 2, 4, 8, and when using the power saving mode or 2 antennas, the AL set can be 4, 8, 16 have.

Also, the number of candidates for each aggregation level may be differently applied depending on whether or not the power saving technique is applied. For example, when a power saving technique is applied, a method of increasing the number of candidates of a high aggregation level and reducing the number of candidates of a low aggregation level may be considered.

As another method, when the power saving technique is applied, blind decoding for a candidate set at an aggregation level less than a predefined aggregation level or an aggregation level indicated by the network may be omitted.

-Search space type, monitored DCI format

When the power saving technique is applied, it may be predefined or indicated by the network to perform monitoring only for a specific type of search space set and/or a search space set set to monitor a specific radio network temporary identifier (RNTI). . This may be interpreted as monitoring only for more stable transmission when performance degradation such as coverage decrease is expected due to the power saving technique.

For example, when the power saving technique is applied, monitoring for CORESET that monitors non-fallback DCI (eg, DCI format 1_1) may be omitted.

-Duration

In the search space set setting, the duration time may mean the number of consecutive slots (ie, resources in the time domain of CORESET) that perform PDCCH monitoring from a location designated by a monitoring periodicity.

When the power saving technique is applied, the duration set in the specific search space set(s) may be changed. For example, when the search space set duration in the normal mode is greater than 1, the duration may be changed to 1 in the power saving mode and applied, and this may be interpreted as reducing blind decoding of the terminal.

Referring to FIG. 24, the terminal receives control resource configuration information from the network (S2410). Here, the control resource setting information may include a control resource set (CORESET) configuration consisting of a first parameter set and a search space set configuration consisting of a second parameter set.

Thereafter, the terminal receives power saving technique information from the network (S2420). Here, the power saving technique information may inform change of a specific parameter included in the first parameter set or the second parameter set. In addition, the value to be applied to the specific parameter may be included in the power saving technique information or the control resource configuration information.

Thereafter, the terminal receives the PDCCH based on the control resource configuration information and the changed specific parameter (S2430).

Here, the control resource setting information received by the terminal may inform the relationship between the CORESET and the corresponding CORESET setting. That is, the control resource setting information may include CORESET setting information, and the CORESET setting information may inform the terminal of a first CORESET setting, a second CORESET setting, and a third CORESET setting.

For a specific example, CORESET A may be a control resource based on a first CORESET setting, CORESET B may be a control resource based on a second CORESET setting, and CORESET C may be a control resource based on a third CORESET setting.

Here, when the control resource used by the terminal before receiving the power saving scheme information is CORESET B, that is, when the CORESET setting used by the terminal before receiving the power saving scheme information is the second CORESET setting, the terminal saves power. Upon receiving the technique information, the power saving technique information may be requested from the terminal to change the CORESET setting to the first CORESET setting. Thereafter, the terminal may receive the PDCCH using CORESET A based on the power saving scheme information.

Alternatively, referring to FIG. 25, the power saving scheme information may inform the identifier (ID) of CORESET that the terminal should monitor. Specifically, when the terminal is allocated CORESET A and CORESET B based on the control resource setting information, the terminal may perform monitoring for CORESET A and CORESET B before receiving the power saving scheme information. Here, if the terminal receives the power saving scheme information and the power saving scheme information includes the ID for CORESET C, the terminal may change the monitoring CORESET to CORESET C.

26 illustrates another example in which a method of receiving a PDCCH of a terminal according to some implementations of the present disclosure is applied. The example of FIG. 26 considers a case in which one CORESET is set to the terminal.

Here, the control resource setting information received by the terminal may inform the value of a parameter related to CORESET A according to the power level of the terminal or whether a power saving technique is applied. For a specific example, a value of a parameter applied to the CORESET A may be different for a case where the terminal operates in a normal mode and a case where the terminal operates in a power saving mode.

For example, when the terminal operates in the normal mode, the duration of the CORESET A may be 2 symbols, and the number of resource blocks of the CORESET A may be 60. In addition, when the terminal operates in the power saving mode, the duration of the CORESET A may be 3 symbols, and the number of resource blocks of the CORESET A may be 90.

In this case, referring to FIG. 26, the terminal operating in the normal mode sets the duration of CORESET A to 2 symbols and the number of resource blocks of CORESET A to 60, based on the control resource setting information, and the set CORESET A (i.e. , PDCCH may be received based on the dotted line portion of FIG. 26). Similarly, the terminal operating in the power saving mode sets the duration of CORESET A to 3 symbols and the number of resource blocks of CORESET A to 90 based on the control resource setting information, and the set CORESET A (i.e., the solid line part of FIG. ) Based on the PDCCH.

Meanwhile, FIGS. 25 and 26 illustrate examples in which the embodiments of the present specification are applied to CORESET, but since it is obvious that the embodiments of the present specification can be applied to a search space set, duplicate descriptions are omitted.

The claims set forth herein may be combined in a variety of ways. For example, the technical features of the method claims of the present specification may be combined to be implemented as a device, and the technical features of the device claims of the present specification may be combined to be implemented by a method. In addition, the technical characteristics of the method claim of the present specification and the technical characteristics of the device claim may be combined to be implemented as a device, and the technical characteristics of the method claim of the present specification and the technical characteristics of the device claim may be combined to be implemented by a method.

In addition to the terminal, the methods proposed in the present specification include at least one computer readable medium including instructions based on execution by at least one processor, and at least one processor. And one or more memories that are executablely connected by the one or more processors and store instructions, wherein the one or more processors execute the instructions to perform the methods proposed in the present specification, and are configured to control a terminal. It can also be done by means of an apparatus. In addition, it is obvious that according to the methods proposed in the present specification, an operation by a base station corresponding to an operation performed by the terminal may be considered.

Hereinafter, an example of a communication system to which the present disclosure is applied will be described.

Although not limited thereto, various descriptions, functions, procedures, proposals, methods, and/or operational flowcharts of the present disclosure disclosed in this document may be applied to various fields requiring wireless communication/connection (eg, 5G) between devices. have.

Hereinafter, it will be illustrated in more detail with reference to the drawings. In the following drawings/description, the same reference numerals may exemplify the same or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise indicated.

27 illustrates a communication system 1 applied to the present disclosure.

Referring to FIG. 27, a communication system 1 applied to the present disclosure includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless 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, wireless devices include robots 100a, vehicles 100b-1 and 100b-2, eXtended Reality (XR) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (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 vehicle, and a vehicle capable of performing inter-vehicle communication. 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, including HMD (Head-Mounted Device), HUD (Head-Up Display), TV, smartphone, It can be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, and the like. Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebook computers, etc.). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station/network node to another wireless device.

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 perform direct communication (e.g. sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. V2V (Vehicle to Vehicle)/V2X (Vehicle to Everything) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

Wireless communication/

connections

150a, 150b, and 150c may be established between the wireless devices 100a to 100f / base station 200 and the base station 200 / base station 200. Here, the wireless communication/connection includes various wireless access such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, Integrated Access Backhaul). This can be achieved through technology (eg 5G NR) Through wireless communication/

connections

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

connection

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

Meanwhile, NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz/60 kHz, it is dense-urban, lower latency. And a wider carrier bandwidth (wider carrier bandwidth) is supported, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported 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, for example, the frequency range of the two types (FR1, FR2) may be as shown in Table 11 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 described above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a band of 410MHz to 7125MHz as shown in Table 12 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.) or higher included in FR1 may include an unlicensed band. The unlicensed band can be used for a variety of purposes, and can be used, for example, for communication for vehicles (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 disclosure is applied will be described.

28 illustrates a wireless device applicable to the present disclosure.

Referring to FIG. 28, the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR). Here, {the first wireless device 100, the second wireless device 200} is the {wireless device 100x, the base station 200} and/or {wireless device 100x, wireless device 100x) of FIG. 27 } 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 information in the memory 104 to generate first information/signal, and then transmit a radio signal including the first information/signal through the transceiver 106. In addition, the processor 102 may store information obtained from signal processing of the second information/signal in the memory 104 after receiving a radio signal including the second information/signal through the transceiver 106. 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 perform some or all of the processes controlled by the processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow charts disclosed in this document. It can store software code including Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 106 may be coupled with the processor 102 and may transmit and/or receive radio signals through one or more antennas 108. The transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be mixed with an RF (Radio Frequency) unit. In the present disclosure, a wireless device may mean a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 and 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 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 store information obtained from signal processing of the fourth information/signal in the memory 204 after receiving a radio signal including the fourth information/signal through the transceiver 206. 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 perform some or all of the processes controlled by the processor 202, or instructions for performing the descriptions, functions, procedures, suggestions, methods and/or operational flow charts disclosed in this document. It can store software code including Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 206 may be connected to the processor 202 and may transmit and/or receive radio signals through 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 the present disclosure, a wireless device may mean a communication modem/circuit/chip.

Hereinafter, the 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). One or

more processors

102, 202 may be configured to generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, functions, procedures, proposals, methods, and/or operational flow charts disclosed in this document. Can be generated. One or

more processors

102, 202 may generate messages, control information, data, or information according to the description, function, procedure, suggestion, method, and/or operational flow chart disclosed herein. At least one processor (102, 202) generates a signal (e.g., a baseband signal) including PDU, SDU, message, control information, data or information according to the functions, procedures, proposals and/or methods disclosed herein. , It may be provided to one or more transceivers (106, 206). One or

more processors

102, 202 may receive signals (e.g., baseband signals) from one or

more transceivers

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

One or more of the

processors

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

processors

102 and 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 and 202. The description, functions, procedures, suggestions, methods, and/or operational flow charts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. The description, functions, procedures, proposals, methods and/or operational flow charts disclosed in this document are included in one or

more processors

102, 202, or stored in one or

more memories

104, 204, and are It may be driven by the

above processors

102 and 202. The descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and/or a set of instructions.

One or

more memories

104 and 204 may be connected to one or

more processors

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

more memories

104 and 204 may be composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium, and/or combinations thereof. One or

more memories

104 and 204 may be located inside and/or outside of one or

more processors

102 and 202. In addition, one or

more memories

104, 204 may be connected to one or

more processors

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

The one or

more transceivers

106 and 206 may transmit user data, control information, radio signals/channels, and the like mentioned in the methods and/or operation flow charts 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. mentioned in the description, functions, procedures, suggestions, methods and/or operation flow charts disclosed in this document from one or more other devices. have. For example, one or

more transceivers

106 and 206 may be connected to one or

more processors

102 and 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 radio 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 radio signals from one or more other devices. In addition, one or more transceivers (106, 206) may be connected with one or more antennas (108, 208), and one or more transceivers (106, 206) through one or more antennas (108, 208), the description and functionality disclosed in this document. It may be set to transmit and receive user data, control information, radio signals/channels, and the like mentioned in a procedure, a proposal, a method and/or an operation flowchart. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). One or more transceivers (106, 206) in order to process the received user data, control information, radio signal / channel, etc. using one or more processors (102, 202), the received radio signal / channel, etc. in the RF band signal. 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 a baseband signal to an RF band signal. To this end, one or more of the

transceivers

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

Hereinafter, an example of a signal processing circuit to which the present disclosure is applied will be described.

29 illustrates a signal processing circuit for a transmission signal.

Referring to FIG. 29, 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. 29 may be performed in the

processors

102 and 202 and/or the

transceivers

106 and 206 of FIG. 28. The hardware elements of FIG. 29 may be implemented in the

processors

102 and 202 and/or the

transceivers

106 and 206 of FIG. 28. For example, blocks 1010 to 1060 may be implemented in the

processors

102 and 202 of FIG. 28. Also, blocks 1010 to 1050 may be implemented in the

processors

102 and 202 of FIG. 28, and block 1060 may be implemented in the

transceivers

106 and 206 of FIG. 28.

The codeword may be converted into a wireless signal through the signal processing circuit 1000 of FIG. 29. Here, the codeword is an encoded 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. The scramble sequence used for scramble is generated based on an initialization value, and the initialization value may include ID information of a wireless device. The scrambled bit sequence may be modulated by the modulator 1020 into a modulation symbol sequence. The modulation scheme 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. The modulation symbols of each transport layer may be mapped to the corresponding antenna port(s) by the precoder 1040 (precoding). The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 by the N*M precoding matrix W. 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 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, CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain, and may include 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 as the reverse of the signal processing process 1010 to 1060 of FIG. 29. For example, a wireless device (eg, 100 and 200 in FIG. 28) may receive a wireless signal from the outside through an antenna port/transmitter. 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 canceller, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be reconstructed into a codeword through a resource de-mapper process, a postcoding process, a demodulation process, and a de-scramble process. The codeword may be restored to an original information block through decoding. Accordingly, a signal processing circuit (not shown) for a received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

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

30 shows another example of a wireless device applied to the present disclosure. The wireless device may be implemented in various forms according to use-examples/services (see FIG. 27).

Referring to FIG. 30, the

wireless devices

100 and 200 correspond to the

wireless devices

100 and 200 of FIG. 28, and various elements, components, units/units, and/or modules ). 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 a communication circuit 112 and a transceiver(s) 114. For example, the communication circuit 112 may include one or

more processors

102 and 202 and/or one or

more memories

104 and 204 of FIG. 28. For example, transceiver(s) 114 may include one or more transceivers 106,206 and/or one or more antennas 108,208 of FIG. 28. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls all 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 an external (eg, other 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 variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an I/O unit, a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (FIGS. 27, 100a), vehicles (FIGS. 27, 100b-1, 100b-2), XR devices (FIGS. 27, 100c), portable devices (FIGS. 27, 100d), and home appliances. (Figs. 27, 100e), IoT devices (Figs. 27, 100f), digital broadcasting terminals, hologram devices, public safety devices, MTC devices, medical devices, fintech devices (or financial devices), security devices, climate/environment devices, It may be implemented in the form of an AI server/device (FIGS. 27 and 400), a base station (FIGS. 27 and 200), and a network node. The wireless device can be used in a mobile or fixed location depending on the use-example/service.

In FIG. 30, various elements, components, units/units, and/or modules in the

wireless devices

100 and 200 may be connected to each other through a wired interface, or at least part 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, 140) are connected through the communication unit 110. Can be connected wirelessly. In addition, each element, component, unit/unit, and/or module in the

wireless device

100 and 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 control unit 120 may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, and a memory control processor. As another example, the memory unit 130 includes 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, an implementation example of FIG. 30 will be described in more detail with reference to the drawings.

Hereinafter, an example of a portable device to which the present disclosure is applied will be described.

31 illustrates a portable device applied to the present disclosure. Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), and portable computers (eg, notebook computers). The portable 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. 31, 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. ) Can be included. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130/140a to 140c correspond to blocks 110 to 130/140 of FIG. 30, respectively.

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 perform various operations by controlling components of the portable device 100. The controller 120 may include an application processor (AP). The memory unit 130 may store data/parameters/programs/codes/commands required for driving the portable device 100. Also, the memory unit 130 may store input/output data/information, and the like. 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 connection between the portable device 100 and other external devices. The interface unit 140b may include various ports (eg, audio input/output ports, video input/output ports) for connection with external devices. 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 acquires 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 information/signals stored in the memory into wireless signals, and may directly transmit the converted wireless signals to other wireless devices or to a base station. In addition, after receiving a radio signal from another radio device or a base station, the communication unit 110 may restore the received radio signal to the 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, heptic) through the input/output unit 140c.

Hereinafter, an example of a vehicle or an autonomous vehicle to which the present disclosure is applied will be described.

32 illustrates a vehicle or an autonomous vehicle applied to the present disclosure. The vehicle or autonomous vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), or a ship.

Referring to FIG. 32, the vehicle or autonomous 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 unit (140d). The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110/130/140a to 140d correspond to blocks 110/130/140 of FIG. 30, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, base stations (e.g. base stations, roadside base stations, etc.), and servers. The controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel 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 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 is an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, and a vehicle advancement. /Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, etc. may be included. The autonomous driving unit 140d is a technology for maintaining a driving lane, a technology for automatically adjusting the speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and for driving by automatically setting a route when a destination is set. Technology, etc. can be implemented.

For example, the communication unit 110 may receive map data and traffic information data 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 so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving path according to the driving plan (eg, speed/direction adjustment). During autonomous driving, the communication unit 110 asynchronously/periodically acquires the latest traffic information data from an external server, and may acquire surrounding traffic information data from surrounding vehicles. In addition, 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 the driving plan based on the newly acquired data/information. The communication unit 110 may transmit information about a vehicle location, an autonomous driving route, and a driving plan 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 autonomously driving vehicles, and may provide the predicted traffic information data to the vehicle or autonomously driving vehicles.

Hereinafter, an example of an AR/VR and a vehicle to which the present disclosure is applied will be described.

33 illustrates a vehicle applied to the present disclosure. Vehicles may also be implemented as means of transport, trains, aircraft, and ships.

Referring to FIG. 33, the vehicle 100 may include a communication unit 110, a control unit 120, a memory unit 130, an input/output unit 140a, and a position measurement unit 140b. Here, blocks 110 to 130/140a to 140b correspond to blocks 110 to 130/140 of FIG. 30, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other vehicles or external devices such as a base station. The controller 120 may perform various operations by controlling components of the vehicle 100. The memory unit 130 may store data/parameters/programs/codes/commands supporting various functions of the vehicle 100. The input/output unit 140a may output an AR/VR object based on information in the memory unit 130. The input/output unit 140a may include a HUD. The location measurement unit 140b may obtain location information of the vehicle 100. The location information may include absolute location information of the vehicle 100, location information within a driving line, acceleration information, location information with surrounding vehicles, and the like. The location measurement unit 140b may include GPS and various sensors.

For example, the communication unit 110 of the vehicle 100 may receive map information, traffic information, etc. from an external server and store it in the memory unit 130. The location measurement unit 140b may acquire vehicle location information through GPS and various sensors and store it in the memory unit 130. The controller 120 may generate a virtual object based on map information, traffic information, vehicle location information, and the like, and the input/output unit 140a may display the generated virtual object on a window in the vehicle (1410, 1420). In addition, the controller 120 may determine whether the vehicle 100 is operating normally within the driving line based on the vehicle location information. When the vehicle 100 deviates from the driving line abnormally, the control unit 120 may display a warning on the window of the vehicle through the input/output unit 140a. In addition, the control unit 120 may broadcast a warning message regarding a driving abnormality to nearby vehicles through the communication unit 110. Depending on the situation, the controller 120 may transmit location information of the vehicle and information on driving/vehicle abnormalities to a related organization through the communication unit 110.

Hereinafter, an example of an XR device to which the present disclosure is applied will be described.

34 illustrates an XR device applied to the present disclosure. The XR device may be implemented as an HMD, a head-up display (HUD) provided in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like.

Referring to FIG. 34, the XR device 100a may include a communication unit 110, a control unit 120, a memory unit 130, an input/output unit 140a, a sensor unit 140b, and a power supply unit 140c. . Here, blocks 110 to 130/140a to 140c correspond to blocks 110 to 130/140 of FIG. 30, respectively.

The communication unit 110 may transmit and receive signals (eg, media data, control signals, etc.) with other wireless devices, portable devices, or external devices such as a media server. Media data may include images, images, and sounds. The controller 120 may perform various operations by controlling components of the XR device 100a. For example, the controller 120 may be configured to control and/or perform procedures such as video/image acquisition, (video/image) encoding, and metadata generation and processing. The memory unit 130 may store data/parameters/programs/codes/commands required for driving the XR device 100a/generating an XR object. The input/output unit 140a may obtain control information, data, etc. from the outside, and may output the generated XR object. The input/output unit 140a may include a camera, a microphone, a user input unit, a display unit, a speaker, and/or a haptic module. The sensor unit 140b may obtain XR device status, surrounding environment information, user information, and the like. The sensor unit 140b may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, and/or a radar. have. The power supply unit 140c supplies power to the XR device 100a, and may include a wired/wireless charging circuit, a battery, and the like.

As an example, the memory unit 130 of the XR device 100a may include information (eg, data, etc.) necessary for generating an XR object (eg, AR/VR/MR object). The input/output unit 140a may obtain a command to manipulate the XR device 100a from the user, and the controller 120 may drive the XR device 100a according to the user's driving command. For example, when a user tries to watch a movie, news, etc. through the XR device 100a, the controller 120 transmits the content request information through the communication unit 130 to another device (for example, the mobile device 100b) or Can be sent to the media server. The communication unit 130 may download/stream contents such as movies and news from another device (eg, the mobile device 100b) or a media server to the memory unit 130. The control unit 120 controls and/or performs procedures such as video/image acquisition, (video/image) encoding, and metadata generation/processing for the content, and is acquired through the input/output unit 140a/sensor unit 140b. An XR object may be generated/output based on information on a surrounding space or a real object.

In addition, the XR device 100a is wirelessly connected to the mobile device 100b through the communication unit 110, and the operation of the XR device 100a may be controlled by the mobile device 100b. For example, the portable device 100b may operate as a controller for the XR device 100a. To this end, the XR device 100a may obtain 3D location information of the portable device 100b, and then generate and output an XR object corresponding to the portable device 100b.

Hereinafter, an example of a robot to which the present disclosure is applied will be described.

35 illustrates a robot applied to the present disclosure. Robots can be classified into industrial, medical, household, military, etc. depending on the purpose or field of use.

Referring to FIG. 35, the robot 100 may include a communication unit 110, a control unit 120, a memory unit 130, an input/output unit 140a, a sensor unit 140b, and a driving unit 140c. Here, blocks 110 to 130/140a to 140c correspond to blocks 110 to 130/140 of FIG. 30, respectively.

The communication unit 110 may transmit and receive signals (eg, driving information, control signals, etc.) with other wireless devices, other robots, or external devices such as a control server. The controller 120 may perform various operations by controlling components of the robot 100. The memory unit 130 may store data/parameters/programs/codes/commands supporting various functions of the robot 100. The input/output unit 140a acquires information from the outside of the robot 100 and may output the information to the outside of the robot 100. The input/output unit 140a may include a camera, a microphone, a user input unit, a display unit, a speaker, and/or a haptic module. The sensor unit 140b may obtain internal information, surrounding environment information, user information, and the like of the robot 100. The sensor unit 140b may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, a radar, and the like. The driving unit 140c may perform various physical operations such as moving a robot joint. In addition, the driving unit 140c may make the robot 100 travel on the ground or fly in the air. The driving unit 140c may include an actuator, a motor, a wheel, a brake, a propeller, and the like.

Hereinafter, an example of an AI device to which the present disclosure is applied will be described.

36 illustrates an AI device applied to the present disclosure. AI devices are fixed devices such as TVs, projectors, smartphones, PCs, notebooks, digital broadcasting terminals, tablet PCs, wearable devices, set-top boxes (STBs), radios, washing machines, refrigerators, digital signage, robots, vehicles, etc. It can be implemented with possible devices.

Referring to FIG. 36, the AI device 100 includes a communication unit 110, a control unit 120, a memory unit 130, an input/output unit 140a/140b, a running processor unit 140c, and a sensor unit 140d. It may include. Blocks 110 to 130/140a to 140d correspond to blocks 110 to 130/140 of FIG. 30, respectively.

The communication unit 110 uses wired/wireless communication technology to provide external devices such as other AI devices (e.g., FIGS. 27, 100x, 200, 400) or AI servers (e.g., 400 in FIG. 27), and wired/wireless signals (e.g., sensor information). , User input, learning model, control signals, etc.). To this end, the communication unit 110 may transmit information in the memory unit 130 to an external device or may transmit a signal received from the external device to the memory unit 130.

The controller 120 may determine at least one executable operation of the AI device 100 based on information determined or generated using a data analysis algorithm or a machine learning algorithm. In addition, the controller 120 may perform a determined operation by controlling the components of the AI device 100. For example, the control unit 120 may request, search, receive, or utilize data from the learning processor unit 140c or the memory unit 130, and may be a predicted or desirable operation among at least one executable operation. Components of the AI device 100 can be controlled to execute the operation. In addition, the control unit 120 collects history information including the operation content or user's feedback on the operation of the AI device 100 and stores it in the memory unit 130 or the running processor unit 140c, or the AI server ( 27 and 400). The collected history information can be used to update the learning model.

The memory unit 130 may store data supporting various functions of the AI device 100. For example, the memory unit 130 may store data obtained from the input unit 140a, data obtained from the communication unit 110, output data from the running processor unit 140c, and data obtained from the sensing unit 140. In addition, the memory unit 130 may store control information and/or software codes necessary for the operation/execution of the controller 120.

The input unit 140a may acquire various types of data from the outside of the AI device 100. For example, the input unit 140a may acquire training data for model training and input data to which the training model is to be applied. The input unit 140a may include a camera, a microphone, and/or a user input unit. The output unit 140b may generate output related to visual, auditory or tactile sense. The output unit 140b may include a display unit, a speaker, and/or a haptic module. The sensing unit 140 may obtain at least one of internal information of the AI device 100, surrounding environment information of the AI device 100, and user information by using various sensors. The sensing unit 140 may include a proximity sensor, an illuminance sensor, an acceleration sensor, a magnetic sensor, a gyro sensor, an inertial sensor, an RGB sensor, an IR sensor, a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor, a microphone, and/or a radar. have.

The learning processor unit 140c may train a model composed of an artificial neural network using the training data. The running processor unit 140c may perform AI processing together with the running processor unit of the AI server (FIGS. 27 and 400 ). The learning processor unit 140c may process information received from an external device through the communication unit 110 and/or information stored in the memory unit 130. In addition, the output value of the learning processor unit 140c may be transmitted to an external device through the communication unit 110 and/or may be stored in the memory unit 130.

Claims

In a method for receiving a physical downlink control channel (PDCCH) performed by a terminal in a wireless communication system,

Receiving control resource setting information from the network, wherein the control resource setting information is a control resource set (CORESET) configuration consisting of a first parameter set and a search space set configuration consisting of a second parameter set. Including,

Receiving power saving technique information, wherein the power saving technique information notifies a change of a specific parameter included in the first parameter set or the second parameter set, and

And receiving the PDCCH based on the control resource configuration information and the changed specific parameter.
The method of claim 1,

Each of the first parameter set and the second parameter set includes a general mode specific parameter and a power saving mode specific parameter.
The method of claim 2,

Based on the specific parameter being the general mode specific parameter, the change is characterized in that the specific parameter is changed to the power saving mode specific parameter.
The method of claim 2,

Based on the specific parameter being the power saving mode exclusive parameter, the change is characterized in that the specific parameter is changed to the general mode exclusive parameter.
The method of claim 1,

The control resource setting information includes a plurality of values applicable to each of the parameters included in the first parameter set and the second parameter set,

Wherein the plurality of values include a general mode only value and a power saving mode only value.
The method of claim 5,

Based on the value of the specific parameter being the value exclusively for the general mode, the change is characterized in that the value of the specific parameter is changed to a value exclusively for the power saving mode.
The method of claim 5,

Based on the value of the specific parameter being a value exclusively for the power saving mode, the change changes the value of the specific parameter to a value exclusively for the general mode.
The method of claim 5,

The change of the specific parameter is a change to a specific value among the plurality of values,

The method of claim 1, wherein the power saving technique information informs the specific value.
The method of claim 1,

The method of claim 1, wherein the number of each set of CORESET and search space set in the terminal based on the control resource setting information is one.
The method of claim 1,

The parameters are CORESET duration, number of resource blocks (RB) of CORESET, whether interleaving is applied, antenna port quasi co-location (QCL), downlink control information (DCI) ) In the transmission configuration indication (transmission configuration indication: TCI) field is included, characterized in that related to at least one of the precoder granularity (precoder granularity).
The method of claim 1,

The parameters include association between CORESET and a set of search spaces, monitoring occasion, aggregation level (AL), search space type, monitored DCI format, monitoring periodicity, The method, characterized in that related to at least one of the number of slots in which the terminal performs PDCCH monitoring by a monitoring period.
The method of claim 1,

The first parameter set and the second parameter set are defined in advance or are determined by higher layer signaling.
The method of claim 1,

The terminal transmits the report information to the network,

The report information, characterized in that informing that the terminal operates in a power saving mode in a normal mode.
The method of claim 1,

The power saving technique information informs the power saving technique,

The method, characterized in that, based on the UE performing an operation related to the power saving scheme, the UE changes the specific parameter.
The terminal,

One or more memories for storing instructions;

One or more transceivers; And

And one or more processors connecting the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions,

Receiving control resource setting information from the network, wherein the control resource setting information is a control resource set (CORESET) configuration consisting of a first parameter set and a search space set configuration consisting of a second parameter set. Including,

Receiving power saving technique information, wherein the power saving technique information notifies a change of a specific parameter included in the first parameter set or the second parameter set, and

And receiving a physical downlink control channel (PDCCH) based on the control resource configuration information and the changed specific parameter.
In the device (apparatus) set to control the terminal, the device,

One or more processors; And

The one or more processors are executablely connected by the one or more processors and include one or more memories for storing instructions, wherein the one or more processors execute the instructions,

Receiving control resource setting information from the network, wherein the control resource setting information is a control resource set (CORESET) configuration consisting of a first parameter set and a search space set configuration consisting of a second parameter set. Including,

Receiving power saving technique information, wherein the power saving technique information notifies a change of a specific parameter included in the first parameter set or the second parameter set, and

A device, characterized in that for receiving a physical downlink control channel (PDCCH) based on the control resource configuration information and the changed specific parameter.
In the at least one computer readable recording medium (computer readable medium) comprising an instruction (instruction) based on being executed by at least one processor (processor),

Receiving control resource setting information from the network, wherein the control resource setting information is a control resource set (CORESET) configuration consisting of a first parameter set and a search space set configuration consisting of a second parameter set. Including,

Receiving power saving technique information, wherein the power saving technique information notifies a change of a specific parameter included in the first parameter set or the second parameter set, and

A device, characterized in that for receiving a physical downlink control channel (PDCCH) based on the control resource configuration information and the changed specific parameter.
In a physical downlink control channel (PDCCH) transmission method performed by a base station in a wireless communication system,

Receiving control resource setting information from the terminal, wherein the control resource setting information includes setting a control resource set (CORESET) consisting of a first parameter set and a search space set consisting of a second parameter set. Including,

Transmitting power saving technique information, wherein the power saving technique information notifies a change of a specific parameter included in the first parameter set or the second parameter set, and

And transmitting the PDCCH based on the control resource configuration information and the changed specific parameter.
The base station,

One or more memories for storing instructions;

One or more transceivers; And

And one or more processors connecting the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions,

Receiving control resource setting information from the terminal, wherein the control resource setting information is a control resource set (CORESET) configuration consisting of a first parameter set and a search space set configuration consisting of a second parameter set. Including,

Transmitting power saving technique information, wherein the power saving technique information notifies a change of a specific parameter included in the first parameter set or the second parameter set, and

And transmitting the PDCCH based on the control resource configuration information and the changed specific parameter.