KR20220038355A - Techniques for updating contention window size - Google Patents

Abstract

Techniques for defining one or more reference transmissions and a reference duration utilized for contention window update are provided to address these new features. An apparatus, such as a wireless device, determines a reference duration of a channel occupancy time (COT), the reference duration being based at least in part on subcarrier spacing (SCS) and based on reception of a physical downlink shared channel (PDSCH) transmission. The apparatus updates a contention window (CW) based at least in part on reception of the PDSCH transmission during the reference duration. For example, the device may increase the CW when a negative acknowledgment (NACK) is received for the PDSCH determined in the COT, and a predetermined minimum value (CW_min) to the CW when a positive acknowledgment (ACK) is received for the determined PDSCH can be assigned

Description

Techniques for updating contention window size

[0001] This application is entitled Indian Application Serial No. 201941031137, entitled "Techniques for Determining Contention Window Update", filed on August 1, 2019, and "Techniques for Determining Contention Window Update", filed on June 16, 2020 Priority is claimed to U.S. Patent Application Serial No. 16/903,226, which is expressly incorporated herein by reference in its entirety.

[0002] TECHNICAL FIELD This disclosure relates generally to communication systems, and more particularly, to techniques for determining a wireless communication that includes a contention window.

[0003] BACKGROUND Wireless communication systems are widely deployed to provide a variety of communication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may use multiple-access technologies that may support communication with multiple users by sharing available system resources. Examples of such multiple access technologies are code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, SC- single-carrier frequency division multiple access (FDMA) systems and time division synchronous code division multiple access (TD-SCDMA) systems.

[0004] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a city, national, regional, and even global level. An example of a telecommunication standard is 5G New Radio (NR). 5G NR is promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements related to latency, reliability, security, scalability (eg, with the Internet of Things (IoT)) and other requirements. It is part of the ongoing mobile broadband evolution. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low-latency communications (URLLCs).

[0005] Licensed Assisted Access (LAA) brings licensed and unlicensed spectrum together, creating a higher capacity than can be provided by licensed spectrum alone. Increasing network capacity is essential to handle the exponential growth of data traffic in cellular networks. LAA of 5G NR-U (new radio, unlicensed) has new requirements and features.

[0006] The following description presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an exhaustive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

[0007] Techniques for adjusting or updating a contention window (CW) are provided.

[0008] A user equipment (UE) may be configured to implement one or more techniques for determining reference transmissions for CW update or adjustment. The UE may use such determination techniques to determine one or more uplink reference transmissions for use in adjusting or updating the UE's CW. Techniques for determining the reference transmission may include directly determining the reference transmission, or determine the reference transmission by first determining a reference duration and then determining the reference transmission based at least in part on the determined reference duration. may include doing

[0009] The base station may be configured to implement one or more techniques for determining reference transmissions for CW update or adjustment. Specifically, the base station may use reference transmission determination techniques to determine one or more downlink reference transmissions for use in adjusting or updating the base station's CW. Techniques for determining the reference transmission may determine the reference transmission directly, or may determine the reference transmission by first determining the reference duration and then determining the reference transmission based at least in part on the determined reference duration.

[0010] Once the reference signal is determined, the transmitting node may monitor the success or failure of the transmitted reference signal (eg, ACKs or NACKs transmitted by the receiving node). Then, the transmitting node may use the success or failure of the receiving node to receive the transmitted reference signal and selectively adjust the CW of the transmitting node.

[0011] In an aspect of the present disclosure, a method, computer readable medium, and apparatus for wireless communication are provided. The device may determine a reference duration of a channel occupancy time (COT), the reference duration being based at least in part on subcarrier spacing (SCS) and based on reception of a physical downlink shared channel (PDSCH) transmission. The apparatus may update the CW based at least in part on reception of the PDSCH transmission during the reference duration.

[0012] In another aspect of the present disclosure, a method, computer readable medium, and apparatus for wireless communication in a base station are provided. The base station may determine a reference duration of the COT, the reference duration being based at least in part on the SCS. The base station may further determine at least one reference physical downlink control channel (PDCCH) transmission to be transmitted during the reference duration. The base station may further update the CW based, at least in part, on the uplink transmission having at least one reference PDCCH transmission transmitted during the reference duration.

[0013] In another aspect of the present disclosure, a method, computer readable medium, and apparatus for wireless communication in a base station are provided. The base station may determine the reference duration of the COT. The base station may further determine whether to use the reference PDSCH transmission or the reference physical uplink shared channel (PUSCH) transmission to update the CW. The base station may further update the CW based on the PDSCH or reference PUSCH transmission and reference duration.

[0014] In another aspect of the present disclosure, a method, computer readable medium, and apparatus for wireless communication in a UE are provided. The UE may determine the reference duration of the COT based on the first slot of the most recent set of uplink shared channel transmissions during the COT. The UE may update the CW based at least in part on the uplink shared channel transmission for the reference duration. Uplink shared channel transmissions may include, for example, discontinuous uplink shared channel transmissions. The CW may be updated further based on downlink transmission, eg, during COT.

[0015] To the achievement of the above and related objects, one or more aspects comprise the features hereinafter fully described and particularly recited in the claims. The following description and accompanying drawings set forth in detail certain illustrative features of one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of the various aspects may be used, and this description is intended to include all such aspects and their equivalents.

1 is a diagram illustrating an example of a wireless communication system and an access network;
2A, 2B, 2C and 2D are respectively a first 5G/NR frame, DL channels in a 5G/NR subframe, a second 5G/NR frame, and a UL in a 5G/NR subframe; Diagrams illustrating examples of channels.
3 is a diagram illustrating an example of a base station and user equipment (UE) in an access network.
4 illustrates a call flow using contention window (CW) sizing techniques in accordance with some implementations.
5 illustrates various techniques for determining a reference duration (RD), reference signals, and CW size in accordance with some implementations.
6A illustrates a technique for determining a reference duration in slot units according to an example.
6B illustrates a technique for determining a reference duration in symbol units scheduling according to another example.
7A illustrates a technique for determining a reference signal based at least in part on a reference duration and a starting point of the reference signal, according to an example.
7B illustrates a technique for determining a reference signal based at least in part on a reference duration and an endpoint of the reference signal, according to another example.
7C illustrates a technique for determining a reference signal based at least in part on a reference duration, a start point of the reference signal, and an end point of the reference signal, according to another example.
8A illustrates a technique for determining a reference duration when a PDSCH is punctured according to an example.
8B illustrates a technique for determining a reference duration when a PDSCH is punctured according to another example.
9A illustrates a technique for determining a reference duration when a PDSCH is subband punctured according to an example.
9B illustrates a technique for determining a reference duration when a PDSCH is subband punctured according to another example.
10 illustrates one or more reference signals determined directly from a predetermined number of symbols or a predetermined time of a first slot, according to an example.
11 illustrates a UE-initiated COT having a category 4 listen before talk (LBT) to which a UE-side CW size adjustment technique according to an example may be applied.
12 is a flowchart of a wireless communication method according to a first example.
13 is a flowchart of a wireless communication method according to a second example.
14 is a flowchart of a wireless communication method according to a third example.
15 is a flowchart of a wireless communication method according to a fourth example.
16 is a data flow diagram illustrating the data flow between different means/components in an exemplary apparatus;
17 is a diagram illustrating an example of a hardware implementation for an apparatus using a processing system.
18 is a data flow diagram illustrating data flow between different means/components in an exemplary apparatus;
19 is a diagram illustrating an example of a hardware implementation for an apparatus using a processing system.

[0040] DETAILED DESCRIPTION The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. It will be apparent, however, to one skilled in the art, that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

[0041] Some aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the detailed description that follows, in which various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as “elements”) in the accompanying drawings are will be exemplified by These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0042] By way of example, an element, or any portion of an element, or any combination of elements may be implemented as a “processing system” that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors. , systems on a chip (SoC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and throughout this disclosure. and other suitable hardware configured to perform the various functionalities described throughout. One or more processors in the processing system may execute software. Software, whether referred to as software, firmware, middleware, microcode, hardware descriptor, or otherwise referred to as instructions, instruction sets, code, code segments, program code , programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executable, threads of execution, procedures, functions, etc. will be interpreted broadly to mean

[0043] Accordingly, in one or more examples, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media include random-access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, It may include combinations of computer-readable media of the types described above, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0044] 1 is a diagram illustrating an example of a wireless communication system and access network 100 . A wireless communication system (also referred to as a wireless wide area network (WWAN)) includes base stations 102 , UEs 104 , an Evolved Packet Core (EPC) 160 , and another core network 190 (eg, 5GC). (5G Core)). Base stations 102 may include macrocells (high power cellular base stations) and/or small cells (low power cellular base stations). Macrocells include base stations. Small cells include femtocells, picocells and microcells.

[0045] Base stations 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (E-UTRAN) Terrestrial Radio Access Network (E-UTRAN)) are configured for EPC via backhaul links 132 (eg, S1 interface). may interface with 160 . Base stations 102 configured for 5G NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with the core network 190 via backhaul links 184 . In addition to other functions, base stations 102 may perform one or more of the following functions: delivery of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (eg, handover, dual connectivity), inter-cell interference coordination, connection setup and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, Multimedia broadcast multicast service (MBMS), subscriber and equipment tracking, RAN information management (RIM), paging, positioning and delivery of alert messages. Base stations 102 may communicate with each other directly or indirectly (eg, via EPC 160 or core network 190 ) via backhaul links 134 (eg, X2 interface). The backhaul links 134 may be wired or wireless.

[0046] Base stations 102 may communicate wirelessly with UEs 104 . Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110 . There may be overlapping geographic coverage areas 110 . For example, the small cell 102 ′ may have a coverage area 110 ′ that overlaps the coverage area 110 of one or more macro base stations 102 . A network comprising both small cells and macrocells may be known as a heterogeneous network. A heterogeneous network may also include HeNBs (Home Evolved Node Bs), which may serve a limited group known as a closed subscriber group (CSG). Communication links 120 between base stations 102 and UEs 104 are uplink (UL) (also referred to as reverse link) transmissions and/or base station from UE 104 to base station 102 . downlink (DL) (also referred to as forward link) transmissions from 102 to UE 104 . Communication links 120 may use multiple-input and multiple-output (MIMO) antenna techniques including spatial multiplexing, beamforming, and/or transmit diversity. Communication links may be over one or more carriers. Base stations 102/UEs 104 are configured for a maximum of Y MHz per carrier (eg 5 , 10, 15, 20, 100, 400 MHz, etc.) bandwidths of the spectrum can be used. The carriers may or may not be adjacent to each other. The assignment of carriers may be asymmetric with respect to DL and UL (eg, more or fewer carriers may be assigned to DL than to UL). Component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

[0047] Certain UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158 . The D2D communication link 158 may use the DL/UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). D2D communication may be achieved through various wireless D2D communication systems such as FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE or NR, for example.

[0048] The wireless communication system may further include a Wi-Fi access point (AP) 150 that communicates with Wi-Fi stations (STAs) 152 over communication links 154 in the 5 GHz unlicensed frequency spectrum. When communicating in the unlicensed frequency spectrum, the STAs 152/AP 150 may perform clear channel assessment (CCA) prior to communicating to determine whether a channel is available.

[0049] Small cell 102' may operate in licensed and/or unlicensed frequency spectrum. When operating in the unlicensed frequency spectrum, the small cell 102 ′ uses NR and may use the same 5 GHz unlicensed frequency spectrum used by the Wi-Fi AP 150 . A small cell 102 ′ using NR in the unlicensed frequency spectrum may boost the coverage of the access network and/or increase the capacity of the access network.

[0050] Whether a small cell 102 ′ or a large cell (eg, a macro base station), the base station 102 may include an eNB, gNB (gNodeB) or other type of base station. Some base stations, such as gNB 180 , may operate in the traditional sub 6 GHz spectrum, in millimeter wave (mmW) frequencies, and/or in near mmW frequencies when communicating with UE 104 . When the gNB 180 operates at mmW or near mmW frequencies, the gNB 180 may be referred to as a mmW base station. Extremely high frequency (EHF) is the part of RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength of 1 millimeter to 10 millimeters. Radio waves in the band may be referred to as millimeter waves. Near mmW can extend down to a frequency of 3 GHz with a wavelength of 100 millimeters. The super high frequency (SHF) band extends from 3 GHz to 30 GHz (also referred to as centimeter wave). Communications using the mmW/near mmW radio frequency band (eg, 3 GHz - 300 GHz) have very high path loss and short range. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for very high path loss and short distance.

[0051] The base station 180 may transmit the beamformed signal to the UE 104 in one or more transmission directions 182 ′. UE 104 may receive a beamformed signal from base station 180 in one or more receive directions 182 ″. UE 104 may also transmit a beamformed signal to base station 180 in one or more transmission directions. The base station 180 may receive a beamformed signal from the UE 104 in one or more reception directions. Base station 180 / UE 104 may perform beam training to determine the best receive and transmit directions for each of base station 180 / UE 104 . The transmit and receive directions for base station 180 may or may not be the same. The transmit and receive directions for the UE 104 may or may not be the same.

[0052] The EPC 160 is a Mobility Management Entity (MME) 162 , other MMEs 164 , a serving gateway 166 , an MBMS gateway 168 , a Broadcast Multicast Service Center (BM-SC) 170 and a Packet (PDN). Data Network) gateway 172 may be included. The MME 162 may communicate with a Home Subscriber Server (HSS) 174 . MME 162 is a control node that processes signaling between UEs 104 and EPC 160 . In general, the MME 162 provides bearer and connection management. All user Internet protocol (IP) packets are passed through the serving gateway 166 which itself connects to the PDN gateway 172 . The PDN gateway 172 provides UE IP address assignment as well as other functions. PDN gateway 172 and BM-SC 170 are connected to IP services 176 . IP services 176 may include the Internet, Intranet, IP Multimedia Subsystem (IMS), PS streaming service, and/or other IP services. BM-SC 170 may provide functions for MBMS user service provisioning and delivery. BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a public land mobile network (PLMN), and may It can be used for scheduling. The MBMS gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area that broadcast a specific service, and may be used for session management (start/stop) and eMBMS-related tasks. You may be responsible for collecting billing information.

[0053] The core network 190 may include an Access and Mobility Management Function (AMF) 192 , other AMFs 193 , a Session Management Function (SMF) 194 , and a User Plane Function (UPF) 195 . The AMF 192 may communicate with a Unified Data Management (UDM) 196 . The AMF 192 is a control node that processes signaling between the UEs 104 and the core network 190 . In general, AMF 192 provides QoS flow and session management. All user Internet protocol (IP) packets are passed through UPF 195 . UPF 195 provides UE IP address assignment as well as other functions. UPF 195 is coupled to IP services 197 . IP services 197 may include the Internet, Intranet, IP Multimedia Subsystem (IMS), PS streaming service, and/or other IP services.

[0054] A base station is a gNB, Node B, evolved Node B (eNB), access point, base transceiver station, radio base station, radio transceiver, transceiver function unit, basic service set (BSS), extended service set (ESS), transmit reception point (TRP) ) or some other suitable terminology. Base station 102 provides an access point to EPC 160 or core network 190 for UE 104 . Examples of UEs 104 include cellular phone, smart phone, session initiation protocol (SIP) phone, laptop, personal digital assistant (PDA), satellite radio, global positioning system, multimedia device, video device, digital Audio players (eg MP3 players), cameras, game consoles, tablets, smart devices, wearable devices, vehicles, electricity meters, gas pumps, large or small kitchen appliances, healthcare devices, implants, sensors/ actuators, displays, or any other similar functional device. Some of the UEs 104 may be referred to as IoT devices (eg, parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). UE 104 may be a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, It may also be referred to as a remote terminal, handset, user agent, mobile client, client, or some other suitable term.

[0055] Referring back to FIG. 1 , in certain aspects, the UE 104 is a contention window component configured to implement one or more techniques for determining a CW update/adjustment, which may include determining a reference transmission to determine a CW update. (199) may be included. Referring again to FIG. 1 , in other aspects, the base station 102/180 is a contention window component 198 configured to determine a CW update or adjustment, which may include, for example, determining a reference transmission to determine a CW update. may include

[0056] These reference transmission determination techniques, which may be used by contention window components 198 , 199 and described in greater detail below, enable determination of transmitted signals for use in performing a CW update or adjustment. These techniques may be particularly important to support coordination and update of CW at UE 104 or base station 102/180. Although the following description may focus on 5G NR, the techniques and concepts described herein apply to LTE, LTE-A, and other radio technologies for which the UE 104 or base station 102 needs to determine CW adjustments. It may be applicable to other similar areas such as

[0057] 2A is a diagram 200 illustrating an example of a first subframe within a 5G/NR frame structure. 2B is a diagram 230 illustrating an example of DL channels within a 5G/NR subframe. 2C is a diagram 250 illustrating an example of a second subframe within a 5G/NR frame structure. 2D is a diagram 280 illustrating an example of UL channels within a 5G/NR subframe. The 5G/NR frame structure may be, for a particular set of subcarriers (carrier system bandwidth), FDD in which subframes within the set of subcarriers are dedicated to DL or UL, or subcarriers (carrier system bandwidth). ), the subframes within the set of subcarriers may be TDD dedicated to both DL and UL. In the examples provided by FIGS. 2A and 2C , it is assumed that the 5G/NR frame structure is TDD, and subframe 4 is configured with slot format 28 (mainly for DL) (where D is DL, U is UL and , X is flexible for use between DL/UL), subframe 3 consists of slot format 34 (mainly in the case of UL). Although subframes 3 and 4 are shown in slot formats 34 and 28, respectively, any particular subframe may be configured in any of a variety of available slot formats 0-61. Both slot formats 0 and 1 are DL and UL, respectively. Other slot formats 2-61 include a mix of DL, UL and flexible symbols. UEs are configured in a slot format (dynamically via DL control information (DCI) or semi-statically/statically via radio resource control (RRC) signaling) via a received slot format indicator (SFI). It is noted that the description below also applies to the 5G/NR frame structure which is TDD.

와 동일할 수 있으며, 여기서 μ는 뉴머롤로지 0 내지 5이다. 이로써, 뉴머롤로지 μ=0은 15 kHz의 서브캐리어 간격을 갖고, 뉴머롤로지 μ=5는 480 kHz의 서브캐리어 간격을 갖는다. 심볼 길이/듀레이션은 서브캐리어 간격과 반비례 관계이다. 도 2a-도 2d는 슬롯당 14개의 심볼들을 갖는 슬롯 구성 0 및 서브프레임당 1개의 슬롯을 갖는 뉴머롤로지 μ=0의 예를 제공한다. 서브캐리어 간격은 15 kHz이고, 심볼 듀레이션은 대략 66.7 μs이다.Different wireless communication technologies may have different frame structures and/or different channels. A frame (10 ms) may be divided into 10 subframes (1 ms) of the same size. Each subframe may include one or more time slots. Subframes may also contain mini-slots, which may contain 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. The symbols on the DL may be CP-OFDM (cyclic prefix (CP) OFDM) symbols. The symbols on the UL are CP-OFDM symbols (for high throughput scenarios) or DFT-s-OFDM (discrete Fourier transform (DFT) spread OFDM) symbols (single carrier frequency-division multiple access (SC-FDMA) symbols). also referred to) (for power limited scenarios; limited to single stream transmission). The number of slots in a subframe is based on slot configuration and numerology. For slot configuration 0, different numerologies μ 0-5 allow 1, 2, 4, 8, 16 and 32 slots per subframe, respectively. For slot configuration 1, different numerologies 0 to 2 allow 2, 4 and 8 slots per subframe respectively. Thus, for slot configuration 0 and numerology μ, there are 14 symbols/slot and 2 μ slots/subframe. Subcarrier spacing and symbol length/duration are functions of numerology. The subcarrier spacing is

may be the same as , where μ is numerology 0 to 5. Thus, the pneumology μ=0 has a subcarrier spacing of 15 kHz, and the pneumology μ=5 has a subcarrier spacing of 480 kHz. The symbol length/duration is inversely proportional to the subcarrier spacing. Figures 2a-2d provide an example of a slot configuration 0 with 14 symbols per slot and a numerology μ=0 with 1 slot per subframe. The subcarrier spacing is 15 kHz, and the symbol duration is approximately 66.7 μs.

[0059] A resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RB (PRB)) that extends 12 consecutive subcarriers. The resource grid is divided into a plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0060] As illustrated in FIG. 2A , some of the REs carry reference (pilot) signals (RS) for the UE. RS is denoted as Rx for channel state information reference signals (CSI-RS) and demodulation RS (DM-RS) (for one specific configuration) for channel estimation at the UE, where 100x is a port number but other DM-RS configurations are possible) may be included. RS may also include beam measurement RS (BRS), beam refinement RS (BRRS) and phase tracking RS (PT-RS).

[0061] 2B illustrates an example of various DL channels within a subframe of a frame. A physical downlink control channel (PDCCH) carries DCI in one or more control channel elements (CCEs), each CCE includes 9 RE groups (REGs), and each REG is 4 consecutive REs in an OFDM symbol include those A primary synchronization signal (PSS) may be in symbol 2 of specific subframes of a frame. The PSS is used by the UE 104 to determine subframe/symbol timing and physical layer identity. A secondary synchronization signal (SSS) may be in symbol 4 of specific subframes of the frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE may determine a physical cell identifier (PCI). Based on the PCI, the UE may determine the locations of the DM-RS described above. A physical broadcast channel (PBCH) carrying a master information block (MIB) may be logically grouped with a PSS and an SSS to form a synchronization signal (SS)/PBCH block. The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). A physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted over the PBCH such as system information blocks (SIBs), and paging messages.

[0062] As illustrated in FIG. 2C , some of the REs carry DM-RS (denoted as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE may transmit a DM-RS for a physical uplink control channel (PUCCH) and a DM-RS for a physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is transmitted and depending on the particular PUCCH format used. Although not shown, the UE may transmit sounding reference signals (SRS). The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling for the UL.

[0063] 2D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and uplink control information (UCI) such as HARQ ACK/NACK feedback. The PUSCH carries data and may be used to additionally carry a buffer status report (BSR), a power headroom report (PHR), and/or a UCI.

[0064] 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from EPC 160 may be provided to controller/processor 375 . The controller/processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, layer 2 is a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer includes The controller/processor 375 is configured to perform broadcasting of system information (eg, MIB, SIBs), RRC connection control (eg, RRC connection paging, RRC connection establishment, RRC connection modification and RRC connection release), radio access technology (RAT) ) RRC layer functionality associated with measurement configuration for inter-mobility and UE measurement reporting; PDCP layer functionality associated with header compression/decompression, security (encryption, decryption, integrity protection, integrity verification) and handover support functions; Delivery of higher layer packet data units (PDUs), error correction through ARQ, concatenation of RLC service data units (SDUs), segmentation and reassembly, re-segmentation of RLC data PDUs and reordering of RLC data PDUs RLC layer functionality associated with; and mapping between logical channels and transport channels, multiplexing of MAC SDUs into transport blocks (TBs), demultiplexing of MAC SDUs from TBs, reporting scheduling information, error correction via HARQ, priority handling and logical channel priority Provides MAC layer functionality related to ranking.

[0065] A transmit (TX) processor 316 and a receive (RX) processor 370 implement Layer 1 functionality associated with various signal processing functions. Layer 1, including the physical (PHY) layer, includes error detection on transport channels, forward error correction (FEC) coding/decoding of transport channels, interleaving, rate matching, mapping to physical channels, and modulation/demodulation of physical channels. , and MIMO antenna processing. The TX processor 316 uses various modulation schemes (eg, binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature (M-QAM)). amplitude modulation)) and handles mapping to signal constellations based on the The coded and modulated symbols can then be split into parallel streams. Each stream is then mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an Inverse Fast Fourier Transform (IFFT), in time A physical channel carrying a domain OFDM symbol stream may be created. An OFDM stream is spatially precoded to produce multiple spatial streams. Channel estimates from channel estimator 374 may be used for spatial processing, as well as to determine a coding and modulation scheme. The channel estimate may be inferred from a reference signal transmitted by the UE 350 and/or channel state feedback. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a respective spatial stream for transmission.

[0066] At the UE 350 , each receiver 354RX receives a signal via its respective antenna 352 . Each receiver 354RX recovers information modulated on the RF carrier and provides this information to a receive (RX) processor 356 . TX processor 368 and RX processor 356 implement Layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350 . When multiple spatial streams are destined for a UE 350 , they may be combined by the RX processor 356 into a single OFDM symbol stream. Then, the RX processor 356 transforms the OFDM symbol stream from the time domain to the frequency domain using a Fast Fourier Transform (FFT). The frequency domain signal includes a separate stream of OFDM symbols for each subcarrier of the OFDM signal. The symbols and reference signal on each subcarrier are recovered and demodulated by determining the most probable signal constellation points transmitted by the base station 310 . These soft decisions may be based on channel estimates computed by channel estimator 358 . The soft decisions are then decoded and deinterleaved to recover the data and control signals that were originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to a controller/processor 359, which implements the layer 3 and layer 2 functionality.

[0067] A controller/processor 359 may be associated with a memory 360 that stores program codes and data. Memory 360 may be referred to as a computer-readable medium. In the UL, controller/processor 359 provides control signal processing for demultiplexing between transport and logical channels, packet reassembly, de-encryption, header decompression, and recovering IP packets from EPC 160 . . The controller/processor 359 is also responsible for error detection using the ACK and/or NACK protocol to support HARQ operations.

[0068] Similar to the functionality described with respect to DL transmission by base station 310 , controller/processor 359 may include: RRC layer functionality associated with system information (eg, MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery of higher layer PDUs, error correction via ARQ, concatenation, segmentation and reassembly of RLC SDUs, re-segmentation of RLC data PDUs and reordering of RLC data PDUs; and mapping between logical channels and transport channels, multiplexing of MAC SDUs to TBs, demultiplexing MAC SDUs from TBs, reporting scheduling information, error correction via HARQ, priority handling and logical channel prioritization. Provides MAC layer functionality.

[0069] Channel estimates inferred by channel estimator 358 from the reference signal or feedback transmitted by base station 310 may be used by TX processor 368 to select appropriate coding and modulation schemes and to enable spatial processing. there is. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

[0070] The UL transmission is processed at the base station 310 in a manner similar to that described with respect to receiver functionality at the UE 350 . Each receiver 318RX receives a signal via its respective antenna 320 . Each receiver 318RX recovers information modulated on the RF carrier and provides this information to an RX processor 370 .

[0071] A controller/processor 375 may be associated with a memory 376 that stores program codes and data. Memory 376 may be referred to as a computer-readable medium. In the UL, a controller/processor 375 provides control signal processing for demultiplexing between transport and logical channels, packet reassembly, de-encryption, header decompression, and recovering IP packets from the UE 350 . IP packets from the controller/processor 375 may be provided to the EPC 160 . The controller/processor 375 is also responsible for error detection using the ACK and/or NACK protocol to support HARQ operations.

[0072] At least one of TX processor 316 , RX processor 370 , and controller/processor 375 may be configured to perform aspects with respect to techniques for determining reference signals for CW update, as shown in FIG. 1 . a contention window component 198 . Similarly, at least one of TX processor 368 , RX processor 356 , and controller/processor 359 may be configured to perform aspects with respect to techniques for determining reference signals for CW update, contention window component 199 of FIG. 1 .

[0073] Spectrum sharing provides access to shared and unlicensed spectrum that offers the advantages of higher capacity, higher spectrum utilization, and new deployments. These deployments include licensed spectrum aggregation to enable enhanced mobile broadband with higher speeds and better user experiences; private networks that provide enterprise services such as industrial IoT applications; or enhanced local broadband enabling host networks such as sports and entertainment venues. For example, LAA uses licensed and unlicensed spectrum together to create higher capacity than can be provided by licensed spectrum alone.

[0074] Prior to obtaining access to the contention-based shared radio frequency spectrum band and communicating through it, a base station or UE may perform a listen before talk (LBT) procedure to contend for access to the shared radio frequency spectrum band. there is. The LBT procedure may include performing a CCA procedure to determine whether a channel in the contention-based shared radio frequency spectrum band is available. When it is determined that a channel in the contention-based shared radio frequency spectrum band is available, the wireless device may transmit a channel reserve signal, such as a channel usage beacon signal (CUBS), to reserve the channel. The CCA procedure used by the wireless device to check a particular channel before using it may be based on energy detection. The wireless device may perform energy detection to detect the presence or absence of other signals on the channel to determine whether the channel is occupied or clear. A duration for performing CCA may be based on a CW size, a random backoff, an energy detection threshold, and the like. For LAA, the wireless device may use the LBT procedure. LBT (which may also be known as listen before transmit) is a technique used by a transmitter to first sense the radio environment before starting to transmit. Wireless devices use a contention window (CW) to enable Cat. 4 may initiate an LBT procedure, such as an LBT procedure. CW may be a positive integer indicating the length of time for the UE to detect the radio environment. A longer CW may result in a higher backoff by the wireless device. The CW may be adjusted based on network conditions. When the network is congested, the transmitting device does not receive NACKs or any acknowledgments in response to the transmission. In response to receiving negative feedback or not receiving feedback, the device may increase the CW, such as by doubling the CW size, multiplying by a factor, or adding an offset. can If the network is less congested, the device may decrease the CW (eg, reset to a minimum value), as indicated by the transmitting device receiving the ACK.

[0075] Accordingly, some aspects of updating a CW of a transmitting device may be based on the success or failure of a reference transmission received by the receiving device. The transmitting device may identify the reference transmission as a transmission signal transmitted during the reference slot of the COT. For example, the reference slot may be the first valid slot of the COT. Since Wi-Fi devices can transmit request to send (RTS)/clear to send (CTS) and stop, utilization of the early part of the COT to determine CW updates provides a more accurate LBT procedure can do. The reference slot may be, for example, a first slot in the COT or a first partial slot (in the case of punctured transmission) and a subsequent slot in the COT. The CW may be adjusted based at least in part on the first slot in the COT or, in the case of punctured transmissions, the partial slot and subsequent slot in the COT.

[0076] However, the slot size may be different based on different subcarrier spacing (SCS). For 15 kHz SCS, the slot has a duration of 1 ms. For 30 kHz SCS, the slot has a duration of 0.5 ms. For example, in NR-U communication, different SCSs may be used for communication. Also, for a given SCS, the duration of the downlink transmissions may be different (eg, the durations of the PDSCH transmissions may be different, and some PDSCHs may span only a few symbols of a slot). Some techniques described below take these considerations into account when determining RD and reference transmissions for use in CW coordination.

[0077] Moreover, even when the PDSCH transmission is punctured, Code Block Group (CBG) based feedback may be available. Some techniques described below use CBG-based feedback to allow the reference duration to include less than a full slot following a partial slot.

[0078] CW size adjustment techniques for UE and base station

[0079] 4 illustrates a call flow 400 using CW size adjustment techniques (eg, 412 , 418 , 422 , and 428 ) in accordance with some implementations. The UE 402 may adjust or update its CW size or value using CW size adjustment techniques (eg, 412 and 418 ). At 410 , the UE 402 sends one or more uplink transmissions at a transmission opportunity (TxOp) to the base station 404 . The uplink transmissions may be, for example, PUCCH or PUSCH transmissions. At block 412 , the UE 402 determines at least one uplink reference transmission either directly or based on the determined RD. At block 418 , the UE 402 updates or adjusts its CW size based on one or more ACK/NACK feedbacks of the reference transmission sent by the base station 404 and received by the UE 402 at 414 . .

[0080] Similarly, base station 404 may adjust or update its CW size or value using CW size adjustment techniques (eg, 422 and 428 ). At 420 , the base station 404 may send one or more downlink transmissions in TxOp to the UE 402 . The downlink transmissions may be, for example, PDCCH or PDSCH transmissions. At block 422 , the base station 404 determines at least one downlink reference transmission either directly or based on the determined RD. At block 428 , the base station 404 updates or adjusts its CW size based on one or more ACK/NACK feedbacks of the reference transmission sent by the UE 402 and received by the base station 404 at 424 . .

[0081] 5 illustrates various techniques 500 for determining RD, reference transmissions, and CW size in accordance with some implementations. The RD determination component 504 can include an SCS dependent RD generator 508 that generates an RD 506 that is dependent on the SCS. The SCS dependent RD generator 508 may also include slot-based RD determination techniques 514 and symbol-based RD determination techniques 518 . Slot-based RD determination techniques 514 are described in more detail below with reference to FIG. 6A , and symbol-based RD determination techniques 518 are described in more detail below with reference to FIG. 6B .

[0082] The RD determining component 504 also includes puncturing handling techniques 516 for selectively extending the RD when one or more transmissions are punctured, and selectively determining the RD when the one or more transmissions are punctured in time and frequency. subband puncturing handling techniques 518 to extend. Puncture handling techniques 516 are described in greater detail below with reference to FIGS. 8A-8B . Subband puncturing handling techniques 518 are described in greater detail below with reference to FIGS. 9A-9B .

[0083] Slot-Based Reference Duration

[0084] Referring to FIG. 6A , one or more slot-based RD techniques 514 may be utilized to generate an RD 506 based on a number of slots (eg, RD with a duration in units of slots). In one example, RD 506 may be based on a minimum SCS supported. As an example, the RD may be predefined based on the minimum SCS supported (eg, an RD of 1 ms may be used if the minimum SCS supported is 15 kHz). The RD may be based on the minimum SCS supported by the transmitting device. For example, if the base station supports a minimum SCS of 15 kHz, the base station may use an RD of 1 ms. If the base station supports a minimum SCS of 30 kHz, the base station may use an RD of 0.5 ms. If the base station supports a minimum SCS of 60 kHz, the base station may use an RD of 0.25 ms. If the base station supports a minimum SCS of 120 kHz, the base station may use an RD of 0.125 ms. If the base station supports a minimum SCS of 240 kHz, the base station may use an RD of 0.0625 ms. 6A illustrates an example slot size 604 and two different RDs 610 and 614 based on different reference SCS sizes. 6B also illustrates an example symbol size 644 and size of RD 640 with duration based on a reference SCS. In Figure 6a, the duration of RD is based on the slot size, eg the number of slots. In FIG. 6B , the duration of an RB has duration-based symbol units, eg, one or more symbols in length. Thus, in FIG. 6A , RD may have a size of a certain number of slots, and in FIG. 6B , RD may have a size of a certain number of symbols. Although aspects are described using the example of a base station, this is merely illustrative of the concept. Aspects may similarly be applied by the UE.

[0085] In a second example, RD 506 may be determined as a function of the minimum SCS (eg, 510 ) actually used at the beginning of the COT. For example, if the base station uses a 15 kHz SCS for transmission at the start of the COT, the base station may use an RD of 1 ms. Otherwise, if the base station uses 30 kHz SCS, the base station may use RD 506 of 0.5 ms. Alternatively, the RD may be based on the maximum SCS used by the transmitting device at the beginning of the COT (eg, at 511 ). For example, if the base station uses a maximum SCS of 30 kHz, the base station may use an RD of 0.5 ms or the like.

[0086] Since the RD may be different for different SCS, for CW adjustments, the PDSCH of a particular SCS is considered to be within the duration corresponding to that SCS without considering the PDSCH of the different SCS. RD determining component 520 can use any of various techniques 512 to determine different reference durations for each SCS. For example, techniques 512 may be utilized to determine SCS-specific distinct RDs such that PDSCHs of a particular SCS may be included within a duration corresponding to that SCS. For example, all 15 kHz PDSCHs transmitted during the first 1 ms of COT and all 30 kHz PDSCHs transmitted during the first 0.5 ms of COT may be considered for CW update.

[0087] In one example, the RD may be based on a maximum of RD values determined by using any of the techniques described above. In another example, a lower bound (eg, a minimum RD value) may be applied to the result of the maximum function such that RD is not less than a predetermined value. For example, the lower limit may be a duration of 0.5 ms or some other predetermined value.

[0088] Symbol-based RD

[0089] Although aspects are described using the example of a base station, this is merely illustrative of the concept. Aspects may similarly be applied by the UE. When the PDSCHs transmitted in the first slot do not occupy all the symbols, the base station may determine the RD based on the partial slot, eg, based on the symbols. Such scheduling may also be referred to herein as subslot scheduling. For example, the RD may extend from the start of the first slot to the symbol of the PDSCH that ends at the earliest. For example, three PDSCHs, a first PDSCH of S1-S3 (S=symbol), another PDSCH of S4-S13, and another PDSCH of S1-S13 will be considered. In this case, the base station may determine that the RD is S1-S3 because the first PDSCH is terminated earliest in the first slot.

[0090] In another example, the first slot may have one PDSCH of S1 to S13 and another PDSCH of S7-S8. According to the first example, the base station may determine the RD based on the earliest ending PDSCH without considering the position where the PDSCH starts in the COT. Accordingly, the base station may decide to extend RD from S1 to S8.

[0091] According to the second example, the base station may determine the RD based on the earliest ending PDSCH and also considering whether it has PDSCHs that start early in TxOP or PDCCHs that start early in TxOP. The term “early” may be defined as beginning within the first X symbols or X ms of the COT. X may correspond to an integer value such that X symbols correspond to the number of symbols. In this case, using the same example as above, the base station may determine that the RDs are S1 to S13, because the PDSCHs of S1 to S13 start early in the COT. When a PDSCH is transmitted together with a plurality of SCSs, since RD determination techniques can be independently applied for each SCS, some PDSCHs exist for each SCS. RD may be determined based on a maximum or minimum of RD determined across all SCSs. RD may be determined and applied for each SCS. Thus, for multiple SCSs, the base station may determine and apply multiple RDs.

[0092] The RD determination techniques described above can also be applied at the CBG level when CBG based feedback/transmission is used. Accordingly, the RD may be based on the first CBG of the PDSCH ending early or based on the first CBG of the PDSCH starting early in the TxOP. If there are two PDSCHs such that the first CBG of the first PDSCH occurs in slots S1-S2 and the first CBG of the second PDSCH occurs in slots S1-S4, the first CBG of the first PDSCH is the earliest Since it ends at , the duration may be determined by slots S1-S2. The RD may be based on the first CBG of the PDSCH starting within a specific time period with reference to the start of the COT. When multiple CBGs are transmitted together with multiple SCSs, the RD may be determined for each SCS or may be determined independently from the SCS. Thus, the first CBG of PDSCHs may be used for each SCS. The duration may be determined based on a maximum of REs determined using different techniques or based on a minimum of RDs determined using different techniques.

[0093] Accordingly, the base station may determine the RD based on the maximum value of the RDs determined with any of the techniques described herein. In another example, the determined value may have a lower bound such that RD may not be less than a predetermined minimum value, such as 0.25 ms.

[0094] Reference transmission determining component 520 can apply any of a variety of techniques to determine reference transmission 524 . Component 520 can determine the reference transmission, eg, based on RD. In one example, component 520 can determine which PDSCH(s) to use as reference PDSCH(s) for determining CW update.

[0095] The base station may identify the reference PDSCH(s) as PDSCH transmission(s) starting within the RD identified at the beginning of the COT. The base station may identify the reference PDSCH(s) as PDSCH transmission(s) ending within the RD identified at the beginning of the COT. The base station may identify the reference transmission based on CBGs that are within or at least partially overlap with the RD. The base station may identify the reference PDSCH(s) as all PDSCH transmissions for which the PDCCH was transmitted in the RD. 7A illustrates an example in which any PDSCH transmissions starting within the RD identified at the start of the COT may be considered for CW update, eg, may be used as a reference PDSCH transmission. Both PDSCH-1 and PDSCH-2 are used as reference PDSCH transmissions since both transmissions start in RD. 7B illustrates an example in which PDSCH transmissions that end within an RD identified at the start of COT may be used as reference PDSCH transmissions. PDSCH-1 is used as a reference PDSCH, but PDSCH-2 is not considered a reference PDSCH because PDSCH-2 is not terminated in RD. 7C illustrates an example in which PDSCH CBGs overlapping within/with RD may be used as reference transmissions. PDSCH-1 may be entirely used as a reference PDSCH, while CBGs of PDSCH-2 in RD may be used as reference CBGs for determining CW update.

[0096] Component 520 can also directly determine the reference transmission, eg, based on 526 , without first determining RD as at 528 . For example, the base station may determine, based on the PDCCHs corresponding to the PDSCHs, that one or more PDSCH transmissions are the reference PDSCH. PDSCHs in which PDCCHs are transmitted within a predetermined time (eg, first X ms of first slot) or predetermined number of symbols (eg, first X symbols of first slot of COT) are used as reference PDSCHs, and CW update can be considered for The application of this technique to an example is further illustrated with reference to FIG. 10 . The CW adjustment component 534 receives the reference transmission 524 , the explicit feedback 536 , and/or the implicit feedback 538 , and based on this, determines whether to adjust the CW size 542 for future LBT processes. decide The LBT process may include, for example, a Cat-4 LBT process. Explicit feedback 536 and/or implicit feedback 538 may relate to whether the determined reference transmission was successfully received by the receiving node.

[0097] Determining the reference duration when the reference transmission is punctured

[0098] Although aspects are described using the example of a base station, this is merely illustrative of the concept. Aspects may similarly be applied by the UE. As an example, when PDSCH puncturing is performed at the start of COT, the base station may need to include additional slots in the RD so that additional PDSCH transmissions can be considered. According to a first example, the base station may determine not to include additional slots or PDSCH when CBG based feedback is available for at least one unpunctured CBG. 8A illustrates a case in which both PDSCH-1 and PDSCH-2 are punctured. PDSCH-1 does not have any unpunctured CBGs, whereas PDSCH-2 has at least one unpunctured CBG. In this case, the CW update may be determined using the RD without considering any other PDSCHs and/or additional slots.

[0099] When CBG-based feedback is not available, the base station may include additional slot(s) or PDSCH(s) or CBG(s) in determining CW update. 8B illustrates a case where additional PDSCH-3 is considered for RD determination because PDSCH-1 does not provide any CBG feedback. The additional PDSCH may be a full PDSCH or a partial PDSCH (eg, the first CBG of the additional PDSCH). According to a second example, for reference transmission or when puncturing occurs during RD, the base station, regardless of whether CBG feedback is available, extends the RD and/or sends additional transmissions (eg, additional PDSCHs or additional slots) can be considered.

[00100] In some implementations, the base station can determine the RD and/or reference transmission based on whether the PDSCH is broadcast without feedback. For example, the base station may determine the RD and/or determine the reference transmission(s) without considering the broadcast PDSCH (eg, system information or paging) without ACK/NACK feedback. The base station may consider subsequent slots with PDSCH transmissions with ACK/NACK feedback available. When the first slot of the COT includes, for example, a broadcast PDSCH without a unicast PDSCH, the base station may extend the RD to include PDSCHs transmitted in a subsequent slot. When the first slot of the COT includes both the broadcast PDSCH and the unicast PDSCH, the base station may, for example, consider the unicast PDSCH for determining the RD, and may ignore the broadcast PDSCH when determining the RD. In one example, the base station may use message 2 (MSG2) or a random access procedure as the reference transmission. For example, the base station may consider whether message 3 (MSG3) is received from the UE in response to the MSG2 transmission from the base station. MSG2 may include, for example, a random access response (RAR) transmitted from the base station to the UE in response to the first random access message from the UE. The first random access message from the UE may include, for example, a random access preamble to initiate a random access procedure. Accordingly, MSG3 from the UE may be considered to correspond to positive feedback (eg, similar to ACK) from the UE in response to the MSG2 random access message. Therefore, when MSG3 is considered for CW update, MSG2 PDSCH/PDCCH may be used to determine the RD or reference PDSCH. In one example, when the communication between the base station and the UE includes contention-free random access, MSG3 may be considered for CW update.

[00101] Determination of Reference Duration with Subband Punctured Reference Transmission

[00102] Although aspects are described using the example of a base station, this is merely illustrative of the concept. Aspects may similarly be applied by the UE. For example, when the first slot is partially punctured in time, the reference slot may be determined based on the partial slot and the next full slot (when the next full slot is transmitted in the same TxOP). In some communications, puncturing may occur in both the time domain and the frequency domain. For example, NR-U may have carriers with multiple LBT subbands as opposed to eg LTE. Thus, in NR-U, puncturing may occur on some subbands and not on other subbands. For example, the base station may prepare the PDSCH to span three subbands (eg, SB1, SB2, SB3), and subbands SB1 and SB3 may pass through the LBT while SB2 may not. Then, the base station punctures a part of the PDSCH in SB2 and transmits in SB1 and SB3. Accordingly, CW updates for SB1 and SB3 based on ACK/NACK for this punctured PDSCH in SB2 may be pessimistic.

[00103] Due to the processing timeline, frequency puncturing may also span more than one slot in the time domain. Unlike time domain puncturing, where there may be a single partial slot, in frequency domain puncturing there may be more than one partial slot (eg, multiple partial slots). There may also be cases where the partial slot contains an unpunctured PDSCH (or CBG of a punctured PDSCH). For example, some PDSCHs may be limited to SB1 or SB3, while other PDSCHs may span multiple subbands.

[00104] Some CBGs are not punctured, and CBG level feedback is available at the base station

[00105] According to some aspects, when there is at least one PDSCH that is not punctured (or CBG for which feedback is available), the base station may determine the RD 506 based at least in part on the partial slot without additional slots. 9A illustrates an example in which partial slots may be used as RD 506 . As shown, PDSCH-1 is punctured, but PDSCH-6 is not punctured, and RD may be based on the first slot. In some implementations, the base station may not consider punctured PDSCH or punctured CBGs when determining CW coordination.

[00106] According to some aspects, when there is at least one PDSCH punctured, the base station selects the RD 506 based at least in part on the partial slot and the next N slots until an end of a transmission opportunity (TxOP) is reached. can be determined, where N is an integer. Accordingly, the N slots may represent the number N of slots after the partial slot. 9B illustrates this case in which the RD contains additional slots other than those containing PDSCH-1, PDSCH-2, and PDSCH-3, since each of these PDSCHs is punctured in subband 2. The base station may extend the RD to include additional slots until the RD includes a slot in which the PDSCHs are not punctured. For example, in FIG. 9B , slots are added to partial slots until PDSCH-4 and PDSCH-5 reach an unpunctured slot, which means that these specific PDSCH transmissions are sent on subbands 1 and 3, respectively, so that the LBT This is because subband 2, which has failed, is avoided. In one example, N may be a fixed number. The number of slots to consider after a partial slot for CW coordination may also be a function of SCS. For example, in the case of SCS of 15 kHz or 30 kHz, the base station may include one additional slot. For SCS of 60 kHz, the SCS base station may include more than one additional slot, eg, two additional slots.

[00107] In a second example, the duration, eg, number N of slots, may be dynamic or variable. For example, additional slots after a partial slot may be considered until an unpunctured slot is determined or the end of the TxOP is reached.

[00108] In one implementation, an unpunctured slot may be a slot in which all PDSCHs are not punctured, eg, a slot in which there is no punctured PDSCH. In a second implementation, the unpunctured slot may be a slot in which at least one PDSCH is not punctured. In a third implementation, the unpunctured slot may be a slot in which at least one PDSCH CBG is not punctured.

[00109] When there are multiple partial slots with punctured PDSCH and full non-punctured slots, the base station may determine the RD 506 based on the non-punctured full slot and all partial slots. Alternatively, when there are multiple partial slots with punctured PDSCH and a full unpunctured slot, the base station may determine the RD 506 based on the unpunctured full slot and one partial slot. . The partial slot may be selected as the first partial slot of the COT or the partial slot before or immediately before the full unpunctured slot.

[00110] In certain aspects, the base station may maintain a separate CW for each LBT subband. When the PDSCH is punctured in some subbands, but transmitted on other subbands, the base station can independently determine the RD 506 or reference transmission (eg, reference PDSCH) 524 for each subband. . For each subband, the base station may determine the reference PDSCH as the entire PDSCH (eg, unpunctured PDSCH) or one or more CBGs of the unpunctured PDSCH(s). When the PDSCH is punctured in some subbands, but transmitted on other subbands, the base station may determine an RD 506 that is common across multiple subbands. For example, the base station may continue to increase the RD 506 until each subband has a CBG of at least one PDSCH or unpunctured PDSCH.

[00111] CW update or adjustment for UL-centric TxOP

[00112] Some of the techniques for CW update described above may be applied to TxOP including at least one DL transmission. 12 , the base station may update the CW based at least in part on the downlink transmission during the RD. However, there are situations where the TxOP does not include any DL transmissions referred to as UL centric TxOP. Techniques for handling CW update for UL centric TxOPs are now described.

[00113] In one example, the base station may determine the CW update using the success or failure of PUSCHs on which PDCCHs are transmitted within the reference slot of the COT. If the TxOP includes UL grants, the base station determines the RD using the techniques described above with reference to FIGS. 5, 6A, and 6B , and also determines which reference transmissions (eg, reference PUSCH) for CW update. ) can be considered.

[00114] The base station may determine the RD based on units of slots using the techniques described above with reference to FIGS. 5 and 6A . Instead of considering the SCS of the PDSCH, the base station may consider the SCS of the PDCCHs scheduling PUSCH transmissions. For techniques 509-511, the base station determines the minimum SCS actually used by the base station to transmit the PDCCH at the start of the COT, or the RD as a function of the minimum SCS for the PDCCH supported by the base station, e.g. can decide

[00115] The base station may determine the RD based on the subslot scheduling techniques described above. For example, the techniques 515 for determining the symbol-based RD may be equally applied herein. Instead of determining which PDSCH terminates earliest, the subslot scheduling scheme may determine the RD based on which PDCCH terminates earliest.

[00116] In another example, the base station may determine the RD and/or reference transmission based on the PDCCH. For example, the base station transmits PUSCH transmissions in which the PDCCH is transmitted within a first predetermined time from the start of the COT (eg, X ms) or within a predetermined number of symbols (eg, X symbols) within a first slot of the COT. RD can be determined based on . 10 illustrates an example 1000 of a predetermined time/number of symbols 1014 within a first slot 1016 of a COT. In one example, the base station may directly determine the reference PUSCH, eg, rather than determining the reference duration.

[00117] The base station may determine the reference PUSCH by including each PUSCH transmission in which the PDCCH is transmitted in the RD. Any of the previously described techniques for determining the reference transmission may also be applied in combination to determine the reference PUSCH based on the determined RD or other factor or to directly determine the reference PUSCH.

[00118] 13 illustrates an example method for a base station to determine at least one PDCCH transmission transmitted during an RD. The base station updates the CW based at least in part on the uplink transmission with the PDCCH transmission transmitted during the RD.

[00119] TxOP with both DL and UL

[00120] According to an example, the base station may schedule DL and UL transmissions in TxOP, and the base station may perform CW update based on ACK/NACK feedback for DL transmissions while ignoring success or failure of UL transmissions. Application of this technique may be based on the initiation of a COT comprising at least one DL transmission.

[00121] Due to broadcast transmissions, it is possible that the start of the COT may not include any DL transmissions with corresponding ACK/NACK feedback, eg, in NR-U. Accordingly, in certain aspects, UL transmissions and/or DL transmissions may be used to update the CW size when the COT includes both UL and DL transmissions. For example, the base station may consider ACK/NACK feedback for DL transmissions when the early portion of the COT includes DL transmissions that may be used for CW update. Otherwise, the base station may determine its CW update based on UL transmissions while ignoring DL transmissions. According to the second technique, the base station may consider both ACK/NACK feedback of DL transmissions and success/failure of UL transmissions to update or adjust the CW size.

[00122] 14 illustrates an example method of CW adjustment or update in which a base station determines whether to use a reference PDSCH transmission or a reference PUSCH transmission to update a CW size. When the PDSCH is transmitted for a period of time from the start of the COT with associated feedback, the base station may decide to use the PDSCH transmission instead of the PUSCH transmission to update the CW. When the PDSCH with associated feedback is not transmitted for a period of time from the start of the COT, the base station may decide to use the PUSCH transmission instead of the PDSCH transmission to update the CW. In another example, a base station may use both a PDSCH transmission and a PUSCH transmission to update its CW.

[00123] 12 is a flowchart 1200 of a wireless communication method. In one example, the method may include a base station or components of a base station (eg, base station 102 , 180 , 310 , apparatus 1602 , 1602 ′), memory 376 , and may include the entire base station 310 or base station 310 . ), such as processing system 1714 , which may be TX processor 316 , RX processor 370 , and/or controller/processor 375 . In another example, a method may include a UE or a component of a UE (eg, UE 104 , 350 , apparatus 1602 , 1602 ′; memory 360 , and may include the entire UE 350 or UE 350 ). component, such as processing system 1714 , which may be TX processor 368 , RX processor 356 , and/or controller/processor 359 . Optional aspects are illustrated using dashed lines.

[00124] At 1202 , the device determines an RD of the COT, the RD being based at least in part on the SCS and based on receiving a physical downlink shared channel (PDSCH) transmission. The determination may be performed, for example, by reference duration determining component 1612 of apparatus 1602 . Examples of such an RD determination are described, for example, with respect to FIGS. 6A and 6B . The reference duration may be determined based on the minimum SCS supported by the base station. The reference duration may be determined based on the minimum SCS used by the device at the start of the COT. The wireless device may determine a first reference duration for the first SCS and a second reference duration for the second SCS, wherein the device transmits a first shared channel based on the first SCS for a first duration, and a second reference duration for a second duration. 2 Update the CW based on the second downlink transmission based on the SCS. When the method is performed by a base station, the shared channel transmission may include a PDSCH. When the method is performed by the UE, the shared channel transmission may include a PUSCH. The reference duration may be determined based on a maximum of a predefined minimum duration, a minimum SCS supported by the device, or a minimum SCS used by the device at the start of the COT.

[00125] The reference duration of the COT may be determined, for example, based on the number of slots as described with respect to FIG. 6A . The reference duration of the COT may be determined based on the number of symbols, eg, as described with respect to FIG. 6B .

[00126] The COT may include a first slot having a plurality of symbols, and a reference duration of the COT may be determined based on the number of symbols of the PDSCH transmission transmitted during the first slot of the COT. As an example, the reference duration may be determined based on the PDSCH transmission with the earliest termination symbol in the first slot of the COT. The reference duration may be determined based on the PDSCH transmission with the earliest start symbol in the first slot of the COT or the PDSCH transmission with the PDCCH transmitted on the earliest symbol in the first slot of the COT. The reference duration is based on a PDSCH transmission starting within a predetermined time or a predetermined number of symbols from the start of a first slot of the COT or starts within a predetermined number of symbols or a predetermined time from the beginning of a first slot of the COT It may be determined based on the PDSCH having the PDCCH.

[00127] A first reference duration may be determined for a first SCS used in a first slot of the COT, and a second reference duration may be determined for a second SCS used in a first slot of the COT. The reference duration may be determined based on the number of symbols of the first CBG of the PDSCH transmission transmitted during the COT.

[00128] When the puncturing is performed at the beginning of the COT, the reference duration may be determined based on at least one of whether CBG-based feedback is available for at least one non-punctured CBG of the shared channel transmission, where the reference The duration is extended when CBG-based feedback is not available for at least one unpunctured CBG.

[00129] At 1202 , determining the reference duration may include extending the reference duration when the shared channel transmission is punctured during the reference duration.

[00130] A reference duration or a reference PDSCH may be determined based on whether the shared channel transmission includes a broadcast without feedback. The CW may be updated based on the determined reference PDSCH transmission. The reference duration may be extended to include shared channel transmission with feedback. The reference PDSCH may be defined based on the PDSCH that occurs during the reference duration and has feedback.

[00131] The reference duration may be determined further based on whether the at least one unpunctured CBG or the at least one unpunctured PDSCH is transmitted during the reference duration. For example, when no unpunctured CBG is transmitted or no unpunctured PDSCH is transmitted during the reference duration, the reference duration may be extended.

[00132] The reference duration may be determined further based on whether the shared channel transmission is punctured for the reference duration, wherein the reference duration may be extended by the number of slots when the shared channel transmission is punctured for the reference duration. The reference duration may be extended until the end of the shared channel transmission by the base station. The number of slots may include a predetermined number of slots. The number of slots may be based on at least one of an unpunctured slot for a shared channel transmission or an end of a shared channel transmission. The unpunctured slot is at least one of a first slot in which all PDSCH transmissions are not punctured, a second slot in which at least one PDSCH transmission is not punctured, and/or a third slot in which at least one PDSCH CBG is not punctured. may contain one. The reference duration may be extended to include a number of slots containing punctured shared channel transmissions and a slot containing at least one PDSCH transmission or CBG that is not punctured. The plurality of slots may include punctured shared channel transmissions, wherein the reference duration is: a slot including at least one PDSCH transmission or CBG that is not punctured, and a plurality of slots that include unpunctured shared channel transmissions. It may be determined to include at least one of them. The reference duration may be determined for each subband. The reference duration may be commonly determined for a plurality of subbands.

[00133] At 1204 , the device updates the CW based at least in part on reception of the PDSCH transmission during the reference duration. The update may be performed, for example, by the CW coordination component 1616 of the device 1602 . Updating the CW includes doubling the CW based at least in part on a negative acknowledgment received by the device for the shared channel transmission, or at least in part on a positive acknowledgment received by the device for the shared channel transmission. and assigning a predetermined minimum value (CW_min) to the CW based on the CW. Updating the CW may include doubling the CW based at least in part on not receiving any acknowledgment by the device for the shared channel transmission.

[00134] As illustrated at 1203 , the device may also determine the reference PDSCH transmission(s) based on a relationship of a reference duration to a reference PDSCH transmission or a PDCCH transmission for a reference PDSCH transmission. The determination may be performed, for example, by reference transmission determining component 1614 of apparatus 1602 . The CW may be updated based on the determined reference PDSCH transmission, eg, at 1204 . The reference PDSCH transmission(s) may be determined based on a PDCCH transmission associated with at least one reference PDSCH transmission transmitted within a predetermined number of symbols or a predetermined amount of time from the start of the COT. The reference PDSCH transmission(s) may include PDSCH(s) starting within the reference duration of the COT; PDSCH(s) ending within the reference duration of the COT; CBG(s) of PDSCH(s) that at least partially overlap with the reference duration; and/or PDSCH(s) having a PDCCH transmitted within the reference duration.

[00135] As illustrated at 1205 , the device may perform LBT using the updated CW as determined at 1204 , eg, to transmit a shared channel communication to the UE. LBT may be performed, for example, by the receiving component 1604 of the apparatus 1602 . Communication between the device and the UE may be performed on a shared spectrum or an unlicensed spectrum. For example, the communication may be based on NR-U.

[00136] 13 is a flowchart 1300 of a wireless communication method. The method may include a base station or components of a base station (eg, a base station 102 , 180 , 310 , an apparatus 1602 , 1602 ′), a memory 376 , and may include the entire base station 310 or components of the base station 310 ; processing system 1714 , which may be, for example, TX processor 316 , RX processor 370 , and/or controller/processor 375 . Optional aspects are illustrated using dashed lines.

[00137] At 1302 , the base station determines an RD of the COT, the RD being based at least in part on the SCS. RS may be determined, for example, by reference duration determining component 1612 of apparatus 1602 . The reference duration may be determined based on at least one of a predefined minimum duration, a minimum SCS supported by the base station, and/or a minimum SCS used by the base station for the PDCCH at the start of the COT. The reference duration of the COT may be determined based on the number of slots. The reference duration of the COT may be determined based on the number of symbols. The COT may include a first slot having a plurality of symbols, and a reference duration of the COT may be determined based on the number of symbols of the PDCCH transmission transmitted during the COT. The reference duration may be determined based on the reference PDCCH transmission having at least one of an earliest end symbol in a first slot of the COT, and/or an earliest start symbol in a first slot of the COT. The reference duration may be determined based on a reference PDCCH transmission starting within a predetermined number of symbols or a predetermined time from the beginning of the COT.

[00138] The first reference duration may be determined for a first SCS used for the first PDCCH in the COT, and the second reference duration may be determined for a second SCS used for the second PDCCH in the COT.

[00139] The reference duration may be determined for each subband. The reference duration may be commonly determined for a plurality of subbands.

[00140] At 1304 , the base station determines the reference PDCCH transmission(s) to be transmitted during the reference duration. The reference PDCCH transmission(s) may be determined, for example, by the reference transmission determining component 1614 of the apparatus 1602 . An example of the reference transmission(s) determined based on the PDCCH is described with reference to FIG. 10 .

[00141] At 1306 , the base station may update the CW based at least in part on the uplink transmission having at least one reference PDCCH transmission transmitted during the reference duration. The CW may be updated, for example, by the CW coordination component 1616 of the apparatus 1602 . Updating the CW comprises doubling the CW based at least in part on a negative acknowledgment received by the base station for downlink transmission, or at least in part upon a positive acknowledgment received by the base station for downlink transmission. assigning to the CW a predetermined minimum value based on the Updating the CW may include doubling the CW based at least in part on not receiving any acknowledgment by the base station for the downlink transmission. The CW may be updated based on each uplink transmission with a PDCCH transmission transmitted for the reference duration. The CW may be updated based on each uplink transmission with a PDCCH transmission transmitted within a predetermined number of symbols or a predetermined amount of time from the start of the COT.

[00142] As illustrated at 1308 , the base station may perform LBT using the updated CW as determined at 1306 , eg, to transmit a downlink communication to the UE. LBT may be performed, for example, by the receiving component 1604 of the apparatus 1602 . Communication between the base station and the UE may be performed on a shared spectrum or an unlicensed spectrum. For example, the communication may be based on NR-U.

[00143] 14 is a flowchart 1400 of a wireless communication method. The method may include a base station or components of a base station (eg, a base station 102 , 180 , 310 , an apparatus 1602 , 1602 ′), a memory 376 , and may include the entire base station 310 or components of the base station 310 ; processing system 1714 , which may be, for example, TX processor 316 , RX processor 370 , and/or controller/processor 375 . Optional aspects are illustrated using dashed lines.

[00144] As illustrated at 1402, the base station determines the reference duration of the COT. The determination may include, for example, aspects as described with respect to determinations for either 1202 or 1302. The determination may be performed, for example, by reference duration determining component 1612 of apparatus 1602 .

[00145] At 1404 , the base station determines whether to use the reference PDSCH transmission or the reference PUSCH transmission to update the CW. The determination may be performed, for example, by reference transmission determining component 1614 of apparatus 1602 . For example, when the PDSCH is transmitted for a period of time from the start of the COT with associated feedback, the base station may decide to use the PDSCH transmission rather than the PUSCH transmission to update the CW. When the PDSCH with associated feedback is not transmitted for a period of time from the start of the COT, the base station may decide to use the PUSCH transmission instead of the PDSCH transmission to update the CW. The base station may decide to use both the PDSCH transmission and the PUSCH transmission to update the CW.

[00146] At 1406 , the base station updates the CW based on at least one of PDSCH or PUSCH and the reference duration. The CW may be updated, for example, by the CW coordination component 1616 of the apparatus 1602 . Updating the CW comprises doubling the CW based at least in part on a negative acknowledgment received by the base station for downlink transmission, or at least in part upon a positive acknowledgment received by the base station for downlink transmission. assigning to the CW a predetermined minimum value based on the Updating the CW may include doubling the CW based at least in part on not receiving any acknowledgment by the base station for the downlink transmission.

[00147] As illustrated at 1408 , the base station may perform LBT using the updated CW as determined at 1406 , eg, to transmit a downlink communication to the UE. LBT may be performed, for example, by the receiving component 1604 of the apparatus 1602 . Communication between the base station and the UE may be performed on a shared spectrum or an unlicensed spectrum. For example, the communication may be based on NR-U.

[00148] 16 is a conceptual data flow diagram 1600 illustrating data flow between different means/components in an exemplary apparatus 1602 . Apparatus 1602 can be, for example, a base station or component of a base station in communication with a UE, such as device 1650 . In some aspects, an apparatus may include a UE or a component of a UE. The apparatus can include a receiving component 1604 configured to receive a communication from the device 1650 and a transmitting component 1610 configured to transmit the communication to the device. The apparatus may, for example, use the LBT prior to transmitting to the device. Apparatus 1602 may include, for example, an RD determining component 1612 configured to determine an RD duration described in connection with any of 1202 , 1302 , 1402 ; a reference transmission determining component 1614 configured to determine a reference transmission, such as described in connection with any of 1203 , 1304 , 1404 ; and determine whether to update the CW and/or generate the adjusted CW 1617 based on the reference transmission 1615 or RD 1613 as described, eg, in connection with any of 1204 , 1306 , 1406 . and a CW sizing component 1615 . Components 1612 , 1614 , and 1616 perform one or more of the techniques described above with reference to FIGS. 4 , 5 , and 12 .

[00149] Apparatus 1602 may include additional components that perform each of the blocks of the algorithm in the aforementioned flowcharts of FIGS. 4 and 12-14 . As such, each block in the aforementioned flowcharts of FIGS. 4 and 12-14 may be performed by a component, and the apparatus may include one or more of the components. Components may be one or more hardware components specifically configured to perform the described processes/algorithm, may be implemented by a processor configured to perform the described processes/algorithm, or may be a computer-readable medium for implementation by a processor may be stored within, or some combination thereof.

[00150] 17 is a diagram 1700 illustrating an example of a hardware implementation for an apparatus 1602 ′ using a processing system 1714 . Processing system 1704 may be implemented with a bus architecture, represented generally by bus 1724 . Bus 1724 may include any number of interconnecting buses and bridges depending on the particular application of processing system 1714 and overall design constraints. Bus 1724 is one or more processors and/or hardware components represented by processor 1704 , components 1604 , 1606 , 1610 , 1612 , 1614 , 1616 , 1640 , and computer-readable medium/memory 1706 . Links together various circuits containing Bus 1724 may also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described any further.

[00151] The processing system 1714 includes an RD determination component 1612 , a reference transmission determination component 1614 , and a CW size adjustment component 1616 . Components 1612 , 1614 , 1616 perform one or more of the techniques described above with reference to FIGS. 4 , 5 , and 12 .

[00152] The processing system 1714 also includes a TxOP handling component 1640 with UL and DL Tx for performing the techniques described above with respect to FIG. 14 , an uplink for performing the techniques described above with respect to FIG. 13 . a central TxOP handling component 1606 , and a CW coordination component 1616 for performing the techniques described above with respect to FIG. 15 .

[00153] The processing system 1714 can be coupled to the transceiver 1710 . The transceiver 1710 is coupled to one or more antennas 1720 . Transceiver 1710 provides a means for communicating with various other devices over a transmission medium. A transceiver 1710 receives a signal from one or more antennas 1720 , extracts information from the received signal, and provides the extracted information to a processing system 1714 . Transceiver 1710 also receives information from processing system 1714 and generates a signal to be applied to one or more antennas 1720 based on the received information. The processing system 1714 includes a processor 1704 coupled to a computer-readable medium/memory 1706 . The processor 1704 is responsible for general processing, including execution of software stored on the computer readable medium/memory 1706 . The software, when executed by the processor 1704 , causes the processing system 1714 to perform the various functions described above for any particular apparatus. Computer-readable medium/memory 1706 may also be used to store data that is manipulated by processor 1704 when executing software. Processing system 1714 further includes at least one of components 1604 , 1606 , 1610 , 1612 , 1614 , 1616 , 1640 . The components may be software components executing on the processor 1704 , resident/stored in the computer-readable medium/memory 1706 , or may be one or more hardware components coupled to the processor 1704 , or these may be some combination of

[00154] In one configuration, the apparatus 1602 for wireless communication includes means for determining an RD, means for determining a reference transmission, and means for adjusting CW, means for handling UL centric TxOP, and both UL and DL. A base station comprising means for handling TxOP with both, and means for performing LBT based on the updated CW. The aforementioned means may be one or more of the aforementioned components of the apparatus 1602' and/or the processing system 1714 of the apparatus 1602' configured to perform the functions recited by the aforementioned means. As described above, processing system 1714 may include TX processors 316 , 368 , RX processors 356 , 370 , and controller/processors 359 , 375 . Thus, in one configuration, the aforementioned means may be a TX processor 316 , 368 , an RX processor 356 , 370 , and a controller/processor 359 , 375 configured to perform the functions described by the aforementioned means. .

[00155] UL CW Update

[00156] UE-side CW window update, when the UE receives an uplink grant in a subframe, the reference subframe is the most recent subframe before the subframe in which the uplink grant is received (or the subframe before the subframe in which the uplink grant is received) number of frames), and the most recent subframe before the subframe in which the UE transmitted an uplink transmission, such as an uplink shared transmission, using a Type 1 channel access procedure. For example, when the UE transmits uplink transmissions, eg, uplink shared channel transmissions without gaps, the reference subframe may be the first subframe of the continuous transmission. Thus, the first slot of the last uplink burst may be used to determine the CW update. However, there may be multiple switching points. 11 illustrates an example 1100 in which a UE may transmit a PUSCH, switch to receive a downlink transmission from a base station, and switch back to uplink transmissions. 11 illustrates that the UE may transmit the PUCCH before returning to the transmission of the PUSCH. If the first subframe of continuous PUSCH transmission is used for the reference subframe, the PUSCH considered for the CW will not be the PUSCH at the beginning of the COT.

[00157] Thus, rather than based the uplink shared channel transmissions without gaps on the reference subframe, the reference subframe may be based on the first PUSCH in the COT. 11 , this will lead to the use of the first PUSCH, before switching to downlink reception, for the reference subframe for updating the CW.

[00158] Thus, when DL transmissions occur early in the COT and are the source of the COT's ACK/NACK information, the UE may update the CW based on whether a downlink transmission (eg, PDCCH or PDSCH) was successfully received during the COT. Yes (eg, doubling the CW on failure, resetting the CW to the minimum value on success).

[00159] In another example, the UE may update the CW based on downlink reception at the UE initiated COT. Thus, the downlink reception illustrated in FIG. 11 between PUSCH and PUCCH may be used to update the CW by the UE. For example, when the downlink reception is within a certain time period from the start of the COT and/or when the downlink reception is the source of the COT's feedback, the UE may use the downlink reception. For example, when the PDCCH and/or PDSCH is successfully received by the UE, the UE may reset the CW to a minimum value. If the PDCCH/PDSCH is not successfully received, the UE may increase the CW size (eg, doubling it).

[00160] 15 is a flowchart 1500 of a wireless communication method. The method may include a UE or a component of a UE (eg, a UE 104 , 350 , an apparatus 1802 , 1802 ′; a memory 360 , and may include an entire UE 350 or a component of the UE 350 , such as: processing system 1914 ), which may be TX processor 368 , RX processor 356 , and/or controller/processor 359 . Optional aspects are illustrated using dashed lines.

[00161] At 1502 , the UE determines the RD of the COT based on a first slot of the most recent set of uplink shared channel transmissions during the COT. The determination may be performed, for example, by reference duration determining component 1812 of apparatus 1802 . The most recent set of uplink shared channel transmissions may include non-contiguous uplink shared channel transmissions, eg, as described with respect to FIG. 11 .

[00162] At 1504 , the UE updates the CW based at least in part on the uplink shared channel transmission for the reference duration. The determination may be performed, for example, by reference transmission determining component 1814 of apparatus 1802 . The CW may be updated further based on downlink transmission during COT.

[00163] As illustrated at 1506 , the UE may perform LBT using the updated CW as determined at 1504 , eg, to transmit a downlink communication to the UE. LBT may be performed, for example, by the receiving component 1804 and/or the transmitting component 1810 of the apparatus 1802 . Communication between the base station and the UE may be performed on a shared spectrum or an unlicensed spectrum. For example, the communication may be based on NR-U.

[00164] 18 is a conceptual data flow diagram 1800 illustrating data flow between different means/components in an exemplary apparatus 1802 . The apparatus may be a UE or a component of a UE that communicates with the base station 1850 . The apparatus can include a receiving component configured to receive a downlink communication from a base station 1850 . The apparatus can include a transmitting component configured to transmit an uplink communication to a base station. The apparatus includes a reference duration determining component 1812 configured to determine a reference duration of the COT, the reference duration of a most recent set of uplink shared channel transmissions during the COT, eg, as described with respect to 1502 of FIG. 15 . based on the first slot. The apparatus includes a reference transmission determining component 1814 configured to determine a reference transmission, eg, as described with respect to FIG. 15 . For example, the apparatus can include a reference communication, eg, a UL and DL transmission handling component 1806 configured to assist in determining whether it is an uplink and/or a downlink. The apparatus includes a CW adjustment component 1816 configured to update the CW based at least in part on the uplink shared channel transmission for a reference duration, eg, as described with respect to 1506 of FIG. 15 .

[00165] The apparatus may include additional components for performing each of the blocks of the algorithm in the aforementioned flowcharts of FIGS. 4 and 15 . As such, each block in the aforementioned flowcharts of FIGS. 4 and 15 may be performed by a component, and the apparatus may include one or more of the components. The components may be one or more hardware components specifically configured to perform the described processes/algorithm, may be implemented by a processor configured to perform the described processes/algorithm, or a computer-readable medium for implementation by a processor. may be stored within, or some combination thereof.

[00166] 19 is a diagram 1900 illustrating an example of a hardware implementation for an apparatus 1802 ′ using a processing system 1914 . Processing system 1914 may be implemented with a bus architecture, represented generally by bus 1924 . Bus 1924 may include any number of interconnecting buses and bridges depending on the particular application of processing system 1914 and overall design constraints. Bus 1924 includes one or more processors and/or hardware components represented by processor 1904 , components 1804 , 1806 , 1810 , 1812 , 1814 , 1816 , and computer-readable medium/memory 1906 . Linking various circuits together. Bus 1924 may also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described any further.

[00167] The processing system 1914 may be coupled to the transceiver 1910 . The transceiver 1910 is coupled to one or more antennas 1920 . Transceiver 1910 provides a means for communicating with various other devices over a transmission medium. The transceiver 1910 receives a signal from one or more antennas 1920 , extracts information from the received signal, and provides the extracted information to a processing system 1914 , specifically a receive component 1804 . The transceiver 1910 also receives information from the processing system 1914 , specifically the transmit component 1810 , and generates a signal to be applied to the one or more antennas 1920 based on the received information. The processing system 1914 includes a processor 1904 coupled to a computer-readable medium/memory 1906 . The processor 1904 is responsible for general processing, including execution of software stored on the computer readable medium/memory 1906 . The software, when executed by the processor 1904 , causes the processing system 1914 to perform the various functions described above for any particular apparatus. The computer readable medium/memory 1906 may also be used to store data that is manipulated by the processor 1904 when executing software. Processing system 1914 further includes at least one of components 1804 , 1806 , 1810 , 1812 , 1814 , 1816 . The components may be software components executing on the processor 1904 , resident/stored on the computer-readable medium/memory 1906 , or may be one or more hardware components coupled to the processor 1904 , or these It may be some combination of The processing system 1914 may be a component of the base station 310 , and may include at least one of a TX processor 316 , an RX processor 370 and a controller/processor 375 , and/or memory 376 . . Alternatively, the processing system 1914 may be an entire base station (eg, see 310 in FIG. 3 ).

[00168] In one configuration, an apparatus 1802/1802 ′ for wireless communication provides means for determining a reference duration of a COT, the reference duration being based on a first slot of a most recent set of uplink shared channel transmissions during the COT. , and means for updating the CW based at least in part on the uplink shared channel transmission for the reference duration. The aforementioned means may be one or more of the aforementioned components of the apparatus 1802 and/or the processing system 1914 of the apparatus 1802 ′ configured to perform the functions described by the aforementioned means. As described above, the processing system 1914 may include a TX processor 316 , an RX processor 370 , and a controller/processor 375 . Thus, in one configuration, the aforementioned means may be a TX processor 316 , an RX processor 370 , and a controller/processor 375 configured to perform the functions described by the aforementioned means.

[00169] For example, techniques for determining reference transmissions for contention window update for NR-U have been described. Although these techniques have been described in the context of 5G NR, the techniques may also be applicable to other multiple-access technologies and communication standards using these techniques.

[00170] The following examples are illustrative only, and may be combined with other embodiments or aspects of the teachings described herein without limitation.

[00171] Example 1 is an apparatus for wireless communication in a wireless device, the apparatus comprising: a memory; and at least one processor coupled to the memory, the memory and the at least one processor configured to: determine a reference duration of the COT, the reference duration being based at least in part on the SCS and based on the reception of the PDSCH transmission; and update the CW based at least in part on reception of the PDSCH transmission during the reference duration.

[00172] In Example 2, the apparatus of Example 1 further includes that the PDSCH transmission is an unpunctured PDSCH transmission.

[00173] In Example 3, the apparatus of Examples 1 or 2 further includes wherein the reference duration includes an unpunctured slot including the PDSCH transmission, or an end of the PDSCH transmission.

[00174] In Example 4, the apparatus of any of Examples 1 - 3, wherein the reference duration is determined further based on whether the PDSCH transmission is punctured for the reference duration, wherein when the PDSCH transmission is punctured for the reference duration, the reference duration is: and extending by the number of slots.

[00175] In Example 5, the apparatus of any of Examples 1-4, further comprising extending the reference duration until an end of the shared channel transmission by the base station or a predetermined number of slots.

[00176] In Example 6, the apparatus of any of Examples 1 - 5, further comprising determining the reference duration based on the PDSCH transmission starting within the predetermined time or a predetermined number of symbols from the beginning of the slot.

[00177] In Example 7, the apparatus of any of Examples 1-6, wherein updating the CW comprises increasing the CW based at least in part on a negative acknowledgment received by the wireless device for the PDSCH transmission, or the PDSCH transmission and assigning to the CW a predetermined minimum value (CW_min) based at least in part on the positive acknowledgment received by the wireless device for

[00178] In Example 8, the apparatus of any of Examples 1-7, wherein updating the CW comprises increasing the CW based at least in part on not receiving any acknowledgment by the wireless device for the PDSCH transmission. include more

[00179] In Example 9, the apparatus of any of Examples 1-8, wherein the wireless device determines a first reference duration for the first SCS and a second reference duration for the second SCS, and wherein the wireless device is configured to: and updating the CW based on the first shared channel transmission based on the first SCS during and a second shared channel transmission based on the second SCS during a second reference duration.

[00180] In Example 10, the apparatus of any of Examples 1-9, wherein the memory and the at least one processor are configured to transmit the at least one reference PDSCH transmitted within a predetermined number of symbols or a predetermined amount of time from the start of the COT. and further configured to determine the at least one reference PDSCH transmission based on the control channel transmission for

[00181] In Example 11, the apparatus of any of Examples 1-10, wherein the at least one reference PDSCH transmission comprises: at least one reference PDSCH transmission that begins within a reference duration; at least one reference PDSCH transmission ending within a reference duration; at least one code block group (CBG) of at least one reference PDSCH transmission that at least partially overlaps the reference duration; or the at least one reference PDSCH transmission having a control channel transmission within a reference duration.

[00182] In Example 12, the apparatus of any of Examples 1-11, wherein the reference duration or reference PDSCH transmission is determined based on whether the PDSCH transmission comprises a broadcast without feedback, and wherein the reference PDSCH transmission is determined by the wireless device. and updating the CW based on the

[00183] In Example 13, the apparatus of any of Examples 1-12, further comprising extending the reference duration to include the PDSCH transmission with feedback.

[00184] In Example 14, the apparatus of any of Examples 1 - 13, wherein the reference duration is determined further based on whether at least one unpunctured code block group (CBG) is transmitted during the reference duration, and extending the reference duration when no unpunctured CBG is transmitted or no unpunctured shared channel transmission is transmitted.

[00185] In Example 15, the apparatus of any of Examples 1- 14, wherein the reference duration comprises: a first slot in which all shared channel transmissions are not punctured, a second slot comprising at least one unpunctured shared channel transmission; or wherein the at least one shared channel CBG is based on the unpunctured slot including at least one of the third unpunctured slot.

[00186] In Example 16, the apparatus of any of Examples 1-15, wherein the reference duration is a number of slots comprising punctured shared channel transmissions, and at least one unpunctured shared channel transmission or unpunctured and extending to include a slot comprising a CBG.

[00187] In Example 17, the apparatus of any of Examples 1 - 16, wherein the multiple slots include punctured transmissions, and the reference duration includes at least one unpunctured shared channel transmission or unpunctured CBG. and determining to include at least one of a plurality of slots comprising punctured downlink transmissions.

[00188] Example 18 is an apparatus for wireless communication at a wireless device, the apparatus comprising: means for determining a reference duration of a COT, the reference duration based at least in part on an SCS and based on receipt of a PDSCH transmission; and means for updating the CW based at least in part on reception of the PDSCH transmission during the reference duration.

[00189] In Example 19, the apparatus of Example 18 further includes means for performing the method (or method by the apparatus) of any of Examples 2-Example 17.

[00190] Example 20 is a method for wireless communication in a wireless device, the method comprising performing the method (or method by the apparatus) of any of Examples 1- 17.

[00191] Example 21 is a computer-readable medium storing computer-executable code for wireless communication in a wireless device, wherein the code, when executed by a processor, causes the processor to: method by the device).

[00192] Example 22 is an apparatus for wireless communication by a wireless device at a base station, the apparatus comprising: a memory; and at least one processor coupled to the memory, wherein the memory and the at least one processor are configured to: determine a reference duration of the COT, the reference duration being based at least in part on the SCS; determine at least one reference PDCCH transmission transmitted during the reference duration; and update the CW based at least in part on the uplink transmission having at least one reference PDCCH transmission transmitted during the reference duration.

[00193] In Example 23, the apparatus of Example 22 is configured such that the reference duration is determined based on at least one of a predefined minimum duration, a minimum SCS supported by the base station, or a minimum SCS used by the base station for the PDCCH at the start of the COT. include more

[00194] In Example 24, the apparatus of Examples 22 or 23 further includes determining the reference duration based on the number of slots or the number of symbols.

[00195] In Example 25, the apparatus of any of Examples 22-24 is further configured to include the COT comprising a first slot having a plurality of symbols, and wherein the reference duration is determined based on a number of symbols of the PDCCH transmission transmitted during the COT. include

[00196] In Example 26, the apparatus of any of Examples 22-25 is the at least one reference PDCCH having at least one of an earliest end symbol in a first slot of the COT, or an earliest start symbol in a first slot of the COT. and determining a reference duration based on the transmission.

[00197] In Example 27, the apparatus of any of Examples 22-26, further comprising determining the reference duration based on a predetermined number of symbols from the beginning of the COT or at least one reference PDCCH transmission starting within a predetermined time do.

[00198] In Example 28, the apparatus of any of Examples 22-27, wherein a first reference duration is determined for a first SCS used for a first PDCCH in the COT, and a second SCS used for a second PDCCH in the COT It further includes determining a second reference duration for .

[00199] In Example 28, the apparatus of any of Examples 22-28, further comprising: the CW is updated based on each uplink transmission having a PDCCH transmission transmitted for a reference duration.

[00200] In Example 30, the apparatus of any of Examples 22-29 is configured to update the CW based on each uplink transmission having a PDCCH transmission transmitted within a predetermined number of symbols or a predetermined amount of time from the start of the COT. includes more

[00201] In Example 31, the apparatus of any of Examples 22-30, further comprising: the reference duration is determined for each subband or the reference duration is commonly determined for multiple subbands.

[00202] Example 32 is an apparatus for wireless communication at a base station, the apparatus comprising: means for determining a reference duration of the COT, the reference duration being based at least in part on the SCS; means for determining at least one reference PDCCH transmission transmitted for a reference duration; and means for updating the CW based at least in part on an uplink transmission having at least one reference PDCCH transmission transmitted during the reference duration.

[00203] In Example 33, the apparatus of Example 32 further includes means for performing the method (or method by the apparatus) of any of Examples 23-31.

[00204] Example 34 is a method for wireless communication at a base station, comprising performing the method (or method by the apparatus) of any of Examples 22-31.

[00205] Example 35 is a computer-readable medium storing computer-executable code for wireless communication at a base station, wherein the code, when executed by a processor, causes the processor to: method) to be performed.

[00206] Example 36 is an apparatus for wireless communication at a base station, the apparatus comprising: a memory; and at least one processor coupled to the memory, wherein the memory and the at least one processor are configured to: determine a reference duration of the COT; to determine whether to use the reference PDSCH transmission or the reference PUSCH transmission to update the CW; and update the CW based on at least one of a reference PDSCH transmission or a reference PUSCH transmission, and a reference duration.

[00207] In Example 37, the apparatus of Example 36 is configured such that, when the PDSCH transmission has an associated feedback and is transmitted for a period of time from the start of the COT, the base station determines to not use the PUSCH transmission and to use the PDSCH transmission to update the CW. include more

[00208] Example 38 is an apparatus for wireless communication at a base station, the apparatus comprising: means for determining a reference duration of a COT; means for determining whether to use a reference PDSCH transmission or a reference PUSCH transmission to update the CW; and means for updating the CW based on at least one of a reference PDSCH transmission or a reference PUSCH transmission, and a reference duration.

[00209] Example 40 is a computer-readable medium storing computer-executable code for wireless communication at a base station, wherein the code, when executed by a processor, causes the processor to: determine a reference duration of the COT; determine whether to use the reference PDSCH transmission or the reference PUSCH transmission to update the CW; And update the CW based on at least one of the reference PDSCH transmission or the reference PUSCH transmission, and the reference duration.

[00210] Example 41 is an apparatus for wireless communication at a UE, the apparatus comprising: a memory; and at least one processor coupled to the memory, the memory and the at least one processor to determine a reference duration of the COT, the reference duration being in a first slot of a most recent set of uplink shared channel transmissions during the COT. basis ― ; and update the CW based at least in part on the uplink shared channel transmission for the reference duration.

[00211] Example 42 is an apparatus for wireless communication at a UE, the apparatus comprising: means for determining a reference duration of a COT, wherein the reference duration is based on a first slot of a most recent set of uplink shared channel transmissions during the COT; ; and means for updating the CW based at least in part on the uplink shared channel transmission for the reference duration.

[00212] Example 43 is a computer-readable medium storing computer-executable code for wireless communication at the UE, wherein the code, when executed by a processor, causes the processor to determine a reference duration of the COT, wherein the reference duration is the COT. based on the first slot of the most recent set of uplink shared channel transmissions during ; and update the CW based at least in part on the uplink shared channel transmission for the reference duration.

[00213] It is understood that the specific order or hierarchy of blocks in the processes/flow charts disclosed is illustrative of exemplary approaches. Based on design preferences, it is understood that the specific order or hierarchy of blocks in the processes/flow diagrams may be rearranged. Additionally, some blocks may be combined or omitted. The accompanying method claims present elements of the various blocks in a sample order, and are not intended to be limited to the specific order or hierarchy presented.

[00214] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Accordingly, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the wording of the claims, and references to elements in the singular, unless specifically stated to be "one and only one," It is not intended to mean so, but rather is intended to mean "one or more." The term “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. "at least one of A, B or C", "at least one of A, B or C", "at least one of A, B and C", "at least one of A, B and C" and "A, B, C or Combinations such as “any combination thereof” include any combination of A, B, and/or C, and may include multiple A, multiple B, or multiple C. Specifically, “A, B or “at least one of C”, “at least one of A, B or C”, “at least one of A, B and C”, “at least one of A, B and C” and “A, B, C or any thereof Combinations such as "combination of" can be A alone, B alone, C alone, A and B, A and C, B and C, or A and B and C, wherein any such combinations are A, B or C All structural and functional equivalents to the elements of various aspects described throughout this disclosure known to those skilled in the art or later known to those skilled in the art are expressly incorporated herein by reference. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. Terms such as “element”, “device”, etc. may not be substitutes for the term “means.” As such, a claim element includes means plus means unless the element is expressly described using the phrase “means for.” It shall not be construed as a means plus function.

Claims (30)

An apparatus for wireless communication in a wireless device, comprising:
Memory; and
at least one processor coupled to the memory;
The memory and the at least one processor,
determine a reference duration of a channel occupancy time (COT), the reference duration being based at least in part on subcarrier spacing (SCS) and based on reception of a physical downlink shared channel (PDSCH) transmission; And
and update a contention window (CW) based at least in part on reception of the PDSCH transmission during the reference duration. According to claim 1,
wherein the PDSCH transmission is an unpunctured PDSCH transmission. 3. The method of claim 2,
wherein the reference duration comprises an end of a slot comprising an unpunctured PDSCH transmission or an end of an unpunctured PDSCH transmission. 4. The method of claim 3,
The reference duration is further determined based on whether the PDSCH transmission is punctured for the reference duration, wherein the reference duration is extended by a number of slots when the PDSCH transmission is punctured for the reference duration. device for wireless communication in 5. The method of claim 4,
and the reference duration is extended until an end of a shared channel transmission by a base station or a predetermined number of slots. According to claim 1,
and the reference duration is determined based on the PDSCH transmission starting within a predetermined time or a predetermined number of symbols from the beginning of a slot. According to claim 1,
Updating the CW includes increasing the CW based at least in part on a negative acknowledgment received by the wireless device for the PDSCH transmission, or receiving by the wireless device for the PDSCH transmission. and assigning to the CW a predetermined minimum value (CW_min) based at least in part on a received positive acknowledgment. According to claim 1,
and updating the CW comprises increasing the CW based at least in part on not receiving any acknowledgment by the wireless device for the PDSCH transmission. According to claim 1,
the wireless device determines a first reference duration for the first SCS and a second reference duration for the second SCS, and
The wireless device is configured to update the CW based on a first shared channel transmission based on the first SCS for the first reference duration and a second shared channel transmission based on the second SCS for the second reference duration. An apparatus for wireless communication in a wireless device. According to claim 1,
The memory and the at least one processor,
and determine the at least one reference PDSCH transmission based on a control channel transmission for the at least one reference PDSCH transmission transmitted within a predetermined number of symbols or a predetermined amount of time from the start of the COT. An apparatus for wireless communication in a device. 11. The method of claim 10,
The at least one reference PDSCH transmission is
the at least one reference PDSCH transmission initiated within the reference duration;
the at least one reference PDSCH transmission ending within the reference duration;
at least one code block group (CBG) of the at least one reference PDSCH transmission that at least partially overlaps the reference duration; or
The at least one reference PDSCH transmission with the control channel transmission within the reference duration.
An apparatus for wireless communication in a wireless device, which is determined based on at least one of: According to claim 1,
The reference duration or the reference PDSCH transmission is determined based on whether the PDSCH transmission includes a broadcast without feedback,
and the CW is updated based on the reference PDSCH transmission determined by the wireless device. 13. The method of claim 12,
and the reference duration is extended to include the PDSCH transmission with the feedback. According to claim 1,
the reference duration is determined further based on whether at least one unpunctured code block group (CBG) is transmitted during the reference duration, and
The reference duration is extended when no unpunctured CBG is transmitted or no unpunctured shared channel transmission is transmitted during the reference duration. According to claim 1,
The reference duration is
a first slot in which all shared channel transmissions are not punctured;
a second slot comprising at least one unpunctured shared channel transmission, or
Third slot in which at least one shared channel CBG is not punctured
An apparatus for wireless communication in a wireless device that is based on an unpunctured slot comprising at least one of: According to claim 1,
The reference duration is extended to include a plurality of slots comprising punctured shared channel transmissions, and a slot comprising at least one unpunctured shared channel transmission or unpunctured CBG. Device for wireless communication. According to claim 1,
multiple slots contain punctured transmissions,
wherein the reference duration is determined to include at least one of a slot including at least one unpunctured shared channel transmission or an unpunctured CBG, and at least one of a plurality of slots comprising punctured downlink transmissions, An apparatus for wireless communication in a wireless device. An apparatus for wireless communication by a wireless device in a base station, comprising:
Memory; and
at least one processor coupled to the memory;
The memory and the at least one processor,
determine a reference duration of a channel occupancy time (COT), the reference duration being based at least in part on subcarrier spacing (SCS);
determine at least one reference physical downlink control channel (PDCCH) transmission transmitted during the reference duration; And
and update a contention window (CW) based at least in part on an uplink transmission having the at least one reference PDCCH transmission transmitted during the reference duration. 19. The method of claim 18,
The reference duration is
predefined minimum duration,
Minimum SCS supported by the base station, or
Minimum SCS used by the base station for the PDCCH at the start of the COT
An apparatus for wireless communication by a wireless device at a base station, which is determined based on at least one of: 19. The method of claim 18,
wherein the reference duration is determined based on a number of slots or a number of symbols. 19. The method of claim 18,
The COT includes a first slot having a plurality of symbols,
and the reference duration is determined based on a number of symbols of a PDCCH transmission transmitted during the COT. 22. The method of claim 21,
The reference duration is
the earliest end symbol in the first slot of the COT, or
The earliest start symbol in the first slot of the COT
An apparatus for wireless communication by a wireless device at a base station that is determined based on the at least one reference PDCCH transmission having at least one of: 23. The method of claim 22,
and the reference duration is determined based on the at least one reference PDCCH transmission starting within a predetermined number of symbols or a predetermined time from the start of the COT. 23. The method of claim 22,
A radio in the base station, wherein a first reference duration is determined for a first SCS used for a first PDCCH in the COT, and a second reference duration is determined for a second SCS used for a second PDCCH in the COT An apparatus for wireless communication by a device. 19. The method of claim 18,
wherein the CW is updated based on each uplink transmission having a PDCCH transmission transmitted during the reference duration. 19. The method of claim 18,
wherein the CW is updated based on each uplink transmission having a PDCCH transmission transmitted within a predetermined number of symbols or a predetermined amount of time from the start of the COT. . 19. The method of claim 18,
The apparatus for wireless communication by a wireless device in a base station, wherein the reference duration is determined for each subband or the reference duration is determined commonly for a plurality of subbands. An apparatus for wireless communication in a base station, comprising:
Memory; and
at least one processor coupled to the memory;
The memory and the at least one processor,
to determine a reference duration of channel occupancy time (COT);
to determine whether to use a reference physical downlink shared channel (PDSCH) transmission or a reference physical uplink shared channel (PUSCH) transmission to update a contention window (CW); And
and update the CW based on at least one of the reference PDSCH transmission or the reference PUSCH transmission, and the reference duration. 29. The method of claim 28,
When the PDSCH transmission is transmitted for a period of time from the start of the COT with associated feedback, the base station decides to use the PDSCH transmission rather than the PUSCH transmission to update the CW. device for. An apparatus for wireless communication in user equipment (UE), comprising:
Memory; and
at least one processor coupled to the memory;
The memory and the at least one processor,
determine a reference duration of a channel occupancy time (COT), wherein the reference duration is based on a first slot of a most recent set of uplink shared channel transmissions during the COT; And
An apparatus for wireless communication at a UE, configured to update a contention window (CW) based at least in part on an uplink shared channel transmission for a reference duration.

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