Method for operating device in wireless communication system and device using same

Abstract

A method of operating a device in a wireless communication system and a device using the same are provided. According to the method, an NCR-MT including an NCR of the NCR-MT and an NCR-Fwd receives, from a base station, a beam index applied to an access link between the NCR-Fwd and a terminal and time resource information related to the beam index, and the NCR-Fwd performs a forwarding operation by using a beam indicated by the beam index in a time resource indicated by the time resource information. The time resource information indicates resources of a plurality of time slots to which the beam index is applicable.

Description

Technical Field

[0001] The present disclosure relates to a method for operating a device in a wireless communication system and a device using the same. Background Art

[0002] As more and more communication devices require higher communication capacity, advanced mobile broadband communication compared to existing radio access technologies (RATs) is needed. 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 the next generation of communications. In addition, the design of communication systems that take into account services or user equipment (UE) that are sensitive to reliability and latency is under discussion. The introduction of next-generation RATs that take into account enhanced mobile broadband communication, large-scale MTC, and ultra-reliable low latency communication (URLLC), etc., is under discussion. In this disclosure, for convenience of description, such technology may be referred to as new RAT or new radio (NR).

[0003] In addition, a repeater (also called a relay) can be introduced into NR. The repeater is a network controlled repeater (NCR). The NCR can include an NCR-MT (mobile terminal) and an NCR-Fwd (forwarding). The NCR-MT can perform the function of communicating with the base station and controlling the NCR-Fwd. The NCR-Fwd performs a signal forwarding function. That is, the signal received from the base station can be sent to the UE, and the signal received from the UE can be sent to the base station.

[0004] The link between the base station and the NCR-MT may be referred to as a control link, the link between the base station and the NCR-Fwd may be referred to as a backhaul link, and the link between the NCR-Fwd and the UE may be referred to as an access link.

[0005] When forwarding on the access link of the NCR-Fwd, the base station can aperiodically indicate to the NCR-MT the access link beam direction information applied by the NCR-Fwd. When performing this aperiodic beam direction indication, the base station also indicates the time resource to which the specific beam information is applied. In conventional technology, a time resource consists of consecutive symbol resources within a time slot.

[0006] However, there may be cases where NCR-Fwd performs forwarding operations in the same beam direction using multiple time slot resources, such as repeated transmission of uplink channels. In this case, according to the prior art, since the time resources used for forwarding operations in each time slot must be independently indicated, signaling overhead increases. Summary of the Invention

[0007] Technical issues

[0008] The technical problem to be solved by the present disclosure is to provide a method for operating a device in a wireless communication system and a device using the method.

[0009] Technical Solution

[0010] A method for operating a network controlled relay (NCR) including an NCR-mobile terminal (MT) and an NCR-forwarding device (Fwd) in a wireless communication system, and a device using the method, are provided. The method includes: the NCR receiving, via the NCR-MT, a beam index applied to an access link between the NCR-Fwd and a user equipment (UE) and time resource information associated with the beam index from a base station; and performing a forwarding operation, via the NCR-Fwd, using the beam indicated by the beam index in the time resource indicated by the time resource information. In this case, the time resource information indicates resources of multiple time slots to which the beam index can be applied.

[0011] In another aspect, an NCR and an NCR device using the above method are provided.

[0012] In another aspect, a method for operating a base station in a wireless communication system is provided. The method includes transmitting a beam index applied to an access link between a network controlled repeater-forwarding (NCR-Fwd) and a user equipment (UE) and time resource information associated with the beam index to an NCR including an NCR-Fwd and an NCR-mobile terminal (NCR-MT), and receiving a signal from the NCR-Fwd based on a beam indicated by the beam index in a time resource indicated by the time resource information. Here, the time resource information indicates resources of a plurality of time slots to which the beam index can be applied.

[0013] On the other hand, a base station applying the above base station method is provided.

[0014] Beneficial effects

[0015] According to the present disclosure, when NCR-Fwd performs a forwarding operation in the same beam direction through multiple time slot resources, signaling overhead required to indicate the forwarding operation in multiple time slots can be reduced.

[0016] Furthermore, when time resources for forwarding operations are mixed with resources in different directions (eg, downlink and uplink), ambiguity in forwarding operations can be prevented by clearly specifying how to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The system structure of the next-generation radio access network (NG-RAN) to which NR is applied is illustrated.

[0018] Figure 2 is a diagram illustrating a radio protocol architecture for a user plane.

[0019] Figure 3 is a diagram illustrating a wireless protocol architecture for a control plane.

[0020] Figure 4 Illustrate the functional division between NG-RAN and 5GC.

[0021] Figure 5 An example of a frame structure that can be applied in NR is illustrated.

[0022] Figure 6 The time slot structure of the NR frame is illustrated.

[0023] Figure 7 CORESET is instantiated.

[0024] Figure 8 An example of a frame structure for a new radio access technology is illustrated.

[0025] Figure 9 The structure of a self-contained time slot is illustrated.

[0026] Figure 10 Physical channels and general signal transmission are illustrated.

[0027] Figure 11 The transport network architecture for 5G is illustrated.

[0028] Figure 12 An example of a topology in which an NCR performs transmission and reception between a base station and a UE is shown.

[0029] Figure 13 is a diagram comparing the operation of NCR and existing RF repeaters.

[0030] Figure 14 The structure of NCR is illustrated.

[0031] Figure 15 An operation method of a Network Control Repeater (NCR) including a Mobile Terminal (MT) and a Forwarding (Fwd) in a wireless communication system is illustrated.

[0032] Figure 16 An example of time resources indicated by time resource information according to the present disclosure is shown.

[0033] Figure 17 A case is illustrated in which symbols constituting one time resource include symbols for performing a DL operation and symbols for performing a UL operation.

[0034] Figure 18 The case where a symbol for performing an OFF operation is included in symbols constituting one time resource is exemplified.

[0035] Figure 19 The operation of the NCR when symbols determined as UL operation are included among symbols constituting time resources is illustrated.

[0036] Figure 20 is another example of the operation of the NCR when a symbol determined as a UL operation is included among symbols constituting the time resource.

[0037] Figure 21 An operation method of an NCR in a wireless communication system including a base station, an NCR, and a UE is illustrated.

[0038] Figure 22 Wireless devices suitable for use in this specification are exemplified.

[0039] Figure 23 An example of the structure of a signal processing module is illustrated.

[0040] Figure 24 Another example of the structure of the signal processing module in the transmitting device is illustrated.

[0041] Figure 25 An example of a wireless communication device according to an embodiment of the present disclosure is illustrated.

[0042] Figure 26 Another example of a wireless device is shown.

[0043] Figure 27 Another example of a wireless device suitable for use with this specification is shown.

[0044] Figure 28 A communication system 1 applicable to this specification is illustrated. DETAILED DESCRIPTION

[0045] In this specification, "A or B" may mean "only A", "only B", or "both A and B". In other words, in this specification, "A or B" may be interpreted as "A and / or B". For example, in this specification, "A, B or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0046] As used in this specification, a slash ( / ) or a comma may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0047] In this specification, “at least one of A and B” may mean “only A”, “only B”, or “both A and B”. In addition, in this specification, the expression “at least one of A or B” or “at least one of A and / or B” may be interpreted as “at least one of A and B”.

[0048] In addition, in this specification, “at least one of A, B, and C” may mean “only A,” “only B,” “only C,” or “any combination of A, B, and C.” In addition, “at least one of A, B, or C” or “at least one of A, B, and / or C” may mean “at least one of A, B, and C.”

[0049] In addition, the brackets used in this specification may mean "for example". Specifically, when it is indicated as "control information (PDCCH)", this may mean that "PDCCH" is proposed as an example of "control information". In other words, the "control information" of this specification is not limited to "PDCCH", and "PDDCH" may be proposed as an example of "control information". Specifically, when it is indicated as "control information (i.e., PDCCH)", this may also mean that "PDCCH" is proposed as an example of "control information".

[0050] The technical features described individually in one drawing in this specification may be implemented individually or simultaneously.

[0051] A wireless communication system to which the present disclosure may be applied may also be referred to as, for example, an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) or a Long Term Evolution (LTE) / LTE-A system.

[0052] The E-UTRAN includes a base station (BS) that provides a control plane and a user plane for user equipment (UE). A UE may be fixed or mobile and may be referred to by another term such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal / terminal (MT), a wireless device, a terminal, etc. A BS is typically a fixed station that communicates with a UE and may be referred to by another term such as an evolved Node B (eNB), a base transceiver system (BTS), an access point, etc.

[0053] The BSs are interconnected via an X2 interface. The BSs are also connected to the Evolved Packet Core (EPC) via an S1 interface, more specifically, to the Mobility Management Entity (MME) via S1-MME and to the Serving Gateway (S-GW) via S1-U.

[0054] The EPC includes the MME, S-GW, and Packet Data Network Gateway (P-GW). The MME has UE access information or UE capability information, which is typically used for UE mobility management. The S-GW is a gateway with the E-UTRAN as its endpoint. The P-GW is a gateway with the PDN as its endpoint.

[0055] As more and more communication devices require more communication capacity, mobile broadband communication that is improved over existing radio access technologies is needed. 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 / latency-sensitive services / UEs is under discussion. The introduction of next-generation radio access technologies that consider enhanced mobile broadband communication (eMBB), massive MTC (mMTC), and ultra-reliable low latency communication (URLLC) is discussed. In this disclosure, for convenience, this new technology may be referred to as a new radio access technology (new RAT or NR).

[0056] Figure 1 The system structure of the next-generation radio access network (NG-RAN) to which NR is applied is illustrated.

[0057] Reference Figure 1 , the NG-RAN may include base stations (e.g., gNBs and / or eNBs) that provide user plane and control plane protocol terminations to the UE. Figure 1 This example illustrates a scenario involving only gNBs. gNBs (eNBs) are connected to each other via the Xn interface. The gNBs and eNBs are connected to the 5G Core Network (5GC) via the NG interface. More specifically, the gNBs and eNBs are connected to the Access and Mobility Management Function (AMF) via the NG-C interface and to the User Plane Function (UPF) via the NG-U interface.

[0058] On the other hand, the layers of the radio interface protocol between the UE and the network can be divided into Layer 1 (L1), Layer 2 (L2), and Layer 3 (L3) based on the lower three layers of the Open Systems Interconnection (OSI) model, which is well known in communication systems. Among them, the physical (PHY) layer belonging to Layer 1 provides information transmission services using physical channels, and the radio resource control (RRC) layer belonging to Layer 3 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 base station.

[0059] Figure 2 is a diagram illustrating a radio protocol architecture for a user plane. Figure 3 The diagram shows a wireless protocol architecture for the control plane. The user plane is a protocol stack for user data transmission. The control plane is a protocol stack for control signal transmission.

[0060] Reference Figure 2 and Figure 3 The PHY layer provides information transfer services to upper layers via physical channels. The PHY layer is connected to the media access control (MAC) layer, which is the upper layer of the PHY layer, via transport channels. Data is transferred between the MAC and PHY layers via transport channels. Transport channels are categorized based on how data is transmitted over the radio interface and the characteristics of the data.

[0061] Data moves between different PHY layers (ie, a transmitter's PHY layer and a receiver's PHY layer) through a physical channel. The physical channel may be modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme and use time and frequency as radio resources.

[0062] The functions of the MAC layer include mapping between logical channels and transport channels, as well as multiplexing and demultiplexing into transport blocks provided on the transport channels of MAC service data units (SDUs) belonging to logical channels through physical channels. The MAC layer provides services to the radio link control (RLC) layer through logical channels.

[0063] The RLC layer functions include concatenation, segmentation, and reassembly of RLC SDUs. To ensure the various types of quality of service (QoS) required for radio bearers (RBs), the RLC layer provides three operating modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM). AM RLC provides error correction through automatic repeat request (ARQ).

[0064] The RRC layer is defined only on the control plane. It is associated with the configuration, reconfiguration, and release of radio bearers and is responsible for controlling logical, transport, and physical (PHY) channels. RBs represent logical routes provided by Layer 1 (the PHY layer) and Layer 2 (the MAC layer, RLC layer, and PDCP layer) for transmitting data between the UE and the network.

[0065] The functions of the Packet Data Convergence Protocol (PDCP) layer on the user plane include the transmission of user data and header compression and encryption. The functions of the PDCP layer on the user plane also include the transmission and encryption / integrity protection of control plane data.

[0066] RB configuration defines the characteristics of the radio protocol layer and channel to provide specific services and configures detailed parameters and operating methods. RBs are divided into two types: signaling RBs (SRBs) and data RBs (DRBs). SRBs are used as channels for transmitting RRC messages on the control plane, while DRBs are used as channels for transmitting user data on the user plane.

[0067] 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. Otherwise, the UE is in the RRC idle state.

[0068] The downlink transmission channels used to send data from the network to the UE include the broadcast channel (BCH) for sending system information and the downlink shared channel (SCH) for sending user traffic or control messages. Traffic or control messages for downlink multicast or broadcast services can be sent via the downlink SCH, or can be sent via another downlink multicast channel (MCH). In addition, the uplink transmission channels used to send data from the UE to the network include the random access channel (RACH) for sending initial control messages and the uplink shared channel (SCH) for sending user traffic or control messages.

[0069] Logical channels located above and mapped to transport channels include the Broadcast Control Channel (BCCH), the Paging Control Channel (PCCH), the Common Control Channel (CCCH), the Multicast Control Channel (MCCH), and the Multicast Traffic Channel (MTCH).

[0070] A physical channel consists of multiple OFDM symbols in the time domain and multiple subcarriers in the frequency domain. A subframe consists of 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 can use specific subcarriers of a specific OFDM symbol (e.g., the first OFDM symbol) of the corresponding subframe for the Physical Downlink Control Channel (PDCCH), i.e., the L1 / L2 control channel. The Transmission Time Interval (TTI) is the unit time for subframe transmission.

[0071] Figure 4 Illustrate the functional division between NG-RAN and 5GC.

[0072] Reference Figure 4 The 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 provisioning, dynamic resource allocation, etc. The AMF can provide functions such as NAS security and idle state mobility processing. The UPF can provide functions such as mobility anchoring and PDU processing. The SMF can provide functions such as UE IP address assignment and PDU session control.

[0073] Figure 5 An example of a frame structure that can be applied in NR is illustrated.

[0074] Reference Figure 5, a radio frame (hereinafter referred to as a frame) can be used for uplink and downlink transmission in NR. A frame has a length of 10ms and can be defined as two 5ms half-frames (Half-Frame, HF). A half-frame can be defined as five 1ms subframes (Subframe, SF). A subframe can 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 (= which may also be referred to as a general CP or common CP) is used, each time slot includes 14 symbols. When an extended CP is used, each time slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or DFT-s-OFDM symbol).

[0075] Table 1 below illustrates subcarrier spacing configuration (also referred to as 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 a time slot (N slot symb )wait.

[0079] [Table 2]

[0080]

[0081] exist Figure 5 In FIG, μ=0, 1, 2, and 3 are exemplified.

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

[0083] [Table 2-1]

[0084] <![CDATA[SCS(15·2 μ )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,μ slot ]]> <![CDATA[N subframe,μ slot ]]> 60KHz (μ=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 combined into one UE. Therefore, the (absolute time) duration of time resources (e.g., SF, time slot, or TTI) (collectively referred to as time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently between the combined cells.

[0086] Figure 6 The time slot structure is illustrated.

[0087] A time slot may include multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols (or 7 symbols), but in the case of extended CP, one time slot may include 12 symbols (or 6 symbols). A carrier may include multiple subcarriers in the frequency domain. A resource block (RB) may be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) may be defined as multiple 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 may be performed through activated BWPs, and only one BWP may be activated for one UE. Each element in the resource grid is called a resource element (RE), and one complex symbol may be mapped to an RE.

[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 can be transmitted through resources including 1, 2, 4, 8, or 16 CCEs. Here, a 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 configured with PDCCH monitoring according to the corresponding search space set.

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

[0094] Figure 7 CORESET is instantiated.

[0095] Reference Figure 7 , CORESET includes N in the frequency domain CORESET RB resource blocks and N in the time domain CORESET symb ∈{1, 2, 3} symbols. N may be provided by the base station via higher layer signaling CORESET RB and N CORESET symb .like Figure 7 As illustrated in FIG, a COR ESET may include multiple CCEs (or REGs).

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

[0099] On the other hand, NR introduces the aforementioned CORESET. A CORESET is a radio resource used for control information to be received by a UE and can use only a portion of the frequency domain rather than the entire system bandwidth. Additionally, in the time domain, only some symbols in a time slot can be used. The base station can allocate a CORESET to each UE and transmit control information via the allocated CORESET. In NR, a UE can receive control information from the base station without having to receive the entire system bandwidth.

[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] In addition, NR may require high reliability depending on the application. In this case, the 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 conventional technologies. As an example of a method for meeting the requirement for high reliability, the content included in the DCI can be reduced and / or the amount of resources used for DCI transmission can be increased. 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] Figure 8 An example of a frame structure for a new radio access technology is illustrated.

[0105] In NR, such as Figure 8 As shown in , a structure in which a control channel and a data channel are time-division multiplexed within one TTI may be regarded as a frame structure in order to minimize latency.

[0106] exist Figure 8 In the figure, the shaded area represents the downlink control region, and the black area represents the uplink control region. The remaining area can be used for downlink (DL) data transmission or uplink (UL) data transmission. This structure is characterized by sequentially performing DL and UL transmission within a subframe, so that DL data can be transmitted and UL ACK / NACK can be received within the subframe. As a result, the time required from the occurrence of a data transmission error to the retransmission of data is shortened, thereby minimizing the waiting time for the final data transmission.

[0107] In the data and control TDM subframe structure, a time gap may be required for the base station and UE to switch from transmit mode to receive mode or vice versa. To this end, some OFDM symbols when switching from DL to UL can be set as a guard period (GP) in a self-contained subframe structure.

[0108] Figure 9 The structure of a self-contained time slot is illustrated.

[0109] 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 transmit the DL control channel (hereinafter, the DL control region), and the last M symbols in the time slot can be used to transmit 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 control region and the UL control region can be used to transmit 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.

[0110] 1. DL configuration only

[0111] 2. UL configuration only

[0112] 3. Hybrid UL-DL configuration

[0113] -DL area + GP (guard period) + UL control area

[0114] -DL control area + GP + UL area

[0115] DL area: (i) DL data area, (ii) DL control area + DL data area

[0116] UL region: (i) UL data region, (ii) UL data region + UL control region.

[0117] The PDCCH can be transmitted in the DL control region, and the PDSCH can be transmitted in the DL data region. The PUCCH can be transmitted in the UL control region, and the PUSCH can be transmitted in the UL data region. Downlink control information (DCI), such as DL data scheduling information or UL data scheduling information, can be transmitted in the PDCCH. Uplink control information (UCI), such as ACK / NACK (positive / negative acknowledgment) information for DL ​​data, channel state information (CSI), or scheduling requests (SRs), can be transmitted in the PUCCH. The GP provides a time gap during the transition from transmit mode to receive mode between the gNB and the UE, or during the transition from receive mode to transmit mode between the gNB and the UE. The symbol portion within a subframe that occurs when the mode changes from DL to UL can be configured as a GP.

[0118] <Analog Beamforming #1>

[0119] The shortening of wavelengths to millimeter waves (mmW) allows for the installation of a large number of antenna elements in the same area. Specifically, since the wavelength at 30 GHz is 1 cm, a total of 100 antenna elements can be installed in a 5 × 5 cm panel in a two-dimensional array at intervals of 0.5 λ (wavelength). Therefore, mmW can use a large number of antenna elements to increase beamforming (BF) gain, thereby increasing coverage or improving throughput.

[0120] In this case, if a transceiver unit (TXRU) is provided to adjust the transmit 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 is inefficient in terms of cost. Therefore, a method of mapping a large number of antenna elements to one TXRU using an analog phase shifter and controlling the beam direction is considered. This analog beamforming can form only one beam direction in all frequency bands and therefore cannot provide frequency selective beamforming.

[0121] Hybrid beamforming (BF) with fewer than B TXRUs than Q antenna elements can be considered an intermediate form between digital BF and analog BF. In this case, the number of directions of beams that can be transmitted simultaneously is limited to B, although this number depends on the method of connecting the B TXRUs and the Q antenna elements.

[0122] <Analog Beamforming #2>

[0123] When multiple antennas are used in NR, hybrid beamforming, which is a combination of digital beamforming and analog beamforming, occurs. Here, in analog beamforming (or RF beamforming), the RF end performs precoding (or combining), so it is possible to achieve performance similar to digital beamforming while reducing the number of RF chains and the number of D / A (or A / D) converters. For the convenience of description, the hybrid beamforming structure can be represented by N TXRUs and M physical antennas. Then, the digital beamforming of the L data layers to be sent at the transmitting end can be represented by an N×L matrix, and the converted N digital signals are converted into analog signals via the TXRU, and analog beamforming represented by the M×N matrix is ​​applied.

[0124] System information of the NR system can be transmitted 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) as a reference signal (RS) transmitted by applying a single analog beam (corresponding to a specific antenna panel) to measure the channel of each analog beam is under discussion. 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.

[0125] In NR, in the time domain, a synchronization signal block (SSB, also known as a synchronization signal and physical broadcast channel (SS / PBCH)) may consist of four OFDM symbols indexed in ascending order from 0 to 3 within the synchronization signal block, and the primary synchronization signal (PSS), secondary synchronization signal (SSS), and PBCH associated with the demodulation reference signal (DMRS) may be mapped to the symbols. As described above, the synchronization signal block may also be represented by an SS / PBCH block.

[0126] In NR, since multiple synchronization signal blocks (SSBs) can be transmitted at different times and SSBs can be used to perform initial access (IA), serving cell measurements, etc., it is preferable to transmit the SSB first when the transmission time and resources of the SSB overlap with the transmission time and resources of other signals. To this end, the network can broadcast the transmission time and resource information of the SSB or indicate them through UE-specific RRC signaling.

[0127] In NR, transmission and reception can be performed on a beam-based basis. If the reception performance of the current serving beam deteriorates, a process called beam failure recovery (BFR) can be performed to search for a new beam.

[0128] Since BFR processing is not intended to declare an error or failure in the link between the network and the UE, it can be assumed that the connection to the current serving cell is maintained even if BFR processing is performed. During BFR processing, measurements of different beams configured by the network (which can be represented by CSI-RS ports or synchronization signal block (SSB) indices) can be performed, and the best beam for the corresponding UE can be selected. The UE can perform BFR processing in such a way that it performs RACH processing related to the beam that produces good measurement results.

[0129] Now, the transmission configuration indicator (hereinafter, TCI) state will be described. The TCI state may be configured for each CORESET of the control channel, and a parameter for determining the RX beam of the UE may be determined based on the TCI state.

[0130] For each DL BWP of the serving cell, the UE may be configured for three or fewer CORESETs. Additionally, the UE may receive the following information for each CORESET.

[0131] 1) CORESET index p (e.g., one of 0 to 11, where the index of each CORESET can be uniquely determined in the BWP of one serving cell),

[0132] 2) PDCCH DM-RS scrambling sequence initialization value,

[0133] 3) the duration of the CORESET in the time domain (which can be given in symbols),

[0134] 4) Resource block collection,

[0135] 5) CCE to REG mapping parameters,

[0136] 6) Antenna port quasi co-location, which indicates the quasi co-location (QCL) information of the DM-RS antenna ports used to receive PDCCH in each CORESET (from a set of antenna port quasi co-locations provided by a higher layer parameter called "TCI-State"),

[0137] 7) Indication of the presence of a Transmission Configuration Indication (TCI) field for a specific DCI format transmitted by PDCCH in a CORESET, etc.

[0138] 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 said to be quasi-co-located (QCL). 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 can experience the same / similar channel conditions. 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.

[0139] In this sense, when signal A and signal B are said to be quasi co-located (QCL), this may mean that signal A and signal B experience similar channel conditions, and therefore, the channel information estimated to detect signal A is also useful for detecting signal B. Herein, channel conditions may be defined according to, for example, Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameters, etc.

[0140] 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).

[0141] [Table 4]

[0142] QCL Type describe QCL-Type A Doppler shift, Doppler spread, average delay, delay spread QCL-Type B Doppler shift, Doppler spread QCL-Type C Doppler shift, average delay QCL-Type D Spatial Rx parameters

[0143] 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.

[0144] In addition, for each DL BWP configured for the UE in one serving cell, the UE may be provided with 10 (or fewer) search space sets.For each search space set, the UE may be provided with at least one of the following information.

[0145] 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.

[0146] In NR, CORESET #0 can be configured via PBCH (or UE-specific signaling for handover or PSCell configuration or BWP configuration). Search space (SS) set #0 configured via PBCH can monitor offsets (e.g., slot offset, symbol offset) that are different for each associated SSB. This may be necessary to minimize the search space opportunities monitored by the UE. Alternatively, this may be necessary to provide a beam scanning control / data region capable of performing control / data transmission on a per-beam basis in order to persistently perform communication with the UE in a situation where the UE's optimal beam changes dynamically.

[0147] Figure 10 Physical channels and typical signaling are illustrated.

[0148] Reference Figure 10 In a wireless communication system, a UE receives information from a base station (BS) via a downlink (DL) and transmits information to the BS via an uplink (UL). The data transmitted / received between the BS and the UE includes data and various control information, and various physical channels exist depending on the type / purpose of the information transmitted / received between the BS and the UE.

[0149] A UE that has been powered on again after being powered off or has newly entered a cell performs an initial cell search operation (S11), such as adjusting synchronization with the base station (BS). 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 obtain information such as the cell identity (ID). Furthermore, the UE may receive a physical broadcast channel (PBCH) from the BS to obtain broadcast information in the cell. Furthermore, during the initial cell search, the UE may receive a downlink reference signal (DL RS) to identify the downlink channel status.

[0150] (Initial) cell search is the process by which a UE acquires time and frequency synchronization with a cell and detects the cell ID of the cell. The cell search may be based on the primary synchronization signal and secondary synchronization signal of the cell, and the PBCH DMRS.

[0151] After completing the initial cell search, the UE may receive a physical downlink control channel (PDCCH) and a corresponding physical downlink shared channel (PDSCH) to obtain more specific system information ( S12 ).

[0152] Afterwards, the UE may perform a random access procedure to complete access to the BS (S13 to S16). Specifically, the UE may transmit a preamble through a physical random access channel (PRACH) (S13) and may receive a random access response (RAR) to the preamble through a PDCCH and its corresponding PDSCH (S14). Afterwards, the UE may transmit a physical uplink shared channel (PUSCH) using the scheduling information in the RAR (S15) and may perform a contention resolution procedure (which may be referred to as a process of receiving a contention resolution message) similar to the PDCCH and its corresponding PDSCH (S16).

[0153] After performing the above-mentioned process, the UE can perform PDCCH / PDSCH reception (S17) and PUSCH / physical uplink control channel (PUCCH) transmission (S18) as a typical uplink / downlink signal transmission process. The control information sent by the UE to the BS is called uplink control information (UCI). UCI includes hybrid automatic repeat and request (HARQ) confirmation (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 transmitted through PUCCH. However, when control information and data are to be transmitted at the same time, UCI can be transmitted through PUSCH. In addition, the UE can send UCI aperiodically through PUSCH according to the request / instruction of the network.

[0154] In order to enable reasonable battery consumption when bandwidth adaptation (BA) is configured, only one uplink BWP (bandwidth part) and one downlink BWP or only one downlink / uplink BWP pair for each uplink carrier can be activated at a time in the active serving cell, and all other BWPs configured in the UE are deactivated. In a deactivated BWP, the UE does not monitor the PDCCH and does not transmit on the PUCCH, PRACH, and UL-SCH.

[0155] With BA, the UE's RX and TX bandwidths are not necessarily as wide as the cell's bandwidth and can be adjusted. That is, the width can be commanded to change (e.g., reduced for 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 for different services). A subset of the cell's total cell bandwidth is called a bandwidth part (BWP), and BA is achieved by configuring a BWP for 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, it does not need to monitor the PDCCH across the entire downlink frequency of the cell. A BWP inactivity timer (independent of the DRX inactivity timer mentioned above) is used to switch the active BWP to the default BWP. That is, the timer is restarted when PDCCH decoding is successful, and when the timer expires, the timer switches to the default BWP.

[0156] The following describes the integrated access and backhaul link (IAB). For ease of explanation, the proposed solution is described below based on the new RAT (NR) system. However, the scope of systems to which the proposed solution can be applied is not limited to NR systems, but can also be extended to other systems such as 3GPP LTE / LTE-A systems.

[0157] Among the potential technologies aimed at enabling future cellular network configuration scenarios and applications is the technology that supports wireless backhaul and relay links, which can enable flexible and very dense configuration of NR cells without the need for proportional densification of the transport network.

[0158] Compared to LTE, the larger bandwidth (e.g., mmWave spectrum) that can be utilized in NR, along with native deployment of massive MIMO or multi-beam systems, is expected to create opportunities for the development and deployment of integrated access and backhaul links. This facilitates the deployment of dense networks of self-backhauled NR cells in a more integrated manner by building multiple control and data channels / procedures defined in terms of providing connectivity or access to UEs. Such systems are referred to as integrated access and backhaul links (IAB).

[0159] The following definitions are made in this disclosure.

[0160] -AC(x): access link between node (x) and UE.

[0161] -BH(xy): backhaul link between node (x) and node (y).

[0162] In this case, the node may be a DgNB (donor gNB) or a relay node (RN). The DgNB or donor node may be a gNB that provides backhaul support for the IAB node.

[0163] When there are relay node 1 and relay node 2, and relay node 1 and relay node 2 are connected through a return link and relaying data sent and received by relay node 2, relay node 1 is named the parent node of relay node 2, and relay node 2 is named the child node of relay node 1.

[0164] The technical features described separately in one drawing in this specification may be implemented separately or simultaneously.

[0165] The following figures are used to illustrate a specific example of this specification. The names of specific devices or specific signals / messages / fields recorded in the figures are only examples, so the technical features of this specification are not limited to the specific names used in the following figures.

[0166] The following describes the Network Controlled Relay (NCR) and its operation method in the NR environment. Hereinafter, NCR may be referred to as a relay or repeater. Hereinafter, MT may be referred to as NCR-MT, and RU may be referred to as NCR-Fwd (forwarding).

[0167] <Transport network architecture for 5G>

[0168] Figure 11 The transport network architecture for 5G is illustrated.

[0169] ITU-T (Telecommunication Standardization Sector) has chosen Figure 11 The transport network architecture for 5G shown in (a) is composed of three logical elements: CU (centralized unit), DU (distributed unit), and RU (remote unit).

[0170] In this model, mid- and lower-layer functions are divided into the DU and RU. The RU implements RF functions and, depending on the functional division between the RU and DU, may also implement low-PHY and high-PHY functions. Depending on network requirements, different combinations of CU, DU, and RU form the actual physical network elements.

[0171] For example, Figure 11 As shown in (b) to (d) of FIG, CU, DU, and RU are combined into various combinations. This provides flexibility to accommodate various network architectures, applications, and transmission network requirements.

[0172] like Figure 11 As shown in Figure 1, the transport network between the 5GC and the CU is called the backhaul. The backhaul network implements the 3GPP NG interface. Similarly, the transport network between the CU and the DU is called the midhaul. The midhaul network implements the 3GPP F1 interface. Finally, the transport network between the DU and the RU is called the fronthaul. Backhaul, midhaul, and fronthaul are collectively referred to as xhaul.

[0173] Reconfigurable smart surfaces (RIS), also known as intelligent reflecting surfaces (IRS) and large intelligent surfaces (LIS), are programmable structures that can control the propagation of electromagnetic waves (EM) by changing the electrical and magnetic properties of the surface.

[0174] In addition to electromagnetic wave control, RIS also integrates a detection function for detecting the wireless environment. When RIS is deployed in the environment where the wireless system operates, the properties of the wireless channel can be at least partially controlled.

[0175] The inherent functions of RIS can offer many advantages, including the potential to improve stability and coverage performance through beamforming or range extension. With the ability to control the propagation environment, there are some changes in the existing wireless system design paradigm, where the wireless channel is mostly regarded as an uncontrollable presence that distorts the transmitted signal. Traditional transmitters (TX) and receivers (RX) are designed to equally disperse the influence of the channel. Various scenarios can be imagined, from the case of configuring a RIS on the wall to the case of transmitting signals from a predetermined direction.

[0176] By using RIS, it is possible to provide the 'penetration effect' of transmitting external signals to the base station signals inside the building, and the'reflection effect' in the NLoS (non-line-of-sight) environment, thus improving the coverage of blind spots.

[0177] <Network-controlled repeater in NR>

[0178] (1) Conventional RF repeater

[0179] In the past, the RF repeater was a non-regenerative type of relay node that simply amplified all the received signals and forwarded them. The main advantages of the RF repeater are low cost, easy configuration, and no additional latency. The main disadvantage is that it may increase system interference (pollution) by amplifying both signals and noise.

[0180] (2) Rel-17 WI's RF repeater (RAN4)

[0181] The RF repeater is defined in Rel-17 of RAN4 for the FR1 band FDD / TDD and the FR2 band. Only RF requirements are included in the Rel-17 WI (Work Item Description). It is explicitly stated in the RAN4 WI that "it is assumed that the relay does not perform adaptive beamforming for the UE".

[0182] (3) Rel-18 Network controlled repeater for NR

[0183] Coverage is a fundamental aspect of cellular network configuration. Mobile operators provide overall coverage based on various types of network nodes. Regular full-stack cell configurations are an option, but are not always feasible (for example, when backhaul is unavailable) and may not be economically feasible.

[0184] As a result, new types of network nodes are being considered to increase mobile operators' network configuration flexibility. For example, integrated access and backhaul (IAB) was introduced in Rel-16 and improved in Rel-17 as a new type of network node that eliminates the need for wired backhaul. Another type of network node is the RF repeater, which simply amplifies and forwards all received signals. RF repeaters are widely deployed in 2G, 3G, and 4G to supplement the coverage provided by regular full-stack cells.

[0185] RF repeaters offer a cost-effective means of extending network coverage, but they have limitations. They simply amplify and forward without considering various factors that can improve performance. These factors include information about semi-static and / or dynamic downlink / uplink configurations, adaptive transmitter / receiver spatial beamforming, and on-off states.

[0186] Compared to existing RF repeaters, Network Controlled Repeaters (NCRs) enhance their capabilities by receiving and processing side control information from the network. This side control information enables NCRs to perform amplification and forwarding operations more efficiently. Potential advantages include mitigating unwanted noise amplification, achieving better spatially directional transmission and reception, and simplifying network integration.

[0187] Regarding the study of Network Control Repeater (NCR), the focus will be on the following scenarios and assumptions.

[0188] Network-controlled repeaters are in-band RF repeaters used to extend network coverage in the FR1 and FR2 bands. FR2 configurations prioritize both outdoor and O2I scenarios.

[0189] The network controls the relay transparently to the UE.

[0190] The network controls the relay to maintain both the base station-relay link and the relay-UE link.

[0191] Cost-effectiveness is a core consideration for network controlled repeaters.

[0192] It is necessary to study and identify the following side control information.

[0193] Beamforming information, timing information for aligning the transmit and receive boundaries of network control repeaters, UL-DL TDD configuration information, ON-OFF information for effective interference management and improved energy efficiency, power control information for effective interference management, etc.

[0194] The need to study and identify the L1 / L2 signals (including corresponding configurations) used to transmit side control information. From the management perspective of network control repeaters, the need to study the identification and authentication of network control repeaters.

[0195] It can be considered that NCR is composed of RU and MT.

[0196] Figure 12 An example of a topology in which an NCR performs transmission and reception between a base station and a UE is shown.

[0197] Reference Figure 12 , there are CU and / or DU in the base station, and NCR is connected to the base station. NCR is composed of MT and RU.

[0198] The RU consists only of the RF layer. The RU receives signals sent by the base station at the RF end and forwards them to the UE, and receives signals sent by the UE at the RF end and forwards them to the base station.

[0199] The RU only forwards signals between the base station and the UE, and cannot autonomously generate signals / channels and send them to the base station / UE or receive signals / channels from the base station / UE for detection.

[0200] To forward received signals, the RU can adjust the transmit / receive beam direction, DL / UL direction, ON / OFF, and transmit (Tx) power at the RF end. However, the NCR cannot independently determine the operation of the RU and is completely controlled by the base station.

[0201] The MT includes an RF layer and an L1 layer, an L2 layer, and / or an L3 layer. For example, the MT consists of only the RF layer and the L1 layer, or only the L1 / L2 layers. Alternatively, the MT may consist of the RF layer and the L1 / L2 / L3 layers.

[0202] The MT detects / receives signals / channels sent by the base station, generates signals / channels to be sent to the base station, and transmits them. In addition, the MT receives information required to control the operation of the RU (i.e., side control information) from the base station. No transmission or reception is performed between the MT and the UE.

[0203] Figure 13 is a diagram comparing the operation of NCR and existing RF repeaters.

[0204] Reference Figure 13 (a) In the case of the existing RF repeater, beamforming in all directions or in a fixed direction is performed. Figure 13 As shown in (b), in the NCR, the Tx / Rx beam direction of the NCR is adaptively adjusted according to the UE's position and the UE's channel condition, thereby obtaining a beamforming gain.

[0205] In existing RF repeaters, TDD systems cannot distinguish between DL and UL directions, and transmission and reception in both directions are always performed simultaneously. Alternatively, a fixed TDD configuration is applied, and switching between DL and UL directions is performed in a prescribed time pattern. On the other hand, NCRs take the TDD configuration into account and perform DL / UL switching. This allows for adaptive DL / UL operations, reducing power waste and interference caused by forwarding unnecessary signals.

[0206] Conventional RF repeaters constantly amplify and forward received signals, regardless of whether base stations or UEs are transmitting signals. This wastes power unnecessarily and increases interference to the surrounding area. NCRs perform an on / off operation, shutting down the RU when there are no signals to be forwarded to base stations or UEs, preventing unnecessary signal forwarding.

[0207] Conventional RF repeaters amplify the power of received signals at a fixed ratio before forwarding them. In the case of NCRs, when transmitting signals at unnecessarily high power, the NCR's transmit power is reduced to minimize interference with the surrounding area. When transmitting signals at low power, the NCR's transmit power is increased to ensure stable signal forwarding to the receiver.

[0208] Conventional RF repeaters operate without knowing the DL / UL time slot boundaries. On the other hand, in order to adaptively adjust beamforming, on / off, DL / UL direction, Tx power, and other functions, the NCR needs to know the DL and UL transmit / receive boundaries. Consequently, different RU operations are applied for each unit of time (e.g., time slot / symbol).

[0209] Figure 14Illustrate the links between the base station, NCR, and UE.

[0210] Reference Figure 14 , NCR includes NCR-MT (=MT) and NCR-Fwd (=RU).

[0211] The link between the base station and the NCR-MT may be referred to as a control link, the link between the base station and the NCR-Fwd may be referred to as a backhaul link, and the link between the NCR-Fwd and the UE may be referred to as an access link.

[0212] The NCR-MT is defined as a functional entity that communicates with the base station (gNB) via a control link (C-link) to exchange information (e.g., side control information). The C-link is based on the NR Uu interface.

[0213] The side control information is information used for at least NCR-Fwd control.

[0214] NCR-Fwd is defined as a functional entity that performs UL / DL RF signal amplification and forwarding between a base station and a user equipment (UE) via a backhaul link and an access link. The operation of NCR-Fwd is controlled according to side control information received from the base station.

[0215] Throughout the specification, unless otherwise specified, descriptions using the term UE also apply to NCR-MT.

[0216] The procedures for NCR-MT to perform cell search, system information acquisition, random access procedure, UCI reporting and PDCCH monitoring may be the same as those of UE. The procedures for NCR-MT to perform PDSCH reception, CSI-RS measurement and CSI determination, PUSCH transmission and SRS transmission may be the same as those of UE.

[0217] The NCR-Fwd may be sent or received only after the NCR-MT on the control link has received an indication on one or more beams to be used for transmission or reception for one or more time resources on the access link.

[0218] When the NCR-MT performs the link recovery process, the NCR-Fwd is not sent or received until the link recovery process is completed.

[0219] The contents of this disclosure can be applied to operations in an NCR. However, the contents of this disclosure can also be applied to devices other than an NCR. For example, the contents of this disclosure can be applied to perform operations in a RIS. The NCR mentioned in this disclosure can be replaced by a RIS and expanded / interpreted. In this case, the RU performs the role of forwarding signals from the base station to the UE and forwarding signals from the UE to the base station in the RIS, and the MT performs the role of receiving side control information from the base station for controlling the signal transmission of the RU.

[0220] In the present disclosure, the term network can be interpreted as being replaced by base station or CU / DU. In addition, the term base station can be interpreted as being replaced by network, CU or DU.

[0221] In the NCR, in order to forward the signals received by the RU, the RF end can adjust the transmit / receive beam direction, DL / UL direction, ON / OFF state, transmit power, etc. However, the operation of the RU cannot be determined by the NCR itself, but can be fully controlled by the base station. To this end, the MT can receive information required to control the operation of the RU (i.e., side control information) from the base station. At least some or all of this side control information can be conveyed through L1 / L2 signaling (such as DCI (e.g., DCI format 2_8) and MAC-CE).

[0222] The side control information may include, for example, all or part of the following information.

[0223] 1) Beamforming information. This refers to information about the Tx / Rx beam direction of the RU. Such information includes the beam direction of UL Tx from the base station, DL Rx from the base station, DL Tx to the UE, and / or UL Rx from the UE.

[0224] 2) Timing information to align transmission / reception boundaries of network-controlled repeaters (NCRs). This refers to the information used by the RU to align Tx / Rx time slot or symbol boundaries.

[0225] 3) Information on UL-DL TDD configuration: This indicates information about the DL / UL direction of the RU.

[0226] 4) ON-OFF information for efficient interference management and improved energy efficiency: This information indicates the ON-OFF operation of the RU.

[0227] 5) Power control information for efficient interference management. This refers to information about the RU's transmit power. Such information includes the UL transmit power to the base station and / or the DL transmit power to the UE.

[0228] Different side control information is applied to each time resource. In this case, it is necessary to indicate the side control information for each time resource.

[0229] When side control information is transmitted via MAC-CE and / or DCI, the side control information may be transmitted via different MAC-CE and / or DCI for each time resource unit. This places a burden on transmitting side control information for each time resource unit. To account for this, when side control information is transmitted once, it may indicate side control information for multiple time resource units.

[0230] In this case, although side control information for a plurality of time resource units should be determined and set in advance, efficient signaling becomes possible.

[0231] For indication of beam information applied to the access link of NCR-Fwd, periodic (semi-static) beam configuration, semi-persistent beam configuration, and aperiodic (dynamic) beam indication can be applied.

[0232] <Periodic beam configuration>

[0233] Periodic beam configuration for the access link is performed via RRC signaling. The NCR-MT may receive one or more periodic beam configurations of beam information for the access link of the NCR-Fwd.

[0234] Each periodic beam configuration consists of X forwarding resources, where X can have 1≤X≤X max range.

[0235] Each forwarding resource is composed of {beam index, time resource}. For the time resource indicated by the above "time resource", the beam indicated by the above "beam index" of the corresponding forwarding resource is applied to the access link.

[0236] Each time resource can be defined by, for example, at least {a start slot in a cycle defined as a slot offset, a start symbol within the slot defined by a symbol offset, and a duration defined by the number of symbols}. In this case, within each cycle, consecutive symbols during the "duration" starting from the "start symbol" in the "start slot" constitute the time resource.

[0237] The period information may be indicated together within the periodic beam configuration, and the period value may be commonly applied to the X forwarding resources within the periodic beam configuration.

[0238] Reference subcarrier spacing (reference SCS) information may be indicated together within a periodic beam configuration, and the reference SCS value may be commonly applied to the X forwarding resources within the periodic beam configuration.

[0239] <Semi-persistent configuration>

[0240] The semi-persistent beam configuration for the access link is performed via RRC signaling. The NCR-MT may receive one or more semi-persistent beam configurations of beam information for the access link of the NCR-Fwd.

[0241] Each semi-persistent beam configuration may consist of Z forwarding resources, where Z may have 1≤Z≤Z max range.

[0242] Each forwarding resource may be composed of {beam index, time resource}. For the time resource indicated by the above "time resource" of the forwarding resource, the beam indicated by the above "beam index" of the corresponding forwarding resource is applied to the access link.

[0243] Each time resource may be defined by at least {a starting time slot defined by a time slot offset within a cycle, a starting symbol defined by a symbol offset within a time slot, and a duration defined by a number of symbols}. In this case, within each cycle, consecutive symbols during the duration starting from the starting symbol within the starting time slot constitute a time resource.

[0244] The period information can be indicated together within a semi-persistent beam configuration. In this case, the period value can generally be commonly applied to Z (Z is a natural number) forwarding resources within the semi-persistent beam configuration. Alternatively, the period value can be set independently and applied to each forwarding resource within the semi-persistent beam configuration.

[0245] The reference subcarrier spacing (reference SCS) information can be indicated together within a periodic beam configuration, and the reference SCS value can be commonly applied to the Z forwarding resources within the periodic beam configuration. Alternatively, the reference SCS value can be independently set and applied to each forwarding resource within a semi-persistent beam configuration.

[0246] When one or more semi-persistent beam configurations are established for an access link, these configurations may be activated / deactivated via MAC-CE or DCI signaling.

[0247] For each semi-persistent beam configuration unit, the configuration may be activated / deactivated, or the index of the semi-persistent beam configuration to which activation (or deactivation) is applied may be indicated.

[0248] Typically, only one of the multiple semi-persistent beam configurations may be activated. In this case, the index of the semi-persistent beam configuration to which activation is applied may be indicated.

[0249] One or more forwarding resources can be activated within a semi-persistent beam configuration. Activation / deactivation can be indicated on a per-forwarding resource basis within a semi-persistent beam configuration. Alternatively, the index of the forwarding resource to which application activation (or application deactivation) is indicated can be indicated.

[0250] <Aperiodic Beam Indication>

[0251] Aperiodic beam indication for the access link can be performed via DCI. The NCR-MT can receive a DCI including side control information for the access link beam information of the NCR-Fwd. The NCR-MT can receive one or more beam index information applied to the access link of the NCR-Fwd via a DCI including side control information.

[0252] The DCI containing the side control information may have L max A beam indication field contains a beam index information.

[0253] The DCI including the side control information may have i)L max A time resource field includes a time resource information. ii) Or the DCI including the side control information may have a time resource field. In this case, a time resource field may include L max Time resource information.

[0254] L max Beam index information and L max Time resource information has a 1:1 mapping relationship in order. max The Lth beam index among the beam index information is applied to the Lth beam index of the access link. max The Lth time resource among the time resource information. Here, the relationship is 0≤L≤L max -1.

[0255] Each time resource may be defined by at least {a starting time slot defined by a time slot offset within a cycle, a starting symbol defined by a symbol offset within a time slot, and a duration defined by a number of symbols}. In this case, within each cycle, consecutive symbols during the duration starting from the starting symbol within the starting time slot constitute a time resource.

[0256] However, there may be cases where NCR-Fwd performs forwarding operations in the same beam direction using multiple time slot resources, such as repeated transmission of uplink channels. In this case, according to the prior art, since the time resources used for forwarding operations in each time slot must be independently indicated, signaling overhead increases.

[0257] Furthermore, when time resources for forwarding operations are mixed with resources in different directions (eg, downlink and uplink), it is unclear how they operate, which may lead to ambiguity in forwarding operations.

[0258] In the present disclosure, taking these points into consideration, a method for determining time resources to which beam indication information for an access link is applied when a network controlled repeater (NCR) operates is proposed.

[0259] For indication of beam information applied to the access link of NCR-Fwd, periodic (semi-static) beam configuration, semi-persistent beam configuration, and aperiodic (dynamic) beam indication can be applied.

[0260] The NCR-MT receives information about the time resource to which the beam index is applied along with the beam index information through the beam indication of the access link. The NCR-Fwd performs transmission / reception on the access link in the beam direction corresponding to the indicated beam index for the time resource indicated by the indicated time resource.

[0261] At this time, the specific time resource is expressed as a starting time slot, a starting symbol and / or a symbol duration, and a corresponding value can be indicated for the time resource. Upon receiving this information, the NCR determines that the symbol resources for the continuous symbol duration starting from the starting symbol resource within the starting time slot position constitute the time resource.

[0262] <Method for Setting Time Resources Including Multiple Time Slot Resources>

[0263] Considering that the time resource for transmitting a signal / channel generally consists of symbol resources within a time slot, a time resource may consist of symbol resources existing within a time slot. In other words, the symbol resources constituting the time resource do not cross the time slot boundary.

[0264] To this end, the NCR may expect that the symbol duration values ​​for the time resources will be indicated as not crossing slot boundaries.

[0265] If the symbol duration value for a time resource is indicated to exceed a slot boundary, the NCR may determine that the indication is invalid and may not apply the beam information in the time resource.

[0266] Alternatively, if the symbol duration value for the time resource is indicated to exceed the slot boundary, the NCR may determine that the symbol resources from the starting symbol resource within the starting slot to the last symbol of the corresponding slot constitute the time resource.

[0267] Furthermore, given that signals / channels such as PUSCH, PUCCH, and PDSCH can be repeatedly transmitted across multiple time slots, a time resource can be configured to include symbol resources that exist within multiple time slots. That is, the symbol resources that make up a time resource can span time slot boundaries. To this end, the symbol duration value for a time resource can be indicated as spanning a time slot boundary.

[0268] However, in general, when PUSCH, PUCCH, PDSCH, etc. are repeatedly transmitted, the time resources for transmitting them are composed of non-continuous symbol resources. For example, some continuous symbol resources within a time slot are repeatedly transmitted in units of time slots. In addition, in a TDD environment, transmission is not performed on symbol resources that are not aligned in the U / D direction. Therefore, making continuous symbol resources from a specific symbol position constitute one time resource may not be suitable for reflecting the time resources of the actual transmitted signal / channel. Taking this into account, the indicated time resources need to be configured to include non-continuous symbol resources within continuous time slot resources so that it can reflect the time resources on which the actual signal / channel is repeatedly transmitted.

[0269] In view of the above points, the present disclosure proposes the following.

[0270] NCR-MT receives time resources and beam index information from the network. NCR-Fwd performs transmission / reception in the beam direction corresponding to the beam index indicated for the access link in the symbol resources constituting the indicated time resources.

[0271] At this time, the time resource information indicating the time resource may indicate resources of a plurality of time slots to which the beam index may be applied.

[0272] For example, in addition to the starting time slot, starting symbol and / or symbol duration information, time slot duration information may also be indicated to the NCR-MT in order to indicate time resources from the network.

[0273] Figure 15 An operation method of a Network Control Repeater (NCR) including a Mobile Terminal (MT) and a Forwarding (Fwd) in a wireless communication system is illustrated.

[0274] NCR includes NCR-MT entity and NCR-Fwd entity.

[0275] Reference Figure 15 The NCR receives the beam index applied to the access link between the NCR-Fwd and the UE and the time resource information related to the beam index from the base station through the NCR-MT (S151). At this time, the time resource information notifies the resources of multiple time slots to which the beam index can be applied.

[0276] The NCR performs a forwarding operation using the beam indicated by the beam index in the time resource indicated by the time resource information via NCR-Fwd (S152).

[0277] According to an embodiment, the time resource information may include a slot offset, a slot duration, a symbol offset, and a symbol duration. In this case, the time resource information notified by the time resource information is characterized in that a symbol notified by a symbol duration from a specific symbol is included in each of the slots notified by the slot duration, a specific symbol is notified by a symbol offset from the start of the specific slot, and a specific slot is notified by a slot offset from the start of a period.

[0278] Figure 16 An example of time resources indicated by time resource information according to the present disclosure is shown.

[0279] Reference Figure 16 , NCR-MT determines that for consecutive time slot resources (162, for example, 4) of a time slot duration starting from a start time slot (161) resource, as many consecutive symbol resources as a symbol duration (164) starting from a start symbol (163) position within each time slot constitute the time resource indicated by the time resource information.

[0280] That is, when the above time resource information includes the starting time slot (161), the time slot duration (162), the starting symbol (163) and the symbol duration (164), the NCR-MT determines Figure 16 The time resource (165) is provided by the starting time slot (161), the time slot duration (162), the starting symbol (163) and the symbol duration (164).

[0281] When considering the case where DL symbols and UL symbols are mixed within a time resource in which a specific signal / channel is repeatedly transmitted as described above, or the case where flexible symbols are included, the actual time slot resource in which the signal / channel is transmitted may be composed of non-contiguous time slots. With this in mind, instead of indicating the number of time slots constituting the time resource, information about a list of time slots constituting the time resource may be indicated together to indicate a time resource consisting of non-contiguous time slot resources. In other words, a time resource consisting of non-contiguous time slots can be expressed by indicating a plurality of time slot resources constituting the time resource.

[0282] Depending on the implementation, the time resource may be represented by a starting slot list (or also referred to as a slot offset list), a starting symbol and / or a symbol duration, and these values ​​may be indicated for the time resource. In this case, the starting slot list may refer to a set of starting slots.

[0283] At this time, the time resource information can be expressed as including a slot offset list, a symbol offset, and a symbol duration. In this case, the time resource indicated by the time resource information is a symbol indicated by a symbol duration from a specific symbol, the specific symbol is indicated by a symbol offset (i.e., a starting symbol) from the starting point of each slot (i.e., each starting slot), and the starting point of each slot is indicated by each slot offset included in the slot offset list.

[0284] NCR-MT can receive time resource and beam index information from the network and control NCR-Fwd based on this. Thus, NCR-Fwd performs transmission / reception in the beam direction corresponding to the beam index indicated for the access link in the symbol resources constituting the indicated time resource.

[0285] As described above, information about the starting time slot list, starting symbol and / or symbol duration may be indicated to the NCR-MT in order to indicate time resources from the network.The starting time slot list may include information about one or more starting time slots.

[0286] The NCR-MT may determine that continuous symbol resources as many as the symbol duration from the start symbol position within each slot constitute time resources for slot resources included in the start slot list.

[0287] Thus, even if the actual signal / channel is repeatedly transmitted as non-contiguous symbol resources, this resource can be reflected by the time resource configuration.

[0288] In the above method, tdd-UL-DL-ConfigurationCommon (which can be a higher layer message, such as system information, RRC message, or RRC information element) and another tdd-UL-DL-ConfigurationDedicated (which can be a higher layer message, RRC message, or RRC information element) can be provided to the NCR via the NCR-MT. tdd-UL-DL-ConfigurationCommon can provide cell-specific TDD UL / DL configuration. tdd-UL-DL-ConfigurationDedicated can provide NCR-specific TDD UL / DL configuration.

[0289] NCR-Fwd can perform a reception operation on the backhaul link and a transmission operation on the access link only on symbols indicated as downlink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated.

[0290] NCR-Fwd may perform a reception operation on the access link and a transmission operation on the backhaul link only on symbols indicated as uplink by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated.

[0291] When the NCR receives signals on both the control link and the backhaul link in a symbol set, the TCI state used for backhaul link reception and the TCI state used for control link reception in the symbol set are the same. When the NCR transmits signals on both the control link and the backhaul link in the symbol set, the spatial filter used for backhaul link transmission and the spatial filter used for control link transmission in the symbol set are the same.

[0292] In the case that the NCR does not receive signals on the control link and the backhaul link at the same time,

[0293] i) If the NCR does not support determining the TCI state for reception on the backhaul link based on the TCI state indication of the serving cell, or if the NCR has not received the TCI state indication for reception on the backhaul link, then if the NCR has not received the integrated TCI state indication for reception of the NCR-MT, the reception on the backhaul link uses the same QCL parameters as the QCL parameters for PDCCH reception in the CORESET with the lowest controlResourceSetId. Otherwise, the reception on the backhaul link uses the QCL parameters provided in the integrated TCI state indication for reception of the NCR-MT.

[0294] ii) Otherwise, reception on the backhaul link uses the QCL parameters provided by the TCI status of the MAC CE.

[0295] In the case that the NCR does not send signals on the control link and the backhaul link at the same time,

[0296] i) If the NCR does not support spatial filter determination for transmissions on the backhaul link based on the integrated TCI state or SRI (SRS Resource Indicator) indication of the serving cell, or if the NCR-MT does not receive an integrated TCI state or SRI indication for spatial filter determination for transmissions on the backhaul link, then if the NCR does not receive an integrated TCI state indication for transmissions of the NCR-MT, the transmissions on the backhaul link use the same spatial filter as the spatial filter associated with the PUCCH resource with the smallest pucch-ResourceId in the PUCCH-ResourceSet. Otherwise, the transmissions on the backhaul link use the spatial filter corresponding to the integrated TCI state indicated by the NCR-MT for the transmissions.

[0297] ii) Otherwise, the transmission on the backhaul link uses the spatial filter corresponding to the integrated TCI state or SRI provided by the MAC CE.

[0298] NCR-Fwd uses the same beam for both transmission and reception on the access link during each time resource associated with the beam.

[0299] A list of resource sets for transmission or reception on the access link can be provided to the NCR via ncr-PeriodicFwdResourceSetToAddModList. In the list of resource sets, one resource set is provided by NCR-PeriodicFwdResourceSet and appears with a period given by ncr-periodic. Within the resource set, one resource is provided by NCR-PeriodicFwdResource, which includes a pair of a time resource provided by ncr-PeriodicTimeResource and a beam with an index provided by ncr-beamIndex, i.e., a (time resource, beam) pair. At this time, the time resource starts from a specific time slot that is offset by slotOffsetPeriodic time slots from the start of the period of the resource set and from a symbol that is offset by symbolOffset from the start of the specific time slot, and can have a duration provided by durationInSymbols for the SCS provided by ncr-referenceSCS, and the resources within the specific time slot can be included in each time slot in the time slot indicated by slotduration (the above-mentioned time slot duration) or in each time slot indicated by each time slot offset included in the time slot offset list.

[0300] A list of resource sets used for transmission or reception on the access link may be provided to the NCR through ncr-SemiPertantFwdResourceSetToAddModListNCR, and the MAC CE command may indicate the resource sets that the NCR will use or stop using.

[0301] NCR can use or stop using time slot k+3N slot subframe , μ The resource set starting from the first time slot after k, where k is the time slot in which the NCR-MT sends PUCCH and HARQ-ACK information related to the PDSCH providing the MAC CE command, and μ is the SCS configuration for PUCCH transmission.

[0302] The resource set may be provided by NCR-SemiPersistentFwdResourceSet and may occur with a periodicity provided by ncr-periodicity. The resources of the resource set may be provided by NCR-SemiPersistentFwdResource and may include a pair of time resources provided by ncr-SemiPersistentTimeResource and a beam with an index provided by ncr-beamIndex. Here, beamIndex may be updated with a MAC CE command. The time resources provided by ncr-SemiPersistentTimeResource may be updated with a reference to Figure 15 The described method indicates resources of multiple time slots.

[0303] The above-mentioned time resources may start at a specific time slot that is offset by slotOffsetSemiPerpetual time slots from the start of the period of the resource set, may start at a symbol that is offset by symbolOffset from the start of the specific time slot, and may have a duration provided by durationInSymbols for the SCS provided by ncr-referenceSCS, and the resources within the specific time slot may be included in each time slot in the time slot indicated by slotduration (the above-mentioned time slot duration) or in each time slot indicated by each time slot offset included in the time slot offset list.

[0304] In an embodiment, the NCR-MT may be configured to monitor the PDCCH according to the USS set to detect DCI format 2_8 with a CRC scrambled by the NCR-RNTI. The time resource and corresponding beam index for transmission or reception of the access link may be indicated by the corresponding field of DCI format 2_8.

[0305] If the NCR detects two or more DCI formats 2_8 indicating beam indices for overlapping time resources in a symbol set, the NCR uses the beam index indicated by the DCI format 2_8 detected by the NCR-MT in the most recent PDCCH monitoring occasion for the symbol set.

[0306] The time resource starts at the symbol offset symbolOffset from the start of a specific time slot (the specific time slot is offset from the reference time slot by slotOffsetAperiodic time slots), has a duration provided by durationInSymbols for the SCS provided by ncr-referenceSCS, and the resources within the specific time slot can be included in each time slot in the time slot indicated by slotduration (the above-mentioned time slot duration) or in each time slot indicated by each time slot offset included in the time slot offset list. The reference time slot is the time slot after the time slot in which the PDCCH providing DCI format 2_8 is received, and can be specified as how many time slots after the time slot in which the PDCCH is received.

[0307] If i) a first time resource provided by NCR-SemiPersistentFwdResourceSet is indicated by a MAC CE command and the first time resource is related (associated) with a first beam index, and ii) a second time resource is provided by NCR-PemiodicFwdResourceSet and the second time resource is related to a second beam index, and iii) if the first time resource overlaps with the second time resource in a symbol set, the NCR applies the first beam index to transmission or reception on the access link in the symbol set.

[0308] If i) the first time resource is provided by NCR-PeriodicFwdResourceSet or NCR-SemiPersistentFwdResourceSet and the first time resource is associated with the first beam index, and ii) the second time resource is indicated by DCI format 2_8 and the second time resource is associated with the second beam index provided by DCI format 2_8, and iii) if the first time resource overlaps with the second time resource in the symbol set, NCR i) if priorityFlag is included in NCR-PeriodicFwdResourceSet or NCR-SemiPersistentFwdResourceSet, the first beam index is applied, and ii) if priorityFlag is not included in NCR-PeriodicFwdResourceSet or NCR-SemiPersistentFwdResourceSet, the second beam index is applied, for transmission or reception on the access link in the symbol set.

[0309] NCR does not expect that overlapping time resources provided by NCR-PeriodicFwdResourceSet or NCR-SemiPersistentFwdResourceSet will be associated with different beam indices.

[0310] Furthermore, if the time resource indicated by the time resource information (e.g., ncr-PeriodicTimeResource or SemiPersistentTimeResource, but not limited thereto) includes multiple symbols, NCR-Fwd may not perform a forwarding operation on a symbol semi-statically set as a flexible symbol among the multiple symbols.

[0311] <Method for determining time resources in consideration of DL / UL directions>

[0312] In a TDD environment, the DL / UL direction for the backhaul link and access link is determined as follows:

[0313] When the NCR-MT determines that a specific symbol is a DL symbol through the semi-static TDD configuration (TDD-UL-DL-ConfigCommon and / or TDD-UL-DL-ConfigDedicated) from the serving cell via the control link (C-link), it determines that the backhaul link and the access link operate as DL in that symbol.

[0314] When the NCR-MT determines that a specific symbol is a UL symbol through the semi-static TDD configuration (TDD-UL-DL-ConfigCommon and / or TDD-UL-DL-ConfigDedicated) from the serving cell via the control link, it determines that the backhaul link and the access link operate as UL in the symbol.

[0315] If NCR-MT determines that a specific symbol is a flexible symbol through the semi-static TDD configuration (TDD-UL-DL-ConfigCommon and / or TDD-UL-DL-ConfigDedicated) from the serving cell via the control link, it determines that the backhaul link and access link are operated as OFF in this symbol. In other words, it determines that NCR-Fwd does not perform forwarding operations in this symbol.

[0316] At this time, if the NCR-MT determines that the access link operates as a DL in a specific time resource, it determines that the beam index applied to the time resource means a DL beam. If the NCR-MT determines that the access link operates as a UL in a specific time resource, it determines that the beam index applied to the time resource means a UL beam.

[0317] Through the above operations, the NCR can perform a DL operation, a UL operation, or an OFF operation on each symbol of the backhaul link and the access link.

[0318] Figure 17 A case is illustrated in which symbols constituting one time resource include symbols for performing a DL operation and symbols for performing a UL operation.

[0319] Reference Figure 17 , a time resource for access link beam indication may consist of time resources spanning multiple time slots. In this case, Figure 16 As shown in (a) or (b), symbols for performing DL operations and symbols for performing UL operations may both be included in symbols constituting one time resource.

[0320] In this case, although the time resource is set to apply a specific beam index, the beam application operation may be ambiguous from the perspective of the NCR because the time resource includes both DL resources and UL resources.

[0321] Generally speaking, when DL / UL signals / channels are repeatedly transmitted using multiple time slot resources, if at least one symbol among the symbol resources allocated for DL / UL signal / channel transmission in a specific time slot cannot be used for DL / UL signal / channel transmission, the UE determines not to transmit the DL / UL signal / channel in the corresponding time slot. Therefore, when time resources include both DL resources and UL resources, it may be difficult to assume that all symbols are used for transmitting and receiving signals / channels.

[0322] Figure 18 The case where a symbol for performing an OFF operation is included in symbols constituting one time resource is exemplified.

[0323] Reference Figure 18 (a) or (b), the symbol performing the OFF operation can be included in the symbols constituting a time resource.

[0324] In this case, although the time resources are set to apply a specific beam index, the beam application operation may be ambiguous from the perspective of the NCR because the time resources include resources for which the NCR does not perform a forwarding operation.

[0325] In view of the above circumstances, the present disclosure proposes the following.

[0326] NCR-MT receives time resource and beam index information from the network. Thus, NCR-Fwd performs transmission / reception in the beam direction corresponding to the beam index indicated for the access link in the symbol resources constituting the indicated time resource.

[0327] At this time, the NCR determines whether to perform a DL operation, a UL operation, or an OFF operation on a symbol included in a specific time resource indicated from the network.

[0328] When the NCR-MT determines that a specific symbol is a DL symbol through the semi-static TDD configuration (TDD-UL-DL-ConfigCommon and / or TDD-UL-DL-ConfigDedicated) from the serving cell via the control link, it determines that the backhaul link and the access link operate as DL in the symbol.

[0329] When the NCR-MT determines that a specific symbol is a UL symbol through the semi-static TDD configuration (TDD-UL-DL-ConfigCommon and / or TDD-UL-DL-ConfigDedicated) from the serving cell via the control link, it determines that the backhaul link and the access link operate as UL in the symbol.

[0330] If the NCR-MT determines that a specific symbol is a flexible symbol based on the semi-static TDD configuration (TDD-UL-DL-ConfigCommon and / or TDD-UL-DL-ConfigDedicated) from the serving cell via the control link, it determines that the backhaul link and access link operations are OFF in this symbol. In other words, it determines that the NCR-Fwd does not perform forwarding operations in this symbol.

[0331] At this time, if the NCR determines that the access link operates as a DL in a specific time resource, the beam index it determines to apply to the time resource means a DL beam. When the NCR determines that the access link operates as a UL in a specific time resource, the beam index it determines to apply to the time resource means a UL beam.

[0332] At this time, if both the symbol determined as a DL operation and the symbol determined as a UL operation are included in the symbols included in the specific time resource, at least one of the following methods may be applied.

[0333] Method 1.

[0334] The NCR determines that the beam index indicates a DL beam in the symbol determined as a DL operation within the time resource, and performs a DL transmission operation (forwarding operation) in the DL beam direction corresponding to the beam index through the access link of the NCR-Fwd. In addition, the NCR determines that the beam index indicates a UL beam in the symbol determined as a UL operation within the time resource, and performs a UL reception operation (forwarding operation) in the UL beam direction corresponding to the beam index through the access link of the NCR-Fwd.

[0335] Method 2.

[0336] When the NCR determines that the first symbol constituting the time resource is to be operated as DL in the symbol, it determines that only the symbol determined to be operated as DL among the symbols constituting the time resource is included in the time resource, and the other symbols are determined to be excluded from the symbol resources constituting the time resource.

[0337] Alternatively, symbols determined to be operated as UL among symbols constituting the time resource are determined to be excluded from the symbol resources constituting the time resource.

[0338] Figure 19 The operation of the NCR when symbols determined as UL operation are included among symbols constituting time resources is illustrated.

[0339] Reference Figure 19 (a), the first symbol constituting the time resource is operated as DL. In addition, among the symbols constituting the time resource, the symbols constituting the UL operation are included. In this case, as Figure 19 As shown in (b), among the symbols constituting the time resource, the symbol resource indicating UL is excluded from the time resource.

[0340] When the NCR determines that the first symbol constituting the time resource is to be operated as UL in the symbol, it determines that only the symbol determined to be operated as UL among the symbols constituting the time resource is included in the time resource, and the other symbols are determined to be excluded from the symbol resources constituting the time resource.

[0341] Alternatively, symbols determined to be operated as DL among symbols constituting the time resource are determined to be excluded from the symbol resources constituting the time resource.

[0342] That is, when the time resource indicated by the time resource information received by the NCR includes a plurality of symbols, the NCR-Fwd may not perform a forwarding operation on a symbol having a direction different from the direction indicated by the first symbol of the first time slot of the time resource among the plurality of symbols. In this case, the direction indicated by the first symbol of the first time slot may be downlink or uplink.

[0343] Method 3.

[0344] If the NCR determines that the first symbol constituting a time resource is to be used for a DL operation, it determines that the consecutive symbols starting from the first symbol, which are determined to be used for a DL operation, are included in the time resource. Among the symbols constituting the time resource, the symbol located at the front position and subsequent symbols are determined to be excluded from the symbol resources constituting the time resource. In other words, if a specific symbol constituting the time resource is determined not to be used for a DL operation, the subsequent symbols are determined to be excluded from the symbol resources constituting the time resource.

[0345] Alternatively, among the symbols constituting the time resource, the symbol located at the front position and the symbols following it among the specific symbols for UL operation are determined to be excluded from the symbol resources constituting the time resource. That is, if the specific symbol among the symbols constituting the time resource is determined to be a symbol for UL operation, the symbols following it are determined to be excluded from the symbol resources constituting the time resource.

[0346] Figure 20 is another example of the operation of the NCR when a symbol determined as a UL operation is included among symbols constituting the time resource.

[0347] Reference Figure 20 (a), the first symbol constituting the time resource is operated as DL. In addition, the symbols constituting the time resource include symbols operating as UL. In this case, as in Figure 20 In (b), the symbol resource indicated as UL and subsequent symbols among the symbols constituting the time resource are excluded from the time resource.

[0348] If the NCR determines that the first symbol constituting a time resource is to be used as a UL operation within that symbol, it determines that the consecutive symbols starting from the first symbol, which are determined to be used as UL operations, are included in the time resource. Among the symbols constituting the time resource, the symbols starting from and following the first symbol, which are not to be used as UL operations, are determined to be excluded from the symbol resources constituting the time resource. In other words, if a specific symbol, among the symbols constituting the time resource, is determined not to be used as a UL operation symbol, the subsequent symbols are determined to be excluded from the symbol resources constituting the time resource.

[0349] Alternatively, among the symbols constituting the time resource, symbols starting from and following the symbol located at the front position among the symbols for DL ​​operations are determined to be excluded from the symbol resources constituting the time resource. That is, if a specific symbol among the symbols constituting the time resource is determined to be a symbol for DL ​​operations, the subsequent symbols are determined to be excluded from the symbol resources constituting the time resource.

[0350] At this time, if a symbol determined to be operated as OFF is included with respect to symbols included in a specific time resource, at least one of the following methods may be applied.

[0351] Method a.

[0352] The NCR determines to exclude symbols determined to be operated OFF among symbols constituting the time resource from the symbol resources constituting the time resource.

[0353] Method b.

[0354] When the NCR determines that a specific symbol among the symbols constituting the time resource is a symbol operating as OFF, it determines to exclude the subsequent symbols from the symbol resources constituting the time resource.

[0355] Through the present disclosure, even if a time resource includes symbols performing different operations (DL operation, UL operation, OFF operation) in a TDD environment, the NCR determines the time resource to which a specific beam index is applied without ambiguity.

[0356] That is, when time resources for forwarding operations are mixed with resources in different directions (eg, downlink and uplink), ambiguity in forwarding operations can be prevented by clearly specifying how to operate.

[0357] Figure 21 An operation method of an NCR in a wireless communication system including a base station, an NCR, and a UE is illustrated. Figure 21 Illustrate when the application Figure 15 The method is signaling between the base station, NCR and UE.

[0358] Reference Figure 21 , the NCR (more specifically, NCR-MT) receives time resource information indicating resources of a plurality of time slots and beam index information indicating beams related (associated) with the resources of the plurality of time slots from the base station (S211).

[0359] The NCR (more specifically, NCR-Fwd) performs a forwarding operation by applying the beam indicated by the beam index to resources of a plurality of time slots (S212). The NCR-Fwd may perform the operation under the control of the NCR-MT.

[0360] According to the present disclosure, when NCR-Fwd performs a forwarding operation in the same beam direction through multiple time slot resources, signaling overhead required to indicate the forwarding operation in multiple time slots can be reduced.

[0361] Figure 22 Wireless devices suitable for use in this specification are exemplified.

[0362] Reference Figure 22, the first wireless device 100 and the second wireless device 200 can transmit / receive wireless signals through various wireless access technologies (e.g., LTE, NR).

[0363] The first wireless device 100 includes at least one processor 102 and at least one memory 104, and may also 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 descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signals, and may then 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 pieces of information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing part or all of the processing controlled by the processor 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flows 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 transmit 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.

[0364] Processor 102 may be included in a network controlled relay (NCR), where the NCR includes an NCR-mobile terminal (MT) and an NCR-forwarding device (Fwd). Processor 102 performs operations in which the NCR-MT receives, from a base station, a beam index applied to an access link between the NCR-Fwd and a user equipment (UE) and time resource information associated with the beam index, and the NCR-Fwd performs a forwarding operation using the beam indicated by the beam index within the time resource indicated by the time resource information. As described above, the time resource information indicates resources of multiple time slots to which the beam index can be applied.

[0365] The second wireless device 200 includes at least one processor 202 and at least one memory 204, and may also 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 descriptions, functions, processes, proposals, methods, and / or operational flows disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signals, and may 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 pieces of information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing part or all of the processing controlled by the processor 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operational flows 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 transmit 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.

[0366] Processor 202 may be included in a base station. Processor 202 transmits a beam index applied to an access link between a network controlled relay-mobile terminal (NCR-MT) and an NCR-forwarding (NCR-Fwd) of an NCR, including an NCR-MT and an NCR-Fwd, and time resource information associated with the beam index to be used for an access link between the NCR-Fwd and a user equipment (UE). Processor 202 also receives a signal from the NCR-Fwd based on the beam indicated by the beam index in the time resource indicated by the time resource information. The time resource information indicates resources of multiple time slots to which the beam index can be applied.

[0367] The hardware elements of the wireless devices 100 and 200 are described in detail below. At least one protocol layer may be implemented by, but is not limited to, at least one processor 102 and 202. For example, at least one processor 102 and 202 may implement at least one layer (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP layers). The 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 descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein. The at least one processor 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein. The at least one processor 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed herein, and may provide the signals 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 descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed herein.

[0368] The at least one processor 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The 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 the at least one processor 102 and 202. The one or more processors 102 and 202 may be implemented as at least one computer-readable medium (CRM) including instructions executed by the at least one processor.

[0369] 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. The firmware or software configured to execute 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 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.

[0370] At least one memory 104 and 204 can be connected to at least one processor 102 and 202 and can store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The at least one memory 104 and 204 can be configured as ROM, RAM, EPROM, flash memory, hard drive, register, cache, computer-readable storage medium, and / or a combination thereof. The at least one memory 104 and 204 can be located inside and / or outside the at least one processor 102 and 202. In addition, the at least one memory 104 and 204 can be connected to the at least one processor 102 and 202 via various technologies such as wired or wireless connections.

[0371] At least one transceiver 106 or 206 can transmit user data, control information, radio signals / channels, and the like as described in the methods and / or operational flowcharts disclosed herein to at least one different device. At least one transceiver 106 or 206 can receive user data, control information, radio signals / channels, and the like as described in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein from at least one different device. For example, at least one transceiver 106 or 206 can be connected to at least one processor 102 or 202 and can transmit and receive radio signals. For example, at least one processor 102 or 202 can control at least one transceiver 106 or 206 to transmit user data, control information, or radio signals to at least one different device. Additionally, at least one processor 102 or 202 can control at least one transceiver 106 or 206 to receive user data, control information, or radio signals from at least one different device. At least one transceiver 106 and 206 can be connected to at least one antenna 108 and 208 and can be configured to transmit or receive user data, control information, radio signals / channels, etc. mentioned in the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed herein through at least one antenna 108 and 208. In this document, at least one antenna can be multiple physical antennas or multiple logical antennas (e.g., antenna ports). At least one transceiver 106 and 206 can convert received radio signals / channels from RF band signals to baseband signals so that the received user data, control information, radio signals / channels, etc. can be processed using at least one processor 102 and 202. At least one transceiver 106 and 206 can convert user data, control information, radio signals / channels, etc. processed using at least one processor 102 and 202 from baseband signals to RF band signals. To this end, at least one transceiver 106 and 206 can include (analog) oscillators and / or filters.

[0372] Figure 23 An example of the structure of the signal processing module is shown in FIG. Here, the signal processing can be performed in Figure 22 is executed in processors 102 and 202.

[0373] Reference Figure 23 , a transmitting device in a UE or a 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.

[0374] 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 as a data block provided by the MAC layer.

[0375] The modulator 302 can modulate the scrambled bits into complex-valued modulation symbols. 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 diagram. 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 referred to as a modulation mapper.

[0376] The complex-valued modulation symbols may be mapped to one or more transmission layers by a layer mapper 303. The complex-valued modulation symbols on each layer may be mapped by an antenna port mapper 304 for transmission on an antenna port.

[0377] Each resource block mapper 305 can map the complex-valued modulation symbols for each antenna port to appropriate resource elements in a virtual resource block allocated for transmission. The resource block mapper can map the virtual resource blocks to physical resource blocks according to an appropriate mapping scheme. The resource block mapper 305 can allocate the complex-valued modulation symbols for each antenna port to appropriate subcarriers and multiplex the complex-valued modulation symbols according to users.

[0378] Each signal generator 306 can modulate complex-valued modulation symbols, i.e., antenna-specific symbols, 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 an IFFT (Inverse Fast Fourier Transform) on the antenna-specific symbols and insert a CP (Cyclic Prefix) into the time-domain symbols that have undergone the IFFT. The OFDM symbols undergo digital-to-analog conversion and up-conversion before being transmitted to a receiving device via each transmit antenna. The signal generator may include an IFFT module, a CP insertion unit, a digital-to-analog converter (DAC), and an up-converter.

[0379] Figure 24 Another example of the structure of the signal processing module in the transmitting device is shown. Figure 22 Signal processing is performed in a processor of a UE / BS such as the processors 102 and 202 of the UE / BS.

[0380] Reference Figure 24 , a transmitting device in a UE or a BS (e.g., a processor, a processor and a memory, or a processor and a transceiver) 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.

[0381] The sending device may scramble the coded bits in the codeword through the corresponding scrambler 401 and then send the scrambled coded bits through the physical channel.

[0382] The scrambled bits are modulated into complex-valued modulation symbols by the modulator 402. The modulator can modulate the scrambled bits according to a predetermined modulation scheme to arrange the complex-valued modulation symbols representing the position on the signal constellation diagram. The modulation scheme is not limited, and the encoded data can be modulated using π / 2-BPSK (π / 2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying), or m-QAM (m-Quadrature Amplitude Modulation).

[0383] The complex-valued modulation symbols may be mapped to one or more transmission layers by a layer mapper 403 .

[0384] The complex-valued modulation symbols on each layer may be precoded by the precoder 404 so as to be transmitted 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 transform precoding. The precoder 404 may process the complex-valued modulation symbols according to MIMO using multiple transmit antennas to output antenna-specific symbols and allocate 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.

[0385] Each resource block mapper 405 maps the complex-valued modulation symbols for each antenna port to the appropriate resource elements in the virtual resource block allocated for transmission.

[0386] The resource block mapper 405 may allocate complex-valued modulation symbols to appropriate subcarriers and multiplex the complex-valued modulation symbols according to users.

[0387] Each signal generator 406 can modulate the complex-valued modulation symbols 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 an IFFT (Inverse Fast Fourier Transform) on the antenna-specific symbols and insert a CP (Cyclic Prefix) into the time-domain symbols that have undergone the IFFT. The OFDM symbols undergo digital-to-analog conversion and up-conversion before being transmitted to the receiving device via each transmit antenna. The signal generator 406 may include an IFFT module, a CP insertion unit, a digital-to-analog converter (DAC), and an up-converter.

[0388] The signal processing process of the receiving device may be the inverse process of the signal processing process of the transmitting device. Specifically, the processor of the transmitting device decodes and demodulates the RF signal received through the antenna port of the transceiver. The receiving device may include multiple receiving antennas, and the signals received by the receiving antennas are restored to baseband signals, which are then multiplexed and demodulated according to MIMO to restore them to data strings intended to be sent by the transmitting device. The receiving device may include: a signal recovery unit that restores the received signal to a baseband signal; a multiplexer that is used to combine and multiplex the received signals; and a channel demodulator that is used to demodulate the multiplexed signal string into corresponding codewords. The signal recovery unit, the multiplexer, and the channel demodulator may be configured as an integrated module or an independent module for performing their functions. More specifically, the signal recovery unit may include: an analog-to-digital converter (ADC) for converting an analog signal into a digital signal; a CP removal unit for removing the CP from the digital signal; a FET module for applying an FFT (Fast Fourier Transform) to the CP-removed signal to output a frequency domain signal; and a resource element demapper / equalizer for restoring the frequency domain symbols into antenna-specific symbols. The antenna-specific symbols are restored to a transmission layer by a multiplexer, and the transmission layer is restored to a codeword intended to be transmitted by the transmitting device by a channel demodulator.

[0389] Figure 25 An example of a wireless communication device according to an implementation example of the present disclosure is illustrated.

[0390] Reference Figure 25 , a wireless communication device (e.g., UE) may include at least one of 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.

[0391] The processor 2310 can implement the functions, processes, and methods described in this specification. Figure 25 The processor 2310 in may be Figure 22 Processors 102 and 202 in.

[0392] 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. Figure 25 The memory 2330 in may be Figure 22 Memories 104 and 204 in.

[0393] The user can enter various types of information, such as a phone number, using various techniques, such as pressing buttons on the keypad 2320 or activating voice input using the microphone 2350. The processor 2310 can receive and process the user information and perform appropriate functions, such as placing a call using the entered phone number. In some scenarios, data can be retrieved from the SIM card 2325 or the memory 2330 to perform the appropriate function. In some scenarios, the processor 2310 can display various types of information and data on the display 2315 for the user's convenience.

[0394] The transceiver 2335 is connected to the processor 2310 and transmits and / or receives RF signals. The processor can control the transceiver to initiate 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 transmitting 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 the signal and convert it to baseband frequency for processing by the processor. The signal can be processed using various techniques, such as conversion into audible or readable information, for output through the speaker 2345. Figure 23 The transceiver in can be Figure 20 The transceivers 106 and 206 in FIG.

[0395] Although Figure 25 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.

[0396] Figure 25 is an example of an implementation method for UE, and the implementation example of the present disclosure is not limited thereto. UE does not necessarily need to include Figure 25That is, some of the components (e.g., keyboard 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.

[0397] Figure 26 Another example of a wireless device is shown.

[0398] Reference Figure 26 , a wireless device may include at least one processor 102 , 202 , at least one memory 104 , 204 , at least one transceiver 106 , 206 , and one or more antennas 108 , 208 .

[0399] Figure 22 Examples of wireless devices described in Figure 26 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 Figure 22 are separate, and in Figure 26 In the example of FIG, the memories 104 and 204 are included in the processors 102 and 202. That is, the processor and the memory may constitute a chipset.

[0400] Figure 27 Another example of a wireless device applied to this specification is shown. The wireless device can be implemented in various forms according to use cases / services.

[0401] Reference Figure 27 , the wireless devices 100 and 200 may correspond to Figure 22 The wireless device 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 storage unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 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, the transceiver 114 may include Figure 22The control unit 120 is electrically connected to the communication unit 110, the storage unit 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the storage unit 130. In addition, the control unit 120 can transmit information stored in the storage unit 130 to the outside (e.g., other communication devices) via the communication unit 110 via a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 via a wireless / wired interface in the storage unit 130.

[0402] The additional component 140 may be configured in various ways depending on the type of wireless device. For example, the additional component 140 may include at least one of a power 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 without limitation: a robot ( Figure 28 100a), vehicles ( Figure 28 100b-1 and 100b-2), XR devices ( Figure 28 100c), handheld device ( Figure 28 100d), household appliances ( Figure 28 100e), IoT devices ( Figure 28 100f), digital broadcast UE, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Figure 28 400), BS( Figure 28 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0403] exist Figure 27In the wireless devices 100 and 200, all of the various elements, components, units / parts, and / or modules can be connected to each other via a wired interface, or at least a portion thereof can be wirelessly connected via the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 can be connected via a wired interface, and the control unit 120 and the first unit (e.g., 130 and 140) can be wirelessly connected via the communication unit 110. In addition, each element, component, unit / part, and / or module within the wireless devices 100 and 200 can also include one or more elements. For example, the control unit 120 can be constructed by a collection of one or more processors. For example, the control unit 120 can be constructed by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. For another example, the storage unit 130 can be constructed 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.

[0404] Figure 28 The communication system 1 applied to this specification is exemplified.

[0405] Reference Figure 28, the communication system 1 applied to the present specification includes a wireless device, a base station (BS) and a network. Herein, the wireless device refers to a device that performs communication using a radio access technology (RAT) (for example, 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, vehicles 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 inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (for example, 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 smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. Handheld devices may include smartphones, smart pads, 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, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0406] Wireless devices 100a to 100f can connect to network 300 via BS 200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS 200 / network 300, wireless devices 100a to 100f can perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). In addition, IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0407] Wireless communication / connection 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. In this article, wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access and backhaul (IAB)). The wireless device and the BS / wireless device can transmit / receive radio signals to / from each other through the wireless communication / connection 150a and 150b. For example, the wireless communication / connection 150a and 150b can transmit / 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 transmitting / receiving radio signals can be performed based on various proposals of the present disclosure.

[0408] 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 in traditional cellular bands; when the SCS is 30kHz / 60kHz, it supports dense cities, lower latency and wider carrier bandwidth; when the SCS is 60kHz or higher, it supports bandwidth greater than 24.25GHz to overcome phase noise.

[0409] The NR frequency band can be defined as two types of frequency ranges (FR1 and FR2). The value of the frequency range can be changed. For example, the two types of frequency ranges (FR1 and FR2) can be as shown in Table 5. For ease of description, FR1 in the frequency range used 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).

[0410] [Table 5]

[0411] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0412] As illustrated above, the value of the frequency range of the NR system can be changed. For example, FR1 can include a frequency band from 410 MHz to 7125 MHz as shown in Table 6 below. That is, FR1 can include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or larger. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or larger included in FR1 can include an unlicensed frequency band. The unlicensed frequency band can be used for various purposes, for example, for communication of vehicles (e.g., autonomous driving).

[0413] [Table 6]

[0414] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0415] 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 operating a network controlled repeater (NCR) in a wireless communication system, wherein the NCR comprises an NCR-mobile terminal (MT) and an NCR-forwarding device (Fwd), the method comprising the following steps: The NCR-MT receives, from a base station, a beam index applied to an access link between the NCR-Fwd and a user equipment UE and time resource information related to the beam index; as well as The NCR-Fwd performs a forwarding operation using the beam notified by the beam index in the time resource notified by the time resource information, The time resource information notifies resources of multiple time slots to which the beam index can be applied.

2. The method according to claim 1, wherein The time resource information includes a time slot offset, a time slot duration, a symbol offset, and a symbol duration.

3. The method according to claim 2, wherein: The time resource notified by the time resource information is characterized in that: a symbol notified by the symbol duration from a specific symbol is included in each of the time slots notified by the time slot duration, the specific symbol is notified by the symbol offset from the start of a specific time slot, and the specific time slot is notified by the time slot offset from the start of a specific period.

4. The method according to claim 1, wherein The time resource information includes a slot offset list, a symbol offset, and a symbol duration.

5. The method according to claim 4, wherein A symbol informed by the symbol duration from a specific symbol informed by the symbol offset from the start of each slot is included in each slot informed by each slot offset included in the slot offset list.

6. The method according to claim 1, wherein Based on the time resource notified by the time resource information including a plurality of symbols, the NCR-Fwd skips a forwarding operation on a symbol having a direction different from a direction notified by a first symbol of a first slot of the time resource among the plurality of symbols.

7. The method according to claim 6, wherein: The direction notified by the first symbol of the first time slot is downlink or uplink.

8. The method according to claim 1, wherein Based on the time resource notified by the time resource information including a plurality of symbols, the NCR-Fwd skips a forwarding operation on a symbol semi-statically configured as a flexible symbol among the plurality of symbols.

9. A network control repeater NCR, the NCR comprising an NCR-mobile terminal MT and an NCR-forwarding Fwd, the NCR comprising: at least one transceiver; at least one memory; as well as at least one processor operatively coupled to the at least one memory and the at least one transceiver, The at least one processor performs operations, the operations comprising: The NCR-MT receives, from a base station, a beam index applied to an access link between the NCR-Fwd and a user equipment UE and time resource information related to the beam index; and The NCR-Fwd performs a forwarding operation using the beam notified by the beam index in the time resource notified by the time resource information, The time resource information notifies resources of multiple time slots to which the beam index can be applied.

10. A network control repeater (NCR) device, the NCR comprising an NCR-mobile terminal (MT) and an NCR-forwarding device (Fwd), the device comprising: at least one memory; as well as at least one processor operatively coupled to the at least one memory, The at least one processor performs operations, the operations comprising: The NCR-MT receives, from a base station, a beam index applied to an access link between the NCR-Fwd and a user equipment UE and time resource information related to the beam index; and The NCR-Fwd performs a forwarding operation using the beam notified by the beam index in the time resource notified by the time resource information, The time resource information notifies resources of multiple time slots to which the beam index can be applied.

11. A method for operating a base station in a wireless communication system, the method comprising the steps of: Sending a beam index applied to an access link between the NCR-Fwd and a user equipment UE and time resource information related to the beam index to the NCR-MT of the NCR including the network control relay NCR-mobile terminal MT and the NCR-forwarding Fwd; as well as receiving a signal from the NCR-Fwd based on the beam notified by the beam index in the time resource notified by the time resource information, The time resource information notifies resources of multiple time slots to which the beam index can be applied.

12. A base station, comprising: at least one transceiver; at least one memory; as well as at least one processor operatively coupled to the at least one transceiver and the at least one memory, The at least one processor performs operations, the operations comprising: Sending a beam index applied to an access link between the NCR-Fwd and a user equipment UE and time resource information related to the beam index to the NCR-MT of the NCR including the network control relay NCR-mobile terminal MT and the NCR-forwarding Fwd; and receiving a signal from the NCR-Fwd based on the beam notified by the beam index in the time resource notified by the time resource information, The time resource information notifies resources of multiple time slots to which the beam index can be applied.

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