WO2020091569A1

WO2020091569A1 - Method for communicating with base station by means of terminal in unlicensed band, and device using same

Info

Publication number: WO2020091569A1
Application number: PCT/KR2019/014858
Authority: WO
Inventors: 명세창; 김선욱; 안준기
Original assignee: 엘지전자 주식회사
Priority date: 2018-11-02
Filing date: 2019-11-04
Publication date: 2020-05-07

Abstract

Provided are a method for communicating with a base station by means of a terminal in an unlicensed band, and a device using the method. The method receives, from the base station, configured grant allocation information indicating a resource available for uplink transmission of a configured grant manner, wherein the resource includes two or more subbands in a frequency domain, a subband being a unit for the terminal to perform a channel access procedure, performs the channel access procedure in each of the two or more subbands, and transmits an uplink signal only in a specific subband capable of uplink transmission, of the two or more subbands, within a channel occupancy time (COT) secured as a result of performing the channel access procedure, wherein information indicating the specific subband is transmitted to the base station.

Description

Method for a terminal to communicate with a base station in an unlicensed band and an apparatus using the method

The present disclosure relates to wireless communication, and more particularly, to a method for a terminal to communicate with a base station in an unlicensed band and an apparatus using the method.

Wireless communication systems have been widely deployed to provide various types of communication services such as voice and data. In general, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of the multiple access system include a Code Division Multiple Access (CDMA) system, a Frequency Division Multiple Access (FDMA) system, a Time Division Multiple Access (TDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, and a Single Carrier Frequency (SC-FDMA). Division Multiple Access) system.

Meanwhile, as more communication devices require a larger communication capacity, a need for an improved mobile broadband communication has emerged compared to a conventional radio access technology (RAT). In addition, Massive Machine Type Communications (MTC), which provides various services anytime, anywhere by connecting multiple devices and objects, is also one of the major issues to be considered in next-generation communication. In addition, communication system design considering services / terminals that are sensitive to reliability and latency is being discussed. The introduction of next-generation wireless access technology in consideration of such extended mobile broadband communication, massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC) is discussed, and in the present disclosure, for convenience, the corresponding technology (technology) Is called new RAT or NR.

Cellular communication systems such as long term evolution (LTE) / NR systems also have unlicensed bands, such as the 2.4 gigahertz (GHz) band, which is mainly used by existing Wi-Fi systems, or the newly attracted 5 GHz and We are considering using unlicensed bands such as the 60 GHz band for traffic offloading.

Basically, an unlicensed band assumes a method of transmitting and receiving wirelessly through competition between communication nodes, so it is checked that other communication nodes do not transmit signals by performing channel sensing before each communication node transmits a signal. Is asking. For convenience, such an operation is called a listen before talk (LBT) or a channel access procedure (CBT). In particular, an operation for checking whether another communication node transmits a signal is carrier sensing (CS), another communication node. It is defined that the clear channel assessment (CCA) has been confirmed when it is determined that the signal is not transmitted.

Meanwhile, the transmitting end (eg, the terminal) acquires a certain channel occupancy time (COT) through the LBT, and then transmits a signal to the receiving end (eg, the base station) within the COT. When the terminal transmits the signal only in a part of the COT, the remaining time can be shared with the base station, and the base station can transmit a downlink signal to the terminal in the remaining time.

The UE may transmit an uplink signal using a preset grant method, that is, a preset periodic resource without an uplink grant. However, resources allocated for uplink transmission of the set grant scheme and resources acquired through the LBT may be different in the frequency domain. For example, a resource allocated for uplink transmission of a set grant method may be 40 MHz, and a resource acquired through LBT may be 20 MHz.

In this situation, it may be a problem how the base station and the terminal share the COT with each other.

The technical problem to be solved by the present disclosure is to provide a method for a terminal to communicate with a base station in an unlicensed band and an apparatus using the method.

In one aspect, it provides a method for a terminal to communicate with a base station in an unlicensed band. In the method, the configured grant allocation information indicating resources available for uplink transmission of a configured grant method is received from the base station, but the resource performs a channel access procedure by the terminal. A channel occupancy time (COT) secured as a result of performing two or more subbands in a frequency domain, a channel access procedure in each of the two or more subbands, and a result of performing the channel access procedure. Within, it is characterized in that the uplink signal is transmitted only from a specific subband capable of uplink transmission among the two or more subbands, and information indicating the specific subband is transmitted to the base station.

The terminal provided in another aspect includes a transceiver that transmits and receives a wireless signal and a processor that operates in combination with the transceiver, wherein the processor is configured for uplink transmission of a configured grant method from a base station. Receiving set grant allocation information indicating available resources, the resource includes two or more subbands in a frequency domain in which the terminal performs a channel access procedure, and the two or more A specific subband capable of uplink transmission among the two or more subbands within a channel occupancy time (COT) secured as a result of performing the channel access procedure in each of the subbands and performing the channel access procedure Only transmits an uplink signal, but informs the base station of the information informing the specific subband. Characterized in that the transmission.

A processor for a wireless communication device provided in another aspect controls the wireless communication device to receive set grant allocation information indicating resources available for uplink transmission of a configured grant method from a base station, , The resource includes two or more sub-bands in a frequency domain in which the UE performs a channel access procedure, performs a channel access procedure in each of the two or more sub-bands, and the channel. Within a channel occupancy time (COT) secured as a result of performing the access procedure, an uplink signal is transmitted only in a specific subband capable of uplink transmission among the two or more subbands, but notifies the specific subband Is characterized in that the information is transmitted to the base station.

In the unlicensed band, the time remaining after the uplink transmission in the COT acquired by the terminal can be efficiently shared with the base station.

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

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

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

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

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

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

7 shows a slot structure.

8 illustrates CORESET.

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

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

11 illustrates the structure of a self-contained slot.

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

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

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

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

16 is for explaining a random access procedure.

17 is for explaining a power ramping car circle.

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

19 shows an example of a wireless communication system supporting an unlicensed band.

20 is an example of a channel access procedure for transmitting a downlink signal in an unlicensed band.

21 is an example of a channel access procedure for transmitting an uplink signal in an unlicensed band.

22 illustrates the REG structure.

23 illustrates non-interleaved CCE-REG mapping.

24 illustrates interleaved CCE-REG mapping.

25 illustrates a block interleaver.

26 illustrates an uplink transmission operation of the terminal.

27 illustrates repetitive transmission based on the established grant.

28 is an example of COT sharing between uplink and downlink.

29 illustrates a method for a terminal to communicate with a base station in an unlicensed band.

30 is an example of a communication method between a base station and a terminal in an unlicensed band.

31 illustrates a communication method between a terminal and a base station when the actual transmission band of the terminal is not notified to the base station.

32 is another example of a communication method between a terminal and a base station.

33 is another example of a communication method between a terminal and a base station.

34 is another example of a communication method between a terminal and a base station.

35 shows an example of performing a CUL COT sharing operation only in a band in which DL LBT is successful among a plurality of LBT subbands.

36 shows an example of the operation of the terminal and the base station when the base station indicates that CUL transmission is not allowed in the shared COT.

FIG. 37 illustrates performing a CUL COT sharing operation only in a DL LBT successful band among a plurality of LBT subbands.

38 illustrates the operation of the base station and the terminal when the base station indicates that CUL transmission is not allowed in the shared COT.

39 exemplifies downlink transmission of the base station in the shared COT and signaling for transmission BW between the terminal and the base station.

40 illustrates a wireless device that can be applied to the present disclosure.

41 illustrates a signal processing circuit for a transmission signal.

42 illustrates a portable device applied to the present disclosure.

43 illustrates a network initial connection and subsequent communication processes.

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

45 illustrates the DRX cycle.

46 shows another example of a wireless device applied to the present disclosure. The wireless device may be implemented in various forms according to use-example / service.

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

48 illustrates a vehicle or autonomous vehicle applied to the present disclosure.

49 illustrates a vehicle applied to the present disclosure.

50 illustrates an XR device applied to the present disclosure.

51 illustrates a robot applied to the present disclosure.

52 illustrates an AI device applied to the present disclosure.

In the following specification, “/” and “,” should be construed to indicate “and / or”. For example, “A / B” may mean “A and / or B”. “A, B” may mean “A and / or B”. “A / B / C” may mean “at least one of A, B, and / or C”. “A, B, C” may mean “at least one of A, B, and / or C”.

In the following specification, “or” should be interpreted to indicate “and / or”. For example, “A or B” may include “only A”, “only B”, and / or “both A and B”. In other words, in the following specification, “or” may be interpreted to indicate “additionally or alternatively”.

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

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

The base stations 20 may be connected to each other through an X2 interface. The base station 20 is connected to an EPC (Evolved Packet Core, 30) through an S1 interface, and more specifically, a mobility management entity (MME) through an S1-MME and a serving gateway (S-GW) through an S1-U.

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

The layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems, L1 (first layer), It can be divided into L2 (second layer) and L3 (third layer). Among them, the physical layer belonging to the first layer provides an information transfer service using a physical channel. The radio resource control (RRC) layer located in the third layer serves to control radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

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

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

Data moves between different physical layers, that is, between the physical layers of the transmitter and the receiver through a physical channel. The physical channel can be modulated by an orthogonal frequency division multiplexing (OFDM) method, and utilizes time and frequency as radio resources.

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

The functions of the RLC layer include concatenation, segmentation and reassembly of RLC SDUs. In order to guarantee various quality of service (QoS) required by a radio bearer (RB), the RLC layer includes a transparent mode (TM), an unacknowledged mode (UM), and an acknowledgment mode (Acknowledged Mode). , AM). AM RLC provides error correction through automatic repeat request (ARQ).

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

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

Setting RB means a process of defining characteristics of a radio protocol layer and a channel to provide a specific service, and setting each specific parameter and operation method. The RB can be further divided into two types: SRB (Signaling RB) and DRB (Data RB). SRB is used as a channel for transmitting RRC messages in the control plane, and DRB is used as a channel for transmitting user data in the user plane.

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

A downlink transport channel for transmitting data from a network to a terminal includes a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). On the other hand, an uplink transport channel for transmitting data from a terminal to a network includes a random access channel (RACH) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.

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

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

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

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

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

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

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

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

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

Referring to Figure 5, gNB is an inter-cell radio resource management (Inter Cell RRM), radio bearer management (RB control), connection mobility control (Connection Mobility Control), radio admission control (Radio Admission Control), measurement settings and provision Functions such as (Measurement configuration & Provision) and dynamic resource allocation may be provided. AMF can provide functions such as NAS security and idle state mobility processing. UPF may provide functions such as mobility anchoring and PDU processing. The Session Management Function (SMF) can provide functions such as terminal IP address allocation and PDU session control.

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

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

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

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

Table 1 below illustrates the subcarrier spacing configuration μ.

[Table 1]

Table 2 shows the number of slots in a ^frame (N ^{frame, μ} _slot ), the number of slots in a ^subframe (N ^{subframe, μ} _slot ), and the number of symbols in a ^slot (N ^slot _symb ) according to subcarrier spacing configuration μ. And the like.

[Table 2]

Table 2-1 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe (SF) according to the SCS when an extended CP is used.

[Table 2-1]

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

7 shows a slot structure.

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

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

A physical downlink control channel (PDCCH) may be composed of one or more control channel elements (CCEs) as shown in Table 3 below.

[Table 3]

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

Meanwhile, in NR, a new unit called a control resource set (CORESET) can be introduced. The terminal may receive the PDCCH in CORESET.

8 illustrates CORESET.

Referring to FIG. 8, CORESET is composed of N ^CORESET _RB resource blocks in the frequency domain and N ^CORESET _symb ∈ {1, 2, 3} symbols in the time domain. N ^CORESET _RB and N ^CORESET _symb may be provided by a base station through a higher layer signal. As illustrated in FIG. 8, a plurality of CCEs (or REGs) may be included in CORESET.

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

The terminal may receive a plurality of CORESETs.

Referring to FIG. 9, the control area 300 in a conventional wireless communication system (eg, LTE / LTE-A) is configured over the entire system band used by a base station. All terminals, except for some terminals (for example, eMTC / NB-IoT terminals) supporting only a narrow band, receive radio signals in the entire system band of the base station in order to properly receive / decode control information transmitted by the base station. I should be able to.

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

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

Meanwhile, in the NR, high reliability may be required depending on an application field, and in this situation, DCI (downlink control information) transmitted through a downlink control channel (eg, a physical downlink control channel: PDCCH) The target block error rate (BLER) for) may be significantly lower than in the prior art. As an example of a method for satisfying such a requirement that requires high reliability, the amount of content included in DCI may be reduced, and / or the amount of resources used for DCI transmission may be increased. . At this time, the resource 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 spatial domain.

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

<Self-contained subframe structure>

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

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

In FIG. 10, the hatched area indicates a downlink control area, and the black part indicates an uplink control area. The region without an indication may be used for downlink data (DL data) transmission, or may be used for uplink data (UL data) transmission. The characteristic of this structure is that downlink (DL) transmission and uplink (UL) transmission are sequentially performed in one subframe, DL data is transmitted in a subframe, and UL ACK / NACK (Acknowledgement / Not-acknowledgement) is also available. As a result, when a data transmission error occurs, it takes less time to retransmit the data, thereby minimizing latency of the final data transmission.

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

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

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

1.DL only configuration

2. UL only configuration

3. Mixed UL-DL configuration

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

-DL control area + GP + UL area

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

The PDCCH may be transmitted in the DL control region, and the PDSCH may be transmitted in the DL data region. PUCCH may be transmitted in the UL control region, and PUSCH may be transmitted in the UL data region. In PDCCH, downlink control information (DCI), for example, DL data scheduling information, UL data scheduling information, and the like may be transmitted. In the PUCCH, uplink control information (UCI), for example, ACK / NACK (Positive Acknowledgement / Negative Acknowledgement) information for DL data, CSI (Channel State Information) information, SR (Scheduling Request) may be transmitted. The GP provides a time gap in the process of the base station and the terminal switching from the transmission mode to the reception mode or the process from the reception mode to the transmission mode. In a subframe, some symbols at a time point of switching from DL to UL may be set as GP.

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

In this case, having a Transceiver Unit (TXRU) to control transmission power and phase for each antenna element enables independent beamforming for each frequency resource. However, in order to install the TXRU on all 100 antenna elements, there is a problem in that it is ineffective in terms of price. Therefore, a method of mapping a plurality of antenna elements to one TXRU and adjusting a beam direction with an analog phase shifter is considered. The analog beamforming method has a disadvantage in that it can make only one beam direction in all bands and thus cannot perform frequency selective beamforming.

It is possible to consider hybrid beamforming (BB) having B TXRUs, which are fewer than Q antenna elements, as an intermediate form of digital beamforming (analog BF) and digital beamforming (analog BF). In this case, although there are differences depending on the connection scheme of the B TXRUs and Q antenna elements, the direction of beams that can be simultaneously transmitted is limited to B or less.

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

In FIG. 12, the number of digital beams is L, and the number of analog beams is N. Furthermore, in the NR system, the base station is designed to change the analog beamforming on a symbol-by-symbol basis, and considers a direction for supporting more efficient beamforming to terminals located in a specific region. Further, when defining a specific N TXRU and M RF antennas as one antenna panel in FIG. 11, the NR system considers a method of introducing a plurality of antenna panels to which hybrid beamforming independent of each other is applicable. Is becoming.

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

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

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

For PBCH, polar coding may be used. The UE may assume a band-specific subcarrier interval for the SS / PBCH block unless the network sets the UE to assume a different subcarrier interval.

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

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

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

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

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

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

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

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

According to the upper layer parameter 'SSB-transmitted-SIB1', an index of SS / PBCH blocks in which the UE cannot receive other signals or channels in REs overlapping REs corresponding to SS / PBCH blocks is set. Can be. In addition, by the upper layer parameter 'SSB-transmitted', the SS / PBCH blocks have an index of SS / PBCH blocks per serving cell in which the UE cannot receive other signals or channels in REs overlapping the REs corresponding to the SS / PBCH blocks Can be set. The setting by 'SSB-transmitted' may take priority over the setting by 'SSB-transmitted-SIB1'. The periodicity of the half frame for reception of SS / PBCH blocks per serving cell may be set by the upper layer parameter 'SSB-periodicityServingCell'. If the UE does not receive the periodicity of the half frame for reception of SS / PBCH blocks, the UE should assume the periodicity of the half frame. The UE may assume that periodicity is the same for all SS / PBCH blocks in the serving cell.

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

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

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

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

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

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

Hereinafter, acquisition of system information will be described.

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

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

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

-SIBs other than SIB1 are carried as a SystemInformation (SI) message transmitted on the DL-SCH. Each SI message is transmitted within a periodic time domain window (called an SI-window);

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

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

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

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

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

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

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

Hereinafter, random access will be described.

The random access procedure of the terminal can be summarized as in Table 4 below.

[Table 4]

16 is for explaining a random access procedure.

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

Random access preamble sequences having two different lengths are supported. Long sequences of length 839 apply to subcarrier spacing of 1.25 kHz and 5 kHz, and short sequences of length 139 apply to subcarrier spacing of 15, 30, 60, and 120 kHz. Long sequences support an unrestricted set and limited sets of type A and type B, while short sequences support only an unrestricted set.

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

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

17 is for explaining a power ramping car circle.

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

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

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

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

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

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

In an NR system, up to 400 megahertz (MHz) per component carrier (CC) can be supported. If a terminal operating in such a wideband CC always operates with RF on the entire CC, the battery consumption of the terminal may increase. Or, considering various use cases (eg, eMBB, URLLC, mMTC, etc.) operating in one broadband CC, different numerology for each frequency band in the CC (eg, subcarrier spacing (sub -carrier spacing (SCS)) may be supported. Or, capacities for the maximum bandwidth may be different for each terminal. In consideration of this, the base station may instruct the terminal to operate only in a partial bandwidth, not the entire bandwidth of the broadband CC, and is intended to define the corresponding partial bandwidth as a bandwidth part (BWP) for convenience. The BWP may be composed of consecutive resource blocks (RBs) on a frequency axis, and one neurology (eg, subcarrier spacing, cyclic prefix (CP) length, slot / mini-slot) Duration, etc.).

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

Hereinafter, a channel access procedure according to LAA (Licensed-Assusted Access) will be described. Here, the licensed assisted access (LAA) may refer to a method of performing data transmission and reception in an unlicensed band in combination with an unlicensed band (eg, a WiFi band). In addition, the cell accessed by the terminal in the unlicensed band may be referred to as a USCell (or LAA secondary cell), and a cell connected in the licensed band may be a primary cell.

First, downlink channel access procedures will be described.

The eNB operating as the LAA secondary cell (s) must perform the following channel access procedure to access the channel (s) on which the LAA secondary cell (s) transmission (s) are performed.

Hereinafter, a channel access procedure for transmission (s) including PDSCH / PDCCH / EPDCCH (PDSCH / PDCCH / EPDCCH) will be described.

If the channel in the idle / idle state is sensed first during the slot period of the delay duration T _d , and if the counter N is 0 in step 4, the eNB transmits the LAA secondary cell (s) ( The transmission may be performed including PDSCH / PDCCH / EPDCCH on a carrier on which field) is performed. The counter N is adjusted by sensing the channel for additional slot period (s) according to the following steps.

1) Set N = N _init . Here, N _init is an arbitrary number uniformly distributed between 0 and CW _p . Then go to step 4.

2) If N> 0 and the eNB selects to decrease the counter, N = N-1 is set.

3) The channel for the additional slot duration is sensed, and if the additional slot duration is idle, the process goes to step 4. Otherwise, go to step 5.

4) If N = 0, stop, otherwise go to step 2.

5) The channel is sensed until a busy slot is detected within an additional delay period T _d or all slots of the additional delay period T _d are detected as idle.

6) If the channel is sensed as idle for all slot periods of the additional delay period T _d , go to step 4. Otherwise, go to step 5.

If the eNB has not transmitted a transmission including PDSCH / PDCCH / EPDCCH on the carrier on which the LAA secondary cell (s) transmission (s) is performed after step 4 of the above procedure, the eNB is ready to transmit PDSCH / PDCCH / EPDCCH If the channel is idle for at least the slot period T _sl , and it is detected that the channel is idle for all slot periods of the delay period T _d immediately before this transmission, the eNB includes PDSCH / PDCCH / EPDCCH on the carrier. The transmission can be transmitted. When the eNB senses the channel for the first time since it is ready to transmit, it fails to sense that the channel is idle within the slot period T _sl or during any slot periods of the delay period T _d immediately before this scheduled transmission. When it is detected that the channel is not idle, the eNB proceeds to step 1 after sensing that the channel is idle during the slot periods of the delay period T _d .

The delay period T _d is composed of the duration T _f = 16us immediately after the continuous slot period m _p . Here, each slot period is T _sl = 9us, and T _f includes an idle slot duration T _sl at a starting point of T _f .

The slot period T _sl is considered idle if the eNB senses the channel during the slot period and the power sensed by the eNB for at least 4us within the slot period is less than the energy detection threshold X _Thresh . Otherwise, the slot period T _sl is considered complicated.

CW _p (CW _{min, p} ≤ CW _p ≤ CW _{max, p} ) is a contention window. CW _p application is described in the contention window application procedure.

CW _{min, p} and CW _{max, p} are selected prior to step 1 of the above-described procedure.

As shown in Table 5 _, m _p , CW _{min, p} , and CW _{max, p} are based on a channel access priority class related to eNB transmission.

X _Thresh adjustment is described in the energy detection threshold adaptation procedure.

If N> 0 in the above procedure, when the eNB transmits discovery signal transmission (s) that does not include PDSCH / PDCCH / EPDCCH, the eNB should not decrease N during slot period (s) overlapping discovery signal transmission.

The eNB should not continuously transmit on the carrier on which the LAA secondary cell (s) transmission (s) is performed for a period exceeding T _{mcot, p} given in Table 5.

For p = 3 and p = 4, T _{mcot, p} = if the absence of any other technology sharing the carrier can be guaranteed in the long term (eg, by the level of regulation). 10 ms, otherwise, T _{mcot, p} = 8 ms.

Table 5 is a table of channel access priority classes.

[Table 5]

Hereinafter, a channel access procedure for transmissions including discovery signal transmission (s) without discovery of PDSCH will be described.

The eNB immediately detects that the channel is idle for at least the sensing interval T _drs = 25us, and if the duration of the transmission is less than 1 ms, the LAA secondary cell (s) that transmits the discovery signal and does not include the PDSCH. It is possible to transmit on the carrier on which the transmission (s) is performed. T _drs consists of T _f = 16us immediately following one slot period T _sl = 9us, and T _f includes an idle slot period T _sl at the starting point of T _f . The channel is considered to be idle for a T _drs when sensing that the idle during slot duration if T _drs.

Hereinafter, a contention window adjustment procedure will be described.

If the eNB transmits the transmissions including the PDSCH associated with the channel access priority class p on the carrier, the eNB maintains the contention window value CW _p and before step 1 of the above-described procedure for transmissions using the following steps Adjust CW _p to.

1) Set CW _p = CW _{min, p} for all priority classes p∈ {1, 2, 3, 4}.

2) If at least Z = 80% of HARQ-ACK values corresponding to PDSCH transmission (s) in the reference subframe k is determined to be NACK, all priority classes p∈ {1, 2, 3, 4 } For _p , then increase to the next allowed high value and remain in step 2. Otherwise, go to step 1.

The reference subframe k is the start subframe of the most recent transmission on the carrier made by the eNB where at least some HARQ-ACK feedback is expected to be available.

The eNB should adjust the value of CW _p for all priority classes p∈ {1, 2, 3, 4} only once based on the given reference subframe k.

If CW _p = CW _{max, p,} then the next highest allowed value for CW _p application is CW _{max, p} .

When determining Z,

-If eNB transmission (s) for which HARQ-ACK feedback is available starts in the second slot of subframe k, HARQ-ACK values corresponding to PDSCH transmission (s) in subframe k + 1 are also PDSCH in subframe k It may be used in addition to HARQ-ACK values corresponding to the transmission (s).

-If HARQ-ACK values correspond to PDSCH transmission (s) on the LAA secondary cell allocated by (E) PDCCH transmitted on the same LAA secondary cell,

-If HARQ-ACK feedback is not detected for PDSCH transmission by the eNB, or if the eNB detects that it is in a 'DTX', 'NACK / DTX', or 'any' state, NACK is calculated.

-If HARQ-ACK values correspond to PDSCH transmission (s) on the LAA secondary cell allocated by (E) PDCCH transmitted on another serving cell,

-If HARQ-ACK feedback for PDSCH transmission is detected by the eNB, the 'NACK / DTX', or 'any' state is calculated as NACK, and the 'DTX' state is ignored.

-If HARQ-ACK feedback for PDSCH transmission is not detected by the eNB,

--- If PUCCH format 1b using channel selection is expected to be used by the UE, the 'NACK / DTX' state corresponding to 'no transmission' is calculated as NACK, and 'no transmission' ) 'Is ignored. Otherwise, HARQ-ACK for PDSCH transmission is ignored.

-If PDSCH transmission has two codewords, the HARQ-ACK value of each codeword is considered separately.

-Bundled HARQ-ACK over M subframes is considered as M HARQ-ACK responses.

If the eNB transmits a transmission that includes a PDCCH / EPDCCH having DCI format 0A / 0B / 4A / 4B and does not include a PDSCH associated with a channel access priority class p on a channel starting from time t ₀ , the eNB is a competition window Keep the value CW _p and adjust CW _p before step 1 of the above-described procedure for transmissions using the following steps.

1) Set CW _p = CW _{min, p} for all priority classes p∈ {1, 2, 3, 4}.

2) Less than 10% of transmission blocks successfully received by uplink (UL) transmission blocks scheduled by the eNB using a type 2 channel access procedure within a time interval from t ₀ to t ₀ + T _CO If so, increase CW _p to the next higher allowed value for all priority classes p∈ {1, 2, 3, 4} and remain in step 2. Otherwise, go to step 1.

Here, T _CO is calculated as described in the channel access procedure for uplink transmission (s) described later.

If CW _p = for the production of N _init CW _{max, p} is subsequently used K times, CW _p is the CW _p = CW _max, the priority class p using _p is successively K times for the production of N _init Is reset to CW _{min, p} only. K is {1, 2,… for each priority class p∈ {1, 2, 3, 4} by the eNB. , 8}.

Hereinafter, an energy detection threshold adaptation procedure will be described.

The eNB accessing the carrier on which the LAA secondary cell (s) transmission (s) is performed should set the energy detection threshold (X _Thresh ) to be equal to or less than the maximum energy detection threshold X _{Thresh_max} .

X _{Thresh_max} is determined as described below.

-If the absence of other technologies sharing carriers is warranted in the long term (eg by regulatory level),

-X _{Thresh_max} = min {T _max + 10dB, X _r }.

--- Xr is the maximum energy detection threshold in dB if the regulatory requirements are defined, otherwise X _r = T _max +10 dB.

- Otherwise,

-X _{Thresh_max} = max {-72 + 10 * log10 (BWMHz / 20Mhz) dBm, min {T _max , T _max -T _A + (P _H + 10 * log10 (BWMHz / 20MHz) -P _TX )}} .

- here,

-T _A = 10 dB for transmission (s) including PDSCH.

-T _A = 5 dB for transmissions that do not include PDSCH and include discovery signal transmission (s).

-P _H = 23dBm.

-PTX is the maximum eNB output power set in dBm for the carrier.

--- The eNB uses the maximum transmission power set for a single carrier regardless of whether single carrier or multi-carrier transmission is used.

-T _max (dBm) = 10 * log10 (3.16228 * 10 ^-8 (mW / MHz) * BWMHz (MHz)).

-BWMHz is the single carrier bandwidth in MHz.

Hereinafter, a channel access procedure for transmission (s) on multiple carriers on a plurality of carriers will be described.

The eNB may access a plurality of carriers on which LAA secondary cell (s) transmission (s) are performed according to one of Type A or Type B procedures described below.

Hereinafter, Type A multi-carrier access procedures will be described.

The eNB should perform channel access on each carrier c _i ∈C according to the channel access procedure for the transmission (s) including PDSCH / PDCCH / EPDCCH described above. Here, C is a set of carriers the eNB intends to transmit, i = 0, 1, 쪋, q-1, and q is the number of carriers the eNB intends to transmit.

The counter N described in the channel access procedure for the transmission (s) including the PDSCH / PDCCH / EPDCCH described above is determined for each carrier c _i (c_i), and is indicated by N _{c_i} . N _{c_i} is maintained in the following type A1 or type A2.

Hereinafter, Type A1 will be described.

The counter N described in the channel access procedure for the transmission (s) including the PDSCH / PDCCH / EPDCCH described above is independently determined for each carrier c _i and is indicated by N _{c_i} .

If the absence of other technologies sharing the carrier is not guaranteed in the long term (eg, by regulatory class), when the eNB stops transmitting on any one carrier c _j ∈C, each carrier c _i ≠ c with respect to _j, eNB may resume the N _{c_i} reduced if sensed after the re-initialization or after a wait for a period of N _{c_i} idle slot (idle slot) to 4T _sl.

Hereinafter, Type A2 will be described.

The counter N described in the channel access procedure for the transmission (s) including the PDSCH / PDCCH / EPDCCH described above is determined for the carrier c _j ∈C and is indicated by N _{c_j} . Here, c _j is a carrier having the largest CW _p value. For each carrier _i c, a N = N _{c_j} _{c_i.} When the eNB stops transmitting on any one carrier for which N _{c_i} has been determined, the eNB must reinitialize N _{c_i} for all carriers.

Hereinafter, a Type B multi-carrier access procedure will be described.

The carrier c _j ∈C is selected as follows by the eNB.

-eNB uniformly randomly selects c _j from C before each transmission on a plurality of carriers c _i ∈C, or

-eNB does not select c _j more than once every 1 second.

Here, C is a set of carriers that the eNB intends to transmit, and i is 0, 1,… , q-1, q is the number of carriers that the eNB intends to transmit.

To transmit on the carrier c _j ,

-eNB should perform channel access on carrier c _j according to the channel access procedure for the transmission (s) including PDSCH / PDCCH / EPDCCH described above, which has the following modification to type B1 or type B2. .

To transmit on the carriers c _i ∈C, c _i ≠ c _j ,

- carrier c _i is idle for each carrier c for _i, eNB have to sense the carrier c _i for at least sensing interval T _mc = 25us just prior to transmission on a carrier c _j and, eNB, at least a sensing interval T _mc It can be transmitted on the carrier c _i immediately after sensing. The carrier c _i is considered to be idle for T _mc if the channel is sensed as idle during all time periods during which idle sensing is performed on carrier c _j within a given interval T _mc .

The eNB should not continuously transmit on the carriers c _i ∈C and c _i ≠ c _j for a period exceeding T _{mcot, p} given in Table 5. Here, the value of T _{mcot, p} is determined using a channel access parameter used for carrier c _j .

Hereinafter, Type B1 will be described.

A single CW _p value is maintained for the set C of carriers.

When determining CW _p for the channel access on the carrier c _j , step 2 of the procedure described in the contention window adjustment procedure is modified as follows.

-If at least Z = 80% of HARQ-ACK values corresponding to PDSCH transmission (s) in the reference subframe k of all carriers c _i ∈C is determined to be NACK, each priority class p∈ {1, For 2, 3, 4}, increase CW _p to the next highest allowed value, otherwise go to step 1.

Hereinafter, Type B2 will be described.

The CW _p value is maintained independently for each carrier c _i ∈C using the aforementioned competition window application procedure.

When determining N _init for carrier c _j , the CW _p value of carrier c _j1 ∈C is used, where c _j1 is the carrier with the largest CW _p value among all carriers in set C.

Hereinafter, uplink channel access procedures will be described.

The UE and the eNB scheduling the uplink transmission (s) for the UE must perform the following procedures to access the channel (s) on which the LAA secondary cell (s) transmission (s) are performed for the UE.

Hereinafter, a channel access procedure for uplink transmission (s) will be described.

The terminal may access the carrier on which the LAA secondary cell (s) uplink transmission (s) is performed according to one of the type 1 or type 2 uplink channel access procedures. The type 1 channel access procedure and the type 2 channel access procedure will be described later.

If an uplink grant scheduling PUSCH transmission indicates a type 1 channel access procedure, the UE uses a type 1 channel access procedure to transmit transmissions including PUSCH transmission unless otherwise described below. Should be.

If an uplink grant scheduling PUSCH transmission indicates a type 2 channel access procedure, the UE uses a type 2 channel access procedure to transmit transmissions including PUSCH transmission unless otherwise described below. Should be.

The terminal should use a type 1 channel access procedure when transmitting SRS transmissions that do not include PUSCH transmission. The uplink channel access priority class p = 1 is used for SRS transmissions not including PUSCH.

Table 6 shows channel access priority classes for uplink.

[Table 6]

If the 'UL configuration for LAA' field configures 'UL offset' l and 'UL duration' d for subframe n,

If the end of the terminal transmission occurs within or before subframe n + l + d-1, regardless of the channel access type signaled in the uplink grant for those subframes, the terminal subframe n + l Channel connection type 2 can be used for transmissions within + i, i = 0, 1,… , d-1.

If the UE uses the PDCCH DCI format 0B / 4B, a set of subframes n ₀ , n ₁ ,… , n _{w-1 in} case of scheduling transmissions including the PUSCH, and when the channel for transmission in subframe n _k is not accessed, the UE subframe n _{k +} according to the channel access type indicated in DCI. You should try to send within ₁ , where k∈ {0, 1,… , w-2}, and w is the number of scheduled subframes indicated in DCI.

If the UE uses one or more PDCCH DCI formats 0A / 0B / 4A / 4B, a set of subframes n ₀ , n ₁ ,… , n _w-1 is scheduled to transmit transmissions without gaps including a PUSCH, and the subframe n _k after the terminal accesses a carrier according to one of type 1 or type 2 uplink channel access procedures. In case of performing transmission in the terminal, the terminal can continue transmission in subframes after n _k , where _k , {0, 1,… , w-1}.

If the start of UE transmission in subframe n + 1 is immediately after the end of UE transmission in subframe n, the UE does not expect to receive different channel access types for transmissions in those subframes.

If the UE uses one or more PDCCH DCI formats 0A / 0B / 4A / 4B, subframes n ₀ , n ₁ ,… , n _w-1 is scheduled to transmit without gaps, k1∈ {0, 1,… , w-2} If transmission is stopped during or before subframe n _k1 , and the channel is sensed by the terminal to be continuously idle after the terminal stops transmission, the terminal is a subsequent subframe n _k2 , k2∈ {1,… , w-1} using a type 2 channel access procedure. If the channel sensed by the terminal does not continuously idle after the terminal stops transmitting, the terminal subframe n _k2 , k2∈ {1,… , w-1} can be transmitted using a type 1 channel access procedure having an uplink channel access priority level indicated in DCI corresponding to subframe n _k2 .

If the UE receives the UL grant, DCI indicates the PUSCH transmission starting in subframe n using the Type 1 channel access procedure, and if the UE performs the ongoing (ongoing) Type 1 channel access procedure before subframe n If you have,

-If the uplink channel access priority class value p ₁ used in the continuous type 1 channel access procedure is equal to or greater than the uplink channel access priority class value p ₂ indicated by the DCI, the UE performs the persistent type PUSCH transmission may be transmitted in response to the UL grant by accessing a carrier using a 1-channel access procedure.

-If the uplink channel access priority class value p ₁ used in the continuous type 1 channel access procedure is smaller than the uplink channel access priority class value p ₂ indicated by the DCI, the UE performs the continuous channel access procedure. Should exit.

If the UE is scheduled to transmit on set C of carriers in subframe n, and UL grants scheduling PUSCH transmissions on set C of carriers indicate a type 1 channel access procedure, and if the same ' PUSCH starting position ' If it is indicated for all carriers in the set C of carriers, and if the carrier frequencies of the set C of carriers are a subset of one of a set of predefined carrier frequencies,

-In the following cases, the terminal may transmit on the carrier c _i ∈C using a type 2 channel access procedure.

-If the type 2 channel access procedure is performed on the carrier c _i immediately before the terminal transmission on the carriers c _j ∈C, i ≠ j, and

-If the terminal is connected to the carrier c _j using a type 1 channel access procedure,

--- Here, the carrier c _j is uniformly randomly selected by the UE from the set C of carriers before performing a type 1 channel access procedure on any carrier in the set C of carriers.

When an eNB transmits on a carrier according to a channel access procedure for transmission (s) including PDSCH / PDCCH / EPDCCH, the eNB DCI of UL grant scheduling transmission (s) including PUSCH on a carrier in subframe n Type 2 channel access procedure can be indicated within. Or, when the eNB transmits on the carrier according to the channel access procedure for the transmission (s) including PDSCH / PDCCH / EPDCCH, the eNB is a type 2 channel for the transmission (s) including PUSCH on the carrier in subframe n. The 'UL configuration for LAA' field may indicate that the access procedure can be performed. Alternatively, if the sub-frame n is started at t ₀ to t ₀ + occurs within a time interval ending at T _CO, eNB is T _{short_ul} = subframe n in a carrier that follows the transmission by the eNB on a carrier having a duration of 25us Transmissions including PUSCH can be scheduled on the network. Where T _CO = T _{mcot, p} + T _g ,

-t ₀ is the time at which the eNB starts transmission (time instant),

-T _{mcot, p} value is determined by the base station as described in the downlink channel access procedure,

-T _g is any time period exceeding 25us, occurring between the downlink transmission of the base station and the uplink transmission scheduled by the base station, and between any two uplink transmissions scheduled by the base station starting at t ₀ Is the total time interval of the gaps.

If continuous scheduling is possible, the eNB should schedule uplink transmissions between t ₀ and t ₀ + T _CO in consecutive subframes.

For uplink transmission on a carrier following transmission by the eNB on a carrier having a duration of T _{short_ul} = 25us, the UE may use a type 2 channel access procedure for the uplink transmission.

If the eNB instructs the type 2 channel access procedure for the UE in DCI, the eNB indicates the channel access priority level used to obtain access to the channel in DCI.

Hereinafter, a Type 1 UL channel access procedure will be described.

After the terminal senses that the channel is idle for the first time during the slot period of the delay duration T _d , and after the counter N is 0 in step 4, the terminal may transmit the transmission using a type 1 channel access procedure. The counter N is adjusted by sensing the channel for additional slot period (s) according to the following steps.

2) If N> 0 and the eNB selects to decrease the counter, N = N-1 is set.

4) If N = 0, stop, otherwise go to step 2.

If the UE has not transmitted the transmission including the PUSCH on the carrier on which the LAA secondary cell (s) transmission (s) is performed after step 4 of the above-described procedure, the UE is prepared if the UE transmits the transmission including the PUSCH When the channel is sensed to be idle at least in the slot period T _sl , and if the channel is sensed to be idle for all slot periods of the delay period T _d immediately before transmission including the PUSCH, a transmission including the PUSCH is transmitted on the carrier. Can transmit. When the channel is first sensed after the UE is ready to transmit, the channel is not sensed as idle within the slot period T _sl , or if any of the delay period T _d immediately before the intended transmission including PUSCH If the channel is not sensed as idle during the slot periods, the terminal proceeds to step 1 after sensing that the channel is idle during the slot periods of the delay period T _d .

The slot period T _sl is considered idle if the terminal senses the channel during the slot period and the power sensed by the terminal for at least 4us within the slot period is less than the energy detection threshold X _Thresh . Otherwise, the slot period T _sl is considered complicated.

CW _p (CW _{min, p} ≤ CW _p ≤ CW _{max, p} ) is a contention window. CW _p application will be described in the competition window application procedure described later.

CW _{min, p} and CW _{max, p} are selected before step 1 described above.

m _p , CW _{min, p} and CW _{max, p} are based on the channel access priority class signaled to the terminal as shown in Table 4.

The application of X _Thresh is described in the energy detection threshold adaptation procedure described below.

Hereinafter, a Type 2 UL channel access procedure will be described.

If the uplink UE uses a type 2 channel access procedure for transmission including the PUSCH, the UE may transmit a transmission including the PUSCH immediately after sensing that the channel is idle for a sensing interval of at least T _{short_ul} = 25us. . T _{short_ul} is _composed of a period T _f = 16us immediately following a one shot duration T _sl = 9us, and T _f includes an idle slot period T _sl at the starting point of T _f . If it detects if a child during the period of the slot T _{short_ul,} the channel is considered to be one for the children T _{short_ul.}

Hereinafter, a contention window adjustment procedure will be described.

If the terminal transmits the transmission using the type 1 channel access procedure related to the channel access priority class p on the carrier, the terminal maintains the contention window value CW _p , and the above-described type 1 uplink channel using procedures described below. CW _p for such transmissions must be applied prior to step 1 of the access procedure.

-If the NDI value for at least one HARQ procedure related to HARQ_ID_ref is toggled,

-Set CW _p = CW _{min, p} for all priority classes p∈ {1, 2, 3, 4}.

-Otherwise, for all priority classes p∈ {1, 2, 3, 4}, increase CW _p to the next highest allowed value.

HARQ_ID_ref is the HARQ process ID of the UL-SCH in the reference subframe n _ref . The reference subframe n _ref is determined as follows.

-If the UE receives the uplink grant within the subframe n _g , the subframe n _w is the most recent sub before the subframe n _g -3 in which the UE transmits the UL-SCH using the type 1 channel access procedure It is a frame.

-If the UE starts at subframe n ₀ without gaps, n ₀ , n ₁ ,… , If the transmission including the UL-SCH in n _w is transmitted, the reference subframe nref is a subframe n ₀ ,

_-Otherwise , the reference subframe n _ref is subframe n _w .

If the UE uses a type 1 channel access procedure, a set of subframes n ₀ , n ₁ ,… , scheduled to transmit transmissions containing a PUSCH without gaps within n _w-1 , and if it is unable to transmit any transmission containing a PUSCH within the set of subframes, the UE has all priority classes p∈ { For 1, 2, 3, 4}, the CW _p value can be maintained without changing.

If the reference subframe for the last scheduled transmission is also n _ref , the UE uses all Type 1 channel access procedures to make all priority classes p∈ {1, the same as for the last scheduled transmission including the PUSCH. CWp values for 2, 3, and 4} can be maintained.

If for the production of N _init CW _p = CW _{max, p} is used, a continuous K times, CW _p is N for the generation of the _init CW _p = CW _{max, p} is rated priority of the use continuously the K rank p Is reset to CW _{min, p} only. K is {1, 2,… for each priority class p∈ {1, 2, 3, 4}. , 8} is selected by the terminal from the set of values.

The terminal accessing the carrier on which the LAA secondary cell (s) transmission (s) is performed should set the energy detection threshold (X _Thresh ) to be less than or equal to the maximum energy detection threshold X _{Thresh_max} .

X _{Thresh_max} is determined as follows.

-If the terminal is set by the upper layer parameter ' maxEnergyDetectionThreshold-r14 ',

-X _{Thresh_max} is set equal to the value signaled by the upper layer parameter.

- Otherwise,

-The terminal should determine X ' _{Thresh_max} according to the default maximum energy detection threshold calculation procedure described later.

-If the terminal is set by the upper layer parameter ' energyDetectionThresholdOffset-r14 ',

--- X _{Thresh_max} is set by applying X ' _{Thresh_max} according to the offset value signaled by the upper layer parameter.

-- Otherwise,

--- The terminal should set X _{Thresh_max} = X ' _{Thresh_max} .

Hereinafter, a default maximum energy detection threshold computation procedure will be described.

If the upper layer parameter ' absenceOfAnyOtherTechnology-r14 ' indicates TRUE:

-X ' _{Thresh_max} = min {T _max + 10dB, X _r }, where:

-X _r is the maximum energy detection threshold, defined by regulatory requirements in dBm, when regulatory requirements are defined. Otherwise, X _r = T _max +10 dB.

Otherwise,

-X ' _{Thresh_max} = max {-72 + 10 * log10 (BWMHz / 20MHz) dBm, min {T _max , T _max -T _A + (P _H + 10 * log10 (BWMHz / 20MHz) -P _TX )}}

here,

-T _A = 10dB

-P _H = 23dBm

-P _TX is set to the value of P _{CMAX_H, c} .

-T _max (dBm) = 10 * log10 (3.16228 * 10 ^-8 (mW / MHz) * BWMHz (MHz))

-BWMHz is the single carrier bandwidth in MHz.

Hereinafter, a wireless communication system supporting an unlicensed band will be described in detail.

As more communication devices require a larger communication capacity, efficient use of limited frequency bands in the next wireless communication system is becoming an increasingly important demand. Cellular communication systems such as LTE / NR systems also traffic offloading unlicensed bands, such as the 2.4GHz band, used primarily by existing WiFi systems, or unlicensed bands, such as the emerging 5 GHz and 60 GHz bands. We are considering how to use it.

Referring to FIG. 19, a cell operating in a licensed band (hereinafter, also referred to as L-band) may be defined as an L-cell, and a carrier of the L-cell may be referred to as (DL / UL) LCC. In addition, a cell operating in an unlicensed band (hereinafter, also referred to as a U-band) may be defined as a U-cell, and a carrier of the U-cell may be referred to as (DL / UL) UCC. The carrier / carrier-frequency of the cell may mean the operating frequency (eg, center frequency) of the cell. A cell / carrier (eg, component carrier (CC)) may be collectively referred to as a cell.

19 (a), when the terminal and the base station transmit and receive signals through carrier-coupled LCC and UCC, LCC may be set to PCC (primary CC) and UCC to SCC (secondary CC). Or, as shown in Figure 19 (b), the terminal and the base station can transmit and receive signals through a single UCC or a plurality of carrier-coupled UCC. That is, the terminal and the base station may transmit and receive signals through only the UCC (s) without LCC. In the unlicensed band of the NR system, both NSA mode and SA mode can be supported.

Hereinafter, the signal transmission / reception operation in the unlicensed band described in the present disclosure may be performed based on all the above-described deployment scenarios (unless otherwise stated).

Meanwhile, in an unlicensed band, a method of wireless transmission and reception through contention between communication nodes may be assumed. Therefore, it is required that each communication node performs channel sensing before transmitting the signal to confirm that the other communication node does not transmit the signal. For convenience, such an operation is called a listen before talk (LBT) or a channel access procedure (CAP).

In particular, the operation of checking whether another communication node is transmitting a signal may be called CS (carrier sensing), and a case where it is determined that the other communication node is not transmitting a signal may be called clear channel assessment (CCA).

The base station (eNB) or the terminal of the LTE / NR system also needs to perform LBT for signal transmission in the unlicensed band (U-band). In addition, when the base station or the terminal of the LTE / NR system transmits a signal, other communication nodes such as WiFi should also perform LBT so as not to cause interference. For example, in the WiFi standard (801.11ac), the CCA threshold is defined as -62 dBm for a non-WiFi signal and -82 dBm for a WiFi signal. This means that a station (terminal) or an access point (AP), for example, does not transmit a signal to prevent interference when a signal other than WiFi is received at a power of -62 dBm or more.

In order to transmit uplink data of the UE in the unlicensed band, first, the base station must succeed in LBT for UL grant transmission on the unlicensed band, and the UE must also succeed in LBT for UL data transmission. That is, UL data transmission may be attempted only when both LBTs of the base station and the terminal are successful.

20 is a flowchart of a first downlink CAP operation for transmitting a downlink signal through an unlicensed band of a base station.

Referring to FIG. 20, the base station may initiate a channel access process (CAP) for downlink signal transmission through an unlicensed band (eg, signal transmission including PDSCH / PDCCH) (S1210). The base station may arbitrarily select the backoff counter N within the contention window CW according to step 1. At this time, the N value is set to the initial value N _init (S1220). N _init is selected as a random value between 0 and CW _p . Subsequently, if the backoff counter value N is 0 according to step 4 (S1230; Y), the base station ends the CAP process (S1232). Subsequently, the base station may perform Tx burst transmission including PDSCH / PDCCH (S1234). On the other hand, if the backoff counter value is not 0 (S1230; N), the base station decreases the backoff counter value by 1 according to step 2 (S1240). Subsequently, the base station checks whether the channel of the U-cell (s) (cell in the unlicensed band) is idle (S1250), and if the channel is idle (S1250; Y), checks whether the backoff counter value is 0 ( S1230). Conversely, if the channel is not idle in step S1250, that is, if the channel is busy (S1250; N), the base station according to step 5, a delay time longer than the slot time (eg, 9usec) (defer duration T _d ; 25usec or more) During the process, it is checked whether the corresponding channel is idle (S1260). If the channel is idle in the delay period (S1270; Y), the base station can resume the CAP process again. Here, the delay period may be composed of 16 usec intervals and immediately following mp consecutive slot times (eg, 9 usec). On the other hand, if the channel is busy during the delay period (S1270; N), the base station performs the step S1260 again to check whether the channel of the U-cell (s) is idle during the new delay period. MP, minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW sizes applied to the CAP according to the channel access priority class can be referred to Table 5 above. have.

The contention window size applied to the first downlink CAP may be determined based on various methods. For example, the contention window size may be adjusted based on a probability that HARQ-ACK values corresponding to PDSCH transmission (s) in a certain time period (eg, a reference TU) are determined as NACK. When the base station performs downlink signal transmission including the PDSCH associated with the channel access priority class p on the carrier, HARQ-ACK values corresponding to the PDSCH transmission (s) in the reference time interval / opportunity k (or reference slot k) When the probability determined by NACK is at least Z = 80%, the base station increases the set CW values for each priority class to the next higher priority. Or, the base station maintains the CW values set for each priority class as initial values. The reference time period / opportunity (or reference slot) may be defined as a start time period / opportunity (or start slot) in which at least a portion of HARQ-ACK feedback is available on which the most recent signal transmission is performed.

Meanwhile, the base station may perform a downlink signal transmission through an unlicensed band (eg, a signal transmission including discovery signal transmission and no PDSCH) based on a second downlink CAP method described later. .

When the length of the signal transmission section of the base station is 1 ms or less, the base station transmits a downlink signal (eg, discovery signal transmission) through an unlicensed band immediately after the corresponding channel is sensed as idle for at least a sensing period T _drs = 25 us. And PDSCH). Here, T _drs is composed of a section T _f (= 16us) immediately following one slot section T _sl = 9us.

The third downlink CAP method is as follows.

The base station can perform the following CAP for downlink signal transmission through multiple carriers in an unlicensed band.

1) Type A: The base station performs CAP on multiple carriers based on counter N (counter N considered in CAP) defined for each carrier, and performs downlink signal transmission based on this.

-Type A1: Counter N for each carrier is determined independently of each other, and downlink signal transmission through each carrier is performed based on the counter N for each carrier.

-Type A2: Counter N for each carrier is determined as an N value for the carrier having the largest contention window size, and downlink signal transmission through the carrier is performed based on the counter N for each carrier.

2) Type B: The base station performs a CAP based on the counter N only for a specific carrier among a plurality of carriers, and performs downlink signal transmission by determining whether or not to channel idle for the remaining carriers prior to signal transmission on the specific carrier .

-Type B1: A single contention window size is defined for a plurality of carriers, and the base station utilizes a single contention window size when performing CAP based on Counter N for a specific carrier.

-Type B2: The contention window size is defined for each carrier, and when determining the Ninit value for a specific carrier, the largest contention window size among the contention window sizes is used.

The UE performs contention-based CAP for transmission of an uplink signal in an unlicensed band. The terminal performs a type 1 or type 2 CAP for uplink signal transmission in an unlicensed band. In general, the terminal may perform a CAP (eg, type 1 or type 2) set by the base station for uplink signal transmission.

21 is a flowchart of a type 1 CAP operation of a terminal for uplink signal transmission.

The terminal may initiate a channel access process (CAP) for signal transmission through the unlicensed band (S1510). The terminal may arbitrarily select the backoff counter N in the contention window CW according to step 1. At this time, the N value is set to the initial value N _init (S1520). N _init is selected as any value between 0 and CW _p . Subsequently, if the backoff counter value N is 0 according to step 4 (S1530; Y), the terminal ends the CAP process (S1532). Subsequently, the UE may perform Tx burst transmission (S1534). On the other hand, if the backoff counter value is not 0 (S1530; N), the terminal decreases the backoff counter value by 1 according to step 2 (S1540). Subsequently, the UE checks whether the channel of the U-cell (s) (cell in the unlicensed band) is idle (S1550), and if the channel is idle (S1550; Y), checks whether the backoff counter value is 0 ( S1530). Conversely, if the channel is not idle in step S1550, that is, if the channel is busy (S1550; N), the terminal according to step 5, the delay time longer than the slot time (eg, 9usec) (defer duration T _d ; 25usec or more) While, it is checked whether the corresponding channel is in an idle state (S1560). If the channel is idle in the delay period (S1570; Y), the terminal can resume the CAP process again. Here, the delay period may be composed of 16 usec intervals and immediately following mp consecutive slot times (eg, 9 usec). On the other hand, if the channel is busy during the delay period (S1570; N), the terminal performs step S1560 again to check whether the channel is idle during the new delay period.

Refer to Table 6 above for mp, minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW sizes applied to the CAP according to the channel access priority class. Can be.

The contention window size applied to the type 1 uplink CAP may be determined based on various methods. For example, the contention window size may be adjusted based on whether to toggle the New Data Indicator (NDI) value for at least one HARQ processor associated with HARQ_ID_ref, which is the HARQ process ID of the UL-SCH in a certain time interval (eg, reference TU). have. When the UE performs signal transmission using a type 1 channel access procedure related to the channel access priority class p on the carrier, the UE receives all priority classes p ∈ when NDI values for at least one HARQ process associated with HARQ_ID_ref are toggled. For {1, 2, 3, 4}, set CW _p = CW _{min, p} , and if not, the next higher permission for CW _p for all priority classes p ∈ {1, 2, 3, 4} Increase to the next higher allowed value.

The reference time period / opportunity n _ref (or reference slot n _ref ) may be determined as follows.

Terminal window size / opportunity (or slots) in the UL grant received n _g and the time interval / opportunity (or _{_{slot) n 0, n 1, ...}} , n w time intervals in / opportunity (or slot) n ₀ Starting from and performing transmission including a gap-free UL-SCH (where time interval / opportunity (or slot) n _w is a time interval / opportunity when the UE transmits the UL-SCH based on the type 1 CAP (or Slot) is the most recent time period / opportunity (or slot) before n _g -3), the reference time period / opportunity (or slot) n _ref is the time period / opportunity (or slot) n ₀ .

(2) Type 2 uplink CAP method

When a UE uses a type 2 CAP for transmission of an uplink signal (eg, a signal including PUSCH) through an unlicensed band, the UE immediately senses that the channel is idle for at least a sensing period T _{short_ul} = 25 us (immediately after) An uplink signal (eg, a signal including PUSCH) may be transmitted through an unlicensed band. T _{short_ul} is _composed of one slot section T _sl = 9us immediately following (immediately followed) section T _f = 16us. T _f includes an idle slot section T _sl at the starting point of the T _f .

In addition, a delay of at least 4 msec is required between an UL grant and UL data scheduled from the UL grant in the LTE system. Therefore, when another transmission node coexisting in the unlicensed band accesses during the corresponding time, the scheduled UL data transmission may be delayed. For this reason, a method of increasing the efficiency of UL data transmission in an unlicensed band is being discussed.

In LTE licensed assisted access (LAA), the base station may inform the UE of an AUL (autonomous uplink) allowed / possible subframe or slot through a bitmap composed of X bits (for example, X = 40 bits). Through this, the base station can inform the UE of autonomous UL transmission capable of transmitting UL data without UL grant.

When the UE is instructed to activate automatic transmission (auto Tx activation), it is possible to transmit uplink data without a UL grant in a subframe or slot indicated in the corresponding bitmap. Just as the base station sends PDCCH, which is scheduling information necessary for decoding, when the PDSCH is transmitted to the UE, the UE can transmit AUL UCI, which is information necessary for the base station to decode the PUSCH, when transmitting the PUSCH in the AUL.

The AUL-UCI includes HARQ ID, NDI (new data indicator), redundancy version (RV), AUL SF (subframe) start position, AUL SF last position, and information required for receiving AUL PUSCH and UE initiated COT (UE-initiated COT). It may include information for sharing the base station and the like.

In particular, sharing the terminal-initiated COT with the base station specifically transfers some of the channels caught by the terminal to the base station through a random-backoff-based category 4 LBT (or type 1 channel access procedure), The base station transmits PDCCH (and / or PDSCH) when the channel idles through one use LBT of 25 usec (using a timing gap provided by the terminal emptying the last symbol). It means that you can.

On the other hand, in order to support UL transmission with relatively high reliability and low latency even in NR, the base station i) a higher layer signal (eg, RRC signaling) or ii) a higher layer signal and an L1 (physical layer) signal ( For example, the configured grant type 1 (configured grant type 1, hereinafter abbreviated to type 1) and type 2 (configured grant type 2, below) that set time and frequency and code domain resources to the terminal by a combination of DCI) Type 2).

Even without receiving the UL grant from the base station, the UE can perform UL transmission using a resource configured as type 1 or type 2. Type 1 is the period of the grant set without the L1 signal and offset relative to the system frame number (SFN) = 0, time / frequency resource allocation, number of repetitions, DMRS parameters, modulation coding scheme (MCS) / transport block size (TBS) , All of the power control parameters and the like can be set only with an upper layer signal such as RRC. Type 2 sets the period and power control parameters of the grant set through an upper layer signal such as RRC, and information on the remaining resources (for example, offset of initial transmission timing and time / frequency resource allocation, DMRS parameter, MCS / TBS) Etc.) is a method indicated through the activation DCI which is an L1 signal.

The biggest difference between the set grant scheme of AUL and NR of LTE LAA is the presence or absence of the HARQ-ACK feedback transmission method for the PUSCH transmitted by the UE without the UL grant and the UCI transmitted together during PUSCH transmission.

In terms of the HARQ-ACK feedback transmission method, in the LTE LAA, explicit HARQ-ACK feedback information is transmitted through AUL-DFI (downlink feedback information), but in the NR set grant scheme, symbol index, period, and number of HARQ processes The HARQ process is (implicitly) determined using the equation of

In terms of UCI transmitted together in PUSCH transmission, information such as HARQ ID, NDI, and RV is transmitted as AUL-UCI in LTE LAA whenever AUL PUSCH is transmitted. In the established grant scheme of NR, the UE recognizes / identifies the UE using time / frequency resources and DMRS resources used for PUSCH transmission, whereas in LTE LAA, it is explicitly specified in AUL-UCI transmitted along with PUSCH along with DMRS resources. The terminal is recognized / identified using the included terminal ID.

1. Downlink channel structure

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

(1) Physical downlink shared channel (PDSCH)

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

(2) Physical downlink control channel (PDCCH)

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

22 illustrates one REG structure.

In FIG. 22, D denotes a resource element (RE) to which DCI is mapped, and R denotes RE to which DMRS is mapped. The DMRS may be mapped to the 1st, 5th, and 9th REs in the frequency domain direction within one symbol.

The PDCCH is transmitted through a control resource set (CORESET). CORESET is defined as a set of REGs with a given numerology (eg, SCS, CP length, etc.). Multiple OCRESETs for one UE may overlap in the time / frequency domain. CORESET may be set through system information (eg, MIB) or UE-specific higher layer (eg, Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of symbols (up to 3) constituting the CORESET may be set by higher layer signaling.

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

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

-allContiguousRBs: Same as the number of consecutive RBs in the frequency domain inside CORESET.

REGs in CORESET are numbered based on a time-first mapping manner. That is, REGs are sequentially numbered from 0 starting from the first OFDM symbol in the lowest-numbered resource block inside CORESET.

The CCE to REG mapping type is set to one of a non-interleaved CCE-REG mapping type or an interleaved CCE-REG mapping type.

FIG. 23 illustrates a non-interleaved CCE-REG mapping type, and FIG. 24 illustrates an interleaved CCE-REG mapping type.

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

-Interleaved CCE-REG mapping type (or Distributed mapping type): 2, 3 or 6 REGs for a given CCE constitute one REG bundle, and the REG bundle is interleaved within CORESET. The REG bundle in CORESET composed of 1 OFDM symbol or 2 OFDM symbols consists of 2 or 6 REGs, and the REG bundle in CORESET composed of 3 OFDM symbols consists of 3 or 6 REGs. The size of the REG bundle can be set for each CORESET.

25 illustrates a block interleaver.

Referring to FIG. 25, the number of rows (A) of the (block) interleaver for the interleaving operation is set to one of 2, 3, and 6. When the number of interleaving units for a given CORESET is P, the number of columns of the block interleaver is equal to P / A. The write operation for the block interleaver is performed in the row-first direction as shown in FIG. 25, and the read operation is performed in the column-first direction. The cyclic shift (CS) of an interleaving unit may be applied based on an ID that can be set independently of an ID that can be set for DMRS.

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

-controlResourceSetId: represents a set of control resources related to the search space set

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

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

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

Table 7 illustrates features for each type of search space.

[Table 7]

Table 8 illustrates DCI formats transmitted on the PDCCH.

[Table 8]

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

1. Uplink channel structure

The terminal transmits the related signal to the base station through the uplink channel described later, and the base station receives the related signal from the terminal through the uplink channel described later.

(1) Physical uplink shared channel (PUSCH)

PUSCH carries uplink data (eg, UL-shared channel transport block, UL-SCH TB) and / or uplink control information (UCI), and CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform Or, it may be transmitted based on a DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, if transform precoding is not possible (eg, transform precoding is disabled), the UE transmits a PUSCH based on the CP-OFDM waveform, and if transform precoding is possible (eg, transform precoding is enabled), the UE is CP-OFDM. PUSCH may be transmitted based on a waveform or a DFT-s-OFDM waveform. PUSCH transmission is dynamically scheduled by UL grant in DCI, or semi-static based on upper layer (eg, RRC) signaling (and / or Layer 1 (L1) signaling (eg, PDCCH)). Can be scheduled (configured grant). PUSCH transmission may be performed on a codebook basis or a non-codebook basis.

(2) Physical uplink control channel (PUCCH)

PUCCH carries uplink control information, HARQ-ACK and / or scheduling request (SR), and may be divided into Short PUCCH and Long PUCCH according to the PUCCH transmission length.

Table 9 illustrates PUCCH formats.

[Table 9]

PUCCH format 0 carries UCI with a size of up to 2 bits and is mapped and transmitted based on a sequence. Specifically, the terminal transmits a specific UCI to the base station by transmitting one sequence among a plurality of sequences through PUCCH in PUCCH format 0. The UE transmits a PUCCH with PUCCH format 0 in PUCCH resource for setting a corresponding SR only when transmitting a positive SR.

PUCCH format 1 carries UCI of up to 2 bits in size, and the modulation symbol is spread in the time domain by an orthogonal cover code (OCC) (which is set differently depending on whether frequency hopping is performed). DMRS is transmitted on a symbol in which a modulation symbol is not transmitted (ie, time division multiplexing (TDM)).

PUCCH format 2 carries UCI having a bit size larger than 2 bits, and modulation symbols are transmitted through DMRS and Frequency Division Multiplexing (FDM). DM-RS is located at symbol indices # 1, # 4, # 7, and # 10 in a given resource block at a density of 1/3. PN (Pseudo Noise) sequence is used for the DM_RS sequence. For 2 symbol PUCCH format 2, frequency hopping may be activated.

PUCCH format 3 does not perform terminal multiplexing in the same physical resource blocks, and carries a UCI having a bit size larger than 2 bits. In other words, PUCCH resources in PUCCH format 3 do not include orthogonal cover codes. The modulation symbol is transmitted by DMRS and Time Division Multiplexing (TDM).

PUCCH format 4 supports multiplexing up to 4 UEs in the same physical resource block, and carries UCI having a bit size larger than 2 bits. In other words, PUCCH resource of PUCCH format 3 includes an orthogonal cover code. The modulation symbol is transmitted by DMRS and Time Division Multiplexing (TDM).

In the downlink, the base station may dynamically allocate resources for downlink transmission to the UE through the PDCCH (s) (including DCI format 1_0 or DCI format 1_1). In addition, the base station may transmit that some of the pre-scheduled resources to a specific terminal are pre-empted for signal transmission to another terminal through PDCCH (s) (including DCI format 2_1). In addition, the base station sets the period of downlink assignment through upper layer signaling based on the semi-static scheduling (SPS) method, and signals the activation / deactivation of downlink assignment set through PDCCH, thereby initial HARQ transmission. The downlink allocation for the may be provided to the terminal. At this time, when retransmission for initial HARQ transmission is required, the base station explicitly schedules retransmission resources through the PDCCH. When a downlink allocation based on DCI and a downlink allocation based on semi-persistent scheduling collide, the UE may prioritize downlink allocation through DCI.

Similar to the downlink, in the uplink, the base station may dynamically allocate resources for uplink transmission to the UE through the PDCCH (s) (including DCI format 0_0 or DCI format 0_1). In addition, the base station may allocate an uplink resource for initial HARQ transmission to a terminal based on a configured grant method (similar to SPS). However, the uplink resource for retransmission is explicitly allocated through PDCCH (s). As described above, an operation in which an uplink resource is preset by a base station without a dynamic grant (eg, uplink grant through scheduling DCI) is referred to as a “configured grant”. The set grant is defined in the following two types.

-Type 1: Uplink grant of a certain period is provided by higher layer signaling (set without separate first layer signaling)

-Type 2: The uplink grant period is set by upper layer signaling, and the uplink grant is provided by signaling activation / deactivation of the grant set through the PDCCH.

26 illustrates an uplink transmission operation of the terminal.

The terminal may transmit a packet to be transmitted based on a dynamic grant (FIG. 26 (a)) or may transmit based on a preset grant (FIG. 26 (b)).

Resources for grants set to a plurality of terminals may be shared. The uplink signal transmission based on the set grant of each terminal may be identified based on time / frequency resources and reference signal parameters (eg, different cyclic shifts, etc.). Accordingly, if the uplink transmission of the terminal fails due to a signal collision, the base station may identify the corresponding terminal and explicitly transmit a retransmission grant for the corresponding transmission block to the corresponding terminal.

By the set grant, repetition of K times including initial transmission is supported for the same transmission block. The HARQ process ID for the uplink signal repeatedly transmitted K times is determined identically based on the resource for initial transmission. The redundancy version for a corresponding transport block that is repeatedly transmitted K times is one of {0,2,3,1}, {0,3,0,3} or {0,0,0,0} pattern Have

27 illustrates repetitive transmission based on the established grant.

Referring to FIG. 27, the UE may perform repetitive transmission until one of the following conditions is satisfied:

-When an uplink grant for the same transport block is successfully received

-When the number of repetitive transmissions for the corresponding transmission block reaches K

-(For option 2), when the end of cycle P has reached

Hereinafter, symbols / abbreviations / terms used in the present disclosure are as follows.

-PDCCH: Physical Downlink Control Channel

-PUSCH: Physical Uplink Shared Channel

-DCI: Downlink Control Information

-UL grant: uplink scheduling grant

-UL: uplink

-DL: downlink

-COT: channel occupancy time. When LBT is successful, it may mean a channel occupancy time during which signal transmission is possible. The COT started / occupied by DL transmission may be referred to as a base station (gNB) -initiated COT. The COT started / occupied by UL transmission may be referred to as a UE-initiated COT.

-LBT: listen before talk

-CUL: configured grant UL access (configured grant UL access)

-CS: carrier sensing

-CCA: clear channel assessment

-CC: component carrier

-STA: station

-AP: access point

-eMBB: enhanced mobile broad band

-URLLC: ultra-reliable low latency

-mMTC: massive machine-type communication

-BW: bandwidth

-BWP: bandwidth part

-AUL: autonomous UL access

-AUL-UCI: autonomous UL access-uplink control information

-CUL-UCI: configured grant UL access-uplink control information (configured grant UL access-uplink control information)

In an NR-U (unlicensed) system, a bandwidth (BW) of a resource allocated by a UE for 'configured grant' transmission may include a plurality of 20 MHz LBT subbands (sub-band). have. In the present disclosure (disclosure), in the above situation, a method for a terminal to share the uplink channel occupancy time (COT) acquired through the category 4 LBT with the base station to be utilized for downlink transmission of the base station Suggest.

As more and more communication devices require a larger communication capacity, efficient utilization of limited frequency bands in the next wireless communication system becomes more and more important. Cellular communication systems such as LTE / NR systems also utilize unlicensed bands such as the 2.4GHz band mainly used by existing WiFi systems or unlicensed bands such as the newly attracted 5GHz and 60GHz bands for traffic offloading. The plan is being reviewed.

Basically, the unlicensed band assumes a method of wireless transmission and reception through contention between communication nodes. Therefore, it is required that each communication node performs channel sensing before transmitting the signal to confirm that the other communication node does not transmit the signal. For convenience, this operation is called a listen before talk (LBT) or a channel access procedure (channel access procedure). In particular, it may be defined that carrier sensing (CS) determines whether another communication node transmits a signal, or clear channel assessment (CCA) when it determines that another communication node does not transmit a signal. .

The base station (eNB or gNB) or the terminal of the LTE / NR system also needs to perform LBT for signal transmission in an unlicensed band (which may be referred to as a U-band for convenience). In addition, when the base station or the terminal of the LTE / NR system transmits a signal, other communication nodes such as WiFi should also perform LBT so as not to cause interference. For example, in the WiFi standard (801.11ac), the CCA threshold is defined as -62dBm for a non-WiFi signal and -82dBm for a WiFi signal. For example, when a signal other than WiFi is received at a power of -62 dBm or more, it may mean that a STA (station) or an access point (AP) does not transmit signals to prevent interference.

In the NR system, up to 400 MHz can be supported per component carrier (CC). If the terminal operating in the wideband CC is always operated with the radio frequency (RF) unit on the entire CC turned on, the terminal battery consumption may increase. Or, considering various use cases (eg, eMBB, URLLC, mMTC, etc.) operating in one broadband CC, different numerology (numerology, eg, subcarrier spacing) for each frequency band in the CC -carrier spacing)). Or, capacities for the maximum bandwidth may be different for each terminal.

In consideration of these points, the base station may instruct the terminal to operate only in a partial bandwidth, not the entire bandwidth of the broadband CC. For convenience, the bandwidth may be defined as a bandwidth part (BWP). The BWP may be composed of continuous resource blocks (RBs) on a frequency axis, and may be configured in one pneumatic (eg, subcarrier interval, CP length, slot / mini-slot duration). Can be countered.

Meanwhile, the base station can set multiple BWPs even within one CC set for the terminal. For example, in the PDCCH monitoring slot, a BWP occupying a relatively small frequency domain is set, and a PDSCH indicated by the PDCCH can be scheduled on a larger BWP. Or, when the terminals are concentrated on a specific BWP, some terminals may be set in another BWP for load balancing.

Alternatively, in consideration of frequency domain inter-cell interference cancellation between neighboring cells, some of the entire spectrum may be excluded and both BWPs may be set in the same slot. That is, the base station may set at least one DL / UL BWP to a terminal associated with a broadband CC, and at least one DL / UL BWP among DL / UL BWP (s) set at a specific time (L1 signaling Or it may be activated (eg, by MAC CE or RRC signaling). In addition, switching to another set DL / UL BWP may be indicated (by L1 signaling or MAC CE or RRC signaling), or when a timer value expires based on a timer, it may be switched to a predetermined DL / UL BWP. At this time, the activated DL / UL BWP may be defined as an activated DL / UL BWP.

However, in a situation such as before the terminal is in the initial access (initial access) process, or the RRC connection is set up (set up), it may not receive the configuration (configuration) for the DL / UL BWP. In this situation, the DL / UL BWP assumed by the terminal may be defined as an initial activation DL / UL BWP.

On the other hand, for uplink data transmission of the terminal in the unlicensed band, first, the base station must succeed in LBT for UL grant transmission on the unlicensed band, and the terminal must also succeed in LBT for UL data transmission. That is, UL data transmission may be attempted only when both LBTs of the base station and the terminal are successful.

In addition, a delay of at least 4 msec is required between a UL grant and UL data scheduled from the UL grant in the LTE system, and UL data transmission may be delayed when another transmission node coexisting in the unlicensed band first accesses during the corresponding time. have. For this reason, a method of increasing the efficiency of UL data transmission in an unlicensed band is needed.

In an LTE system, an autonomous uplink (AUL) subframe or slot capable of performing autonomous UL transmission capable of transmitting UL data without an UL grant is configured with an X bit bitmap (eg, X = 40 bits). Through this, the base station can inform the terminal.

When the UE is instructed to activate the autonomous uplink transmission, the UE may perform uplink data transmission without a UL grant in a subframe or slot indicated in the bitmap. When the PDSCH is transmitted, the base station may transmit PDCCH, which is scheduling information necessary for decoding, to the UE. Likewise, in AUL, when transmitting a PUSCH, a UE may transmit AUL UCI, which is information necessary for a base station to decode the PUSCH.

The AUL-UCI includes HARQ ID, new data indicator (NDI), redundancy version (RV), AUL subframe (SF) starting position, AUL SF final position (ending position), and other information necessary for AUL PUSCH reception, and Information for sharing a UE-initiated COT (UE-initiated COT) with a base station may be included.

In particular, sharing the terminal-initiated COT with the base station specifically transfers some of the channels caught by the terminal to the base station through a random-backoff-based Category 4 LBT (or type 1 channel access procedure). When the channel idles through a one shot LBT of 25 usec (using a timing gap provided by the terminal emptying the last symbol), it means an operation to transmit the PDCCH (and PDSCH). .

Meanwhile, in an NR-U system based on NR in a non-licensed band, similar to AUL in an LTE system, a 'configured grant' that allows a UE to transmit PUSCH with a preset resource without a UL grant is introduced. can do.

In the present disclosure, after the UE performs uplink transmission in the COT acquired through the category 4 LBT, when the BW of the resource allocated for the 'set grant' transmission may include a plurality of 20 MHz unit LBT subbands We propose a method for sharing the remaining COT with a base station and using it for downlink transmission.

An NR-based channel access scheme for an unlicensed band can be classified as follows.

-Category 1 (Cat-1): Immediately after the previous transmission in the COT, immediately after the short switching gap, the next transmission is made, and the switching gap is shorter than 16us and includes a transceiver turnaround time. Can be.

-Category 2 (Cat-2): This is a LBT method without back-off, and transmission is possible as soon as it is confirmed that the channel is idle for a specific time immediately before transmission.

-Category 3 (Cat-3): LBT method of back-off with a fixed contention window size (CWS), where the transmitting entity is 0 to the maximum (maximum) CWS value (fixed) It is possible to transmit the random number N by pulling the random number N and decreasing the counter value whenever the channel is confirmed to be idle, and then the counter value becomes 0.

-Category 4 (Cat-4): A LBT method that backs off with variable CWS. The transmitting entity pulls a random number N from 0 to the maximum CWS value (variation), and the counter value is checked whenever the channel is confirmed to be idle. When the counter value reaches 0 after decreasing, transmission is possible. When feedback from the receiver that the transmission was not properly received is increased, the maximum CWS value is increased to a higher value, and the increased CWS The random number is again extracted from the value and the LBT procedure is performed again.

1) Terminal (Entity A):

The UE may pre-allocate / set a frequency axis resource that can be used for 'set grant' uplink transmission from the base station. However, in the NR, the BW of the resource allocated / set in this way may be larger than the BW of the LBT subband in the unit of 20 MHz. When the UE actually transmits the PUSCH using the 'established grant' resource, the UE can transmit the PUSCH only in the successful LBT subband by performing category 4 LBT for each LBT subband in 20MHz units. Therefore, the BW of the resource allocated for the purpose of 'set grant' and the transmission BW that the actual terminal uses for PUSCH transmission after performing LBT may be different.

In order to smoothly share the COT with the base station, it is necessary to inform the base station of the transmission BW used by the UE for actual transmission. For example, the UE may be allocated a 'set grant' resource for a 40MHz BW including LBT subbands 1 and 2, each having a 20MHz BW. In this case, only LBT subband 1 succeeds in LBT, and can transmit an uplink only through the corresponding 20 MHz and share the remaining COT with the base station. Then, the base station may also desirably perform downlink transmission only at 20 MHz (LBT subband 1) transmitted by the terminal after successful LBT.

Meanwhile, according to the LBT result, the BW used for the actual transmission may change instantaneously. Therefore, when CUL-UCI similar to AUL-UCI is introduced to NR-U, the information on BW to be used for actual transmission to CUL-UCI is predicted and mapped in advance, or mapping immediately after LBT success is implemented in the terminal. It can be difficult considering the complexity of. In consideration of this, when performing COT sharing between the uplink and downlink, methods for signaling the information on the transmission BW used for actual transmission to the base station are proposed as follows.

[Proposal method # 1] Proposal method # 1 displays signaling for the transmission BW as 'unknown' during X slot (or X ms) immediately after 'set grant' uplink transmission as 'unknown' (may be a specific state of a specific field) And, it is a method of signaling information by including information on an actual transmission BW in a CUL-UCI in a CUL PUSCH burst that is transmitted thereafter.

However, the X value may be the capability of the terminal, and may be a previously promised value or a value set / directed or a value fixed to X = 1.

If a specific sub-band is set as a default or a reference sub-band among 20 MHz LBT sub-bands belonging to a BW allocated to a CUL, the UE is at least a default or reference LBT sub. Only when the LBT of the band is successful can CUL PUSCH transmission be attempted. At this time, the base station receiving the transmission BW as 'unknown' in CUL-UCI may utilize only the default or reference subband of the corresponding terminal for COT sharing. It can be assumed that the UE also signals the transmission BW as 'unknown' and, therefore, receives the downlink through COT sharing only in a corresponding default or reference subband.

Conversely, even if the base station receives the transmission BW as 'unknown' in CUL-UCI, if it is assumed that the base station can know the actual transmission BW of the terminal through DM-RS or an uplink initial signal, etc. From the standpoint, even if the transmission BW is signaled as 'unknown' to CUL-UCI, it can be assumed that downlink reception through COT sharing receives all or part of the transmission BW. That is, the terminal may not expect downlink COT sharing through at least subbands larger than its own transmission BW.

Particularly, when the above operations are applied to notify that COT sharing is possible after Y slot (or Y ms) through CUL-UCI, the corresponding slot in which the COT sharing indication bit is activated sets signaling for transmission BW to 'unknown'. It can also be applied.

[Proposal method # 2] Proposal method # 2, signaling for transmission BW during X slot (or X ms) immediately after 'set grant' uplink transmission is the minimum unit of 20MHz or LBT subband (or specific BW signaled) This is a method of signaling by including information on the actual transmission BW of the UE in the CUL-UCI in the CUL PUSCH burst that is transmitted. However, the X value may be the capability of the terminal, and may be a previously promised value or a value set / directed or a value fixed to X = 1.

If a specific sub-band is set as a default or reference sub-band among 20 MHz LBT sub-bands belonging to the BW allocated to the CUL, the UE is at least a default or reference LBT sub-band. Only after successful LBT can CUL PUSCH transmission be attempted. At this time, the base station that receives the transmission BW in CUL-UCI in the minimum unit of 20MHz or LBT subband may use only the default or reference subband of the corresponding terminal for COT sharing. It can be assumed that the UE also signals the transmission BW in a 20 MHz or LBT subband, and receives downlink through COT sharing only in a corresponding default or reference subband.

In particular, when the above operations are applied to notify that COT sharing is possible after Y slot (or Y ms) through CUL-UCI, the corresponding slot in which the COT sharing indication bit is activated signals signaling for the transmission BW in 20 MHz or LBT subband. It can be applied even when the minimum unit (or a specific BW signaled) of.

[Proposal method # 3] Proposal method # 3 is a method of notifying the base station of the transmission BW actually transmitted by the terminal through the DM-RS or UL initial signal, not CUL-UCI.

Different DM-RS sequences or signals may be previously defined according to the BW transmitted by the actual UE. Alternatively, only a portion of LBT successful among signals generated for DM-RS sequences or signals for all allocated BWs may be transmitted. For example, the portion that failed LBT can be transmitted by puncturing. The corresponding signal can be transmitted in the first symbol of CUL PUSCH or in a set / indicated symbol.

When it is assumed that the base station can know the actual transmission BW of the terminal through the DM-RS or UL initial signal, the terminal can assume that the downlink reception through the COT sharing is received as all or part of the transmission BW. That is, the terminal may not expect downlink COT sharing through at least subbands larger than the actual transmission BW.

28 is an example of COT sharing between uplink and downlink.

Referring to FIG. 28, a resource having a 40 MHz BW is allocated / configured for uplink transmission of a 'set grant' to a terminal. It includes two 20MHz LBT subbands. The UE performs category 4 LBT at 40 MHz BW allocated / set for CUL transmission, for example, succeeds in LBT only in the upper 20 MHz subband, and performs CUL PUSCH within COT for a total of 4 slots through the upper 20 MHz BW. The remaining COT 1 slot transmitted during 3 slots may be shared with the base station for downlink transmission of the base station. In this case, the UE can expect the DL transmission of the base station within the 20 MHz BW transmitted by successfully transmitting the actual LBT in the shared COT.

The terminal may inform the CUL-UCI that is multiplexed with CUL PUSCH and transmit the information about the actually transmitted BW to the X slot (or X ms) in 'unknown' or 20 MHz or LBT subband units. Alternatively, the base station that has shared the COT can be used to transmit the downlink transmission by notifying the base station of the actual CUL PUSCH transmitted BW through the DM-RS or UL initial signal.

Referring to FIG. 29, the UE receives configured grant allocation information informing a resource that can be used for uplink transmission of a configured grant method from a base station (S1210). The established grant scheme may be a transmission scheme for transmitting an uplink data channel through periodic resources set through an upper layer signal without an uplink grant. The resource may include two or more sub-bands in the frequency domain, a unit for which the terminal performs a channel access procedure (which may mean LBT). For example, when the sub-band, which is the performance unit of the LBT, is 20 MHz, the set grant-type resource may be 40 MHz.

The terminal performs a channel access procedure in each of the two or more subbands (S1220), and within the channel occupancy time (COT) secured as a result of performing the channel access procedure, the two or more subbands Among them, an uplink signal is transmitted only in a specific subband capable of uplink transmission (S1230).

In this process, the terminal may transmit information indicating the specific sub-band to the base station based on at least one of the above proposed methods # 1 to # 3.

For example, according to the above-described proposed method # 1, the uplink control information included in the first uplink signal transmitted for the first time in the COT is the first uplink for a predetermined time (the X slot or X ms). The information indicating that the actual band in which the link signal is transmitted is unknown, and the uplink control information included in the second uplink signal transmitted next includes information indicating the actual band in which the second uplink signal is transmitted. It can contain. The predetermined time is a specific time immediately after the transmission of the first uplink signal, and may be a predetermined value, a value set by the base station, or a fixed value.

The terminal can receive or expect a downlink signal from the base station only through a predetermined reference subband among the two or more subbands within the predetermined time.

Alternatively, according to the above-described proposed method # 2, the uplink control information included in the first uplink signal transmitted for the first time in the COT indicates a subband that is a minimum unit for performing a channel access procedure for a predetermined time. The uplink control information included in the second uplink signal transmitted next may include information indicating an actual band in which the second uplink signal is transmitted.

The terminal may transmit the uplink signal only if the channel access procedure is successful in a predetermined reference subband among the two or more subbands.

Alternatively, according to the above-described proposed method # 3, a sequence of a demodulation reference signal used for demodulation of the uplink signal may be configured differently according to the specific subband. The base station may identify the specific subband based on the sequence of the demodulation reference signal. That is, the information on the transmission band actually transmitted by the terminal is not explicitly notified through CUL-UCI, but may be implicitly notified to the base station through DM-RS or an uplink initial signal.

The terminal may receive a downlink signal from the base station only through the specific subband in the COT.

Referring to FIG. 30, the UE may perform the first “set grant (CUL)” uplink transmission through N bands (eg, a band including N subbands). At this time, CUL-UCI may also be transmitted, and the CUL-DCI may also include a field indicating a transmission band of the uplink transmission. The terminal may provide information on the time slot of the X slot (or X ms) immediately after the first 'set grant' uplink transmission through the field. Upon receiving this information, the base station can transmit a downlink signal to the terminal using only the reference subband of the terminal in a time period shared within the COT.

The UE can then perform the second 'set grant' uplink transmission through the N band. At this time, CUL-UCI may also be transmitted, and the CUL-DCI may also include a field indicating a transmission band of the uplink transmission. However, in this case, the field may indicate the actual transmission band (N band).

As described above with reference to FIG. 30, the terminal may inform the base station of information indicating that the actual transmission band of the terminal is unknown for a certain time period immediately after the 'set grant' uplink transmission. In this case, the base station may transmit a downlink signal to the terminal using only the reference subband of the terminal in a time period shared within the COT. This has been already described in the proposed method # 1.

The terminal may inform the base station of the actual transmission band of the terminal in the 'set grant' uplink transmission after the 'set grant' uplink transmission first transmitted in the COT. As in FIG. 32, when the base station is informed that the two sub bands are actually transmission bands, at a time shared in the COT, the base station may transmit a downlink signal to the terminal using both of the two sub bands.

As described in the proposed method # 2, the UE may perform the first 'set grant (CUL)' uplink transmission through N bands (eg, a band including N subbands). At this time, CUL-UCI may also be transmitted, and the CUL-DCI may also include a field indicating a transmission band of the uplink transmission. The terminal, through the field, displays information indicating the minimum unit (eg, subband) of LBT performance in the transmission band for a time interval of the X slot (or X ms) immediately after the first 'set grant' uplink transmission. Can provide. Then, the base station can transmit a downlink signal using the LBT minimum unit (subband).

The UE may then perform the second 'set grant' uplink transmission through the N band. At this time, CUL-UCI can also be transmitted together. The CUL-DCI may include a field indicating a transmission band of the uplink transmission. However, in this case, the field may indicate the actual transmission band (N band). Then, the base station can transmit a downlink signal using the actual transmission band (N band).

As described in the proposed method # 3, information on the band actually transmitted by the UE in the COT may be provided to the base station in an implicit manner. For example, information on the actually transmitted band may be transmitted by DM-RS or an uplink initial signal.

The terminal may perform the first 'set grant' uplink transmission in the N band. At this time, the terminal may perform the uplink transmission using the first DM-RS sequence corresponding to the N band. The base station can grasp the band actually transmitted by the terminal through the first DM-RS sequence, and can perform downlink transmission in the corresponding band based on this.

Thereafter, the UE may perform the second 'set grant' uplink transmission in the M band. At this time, the terminal may perform the uplink transmission using the second DM-RS sequence corresponding to the M band. The base station can grasp the band actually transmitted by the terminal through the second DM-RS sequence, and can perform downlink transmission in the corresponding band based on this.

[Proposal method # 4] When the UE transmits the 'set grant' uplink, CUL-UCI including information on the transmission BW may be mapped and transmitted together as follows.

(1) CUL-UCI can always be mapped from the last symbol in the slot (or from symbol K).

(2) Among the information in the CUL-UCI, information about the transmission BW can be mapped from the last symbol (or symbol K) at the end of the slot by applying a separate encoding to other information in the CUL-UCI. .

(3) The starting point of (actual) transmission of the CUL-PUSCH in the slot (or the most recent transmission time among candidates that can start transmission in the slot or the most recent transmission time among candidates that can start transmission in the slot) and When the gap between the first symbols to which the CUL-UCI is mapped is larger than the Y symbol (or Y usec), the CUL-UCI may be mapped from the last symbol in the slot.

However, the Y value may be the capability of the terminal, and may be a previously promised value or a set / directed value. In addition, when the gap in (3) is smaller than Y, information on the transmission BW can be transmitted to the base station by the methods of [suggestion method # 1], [suggestion method # 2], and [suggestion method # 3] of the present disclosure. .

Alternatively, even in the case of (1) and / or (2), the transmission start time of the CUL-PUSCH in the slot (or the most advanced transmission time among candidates that can start transmission in the slot or the most recent candidates that can start transmission in the slot) When the gap between the first symbol to which CUL-UCI is mapped and the first symbol to which CUL-UCI is mapped is greater than or equal to Y symbols (or Y usec), it contains information about the actual transmission BW, and when the CUL-PUSCH starts to transmit (or within the slot) When the gap between the first symbol that is the first symbol to which CUL-UCI is mapped and the first transmission point that is the first to be transmitted among the candidates that can start transmission in the slot or the first symbol to which CUL-UCI is mapped is smaller than the Y symbol (or Y usec) In the [Proposed Method # 1], [Proposed Method # 2], and [Proposed Method # 3] of the present disclosure, information on the transmitted BW may be transmitted to the base station.

However, the K value may be determined or signaled in advance as a specific value. Alternatively, it may be determined as a position relative to the DM-RS symbol position.

It may be difficult considering the complexity of the UE implementation by mapping the CUL-UCI containing the information on the transmission BW immediately after the LBT success. However, as described above, the CUL-UCI mapping method is (1) always mapped from the last symbol in the slot, or (2) CUL-UCI containing information about the transmission BW is always from the last symbol in the slot or (3) CUL-. When the interval between the first symbols to which the CUL-UCI is mapped from the PUSCH transmission start point is greater than Y, a time for information about the transmission BW after the UE succeeds in LBT may be secured.

If the CUL-PUSCH supports a plurality of transmission start times, and the actual transmission start time starts from a specific symbol in the slot, the gap to the first symbol to which the CUL-UCI is mapped is smaller than Y. Information about the transmission BW It may be difficult to directly map the CUL-UCI containing the slot to which the corresponding CUL-PUSCH is transmitted. Therefore, in this case, the information on the transmission BW can be transmitted to the base station in the same manner as the above proposed methods # 1- # 3.

[Proposal method # 9] The size of the BW of the DL / UL BWP set to the UE and the size of the set / directed 'set grant' frequency resource may be a broadband (> 20 MHz) composed of a plurality of LBT subbands. In this case, when the base station informs the terminal that UL transmission is possible by sharing the remaining COT after the DL transmission in the COT acquired through the LBT with the terminal, the terminal of the terminal in a certain band in the COT acquired by the base station Information on whether CUL PUSCH can be transmitted can be indicated or indicated through (DC group common) PDCCH as follows.

The terminal may further receive information indicating that the terminal can perform uplink transmission in a time remaining after the base station performs downlink transmission in the COT. The UE may perform the PUSCH transmission of the CUL scheme only in CUL resources included in a subband indicated by the bitmap among the plurality of subbands in the remaining time.

Hereinafter, the proposed method # 9 will be described in more detail.

(1) Based on the band of the DL (or a band corresponding to the LBT subband (s) indicated that the DL is available) that the base station successfully transmits to the LBT, in which band CUL PUSCH transmission is possible ( Group common). For example, it is possible to inform in which band CUL PUSCH transmission is possible through a bitmap (a bitmap corresponding to each LBT subband) included in the PDCCH. The UE may determine whether the set CUL PUSCH is valid and the LBT type.

Since the existing wireless communication system only supports DL / UL transmission in a single LBT subband (20MHz) unit, the base station can simply inform the group common PDCCH whether or not the UE can transmit AUL within the COT obtained. However, in NR, BWP and CUL resources having a BW greater than 20 MHz can be set, and the terminal and the base station can perform DL / UL transmission when successful by attempting LBT in each of a plurality of LBT subbands constituting the corresponding band. . Therefore, the base station needs to inform in which band in the COT that it has acquired, whether the UL transmission of the terminal is possible, the CUL transmission is possible, and the like.

The base station maps each LBT subband constituting the DL BWP / CC to each 1 bit on the bitmap, and information on which LBT subband succeeds in DL LBT (or which LBT subband DL is available). (For group) PDCCH (common to the group). That is, the (group common) LBT subbands allowed in the bitmap in the PDCCH can be interpreted as being capable of UL transmission and COT sharing of the terminal, and the base station additionally informs the terminal whether CUL transmission is possible or not. It may also indicate whether the UE can transmit the CUL PUSCH through a CUL resource preset in the band.

Alternatively, the base station only informs the UEs of which LBT subbands are successful in which LBT subbands among the LBT subbands constituting the DL BWP / CC, and the UEs receive CUL PUSCHs (resources) preset in the corresponding BWP / CC. For CUL transmission, and / or LBT type for CUL transmission may be determined.

Referring to FIG. 35, an 80 MHz DL BWP composed of 4 LBT subbands in a frequency domain may be set. If the base station succeeds in LBT only in the upper 2 LBT subbands and transmits the DL, and wants to inform the terminal (s) that COT sharing for UL transmission is possible in the remaining COT section, the base station is a bit value of a bitmap composed of 4 bits. Is set to '1100' and the base station's COT information and whether or not CUL transmission in the corresponding COT can be transmitted can be reported through a (group common) PDDCH.

Here, the terminal (s) may have been configured with a single or multiple 'set grant' resources (CUL resources) (eg, CUL resources may be 1 to 4). If the frequency resource of the 'established grant' is in a band in which DL LBT succeeds, and the base station indicates that the CUL COT can be shared in the corresponding band with the (group common) PDCCH, the terminal having data to be transmitted among the terminal (s) is Cat-2 LBT. (Or, if the gap between transmissions is 16 us, it may be transmitted without LBT) After performing the CUL PUSCH can be transmitted.

As in the example of FIG. 35, when the base station instructs the UE that CUL COT sharing is possible after transmitting the 40 MHz PDSCH using the two upper LBT subbands, the four 'set' (or activated) set to the UE Among the Grant 'resources (

CUL resources

1, 2, 3, and 4), CUL resource 1 and CUL resource 2 are located in a band where DL LBT is successful, so if there is data to be transmitted by the terminal, Cat-2 LBT (or the gap between transmissions is 16us) If it is hereinafter, it may be transmitted without LBT.) After performing the LBT, CUL PUSCH transmission is possible.

For example, in CUL resource 1, there is data to be transmitted by the terminal, so CUL PUSCH is transmitted and CUL resource 2 can be transmitted, but there is no data to send, so it may not be transmitted.

In the case of CUL resource 4, since the lowest 20 MHz (311) of the three LBT subbands does not belong to the CUL allowed band, the COT of the base station cannot be shared and transmitted. In this case, the UE may not attempt to transmit CUL PUSCH on CUL resource 4. Alternatively, the UE may attempt to transmit CUL PUSCH using only the CUL allowable band in CUL resource 4.

In the case of CUL resource 3, since the set frequency resource does not belong to the CUL allowable band, but is located in a band that does not overlap with a DL LBT successful band, and is not a DL section, the UE may transmit CUL PUSCH on CUL resource 3. Specifically, if there is data to be transmitted on the CUL resource 3, the UE can transmit a CUL PUSCH upon success by performing general Cat-4 LBT.

In addition to whether or not CUL PUSCH transmission in the shared COT is allowed in this proposal, a minimum (or maximum) LBT priority class value in which transmission is allowed may be indicated. For example, as shown in FIG. 35, while allowing CUL PUSCH transmission in the gNB-initiated COT, LBT priority class #n may be indicated. In this case, if there is data to be transmitted by the terminal and the corresponding data corresponds to LBT priority class #k (<n), CUL PUSCH transmission may not be allowed even in CUL resource 1 and CUL resource 2. At this time, regardless of the indicated LBT priority class on the CUL resource 3 (regardless of whether to allow transmission of the CUL PUSCH in the shared COT), the UE can transmit the CUL PUSCH upon success by performing Cat-4 LBT.

On the other hand, if the base station (group common) PDCCH (i) UL COT sharing is possible and (ii) information on the transmittable band is indicated as a bitmap, but CUL transmission is not allowed, COT sharing is possible. CUL resources overlapped in the and COT regions may not be allowed to be transmitted.

Referring to FIG. 36, after a base station transmits a 40 MHz PDSCH using two LBT subbands at the top, it can indicate to the UE that CUL COT sharing is possible in the two LBT subbands. For example, the base station may indicate the bitmap '1100' through the (common group) PDCCH. Also, the base station may indicate that CUL transmission is impossible. In this case,

CUL resources

1, 2, and 4 set in the subbands that succeed in the shared COT and DL LBT after the DL transmission is finished, because CUL transmission is not allowed in the COT (although the CUL resource is set), CUL PUSCH transmission This is impossible. However, since CUL resource 3 does not overlap with the DL LBT success band of the base station and is not a DL section, CUL transmission is possible in CUL resource 3 after success after performing Cat-4 LBT regardless of the UL COT sharing of the base station.

The above-described [suggestion method # 9] can be applied not only to CUL PUSCH, but also to UL transmissions configured as an upper layer signal such as RRC, for example, UL transmissions such as semi-persistent PUCCH / SRS / PUSCH. (I.e., RRC-configured UL transmissions are allowed if CUL transmission permission is indicated, and RRC-configured UL transmissions are not allowed if CUL transmission is not allowed).

[Proposed method # 11] The remaining COT after DL transmission in the COT acquired by the base station may be shared with the UE. At this time, the base station may indicate / set information on the LBT type and the LBT gap that can be applied to UL transmission to be performed by the terminal in the COT. For example, information on the LBT type and / or the LBT gap is: i) (group common) instructed / set to the terminal through the PDCCH, or ii) instructed / set through a higher layer signal such as an RRC message, or iii) It can be indicated / set by a combination of PDCCH and higher layer signals.

The LBT type that the base station can indicate to the terminal is, for example, Cat-1 LBT or Cat-2 LBT in the 16 us gap and Cat-2 LBT in the 25 us gap.

(1) The base station may indicate one of the possible LBT types as a (group common) PDDCH.

(2) The base station can set which LBT type is used for UL transmission as a higher layer (eg, RRC) signal in advance.

(3) The base station may set the LBT type in advance as an upper layer (eg, RRC) signal in advance, and dynamically indicate one of them (eg, through a PDCCH).

From the UE's point of view, i) the configuration information is received through i) a (physical group downlink) physical downlink control channel (PDCCH), or ii) through a higher layer signal such as an RRC message, or iii) PDCCH And higher layer signals. For example, one channel access procedure type and time gap among a plurality of channel access procedure types and time gaps preset by an upper layer signal may be indicated through the PDCCH.

The UE may further receive COT structure information indicating a downlink region and an uplink region within the COT. Different LBT types may be indicated for a plurality of UL schedulings in the COT based on the information on the COT structure of the base station (DL area and information on the UL area, meaning the above-described COT structure information). . And even if 16us Cat-1 LBT is indicated for the first scheduled UL and 16us Cat-1 LBT is indicated for the second UL transmission, the terminal may have an LBT type different from the LBT type indicated for the first UL (for example, , 16us Cat-2 LBT). That is, when there are a plurality of uplink regions in the COT, the configuration information may inform the type and time gap of a channel access procedure for each uplink region, and may independently inform each of them.

There may be a plurality of LBT types that can indicate to the terminal. For example, Cat-1 LBT and Cat-2 LBT in the 16us gap and Cat-2 LBT in the 25us gap. In the existing LAA, even if the LBT type is indicated as Cat-4 in the UL grant indicated by the base station, the UE can perform Cat-2 LBT instead of Cat-4 LBT if it recognizes that the transmission is UL transmission in the COT of the base station. In the NR-U, since there are three possible LBT types, the base station can instruct the UE to use the (common group) PDCCH or higher layer signal or a combination thereof to perform the LBT type performed by the UE in the COT.

As described in the above (1), three (group common) PDCCHs may be dynamically indicated or, as in (2), it may be set to perform only a specific LBT type in advance with a higher layer signal. Alternatively, as shown in (3), LBT types may be previously set through a higher layer signal and one of them may be dynamically indicated. For example, the 16us Cat-2 LBT and the 25us Cat-2 LBT are set as upper layer signals (group common) and one bit in the PDCCH can be instructed to the terminal which LBT to use.

Different LBT types may be indicated for a plurality of UL schedulings in the COT based on information about the base station's COT structure (DL area and UL area information). Alternatively, although one LBT type is indicated, the terminal may perform LBT by interpreting it as another LBT type. For example, when 16us Cat-1 LBT is instructed for two UL scheduling in the COT of the base station, the LBT just before the second UL may have a possibility that the previous UL transmission may not have been properly performed, so the 16us Cat- Even if 1 LBT is indicated, it can be interpreted as a 16us Cat-2 LBT and transmitted after checking whether the channel is idle once more.

2) Base Station (Entity B):

The base station may pre-allocate / set the resource of the frequency axis that can be used for 'set grant' uplink transmission to the terminal, and the BW of the resource allocated / set may be greater than the BW of the LBT subband in 20MHz units. . When the UE actually transmits using the 'established grant' resource, the UE can transmit PUSCH only in the successful LBT subband by performing category 4 LBT for each LBT subband in 20MHz units. Therefore, the BW of the resource allocated for the 'set grant' use and the transmission BW that the actual terminal uses for transmission after performing LBT may be different. Therefore, in order to transmit a downlink to a BW that does not exceed the BW transmitted by the terminal in the COT shared by the base station, it is necessary to receive information on the transmitted BW sent by the terminal. For example, when the UE is allocated a 'set grant' resource for a 40MHz BW including two

LBT subbands

1 and 2 having a 20MHz BW, only the LBT subband 1 succeeds in LBT and transmits an uplink only through 20MHz. When the remaining COT is shared with the base station, the base station can transmit downlink only to the 20 MHz that the terminal successfully transmits to the LBT. Therefore, when sharing the COT between the uplink and the downlink, the base station can receive information on the actual transmission BW transmitted by the terminal in the following ways.

[Suggestion method # 5] Receive a CUL-UCI indicated as 'unknown' (which may be a specific state of a specific field) signaling for transmission BW during X slot (or X ms) immediately after 'set grant' uplink transmission , CUL-UCI in a CUL PUSCH burst transmitted thereafter may receive information about an actual transmission BW. However, the X value may be the capability of the terminal, and may be a previously promised value or a value set / directed or a value fixed to X = 1.

If a specific sub-band is set as a default or a reference sub-band among 20 MHz LBT sub-bands belonging to a BW allocated to CUL, the UE is at least a default or reference LBT sub-band. Only after successful LBT can CUL PUSCH transmission be attempted. At this time, the base station receiving the transmission BW as 'unknown' in CUL-UCI may utilize only the default or reference subband of the corresponding terminal for COT sharing.

Conversely, even if the base station receives the transmission BW as 'unknown' in the CUL-UCI, if the base station can know the actual transmission BW through the DM-RS or the uplink initial signal or the like (assuming that it exists), in the CUL-UCI Even if the transmission BW is signaled as 'unknown', the downlink transmission through COT sharing can be transmitted only as a whole or a part of the transmission BW. That is, the base station may not transmit downlink through subbands larger than the transmission BW transmitted by the terminal.

[Suggestion method # 6] CUL-UCI indicated as a minimum unit (or a specific BW signaled) of 20 MHz or LBT subband is signaled for transmission BW during X slot (or X ms) immediately after 'set grant' uplink transmission. A CUL-UCI in a CUL PUSCH burst that is received and then transmitted may receive information about an actual transmission BW. However, the X value may be the capability of the terminal, and may be a previously promised value or a value set / directed or a value fixed to X = 1.

If a specific sub-band is set as a default or reference sub-band among 20 MHz LBT sub-bands belonging to BW allocated to CUL, the UE is at least a default or reference LBT sub-band. Only after successful LBT can CUL PUSCH transmission be attempted. At this time, the base station that receives the transmission BW in CUL-UCI in the minimum unit of 20MHz or LBT subband may use only the default or reference subband of the corresponding terminal for COT sharing.

In particular, when the above operations are applied to notify that COT sharing is possible after Y slot (or Y ms), especially through CUL-UCI, the corresponding slot in which the COT sharing indication bit is activated provides signaling for transmission BW in 20 MHz or LBT sub It can also be applied to a minimum unit of a band (or a specific BW signaled).

[Suggestion method # 7] Signaling for the transmission BW actually transmitted from the terminal may be received through DM-RS or UL initial signal, not CUL-UCI.

Different DM-RS sequences or signals may be previously defined according to the BW transmitted by the actual UE. Alternatively, only a portion of the successful LBT among the signals generated for the DM-RS sequence or the signal for all the allocated BWs may be transmitted (ie, the portion that failed the LBT can be transmitted by puncturing). The corresponding signal can be transmitted in the first symbol of CUL PUSCH or in a set / indicated symbol.

When it is assumed that the base station can know the BW actually transmitted by the UE through DM-RS or UL initial signal, downlink transmission through COT sharing from the base station point of view can be performed through all or part of the BW actually transmitted by the UE. Can transmit. That is, the base station may not share downlink COT through subbands larger than the transmission BW actually transmitted by the terminal.

In FIG. 28, in a situation in which a base station allocates / sets a resource having 40 MHz BW including two 20 MHz LBT subbands for 'set grant' uplink transmission to a terminal, the terminal succeeds in LBT only in an upper 20 MHz subband. In addition, CUL PUSCH can be transmitted for 3 slots in COT for 4 slots through 20 MHz BW, and the remaining COT 1 slot can be shared for downlink transmission. In this case, it may be desirable for the base station to transmit downlink only to the BW transmitted by the terminal in the shared COT.

The actual CUL PUSCH is transmitted based on the 'information about the actually transmitted BW' of CUL-UCI included in the CUL PUSCH transmitted from the UE after X slot or (X ms) or through DM-RS or UL initial signal Information about the BW can be known and used for downlink transmission within the shared COT based on this.

[Proposal method # 8] When CUL-UCI including information on transmission BW is mapped in CUL-PUSCH as shown below, it can be used when receiving the information and sharing UL to DL COT.

(1) The CUL-UCI mapped from the last symbol in the slot (or from symbol K) can always be received.

(2) Among the information in the CUL-UCI, the information about the transmitted BW applies a separate encoding to other information in the CUL-UCI, and always receives the mapped CUL-UCI from the last symbol in the slot (or from symbol K). can do.

(3) CUL-PUSCH (real) transmission start time in the slot (or the most advanced transmission time among candidates that can start transmission in a slot or the most recent transmission time among candidates that can start transmission in a slot) and CUL- When the gap between the first symbols to which the UCI is mapped is larger than the Y symbol (or Y usec), the CUL-UCI mapped to the CUL-UCI from the last symbol in the slot may be received.

However, the Y value may be the capability of the terminal, and may be a previously promised value or a set / directed value. In addition, when the gap in (3) is smaller than Y, the information on the transmission BW may be transmitted to the base station by the methods of [suggestion method # 1], [suggestion method # 2], and [suggestion method # 3] of the present disclosure. have.

Alternatively, even in the case of (1) and / or (2), the transmission start time of the CUL-PUSCH in the slot (or the most advanced transmission time among candidates capable of starting transmission in the slot or the candidates capable of starting transmission in the slot) When the gap between the most recent transmission time) and the first symbol to which CUL-UCI is mapped is equal to or greater than Y symbols (or Y usec), it contains information about the actual transmission BW, and the transmission start time of the CUL-PUSCH in the slot (or The gap between the first transmission point among the candidates that can start transmission in the slot or the most recent transmission time among the candidates that can start transmission in the slot and the first symbol to which CUL-UCI is mapped is a Y symbol (or Y usec ) If it is smaller than that, information on the transmission BW may be transmitted to the base station by the methods of [suggestion method # 1], [suggestion method # 2], and [suggestion method # 3] of the present disclosure.

However, the K value may be determined or signaled in advance as a specific value, or may be determined as a position relative to the DM-RS symbol position.

It may be difficult considering the complexity of the UE implementation by mapping the CUL-UCI containing the information on the transmission BW immediately after the LBT success, but the CUL-UCI mapping method is as described above (1) The interval between the first symbol mapped from the last symbol or (2) the CUL-UCI containing the information about the transmission BW is always from the last symbol in the slot or (3) the first symbol to which the CUL-UCI is mapped from the start of the CUL-PUSCH transmission. In a larger case, after the terminal succeeds in LBT, time to transmit information about the transmission BW may be secured. Therefore, the base station can receive the CUL-UCI mapped by the above methods, and utilize it for UL to DL COT sharing by referring to information on the transmission BW.

If the CUL-PUSCH supports a plurality of transmission start times, and the actual transmission start time starts from a specific symbol in the slot, the gap to the first symbol to which the CUL-UCI is mapped is smaller than Y. Information about the transmission BW Since it may be difficult to directly map the CUL-UCI containing the CUL-PUSCH to the slot in which the corresponding CUL-PUSCH is transmitted, in this case, information on the transmission BW may be transmitted to the base station in the same manner as in the above proposed methods # 1- # 3.

[Proposal Method # 10] The size of the BW of the DL / UL BWP set to the UE and the size of the set / directed 'set grant' frequency resource may be a broadband (> 20 MHz) composed of a plurality of LBT subbands. In this case, the base station can inform the UE that UL transmission is possible by sharing the remaining COT after DL transmission in the COT acquired through the LBT. At this time, the PDCCH (group common) containing information on in which band in the COT the base station obtains the CUL PUSCH can be transmitted can be instructed to the UE as follows.

(1) Based on a band (or a band corresponding to the LBT subband (s) instructed that DL is possible) of the DL transmitted by the base station to LBT success (in this case, a single or multiple LBT subbands may be configured) It is possible to inform in which band CUL PUSCH transmission is possible (group common) through a bitmap corresponding to each LBT subband in the PDCCH. In addition, the terminal may determine whether the set CUL PUSCH is valid and the LBT type.

Since the existing wireless communication system only supports DL / UL transmission in a single LBT subband (20MHz) unit, the base station could simply inform the group common PDCCH whether AUL transmission of the UE is possible within the COT obtained by the base station. However, in NR, BWP and CUL having a BW greater than 20 MHz can be set, and the terminal and the base station can perform DL / UL transmission in a successful LBT subband by attempting LBT in a plurality of LBT subbands constituting the corresponding band. . Therefore, the base station needs to inform which band in the COT that it has acquired and whether it is possible to transmit UL or not.

The base station maps each LBT subband constituting the DL BWP / CC to each 1 bit on the bitmap, so that information on which LBT subband succeeds DL LBT (or information on which LBT subband DL is possible) ( Group common) can be notified to terminals through the PDCCH. That is, the LBT subbands allowed in the bitmap in the PDCCH (common to the group) may be interpreted as being capable of sharing the COT with the UL of the UE. The base station may additionally inform the UE whether or not to transmit the CUL, and when the CUL transmission is allowed, the UE may transmit the CUL PUSCH through a CUL resource preset in a corresponding band. Alternatively, the base station only informs the UEs of which LBT subbands are successful in which LBT subbands among the LBT subbands constituting the DL BWP / CC, and the UEs receive CUL PUSCHs (resources) preset in the corresponding BWP / CC. For CUL transmission, and / or LBT type for CUL transmission may be determined.

FIG. 37 exemplifies performing a CUL COT sharing operation only in a DL LBT successful band among a plurality of LBT subbands.

When a DL BWP of 80 MHz composed of 4 LBT subbands is set as shown in FIG. 37, the base station can succeed in LBT only in the upper 2 LBT subbands and perform DL transmission. And, if you want to inform the terminal (s) that it is possible to share the UL COT in the remaining COT section (time) and the band (frequency) that succeeded in LBT, the base station is a bitmap '1100' composed of 4 bits and the COT information of the base station and the corresponding COT Whether or not CUL transmission is possible (group common) can be transmitted through PDDCH.

Here, the terminal (s) may have been configured with a single or multiple 'set grant' resources (eg, CUL resources may be 1 to 4). If the frequency resource of the configured 'set grant' is in a band in which DL LBT succeeds, and the base station indicates that CUL COT sharing is possible in the corresponding band with the (common group) PDCCH, the terminal having data to be transmitted among the terminal (s) is Cat-2 After performing LBT (or, if the gap between transmissions is 16us, it may be transmitted without LBT), CUL PUSCH may be transmitted.

As in the example of FIG. 37, when the base station instructs the UE that CUL COT sharing is possible after transmitting the 40 MHz PDSCH using the two upper LBT subbands, the four (4) configured (or activated) UEs Among the 'Grant' resources, since CUL resource 1 and CUL resource 2 are located in a band where DL LBT is successful, Cat-2 LBT (or, if the gap between transmissions is 16us or less, may be transmitted without LBT) if there is data to be transmitted by the UE. After success, CUL PUSCH transmission is possible.

In the example of FIG. 37, the CUL resource 1 has data to be transmitted by the UE, so the CUL PUSCH can be transmitted and the CUL resource 2 can be transmitted, but the data may not be transmitted because there is no data to send. In the case of CUL resource 4, since the lower 20MHz of the 3 LBT subbands does not belong to the CUL allowed band, the COT of the base station cannot be shared and transmitted. That is, in this case, the UE may not attempt to transmit CUL PUSCH on CUL resource 4. Alternatively, the UE may attempt to transmit CUL PUSCH using only the CUL allowable band in CUL resource 4. In the case of CUL resource 3, since the set frequency resource does not belong to the CUL allowable band, but is located in a band that does not overlap with the DL LBT successful band and is not a DL section, the UE can perform CUL PUSCH transmission on CUL resource 3. Specifically, the terminal can transmit CUL PUSCH upon success by performing general Cat-4 LBT if there is data to be transmitted on the CUL resource 3 phase.

In this proposal, in addition to indicating whether to allow CUL PUSCH transmission in the shared COT, a minimum (or maximum) LBT priority class value for which transmission is allowed may be indicated. For example, while allowing CUL PUSCH transmission in a base station-initiated (gNB initiated) COT as shown in FIG. 37, LBT priority class #n may be indicated. At this time, when there is data to be transmitted by the terminal and the corresponding data corresponds to LBT priority class #k (<n), CUL PUSCH transmission may not be allowed even in CUL resource 1 and CUL resource 2. At this time, regardless of the LBT priority class indicated on the CUL resource 3 phase (also regardless of whether to allow transmission of the CUL PUSCH in the shared COT), the UE can transmit the CUL PUSCH upon success by performing Cat-4 LBT. .

If the base station indicates (i) UL COT sharing is possible through the (group common) PDCCH, and (ii) information about the transmittable band is indicated as a bitmap, however, if CUL transmission is not allowed, the band capable of COT sharing is possible. And CUL resources overlapping the COT region may not be allowed to be transmitted.

As shown in FIG. 38, the base station may indicate information on a band that can be transmitted through a (common group) PDCCH as a bitmap '1100' and indicate that CUL transmission is impossible. In this case,

CUL resources

1, 2, and 4 set in the shared COT (time) and DL LBT successful subbands (frequency) after the DL transmission is finished, CUL transmission is not allowed in the COT even though the CUL resource is set, CUL PUSCH transmission is not possible. However, since CUL resource 3 does not overlap with the DL LBT success band of the base station and is not a DL section, CUL transmission is possible in CUL resource 3 after success after performing Cat-4 LBT regardless of the UL COT sharing of the base station.

[Proposed method # 10] described above can be applied not only to CUL PUSCH, but also to UL transmissions configured as a higher layer signal such as RRC, for example, UL transmissions such as semi-persistent PUCCH / SRS / PUSCH. (I.e., if CUL transmission permission is indicated, RRC-established UL transmissions are allowed, and vice versa).

[Suggestion method # 12] When sharing the remaining COT after DL transmission in the COT acquired by the base station to the UE, information on the LBT type and LBT gap of the UL (s) to be transmitted in the COT is transmitted through the (group common) PDCCH. It can be instructed / set to the terminal, or instructed / set through a higher layer signal, or a combination / instruction of them.

However, the LBT types that can be indicated above are, for example, Cat-1 LBT or Cat-2 LBT in the 16us gap and Cat-2 LBT in the 25us gap.

(4) One of the possible LBT types can be indicated through the (common group) PDDCH.

(5) In advance, it is possible to set which LBT type to transmit UL through a higher layer (eg, RRC) signal.

(6) LBT types may be set in advance through an upper layer (eg, RRC) signal, and one of them may be dynamically indicated.

In addition, different LBT types may be indicated for a plurality of UL schedulings in the COT based on information about the COT structure of the base station (DL area and UL area information). And even if 16us Cat-1 LBT is indicated for the first scheduled UL and 16us Cat-1 LBT is indicated for the second UL transmission, the UE may have an LBT type different from the LBT type indicated for the first UL (for example, , 16us Cat-2 LBT).

There are three types of LBT that can be instructed to the terminal: Cat-1 LBT and Cat-2 LBT in the 16us gap, and Cat-2 LBT in the 25us gap. In the existing LAA, the UE performed Cat-2 LBT instead of Cat-4 LBT if it recognized that the UL transmission is transmitted within the COT of the base station even though the LBT type is indicated as Cat-4 in the UL grant indicated by the base station. In the NR-U, since there are three possible LBT types, the base station can instruct the UE to use the (common group) PDCCH or higher layer signal or a combination thereof to perform the LBT type performed by the UE in the COT.

As shown in (1), three (common to group) PDCCHs can be dynamically indicated, or as shown in (2), it can be set to perform only a specific LBT type in advance with a higher layer signal. Alternatively, as shown in (3), LBT types to be indicated as a higher layer signal may be set in advance and one of them may be dynamically indicated. For example, 16us Cat-2 LBT and 25us Cat-2 LBT are set as upper layer signals (group common) and one terminal in the PDCCH can be instructed to which of the two LBTs to use.

In addition, different LBT types may be indicated for a plurality of UL schedulings in the COT based on information about the COT structure of the base station (DL area and UL area information). Alternatively, although one LBT type is indicated, the terminal may perform LBT by interpreting it as another LBT type. For example, when 16us Cat-1 LBT is instructed for two UL schedulings in the base station's COT, the LBT just before the second UL may have a possibility that the previous UL transmission may not have been properly performed, so the 16us Cat- Even if 1 LBT is indicated, it can be interpreted as a 16us Cat-2 LBT and transmitted after checking whether the channel is idle once more.

3) Receiver and transmitter

Referring to FIG. 39, when a UE transmits a CUL PUSCH only to a BW that has succeeded in LBT among BWs allocated for 'set grant', the UE currently transmits through CUL-UCI, DM-RS or an initial signal (LBT succeeded ) BW information (transmission BW information) may be transmitted to the base station (S330). That is, using the methods from [Suggestion Method # 1] to [Suggestion Method # 6], the CUL-UCI, DM-RS, or UL initial signal multiplexed with CUL-PUSCH is transmitted (currently to LBT Information about the successful BW may be transmitted to the base station.

The base station that has shared the COT may perform downlink transmission based on information on the transmission BW sent by the terminal (S331).

4) Effects of the present disclosure

The terminal or the base station that has shared the COT can start transmission with only the Category 2 LBT, that is, one-shot LBT (DL to UL or UL to DL) without having to perform the random backoff-based Category 4 LBT again. If the gap between the liver is less than 25us). Therefore, when the terminal shares the COT obtained through the category 4 LBT with the base station, the base station can perform channel access quickly and transmit downlink without having to perform the category 4 LBT again.

In NR-U, unlike LTE LAA, a terminal may be allocated a BW of 20 MHz or higher. For example, the transmitter may divide 40 MHz into LBT subbands of 20 MHz and perform LBT for each subband to start transmission only to BWs that have succeeded in LBT. Therefore, when the UE is allocated a BW of 20 MHz or more as a 'set grant' resource and performs Category 4 LBT to perform transmission to the BW that succeeded in LBT and shares the remaining COT to the base station, the base station upgrades the terminal to LBT success It may be desirable to perform downlink transmission only with a BW equal to or smaller than the transmission BW used for link transmission. Therefore, when the UE signals the BW transmitted by the UE to the base station through CUL-UCI or DM-RS or UL initial signals, the base station performs the downlink transmission in the shared COT. Information can be used.

When the remaining time after downlink transmission in the COT acquired by the base station is shared with the terminal, the LBT type and the LBT gap to be performed at the shared time are notified to perform appropriate LBT according to the channel condition or traffic condition. have.

40 illustrates a wireless device that can be applied to the present disclosure.

Referring to FIG. 40, the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR). Here, {the first wireless device 100, the second wireless device 200} is {wireless device 100x, base station 200} and / or {wireless device 100x), wireless device 100x in FIG. }.

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

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

Hereinafter, hardware elements of the

wireless devices

100 and 200 will be described in more detail. Without being limited to this, one or more protocol layers may be implemented by one or

more processors

102 and 202. For example, one or

more processors

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

more processors

102 and 202 may include one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. Can be created. The one or

more processors

102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein. The one or

more processors

102, 202 generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein. , To one or

more transceivers

106, 206. One or

more processors

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

more transceivers

106, 206, and descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed herein Depending on the field, PDU, SDU, message, control information, data or information may be acquired.

One or

more processors

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

more processors

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

more processors

102, 202. Descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein are either firmware or software set to perform or are stored in one or

more processors

102, 202 or stored in one or

more memories

104, 204. It can be driven by the above processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein can be implemented using firmware or software in the form of code, instructions and / or instructions.

The one or

more memories

104, 204 may be coupled to one or

more processors

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

more memories

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

more memories

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

more processors

102, 202. Also, the one or

more memories

104 and 204 may be connected to the one or

more processors

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

The one or

more transceivers

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

more transceivers

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

more transceivers

106, 206 may be connected to one or

more processors

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

more processors

102, 202 may control one or

more transceivers

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

more processors

102, 202 may control one or

more transceivers

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

more transceivers

106, 206 may be coupled to one or

more antennas

108, 208, and one or

more transceivers

106, 206 may be described, functions described herein through one or

more antennas

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

more transceivers

106 and 206 use the received radio signal / channel and the like in the RF band signal to process the received user data, control information, radio signal / channel, and the like using one or

more processors

102 and 202. It can be converted to a baseband signal. The one or

more transceivers

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

more processors

102 and 202 from a baseband signal to an RF band signal. To this end, the one or

more transceivers

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

41 illustrates a signal processing circuit for a transmission signal.

Referring to FIG. 41, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. have. Although not limited to this, the operations / functions of FIG. 41 may be performed in

processors

102, 202 and / or

transceivers

106, 206 of FIG. The hardware elements of FIG. 41 can be implemented in the

processors

102, 202 and / or

transceivers

106, 206 of FIG. 40. For example, blocks 1010 to 1060 may be implemented in

processors

102 and 202 of FIG. 40. In addition, blocks 1010 to 1050 may be implemented in the

processors

102 and 202 of FIG. 40, and block 1060 may be implemented in the

transceivers

106 and 206 of FIG. 40.

The codeword may be converted into a wireless signal through the signal processing circuit 1000 of FIG. 41. Here, the codeword is an encoded bit sequence of an information block. The information block may include a transport block (eg, UL-SCH transport block, DL-SCH transport block). The wireless signal may be transmitted through various physical channels (eg, PUSCH, PDSCH).

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

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

The signal processing process for the received signal in the wireless device may be composed of the inverse of the signal processing processes 1010 to 1060 of FIG. 41. For example, a wireless device (eg, 100 and 200 in FIG. 40) may receive a wireless signal from the outside through an antenna port / transceiver. The received radio signal may be converted into a baseband signal through a signal restorer. To this end, the signal recoverer may include a frequency downlink converter (ADC), an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource de-mapper process, a postcoding process, a demodulation process, and a de-scramble process. The codeword can be restored to the original information block through decoding. Accordingly, the signal processing circuit (not shown) for the received signal may include a signal restorer, a resource de-mapper, a post coder, a demodulator, a de-scrambler and a decoder.

42 illustrates a portable device applied to the present disclosure.

The portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a notebook, etc.). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

Referring to FIG. 42, the mobile device 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input / output unit 140c. ). The antenna unit 108 may be configured as part of the communication unit 110.

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

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

Although not illustrated in FIG. 42, various components such as a camera and a Universal Serial Bus (USB) port may be additionally included in the terminal. For example, the camera can be connected to a processor.

The terminal may perform a network access process to perform the above-described / suggested procedures and / or methods. For example, the terminal may receive and store system information and configuration information necessary to perform the above-described / suggested procedures and / or methods while accessing a network (eg, a base station) and store it in memory. Configuration information necessary for the present disclosure may be received through higher layer (eg, RRC layer; Medium Access Control, MAC, layer, etc.) signaling.

In NR, a physical channel and a reference signal may be transmitted using beam-forming. When beam-forming-based signal transmission is supported, a beam management process may be performed to align beams between a base station and a terminal. Also, the signal proposed in the present disclosure may be transmitted / received using beam-forming. In the radio resource control (RRC) IDLE mode, beam alignment may be performed based on SSB. On the other hand, beam alignment in RRC CONNECTED mode may be performed based on CSI-RS (in DL) and SRS (in UL). On the other hand, when beam-forming-based signal transmission is not supported, a beam-related operation may be omitted in the following description.

Referring to FIG. 43, a base station (eg, BS) may periodically transmit an SSB (S702). Here, the SSB includes PSS / SSS / PBCH. The SSB can be transmitted using beam sweeping. Thereafter, the base station may transmit Remaining Minimum System Information (RMSI) and Other System Information (OSI) (S704). The RMSI may include information (eg, PRACH configuration information) necessary for the UE to initially access the base station. Meanwhile, the terminal performs SSB detection and then identifies the best SSB. Thereafter, the terminal may transmit the RACH preamble (Message 1, Msg1) to the base station using the PRACH resource linked / corresponding to the index (ie, beam) of the best SSB (S706). The beam direction of the RACH preamble is associated with PRACH resources. Association between PRACH resources (and / or RACH preamble) and SSB (index) may be established through system information (eg, RMSI). Then, as part of the RACH process, the base station transmits a random access response (RAR) (Msg2) in response to the RACH preamble (S708), and the terminal uses Msg3 (eg, RRC Connection Request) using the UL grant in the RAR. Transmit (S710), the base station may transmit a contention resolution (contention resolution) message (Msg4) (S720). Msg4 may include RRC Connection Setup.

When an RRC connection is established between the base station and the UE through the RACH process, subsequent beam alignment may be performed based on SSB / CSI-RS (in DL) and SRS (in UL). For example, the terminal may receive SSB / CSI-RS (S714). SSB / CSI-RS may be used by the UE to generate a beam / CSI report. Meanwhile, the base station may request the beam / CSI report to the UE through DCI (S716). In this case, the UE may generate a beam / CSI report based on the SSB / CSI-RS and transmit the generated beam / CSI report to the base station through PUSCH / PUCCH (S718). The beam / CSI report may include beam measurement results, information on a preferred beam, and the like. The base station and the terminal can switch the beam based on the beam / CSI report (S720a, S720b).

Thereafter, the terminal and the base station may perform the procedures and / or methods described / proposed above. For example, the terminal and the base station process the information in the memory according to the proposal of the present disclosure based on the configuration information obtained in the network access process (eg, system information acquisition process, RRC connection process through RACH, etc.), and wireless signal. Or transmit the received wireless signal and store it in memory. Here, the radio signal may include at least one of PDCCH, PDSCH, and RS (Reference Signal) for downlink, and at least one of PUCCH, PUSCH, and SRS for uplink.

<DRX(Discontinuous Reception)><DRX (Discontinuous Reception)>

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

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

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

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

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

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

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

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

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

<유휴(idle) 모드 DRX><Idle mode DRX>

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

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

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

According to FIG. 44, the terminal may receive idle mode DRX configuration information from the base station through higher layer signaling (eg, system information) (S21).

The UE may determine a Paging Frame (PF) and a Paging Occasion (PO) to monitor the PDCCH in the paging DRX cycle based on the idle mode DRX configuration information (S22). In this case, the DRX cycle may include on duration and sleep duration (or chance of DRX).

The UE may monitor the PDCCH in the PO of the determined PF (S23). Here, for example, the UE monitors only one subframe (PO) per paging DRX cycle. In addition, when the UE receives a PDCCH scrambled by P-RNTI during on-duration (that is, when paging is detected), the UE transitions to the connection mode and can transmit and receive data with the base station.

<연결 모드 DRX(Connected mode DRX(C-DRX))><Connected mode DRX (C-DRX)>

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

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

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

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

45 illustrates the DRX cycle.

Referring to FIG. 45, the DRX cycle is composed of 'On Duration' and 'Opportunity for DRX'. The DRX cycle defines a time interval during which 'On Duration' is periodically repeated. 'On Duration' indicates a time period that the UE monitors to receive the PDCCH. When DRX is set, the UE performs PDCCH monitoring during 'On Duration'. When there is a successfully detected PDCCH during PDCCH monitoring, the terminal operates an inactivity timer and maintains an awake state. On the other hand, if there is no PDCCH successfully detected during PDCCH monitoring, the UE enters a sleep state after 'On Duration' is over. Accordingly, when DRX is set, PDCCH monitoring / reception may be discontinuously performed in the time domain in performing the above-described / suggested procedures and / or methods. For example, when DRX is set, in the present disclosure, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be set discontinuously according to the DRX setting. On the other hand, when DRX is not set, PDCCH monitoring / reception may be continuously performed in the time domain in performing the above-described / suggested procedures and / or methods. For example, if DRX is not set, the PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously set in the present disclosure. Meanwhile, regardless of whether DRX is set, PDCCH monitoring may be limited in a time interval set as a measurement gap.

Table 10 shows a process of a terminal related to DRX (RRC_CONNECTED state). Referring to Table 10, DRX configuration information is received through higher layer (eg, RRC) signaling, and whether DRX ON / OFF is controlled by the DRX command of the MAC layer. When DRX is set, the UE may discontinuously perform PDCCH monitoring in performing the procedures and / or methods described / suggested in the present disclosure, as illustrated in FIG. U1.

Table 10

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

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

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

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

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

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

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

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

Referring to FIG. 46, the

wireless devices

100 and 200 may be composed of various elements. For example, the

wireless devices

100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit may include a communication circuit 112 and a transceiver (s) 114. For example, the communication circuit 112 can include one or more processors 102,202 and / or one or more memories 104,204. For example, the transceiver (s) 114 may include one or more transceivers 106,206 and / or one or more antennas 108,208. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls various operations of the wireless device. For example, the controller 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (eg, another communication device) through the wireless / wired interface through the communication unit 110 or externally (eg, through the communication unit 110). Information received through a wireless / wired interface from another communication device) may be stored in the memory unit 130.

The additional element 140 may be variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (FIGS. 47, 100A), vehicles (FIGS. 47, 100B-1, 100B-2), XR devices (FIGS. 47, 100C), portable devices (FIGS. 47, 100D), and household appliances. (Fig. 47, 100e), IoT device (Fig. 47, 100f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environment device, It may be implemented in the form of an AI server / device (FIGS. 47, 400), a base station (FIGS. 47, 200), a network node, or the like. The wireless device may be movable or used in a fixed place depending on the use-example / service.

In FIG. 46, various elements, components, units / parts, and / or modules in the

wireless devices

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

wireless devices

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

wireless devices

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

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

Referring to FIG. 47, the communication system 1 applied to the present disclosure includes a wireless device, a base station and a network. Here, the wireless device means a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), Long Term Evolution (LTE)), and may be referred to as a communication / wireless / 5G device. Although not limited to this, the wireless device includes a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a hand-held device 100d, and a home appliance 100e. ), Internet of Thing (IoT) devices 100f, and AI devices / servers 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (eg, a drone). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, Head-Mounted Device (HMD), Head-Up Display (HUD) provided in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, or the like. The mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a notebook, etc.). Household appliances may include a TV, a refrigerator, and a washing machine. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may also be implemented as wireless devices, and the specific wireless device 200a may operate as a base station / network node to other wireless devices.

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

Wireless communication /

connections

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

connections

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

connections

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

Vehicles or autonomous vehicles can be implemented as mobile robots, vehicles, trains, aerial vehicles (AVs), ships, and the like.

Referring to FIG. 48, the vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and autonomous driving. It may include a portion (140d). The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110/130 / 140a to 140d correspond to blocks 110/130/140 in FIG. 46, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, base stations (e.g. base stations, road side units, etc.) and servers. The controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The controller 120 may include an electronic control unit (ECU). The driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel on the ground. The driving unit 140a may include an engine, a motor, a power train, wheels, brakes, and steering devices. The power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100 and may include a wired / wireless charging circuit, a battery, and the like. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like. The sensor unit 140c includes an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, and a vehicle forward / Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, and the like. The autonomous driving unit 140d maintains a driving lane, automatically adjusts speed, such as adaptive cruise control, and automatically moves along a predetermined route, and automatically sets a route when a destination is set. Technology, etc. can be implemented.

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

49 illustrates a vehicle applied to the present disclosure.

Vehicles can also be implemented as vehicles, trains, aircraft, ships, and the like.

Referring to FIG. 49, the vehicle 100 may include a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a, and a position measurement unit 140b. Blocks 110 to 130 / 140a to 140d correspond to blocks 110 to 130/140 in FIG. 46, respectively.

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

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

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

Referring to FIG. 50, the XR device 100a may include a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a, a sensor unit 140b, and a power supply unit 140c. . Here, blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130/140 in FIG. 46, respectively.

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

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

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

51 illustrates a robot applied to the present disclosure.

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

Referring to FIG. 51, the robot 100 may include a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a, a sensor unit 140b, and a driving unit 140c. Blocks 110 to 130 / 140a to 140d correspond to blocks 110 to 130/140 in FIG. 46, respectively.

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

52 illustrates an AI device applied to the present disclosure. AI devices can be fixed devices or mobile devices, such as TVs, projectors, smartphones, PCs, laptops, digital broadcast terminals, tablet PCs, wearable devices, set-top boxes (STBs), radios, washing machines, refrigerators, digital signage, robots, vehicles, etc. It can be implemented as a possible device.

Referring to FIG. 52, the AI device 100 includes a communication unit 110, a control unit 120, a memory unit 130, an input / output unit 140a / 140b, a running processor unit 140c, and a sensor unit 140d It may include. Blocks 110 to 130 / 140a to 140d correspond to blocks 110 to 130/140 in FIG. 46, respectively.

The communication unit 110 uses wired / wireless communication technology to communicate with external devices such as other AI devices (e.g., W1, 100x, 200, 400) or AI servers (e.g., 400 of Fig. W1) with wired / wireless signals (e.g., sensor information) , User input, learning model, control signals, etc.). To this end, the communication unit 110 may transmit information in the memory unit 130 to an external device or transmit a signal received from the external device to the memory unit 130.

The controller 120 may determine at least one executable action of the AI device 100 based on information determined or generated using a data analysis algorithm or a machine learning algorithm. Then, the control unit 120 may control the components of the AI device 100 to perform the determined operation. For example, the control unit 120 may request, search, receive, or utilize data of the learning processor unit 140c or the memory unit 130, and may be determined to be a predicted operation or desirable among at least one executable operation. Components of the AI device 100 may be controlled to perform an operation. In addition, the control unit 120 collects history information including the user's feedback on the operation content or operation of the AI device 100 and stores it in the memory unit 130 or the running processor unit 140c, or the AI server ( W1, 400). The collected history information can be used to update the learning model.

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

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

The learning processor unit 140c may train a model composed of artificial neural networks using the training data. The learning processor unit 140c may perform AI processing together with the learning processor unit of the AI server (FIGS. W1 and 400). The learning processor unit 140c may process information received from an external device through the communication unit 110 and / or information stored in the memory unit 130. Also, the output value of the learning processor unit 140c may be transmitted to an external device through the communication unit 110 and / or stored in the memory unit 130.

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

The NR frequency band may be defined as a frequency range of two types (FR1, FR2). The numerical value of the frequency range may be changed, and for example, the frequency ranges of the two types (FR1, FR2) may be as shown in Table 11 below. For convenience of explanation, FR1 of the frequency range used in the NR system may mean “sub 6 GHz range”, and FR2 may mean “above 6 GHz range” and may be referred to as millimeter wave (mmW). .

[Table 11]

As described above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a band of 410MHz to 7125MHz as shown in Table 12 below. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more included in FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, for example, for communication for vehicles (eg, autonomous driving).

Table 12

The claims described herein can be combined in various ways. For example, the technical features of the method claims of the present specification may be combined and implemented as a device, and the technical features of the device claims of the specification may be combined and implemented as a method. Further, the technical features of the method claim of the present specification and the technical features of the device claim may be combined and implemented as a device, and the technical features of the method claim of the method and the device claims of the present specification may be combined and implemented as a method.

Claims

In the method for the terminal to communicate with the base station in the unlicensed band,

Receiving the configured grant allocation information informing the resource that can be used for uplink transmission of a configured grant (configured grant) method from the base station, the resource is a sub-unit that the channel performs a channel access procedure (channel access procedure) Includes two or more bands in the frequency domain,

A channel access procedure is performed in each of the two or more sub-bands, and

Within a channel occupancy time (COT) secured as a result of performing the channel access procedure, an uplink signal is transmitted only in a specific subband capable of uplink transmission among the two or more subbands,

And transmitting information indicating the specific sub-band to the base station.
The method of claim 1, wherein the uplink control information included in the first uplink signal transmitted for the first time in the COT includes information that an actual band in which the first uplink signal is transmitted is unknown for a predetermined time. , The uplink control information included in the second transmitted uplink signal includes information indicating an actual band in which the second uplink signal is transmitted.
The method of claim 2, wherein the predetermined time is a specific time immediately after the transmission of the first uplink signal, and is a predetermined value, a value set by the base station, or a fixed value.
The method of claim 3, wherein a downlink signal is received from the base station only through a predetermined reference subband among the two or more subbands within the predetermined time.
The method of claim 1, wherein a downlink signal from the base station is received only through the specific subband in the COT.
The method of claim 1, wherein the uplink control information included in the first uplink signal transmitted for the first time in the COT includes information indicating a subband that is a minimum unit for performing a channel access procedure for a predetermined time. A method of uplink control information included in a second uplink signal transmitted next includes information indicating an actual band in which the second uplink signal is transmitted.
The method of claim 1, wherein the uplink signal is transmitted only when a channel access procedure is successful in a predetermined reference subband among the two or more subbands.
The method of claim 1, wherein a sequence of a demodulation reference signal used for demodulation of the uplink signal is configured differently according to the specific subband.
The method of claim 8, wherein the base station identifies the specific subband based on the sequence of the demodulation reference signal.
The method of claim 1, wherein the sub-band is 20 MHz (Mega-Hertz).
The method of claim 1, wherein the established grant scheme is a transmission scheme that transmits an uplink data channel through periodic resources configured through an upper layer signal without an uplink grant.
The terminal,

Transceiver for transmitting and receiving a wireless signal (Transceiver); And

A processor that operates in conjunction with the transceiver; includes, but, the processor,

Sub-band, which is a unit for performing a channel access procedure, receives the configured grant allocation information informing a resource that can be used for uplink transmission of a configured grant method from a base station. 2 or more in the frequency domain,

A channel access procedure is performed in each of the two or more subbands,

Within a channel occupancy time (COT) secured as a result of performing the channel access procedure, an uplink signal is transmitted only in a specific subband capable of uplink transmission among the two or more subbands,

A terminal characterized in that for transmitting the information informing the specific sub-band to the base station.
The processor for the wireless communication device,

By controlling the wireless communication device,

Sub-band, which is a unit for performing a channel access procedure, receives the configured grant allocation information informing a resource that can be used for uplink transmission of a configured grant method from a base station. 2 or more in the frequency domain,

A channel access procedure is performed in each of the two or more subbands,

Within a channel occupancy time (COT) secured as a result of performing the channel access procedure, an uplink signal is transmitted only in a specific subband capable of uplink transmission among the two or more subbands,

And transmitting information indicating the specific sub-band to the base station.