Method for determining a time point of applying a changed minimum scheduling offset in a wireless communication system and a device applying the method

Abstract

A method for determining a time point for applying a changed minimum scheduling offset in a wireless communication system and a device applying the method are provided. The method comprises the following steps: receiving a first DCI in a time slot n of a scheduling cell, the first DCI including information for notifying a change in a K2min value as a minimum scheduling offset; after a time slot n+X of the scheduling cell, receiving a second DCI based on the changed K2min value; and sending a PUSCH scheduled by the second DCI. The value of X is determined based on: K0min, which is the minimum scheduling offset currently applied to the scheduled cell scheduled by the first DCI; the subcarrier spacing setting of the scheduling cell; the subcarrier spacing setting of the scheduled cell; a predetermined value depending on the subcarrier spacing of the scheduling cell, and the like.

Description

Technical Field

[0001] The present disclosure relates to a method for determining when to apply a changed minimum scheduling offset in a wireless communication system and an apparatus using the method. Background Art

[0002] As more and more communication devices require higher communication capacity, advanced mobile broadband communication is needed compared to existing radio access technologies (RATs). Large-scale machine type communication (MTC), which provides various services anytime and anywhere by connecting multiple devices and multiple objects, is also a major issue to be considered in next-generation communications. In addition, the design of communication systems considering services or user equipment (UE) that are sensitive to reliability and delay is under discussion. The introduction of next-generation RATs that take into account enhanced mobile broadband communications, large-scale MTC, and ultra-reliable low-latency communications (URLLC) is under discussion. In this disclosure, for convenience of description, the technology may be referred to as a new RAT or a new radio (NR). NR is also referred to as a fifth generation (5G) system.

[0003] As UE performance and functionality improve, such as display resolution, display size, processor, memory, and UE applications increase, power consumption also increases. Because the UE may be battery-limited, it is important to reduce power consumption. This is also true for UEs operating in NR.

[0004] As an example for reducing UE power consumption, there is cross-slot scheduling. The time slot for receiving the physical downlink control channel (PDCCH) is the same as the time slot for receiving the physical downlink shared channel (PDSCH) scheduled by the PDCCH, which is called simultaneous slot scheduling. In cross-slot scheduling, the PDCCH and the PDSCH scheduled by the PDCCH can be in different time slots. The PDCCH is usually received and decoded only in some symbols within the time slot (for example, the first 3 symbols of the time slot). When cross-slot scheduling is applied, the UE can save power by putting the radio frequency (RF) unit to sleep in the symbol (time slot) after receiving the PDCCH and before receiving the PDSCH.

[0005] The network sets the minimum applicable K0 / K2 value and can indicate to the UE the minimum applicable time slot offset between the PDCCH (more specifically, downlink control information (DCI)) and the PDSCH / PUSCH (physical uplink shared channel) scheduled by the DCI. The minimum applicable time slot offset means the minimum value of the offset (difference) between the time slot in which the DCI is received and the PDSCH / PUSCH time slot scheduled by the DCI, and can be called the minimum scheduling offset.

[0006] By the way, when indicating / changing the minimum scheduling offset, it is possible to define when to apply the indication / change by an "apply delay" value.

[0007] When cross-carrier scheduling is used, in particular, in carrier aggregation where the parameter sets of the scheduling cell and the scheduled cell are different, it is necessary to clearly define how to determine the application delay value. Otherwise, it may be difficult to apply the power saving technology of the UE. Summary of the invention

[0008] Technical issues

[0009] The technical problem to be solved by the present invention is to provide a method for determining when to apply a changed minimum scheduling offset in a wireless communication system and a device using the method.

[0010] Technical Solutions

[0011] In one aspect, a method for determining when to apply a changed minimum scheduling offset in a wireless communication system is provided. The method includes: receiving a first downlink control information (DCI) in a time slot n of a scheduling cell, the first downlink control information (DCI) including information for a change in a value of K2min as a minimum scheduling offset, receiving a second DCI based on the changed K2min value from a time slot n+X of the scheduling cell, and transmitting a physical uplink shared channel (PUSCH) scheduled by the second DCI. The value of X is i) obtained by multiplying the currently applied minimum scheduling offset K0min (Y) in the scheduled cell scheduled by the first DCI by 2 μscheduling / 2 μscheduled And then the maximum value among the first value obtained by rounding up (ceiling) and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell, and μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell.

[0012] In another aspect, a user equipment (UE) is provided. The UE includes a transceiver for sending and receiving radio signals; and a processor connected to the transceiver for operation. The processor is configured to: receive a first downlink control information (DCI) in a time slot n of a scheduling cell, the first downlink control information (DCI) including information for a change in the value of K2min as a minimum scheduling offset, receive a second DCI based on the changed K2min value from a time slot n+X of the scheduling cell, and send a physical uplink shared channel (PUSCH) scheduled by the second DCI. The value of X is i) obtained by multiplying the currently applied minimum scheduling offset K0min (Y) in the scheduled cell scheduled by the first DCI by 2 μscheduling / 2 μscheduledAnd then the maximum value among the first value obtained by rounding up and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell, and μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell.

[0013] In yet another aspect, a method for operating a base station in a wireless communication system is provided. The method includes: sending a first downlink control information (DCI) to a user equipment (UE) in a time slot n of a scheduling cell, the first downlink control information (DCI) including information for changing the value of K2min as a minimum scheduling offset; sending a second DCI based on the changed K2min value to the UE from a time slot n+X of the scheduling cell; and receiving a physical uplink shared channel (PUSCH) scheduled by the second DCI from the UE. The value of X is i) obtained by multiplying the currently applied minimum scheduling offset K0min (Y) in the scheduled cell scheduled by the first DCI by 2 μscheduling / 2 μscheduled And then the maximum value among the first value obtained by rounding up and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell, and μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell.

[0014] In yet another aspect, a base station is provided. The base station includes a transceiver for sending and receiving radio signals and a processor connected to the transceiver for operation. The processor is configured to: send a first downlink control information (DCI) to a user equipment (UE) in a time slot n of a scheduling cell, the first downlink control information (DCI) including information for a change in the value of K2min as a minimum scheduling offset; send a second DCI based on the changed K2min value to the UE from a time slot n+X of the scheduling cell; and receive a physical uplink shared channel (PUSCH) scheduled by the second DCI from the UE. The value of X is i) obtained by multiplying the currently applied minimum scheduling offset K0min(Y) in the scheduled cell scheduled by the first DCI by 2 μscheduling / 2 μscheduled And then performing rounding up to obtain a first value and ii) a second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell, and μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell.

[0015] In yet another aspect, at least one computer readable medium (CRM) is provided, comprising instructions based on being executed by at least one processor. The CRM receives a first downlink control information (DCI) in a time slot n of a scheduling cell, the first downlink control information (DCI) including information for changing the value of K2min as a minimum scheduling offset, receives a second DCI based on the changed K2min value from a time slot n+X of the scheduling cell, and transmits a physical uplink shared channel (PUSCH) scheduled by the second DCI. The value of X is i) obtained by multiplying the currently applied minimum scheduling offset K0min (Y) in the scheduled cell scheduled by the first DCI by 2 μscheduling / 2 μscheduled And then the maximum value among the first value obtained by rounding up and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell, and μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell.

[0016] In yet another aspect, a device operating in a wireless communication system is provided. The device includes a processor and a memory operably connected to the processor. The processor is configured to: receive a first downlink control information (DCI) in a time slot n of a scheduling cell, the first downlink control information (DCI) including information for changing the value of K2min as a minimum scheduling offset, receive a second DCI based on the changed K2min value from a time slot n+X of the scheduling cell, and send a physical uplink shared channel (PUSCH) scheduled by the second DCI. The value of X is i) obtained by multiplying the currently applied minimum scheduling offset K0min (Y) in the scheduled cell scheduled by the first DCI by 2 μscheduling / 2 μscheduled And then the maximum value among the first value obtained by rounding up and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell, and μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell.

[0017] Beneficial Effects

[0018] When a change in the minimum scheduling offset is indicated in carrier aggregation using different parameter sets (e.g., different subcarrier spacing) in the scheduling cell and the scheduled cell, by clarifying the application delay value indicating the time of application change, no misunderstanding occurs between the network and the UE. As a result, the UE can accurately know the time slot / symbol in which the UE can perform a power saving operation (e.g., a sleep operation), thereby increasing communication efficiency. In addition, by determining the application delay value taking into account the position of the DCI indicating the change in the time slot, impossible or difficult UE operations are prevented from occurring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A wireless communication system to which the present disclosure can be applied is shown.

[0020] Figure 2 is a diagram illustrating a radio protocol architecture for a user plane.

[0021] Figure 3 is a diagram showing a radio protocol architecture for a control plane.

[0022] Figure 4 Another example of a wireless communication system to which the present disclosure can be applied is shown.

[0023] Figure 5 Diagram showing the functional division between NG-RAN and 5GC.

[0024] Figure 6 The diagram illustrates an example of a frame structure that can be applied in NR.

[0025] Figure 7 The figure shows the time slot structure of the NR frame.

[0026] Figure 8 Figure CORESET.

[0027] Fig. 9 Figure 1 shows the structure of a self-contained time slot.

[0028] Fig.10 An example of downlink transmission / reception operation is shown.

[0029] Fig.11 An example of uplink transmission / reception operation is shown.

[0030] Fig.12 An example of an uplink grant is shown.

[0031] Fig.13 An example of a permissionless initial transmission is shown.

[0032] Fig.14 is an example of applying an application delay.

[0033] Fig.15 The figure shows the location of the CORESET used for PDCCH monitoring.

[0034] Fig.16 The diagram shows a method for determining an application delay value according to option 3.

[0035] Fig.17 It is an application Fig.16 An example of a method.

[0036] Fig.18 It is an application Fig.16 Another example of the method.

[0037] Fig.19 The figure shows the signaling method between the network (base station) and the UE.

[0038] Fig. 20 The figure shows the signaling method between the network (base station) and the UE.

[0039] Fig.21 The diagram illustrates a wireless device suitable for use with the present disclosure.

[0040] Fig. 22 The diagram shows the signal processing circuit used to transmit the signal.

[0041] Fig.23 Another example of the structure of the signal processing module in the transmission device is shown.

[0042] Fig.24 An example of a wireless communication device according to an embodiment of the present disclosure is illustrated.

[0043] Fig.25 An example of a processor 2000 is shown.

[0044] Fig.26 An example of a processor 3000 is shown.

[0045] Fig. 27 Another example of a wireless device is shown.

[0046] Fig.28 Another example of a wireless device to which this specification is applied is shown.

[0047] Fig.29 The illustrations apply to portable devices in this manual.

[0048] Fig.30 The diagram shows a communication system 1 applied to the present specification.

[0049] Fig.31 Illustration of a vehicle or an autonomous vehicle to which this document may be applied. DETAILED DESCRIPTION

[0050] Figure 1 A wireless communication system to which the present disclosure can be applied is shown. The wireless communication system may be referred to as an Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) or a Long Term Evolution (LTE) / LTE-A system.

[0051] The E-UTRAN includes at least one base station (BS) 20, which provides a control plane and a user plane for a user equipment (UE) 10. The UE 10 may be fixed or mobile, and may be referred to as another term, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, a terminal, etc. The BS 20 is typically a fixed station that communicates with the UE 10, and may be referred to as another term, such as an evolved Node B (eNB), a base transceiver system (BTS), an access point, a gNB, etc.

[0052] The BSs 20 are connected to each other using an X2 interface. The BSs 20 are also connected to an Evolved Packet Core (EPC) 30 using an S1 interface, more specifically, to a Mobility Management Entity (MME) via S1-MME and to a Serving Gateway (S-GW) via S1-U.

[0053] The EPC 30 includes an MME, an S-GW, and a packet data network gateway (P-GW). The MME has access information of the UE or capability information of the UE, and such information is generally used for mobility management of the UE. The S-GW is a gateway having the E-UTRAN as an endpoint. The P-GW is a gateway having the PDN as an endpoint.

[0054] The layers of the radio interface protocol between the UE and the network can be divided into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the open system interconnection (OSI) simulation known in the communication system. Among them, the physical (PHY) layer belonging to the first layer provides an information transfer service by using a physical channel, and the radio resource control (RRC) layer belonging to the third layer is used to control radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS.

[0055] Figure 2 is a diagram illustrating a radio protocol architecture for a user plane. Figure 3 is a diagram showing a wireless protocol architecture for a control plane. The user plane is a protocol stack for user data transmission. The control plane is a protocol stack for control signal transmission.

[0056] refer to Figure 2 and 3, the PHY layer provides information transfer services to higher layers via physical channels. The PHY layer is connected to the Media Access Control (MAC) layer, which is a higher layer of the PHY layer, via a transport channel. Data is transferred between the MAC layer and the PHY layer via the transport channel. Transport channels are classified according to how data is transferred via a radio interface and what kind of characteristic data is transferred.

[0057] Through the physical channel, data moves between different PHY layers, ie, PHY layers of a transmitter and a receiver. The physical channel may be modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme and use time and frequency as radio resources.

[0058] The functions of the MAC layer include mapping between logical channels and transport channels and multiplexing / demultiplexing of transport blocks provided by physical channels on transport channels of MAC service data units (SDUs) belonging to logical channels. The MAC layer provides services to the radio link control (RLC) layer through logical channels.

[0059] The functions of the RLC layer include concatenation, segmentation, and reassembly of RLC SDUs. In order to ensure the quality of various types of services (QoS) required by radio bearers (RBs), the RLC layer provides three types of operation modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM). AM RLC provides error correction through automatic repeat request (ARQ).

[0060] The RRC layer is defined only in the control plane. The RRC layer is related to the configuration, reconfiguration, and release of radio bearers, and is responsible for control of logical channels, transport channels, and physical channels. RB means a logical path provided by the first layer (PHY layer) and the second layer (MAC layer, RLC layer, and PDCP layer) to facilitate data transmission between the UE and the network.

[0061] The functions of the Packet Data Convergence Protocol (PDCP) on the user plane include transmission and header compression of user data, and encryption. The functions of the PDCP layer on the control plane include transmission and encryption / integrity protection of control plane data.

[0062] RB configuration means a process of defining the characteristics of a radio protocol layer and a channel in order to provide a specific service and configuring each detailed parameter and operation method. RB can be divided into two types of signaling RB (SRB) and data RB (DRB). SRB is used as a channel through which RRC messages are sent on the control plane, and DRB is used as a channel through which user data is sent on the user plane.

[0063] If an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected state. If not, the UE is in the RRC idle state.

[0064] The downlink transport channel through which data is sent from the network to the UE includes a broadcast channel (BCH) through which system information is sent and a downlink shared channel (SCH) through which user traffic or control messages are sent. Traffic or control messages for downlink multicast or broadcast services may be sent through the downlink SCH, or may be sent through an additional downlink multicast channel (MCH). Meanwhile, the uplink transport channel through which data is sent from the UE to the network includes a random access channel (RACH) through which an initial control message is sent and an uplink shared channel (SCH) through which user traffic or control messages are sent.

[0065] Logical channels placed above and mapped to the transport channels include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), and a multicast traffic channel (MTCH).

[0066] A physical channel includes several OFDM symbols in the time domain and several subcarriers in the frequency domain. A subframe includes multiple OFDM symbols in the time domain. An RB is a resource allocation unit and includes multiple OFDM symbols and multiple subcarriers. In addition, each subframe may use a specific subcarrier of a specific OFDM symbol (e.g., the first OFDM symbol) of a corresponding subframe for a physical downlink control channel (PDCCH), i.e., an L1 / L2 control channel. A transmission time interval (TTI) is a unit time for transmission.

[0067] Hereinafter, new radio access technology (new RAT, NR) will be described.

[0068] As more and more communication devices require more communication capacity, improved mobile broadband communication is needed compared to existing radio access technologies. In addition, large-scale machine type communication (MTC) that provides various services by connecting many devices and objects is one of the main issues to be considered in the next generation of communications. In addition, the design of communication systems considering reliability / delay-sensitive services / UEs is being discussed. The introduction of next-generation radio access technologies considering enhanced mobile broadband communication (eMBB), massive mobile communication (mMTC), and ultra-reliable low-latency communication (URLLC) is discussed. For convenience, in this disclosure, this new technology may be referred to as a new radio access technology (new RAT or NR).

[0069] Figure 4Another example of a wireless communication system to which the present disclosure can be applied is illustrated.

[0070] refer to Figure 4 , NG-RAN may include gNB 21 and / or ng-eNB 22 that provide user plane and control plane protocol termination to UE. gNB 21 and ng-eNB 22 are connected via an Xn interface. gNB 21 and ng-eNB 22 are connected to the 5G core network (5GC) via an NG interface. More specifically, gNB and eNB may be connected to an access and mobility management function (AMF) 31 via an NG-C interface and connected to a user plane function (UPF) 31 via an NG-U interface.

[0071] Figure 5 Diagram showing the functional division between NG-RAN and 5GC.

[0072] gNB can provide functions such as inter-cell radio resource management (inter-cell RRM), radio bearer management (RB control), connection mobility control, radio admission control, measurement configuration and provision, dynamic resource allocation, etc. AMF can provide functions such as NAS security, idle state mobility processing, etc. UPF can provide functions such as mobility anchoring, PDU processing, etc. SMF can provide functions such as UE IP address assignment, PDU session control, etc.

[0073] Figure 6 An example of a frame structure that can be applied in NR is illustrated.

[0074] refer to Figure 6 , a radio frame (hereinafter may be referred to as a frame) may be used for uplink and downlink transmission in NR. A frame has a length of 10ms and may be defined as two half frames (half frames, HF) of 5ms. A half frame may be defined as five subframes (subframes, SF) of 1ms. A subframe may be divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Each time slot includes 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP). When a normal CP is used, each time slot includes 14 symbols. When an extended CP is used, each time slot includes 12 symbols. Here, a symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or DFT-s-OFDM symbol).

[0075] The following Table 1 illustrates subcarrier spacing configuration μ.

[0076] [Table 1]

[0077]

[0078] Table 2 below illustrates the number of time slots (N) in a frame according to the subcarrier spacing configuration μ. frame,μ slot ), the number of time slots in a subframe (N subframe,μ slot ), the number of symbols in the time slot (N slot symb )wait.

[0079] [Table 2]

[0080]

[0081] exist Figure 6 , μ=0, 1, 2, and 3 are exemplified.

[0082] The following Table 2-1 illustrates that when the extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to SCS (μ=2, 60 kHz).

[0083] [Table 2-1]

[0084] μ <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot <!-- 6 -->]]> 2 12 40 4

[0085] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) may be configured differently between multiple cells integrated into one UE. Therefore, the (absolute time) duration of a time resource (e.g., SF, time slot, or TTI) configured by the same number of symbols (collectively referred to as a time unit (TU) for convenience) may be configured differently between the integrated cells.

[0086] Figure 7 The figure shows the time slot structure of the NR frame.

[0087] A time slot includes multiple symbols in the time domain. For example, in the case of a normal CP, a time slot may include 7 symbols. However, in the case of an extended CP, a time slot may include 6 symbols. A carrier may include multiple subcarriers in the frequency domain. A resource block (RB) may be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of consecutive (P)RBs in the frequency domain and may correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., 5) BWPs. Data communication is performed through an activated BWP, and only one BWP can be activated for a UE. Each element in a resource grid is called a resource element (RE), and a complex symbol may be mapped to it.

[0088] The physical downlink control channel (PDCCH) may include one or more control channel elements (CCEs), as illustrated in Table 3 below.

[0089] [Table 3]

[0090] Aggregation level Number of CCEs 1 1 2 2 4 4 8 8 16 16

[0091] That is, the PDCCH may be transmitted through resources including 1, 2, 4, 8 or 16 CCEs. Here, the CCE includes six resource element groups (REGs), and one REG includes one resource block in the frequency domain and one orthogonal frequency division multiplexing (OFDM) symbol in the time domain.

[0092] Monitoring means decoding each PDCCH candidate according to the downlink control information (DCI) format. The UE monitors a set of PDCCH candidates in one or more CORESETs (described below) on the activated DL BWP of each activated serving cell, where PDCCH monitoring is configured for each activated serving cell according to the corresponding search space set.

[0093] A new unit called Control Resource Set (CORESET) may be introduced in NR. A UE may receive PDCCH in a CORESET.

[0094] Figure 8 Figure CORESET.

[0095] refer to Figure 8 , CORESET includes N in the frequency domain CORESET RB resource blocks and N in the time domain CORESET symb ∈{1, 2, 3} number of symbols. Figure 8 An example is shown in which CORESET consists of two symbols in the time domain. N may be provided by the base station through higher layer signaling. CORESET RB and N CORESET symb A CORESET may include multiple CCEs (or REGs). One CCE may consist of multiple resource element groups (REGs), and one REG may include one OFDM symbol in the time domain and 12 resource elements in the frequency domain.

[0096] The UE may attempt to detect the PDCCH in units of 1, 2, 4, 8, or 16 CCEs in a CORESET. One or more CCEs in which PDCCH detection may be attempted may be referred to as PDCCH candidates.

[0097] Multiple CORESETs can be configured for a UE.

[0098] The control region in a conventional wireless communication system (e.g., LTE / LTE-A) is configured on the entire system frequency band used by a base station (BS). All UEs except some that only support narrowband (e.g., eMTC / NB-IoT UEs) must be able to receive wireless signals of the entire system frequency band of the BS in order to properly receive / decode control information sent by the BS.

[0099] On the other hand, in NR, the above-mentioned CORESET is introduced. CORESET is a radio resource for control information to be received by UE, and only a portion may be used instead of the entire system bandwidth in the frequency domain. In addition, in the time domain, only some symbols in the time slot may be used. The BS can allocate a CORESET to each UE, and control information can be sent through the allocated CORESET. For example, a first CORESET may be allocated to UE 1, a second CORESET may be allocated to UE 2, and a third CORESET may be allocated to UE 3. In NR, the UE can receive control information from the BS without having to receive the entire system frequency band.

[0100] The CORESET may include a UE-specific CORESET for transmitting UE-specific control information and a common CORESET for transmitting control information common to all UEs.

[0101] Meanwhile, NR may require high reliability depending on the application. In this case, a target block error rate (BLER) of downlink control information (DCI) transmitted through a downlink control channel (e.g., a physical downlink control channel (PDCCH)) can be significantly reduced compared to those of conventional technologies. As an example of a method for satisfying the requirement for high reliability, it is possible to reduce the content included in the DCI and / or increase the amount of resources used for DCI transmission. Here, the resources may include at least one of resources in the time domain, resources in the frequency domain, resources in the code domain, and resources in the space domain.

[0102] In NR, the following technologies / features can be applied.

[0103] <Self-contained subframe structure>

[0104] In NR, in order to minimize delay, a structure in which a control channel and a data channel are time-division multiplexed (TDM) within one TTI can be considered as a frame structure. This structure is characterized in that DL transmission and UL transmission are performed sequentially within one subframe (or time slot, the same hereinafter), and thus DL data can be sent and UL ACK / NACK can be received within the subframe. Therefore, the time required from the occurrence of a data transmission error to data retransmission is reduced, thereby minimizing the delay in the final data transmission.

[0105] In this subframe structure where data and control are TMD, a time gap may be needed for the base station and the terminal to switch from the transmission mode to the reception mode or from the reception mode to the transmission mode. To this end, some OFDM symbols when DL switches to UL can be set as a guard period (GP) in a self-contained subframe structure.

[0106] Fig. 9 Figure 1 shows the structure of a self-contained time slot.

[0107] In the NR system, one time slot includes all of the DL control channel, DL or UL data channel, UL control channel, etc. For example, the first N symbols in the time slot can be used to send the DL control channel (hereinafter, the DL control region), and the last M symbols in the time slot can be used to send the UL control channel (hereinafter, the UL control region). N and M are both integers of 0 or greater. The resource region (hereinafter, the data region) located between the DL and UL control regions can be used for the transmission of DL data or UL data. As an example, one time slot can correspond to one of the following configurations. Each time period is listed in chronological order.

[0108] 1. DL configuration only

[0109] 2. UL configuration only

[0110] 3. Hybrid UL-DL configuration

[0111] -DL area + GP (guard period) + UL control area

[0112] -DL control area + GP + UL area

[0113] DL area: (i) DL data area, (ii) DL control area + DL data area,

[0114] UL area: (i) UL data area, (ii) UL data area + UL control area

[0115] PDCCH may be transmitted in the DL control region, and PDSCH may be transmitted in the DL data region. In the UL control region, PUCCH may be transmitted, and in the UL data region, PUSCH may be transmitted. In the PDCCH, downlink control information (DCI) such as DL data scheduling information or UL data scheduling information may be transmitted. In the PUCCH, uplink control information (UCI) such as ACK / NACK (positive acknowledgement / negative acknowledgement) information, channel state information (CSI) information, or scheduling request (SR) regarding DL data may be transmitted. GP provides a time gap during the process of the gNB and UE transitioning from a transmission mode to a reception mode or the process of the gNB and UE transitioning from a reception mode to a transmission mode. Part of the symbols belonging to the timing of the mode change from DL to UL within a subframe may be configured as GP.

[0116] <Analog Beamforming #1>

[0117] The wavelength is shortened in millimeter waves (mmW), and therefore a large number of antenna elements can be installed in the same area. That is, the wavelength is 1 cm at 30 GHz, and therefore in a 5×5 cm panel, a total of 100 antenna elements can be installed in a two-dimensional array at intervals of 0.5λ (wavelength). Therefore, a large number of antenna elements can be used in mmW to increase beamforming (BF) gain to increase coverage or improve throughput.

[0118] In this case, if a transceiver unit (TXRU) is provided to adjust the transmission power and phase of each antenna element, independent beamforming for each frequency resource can be performed. However, installing a TXRU for all approximately 100 antenna elements reduces efficiency in terms of cost. Therefore, a method of mapping a large number of antenna elements to one TXRU and using an analog phase shifter to control the beam direction is considered. This analog beamforming is able to form only one beam direction in all frequency bands, and therefore cannot provide frequency selective beamforming.

[0119] Hybrid beamforming (BF) with B TXRUs smaller than Q antenna elements can be considered as an intermediate form of digital BF and analog BF. In this case, the number of directions of beams that can be transmitted simultaneously is limited to B, although it depends on the method of connecting the B TXRUs and the Q antenna elements.

[0120] <Analog Beamforming #2>

[0121] When multiple antennas are used in NR, hybrid beamforming, which is a combination of digital beamforming and analog beamforming, appears. Here, in analog beamforming (or RF beamforming), the RF end performs precoding (or combining), and is therefore able to achieve performance similar to that of digital beamforming while reducing the number of RF chains and the number of D / A (or A / D) converters. For convenience, the hybrid beamforming structure can be represented by N TXRUs and M physical antennas. Then, the digital beamforming for the L data layers to be sent at the transmitting end can be represented by an N by L matrix, and the converted N digital signals are converted into analog signals via the TXRU, and analog beamforming represented by an M by N matrix is ​​applied.

[0122] It is possible to transmit system information of the NR system in a broadcast manner. In this case, in one symbol, analog beams belonging to different antenna panels can be transmitted simultaneously. A scheme of introducing a beam RS (BRS), which is a reference signal (RS) transmitted by applying a single analog beam (corresponding to a specific antenna panel), is being discussed to measure the channel of each analog beam. BRS can be defined for multiple antenna ports, and each antenna port of the BRS can correspond to a single analog beam. In this case, unlike BRS, a synchronization signal or xPBCH can be transmitted by applying all analog beams within the analog beam group so as to be correctly received by any UE.

[0123] In NR, in the time domain, a synchronization signal block (SSB, or also referred to as a synchronization signal and physical broadcast channel (SS / PBCH)) may include 4 OFDM symbols indexed in ascending order from 0 to 3 within the synchronization signal block, and a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH associated with a demodulation reference signal (DMRS) may be mapped to these symbols. As described above, a synchronization signal block may also be represented by a SS / PBCH block.

[0124] In NR, since multiple synchronization signal blocks (SSBs) can be sent at different times, and SSBs can be used to perform initial access (IA), serving cell measurement, etc., when the transmission time and resources of SSBs overlap with the transmission time and resources of other signals, it is preferred to send SSBs first. For this purpose, the network can broadcast the transmission time and resource information of SSBs, or indicate them through UE-specific RRC signaling.

[0125] In NR, transmission and reception can be performed based on beams. If the reception performance of the current serving beam deteriorates, a process of searching for a new beam through the so-called beam failure recovery (BFR) can be performed.

[0126] Since the BFR procedure is not intended to declare an error or failure of the link between the network and the UE, it can be assumed that the connection with the current serving cell is retained even if the BFR procedure is performed. During the BFR procedure, measurements of different beams configured by the network (which can be represented according to CSI-RS ports or synchronization signal block (SSB) indexes) can be performed, and the best beam for the corresponding UE can be selected. The UE can perform the BFR procedure in such a way that it performs the RACH procedure associated with the beam that produces good measurement results.

[0127] Now, a transmission configuration indicator (hereinafter, referred to as TCI) state will be described. The TCI state may be configured for each CORESET of a control channel, and a parameter for determining an RX beam of a UE may be determined based on the TCI state.

[0128] For each DL BWP of the serving cell, the UE may be configured for three or fewer CORESETs. In addition, the UE may receive the following information for each CORESET.

[0129] 1) a CORESET index p (e.g., one of 0 to 11, where the index of each CORESET can be uniquely determined between the BWPs of one serving cell),

[0130] 2) PDCCH DM-RS scrambling sequence initialization value,

[0131] 3) the duration of the CORESET in the time domain (which can be given in symbols),

[0132] 4) Resource block collection,

[0133] 5) CCE-to-REG mapping parameters,

[0134] 6) Antenna port quasi co-location (from the antenna port quasi co-location set provided by a higher layer parameter called "TCI-State"), indicating the quasi co-location (QCL) information of the DM-RS antenna ports used to receive PDCCH in each CORESET,

[0135] 7) An indication of the presence of a Transmission Configuration Indication (TCI) field for a specific DCI format sent by the PDCCH in the CORESET, etc.

[0136] QCL will be described. If the characteristics of the channel through which symbols on one antenna port are transmitted can be inferred from the characteristics of the channel through which symbols on the other antenna port are transmitted, the two antenna ports are considered to be quasi-co-located (QCLed). For example, when two signals A and B are transmitted from the same transmit antenna array to which the same / similar spatial filters are applied, the two signals may experience the same / similar channel states. From the perspective of the receiver, when one of the two signals is received, the other signal can be detected by using the channel characteristics of the received signal.

[0137] In this sense, when signals A and B are considered to be quasi-co-located (QCLed), this may mean that signals A and B experience similar channel conditions, and therefore the channel information estimated to detect signal A is also useful for detecting signal B. In this context, channel conditions may be defined according to, for example, Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameters, etc.

[0138] The "TCI-State" parameter associates one or two downlink reference signals with the corresponding QCL type (QCL types A, B, C and D, see Table 4).

[0139] [Table 4]

[0140] QCL Type describe QCL-TypeA Doppler shift, Doppler spread, average delay, delay spread QCL-TypeB Doppler shift, Doppler spread QCL-TypeC Doppler shift, average delay QCL-TypeD Space Rx parameters

[0141] Each "TCI-State" may include parameters for configuring a QCL relationship between one or two downlink reference signals and a DM-RS port of a PDSCH (or PDDCH) or a CSI-RS port of a CSI-RS resource.

[0142] Meanwhile, for each DL BWP of the UE configured in one serving cell, the UE may be equipped with 10 (or less) search space sets. For each search space set, at least one of the following information may be equipped to the UE.

[0143] 1) Search space set index s (0≤s<40), 2) Association between CORESET p and search space set s, 3) PDCCH monitoring periodicity and PDCCH monitoring offset (time slot unit), 4) PDCCH monitoring pattern within a time slot (e.g., indicating the first symbol of the CORESET in the time slot used for PDCCH monitoring), 5) The number of time slots in which search space set s exists, 6) The number of PDCCH candidates for each CCE aggregation level, 7) Information indicating whether search space set s is CSS or USS.

[0144] In NR, CORESET#0 may be configured through PBCH (or UE-specific signaling or PSCell configuration or BWP configuration for handover). Search Space (SS) Set #0 configured by PBCH may have a different monitoring offset (e.g., slot offset, symbol offset) for each associated SSB. This may be required to minimize the search space opportunities to be monitored by the UE. Alternatively, this may be required to provide a beam scanning control / data region capable of performing control / data transmission on a per-beam basis, so that communication with the UE is continuously performed while the UE's best beam changes dynamically.

[0145] Meanwhile, in a wireless communication system, a UE receives information from a BS through a downlink (DL), and the UE transmits information to the BS through an uplink (UL). The information transmitted / received by the BS and the UE includes data and various control information, and there are various physical channels according to the type / purpose of the information transmitted / received by the BS and the UE.

[0146] The UE that is powered on again in a power-off state or newly enters a cell performs an initial cell search operation, such as adjusting synchronization with the BS, etc. (S11). To this end, the UE receives a primary synchronization channel (PSCH) and a secondary synchronization channel (SSCH) from the BS to adjust synchronization with the BS, and obtains information such as a cell identification (ID), etc. In addition, the UE may receive a physical broadcast channel (PBCH) from the BS to obtain broadcast information in the cell. In addition, the UE may receive a downlink reference signal (DL RS) in the initial cell search step to identify the downlink channel state.

[0147] When the initial cell search is completed, the UE may receive a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) corresponding thereto to acquire more specific system information.

[0148] Thereafter, the UE may perform a random access procedure to complete access to the BS. Specifically, the UE may send a preamble through a physical random access channel (PRACH), and may receive a random access response (RAR) for the preamble through a PDCCH and a PDSCH corresponding thereto. Thereafter, the UE may send a physical uplink shared channel (PUSCH) by using the scheduling information in the RAR, and may perform a contention resolution procedure similar to that of the PDCCH and the PDSCH corresponding thereto.

[0149] After performing the above process, as a typical uplink / downlink signal transmission process, the UE can perform PDCCH / PDSCH reception and PUSCH / physical uplink control channel (PUCCH) transmission. The control information sent by the UE to the BS is called uplink control information (UCI). UCI includes hybrid automatic repeat request (HARQ) acknowledgment (ACK) / negative ACK (NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI), rank indication (RI), etc. Typically, UCI is sent via PUCCH. However, when control information and data are to be sent simultaneously, UCI can be sent via PUSCH. In addition, the UE can send UCI aperiodically via PUSCH according to the request / instruction of the network.

[0150] Fig.10 An example of downlink transmission / reception operation is shown.

[0151] refer to Fig.10 , the base station schedules downlink transmission such as frequency / time resources, transmission layer, downlink precoder, MCS, etc. (S1401). In particular, the base station can determine the beam used to transmit PDSCH to the UE through the above-mentioned beam management operation. And, the UE receives downlink control information (DCI) (i.e., including scheduling information for PDSCH) from the base station on the PDCCH for downlink scheduling (S1402). DCI format 1_0 or 1_1 can be used for downlink scheduling. Specifically, DCI format 1_1 may include the following information: DCI format identifier (identifier for DCI format), bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, PRB bundling size indicator, rate matching indicator, ZP CSI-RS trigger, antenna port, transmission configuration indication (TCI), SRS request, DMRS (demodulation reference signal) sequence initialization.

[0152] Specifically, according to each state indicated in the antenna port field, the number of DMRS ports can be scheduled, and single user (SU) / multi-user (MU) transmission scheduling is possible. In addition, the TCI field consists of 3 bits, and the QCL for DMRS is dynamically indicated by indicating up to 8 TCI states according to the TCI field value. And, the UE receives downlink data from the base station on the PDSCH (S1403). If the UE detects a PDCCH including DCI format 1_0 or 1_1, it decodes the PDSCH according to the indication of the corresponding DCI.

[0153] Here, when the UE receives a PDSCH scheduled by DCI format 1, the UE may be configured with a DMRS configuration type through a higher layer parameter "dmrs-Type", and the DMRS type is used to receive the PDSCH. In addition, the UE may be configured with a maximum number of front-end DMRS symbols for PDSCH through a higher layer parameter "maxLength".

[0154] In the case of DMRS configuration type 1, when a single codeword is scheduled to a UE and specifies an antenna port mapped with an index {2, 9, 10, 11, or 30}, or two codewords are scheduled to a UE, the UE assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE. Alternatively, in the case of DMRS configuration type 2, when a single codeword is scheduled to a UE and specifies an antenna port mapped with an index {2, 10, or 23}, or two codewords are scheduled to a UE, the UE assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE.

[0155] When the UE receives the PDSCH, it can be assumed that the precoding granularity P' is a continuous resource block in the frequency domain. Here, P' can correspond to one of {2, 4, broadband}. If P' is determined to be broadband, the UE does not expect to use non-contiguous PRBs for scheduling, and the UE can assume that the same precoding is applied to the allocated resources. On the other hand, when P' is determined to be any one of {2, 4}, the precoded resource block group (PRG) is divided into P'contiguous PRBs. The actual number of consecutive PRBs in each PRG can be one or more. The UE can assume that the same precoding is applied to consecutive downlink PRBs in the PRG.

[0156] To determine the modulation order, target code rate, and transport block size in PDSCH, the UE first reads the 5-bit MCD field in the DCI and determines the modulation order and target code rate. Also, the UE reads the redundancy version field in the DCI and determines the redundancy version. Also, the UE determines the transport block size by using the number of layers before rate matching and the total number of allocated PRBs.

[0157] Fig.11 An example of uplink transmission / reception operation is shown.

[0158] refer to Fig.11, the base station schedules uplink transmission such as frequency / time resources, transmission layer, uplink precoder, MCS, etc. (S1501). In particular, the base station is able to determine the beam used by the UE for PUSCH transmission through the above-mentioned beam management operation. And, the UE receives DCI for uplink scheduling (i.e., including scheduling information of PUSCH) from the base station on the PDCCH (S1502). DCI format 0_0 or 0_1 can be used for uplink scheduling, and specifically, DCI format 0_1 ​​may include the following information: DCI format identifier (indicator for DCI format), UL / SUL (supplementary uplink) indicator (UL / SUL indicator), bandwidth part indicator, frequency domain resource assignment, time domain resource assignment, frequency hopping flag, modulation and coding scheme (MCS), SRS resource indicator (SRI), precoding information and number of layers, antenna port, SRS request, DMRS sequence initialization, UL-SCH (uplink shared channel) indicator (UL-SCH indicator).

[0159] Specifically, the SRS resources configured in the SRS resource set associated with the higher layer parameter "usage" may be indicated by the SRS resource indicator field. In addition, "spatialRelationInfo" may be set for each SRS resource, and the value may be one of {CRI, SSB, SRI}.

[0160] Then, the UE sends uplink data to the base station on the PUSCH (S1503). When the UE detects a PDCCH including DCI format 0_0 or 0_1, it sends the corresponding PUSCH according to the indication by the corresponding DCI. Two transmission schemes can be supported for PUSCH transmission, such as codebook-based transmission and non-codebook-based transmission.

[0161] In the case of codebook based transmission, when the higher layer parameter "txConfig" is set to "codebook", the UE is set to codebook based transmission. On the other hand, when the higher layer parameter "txConfig" is set to "nonCodebook", the UE is configured for non-codebook based transmission. If the higher layer parameter "txConfig" is not set, the UE does not expect to be scheduled by DCI format 0_1. When PUSCH is scheduled by DCI format 0_0, PUSCH transmission is based on a single antenna port. In the case of codebook based transmission, PUSCH can be scheduled by DCI format 0_0, DCI format 0_1 ​​or semi-statically scheduled. When this PUSCH is scheduled by DCI format 0_1 ​​as given by the SRS resource indicator field, as well as precoding information and layer number fields, the PUSCH transmission precoder is determined based on the SRI, TPMI (transmission precoding matrix indicator) and transmission rank from the DCI. TPMI is used to indicate the precoder applied across antenna ports and corresponds to the SRS resource selected by SRI when multiple SRS resources are configured. Alternatively, when a single SRS resource is configured, the TPMI is used to indicate the precoder applied across antenna ports and corresponds to a single SRS resource. The transmit precoder is selected from an uplink codebook with the same number of antenna ports as the higher layer parameter "nrofSRS-Ports". When the higher layer setting is set to "codebook" by the parameter "txConfig", the UE is configured with at least one SRS resource. The SRI indicated in time slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS resource precedes the PDCCH carrying the SRI (i.e., time slot n).

[0162] For non-codebook based transmissions, PUSCH can be scheduled via DCI format 0_0, DCI format 0_1, or semi-static scheduling. When multiple SRS resources are configured, the UE can determine the PUSCH precoder and transmission rank based on the wideband SRI. Here, the SRI is given by the SRS resource indicator in the DCI or the higher layer parameter "srs-ResourceIndicator". The UE uses one or more SRS resources for SRS transmission. Here, the number of SRS resources can be configured for simultaneous transmission in the same RB based on the UE capabilities. Only one SRS port is configured for each SRS resource. The higher layer parameter "usage" set to "nonCodebook" can only configure one SRS resource. The maximum number of SRS resources that can be configured for non-codebook based uplink transmission is 4. The SRI indicated in time slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS transmission precedes the PDCCH carrying the SRI (i.e., time slot n).

[0163] In the case of NR, uplink grants can be divided into (1) dynamic grants (or with grants) and (2) configured grants (or without grants or without grants).

[0164] Fig.12 An example of an uplink grant is shown.

[0165] Specifically, Fig.12 (a) shows an example of dynamic licensing, and Fig.12 (b) shows an example of configuration permission.

[0166] Dynamic grant refers to a scheduling-based data transmission / reception method of a base station in order to maximize resource utilization. This means that when there is data to be sent, the UE first requests uplink resource allocation from the base station, and can send data using only the uplink resources allocated from the base station. In order to use uplink radio resources efficiently, for each UE, the base station needs to know what type and how much data to send in the uplink. Therefore, the UE directly sends information about the uplink data to the base station, and the base station can allocate uplink resources to the corresponding UE based on the information. In this case, the information about the uplink data sent from the UE to the base station is the amount of uplink data stored in its buffer, and is called a buffer status report (BSR). When the UE is allocated resources on the PUSCH in the current TTI and a reporting event is triggered, the BSR is sent using a MAC control element.

[0167] refer to Fig.12 (a) illustrates an uplink resource allocation process for actual data when uplink radio resources for buffer status report (BSR) are not allocated to UE. That is, in the case where the UE changes state from DRX mode to active mode, since there are no pre-allocated data resources, it is necessary to start requesting resources for uplink data with SR transmission through PUCCH, and in this case, a 5-step uplink resource allocation process is used.

[0168] refer to Fig.12(a), in the case where no PUSCH resources are allocated to the UE for sending a BSR, the UE first sends a scheduling request (SR) to the eNB in ​​order to be allocated PUSCH resources. When a reporting event occurs but the UE is not scheduled with radio resources on the PUSCH in the current TTI, the scheduling request is used to request the base station to receive the PUSCH resources for uplink transmission of the UE. That is, when a regular buffer status report (regular BSR) is triggered but the UE does not have uplink radio resources for sending the BSR to the base station, the SR is sent on the PUCCH. Depending on whether the PUCCH resources for the SR are configured, the UE sends the SR through the PUCCH or initiates a random access procedure. Specifically, the PUCCH resources through which the SR can be sent are configured by a UE-specific higher layer (e.g., the RRC layer), and the SR configuration includes the SR transmission period (SR periodicity) and the SR subframe offset information. When a UL grant for the PUSCH resources for BSR transmission is received from the base station, the UE sends the triggered BSR to the base station through the PUSCH resources allocated by the UL grant. The base station checks the amount of data actually sent by the UE in the uplink through the BSR, and sends a UL grant of PUSCH resources for actual data transmission to the UE. Upon receiving the UL grant for actual data transmission, the UE sends the actual uplink data to the base station through the allocated PUSCH resources.

[0169] refer to Fig.12 (b), the configured licensing method will be described.

[0170] The UE receives a resource configuration for transmitting UL data without permission from the base station. The resource configuration may be performed only by RRC signaling (type 1), or may be performed by L1 (layer 1) signaling and RRC signaling (type 2). And, the UE performs initial transmission to the base station based on the resource configuration received without permission. In this case, the initial transmission may be repeated, and the initial transmission for the same transport block may be repeated K times (K≥1).

[0171] The resources used for initial transmission via a configured grant may or may not be shared among one or more UEs.

[0172] When the initial transmission fails with the configured grant, the base station can send a grant to the UE for retransmitting the TB related to the initial transmission. At this time, even if a conflict occurs, the base station needs to identify the UE. The UE that performs UL transmission without UL grant can be identified based on time / frequency resources and reference signal (RS) parameters.

[0173] The base station can allocate different DMRS resources to different UEs sharing the same PUSCH resources. And, when the UE performs retransmission, it is switched to transmission based on the grant, the UE receives the grant from the base station, and performs retransmission based on the grant. That is, the UE performs initial transmission without a grant, but performs retransmission based on the grant.

[0174] Fig.13 An example of a permissionless initial transmission is shown.

[0175] refer to Fig.13 , the initial transmission can be performed with a period P. The initial transmission may be a permission-free transmission, and the subsequent repeated transmissions may be permission-based transmissions.

[0176] In order to achieve reasonable battery consumption when bandwidth adaptation (BA) is configured, in an active serving cell, only one uplink BWP and one downlink BWP or only one downlink / uplink BWP pair for each uplink carrier may be activated at a time, and all other BWPs configured in the UE are deactivated. In a deactivated BWP, the UE does not monitor the PDCCH and does not perform transmissions on the PUCCH, PRACH and UL-SCH.

[0177] For BA, the RX and TX bandwidths of the UE are not necessarily as wide as the bandwidth of the cell and can be adjusted. That is, the width can be commanded to change (e.g., to reduce during periods of low activity to save power), the position in the frequency domain can be moved (e.g., to increase scheduling flexibility), and the subcarrier spacing can be changed (e.g., to allow different services). A subset of the entire cell bandwidth of a cell is called a bandwidth part (BWP), and BA is obtained by configuring a BWP to the UE and notifying the UE of the currently active BWP among the configured BWPs. When BA is configured, the UE only needs to monitor the PDCCH on one active BWP. That is, there is no need to monitor the PDCCH on the entire downlink frequency of the cell. The BWP inactivity timer (independent of the aforementioned DRX inactivity timer) is used to switch the active BWP to the default BWP. That is, the timer is restarted when the PDCCH decoding is successful, and switches to the default BWP when the timer expires.

[0178] Hereinafter, the present disclosure proposes a cross-slot scheduling method in a wireless communication system and a device using the method.

[0179] In NR, a power saving technology is being discussed to reduce the power consumption of UE, and among these technologies, there is a power saving technology using cross-slot scheduling.

[0180] The power saving technique using cross-slot scheduling indicates the minimum slot offset between the DCI and the PDSCH scheduled in the DCI. Power consumption can be reduced by a method in which the UE (micro) sleeps for a duration guaranteed by the minimum slot offset or applies PDCCH decoding relaxation (e.g., using low voltage / low clock speed). For example, assume that the minimum slot offset is 2. In this case, if the UE receives DCI in slot #N, the UE sleeps in slot #N+1 and wakes up in slot #N+2 to receive the PDSCH scheduled by the DCI. Because the minimum slot offset is 2, it is possible to sleep in slot #N+1. The minimum slot offset may be referred to as the minimum applicable slot offset or the minimum applicable offset, the minimum scheduling offset, etc.

[0181] As a specific example, when scheduling PDSCH or PUSCH, the network may set the minimum applicable K0 / K2 value to indicate to the UE the minimum time slot offset between the DCI and the corresponding scheduled PDSCH / PUSCH. Here, K0 may be an offset (time slot offset) related to the time relationship between the time slot for receiving DCI and the time slot for receiving PDSCH scheduled by DCI. K0 may be based on a parameter set for PDSCH. K2 may be an offset (time slot offset) related to the time relationship between the time slot for receiving DCI and the time slot for sending PUSCH scheduled by DCI. K2 may be based on a parameter set for PUSCH. It can be seen that the minimum applicable K0 indicates the minimum applicable value (restriction) in setting the K0 value, and the minimum applicable K2 indicates the minimum applicable value (restriction) in setting the K2 value. Below, the minimum applicable K0 may be expressed as K0min, and the minimum applicable K2 may be expressed as K2min.

[0182] For example, the base station may indicate K0 and K2 to the UE in the following manner.

[0183] When a UE is scheduled to receive PDSCH via DCI, the time domain resource assignment field value m of the DCI provides a row index m+1 in the resource allocation table. The index row directly defines the slot offset K0, the start and length indicator SLIV or the start symbol S and the allocation length L, and the PDSCH mapping type assumed in PDSCH reception.

[0184] The following table is an example of a resource allocation table.

[0185] [Table 5]

[0186]

[0187] Given the parameter value of the index row, the time slot allocated to PDSCH is floor(n·(2 μPDSCH / 2 μPDCCH))+K0. Here, n is the time slot with scheduled DCI, and K0 is based on the parameter set of PDSCH. PDSCH and μ PDCCH Each of is a subcarrier spacing configuration for each of PDSCH and PDCCH.

[0188] The start symbol S for the start of a slot and L (the number of symbols allocated to the PDSCH) which is the number of consecutive symbols counted from the symbol S are determined from the “start and length indicator” SLIV.

[0189] When the UE is scheduled to send a transport block but no CSI report, or when the UE is scheduled by DCI to send a transport block and CSI report in PUSCH, the time domain resource assignment field value m of the DCI provides a row index m+1 in the allocated table. The index row directly defines the slot offset K2, the start and length indicator SLIV or the start symbol S and the allocation length L, and the PUSCH mapping type to be applied to the PUSCH transmission.

[0190] The time slot in which the UE should send the PUSCH can be determined by K2 as floor(n·(2 μPUSCH / 2 μPDCCH ))+K2. Here, n is the time slot with scheduled DCI, and K2 is based on the parameter set of PUSCH. PUSCH and μ PDCCH The subcarrier spacing configurations used for PUSCH and PDCCH respectively.

[0191] The start symbol S for the start of a slot (relative to the start of the slot) and L, the number of consecutive symbols allocated to the PUSCH counted from the symbol S, are determined from the start of the index line and the length indicator SLIV.

[0192] On the other hand, in the case of indicating / changing the minimum applicable K0 / K2 (K0min / K2min), when to apply the corresponding indication / change can be determined by "application delay", and the application delay can be defined as follows. In the following, for convenience, the application delay can be expressed as X or application delay X.

[0193] To make the application delay X applicable for the minimum applicable K0 / K2 value indicated by the scheduled cell triggered by a 1-bit indication of DCI format 1_1 or 0_1 in the scheduling cell,

[0194] The UE receives a DCI indicating a change in the minimum applicable K0 / K2 value in time slot n of the scheduling cell,

[0195] The UE may assume that a new minimum applicable K0 / K2 value is applied to the PDSCH / PUSCH of the scheduled cell from the time slot (n+X) of the scheduling cell. That is, when a DCI indicating a change in the minimum applicable K0 / K2 value is received in the time slot n of the scheduling cell, the changed minimum applicable K0 / K2 value is applied from the time slot n+X of the scheduling cell.

[0196] In the case of self-carrier scheduling and at least PDCCH monitoring case 1-1 (to be described later), X=max(Y,Z). Here, Y is the active minimum applicable K0 value of the active DL BWP before the change indication, and Z is (1, 1, 2, 2) for each downlink subcarrier spacing (DL SCS) (15, 30, 60, 120) kHz respectively.

[0197] In the above definition, Z may be defined as "the minimum feasible non-zero application delay that may depend on the DL SCS" and may be interpreted as the minimum time for PDCCH decoding.

[0198] The Z value is applied when Y is 0 or less than Z. In this case, the new minimum applicable value K0 / K2 (K0min / K2min) may mean applying it from a time point when the UE recognizes the corresponding value (ie, a time when PDCCH decoding ends).

[0199] Fig.14 is an example of applying an application delay.

[0200] refer to Fig.14 (a), the UE receives DCI in slot m and receives PDSCH scheduled by DCI in slot m+K0. In this case, for example, it is assumed that the K0min value as the minimum applicable slot offset is 1 and the K0 value is 2. Then, the UE can receive DCI including information indicating the change of the minimum applicable slot offset in slot n. By this, for example, it is assumed that the value of K0min is changed to 0. In this case, the change of the minimum applicable slot offset is applied from slot n+X instead of from slot n. The value of X can be determined as the maximum value between Y and Z, such as max(Y,Z). Here, Y is the active minimum applicable K0 value of the active DL BWP before the change indication, and Z can be (1, 1, 2, 2) for the case where the DL SCS is (15, 30, 60, 120) kHz. In slot n+X, the UE can receive DCI indicating 0 as the value of K0, and can also receive PDSCH scheduled by DCI.

[0201] refer to Fig.14(b), the UE may receive DCI #1 in slot n including information indicating a change in the minimum applicable slot offset. In this case, the changed minimum applicable slot offset (let's call it K0minNew) is applied from slot n+X instead of directly from slot n. That is, the DCI #2 received in slot n+X indicates a K0 value greater than or equal to K0minNew. From the UE's point of view, from slot n+X onwards, it is expected to receive DCI indicating a K0 value greater than or equal to K0minNew. Until slot n+X, the existing minimum applicable slot offset (let's call this K0minOld) is applied.

[0202] PDCCH monitoring case 1-1, case 1-2, and case 2 may be defined as follows.

[0203] Case 1: The case where the PDCCH monitoring period is 14 symbols or more.

[0204] Case 1-1: A case where PDCCH monitoring is performed on up to 3 OFDM symbols from the beginning of a slot.

[0205] Case 1-2: The case where PDCCH monitoring is performed on any up to 3 consecutive OFDM symbols of a slot.

[0206] For a given UE, all search space configurations are within the same range of three consecutive OFDM symbols in a slot.

[0207] Case 2: Case where the PDCCH monitoring period is less than 14 symbols. This involves monitoring the PDCCH on up to 3 OFDM symbols from the beginning of the slot.

[0208] The present disclosure proposes a method to define "application delay" and cross-carrier scheduling in each case.

[0209] <Application Delay>

[0210] Fig.15 The figure shows the location of the CORESET used for PDCCH monitoring.

[0211] refer to Fig.15 , the first CORESET 151 for PDCCH monitoring is located within the first three symbols of the time slot, and the second CORESET 152 for PDCCH monitoring is located outside the first three symbols of the time slot, for example, it can be located in the last three symbols of the time slot. It can be seen that the first CORESET 151 corresponds to the aforementioned cases 1-1 and 1-2, and the second CORESET 152 corresponds to the aforementioned case 1-2.

[0212] That is, in case 1-2, unlike case 1-1 (the CORESET for PDCCH monitoring is located within the first 3 symbols of the time slot), there is no position restriction in the time slot of the CORESET for monitoring PDCCH. Fig.15 As shown, the network can instruct the UE to locate the CORESET in the last 3 symbols in the slot and monitor the PDCCH. This means that the PDCCH decoding end time (i.e., the DCI decoding end time) may be different depending on the location of the CORESET. This should be taken into account in determining the application delay X value for indicating the change of the minimum applicable value K0 / K2 (K0min / K2min) through DCI and determining the application timing.

[0213] For example, when Y=0, Z=1, this gives X=max(Y,Z)=1. This means that the changed minimum applicable value K0 / K2 (K0min / K2min) is applied to the time slot immediately following the indicated change. However, there may be situations where this is not possible.

[0214] For example, PDCCH decoding may end in the next slot. For example, if the CORESET for PDCCH monitoring is located in the last 3 symbols of the slot, the UE will receive the PDCCH in the last 3 symbols and then decode the PDCCH in the next slot. Therefore, the PDCCH decoding result may not be applied from the beginning of the next slot.

[0215] In order to solve such a problem, the present disclosure proposes the following method: A solution using a Z value is proposed below, but the same method can be applied to an X or Y value.

[0216] Option 1) can apply it by adding a specific value (eg, 1) to the predefined Z value.

[0217] Option 1 is the simplest solution, and in case 1-2, the application delay can be derived by adding a specific value (e.g., 1) to the value of Z. In this case, the specific value can be predefined or indicated by higher layer signaling of the network (e.g., RRC, MAC CE, etc.).

[0218] Option 2) Determine the Z value based on the position of the CORESET (group).

[0219] The UE may determine whether to add a specific value (e.g., 1) to the Z value according to the position of the CORESET to be monitored in the corresponding time slot. To this end, the position of the CORESET used as a reference may be defined in advance or may be indicated by higher layer signaling of the network. Alternatively, the reference position of the CORESET may be determined according to the decoding capability of the UE. In this case, the UE may report the decoding capability (e.g., the position of the CORESET capable of terminating PDCCH decoding in the corresponding time slot).

[0220] As the CORESET, all CORESETs monitored in the corresponding time slot may be considered, or it may be limitedly applied to the CORESETs in which the non-backoff DCI that may indicate the minimum applicable K0 / K2 is monitored.

[0221] For example, when all or part of a CORESET (in which PDCCH monitoring needs to be performed) exists after a specific symbol index (indicated in advance, or indicated by higher layer signaling of the network, or indicated by capabilities reported by the UE), the UE can derive the application delay by adding a specific value (e.g., 1) to the predefined Z value.

[0222] Option 3) Z value specific to case 1-2.

[0223] The network may separately indicate the Z value to be applied to case 1-2. Alternatively, the Z value for case 1-2 may be determined by a predefined definition. In addition, as in option 2, in option 3, it may be determined whether to apply the Z value for case 1-2 depending on the location of the CORESET.

[0224] Situation 2.

[0225] Case 2 refers to a case where a plurality of monitoring opportunities of a specific search space set are set (or can be set) in one time slot. In case 2, the following method can be considered.

[0226] Option 1) The method of not applying the power saving technique using cross-time slot scheduling to Case 2.

[0227] As described above, the power saving technique using cross-slot scheduling is a scheme for performing a power saving operation during a slot offset between a PDCCH and a scheduled PDSCH. However, in case 2, since one search space set can have multiple monitoring opportunities within one slot, it may be difficult to anticipate power saving due to sleep, etc. Therefore, in case 2, it can be assumed that a power saving operation by the minimum applicable K0 is not performed.

[0228] In addition, the PDCCH monitoring opportunity is determined by the search space set setting. When multiple search space sets are configured, different cases may be applied to each time slot. Therefore, when different cases are applied to each time slot, option 1 may be interpreted as suggesting that it is assumed that cross-time slot scheduling is not applied in the time slot corresponding to case 2 or that the minimum applicable value K0 / K2 is not changed in the time slot corresponding to case 2.

[0229] As another method, when the minimum applicable value K0 / K2 is re-indicated (ie, changed) by DCI transmitted in a slot corresponding to Case 2, the UE may ignore the indication. This method can be applied to Case 1-2 as well as Case 2.

[0230] Option 2) Apply a delay method for each monitoring opportunity

[0231] Since the application delay means the time when the minimum applicable value K0 / K2 of the re-indication is applied, it is also possible to consider a method of defining the application delay for each monitoring opportunity. Therefore, in case 2, the application delay can be applied for each monitoring opportunity, which may mean that the application delay derivation method applied to case 1-1 and case 1-2 is applied according to the position of the monitoring opportunity in the time slot.

[0232] <Cross-carrier scheduling>

[0233] Cross-carrier scheduling refers to a method of scheduling the PDSCH of a scheduled cell (the scheduled cell) in the PDCCH of the scheduling cell (the cell performing scheduling). That is, the PDCCH used for PDSCH scheduling is decoded in the scheduling cell (more specifically, the active DL BWP of the scheduling cell), and the scheduling of the PDSCH sent in the scheduled cell (more specifically, the active DL BWP of the scheduled cell) is performed through the corresponding DCI.

[0234] When the power saving technique using cross-slot scheduling is applied in a scheduled cell (active BWP), the application delay of the minimum applicable value K0 / K2 for the scheduled cell (active BWP) may be defined in the following method.

[0235] Option 1) Application delay based on scheduling cell (active BWP)

[0236] The application delay can be interpreted as an offset from the time slot in which the DCI indicating the new minimum applicable K0 / K2 is sent to the time slot to which the corresponding value is actually applied. This is closely related to PDCCH decoding. As described above, since cross-carrier scheduling is a process of scheduling the PDSCH of the scheduled cell through the PDCCH in the scheduling cell, it may be desirable to replace the application delay of the minimum applicable value K0 / K2 of the scheduled cell with the application delay of the scheduling cell (active BWP). Therefore, the present disclosure proposes to determine Y and / or Z as parameters for determining the application delay based on the scheduling cell.

[0237] For example, in cross-carrier scheduling, the application delay of the scheduled cell can be determined as follows. (Alternatively, it can be defined to follow the application delay of the scheduling cell.)

[0238] For application delay X for application of the minimum applicable K0 / K2 value indicated for the scheduled cell, the minimum applicable K0 / K2 value is triggered by a 1-bit indication of DCI format 1_1 or 0_1,

[0239] The UE receives a DCI indicating a change in time slot n of the scheduling cell.

[0240] The UE may be scheduled in the DCI in the time slot (n+X) of the scheduling cell with the minimum applicable K0 / K2 value for the PDSCH / PUSCH of the scheduled cell.

[0241] For cross-carrier scheduling, X=max(Y,Z). Here, Y is the active minimum applicable K0 value of the active DL BWP of the scheduling cell, and Z is (1, 1, 2, 2) for each downlink subcarrier spacing (DL SCS) (15, 30, 60, 120) kHz of the active BWP of the scheduling cell, respectively.

[0242] Option 2) Application delay based on scheduled cell (active BWP)

[0243] When the UE performs processing (e.g., PDCCH decoding) for the scheduling cell and the scheduled cell separately, the PDCCH that schedules the PDSCH of the scheduled cell is sent in the scheduling cell, but the application delay of the change of the minimum applicable value for the scheduled cell can be determined based on the scheduled cell. However, in this case, if the scheduling cell and the scheduled cell have different parameter sets, the process of scaling to fit the parameter set of the scheduling cell may be required. For example, in cross-carrier scheduling, the application delay of the scheduled cell can be determined as follows.

[0244] In the application delay X for applying the minimum applicable K0 / K2 value indicated for the scheduled cell triggered by a 1-bit indication of DCI format 1_1 or 0_1 in the scheduling cell,

[0245] The UE receives a DCI indicating a change in time slot n of the scheduling cell.

[0246] The UE may be scheduled in the DCI in the time slot (n+X) of the scheduling cell with the minimum applicable K0 / K2 value for the PDSCH / PUSCH of the scheduled cell.

[0247] For cross-carrier scheduling, X = max(Y, Z)·(2 μscheduling / 2 μscheduled ) or X = ceil(max(Y,Z)·(2 μscheduling / 2 μscheduled )). Here, Y is the active minimum applicable K0 value of the active DL BWP of the scheduled cell before the change indication. For each downlink subcarrier spacing (DL SCS) (15, 30, 60, 120) kHz of the active BWP of the scheduled cell, Z is (1, 1, 2, 2) respectively.

[0248] In the above formula, μ scheduling represents the parameter set (subcarrier spacing configuration) of the scheduling cell, and μ scheduled Indicates the parameter set (subcarrier spacing configuration) of the scheduled cell. For {15kHz, 30kHz, 60kHz, 120kHz}, it can have values ​​of {0, 1, 2, 3} respectively.

[0249] Option 3) Combination of Option 1 and Option 2

[0250] Parameters Y and Z may be determined based on the scheduled cell and the scheduling cell, respectively. For example, since Y means the minimum applicable value K0 / K2 before the change, it is determined based on the scheduled cell to which the minimum applicable value is applied. And Z may be determined based on the scheduling cell in which the actual PDCCH decoding is performed.

[0251] In cross-carrier scheduling, the application delay of the scheduled cell may be determined as follows.

[0252] In the application delay X for applying the minimum applicable K0 / K2 value (K0min / K2min) indicated for the scheduled cell triggered by a 1-bit indication of DCI format 1_1 or 0_1 in the scheduling cell,

[0253] The UE receives a DCI indicating a change in time slot n of the scheduling cell.

[0254] The UE may be scheduled in the DCI in the time slot (n+X) of the scheduling cell with the minimum applicable K0 / K2 value for the PDSCH / PUSCH of the scheduled cell.

[0255] For cross-carrier scheduling, X = max(Y·(2 μscheduling / 2 μscheduled ), Z) or X=max(ceil(Y·(2 μscheduling / 2 μscheduled )), Z). Here, Y is the active minimum applicable K0 value of the active DL BWP of the scheduled cell before the change indication, and Z is (1, 1, 2, 2) for each downlink subcarrier spacing (DL SCS) (15, 30, 60, 120) kHz of the active BWP of the scheduled cell, respectively.

[0256] Fig.16 A method for determining an application delay value according to Option 3 is illustrated.

[0257] refer to Fig.16 , the UE receives downlink control information (DCI) (S161) including information indicating a change in the value of K0min or K2min in the time slot n of the scheduling cell. For example, in the time slot n of the scheduling cell, a first DCI including information indicating a change in the value of K2min as the minimum scheduling offset may be received.

[0258] The DCI may be received in symbols preceding a specific symbol index of slot n (eg, the first 3 symbols of slot n).

[0259] Each of K0min and K2min is a minimum scheduling offset limit for application. Specifically, K0min may be a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for receiving a first DCI and a time slot for receiving a physical downlink shared channel (PDSCH) scheduled by the first DCI, and K2min may be a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for receiving a second DCI and a time slot for sending a physical uplink shared channel (PUSCH) scheduled by the second DCI.

[0260] The UE may determine the application delay X as the maximum of: i) by multiplying the K0min currently applied in the scheduled cell scheduled by the first DCI (let us call this Y) by 2 μscheduling / 2 μscheduled And then performing a first value obtained by rounding up (ceiling) and ii) a second value predetermined depending on the subcarrier spacing (SCS) of the scheduling cell (let us call this Z) (S162).

[0261] That is, the application delay X can be determined by the following equation.

[0262] [Equation 1]

[0263]

[0264] μ scheduling is the subcarrier spacing configuration of the scheduling cell (i.e., the subcarrier spacing configuration associated with the PDCCH, so μ scheduling Expressed as μ PDCCH ) and μ scheduled is the subcarrier spacing configuration of the scheduled cell (i.e., the subcarrier spacing configuration associated with the PDSCH, so μ scheduled Expressed as μ PDSCH ). Y is the K0min value currently applied to the scheduled cell, and Z is the second value.

[0265] Z may be predetermined as shown in the following table depending on the subcarrier spacing (SCS) (or subcarrier spacing configuration μ) of the scheduling cell.

[0266] [Table 6]

[0267] μ Z 0 1 1 1 2 2 3 2

[0268] That is, when the subcarrier spacing (SCS) of the scheduling cell is 15, 30, 60 and 120 kHz, the Z value can be pre-determined as 1, 1, 2, and 2, respectively.

[0269] The UE applies the changed K0min or the changed K2min value after the time slot n+X of the scheduling cell (S163). For example, the UE can expect to receive the second DCI based on the changed K2min value after the time slot n+X of the scheduling cell. From the network point of view, starting from the time slot n+X of the scheduling cell, the second DCI based on the changed K2min value is sent.

[0270] Thereafter, the UE transmits a PUSCH scheduled by the second DCI. The offset (difference) between the time slot in which the second DCI is received and the time slot in which the PUSCH scheduled by the second DCI is transmitted should be equal to or greater than the changed K2min. The UE may perform a power saving operation between the time slot in which the second DCI is received and the time slot in which the PUSCH scheduled by the second DCI is transmitted.

[0271] On the other hand, as described above in "Option 2) Determine the Z value based on the position of the CORESET (group)", if DCI is received in a symbol after a specific symbol index of slot n (for example, a symbol outside the first 3 symbols of slot n), the value of X is determined after increasing the second value Z by 1. The reason for this is that the decoding (completion) timing of the DCI may be slot n+1 instead of slot n, depending on the position of the CORESET.

[0272] For example, it is assumed that downlink control information (DCI) including information indicating a change in the value of K0min or K2min is received in the last three symbols of slot n. In this case, equation 1 is used when obtaining the application delay X, but the Z value from Table 6 is incremented by one (ie, Z+1), instead of the Z value from Table 6, and then used for Z in equation 1.

[0273] Fig.17 It is an application Fig.16 An example of a method.

[0274] refer to Fig.17 , assuming that the subcarrier spacing (SCS) configuration of the scheduling cell is μ=0, and the SCS configuration of the scheduled cell is μ=1. For convenience, it is assumed that K0min (i.e., Y) currently applied to the scheduled cell is called K0minOld, and its value is 1. Since the subcarrier spacing (SCS) configuration of the scheduling cell is μ=0, Z=1.

[0275] The DCI including information indicating a change to K0min may be received within the first three symbols of slot n of the active DL BWP of the scheduling cell. In addition, it is assumed that the DCI is a DCI for cross-carrier scheduling.

[0276] The DCI may be, for example, DCI format 0_1 ​​for scheduling one or more PUSCHs and DCI format 1_1 for scheduling PDSCHs. Each of DCI format 0_1 ​​and DCI format 1_1 may or may not include a 1-bit "minimum applicable scheduling offset indicator", Fig.17 Examples include cases. In the case of DCI format 0_1, when the value of the "minimum applicable scheduling offset indicator" is 0, it indicates the first value among the K2min values ​​set by the higher layer signal. When the value of the "minimum applicable scheduling offset indicator" is 1, it indicates the second value (if any) or 0 (if there is no second value) among the K2min values ​​set by the higher layer signal. In the case of DCI format 1_1, when the value of the "minimum applicable scheduling offset indicator" is 0, it indicates the first value among the K0min values ​​set by the higher layer signal. When the value of the "minimum applicable scheduling offset indicator" is 1, it indicates the second value (if any) or 0 (if there is no second value) among the K0min values ​​set by the higher layer signal.

[0277] Whether a change in the K0min / K2min value is indicated may be determined based on the value of K0min / K2min indicated by the value of the "minimum applicable scheduling offset indicator".

[0278] When the DCI indicates a change in the value of K0min( / K2min), the time point at which the changed K0min( / K2min) is applied is time slot n+X, where X is X=max(ceil(1·2 0 / 2 1 ),1) = 1. Therefore, the time point at which the change of K0min / K2min is applied becomes the time slot n+1.

[0279] Fig.18 It is an application Fig.16 Another example of the method.

[0280] refer to Fig.18 , assuming that the subcarrier spacing (SCS) configuration of the scheduling cell is μ=2, and the SCS configuration of the scheduled cell is μ=1. For convenience, it is assumed that K0min (i.e., Y) currently applied to the scheduled cell is called K0minOld, and its value is 1. Since the subcarrier spacing (SCS) configuration of the scheduling cell is μ=2, Z=2.

[0281] The DCI including information indicating the change of K0min may be received within the first three symbols of the slot n of the active DL BWP of the scheduling cell. In addition, it is assumed that the DCI is a DCI for cross-carrier scheduling.

[0282] When the DCI indicates a change in the value of K0min( / K2min), the time point at which the changed K0min( / K2min) is applied is time slot n+X, where X is X=max(ceil(1,2 2 / 2 1 ),2) = 2. Therefore, the time point at which the change of K0min / K2min is applied becomes the time slot n+2.

[0283] Fig.19 The figure shows the signaling method between the network (base station) and the UE.

[0284] refer to Fig.19 , the base station provides a higher layer signal for setting the K2min value to the UE (S191). For example, 'minimumSchedulingOffsetK2' may be provided through 'PUSCH-Config' for setting UE-specific PUSCH parameters, and 'minimumSchedulingOffsetK2' may include a list of K2min values.

[0285] The base station sends a first DCI including information indicating a change to K2min to the UE in the time slot n of the scheduling cell (S192). The first DCI may be DCI format 0_1 ​​or DCI format 1_1. The first DCI may be sent within the first three symbols of the time slot n or outside the first three symbols, and the Z value used to determine the application delay X may vary depending on the position where it is sent. This has been described above. The first DCI may notify the change of K2min through a 1-bit field. This has been described above.

[0286] The UE determines an application delay value X related to the time of applying the changed K2min (S193). As described above, the X value can be determined based on the current K0min of the scheduled cell, the SCS configuration of the scheduling cell and the scheduled cell, and a predetermined value depending on the SCS configuration of the scheduling cell. For example, Equation 1 can be used.

[0287] The base station transmits a second DCI (a second DCI based on the changed K2min) to which the changed K2min is applied in the time slot n+X of the scheduling cell (S194). Thereafter, a PUSCH scheduled by the second DCI is received in the scheduled cell (S196). The time interval between the second DCI and the PUSCH should be equal to or greater than the changed K2min. In this time interval, the UE can perform a sleep operation or a PDCCH decoding relaxation operation to save power (S195).

[0288] Fig. 20 The figure shows the signaling method between the network (base station) and the UE.

[0289] refer to Fig. 20 , the base station provides a higher layer signal for setting the K0min value to the UE (S201). For example, 'minimumSchedulingOffsetK0' may be provided through 'PDSCH-Config' for setting UE-specific PDSCH parameters, and 'minimumSchedulingOffsetK0' may include a list of K0min values.

[0290] The base station sends a third DCI including information indicating a change to K0min to the UE in the time slot m of the scheduling cell (S202). The third DCI may be DCI format 0_1 ​​or DCI format 1_1. The third DCI may be sent within the first three symbols of the time slot m or outside the first three symbols, and the Z value for determining the application delay X may vary depending on where it is sent. This has been described above. The third DCI may notify the change of K0min through a 1-bit field. This has been described above.

[0291] The UE determines an application delay value X related to the time of applying the changed K0min (S203). As described above, the X value can be determined based on the current K0min of the scheduled cell, the SCS configuration of the scheduling cell and the scheduled cell, and a predetermined value depending on the SCS configuration of the scheduling cell. For example, Equation 1 can be used.

[0292] The base station transmits the fourth DCI to which the changed K0min is applied (the fourth DCI based on the changed K0min) after the time slot m+X of the scheduling cell (S204). Thereafter, the PDSCH scheduled by the fourth DCI is transmitted in the scheduled cell (S206). The time interval between the fourth DCI and the PDSCH should be equal to or greater than the changed K0min. In this time interval, the UE can perform a sleep operation or a PDCCH decoding relaxation operation to save power (S205).

[0293] Fig.21 Illustrations are for wireless devices used in this manual.

[0294] refer to Fig.21 , the first wireless device 100 and the second wireless device 200 may transmit and receive radio signals through various wireless access technologies (e.g., LTE and NR).

[0295] The first wireless device 100 includes at least one processor 102 and at least one memory 104, and may further include at least one transceiver 106 and / or at least one antenna 108. The processor 102 may be configured to control the memory 104 and / or the transceiver 106 and implement the description, functions, processes, proposals, methods and / or operation flowcharts disclosed herein. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then may transmit a radio signal including the first information / signals through the transceiver 106. In addition, the processor 102 may receive a radio signal including second information / signals through the transceiver 106, and may store information obtained from signal processing of the second information / signals in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing some or all of the processes controlled by the processor 102 or executing the description, functions, processes, proposals, methods and / or operation flowcharts disclosed herein. Here, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a radio communication technology (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and may send and / or receive radio signals via at least one antenna 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be replaced by a radio frequency (RF) unit. In this specification, a wireless device may refer to a communication modem / circuit / chip.

[0296] The second wireless device 200 includes at least one processor 202 and at least one memory 204, and may further include at least one transceiver 206 and / or at least one antenna 208. The processor 202 may be configured to control the memory 204 and / or the transceiver 206 and implement the description, functions, processes, proposals, methods and / or operation flowcharts disclosed herein. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. In addition, the processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and may store information obtained from signal processing of the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing some or all of the processes controlled by the processor 202 or executing the description, functions, processes, proposals, methods and / or operation flowcharts disclosed herein. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a radio communication technology (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and may send and / or receive radio signals via at least one antenna 208. The transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be replaced by an RF unit. In this specification, a wireless device may refer to a communication modem / circuit / chip.

[0297] In the following, the hardware elements of the wireless devices 100 and 200 are described in detail. At least one protocol layer may be implemented by at least one processor 102 and 202, but is not limited thereto. For example, at least one processor 102 and 202 may implement at least one layer (e.g., a functional layer such as PHY, MAC, RLC, PDCP, RRC, and SDAP layers). At least one processor 102 and 202 may generate at least one protocol data unit (PDU) and / or at least one service data unit (SDU) according to the description, function, process, proposal, method, and / or operation flowchart disclosed herein. At least one processor 102 and 202 may generate a message, control information, data, or information according to the description, function, process, proposal, method, and / or operation flowchart disclosed herein. At least one processor 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the function, process, proposal, and / or method disclosed herein, and may provide a signal to at least one transceiver 106 and 206. At least one processor 102 and 202 may receive a signal (e.g., a baseband signal) from at least one transceiver 106 and 206 and may obtain a PDU, SDU, message, control information, data, or information according to the description, functions, processes, proposals, methods, and / or operational flow charts disclosed herein.

[0298] At least one processor 102 and 202 may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. At least one processor 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, at least one application specific integrated circuit (ASIC), at least one digital signal processor (DSP), at least one digital signal processing device (DSPD), at least one programmable logic device (PLD), or at least one field programmable gate array (FPGA) may be included in at least one processor 102 and 202. One or more processors 102 and 202 may be implemented as at least one computer readable medium (CRM) including instructions executed by at least one processor.

[0299] For example, Figures 16 to 20 Each method described in the method can be performed by at least one computer readable medium (CRM), which includes instructions based on being executed by at least one processor. The CRM can perform, for example, receiving downlink control information (DCI) in a time slot n of a scheduling cell, the downlink control information (DCI) including information for changing the value of K0min or K2min, each of K0min and K2min being the minimum scheduling offset limit applied, and applying the changed K0min or changed K2min value in the time slot n+X of the scheduling cell. The X value is i) obtained by multiplying the currently applied K0min (Y) in the scheduled cell scheduled by the DCI by 2μscheduling / 2 μscheduled and then performing rounding up to obtain the first value and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell. μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell.

[0300] The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, functions, etc. Firmware or software configured to perform the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein may be included in at least one processor 102 and 202 or may be stored in at least one memory 104 and 204 and may be executed by at least one processor 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of codes, instructions, and / or instruction sets.

[0301] At least one memory 104 and 204 may be connected to at least one processor 102 and 202 and may store various forms of data, signals, messages, information, programs, codes, instructions and / or commands. At least one memory 104 and 204 may be configured as ROM, RAM, EPROM, flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. At least one memory 104 and 204 may be arranged inside and / or outside of at least one processor 102 and 202. In addition, at least one memory 104 and 204 may be connected to at least one processor 102 and 202 via various technologies such as wired or wireless connections.

[0302] At least one transceiver 106 and 206 can send user data, control information, radio signals / channels, etc. mentioned in the method and / or operation flow chart disclosed herein to at least different devices. At least one transceiver 106 and 206 can receive user data, control information, radio signals / channels, etc. mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed herein from at least one different device. For example, at least one transceiver 106 and 206 can be connected to at least one processor 102 and 202 and can send and receive radio signals. For example, at least one processor 102 and 202 can control at least one transceiver 106 and 206 to send user data, control information or radio signals to at least one different device. In addition, at least one processor 102 and 202 can control at least one transceiver 106 and 206 to receive user data, control information or radio signals from at least one different device. At least one transceiver 106 and 206 may be connected to at least one antenna 108 and 208 and may be configured to send or receive user data, control information, radio signals / channels, etc. mentioned in the description, functions, processes, proposals, methods and / or operation flow charts disclosed herein through at least one antenna 108 and 208. In this document, at least one antenna may be a plurality of physical antennas or may be a plurality of logical antennas (e.g., antenna ports). At least one transceiver 106 and 206 may convert received radio signals / channels from RF band signals to baseband signals so as to process received user data, control information, radio signals / channels, etc. using at least one processor 102 and 202. At least one transceiver 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using at least one processor 102 and 202 from baseband signals to RF bad signals. To this end, at least one transceiver 106 and 206 may include an (analog) oscillator and / or a filter.

[0303] Fig. 22 An example of the structure of the signal processing module is shown in FIG. Fig.21 Signal processing is performed in processors 102 and 202.

[0304] refer to Fig. 22 , a transmitting device in a UE or BS (e.g., a processor, a processor and a memory, or a processor and a transceiver) may include a scrambler 301, a modulator 302, a layer mapper 303, an antenna port mapper 304, a resource block mapper 305, and a signal generator 306.

[0305] The transmitting device may transmit one or more codewords. The coded bits in each codeword are scrambled by the corresponding scrambler 301 and transmitted on the physical channel. The codeword may be referred to as a data string and may be equivalent to a transport block which is a data block provided by the MAC layer.

[0306] The scrambled bits are modulated into complex-valued modulation symbols by the corresponding modulator 302. The modulator 302 can modulate the scrambled bits according to the modulation scheme to arrange the complex-valued modulation symbols representing the position on the signal constellation. The modulation scheme is not limited, and the coded data can be modulated using m-PSK (M-Phase Shift Keying) or m-QAM (M-Quadrature Amplitude Modulation). The modulator can be called a modulation mapper.

[0307] The complex-valued modulation symbols may be mapped to one or more transmission layers by the layer mapper 303. The complex-valued modulation symbols on each layer may be mapped by the antenna port mapper 304 for transmission on the antenna port.

[0308] Each resource block mapper 305 can map the complex-valued modulation symbol for each antenna port to an appropriate resource element in a virtual resource block allocated for transmission. The resource block mapper can map the virtual resource block to a physical resource block according to an appropriate mapping scheme. The resource block mapper 305 can allocate the complex-valued modulation symbol for each antenna port to an appropriate subcarrier and multiplex the complex-valued modulation symbol according to the user.

[0309] The signal generator 306 can modulate the complex-valued modulation symbol (i.e., antenna-specific symbol) for each antenna port according to a specific modulation scheme (e.g., OFDM (Orthogonal Frequency Division Multiplexing)) to generate a complex-valued time-domain OFDM symbol signal. The signal generator can perform IFFT (Inverse Fast Fourier Transform) on the antenna-specific symbol, and can insert a CP (Cyclic Prefix) into the time-domain symbol on which IFFT has been performed. The OFDM symbol is subjected to digital-to-analog conversion and up-conversion, and then is sent to a receiving device through each transmission antenna. The signal generator may include an IFFT module, a CP insertion unit, a digital-to-analog converter (DAC), and an up-converter.

[0310] Fig.23 Another example of the structure of the signal processing module in the transmitting device is shown. In this article, the processor (such as Fig.21 Signal processing is performed in processors 102 and 202).

[0311] refer to Fig.23 , a transmitting device (e.g., a processor, a processor and a memory, or a processor and a transceiver) in a UE or a BS may include a scrambler 401, a modulator 402, a layer mapper 403, a precoder 404, a resource block mapper 405, and a signal generator 406.

[0312] The transmitting device may scramble the coded bits in the codeword through the corresponding scrambler 401 and then transmit the scrambled coded bits through the physical channel.

[0313] The scrambled bits are modulated into complex-valued modulation symbols by the corresponding modulator 402. The modulator may modulate the scrambled bits according to a predetermined modulation scheme to arrange complex-valued modulation symbols representing positions on a signal constellation. The modulation scheme is not limited, and the coded data may be modulated using pi / 2-BPSK (pi / 2-binary phase shift keying), m-PSK (m-phase shift keying), or m-QAM (m-quadrature amplitude modulation).

[0314] The complex-valued modulation symbols may be mapped to one or more transmission layers by the layer mapper 403 .

[0315] The complex-valued modulation symbols on each layer may be precoded by the precoder 404 for transmission on the antenna port. Here, the precoder may perform transform precoding on the complex-valued modulation symbols and then perform precoding. Alternatively, the precoder may perform precoding without performing transform precoding. The precoder 404 may use multiple transmission antennas, process the complex-valued modulation symbols according to MIMO, to output antenna-specific symbols, and assign the antenna-specific symbols to the corresponding resource block mapper 405. The output z of the precoder 404 may be obtained by multiplying the output y of the layer mapper 403 by the N×M precoding matrix W. Here, N is the number of antenna ports and M is the number of layers.

[0316] Each resource block mapper 405 maps the complex-valued modulation symbols for each antenna port to appropriate resource elements in a virtual resource block allocated for transmission.

[0317] The resource block mapper 405 may allocate complex-valued modulation symbols to appropriate subcarriers and multiplex the complex-valued modulation symbols according to users.

[0318] The signal generator 406 can modulate the complex-valued modulation symbol according to a specific modulation scheme (e.g., OFDM) to generate a complex-valued time-domain OFDM symbol signal. The signal generator 406 can perform IFFT (Inverse Fast Fourier Transform) on the antenna-specific symbol, and can insert a CP (Cyclic Prefix) into the time-domain symbol on which the IFFT has been performed. The OFDM symbol is subjected to digital-to-analog conversion and up-conversion, and then sent to the receiving device through each transmitting antenna. The signal generator 406 may include an IFFT module, a CP insertion unit, a digital-to-analog converter (DAC), and an up-converter.

[0319] The signal processing process of the receiving device can be opposite to the signal processing process of the transmitting device. Specifically, the processor of the transmitting device decodes and demodulates the RF signal received by the antenna port of the transceiver. The receiving device may include multiple receiving antennas, and the signal received by the receiving antenna is restored to a baseband signal, and then multiplexed and demodulated according to MIMO to restore it to a data string intended to be sent by the transmitting device. The receiving device may include a signal recovery unit that recovers the received signal to a baseband signal, a multiplexer for combining and multiplexing the received signal, and a channel demodulator for demodulating the multiplexed signal string to a corresponding codeword. The signal recovery unit, the multiplexer and the channel demodulator may be configured as an integrated module or an independent module for performing its function. More specifically, the signal recovery unit may include an analog-to-digital converter (ADC) for converting an analog signal to a digital signal, a CP removal unit for removing CP from a digital signal, a FET module for applying FFT (Fast Fourier Transform) to a signal from which CP has been removed to output a frequency domain symbol, and a resource element demapper / equalizer for recovering the frequency domain symbol to an antenna-specific symbol. The antenna-specific symbols are restored by the multiplexer to the transport layer, and the transport layer is restored by the channel demodulator to the codewords intended to be sent by the transmitting device.

[0320] Fig.24 An example of a wireless communication device according to an implementation example of the present disclosure is illustrated.

[0321] refer to Fig.24 , a wireless communication device (e.g., UE) may include at least one of the following: a processor 2310 (such as a digital signal processor (DSP) or a microprocessor), a transceiver 2335, a power management module 2305, an antenna 2340, a battery 2355, a display 2315, a keyboard 2320, a global positioning system (GPS) chip 2360, a sensor 2365, a memory 2330, a subscriber identity module (SIM) card 2325, a speaker 2345, and a microphone 2350. Multiple antennas and multiple processors may be provided.

[0322] The processor 2310 may implement the functions, processes, and methods described in this specification. Fig.24 The processor 2310 in may be Fig.21 Processors 102 and 202 in.

[0323] The memory 2330 is connected to the processor 2310 and stores information related to the operation of the processor. The memory may be located inside or outside the processor and connected to the processor through various technologies such as wired connection and wireless connection. Fig.24 The memory 2330 may be Fig.21 The memories 104 and 204 in FIG.

[0324] The user can input various types of information such as a phone number using various techniques such as pressing a button of the keypad 2320 or activating sound using the microphone 2350. The processor 2310 can receive and process the user information and perform appropriate functions, such as making a call using the input phone number. In some scenarios, data can be retrieved from the SIM card 2325 or the memory 2330 to perform appropriate functions. In some scenarios, the processor 2310 can display various types of information and data on the display 2315 for user convenience.

[0325] The transceiver 2335 is connected to the processor 2310 and transmits and / or receives RF signals. The processor can control the transceiver to start communication or transmit RF signals including various types of information or data (such as voice communication data). The transceiver includes a transmitter and a receiver for sending and receiving RF signals. Antenna 2340 can facilitate the transmission and reception of RF signals. In some implementation examples, when the transceiver receives an RF signal, the transceiver can forward and convert the signal to a baseband frequency for processing performed by the processor. The signal can be processed by various techniques, such as converted into audible or readable information to be output through the speaker 2345. Fig.24 The transceiver in can be Fig.21 The transceivers 106 and 206 in FIG.

[0326] Despite Fig.24 Although not shown in the figure, various components such as a camera and a universal serial bus (USB) port may be additionally included in the UE. For example, the camera may be connected to the processor 2310.

[0327] Fig.24 is an example of an implementation of the UE, and the implementation example of the present disclosure is not limited thereto. The UE does not basically need to include Fig.24 That is, some components (e.g., keypad 2320, GPS chip 2360, sensor 2365, and SIM card 2325) may not be essential components. In this case, they may not be included in the UE.

[0328] Fig.25 An example of a processor 2000 is shown.

[0329] refer to Fig.25 , the processor 2000 may include a control channel monitoring unit 2010 and a data channel receiving unit 2020. The processor 2000 may execute reference Figures 16 to 20The method described above (the location of the receiver, for example, the location of the UE). For example, the processor 200 may receive downlink control information (DCI) in a time slot n of a scheduling cell, which includes information notifying a change in the value of K0min or K2min, each of which is a minimum scheduling offset limit applied. In addition, the processor 2000 applies the changed K0min or the changed K2min value in a time slot n+X of the scheduling cell. The X value is i) obtained by multiplying the K0min (Y) currently applied in the scheduled cell scheduled by the DCI by 2 μscheduling / 2 μscheduled and then performing rounding up to obtain the first value and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell. μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell. The processor 2000 may be Fig.21 Examples of processors 102 and 202.

[0330] Fig.26 An example of a processor 3000 is shown.

[0331] refer to Fig.26 , the processor 3000 may include a control information / data generating module 3010 and a transmission module 3020. The processor 3000 may execute Figures 16 to 20 The method described by the angle of the transmitter in the scheduling cell. For example, the processor 3000 may send downlink control information (DCI) to the user equipment in the time slot n of the scheduling cell, which includes information for changing the value of K0min or K2min, each of which is the minimum scheduling offset limit applied. The processor 3000 may assume that the changed K0min or the changed K2min value is applied in the time slot n+X of the scheduling cell. The X value is i) obtained by multiplying the K0min (Y) currently applied in the scheduled cell scheduled by the DCI by 2 μscheduling / 2 μscheduled and then performing rounding up to obtain the first value and ii) the second value (Z) predetermined depending on the subcarrier spacing (SCS) of the scheduling cell. μscheduling is the subcarrier spacing configuration of the scheduling cell and μscheduled is the subcarrier spacing configuration of the scheduled cell. The processor 3000 may be Fig.21 Examples of processors 102 and 202.

[0332] Fig. 27 Another example of a wireless device is shown.

[0333] according to Fig. 27, the wireless device may include at least one processor 102 , 202 , at least one memory 104 , 204 , at least one transceiver 106 , 206 , and one or more antennas 108 , 208 .

[0334] Fig. 27 An example of a wireless device described in Fig.21 The example of the wireless device described in the embodiment differs in that the processors 102 and 202 and the memories 104 and 204 are in Fig.21 are separated in the memory 104 and 204. Fig. 27 In the example of , the processor 102 and the memory 202 are included. That is, the processor and the memory may constitute a chipset.

[0335] Fig.28 Another example of a wireless device applied to the present specification is shown. The wireless device can be implemented in various forms according to use cases / services.

[0336] refer to Fig.28 , the wireless devices 100 and 200 may correspond to Fig.21 The wireless device of the present invention may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and (one or more) transceivers 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. For example, (one or more) transceivers 114 may include Fig.21 The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 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 may transmit the information stored in the storage unit 130 to the outside (e.g., other communication devices) through a wireless / wired interface via the communication unit 110, or store the information received from the outside (e.g., other communication devices) through the communication unit 110 through a wireless / wired interface in the storage unit 130.

[0337] The additional component 140 may be configured differently depending on the type of wireless device. For example, the additional component 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms but is not limited to the following: a robot ( Fig.30 100a), vehicles ( Fig.30 100b-1 and 100b-2), XR devices ( Fig.30 100c), handheld devices ( Fig.30 100d), household appliances ( Fig.30 100e), IoT devices ( Fig.30 100f), digital broadcast UE, hologram equipment, public safety equipment, MTC equipment, medical equipment, fintech equipment (or financial equipment), security equipment, climate / environmental equipment, AI server / equipment ( Fig.30 400), BS( Fig.30 200 in), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed location.

[0338] exist Fig.28 In the wireless devices 100 and 200, all the various elements, components, units and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least some of them may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected through a wire, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. In addition, each element, component, unit and / or module within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. For example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, a memory control processor, and the like. For another example, the storage unit 130 may be configured by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0339] Fig.29 The diagram shows a handheld device applied to the present disclosure. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), and a portable computer (e.g., a notebook). The handheld 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).

[0340] refer to Fig.29, the handheld device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a storage unit 130, a power supply unit 140a, an interface unit 140b, and an I / O unit 140c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to Fig.28 Blocks 110 to 130 / 140.

[0341] The communication unit 110 may send and receive signals (e.g., data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 may control various components of the handheld device 100 to perform various operations. The control unit 120 may include an application processor (AP). The storage unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. In addition, the storage unit 130 may store input / output data / information. The power supply unit 140a supplies power to the handheld device 100 and may include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection between the handheld device 100 and different external devices. The interface unit 140b may include various ports (e.g., audio input / output ports and video input / output ports) for connecting to external devices. The input / output unit 140c may receive or output image information / signals, audio information / signals, 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 tactile module.

[0342] For example, in data communication, the input / output unit 140c can obtain information / signals (e.g., touch, text, voice, image, and video) input from a user, and the obtained information / signals can be stored in the storage unit 130. The communication unit 110 can convert the information / signals stored in the storage unit into radio signals, and can directly send the converted radio signals to different wireless devices or base stations. In addition, the communication unit 110 can receive radio signals from different wireless devices or base stations, and can reconstruct the received radio signals into original information / signals. The reconstructed information / signals can be stored in the storage unit 130, and can then be output in various forms (e.g., text, voice, image, video, and tactile forms) through the input / output unit 140c.

[0343] Fig.30 A communication system 1 applied to the present specification is illustrated.

[0344] refer to Fig.30, the communication system 1 applied to this specification includes a wireless device, a base station (BS) and a network. In this article, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR)) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot 100a, a vehicle 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. In this article, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, BSs and networks may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node with respect to other wireless devices.

[0345] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI 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 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). In addition, an IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0346] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS 200 or BS 200 / BS 200. In this document, wireless communication / connection such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)) may be established through various RATs (e.g., 5G NR). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b may send / receive signals through various physical channels. To this end, at least a portion of various configuration information configuration processes, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping) and resource allocation processes for sending / receiving radio signals may be performed based on various proposals of the present disclosure.

[0347] Here, the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification may include narrowband Internet of Things for low power communication as well as LTE, NR and 6G. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the names described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 and 200 of the present specification may perform communication based on LTE-M technology. In this case, for example, LTE-M technology may be an example of LPWAN technology and may be referred to as various terms such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented as at least one of various standards, such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-bandwidth limited), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, and is not limited to the aforementioned terms. Additionally or alternatively, in consideration of low power communication, the wireless communication technology implemented in the wireless devices 100 and 200 according to the present specification may include at least one of ZigBee, Bluetooth, or a low power wide area network (LPWAN), and is not limited to the aforementioned terms. For example, ZigBee technology may create a PAN (Personal Area Network) related to small / low power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various terms.

[0348] NR supports multiple parameter sets (or multiple subcarrier spacing (SCS) ranges) to support various 5G services. For example, when the SCS is 15kHz, it supports wide areas of traditional cellular bands; when the SCS is 30kHz / 60kHz, it supports dense cities, low latency and wider carrier bandwidth; when the SCS is 60kHz or higher, it supports bandwidths greater than 24.25GHz to overcome phase noise.

[0349] The NR frequency band may be defined as two types of frequency ranges (FR1 and FR2). The value of the frequency range may be changed. For example, the two types of frequency ranges (FR1 and FR2) may be as shown in Table 7. For convenience of description, FR1 of the frequency range for the NR system may refer to "a range below 6 GHz", and FR2 may refer to "a range above 6 GHz" and may be referred to as millimeter wave (mmW).

[0350] [Table 7]

[0351] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 450MHz–6000MHz 15,30,60kHz FR2 24250MHz–52600MHz 60,120,240kHz

[0352] As described above, the value of the frequency range of the NR system may be changed. For example, FR1 may include a band from 410 MHz to 7125 MHz, as shown in Table 8. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. The unlicensed band may be used for a variety of purposes, for example, for vehicle communications (e.g., autonomous driving).

[0353] [Table 8]

[0354]

[0355] Fig.31 The illustration is applied to a vehicle or an autonomous vehicle in the present specification. The vehicle or autonomous vehicle can be configured as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0356] refer to Fig.31 , the vehicle or autonomous driving vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving 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 Fig.28 Block 110 / 130 / 140.

[0357] The communication unit 110 may send and receive signals (e.g., data, control signals, etc.) to and from, for example, different vehicles, base stations (e.g., base stations, road-side units, etc.), and servers. The control unit 120 may control elements of the vehicle or autonomous driving vehicle 100 to perform various operations. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may enable the vehicle or autonomous driving vehicle 100 to travel on the ground. The drive unit 140a may include an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous driving vehicle 100 and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may obtain vehicle conditions, environmental information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight sensor, a heading sensor, a position module, a vehicle front / rear vision sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technology for maintaining a driving lane, technology for automatically adjusting speed such as adaptive cruise control, technology for autonomous driving along a set route, technology for automatically setting a route and driving when reaching a set destination, etc.

[0358] For example, the communication unit 110 may receive map data, traffic condition data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the obtained data. The control unit 120 may control the drive unit 140a to move the vehicle or the autonomous driving vehicle 100 along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 may obtain updated traffic condition data from an external server irregularly / regularly, and may obtain surrounding traffic condition data from neighboring vehicles. In addition, during autonomous driving, the sensor unit 140c may obtain vehicle conditions and environmental information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 may send information about the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server may use AI technology, etc. to predict traffic condition data in advance based on information collected from the vehicle or autonomous driving vehicle, and may provide the predicted traffic condition data to the vehicle or autonomous driving vehicle.

[0359] The claims disclosed in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or performed in a device, and the technical features in the device claims of this specification can be combined to be implemented or performed in a method. In addition, the technical features in the method claims and device claims of this specification can be combined to be implemented or performed in a device. In addition, the technical features in the method claims and device claims of this specification can be combined to be implemented or performed in a method.

Claims

1. A method for determining when to apply a changed minimum scheduling offset limit in a wireless communication system, the method being performed by a user equipment UE, and include: In a time slot n of a scheduling cell, first downlink control information DCI is received (S161), the first downlink control information DCI having an indication of a change to K 2min field, the K 2min is a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for receiving the second DCI and a time slot for transmitting a physical uplink shared channel PUSCH scheduled by the second DCI, In the time slot n+X of the scheduling cell, receive the K based on the change 2min the second DCI of the value, and sending a PUSCH scheduled by the second DCI, Wherein, the X is determined based on the following equation, Wherein, Y is the K currently applied in the scheduled cell. 0min value, and the K 0min is a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for receiving a first DCI and a time slot for receiving a physical downlink shared channel PDSCH scheduled by the first DCI, the μ PDCCH is the subcarrier spacing configuration for the physical downlink control channel PDCCH in the scheduling cell, and the μ PDSCH is the subcarrier spacing configuration for the PDSCH in the scheduled cell, and Z is a value determined by the subcarrier spacing in the scheduling cell, Wherein, based on the subcarrier spacing of the scheduling cell being 15kHz, 30kHz, 60kHz, and 120kHz, the Z is 1, 1, 2, and 2 respectively, and Wherein, based on receiving the first DCI in a symbol after a specific symbol index of the time slot n, the X is determined after increasing the Z by 1.

2. The method according to claim 1, further comprising: include: A third DCI is received in the time slot m of the scheduling cell, the third DCI having an indication that the time slot is changed to K 0min fields, In the time slot m+X of the scheduling cell, receiving the K based on the change 0min The fourth DCI of the value, and A physical downlink shared channel PDSCH scheduled by the fourth DCI is received.

3. The method according to claim 2, in, The third DCI is received in a symbol preceding a specific symbol index of the time slot m.

4. The method according to claim 2, in, The X is determined after increasing the Z by 1 based on receiving the third DCI in a symbol following the specific symbol index of the time slot m.

5. The method according to claim 1, in, The time slot n includes a total of 14 symbols in the time domain.

6. A user equipment (UE), include: at least one transceiver (2335) for sending and receiving radio signals; as well as at least one processor (2310), the at least one processor (2310) being operatively connected to the at least one transceiver (2335), Wherein, the at least one processor (2310) is configured to: In a time slot n of a scheduling cell, first downlink control information DCI is received (S161), the first downlink control information DCI having an indication of a change to K 2min field, the K 2min is a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for receiving the second DCI and a time slot for transmitting a physical uplink shared channel PUSCH scheduled by the second DCI, In the time slot n+X of the scheduling cell, receive the K based on the change 2min the second DCI of the value, and sending a PUSCH scheduled by the second DCI, Wherein, the X is determined based on the following equation, Wherein, Y is the K currently applied in the scheduled cell. 0min value, and the K 0min is a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for receiving a first DCI and a time slot for receiving a physical downlink shared channel PDSCH scheduled by the first DCI, the μ PDCCH is the subcarrier spacing configuration for the physical downlink control channel PDCCH in the scheduling cell, and the μ PDSCH is the subcarrier spacing configuration for the PDSCH in the scheduled cell, and Z is a value determined by the subcarrier spacing in the scheduling cell, Wherein, based on the subcarrier spacing of the scheduling cell being 15kHz, 30kHz, 60kHz, and 120kHz, the Z is 1, 1, 2, and 2 respectively, and Wherein, based on receiving the first DCI in a symbol after a specific symbol index of the time slot n, X is determined after increasing the Z by 1.

7. A method for operating a base station in a wireless communication system, the method being performed by the base station and include: Sending first downlink control information DCI to a user equipment UE in a time slot n of a scheduling cell, wherein the first downlink control information DCI has an indication that the value is changed to K 2min field, the K 2min is a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for transmitting the second DCI and a time slot for receiving a physical uplink shared channel PUSCH scheduled by the second DCI, In the time slot n+X of the scheduling cell, the K based on the change is sent to the UE. 2min the second DCI of the value, and receiving, from the UE, a PUSCH scheduled by the second DCI, Wherein, the X is determined based on the following equation, Wherein, Y is the K currently applied in the scheduled cell. 0min value, and the K 0min is a minimum scheduling offset limit associated with a minimum value of an offset between a time slot for transmitting a first DCI and a time slot for transmitting a physical downlink shared channel PDSCH scheduled by the first DCI, the μ PDCCH is the subcarrier spacing configuration for the physical downlink control channel PDCCH in the scheduling cell, and the μ PDSCH is the subcarrier spacing configuration for the PDSCH in the scheduled cell, and Z is a value determined by the subcarrier spacing in the scheduling cell, Wherein, based on the subcarrier spacing of the scheduling cell being 15kHz, 30kHz, 60kHz, and 120kHz, the Z is 1, 1, 2, and 2 respectively, and Wherein, based on receiving the first DCI in a symbol after a specific symbol index of the time slot n, X is determined after increasing the Z by 1.

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