Method and device for determining channel access in a wireless communication system

Abstract

A method and apparatus for determining channel access in a wireless communication system are disclosed. In an example from the perspective of a user equipment (UE), the UE performs a first transmission without listen-before-talk, where the first transmission is a preamble transmission. The UE performs a listen-before-talk for a second transmission of a signal other than the preamble.

Description

Technical Field

[0001] The present disclosure relates generally to wireless communication networks, and more particularly, to methods and apparatus for determining channel access in a wireless communication system. Background Art

[0002] With the rapidly growing demand for transferring large amounts of data to and from mobile communication devices, traditional mobile voice communication networks have evolved into networks that use Internet Protocol (IP) data packets for communication. This IP packet communication can provide IP-based voice, multimedia, multicast, and on-demand communication services to users of mobile communication devices.

[0003] An exemplary network architecture is the Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The E-UTRAN system can provide high data throughput to enable the aforementioned IP-based voice and multimedia services. Currently, the 3GPP standards organization is discussing new next-generation (e.g., 5G) radio technologies. Consequently, changes to the current body of 3GPP standards are currently being submitted and considered to evolve and complete the 3GPP standards. Summary of the Invention

[0004] According to the present disclosure, one or more apparatuses and / or methods are provided. In an example from the perspective of a user equipment (UE), the UE performs a first transmission without listen-before-talk (LBT), where the first transmission is a preamble transmission. The UE performs LBT for a second transmission of a signal other than the preamble.

[0005] In an example from the perspective of a UE, the UE transmits a first signal on a channel without sensing the channel, wherein the first signal includes a preamble. The UE senses the channel for transmission of a second signal, wherein the second signal does not include a preamble. After sensing the channel, the UE transmits the second signal on the channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 The drawing shows a wireless communication system according to an exemplary embodiment.

[0007] Figure 2 is a block diagram of a transmitter system (also referred to as an access network) and a receiver system (also referred to as a user equipment or UE) according to an exemplary embodiment.

[0008] Figure 3 is a functional block diagram of a communication system according to an exemplary embodiment.

[0009] Figure 4 According to an exemplary embodiment Figure 3 Functional block diagram of the program code.

[0010] Figure 5 is a diagram illustrating uplink-downlink timing relationships according to an exemplary embodiment.

[0011] Figure 6 is a flow chart according to an exemplary embodiment.

[0012] Figure 7 is a flow chart according to an exemplary embodiment.

[0013] Figure 8 is a flow chart according to an exemplary embodiment.

[0014] Figure 9 is a flow chart according to an exemplary embodiment. DETAILED DESCRIPTION

[0015] The exemplary wireless communication systems and devices described below employ wireless communication systems that support broadcast services. Wireless communication systems are widely deployed to provide various types of communications, such as voice, data, and the like. These systems may be based on code division multiple access (CDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) radio access, 3GPP Long Term Evolution Advanced (LTE-A or LTE-Advanced), 3GPP2 Ultra Mobile Broadband (UMB), WiMax, 3GPP New Radio (NR) radio access for 5G, or some other modulation technology.

[0016] Specifically, the exemplary wireless communication system apparatus described below may be designed to support one or more standards, such as those provided by a consortium named "3rd Generation Partnership Project," referred to herein as 3GPP, including: 3GPP TS 38.211 V15.7.0, "NR Physical Channels and Modulation"; Draft 3GPP TS 37.213 V16.4.0, "NR Physical Layer Procedures for Shared Spectrum Channel Access"; RP-202925, "Revision WID: Extending Current NR Operation to 71 GHz"; and 3GPP TS 38.214 V16.4.0, "NR Physical Layer Procedures for Data." The standards and documents listed above are hereby expressly incorporated by reference in their entirety.

[0017] Figure 1 A multiple access wireless communication system according to one or more embodiments of the present disclosure is presented. An access network 100 (AN) includes multiple antenna groups, one antenna group includes 104 and 106, another antenna group includes 108 and 110, and yet another antenna group includes 112 and 114. Figure 1 , only two antennas are shown for each antenna group, but each antenna group may utilize more or fewer antennas. Access terminal 116 (AT) communicates with antennas 112 and 114, with antennas 112 and 114 transmitting information to access terminal 116 via forward link 120 and receiving information from access terminal 116 via reverse link 118. AT 122 communicates with antennas 106 and 108, with antennas 106 and 108 transmitting information to AT 122 via forward link 126 and receiving information from AT 122 via reverse link 124. In a frequency-division duplexing (FDD) system, communication links 118, 120, 124, and 126 may use different frequencies for communication. For example, forward link 120 may use a different frequency than that used by reverse link 118.

[0018] Each group of antennas and / or the area in which they are designed to communicate is often referred to as a sector of the access network. In an embodiment, the antenna groups can each be designed to communicate with access terminals in a sector of the area covered by the access network 100.

[0019] In communications on forward links 120 and 126, the transmit antennas of access network 100 may utilize beamforming to improve the signal-to-noise ratio of the forward links for the different access terminals 116 and 122. Also, an access network that uses beamforming to transmit to access terminals randomly dispersed throughout the coverage area of ​​the access network generally causes less interference to access terminals in neighboring cells than an access network that transmits to all of its access terminals via a single antenna.

[0020] An access network (AN) may be a fixed station or base station for communicating with a terminal and may also be referred to as an access point, Node B, base station, enhanced base station, eNodeB (eNB), next generation NodeB (gNB), or some other terminology. An access terminal (AT) may also be referred to as user equipment (UE), a wireless communication device, terminal, access terminal, or some other terminology.

[0021] Figure 2 An embodiment is presented of a transmitter system 210 (also referred to as an access network) and a receiver system 250 (also referred to as an access terminal (AT) or user equipment (UE)) in a multiple-input and multiple-output (MIMO) system 200. At the transmitter system 210, traffic data for a plurality of data streams may be provided from a data source 212 to a transmit (TX) data processor 214.

[0022] In one embodiment, each data stream is transmitted through a respective transmit antenna. TX data processor 214 formats, codes, and interleaves the traffic data for each data stream based on a particular coding scheme selected for that data stream to provide coded data.

[0023] The decoded data for each data stream may be multiplexed with pilot data using orthogonal frequency-division multiplexing (OFDM) techniques. The pilot data may typically be a known data pattern processed in a known manner and used at the receiver system to estimate the channel response. The multiplexed pilot and decoded data for each data stream may then be modulated (i.e., symbol mapped) based on a particular modulation scheme selected for each data stream (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-ary phase shift keying (M-PSK), or M-ary quadrature amplitude modulation (M-QAM), etc.) to provide modulation symbols. Instructions executed by processor 230 may determine the data rate, coding, and / or modulation for each data stream.

[0024] The modulation symbols for the data streams are then provided to a TX MIMO processor 220, which may further process the modulation symbols (e.g., for OFDM). TX MIMO processor 220 then provides NT modulation symbol streams to NT transmitters (TMTR) 222a through 222t. In certain embodiments, TX MIMO processor 220 may apply beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.

[0025] Each transmitter 222 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and / or upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel. NT modulated signals from transmitters 222a through 222t may then be transmitted from NT antennas 224a through 224t, respectively.

[0026] At receiver system 250, the transmitted modulated signals are received by NR antennas 252a through 252r and the received signal from each antenna 252 may be provided to a respective receiver (RCVR) 254a through 254r. Each receiver 254 may condition (e.g., filter, amplify, and downconvert) a respective received signal, digitize the conditioned signal to provide samples, and / or further process the samples to provide a corresponding “received” symbol stream.

[0027] Next, RX data processor 260 receives and / or processes the NR received symbol streams from NR receivers 254 based on a particular receiver processing technique to provide NT "detected" symbol streams. RX data processor 260 can then demodulate, deinterleave, and / or decode each detected symbol stream to recover the traffic data for the data stream. The processing by RX processor 260 can be complementary to that performed by TX MIMO processor 220 and TX data processor 214 at transmitter system 210.

[0028] Processor 270 may periodically determine which precoding matrix to use (discussed below). Processor 270 formulates a reverse link message comprising a matrix index portion and a rank value portion.

[0029] The reverse link message may include various types of information regarding the communication link and / or the received data stream. The reverse link message may then be processed by the TX data processor 238 (which may also receive traffic data for several data streams from the data source 236), modulated by the modulator 280, conditioned by the transmitters 254a through 254r, and / or transmitted back to the transmitter system 210.

[0030] At transmitter system 210, the modulated signal from receiver system 250 is received by antenna 224, conditioned by receiver 222, demodulated by demodulator 240, and processed by RX data processor 242 to extract the reverse link message transmitted by receiver system 250. Processor 230 may then determine which precoding matrix to use to determine the beamforming weights and may then process the extracted message.

[0031] Figure 3 An alternative simplified functional block diagram of a communication device according to one embodiment of the disclosed subject matter is presented. Figure 3 As shown, the communication device 300 in the wireless communication system can be used to implement Figure 1 UE (or AT) 116 and 122 in or Figure 1 The base station (or AN) 100 in the wireless communication system may be an LTE system or an NR system. The communication device 300 may include an input device 302, an output device 304, a control circuit 306, a central processing unit (CPU) 308, a memory 310, a program code 312, and a transceiver 314. The control circuit 306 executes the program code 312 in the memory 310 through the CPU 308, thereby controlling the operation of the communication device 300. The communication device 300 may receive a signal input by a user through the input device 302 (for example, a keyboard or a keypad), and may output images and sounds through the output device 304 (for example, a display or a speaker). The transceiver 314 is used to receive and transmit wireless signals, pass the received signals to the control circuit 306, and wirelessly output the signals generated by the control circuit 306. The communication device 300 in the wireless communication system may also be used to implement Figure 1 AN 100 in.

[0032] Figure 4 According to one embodiment of the disclosed subject matter Figure 3 3. A simplified block diagram of program code 312 is shown in FIG. In this embodiment, program code 312 includes an application layer 400, a layer 3 portion 402, and a layer 2 portion 404, and is coupled to a layer 1 portion 406. Layer 3 portion 402 may perform radio resource control. Layer 2 portion 404 may perform link control. Layer 1 portion 406 may perform and / or implement physical connectivity.

[0033] One or more frame structures associated with a Radio Access Technology (RAT) and / or New RAT (NR) (associated with 5G) can accommodate various requirements associated with time and / or frequency resources, such as ultra-low latency (e.g., approximately 0.5 ms) to delay-tolerant services for Machine Type Communication (MTC), and from high peak rates for enhanced Mobile Broadband (eMBB) to very low data rates for MTC. Low latency (e.g., short Transmission Time Intervals (TTIs)) and / or mixing / adapting to different TTIs can be important for various applications. In addition to different services and requirements, forward compatibility is also an important consideration in the initial NR frame structure design, as not all NR features are included in the initial phases / releases of NR.

[0034] Reducing protocol latency can be an important improvement between different generations / releases, which can improve efficiency and meet new application requirements (e.g., real-time services). An effective method for reducing latency is to reduce the length of the TTI from 10 milliseconds (ms) in 3G to 1 ms in LTE.

[0035] Backward compatibility may not be required in NR systems. Basic parameters may be adjusted so that reducing the number of symbols in a TTI is not the only way to change the TTI length. In an example associated with LTE basic parameters, 14 orthogonal frequency division multiplexing (OFDM) symbols may be associated with a subcarrier spacing of 1 ms and / or 15 kHz. When the subcarrier spacing is increased to 30 kHz, where the Fast Fourier Transform (FFT) size and / or cyclic prefix (CP) structure may not change, there may be 28 OFDM symbols in 1 ms, and / or if the number of OFDM symbols in a TTI remains the same, the TTI may become 0.5 ms. Therefore, the design between different TTI lengths may be maintained in conjunction with the scalability performed on the subcarrier spacing. One or more of the FFT size, Physical Resource Block (PRB) definition / number, CP design, supportable system bandwidth, subcarrier spacing selection, etc. may be configured to be associated with the subcarrier spacing selection. Since NR is associated with larger system bandwidth and / or larger coherence bandwidth, incorporating larger subcarrier spacing may be beneficial.

[0036] More details on the NR frame structure, channel and / or basic parameter design are provided in 3GPP TS 38.211 V15.7.0. Of note, section 4.3.1 of 3GPP TS 38.211 V15.7.0 titled “Uplink-Downlink Timing Relationship” Figure 4 .3.1-1 is reproduced in this article as Figure 5 One or more sections of 3GPP TS 38.211 V15.7.0 are quoted as follows:

[0037] 4 frame structure and physical resources

[0038] 4.1 General

[0039] Throughout this specification, unless otherwise specified, the size of each field in the time domain is expressed as a time unit T c =1 / (Δf max ·N f ), where Δf max =480·10 3 Hz and N f =4096. Constant k = T s / T c =64, where T s =1 / (Δf ref ·N f,ref ), Δf ref =15·10 3 Hz and N f,ref =2048.

[0040] 4.2 Basic Parameters

[0041] As given in Table 4.2-1, multiple OFDM basic parameters are supported, where μ and the cyclic prefix used for the bandwidth part are obtained from the higher layer parameters subcarrierSpacing and cyclicPrefix respectively.

[0042] Table 4.2-1: Supported basic transmission parameters.

[0043]

[0044]

[0045] 4.3 Frame Structure

[0046] 4.3.1 Frames and Subframes

[0047] Downlink and uplink transmissions are organized into f =(Δf max N f / 100)·T c= 10ms duration frame, each frame consists of T sf =(Δf max N f / 1000)·T c =10 subframes of 1ms duration. The number of consecutive OFDM symbols per subframe is Each frame is divided into two equally sized half-frames of five sub-frames, each with half-frame 0 consisting of sub-frames 0-4 and half-frame 1 consisting of sub-frames 5-9.

[0048] On a carrier, there is a set of frames in the uplink and a set of frames in the downlink.

[0049] The uplink frame number i for transmission from the UE will precede the start of the corresponding downlink frame at the UE by T TA =(N TA +N TA，偏移 )T c Start, where N TA，偏移 Given by [5, TS 38.213].

[0050] Figure 4 .3.1-1: Uplink-downlink timing relationship.

[0051] 4.3.2 Time Slot

[0052] For the subcarrier spacing configuration μ, the time slots are numbered in increasing order within the subframe. and are numbered in increasing order within the frame. Existence in time slot consecutive OFDM symbols, where Depends on the cyclic prefix as given by Tables 4.3.2-1 and 4.3.2-2. Slots in a subframe The beginning of the OFDM symbol in the same subframe The start of is aligned in time.

[0053] The OFDM symbols in a slot can be classified as 'downlink', 'flexible' or 'uplink'. The signalling of the slot format is described in section 11.1 of [5, TS 38.213].

[0054] In a time slot in a downlink frame, the UE shall assume that downlink transmissions occur only in 'downlink' or 'flexible' symbols.

[0055] In a timeslot in an uplink frame, the UE shall transmit only in 'uplink' or 'flexible' symbols.

[0056] A UE that is not capable of full-duplex communication among all cells within a cell group and that does not support simultaneous transmission and reception as defined by the parameters simultaneousRxTxInterBandENDC, simultaneousRxTxInterBandCA or simultaneousRxTxSUL [10, TS 38.306] is expected to transmit in the uplink in one cell within the cell group no earlier than N after the end of the last received downlink symbol in the same or a different cell within the cell group. Rx-Tx T c , where N Rx-Tx Given in Table 4.3.2-3.

[0057] A UE that is not capable of full-duplex communication among all cells within a cell group and that does not support simultaneous transmission and reception as defined by the parameters simultaneousRxTxInterBandENDC, simultaneousRxTxInterBandCA or simultaneousRxTxSUL [10, TS 38.306] is expected to receive in the downlink in one cell within the cell group no earlier than N after the end of the last transmitted uplink symbol in the same or a different cell within the cell group. Tx-Rx T c , where N Tx-Rx Given in Table 4.3.2-3.

[0058] A UE not capable of full-duplex communication is expected to transmit in the uplink no earlier than N times after the end of the last received downlink symbol in the same cell. Rx-Tx T c , where N Rx-Tx Given in Table 4.3.2-3.

[0059] A UE not capable of full-duplex communication is expected to receive in the downlink no earlier than N after the end of the last transmitted uplink symbol in the same cell. Tx-Rx T c , where N Tx-Rx Given in Table 4.3.2-3.

[0060] Table 4.3.2-1: Number of OFDM symbols per slot, slots per frame, and slots per subframe for standard cyclic prefix.

[0061]

[0062] Table 4.3.2-2: Number of OFDM symbols per slot, slots per frame, and slots per subframe for extended cyclic prefix.

[0063]

[0064] Table 4.3.2-3: Transition time N Rx-Tx and N Tx-Rx

[0065] Transition Time FR1 FR2 <![CDATA[N Tx-Rx ]]> 25600 13792 <![CDATA[N Rx-Tx ]]> 25600 13792

[0066] 4.4 Physical Resources

[0067] 4.4.5 Bandwidth

[0068] The bandwidth part is the given basic parameter m in the bandwidth part i on a given carrier in subclause 4.4.4.3 i A subset of contiguous common resource blocks defined. The starting position in the bandwidth section and the number of resource blocks Should satisfy and The configuration of bandwidth parts is described in clause 12 of [5, TS 38.213].

[0069] A UE may be configured with up to four bandwidth parts in the downlink, with a single downlink bandwidth part being active at a given time. The UE is not expected to receive PDSCH, PDCCH, or CSI-RS (except RRM) outside the active bandwidth part.

[0070] A UE may be configured with up to four bandwidth parts in the uplink, with a single uplink bandwidth part active at a given time. If a UE is configured with a supplemental uplink, the UE may additionally be configured with up to four bandwidth parts in the supplemental uplink, with a single supplemental uplink bandwidth part active at a given time. The UE shall not transmit PUSCH or PUCCH outside the active bandwidth part. For an active cell, the UE shall not transmit SRS outside the active bandwidth part.

[0071] Unless otherwise stated, the description in this specification applies to each of the bandwidth parts. When there is no risk of aliasing, the index μ can be obtained from Omit.

[0072] When accessing an unlicensed spectrum (e.g., a shared spectrum), one or more mechanisms may be needed to determine whether a device (e.g., a UE and / or a base station, such as an access node) can access the unlicensed spectrum (e.g., whether the device can perform a transmission, such as a transmission in the unlicensed spectrum) (e.g., to ensure fairness for some and / or all devices on the unlicensed spectrum). For example, a device may detect and / or receive signals on the unlicensed spectrum (e.g., on a serving cell associated with the unlicensed spectrum) to determine (e.g., determine) whether the spectrum is available. In some instances, when the device detects nothing and / or silence (e.g., for a certain period of time), the device may deem the unlicensed spectrum available and / or may perform a transmission (e.g., a transmission in the unlicensed spectrum). On the other hand, when the device detects one or more signals on the spectrum (e.g., one or more signals from one or more other devices having one or more strengths exceeding a threshold), the device may deem the spectrum currently occupied and may delay (e.g., postpone) the device's transmission. This mechanism may be referred to as listen before talk (LBT). There may be one or more additional aspects regarding how to implement LBT, such as a threshold for a device to determine (e.g., judge) whether a channel is currently occupied (e.g., the device may consider a signal with a strength less than a threshold to be silent), how long the device performs detection, and / or how to proceed after the device fails an LBT test (e.g., when to perform another detection test and / or how to perform another detection test). Further details of the channel access scheme can be found in one or more sections of the draft 3GPP TS 37.213 V16.4.0 cited below:

[0073] 4-channel access procedure

[0074] 4.0 General Provisions

[0075] Unless otherwise indicated, the following definitions apply to the following terms used in this specification:

[0076] - A channel refers to a carrier or a portion of a carrier, consisting of a set of contiguous resource blocks (RBs) on which a channel access procedure is performed in a shared spectrum.

[0077] - The channel access procedure is a sensing-based procedure that assesses the availability of a channel for performing transmissions. The basic unit for sensing is a sensing slot, which has a duration T sl =9us. If the eNB / gNB or UE senses the channel during the sensing slot duration and determines that the detected power is less than the energy detection threshold X for at least 4us during the sensing slot duration 阈值 , then the sensing time slot duration T slOtherwise, the sensing time slot duration T sl Considered busy.

[0078] -Channel occupancy refers to the transmission of the eNB / gNB / UE on the channel after performing the corresponding channel access procedures in this section.

[0079] - Channel occupancy time refers to the total time that the eNB / gNB / UE and any eNB / gNB / UE sharing the channel transmit on the channel after the eNB / gNB / UE performs the corresponding channel access procedures described in this clause. To determine the channel occupancy time, if a transmission gap is less than or equal to 25 μs, the gap duration is counted as the channel occupancy time. The channel occupancy time can be shared for transmissions between the eNB / gNB and the corresponding UE.

[0080] A DL transmit 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 greater than 16µs are considered separate DL transmit bursts. The eNB / gNB may transmit after a gap within a DL transmit burst without sensing the availability of the corresponding channel.

[0081] An UL transmit burst is defined as a set of transmissions from a UE that do not have any gaps greater than 16 us. Transmissions from a UE separated by gaps greater than 16 us are considered separate UL transmit bursts. A UE may transmit after a gap within an UL transmit burst without sensing the availability of the corresponding channel.

[0082] A discovery burst refers to a DL transmission burst that includes a set of signals and / or channels that are restricted within a window and associated with a duty cycle. A discovery burst may be any of the following:

[0083] - Transmissions initiated by the eNB, which include the Primary Synchronization Signal (PSS), the Secondary Synchronization Signal (SSS), and the Cell-Specific Reference Signal (CRS) and may include a non-zero power CSI Reference Signal (CSI-RS).

[0084] - A transmission initiated by the gNB, which includes at least an SS / PBCH block consisting of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH) with associated demodulation reference signal (DM-RS), and may also include a CORESET for PDCCH scheduling PDSCH with SIB1, and PDSCH carrying SIB1 and / or non-zero power CSI reference signal (CSI-RS).

[0085] 4.1 Downlink Channel Access Procedure

[0086] The eNB operating an LAA Scell ​​on the channel and the gNB performing transmission on the channel shall perform the channel access procedure described in this clause for accessing the channel on which transmission is performed.

[0087] In this clause, adjust the X used for sensing as described in clause 4.1.5, where applicable. 阈值 .

[0088] The gNB performs the channel access procedures in this clause unless the higher layer parameter ChannelAccessMode-r16 is provided and ChannelAccessMode-r16 = 'semi-static'.

[0089] 4.1.1 Type 1 DL channel access procedure

[0090] This clause describes the channel access procedure to be performed by the eNB / gNB where the duration of the sensing slots sensed as idle prior to a downlink transmission is random. This clause applies to the following transmissions:

[0091] - transmissions initiated by the eNB containing PDSCH / PDCCH / EPDCCH, or

[0092] - a transmission initiated by the gNB containing a unicast PDSCH with user plane data, or a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data, or

[0093] - A transmission initiated by the gNB with only a discovery burst or with a discovery burst multiplexed with non-unicast information, where the transmission duration is greater than 1 ms or the transmission causes a discovery burst duty cycle exceeding 1 / 20.

[0094] The eNB / gNB can postpone for a period of time T d The transmission is transmitted after the channel is sensed as idle for the first time during the sensing slot duration of t and after the counter N is zero in step 4. The counter N is adjusted by sensing the channel for additional sensing slot durations according to the following steps:

[0095] 1) Set N = N init , where N init It is 0 and CW p A random number uniformly distributed between and goes to step 4;

[0096] 2) If N > 0 and the eNB / gNB chooses to decrement the counter, then set N = N - 1;

[0097] 3) Sense the channel in the additional sensing slot duration, and if the additional sensing slot duration is idle, go to step 4; otherwise, go to step 5;

[0098] 4) If N=0, then stop; otherwise, go to step 2.

[0099] 5) Sense the channel until the additional delay duration T d A busy sensing time slot is detected or an additional delay duration T is detected d All sensing time slots are idle;

[0100] 6) If the additional delay duration T d If the channel is sensed to be idle during all sensing time slot durations, then go to step 4; otherwise, go to step 5;

[0101] If the eNB / gNB has not yet transmitted after step 4 in the above procedure, if the eNB / gNB is ready to transmit for at least the duration of the sensing slot T sl The channel is sensed as idle and if the delay duration T immediately preceding this transmission d If the channel has been sensed as idle during all sensing slot durations of T, then the eNB / gNB may transmit on the channel. If the channel has not been sensed idle for the slot duration when the eNB / gNB first senses the channel after the eNB / gNB is ready to transmit, or if the channel is not sensed idle for the delay duration T immediately before the scheduled transmission, then the eNB / gNB may transmit on the channel. d Any sensing time slot duration T sl If the channel is not sensed to be idle during the delay period T d After sensing that the channel is idle during the sensing slot duration, the eNB / gNB proceeds to step 1.

[0102] Delay duration T d By duration T f = 16us and m p The duration of the continuous sensing time slot is T sl Composition, and T f Included in T f The idle sensing time slot duration T at the beginning of sl .

[0103] CW min，p ≤CW p ≤CW max，p It is a competition window. CW p Adjustments are described in clause 4.1.4.

[0104] CW min，p and The CW max，p is selected before step 1 of the above procedure.

[0105] m p 、CWmin，p and The CW max，p is based on the channel access priority class p associated with the eNB / gNB transmission, as shown in Table 4.1.1-1.

[0106] eNB / gNB should not exceed T mcot，p transmit on the channel during the channel occupancy time of the eNB / gNB, where the channel access procedure is performed based on the channel access priority class p associated with the eNB / gNB transmission as given in Table 4.1.1-1.

[0107] If the eNB / gNB transmits a discovery burst as described in clause 4.1.2 when N>0 in the above procedure, the eNB / gNB shall not decrement N during the sensing slot duration that overlaps with the discovery burst.

[0108] The gNB may transmit a transmission containing a discovery burst using any channel access priority class that meets the conditions described in this clause for performing the above procedure.

[0109] The gNB shall use the channel access priority class applicable to unicast user plane data multiplexed in the PDSCH for performing the above procedure for transmissions containing unicast PDSCH with user plane data.

[0110] For p=3 and p=4, if it can be guaranteed (eg by regulatory levels) that there are no other technologies sharing the channel in the long term, then T mcot，p =10ms, otherwise T mcot，p =8ms.

[0111] Table 4.1.1-1: Channel Access Priority Class (CAPC)

[0112]

[0113] 4.1.1.1 Regional restrictions on channel occupancy time

[0114] In Japan, if the eNB / gNB has transmitted after N=0 in step 4 of the above procedure, the eNB / gNB may transmit after at least T js = After the channel is sensed to be idle in the sensing interval of 34us and if the total sensing and transmission time is not greater than Then immediately at the maximum T j =4ms duration to transmit the next continuous transmission. Sensing interval T js By duration T f =16us and two sensing time slots immediately following it, and T f Included in T f The idle sensing time slot at the beginning of the sensing time slot. If the sensing time slot duration T jsIf the channel is idle during T js Idle.

[0115] 4.1.2 Type 2 DL channel access procedure

[0116] This clause describes the channel access procedure to be performed by the eNB / gNB where the duration spanned by the sensing timeslot that is sensed as idle before downlink transmission is deterministic.

[0117] If the eNB performs a Type 2 DL channel access procedure, it follows the procedure described in clause 4.1.2.1.

[0118] The Type 2A channel access procedure as described in clause 4.1.2.1 applies to the following transmissions performed by the eNB / gNB:

[0119] - a transmission initiated by the eNB, which includes a discovery burst and does not include PDSCH, where the transmission duration is at most 1 ms, or

[0120] - a transmission initiated by the gNB with only a discovery burst or with a discovery burst multiplexed with non-unicast information, where the transmission duration is at most 1ms and the discovery burst duty cycle is at most 1 / 20, or

[0121] - After the UE's transmission, the eNB / gNB's transmission follows a 25 us gap in shared channel occupancy as described in clause 4.1.3.

[0122] The Type 2B or Type 2C DL channel access procedure as described in clauses 4.1.2.2 and 4.1.2.3, respectively, applies to transmissions performed by the gNB after a gap of 16 us or at most 16 us, respectively, in the shared channel occupancy as described in clause 4.1.3 following the UE's transmission.

[0123] 4.1.2.1 Type 2A DL channel access procedure

[0124] The eNB / gNB may sense at least the interval T short_dl = 25us after sensing that the channel is idle, immediately transmit DL transmission. short_dl By duration T f = 16us and a sensing time slot immediately following it, and T f Included in T f The sensing time slot at the beginning of the short_dl If the two sensing time slots of T are sensed as idle, then the channel is considered to be in T short_dl Idle.

[0125] 4.1.2.2 Type 2B DL ​​channel access procedure

[0126] gNB can be used in T f =16us duration after sensing that the channel is idle. f Included in T f If the channel is sensed idle for at least 5 us in total with at least 4 us of sensing occurring in the sensing slot, then the channel is considered idle for duration T f Internal free time.

[0127] 4.1.2.3 Type 2C DL channel access procedure

[0128] When the gNB follows the procedures in this clause for transmitting a DL transmission, the gNB does not sense the channel before transmitting the DL transmission. The duration of the corresponding DL transmission is at most 584 μs.

[0129] 4.1.3 DL channel access procedure during shared channel occupation

[0130] If the gNB uses the channel access procedure described in clause 4.2.1.1 on a channel sharing the channel occupation initiated by the UE, the gNB may transmit a transmission following an UL transmission on the scheduled resources or a PUSCH transmission on the resources configured by the UE after the gap as follows:

[0131] - The transmission shall contain transmission to the UE that initiated the channel occupation and may include non-unicast and / or unicast transmissions, wherein any unicast transmission including user plane data is only transmitted to the UE that initiated the channel occupation.

[0132] - If the higher layer parameter ul-toDL-COT-SharingED-Threshold-r16 is not provided, then the transmission shall not contain any unicast transmission with user plane data and the transmission duration shall not exceed the duration of 2, 4 and 8 symbols for the subcarrier spacing of 15, 30 and 60 kHz respectively for the corresponding channel.

[0133] - If the gap is at most 16 us, the gNB may transmit on the channel after performing Type 2C DL channel access as described in clause 4.1.2.3.

[0134] If the gap is 25 us or 16 us, the gNB may transmit on the channel after performing the Type 2A or Type 2B DL ​​channel access procedure as described in clauses 4.1.2.1 and 4.1.2.2, respectively.

[0135] For the case where the gNB shares channel occupancy initiated by a UE with a configured grant for PUSCH transmission, the gNB may transmit a transmission following the UE's configured grant for PUSCH transmission as follows:

[0136] - If the higher layer parameter ul-toDL-COT-SharingED-Threshold-r16 is provided, then the UE is configured by cg-COT-SharingList-r16, where cg-COT-SharingList-r16 provides a table configured by higher layers. Each row of the table provides channel occupancy sharing information given by the higher layer parameter CG-COT-Sharing-r16. One row of the table is configured to indicate that channel occupancy sharing is not available.

[0137] - If the 'COT Sharing Information' in the CG-UCI detected in slot n indicates a row index corresponding to CG-COT-Sharing-r16 providing channel occupancy sharing information, then the gNB may share UE channel occupancy, assuming a channel access priority class p = channelAccessPriority-r16, starting from slot n + O, where O = offset-r16 slots, for a duration of D = duration-r16, where duration-r16, offset-r16 and channelAccessPriority-r16 are higher layer parameters provided by CG-COT-Sharing-r16.

[0138] If the higher layer parameter ul-toDL-COT-SharingED-Threshold-r16 is not provided, and if the 'COT Sharing Information' in the CG-UCI indicates '1', the gNB may share the UE channel occupancy and start DL transmissions for X = cg-COT-SharingOffset-r16 symbols from the end of the slot in which the CG-UCI is detected, where cg-COT-SharingOffset-r16 is provided by higher layers. The transmissions shall not include any unicast transmissions with user plane data, the transmission duration of which shall not exceed the duration of 2, 4, and 8 symbols for the subcarrier spacing of 15, 30, and 60 kHz, respectively, for the corresponding channel.

[0139] For the case where the gNB initiates a transmission using the channel access procedure as described in clause 4.1.1 and shares the corresponding channel occupancy with the UE transmitting the transmission as described in clause 4.2.1.2, the gNB may transmit a transmission following the UE's transmission within its channel occupancy, provided that any gap between any two transmissions in the gNB's channel occupancy is at most 25 µs. In this case the following applies:

[0140] If the gap is 25 us or 16 us, the gNB may transmit on the channel after performing the Type 2A or 2B DL ​​channel access procedure as described in clauses 4.1.2.1 and 4.1.2.2, respectively.

[0141] - If the gap is at most 16 us, the gNB may transmit on the channel after performing Type 2C DL channel access as described in clause 4.1.2.3.

[0142] 4.1.4 Competition Window Adjustment Procedure

[0143] If the eNB / gNB transmits transmissions containing PDSCH associated with channel access priority class p on a channel, the eNB / gNB maintains a contention window value CW for those transmissions as described in this clause p and adjust CW before step 1 of the procedure described in clause 4.1.1 p .

[0144] 4.1.4.2 Contention Window Adjustment Procedure for DL ​​Transmissions of gNB

[0145] If the gNB transmits transmissions containing PDSCH associated with channel access priority class p on a channel, the gNB maintains a contention window value CW for those transmissions p , and adjust the CW using the following steps before step 1 of the procedure described in clause 4.1.1 p :

[0146] 1) For each priority class p∈{1, 2, 3, 4}, set CW p =CW min , p .

[0147] 2) If on CW p If HARQ-ACK feedback is available after the last update of , then go to step 3. Otherwise, if the gNB transmission after the procedure described in clause 4.1.1 does not include retransmissions or p The duration T from the end of the reference duration corresponding to the earliest DL channel occupancy after the last update w If the transmission is in progress, go to step 5; otherwise go to step 4.

[0148] 3) HARQ-ACK Feedback The HARQ-ACK feedback corresponding to the PDSCH in the reference duration of its latest available DL channel occupancy is used as follows:

[0149] a. If at least one HARQ-ACK feedback is 'ACK' for a PDSCH with transport block based feedback or at least 10% of the HARQ-ACK feedback is 'ACK' for PDSCH CBGs at least partially transmitted on a channel with code block group based feedback, then go to step 1; otherwise, go to step 4.

[0150] 4) The CW for each priority class p∈{1, 2, 3, 4} p Increase to the next higher allowed value.

[0151] 5) For each priority class p∈{1, 2, 3, 4}, maintain CW p No change; go to step 2.

[0152] The reference duration and duration T in the above procedure w Defined as follows:

[0153] The reference duration corresponding to a gNB-initiated channel occupation containing a PDSCH transmission is defined in this clause as the duration starting from the start of the channel occupation until the end of the first slot in which at least one unicast PDSCH is transmitted on all resources allocated for the PDSCH, or until the end of the gNB's first transmission burst containing a unicast PDSCH transmitted on all resources allocated for the PDSCH, whichever occurs first. If the channel occupation contains a unicast PDSCH, but it does not contain any unicast PDSCH transmitted on all resources allocated for the PDSCH, then the duration of the gNB's first transmission burst within the channel occupation containing the unicast PDSCH is the reference duration for CWS adjustment.

[0154] -T w =max(T A , T B +1ms), where T B is the duration of the transmit burst in ms from the start of the reference duration, and if there is no long-term guarantee (eg by regulatory levels) that there are no other technologies sharing the channel, then T A =5ms, otherwise T A =10ms.

[0155] If the gNB transmits a transmission on a channel using a Type 1 channel access procedure associated with channel access priority class p and the transmission is not associated with explicit HARQ-ACK feedback for the corresponding UE, the gNB uses the latest CW for any DL transmission on the channel using a Type 1 channel access procedure associated with channel access priority class p p , adjust CW before step 1 of the procedure described in subclause 4.1.1 pIf the corresponding channel access priority class p has not been used for any DL transmission on the channel, then CW p =CW min，p .

[0156] 4.1.4.3 Common procedures for CWS adjustment for DL ​​transmissions

[0157] The following applies to the procedures described in clauses 4.1.4.1 and 4.1.4.2:

[0158] -If CW p =CW max，p , then used to adjust CW p The next higher allowed value is CW max，p .

[0159] -If CW p =CW max，p Use K times in succession to generate N init , then only for CW p =CW max，p Use K times in succession to generate N init The priority class pp will be CW p Reset to CW min，p K is selected by the eNB / gNB from the value set {1, 2, ..., 8} for each priority class p∈{1, 2, 3, 4}.

[0160] 4.1.5 Energy Detection Threshold Adaptation Procedure

[0161] The eNB / gNB accessing the channel to perform transmission shall set the energy detection threshold (X 阈值 ) is less than or equal to the maximum energy detection threshold X Thresh_max .

[0162] X Thresh_max Determine as follows:

[0163] - If there is a long-term guarantee (e.g. at the regulatory level) that there will not be any other technology sharing the channel, then:

[0164] -

[0165] -X r is the maximum energy detection threshold in dBm defined by regulatory requirements when those requirements are defined, otherwise X r =T max +10dB;

[0166] -otherwise,

[0167] -

[0168]

[0169] in:

[0170] - For transmissions containing discovery bursts as described in clause 4.1.2, T A =5dB, otherwise T A =10dB;

[0171] -P H =23dBm;

[0172] -P TX is the set maximum eNB / gNB output power in dBm for the channel;

[0173] - Regardless of whether single-channel or multi-channel transmission is used, the eNB / gNB uses a set maximum transmit power on a single channel

[0174] -T max (dBm)=10·log 10(3.16228·10 -8 (mW / MHz)·BWMHz(MHz));

[0175] - BWMHz is the single channel bandwidth in MHz.

[0176] 4.2 Uplink Channel Access Procedure

[0177] A UE transmitting on an LAA Scell, an eNB scheduling or configuring UL transmission for a UE transmitting on an LAA Scell, and a UE transmitting on a channel and a gNB scheduling or configuring UL transmission for a UE transmitting on a channel shall perform the procedures described in this clause for the UE to access the channel on which the transmission is performed.

[0178] In this clause, transmissions from a UE are considered separate UL transmissions, regardless of whether there are gaps between transmissions, and X for sensing is adjusted as described in clause 4.2.3, if applicable. 阈值 .

[0179] The UE performs the channel access procedure in this clause unless the higher layer parameter ChannelAccessMode-r16 is provided and ChannelAccessMode-r16 = 'semi-static'.

[0180] If the UE fails to access the channel before the scheduled UL transmission to the gNB, Layer 1 notifies higher layers of the channel access failure.

[0181] 4.2.1 Channel access procedure for uplink transmission

[0182] The UE may access the channel for performing UL transmission according to one of the Type 1 or Type 2 UL channel access procedures. The Type 1 channel access procedure is described in clause 4.2.1.1. The Type 2 channel access procedure is described in clause 4.2.1.2.

[0183] If the UL grant scheduling a PUSCH transmission indicates a Type 1 channel access procedure, the UE shall use the Type 1 channel access procedure for transmissions including PUSCH transmissions, unless otherwise specified in this clause.

[0184] The UE shall use Type 1 channel access procedure for transmissions on configured UL resources including autonomous or configured grant PUSCH transmissions, unless otherwise specified in this clause.

[0185] If the UL grant scheduling a PUSCH transmission indicates a Type 2 channel access procedure, the UE shall use the Type 2 channel access procedure for transmitting transmissions including the PUSCH transmission, unless otherwise specified in this clause.

[0186] The UE shall use Type 1 channel access procedure for SRS transmissions not including PUSCH transmissions. UL channel access priority class p=1 in Table 4.2.1-1 is for SRS transmissions not including PUSCH.

[0187] If a DL assignment that triggers SRS but does not schedule PUCCH transmission indicates a Type 2 channel access procedure, the UE shall use the Type 2 channel access procedure.

[0188] If a UE is scheduled by the eNB / gNB to transmit PUSCH and SRS in contiguous transmissions without any gaps in between, and if the UE is unable to access the channel used for PUSCH transmission, then the UE shall attempt to make SRS transmissions according to the uplink channel access procedure specified for SRS transmissions.

[0189] If a UE is scheduled by a gNB to transmit a PUSCH and one or more SRSs in a non-contiguous transmission with a single UL grant, or if a UE is scheduled by a gNB to transmit a PUCCH and / or SRS in a non-contiguous transmission with a single DL assignment, the UE shall use the channel access procedure indicated by the scheduling DCI for the first UL transmission scheduled by the scheduling DCI. If the UE senses that the channel is continuously idle after the UE has stopped transmitting the first transmission, the UE may use a Type 2 channel access procedure or a Type 2A UL channel access procedure to transmit the other UL transmissions scheduled by the scheduling DCI without applying CP extension, provided that the other UL transmissions are within the gNB channel occupancy time. Otherwise, if the UE senses that the channel is not continuously idle after the UE has stopped transmitting the first UL transmission or the other UL transmissions are outside the gNB channel occupancy time, the UE may use a Type 1 channel access procedure to transmit the other UL transmissions without applying CP extension.

[0190] The UE shall use Type 1 channel access procedure for PUCCH transmission unless otherwise specified in this clause. If the DL grant determined according to clause 9.2.3 of [7, TS 38.213] or the Random Access Response (RAR) message of the successRAR for scheduled PUCCH transmission indicates Type 2 channel access procedure, the UE shall use Type 2 channel access procedure.

[0191] When the UE uses Type 1 channel access procedure for PUCCH transmission or PUSCH-only transmission without UL-SCH, the UE shall use UL channel access priority class p=1 in Table 4.2.1-1.

[0192] The UE shall use the Type 1 channel access procedure for PRACH transmissions and PUSCH transmissions where there is no user plane data associated with the random access procedure that initiated the channel occupation. In this case, the UL channel access priority class p=1 in Table 4.2.1-1 is used for PRACH transmissions and the UL channel access priority class for PUSCH transmissions is determined according to clause 5.6.2 of [9].

[0193] When the UE uses the Type 1 channel access procedure for PUSCH transmission on configured resources, the UE determines the corresponding UL channel access priority p in Table 4.2.1-1 following the procedure described in clause 5.6.2 of [9].

[0194] When the UE uses the Type 1 channel access procedure for PUSCH transmission of user plane data with indication by UL grant or associated with a random access procedure in which the corresponding UL channel access priority p is not indicated, the UE determines p in Table 4.2.1-1 following the same procedure as for PUSCH transmission on configured resources using the Type 1 channel access procedure.

[0195] When the UE uses Type 2A, Type 2B or Type 2C UL channel access procedure for PUSCH transmission indicated by an UL grant or associated with a random access procedure in which the corresponding UL channel access priority class p is not indicated, the UE assumes that the gNB uses channel access priority class p = 4 during the channel occupancy time.

[0196] UE should not exceed T ulmcot，p The UE transmits on the channel during the channel occupancy time, where the channel access procedure is performed based on the channel access priority class p associated with the UE transmission, as given in Table 4.2.1-1.

[0197] If the UE sets the 'COT sharing indication' in the AUL-UCI to '1' in a subframe within an autonomous uplink transmission as described in clause 4.1.3, including subsequent DL transmissions, the total channel occupancy time of the autonomous uplink transmission obtained through the channel access procedure in this clause shall not exceed T ulmcot，p , where T ulmcot，p Given in Table 4.2.1-1.

[0198] Table 4.2.1-1: Channel Access Priority Class (CAPC) for UL

[0199]

[0200]

[0201] 4.2.1.0 Channel Access Procedure and UL Related Signaling

[0202] 4.2.1.0.0 Channel Access Procedure After Detecting Common DCI

[0203] If the UE detects the 'UL Duration and Offset' field in DCI format 1C as described in clause 5.3.3.1.4 of [5], the following applies:

[0204] - If the 'UL Duration and Offset' field indicates 'UL Offset' l and 'UL Duration' d for subframe n, then the scheduled UE may use channel access procedure Type 2 for transmissions in subframes n+l+i, where i = 0, 1, ... d-1, regardless of the channel access type sent in the UL grant for those subframes, provided that the end of the UE transmission occurs in or before subframe n+l+d-1.

[0205] - If the 'UL Duration and Offset' field indicates 'UL Offset' l and 'UL Duration' d for subframe n, and the 'COT Sharing Indication for AUL' field is set to '1', then a UE configured with autonomous UL may use channel access procedure Type 2 for autonomous UL transmission of any priority class in subframe n+l+i, where i = 0, 1, ... d-1, provided that the end of the UE's 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 shall be contiguous.

[0206] - If the 'UL Duration and Offset' field indicates '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 shall not transmit autonomous UL in subframe n+l+i, where i=0, 1, ...d-1.

[0207] If the UE determines the duration in the time domain and the position in the frequency domain of the remaining channel occupancy initiated by the gNB according to DCI format 2_0 as described in clause 11.1.1 of [7], the following may apply:

[0208] - The UE may switch from the Type 1 channel access procedure as described in clause 4.2.1.1 to the Type 2A channel access procedure as described in clause 4.2.1.2.1 for its corresponding UL transmission within the determined duration in the time domain and location in the frequency domain of the remaining channel occupancy. In this case, if the UL transmission is a PUSCH transmission on configured resources, the UE may adopt any priority class for channel occupancy shared with the gNB.

[0209] 4.2.1.0.1 Channel Access Procedure for Continuous UL Transmission

[0210] For continuous UL transmission, the following applies:

[0211] - If the UE is scheduled to transmit a UL transmission set containing a PUSCH using an UL grant, and if the UE is unable to access the channel used for transmissions in the set before the last transmission according to one of the Type 1, Type 2, or Type 2A UL channel access procedures, then the UE shall attempt to transmit the next transmission according to the channel access type indicated in the UL grant. Otherwise, if the UE is unable to access the channel used for transmissions in the set before the last transmission according to the Type 2B UL channel access procedure, then the UE shall attempt to transmit the next transmission according to the Type 2A UL channel access procedure.

[0212] If a UE is scheduled by the gNB to transmit a set of UL transmissions containing PUSCH or SRS symbols using an UL grant, the UE shall not apply CP extension for the remaining UL transmissions in the set after the first UL transmission after the access channel.

[0213] -If a UE is scheduled to transmit a set of consecutive UL transmissions without gaps, including PUSCH with one or more UL grants, PUCCH with one or more DL grants, or SRS with one or more DL grants or UL grants, and the UE transmits one of the scheduled UL transmissions in the set after accessing the channel according to one of the Type 1, Type 2, Type 2A, Type 2B, or Type 2C UL channel access procedures, then the UE may continue transmission of the remaining UL transmissions in the set (if any).

[0214] If the UE is configured to transmit a set of consecutive PUSCH or SRS transmissions on resources configured by the gNB, the time domain resource configuration defines multiple transmission opportunities, and if the UE is unable to access the channel according to the Type 1 UL channel access procedure for transmission in a transmission opportunity before the last transmission opportunity, then the UE shall attempt to transmit in the next transmission opportunity according to the Type 1 UL channel access procedure. If the UE transmits in one of the multiple transmission opportunities after accessing the channel according to the Type 1 UL channel access procedure, then the UE may continue to transmit in the remaining transmission opportunities in the set, where each transmission opportunity starts at the start symbol of a configured grant PUSCH within the duration of the COT.

[0215] If a UE is configured by the gNB to transmit a set of consecutive UL transmissions without gaps, including PUSCH, periodic PUCCH, or periodic SRS, and the UE transmits one of the configured UL transmissions in the set after accessing the channel according to the Type 1 UL channel access procedure, the UE may continue transmission of the remaining UL transmissions in the set (if any).

[0216] - The UE is not expected to be indicated different channel access types for any consecutive UL transmissions with no gaps between transmissions, except when a Type 2B or Type 2C UL channel access procedure is identified for the first of the consecutive UL transmissions.

[0217] For continuous UL transmissions including pauses in transmissions, the following applies:

[0218] -If the UE is scheduled to transmit a set of consecutive UL transmissions without gaps using one or more UL grants, 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 the channel to be continuously idle after the UE has stopped transmitting, then the UE may transmit the later UL transmission in the set using a Type 2 channel access procedure or a Type 2A UL channel access procedure without applying CP extension.

[0219] - If the UE senses that the channel is discontinuously idle after the UE has stopped transmitting, the UE may transmit a later UL transmission in the set using a Type 1 channel access procedure, where the UL channel access priority class is indicated in the DCI corresponding to the UL transmission.

[0220] For a UL transmission following a configured grant UL transmission, the following applies:

[0221] If a UE is scheduled to transmit an UL transmission starting from symbol i in slot n using a Type 1 channel access procedure without a CP extension with a corresponding CAPC, and if the UE begins a configured UL transmission using a Type 1 channel access procedure with a corresponding CAPC before symbol i in slot n, and the scheduled UL transmission occupies all RBs, or a subset of all RBs, of the same channel occupied by the configured UL transmission, then the UE may continue transmitting the scheduled UL transmission directly from symbol i in slot n to the corresponding CAPC without gaps, provided that the CAPC value of the channel access procedure performed is greater than or equal to the CAPC value corresponding to the scheduled UL transmission. The sum of the transmission durations of the configured UL transmission and the scheduled UL transmission shall not exceed the MCOT duration corresponding to the CAPC value used to transmit the configured UL transmission. Otherwise, the UE shall terminate the configured UL transmission by discarding transmissions on at least the symbol of the last configured UL transmission before symbol i in slot n, and attempt to transmit the scheduled UL transmission according to the corresponding CAPC. Symbols with configured grant PUSCH transmissions in the slot are discarded according to the mechanism in clause 11.1 of [7, TS 38.213] relative to the last symbol of the CORESET in which the UE detects the scheduling DCI. In this case, if the UE cannot terminate the configured grant UL transmission, then the UE ignores the scheduling DCI.

[0222] 4.2.1.0.2 Conditions for maintaining Type 1 UL channel access procedures

[0223] If the UE receives a UL grant indicating that PUSCH transmission is scheduled using Type 1 channel access procedure or a DCI indicating that PUCCH transmission is scheduled using Type 1 channel access procedure, and if the UE has an ongoing Type 1 channel access procedure before the PUSCH or PUCCH transmission start time:

[0224] -If the UL channel access priority class value p1 for the ongoing type 1 channel access procedure is equal to or greater than the UL channel access priority class value p2 indicated in the DCI, the UE may transmit a PUSCH transmission in response to the UL grant by accessing the channel using the ongoing type 1 channel access procedure.

[0225] - If the UL channel access priority class value p1 for an ongoing Type 1 channel access procedure is less than the UL channel access priority class value p2 indicated in the DCI, the UE shall terminate the ongoing channel access procedure.

[0226] - The UE may transmit a PUCCH transmission in response to a DL grant by using an ongoing type 1 channel access procedure and by accessing the channel.

[0227] 4.2.1.0.3 Conditions for indicating Type 2 channel access procedures

[0228] The eNB / gNB may indicate the Type 2 channel access procedure in the DCI scheduled for transmission containing an UL grant or DL ​​assignment for PUSCH or PUCCH, respectively, on the channel as follows:

[0229] If the UL transmission occurs starting at t0 and at t0+T CO The end of the time interval, where

[0230] -T CO =T mcot，p +T g ,

[0231] - t0 is the moment when the eNB / gNB starts transmitting on the carrier according to the channel access procedure described in clause 4.1.1,

[0232] -T mcot，p The value is determined by the eNB / gNB as described in clause 4.1.1,

[0233] -T g is the total duration of all gaps with a duration greater than 25 us occurring between a DL transmission of the eNB / gNB and an UL transmission scheduled by the eNB / gNB and between any two UL transmissions scheduled by the eNB / gNB starting from t0,

[0234] So,

[0235] - If the eNB / gNB has transmitted on the channel according to the channel access procedure described in clause 4.1.1, the eNB / gNB may indicate the Type 2 channel access procedure in the DCI, or

[0236] - The eNB / gNB may schedule an UL transmission on the channel after a duration of 25 us following the eNB / gNB's transmission on said channel with a Type 2A channel access procedure for UL transmission, as described in clause 4.2.1.2.1.

[0237] eNB / gNB should be between t0 and t0+T CO UL transmissions are scheduled between UEs without gaps between consecutive UL transmissions, provided that they can be scheduled consecutively. For UL transmissions on a channel that follows a transmission on which the eNB / gNB uses a Type 2A channel access procedure on that channel, the UE may use a Type 2A channel access procedure for UL transmissions as described in clause 4.2.1.2.1.

[0238] If the eNB / gNB indicates a Type 2 channel access procedure for the UE in the DCI, the eNB / gNB indicates in the DCI the channel access priority class to be used to obtain access to the channel.

[0239] To indicate a Type 2 channel access procedure, if the gap is at least 25 us, or equal to 16 us, or at most 16 us, then the gNB may indicate a Type 2A or Type 2B or Type 2C UL channel procedure, respectively, as described in clause 4.2.1.2.

[0240] 4.2.1.0.4 Channel Access Procedure for UL Multi-Channel Transmission

[0241] If UE

[0242] - is scheduled to transmit on channel set C, and if a Type 1 channel access procedure is indicated by a UL scheduling grant for a UL transmission on said channel set C, and if the UL transmission is scheduled to start transmission simultaneously on all channels in said channel set C, or

[0243] - an uplink transmission is intended to be performed on configured resources on a channel set C with a type 1 channel access procedure, and if the UL transmission is configured to start transmission simultaneously on all channels in said channel set C, and

[0244] If the channel frequencies of channel set C are a subset of one of the set of channel frequencies defined in clause 5.7.4 in [2]

[0245] - The UE may use the Type 2 channel access procedure as described in clause 4.2.1.2 on channel ci ∈C is transmitted,

[0246] - If immediately following channel c j UE on ∈C transmits on channel c i Type 2 channel access procedure is performed on i≠j, and

[0247] - If the UE has accessed channel c using the Type 1 channel access procedure as described in clause 4.2.1.1 j ,

[0248] - wherein channel c is uniformly randomly selected by the UE from channel set C before performing a type 1 channel access procedure on any channel in channel set C j .

[0249] - If the UE fails to access any of the channels of the carrier bandwidth on which the UE is scheduled or configured with UL resources, the UE cannot access the channels within the carrier bandwidth c i ∈C is transmitted.

[0250] 4.2.1.1 Type 1 UL Channel Access Procedure

[0251] This clause describes the channel access procedure to be performed by the UE where the duration of the sensing slots sensed as idle prior to an UL transmission is random. The clause applies to the following transmissions:

[0252] - PUSCH / SRS transmission scheduled or configured by the eNB / gNB, or

[0253] - transmitted via PUCCH scheduled or configured by the gNB, or

[0254] - Transmissions related to the random access procedure.

[0255] The UE can postpone for a duration T d After the channel is first sensed as idle during the time slot duration of t and after the counter N is zero in step 4, the transmission is transmitted using the Type 1 channel access procedure.

[0256] The counter N is adjusted by sensing the channel for the additional time slot duration according to the steps described below:

[0257] 1) Set N = N init , where N init It is 0 and CW p A random number uniformly distributed between and goes to step 4;

[0258] 2) If N>0 and the UE chooses to decrement the counter, then set N=N-1;

[0259] 3) Sense the channel in the extra slot duration, and if the extra slot duration is idle, go to step 4; otherwise, go to step 5;

[0260] 4) If N=0, then stop; otherwise, go to step 2.

[0261] 5) Sense the channel until the additional delay duration T d A busy slot is detected within the time limit or an additional delay duration T is detected d All time slots of are idle;

[0262] 6) If the additional delay duration T d If the channel is sensed to be idle during all time slot durations of , then go to step 4; otherwise, go to step 5;

[0263] If the UE has not yet transmitted an UL transmission on the channel on which the UL transmission is performed after step 4 in the above procedure, if the UE is ready to transmit for at least the duration of the sensing slot T sl The channel is sensed as idle and if the delay duration T immediately preceding this transmission d If the channel has been sensed as idle during all time slot durations of T, then the UE may transmit on the channel. If the UE first senses the channel after it is ready to transmit, then the UE may transmit on the channel during the sensing time slot duration T. sl The channel has not been sensed to be idle in the delay period T immediately before the scheduled transmission. d If the channel is not sensed to be idle during any sensing time slot duration, then the channel is deferred for a duration of T d After sensing that the channel is idle during the time slot duration of 1, the UE proceeds to step 1.

[0264] Delay duration T d By duration T f = 16us and m p The duration of each time slot is T sl =9us, and T f Included in T f The idle time slot duration T at the beginning of sl .

[0265] CW min，p ≤CW p ≤CW max，p It is a competition window. CW p Adjustments are described in clause 4.2.2.

[0266] CW min，p and The CW max，p is selected before step 1 of the above procedure.

[0267] m p 、CW min，p and The CW max，p It is based on the channel access priority class p as shown in Table 4.2.1-1 transmitted to the UE.

[0268] 4.2.1.2 Type 2 UL channel access procedure

[0269] This clause describes a channel access procedure to be performed by a UE, where the duration spanned by a sensing slot sensed as idle prior to an UL transmission is deterministic.

[0270] If the UE is instructed by the eNB to perform Type 2 UL channel access procedure, the UE follows the procedure described in clause 4.2.1.2.1.

[0271] 4.2.1.2.1 Type 2A UL Channel Access Procedure

[0272] If the UE is instructed to perform a Type 2A UL channel access procedure, the UE uses the Type 2A UL channel access procedure for UL transmission. The UE may immediately short_ul = Transmit after sensing that the channel is idle within 25us. short_ul By duration T f = 16us and a time slot immediately following it, and T f Included in T f The sensing time slot at the beginning of the short_ul If both sensing time slots of T are sensed as idle, the channel is considered to be in T short_ul Idle.

[0273] 4.2.1.2.2 Type 2B UL Channel Access Procedure

[0274] If the UE is instructed to perform a Type 2B UL channel access procedure, the UE uses the Type 2B UL channel access procedure for UL transmission. f =16us duration after sensing that the channel is idle. f Included in T f If the channel is sensed idle for at least 5 us in total with at least 4 us of sensing occurring in the sensing slot, then the channel is considered idle for duration T f Internal free time.

[0275] 4.2.1.2.3 Type 2C UL Channel Access Procedure

[0276] If the UE is instructed to perform a Type 2C UL channel access procedure for UL transmission, the UE does not sense the channel before transmission. The duration of the corresponding UL transmission is at most 584 μs.

[0277] 4.2.2 Competition Window Adjustment Procedure

[0278] If the UE transmits a transmission associated with channel access priority class p using a Type 1 channel access procedure on a channel, then the UE maintains a contention window value CW as described in this clause p and the CW is adjusted for those transmissions before step 1 of the procedure described in clause 4.2.1.1 p .

[0279] 4.2.2.2 Contention Window Adjustment Procedure for UL Transmissions Scheduled / Configured by gNB

[0280] If the UE transmits a transmission associated with channel access priority class p using a Type 1 channel access procedure on a channel, the UE maintains a contention window value CW p and adjust the CW using the following steps for those transmissions before step 1 of the procedure described in clause 4.2.1.1 p :

[0281] 1) For each priority class p∈{1, 2, 3, 4}, set CW p =CW min，p ;

[0282] 2) If on CW p If HARQ-ACK feedback is available after the last update of , then go to step 3. Otherwise, if the UE transmission after the procedure described in clause 4.2.1.1 does not include retransmissions or p The duration T from the end of the reference duration corresponding to the earliest UL channel occupancy after the last update w If the transmission is in progress, go to step 5; otherwise go to step 4.

[0283] 3) HARQ-ACK Feedback The HARQ-ACK feedback corresponding to the PDSCH in the reference duration of the latest available UL channel occupancy is used as follows:

[0284] a. If at least one HARQ-ACK feedback is 'ACK' for a PUSCH with transport block (TB)-based feedback or at least 10% of the HARQ-ACK feedback is 'ACK' for PUSCH CBGs transmitted at least partially on a channel with code block group (CBG)-based feedback, then go to step 1; otherwise, go to step 4.

[0285] 4) The CW for each priority class p∈{1, 2, 3, 4} p Increase to the next higher allowed value;

[0286] 5) For each priority class p∈{1, 2, 3, 4}, maintain CW p No change; go to step 2.

[0287] HARQ-ACK feedback, reference duration and duration T in the above procedure w Defined as follows:

[0288] - For the purpose of contention window adjustment in this clause, HARQ-ACK feedback for PUSCH transmissions is expected to be provided to the UE either explicitly or implicitly, where the explicit HARQ-ACK is determined based on the valid HARQ-ACK feedback in the corresponding CG-DFI as described in clause 10.5 of [7], and the implicit HARQ-ACK feedback is determined based on the indication of a new transmission or retransmission in the DCI-scheduled PUSCH, as follows:

[0289] - If a new transmission is indicated, 'ACK' is assumed for the transport block or code block group in the corresponding PUSCH for TB-based and CBG-based transmissions, respectively.

[0290] - If retransmission is indicated for a TB-based transmission, 'NACK' is assumed for the transport block in the corresponding PUSCH.

[0291] - If retransmission is indicated for a CBG based transmission, if the bit value in the Code Block Group Transmission Information (CBGTI) field is '0' or '1' as described in clause 5.1.7.2 in [8], then 'ACK' or 'NACK' is assumed for the corresponding CBG in the corresponding PUSCH, respectively.

[0292] - The reference duration corresponding to a channel occupation containing PUSCH transmission initiated by a UE is defined in this clause as the duration starting from the start of the channel occupation until the end of the first time slot in which at least one PUSCH is transmitted on all resources allocated for PUSCH, or until the end of the UE's first transmission burst containing PUSCH transmitted on all resources allocated for PUSCH, whichever occurs first. If the channel occupation contains PUSCH, but it does not contain any PUSCH transmitted on all resources allocated for said PUSCH, then the duration of the UE's first transmission burst within the channel occupation containing PUSCH is the reference duration for CWS adjustment.

[0293] -T w =max(T A , TB +1ms), where T B is the duration of the transmit burst in ms from the start of the reference duration, and if there is no long-term guarantee (eg by regulatory levels) that there are no other technologies sharing the channel, then T A =5ms, otherwise T A =10ms.

[0294] If the UE transmits a transmission on a channel using a Type 1 channel access procedure associated with channel access priority class p and the transmission is not associated with explicit or implicit HARQ-ACK feedback as described above in this clause, then the UE uses the latest CW for any UL transmission on the channel using the Type 1 channel access procedure associated with channel access priority class p p , adjust CW before step 1 in the procedure described in clause 4.2.1.1 p If the corresponding channel access priority class p has not been used for any UL transmission on the channel, then CW p =CW min，p .

[0295] 4.2.2.3 Common procedures for CWS adjustment for UL transmission

[0296] The following applies to the procedures described in clauses 4.2.2.1 and 4.2.2.2:

[0297] -If CW p =CW max，p , then used to adjust CW p The next higher allowed value is CW max，p .

[0298] -If CW p =CW max，p Use K times in succession to generate N init , then only for CW p =CW max，p Use K times in succession to generate N init The priority class p will be CW p Reset to CW min，p K is selected by the UE from the value set {1, 2, ..., 8} for each priority class p∈{1, 2, 3, 4}.

[0299] 4.2.3 Energy Detection Threshold Adaptation Procedure

[0300] A UE accessing a channel performing UL transmission shall set an energy detection threshold (X 阈值 ) is less than or equal to the maximum energy detection threshold X Thresh_max .

[0301] X Thresh_max Determine as follows:

[0302] - If the UE is configured with higher layer parameters maxEnergyDetectionThreshold-r14 or maxEnergyDetectionThreshold-r16, then

[0303] -X Thresh_max Set equal to the value sent via the higher layer parameter;

[0304] -otherwise

[0305] - The UE shall determine X′ according to the procedure described in clause 4.2.3.1 Thresh_max ;

[0306] - If the UE is configured with higher layer parameters energyDetectionThresholdOffset-r14 or energyDetectionThresholdOffset-r16, then

[0307] - By adjusting X′ according to the offset value sent via higher layer parameters Thresh_max To set X Thresh_max ;

[0308] -otherwise

[0309] -UE should set X Thresh_max =X′ Thresh_max .

[0310] If the higher layer parameter absenceOfAnyOtherTechnology-r16 is not configured for the UE and the higher layer parameter ul-toDL-COT-SharingED-Threshold-r16 is configured for the UE, the gNB shall use the gNB's transmit power to determine the resulting energy detection threshold ul-toDL-COT-SharingED-Threshold-r16.

[0311] For the case where the UE performs the channel access procedure for UL transmission as described in clause 4.2.1.1 and CG-UCI is not present in the UL transmission or CG-UCI is present in the UL transmission and indicates COT sharing information other than 'COT sharing not available', X Thresh_max Set equal to the value provided by the higher layer parameter ul-toDL-COT-SharingED-Threshold-r16 (if provided).

[0312] 4.2.3.1 Preset Maximum Energy Detection Threshold Calculation Procedure

[0313] If the higher-layer parameters absenceOfAnyOtherTechnology-r14 or absenceOfAnyOtherTechnology-r16 are provided

[0314] - in

[0315] -X r is the maximum energy detection threshold in dBm defined by regulatory requirements when those requirements are defined, otherwise X r =T max +10dB;

[0316] otherwise

[0317] -

[0318]

[0319] in

[0320] -T A =10dB;

[0321] -P H =23dBm;

[0322] -P TX Set to the value of PCMAX_H,c as defined in [3];

[0323] -T max (dBm)=10·log 10(3.16228·10 -8 (mW / MHz)·BWMHz(MHz));

[0324] - BWMHz is the single channel bandwidth in MHz.

[0325] 4.3 Channel access procedure for semi-static channel occupation

[0326] The channel assessment procedure based on semi-static channel occupancy as described in this clause is intended for environments where the absence of other technologies is guaranteed, for example by regulatory levels, privacy policies, etc. If the gNB provides the UE with the higher layer parameter ChannelAccessMode-r16 = 'semi-static' via SIB1 or dedicated configuration, then the channel assessment procedure based on semi-static channel occupancy may be used within every T x The gNB initiates periodic channel occupation, starting from i·T x The even-indexed radio frame starts at and has a maximum channel occupancy time T y =0.95T x , where T is in msx = period is a higher layer parameter provided in SemiStaticChannelAccessConfig, and

[0327] In the subsequent procedures in this clause, when the gNB or UE performs sensing for assessing channel availability, at least during the sensing slot duration T sl = Sensing is performed during 9us. Corresponding X for sensing performed by gNB or UE 阈值 Adjustments are described in clauses 4.1.5 and 4.2.3 respectively.

[0328] The channel occupancy initiated by the gNB and shared with the UE shall meet the following conditions:

[0329] - The gNB shall sense the time slot for at least the duration T sl = 9us. If the channel is sensed to be busy, the gNB shall not perform any transmissions during the current period.

[0330] If the gap between a DL transmission burst and any previous transmission burst is greater than 16us, the gNB may sense for at least the slot duration T sl =9us immediately after sensing that the channel is idle and transmitting the DL transmission burst within the channel occupation time.

[0331] - If the gap between DL and UL transmit bursts is at most 16 us, the gNB can transmit a DL transmit burst after a UL transmit burst within the channel occupancy time without sensing the channel.

[0332] - After detecting a DL transmission burst within the channel occupancy time, the UE may transmit an UL transmission burst as follows:

[0333] - If the gap between UL and DL transmission bursts is at most 16 us, the UE can transmit an UL transmission burst after a DL transmission burst within the channel occupancy time without sensing the channel.

[0334] If the gap between UL and DL transmission bursts is greater than 16 us, the UE may sense for at least the time slot duration T in the 25 us interval ending immediately before the transmission. sl =9us after sensing that the channel is idle, a UL transmission burst is transmitted after a DL transmission burst within the channel occupation time.

[0335] - The gNB and UE must be at least T before the start of the next cycle z =max(0.05T x, 100us) in a continuous symbol set shall not transmit anything.

[0336] If the UE fails to access the channel before the scheduled UL transmission to the gNB, Layer 1 notifies higher layers of the channel access failure.

[0337] There is research on operation in frequency bands above 52.6 gigahertz (GHz). Some variations and / or modifications are contemplated because there are several characteristics that differ from lower conventional frequency bands (e.g., at least one of a wider available bandwidth, greater noise such as greater phase noise, different (e.g., greater) inter-cell interference (ICI), etc.). Therefore, larger subcarrier spacing (e.g., up to 960 kHz) is contemplated and the bandwidth of the cell may be increased to the GHz level (e.g., 1 or 2 GHz). Alternatively and / or in addition, since unlicensed spectrum may be present in the frequency bands under consideration, whether there are any required changes to the channel access scheme remains to be discussed. For example, there may be some situations in which a device accesses a channel and / or spectrum without LBT (e.g., no LBT). Alternatively and / or in addition, one or more adjustments to LBT may be considered, such as directional LBT and / or receiver-assisted LBT. Information related to frequency bands, LBT, and / or one or more adjustments to LBT is provided in one or more sections of RP-202925 cited below:

[0338] Based on the results of a study project to support NR above 52.6 GHz and to leverage FR2 designs as much as possible, this WI extends NR operation up to 71 GHz, considering both licensed and unlicensed operation, with the following objectives:

[0339] ■ Physical layer aspects including [RAN1]:

[0340] o In addition to the 120 kHz SCS, new SCSs, 480 kHz and 960 kHz are specified and the maximum bandwidth is defined for operation in this frequency range for data and control channels and reference signals, only NCP is supported.

[0341] Note: Except for timing line related aspects, the common design framework should be used for 480kHz to 960kHz

[0342] o Timeline related aspects for 480kHz and 960kHz, such as BWP and beam switching timing, HARQ timing, UE processing, preparation and calculation timelines for PDSCH, PUSCH / SRS and CSI respectively.

[0343] o Support of up to 64 SSB beams for licensed and unlicensed operation in this frequency range.

[0344] o Supports 120kHz SCS for SSB and 120kHz SCS for initial access-related signals / channels in initial BWP.

[0345] ■If necessary, study and specify additional SCS (240kHz, 480kHz, 960kHz) for SSB, and additional SCS (480kHz, 960kHz) for initial access-related signals / channels in the initial BWP.

[0346] ■ If necessary, study and specify additional SCSs (480 kHz, 960 kHz) for SSB for cases other than initial access.

[0347] ■Note: Coverage enhancement for SSB is not implemented.

[0348] o Specify the timing associated with beam-based operations as a new SCS (i.e., 480 kHz and / or 960 kHz), and study and specify potential enhancements for shared spectrum operations if needed

[0349] ■ Study which beam management will be used as the basis: R15 / 16 or R17 in RAN#91-e

[0350] o Supports enhancements for PUCCH formats 0 / 1 / 4 to increase the number of RBs under PSD limitation in shared spectrum operation.

[0351] o Support for enhancements for multiple PDSCH / PUSCH scheduling and HARQ support with a single DCI

[0352] Note: Coverage enhancement for multiple PDSCH / PUSCH scheduling is not implemented

[0353] o Support for enhancements to PDCCH monitoring, including blind detection / CCE budget, and multi-slot span monitoring, potential restrictions on UE PDCCH configuration and capabilities related to PDCCH monitoring.

[0354] o Specify support for PRACH sequence lengths (i.e., L=139, L=571, and L=1151), and if needed, study and specify support for non-contiguous RACH occasion (RO) configuration in the time domain for operation in shared spectrum

[0355] o Evaluate and, if necessary, specify PTRS enhancement for 120 kHz SCS, 480 kHz SCS, and / or 960 kHz SCS, and DMRS enhancement for 480 kHz SCS and / or 960 kHz SCS.

[0356] ■Contains the physical layer procedures of [RAN1]:

[0357] o The channel access mechanism assumes beam-based operation in order to comply with regulatory requirements applicable to the unlicensed spectrum at frequencies between 52.6 GHz and 71 GHz.

[0358] ■Specify LBT and no-LBT related procedures, and do not specify additional sensing mechanisms for the no-LBT case.

[0359] ■ Study and, if necessary, specify omnidirectional LBT, directional LBT, and receiver assistance in channel access

[0360] ■ Study and, if necessary, specify energy detection threshold enhancements

[0361] As discussed above, there may be at least two channel access modes (e.g., listen-before-talk (LBT) and no LBT) for at least some frequency bands (e.g., high frequency bands, such as frequency bands above 52.6 gigahertz (GHz)). Different types of LBT may exist, such as at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, etc. Tradeoffs may exist between different types of LBT and / or channel access modes (e.g., the at least two channel access modes). For example, a no LBT mode may reduce the latency of a transmission to provide a benefit in terms of throughput. For example, reduced latency and / or throughput benefits may be provided when there is no conflict between a transmission and one or more other transmissions (e.g., when there is no conflict between a transmission and one or more other transmissions from a receiver's perspective, such as when a transmission is transmitted to one receiver and does not conflict with one or more other transmissions transmitted to the one receiver). On the other hand, if transmissions (e.g., transmissions to one receiver) have collided with each other, resulting in a decoding failure (e.g., a decoding failure from the perspective of one receiver, such as a situation where the one receiver to which the transmissions were transmitted was unable to successfully decode the transmission due to the collision of the transmissions with each other), then LBT may be a better choice. There may be one or more criteria for the device to correctly determine (e.g., judge) whether to perform LBT and / or how to perform LBT. For example, based on the one or more criteria and / or using one or more of the techniques herein, the device can determine whether to perform an LBT channel access mode or a non-LBT channel access mode for the transmission, and / or the UE can determine (in response to, for example, determining to perform an LBT channel access mode for the transmission) which type of LBT (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, etc.) will be performed for the transmission.

[0362] The concepts of the present disclosure are to determine whether to perform LBT on a transmission and / or how to perform LBT on a transmission based on one or more properties of the transmission. For example, based on the one or more properties, a device may determine whether to perform LBT on a transmission, and / or a UE may determine (in response to, for example, determining to perform LBT on a transmission) which type of LBT to perform for the transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, etc.). The one or more properties may include a priority for the transmission. The one or more properties may include a channel for the transmission. The one or more properties may include a signal for the transmission. The one or more properties may include the content of the transmission. The one or more properties may include information carried by the transmission (e.g., the transmission includes transmitting the information). In one example, the information (e.g., carried by the transmission) may include (e.g., may be) broadcast information (e.g., information transmitted to multiple receiving devices via a broadcast transmission). Alternatively and / or in addition, the information may include (e.g., may be) unicast information (e.g., information transmitted to a single receiving device via a unicast transmission). Alternatively and / or in addition, the information may include (e.g., may be) control information. Alternatively and / or additionally, the information may include (eg, may be) data information.Alternatively and / or additionally, the information may include (eg, may be) LBT related information.

[0363] In some examples, the device determines whether to perform LBT on the transmission based on one or more first properties of the transmission.

[0364] In one example (e.g., an example in which the one or more first properties include a priority of the transmission), the device determines whether to perform LBT on the transmission based on the priority of the transmission. For example, if the transmission has a low priority (e.g., the priority of the transmission is below a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), the device may perform LBT on the transmission. Alternatively and / or additionally, if the transmission has a high priority (e.g., the priority of the transmission is above a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), the device may not perform LBT on the transmission. The threshold (e.g., the threshold priority) may be defined (e.g., predefined), configured (e.g., preconfigured), and / or indicated (e.g., by a base station). For example, the threshold may be configured (e.g., preconfigured) for the device (e.g., the device may be configured with a configuration including the threshold). Alternatively and / or additionally, the device may configure the threshold. Alternatively and / or additionally, the device (e.g., a UE) may receive an indication of the threshold (e.g., from a base station). Alternatively and / or additionally, an apparatus (eg, a base station) may transmit (eg, to a UE) an indication of the threshold.

[0365] In one example (e.g., an example in which the one or more first properties include a channel used for transmission), the device determines whether to perform LBT on the transmission based on the channel used for transmission. For example, if the first channel is used for transmission (and / or when the first channel is used for transmission and / or based on the determination that the first channel is used for transmission), the device may perform LBT on the transmission. Alternatively and / or in addition, if the second channel is used for transmission (and / or when the second channel is used for transmission and / or based on the determination that the second channel is used for transmission), the device may not perform LBT on the transmission.

[0366] The first channel may be a physical uplink shared channel (PUSCH). Alternatively and / or additionally, the first channel may be a physical uplink control channel (PUCCH). Alternatively and / or additionally, the first channel may be a physical random access channel (PRACH). Alternatively and / or additionally, the first channel may be a physical downlink control channel (PDCCH). Alternatively and / or additionally, the first channel may be a physical downlink shared channel (PDSCH). Alternatively and / or additionally, the first channel may be a physical broadcast channel (PBCH). Alternatively and / or additionally, the first channel may be a synchronization signal block (SSB). Herein, "SSB" may refer to a synchronization signal / PBCH block. The second channel may be a PUSCH. Alternatively and / or additionally, the second channel may be a PUCCH. Alternatively and / or additionally, the second channel may be a PRACH. Alternatively and / or additionally, the second channel may be a PDCCH. Alternatively and / or additionally, the second channel may be a PDSCH. Alternatively and / or additionally, the second channel may be a PBCH. Alternatively and / or additionally, the second channel may be an SSB.

[0367] In one example (e.g., an example in which the one or more first properties include a signal for transmission), the device determines whether to perform LBT on the transmission based on the signal for transmission. For example, if the first signal is for transmission (and / or when the first signal is for transmission and / or based on a determination that the first signal is for transmission), the device may perform LBT on the transmission. Alternatively and / or in addition, if the second signal is for transmission (and / or when the second signal is for transmission and / or based on a determination that the second signal is for transmission), the device may not perform LBT on the transmission.

[0368] The first signal may be a sounding reference signal (SRS). Alternatively and / or additionally, the first signal may be a primary synchronization signal (PSS). Alternatively and / or additionally, the first signal may be a secondary synchronization signal (SSS). Alternatively and / or additionally, the first signal may be an SSB. Alternatively and / or additionally, the first signal may be a preamble. Alternatively and / or additionally, the preamble is carried on a PRACH. The second signal may be an SRS. Alternatively and / or additionally, the second signal may be a PSS. Alternatively and / or additionally, the second signal may be an SSS. Alternatively and / or additionally, the second signal may be an SSB. Alternatively and / or additionally, the second signal may be a preamble.

[0369] In one example (e.g., an example in which the one or more first properties include information carried by a transmission), the device determines whether to perform LBT on the transmission based on the information carried by the transmission (e.g., information transmitted via the transmission). For example, if the transmission carries first information (and / or when the transmission carries the first information and / or based on a determination that the transmission carries the first information), then the device may perform LBT on the transmission. Alternatively and / or in addition, if the transmission carries second information (and / or when the transmission carries the second information and / or based on a determination that the transmission carries the second information), then the device may not perform LBT on the transmission.

[0370] The first information may include (e.g., may be) broadcast information (e.g., broadcast information). Alternatively and / or in addition, the first information may include (e.g., may be) unicast information. Alternatively and / or in addition, the first information may include (e.g., may be) control information. Alternatively and / or in addition, the first information may include (e.g., may be) data information. Alternatively and / or in addition, the first information may include (e.g., may be) LBT-related information. Alternatively and / or in addition, the first information may include (e.g., may be) information not related to LBT. The second information may include (e.g., may be) broadcast information (e.g., broadcast information). Alternatively and / or in addition, the second information may include (e.g., may be) unicast information. Alternatively and / or in addition, the second information may include (e.g., may be) control information. Alternatively and / or in addition, the second information may include (e.g., may be) data information. Alternatively and / or in addition, the second information may include (e.g., may be) LBT-related information. Alternatively and / or in addition, the second information may include (e.g., may be) information not related to LBT.

[0371] In one example, if broadcast information is carried by a transmission (and / or when broadcast information is carried by a transmission and / or based on a determination that broadcast information is carried by a transmission), the apparatus may perform LBT on the transmission. Alternatively and / or additionally, if unicast information is carried by a transmission (and / or when unicast information is carried by a transmission and / or based on a determination that unicast information is carried by a transmission), the apparatus may not perform LBT on the transmission. Alternatively and / or additionally, if data is carried by a transmission (and / or when data is carried by a transmission and / or based on a determination that data is carried by a transmission), the apparatus may perform LBT on the transmission. An example of data is user plane data. Another example of data is unicast data. Yet another example of data is data on a data channel scheduled by a control channel. Alternatively and / or additionally, if control information is carried by a transmission (and / or when control information is carried by a transmission and / or based on a determination that control information is carried by a transmission), the apparatus may not perform LBT on the transmission. The control information may include (for example, may be) channel state information (CSI). Alternatively and / or in addition, the control information may include (e.g., may be) acknowledgement (ACK) / negative acknowledgement (NACK) information (e.g., the ACK / NACK information may include an ACK indication and / or NACK information and / or may correspond to feedback indicating whether the transmission was successfully received). Alternatively and / or in addition, the control information may include (e.g., may be) time slot formation information. Alternatively and / or in addition, the control information may include (e.g., may be) delayed feedback information (DFI). Alternatively and / or in addition, if the information carried by the transmission is not related to LBT (and / or when the information carried by the transmission is not related to LBT and / or based on a determination that the information carried by the transmission is not related to LBT), then the device may perform LBT on the transmission. Alternatively and / or in addition, if LBT-related information is carried by the transmission (and / or when LBT-related information is carried by the transmission and / or based on a determination that LBT-related information is carried by the transmission), then the device may not perform LBT on the transmission.

[0372] In some instances, the device determines how to perform LBT on the transmission based on one or more second properties of the transmission. For example, the determination of how to perform LBT on the transmission can correspond to the determination of the type of LBT to be performed on the transmission and / or the determination of the values ​​of LBT parameters to be used to perform LBT on the transmission. In some instances, the determination of how to perform LBT on the transmission can be performed in response to (and / or after) the determination to perform LBT on the transmission. Alternatively and / or in addition, the determination of how to perform LBT on the transmission can be performed simultaneously with (or before) the determination to perform LBT on the transmission. In an instance, the device determines whether to perform the first type of LBT or the second type of LBT on the transmission based on the one or more second properties of the transmission.

[0373] In one instance (e.g., an instance in which the one or more second properties include a priority of the transmission), the device determines how to perform LBT on the transmission based on the priority of the transmission. For example, the device may determine whether to perform a first type of LBT or a second type of LBT on the transmission based on the priority of the transmission. In one instance, if the transmission has a low priority (e.g., the priority of the transmission is below a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), then the device may perform a first type of LBT on the transmission. Alternatively and / or in addition, if the transmission has a high priority (e.g., the priority of the transmission is above a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), then the device may perform a second type of LBT on the transmission.

[0374] In one example (e.g., an example in which the one or more second properties include a channel / signal used for transmission), the device determines how to perform LBT on the transmission based on the channel / signal used for transmission. For example, the device may determine whether to perform a first type of LBT or a second type of LBT on the transmission based on the channel / signal used for transmission. In one example, if a first channel / signal is used for transmission (and / or when the first channel / signal is used for transmission and / or based on a determination that the first channel / signal is used for transmission), the device may perform the first type of LBT on the transmission. Alternatively and / or in addition, if a second channel / signal is used for transmission (and / or when the second channel / signal is used for transmission and / or based on a determination that the second channel / signal is used for transmission), the device may perform the second type of LBT on the transmission. Herein, the term "channel / signal" may refer to a channel and / or a signal. For example, a first channel / signal may correspond to a first channel and / or a first signal. A second channel / signal may correspond to a second channel and / or a second signal.

[0375] In one example (e.g., an example in which the one or more second properties include information carried by a transmission), the device determines how to perform LBT on the transmission based on the information carried by the transmission. For example, the device can determine whether to perform a first type of LBT or a second type of LBT on the transmission based on the information carried by the transmission. In one example, if the transmission carries first information (and / or when the transmission carries the first information and / or based on a determination that the transmission carries the first information), then the device can perform the first type of LBT on the transmission. Alternatively and / or in addition, if the transmission carries second information (and / or when the transmission carries the second information and / or based on a determination that the transmission carries the second information), then the device can perform the second type of LBT on the transmission.

[0376] In one example, if data is carried by a transmission (and / or when data is carried by a transmission and / or based on a determination that data is carried by a transmission), then the device may perform a first type of LBT on the transmission. Alternatively and / or additionally, if control information is carried by a transmission (and / or when control information is carried by a transmission and / or based on a determination that control information is carried by a transmission), then the device may perform a second type of LBT on the transmission. Alternatively and / or additionally, if broadcast information is carried by a transmission (and / or when broadcast information is carried by a transmission and / or based on a determination that broadcast information is carried by a transmission), then the device may perform a first type of LBT on the transmission. Alternatively and / or additionally, if unicast information is carried by a transmission (and / or when unicast information is carried by a transmission and / or based on a determination that unicast information is carried by a transmission), then the device may perform a second type of LBT on the transmission. Alternatively and / or additionally, if LBT-related information is carried by the transmission (and / or when LBT-related information is carried by the transmission and / or based on a determination that LBT-related information is carried by the transmission), then the device may perform a first type of LBT on the transmission. Alternatively and / or additionally, if the information carried by the transmission does not include LBT-related information (and / or when the information carried by the transmission does not include LBT-related information and / or based on a determination that the information carried by the transmission does not include LBT-related information), then the device may perform a second type of LBT on the transmission.

[0377] The first type of LBT may be an omnidirectional LBT. Alternatively and / or additionally, the first type of LBT may be a directional LBT. Alternatively and / or additionally, the first type of LBT may be a receiver-assisted LBT. The second type of LBT may be an omnidirectional LBT. Alternatively and / or additionally, the second type of LBT may be a directional LBT. Alternatively and / or additionally, the second type of LBT may be a receiver-assisted LBT.

[0378] In some examples, different types of LBT can be associated with different values ​​of one or more LBT parameters. In one example, a first type of LBT can be associated with a first value of an LBT parameter. A second type of LBT can be associated with a second value of an LBT parameter. The LBT parameter can be a threshold for LBT (e.g., an energy detection threshold). Alternatively and / or in addition, the LBT parameter can be a window size for LBT (e.g., a contention window size).

[0379] In some examples, the first type of LBT is different from the second type of LBT. In one example, the first type of LBT may be an omnidirectional LBT and the second type of LBT may be a directional LBT or a receiver-assisted LBT. In one example, the first type of LBT may be a directional LBT and the second type of LBT may be an omnidirectional LBT or a receiver-assisted LBT. In one example, the first type of LBT may be a receiver-assisted LBT and the second type of LBT may be an omnidirectional LBT or a directional LBT. In one example, the first type of LBT and the second type of LBT may be omnidirectional LBTs, wherein a first value of an LBT parameter of the first type of LBT is different from a second value of an LBT parameter of the second type of LBT. In one example, the first type of LBT and the second type of LBT may be directional LBTs, wherein a first value of an LBT parameter of the first type of LBT is different from a second value of an LBT parameter of the second type of LBT. In one example, the first type of LBT and the second type of LBT may be receiver-assisted LBTs, wherein a first value of an LBT parameter of the first type of LBT is different from a second value of an LBT parameter of the second type of LBT.

[0380] With respect to one or more embodiments provided herein, such as the examples provided above, the apparatus may be a base station. Alternatively and / or additionally, the apparatus may be a UE.

[0381] With respect to one or more embodiments provided herein, such as the examples provided above, the transmission may be a PUSCH transmission. Alternatively and / or additionally, the transmission may be a PUCCH transmission. Alternatively and / or additionally, the transmission may be a PRACH transmission. Alternatively and / or additionally, the transmission may be an SRS transmission. Alternatively and / or additionally, the transmission may be a preamble transmission. Alternatively and / or additionally, the transmission may be a PDCCH transmission. Alternatively and / or additionally, the transmission may be a PDSCH transmission. Alternatively and / or additionally, the transmission may be a PBCH transmission. Alternatively and / or additionally, the transmission may be an SSB transmission.

[0382] In one example, the first type of LBT may be a downlink (DL) channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 1 DL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2 DL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2A DL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2B DL ​​channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2C DL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type A multi-channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type A1 multi-channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type A2 multi-channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type B multi-channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type B1 multi-channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type B2 multi-channel access procedure. Alternatively and / or additionally, the first type of LBT may be an uplink (UL) channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 1 UL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2 UL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2A UL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2B UL channel access procedure. Alternatively and / or additionally, the first type of LBT may be a type 2C UL channel access procedure.

[0383] In one example, the second type of LBT may be a DL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 1 DL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2 DL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2A DL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2B DL ​​channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2C DL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type A multi-channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type A1 multi-channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type A2 multi-channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type B multi-channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type B1 multi-channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type B2 multi-channel access procedure. Alternatively and / or additionally, the second type of LBT may be a UL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 1 UL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2 UL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2A UL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2B UL channel access procedure. Alternatively and / or additionally, the second type of LBT may be a Type 2C UL channel access procedure.

[0384] In a first embodiment, the UE determines whether to perform LBT on a transmission and / or how to perform LBT on the transmission based on one or more properties of the transmission, wherein the one or more properties include a priority of the transmission. For example, based on the priority of the transmission, the UE may determine whether to perform LBT on the transmission, and / or the UE may determine (in response to, for example, determining to perform LBT on the transmission) which type of LBT to perform on the transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0385] In one example, if the transmission has a low priority (e.g., the priority of the transmission is lower than a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), the UE may perform LBT on the transmission. If the transmission has a high priority (e.g., the priority of the transmission is higher than a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), the UE may not perform LBT on the transmission (e.g., the UE may directly perform the transmission without LBT).

[0386] In one example, if the transmission has a low priority (e.g., the priority of the transmission is lower than a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), the UE may perform a first type of LBT on the transmission. If the transmission has a high priority (e.g., the priority of the transmission is higher than a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), the UE may perform a second type of LBT on the transmission.

[0387] In one example, if the transmission has a low priority (e.g., the priority of the transmission is lower than a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), the UE may perform LBT for a first value of the LBT parameter transmitted for LBT. If the transmission has a high priority (e.g., the priority of the transmission is higher than a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), the UE may perform LBT for a second value of the LBT parameter transmitted for LBT.

[0388] In some examples, a threshold value (e.g., a threshold priority) can be defined (e.g., predefined), configured (e.g., preconfigured), and / or indicated (e.g., indicated by a base station). For example, a threshold value can be configured (e.g., preconfigured) for a UE (e.g., a configuration including the threshold value can be configured for the UE). Alternatively and / or in addition, the UE can configure the threshold value. Alternatively and / or in addition, the UE can receive an indication of the threshold value (e.g., from a base station).

[0389] In a second embodiment, a base station determines whether to perform LBT on a transmission and / or how to perform LBT on a transmission based on one or more properties of the transmission, wherein the one or more properties include a priority of the transmission. For example, based on the priority of the transmission, the base station may determine whether to perform LBT on the transmission, and / or the base station may determine (in response to, for example, determining to perform LBT on the transmission) which type of LBT to perform on the transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0390] In one example, if the transmission has a low priority (e.g., the priority of the transmission is below a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), then the base station may perform LBT on the transmission. If the transmission has a high priority (e.g., the priority of the transmission is above a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), then the base station may not perform LBT on the transmission (e.g., the base station may directly perform the transmission without LBT).

[0391] In one example, if the transmission has a low priority (e.g., the priority of the transmission is below a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), the base station can perform a first type of LBT on the transmission. If the transmission has a high priority (e.g., the priority of the transmission is above a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), the base station can perform a second type of LBT on the transmission.

[0392] In one example, if the transmission has a low priority (e.g., the priority of the transmission is lower than a threshold, such as a threshold priority) (and / or when the transmission has a low priority and / or based on a determination that the transmission has a low priority), the base station may perform LBT for a first value of the LBT parameter transmitted for LBT. If the transmission has a high priority (e.g., the priority of the transmission is higher than a threshold, such as a threshold priority) (and / or when the transmission has a high priority and / or based on a determination that the transmission has a high priority), the base station may perform LBT for a second value of the LBT parameter transmitted for LBT.

[0393] In some examples, a threshold value (e.g., a threshold priority) can be defined (e.g., predefined), configured (e.g., preconfigured), and / or indicated. For example, a threshold value can be configured (e.g., preconfigured) for a base station (e.g., a configuration including the threshold value can be configured for the base station). Alternatively and / or in addition, the base station can configure the threshold value. Alternatively and / or in addition, the base station can transmit an indication of the threshold value (e.g., to a UE).

[0394] In a third embodiment, the UE determines whether to perform LBT on a transmission and / or how to perform LBT on the transmission based on one or more properties of the transmission, wherein the one or more properties include a channel / signal used for the transmission. For example, based on the channel / signal used for the transmission, the UE may determine whether to perform LBT on the transmission, and / or the UE may determine (in response to, for example, determining to perform LBT on the transmission) which type of LBT to perform on the transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0395] In one example, if a first channel / signal is used for transmission (e.g., the transmission is performed via the first channel and / or the first signal) (and / or when the first channel / signal is used for transmission and / or based on a determination that the first channel / signal is used for transmission), then the UE may perform LBT on the transmission. If a second channel / signal is used for transmission (e.g., the transmission is performed via a second channel and / or a second signal, wherein the second channel is different from the first channel and / or the second signal is different from the first signal) (and / or when the second channel / signal is used for transmission and / or based on a determination that the second channel / signal is used for transmission), then the UE may not perform LBT on the transmission (e.g., the UE may directly perform the transmission without LBT).

[0396] In one example, if PUSCH is used for transmission (e.g., transmission is performed via PUSCH) (and / or when PUSCH is used for transmission and / or based on a determination that PUSCH is used for transmission), then the UE may perform LBT for the transmission. If PUCCH is used for transmission (e.g., transmission is performed via PUCCH) (and / or when PUCCH is used for transmission and / or based on a determination that PUCCH is used for transmission), then the UE may not perform LBT for the transmission (e.g., the UE may directly perform the transmission without LBT).

[0397] In one example, if a first channel / signal is used for transmission (e.g., the transmission is performed via the first channel and / or the first signal) (and / or when the first channel / signal is used for transmission and / or based on a determination that the first channel / signal is used for transmission), the UE may perform a first type of LBT for the transmission. If a second channel / signal is used for transmission (e.g., the transmission is performed via a second channel and / or a second signal, wherein the second channel is different from the first channel and / or the second signal is different from the first signal) (and / or when the second channel / signal is used for transmission and / or based on a determination that the second channel / signal is used for transmission), the UE may perform a second type of LBT for the transmission.

[0398] In one example, if PUSCH is used for transmission (e.g., transmission is performed via PUSCH) (and / or when PUSCH is used for transmission and / or based on a determination that PUSCH is used for transmission), then the UE may perform a first type of LBT for the transmission. If PUCCH is used for transmission (e.g., transmission is performed via PUCCH) (and / or when PUCCH is used for transmission and / or based on a determination that PUCCH is used for transmission), then the UE may perform a second type of LBT for the transmission.

[0399] In one example, if a first channel / signal is used for transmission (e.g., transmission is performed via the first channel and / or the first signal) (and / or when the first channel / signal is used for transmission and / or based on a determination that the first channel / signal is used for transmission), the UE may perform LBT for a first value of the LBT parameter transmitted for LBT. If a second channel / signal is used for transmission (e.g., transmission is performed via a second channel and / or a second signal, wherein the second channel is different from the first channel and / or the second signal is different from the first signal) (and / or when the second channel / signal is used for transmission and / or based on a determination that the second channel / signal is used for transmission), the UE may perform LBT for a second value of the LBT parameter transmitted for LBT.

[0400] In one example, if PUSCH is used for transmission (e.g., transmission is performed via PUSCH) (and / or when PUSCH is used for transmission and / or based on a determination that PUSCH is used for transmission), the UE may perform LBT for a first value of the LBT parameter transmitted for LBT. If PUCCH is used for transmission (e.g., transmission is performed via PUCCH) (and / or when PUCCH is used for transmission and / or based on a determination that PUCCH is used for transmission), the UE may perform LBT for a second value of the LBT parameter transmitted for LBT.

[0401] In a fourth embodiment, a base station determines whether to perform LBT on a transmission and / or how to perform LBT on a transmission based on one or more properties of the transmission, wherein the one or more properties include a channel / signal used for the transmission. For example, based on the channel / signal used for the transmission, the base station may determine whether to perform LBT on the transmission and / or the base station may determine (in response to, for example, determining to perform LBT on the transmission) which type of LBT to perform on the transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0402] In one example, if a first channel / signal is used for transmission (e.g., transmission is performed via the first channel and / or the first signal) (and / or when the first channel / signal is used for transmission and / or based on a determination that the first channel / signal is used for transmission), then the base station may perform LBT on the transmission. If a second channel / signal is used for transmission (e.g., transmission is performed via a second channel and / or a second signal, wherein the second channel is different from the first channel and / or the second signal is different from the first signal) (and / or when the second channel / signal is used for transmission and / or based on a determination that the second channel / signal is used for transmission), then the base station may not perform LBT on the transmission (e.g., the base station may directly perform the transmission without LBT).

[0403] In one example, if the PDSCH is used for transmission (e.g., the transmission is performed via the PDSCH) (and / or when the PDSCH is used for transmission and / or based on the determination that the PDSCH is used for transmission), then the base station may perform LBT for the transmission. If the PDCCH is used for transmission (e.g., the transmission is performed via the PDCCH) (and / or when the PDCCH is used for transmission and / or based on the determination that the PDCCH is used for transmission), then the base station may not perform LBT for the transmission (e.g., the base station may directly perform the transmission without LBT).

[0404] In one example, if a first channel / signal is used for transmission (e.g., the transmission is performed via the first channel and / or the first signal) (and / or when the first channel / signal is used for transmission and / or based on a determination that the first channel / signal is used for transmission), then the base station may perform a first type of LBT for the transmission. If a second channel / signal is used for transmission (e.g., the transmission is performed via a second channel and / or a second signal, where the second channel is different from the first channel and / or the second signal is different from the first signal) (and / or when the second channel / signal is used for transmission and / or based on a determination that the second channel / signal is used for transmission), then the base station may perform a second type of LBT for the transmission.

[0405] In one example, if the PDSCH is used for transmission (e.g., the transmission is performed via the PDSCH) (and / or when the PDSCH is used for transmission and / or based on the determination that the PDSCH is used for transmission), the base station can perform a first type of LBT for the transmission. If the PDCCH is used for transmission (e.g., the transmission is performed via the PDCCH) (and / or when the PDCCH is used for transmission and / or based on the determination that the PDCCH is used for transmission), the base station can perform a second type of LBT for the transmission.

[0406] In one example, if a first channel / signal is used for transmission (e.g., transmission is performed via the first channel and / or the first signal) (and / or when the first channel / signal is used for transmission and / or based on a determination that the first channel / signal is used for transmission), the base station may perform LBT for a first value of the LBT parameter transmitted for LBT. If a second channel / signal is used for transmission (e.g., transmission is performed via a second channel and / or a second signal, wherein the second channel is different from the first channel and / or the second signal is different from the first signal) (and / or when the second channel / signal is used for transmission and / or based on a determination that the second channel / signal is used for transmission), the base station may perform LBT for a second value of the LBT parameter transmitted for LBT.

[0407] In one example, if the PDSCH is used for transmission (e.g., transmission is performed via the PDSCH) (and / or when the PDSCH is used for transmission and / or based on a determination that the PDSCH is used for transmission), the base station may perform LBT for a first value of the LBT parameter transmitted for LBT. If the PDCCH is used for transmission (e.g., transmission is performed via the PDCCH) (and / or when the PDCCH is used for transmission and / or based on a determination that the PDCCH is used for transmission), the base station may perform LBT for a second value of the LBT parameter transmitted for LBT.

[0408] In a fifth embodiment, the UE determines whether to perform LBT on a transmission and / or how to perform LBT on the transmission based on information carried by the transmission (e.g., information transmitted via the transmission). For example, based on the information carried by the transmission, the UE may determine whether to perform LBT on the transmission, and / or the UE may determine (in response to, for example, determining to perform LBT on the transmission) which type of LBT to perform on the transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0409] In one example, if the first information is carried by the transmission (e.g., the transmission includes a transmission of the first information) (and / or when the first information is carried by the transmission and / or based on a determination that the first information is carried by the transmission), then the UE may perform LBT on the transmission. If the second information is carried by the transmission (e.g., the transmission includes a transmission of second information, where the second information is different from the first information) (and / or when the second information is carried by the transmission and / or based on a determination that the second information is carried by the transmission), then the UE may not perform LBT on the transmission (e.g., the UE may directly perform LBT on the transmission without LBT).

[0410] In one example, if broadcast information is carried by a transmission (e.g., the transmission includes a transmission of broadcast information) (and / or when broadcast information is carried by the transmission and / or based on a determination that broadcast information is carried by the transmission), then the UE may perform LBT on the transmission. If unicast information is carried by the transmission (e.g., the transmission includes a transmission of unicast information) (and / or when unicast information is carried by the transmission and / or based on a determination that unicast information is carried by the transmission), then the UE may not perform LBT on the transmission (e.g., the UE may directly perform LBT on the transmission without LBT).

[0411] In one example, if data is carried by a transmission (e.g., the transmission includes a transmission of data) (and / or when data is carried by the transmission and / or based on a determination that data is carried by the transmission), then the UE may perform LBT on the transmission. If control information is carried by the transmission (e.g., the transmission includes a transmission of control information) (and / or when control information is carried by the transmission and / or based on a determination that control information is carried by the transmission), then the UE may not perform LBT on the transmission (e.g., the UE may directly perform LBT on the transmission without LBT).

[0412] In one example, if the LBT-related information is not carried by the transmission (e.g., the transmission does not include the LBT-related information) (and / or when the LBT-related information is not carried by the transmission and / or based on a determination that the LBT-related information is not carried by the transmission), then the UE may perform LBT on the transmission. If the LBT-related information is carried by the transmission (e.g., the transmission includes the LBT-related information) (and / or when the LBT-related information is carried by the transmission and / or based on a determination that the LBT-related information is carried by the transmission), then the UE may not perform LBT on the transmission (e.g., the UE may directly perform the transmission without LBT).

[0413] In one example, if the first information is carried by the transmission (e.g., the transmission includes the transmission of the first information) (and / or when the first information is carried by the transmission and / or based on a determination that the first information is carried by the transmission), then the UE may perform a first type of LBT on the transmission. If the second information is carried by the transmission (e.g., the transmission includes the transmission of second information, where the second information is different from the first information) (and / or when the second information is carried by the transmission and / or based on a determination that the second information is carried by the transmission), then the UE may perform a second type of LBT on the transmission.

[0414] In one example, if broadcast information is carried by a transmission (e.g., the transmission includes a transmission of broadcast information) (and / or when broadcast information is carried by the transmission and / or based on a determination that broadcast information is carried by the transmission), the UE may perform a first type of LBT on the transmission. If unicast information is carried by the transmission (e.g., the transmission includes a transmission of unicast information) (and / or when unicast information is carried by the transmission and / or based on a determination that unicast information is carried by the transmission), the UE may perform a second type of LBT on the transmission.

[0415] In one example, if data is carried by a transmission (e.g., the transmission includes a transmission of data) (and / or when data is carried by the transmission and / or based on a determination that data is carried by the transmission), then the UE may perform a first type of LBT on the transmission. If control information is carried by the transmission (e.g., the transmission includes a transmission of control information) (and / or when control information is carried by the transmission and / or based on a determination that control information is carried by the transmission), then the UE may perform a second type of LBT on the transmission.

[0416] In one example, if the LBT-related information is not carried by the transmission (e.g., the transmission does not include the LBT-related information) (and / or when the LBT-related information is not carried by the transmission and / or based on a determination that the LBT-related information is not carried by the transmission), then the UE may perform a first type of LBT on the transmission. If the LBT-related information is carried by the transmission (e.g., the transmission includes the LBT-related information) (and / or when the LBT-related information is carried by the transmission and / or based on a determination that the LBT-related information is carried by the transmission), then the UE may perform a second type of LBT on the transmission.

[0417] In one example, if the first information is carried by the transmission (e.g., the transmission includes the first information) (and / or when the first information is carried by the transmission and / or based on a determination that the first information is carried by the transmission), the UE may perform LBT on a first value of the LBT parameter transmitted for LBT. If the second information is carried by the transmission (e.g., the transmission includes the second information, where the second information is different from the first information) (and / or when the second information is carried by the transmission and / or based on a determination that the second information is carried by the transmission), the UE may perform LBT on a second value of the LBT parameter transmitted for LBT.

[0418] In one example, if the broadcast information is carried by the transmission (e.g., the transmission includes the transmission of the broadcast information) (and / or when the broadcast information is carried by the transmission and / or based on a determination that the broadcast information is carried by the transmission), the UE may perform LBT on a first value of the LBT parameter transmitted for LBT. If the unicast information is carried by the transmission (e.g., the transmission includes the transmission of unicast information) (and / or when the unicast information is carried by the transmission and / or based on a determination that the unicast information is carried by the transmission), the UE may perform LBT on a second value of the LBT parameter transmitted for LBT.

[0419] In one example, if data is carried by the transmission (e.g., the transmission includes the transmission of data) (and / or when the data is carried by the transmission and / or based on a determination that the data is carried by the transmission), the UE may perform LBT on a first value of the LBT parameter transmitted for LBT. If control information is carried by the transmission (e.g., the transmission includes the transmission of control information) (and / or when the control information is carried by the transmission and / or based on a determination that the control information is carried by the transmission), the UE may perform LBT on a second value of the LBT parameter transmitted for LBT.

[0420] In one example, if the LBT-related information is not carried by the transmission (e.g., the transmission does not include the LBT-related information) (and / or when the LBT-related information is not carried by the transmission and / or based on a determination that the LBT-related information is not carried by the transmission), the UE may perform LBT on a first value of the LBT parameter transmitted for LBT. If the LBT-related information is carried by the transmission (e.g., the transmission includes the LBT-related information) (and / or when the LBT-related information is carried by the transmission and / or based on a determination that the LBT-related information is carried by the transmission), the UE may perform LBT on a second value of the LBT parameter transmitted for LBT.

[0421] In a sixth embodiment, a base station determines whether to perform LBT on a transmission and / or how to perform LBT on the transmission based on information carried by the transmission (e.g., information transmitted via the transmission). For example, based on the information carried by the transmission, the base station may determine whether to perform LBT on the transmission, and / or the base station may determine (in response to, for example, determining to perform LBT on the transmission) which type of LBT to perform on the transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0422] In one example, if the first information is carried by the transmission (e.g., the transmission includes the transmission of the first information) (and / or when the first information is carried by the transmission and / or based on a determination that the first information is carried by the transmission), then the base station may perform LBT on the transmission. If the second information is carried by the transmission (e.g., the transmission includes the transmission of second information, where the second information is different from the first information) (and / or when the second information is carried by the transmission and / or based on a determination that the second information is carried by the transmission), then the base station may not perform LBT on the transmission (e.g., the base station may directly perform LBT on the transmission without LBT).

[0423] In one example, if broadcast information is carried by a transmission (e.g., the transmission includes a transmission of broadcast information) (and / or when broadcast information is carried by the transmission and / or based on a determination that broadcast information is carried by the transmission), then the base station may perform LBT on the transmission. If unicast information is carried by the transmission (e.g., the transmission includes a transmission of unicast information) (and / or when unicast information is carried by the transmission and / or based on a determination that unicast information is carried by the transmission), then the base station may not perform LBT on the transmission (e.g., the base station may directly perform LBT on the transmission without LBT).

[0424] In one example, if data is carried by a transmission (e.g., the transmission includes the transmission of data) (and / or when data is carried by the transmission and / or based on a determination that data is carried by the transmission), then the base station may perform LBT on the transmission. If control information is carried by the transmission (e.g., the transmission includes the transmission of control information) (and / or when control information is carried by the transmission and / or based on a determination that control information is carried by the transmission), then the base station may not perform LBT on the transmission (e.g., the base station may directly perform LBT on the transmission without LBT).

[0425] In one example, if the LBT-related information is not carried by the transmission (e.g., the transmission does not include the LBT-related information) (and / or when the LBT-related information is not carried by the transmission and / or based on a determination that the LBT-related information is not carried by the transmission), then the base station may perform LBT on the transmission. If the LBT-related information is carried by the transmission (e.g., the transmission includes the LBT-related information) (and / or when the LBT-related information is carried by the transmission and / or based on a determination that the LBT-related information is carried by the transmission), then the base station may not perform LBT on the transmission (e.g., the base station may directly perform the transmission without LBT).

[0426] In one example, if the transmission carries first information (e.g., the transmission includes the transmission of the first information) (and / or when the transmission carries the first information and / or based on a determination that the transmission carries the first information), then the base station may perform a first type of LBT on the transmission. If the transmission carries second information (e.g., the transmission includes the transmission of second information, where the second information is different from the first information) (and / or when the transmission carries the second information and / or based on a determination that the transmission carries the second information), then the base station may perform a second type of LBT on the transmission.

[0427] In one example, if broadcast information is carried by a transmission (e.g., the transmission includes a transmission of broadcast information) (and / or when broadcast information is carried by the transmission and / or based on a determination that broadcast information is carried by the transmission), then the base station can perform a first type of LBT on the transmission. If unicast information is carried by the transmission (e.g., the transmission includes a transmission of unicast information) (and / or when unicast information is carried by the transmission and / or based on a determination that unicast information is carried by the transmission), then the base station can perform a second type of LBT on the transmission.

[0428] In one example, if data is carried by a transmission (e.g., the transmission includes a transmission of data) (and / or when data is carried by the transmission and / or based on a determination that data is carried by the transmission), then the base station can perform a first type of LBT on the transmission. If control information is carried by the transmission (e.g., the transmission includes a transmission of control information) (and / or when control information is carried by the transmission and / or based on a determination that control information is carried by the transmission), then the base station can perform a second type of LBT on the transmission.

[0429] In one example, if the LBT-related information is not carried by the transmission (e.g., the transmission does not include the LBT-related information) (and / or when the LBT-related information is not carried by the transmission and / or based on a determination that the LBT-related information is not carried by the transmission), then the base station may perform a first type of LBT on the transmission. If the LBT-related information is carried by the transmission (e.g., the transmission includes the LBT-related information) (and / or when the LBT-related information is carried by the transmission and / or based on a determination that the LBT-related information is carried by the transmission), then the base station may perform a second type of LBT on the transmission.

[0430] In one example, if the first information is carried by the transmission (e.g., the transmission includes the first information) (and / or when the first information is carried by the transmission and / or based on a determination that the first information is carried by the transmission), the base station may perform LBT on a first value of the LBT parameter transmitted for LBT. If the second information is carried by the transmission (e.g., the transmission includes the second information, where the second information is different from the first information) (and / or when the second information is carried by the transmission and / or based on a determination that the second information is carried by the transmission), the base station may perform LBT on a second value of the LBT parameter transmitted for LBT.

[0431] In one example, if broadcast information is carried by the transmission (e.g., the transmission includes a transmission of broadcast information) (and / or when broadcast information is carried by the transmission and / or based on a determination that broadcast information is carried by the transmission), the base station may perform LBT on a first value of the LBT parameter transmitted for LBT. If unicast information is carried by the transmission (e.g., the transmission includes a transmission of unicast information) (and / or when unicast information is carried by the transmission and / or based on a determination that unicast information is carried by the transmission), the base station may perform LBT on a second value of the LBT parameter transmitted for LBT.

[0432] In one example, if data is carried by the transmission (e.g., the transmission includes the transmission of data) (and / or when the data is carried by the transmission and / or based on a determination that the data is carried by the transmission), the base station can perform LBT on a first value of the LBT parameter transmitted for LBT. If control information is carried by the transmission (e.g., the transmission includes the transmission of control information) (and / or when the control information is carried by the transmission and / or based on a determination that the control information is carried by the transmission), the base station can perform LBT on a second value of the LBT parameter transmitted for LBT.

[0433] In one example, if the LBT-related information is not carried by the transmission (e.g., the transmission does not include the LBT-related information) (and / or when the LBT-related information is not carried by the transmission and / or based on a determination that the LBT-related information is not carried by the transmission), then the base station may perform LBT on the first value of the LBT parameter transmitted for LBT. If the LBT-related information is carried by the transmission (e.g., the transmission includes the LBT-related information) (and / or when the LBT-related information is carried by the transmission and / or based on a determination that the LBT-related information is carried by the transmission), then the base station may perform LBT on the second value of the LBT parameter transmitted for LBT.

[0434] One, some and / or all of the above techniques and / or embodiments may be formed into new embodiments.

[0435] In some instances, embodiments disclosed herein, such as those described with respect to the first, second, third, fourth, fifth, and sixth embodiments, may be implemented independently and / or separately. Alternatively and / or additionally, combinations of embodiments described herein, such as those described with respect to the first, second, third, fourth, fifth, and / or sixth embodiments, may be implemented. Alternatively and / or additionally, combinations of embodiments described herein, such as those described with respect to the first, second, third, fourth, fifth, and / or sixth embodiments, may be implemented concurrently and / or simultaneously.

[0436] The various techniques, embodiments, methods and / or alternatives of the present disclosure can be performed independently and / or separately from each other. Alternatively and / or in addition, the various techniques, embodiments, methods and / or alternatives of the present disclosure can be combined and / or implemented using a single system. Alternatively and / or in addition, the various techniques, embodiments, methods and / or alternatives of the present disclosure can be implemented in parallel and / or simultaneously.

[0437] With respect to one or more embodiments of the present invention, for example, with respect to one or more embodiments provided with respect to the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment and / or other embodiments of the present disclosure, in an instance in which a device (e.g., a UE and / or a base station) performs a type of LBT (e.g., a first type of LBT and / or a second type of LBT), the device may perform LBT according to the type of LBT (e.g., if the type of LBT corresponds to omnidirectional LBT, then the device may perform omnidirectional LBT).

[0438] With respect to one or more embodiments herein, in some instances, the first type of LBT is different from the second type of LBT.

[0439] With respect to one or more embodiments herein, in some instances, the first value for the LBT parameter is different than the second value for the LBT parameter.

[0440] With respect to one or more embodiments herein, in instances where a device (e.g., a UE and / or a base station) performs LBT on a value (e.g., a first value and / or a second value) of an LBT parameter transmitted for LBT, the device performs LBT with the LBT parameter set to the value. In instances where the device performs LBT on a first value of the LBT parameter transmitted for LBT, the device performs LBT with the LBT parameter set to the first value. Alternatively and / or additionally, in instances where the device performs LBT on a second value of the LBT parameter transmitted for LBT, the device performs LBT with the LBT parameter set to the second value. In instances where the LBT parameter is an energy detection threshold and the device performs LBT on the first value of the LBT parameter transmitted for LBT, the device performs LBT with the energy detection threshold set to the first value. Alternatively and / or additionally, in instances where the LBT parameter is an energy detection threshold and the device performs LBT on the second value of the LBT parameter transmitted for LBT, the device performs LBT with the energy detection threshold set to the second value. In an instance where the LBT parameter is a window size (e.g., a contention window size) and the device performs LBT for a first value of the LBT parameter transmitted for LBT, the device performs LBT with the window size set to the first value. Alternatively and / or additionally, in an instance where the LBT parameter is a window size (e.g., a contention window size) and the device performs LBT for a second value of the LBT parameter transmitted for LBT, the device performs LBT with the window size set to the second value.

[0441] With respect to one or more embodiments herein, in instances where a device (e.g., a UE and / or a base station) determines to perform LBT on a transmission (and / or performs LBT on a transmission), LBT may be performed (by the device) before performing the transmission. Alternatively and / or in addition, performing LBT on the transmission may include determining whether a channel and / or spectrum (e.g., on which the transmission is to be performed) is available for use. In one example, performing LBT (and / or determining whether the channel and / or spectrum is available for use) may include detecting the presence or absence of one or more signals on the channel and / or spectrum. The device may determine that the channel and / or spectrum is available for use based on detecting the absence of one or more signals on the channel and / or spectrum (e.g., detecting silence of the channel and / or spectrum). Detecting the absence of one or more signals on the channel and / or spectrum may include detecting no signal on the channel and / or spectrum. Alternatively and / or in addition, detecting the absence of one or more signals on the channel and / or spectrum may include detecting one or more signals on the channel and / or spectrum having one or more intensity levels less than a threshold intensity level (e.g., an energy detection threshold). The device may determine that a channel and / or spectrum is not available for use based on detecting the presence of one or more signals on the channel and / or spectrum (e.g., one or more signals having one or more intensity levels exceeding a threshold intensity level, such as an energy detection threshold). The device may perform a transmission upon and / or after determining that the channel and / or spectrum is quiet and / or available for use. In one example, the device may perform a transmission upon and / or after determining that the channel and / or spectrum is quiet and / or available for use for a certain time period (e.g., the time period may be based on, for example, a window size equal to the LBT, such as a contention window size for the LBT). In examples in which the channel and / or spectrum is determined to be unavailable for use, the device may delay the transmission (e.g., the transmission may be delayed until and / or after the time when the device determines that the channel and / or spectrum is available for use).

[0442] With respect to one or more embodiments herein, in instances where a device (e.g., a UE and / or a base station) determines not to perform LBT for a transmission (and / or does not perform LBT for a transmission), the device may perform the transmission without performing LBT. Alternatively and / or additionally, the transmission may be performed without determining whether a channel and / or spectrum (e.g., on which the transmission is performed) is available for use. Alternatively and / or additionally, the transmission (and / or the time at which the transmission is performed) may not be based on a determination of whether a channel and / or spectrum (e.g., on which the transmission is performed) is available for use. Alternatively and / or additionally, sensing may not be performed on the channel and / or spectrum (e.g., on which the transmission is performed) to determine whether to perform the transmission. Alternatively and / or additionally, the device may not attempt to detect the presence of one or more signals on the channel and / or spectrum (e.g., on which the transmission is performed) to determine whether to delay the transmission.

[0443] Throughout this disclosure, LBT may be replaced by a channel access scheme.

[0444] Throughout this disclosure, LBT may be replaced by a channel access mechanism.

[0445] Unless otherwise indicated, the present disclosure may describe the behavior and / or operation of a single serving cell. The techniques and / or systems provided herein may be applicable to the behavior and / or operation of a single serving cell. The techniques and / or systems provided herein may be implemented on a single serving cell.

[0446] Unless otherwise indicated, the present disclosure may describe the behavior and / or operation of multiple serving cells. The techniques and / or systems provided herein may be applicable to the behavior and / or operation of multiple serving cells. The techniques and / or systems provided herein may be implemented on multiple serving cells.

[0447] Unless otherwise indicated, the present disclosure may describe the behavior and / or operation of a single bandwidth portion. The techniques and / or systems provided herein may be applicable to the behavior and / or operation of a single bandwidth portion. The techniques and / or systems provided herein may be implemented on a single bandwidth portion.

[0448] Throughout this disclosure, unless otherwise indicated, a base station may configure multiple bandwidth parts for a UE (eg, the base station configures multiple bandwidth parts for a UE).

[0449] Throughout this disclosure, unless otherwise indicated, a base station may configure a single bandwidth portion for a UE (eg, the base station configures a single bandwidth portion for a UE).

[0450] Figure 6 600 according to an exemplary embodiment from the perspective of a UE. In step 605, the UE determines whether to perform LBT on the first transmission and / or how to perform LBT on the first transmission based on one or more properties of the first transmission. In one example, in step 605, based on the one or more properties of the first transmission, the UE may determine whether to perform LBT on the first transmission, and / or the UE may determine (in response to, for example, determining to perform LBT on the first transmission) which type of LBT to perform on the first transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0451] Return Reference Figure 3 and 4In an exemplary embodiment of the UE, the apparatus 300 includes program code 312 stored in the memory 310. The CPU 308 may execute the program code 312 to enable the UE to determine whether to perform LBT on the first transmission and / or how to perform LBT on the first transmission based on one or more properties of the first transmission. In addition, the CPU 308 may execute the program code 312 to perform one, some, and / or all of the above actions and steps and / or other actions and steps described herein.

[0452] Figure 7 FIG700 is a flowchart according to an exemplary embodiment from the perspective of a base station. In step 705, the base station determines whether to perform LBT on the first transmission and / or how to perform LBT on the first transmission based on one or more properties of the first transmission. In one example, in step 705, based on the one or more properties of the first transmission, the base station may determine whether to perform LBT on the first transmission, and / or the base station may determine (in response to, for example, determining to perform LBT on the first transmission) which type of LBT to perform on the first transmission (e.g., at least one of omnidirectional LBT, directional LBT, receiver-assisted LBT, a first type of LBT, a second type of LBT, LBT with a first value of an LBT parameter, LBT with a second value of an LBT parameter, etc.).

[0453] Return Reference Figure 3 and 4 In an exemplary embodiment of a base station, apparatus 300 includes program code 312 stored in memory 310. CPU 308 may execute program code 312 to enable the base station to determine whether to perform LBT on the first transmission and / or how to perform LBT on the first transmission based on one or more properties of the first transmission. In addition, CPU 308 may execute program code 312 to perform one, some, and / or all of the above-described actions and steps and / or other actions and steps described herein.

[0454] Relative to Figures 6 to 7 In one embodiment, the one or more properties of the first transmission include a priority of the first transmission.

[0455] In one embodiment, the one or more properties of the first transmission include a channel used for the first transmission. In an example, the first transmission includes transmission of information on a channel.

[0456] In one embodiment, the one or more properties of the first transmission include a signal for the first transmission. In an example, the first transmission includes transmission of information via a signal.

[0457] In one embodiment, the one or more properties of the first transmission include information carried by the first transmission (eg, information transmitted via the first transmission).

[0458] In one embodiment, determining whether to perform LBT on the first transmission includes determining to perform LBT on the first transmission based on a determination that the first transmission has a priority below a threshold (e.g., a threshold priority). For example, based on a determination that the priority of the first transmission is below the threshold, LBT can be performed on the first transmission.

[0459] In one embodiment, if the transmission has a priority below a threshold (eg, a threshold priority), then LBT is performed on the transmission.

[0460] In one embodiment, determining whether to perform LBT on the first transfer includes determining not to perform LBT on the first transfer based on a determination that the first transfer has a priority greater than a threshold (e.g., a threshold priority). For example, based on a determination that the priority of the first transfer is greater than the threshold, LBT may not be performed on the first transfer (e.g., the first transfer may be performed without LBT).

[0461] In one embodiment, if the transmission has a priority above a threshold (eg, a threshold priority), then LBT is not performed on the transmission.

[0462] In one embodiment, the threshold priority level is indicated to the UE and / or the base station (eg, by the second base station). For example, the second base station may transmit an indication of the threshold priority level to the UE (and / or the base station).

[0463] In one embodiment, the base station indicates a threshold priority to one or more UEs. For example, the base station may transmit an indication of the threshold priority to the one or more UEs.

[0464] In one embodiment, the threshold priority is defined (eg, predefined) and / or fixed (eg, the threshold priority is a fixed value).

[0465] In one embodiment, determining whether to perform LBT on the first transmission includes determining to perform LBT on the first transmission based on a determination that the first channel / signal is used for the first transmission, e.g., based on a determination that the first transmission includes transmission of information on a first channel of the first channel / signal and / or in a first signal of the first channel / signal. For example, based on the determination that the first channel / signal is used for the first transmission, LBT may be performed on the first transmission.

[0466] In one embodiment, if the first channel / signal is used for transmission, then LBT is performed on the transmission.

[0467] In one embodiment, determining whether to perform LBT on the first transmission includes determining not to perform LBT on the first transmission based on a determination that the second channel / signal is used for the first transmission, e.g., based on a determination that the first transmission includes transmission of information on a second channel of the second channel / signal and / or in a second signal of the second channel / signal. For example, based on the determination that the second channel / signal is used for the first transmission, LBT may not be performed on the first transmission (e.g., the first transmission may be performed without LBT).

[0468] In one embodiment, if the second channel / signal is used for transmission, then LBT is not performed for the transmission.

[0469] In one embodiment, determining whether to perform LBT on the first transmission includes determining to perform LBT on the first transmission based on a determination that a data channel is used for the first transmission, e.g., based on a determination that the first transmission includes transmission of information on a data channel. An example of a data channel may be a PUSCH. Another example of a data channel may be a PDSCH. The data channel may be a unicast data channel. The data channel may carry user plane data. The data channel may be scheduled by a control channel. For example, based on a determination that the data channel is used for the first transmission, LBT may be performed on the first transmission.

[0470] In one embodiment, if the data channel is used for transmission, LBT is performed for the transmission.

[0471] In one embodiment, determining whether to perform LBT on the first transmission includes determining not to perform LBT on the first transmission based on a determination that the control channel / signal is for the first transmission, e.g., based on a determination that the first transmission includes transmission of information on a control channel of the control channel / signal and / or in a control signal of the control channel / signal. For example, based on the determination that the control channel / signal is for the first transmission, LBT may not be performed on the first transmission (e.g., the first transmission may be performed without LBT).

[0472] In one embodiment, if a control channel / signal is used for transmission, then LBT is not performed for the transmission.

[0473] In one embodiment, the control channel of the control channel / signal may be at least one of a PUCCH, a PDCCH, etc. The control signal of the control channel / signal may be at least one of a PUCCH signal, a PDCCH signal, etc.

[0474] In one embodiment, determining whether to perform LBT on the first transmission includes determining to perform LBT on the first transmission based on a determination that the first information is carried by the first transmission, e.g., based on a determination that the first transmission includes a transmission of the first information. For example, based on a determination that the first information is carried by the first transmission, LBT may be performed on the first transmission.

[0475] In one embodiment, if the first information is carried by a transmission, then LBT is performed on the transmission.

[0476] In one embodiment, determining whether to perform LBT on the first transmission includes determining not to perform LBT on the first transmission based on a determination that the second information is carried by the first transmission, e.g., based on a determination that the first transmission includes a transmission of the second information. For example, based on a determination that the second information is carried by the first transmission, LBT may not be performed on the first transmission (e.g., the first transmission may be performed without LBT).

[0477] In one embodiment, if the second information is carried by the transmission, then LBT is not performed on the transmission.

[0478] In one embodiment, determining whether to perform LBT on the first transmission includes determining to perform LBT on the first transmission based on a determination that broadcast information is carried by the first transmission, e.g., based on a determination that the first transmission includes a transmission of the broadcast information. For example, based on a determination that the broadcast information is carried by the first transmission, LBT may be performed on the first transmission.

[0479] In one embodiment, if the broadcast information is carried by a transmission, LBT is performed on the transmission.

[0480] In one embodiment, determining whether to perform LBT on the first transmission includes determining not to perform LBT on the first transmission based on a determination that unicast information is carried by the first transmission, e.g., based on a determination that the first transmission includes a transmission of unicast information. For example, based on a determination that unicast information is carried by the first transmission, LBT may not be performed on the first transmission (e.g., the first transmission may be performed without LBT).

[0481] In one embodiment, if unicast information is carried by a transmission, then LBT is not performed for the transmission.

[0482] Figure 8Flowchart 800 is a diagram according to an exemplary embodiment, as viewed from the perspective of a UE. In step 805, the UE performs a first transmission without LBT, wherein the first transmission is a preamble transmission (e.g., the first transmission includes a preamble). For example, the UE does not perform LBT on the first transmission. In one example, the UE may perform the first transmission without performing LBT to determine whether a channel and / or spectrum (e.g., on which the first transmission is performed) is available for use. Alternatively and / or additionally, the first transmission (and / or the time at which the UE performs the first transmission) may not be based on LBT and / or may not be based on a determination of whether a channel and / or spectrum (e.g., on which the first transmission is performed) is available for use. Alternatively and / or additionally, the UE may not attempt to detect the presence of one or more signals on the channel and / or spectrum (e.g., on which the first transmission is performed) to determine whether to delay the first transmission. In step 810, the UE performs LBT on a second transmission for a signal other than a preamble (e.g., a signal other than a preamble that does not include a preamble and the second transmission does not include a preamble). In one example, the UE performs a second transmission (e.g., the second transmission includes transmitting a signal in addition to a preamble). In one example, LBT for the second transmission is performed before performing the second transmission. In one example, performing LBT for the second transmission includes determining whether a channel and / or spectrum (e.g., on which the second transmission is to be performed) is available for use. In one example, performing LBT (and / or determining whether the channel and / or spectrum is available for use) may include detecting the presence or absence of one or more signals on the channel and / or spectrum. The UE may determine that the channel and / or spectrum is available for use based on detecting the absence of one or more signals on the channel and / or spectrum (e.g., detecting silence on the channel and / or spectrum). Detecting the absence of one or more signals on the channel and / or spectrum may include detecting no signal on the channel and / or spectrum. Alternatively and / or in addition, detecting the absence of one or more signals on the channel and / or spectrum may include detecting one or more signals on the channel and / or spectrum having one or more strength levels less than a threshold strength level. The UE may determine that the channel and / or spectrum is unavailable for use based on detecting the presence of one or more signals on the channel and / or spectrum (e.g., one or more signals having one or more strength levels exceeding a threshold strength level). The UE may perform the second transmission when and / or after determining that the channel and / or spectrum is available for use. In instances where it is determined that the channel and / or spectrum is not available for use, the UE may delay the second transmission (e.g., the second transmission may be delayed until and / or after the UE determines that the channel and / or spectrum is available for use).

[0483] In one embodiment, the signal other than the preamble is an SRS. In one example, the second transmission includes a transmission of the SRS.

[0484] In one embodiment, the signal other than the preamble is a PUCCH (eg, a PUCCH signal).In one example, the second transmission includes a transmission of the PUCCH.

[0485] In one embodiment, the UE operates in a shared spectrum (eg, an unlicensed spectrum). In an example, the UE performs the first transmission and the second transmission in the shared spectrum.

[0486] In one embodiment, the UE determines whether to perform LBT on a transmission based on whether the transmission is a preamble transmission (e.g., based on whether the transmission includes a preamble). In one example, the UE may determine to perform LBT on the transmission based on a determination that the transmission is not a preamble transmission (e.g., a transmission that includes a signal other than a preamble and / or a transmission that does not include a preamble). In one example, the UE may determine not to perform LBT on the transmission based on a determination that the transmission is a preamble transmission (e.g., a transmission that includes a preamble).

[0487] In one embodiment, if the transmission is a preamble transmission (eg, if the transmission includes a preamble transmission), the UE performs the transmission without LBT.

[0488] In one embodiment, the UE performs the first transmission without LBT based on the first transmission being a preamble transmission (eg, the UE performs the first transmission without LBT based on the first transmission including a preamble transmission).

[0489] In one embodiment, if the transmission is not a preamble transmission (eg, if the transmission does not include a preamble), the UE performs LBT on the transmission.

[0490] In one embodiment, the UE performs LBT on the second transmission based on the second transmission not being a preamble transmission (eg, the UE performs LBT on the second transmission based on the second transmission not including transmission of a preamble).

[0491] In one embodiment, if the transmission is an SRS transmission (eg, if the transmission includes a transmission of SRS), the UE performs LBT for the transmission.

[0492] In one embodiment, the UE performs LBT on the second transmission based on the second transmission being an SRS transmission (eg, the UE performs LBT on the second transmission based on the second transmission comprising transmission of the SRS).

[0493] In one embodiment, if the transmission is a PUCCH transmission (eg, if the transmission includes a transmission of PUCCH), the UE performs LBT for the transmission.

[0494] In one embodiment, the UE performs LBT on the second transmission based on the second transmission being a PUCCH transmission (eg, the UE performs LBT on the second transmission based on the second transmission comprising transmission of a PUCCH).

[0495] In one embodiment, the first transmission and the second transmission are on the same serving cell.

[0496] In one embodiment, the first transmission and the second transmission are on the same frequency spectrum.

[0497] In one embodiment, the first transmission and the second transmission are on the same carrier.

[0498] Return Reference Figure 3 and 4 In an exemplary embodiment of a UE, apparatus 300 includes program code 312 stored in memory 310. CPU 308 may execute program code 312 to enable the UE to: (i) perform a first transmission without LBT, where the first transmission is a preamble transmission, and (ii) perform LBT on a second transmission for a signal other than a preamble. In addition, CPU 308 may execute program code 312 to perform one, some, and / or all of the above actions and steps and / or other actions and steps described herein.

[0499] Figure 9Flowchart 900 is a diagram according to an exemplary embodiment from the perspective of a UE. In step 905, the UE transmits a first signal on a channel without sensing the channel, wherein the first signal includes a preamble (e.g., the first signal is a preamble). In one example, before transmitting the first signal, the UE does not sense the channel to determine whether the channel is available for use (e.g., available for use in transmitting the first signal). In one example, the UE transmits the first signal without determining whether the channel is available for use in transmitting the first signal. In one example, the UE does not sense the channel for use in transmitting the first signal. In step 910, the UE senses the channel for transmission of a second signal, wherein the second signal does not include a preamble. In one example, transmission of the second signal does not include transmission of a preamble. In step 915, the UE transmits a second signal on the channel after sensing the channel. In one example, the UE transmits the second signal in response to sensing the channel. In one example, sensing the channel for transmission of the second signal is performed to determine whether the channel (e.g., on which the second signal transmission is to be performed) is available for use. In one example, the UE may sense the channel to detect the presence or absence of one or more signals on the channel. The UE may determine that a channel is available for use based on detecting (via sensing the channel) that one or more signals are not present on the channel (e.g., detecting silence of the channel). Detecting that the one or more signals are not present on the channel may include detecting that there is no signal on the channel. Alternatively and / or in addition, detecting that the one or more signals are not present on the channel may include detecting one or more signals on the channel having one or more strength levels less than a threshold strength level. The UE may determine that a channel is not available for use based on detecting (via sensing the channel) that one or more signals are present on the channel (e.g., one or more signals having one or more strength levels exceeding a threshold strength level). The UE may perform transmission of the second signal upon and / or after determining that the channel is available for use. In instances where it is determined that the channel is not available for use, the UE may delay transmission of the second signal (e.g., transmission of the second signal may be delayed until and / or after the time when the UE determines that the channel is available for use).

[0500] In one embodiment, the second signal is an SRS.

[0501] In one embodiment, the second signal is a PUCCH (eg, a PUCCH signal).

[0502] In one embodiment, the UE operates in a shared spectrum (eg, an unlicensed spectrum). In an example, the UE transmits a first signal and a second signal in the shared spectrum.

[0503] In one embodiment, the UE determines whether to sense the channel for transmission (e.g., transmission on the channel) based on whether the transmission is a preamble transmission (e.g., based on whether the transmission includes a preamble). In one example, the UE may determine to sense the channel for transmission (e.g., transmission on the channel) based on a determination that the transmission is not a preamble transmission (e.g., a transmission including a signal other than a preamble and / or a transmission not including a preamble). In one example, the UE may determine not to sense the channel for transmission (e.g., transmission on the channel) based on a determination that the transmission is a preamble transmission (e.g., a transmission including a preamble).

[0504] In one embodiment, if the transmission is a preamble transmission, the UE performs the transmission on the channel without sensing the channel (eg, without sensing the channel for the transmission).

[0505] In one embodiment, the UE transmits the first signal on the channel without sensing the channel based on the first signal including the preamble.

[0506] In one embodiment, if the transmission is not a preamble transmission, the UE performs the transmission (eg, transmission on the channel) after sensing the channel (eg, after sensing the channel for transmission).

[0507] In one embodiment, the UE senses the channel for transmission of the second signal based on the second signal not including a preamble (eg, based on the transmission of the second signal not including transmission of a preamble).

[0508] In one embodiment, the first signal and the second signal are transmitted on the same serving cell.

[0509] In one embodiment, the first signal and the second signal are transmitted on the same frequency spectrum.

[0510] In one embodiment, the first signal and the second signal are transmitted on the same carrier.

[0511] Return Reference Figure 3 and 4 In an exemplary embodiment of a UE, apparatus 300 includes program code 312 stored in memory 310. CPU 308 may execute program code 312 to enable the UE to: (i) transmit a first signal on a channel without sensing the channel, wherein the first signal includes a preamble; (ii) sense the channel for transmission of a second signal, wherein the second signal does not include a preamble; and (iii) transmit the second signal on the channel after sensing the channel. In addition, CPU 308 may execute program code 312 to perform one, some, and / or all of the above actions and steps and / or other actions and steps described herein.

[0512] Relative to about Figures 8 to 9 In one or more of the provided embodiments, in some instances, the preamble may be replaced by a type of signal other than the preamble, such as at least one of an SRS, a PUCCH signal, a PUSCH signal, etc. In one instance, the UE may perform transmission of a signal on the channel without performing LBT on the transmission (and / or without sensing the channel for the transmission) based on the signal being a signal of the type. In one instance, the UE may perform LBT on the transmission (and / or may sense the channel) based on the transmission including transmission of a signal other than the type of signal (and / or based on the transmission not including transmission of a signal that is a signal of the type).

[0513] A communication device (e.g., UE, base station, network node, etc.) may be provided, wherein the communication device may include a control circuit, a processor installed in the control circuit, and / or a memory installed in the control circuit and coupled (e.g., operatively coupled) to the processor. The processor may be configured to execute program code stored in the memory to perform Figures 6 to 9 Furthermore, the processor may execute program code to perform one, some, and / or all of the above actions and steps and / or other actions and steps described herein.

[0514] A computer readable medium may be provided. The computer readable medium may be a non-transitory computer readable medium. The computer readable medium may include a flash memory device, a hard drive, a disk (e.g., a magnetic disk and / or optical disk, such as at least one of a digital versatile disc (DVD), a compact disc (CD), etc.), and / or a memory semiconductor, such as at least one of a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), etc. The computer readable medium may include processor executable instructions that, when executed, cause the execution of Figures 6 to 9 One, some and / or all of the method steps shown in the , and / or one, some and / or all of the above actions and steps and / or other actions and steps described herein.

[0515] It will be appreciated that applying one or more of the techniques presented herein may result in one or more benefits, including but not limited to increased efficiency and / or increased communication speed between devices (e.g., UEs and / or base stations). The increased efficiency and / or increased speed may be a result of enabling a device to more efficiently perform channel access and / or transmission with or without LBT and / or with different types of LBT. Alternatively and / or in addition, the increased efficiency and / or increased speed may be a result of enabling a device to determine whether to perform LBT and / or select the type of LBT for channel access and / or transmission.

[0516] Various aspects of the present disclosure have been described above. It should be understood that the teachings herein can be implemented in a wide variety of forms, and any specific structure, function, or both disclosed herein are merely representative. Based on the teachings herein, those skilled in the art will appreciate that the aspects disclosed herein can be implemented independently of any other aspects, and that two or more of these aspects can be combined in various ways. For example, a device or method can be implemented using any number of the aspects described herein. Furthermore, the device or method can be implemented using other structures, functionalities, or structures and functionalities in addition to or different from one or more of the aspects described herein. As examples of some of the above concepts, in some aspects, parallel channels can be established based on pulse repetition frequency. In some aspects, parallel channels can be established based on pulse position or offset. In some aspects, parallel channels can be established based on time hopping sequences. In some aspects, parallel channels can be established based on pulse repetition frequency, pulse position or offset, and time hopping sequences.

[0517] Those skilled in the art will understand that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented using voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0518] Those skilled in the art will further appreciate that the various illustrative logical blocks, modules, processors, components, circuits, and algorithm steps described in connection with the various aspects disclosed herein may be implemented as electronic hardware (e.g., a digital implementation that may be designed using source decoding or some other technique, an analog implementation, or a combination of the two), various forms of program or design code incorporating instructions (which, for convenience, may be referred to herein as "software" or "software modules"), or a combination of the two. To clearly illustrate the interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

[0519] In addition, the various illustrative logical blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented within or performed by an integrated circuit ("IC"), an access terminal, or an access point. The IC may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof designed to perform the functions described herein, and may execute code or instructions residing within the IC, external to the IC, or both. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0520] It should be understood that any specific order or hierarchy of steps in any disclosed process is an example of a sample approach. Based on design preferences, it should be understood that the specific order or hierarchy of steps in a process can be rearranged while remaining within the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order and are not meant to be limited to the specific order or hierarchy presented.

[0521] The steps of the methods or algorithms described in conjunction with the various aspects disclosed herein can be implemented directly in hardware, in software modules executed by a processor, or in a combination of the two. The software modules (e.g., containing executable instructions and associated data) and other data can reside in a data storage device, such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of computer-readable storage medium known in the art. An example storage medium can be coupled to a machine such as a computer / processor (for convenience, the machine may be referred to herein as a "processor") so that the processor can read information (e.g., code) from the storage medium and write information to the storage medium. An example storage medium can be integrated with the processor. The processor and storage medium may reside in an ASIC. The ASIC may reside in a user device. In an alternative, the processor and storage medium may reside in a user device as discrete components. Alternatively and / or in addition, in some aspects, any suitable computer program product may include a computer-readable medium that includes code related to one or more aspects of the present disclosure. In some aspects, a computer program product may include packaging materials.

[0522] While the disclosed subject matter has been described in conjunction with various aspects, it will be understood that the disclosed subject matter is capable of further modification. This application is intended to cover any variations, uses, or adaptations of the disclosed subject matter that generally follow the principles of the disclosed subject matter and include departures from the present disclosure that come within known and customary practice in the art to which the disclosed subject matter pertains.

[0523] CROSS-REFERENCE TO RELATED APPLICATIONS

[0524] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 139,529, filed on January 20, 2021, the complete disclosure of which is incorporated herein by reference in its entirety.

Claims

1. A method for a user device, characterized in that: The method comprises: performing a first transmission without listen-before-talk, wherein the first transmission is a PRACH transmission; and Listen before talk is performed for the second transmission of signals other than PRACH, The method further comprises: Whether to perform listen-before-talk for a transmission is determined based on whether the transmission is a PRACH transmission.

2. The method according to claim 1, wherein: The signal other than the PRACH is a sounding reference signal.

3. The method according to claim 1, wherein: The signal other than the PRACH is a physical uplink control channel.

4. The method according to claim 1, wherein: The user equipment operates in a shared spectrum.

5. The method according to claim 1, wherein: Performing the first transmission without listen-before-talk is based on the first transmission being a PRACH transmission.

6. The method according to claim 1, wherein: Performing listen-before-talk for the second transmission is based on the second transmission not being a PRACH transmission.

7. The method according to claim 1, wherein: Performing listen-before-talk for the second transmission is based on the second transmission being a sounding reference signal transmission.

8. The method according to claim 1, wherein: Performing listen before talk for the second transmission is based on the second transmission being a physical uplink control channel transmission.

9. A method for a user device, characterized in that: The method comprises: transmitting a first signal on a channel without sensing the channel, wherein the first signal comprises a PRACH; sensing the channel for transmission of a second signal, wherein the second signal does not include a PRACH; and transmitting the second signal on the channel after sensing the channel, The method further comprises: Whether to sense the channel for the transmission on the channel is determined based on whether the transmission on the channel is a PRACH transmission.

10. The method according to claim 9, characterized in that: The second signal is a sounding reference signal.

11. The method according to claim 9, wherein: The second signal is a physical uplink control channel.

12. The method according to claim 9, wherein: The user equipment operates in a shared spectrum.

13. The method according to claim 9, wherein: Transmitting the first signal on the channel without sensing the channel is performed based on the first signal including a PRACH.

14. The method according to claim 9, wherein: Sensing the channel for the transmission of the second signal is performed based on the second signal not including a PRACH.

15. A user equipment, characterized in that: include: control circuit; a processor installed in the control circuit; as well as a memory installed in the control circuit and coupled to the processor, wherein the processor is configured to execute program code stored in the memory to perform operations, the operations comprising: transmitting a first signal on a channel without sensing the channel, wherein the first signal comprises a PRACH; sensing the channel for transmission of a second signal, wherein the second signal does not include a PRACH; and transmitting the second signal on the channel after sensing the channel, The operations further include: Whether to sense the channel for the transmission on the channel is determined based on whether the transmission on the channel is a PRACH transmission.

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