Method and apparatus for operating in a wireless communication system

Abstract

The present application relates to a method and apparatus operating in a wireless communication system. In various embodiments of the disclosure, a method performed by a user equipment (UE) configured to operate in a wireless communication system is disclosed, the method comprising: receiving first information about a plurality of groups, wherein the plurality of groups are respectively associated with at least one search space set; monitoring a physical downlink control channel (PDCCH) according to at least one search space set associated with one of the plurality of groups based on the first information; based on a first downlink control information (DCI) obtained by monitoring the PDCCH scheduling an uplink transmission in a grant-free band, performing a channel access procedure (CAP) for the uplink transmission to access the grant-free band, and performing the uplink transmission based on the CAP.

Description

[0001] This application is a divisional application of the original patent application No. 202080018296.3 (International Application No.: PCT / KR2020 / 000519, Application Date: January 10, 2020, Invention Title: Method for transmitting and receiving signals in a wireless communication system and apparatus thereon). Technical Field

[0002] Embodiments of this disclosure relate to wireless communication systems, and more specifically, to a method and apparatus for transmitting and receiving signals in a wireless communication system. Background Technology

[0003] Wireless access systems have been widely deployed to provide various types of communication services such as voice or data. Typically, a wireless access system is a multiple access system that supports communication among multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA).

[0004] With many communication devices requiring higher communication capacity, the need for mobile broadband communications, which significantly improves upon existing radio access technologies (RATs), is increasing. Furthermore, large-scale machine-type communications (MTC) is being considered in next-generation communication systems, enabling the provision of various services anytime, anywhere by interconnecting numerous devices or things. In addition, communication system designs capable of supporting services / UEs sensitive to reliability and latency have been discussed.

[0005] As mentioned above, the introduction of next-generation RATs that take into account enhanced mobile broadband communications, massive MTC, ultra-reliable and low-latency communications (URLLC) has been discussed. Summary of the Invention

[0006] Technical issues

[0007] Various embodiments of this disclosure provide a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0008] For example, various embodiments of this disclosure may provide a method and apparatus for transmitting and receiving initial signals, including information relating to transmission bursts, in a wireless communication system.

[0009] For example, various embodiments of this disclosure may provide a method and apparatus for transmitting and receiving physical downlink control channels (PDCCH) in a wireless communication system based on search space set switching.

[0010] For example, various embodiments of this disclosure may provide a method and apparatus for performing cross-carrier scheduling (CCS) in a wireless communication system.

[0011] Those skilled in the art will understand that the purposes that can be achieved using this disclosure are not limited to those specifically described above, and the above and other purposes that can be achieved using this disclosure will become clearer from the following detailed description.

[0012] Technical solution

[0013] Various embodiments of this disclosure provide a method and apparatus for transmitting and receiving signals in a wireless communication system.

[0014] According to various embodiments of the present disclosure, a method performed by a device in a wireless communication system can be provided.

[0015] According to an exemplary implementation, the method may include the steps of: obtaining information about a group of at least one search space set related to physical downlink control channel (PDCCH) monitoring, the group including a first group and a second group; and performing PDCCH monitoring based on the information about the group.

[0016] According to an exemplary implementation, PDCCH monitoring is performed based on a search space set associated with one of the plurality of groups, and based on satisfying at least one predetermined condition, (i) PDCCH monitoring may begin based on a search space set associated with another of the plurality of groups that is different from said one group, and (ii) PDCCH monitoring may end based on a search space set associated with said one group.

[0017] According to an exemplary implementation, PDCCH monitoring is performed based on a search space set associated with the second group, and based on downlink control information (DCI) indicating information related to channel occupancy time (COT), (i) PDCCH monitoring may begin after COT based on a search space set associated with the first group, and (ii) PDCCH monitoring may end after COT based on a search space set associated with the second group.

[0018] According to an exemplary implementation, the at least one search space set may be configured in an unlicensed frequency band.

[0019] According to an exemplary implementation, the DCI may also indicate information related to frequency resources occupied in the unlicensed band.

[0020] According to an exemplary implementation, the size of the frequency resource can be N times the size of the frequency unit performing the unlicensed band access procedure (CAP), and N can be a natural number.

[0021] According to an exemplary implementation, the search space set associated with the first group in the time domain may be located outside the COT, and the search space set associated with the second group in the time domain may be located within the COT.

[0022] According to an exemplary implementation, in the time domain, a search space set associated with the first group can be periodically configured based on a first periodicity.

[0023] According to an exemplary implementation, in the time domain, a search space set associated with the second group can be periodically configured based on a second periodicity that is different from the first periodicity.

[0024] According to an exemplary implementation, information about a group can be obtained based on higher-level signaling.

[0025] According to an exemplary implementation, based on configuring discontinuous reception (DRX) for the device, PDCCH monitoring can be performed during the on-duration of DRX.

[0026] According to various embodiments of the present disclosure, an apparatus configured to operate in a wireless communication system may be provided.

[0027] According to an exemplary embodiment, the device may include at least one memory and at least one processor connected to the at least one memory.

[0028] According to an exemplary embodiment, the at least one processor may be configured to: obtain information about a group of at least one search space set related to physical downlink control channel (PDCCH) monitoring, wherein the group includes a first group and a second group, and perform PDCCH monitoring based on the information about the group.

[0029] According to an exemplary implementation, PDCCH monitoring is performed based on a search space set associated with the second group, and based on downlink control information (DCI) indicating information related to channel occupancy time (COT), (i) PDCCH monitoring may begin after COT based on a search space set associated with the first group, and (ii) PDCCH monitoring may end after COT based on a search space set associated with the second group.

[0030] According to an exemplary embodiment, the device may be configured to communicate with at least one of a mobile terminal, a network, or an autonomous vehicle other than a vehicle including the device.

[0031] According to various embodiments of the present disclosure, a method performed by a device in a wireless communication system can be provided.

[0032] According to an exemplary embodiment, the method may include the steps of: sending information about a group of at least one search space set related to PDCCH monitoring, wherein the group includes a first group and a second group; and sending PDCCH related to the information about the group.

[0033] According to various embodiments of the present disclosure, an apparatus configured to operate in a wireless communication system may be provided.

[0034] According to an exemplary embodiment, the device may include at least one memory and at least one processor connected to the at least one memory.

[0035] According to an exemplary embodiment, the at least one processor may be configured to: send information about a group of at least one search space set related to PDCCH monitoring, wherein the group includes a first group and a second group, and send PDCCH related to the information about the group.

[0036] According to various embodiments of the present disclosure, an apparatus configured to operate in a wireless communication system may be provided.

[0037] According to an exemplary embodiment, the apparatus may include at least one processor and at least one memory storing at least one instruction that causes the at least one processor to perform a method.

[0038] According to an exemplary embodiment, the method may include the following steps: obtaining information about groups of at least one search space set related to PDCCH monitoring, wherein the groups include a first group and a second group; and performing PDCCH monitoring based on the information about the groups.

[0039] According to various embodiments of the present disclosure, a processor-readable medium storing at least one instruction that causes at least one processor to perform a method can be provided.

[0040] According to an exemplary embodiment, the method may include the steps of: obtaining information about a group of at least one search space set related to physical downlink control channel (PDCCH) monitoring, wherein the group includes a first group and a second group; and performing PDCCH monitoring based on the information about the group.

[0041] The various embodiments of this disclosure described above are merely some preferred embodiments of this disclosure. Those skilled in the art can deduce and understand many embodiments that reflect the technical features of the various embodiments of this disclosure based on the following detailed description.

[0042] Beneficial effects

[0043] According to various embodiments of this disclosure, the following effects can be achieved.

[0044] According to various embodiments of this disclosure, a method and apparatus for transmitting and receiving signals in a wireless communication system can be provided.

[0045] Furthermore, according to various embodiments of this disclosure, the user equipment (UE) can know the presence of opportunistic base station (BS) transmission based on the initial signal after the successful channel access procedure (CAP), and accordingly receive the physical downlink control channel (PDCCH) and / or physical downlink shared channel (PDSCH) and / or measurement channel state information (CSI).

[0046] Furthermore, according to various embodiments of this disclosure, the power consumption of the UE during PDCCH monitoring within the channel occupancy time (COT) of the BS can be reduced.

[0047] Furthermore, according to various embodiments of this disclosure, the probability of successful transmission and reception of downlink control information (DCI) can be increased.

[0048] Those skilled in the art will understand that the effects that can be achieved using this disclosure are not limited to those specifically described above, and other advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings. Attached Figure Description

[0049] The accompanying drawings are included to provide a further understanding of this disclosure and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the disclosure and, together with the description, serve to illustrate the principles of the disclosure. In the drawings:

[0050] Figure 1 This is a diagram illustrating physical channels that can be used in various embodiments of this disclosure and signal transmission methods using these physical channels.

[0051] Figure 2 This is a diagram illustrating the radio frame structure in a Long Term Evolution (LTE) system to which various embodiments of this disclosure are applicable.

[0052] Figure 3 This is a diagram illustrating the radio frame structure in an LTE system to which various embodiments of this disclosure are applicable.

[0053] Figure 4 This is a diagram illustrating the time slot structure in an LTE system to which various embodiments of this disclosure are applicable.

[0054] Figure 5 This is a diagram illustrating the uplink (UL) subframe structure in an LTE system to which various embodiments of this disclosure are applicable.

[0055] Figure 6This is a diagram illustrating the downlink (DL) subframe structure in an LTE system to which various embodiments of this disclosure are applicable.

[0056] Figure 7 This is a diagram illustrating the radio frame structure in a new radio access technology (NR) system to which various embodiments of this disclosure are applicable.

[0057] Figure 8 This is a diagram illustrating the time slot structure in an NR system to which various embodiments of this disclosure are applicable.

[0058] Figure 9 This is a diagram illustrating the self-contained time slot structure to which various embodiments of this disclosure are applicable.

[0059] Figure 10 This is a diagram illustrating the structure of a resource element group (REG) in an NR system to which various embodiments of this disclosure are applicable.

[0060] Figure 11 This is a diagram illustrating exemplary control channel element (CCE) to resource element group (REG) mapping types according to various embodiments of the present disclosure.

[0061] Figure 12 This is a diagram illustrating exemplary block interleavers according to various embodiments of the present disclosure.

[0062] Figure 13 This is a diagram illustrating exemplary time slot formats according to various embodiments of the present disclosure.

[0063] Figure 14 This is a diagram illustrating exemplary resource sharing for enhanced mobile broadband (eMBB) transmission and ultra-reliable low-latency communication (URLLC) transmission according to various embodiments of the present disclosure.

[0064] Figure 15 This is a diagram illustrating exemplary DL preemption instructions according to various embodiments of the present disclosure.

[0065] Figure 16 This is a diagram illustrating exemplary preemption operations according to various embodiments of the present disclosure.

[0066] Figure 17 This is a diagram illustrating an exemplary method of representing preemption instruction information in bitmap form according to various embodiments of the present disclosure.

[0067] Figure 18 This is a diagram illustrating exemplary multiplexing between short PUCCH and long PUCCH and UL signals according to various embodiments of the present disclosure.

[0068] Figure 19This is a diagram illustrating an exemplary wireless communication system supporting unlicensed frequency bands to which various embodiments of this disclosure are applicable.

[0069] Figure 20 This is a flowchart illustrating the DL channel access procedure (CAP) for transmissions in unlicensed frequency bands to which various embodiments of this disclosure are applicable.

[0070] Figure 21 This is a flowchart illustrating the various embodiments of this disclosure to which UL CAP applies for transmissions in unlicensed frequency bands.

[0071] Figure 22 This is a diagram illustrating exemplary structures for transmitting and receiving initial signals according to various embodiments of the present disclosure.

[0072] Figure 23 This is a diagram illustrating the signal flow of exemplary methods for transmitting and receiving initial signals according to various embodiments of the present disclosure.

[0073] Figure 24 This is a diagram illustrating exemplary physical downlink control signal (PDCCH) transmission and reception structures according to various embodiments of the present disclosure.

[0074] Figure 25 This is a diagram illustrating exemplary PDCCH transmission and reception structures according to various embodiments of the present disclosure.

[0075] Figure 26 This is a diagram illustrating exemplary PDCCH transmission and reception structures according to various embodiments of the present disclosure.

[0076] Figure 27 This is a diagram illustrating the signal flow of exemplary methods for transmitting and receiving PDCCH according to various embodiments of the present disclosure.

[0077] Figure 28 This is a diagram illustrating the signal flow of exemplary scheduling methods according to various embodiments of the present disclosure.

[0078] Figure 29 This is a simplified diagram illustrating the initial network access and subsequent communication process according to various embodiments of the present disclosure.

[0079] Figure 30 This is a diagram illustrating exemplary discontinuous reception (DRX) operation according to various embodiments of the present disclosure.

[0080] Figure 31 This is a simplified diagram illustrating the signal flow of exemplary methods for operating user equipment (UE) and base station (BS) according to various embodiments of the present disclosure.

[0081] Figure 32This is a flowchart illustrating a method of operating a UE according to various embodiments of the present disclosure.

[0082] Figure 33 This is a flowchart illustrating a method of operating a BS according to various embodiments of the present disclosure.

[0083] Figure 34 This is a block diagram illustrating an apparatus for implementing various embodiments of the present disclosure.

[0084] Figure 35 This is a diagram illustrating a communication system to which various embodiments of this disclosure are applicable.

[0085] Figure 36 This is a block diagram illustrating various embodiments of the present disclosure to which wireless devices are applicable.

[0086] Figure 37 This is a block diagram illustrating another example of a wireless device to which various embodiments of this disclosure are applicable.

[0087] Figure 38 This is a block diagram illustrating a portable device applied to various embodiments of the present disclosure.

[0088] Figure 39 This is a block diagram illustrating a vehicle or autonomous vehicle applied to various embodiments of this disclosure.

[0089] Figure 40 This is a block diagram illustrating a vehicle applied to various embodiments of this disclosure. Detailed Implementation

[0090] The various embodiments of this disclosure described below are specific combinations of elements and features of the various embodiments of this disclosure. Unless otherwise mentioned, these elements or features are to be considered optional. Individual elements or features may be practiced without combination with other elements or features. In addition, the various embodiments of this disclosure may be constructed by combining portions of elements and / or features. The order of operations described in the various embodiments of this disclosure may be rearranged. Some constructions or elements of any embodiment may be included in another embodiment and may be replaced by corresponding constructions or features of another embodiment.

[0091] In the description of the accompanying drawings, detailed descriptions of known processes or steps of various embodiments of this disclosure will avoid obscuring the subject matter of these embodiments. Furthermore, processes or steps that are readily understood by those skilled in the art will not be described further.

[0092] Throughout the specification, when a particular part "includes" a particular component, unless otherwise specified, this indicates that other components are not excluded but may be further included. The terms "unit," "device," and "module" described in the specification indicate a unit for performing at least one function or operation, which may be implemented by hardware, software, or a combination thereof. Furthermore, in the context of the various embodiments of this disclosure (more specifically, in the context of the following claims), unless otherwise indicated in the specification or unless the context clearly indicates otherwise, the terms "a," "an," "the," etc., may include both singular and plural representations.

[0093] In various embodiments of this disclosure, the data transmission and reception relationship between a base station (BS) and a user equipment (UE) is primarily described. A BS refers to a terminal node of the network that communicates directly with the UE. Specific operations described as being performed by the BS can be performed by upper-layer nodes of the BS.

[0094] That is, it is obvious that in a network consisting of multiple network nodes including the BS, various operations performed for communication with the UE can be performed by the BS or network nodes other than the BS. The term "BS" can be replaced by fixed station, node B, evolved Node B (eNode B or eNB), gNode B (gNB), advanced base station (ABS), access point, etc.

[0095] In various embodiments of this disclosure, the term terminal may be replaced by UE, mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, advanced mobile station (AMS), etc.

[0096] The transmitting end is a fixed and / or mobile node that provides data or voice services, and the receiving end is a fixed and / or mobile node that receives data or voice services. Therefore, on the uplink (UL), the UE can act as the transmitting end, and the BS can act as the receiving end. Similarly, on the downlink (DL), the UE can act as the receiving end, and the BS can act as the transmitting end.

[0097] Various embodiments of this disclosure can be supported by standard specifications disclosed for at least one radio access system, including IEEE 802.xx systems, 3GPP systems, 3GPP Long Term Evolution (LTE) systems, 3GPP 5G NR systems, and 3GPP2 systems. Specifically, various embodiments of this disclosure can be supported by standard specifications 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321, 3GPP TS 36.331, 3GPP TS 37.213, 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321, and 3GPP TS 38.331. That is, steps or parts not described in the various embodiments of this disclosure may be explained by the aforementioned standard specifications in order to clearly reveal the technical concept of the various embodiments of this disclosure. All terms used in the various embodiments of this disclosure may be explained by these standard specifications.

[0098] Various embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The detailed description given below with reference to the accompanying drawings is intended to illustrate exemplary embodiments of the present disclosure, and not to show only embodiments that can be implemented according to the present disclosure.

[0099] The following detailed description includes specific terminology in order to provide a thorough understanding of the various embodiments of this disclosure. However, it will be apparent to those skilled in the art that the specific terminology may be replaced with other terms without departing from the technical spirit and scope of the various embodiments of this disclosure.

[0100] The following sections describe 3GPP LTE / LTE-A and 3GPP NR systems as examples of wireless access systems.

[0101] Various embodiments of this disclosure can be applied to various wireless access systems such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc.

[0102] CDMA can be implemented as radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rate GSM Evolution (EDGE). OFDMA can be implemented as radio technologies such as IEEE 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc.

[0103] UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP LTE is part of the evolution of UMTS (E-UMTS) using E-UTRA, employing OFDMA for DL ​​and SC-FDMA for UL. LTE-advanced (LTE-A) is an evolution of 3GPP LTE.

[0104] Although various embodiments of this disclosure are described in the context of 3GPP LTE / LTE-A systems and 3GPP NR systems in order to illustrate the technical features of various embodiments of this disclosure, various embodiments of this disclosure are also applicable to IEEE 802.16e / m systems, etc.

[0105] 1.3 Overview of the GPP System

[0106] 1.1. Physical Channels and General Signal Transmission

[0107] In a radio access system, the UE receives information from the base station on the DL and transmits information to the base station on the UL. The information transmitted and received between the UE and the base station includes general data information and various types of control information. Depending on the type / purpose of the information transmitted and received between the base station and the UE, there are many physical channels.

[0108] Figure 1 This is a diagram illustrating physical channels that can be used in various embodiments of this disclosure and signal transmission methods using these physical channels.

[0109] When the UE is powered on or enters a new cell, the UE performs an initial cell search (S11). The initial cell search involves obtaining synchronization with the BS. Specifically, the UE synchronizes its timing with the base station and obtains information such as the cell identifier (ID) by receiving the primary synchronization channel (P-SCH) and secondary synchronization channel (S-SCH) from the BS.

[0110] Then, the UE can obtain the information broadcast in the cell by receiving the Physical Broadcast Channel (PBCH) from the base station.

[0111] During the initial cell search, the UE can monitor the DL channel status by receiving the downlink reference signal (DL RS).

[0112] After the initial cell search, the UE can obtain more detailed system information by receiving the Physical Downlink Control Channel (PDCCH) and receiving information on the Physical Downlink Shared Channel (PDSCH) based on the PDCCH (S12).

[0113] Subsequently, to establish a connection with the eNB, the UE may perform a random access procedure with the eNB (S13 to S16). During the random access procedure, the UE may transmit a preamble on the Physical Random Access Channel (PRACH) (S13), and may receive the PDCCH and the Random Access Response (RAR) to the preamble on the PDSCH associated with the PDCCH (S14). The UE may use the scheduling information in the RAR to transmit the PUSCH (S15) and perform a contention resolution procedure, including receiving the PDCCH signal and the PDSCH signal corresponding to the PDCCH signal (S16).

[0114] When the random access procedure is performed in two steps, steps S13 and S15 can be performed in one operation for UE transmission, and steps S14 and S16 can be performed in one operation for BS transmission.

[0115] Following the above process, during the general UL / DL signal transmission process, the UE may receive the PDCCH and / or PDSCH from the BS (S17) and send the Physical Uplink Shared Channel (PUSCH) and / or Physical Uplink Control Channel (PUCCH) to the BS (S18).

[0116] The control information sent by the UE to the BS is generally called uplink control information (UCI). UCI includes Hybrid Automatic Repeat Request Acknowledgment / Negative Acknowledgment (HARQ-ACK / NACK), Scheduling Request (SR), Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), Rank Indicator (RI), etc.

[0117] Typically, UCIs are sent periodically on the PUCCH. However, if control information and service data should be sent simultaneously, they can be sent on the PUSCH. Additionally, UCIs can be sent aperiodically on the PUSCH when a request / command is received from the network.

[0118] 1.2. Radio Frame Structure

[0119] Figure 2 and Figure 3 The radio frame structure in an LTE system to which various embodiments of this disclosure are applicable is illustrated.

[0120] The LTE system supports frame structure type 1 for Frequency Division Duplex (FDD), frame structure type 2 for Time Division Duplex (TDD), and frame structure type 3 for Unlicensed Cells (UCells). In an LTE system, up to 31 secondary cells (SCells) can be aggregated in addition to the primary cell (PCell). Unless otherwise specified, the following operations can be applied independently on a cell-by-cell basis.

[0121] In multi-cell aggregation, different frame structures can be used for different cells. In addition, time resources within a frame structure (e.g., subframes, time slots, and sub-time slots) can be collectively referred to as time units (TUs).

[0122] Figure 2 (a) shows frame structure type 1. Frame type 1 is applicable to both full frequency division duplex (FDD) and half-FDD systems.

[0123] A DL radio frame is defined by 10 1ms subframes. Depending on the cyclic prefix (CP), a subframe may contain either 14 or 12 symbols. Under normal CP, a subframe contains 14 symbols, while under extended CP, a subframe contains 12 symbols.

[0124] Depending on the multiple access scheme, the symbol can be an OFDM(A) symbol or an SC-FDM(A) symbol. For example, the symbol can refer to an OFDM(A) symbol on the DL and an SC-FDM(A) symbol on the UL. The OFDM(A) symbol can be referred to as a Cyclic Prefix-OFDMA(A) (CP-OFDM(A)) symbol, and the SC-FDM(A) symbol can be referred to as a Discrete Fourier Transform-Extended-OFDM(A) (DFT-s-OFDM(A)) symbol.

[0125] A subframe can be defined by one or more time slots according to the subcarrier spacing (SCS).

[0126] - When SCS = 7.5kHz or 15kHz, subframe #i is defined by two 0.5ms time slots, time slot #2i and time slot #2i+1 (i = 0 to 9).

[0127] - When SCS = 1.25kHz, subframe #i is defined by a 1ms time slot, time slot #2i.

[0128] - When SCS = 15kHz, subframe #i can be defined by six sub-slots as shown in Table 1.

[0129] Table 1 lists an exemplary sub-slot configuration for a subframe (normal CP).

[0130] [Table 1]

[0131]

[0132] Figure 2 (b) shows frame structure type 2. Frame structure type 2 is used in TDD systems. Frame structure type 2 consists of two half-frames. A half-frame consists of 4 (or 5) general subframes and 1 (or 0) special subframes. Depending on the UL-DL configuration, the general subframes are used for UL or DL. A subframe consists of two time slots.

[0133] Table 2 lists exemplary subframe configurations for radio frames configured according to UL-DL.

[0134] [Table 2]

[0135]

[0136] In Table 2, D represents the DL subframe, U represents the UL subframe, and S represents the special subframe. Special subframes include the downlink pilot time slot (DwPTS), the guard period (GP), and the uplink pilot time slot (UpPTS). The DwPTS is used for initial cell search, synchronization, or channel estimation at the UE. The UpPTS is used for channel estimation at the eNB and for obtaining UL transmission synchronization at the UE. The GP is a period used to eliminate UL interference caused by multipath delay of the DL signal between the DL and UL.

[0137] Table 3 lists exemplary special subframe configurations.

[0138] [Table 3]

[0139]

[0140] In Table 3, X is configured by higher-level signaling (e.g., Radio Resource Control (RRC) signaling, etc.) or is given as 0.

[0141] Figure 3 This is a diagram illustrating frame structure type 3.

[0142] Frame structure type 3 can be applied to UCell operations. Frame structure type 3 can be applied to (but is not limited to) Licensed Assisted Access (LAA) SCells with normal CP. The frame duration is 10 ms, consisting of 10 1 ms subframes. Subframe #i is defined by two consecutive time slots, time slot #2i and time slot #2i+1. Each subframe in the frame can be used for DL ​​or UL transmissions, or can be empty. DL transmissions occupy one or more consecutive subframes, starting at any time within the subframe and ending at the subframe boundary or in the DwPTS in Table 3. UL transmissions occupy one or more consecutive subframes.

[0143] Figure 4 This is a diagram illustrating the time slot structure in an LTE system to which various embodiments of this disclosure are applicable.

[0144] Reference Figure 4 A time slot comprises multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. A symbol can refer to its duration. The time slot structure can consist of N... DL / UL RB N RB sc Subcarriers and N DL / UL symb A resource grid description with N symbols. DL RB N represents the number of RBs in the DL time slot. UL RB Indicates the number of RBs in the UL time slot. N DL RB and N UL RB It depends on the DL bandwidth and UL bandwidth, respectively. DL symb N represents the number of symbols in a DL time slot. UL symb Indicates the number of symbols in the UL time slot. N RB sc This indicates the number of subcarriers in a RB. The number of symbols in a time slot can vary depending on the SCS and CP length (see Table 1). For example, although a time slot includes 7 symbols in the normal CP case, a time slot includes 6 symbols in the extended CP case.

[0145] RB is defined as N in the time domain. DL / UL symb (For example, 7) consecutive symbols × N in the frequency domain RB sc (For example, 12) consecutive subcarriers. RBs can be physical resource blocks (PRBs) or virtual resource blocks (VRBs), with PRBs mapped one-to-one to VRBs. Two RBs, each located in one of the two slots of a subframe, are called an RB pair. The two RBs in an RB pair can have the same RB number (or RB index). A resource having one symbol × one subcarrier is called a resource element (RE) or tone. Each RE in the resource grid can be uniquely identified by an index pair (k, l) in the slot. k is from 0 to N. DL / UL RB xN RB sc Frequency domain index within the range of -1, where l is from 0 to N. DL / UL symb Time-domain index within the range of -1.

[0146] Figure 5 This is a diagram illustrating the UL subframe structure in an LTE system to which various embodiments of this disclosure are applicable.

[0147] Reference Figure 5 A subframe 500 includes two 0.5ms time slots 501. Each time slot includes multiple symbols 502, and each symbol corresponds to one SC-FDMA symbol. RB 503 is a resource allocation unit corresponding to one time slot in the time domain and 12 subcarriers in the frequency domain.

[0148] The UL subframe is broadly divided into a control area 504 and a data area 505. The data area is the communication resource used by each UE to transmit data such as voice and packets, including the Physical Uplink Shared Channel (PUSCH). The control area is the communication resource used by each UE to transmit ACK / NACK for DL ​​channel quality reports or DL ​​signals, UL scheduling requests, etc., including the Physical Uplink Control Channel (PUCCH).

[0149] The probe reference signal (SRS) is transmitted in the last SC-FDMA symbol of the subframe in the time domain.

[0150] Figure 6 This is a diagram illustrating the DL subframe structure in an LTE system to which various embodiments of this disclosure are applicable.

[0151] Reference Figure 6 At most three (or four) OFDM(A) symbols at the beginning of the first time slot of a subframe correspond to the control area. The remaining OFDM(A) symbols correspond to the data area allocated with PDSCH, and the basic resource unit of the data area is RB. DL control channels include the Physical Control Format Indicator Channel (PCFICH), the Physical Downlink Control Channel (PDCCH), and the Physical Hybrid ARQ Indicator Channel (PHICH), etc.

[0152] PCFICH is transmitted in the first OFDM symbol of a subframe, conveying information about the number of OFDM symbols used for control channel transmission in the subframe (i.e., the size of the control area). PHICH is the response channel for UL transmission, transmitting hybrid Automatic Repeat Request (HARQ) acknowledgment (ACK) / negative acknowledgment (NACK) signals. The control information transmitted on PDCCH is called downlink control information (DCI). DCI includes UL resource allocation information for any UE group, DL resource control information, or UL transmit (Tx) power control commands.

[0153] Figure 7 This is a diagram illustrating the radio frame structure in an NR system to which various embodiments of this disclosure are applicable.

[0154] NR systems can support multiple parameter sets. A parameter set can be defined by the subcarrier spacing (SCS) and cyclic prefix (CP) overhead. Multiple SCSs can be derived by scaling the default SCS according to an integer N (or μ). Furthermore, even assuming that very small SCSs are not used at very high carrier frequencies, the parameter set to be used can be selected independently of the cell's frequency band. In addition, NR systems can support various frame structures based on multiple parameter sets.

[0155] The OFDM parameter sets and frame structures that can be considered for NR systems will now be described. Several OFDM parameter sets supported by NR systems are defined as listed in Table 4. For the bandwidth portion, μ and CP are obtained from the RRC parameters provided by the BS.

[0156] [Table 4]

[0157] μ Δf = 2 μ • 15 [kHz]] Cyclic prefix 0 15 normal 1 30 normal 2 60 Normal, expansion 3 120 normal 4 240 normal

[0158] In NR, multiple parameter sets (e.g., SCS) are supported to support various 5G services. For example, a 15kHz SCS supports wide areas of the cellular band, a 30kHz / 60kHz SCS supports dense urban areas, lower latency, and wider carrier bandwidth, and an SCS of 60kHz or higher supports bandwidth greater than 24.25GHz to overcome phase noise.

[0159] The NR band is defined by two types of frequency ranges, FR1 and FR2. FR1 can be the range below 6 GHz, and FR2 can be the range above 6 GHz, i.e., the millimeter wave (mmWave) band.

[0160] As an example, Table 5 below defines the NR band.

[0161] [Table 5]

[0162] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0163] Regarding the frame structure in the NR system, the temporal size of various fields is represented by the NR's basic time unit T. c =1 / (△f) max *N f Multiples of ), where Δf max =480*10 3 Hz, and a value N related to the magnitude of the Fast Fourier Transform (FFT) or the Inverse Fast Fourier Transform (IFFT). f Given as N f =4096. T c and T s (Based on the LTE time unit and sampling time, given as T) s =1 / ((15kHz)*2048)) is set to the following relationship: Ts / T c =64. DL and UL transmissions are organized into groups, each with a T f =(△f max *N f / 100)*T c A radio frame has a duration of 10 ms. Each radio frame consists of 10 subframes, each subframe having a duration of T. sf =(△f max *N f / 100)*T c =1ms duration. There can be one set of frames for UL and one set of frames for DL. For parameter set μ, time slots are ordered in ascending order within the subframes, starting with n. μ s ∈{0, ..., N slot,μ subframe Numbered by -1} and in ascending order in radio frames by n μ s,f ∈{0, ...,N slot,μ frame -1} numbering. A time slot includes N μ symb N consecutive OFDM symbols, and N μ symb Depends on CP. Slot n in the subframe μ s The start of OFDM symbol n in the same subframe μ s *N μ symb The beginnings are aligned in time.

[0164] Table 6 lists the number of symbols per slot, the number of slots per frame, and the number of slots per subframe for each SCS under normal CP conditions. Table 7 lists the number of symbols per slot, the number of slots per frame, and the number of slots per subframe for each SCS under extended CP conditions.

[0165] [Table 6]

[0166]

[0167] [Table 7]

[0168]

[0169] In the table above, N slot symb N represents the number of symbols in a time slot. frame,μ slot N represents the number of time slots in a frame. subframe,μslot This indicates the number of time slots in a subframe.

[0170] In the NR systems to which the various embodiments of this disclosure are applicable, different OFDM(A) parameter sets (e.g., SCS, CP length, etc.) can be configured for multiple cells aggregated for a UE. Therefore, the (absolute time) period of time resources (collectively referred to as time units (TU) for convenience) comprising the same number of symbols (e.g., subframes (SF), slots, or TTI) can be configured differently for the aggregated cells.

[0171] Figure 7 An example is shown with μ = 2 (i.e., SCS of 60 kHz), where, referring to Table 6, a subframe can comprise four time slots. Figure 7 A subframe consists of {1, 2, 4} time slots, which is an example. The number of time slots that can be included in a subframe is defined as listed in Table 6 or Table 7.

[0172] In addition, mini slots can include 2, 4, or 7 symbols, less than 2 symbols, or more than 7 symbols.

[0173] Figure 8 This is a diagram illustrating the time slot structure in an NR system to which embodiments of this disclosure are applicable.

[0174] Reference Figure 8 A time slot comprises multiple symbols in the time domain. For example, a time slot includes 7 symbols in normal CP and 6 symbols in extended CP.

[0175] A carrier comprises multiple subcarriers in the frequency domain. An RB is defined by multiple (e.g., 12) consecutive subcarriers in the frequency domain.

[0176] A bandwidth portion (BWP) defined by multiple consecutive (P)RBs in the frequency domain can correspond to a set of parameters (e.g., SCS, CP length, etc.).

[0177] A carrier may include up to N (e.g., 5) BWPs. Data communication can be performed in the enabled BWPs, and only one BWP may be enabled for a single UE. In the resource grid, each element is called a RE, and a complex symbol can be mapped to an RE.

[0178] Figure 9 This is a diagram illustrating the self-contained time slot structure to which various embodiments of this disclosure are applicable.

[0179] A self-contained time slot structure refers to a time slot structure in which the DL control channel, DL / UL data, and UL control channel can all be included in a single time slot.

[0180] exist Figure 9In the diagram, shaded areas (e.g., symbol index = 0) indicate DL control areas, and black areas (e.g., symbol index = 13) indicate UL control areas. The remaining areas (e.g., symbol indices = 1 to 12) can be used for DL ​​or UL data transmission.

[0181] Based on this architecture, the BS and UE can sequentially perform DL and UL transmissions within a single time slot. That is, the BS and UE can not only send and receive DL data, but also send and receive UL ACK / NACK responses to the DL data within a single time slot. Therefore, this architecture reduces the time required for data retransmission in the event of a data transmission error, thereby minimizing the latency of the final data transmission.

[0182] In this self-contained time slot structure, a predetermined time slot is required to allow the BS and UE to switch from transmit mode to receive mode and vice versa. Therefore, in this self-contained time slot structure, some OFDM symbols during the switch from DL to UL can be configured as a protection period (GP).

[0183] Although the self-contained time slot structure described above includes both DL control regions and UL control regions, these control regions may be selectively included in the self-contained time slot structure. In other words, the self-contained time slot structure according to various embodiments of this disclosure can cover cases including only DL control regions or UL control regions, as well as cases including both DL control regions and UL control regions, such as... Figure 12 As shown.

[0184] Furthermore, the order of regions included in a time slot may vary depending on the implementation. For example, a time slot may include, in this order, a DL control region, a DL data region, a UL control region, and a UL data region, or in this order, a UL control region, a UL data region, a DL control region, and a DL data region.

[0185] PDCCH can be transmitted in the DL control area, and PDSCH can be transmitted in the DL data area. PUCCH can be transmitted in the UL control area, and PUSCH can be transmitted in the UL data area.

[0186] 1.3. Channel Structure

[0187] 1.3.1. DL Channel Structure

[0188] The BS sends relevant signals to the UE on the DL channel as described below, and the UE receives relevant signals from the BS on the DL channel.

[0189] 1.3.1.1. Physical Downlink Shared Channel (PDSCH)

[0190] The PDSCH transmits DL data (e.g., DL Shared Channel Transport Block (DL-SCH TB)) using modulation schemes such as Quadrature Phase Shift Keying (QPSK), 16QAM, 64QAM, or 256QAM. The TB is encoded as codewords. The PDSCH can transmit up to two codewords. Scrambling and modulation mapping are performed based on the codewords, and the modulation symbols generated from each codeword are mapped to one or more layers (layer mapping). Each layer, along with the demodulation reference signal (DMRS), is mapped to a resource, generating OFDM symbol signals, and transmitted through the corresponding antenna ports.

[0191] 1.3.1.2. Physical Downlink Control Channel (PDCCH)

[0192] The PDCCH can transmit downlink control information (DCI), such as DL data scheduling information and UL data scheduling information. The PUCCH can transmit uplink control information (UCI), such as acknowledgment / negative acknowledgment (ACK / NACK) for DL ​​data, channel state information (CSI), and scheduling requests (SR).

[0193] The PDCCH carries downlink control information (DCI) and is modulated using quadrature phase shift keying (QPSK). A PDCCH comprises 1, 2, 4, 8, or 16 control channel elements (CCEs) depending on the aggregation level (AL). A CCE comprises 6 resource element groups (REGs). A REG is defined by one OFDM symbol × one (P)RB.

[0194] Figure 10 This is a diagram illustrating the structure of a REG to which various embodiments of this disclosure are applicable.

[0195] exist Figure 10 In the symbol, D represents the RE to which the DCI is mapped, and R represents the RE to which the DMRS is mapped. The DMRS is mapped to RE#1, RE#5, and RE#9 along the frequency axis within a symbol.

[0196] The PDCCH is transmitted in a control resource set (CORESET). A CORESET is defined as a collection of REGs with a given set of parameters (e.g., SCS, CP length, etc.). Multiple CORESETs for a UE can overlap with each other in the time / frequency domain. CORESETs can be configured by system information (e.g., Master Information Block (MIB)) or UE-specific higher-layer (RRC) signaling. Specifically, the number of RBs and symbols (up to 3 symbols) included in a CORESET can be configured by higher-layer signaling.

[0197] For each CORESET, the precoder granularity in the frequency domain is set to one of the following via higher-layer signaling:

[0198] -sameAsREG-bundle: This is equal to the REG bundle size in the frequency domain.

[0199] -allContiguousRBs: This is equal to the number of adjacent RBs in the CORESET intrinsic frequency domain.

[0200] The REGs in a CORESET are numbered according to a time-priority mapping method. That is, starting from 0 of the first OFDM symbol of the lowest-numbered RB in the CORESET, the REGs are numbered in ascending order.

[0201] CORESET's CCE to REG mapping can be interleaved or non-interleaved.

[0202] Figure 11 This is a diagram illustrating exemplary CCE to REG mapping types according to various embodiments of this disclosure.

[0203] Figure 11 (a) is a diagram illustrating exemplary non-interleaved CCE to REG mappings according to various embodiments of the present disclosure.

[0204] - Non-interleaved CCE to REG mapping (or local CCE to REG mapping): The 6 REGs used for a given CCE are grouped into a REG bundle, and all REGs used for a given CCE are adjacent. One REG bundle corresponds to one CCE.

[0205] Figure 11 (b) is a diagram illustrating an exemplary interleaved CCE to REG mapping.

[0206] - Interleaved CCE to REG mapping (or distributed CCE to REG mapping): Two, three, or six REGs for a given CCE are grouped into a REG bundle, and the REG bundles are interleaved within a CORESET. In a CORESET containing one or two OFDM symbols, the REG bundle consists of two or six REGs, and in a CORESET containing three OFDM symbols, the REG bundle consists of three or six REGs. The REG bundle size is configured based on the CORESET.

[0207] Figure 12 Exemplary block interleavers according to various embodiments of this disclosure are shown.

[0208] For the interleaving operation described above, the number of rows A in the (block) interleaver is set to one of 2, 3, and 6. If the number of interleaving units used for a given CORESET is P, then the number of columns in the block interleaver is P / A. In the block interleaver, write operations are performed in the row-first direction and read operations are performed in the column-first direction, as shown in Figure C4. The cyclic shift (CS) of the interleaving unit is applied based on an ID that can be configured independently of the DMRS configurable ID.

[0209] The UE obtains the DCI transmitted on the PDCCH by decoding a set of PDCCH candidates (so-called blind decoding). The set of PDCCH candidates decoded by the UE is defined as the PDCCH search space set. The search space set can be a common search space (CSS) or a UE-specific search space (USS). The UE can obtain the DCI by monitoring PDCCH candidates in one or more search space sets configured by the MIB or higher-layer signaling. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with a CORESET configuration. A search space set is determined based on the following parameters.

[0210] -controlResourceSetId: The set of control resources associated with the search space set.

[0211] -monitoringSlotPeriodicityAndOffset: PDCCH monitors periodicity (in time slots) and PDCCH monitors offset (in time slots).

[0212] -monitoringSymbolsWithinSlot: PDCCH monitoring pattern within a PDCCH monitoring slot (e.g., the first symbol in CORESET).

[0213] -nrofCandidates: The number of PDCCH candidates for each AL = {1,2,4,8,16} (one of 0, 1, 2, 3, 4, 5, 6 and 8).

[0214] Table 8 lists exemplary features for each search space type.

[0215] [Table 8]

[0216]

[0217] Table 9 lists exemplary DCI formats sent on the PDCCH.

[0218] [Table 9]

[0219] DCI format use 0_0 PUSCH scheduling in a cell 0_1 PUSCH scheduling in a cell 1_0 PDSCH scheduling in a cell 1_1 PDSCH scheduling in a cell 2_0 Notify a group of UEs of the slot format 2_1 A group of UEs are notified that the UEs may assume that no PRB and OFDM symbols intended for use by that UE are being transmitted. 2_2 Transmit TPC commands to PUCCH and PUSCH 2_3 Transmit a set of TPC commands for SRS transmission to one or more UEs

[0220] DCI format 0_0 can be used to schedule PUSCH based on TB (or TB level), and DCI format 0_1 ​​can be used to schedule PUSCH based on TB (or TB level) or PUSCH based on code block group (CBG) (or CBG level). DCI format 1_0 can be used to schedule PDSCH based on TB (or TB level), and DCI format 1_1 can be used to schedule PDSCH based on TB (or TB level) or PDSCH based on CBG (or CBG level). DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic slot format indicator (SFI)) to the UE, and DCI format 2_1 is used to transmit DL preemption information to the UE. DCI format 2_0 and / or DCI format 2_1 can be transmitted to a group of UEs on the group common PDCCH (GC-PDCCH) (a PDCCH pointing to a group of UEs).

[0221] 1.3.2. UL Channel Structure

[0222] The UE sends relevant signals to the BS on the UL channel, which will be described later, and the BS receives relevant signals from the UE on the UL channel.

[0223] 1.3.2.1. Physical Uplink Shared Channel (PUSCH)

[0224] PUSCH transmits UL data (e.g., UL Shared Channel Transport Block (UL-SCH TB)) and / or UCI in either Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-Spread-Orthogonal Multiplexing (DFT-s-OFDM) waveforms. If PUSCH is transmitted in DFT-s-OFDM waveform, the UE transmits PUSCH by applying transform precoding. For example, if transform precoding is not possible (e.g., transform precoding is disabled), the UE may transmit PUSCH in CP-OFDM waveform, while if transform precoding is possible (e.g., transform precoding is enabled), the UE may transmit PUSCH in either CP-OFDM or DFT-s-OFDM waveform. PUSCH transmission can be dynamically scheduled by UL licenses in DCI, or semi-statically scheduled by higher-layer signaling (e.g., RRC signaling) (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (configured licenses). PUSCH transfers can be performed in a codebook-based or non-codebook-based manner.

[0225] 1.3.2.2. Physical Uplink Control Channel (PUCCH)

[0226] The PUCCH transmits UCI, HARQ-ACK, and / or SR, and is classified as short PUCCH or long PUCCH based on the duration of the PUCCH transmission. Table 10 lists exemplary PUCCH formats.

[0227] [Table 10]

[0228]

[0229] PUCCH format 0 transmits up to 2 bits of UCI and maps them in a sequence-based manner for transmission. Specifically, the UE sends a specific UCI to the eNB by transmitting one of multiple sequences on the PUCCH of PUCCH format 0. The UE only transmits the PUCCH of PUCCH format 0 in the PUCCH resource configured for the corresponding SR when it transmits a positive SR.

[0230] PUCCH format 1 transmits up to 2 bits of UCI, and the modulation symbols of UCI are extended in the time domain using OCC (configured differently depending on whether frequency hopping is performed). DMRS is transmitted in symbols that do not transmit modulation symbols (i.e., transmitted in time division multiplexing (TDM)).

[0231] PUCCH format 2 transmits more than 2 bits of UCI and the modulation symbols of DCI are transmitted with DMRS in frequency division multiplexing (FDM). DMRS is located at a density of 1 / 3 in symbols #1, #4, #7, and #10 of a given RB. A pseudo-noise (PN) sequence is used for the DMRS sequence. Frequency hopping can be enabled for 1-symbol PUCCH format 2.

[0232] PUCCH format 3 does not support UE multiplexing within the same PRBS and transmits more than 2 bits of UCI. In other words, PUCCH resources in PUCCH format 3 do not include OCC. Modulation symbols and DMRS are transmitted in TDM.

[0233] PUCCH format 4 supports multiplexing up to four UEs within the same PRBS and transmitting more than 2 bits of UCI. In other words, PUCCH resources in PUCCH format 3 include OCC. Modulation symbols and DMRS are transmitted in TDM.

[0234] 1.4. Bandwidth Component (BWP)

[0235] The various embodiments of this disclosure are applicable to NR systems that can allocate / support up to 400-MHz of frequency resources per component carrier (CC). If a UE operating in such a wideband CC keeps its radio frequency (RF) module always on for the entire CC, the UE's battery consumption may increase.

[0236] Alternatively, considering multiple use cases operating in a broadband CC (e.g., eMBB, URLLC, mMTC, V2X, etc.), different parameter sets (e.g., SCS) can be supported for different frequency bands of the CC.

[0237] Alternatively, each UE may have different maximum bandwidth capabilities.

[0238] In this regard, the BS can instruct / configure the UE to operate only within a portion of the broadband CC's bandwidth, rather than the total bandwidth. This portion of the bandwidth is called the Bandwidth Part (BWP).

[0239] BWP may include adjacent RBs in the frequency domain and correspond to a set of parameters (e.g., SCS, CP length, and / or slot / mini-slot duration).

[0240] A BS can configure one or more BWPs within a single CC configured for a UE. For example, a BS can configure a BWP occupying a relatively small frequency region within a PDCCH monitoring slot and schedule PDSCHs indicated (or scheduled) by the PDCCH within a larger BWP. Alternatively, if UEs are concentrated in a particular BWP, the BS can configure another BWP for some UEs for load balancing. Alternatively, for frequency domain inter-cell interference cancellation between adjacent cells, the BS can configure BWPs at both ends of the total bandwidth, except for some spectrum within the same time slot.

[0241] The BS can configure at least one DL / UL BWP for a UE associated with a broadband CC, enabling at least one of the DL / UL BWPs configured at a specific time (via L1 signaling (e.g., DCI, etc.), MAC signaling, or RRC signaling). The enabled DL / UL BWP can be referred to as the active DL / UL BWP. Before initial access or RRC connection establishment, the UE may not receive DL / UL BWP configuration from the BS. In this case, the DL / UL BWP assumed by the UE is defined as the initial active DL / UL BWP.

[0242] More specifically, according to various embodiments of this disclosure, the UE can perform the following BWP operations.

[0243] A UE that has been configured to operate a BWP in the serving cell has up to four DL BWPs configured in the DL bandwidth of the serving cell via higher-layer parameters (e.g., DL-BWP or BWP-Downlink) and up to four UL BWPs configured in the UL bandwidth of the serving cell via higher-layer parameters (e.g., UL-BWP or BWP-Uplink).

[0244] When the UE fails to receive the higher-layer parameter `initialDownlinkBWP`, the initial active DL BWP can be defined by the position and number of consecutive PRBs: including consecutive PRBs from the lowest to the highest index in the CORESET of the Type-0 PDCCH CSS set. Additionally, the initial active DL BWP is defined by the SCS and CP used for PDCCH reception in the CORESET of the Type-0 PDCCH CSS set. Alternatively, the initial active DL BWP is provided by the higher-layer parameter `initialDownlinkBWP`. For operations in the primary or secondary cell, the initial active UL BWP is indicated to the UE via the higher-layer parameter `initialUplinkBWP`. When configuring a supplementary UL carrier for the UE, the initial active UL BWP on the supplementary UL carrier can be indicated to the UE via the `initialUplinkBW` in the higher-layer parameter `supplementaryUplink`.

[0245] When the UE has a dedicated BWP configuration, the first active DL BWP for reception can be provided to the UE through the higher-layer parameter firstActiveDownlinkBWP-Id, and the first active UL BWP for transmission on the carrier of the primary cell can be provided to the UE through the higher-layer parameter firstActiveUplinkGBWP-Id.

[0246] For each DL BWP in the DL BWP set or each UL BWP in the UL BWP set, the following parameters can be provided to the UE.

[0247] - SCS provided based on high-level parameters (e.g., subcarrierSpacing).

[0248] - CP is provided based on high-level parameters (e.g., cyclicPrefix).

[0249] - The locationAndBandwidth parameter provides the number of public and adjacent resource blocks (RBs). The locationAndBandwidth parameter indicates the RB offset based on the Resource Indicator Value (RIV). start and length L RB Assume N size BWP For 275 and through the high-level parameter subcarrierSpacing, offsetToCarrier provides O carrier .

[0250] - Indexes in the DL BWP set or UL BWP set provided independently in UL and DL based on high-level parameters (e.g., bwp-Id).

[0251] - BWP common set parameters or BWP dedicated set parameters provided based on high-level parameters (e.g., bwp-Common or bwp-Dedicated).

[0252] For unpaired spectrum operation, when the DL BWP index and UL BWP index are the same, the DL BWP in the DL BWP set with the index provided by the higher-layer parameter (e.g., bwp-Id) is linked to the ULBWP in the UL BWP set with the same index. For unpaired spectrum operation, when the higher-layer parameter bwp-Id of the DL BWP is the same as that of the UL BWP, the UE does not anticipate receiving a configuration where the center frequency of the DL BWP is different from the center frequency of the UL BWP.

[0253] For each DL BWP in the DL BWP set of the primary cell (referred to as PCell) or the PUCCH secondary cell (referred to as PUCCH-SCell), the UE can configure a CORESET for each CSS set and USS. The UE does not expect that there are no CSSs configured on PCell or PUCCH-SCell in the active DL BWP.

[0254] When the UE is provided with controlResourceSetZero and searchSpaceZero in the higher-layer parameter PDCCH-ConfigSIB1 or PDCCH-ConfigCommon, the UE determines the CORESET of the search space set and the corresponding PDCCH monitoring timing based on controlResourceSetZero. When the active DL BWP is not the initial DL BWP, the UE only determines the PDCCH monitoring timing of the search space set if the bandwidth of the CORESET is within the active DL BWP and the active DL BWP has the same SCS configuration and CP as the initial DL BWP.

[0255] For each UL BWP in the UL BWP set of PCell or PUCCH-SCell, provide the UE with a resource set for PUCCH transmission.

[0256] The UE receives PDCCH and PDSCH in the DL BWP according to the SCS and CP length configured for the DL BWP. The UE transmits PUCCH and PUSCH in the UL BWP according to the SCS and CP length configured for the ULBWP.

[0257] When the Bandwidth Part Indicator field is configured in DCI format 1_1, the value of the Bandwidth Part Indicator field indicates the active DL BWP for DL ​​reception in the configured DL BWP set. When the Bandwidth Part Indicator field is configured in DCI format 0_1, the value of the Bandwidth Part Indicator field indicates the active UL BWP for UL transmission in the configured UL BWP set.

[0258] If the bandwidth indication field is configured in DCI format 0_1 ​​or DCI format 1_1 and indicates a UL or DL ​​BWP that is different from the active UL BWP or DL ​​BWP, the UE can operate as follows.

[0259] - For each information field in the received DCI format 0_1 ​​or DCI format 1_1,

[0260] --If the size of the information field is smaller than the size required for interpreting the DCI format 0_1 ​​or DCI format 1_1 of the UL BWP or DL ​​BWP indicated by the bandwidth section indicator, then before interpreting the information field of the DCI format 0_1 ​​or DCI format 1_1, the UE adds zeros to the front of the information field until its size is the size required for interpreting the information field of the UL BWP or DL ​​BWP.

[0261] --If the size of the information field is greater than the size required to interpret the UL BWP or DL ​​BWP indicated by the bandwidth portion indicator in DCI format 0_1 ​​or DCI format 1_1, then before interpreting the information field in DCI format 0_1 ​​or DCI format 1_1, the UE uses as many least significant bits (LSBs) as the size required by the UL BWP or DL ​​BWP indicated by the bandwidth portion indicator in DCI format 0_1 ​​or DCI format 1_1.

[0262] - The UE sets the active UL BWP or DL ​​BWP to the UL BWP or DL ​​BWP indicated by the bandwidth portion indicator in DCI format 0_1 ​​or DCI format 1_1.

[0263] If the UE does not expect to detect a change in the active DL BWP or active UL BWP, the time domain resource assignment field provides a slot offset value less than the delay required by the UE for the change in the active DL BWP or UL BWP.

[0264] When the UE detects a DCI format 1_1 indicating a change in the cell’s active DL BWP, during the time period from the end of the third symbol of the slot in which the UE receives the PDCCH including DCI format 1_1, the UE does not need to receive or transmit signals in the cell until the slot begins as indicated by the slot offset value of the time domain resource assignment field in DCI format 1_1.

[0265] If the UE detects a DCI format 0_1 ​​indicating a change in the cell's active UL BWP, then during the time period from the time period when the UE receives the third symbol of the slot containing the PDCCH of DCI format 0_1, the UE does not need to receive or transmit signals in the cell until the slot begins as indicated by the slot offset value of the time domain resource assignment field in DCI format 0_1.

[0266] In time slots outside the first time slot of the SCS set of the cell that overlap with the time period during which the UE does not need to receive or transmit signals for changes in active BWP in different cells, the UE does not expect to detect DCI format 1_1 indicating changes in active DL BWP or DCI format 0_1 ​​indicating changes in active UL BWP.

[0267] The UE expects to detect either the DCI format 0_1 ​​indicating a change in the active UL BWP or the DCI format 1_1 indicating a change in the active DL BWP only if the corresponding PDCCH is received within the first 3 symbols of the time slot.

[0268] For the serving cell, the higher-layer parameter defaultDownlinkBWP-Id can be provided to the UE to indicate the default DL BWP among the configured DL BWPs. If a default DL BWP is not provided to the UE via defaultDownlinkBWP-Id, the default DL BWP can be set as the initial active DL BWP.

[0269] When the PCell timer value is provided to the UE via the higher-layer parameter bwp-InactivityTimer and the timer is running, if the restart condition is not met during the time period corresponding to the subframe of FR1 or the time period corresponding to the half-subframe of FR2, the UE will decrement the timer at the end of the subframe of FR1 (below 6GHz) or at the end of the half-subframe of FR2 (above 6GHz).

[0270] When a UE changes the cell for an active DL BWP due to the expiration of the BWP inactivity timer, and in order to accommodate the delay in the active DL BWP change or active UL BWP change required by the UE, the UE does not need to receive or transmit signals in the cell immediately after the BWP inactivity timer expires during the time period starting from the subframe of FR1 or the half-subframe of FR2, until the time slot in which the UE can receive or transmit signals begins.

[0271] When the BWP inactivity timer for a specific cell UE expires within the time period during which the UE does not need to receive or transmit signals for the active UL / DL BWP change in that cell or different cells, the UE can immediately delay the active UL / DL BWP change triggered by the expiration of the BWP activity timer until the subframe of FR1 or half-subframe of FR2 after the UE completes the active UL / DL BWP change in that cell or different cells.

[0272] When the UE provides the first active DL BWP and the first active UL BWP to the UE on the carrier of the secondary cell via the higher-layer parameter firstActiveDownlinkBWP-Id, the UE uses the indicated DL BWP and the indicated UL BWP as the corresponding first active DL BWP and first active UL BWP on the carrier of the secondary cell.

[0273] For paired spectrum operations, when the UE changes the active UL BWP on the PCell during the time period between the detection time of DCI format 1_0 or DCI format 1_1 and the transmission time of the corresponding PUCCH including HARQ-ACK information, the UE does not expect to transmit the PUCCH including HARQ-ACK information in the PUCCH resource indicated by DCI format 1_0 or DCI format 1_1.

[0274] When the UE performs radio resource management (RRM) measurements on bandwidth other than the UE's active DL BWP, the UE does not expect to monitor the PDCCH.

[0275] 1.5. Time Slot Configuration

[0276] In various embodiments of this disclosure, the time slot format includes one or more DL symbols, one or more UL symbols, and flexible symbols. For ease of description, the corresponding configurations will be described as DL, UL, and flexible symbols, respectively, in various embodiments of this disclosure.

[0277] The following can be applied to various service areas.

[0278] When the higher-layer parameter TDD-UL-DL-ConfigurationCommon is provided to the UE, the UE can configure the time slot format for each time slot on a specific number of time slots indicated by the higher-layer parameter TDD-UL-DL-ConfigurationCommon.

[0279] The high-level parameter TDD-UL-DL-ConfigurationCommon can provide the following content.

[0280] -Reference SCS configuration based on high-level parameter referenceSubcarrierSpacing μ ref .

[0281] -High-level parameter pattern1.

[0282] The high-level parameter pattern1 can provide the following content.

[0283] - Time slot configuration periodicity P msec based on the high-level parameter dl-UL-TransmissionPeriodicity.

[0284] -Based on high-level parameters, nrofDownlinkSlots only includes the number of slots for DL ​​symbols. slots .

[0285] - The number of DL symbols d based on the high-level parameter nrofDownlinkSymbols sym .

[0286] -Based on high-level parameters, nrofUplinkSlots only includes the number of slots for UL symbols. slots .

[0287] - Number of UL symbols U based on the high-level parameter nrofUplinkSymbols sym .

[0288] For SCS configuration μ ref =3, only effective when P=0.625msec. For SCS configuration μ ref =2 or μ ref =3, only effective when P=1.25msec. For SCS configuration μ ref =1, μ ref =2 or μ ref =3, only P=2.5msec is valid.

[0289] Time slot configuration periodicity (P msec) includes SCS configuration μ ref Zhongyou Given S time slots. The first d of the S time slots. slots Each time slot includes only DL symbols, and the last u in the S time slots slots Each time slot includes only the UL symbol. (Previous d) slots d after one time slot sym The symbol is a DL symbol. u slots U before the time slot sym The symbol is the UL symbol. The remaining ones... The symbol is a flexible symbol.

[0290] The first symbol of every 20 / P cycle is the first symbol of even-numbered frames.

[0291] When the higher-layer parameter TDD-UL-DL-ConfigurationCommon provides higher-layer parameters pattern1 and pattern2, the UE configures the time slot format per time slot based on the higher-layer parameter pattern1 for a first number of time slots, and configures the time slot format per time slot based on the higher-layer parameter pattern2 for a second number of time slots.

[0292] The high-level parameter pattern2 can provide the following content.

[0293] - Time slot configuration periodicity P2 msec based on the high-level parameter dl-UL-TransmissionPeriodicity.

[0294] -Based on high-level parameters, nrofDownlinkSlots only includes the number of slots for DL ​​symbols. slots,2 .

[0295] - The number of DL symbols d based on the high-level parameter nrofDownlinkSymbols sym,2 .

[0296] -Based on high-level parameters, nrofUplinkSlots only includes the number of slots for UL symbols. slots,2 .

[0297] - Number of UL symbols U based on the high-level parameter nrofUplinkSymbols sym,2 .

[0298] The P2 value applicable according to the SCS configuration is equal to the P value applicable according to the SCS configuration.

[0299] The time slot configuration periodicity P+P2 msec includes the first S time slots (where... ) and the second S2 time slot (of which ).

[0300] The first d in S2 time slots slots,2 This includes only DL symbols, the last u in S2 time slots slots,2 This only includes the UL symbol. (Previous d) slots,2 d after one time slot sym,2 The symbol is a DL symbol. slots,2 U before the time slot sym,2 The symbol is the UL symbol. (Remaining) The symbols are flexible symbols.

[0301] The UE expects the value of P+P2 to have no remainder when divided by 20ms. In other words, the UE expects the value of P+P2 to be an integer multiple of 20ms.

[0302] The first symbol of every 20 / (P+P2) period is the first symbol of even-numbered frames.

[0303] UE expected reference SCS configuration μ ref The SCS configuration μ is less than or equal to any configuration of the DL BWP or UL BWP. The individual time slots (configurations) provided by the higher-level parameter pattern1 or pattern2 are applicable to the reference SCS configuration μ. ref The first time slot starts simultaneously with the active DL BWP or active UL BWP in the first time slot. One consecutive time slot. Refer to the SCS configuration μ ref Each DL, flexible, or UL symbol corresponds to an SCS configuration μ. A continuous DL, flexible, or UL symbol.

[0304] When the higher-layer parameter Tdd-UL-DL-ConfigurationDedicated is provided to the UE, the higher-layer parameter Tdd-UL-DL-ConfigurationDedicated only covers the flexible symbol per slot in terms of the number of slots provided by the higher-layer parameter Tdd-UL-DL-ConfigurationCommon.

[0305] The high-level parameter Tdd-UL-DL-ConfigurationDedicated can provide the following content.

[0306] - A collection of time slot configurations based on the high-level parameter slotSpecificConfigurationsToAddModList.

[0307] - Individual time slot configurations within the time slot configuration set.

[0308] - Slot index based on the high-level parameter slotIndex.

[0309] - A set of symbols based on high-level parameter symbols.

[0310] --If the higher-level parameter symbols = allDownlink, then all symbols in the time slot are DL symbols.

[0311] --If the higher-level parameter symbols = allUplink, then all symbols in the time slot are UL symbols.

[0312] --If the higher-level parameter `symbols = explicit`, then the higher-level parameter `nrofDownlinkSymbols` provides the number of the first DL symbols in the time slot, and the higher-level parameter `nrofUplinkSymbols` provides the number of the last UL symbols in the time slot. If the higher-level parameter `nrofDownlinkSymbols` is not provided, it means that there are no first DL symbols in the time slot. If the higher-level parameter `nrofUplinkSymbols` is not provided, it means that there are no last UL symbols in the time slot. The remaining symbols in the time slot are flexible symbols.

[0313] For each slot with an index provided by the higher-level parameter slotIndex, the UE applies the (slot) format provided by the corresponding symbol. The UE does not expect the higher-level parameter TDD-UL-DL-ConfigurationDedicated to indicate that the symbol for the higher-level parameter TDD-UL-DL-ConfigurationCommon is DL or UL, but rather to indicate UL or DL.

[0314] For each slot configuration provided by the higher-level parameter TDD-UL-DL-ConfigurationDedicated, the reference SCS configuration is the reference SCS configuration μ provided by the higher-level parameter TDD-UL-DL-ConfigurationCommon. ref .

[0315] The number of DL / UL / flexible symbols in each time slot of the time slot configuration periodicity is determined based on the higher-level parameters TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigurationDedicated, and this information is common to all configured BWPs.

[0316] The UE considers symbols in time slots designated as DL by the higher-layer parameters TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigurationDedicated to be usable for signal reception. Furthermore, the UE considers symbols in time slots designated as UL by the higher-layer parameters TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigurationDedicated to be usable for signal transmission.

[0317] If the UE is not configured to monitor the PDCCH of DCI format 2_0 for the symbol set of flexible time slots indicated by the higher-layer parameters TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigurationDedicated, or if the higher-layer parameters TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigurationDedicated are not provided to the UE, the UE may operate as follows.

[0318] - When the UE receives the corresponding indication via DCI format 1_0, DCI format 1_1 or DCI format 0_1, the UE can receive PDSCH or CSI-RS in the symbol set of the time slot.

[0319] - If the UE receives the corresponding indication via DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1 or DCI format 2_3, the UE may send PUSCH, PUCCH, PRACH or SRS in the symbol set of the time slot.

[0320] Assume the UE is configured by the higher layer to receive PDCCH, PDSCH, or CSI-RS in the symbol set of a time slot. When the UE does not detect any DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, or DCI format 2_3 instructing the UE to transmit PUSCH, PUCCH, PRACH, or SRS in at least one symbol in the symbol set of a time slot, the UE may receive PDCCH, PDSCH, or CSI-RS. Otherwise, that is, when the UE detects any DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, or DCI format 2_3 instructing the UE to transmit PUSCH, PUCCH, PRACH, or SRS in at least one symbol in the symbol set of a time slot, the UE will not receive PDCCH, PDSCH, or CSI-RS in the symbol set of the time slot.

[0321] When the UE is configured by the higher layer to transmit SRS, PUCCH, PUSCH or PRACH in the symbol set of the time slot and detects DCI format 1_0, DCI format 1_1 or DCI format 0_1 ​​instructing the UE to receive CSI-RS or PDSCH in a symbol subset of the symbol set, the UE operates as follows.

[0322] -Assuming that relative to the last symbol of the CORESET detected by the UE in DCI format 1_0, DCI format 1_1, or DCI format 0_1, d 2,1 =1, the PUSCH preparation time T for UEs not expected to cancel compared to the corresponding UE processing capacity. proc,2Signal transmission in a subset of symbols that appears after fewer symbols.

[0323] - The UE cancels the transmission of PUCCH, PUSCH, or PRACH in the remaining symbols of the symbol set, and also cancels the transmission of SRS in the remaining symbols of the symbol set.

[0324] For the symbol set of a time slot indicated as UL by the higher-layer parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigurationDedicated, the UE does not receive PDCCH, PDSCH or CSI-RS in the symbol set of the time slot.

[0325] For the symbol set of a time slot indicated as DL by the higher-layer parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigurationDedicated, the UE does not transmit PUSCH, PUCCH, PRACH, or SRS in the symbol set of the time slot.

[0326] For a symbol set that is indicated as a flexible time slot by the higher-layer parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigurationDedicated, the UE does not expect to receive configurations dedicated to transmissions from the UE and configurations dedicated to reception at the UE within the symbol set of the time slot.

[0327] For the symbol set of the time slot used to receive the SS / PBCH block, indicated by the higher-level parameter ssb-PositionsInBurst in the higher-level parameter SystemInformationBlockType1 or ServingCellConfigCommon, if the transmission overlaps with any symbol in the symbol set, the UE will not transmit PUSCH, PUCCH, or PRACH in the time slot, and the UE will not transmit SRS in the symbol set of the time slot. When the higher-level parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigDedicated is provided to the UE, the UE does not expect the symbol set of the time slot to be indicated as UL by the higher-level parameter.

[0328] For the symbol set of the slot corresponding to the effective PRACH timing and N before the effective PRACH timing gapWhen a signal reception overlaps with any symbol in the symbol set within a time slot, the UE will not receive PDCCH, PDSCH, or CSI-RS for the Type 1-PDCCH CSS set. The symbol set for time slots that the UE does not expect is indicated as DL by the higher-layer parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigDedicated.

[0329] For the symbol set of the slot indicated by the higher-layer parameter pdcch-ConfigSIB1 in the MIB of the CORESET of the Type0-PDCCH CSS set, the UE does not expect the symbol set to be indicated as UL by the higher-layer parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigDedicated.

[0330] When a UE is scheduled to receive PDSCH on multiple time slots via DCI format 1_1, and the higher-layer parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigDedicated indicates that for one of the multiple time slots, at least one symbol in the symbol set for which the UE is scheduled to receive PDSCH in the time slot is a UL symbol, the UE does not receive PDSCH in that time slot.

[0331] When a UE is scheduled to transmit PUSCH on multiple time slots via DCI format 0_1, and the higher-layer parameter TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigDedicated indicates that for one of the multiple time slots, the UE is scheduled to receive PUSCH in the time slot if at least one symbol in the symbol set is a DL symbol, the UE will not transmit PUSCH in that time slot.

[0332] The UE operation used to determine the slot format will be described in detail below. This UE operation can be applied to the serving cells included in the service miniset configured for the UE through the higher-layer parameters slotFormatCombToAddModList and slotFormatCombToReleaseList.

[0333] If the UE is configured with the higher-layer parameter SlotFormatIndicator, the higher-layer parameter sfi-RNTI is used to provide the UE with the SFI-RNTI and the higher-layer parameter dci-PayloadSize is used to provide the UE with the payload size of DCI format 2_0.

[0334] For one or more serving cells, the UE is also provided with a configuration of a search space set S and a corresponding CORESET P. The search space set S and the corresponding CORESET P can be used for targeting cells with L... SFI CCE aggregation level DCI format 2_0 monitoring One PDCCH candidate.

[0335] The PDCCH candidates are the CCE aggregation levels L in CORESET P used for the search space set S. SFI The former One PDCCH candidate.

[0336] For each serving cell in the serving cell set, the following can be provided to the UE:

[0337] - The ID of the serving cell based on the high-level parameter servingCellId.

[0338] - The position of the SFI-index field in DCI format 2_0 based on the high-level parameter positionInDCI.

[0339] - A set of slot format combinations based on the high-level parameter `slotFormatCombinations`, where each slot format combination in the set includes...

[0340] --One or more slot formats based on the high-level parameter slotFormats, and

[0341] --The mapping from the slot format combination provided by the high-level parameter slotFormats to the corresponding SFI-index field value in DCI format 2_0 provided by the high-level parameter slotFormatCombinationId.

[0342] - For unpaired spectrum operation, the reference SCS configuration μ is based on the higher-level parameter subcarrierSpacing. SFI When configuring a supplementary UL carrier for the serving cell, μ is configured based on the reference SCS parameter subcarrierSpacing2 used for the supplementary UL carrier. SFI,SUL .

[0343] - For paired spectrum operation, the reference SCS configuration μ for DL ​​BWP based on the higher-level parameter subcarrierSpacing. SFI,DL and the reference SCS configuration μ of UL BWP based on the high-level parameter subcarrierSpacing2 SFI,UL .

[0344] The SFI-index field value in DCI format 2_0 indicates to the UE the time slot format of each time slot in multiple time slots of each DL BWP or UL BWP starting from the time slot detected by the UE in DCI format 2_0. The number of time slots is equal to or greater than the PDCCH monitoring periodicity of DCI format 2_0. The SFI-index field includes... The number of bits, where maxSFIindexss is the maximum value provided by the corresponding higher-level parameter slotFormatCombinationId. The slot format is identified by the corresponding format index, as provided in Tables 11 to 14. In Tables 11 to 14, "D" represents a DL symbol, "U" represents a UL symbol, and "F" represents a flexible symbol.

[0345] [Table 11]

[0346]

[0347] [Table 12]

[0348] 15 F F F F F F U U U U U U U U 16 D F F F F F F F F F F F F F 17 D D F F F F F F F F F F F F 18 D D D F F F F F F F F F F F 19 D F F F F F F F F F F F F U 20 D D F F F F F F F F F F F U 21 D D D F F F F F F F F F F U 22 D F F F F F F F F F F F U U 23 D D F F F F F F F F F F U U 24 D D D F F F F F F F F F U U 25 D F F F F F F F F F F U U U 26 D D F F F F F F F F F U U U 27 D D D F F F F F F F F U U U 28 D D D D D D D D D D D D F U 29 D D D D D D D D D D D F F U 30 D D D D D D D D D D F F F U 31 D D D D D D D D D D D F U U 32 D D D D D D D D D D F F U U

[0349] [Table 13]

[0350] 33 D D D D D D D D D F F F U U 34 D F U U U U U U U U U U U U 35 D D F U U U U U U U U U U U 36 D D D F U U U U U U U U U U 37 D F F U U U U U U U U U U U 38 D D F F U U U U U U U U U U 39 D D D F F U U U U U U U U U 40 D F F F U U U U U U U U U U 41 D D F F F U U U U U U U U U 42 D D D F F F U U U U U U U U 43 D D D D D D D D D F F F F U 44 D D D D D D F F F F F F U U 45 D D D D D D F F U U U U U U

[0351] [Table 14]

[0352]

[0353]

[0354] If the PDCCH monitoring period of DCI format 2_0 provided to the UE by the high-level parameter monitoringSlotPeriodicityAndOffset for the search space set S is less than the duration of the slot format combination obtained by the UE through the corresponding SFI-index field value during the PDCCH monitoring time of DCI format 2_0, and the UE detects that the slot format of the indicated slot exceeds one DCI format 2_0, then the UE expects the same (slot) format for each indicated slot in more than one DCI format 2_0.

[0355] The UE is not intended to be configured to monitor the PDCCH of DCI format 2_0 on a second serving cell using an SCS larger than that of the serving cell.

[0356] For unpaired spectrum operations by the UE on the serving cell, the reference SCS configuration μ of each slot format in the slot format combination indicated by the SFI-index field value in DCI format 2_0 is provided to the UE through the higher-layer parameter subcarrierSpacing. SFI The UE is expected to have a reference SCS configuration μ SFI Furthermore, for the SCS configuration μ of the active DL BWP or active UL BWP, μ ≥ μ SFI The slot format indicated by the SFI-index field value in DCI format 2_0 applies to the first slot and the reference SCS configuration μ. SFI The first time slot simultaneously starts the activity DL BWP or activity UL BWP One consecutive time slot. Refer to the SCS configuration μ SFI Each DL or flexible or UL symbol corresponds to an SCS configuration μ. A continuous DL or flexible or UL symbol.

[0357] For UE pairing spectrum operations on the serving cell, the SFI-index field in DCI format 2_0 includes the slot format combination of the reference DL BWP and the slot format combination of the reference UL BWP for the serving cell. The reference SCS configuration for each slot format in the slot format combination indicated by this value is provided to the UE. For the reference SCS configuration μ... SFI With the SCS configuration μ of the active DL BWP or active UL BWP, the UE expects μ ≥ μ SFI The higher-layer parameter `subcarrierSpacing` provides the UE with a reference SCS configuration for the slot format combination indicated by the SFI-index field value in the DCI format 2_0 of the reference DL BWP for the serving cell. The higher-layer parameter `subcarrierSpacing2` provides the UE with a reference SCS configuration for the slot format combination indicated by the SFI-index field value in the DCI format 2_0 of the reference UL BWP for the serving cell. SFI,UL If μ SFI,DL ≥μ SFI,UL Then, for each [item] provided by the value of the higher-level parameter `slotFormats`... The value of the high-level parameter `slotFormats` is determined based on the value of the high-level parameter `slotFormatCombinationId` in the high-level parameter `slotFormatCombination`, and the value of the high-level parameter `slotFormatCombinationId` is set based on the value of the `SFI-index` field in DCI format 2_0. The first slot format combination... The first value applies to the reference DLBWP, and the next value applies to the reference UL BWP. If μ SFI,DL <μ SFI,UL Then for each slotFormat provided by the high-level parameter, The first value of the slot format combination is applicable to the reference DL BWP, and the following values... These values ​​are applicable to reference UL BWP.

[0358] For the symbol set of a time slot, the UE does not expect to detect DCI format 2_0 with an SFI-index field value that indicates the symbol set in the time slot as UL and DCI format 1_0, DCI format 1_1 or DCI format 0_1 ​​that indicates the UE to receive PDSCH or CSI-RS in the symbol set of the time slot.

[0359] For the symbol set of a time slot, the UE does not expect to detect DCI format 2_0 with an SFI-index field value that indicates the symbol set in the time slot as DL and detect DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, DCI format 2_3 or RAR UL license that instructs the UE to send PUSCH, PUCCH, PRACH or SRS in the symbol set of the time slot.

[0360] For the symbol set of time slots indicated as DL / UL by the higher-level parameters TDD-UL-DL-ConfigurationCommon or TDDUL-DL-ConfigDedicated, the UE does not expect to detect DCI format 2_0 which indicates the symbol set of time slots as UL / DL or a flexible SFI-index field value, respectively.

[0361] For the set of symbols for a time slot indicated to the UE by the higher-level parameter SystemInformationBlockType1 or the higher-level parameter ssb-PositionsInBurst in ServingCellConfigCommon in order to receive the SS / PBCH block, the UE does not expect to detect DCI format 2_0 with the SFI-index field value indicating the set of symbols for the time slot as UL.

[0362] For the symbol set of a time slot indicated to the UE by the higher-level parameter prach-ConfigurationInde in the higher-level parameter RACH-ConfigCommon for PRACH transmission, the UE does not expect to detect DCI format 2_0 with the SFI-index field value indicating the symbol set of the time slot as DL.

[0363] For the set of symbols for a time slot indicated to the UE via the higher-level parameter pdcch-ConfigSIB1 in the MIB of the CORESET of the Type0-PDCCH CSS set, the UE does not expect to detect DCI format 2_0 with the SFI-index field value indicating the set of symbols for the time slot as UL.

[0364] For the symbol set of flexible time slots indicated to the UE by the higher-layer parameters TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated, or when the higher-layer parameters TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated are not provided to the UE, if the UE detects DCI format 2_0 with a time slot format value other than 255,

[0365] - If one or more symbols in the symbol set are symbols configured for PDCCH monitoring in the CORESET for the UE, the UE will receive PDCCH in the CORESET only if the SFI-index field value in DCI format 2_0 indicates that one or more symbols are DL symbols.

[0366] - If the SFI-index field value in DCI format 2_0 indicates that the symbol set of the time slot is flexible and the UE detects DCI format 1_0, DCI format 1_1 or DCI format 0_1 ​​indicating that the UE receives PDSCH or CSI-RS in the symbol set of the time slot, then the UE receives PDSCH or CSI-RS in the symbol set of the time slot.

[0367] - If the SFI-index field value in DCI format 2_0 indicates that the symbol set of the time slot is flexible and the UE detects a DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, DCI format 2_3 or RAR UL license instructing the UE to transmit PUSCH, PUCCH, PRACH or SRS in the symbol set of the time slot, then the UE transmits PUSCH, PUCCH, PRACH or SRS in the symbol set of the time slot.

[0368] --If the SFI-index field value in DCI format 2_0 indicates that the symbol set of the time slot is flexible, and the UE does not detect DCI format 1_0, DCI format 1_1, or DCI format 0_1 ​​indicating that the UE receives PDSCH or CSI-RS, or the UE does not detect DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, DCI format 2_3, or RAR UL permission indicating that the UE transmits PUSCH, PUCCH, PRACH, or SRS in the symbol set of the time slot, then the UE does not transmit or receive signals in the symbol set of the time slot.

[0369] - If the UE is configured by the higher layer to receive PDSCH or CSI-RS in the symbol set of the time slot, the UE will only receive PDSCH or CSI-RS in the symbol set of the time slot if the SFI-index field value in DCI format 2_0 indicates the symbol set of the time slot as DL.

[0370] - If the UE is configured by the higher layer to transmit PUCCH, PUSCH, or PRACH in the symbol set of the time slot, the UE will only transmit PUCCH, PUSCH, or PRACH in the time slot if the SFI-index field value in DCI format 2_0 indicates the symbol set of the time slot as UL.

[0371] - If the UE is configured by the higher layer to transmit SRS in the symbol set of the time slot, the UE will only transmit SRS in a subset of the symbol set of the time slot indicated by the SFI-index field value in DCI format 2_0 as a UL symbol.

[0372] - The UE does not expect to detect the SFI-index field value in DCI format 2_0 of the time slot indicating the symbol set of the time slot, and also detects the DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, DCI format 2_3 or RAR UL license indicating that the UE transmits SRS, PUSCH, PUCCH or PRACH in one or more symbols of the symbol set of the time slot.

[0373] - If the symbol set of a time slot includes symbols corresponding to any duplicates transmitted via PUSCH enabled by a UL Type 2 licensed PDCCH, the UE does not expect to detect the symbol set of the time slot as indicated by the SFI-index field value in DL or Flexible DCI Format 2_0.

[0374] - The UE does not expect to detect that the symbol set of the time slot is indicated as the SFI-index field value in the DCI format 2_0 of the UL and also detects that the UE receives PDSCH or CSI-RS in one or more symbols of the symbol set of the time slot in DCI format 1_0 or DCI format 1_1 or DCI format 0_1.

[0375] If the UE is configured by the higher layer to receive CSI-RS or PDSCH in the symbol set of the time slot and detects that a subset of symbols in the symbol set is indicated as UL or flexible DCI format 2_0, or that the UE is instructed to transmit PUSCH, PUCCH, SRS or PRACH in at least one symbol in the symbol set in DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1 or DCI format 2_3, then the UE cancels the CSI-RS reception or PDSCH reception in that time slot.

[0376] If the UE is configured by the higher layer to transmit SRS, PUCCH, PUSCH, or PRACH in the symbol set of the time slot and detects DCI format 2_0 which indicates a subset of symbols in the symbol set as DL or a flexible time slot format value, or DCI format 1_0, DCI format 1_1, or DCI format 0_1 ​​which instructs the UE to receive CSI-RS or PDSCH in at least one symbol in the symbol set, then

[0377] - The UE does not anticipate canceling the last symbol of the CORESET relative to the UE's detection of DCI format 2_0, DCI format 1_0, DCI format 1_1, or DCI format 0_1 ​​in the PUSCH preparation time T corresponding to the PUSCH processing capacity. proc,2 Signal transmission in a subset of symbols that appears after fewer symbols.

[0378] - The UE cancels PUCCH, PUSCH, or PRACH transmissions in the remaining symbols of the symbol set and cancels SRS transmissions in the remaining symbols of the symbol set.

[0379] If the UE does not detect DCI format 2_0 indicating the symbol set of the time slot as flexible or UL, or DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, or DCI format 2_3 indicating the UE to send SRS, PUSCH, PUCCH, or PRACH in the symbol set, the UE assumes that the flexible symbol in the CORESET configured for PDCCH monitoring for the UE is a DL symbol.

[0380] For the symbol set of flexible time slots indicated by the higher-layer parameters TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated, or when the higher-layer parameters TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated are not provided to the UE, if the UE does not detect DCI format 2_0 of the time slot format provided,

[0381] - If the UE receives the corresponding indication via DCI format 1_0, DCI format 1_1 or DCI format 0_1, then the UE receives PDSCH or CSI-RS in the symbol set of the time slot.

[0382] - If the UE receives the corresponding indication via DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1 or DCI format 2_3, then the UE transmits PUSCH, PUCCH, PRACH or SRS in the symbol set of the time slot.

[0383] - The UE can receive PDCCH.

[0384] - If the UE is configured by the higher layer to receive PDSCH or CSI-RS in the symbol set of the time slot, then the UE does not receive PDSCH or CSI-RS in the symbol set of the time slot.

[0385] -If the UE is configured by the higher layer to transmit SRS, PUCCH, PUSCH, or PRACH in the symbol set of the time slot,

[0386] --The UE does not transmit PUCCH, PUSCH or PRACH in the time slot, and does not transmit SRS in the symbol set of the time slot starting from the last symbol of the CORESET of the PDCCH configured for monitoring DCI format 2_0 after the number of symbols equal to the PUSCH preparation time N2 of the corresponding PUSCH timing capability (if any).

[0387] - The UE does not expect to cancel the transmission of SRS or PUCCH, PUSCH or PRACH in the symbol set of the time slot, which is the last symbol of the CORESET of the PDCCH configured for monitoring DCI format 2_0, and which is after the symbol with a number of symbols equal to the PUSCH preparation time N2 of the corresponding PUSCH timing capability.

[0388] 1.6. Dynamic timeslot format indication information (e.g., DCI format 2_0)

[0389] Basically, the time slot format indicates the purpose of each symbol within the time slot. The time slot format indicates each symbol as DL(D), UL(U), or Flexible(F). Time slot format related information can be sent in one or more of the following signals:

[0390] - Static or semi-static slot format indication (SFI) via higher-layer signaling (e.g., TDD-UL-DL-ConfigurationCommon and / or TDD-UL-DL-ConfigDedicated)

[0391] - Measurement-related scheduling signals (e.g., measurement-related signals configured via UE-specific RRC signaling).

[0392] - Dynamic SFI (e.g., signals transmitted in DCI format 2_0)

[0393] - UE-specific data transmission scheduling signals (e.g., UE-specific DCI)

[0394] Static or semi-static SFIs can be indicated by cell-specific RRC signaling (e.g., TDD-UL-DL-ConfigurationCommon) or UE-specific RRC signaling (e.g., TDD-UL-DL-ConfigDedicated). Measurement-related signals can be indicated by UE-specific RRC signaling, and the corresponding signals can indicate periodic / semi-persistent CSI-RS, periodic CSI reports, periodic / semi-persistent SRS, etc. UE-specific data transmission-related signals may include UE-specific DCIs that trigger PUCCH along with the A / N of PDSCH, PUSCH, or PDSCH, and DCIs that trigger aperiodic measurement-related signals (aperiodic CSI-RS, aperiodic SRS, etc.).

[0395] Figure 13 This is a diagram illustrating exemplary time slot formats according to various embodiments of the present disclosure. More specifically, Figure 13 Exemplary time slot formats for various numbers of switching points according to various embodiments of this disclosure are shown.

[0396] Time slot formats include those with zero, one, or two switching points. Figure C5 illustrates various exemplary time slot formats. Specifically, Figure 13 (a) shows an exemplary time slot format with zero switching points. Figure 13 (b) shows an exemplary time slot format for a switching point. Figure 13 (c) shows an exemplary time slot format for two switching points.

[0397] A zero-switching-point time slot format includes 14 DL symbols, 14 flexible symbols, or 14 UL symbols. A one-switching-point time slot format is configured to begin with zero or more DL symbols and end with zero or more UL symbols, with one or more flexible symbols and DL / UL symbols in between. A two-switching-point time slot format is configured to include the first seven symbols, beginning with zero or more DL symbols and ending with one or more UL symbols in the seventh symbol, and a second seventh symbol, beginning with one or more DL symbols and ending with zero or more UL symbols. Each set of the first seven symbols and the second seventh symbol may include zero or more flexible symbols.

[0398] Up to 256 such time slot formats can be defined, and their configuration is defined in technical specifications such as TS 38.211. The UE is configured with a UE-specific SFI table based on up to 256 time slot formats via higher-layer signaling, and receives specific index values ​​of the UE-specific SFI table in DCI format 2_0 (or GC-PDCCH).

[0399] The UE determines the time slot format based on the subsequent priority order of the signals carrying the aforementioned time slot format-related information. More specifically, when the UE receives time slot format-related information among multiple signals, the UE only considers the indication information of the signals with subsequent priorities to identify the purpose of the flexible symbols indicated by the high-priority signals.

[0400] Time slot format information via cell-specific higher-layer signaling (e.g., TDD-UL-DL-ConfigurationCommon) > Time slot format information via UE-specific higher-layer signaling (e.g., TDD-UL-DL-ConfigDedicated) > Time slot format information via GC-PDCCH (e.g., DCI format 2_0) > UE-specific data transmission scheduling information > Measurement-related scheduling information

[0401] Therefore, when a specific symbol in a time slot is indicated to the UE as DL / UL via cell-specific RRC signaling or UE-specific RRC signaling, the UE does not expect DCI format 2_0 (or group-specific PDCCH including DCI format 2_0) to indicate the specific symbol as UL / DL or flexible. When a specific symbol in a time slot is indicated as flexible via DCI format 2_0 (or group-specific PDCCH including DCI format 2_0), the UE only transmits and receives related signals in the specific symbol when it receives scheduling information separately (e.g., UE-specific scheduling DCI). When the UE does not receive scheduling information separately, the UE does not transmit / receive signals in the specific symbol.

[0402] 1.7. DL preemption related information (e.g., DCI format 2_1)

[0403] Wireless communication systems employing various embodiments of this disclosure support eMBB transmission with relatively large traffic sizes and URLLC transmission with relatively small traffic sizes.

[0404] Figure 14 This is a diagram illustrating exemplary resource sharing between eMBB and URLLC transports according to various embodiments of the present disclosure.

[0405] When eMBB and URLLC transmissions have the same transmission duration, they can share non-overlapping time / frequency resources based on scheduling, such as... Figure 14 As shown in (a). Alternatively, in DL transmission, URLLC transmission may occur in the resources used for ongoing eMBB transmission to meet the different latency and / or reliability requirements of eMBB transmission and URLLC transmission.

[0406] Therefore, DCI format 2_1 transmits information to the UE (for URLLC transmission) regarding resources that (partially) overlap with resources scheduled for DL ​​eMBB transmission. The UE assumes that there is no signal transmission in the RBs and symbols indicated by DCI format 2_1. The UE can exclude the indicated coded bits from the soft buffer and (re)decode the PDSCH with reference to the DL preemption indication.

[0407] Figure 15 This is a diagram illustrating exemplary DL preemption instructions according to various embodiments of the present disclosure. More specifically, Figure 15 This is a diagram illustrating the configuration of URLLC transport resources that overlap with pre-configured DL eMBB resources by means of DL preemption instructions according to various embodiments of the present disclosure.

[0408] Figure 16 This is a diagram illustrating exemplary preemption operations according to various embodiments of the present disclosure. More specifically, Figure 16 Exemplary operations of preempting some resources via PI in DCI format 2_1 according to various embodiments of this disclosure are shown.

[0409] The BS sends the DL preemption indication to the UE in DCI format 2_1. DCI format 2_1 indicates the preempted resource in a reference time / frequency resource area. The monitoring periodicity of the DCI format 2_1, including the preemption indication (PI), can be equal to the periodicity of the reference time area. The reference frequency area can be the same as the active DL BWP.

[0410] Figure 17 This is a diagram illustrating an exemplary method of representing preemption instruction information as a bitmap according to various embodiments of the present disclosure.

[0411] The time / frequency granularity of the preemption indication information is determined by the timeFrequencySet in the higher-level signaling DownlinkPreemption.

[0412] When the value of timeFrequencySet is 0 (Set0), the DL resources used for preemption indication are divided into 14 time-domain portions or groups (e.g., each group includes consecutive symbols), and each bit indicates whether there is a transmission to the UE in the corresponding time-domain portion or group (e.g., when the bit value is 1, this indicates that there is a signal transmission to the UE, and when the bit value is 0, this indicates that there is no signal transmission to the UE). Figure 17 (as shown in (a)).

[0413] When the value of timeFrequencySet is 1 (Set1), the DL resources used for preemption indication are divided into 7 time-domain portions or pairs (e.g., each group includes consecutive symbols). The first bit in each pair indicates whether there is a signal transmission to the UE in some frequency-domain portions of the corresponding time-domain portion or pair, and the second bit in the pair indicates whether there is a signal transmission to the UE in the remaining frequency-domain portions of the corresponding time-domain portion or pair (e.g., when the bit value is 1, this indicates that there is a signal transmission in the corresponding time / frequency region of the UE, and when the bit value is 0, this indicates that there is no signal transmission in the time / frequency region of the UE, such as...). Figure 17 (as shown in (b)).

[0414] 1.8. Multiplexing of Short PUCCH and Long PUCCH

[0415] Figure 18 Exemplary multiplexing of UL signals with short PUCCH and long PUCCH is shown in various embodiments of this disclosure.

[0416] PUCCH (e.g., PUCCH format 0 / 2) and PUSCH can be multiplexed using TDM or FDM. Short PUCCH and long PUCCH from different UEs can be multiplexed using TDM or FDM. Short PUCCH from a single UE can be multiplexed using TDM within a single time slot. Short PUCCH and long PUCCH from a single UE can be multiplexed using TDM or FDM within a single time slot.

[0417] 2. Unlicensed band / shared spectrum system

[0418] Figure 19 This is a diagram illustrating an exemplary wireless communication system supporting unlicensed frequency bands to which various embodiments of this disclosure are applicable.

[0419] In the following description, a cell operating in a licensed frequency band (L-band) is defined as an L-cell, and the carrier of an L-cell is defined as (DL / UL)LCC. Furthermore, a cell operating in an unlicensed frequency band (U-band) is defined as a U-cell, and the carrier of a U-cell is defined as (DL / UL)UCC. The carrier / carrier frequency of a cell may refer to the cell's operating frequency (e.g., center frequency). The cell / carrier (e.g., CC) is commonly referred to as the cell.

[0420] When the UE and BS send and receive signals to each other in the LCC and UCC of carrier aggregation, such as Figure 19 As shown in (a), the LCC can be configured as the primary CC (PCC), and the UCC can be configured as the secondary CC (SCC).

[0421] like Figure 19 As shown in (b), the UE and BS can transmit and receive signals from each other in one UCC or in multiple carrier aggregation LCCs and UCCs. That is, the UE and BS can transmit and receive signals only in a UCC, without an LCC. (Unless otherwise mentioned,) signal transmission and reception operations in the unlicensed band as described in the various embodiments of this disclosure can be performed based on all the deployment scenarios described above.

[0422] 2.1. Radio frame structure for unlicensed frequency bands

[0423] For operations in unlicensed frequency bands, LTE frame structure type 3 can be used (see [link]). Figure 3 ) or NR frame structure (see Figure 7 In a frame structure used for unlicensed frequency bands, the configuration of OFDM symbols occupied by UL / DL signal transmissions can be configured by the BS. In this document, the term OFDM symbol may be replaced by SC-FDM(A) symbol.

[0424] For DL ​​signal transmission in unlicensed frequency bands, the BS can indicate the configuration of OFDM symbols used in subframe #n to the UE via signaling. In the following description, the term subframe may be replaced by time slot or time unit (TU).

[0425] Specifically, in a wireless communication system that supports unlicensed frequency bands, the UE may assume (or identify) the configuration of the OFDM symbol occupied by a specific field (e.g., a subframe configuration field for LAA, etc.) in the DCI received from the BS in subframe #n-1 or subframe #n.

[0426] Table 15 illustrates an exemplary method in a wireless communication system for representing the configuration of occupied OFDM symbols for transmitting DL physical channels and / or physical signals in the current frame and / or the next subframe using a subframe configuration field for LAA.

[0427] [Table 15]

[0428]

[0429]

[0430] For UL signal transmission in unlicensed frequency bands, the BS can send information about the duration of UL transmission to the UE via signaling.

[0431] Specifically, in LTE systems that support unlicensed frequency bands, the UE can obtain the "UL duration" and "UL offset" information of subframe #n through the "UL duration and offset" field in the detected DCI.

[0432] Table 16 illustrates an exemplary method for representing UL offset and UL duration configurations in a wireless communication system using the UL duration and offset fields.

[0433] [Table 16]

[0434]

[0435]

[0436] For example, when the UL duration and offset fields configure (or indicate) the UL offset l and UL duration d of subframe #n, the UE does not need to receive the DL physical channel and / or physical signal in subframe #n+l+i (i = 0, 1, ..., d-1).

[0437] 2.2 Overview of the Channel Access Procedure (CAP)

[0438] Unless otherwise stated, the following definitions apply to the following terms used in this disclosure.

[0439] -A channel is a carrier or a portion of a carrier consisting of a set of adjacent RBs that perform CAP in a shared spectrum.

[0440] The Channel Access Procedure (CAP) can be a sense-based process that assesses the availability of a channel to perform transmissions. The basic unit of sensing is a duration of T. sl = 9µs sensing time slot. If the eNB / gNB or UE senses the channel during the duration of the sensing time slot, and determines that the detected power is less than the energy detection threshold X within at least 4µs of the sensing time slot duration. Thresh If the sensing time slot duration is T, then the sensing time slot duration can be considered idle. Otherwise, the sensing time slot duration T sl It can be considered busy.

[0441] - Channel occupancy refers to the transmission on the channel by the eNB / gNB / UE after the corresponding CAP in this sub-clause is executed.

[0442] Channel Occupancy Time (COT) refers to the total time that the eNB / gNB / UE and any eNB / gNB / UE sharing the channel occupancy perform transmissions on the channel after the eNB / gNB / UE executes the corresponding CAP described in this sub-clause. To determine COT, if the transmission gap is less than or equal to 25 µs, the gap duration can be counted in the COT. COT can be shared for transmissions between the eNB / gNB and the corresponding UE.

[0443] - A DL transmission burst is defined as a set of transmissions from an eNB / gNB without any gaps greater than 16µs. Transmissions from an eNB / gNB separated by gaps exceeding 16µs are considered separate DL transmission bursts. The eNB / gNB may send transmissions after gaps within a DL transmission burst without sensing the availability of the corresponding channel.

[0444] - A UL transmission burst is defined as a set of transmissions from the UE without any gaps greater than 16µs. Transmissions from the UE separated by gaps exceeding 16µs are considered separate UL transmission bursts. The UE can send transmissions after gaps within a UL transmission burst without sensing the availability of the corresponding channel.

[0445] A discovery burst is a DL transmission burst that includes a set of signals and / or channels confined within a window and associated with a duty cycle. A discovery burst can be any of the following:

[0446] --Transmissions initiated by the eNB include the primary synchronization signal (PSS), secondary synchronization signal (SSS), and cell-specific reference signal (CRS), and may include non-zero power CSI-RS.

[0447] --Transmissions initiated by the gNB include at least an SS / PBCH block, and may also include a CORESET for scheduling a PDSCH with SIB1 and a PDCCH carrying SIB1 and / or a non-zero power CS-RS. The SS / PBCH block may include a PSS, SSS, and PBCH with an associated demodulation reference signal (DM-RS).

[0448] 2.3. Downlink Channel Access Procedure (DL CAP)

[0449] For DL ​​signal transmission in the unlicensed band, the BS can perform DL CAP for the unlicensed band as follows. Assuming the BS is essentially configured with a PCell as the licensed band and one or more SCells as the unlicensed band, the following description of DL CAP applicable to various embodiments of this disclosure is given, where the unlicensed band is referred to as a Licensed Assisted Access (LAA) SCell. However, DL CAP can also be applied in the same manner when only the unlicensed band is configured for the BS.

[0450] 2.3.1. Type 1 DL Channel Access Procedure

[0451] This sub-clause describes the CAP to be performed by the BS, with the duration spanned by the sensing slots that are sensed as idle prior to the DL transmission being randomized. This sub-clause applies to the following transmissions:

[0452] - Transmissions initiated by the BS, including PDSCH / PDCCH / EPDCCH, or

[0453] -Transmissions initiated by the BS include either a unicast PDSCH with user plane data or a unicast PDSCH with user plane data and a unicast PDCCH that schedules user plane data, or

[0454] - Transmissions initiated by the BS only have discovery bursts or discovery bursts multiplexed with non-unicast information, wherein the duration of the transmission is greater than 1ms or the transmission causes the duty cycle of the discovery burst to exceed 1 / 20.

[0455] BS can delay the duration T d After the channel is sensed to be idle during the sensing time slot duration and after the counter N reaches zero in step 4 described below, transmission is performed. The counter N is adjusted by sensing the channel during the additional sensing time slot duration according to the following procedure:

[0456] 1) Let N = N init , where N init It is in 0 and CW p A random number evenly distributed between them, and proceed to step 4;

[0457] 2) If N>0 and BS chooses to decrease the counter, then let N = N-1;

[0458] 3) Sensing the channel during the duration of the additional sensing time slot, and if the duration of the additional sensing time slot is idle, proceed to step 4; otherwise, proceed to step 5.

[0459] 4) If N = 0, stop; otherwise, go to step 2;

[0460] 5) Sensing the channel until the additional delay duration T dThe system detects a busy sensing slot or an additional delay duration T. d All sensing slots were detected as idle; and

[0461] 6) If there is an additional delay duration T d If the channel is sensed as idle during all sensing time slot durations, proceed to step 4; otherwise, proceed to step 5.

[0462] Figure 20 This is a flowchart illustrating various embodiments of the present disclosure to which a DL CAP is applicable for transmission in an unlicensed frequency band.

[0463] The above-mentioned type 1DL CAP can be summarized as follows.

[0464] For DL ​​transport, the transport node (e.g., BS) can initiate CAP (2010).

[0465] BS can randomly select a backoff counter N within the contention window (CW) according to step 1. N is set to the initial value N0. init (2020). N init It is in 0 and CW p A random value selected from among them.

[0466] Subsequently, when the backoff counter value N is 0 according to step 4 (2030; Yes), the BS terminates CAP (2032). Then, the BS can perform Tx burst transmission (2034). Conversely, when the backoff counter value N is not 0 (2030; No), the BS decrements the backoff counter value by 1 according to step 2 (2040).

[0467] The BS then checks if the channel is idle (2050). If the channel is idle (2050; yes), the BS determines if the backoff counter value is 0 (2030).

[0468] Conversely, when the channel is not idle, i.e., when the channel is busy in operation 2050 (2050; no), the BS determines a delay duration T that is longer than the duration of the sensing time slot (e.g., 9 µs). d The channel is idle for 25µs or longer (2060). If the channel is idle during the delay period (2070; yes), the BS can recover CAP.

[0469] For example, when the backoff counter value N initWhen the channel is determined to be idle after the backoff counter value decreases to 5, the BS senses the channel and determines whether the channel is idle during the delay duration. If the channel is idle during the delay duration, the BS can restore CAP from the backoff counter value 5 (or from the backoff counter value 4 obtained by subtracting 1 from the backoff counter value 5) instead of setting the backoff counter value N. init .

[0470] On the other hand, when the channel is busy during the delayed duration (2070; no), the BS determines again whether the channel is idle during the new delayed duration by re-executing step 2060.

[0471] If the BS has not performed a transmission after step 4 of the above process, the BS may perform a transmission on the channel if the following conditions are met:

[0472] If the BS is ready to transmit and the channel is at least for the sensing time slot duration T sl The middle is sensed as idle, and if the delay duration T immediately preceding this transmission... d All sensing time slot duration channels have been sensed as idle.

[0473] Conversely, if the BS senses the channel for the first time after it is ready to transmit, during the sensing time slot duration T... sl The middle channel is not sensed as idle, or if the delay duration T immediately preceding this expected transmission... d If the channel is not sensed as idle during any sensing time slot duration, then the BS will delay the duration T. sl After the channel is detected to be idle during the duration of the sensing time slot, proceed to step 1.

[0474] Delay duration T d Including immediately following m p The duration T of each continuous sensing time slot f (=16us). Duration T of each sensing time slot sl It is 9us and the duration is T f Including duration T f The duration T of the idle sensing slot at the beginning sl .

[0475] CW min,p ≤CW p ≤CW max,p It's a competitive window. CW p The regulation is described in sub-clause 2.2.3.

[0476] Select CW before step 1 of the above process. min,p and CW max,p.

[0477] m is determined based on the channel access priority category associated with BS transmission. p CW min,p and CW max,p (Refer to Table 17).

[0478] As described later, X is subject to regulation according to sub-clause 2.3.4. Thresh .

[0479] [Table 17]

[0480]

[0481] If N>0 during the above process, then when the BS sends a discovery burst, the BS does not decrement the counter N during the duration of the sensing time slot that overlaps with the discovery burst.

[0482] The BS may use any channel access priority class to perform the above process to perform transmissions that include the discovery of bursts of transmissions that meet the conditions described in this sub-clause.

[0483] The BS should use the channel access priority class applicable to unicast user plane data multiplexed in the PDSCH to perform the above process to perform transmissions including unicast PDSCH with user plane data.

[0484] For p=3 and p=4 in Table 13, if it can be guaranteed long-term (e.g., according to regulations) that there are no other technologies sharing the channel, T mcot,p Set to 10ms. Otherwise, T mcot,p It is set to 8ms.

[0485] 2.3.2 Type 2DL Channel Access Procedure

[0486] This sub-term describes the CAP to be performed by the BS, which is deterministic for the duration spanned by the sensing slots that are sensed as idle prior to DL transmission.

[0487] Type 2A DL CAP can be applied to the following transmissions performed by the BS.

[0488] - Transmissions initiated by the BS, including burst detection but excluding PDSCH, or

[0489] - Transmissions initiated by the BS only have discovery bursts or discovery bursts multiplexed with non-unicast information. In this paper, the transmission duration is at most 1 ms, or the transmission causes the discovery burst duty cycle to exceed 1 / 20. Alternatively,

[0490] - The BS transmits after the UE's transmission following a 25µs gap in the shared channel occupancy.

[0491] Type 2B or Type 2C DL CAP is applicable to transmissions performed by the BS after the UE's transmission, following a gap of 16µs or at most 16µs, respectively, during shared channel occupancy.

[0492] 2.3.2.1 Type 2A DL Channel Access Procedure

[0493] BS can sense at least during the sensing duration T short dl = DL transmission will be performed immediately after the channel becomes idle for 25µs. T short dl Including the duration T after the duration of a sensing time slot f (=16us). T f Including T f The initial sensing time slot. If T short dl If both sensing time slots are sensed as idle, then in T short dl The internal channel is considered idle.

[0494] 2.3.2.2 Type 2B DL ​​Channel Access Procedure

[0495] BS can sense in T f DL transmission is performed immediately after the channel becomes idle for a duration of 16µs. f Including those appearing in T f The sensing time slot is within the last 9 µs. The channel is considered to be in duration T. f If the channel is sensed as idle for at least 5µs in total, and at least 4µs of sensing occurs in the sensing time slot, then in T f The internal channel is considered idle.

[0496] 2.3.2.3. Type 2C DL Channel Access Procedure

[0497] When the BS follows the procedure in this sub-clause for DL ​​transmission, the BS does not sense the channel prior to the DL transmission. The duration of the corresponding DL transmission is at most 584 µs.

[0498] 2.3.3. Competition Window Adjustment Process

[0499] If the BS performs transmissions on the channel that include a PDSCH associated with the channel access priority class p, the BS maintains the contention window value CW. p And adjust the competition window value CW before step 1 of the process described in sub-clause 2.3.1. p To transmit.

[0500] 2.3.3.1. Contention Window Adjustment Process for eNB Transmission

[0501] If the eNB performs a transmission on the channel that includes a PDSCH associated with the channel access priority class p, the eNB maintains the contention window value CW. p And before step 1 of the process described in sub-clause 2.3.1 (i.e., before performing CAP), adjust CW using the following steps. p To transmit.

[0502] 1> For each priority class p∈{1,2,3,4}, set CW p =CW min,p .

[0503] 2> If at least Z = 80% of the HARQ-ACK values ​​corresponding to the PDSCH transmission in reference subframe k are determined to be NACK, then the CW for each priority class p ∈ {1,2,3,4} will be... p Increase to the second-highest allowable value and remain in step 2; otherwise, proceed to step 1.

[0504] In other words, if the probability that the HARQ-ACK value corresponding to the PDSCH transmission in reference subframe k is determined to be NACK is at least 80%, then the eNB will increase the CW value set for each priority category to the second highest permissible value. Alternatively, the eNB will maintain the CW value set for each priority category at its initial value.

[0505] The reference subframe k is the starting subframe of the most recent transmission made by the eNB on a channel on which at least some HARQ-ACK feedback is expected to be available.

[0506] eNB adjusts the value of each priority category p∈{1,2,3,4} only based on a given reference subframe k. p once.

[0507] The probability Z of the HARQ-ACK value corresponding to the PDSCH transmission in reference subframe k being determined as NACK can be determined as follows.

[0508] - If the eNB transmission for which HARQ-ACK feedback is available begins in the second time slot of subframe k, then in addition to the HARQ-ACK value corresponding to the PDSCH transmission in subframe k+1, the HARQ-ACK value corresponding to the PDSCH transmission in subframe k+1 is also used.

[0509] -If the HARQ-ACK value corresponds to a PDSCH transmission on the LAA SCell assigned by the (E)PDCCH sent on the same LAA SCell,

[0510] --If the eNB does not detect a HARQ-ACK response to the PDSCH transmission, or if the eNB detects a "DTX", "NACK / DTX", or "any" status, it is counted as NACK.

[0511] -If the HARQ-ACK value corresponds to a PDSCH transmission on another LAA SCell assigned by the (E)PDCCH sent on the LAA SCell,

[0512] --If the eNB detects a HARQ-ACK response to the PDSCH transmission, the "NACK / DTX" or "any" status is counted as NACK and the "DTX" status is ignored.

[0513] --If the eNB does not detect HARQ-ACK feedback for the PDSCH transmission,

[0514] ---If the eNB expects to use PUCCH format 1 with channel selection, the 'NACK / DTX' state corresponding to 'No Transmission' is counted as NACK, and the 'DTX' state corresponding to 'No Transmission' is omitted.

[0515] ---Otherwise, HARQ-ACK for PDSCH transmission is omitted.

[0516] - If the PDSCH transmission has two codewords, the HARQ-ACK value of each codeword is considered separately.

[0517] - A bundled HARQ-ACK spanning M subframes is considered as M HARQ-ACK responses.

[0518] If the eNB performs transmissions on the channel starting from time t0, including PDCCH / EPDCCH with DCI format 0A / 0B / 4A / 4B but excluding PDSCH associated with channel access priority class p, then the eNB maintains the contention window value CW. p And before step 1 of the process described in sub-clause 2.3.1, adjust CW using the following steps. p To transmit.

[0519] 1> For each priority category p∈{1,2,3,4}, set CW p =CW min,p .

[0520] 2> If at t0 and t0+T CO If less than 10% of the UL transport blocks scheduled by the eNB using type 2CAP (described in sub-clause 2.3.1.2) have been successfully received during the duration between events, then the CW for each priority class p∈{1,2,3,4} will be...p Increase to the second-highest allowable value and remain in step 2; otherwise, proceed to step 1.

[0521] Calculate T as described in sub-clause 2.3.1 CO This will be described below.

[0522] If CW is used K times consecutively p =CW max,p To generate N init Then only K consecutive CW operations are used. p =CW max,p The priority category p's CWp is reset to CW. min,p For each priority category p∈{1,2,3,4}, K is selected by the eNB from the value set {1,2,…,8}.

[0523] 2.3.3.2. Contention Window Adjustment Process for DL ​​Transmission in gNB

[0524] If the gNB performs a transmission on the channel that includes a PDSCH associated with the channel access priority class p, then the gNB maintains the contention window value CW. p And before step 1 of the process described in sub-clause 2.3.1 (i.e., before performing CAP), the following steps are used to regulate CW. p To transmit.

[0525] 1> For each priority category p∈{1,2,3,4}, set CW p =CW min,p .

[0526] 2> If in CW p If HARQ-ACK feedback is available after the final update, proceed to step 3. Otherwise, if the gNB transmission following the procedure described in sub-clause 2.3.1 does not include retransmissions or CWs sent after the procedure described in sub-clause 2.3.1... p The reference duration corresponding to the earliest DL transmission burst after the last update ends at duration T. w If the operation is executed within the specified timeframe, proceed to step 5; otherwise, proceed to step 4.

[0527] 3> The HARQ-ACK feedback corresponding to the PDSCH in the reference duration of the latest DL transmission burst available with HARQ-ACK feedback is used as follows.

[0528] a. If for a PDSCH with TB-based transmissions, at least one HARQ-ACK feedback is “ACK” or for a PDSCH with CBG-based transmissions, at least 10% of the HARQ-ACK feedbacks are “ACK”, then proceed to step 1; otherwise, proceed to step 4.

[0529] 4> For each priority category p∈{1,2,3,4}, calculate the CW. p Increase to the second-highest allowable value.

[0530] 5> For each priority class p∈{1,2,3,4}, maintain CW p Leave as is; proceed to step 2.

[0531] The reference duration and duration T in the above process w Defined as follows.

[0532] - In this sub-clause, the reference duration corresponding to a channel occupancy (including PDSCH transmissions) initiated by the gNB is defined as the duration from the start of the channel occupancy until the end of the first time slot in which at least one unicast PDSCH is transmitted on all resources allocated for the PDSCH, or until the end of the first transmission burst of the gNB containing unicast PDSCHs transmitted on all resources allocated for the PDSCH (the earlier one). If the channel occupancy includes unicast PDSCHs but not any unicast PDSCHs transmitted on all resources allocated for that PDSCH, then the duration of the first transmission burst from the gNB within the channel occupancy containing unicast PDSCHs is the reference duration for CWS conditioning.

[0533] -T w =max(T) A T B +1ms), where TB is the duration (in milliseconds) of the transmission burst starting from the reference duration. If no other technique can guarantee the absence of a shared channel in the long term, then T... A =5ms, otherwise, T A =10ms.

[0534] If the gNB performs a transmission on the channel using Type 1CAP associated with channel access priority class p and this transmission is not associated with explicit HARQ-ACK feedback from the corresponding UE, then the gNB uses the latest CW for any DL transmission of Type 1CAP associated with channel access priority class p on the channel before step 1 of the procedure described in sub-clause 2.3.1. p Adjusting CW p If the corresponding channel access priority category p has not yet been used for any DL transmission on the channel, then CW is used. p =CW min,p .

[0535] 2.3.3.3. Common Procedures for CWS Regulation in DL Transmission

[0536] The following applies to the procedures described in subclauses 2.3.3.1 and 2.3.3.2.

[0537] -If CW p =CW max,p This is used to adjust CW p The second highest permissible value is CW. max,p .

[0538] -If in order to generate N init K consecutive CW p =CW max,p Then it only applies to generating N init K consecutive CW p =CW max,p The priority category p, CW p Reset to CW min The eNB / gNB selects K from the value set {1,2,…,8} for each priority category p∈{1,2,3,4}.

[0539] 2.3.4. Energy detection threshold adaptation process

[0540] The eNB / gNB that accesses the channel to perform the transmission will detect the energy threshold X. Thresh Set to less than or equal to the maximum energy detection threshold X Thresh_max .

[0541] Maximum energy detection threshold X Thresh_max The following determinations are made.

[0542] - If it can be guaranteed in the long term that there are no other technologies that share the channel (e.g., according to regulations), then:

[0543] -

[0544] -X r It is the maximum energy detection threshold (dBm) defined in the regulations when these requirements are defined; otherwise, X r =T max +10dB.

[0545] -otherwise,

[0546] -

[0547] The parameters are defined as follows:

[0548] -T A =10dB, for transmissions including PDSCH;

[0549] -T A =5dB, for transmissions including those that detect bursts as described in sub-clause 4.1.2;

[0550] -Pu =23dBm;

[0551] -P Tx This is the maximum eNB / gNB output power (dBm) set for the channel;

[0552] -eNB / gNB uses the set maximum transmission power on a single channel, regardless of whether single-channel or multi-channel transmission is used.

[0553] -T max (dBm)=10·log 10(3.16228·10 -8 (mW / MHz)·BWMHz(MHz));

[0554] -BWMHz is the single-channel bandwidth (MHz).

[0555] 2.3.5. Channel Access Procedure for Transmission on Multiple Channels

[0556] According to one of the Type A or Type B procedures described below, an eNB / gNB can access multiple channels to perform transmissions.

[0557] 2.3.5.1. Type A Multi-Channel Access Process

[0558] eNB / gNB operates on each channel c according to the process described in this sub-clause. i Channel access is performed on ∈C. In this paper, C is the set of channels that the eNB / gNB is expected to transmit on, and i = 0, 1, ... q-1, where q is the number of channels that the eNB / gNB is expected to transmit on.

[0559] The counter N described in sub-clause 2.3.1 (i.e., the counter N considered in CAP) is for each channel c i Determined and represented as It shall be maintained in accordance with sub-clauses 2.3.5.1.1 or 2.3.5.1.2.

[0560] 2.3.5.1.1. Type A1 Multi-channel Access Procedure

[0561] The counter N described in sub-clause 2.3.1 (i.e., the counter N considered in CAP) is for each channel c i Determined separately and represented as

[0562] Stop any channel c in eNB / gNB i In the case of transmission over ∈C, if it cannot be guaranteed in the long term that there are no other technologies that share the channel (e.g., according to regulations), then for each channel c i (c i Unlike Cj c i ≠c j ), while waiting for 4·T sl The duration after or in the future When an idle sensing slot is detected after reinitialization, the eNB / gNB can recover and reduce [its capacity].

[0563] 2.3.5.1.2. Type A2 Multichannel Access Procedure

[0564] For each channel c j ∈C, the counter N is determined and represented as described in subclause 2.3.1. Where c j It has the largest CW p The value of the channel. For each channel c i ,

[0565] When eNB / gNB stops determining When transmitting on any of the channels, the eNB / gNB will transmit all channels. Reinitialize.

[0566] 2.3.5.2. Type B Multichannel Access Procedure

[0567] Channel c can be selected by the eNB / gNB as follows: j ∈C.

[0568] -eNB / gNB uses multiple channels c i Each transmission on ∈C is preceded by a uniformly random selection of c from C. j Choose C j ,or

[0569] -eNB / gNB select c j The frequency does not exceed once per second.

[0570] In this paper, C is the set of channels that the eNB / gNB is expected to transmit on, and i = 0, 1, ..., q-1, where q is the number of channels that the eNB / gNB is expected to transmit on.

[0571] In order to in channel c j The eNB / gNB transmits the data to channel c according to the procedures described in sub-clause 2.2.1 and the modifications described in sub-clauses 2.3.5.2.1 or 2.3.5.2.2. j Perform channel access.

[0572] In order to in channel c i Channel c in ∈C i ≠c j Send it online.

[0573] -For each channel c i eNB / gNB at least immediately following channel c j The sensing interval T before transmission on mc =25µs sensing channel c i eNB / gNB can be used for at least the sensing duration T mc Internal sensing channel c i Immediately after idle, in channel c i The transmission is performed on the given duration T. mc In the middle of channel c j If the channel is sensed as idle for the entire duration of this idle sensing, then channel c i Can be considered as T mc Internal free space.

[0574] eNB / gNB, as shown in Table 12, exceeds T mcot,p Not in channel c during the period i ≠c j (where c) i Transmission is performed on (∈C), where the channel c is used. j The channel access parameters determine T mcot,p The value of .

[0575] For the process in this sub-clause, the channel frequencies of the channel set C selected by gNB are a subset of one of the predefined sets of channel frequencies.

[0576] 2.3.5.2.1. Type B1 Multichannel Access Procedure

[0577] Maintain a single CW for the channel set C p value.

[0578] To determine CW p For use in channel c j For channel access, follow step 2 of the process described in sub-clause 2.3.3.

[0579] -If with all channels c i If at least Z = 80% of the HARQ-ACK values ​​corresponding to the PDSCH transmission in reference subframe k ∈ C are determined to be NACK, then the CW values ​​for each priority class p ∈ {1, 2, 3, 4} will be... p Increase to the second highest allowable value; otherwise, go to step 1.

[0580] To determine the CW of channel set C p It can be used with any channel c in the process described in sub-clause 2.3.3.2. i Any PDSCH that is completely or partially overlapping with C.

[0581] 2.3.5.2.2. Type B2 Multichannel Access Procedure

[0582] Use the procedure described in sub-clause 2.3.3 for each channel c i ∈C independently maintains value CW p To determine channel c i CW p The process described in sub-clause 2.3.3.2 may use channel c. i Any PDSCH that completely or partially overlaps. To determine channel c j N init Using channel c j1 CW of ∈C p Value, where c j1 It is the channel with the largest CW among all channels in set C. p The channel.

[0583] 2.4. Uplink Channel Access Process

[0584] The UE and the BS that schedules or configures UL transmissions for the UE perform the following procedures to enable the UE to access the channel (performing LAA SCell transmissions). Assuming that the UE and BS are essentially configured with a PCell as a licensed band and one or more SCells as unlicensed bands, the following description of various implementations of UL CAP applying this disclosure is given. However, UL CAP can also be applied in the same manner when only unlicensed bands are configured for the UE and BS.

[0585] 2.4.1. Channel access procedure for uplink transmission

[0586] The UE may access a channel performing UL transmissions according to either Type 1 or Type 2 UL CAP. Type 1 CAP is described in sub-clause 2.3.1.1. Type 2 CAP is described in sub-clause 2.3.1.2.

[0587] If the UL license indication type 1CAP is used to schedule the PUSCH transmission, the UE executes type 1CAP to perform the transmission that includes the PUSCH transmission, unless otherwise stated in this sub-clause.

[0588] If the UL license indication type 2CAP is used to schedule the PUSCH transmission, the UE executes type 2CAP to perform the transmission that includes the PUSCH transmission, unless otherwise stated in this sub-clause.

[0589] The UE performs type 1CAP to perform transports including autonomous PUSCH transports in the configured UL resources, unless otherwise stated in this sub-clause.

[0590] UE execution type 1CAP is used to execute SRS transmissions that do not include PUSCH transmissions. UL channel access priority category p=1 is used for SRS transmissions that do not include PUSCH.

[0591] [Table 18]

[0592]

[0593] 2.4.1.1. Channel Access Procedure and UL-Related Signaling

[0594] If the UE detects the "UL Configuration for LAA" field and / or the "UL Duration and Offset" field (e.g., in DCI Format 1C), the following applies.

[0595] - If the "UL Configuration for LAA" field and / or the "UL Duration and Offset" field are configured for subframe n and / or indicate "UL Offset" 1 and "UL Duration" d, then if the end of the UE transmission occurs in or before subframe n+l+d-1, the UE can use type 2CAP to perform the transmission in subframe n+l+i (where i = 0, 1, ... d-1), regardless of the channel access type signaled for those subframes in the UL license.

[0596] - If the "UL Configuration for LAA" field and / or the "UL Duration and Offset" field are configured and / or indicate "UL Offset" 1 and "UL Duration" d for subframe n and the "COT Sharing Indication for AUL" field is set to "1", then if the end of the UE autonomous UL transmission occurs in or before subframe n+l+d-1 and the autonomous UL transmissions between n+l and n+l+d-1 are contiguous, assuming any priority class in subframe n+l+i (where i = 0, 1, ... d-1), a UE configured with autonomous UL can use type 2CAP to perform autonomous UL transmission.

[0597] - If the "UL Configuration for LAA" field and / or the "UL Duration and Offset" field indicate "UL Offset" l and "UL Duration" d for subframe n and the "COT Sharing Indication for AUL" field is set to "0", then a UE configured with autonomous UL should not transmit autonomous UL in subframe n+l+i (where i = 0, 1, ... d-1).

[0598] 2.4.1.2. Channel Access Procedure for Continuous UL Transmission

[0599] For adjacent UL transmissions, the following applies.

[0600] - If a UE is scheduled to perform a UL transmission set including a PUSCH using a UL license, and the UE is unable to access a channel for a transmission in the set before the last transmission, the UE should attempt to send the next transmission according to the channel access type indicated by the UL license.

[0601] - If the UE is scheduled to perform a continuous set of UL transmissions without gaps, including PUSCH, using one or more UL licenses, and if the UE transmits one of the scheduled UL transmissions in the set after accessing the channel according to one of the Type 1 or Type 2 UL CAPs, the UE may continue transmission of the remaining UL transmissions in the set (if any).

[0602] -UE does not expect to indicate different channel access types for any consecutive UL transmissions without gaps between transmissions.

[0603] For adjacent UL transmissions that include transmission pauses, the following applies.

[0604] - If the UE is scheduled to perform a set of consecutive UL transmissions without gaps using one or more UL licenses, and if the UE has stopped transmitting during or before one of these UL transmissions in the set and before the last UL transmission in the set, and if the UE senses that the channel is continuously idle after the UE has stopped transmitting, the UE may use type 2CAP to transmit the later UL transmission in the set.

[0605] - If the channel sensed by the UE is not continuously idle after the UE has stopped transmitting, the UE can use Type 1CAP with the UL channel access priority category indicated in the DCI corresponding to the UL transmission to perform a later UL transmission in the set.

[0606] 2.4.1.3. Conditions for Maintaining Type 1 UL Channel Access Procedures

[0607] If the UE receives a UL-licensed DCI indicating that a PUSCH transmission using type 1 CAP is scheduled and / or a DL-licensed DCI indicating that a PUCCH transmission using type 1 CAP is scheduled, and if the UE has an ongoing type 1 CAP before the PUSCH or PUCCH transmission start time,

[0608] - If the UL channel access priority category value p1 used for the ongoing Type 1CAP is equal to or greater than the UL channel access priority category value p2 indicated by the DCI, the UE can perform PUSCH transmission in response to UL permission by using the ongoing Type 1CAP access channel.

[0609] - If the UL channel access priority category value p1 used for the ongoing Type 1 CAP is less than the UL channel access priority category value p2 indicated by the DCI, the UE terminates the ongoing CAP.

[0610] - The UE can perform PUCCH transmissions in response to DL permission by using the ongoing Type 1 CAP access channel.

[0611] 2.4.1.4. Conditions for indicating type 2 channel access procedures

[0612] If the BS has transmitted on the channel in accordance with the CAP described in sub-clause 2.3.1, the BS may indicate type 2CAP in the UL-licensed DCI that schedules the transmission of PUSCH on the channel in subframe n.

[0613] Alternatively, when the BS has transmitted on the channel in accordance with the CAP described in sub-clause 2.3.1, the BS may indicate that the BS may use the “UL configuration for LAA” field and / or the “UL duration and offset” field to indicate that the UE may perform type 2 CAP on the channel in subframe n for transmission including PUSCH.

[0614] Alternatively, if the UL transfer occurs from t0 to t0+T CO During the end of the time interval, the BS can schedule UL transmission on the channel, followed by the BS performing UL transmission on that channel using type 2A CAP. In this paper, T CO =T mcot,p +T g And each parameter can be defined as follows.

[0615] -t0: The time when the BS has started transmitting.

[0616] -T mcot,p The value determined by BS as described in Sub-clause 2.2.

[0617] -Tg: Starting from t0, the total duration of all gaps with a duration greater than 25us that occur between DL transmissions of the BS and UL transmissions scheduled by the BS, as well as between any two UL transmissions scheduled by the BS.

[0618] If UL transmission can be scheduled by adjacent grounding, then BS at t0 and t0+T CO UL transmissions are scheduled without gaps between consecutive UL transmissions within the system.

[0619] For duration T short_ul =After the BS transmits on the channel within 25us, the UL transmits on the channel. The UE can perform type 2A CAP for the UL transmission.

[0620] If the BS indicates type 2CAP to the UE via DCI, then the BS indicates the channel access priority category used to obtain access to the channel via DCI.

[0621] 2.4.1.5. Channel Access Procedure for UL Multichannel Transmission

[0622] If UE

[0623] - Scheduled to transmit on channel set C if UL transmission is permitted by UL scheduling indication type 1CAP for UL transmission on channel set C, and if UL transmission is scheduled to start simultaneously on all channels in channel set C, and / or

[0624] - The aim is to utilize Type 1CAP to perform UL transmissions on configured resources on channel set C, and

[0625] If the channel frequencies of channel set C are a subset of one of the pre-configured channel frequency sets,

[0626] -UE can use type 2CAP in channel c i Send on ∈C.

[0627] --If it is immediately followed by channel c j Before UE transmission on channel c ∈C (where i≠j) i The execution type is 2CAP, and

[0628] -If the UE is already using Type 1 CAP access channel c j ,

[0629] ---Before performing Type 1 CAP on any channel in the channel set C, the UE randomly selects channel c uniformly from the channel set C. j .

[0630] - If the UE fails to access any channel, then the UE cannot access the channel within the carrier bandwidth scheduled or configured by the UL resources. i Send on ∈C.

[0631] 2.4.2. Type 1 UL Channel Access Procedure

[0632] This sub-clause describes the CAP performed by the UE, where the duration spanned by a sensing slot sensed as idle prior to UL transmission is random. This sub-clause applies to the following transmissions.

[0633] - PUSCH / SRS transmissions scheduled or configured by the BS.

[0634] - PUCCH transmissions scheduled or configured by the BS.

[0635] -Transmissions related to the Random Access Procedure (RAP).

[0636] UE can delay duration T d After the channel is sensed to be idle during the time slot duration, transmission is performed using type 1 CAP, and the counter N is zero in step 4. The counter N is adjusted by sensing the channel during the additional time slot duration according to the following procedure.

[0637] 1) Let N = N init , where N init It is uniformly distributed between 0 and CW p A random number between [a certain number] is determined, and then proceed to step 4.

[0638] 2) If N>0 and the UE chooses to decrease the counter, then set N=N-1.

[0639] 3) Sensing the channel during the additional time slot duration, and if the additional time slot duration is idle, proceed to step 4; otherwise, proceed to step 5.

[0640] 4) If N = 0, stop; otherwise, go to step 2.

[0641] 5) Sensing the channel until the additional delay duration T d Busy time slots or additional delay duration T detected within the time slot. d All time slots were detected as idle.

[0642] 6) If there is an additional delay duration T d If the channel is sensed to be idle during all time slot durations, proceed to step 4; otherwise, proceed to step 5.

[0643] Figure 21 This is a diagram illustrating the various embodiments of this disclosure to which a UL CAP is applicable for transmission in an unlicensed frequency band.

[0644] The above-mentioned UE type 1UL CAP can be summarized as follows.

[0645] For UL transmissions, the transmission node (e.g., UE) can initiate CAP to operate in the unlicensed band (2110).

[0646] The UE can randomly select a backoff counter N within the CW according to step 1. N is set to the initial value N. init (2120). N init It is in 0 and CW p A value randomly selected from among them.

[0647] Subsequently, when the backoff counter value N is 0 according to step 4 (2130; Yes), the UE terminates CAP (2132). The UE can then send a Tx burst (2134). On the other hand, if the backoff counter value is not 0 (2130; No), the UE decrements the backoff counter value by 1 according to step 2 (2140).

[0648] The UE then checks if the channel is idle (2150). If the channel is idle (2150; yes), the UE checks if the backoff counter value is 0 (2130).

[0649] Conversely, if the channel is not idle, i.e., the channel is busy (2150; no), the UE proceeds according to step 5 for a delay duration T longer than the time slot duration (e.g., 9µs). d Check if the channel is idle within 25µs or longer (2160). If the channel is idle within the delay duration (2170; yes), the UE can resume CAP.

[0650] For example, if the backoff counter value N init If the backoff counter value is 10 and the channel is determined to be idle after the backoff counter value decreases to 5, the UE senses the channel and determines whether the channel is idle during the delay duration. If the channel is idle during the delay duration, the UE can re-execute CAP from the backoff counter value of 5 (or the backoff counter value of 4 after decrementing the backoff counter value by 1), instead of setting the backoff counter value N. init .

[0651] On the other hand, if the channel is busy during the delay period (2170; no), the UE checks the channel again for free during the new delay period by performing operation 2160 again.

[0652] If the UE has not performed UL transmission on the channel on which UL transmission is performed after step 4 in the above process, the UE may perform UL transmission on the channel if the following conditions are met:

[0653] -When the UE is ready to perform a transmission, if at least during the sensing time slot duration T sl The middle channel was sensed as idle; and

[0654] -If the delay duration T immediately preceding the transmission d The channel was sensed as idle for the duration of all time slots.

[0655] Conversely, if the UE senses the channel for the first time after being ready to transmit during the sensing time slot duration T... sl The middle channel has not yet been sensed as idle, or if there is a delay duration T immediately preceding the expected transmission. dIf the channel has not been sensed as idle during any sensing time slot duration, then during the delay duration T d After sensing that the channel is idle during the time slot duration, the UE proceeds to step 1.

[0656] Delay duration T d Including m p The duration T of a consecutive time slot f (=16us), where the duration T of each time slot sl It is 9us, and T f Including T f The duration T of the idle time slot at the beginning sl .

[0657] CW min,p ≤CW p ≤CW max,p It's a competitive window. CW p The regulation is described in sub-clause 2.3.2.

[0658] Select CW before step 1 of the above process. min,p and CW max,p .

[0659] m p CW min,p and CW max,p Based on the channel access priority category notified to the UE via signaling (see Table 18).

[0660] As described below, X shall be adjusted in accordance with sub-clause 2.3.3. Thresh .

[0661] 2.4.3. Type 2 UL Channel Access Procedure

[0662] This sub-clause describes the CAP performed by the UE, where the duration spanned by the sensing slot that is idle prior to UL transmission is deterministic.

[0663] If the BS instructs the UE to perform type 2 UL CAP, the UE follows the procedure described in subclause 2.4.3.1.

[0664] 2.4.3.1. Type 2A UL Channel Access Procedure

[0665] If the UE is instructed to perform Type 2A UL CAP, the UE will perform UL transmission using Type 2A UL CAP. The UE can perform this transmission for at least the sensing duration T. short_ul = Transmission is initiated immediately after the channel is detected to be idle within 25µs. T short_ul Including a time slot sensing time slot duration T immediately following it sl =9us duration Tf =16us, and T f Including T f The initial sensing time slot. If T short_ul If both sensing slots are sensed as idle, then the channel is considered to be in T short_ul Internal free space.

[0666] 2.4.3.2. Type 2B UL Channel Access Procedure

[0667] If the UE is instructed to perform Type 2B UL CAP, then the UE uses Type 2B UL CAP for UL transmission. The UE can perform UL transmissions using T... f Transmission is initiated immediately after the channel is detected to be idle within a duration of 16µs. f Including events occurring in T f The sensing time slot within the last 9 µs. If the channel is sensed as idle for at least 5 µs in total, and sensing occurs for at least 4 µs within the sensing time slot, the channel is considered to be idle for duration T. f Internal free space.

[0668] 2.4.3.3. Type 2C UL Channel Access Procedure

[0669] If the UE is instructed to perform Type 2C UL CAP for UL transmission, the UE does not sense the channel before transmission. The duration of the corresponding UL transmission is up to 584 µs.

[0670] 2.4.4. Competition Window Adjustment Process

[0671] If the UE performs a transmission on the channel associated with the channel access priority class p, the UE maintains the contention window value CW. p And adjust CW before step 1 of the process described in sub-clause 2.4.2 (i.e., before performing CAP). p For use in transmission.

[0672] 2.4.4.1. Contention window adjustment process for UL transmissions scheduled / configured by eNB

[0673] If the UE performs transmission on the channel using Type 1 CAP associated with the channel access priority class p, the UE maintains the contention window value CW. p Before step 1 of the process described in sub-clause 2.4.1 (i.e., before performing CAP), the following process shall be used to regulate CW. p For use in transmission.

[0674] - If the UE receives UL authorization and / or Autonomous Uplink-Downlink Feedback Information (AUL-DFI), the contention window size for all priority categories is adjusted as follows.

[0675] --If the New Data Indicator (NDI) value of at least one HARQ process associated with HARQ_ID_ref is switched, and / or if the value associated with n ref The HARQ-ACK value of at least one HARQ process associated with HARQ_ID_ref received in the earliest AUL-DFI after +3 indicates ACK.

[0676] ---For each priority category p∈{1,2,3,4}, set CW p =CW min,p .

[0677] --Otherwise, the CW for each priority category p∈{1,2,3,4} p Increase to the second-highest allowable value.

[0678] In this article, HARQ_ID_ref is the reference subframe n ref The HARQ process ID of UL-SCH in the reference subframe n. ref The following determinations are made.

[0679] -If the UE is in subframe n g If a UL license is received in subframe n, then subframe n w The UE has sent a subframe n of UL-SCH using type 1 CAP. g The nearest subframe before -3.

[0680] --If the UE starts with subframe n0 and is in subframes n0, n1, ..., n w If the transmission including UL-SCH is performed without gaps, then refer to subframe n. ref It is subframe n0.

[0681] --Otherwise, refer to subframe n ref It is a subframe n w .

[0682] If the UE is scheduled to use type 1 CAP in subframe set n0, n1, ..., n w-1 The UE performs gapless transmissions including PUSCH within the subframe set, and if the UE is unable to perform any transmissions including PUSCH within the subframe set, the UE may retain the value CW for each priority category p∈{1,2,3,4}. p constant.

[0683] If the reference subframe for the last scheduled transmission is also n ref Then the UE can maintain the value CW for each priority category p∈{1,2,3,4}. p The same as the last scheduled transport including PUSCH using type 1CAP.

[0684] If CWp =CW max,p This is used to adjust CW p The second highest permissible value is CW max,p .

[0685] If in order to generate N init K consecutive CW p =CW max,p Then it only applies to generating N init K consecutive CW p =CW max,p The priority category p, CW p Reset to CW min,p The UE selects K from the value set {1,2,…,8} for each priority category p∈{1,2,3,4}.

[0686] 2.4.4.2. Contention window adjustment process for UL transmissions scheduled / configured by gNB

[0687] If the UE performs transmission on the channel using Type 1 CAP associated with the channel access priority class p, the UE maintains the contention window value CW. p And before step 1 of the process described in sub-clause 2.4.1 (i.e., before performing CAP), adjust the CW for those transmissions using the following steps. p .

[0688] 1> For each priority category p∈{1,2,3,4}, set CW p =CW min,p .

[0689] 2> If in CW p If HARQ-ACK feedback is available after the last update, proceed to step 3. Otherwise, if the UE transmission after the procedure described in sub-clause 2.4.1 does not include retransmissions or CWs sent after the procedure described in sub-clause 2.4.1... p The reference duration corresponding to the earliest UL transmission burst after the last update ends at duration T. w If the operation is executed within the specified timeframe, proceed to step 5; otherwise, proceed to step 4.

[0690] 3> The HARQ-ACK feedback corresponding to the PUSCH in the reference duration of the latest UL transmission burst that is available for HARQ-ACK feedback is used as follows.

[0691] a. If at least one HARQ-ACK feedback is an "ACK" for a PUSCH with TB-based transport, or if at least 10% of the HARQ-ACK feedbacks are "ACKs" for a PUSCH with CBG-based transport, then proceed to step 1; otherwise, proceed to step 4.

[0692] 4> For each priority category p∈{1,2,3,4}, calculate the CW. p Increase to the second-highest allowable value.

[0693] 5> For each priority class p∈{1,2,3,4}, maintain CW p Leave as is; proceed to step 2.

[0694] The HARQ-ACK feedback, reference duration, and duration T in the above process w Defined as follows.

[0695] - HARQ-ACK feedback for PUSCH transmissions is expected to be provided to the UE explicitly or implicitly, wherein the implicit HARQ-ACK feedback for contention window adjustment in this sub-clause is determined based on the new transmission or retransmission indication in the DCI that schedules the PUSCH.

[0696] --If a new transmission is indicated, then "ACK" is assumed in the corresponding PUSCH for TB-based and CBG-based transmissions, respectively.

[0697] --If a TB-based transmission indication is retransmitted, then "NACK" is assumed for the TB in the corresponding PUSCH.

[0698] --If a CBG-based transmission indication retransmission is requested, and if the bit value in the Block Group Transmission Information (CBGTI) field is "0" or "1", then "ACK" or "NACK" is assumed for the corresponding CBG in the corresponding PUSCH, respectively.

[0699] - In this sub-clause, the reference duration corresponding to a channel occupancy initiated by the UE (including the transmission of PUSCH) is defined as the duration from the start of the channel occupancy until the end of the first time slot in which at least one unicast PUSCH is transmitted on all resources allocated for the PDSCH, or until the end of the first transmission burst of the gNB containing unicast PUSCH transmitted on all resources allocated for the PDSCH (the earlier one). If the channel occupancy includes a unicast PUSCH but not any unicast PUSCH transmitted on all resources allocated for that PUSCH, then the duration of the first transmission burst of the UE within the channel occupancy containing the PUSCH is the reference duration for CWS adjustment.

[0700] -T w =max((T) A ,T B +1ms) where TB is the duration (ms) of the transmission burst starting from the reference duration. If it cannot be guaranteed in the long term that there are no other technologies that share the channel (e.g., according to regulations), then TA =5ms, otherwise, T A =10ms.

[0701] If the UE performs a transmission on a channel using Type 1CAP associated with channel access priority class p and this transmission is not associated with the explicit or implicit HARQ-ACK feedback described above in this sub-clause, then the UE uses the latest CW for any UL transmission using Type 1CAP associated with channel access priority class p on the channel prior to step 1 of the procedure described in sub-clause 2.4.1. p To adjust CW p If the corresponding channel access priority category p has not yet been used for any UL transmission on the channel, then CW is used. p =CW min,p .

[0702] 2.4.4.3. Common Procedures for CWS Conditioning for UL Transmission

[0703] The following applies to the procedures described in subclauses 2.4.4.1 and 2.4.4.2.

[0704] -If CW p =CW max,p This is used to adjust CW p The second highest allowable value is CW max,p .

[0705] -If in order to generate N init K consecutive CW p =CW max,p Then it only applies to generating N init K consecutive CW p =CW max,p The priority category p, CW p Reset to CW min The UE selects K from the value set {1,2,…,8} for each priority category p∈{1,2,3,4}.

[0706] 2.4.5. Energy detection threshold adaptation process

[0707] UEs accessing the channel performing UL transmission should set the energy detection threshold X. Thres Set to less than or equal to the maximum energy detection threshold X Thresh_max .

[0708] Maximum energy detection threshold X Thresh_max The following determinations are made.

[0709] - If the UE is configured with higher-layer parameters maxEnergyDetectionThreshold-r14 and / or maxEnergyDetectionThreshold-r16

[0710] --X Thresh_max It is set to be equal to the value signaled by the higher-level parameters.

[0711] -otherwise,

[0712] --UE should determine X' according to the procedure described in sub-clause 2.3.3.1 Thresh_max .

[0713] --If the UE is configured with higher-level parameters energyDetectionThresholdOffset-r14 and / or energyDetectionThresholdOffset-r16,

[0714] ---Adjust X according to the offset value signaled by higher-level parameters Thresh_max To set X' Thresh_max .

[0715] --otherwise,

[0716] ---UE Settings X Thresh_max =X' Thresh_max .

[0717] 2.3.3.1. Calculation process for the default maximum energy detection threshold

[0718] If you provide the high-level parameters "absenceOfAnyOtherTechnology-r14" and / or "absenceOfAnyOtherTechnology-r16":

[0719] -

[0720] -where X r This is the maximum energy detection threshold (dBm) defined in the regulations when these requirements are defined. Otherwise, X r =T max +10dB

[0721] otherwise:

[0722] -

[0723] in

[0724] -T A =10dB

[0725] -P H=23dBm;

[0726] -P TX Set as P CMLAX_H.c value

[0727] -T max (dBm)=10·log10(3.16228·10 -8 (mW / MHz)·BWMHz(MHz))

[0728] -BWMHz is the single-channel bandwidth (MHz).

[0729] 3. Various embodiments of this disclosure

[0730] Detailed descriptions of various embodiments of this disclosure will be provided based on the above technical concepts. The foregoing content of Clauses 1 and 2 applies to the various embodiments of this disclosure described below. For example, operations, functions, terms, etc., not defined in the various embodiments of this disclosure may be performed and described based on Clauses 1 and 2.

[0731] The symbols / abbreviations / terms used in the description of the various embodiments of this disclosure are defined as follows.

[0732] -PDCCH: Physical Downlink Control Channel

[0733] -PDSCH: Physical Downlink Shared Channel

[0734] -PUSCH: Physical Uplink Shared Channel

[0735] -CSI: Channel State Information

[0736] -RRM: Radio Resource Management

[0737] -DCI: Downlink Control Information

[0738] -CAP: Channel Access Procedure

[0739] -Ucell: Unlicensed Cell

[0740] -TBS: Transport Block Size

[0741] -SLIV: Start and Length Indicator Value (A field indicating the index of the start symbol and the number of symbols in the PDSCH and / or PUSCH slots. This field can be carried on the PDCCH that schedules the PDSCH and / or PUSCH.)

[0742] -BWP: Bandwidth portion (which may include adjacent RBs on the frequency axis and corresponds to a set of parameters (e.g., SCS, CP length, slot / mini slot duration, etc.). Although multiple BWPs can be configured in a carrier (e.g., the number of BWPs per carrier may be limited), the number of active BWPs may be limited to a value less than the number of multiple BWPs in a carrier (e.g., 1).

[0743] -CORESET: Control resource set (time and frequency resource area for sending PDCCH. The number of CORESETs per BWP is limited.)

[0744] -REG: Resource Element Group

[0745] -SFI: Slot Format Indicator (An indicator that indicates the symbol-level DL / UL direction in a specific slot, which can be transmitted on the GC-PDCCH.)

[0746] -COT: Channel Occupancy Time

[0747] -CO Structure: Channel Occupancy Structure. This may relate to one or more time-domain and / or frequency-domain resources occupied by the BS / UE for transmission on the channel after CAP is performed. The term CO structure may be used interchangeably with COT structure for equivalent meaning.

[0748] -SPS: Semi-persistent scheduling

[0749] As more and more communication devices require greater communication capacity, the efficient use of limited frequency bands has become a significant requirement. Against this backdrop, cellular communication systems such as 3GPP LTE / NR are considering technologies that utilize unlicensed frequency bands (e.g., the 2.4 GHz band primarily used in traditional WiFi systems, or the newly emerging 5 GHz and / or 60 GHz bands). In the following text, the term unlicensed frequency band may be replaced by unlicensed spectrum or shared spectrum.

[0750] To transmit signals in the unlicensed frequency band, the UE or BS uses radio transmission and reception based on contention between communication nodes. That is, when each communication node wants to transmit a signal in the unlicensed frequency band, it can confirm that another communication node is not transmitting a signal in the unlicensed frequency band by performing channel sensing before signal transmission. For ease of description, this operation is defined as Listen Before Talk (LBT) or CAP. Specifically, checking whether another communication node is transmitting a signal is defined as Carrier Sense (CS), and determining that another communication node is not transmitting a signal is defined as Acknowledging Clear Channel Assessment (CCA).

[0751] In the LTE / NR systems to which the various embodiments of this disclosure are applicable, the eNB / gNB or UE may also be required to perform LBT operation or CAP for signal transmission in the unlicensed frequency band. In other words, the eNB / gNB or UE may use or transmit signals in the unlicensed frequency band based on CAP.

[0752] Furthermore, when an eNB / gNB or UE transmits signals in an unlicensed frequency band, other communication nodes, such as WiFi nodes, should not interfere with the eNB / gNB or UE by performing CCA (Continuous Capability Assist). For example, WiFi standards (e.g., 801.11ac) specify a CCA threshold of -62dBm for non-WiFi signals and -82dBm for WiFi signals. Therefore, for example, when a signal other than a WiFi signal is received at -62dBm or higher, a station (STA) or access point (AP) operating according to the WiFi standard may refrain from transmitting signals to prevent interference.

[0753] In the following description of various embodiments of this disclosure, when it is said that the BS's CAP is successful, this may mean that the BS determines that the unlicensed band is idle, and therefore begins transmitting signals in the unlicensed band at a specific time. Conversely, when it is said that the BS's CAP fails, this may mean that the BS determines that the unlicensed band is busy, and therefore does not begin transmitting signals in the unlicensed band at a specific time.

[0754] To coexist with WiFi systems that perform CAP in 20MHz units, the carrier bandwidth in LTE LAA systems is essentially limited to 20MHz. However, in NR systems, the carrier bandwidth can vary depending on the SCS. Therefore, the carrier bandwidth can be greater than 20MHz. Furthermore, the UE can be configured with a BWP that has a narrower carrier bandwidth than the gNB operates on. This also applies to NR-Unlicensed Band (NR-U) systems. Considering the frequency units performing CAP in WiFi systems, the carrier bandwidth in NR-U systems can be set to multiples of 20MHz.

[0755] Therefore, 20MHz has the meaning of a frequency unit for performing CAP, and those skilled in the art will clearly understand that various embodiments of this disclosure are not limited to the specific frequency value of 20MHz.

[0756] Furthermore, the aforementioned carrier bandwidth can be understood as broadband, and the frequency unit for performing CAP can be understood as CAP subband and / or CAP (LBT) bandwidth and / or channel. CAP subband and / or LBT bandwidth and / or channel are carriers or a portion of a carrier that includes the set of adjacent RBs performing CAP within unlicensed bands (and / or shared spectrum).

[0757] When a set of continuous transmissions without gaps on the time axis from a single transmission node (gNB and / or UE) in an unlicensed band NR system is referred to as a burst or Tx burst, the various embodiments of this disclosure described below may relate to methods for transmitting and receiving initial signals indicating burst transmissions and enabling burst transmissions to be identified, PDCCH monitoring methods, and cross-carrier scheduling (CCS) methods.

[0758] In NR systems, for example, the scheduling unit is the time slot, and time-domain structures can be supported or allowed to be filled only a portion of the time slots for transmission (mini-slot transmission). For example, this could be a time-domain structure that is considered to support unlicensed frequency bands.

[0759] Therefore, considering the time-domain structure of NR systems, although the following description of various embodiments of this disclosure focuses on operation in unlicensed bands (and NR systems operating in unlicensed bands), those skilled in the art will understand that various embodiments of this disclosure are also readily applicable to licensed bands (and NR systems operating in licensed bands).

[0760] The operation of various embodiments according to this disclosure will now be described in detail. Those skilled in the art will understand that, unless contradictory, the various embodiments of this disclosure described below can be combined, in whole or in part, to constitute other various embodiments of this disclosure.

[0761] 3.1. Methods for sending and receiving initial signals

[0762] Figure 23 This is a diagram illustrating exemplary methods for transmitting and receiving initial signals according to various embodiments of the present disclosure.

[0763] Reference Figure 23 In operation 2301 according to an exemplary embodiment of this disclosure, the BS may perform a DL CAP for an unlicensed frequency band to transmit DL signals to the UE. For example, the DL CAP may be one or more of the various DL CAPs described above for DL ​​transmission.

[0764] In operation 2303 of an exemplary embodiment of the present disclosure, when the BS determines via DL CAP that the unlicensed band is available (or the channel configured in the unlicensed band is idle), the BS may transmit an initial signal and / or a DL signal to the UE in the unlicensed band (or on the channel configured in the unlicensed band) based on the methods of various embodiments of the present disclosure.

[0765] Therefore, for example, the UE can anticipate the BS transmitting the DL signal based on an initial signal received earlier than the DL signal. Thus, the UE can receive the DL signal from the BS.

[0766] For example, the UE can send or receive signals associated with received DL signals to or from the BS. For example, when the UE wants to send a specific signal to the BS, the UE can send the specific signal to the BS based on the result of the UL CAP. For example, the UL CAP can be one or more of the various UL CAPs mentioned above used for UL transmission.

[0767] In the description of this sub-clause and various embodiments of this disclosure, the determination of COT inside / outside may refer to the acquisition / transmission of DL bursts based on DL signals and / or PDCCH in [Method #1-1A], [Method #1-2A], [Method #1-1B] and [Method #1-2B] as described below.

[0768] The information elements (IEs) described in this sub-clause and in various embodiments of this disclosure may be defined as follows.

[0769] For example, precoder granularity is an IE included in the RRC parameter ControlResourceSet used to configure the time and / or frequency CORESET for DCI detection. This IE, for instance, can provide information about the precoder granularity on the frequency axis.

[0770] For example, precoderGranularity can be set to one of sameASREG-bundle and allContiguousRBs (ENUMERATED{sameASREG-bundle,allContiguousRBs}).

[0771] For example, sameASREG-bundle could be information indicating that the granularity of the frequency domain precoder for each CORESET is equal to the size of the frequency domain REG bundle.

[0772] For example, allContiguousRBs could be information indicating that the frequency domain precoder granularity of each CORESET is equal to the number of frequency domain adjacent RBs in the CORESET.

[0773] For example, pdcch-DMRS-ScramblingID is an IE included in the ControlResourceSet, an RRC parameter used to configure the time and / or frequency CORESET for DCI detection. pdcch-DMRS-ScramblingID can be an RRC parameter used for PDCCH DMRS scrambling initialization.

[0774] For example, searchSpaceType can be an IE included in the RRC parameter SearchSpace that defines how and / or where to detect PDCCH (PDCCH candidates), and each search space can be associated with a ControlResourceSet.

[0775] For example, searchSpaceType can be an RRC parameter indicating the CSS and / or USS and / or DCI formats used for monitoring.

[0776] For example, frequencyDomainResources can be an IE included in the RRC parameter ControlResourceSet.

[0777] For example, frequencyDomainResources can provide information about CORESET's frequency domain resources.

[0778] Now, a description of specific operations of a UE and / or BS based on the initial signal transmission and reception methods according to various embodiments of this disclosure will be given.

[0779] For example, when generating transmission data or signals / channels such as RS for measurement need to be periodically transmitted at the BS in a licensed channel / carrier, the transmission can be guaranteed to start at the expected time.

[0780] On the other hand, even if the BS intends to transmit a DL signal on an unlicensed channel / carrier at a specific time, it may not begin transmission if its CAP fails immediately before that specific time. That is, depending on whether the BS's CAP succeeds, the BS may or may not transmit a signal on the unlicensed channel / carrier. Therefore, the UE needs to identify when the BS begins transmission, and thus requires a signal indicating whether DL transmission is actually performed. This signal indicating whether DL transmission is actually performed can be called the initial signal.

[0781] For example, an initial signal can be sent at the beginning of a Tx burst.

[0782] In another example, an initial signal can be sent at each specific time unit of a Tx burst (each specific time unit, for example, each time slot boundary in a Tx burst).

[0783] According to various embodiments of this disclosure, an initial signal can be transmitted in an unlicensed channel / carrier for at least the following purposes.

[0784] 1> For example, in order to receive DCI in a Tx burst from the serving cell and receive PDSCH scheduled by DCI.

[0785] 2> For example, to perform CSI measurements in CSI-RS sent in a Tx burst from the serving cell.

[0786] 3> For example, to perform RRM measurements on signals from Tx bursts from serving cells / neighboring cells.

[0787] 4> For example, for automatic gain control (AGC) gain settings: for example, an initial signal can be used to set the AGC to receive bursts sent after the initial signal.

[0788] 5. For example, (coarse or fine) time and / or frequency synchronization: For example, the initial signal can be used for accurate time and / or frequency synchronization between signals to be periodically transmitted (for RRM or CSI measurements). Alternatively, for example, the initial signal can be used to detect frame / subframe / slot / symbol boundaries. Alternatively, for example, NR nodes can typically attempt to find / detect the initial signal without FFT, and FFT can be performed only when the initial signal is found / detected. In this case, there can be a gain in terms of battery saving.

[0789] 6> For example, to save power: For instance, the UE does not perform or performs minimal DL reception operations (e.g., PDCCH monitoring) until an initial signal is detected / detected. Upon detection of the initial signal, the UE is allowed to begin DL reception operations such as PDCCH monitoring. Therefore, the UE's power consumption can be reduced.

[0790] 3.1.1. Operation of the receiving side (Entity A)

[0791] 3.1.1.1. [Method #1-1A] Obtaining DL Tx Bursts Based on DL Signals

[0792] According to various embodiments of this disclosure, a specific DL signal can be defined as an initial signal. According to various embodiments of this disclosure, upon detecting an initial signal, the UE can identify the presence of a DL Tx burst. Alternatively, according to various embodiments of this disclosure, upon detecting a specific DL signal, the UE can identify the presence of a DL Tx burst.

[0793] For example, a specific DL signal can be at least all or part of the following signals.

[0794] - PSS and / or SSS and / or PBCH DM-RS: In an exemplary implementation, the PSS and / or SSS and / or PBCH DM-RS defined in the NR can be modified and repeated along the time axis and / or extended along the frequency axis. Therefore, tracking performance or transmission power can be increased.

[0795] -PDCCH DM-RS: In an exemplary implementation, a constraint may be imposed on the DM-RS to include only one symbol in order to minimize time axis occupancy.

[0796] --In an exemplary implementation, the DM-RS may be a standalone (PDCCH) DM-RS not linked to a specific CORESET. In this case, for example, the DM-RS may be configured to occupy a frequency band consisting of a specific number or more RBs (e.g., 50 RBs) considering the tracking performance and / or transmission power of the DM-RS. For example, transmission periodicity may be additionally configured (e.g., 7 symbols (7-symbol periodicity)).

[0797] --In an exemplary implementation, the DM-RS may be a (PDCCH) DM-RS linked to a specific CORESET. For example, in this case, the DM-RS may be configured to occupy a frequency band consisting of a specific number or more RBs (e.g., 50 RBs) considering the tracking performance and / or transmission power of the DM-RS, and may be transmitted in a specific REG or all REGs of the CORESET, regardless of PDCCH transmission. In another example, characteristically, the DM-RS may be a DM-RS corresponding to a CORESET where the precoder Granularity is set to allContiguousRBs. For example, when the precoder Granularity is set to allContiguousRBs in an NR system, the UE may assume that a DM-RS exists in each REG among the adjacent RBs of the REGs in the PDCCH candidates that include the mapped (or discovered) ones. On the other hand, for example, the UE may assume that a DM-RS exists in all (or some) REGs of the CORESET, regardless of the mapped (or discovered) PDCCH candidates.

[0798] --In an exemplary implementation, the BS may configure a specific PDCCH DM-RS as an initial signal for the UE. In another example, when the UE is configured with a PDCCH DM-RS associated with a CORESET that meets specific conditions, the UE may determine the PDCCH DM-RS as the initial signal. For example, a CORESET that meets specific conditions may be determined by parameters such as a specific CORESET index (e.g., the lowest or highest index greater than 0 among the CORESET indices configured for an active DLBWP) and / or pdcch-DMRS-ScramblingID (e.g., when set only by a function of cell-specific information such as cell ID) and / or precoderGranularity (e.g., when it is set to allContiguousRBs) and / or duration information (e.g., when it is set to 1 symbol duration) and / or frequencyDomainResources (e.g., when it indicates a predetermined number or more RBs). For example, a CORESET associated with CORESET index 0 and / or a CORESET associated with a DM-RS having pdcch-DMRS-ScramblingID configured solely through a function of cell-specific information can be a CORESET that meets specific conditions. For example, a PDCCH configured to be monitored in a set of search spaces associated with a CORESET that meets specific conditions can be defined / configured as an initial signal. For example, a PDCCH DM-RS in each set of search spaces (or search spaces, which may also apply to this sub-clause and various embodiments of this disclosure) associated with a CORESET can be configured as an initial signal. In another example, for a search space set associated with a CORESET that meets specific conditions (e.g., the index of a specific search space set with the lowest CORESET index configured for the active DL BWP and / or the monitoring timing interval of k or fewer slots / symbols and / or a specific aggregation level and / or CSS and / or a specific DCI format such as DCI format 2_0 and / or the configuration of the CORESET at a specific symbol location in a slot), the PDCCH DM-RS in the CORESET associated with the search space set can be configured as the initial signal. In another example, when configuring the PDCCH DM-RS in a CORESET associated with a search space set that meets specific conditions, the UE can determine the PDCCH DM-RS as the initial signal.For example, a search space set that meets specific conditions can be determined by parameters such as a specific search space set index (e.g., the lowest index or the lowest index greater than 0 among the search space set indices configured for the active DL BWP) and / or a monitoring timing interval (e.g., k or fewer slots / symbols) and / or an aggregation level (e.g., including specific aggregation levels such as AL=16) and / or a searchSpaceType (e.g., CSS type) and / or a specific DCI format (e.g., DCI format 2_0 / 1 / 2 / 3 and / or a DCI format indicating the COT structure) and / or a monitoring symbol index in the slot (e.g., symbol 0, symbol 7, etc.). In another example, when configuring the PDCCH DM-RS in a CORESET that meets specific conditions and is associated with a search space set that meets specific conditions, the UE can determine the PDCCH DM-RS as the initial signal.

[0799] -CSI-RS (Channel State Information-Reference Signal): In an exemplary implementation, the BS may configure a specific CSI-RS as an initial signal for the UE. In another example, the UE may determine the CSI-RS as the initial signal when a CSI-RS that meets specific conditions is configured. For example, a CSI-RS that meets specific conditions may be determined by configurations such as the intended use of the configuration (e.g., tracking and / or RRM measurement and / or CSI acquisition / obtaining and / or beam management) and / or frequency band (e.g., a specific number or more RBs) and / or monitoring timing interval (e.g., equal to or less than k time slots / symbols) and / or parameters involved in the sequence initialization signal (e.g., set only by a function of cell-specific parameters such as cell ID, and independent of UE-specific parameters).

[0800] According to various embodiments of this disclosure, when the UE detects an initial signal, the UE may at least consider a specific duration pointing to the DL to perform PDCCH monitoring and / or CSI-RS reception and / or DL-based semi-persistent scheduling (SPS) signal reception.

[0801] For example, a specific duration can be X symbols or time slots from the symbol of the initial signal that has been discovered (in the case of multiple symbols, the start or end symbol) and can be considered to point to DL.

[0802] For example, the value of X can be configured / indicated or predefined.

[0803] In another example, a specific duration can be the entire time slot that includes the symbol of the initial signal that has been discovered (in the case of multiple symbols, the start or end symbol) and the subsequent Y symbols or time slots (from the start / end symbol of the initial signal in the time slot to the end symbol of the time slot), and can be considered to point to DL.

[0804] For example, the value of Y can be configured / indicated or predefined.

[0805] According to various embodiments of this disclosure, different initial signal sequences and / or different initial signals can be defined based on information about X and / or Y.

[0806] For example, information about X and / or Y can be received by using different initial values ​​for a linear feedback shift register (LFSR) and / or different polynomials to generate m-sequences such as PSS / SSS.

[0807] In another example, X and / or Y can be used as parameters for sequence initialization of pseudo-random sequences such as DM-RS / CSI-RS.

[0808] In another example, X can be configured to be 1 (symbol or time slot) for a DM-RS linked to CORESET index 1 and 2 (symbol or time slot) for a DM-RS linked to CORESET index 2. That is, when a DM-RS linked to CORESET index 1 is detected (used) as the initial signal, X = 1 (symbol or time slot). When a DM-RS linked to CORESET index 2 is detected (used) as the initial signal, X = 2 (symbol or time slot). In other words, for example, when a DM-RS linked to CORESET index 1 is detected (used) as the initial signal, the specific duration is one symbol or time slot. When a DM-RS linked to CORESET index 2 is detected (used) as the initial signal, the specific duration is two symbols or time slots. Conversely, X can be configured to be 2 (symbol or time slot) for a DM-RS linked to CORESET index 1 and 1 (symbol or time slot) for a DM-RS linked to CORESET index 2.

[0809] In another example, the information transmitted in the initial signal (e.g., PSS / SSS and / or DM-RS / CSI-RS) may include information about the UL duration (e.g., offset and duration) and information about the DL duration.

[0810] 3.1.1.2. [Method #1-2A] Obtaining DL Tx Bursts Based on PDCCH

[0811] According to various embodiments of this disclosure, a specific PDCCH can be defined as an initial signal. For example, upon detecting an initial signal, the UE can recognize the presence of a DL Tx burst. In another example, upon detecting a specific PDCCH, the UE can recognize the presence of a DL Tx burst.

[0812] In an exemplary implementation, a specific PDCCH can be a PDCCH (PDCCH candidate) linked to a CORESET that meets specific conditions. For example, a CORESET that meets specific conditions can be determined by parameters such as a specific CORESET index (e.g., the lowest index or the lowest index greater than 0 among the CORESET indices configured for an active DLBWP) and / or pdcch-DMRS-ScramblingID (e.g., when it is set only by a function of cell-specific information such as cell ID) and / or precoderGranularity (e.g., when it is set to allContiguousRBs) and / or duration information (e.g., when it is set to 1 symbol duration) and / or frequencyDomainResources (e.g., when it indicates a predetermined number or more RBs). For example, a CORESET associated with CORESET index 0 and / or a CORESET associated with a DM-RS having a pdcch-DMRS-ScramblingID configured only by a function of cell-specific information can be a CORESET that meets specific conditions.

[0813] For example, a PDCCH configured to be monitored in a set of search spaces associated with a CORESET that meets specific conditions can be defined / configured as an initial signal. For example, a specific PDCCH in each set of search spaces linked to a CORESET can be configured as an initial signal.

[0814] In another example, for a set of search spaces associated with a CORESET that meets specific conditions (e.g., the index of a specific search space set that meets the minimum CORESET index configured for the active DL BWP and / or the monitoring timing interval of k or fewer slots / symbols and / or a specific aggregation level and / or CSS and / or the configuration of a CORESET such as a specific DCI format like DCI format 2_0 and / or a specific symbol position in a slot), a specific PDCCH in the CORESET associated with the search space set can be configured as the initial signal.

[0815] In another example, when a particular PDCCH (PDCCH candidate) is configured in a CORESET associated with a set of search spaces that meet certain conditions, the UE can identify that PDCCH as the initial signal.

[0816] For example, the set of search spaces that meets specific conditions can be determined by parameters such as the configuration of a specific search space set index (e.g., the lowest index or the lowest index greater than 0 in the search space set index configured for the active DL BWP) and / or the monitoring timing interval (e.g., k or fewer time slots / symbols) and / or the aggregation level (e.g., including specific aggregation levels such as AL=16) and / or the searchSpaceType (e.g., CSS type) and / or the specific DCI format (e.g., DCI format 2_0 / 1 / 2 / 3 and / or the DCI format indicating the COT structure) and / or the monitoring symbol index in the time slot (e.g., symbol 0, symbol 7, etc.).

[0817] In another example, when a specific PDCCH (PDCCH candidate) is configured in a CORESET that meets the specific conditions and is associated with a search space set that meets the specific conditions, the UE can determine the PDCCH as the initial signal.

[0818] According to various embodiments of this disclosure, when the UE transmits an initial signal, the UE may at least consider performing PDCCH monitoring and / or CSI-RS reception and / or DL-based SPS signal reception for a specific duration to be directed to the DL.

[0819] For example, a specific duration can be X symbols or time slots from the symbol of the initial signal that has been discovered (in the case of multiple symbols, the start or end symbol) and can be considered to point to DL.

[0820] For example, the value of X can be configured / indicated or predefined.

[0821] In another example, a specific duration can be the entire time slot that includes the symbol of the initial signal that has been discovered (or the start or end symbol in the case of multiple symbols) and the subsequent Y symbols or time slots (or from the start / end symbol of the initial signal in the time slot to the last symbol of the time slot), and can be considered to point to DL.

[0822] For example, the value of Y can be configured / indicated or predefined.

[0823] According to various embodiments of this disclosure, information about X and / or Y may be included in the initial signal. For example, information about X and / or Y may be indicated by a DCI payload in the initial signal (i.e., this information may be included in the DCI payload).

[0824] In another example, the information transmitted in the initial signal (e.g., PDCCH) may include information about the UL duration (e.g., offset and duration) and information about the DL duration.

[0825] When the PDCCH is defined as an initial signal or when a DL Tx burst is acquired via the PDCCH as described above, although the UE has detected the DM-RS associated with the PDCCH, the UE may fail to decode the PDCCH due to PDCCH CRC errors, etc. In this case, the UE can perform, for example, a DM-RS-based DL Tx burst reception operation as described in [Method #1-1A]. Alternatively, for example, considering that no DL Tx burst exists for the UE, the UE may attempt to detect the PDCCH defined as an initial signal (or used to acquire a DL Tx burst) at the next PDCCH monitoring opportunity.

[0826] In the above method, when multiple PDCCHs (PDCCH candidates) are defined as initial signals within a specific duration (e.g., one symbol or time slot or X / Y symbols or time slots) or when a DL Tx burst is obtained through multiple PDCCHs (PDCCH candidates), when at least one PDCCH is detected, at least the specific duration pointing to DL is considered, and the UE can perform PDCCH monitoring and / or CSI-RS reception and / or DL ​​SPS-based signal reception.

[0827] In an exemplary implementation, when the DL duration and / or UL duration are indicated to the UE using the above-described [Method #1-1A] and [Method #1-2A], the DL duration and / or UL duration can be interpreted differently depending on the signal and / or channel defined as the initial signal.

[0828] For example, when the CSI-RS used for tracking is detected as the initial signal, X = 1 (symbol or time slot); when the PDCCH is detected as the initial signal, X = 2 (symbol or time slot). That is, for example, when the CSI-RS used for tracking is detected as the initial signal, the DL duration and / or UL duration can be one symbol or time slot; when the PDCCH is detected as the initial signal, the DL duration and / or UL duration can be two symbols or time slots.

[0829] For example, different initial signals can be defined based on the time slot / symbol index. For example, an initial signal can be defined for even-numbered time slots according to [Method #1-1A], and for odd-numbered time slots according to [Method #1-2A].

[0830] In exemplary embodiments, when acquiring a DL Tx burst based on the DL signal and / or PDCCH as described in [Method #1-1A] and [Method #1-2A], different methods can be applied depending on whether it is within or outside the COT of the BS. That is, for example, different methods can be applied within and outside the COT of the BS. For example, the DL Tx burst can be acquired within the COT of the BS based on the exemplary embodiments described in [Method #1-1A]. For example, the DL Tx burst can be acquired outside the COT of the BS based on the exemplary embodiments described in [Method #1-2A].

[0831] For example, outside of the COT and / or in the first k slots of the COT (e.g., k=1 and the value of k can be predefined or indicated / configured for the UE via L1 signaling and / or higher-layer signaling), the UE can use a specific CORESET or search space set with specific PDCCH and / or DM-RS linked to the precoder Granularity set set to allContiguousRBs and / or frequencyDomainResources indicating a specific number or more RBs (e.g., 48 RBs for a 30-kHz SCS, 96 RBs for a 15-kHz SCS, where the SCS may be related to the unlicensed band for transmitting and receiving DL Tx bursts) to obtain DL Tx bursts and / or information about DL Tx bursts.

[0832] For example, the first k time slots of the COT can be the first k time slots within the COT. For example, k can be associated with the processing time at which the UE determines whether it is within or outside the COT and / or changes the operation accordingly. For example, the first k time slots corresponding to the COT may be within the COT, but considering the processing time, the UE may find it difficult to change the operation immediately. Therefore, according to an exemplary implementation, the UE can obtain the corresponding DL Tx burst and / or information about the DL Tx burst based on an operation similar to that outside the COT within the first k time slots of the COT.

[0833] For example, it may be desirable for reliable reception to design the corresponding signal / channel (e.g., DL signal and / or PDCCH) to occupy a significant amount of frequency axis resources.

[0834] On the other hand, for example, when considering the transmission of other DL signals / channels such as other PDCCHs, it may be desirable to design the signals / channels to utilize fewer frequency resources within the COT and / or after the first k time slots of the COT.

[0835] Therefore, for example, the UE can obtain DL Tx bursts and / or information about DL Tx bursts within the COT and / or after the first k slots of the COT using a specific PDCCH and / or DM-RS of a specific CORESET or search space set linked to the condition that "precoder Granularity is not set to all Contiguous RBs and / or does not meet the condition that frequencyDomainResources indicates a specific number or more RBs (e.g., 48 RBs for 30-kHz SCS, 96 RBs for 15-kHz SCS)".

[0836] More specifically, for example, suppose the COT information of the BS (e.g., time axis information and / or frequency axis information about the COT) can be transmitted in a DCI format scrambled using COT-RNTI. In this case, for example, the DCI format scrambled using COT-RNTI can be configured to be transmitted in a CORESET#X or a search space set #X linked to the CORESET, where the precoder Granularity is set to allContiguousRBs and the frequencyDomainResources indicate 48 RBs for the 30-kHz SCS. Furthermore, for example, the DCI format scrambled using COT-RNTI can be configured to be transmitted in a CORESET#Y or a search space set #Y linked to the CORESET, where the precoder Granularity is not set to allContiguousRBs and the frequencyDomainResources indicate 24 RBs for the 30-kHz SCS.

[0837] For example, outside of the COT and / or within the first k time slots of the COT, the BS may transmit a DCI format scrambled with COT-RNTI in CORESET#X or a search space set #X linked to the CORESET. Furthermore, for example, outside of the COT and / or after the first k time slots of the COT, the BS may transmit a DCI format scrambled with COT-RNTI in CORESET#Y or a search space set #Y linked to the CORESET. According to this exemplary implementation, resources available for transmitting PDCCHs other than the DCI format and / or PDSCHs within the COT can be effectively utilized.

[0838] 3.1.2. Operations on the sending side (Entity B)

[0839] 3.1.2.1. [Method #1-1B] Transmit DL Tx burst based on DL signal

[0840] According to various embodiments of this disclosure, a specific DL signal can be defined as an initial signal. According to various embodiments of this disclosure, the BS can indicate the presence of a DL Tx burst by sending the initial signal after the BS's CAP succeeds. In another example, the BS can indicate the presence of a DL Tx burst by sending a specific DL signal after the BS's CAP succeeds. For example, the specific DL signal can be all or some of the signals proposed in [Method #1-1A] according to various embodiments of this disclosure.

[0841] In an exemplary implementation, when the BS sends an initial signal, the BS may perform DL transmission for at least a certain duration.

[0842] For example, a specific duration can be X symbols or time slots from the symbol of the initial signal that has been discovered (in the case of multiple symbols, the start or end symbol) and can be considered to point to DL.

[0843] For example, the value of X can be configured / indicated by the BS for the UE or predefined.

[0844] In another example, a specific duration can be the entire time slot that includes the symbol of the initial signal that has been discovered (or the start or end symbol in the case of multiple symbols) and the subsequent Y symbols or time slots (or from the start / end symbol of the time slot to the last symbol of the time slot), and can be considered to point to DL.

[0845] For example, the value of Y can be configured / indicated by the BS for the UE or predefined.

[0846] According to various embodiments of this disclosure, different initial signal sequences and / or different initial signals can be defined based on information about X and / or Y.

[0847] For example, information about X and / or Y can be received by generating m-sequences such as PSS / SSS using different LFSR initial values ​​and / or different polynomials.

[0848] In another example, X and / or Y can be used as parameters for sequence initialization of pseudo-random sequences such as DM-RS / CSI-RS.

[0849] In another example, the information transmitted in the initial signal (e.g., PSS / SSS and / or DM-RS / CSI-RS) may include information about the UL duration (e.g., offset and duration) and information about the DL duration.

[0850] 3.1.2.2. [Method #1-2B] Sending DL Tx bursts based on PDCCH

[0851] According to various embodiments of this disclosure, a specific PDCCH can be defined as an initial signal. According to various embodiments of this disclosure, the BS can indicate the presence of a DL Tx burst by sending an initial signal after a CAP success. In another example, the BS can indicate the presence of a DL Tx burst by sending a specific PDCCH after a CAP success. For example, the specific DL signal can be at least part or all of the PDCCH (PDCCH candidate) proposed in the above-described [Methods #1-2A] according to various embodiments of this disclosure.

[0852] In an exemplary implementation, once the BS sends an initial signal, the BS can perform DL transmission for at least a certain duration.

[0853] For example, a specific duration can be X symbols or time slots from the symbol of the initial signal that has been discovered (in the case of multiple symbols, the start or end symbol) and can be considered to point to DL.

[0854] For example, the value of X can be configured / indicated by the BS for the UE or predefined.

[0855] In another example, a specific duration can be the entire time slot that includes the symbol of the initial signal that has been discovered (or the start or end symbol in the case of multiple symbols) and the subsequent Y symbols or time slots (or from the start / end symbol of the time slot to the last symbol of the time slot), and can be considered to point to DL.

[0856] For example, the value of Y can be configured / indicated by the BS for the UE or predefined.

[0857] According to various embodiments of this disclosure, information about X and / or Y may be included in the initial signal. For example, information about X and / or Y may be indicated by a DCI payload in the initial signal (i.e., this information may be included in the DCI payload).

[0858] In another example, the information transmitted in the initial signal (e.g., PDCCH) may include information about the UL duration (e.g., offset and duration) and information about the DL duration.

[0859] In exemplary embodiments, when acquiring a DL Tx burst based on the DL signal and / or PDCCH as described in [Method #1-1A] and [Method #1-2A], different methods can be applied depending on whether it is within or outside the COT of the BS. That is, for example, different methods can be applied within and outside the COT of the BS. For example, the DL Tx burst can be acquired within the COT of the BS based on the exemplary embodiments described in [Method #1-1A]. For example, the DL Tx burst can be acquired outside the COT of the BS based on the exemplary embodiments described in [Method #1-2A].

[0860] For example, outside of the COT and / or in the first k slots of the COT (k=1 and the value of k can be predefined or indicated / configured for the UE via L1 signaling and / or higher-layer signaling), the BS can use a specific PDCCH and / or DM-RS linked to a specific CORESET or search space set that indicates a specific number or more RBs (e.g., 48 RBs for a 30-kHz SCS, 96 RBs for a 15-kHz SCS, where the SCS may be associated with the unlicensed band for transmitting and receiving DL Tx bursts) to transmit information about DL Tx bursts.

[0861] For example, the first k time slots of the COT can be the first k time slots within the COT. For example, k can be associated with the processing time at which the UE determines whether it is within or outside the COT and / or changes the operation accordingly. For example, the first k time slots corresponding to the COT may be within the COT, but considering the processing time, the UE may find it difficult to change the operation immediately. Therefore, according to an exemplary implementation, the UE can obtain the corresponding DL Tx burst and / or information about the DL Tx burst based on an operation similar to that outside the COT within the first k time slots of the COT.

[0862] For example, it may be desirable for reliable reception to design the corresponding signal / channel (e.g., DL signal and / or PDCCH) to occupy a significant amount of frequency axis resources.

[0863] On the other hand, for example, when considering the transmission of other DL signals / channels such as other PDCCHs, it may be desirable to design the signals / channels to utilize fewer frequency resources within the COT and / or after the first k time slots of the COT.

[0864] Therefore, for example, within the COT and / or after the first k slots of the COT, a specific PDCCH and / or DM-RS (from the BS to the UE) linked to a specific CORESET or search space set may be used to send DL Tx bursts and / or information about DL Tx bursts. This is done within the COT and / or after the first k slots of the COT.

[0865] More specifically, for example, suppose the COT information of the BS (e.g., time axis information and / or frequency axis information about the COT) can be transmitted in a DCI format scrambled using COT-RNTI. In this case, for example, the DCI format scrambled using COT-RNTI can be configured to be transmitted in a CORESET#X or a search space set #X linked to the CORESET, where the precoder Granularity is set to allContiguousRBs and the frequencyDomainResources indicate 48 RBs for the 30-kHz SCS. Furthermore, for example, the DCI format scrambled using COT-RNTI can be configured to be transmitted in a CORESET#Y or a search space set #Y linked to the CORESET, where the precoder Granularity is not set to allContiguousRBs and the frequencyDomainResources indicate 24 RBs for the 30-kHz SCS.

[0866] For example, outside of the COT and / or within the first k time slots of the COT, the BS may transmit a DCI format scrambled with COT-RNTI in CORESET#X or a search space set #X linked to the CORESET. Furthermore, for example, outside of the COT and / or after the first k time slots of the COT, the BS may transmit a DCI format scrambled with COT-RNTI in CORESET#Y or a search space set #Y linked to the CORESET. According to this exemplary implementation, resources available for transmitting PDCCHs other than the DCI format and / or PDSCHs within the COT can be effectively utilized.

[0867] In [Method #1-1A], [Method #1-2A], [Method #1-1B], and [Method #1-2B] according to various embodiments of the present disclosure, the initial signal may include multiple symbols. That is, according to various embodiments of the present disclosure, the initial signal may be transmitted and received among multiple symbols.

[0868] For example, the initial signal can be repeated in each symbol.

[0869] For example, different initial signals can be defined for each symbol.

[0870] For example, the initial signal can be repeated and multiplexed in each symbol using time-axis orthogonal cover codes (OCC).

[0871] In various embodiments of the present disclosure, [Method #1-1A], [Method #1-2A], [Method #1-1B] and [Method #1-2B], multiple signals / channels may be defined as initial signals even during a specific duration (e.g., one symbol or time slot or X / Y symbols or time slots).

[0872] Alternatively, according to various embodiments of this disclosure, the UE can identify DL Tx bursts based on multiple signals / channels over a specific duration.

[0873] Alternatively, according to various embodiments of this disclosure, different signals / channels may be defined as initial signals during various specific durations (e.g., one symbol or time slot or X / Y symbols or time slots).

[0874] refer to Figure 22 Examples of various embodiments of this disclosure will be described in more detail below.

[0875] Figure 22 This is a diagram illustrating exemplary structures for transmitting and receiving initial signals according to various embodiments of the present disclosure.

[0876] Reference Figure 22 For example, the BS can configure an initial signal with half-slot periodicity for the first UE (UE1) and an initial signal with 1-slot periodicity for the second UE (UE2).

[0877] For example, it can be predefined or signaled that when an initial signal is detected in a specific time slot, the entire specific time slot can be used for DL.

[0878] For example, after a successful CAP, the BS can configure the COT to span 2.5 time slots from the middle of time slot #n+1 and send a DL Tx burst.

[0879] For example, when UE1 successfully detects the initial signal with half-slot periodicity in the middle of slot #n+1, UE1 may assume that at least that slot points to DL and perform DL reception.

[0880] Furthermore, for example, when UE2, which detects the initial signal in each time slot (with a time slot periodicity of 1), successfully detects the initial signal in time slot #n+2, UE2 may assume that at least that time slot points to DL and perform DL reception.

[0881] For example, even for a specific UE, different initial signals can be defined for each time slot and / or time slot group and / or symbol and / or symbol group.

[0882] For example, the PDCCH can be configured as the initial signal in the time slot for configuring the CSS. Similarly, the CSI-RS used for tracking can be configured as the initial signal in the time slot for configuring the USS.

[0883] Conversely, the CSI-RS used for tracking in the time slot configured for CSS can be configured as the initial signal. For example, the PDCCH can be configured as the initial signal in the time slot configured for USS.

[0884] In another example, for an initial access UE (i.e., a UE that has performed / is performing initial access), the PDCCH can be defined / configured as the initial signal, and then new signals / channels can be defined / configured as the initial signal as configured.

[0885] In another example, the CSI-RS used for tracking can be defined / configured as the initial signal for an RRC-connected UE, and the PSS / SSS and / or PDCCH can be defined / configured as the initial signal for other UEs (e.g., RRC inactive and / or RRC idle UEs).

[0886] Conversely, for example, PSS / SSS and / or PDCCH can be defined / configured as the initial signal for an RRC-connected UE, and CSI-RS for tracking can be defined / configured as the initial signal for other UEs (e.g., RRC inactive and / or RRC idle UEs).

[0887] In another example, the PDCCH DM-RS can be defined / configured as the initial signal for UEs operating only for DL ​​in unlicensed band NR cells, and the PDCCH (indicating DL / UL direction and / or COT structure) can be defined / configured as the initial signal for UEs operating for both DL and UL in unlicensed band NR cells.

[0888] 3.2. Methods for controlling the periodicity and / or time instances of PDCCH monitoring

[0889] Figure 27 This is a diagram illustrating exemplary methods for transmitting and receiving PDCCH according to various embodiments of the present disclosure.

[0890] Reference Figure 27 In operation 2701 according to an exemplary embodiment, the BS may perform DLCAP for an unlicensed frequency band to transmit DL signals / channels such as PDCCH to the UE. For example, the DL CAP may be one or more of the various DLCAPs described above for DL ​​transmission.

[0891] In operation 2703 according to an exemplary embodiment, when the BS determines from the DL CAP that the unlicensed band is available (or the channel configured in the unlicensed band is idle), the BS may send a PDCCH to the UE in the unlicensed band (or on the channel configured in the unlicensed band) based on the methods according to various embodiments of this disclosure.

[0892] For example, the PDCCH monitoring periodicity and / or time instance for the UE can be determined based on methods described later according to various embodiments of this disclosure. In operation 2705 according to an exemplary embodiment, the UE can monitor and / or decode the PDCCH received from the BS based on the determined PDCCH monitoring periodicity and / or time instance.

[0893] For example, the UE can send signals to and receive signals from the BS scheduled by the received PDCCH (e.g., DCI). For example, when the UE wants to send a specific signal to the BS, the UE can send the specific signal based on the result of the UL CAP. For example, the UL CAP can be one or more of the various UL CAPs described above used for UL transmission.

[0894] For example, in operation 2703 according to the exemplary embodiment described above, the BS may periodically send PDCCH to the UE considering the UE's PDCCH monitoring.

[0895] Now, a description of specific operations of a UE and / or BS based on various embodiments of the PDCCH transmission and reception methods according to this disclosure will be given.

[0896] For example, the timing of BS CAP success may not be predictable. Therefore, it may be advantageous in terms of effective channel occupancy to set the PDCCH monitoring periodicity and / or time instance interval to be very short.

[0897] Conversely, for example, setting a relatively long PDCCH monitoring period and / or time instance interval may be advantageous in terms of UE power consumption, since setting a short PDCCH monitoring period and / or time instance interval may result in higher power consumption for the UE.

[0898] In view of the above aspects, various embodiments of this disclosure may provide specific methods for controlling the periodicity and / or time instance interval of PDCCH monitoring.

[0899] In the following description of various embodiments of this disclosure within this subclause, the DL COT structure can be obtained via an initial signal as described in subclause 3.1. Alternatively, for example, the DL COT structure can be obtained via DCI format 2_0 and / or a separate DCI format.

[0900] 3.2.1. Operations of the Recipient (Entity A)

[0901] 3.2.1.1. [Method #2-1A] Control the PDCCH monitoring cycle and / or based on the length of the first time slot of DL COT. Methods for time instance intervals

[0902] For example, when the first slot of DL COT is too short, it can be very difficult, in terms of UE implementation (e.g., in terms of UE processing time), to control the periodicity and / or time instance interval of PDCCH monitoring that starts immediately in subsequent slots (or after K slots).

[0903] In this regard, according to various embodiments of this disclosure, for example, when the length of the first time slot of DL COT is equal to or less than or less than N symbols (e.g., N=3), the UE may periodically perform PDCCH monitoring (PDCCH monitoring) outside of DL COT in the time slot to the next time slot (immediately following the time slot) (and / or the following K time slots).

[0904] Conversely, according to various embodiments of this disclosure, for example, when the length of the first time slot of the DL COT is equal to or greater than N symbols (e.g., N = 3), the UE may periodically perform PDCCH monitoring only in that time slot (and / or the time slot to the (immediately) K-1 time slots) for applications outside the DL COT (PDCCH monitoring). For example, the UE may begin in the next time slot (and / or the subsequent K time slots) to be configured for periodic PDCCH monitoring within the DL COT (PDCCH monitoring).

[0905] For example, starting in the first time slot after the corresponding time slot (e.g., from the beginning and / or boundary of the first time slot), the UE may switch to PDCCH monitoring with periodicity configured for DL ​​COT (PDCCH monitoring).

[0906] For example, N can be set to a value greater than the processing time of the UE handover PDCCH monitoring operation. For example, N (number of symbols) can be set to a value equal to or greater than the time spent by the UE handover PDCCH monitoring operation.

[0907] In an exemplary implementation, it is assumed that multiple PDCCH monitoring opportunities (and / or CORESET) are configured in the search space set within a specific time slot.

[0908] For example, in the time slot of symbol 1 CORESET, 0&4&7&11 are set as monitoring symbols (i.e., symbols #0, #4, #7, and #11 are configured as monitoring symbols), and in the time slot of symbol 2 CORESET, 0 / 1&4 / 5&7 / 8&11 / 12 are set as monitoring symbols (i.e., symbols #0 / 1, #4 / 5, #7 / 8, and #11 / 12 are configured as monitoring symbols).

[0909] According to various embodiments of this disclosure, based on this assumption, when the length of the first time slot of the discovered DL COT is equal to or less than (or less than) 3 symbols, the UE can perform PDCCH reception in multiple PDCCH monitoring opportunities (and / or CORESETs) with a configured periodicity (e.g., the monitoring symbol periodicity in the aforementioned 1-symbol / 2-symbol CORESET). According to various embodiments of this disclosure, starting in the next time slot, the UE can perform PDCCH reception only in the earliest symbol region (and / or CORESET) among the multiple PDCCH monitoring opportunities (and / or CORESETs) in the time slot. For example, PDCCH can be received only in the earliest symbol #0 of the monitoring symbols in the time slot of the 1-symbol CORESET and only in the earliest symbol #0 / 1 of the monitoring symbols in the time slot of the 2-symbol CORESET. Therefore, the number of PDCCH opportunities can be reduced.

[0910] Conversely, according to various embodiments of this disclosure, based on this assumption, when the length of the first time slot of the discovered DL COT is greater than (or equal to or greater than) 3 symbols, the UE may perform PDCCH reception in multiple PDCCH monitoring opportunities (and / or CORESETs) or even periodically within that time slot and only for that time slot. According to various embodiments of this disclosure, starting from the next time slot, the UE may perform PDCCH reception only in the earliest symbol region (and / or CORESET) among the multiple PDCCH monitoring opportunities (and / or CORESETs) in the time slot.

[0911] For a 1-symbol CORESET, for example, when the length of the first time slot of the discovered DL COT is equal to or less than 3 symbols, the UE can monitor the PDCCH based on the monitoring symbols 0, 4, 7, and 11 from the corresponding time slot to the next time slot, and receive the PDCCH based on the monitoring symbol 0 in the time slots following the next time slot. Conversely, when the length of the first time slot of the discovered DL COT is greater than 3 symbols, the UE can monitor the PDCCH based only on the monitoring symbols 0, 4, 7, and 11 in the corresponding time slot, and receive the PDCCH based on the monitoring symbol 0 in the time slots following that time slot.

[0912] For a 2-symbol CORESET, for example, when the length of the first time slot of the discovered DL COT is equal to or less than 3 symbols, the UE can monitor the PDCCH based on the monitoring symbols 0 / 1, 4 / 5, 7 / 8, 11 / 12 from the corresponding time slot to the next time slot, and receive the PDCCH based on the monitoring symbol 0 / 1 in the time slots after the next time slot. Conversely, when the length of the first time slot of the discovered DL COT is greater than 3 symbols, the UE can only monitor the PDCCH based on the monitoring symbols 0 / 1, 4 / 5, 7 / 8, 11 / 12 in the corresponding time slot, and receive the PDCCH based on the monitoring symbol 0 / 1 in the time slots after that time slot.

[0913] For example, when different periodic monitoring times are configured for multiple search space sets, the various embodiments described above in this disclosure can be applied to a specific search space set.

[0914] For example, the various embodiments described above in this disclosure can be applied to all search space sets in which PDCCH monitoring timing is configured at intervals (e.g., one time slot) less than a specific threshold.

[0915] For example, suppose PDCCH monitoring is configured at intervals of 2 time slots in search space set #0, at intervals of 2 symbols in search space set #1, and at intervals of 7 symbols in search space set #2. That is, in this example, PDCCH monitoring is configured at intervals larger than a certain threshold in search space set #0, and at intervals smaller than a certain threshold in search space sets #1 / 2.

[0916] In this scenario, the UE can perform PDCCH monitoring at configured intervals only in some initial slots of DL COT within each search space set #0 / 1 / 2. In slots following the corresponding slot, PDCCH monitoring is performed at one-slot intervals in search space set #1 / 2, specifically in the earliest symbol of each slot (i.e., the CORESET duration) (while in search space set #0, PDCCH monitoring can still be performed at two-slot intervals).

[0917] 3.2.1.2. [Method #2-2A] Method for controlling the periodicity and / or time instance interval of PDCCH monitoring

[0918] According to various embodiments of this disclosure, the PDCCH monitoring periodicity and / or time instance interval can be explicitly controlled via UE-specific DCI and / or cell-specific DCI (e.g., explicit signaling). According to various embodiments of this disclosure, the PDCCH monitoring periodicity and / or time instance interval can be implicitly controlled after the detection of a predetermined signal (e.g., DL burst, DM-RS, GC-PDCCH, and / or PDCCH) and / or based on information about the COT structure.

[0919] For example, multiple PDCCH monitoring intervals can be configured for a specific search space set, and a signal can be used to indicate which PDCCH monitoring interval to use. For example, when the PDCCH monitoring interval is notified by signal via UE-specific DCI and / or cell-specific DCI, the UE-specific DCI and / or cell-specific DCI may include information about the PDCCH monitoring interval.

[0920] In another example, the search space set can be divided into two or more groups, and the groups that include the search space sets to be used for PDCCH monitoring can be signaled. For example, each group may include one or more search space sets (a search space set may belong to two or more groups), and the UE can be signaled which group is used for PDCCH monitoring. For example, when a group is signaled via UE-specific DCI and / or cell-specific DCI, the UE-specific DCI and / or cell-specific DCI may include information about the group. For example, different PDCCH monitoring periodicities and / or time instance intervals can be configured to be applied to each group.

[0921] In terms of UE implementation, it may be difficult for the UE to change its monitoring behavior immediately after receiving explicit signaling (i.e., change the monitoring behavior as soon as explicit signaling is received). In this regard, according to various embodiments of this disclosure, the UE may perform PDCCH reception at the indicated PDCCH monitoring interval Z symbols after receiving the explicit signal (or from the HARQ-ACK feedback (to explicit signaling)).

[0922] For example, suppose that PDCCH monitoring is configured in search space set #0 with an interval of 2 slots (type A) or 4 slots (type B), in search space set #1 with an interval of 2 symbols (type A) or 1 slot (type B), and in search space set #2 with an interval of 7 symbols (type A) or 1 slot (type B).

[0923] Based on the above assumptions, for example, the BS can use UE-specific DCI and / or cell-specific DCI to signal type A / type B as PDCCH monitoring periodicity. For example, the UE can apply a changed monitoring periodicity Z symbols after receiving the UE-specific DCI and / or cell-specific DCI.

[0924] In another example, suppose that PDCCH monitoring is configured at intervals of 2 time slots in search space set #0, at intervals of 2 symbols in search space set #1, and at intervals of 7 symbols in search space set #2.

[0925] Based on the above assumptions, for example, search space set #0 can be assigned to group A (or group #0), and search space sets #1 / 2 can be assigned to group B (or group #1). This configuration can be based on higher-layer signaling. For example, the UE can receive information indicating the group to which each search space set belongs, such as information indicating that search space set #0 belongs to group A, search space set #1 belongs to group B, and search space set #2 belongs to group B.

[0926] For example, the BS can signal the activation of which group A and group B (and / or which search space set associated with the group) and / or which search space set via UE-specific DCI and / or cell-specific DCI. For example, the UE can perform PDCCH monitoring in each active search space set (e.g., in each search space set included in the active group) Z symbols after receiving the UE-specific DCI and / or cell-specific DCI.

[0927] That is, for example, the BS can indicate at the group level which group A and group B is active via UE-specific DCI and / or cell-specific DCI.

[0928] In another example, the BS can indicate which of Group A and Group B the enabled search space set belongs to via UE-specific DCI and / or cell-specific DCI. In this case, the BS can also indicate which search space set is included in the group.

[0929] The methods described above according to various embodiments of this disclosure can be applied in the same manner as methods for controlling PDCCH monitoring periodicity and / or time instances based on the COT structure. In an exemplary embodiment, the UE can identify the COT structure by determining, according to various embodiments of this disclosure in sub-clause 3.1, whether the initial signal is included in the DL Tx burst (e.g., based on information related to the length of the DL Tx burst included in the initial signal, and / or when the initial signal is detected, the DL Tx burst is determined to span a predetermined length) or DCI format 2_0 (e.g., transmitted on GC-PDCCH) and / or a separate DCI format indicating the COT structure (e.g., transmitted on PDCCH and / or GC-PDCCH).

[0930] Alternatively, in an exemplary embodiment, the PDCCH monitoring periodicity and / or time instance interval can be implicitly controlled based on information about the COT structure after a predetermined signal (e.g., DL burst, DM-RS, GC-PDCCH, and / or PDCCH) is detected.

[0931] For example, suppose that PDCCH monitoring is configured in search space set #0 with an interval of 2 slots (type A) or 4 slots (type B), in search space set #1 with an interval of 2 symbols (type A) or 1 slot (type B), and in search space set #2 with an interval of 7 symbols (type A) or 1 slot (type B).

[0932] Based on this assumption, for example, type B can be applied before the discovery of COT (and / or in some initial time slots of DL COT), and type A can be applied within COT (and / or in time slots after the initial time slot of DL COT).

[0933] In another example, suppose that PDCCH monitoring is configured at intervals of 2 time slots in search space set #0, at intervals of 2 symbols in search space set #1, and at intervals of 7 symbols in search space set #2.

[0934] Based on this assumption, for example, search space set #0 can be configured as group A, and search space set #1 / 2 can be configured as group B. For example, group B can be applied before the discovery of COT (and / or in some initial time slots of DL COT), and group A can be applied within COT (and / or in time slots after the initial time slot of DL COT).

[0935] Alternatively, for example, it may be understood that group A is applied within the COT and group B is applied outside the COT (e.g., before the COT is discovered and / or after the COT ends).

[0936] Alternatively, for example, when identifying a COT structure via an initial signal according to various embodiments of this disclosure, a specific duration including X symbols or time slots after the initial signal is detected can be determined to point to DL, as previously described in sub-clause 3.1. Therefore, it is understood that group A is applied within the specific duration including X symbols or time slots, and group B is applied outside the specific duration.

[0937] <Search Space Set Switching Method - Implementation Method 1>

[0938] Embodiment 1, which describes various embodiments of the present disclosure, relates to the switching of the search space set according to the method of controlling the periodicity and / or time instance interval of PDCCH monitoring.

[0939] For example, switching between groups can be equivalent to changing the group performing PDCCH monitoring.

[0940] For example, after one or more predetermined conditions are met, a UE performing PDCCH monitoring in group B can start PDCCH monitoring in group A and end PDCCH monitoring in group B.

[0941] For example, this aspect of the UE implementation can also be considered as previously described in [Method #2-1A] and / or [Method #2-1B]. For example, N symbols after one or more predetermined conditions are met, a UE performing PDCCH monitoring in group B can start PDCCH monitoring in group A and end PDCCH monitoring in group B. For example, in the first time slot after N symbols (e.g., the start and / or boundary of the first time slot), the UE can start PDCCH monitoring in group A and end PDCCH monitoring in group B, thereby switching PDCCH monitoring operations.

[0942] For example, N can be set to a value greater than the processing time of a UE handover PDCCH monitoring operation (e.g., a search space set handover corresponding to starting PDCCH monitoring in group A and ending PDCCH monitoring in group B). For example, N can be set to be equal to or greater than the time spent by the UE handover PDCCH monitoring operation.

[0943] For example, the UE may be provided with two or more sets of search spaces for PDCCH (e.g., via higher-layer signaling such as RRC signaling). For example, the UE may be provided with group indexes for the various search space sets configured for PDCCH monitoring.

[0944] For example, a UE can be configured to switch between groups (e.g., via higher-level signaling such as RRC signaling).

[0945] For example, switching between groups can be indicated by at least one of the following options (in other words, switching between groups can be performed when one or more predetermined conditions are met).

[0946] - Option 1: Implicit indication. For example, implicitly indicating the switching between groups after the detection of a predetermined signal (e.g., DL burst, wideband (WB) DM-RS, GC-PDCCH and / or PDCCH) and / or based on information about the COT structure.

[0947] - Option 2: Explicit indication. For example, explicitly indicate the switching between groups based on GC-PDCCH and / or PDCCH.

[0948] For example, a UE can always monitor a set of search spaces outside of a configured group (e.g., a set of CSS), regardless of the search space set indication.

[0949] For example, a single search space set can be a member of one or more (e.g., two or more) groups. That is, a single search space set can belong to only one group or two or more groups.

[0950] <Search Space Set Switching Method - Implementation Method 2>

[0951] Embodiment 2, which describes various embodiments of the present disclosure, relates to the switching of the search space set based on the method of controlling the periodicity and / or time instance interval of PDCCH monitoring.

[0952] For example, a group index of each configured search space set can be provided to the UE via a higher-level parameter (e.g., searchSpaceGroupIdList-r16) for PDCCH monitoring in the serving cell indicated by the higher-level parameter (e.g., searchSpaceSwitchingGroup-r16).

[0953] For example, when the UE is not provided with higher-layer parameters for the search space set (e.g., searchSpaceGroupIdList-r16) and / or higher-layer parameters for PDCCH monitoring in the serving cell (e.g., searchSpaceSwitchingGroup-r16), the operations described below according to various embodiments of this disclosure may not be applied to PDCCH monitoring in the search space set.

[0954] For example, a timer value can be provided to the UE via a higher-level parameter (e.g., searchSpaceSwitchingTimer-r16). For instance, the UE can decrement the timer value by one after monitoring the PDCCH to detect each slot within the active DL BWP of the serving cell in DCI format 2_0.

[0955] For example, when the UE is provided with higher-level parameters (e.g., SearchSpaceSwitchTrigger-r16) indicating the location of the search space set switching field in DCI format 2_0 for the serving cell and detects DCI format 2_0 in a time slot, the UE can operate as follows.

[0956] - For example, if the UE does not monitor PDCCH in the search space set with group index 0 and the value of the search space set field is 0, the UE may start PDCCH monitoring in the search space set with group index 0 in the serving cell in the first time slot after at least P1 symbols from the corresponding time slot in the active DL BWP of the serving cell, and stop PDCCH monitoring in the search space set with group index 1.

[0957] - For example, if the UE does not perform PDCCH monitoring in the search space set with group index 1 and the value of the search space set field is 1, the UE may start PDCCH monitoring in the search space set with group index 1 in the serving cell in the first time slot after at least P1 symbols from the corresponding time slot in the active DL BWP of the serving cell, stop PDCCH monitoring in the search space set with group index 0, and set the timer value to the value provided by the higher layer parameter (e.g., searchSpaceSwitchingTimer-r16).

[0958] - For example, if the UE performs PDCCH monitoring in the search space set with group index 1, the UE may start PDCCH monitoring in the search space set with group index 0 in the serving cell at the beginning of the first time slot after at least P1 symbols from the time slot when the timer expires and / or the last time slot of the remaining channel occupancy duration of the serving cell indicated by DCI format 2_0, and stop PDCCH monitoring in the search space set with group index 1.

[0959] For example, if no higher-level parameters (e.g., SearchSpaceSwitchTrigger-r16) are provided to the UE, the UE will operate as follows.

[0960] - For example, when the UE detects the DCI format by PDCCH monitoring in a search space set with group index 0 in a time slot, and when the UE detects the DCI format by PDCCH monitoring in any search space set, in the first time slot at least P2 symbols after the corresponding time slot in the active DL BWP of the serving cell, the UE may start PDCCH monitoring in the search space set with group index 1 in the serving cell and stop PDCCH monitoring in the search space set with group index 0.

[0961] - For example, when the UE performs PDCCH monitoring in the search space set with group index 1, and after the timer expires and / or when the search space set for PDCCH monitoring is provided to the UE to detect DCI, the UE may start PDCCH monitoring in the search space set with group index 0 and stop PDCCH monitoring in the search space set with group index 1 at the beginning of the first time slot after the last time slot of the remaining channel occupancy duration of the serving cell indicated by DCI format 2_0.

[0962] For example, as previously described in [Method #2-1A] and / or [Method #2-1B], this aspect of the UE implementation can also be considered for P1 / P2. For example, P1 / P2 can be set to a value greater than the processing time of the UE switching PDCCH monitoring operations (e.g., switching the search space set corresponding to the start of PDCCH monitoring for the group with group index #0 / 1 and the end of PDCCH monitoring for the group with group index #1 / 0).

[0963] 3.2.2. Operations on the sending side (Entity B)

[0964] 3.2.2.1. [Method #2-1B] Control the PDCCH monitoring cycle and / or according to the length of the first time slot in DL COT. Methods for time instance intervals

[0965] For example, when the first slot of DL COT is too short, it can be very difficult in BS implementations to control the periodicity and / or time instance interval of PDCCH monitoring that starts immediately in subsequent slots (or after K slots).

[0966] In this regard, according to various embodiments of this disclosure, for example, when the length of the first time slot of DL COT is equal to or less than or less than N symbols (e.g., N=3), BS may periodically transmit PDCCH for applications other than DL COT (PDCCH monitoring) in the time slot to the next time slot (immediately following the time slot) (and / or the following K time slots).

[0967] Conversely, according to various embodiments of this disclosure, for example, when the length of the first time slot of the DL COT is equal to or greater than N symbols (e.g., N = 3), the BS may periodically transmit PDCCH for applications outside the DL COT (PDCCH monitoring) only in that time slot (and / or that time slot to the (immediately) subsequent K-1 time slots). For example, the UE may begin periodically performing PDCCH monitoring for applications within the DL COT in the next time slot (and / or K subsequent time slots) of the corresponding time slot.

[0968] For example, when different periodic monitoring times are configured for multiple search space sets, the various embodiments described above in this disclosure can be applied to a specific search space set.

[0969] For example, the various embodiments described above in this disclosure can be applied to all search space sets in which PDCCH monitoring timing is configured at intervals (e.g., one time slot) less than a specific threshold.

[0970] 3.2.2.2. [Method #2-2B] Method for controlling the periodicity and / or time instance interval of PDCCH monitoring

[0971] According to various embodiments of this disclosure, the PDCCH monitoring periodicity and / or time instance interval can be explicitly controlled via UE-specific DCI and / or cell-specific DCI (e.g., explicit signaling). According to various embodiments of this disclosure, the PDCCH monitoring periodicity and / or time instance interval can be implicitly controlled after the detection of a predetermined signal (e.g., DL burst, DM-RS, GC-PDCCH, and / or PDCCH) and / or based on information about the COT structure.

[0972] For example, multiple PDCCH monitoring intervals can be configured for a specific search space set, and a signal can be used to indicate which PDCCH monitoring interval to use. For example, when the PDCCH monitoring interval is notified by signal via UE-specific DCI and / or cell-specific DCI, the UE-specific DCI and / or cell-specific DCI may include information about the PDCCH monitoring interval.

[0973] In another example, the search space set can be divided into two or more groups, and the groups that include the search space sets to be used for PDCCH monitoring can be signaled. For example, each group may include one or more search space sets (a search space set may belong to two or more groups), and the UE can be signaled which group is used for PDCCH monitoring. For example, when a group is signaled via UE-specific DCI and / or cell-specific DCI, the UE-specific DCI and / or cell-specific DCI may include information about the group. For example, different PDCCH monitoring periodicities and / or time instance intervals can be configured to be applied to each group.

[0974] Methods for altering the periodicity and / or time instance of PDCCH monitoring according to various embodiments of this disclosure (e.g., [method #2-1A], [method #2-2A], [method #2-1B], and [method #2-2B]) can be applied to both self-carrier scheduling (SCS) and cross-carrier scheduling (CCS).

[0975] refer to Figure 24 , Figure 25 and Figure 26 Examples are provided to describe various embodiments of this disclosure in more detail.

[0976] Figure 24 , Figure 25 and Figure 26 This is a diagram illustrating the PDCCH transmission and reception structure according to various embodiments of the present disclosure.

[0977] In an NR system, for example, a PDCCH monitoring opportunity in a search space set configured for a scheduled cell (and / or an active BWP in the cell, which may be replaced by the BWP and / or active BWP and / or channel and / or CAP subband in the description of this sub-clause and various embodiments of this disclosure) is linked to a search space set configured for a scheduled cell having the same index as the search space set, and PDCCH monitoring is performed during the PDCCH monitoring opportunity.

[0978] Reference Figure 24 For example, when the scheduling cell of cell 2 is configured as cell 1, the DCI format linked to the search space set ID#0 of cell 2 can be monitored during the PDCCH monitoring timing configured in the search space set ID#0 of cell 1. In the description of this sub-clause and various embodiments of this disclosure, the expression search space set ID#X can be understood as being the same as search space set #X.

[0979] For example, Cell 2 can operate on unlicensed spectrum or shared spectrum.

[0980] For example, suppose that PDCCH monitoring is configured in the search space set ID#0 of cell 2 with intervals of 2 symbols (type A) or 1 time slot (type B).

[0981] Based on this assumption, for example, it is possible to configure type B to be applied before the discovery of COT (and / or in some initial time slots of DL COT), and type A to be applied within COT (and / or in time slots after the initial time slot of DL COT).

[0982] In this paper, for example, when cell 1 is configured as the scheduling cell for cell 2, it can be specified that DCI monitoring linked to search space set ID#0 of cell 2 is performed twice per time slot according to the configuration of search space set ID#0 of cell 1 before COT is discovered in cell 2 (and / or in some initial time slots of DL COT), and once per time slot according to the configuration of search space set ID#0 of cell 2 within COT (and / or in time slots after the initial time slot of DL COT) (or in more sparse PDCCH monitoring time instances between the configuration of search space set ID#0 of cell 1 and the configuration of search space set ID#0 of cell 2).

[0983] In another example, suppose group B is set for search space set ID#0 configured for cell 2.

[0984] Based on this assumption, for example, it can be configured that only the search space set corresponding to group B is valid before the discovery of COT (and / or in some initial time slots of DL COT), and only the search space set corresponding to group A is valid within COT (and / or in time slots after the initial time slot of DL COT) (i.e., the search space set corresponding to group B is invalid).

[0985] In this paper, for example, the DCI of cell 2 can be monitored in the search space set ID#0 configured in cell 1 before the COT of cell 2 is discovered (and / or in some starting time slots of the DL COT), and the DCI of cell 2 can be monitored in the search space set ID#0 configured in cell 1 outside of the COT (and / or in time slots after the starting time slot of the DL COT).

[0986] <Implementation Method 1>

[0987] Reference Figure 25 For example, it can be found in such Figure 25 The PDCCH monitoring timing is configured in the search space sets #0 / 1 / 2 shown. For example, search space set #1 can be set as group A, and search space set #2 can be set as group B.

[0988] For example, suppose that the CORESET and / or PDCCH DM-RS linked to search space set #0 are defined / configured as initial signals and / or signals transmitted from the serving cell by the UE.

[0989] Based on this assumption, for example, the UE can perform PDCCH monitoring twice per time slot according to the configuration of search space set #0.

[0990] For example, when a UE discovers a PDCCH and / or a PDCCH DM-RS in search space set #0 in time slot #n+1 and obtains information from the PDCCH and / or another PDCCH indicating that time slot #n+3 is a DL time slot, when performing PDCCH monitoring for search space set #0, the UE can perform PDCCH monitoring once per time slot from time slot #n+2 (the earliest duration among the PDCCH monitoring opportunities allocated to the time slot).

[0991] For example, a UE that identifies a DL time slot between time slot #n+1 and time slot #n+3 can perform PDCCH monitoring during the first DL time slot (i.e., time slot #n+1) in the PDCCH monitoring timing configured in search space set #2 and during the subsequent DL time slots (i.e., time slot #n+2 / 3) in the PDCCH monitoring timing configured in search space set #1.

[0992] For example, when the UE discovers the PDCCH and / or PDCCH DM-RS in search space set #0 in time slot #n+1 and obtains information from the PDCCH and / or another PDCCH indicating that the time slot of time slot #n+3 is a DL time slot, the UE may not perform the configured PDCCH monitoring in search space set #0 in time slot #n+1 before discovering the PDCCH and / or PDCCH DM-RS and / or in search space set #1 and / or search space set #2 after time slot #n+3.

[0993] <Implementation Method 2>

[0994] According to various embodiments of this disclosure, when the UE performs PDCCH monitoring, different PDCCH monitoring time patterns can be configured for each stage as follows.

[0995] - Phase A: The period after Phase C when no DL burst is detected (e.g., in the methods of various embodiments of this disclosure) and / or after the detection of a DL burst.

[0996] Phase B: In the event of a DL burst (e.g., in methods according to various embodiments of this disclosure), PDCCH monitoring timing includes the initial k time slots of the DL burst. Herein, k may be preset to a specific value (e.g., k = 1) or configured via higher-layer signaling such as RRC / MAC signaling.

[0997] - Phase C: In the event of a DL burst (e.g., in methods according to various embodiments of this disclosure), the PDCCH monitoring timing is not included in the initial k time slots of the DL burst. Herein, k may be preset to a specific value (e.g., k = 1) or configured via higher-layer signaling such as RRC / MAC signaling.

[0998] For example, switching between phases can be signaled via at least one of the following options.

[0999] Option 1: Explicitly signal via a specific DCI

[1000] Option 2: Implicitly notify via signal the information indicating the time axis channel occupancy of the BS in the DCI.

[1001] For example, in Option 1, the BS may use a specific field in the DCI (e.g., a new field indicating the phase) and / or at least some state of an existing field in the DCI to indicate to the UE whether the slot carrying the DCI (and / or the following n slots) belongs to Phase B / Phase C.

[1002] For example, in Option 2, when the UE identifies the corresponding time slot as belonging to the duration of Phase B from the DCI occupied by the time axis channel indicating the BS, the UE can perform PDCCH monitoring corresponding to Phase B in that time slot. Similarly, in Option 2, when the UE identifies the corresponding time slot as belonging to the period of Phase C from the DCI occupied by the time axis channel indicating the BS, the UE can perform PDCCH monitoring corresponding to Phase C in that time slot.

[1003] In an exemplary implementation, considering that the UE triggers new PDCCH monitoring behaviors during various handovers between phases, the time delay caused by the UE's processing time can be taken into account.

[1004] For example, suppose that switching from stage A to stage B requires a time delay of X symbols.

[1005] Based on this assumption, for example, it can be stipulated that when the UE recognizes that phase B starts from symbol #Y, it starts from symbol #(X+Y) and actually applies the PDCCH monitoring behavior corresponding to phase B.

[1006] For example, X can be a UE capability value. For example, X can be set to different values ​​depending on the UE capability.

[1007] For example, the UE can report UE capability values ​​(e.g., information about UE capabilities) to the BS, and the BS can configure X values ​​for the UE based on the reported capability values ​​via higher-level signaling such as RRC signaling.

[1008] For example, a monitoring time pattern for each stage can be defined for each search space (and / or CORESET and / or DCI format and / or RNTI).

[1009] For example, the monitoring time pattern may include all or some of the following parameters.

[1010] -monitoringSlotPeriodicityAndOffset: This parameter relates to information about the PDCCH monitoring slots configured by periodicity and offset. For example, if the parameter value is sl1, the UE can monitor the search space in individual slots. For example, if the parameter value is sl4, the UE can monitor the search space every four slots.

[1011] -monitoringSymbolsWithinSlot: This parameter relates to information about the first symbol in the time slot configured for PDCCH monitoring. For example, if the parameter value is 10000000000000, the UE can begin searching in the first symbol of the time slot. For example, if the parameter value is 01000000000000, the UE can begin searching in the second symbol of the time slot.

[1012] In another example, different numbers of per-AL PDCCH blind decoding (BD) candidates and / or different search space types and / or different DCI formats can be configured for each search space.

[1013] Reference Figure 26 The temporal pattern configurations for each search space set can be given as follows.

[1014] - Search Space Collection #0

[1015] --Phase A / B: PDCCH monitoring in each time slot, CORESET duration begins in symbol #0 / 4 / 7 / 11

[1016] --Phase C: PDCCH monitoring in each time slot, CORESET duration begins in symbol #0.

[1017] - Search Space Collection #1

[1018] --Phase A / B: Monitoring off. That is, monitoring can be disabled.

[1019] --Phase C: PDCCH monitoring in each time slot, CORESET duration begins in symbol #0.

[1020] - Search Space Collection #2

[1021] --Phase A / B: Monitoring off. That is, monitoring can be disabled.

[1022] --Phase C: PDCCH monitoring in each time slot, CORESET duration begins in symbol #0 / 4 / 7 / 11

[1023] 3.3. Cross-Carrier Scheduling (CCS) Method

[1024] Figure 28 This is a diagram illustrating exemplary scheduling methods according to various embodiments of the present disclosure.

[1025] Reference Figure 28 In operation 2801 according to the exemplary implementation, the BS may perform DL CAP for multiple cells (e.g., cells included in a particular cell group) to send scheduling information to the UE. For example, the DL CAP for the multiple cells may be one or more of the various DL CAPs described above for DL ​​transmission.

[1026] In operation 2803 according to an exemplary implementation, the BS may send scheduling information for one or more cells to the UE based on the result of DL CAP.

[1027] For example, when the BS successfully performs DL CAP on only some of the cells, the BS may send scheduling information for one or more of the multiple cells (i.e., one or more of the multiple cells) on one or more of the cells. For example, in Case 1, which will be described later, the BS may send scheduling information for the corresponding cell (and / or one or more cells where DL CAP failed) on the specific cell (where DL CAP was successful).

[1028] In another example, when the BS successfully performs DL CAP for all multiple cells, the BS may send scheduling information for one or more of the multiple cells to the UE on one or more of the multiple cells. For example, as in Case 2, which will be described later, the BS may send scheduling information for each cell to the UE (SCS) on a cell or send scheduling information for the corresponding cell (and one or more other cells besides the corresponding cell) on a specific one of the multiple cells.

[1029] In operation 2805 according to the exemplary implementation, the UE may perform signal transmission / reception scheduled for one or more cells based on scheduling information (e.g., DCI) received from the BS for one or more cells. For example, when the UE wants to transmit a specific signal to the BS on a specific cell (and / or multiple cells including the specific cell), the UE may transmit the signal to the BS based on the result of the UL CAP of the specific cell (and / or multiple cells including the specific cell). For example, the UL CAP of the specific cell (and / or multiple cells including the specific cell) may be one or more of the aforementioned UL CAPs used for UL transmission.

[1030] Now, specific operations of the UE and / or BS in the scheduling method according to various embodiments of this disclosure will be described.

[1031] In LTE and NR systems, for example, a CCS can be configured where the scheduling cell and the scheduled cell are different. The motivation for introducing CCS is that the probability of successful DCI reception on the scheduling cell is higher than the probability of successful DCI reception on the scheduled cell.

[1032] Additionally, for example, since the scheduling cell for a BS to successfully CAP may be unpredictable, multiple scheduling cells can be configured for a single scheduled cell in an NR system using unlicensed frequency bands.

[1033] In the following description, various embodiments of this disclosure may relate to a CCS method for increasing the CAP success probability of a scheduled cell. In this sub-clause and various embodiments of this disclosure, a cell may be replaced by a BWP and / or an active BWP and / or a channel and / or a CAP (LBT) subband.

[1034] 3.3.1. Operations of the Receiver (Entity A)

[1035] 3.3.1.1. [Method #3-1A] Any pair of arbitrary CCS methods

[1036] According to various embodiments of this disclosure, a specific cell group can be defined and any cell in the cell group can be scheduled.

[1037] For example, suppose cell #1 and cell #2 are grouped into the aforementioned (CCS) cell group.

[1038] Based on this assumption, for example:

[1039] - Scenario 1: When CAP (LBT) succeeds only in one of the two cells, a cell can be scheduled for one and / or both cells. For example, when CAP succeeds in cell #1, cell #1 can be scheduled for either cell #1 or cell #2, or only one of cell #1 and cell #2.

[1040] - Scenario 2: When CAP (LBT) succeeds in both cells, each cell can schedule itself, or a specific cell can schedule both cells and / or a specific cell. For example, when CAP succeeds in both cell #1 and cell #2, cell #1 and / or cell #2 can schedule themselves (SCS), or cell #1 can schedule either cell #1 or cell #2.

[1041] In another example, suppose cell #1, cell #2, and cell #3 are grouped into a cell group.

[1042] Based on this assumption, for example:

[1043] - Scenario 1: When CAP (LBT) succeeds only in one of the three cells, a cell can be scheduled for one or more and / or all cells. For example, when CAP succeeds only in cell #1, cell #1 can be scheduled for all cells #1, #2, and #3, or one or more of cells #1, #2, and #3.

[1044] - Scenario 2: When CAP (LBT) is successful in all three cells, each cell can schedule itself, or a specific cell can schedule two cells and / or one or more specific cells. For example, when CAP is successful in all cells #1, #2, and #3, cell #1 and / or cell #2 and / or cell #3 can schedule itself (SCS), or cell #1 can schedule all cells #1, #2, and #3, or one or more of cells #1, #2, and #3.

[1045] In an exemplary implementation, the same CORESET configuration and / or the same search space set configuration can be set for cells in a cell group.

[1046] For example, (assigning indexes to each cell in a cell group), the CORESET configuration and / or search space set configuration for the cell with the lowest (or highest) index can be applied to all cells in the group.

[1047] In an exemplary implementation, in order to match the DCI size for CCS with the DCI size for SCS, CIF may also exist in the DCI in the case of SCS (similar to CCS).

[1048] For example, suppose five cells belong to a cell group and a unique cell index is assigned to each cell. Based on this assumption, for example, the 3-bit CIF can always exist in the DCI regardless of which cell in the cell group is scheduled. For example, cell groups can only be applied to UL scheduling. For example, although the DL scheduling DCI can be configured with SCS and / or CCS, the UL-licensed DCI can always support CCS.

[1049] The various embodiments described above can be applied in the same manner as the DCI format (referred to as DCI format 3 for ease of description) that carries COT information (e.g., time axis and / or frequency axis information about the corresponding COT) and schedules DCI.

[1050] For example, cell groups that share COT information can be defined. For example, COT information about all carriers (cells) in a group can be transmitted in DCI format 3, which is transmitted on any cell (or a specific predefined cell) in the cell group.

[1051] For example, DCI format 3 can be transmitted on GC-PDCCH. That is, DCI format 3 can include group common information.

[1052] For example, a DCI format 3 can transmit COT information about multiple UEs and / or cells. In this case, for example, the cell carrying the COT information can be signaled to each UE in advance in some fields.

[1053] In another example, the COT information corresponding to a specific field of DCI format 3 may be specified to correspond to information about a cell that is spaced at a specific offset from a common reference point on the frequency axis.

[1054] For example, COT information corresponding to cells starting 10 RBs offset from the common reference point can be set in field A, and COT information corresponding to cells starting {10 RBs + 20MHz} offset from the common reference point can be set in field B. For example, each UE can obtain COT information in the corresponding field based on the frequency axis resources of each cell configured for the UE.

[1055] In the various embodiments described above in this disclosure, a cell may be replaced by a BWP and / or an active BWP and / or a cell and / or a CAP (LBT) subband. For example, a CAP subband is the basic unit of a CAP, which may have a size of, for example, 20 MHz.

[1056] Regardless of whether a CCS is configured for a specific unlicensed frequency band cell, the various implementation methods described above in this disclosure can be applied. For example, a UL-licensed DCI can always support CCS. For example, whether a DL-scheduling DCI supports SCS and / or CCS can be configured via RRC signaling, etc.

[1057] 3.3.1.2. [Method #3-2A] Configuration of PDCCH monitoring timing in DCI format carrying COT information

[1058] Refer to Figure 24 For example, in an NR system, the PDCCH monitoring timing of the search space set configured for the scheduled cell (and / or the active BWP in the cell, which may be replaced by BWP and / or active BWP and / or cell and / or CAP (LBT) subband in this sub-clause and various embodiments of this disclosure) can be linked to the search space set of the scheduled cell having the same index as the search space cell of the scheduled cell, and PDCCH monitoring is performed during the PDCCH monitoring timing.

[1059] However, the set of search spaces associated with the DCI format (for convenience, referred to as DCI format 3) that carries COT information (e.g., time axis and / or frequency axis information about the corresponding COT) may need to be processed separately. For example, since the UE can determine whether a DL Tx burst starts in an unlicensed band based on the corresponding DCI format 3, it may be advantageous to process the corresponding DCI format 3 separately.

[1060] For example, for a search space set associated with a DCI format, CI format 3 can be monitored during PDCCH monitoring times configured in (still) scheduled cells rather than scheduled cells.

[1061] For example, when multiple DCI formats, including DCI format 3, are linked to a corresponding search space set, at least one of the following options can be executed.

[1062] - Option 1: Specifies that monitoring of all DCI formats linked to the search space set is based on the configuration on the scheduled cell, or

[1063] - Option 2: Specify that the monitoring of DCI format 3, which is linked to the DCI format of the search space set, is based on the configuration on the scheduled cell, and other DCI formats are monitored based on the configuration on the scheduled cell.

[1064] 3.3.1.3. [Method #3-3A] Scheduling restrictions on CCS configuration

[1065] For example, if the BS transmits a DCI (Scheduled DL signal / channel) on the scheduled cell and then transmits a signal on the scheduled cell, and the CAP of the scheduled cell fails, the UE that received the transmitted DCI may unnecessarily attempt to receive the DL signal / channel. According to various embodiments of this disclosure, at least one of the following options can be performed to prevent this unnecessary UE operation.

[1066] - Option 1: The UE may not receive the DCI of the scheduled cell or may not anticipate the DCI before the PDCCH monitoring timing in the search space set configured in the scheduled cell that starts (or ends) earlier than the DLCOT start time on the scheduled cell.

[1067] - Option 2: The UE may not receive the DCI of a DL signal / channel that started (or ended) earlier than the DL COT start time on the scheduled cell, or may not expect to receive the DCI on the scheduled cell.

[1068] 3.3.2. Operations on the sending side (Entity B)

[1069] 3.3.2.1. [Method #3-1B] Any method for any CCS

[1070] According to various embodiments of this disclosure, a specific cell group can be defined and any cell in the cell group can be scheduled.

[1071] For example, suppose cell #1 and cell #2 are grouped into the aforementioned (CCS) cell group.

[1072] Based on this assumption, for example:

[1073] - Scenario 1: When CAP (LBT) succeeds only in one of the two cells, a cell can be scheduled for one and / or both cells. For example, when CAP succeeds only in cell #1, cell #1 can be scheduled for either cell #1 or cell #2, or either cell #1 or cell #2.

[1074] - Scenario 2: When CAP (LBT) succeeds in both cells, each cell can schedule itself, or a specific cell can schedule both cells and / or a specific cell. For example, when CAP succeeds in both cell #1 and cell #2, cell #1 and / or cell #2 can schedule themselves (SCS), or cell #1 can schedule either cell #1 or cell #2.

[1075] In another example, suppose cell #1, cell #2, and cell #3 are grouped into a cell group.

[1076] For example:

[1077] - Scenario 1: When CAP (LBT) succeeds only in one of the three cells, a cell can be scheduled for one or more and / or all cells. For example, when CAP succeeds only in cell #1, cell #1 can be scheduled for all cells #1, #2, and #3, or one or more of cells #1, #2, and #3.

[1078] - Scenario 2: When CAP (LBT) is successful in all three cells, each cell can schedule itself, or a specific cell can schedule two cells and / or one or more specific cells. For example, when CAP is successful in all cells #1, #2, and #3, cell #1 and / or cell #2 and / or cell #3 can schedule itself (SCS), or cell #1 can schedule all cells #1, #2, and #3, or one or more of cells #1, #2, and #3.

[1079] In an exemplary implementation, the same CORESET configuration and / or the same search space set configuration can be set for cells in a cell group.

[1080] For example, (assigning indexes to each cell in a cell group) the CORESET configuration and / or search space set configuration for the cell with the lowest (or highest) index can be applied to all cells in the group.

[1081] In an exemplary implementation, in order to match the DCI size for CCS with the DCI size for SCS, CIF may also exist in the DCI in the case of SCS (similar to CCS).

[1082] For example, suppose five cells belong to a cell group and each cell is assigned a unique cell index. Based on this assumption, for example, the 3-bit CIF can always exist in the DCI regardless of which cell in the cell group is scheduled. For example, cell groups can only be applied to UL scheduling. For example, although the DL scheduling DCI can be configured with SCS and / or CCS, the UL-licensed DCI can always support CCS.

[1083] The various embodiments described above can be applied in the same manner as the DCI format (referred to as DCI format 3 for ease of description) that carries COT information (e.g., time axis and / or frequency axis information about the corresponding COT) and schedules DCI.

[1084] For example, cell groups that share COT information can be defined. For example, COT information about all carriers (cells) in a group can be transmitted in DCI format 3, which is transmitted on any cell (or a specific predefined cell) in the cell group.

[1085] For example, DCI format 3 can be transmitted on GC-PDCCH. That is, DCI format 3 can include group common information.

[1086] For example, a DCI format 3 can transmit COT information about multiple UEs and / or cells. In this case, for example, each UE can be pre-signaled to indicate which field carries COT information about which cell.

[1087] In another example, the COT information corresponding to a specific field of DCI format 3 may be specified to correspond to information about a cell that is spaced at a specific offset from a common reference point on the frequency axis.

[1088] For example, COT information corresponding to cells starting 10 RBs offset from the common reference point can be set in field A, and COT information corresponding to cells starting {10 RBs + 20MHz} offset from the common reference point can be set in field B. For example, each UE can obtain COT information in the corresponding field based on the frequency axis resources of the cell configured for the UE.

[1089] In the various embodiments described above in this disclosure, a cell may be replaced by a BWP and / or an active BWP and / or a cell and / or a CAP (LBT) subband. For example, a CAP subband is the basic unit of a CAP, which may have a size of, for example, 20 MHz.

[1090] Regardless of whether a CCS is configured for a specific unlicensed frequency band cell, the various implementation methods described above in this disclosure can be applied. For example, a UL-licensed DCI can always support CCS. For example, whether a DL-scheduling DCI supports SCS and / or CCS can be configured via RRC signaling, etc.

[1091] 3.3.2.2. [Method #3-2B] Configuration of PDCCH monitoring timing in DCI format carrying COT information

[1092] Refer to Figure 24 For example, in an NR system, the PDCCH monitoring timing of the search space set configured for the scheduled cell (and / or the active BWP in the cell, which may be replaced by BWP and / or active BWP and / or cell and / or CAP (LBT) subband in the cell) in this sub-clause and various embodiments of this disclosure) can be linked to the search space set of the scheduled cell having the same index as the search space cell of the scheduled cell, and PDCCH monitoring is performed during the PDCCH monitoring timing.

[1093] However, the set of search spaces associated with the DCI format (for convenience, referred to as DCI format 3) that carries COT information (e.g., time axis and / or frequency axis information about the corresponding COT) may need to be processed separately. For example, since the UE can determine whether a DL Tx burst starts in an unlicensed band based on the corresponding DCI format 3, it may be advantageous to process the corresponding DCI format 3 separately.

[1094] For example, for a search space set associated with DCI format 3, DCI format 3 can be monitored during PDCCH monitoring times configured in (still) scheduled cells rather than scheduled cells.

[1095] For example, when multiple DCI formats, including DCI format 3, are linked to a corresponding search space set, at least one of the following options can be executed.

[1096] - Option 1: Specifies that monitoring of all DCI formats linked to the search space set is based on the configuration on the scheduled cell, or

[1097] - Option 2: Specify that the monitoring of DCI format 3, which is linked to the DCI format of the search space set, is based on the configuration on the scheduled cell, and other DCI formats are monitored based on the configuration on the scheduled cell.

[1098] 3.3.2.3. [Method #3-3B] Scheduling restrictions when configuring CCS

[1099] For example, if the BS needs to transmit a DCI (scheduled DL signal / channel) on the scheduled cell and then transmit a signal on the scheduled cell, and the CAP of the scheduled cell fails, unnecessary resources may be consumed in the DL transmission. According to various embodiments of this disclosure, at least one of the following options can be performed to prevent this unnecessary waste of resources.

[1100] - Option 1: The BS may not send the DCI for the scheduled cell before the PDCCH monitoring timing in the search space set configured in the scheduled cell that starts (or ends) earlier than the DL COT start time on the scheduled cell.

[1101] - Option 2: The BS may not (on the scheduled cell) send the DCI of the DL signal / channel that started (or ended) earlier than the DL COT start time on the scheduled cell.

[1102] Since examples of the methods presented above can be included as one of the methods for implementing this disclosure, it is obvious that these examples can be considered as the proposed methods. Furthermore, the proposed methods can be implemented independently, or some methods can be combined (or merged) for implementation. Additionally, it can be specified that information indicating whether to apply the proposed methods (or information about the rules regarding the proposed methods) is indicated by the eNB to the UE via a predefined signal (or physical layer or higher layer signal), or requested by the transmitting or receiving UE from the receiving or sending UE.

[1103] 3.4. Initial Network Access and Communication Processing

[1104] According to various embodiments of this disclosure, the UE can perform network access processing to execute the procedures and / or methods described / presented above. For example, the UE can receive system information and configuration information required to execute the procedures and / or methods described / presented above and store the received information in a memory. The configuration information required by various embodiments of this disclosure can be received via higher layers (e.g., RRC signaling or MAC signaling).

[1105] Figure 29 This diagram illustrates the initial network access and subsequent communication processing. In the NR systems to which the various embodiments of this disclosure are applicable, the physical channel and RS can be transmitted via beamforming. When beamforming-based signal transmission is supported, beam management can be performed for beam alignment between the BS and UE. Furthermore, the signals proposed in the various embodiments of this disclosure can be transmitted / received via beamforming. In RRC IDLE mode, beam alignment can be performed based on synchronization signal blocks (SSB or SS / PBCH blocks), while in RRC CONNECTED mode, beam alignment can be performed based on CSI-RS (in DL) and SRS (in UL). Conversely, when beamforming-based signal transmission is not supported, beam-related operations can be omitted in the following description.

[1106] Reference Figure 29The BS (e.g., eNB) can periodically transmit SSBs (S2702). SSBs include PSS / SSS / PBCH. SSBs can be transmitted via beam sweep. The BS can then transmit Remaining Minimal System Information (RMSI) and other System Information (OSI) (S2704). The RMSI may include information required by the UE to perform initial access to the BS (e.g., PRACH configuration information). After detecting an SSB, the UE identifies the optimal SSB. The UE can then transmit a RACH preamble (Message 1: Msg1) in the PRACH resource linked / corresponding to the index (i.e., beam) of the optimal SSB (S706). The beam direction of the RACH preamble is associated with the PRACH resource. The association between the PRACH resource (and / or the RACH preamble) and the SSB (SSB index) can be configured via system information (e.g., RMSI). Subsequently, during the RACH process, the BS may send a Random Access Response (RAR) (Msg2) in response to the RACH preamble (S2708), the UE may send Msg3 (e.g., an RRC connection request) based on the UL permission included in the RAR (S2710), and the BS may send a contention resolution message (Msg4) (S2712). Msg4 may include RRC connection settings.

[1107] When an RRC connection is established between the BS and UE during RACH, beam alignment can subsequently be performed based on SSB / CSI-RS (in DL) and SRS (in UL). For example, the UE can receive SSB / CSI-RS (S2714). The UE can use SSB / CSI-RS to generate a beam / CSI report. The BS can request the UE to send a beam / CSI report via DCI (S2716). In this case, the UE can generate a beam / CSI report based on SSB / CSI-RS and send the generated beam / CSI report to the BS on PUSCH / PUCCH (S2718). The beam / CSI report may include beam measurement results, information about the preferred beam, etc. The BS and UE can switch beams based on the beam / CSI report (S2720a and S2720b).

[1108] Subsequently, the UE and BS may execute the processes and / or methods described / proposed above. For example, based on configuration information obtained in network access processing (e.g., system information acquisition processing, RRC connection processing via RACH, etc.), the UE and BS may transmit radio signals by processing information stored in memory, or may process received radio signals according to various embodiments of this disclosure and store the processed signals in memory. The radio signals may include at least one of PDCCH, PDSCH, or RS on DL and at least one of PUCCH, PUSCH, or SRS on UL.

[1109] 3.5. DRX (Discontinuous Receiver)

[1110] Figure 30 These are exemplary DRX operations according to various embodiments of this disclosure.

[1111] According to various embodiments of this disclosure, the UE can perform DRX operation within the processes and / or methods described / presented above. When the UE is configured with DRX, the UE can reduce power consumption by discontinuously receiving DL signals. DRX can be performed in the RRC_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state. In the RRC_IDLE state and RRC_INACTIVE state, DRX is used for discontinuous reception of paging signals.

[1112] 3.5.1.RRC_CONNECTED DRX

[1113] In the RRC_CONNECTED state, DRX is used for discontinuous reception of PDCCH. DRX in the RRC_CONNECTED state is referred to as RRC_CONNECTED DRX.

[1114] Reference Figure 30 (a) The DRX cycle comprises an On duration and a DRX opportunity. The DRX cycle defines the time interval between periodic repetitions of the On duration. The On duration is the time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the On duration. When the UE successfully detects a PDCCH during the PDCCH monitoring period, the UE starts an inactivity timer and remains awake. Conversely, when the UE fails to detect any PDCCH during the PDCCH monitoring period, the UE transitions to a sleep state after the On duration. Therefore, when DRX is configured, the UE can perform PDCCH monitoring / reception discontinuously in the time domain in the above procedures and / or methods. For example, when DRX is configured, the PDCCH reception opportunity (e.g., a time slot with a PDCCH search space) can be configured discontinuously according to the DRX configuration in this disclosure. Conversely, when DRX is not configured, the UE can perform PDCCH monitoring / reception continuously in the time domain in the above procedures and / or methods, depending on the implementation. For example, when DRX is not configured, PDCCH reception timing (e.g., time slots with PDCCH search space) can be continuously configured in this disclosure. Regardless of whether DRX is configured, PDCCH monitoring can be limited during the time period configured as a measurement interval.

[1115] Table 19 describes the DRX operation of the UE (in the RRC_CONNECTED state). Referring to Table 19, DRX configuration information is received via higher-layer signaling (e.g., RRC signaling), and DRX is controlled to be on / off via DRX commands from the MAC layer. Once DRX is configured, the UE can perform PDCCH monitoring discontinuously according to various embodiments of this disclosure using the procedures and / or methods described above.

[1116] [Table 19]

[1117]

[1118] MAC-CellGroupConfig includes the configuration information required to configure MAC parameters for a cell group. MAC-CellGroupConfig may also include DRX configuration information. For example, when defining a DRX, MAC-CellGroupConfig may include the following information.

[1119] The value of -drx-OnDurationTimer defines the duration of the starting period of the DRX loop.

[1120] The value of -drx-InactivityTimer defines the duration of the time period after the UE is woken up following the detection of a PDCCH timing that indicates the initial UL or DL ​​data.

[1121] The value of -drx-HARQ-RTT-TimerDL defines the maximum time period from the initial DL transmission received until a DL retransmission is received.

[1122] The value of -drx-HARQ-RTT-TimerDL defines the maximum duration of the time period from the receipt of permission for the initial UL transmission until permission for a UL retransmission is received.

[1123] -drx-LongCycleStartOffset: Defines the duration and start time of the DRX loop.

[1124] -drx-ShortCycle (optional): Defines the duration of a short DRX cycle.

[1125] When any of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL are running, the UE performs PDCCH monitoring at each PDCCH timing and remains in the wake-up state.

[1126] 3.5.2.RRC_IDLE DRX

[1127] In RRC_IDLE and RRC_INACTIVE states, DRX is used to receive paging signals discontinuously. For convenience, DRX executed in RRC_IDLE (or RRC_INACTIVE) state is referred to as RRC_IDLE DRX.

[1128] Therefore, when configuring DRX, PDCCH monitoring / reception can be performed discontinuously in the time domain within the procedures and / or methods described / presented above.

[1129] Reference Figure 30 (b) DRX can be configured for discontinuous reception of paging signals. The UE can receive DRX configuration information from the BS via higher-layer (e.g., RRC) signaling. DRX configuration information may include DRX cycles, DRX offsets, DRX timer configuration information, etc. The UE repeats the On duration and sleep duration according to the DRX cycle. The UE can operate in wake-up mode during the On duration and in sleep mode during the sleep duration. In wake-up mode, the UE can monitor paging opportunities (POs) to receive paging messages. PO refers to the time resource / interval (e.g., subframe or time slot) at which the UE expects to receive paging messages. PO monitoring includes monitoring a PDCCH (MPDCCH or NPDCCH) scrambled with P-RNTI (hereinafter referred to as the paging PDCCH) in the PO. Paging messages may be included in the paging PDCCH or in a PDSCH scheduled by the paging PDCCH. One or more POs may be included in a paging frame (PF), and the PF may be configured periodically based on the UE ID. A PF can correspond to a radio frame, and the UE ID can be determined based on the UE's International Mobile Subscriber Identity (IMSI). When DRX is configured, the UE monitors only one PO per DRX cycle. When the UE receives a paging message in the PO indicating a change in its ID and / or system information, the UE can perform a RACH procedure to initialize (or reconfigure) the connection with the BS, or to receive (or obtain) new system information from the BS. Therefore, PO monitoring can be performed discontinuously in the time domain in the above procedures and / or methods to perform the RACH procedure for connecting to the BS or to receive (or obtain) new system information from the BS.

[1130] Those skilled in the art will clearly understand that the above-described initial access processing and / or DRX operation can be combined with the contents of the previously described Clauses 1 to 3 to form various other embodiments of this disclosure.

[1131] Figure 31 This is a simplified diagram illustrating the signal flow of methods for operating the UE and BS according to various embodiments of the present disclosure.

[1132] Figure 32 This is a flowchart illustrating a method of operating a UE according to various embodiments of the present disclosure.

[1133] Figure 33 This is a flowchart illustrating a method of operating a BS according to various embodiments of the present disclosure.

[1134] Reference Figures 31 to 33 According to exemplary embodiments, in operations 3101, 3201, and 3301, the BS may send information about a group of one or more search space sets related to PDCCH monitoring, and the UE may obtain information about the group. For example, the group may include a first group and a second group.

[1135] According to exemplary embodiments, in operations 3103, 3203 and 3303, the UE may perform PDCCH monitoring based on information about the group, and the BS may send PDCCH related to the information about the group.

[1136] More specific operations of the BS and / or UE according to various embodiments of this disclosure may be described and performed based on Clauses 1 to 3 above.

[1137] Since examples of the proposed methods described above can also be included in one of the implementation methods of various embodiments of this disclosure, it is obvious that the examples are considered as proposed methods. Although the proposed methods described above can be implemented independently, they can also be implemented as a combination (aggregation) of some of the proposed methods. Rules can be defined such that the BS informs the UE of information regarding whether to apply the proposed methods (or information regarding the rules of the proposed methods) through predefined signals (e.g., physical layer signals or higher layer signals).

[1138] 4. Exemplary configurations of apparatus for implementing various embodiments of the present disclosure

[1139] 4.1. Exemplary configurations of apparatuses employing various embodiments of the present disclosure

[1140] Figure 34 This is a diagram illustrating an apparatus for implementing various embodiments of the present disclosure.

[1141] Figure 34 The device shown may be a UE and / or BS (e.g., eNB or gNB) suitable for performing the above mechanism or any device performing the same operation.

[1142] Reference Figure 34The device may include a digital signal processor (DSP) / microprocessor 210 and a radio frequency (RF) module (transceiver) 235. The DSP / microprocessor 210 is electrically connected to and controls the transceiver 235. Depending on the designer's choice, the device may also include a power management module 205, a battery 255, a display 215, a keypad 220, a SIM card 225, a memory device 230, an antenna 240, a speaker 245, and an input device 250.

[1143] Specifically, Figure 34 A UE may be shown comprising a receiver 235 configured to receive request messages from the network and a transmitter 235 configured to send timing transmission / receive timing information to the network. These receivers and transmitters may form a transceiver 235. The UE may also include a processor 210 coupled to the transceiver 235.

[1144] also, Figure 34 A network apparatus may be shown including a transmitter 235 configured to send a request message to a UE and a receiver 235 configured to receive timing transmission / reception information from the UE. These receivers and transmitters may form a transceiver 235. The network may also include a processor 210 coupled to the transceiver 235. The processor 210 may calculate latency based on the transmission / reception timing information.

[1145] Processors included in the UE (or communication device included in the UE) and BS (or communication device included in the BS) according to various embodiments of the present disclosure can operate as follows while controlling the memory.

[1146] According to various embodiments of this disclosure, the UE or BS may include at least one transceiver, at least one memory, and at least one processor coupled to the at least one transceiver and the at least one memory. The at least one memory may store instructions that cause the at least one processor to perform the following operations.

[1147] The communication device included in the UE or BS may be configured to include at least one processor and at least one memory. The communication device may be configured to include at least one transceiver, or may be configured not to include at least one transceiver, but to be connected to at least one transceiver.

[1148] According to various embodiments of this disclosure, at least one processor included in the UE (or at least one processor of a communication device in the UE) can acquire information about a group of one or more search space sets related to Physical Downlink Control Channel (PDCCH) monitoring. According to various embodiments of this disclosure, at least one processor included in the UE can perform PDCCH monitoring based on the information about the groups and according to a search space set related to a second group within the groups. For example, after one or more predetermined conditions are met: (i) after a first predetermined time, PDCCH monitoring can begin according to a search space set related to a first group within the groups that is different from the second group, and (ii) PDCCH monitoring can end according to a search space set related to the second group.

[1149] According to various embodiments of the present disclosure, at least one processor included in the BS (or at least one processor of a communication device in the BS) can transmit information about groups of one or more search space sets related to PDCCH monitoring. According to various embodiments of the present disclosure, at least one processor included in the BS can transmit PDCCH based on a search space set related to a second group within the group. According to various embodiments of the present disclosure, after one or more predetermined conditions are met: (i) after a first predetermined time, PDCCH transmission can begin based on a search space set related to a first group within the group that is different from the second group, and (ii) PDCCH transmission can end based on a search space set related to the second group.

[1150] More specific operations of the processors included in the BS and / or UE according to various embodiments of this disclosure may be described and performed based on Clauses 1 to 3 above.

[1151] Unless they contradict each other, the various embodiments of this disclosure can be combined to implement them. For example, unless they contradict each other, the BS and / or UE according to the various embodiments of this disclosure can operate in combination with the embodiments described in Clauses 1 to 3 above.

[1152] 4.2. Examples of communication systems applying various embodiments of the present disclosure

[1153] This specification primarily describes various embodiments of the present disclosure concerning data transmission and reception between a BS and a UE in a wireless communication system. However, the various embodiments of the present disclosure are not limited thereto. For example, the various embodiments of the present disclosure may also involve the following technical configurations.

[1154] The various descriptions, functions, processes, proposals, methods, and / or operation flowcharts of the various embodiments of this disclosure described in this document can be applied to (but are not limited to) various fields where wireless communication / connectivity (e.g., 5G) is required between devices.

[1155] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings / description, unless otherwise described, the same reference numerals may denote the same or corresponding hardware blocks, software blocks, or functional blocks.

[1156] Figure 35 Exemplary communication systems applying various embodiments of the present disclosure are shown.

[1157] Reference Figure 35 The communication system 1 applied to various embodiments of this disclosure includes wireless devices, base stations (BS), and networks. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and may be referred to as a communication / radio / 5G device. Wireless devices may include (but are not limited to) robots 100a, vehicles 100b-1 and 100b-2, extended reality (XR) devices 100c, handheld devices 100d, home appliances 100e, Internet of Things (IoT) devices 100f, and artificial intelligence (AI) devices / servers 400. For example, vehicles may include vehicles with wireless communication capabilities, autonomous vehicles, and vehicles capable of performing communication between vehicles. Herein, vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may take the form of head-mounted displays (HMDs), head-up displays (HUDs) installed in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Handheld devices may include smartphones, smart tablets, wearable devices (e.g., smartwatches or smart glasses) and computers (e.g., laptops). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, the BS and network may be implemented as wireless devices, and a particular wireless device 200a may operate as a BS / network node relative to other wireless devices.

[1158] Wireless devices 100a to 100f can connect to network 300 via BS200. AI technology can be applied to wireless devices 100a to 100f, and wireless devices 100a to 100f can connect to AI server 400 via network 300. Network 300 can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although wireless devices 100a to 100f can communicate with each other via BS200 / network 300, wireless devices 100a to 100f can perform direct communication with each other (e.g., sidelink communication) without going through the BS / network. For example, vehicles 100b-1 and 100b-2 can perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) can perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[1159] Wireless communication / connections 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS200 or between BS200 / BS200. In this document, wireless communication / connections can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). Wireless devices and BS / wireless devices can transmit / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, wireless communication / connections 150a and 150b can transmit / receive signals via various physical channels. For this purpose, at least a portion of the configuration information for configuring the process of transmitting / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes can be performed based on various proposals of this disclosure.

[1160] 4.2.1 Examples of wireless devices applying various embodiments of the present disclosure

[1161] Figure 36 Exemplary wireless devices to which various embodiments of this disclosure are applicable are shown.

[1162] Reference Figure 36 The first wireless device 100 and the second wireless device 200 can transmit radio signals via various RATs (e.g., LTE and NR). In this document, {first wireless device 100 and second wireless device 200} can correspond to... Figure 35 {Wireless Device 100x and BS200} and / or {Wireless Device 100x and Wireless Device 100x}.

[1163] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and additionally include one or more transceivers 106 and / or one or more antennas 108. The processors 102 may control the memories 104 and / or the transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate a first information / signal, and then transmit a radio signal including the first information / signal via the transceivers 106. The processor 102 may receive a radio signal including a second information / signal via the transceivers 106, and then store the information obtained by processing the second information / signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information relating to the operation of the processor 102. For example, the memory 104 may store software code including commands for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed herein. In this document, processor 102 and memory 104 may be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). Transceiver 106 may be connected to processor 102 and transmit and / or receive radio signals via one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. Transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In various embodiments of this disclosure, a wireless device may represent a communication modem / circuit / chip.

[1164] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and additionally include one or more transceivers 206 and / or one or more antennas 208. The processors 202 may control the memories 204 and / or the transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processors 202 may process information in the memories 204 to generate a third information / signal, and then transmit a radio signal including the thir...

Claims

1. A method performed by a user equipment (UE) configured to operate in a wireless communication system, the method comprising the following steps: Receive first information about multiple groups, wherein each of the multiple groups is associated with at least one search space set; Based on the first information, the physical downlink control channel (PDCCH) is monitored according to at least one search space set associated with one of the plurality of groups; Based on the first downlink control information (DCI) obtained by monitoring the PDCCH to schedule uplink transmissions in the unlicensed frequency band: (i) Perform the Channel Access Procedure (CAP) for the uplink transmission to access the unlicensed frequency band, and (ii) Perform the uplink transmission based on the CAP. Specifically, this is based on second information related to the channel occupancy time (COT) obtained by monitoring the PDCCH, specifically the second DCI indication. (i) After the COT, monitoring of the PDCCH begins based on at least one search space set associated with the first of the plurality of groups, and (ii) After the COT, monitoring of the PDCCH according to at least one search space set associated with the second group of the plurality of groups ends. The second DCI further indicates information related to at least one available frequency resource in the unlicensed frequency band, and The total size of the at least one available frequency resource is based on at least one field related to the available frequency resources included in the second DCI.

2. The method according to claim 1, wherein, The PDCCH is monitored according to at least one search space set associated with the second group, and Among them, it is based on satisfying at least one predetermined condition: (i) Begin monitoring the PDCCH based on the at least one search space set associated with the first group, and (ii) End monitoring of the PDCCH based on the at least one search space set associated with the second group.

3. The method according to claim 1, wherein, In the time domain, the at least one search space set associated with the first group is located outside the COT, and In the time domain, the at least one search space set associated with the second group is located within the COT.

4. The method according to claim 3, wherein, In the time domain, the at least one search space set associated with the first group is periodically configured based on a first periodicity, and In the time domain, the at least one search space set associated with the second group is periodically configured based on a second periodicity that is different from the first periodicity.

5. The method according to claim 1, wherein, The first information is received based on higher-level signaling.

6. The method according to claim 1, wherein, Based on configuring discontinuous reception DRX for the UE, the PDCCH monitoring is performed during the duration of the DRX activation.

7. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising: transceiver; as well as At least one processor, wherein the at least one processor is connected to the transceiver, Wherein, the at least one processor is configured to: Receive first information about multiple groups, wherein each of the multiple groups is associated with at least one search space set; Based on the first information, the physical downlink control channel (PDCCH) is monitored according to at least one search space set associated with one of the plurality of groups; Based on the first downlink control information (DCI) obtained by monitoring the PDCCH to schedule uplink transmissions in the unlicensed frequency band: (i) Perform the Channel Access Procedure (CAP) for the uplink transmission to access the unlicensed frequency band, and (ii) Perform the uplink transmission based on the CAP. Specifically, this is based on second information related to the channel occupancy time (COT) obtained by monitoring the PDCCH, specifically the second DCI indication. (i) After the COT, monitoring of the PDCCH begins based on at least one search space set associated with the first of the plurality of groups, and (ii) After the COT, monitoring of the PDCCH according to at least one search space set associated with the second group of the plurality of groups ends. The second DCI further indicates information related to at least one available frequency resource in the unlicensed frequency band, and The total size of the at least one available frequency resource is based on at least one field related to the available frequency resources included in the second DCI.

8. The UE according to claim 7, wherein, The at least one processor is also configured to communicate with at least one of a mobile terminal, a network, or an autonomous vehicle other than the vehicle including the UE.

9. A method performed by a base station (BS) configured to operate in a wireless communication system, the method comprising the steps of: Send first information about multiple groups, wherein each of the multiple groups is associated with at least one search space set; Based on the first information, a physical downlink control channel (PDCCH) is transmitted according to at least one search space set associated with one of the plurality of groups; Based on the first downlink control information (DCI) transmitted via the PDCCH in the unlicensed frequency band for downlink transmission: (i) Perform the Channel Access Procedure (CAP) for the downlink transmission to access the unlicensed frequency band, and (ii) Perform the downlink transmission based on the CAP. Specifically, this is based on second information related to the Channel Occupancy Time (COT) indicated by the second DCI sent via the PDCCH: (i) After the COT, the PDCCH is sent according to at least one search space set associated with the first group of the plurality of groups, and (ii) After the COT, the transmission of the PDCCH is terminated according to at least one search space set associated with the second group of the plurality of groups. The second DCI further indicates information related to at least one available frequency resource in the unlicensed frequency band, and The total size of the at least one available frequency resource is based on at least one field related to the available frequency resources included in the second DCI.

10. A base station (BS) configured to operate in a wireless communication system, the BS comprising: transceiver; as well as At least one processor, wherein the at least one processor is connected to the transceiver, Wherein, the at least one processor is configured to: Send first information about multiple groups, wherein each of the multiple groups is associated with at least one search space set; Based on the first information, a physical downlink control channel (PDCCH) is transmitted according to at least one search space set associated with one of the plurality of groups; Based on the first downlink control information (DCI) transmitted via the PDCCH in the unlicensed frequency band for downlink transmission: (i) Perform the Channel Access Procedure (CAP) for the downlink transmission to access the unlicensed frequency band, and (ii) Perform the downlink transmission based on the CAP. Specifically, this is based on second information related to the Channel Occupancy Time (COT) indicated by the second DCI sent via the PDCCH: (i) After the COT, the PDCCH is sent according to at least one search space set associated with the first group of the plurality of groups, and (ii) After the COT, the transmission of the PDCCH is terminated according to at least one search space set associated with the second group of the plurality of groups. The second DCI further indicates information related to at least one available frequency resource in the unlicensed frequency band, and The total size of the at least one available frequency resource is based on at least one field related to the available frequency resources included in the second DCI.

Images