Subchannel-based occupancy time sharing for unlicensed sidelink

Abstract

Described are methods, systems, and devices for wireless communications. In some systems, user equipment (UE) can communicate on a sidelink channel in a shared (e.g., unlicensed) channel bandwidth. The UE can implement subchannel-based time-share of the unlicensed sidelink to improve resource usage. The UE can take access to the shared channel bandwidth for a time-share, and can transmit a sharing indicator indicating a portion of resources of the shared channel bandwidth for the time-share. The UE can transmit a time division multiplexed sharing indicator to share a portion of time slots of the time-share, a frequency division multiplexed sharing indicator to share a portion of subchannels of the shared channel bandwidth, or some combination thereof. A UE receiving the sharing indicator can identify the shared resources, and can transmit in (e.g., not perform a full contention procedure for) the shared resources.

Description

[0001] Cross-references to related applications

[0002] This patent application claims the benefit of U.S. Provisional Patent Application No. 63 / 040,890, filed June 18, 2020, entitled “Subchannel-based Occupancy Time Sharing for Unlicensed Side Link”, by Xue et al.; and U.S. Patent Application No. 17 / 229,642, filed April 13, 2021, entitled “Subchannel-based Occupancy Time Sharing for Unlicensed Side Link”, by Xue et al.; each of which is assigned to the assignee herein. Technical Field

[0003] The following content generally relates to wireless communication, and more specifically, to subchannel-based time-of-use sharing on unlicensed side walkways. Background Technology

[0004] Wireless communication systems are deployed across the board to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. These systems are capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (such as Long Term Evolution (LTE), LTE-Advanced (LTE-A), or LTE-A Pro systems) and fifth-generation (5G) systems (often referred to as New Radio (NR) systems). These systems can employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Spread Spectrum Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication with multiple communication devices (often referred to as User Equipment (UE)).

[0005] In some wireless communication systems, UEs can communicate with each other via sidelink channels. In one aspect, a UE can send sidelink control information (SCI) and sidelink data messages to one or more other UEs via one or more sidelink channels. In some cases, UEs can utilize sidelink communication in shared (e.g., unlicensed) channel bandwidth. A UE can perform a channel access procedure to obtain access to shared channel bandwidth for a channel occupancy time (COT), thereby performing transmissions on the sidelink channel. However, efficient resource utilization of sidelink communication in shared channel bandwidth can present challenges. Summary of the Invention

[0006] This disclosure relates to methods, systems, apparatuses, and devices for supporting subchannel-based occupancy time sharing in sidelink communication over shared (e.g., unlicensed) channels. Generally, the described techniques are used for channel occupancy time (COT) sharing by user equipment (UE) in sidelinks to support reliable and robust sidelink channel access. In some aspects, the UE can implement subchannel-based COT sharing in the sidelink to improve resource utilization. The UE can acquire access to the shared channel bandwidth of the COT and can transmit a sharing indicator indicating a portion of the shared channel bandwidth resources for sharing. In one aspect, the UE can transmit the sharing indicator in a specific subchannel or resource set to indicate sharing information to the receiving UE. In some aspects, the UE can transmit a time-division multiplexing (TDM) sharing indicator to share a portion of the time slot of the COT, a frequency-division multiplexing (FDM) sharing indicator to share a portion of the subchannel of the shared channel bandwidth, or some combination thereof. The UE receiving the sharing indicator can identify the shared resources and can transmit within these shared resources of the COT (e.g., without performing the full contention process of the COT). In some respects, the UE providing the sharing opportunity and the UE receiving the shared information can concurrently transmit sidelink data messages in the COT using FDM shared resources. Alternatively or additionally, the UE providing the sharing opportunity can avoid transmitting during TDM shared resources (e.g., the UE can transmit sidelink data messages in the COT until TDM shared resources are available, and can avoid transmitting additional sidelink data messages in the COT during TDM shared resources). In some respects, the COT sharing process can support robustness to interference sources while efficiently utilizing shared channel bandwidth resources.

[0007] The described method is a wireless communication method. The method may include: obtaining access to a shared channel bandwidth for an occupancy period based on a channel access procedure; identifying a resource set for transmitting a sharing indicator; transmitting a sidelink control message including a sharing indicator on a sub-channel of the shared channel bandwidth, the sharing indicator indicating TDM sharing for a portion of the occupancy period, FDM sharing for a portion of the occupancy period, or a combination thereof; and communicating during the occupancy period based on the sharing indicator.

[0008] The described device is a wireless communication apparatus. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executed by the processor to cause the apparatus to: acquire access to a shared channel bandwidth for an occupancy period based on a channel access procedure; identify a resource set for transmitting a sharing indicator; transmit a sidelink control message including a sharing indicator on a sub-channel of the shared channel bandwidth, the sharing indicator indicating TDM sharing for a portion of the occupancy period, FDM sharing for a portion of the occupancy period, or a combination thereof; and communicate during the occupancy period based on the sharing indicator.

[0009] The description also pertains to wireless communication. This apparatus may include means for: obtaining access to a shared channel bandwidth for an occupancy period based on a channel access procedure; identifying a resource set for transmitting a sharing indicator; transmitting a sidelink control message including a sharing indicator on a sub-channel of the shared channel bandwidth, the sharing indicator indicating TDM sharing for a portion of the occupancy period, FDM sharing for a portion of the occupancy period, or a combination thereof; and communicating during the occupancy period based on the sharing indicator.

[0010] What is described is a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions executable by a processor to: obtain access to a shared channel bandwidth for an occupancy period based on a channel access procedure; identify a resource set for transmitting a sharing indicator; transmit a sidelink control message including a sharing indicator on a subchannel of the shared channel bandwidth, the sharing indicator indicating TDM sharing for a portion of the occupancy period, FDM sharing for a portion of the occupancy period, or a combination thereof; and communicate during the occupancy period based on the sharing indicator.

[0011] In some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein, a sharing indicator may indicate at least FDM sharing of a first sub-channel with shared channel bandwidth. In some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein, communication may include operations, features, devices, or instructions for concurrently transmitting sidelink data messages on a second sub-channel with shared channel bandwidth during an occupancy period, in response to a sidelink transmission performed by the UE on the first sub-channel.

[0012] In some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein, a sharing indicator may indicate at least TDM sharing of a second time slot of occupancy time. In some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein, communication may include operations, features, devices, or instructions for transmitting sidelink data messages in a first time slot of occupancy time preceding the second time slot of occupancy time, and for avoiding transmission during the second time slot of occupancy time.

[0013] Some aspects of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, devices, or instructions for acquiring access to the shared channel bandwidth and transmitting a first occupancy signal before the resource set, and transmitting a second occupancy signal after the transmission-side link control message is completed and before the second time slot.

[0014] In some aspects of the methods, apparatus, and non-transitory computer-readable media described herein, a side link control message including a sharing indicator may be sent in a first time slot of the occupancy time, and the sharing indicator may indicate a second time slot of the occupancy time so as to share a portion of the occupancy time.

[0015] In some aspects of the methods, apparatus, and non-transitory computer-readable media described herein, the sharing indicator also indicates the Listen-After-Speak (LBT) type, Channel Access Priority Class (CAPC), Energy Detection (ED) threshold, Distance threshold, Interleaved Frequency Resource Set, Device Identifier, Location Information, or a combination thereof, in response to UE sharing occupancy time.

[0016] Some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, devices, or instructions for: receiving from a base station a shared indicator configuration message indicating a resource set for transmitting a shared indicator, wherein the resource set may be identified, and a side link control message may be transmitted based on the shared indicator configuration message; and sending to the base station a report confirming the transmission of a side link control message that includes a shared indicator in the resource set.

[0017] Some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, devices, or instructions for: receiving from a base station a shared indicator configuration message indicating a resource set for transmitting a shared indicator, wherein the resource set may be identified, and sidelink control messages may be transmitted based on the shared indicator configuration message; monitoring for conflicts in portions of occupancy time, resource sets, or both on the sidelink feedback channel; and, based on the monitoring, transmitting a report message to the base station.

[0018] In some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying a resource set may include operations, features, devices, or instructions for: identifying a set of resource sets based on System Information Block (SIB) messages, dedicated Radio Resource Control (RRC) messages, Downlink Control Information (DCI) messages, pre-configuration, or combinations thereof; and selecting from a set of resource sets a resource set for transmitting a sharing indicator, wherein a side-link control message including the sharing indicator may be transmitted in the selected resource set.

[0019] In some aspects of the methods, apparatus, and non-transitory computer-readable media described herein, the resource set indicates the LBT type, CAPC, ED threshold, or a combination thereof for UE-shared occupancy time.

[0020] Some aspects of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, devices, or instructions for: determining the earliest check-out time of an occupancy period based on a CAPC, an ED threshold, or a combination thereof, wherein a portion of the occupancy period may be based on the earliest check-out time of the occupancy period.

[0021] In some aspects of the methods, apparatus, and non-transitory computer-readable medium described herein, the channel access procedure may include an LBT procedure. Some aspects of the methods, apparatus, and non-transitory computer-readable medium described herein may also include operations, features, devices, or instructions for: performing an LBT procedure for a shared channel bandwidth, wherein obtaining access to the shared channel bandwidth for an occupancy period may be based on the success of the LBT procedure; and wherein performing the LBT procedure may include operations, features, devices, or instructions for monitoring the energy level of the shared channel bandwidth during a contention window that may be asynchronous with frame timing associated with communication, wherein obtaining access to the shared channel bandwidth for an occupancy period may be based on the energy level being below an ED threshold within the contention window.

[0022] The described method is a wireless communication method. The method may include: receiving from a UE a sidelink control message including a sharing indicator from a resource set on a subchannel of shared channel bandwidth; determining TDM sharing, FDM sharing, or a combination thereof for a portion of the occupancy time indicated by the sharing indicator; obtaining access to the shared channel bandwidth for the portion of the occupancy time based on the sharing indicator and a channel access procedure performed by the UE for the shared occupancy time; and transmitting a sidelink data message during the occupancy time portion based on the obtained access to the shared channel bandwidth.

[0023] The described device is an apparatus for wireless communication. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executed by the processor to cause the apparatus to: receive a sidelink control message including a sharing indicator from a UE on a subchannel of shared channel bandwidth; determine TDM sharing, FDM sharing, or a combination thereof, for a portion of the occupancy time indicated by the sharing indicator; acquire access to the shared channel bandwidth for the portion of the occupancy time based on the sharing indicator and the channel access procedure performed by the UE for the shared occupancy time; and, based on the acquired access to the shared channel bandwidth, transmit a sidelink data message during the occupancy time portion.

[0024] The description also pertains to wireless communication. This apparatus may include devices configured to: receive from a UE a sidelink control message, including a sharing indicator, from a resource set on a subchannel of shared channel bandwidth; determine TDM sharing, FDM sharing, or a combination thereof, for a portion of the occupancy time indicated by the sharing indicator; acquire access to the shared channel bandwidth for the portion of the occupancy time based on the sharing indicator and a channel access procedure performed by the UE for the shared occupancy time; and, based on the acquired access to the shared channel bandwidth, transmit a sidelink data message during the occupancy time portion.

[0025] What is described is a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions executable by a processor to: receive from a UE a sidelink control message including a sharing indicator from a resource set on a subchannel of shared channel bandwidth; determine TDM sharing, FDM sharing, or a combination thereof for a portion of the occupancy time indicated by the sharing indicator; obtain access to the shared channel bandwidth for the portion of the occupancy time based on the sharing indicator and the channel access procedure performed by the UE for the shared occupancy time; and, based on the obtained access to the shared channel bandwidth, transmit a sidelink data message in the portion of the occupancy time.

[0026] In some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein, a sharing indicator may indicate at least FDM sharing of a first sub-channel of the shared channel bandwidth. In some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein, transmission may also include operations, features, devices, or instructions for concurrently transmitting sidelink data messages on the first sub-channel of the shared channel bandwidth during the occupancy period, with sidelink transmissions performed by the UE on a second sub-channel of the shared channel bandwidth.

[0027] In some aspects of the methods, apparatus, and non-transitory computer-readable media described herein, a sharing indicator may indicate at least TDM sharing of a second time slot of occupancy time. In some aspects of the methods, apparatus, and non-transitory computer-readable media described herein, transmission may also include operations, features, devices, or instructions for avoiding transmission during a first time slot of occupancy time preceding the second time slot of occupancy time, and for transmitting a sidelink data message during the second time slot of occupancy time.

[0028] In some aspects of the methods, apparatus, and non-transitory computer-readable media described herein, a channel access procedure for sharing occupancy time may include an LBT procedure. Some aspects of the methods, apparatus, and non-transitory computer-readable media described herein may include operations, features, devices, or instructions for: performing an LBT procedure for sharing channel bandwidth based on a portion of the occupancy time, wherein access to the shared channel bandwidth for the portion of the occupancy time can be based on a successful LBT procedure.

[0029] In some aspects of the methods, apparatus, and non-transitory computer-readable media described herein, the LBT process includes a first LBT process corresponding to a first monitoring duration, the first monitoring duration being shorter than the second monitoring duration of a second LBT process associated with a contention occupancy time.

[0030] Some aspects of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, devices, or instructions for: entering a sleep mode based on receiving a shared indicator in a first time slot of the occupancy period; and exiting the sleep mode before a second time slot of the occupancy period. Attached Figure Description

[0031] Figure 1 and 2 Examples of wireless communication systems based on subchannel occupancy time sharing that support unlicensed sidelinks according to various aspects of this disclosure are shown.

[0032] Figures 3 to 5 Examples of subchannels based on subchannel occupancy time sharing that support unlicensed side links according to various aspects of this disclosure are shown.

[0033] Figure 6 An example of a process flow for supporting unlicensed side link based on subchannel occupancy time sharing is shown according to various aspects of this disclosure.

[0034] Figure 7 and 8 A block diagram of an apparatus supporting subchannel-based occupancy time sharing for unlicensed sidelinks is shown, according to various aspects of this disclosure.

[0035] Figure 9 A block diagram is shown of a communication manager supporting unlicensed side-link based on subchannel occupancy time sharing, according to various aspects of this disclosure.

[0036] Figure 10 A diagram of a system including a device supporting unlicensed side link based on subchannel occupancy time sharing is shown according to various aspects of this disclosure.

[0037] Figures 11 to 15A flowchart illustrating a method for subchannel-based occupancy time sharing supporting unlicensed side links, as described in various aspects of this disclosure, is shown. Detailed Implementation

[0038] In some wireless communication systems, a User Equipment (UE) can communicate with one or more additional UEs via a sidelink communication channel. In one aspect, a UE can transmit sidelink control information (SCI) and sidelink data messages to one or more other UEs via a Physical Sidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel (PSSCH), or a combination thereof. In some cases, a UE can utilize sidelink communication in a shared (e.g., unlicensed) channel. A UE can perform a channel access procedure to obtain access to the shared channel bandwidth for the Channel Occupied Time (COT), thereby performing transmissions on the sidelink channel. However, allocating all shared channel bandwidth resources to a UE during the COT can lead to inefficient use of the shared channel bandwidth. This procedure may restrict sidelink channel access for other UEs, for example, preventing a UE from obtaining channel access due to interfering neighboring nodes.

[0039] To support reliable and robust sidelink channel access, the UE can implement subchannel-based time-of-occupancy sharing of shared channel bandwidth. In one aspect, the UE can use a Listen-Before-Speak (LBT) procedure to acquire access to the shared channel bandwidth from the COT. In some cases, the UE can identify portions of channel resources to share with other UEs for sidelink transmission. The UE (e.g., referred to as the sharing provider UE) can send a sharing indicator indicating a portion of the shared channel bandwidth resources from the COT. In one aspect, the UE can send a Time Division Multiplexing (TDM) sharing indicator to share portions of the COT's time slots, a Frequency Division Multiplexing (FDM) sharing indicator to share portions of the channel bandwidth's subchannels, or some combination thereof. The UE receiving the sharing indicator (e.g., referred to as the sharing receiver UE) can identify the shared resource, acquire access to the shared resource (e.g., without performing the full COT contention procedure), and transmit sidelink data within the shared resource. Therefore, the sharing receiver UE can reduce the latency involved in accessing the channel used for sidelink transmission, thereby effectively mitigating the negative impact of potential interference sources.

[0040] In some respects, the sharing provider UE can implement FDM sharing, TDM sharing, or a combination thereof. For FDM sharing, the sharing provider UE can share a portion of the shared channel bandwidth in a time slot for one or more other UEs to transmit sidelink data. The sharing provider UE can concurrently transmit sidelink data in another portion of the shared channel bandwidth in a time slot (e.g., a portion not shared by the sharing indicator). For TDM sharing, the sharing provider UE can share the entire shared channel bandwidth in a time slot for one or more other UEs to transmit sidelink data. The sharing provider UE can transmit sidelink data in the time slot of the COT preceding the TDM shared resources and can avoid transmitting additional sidelink data messages in the TDM shared time slot. In some cases, the sharing provider UE can use FDM sharing to share the first part of the COT and can use TDM sharing to share the second part of the COT.

[0041] In some respects, a shared receiver UE can be configured to search for specific sharing indicators within a specific monitoring window. The shared receiver UE can monitor sharing indicators across multiple resource sets, which can be configured semi-statically or dynamically. In some cases, each resource set can implicitly indicate sharing information for the COT. Additionally or alternatively, the sharing indicator can include sharing information for the COT in one or more fields. This sharing information can indicate TDM sharing, FDM sharing, shared resource sets (e.g., frequency resources, time resources, or both), LBT type for channel access, channel access priority category (CAPC), energy detection (ED) threshold, or any combination of these or other relevant sharing information.

[0042] The aspects of this disclosure are initially described in the context of a wireless communication system. Additional aspects of this disclosure will be described with reference to subchannels and process flows. The aspects of this disclosure are also illustrated and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to subchannel-based time-of-use sharing of unlicensed side walkways.

[0043] Figure 1 An example of a wireless communication system 100 supporting unlicensed side walkways based on subchannel occupancy time sharing is illustrated according to various aspects of this disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some aspects, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some aspects, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0044] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. The coverage area 110 can be an example of a geographical area, and base stations 105 and UE 115 can support signal communication within that geographical area according to one or more radio access technologies.

[0045] UE 115 can be distributed throughout the entire coverage area 110 of wireless communication system 100, and each UE 115 can be fixed, mobile, or fixed or mobile at different times. UE 115 can be devices of different forms or with different capabilities. Figure 1 Some example UE 115s are shown. The UE 115 described herein is capable of communicating with various types of devices, such as... Figure 1 Other UE115, base station 105, or network equipment shown (e.g., core network node, relay equipment, integrated access and backhaul (IAB) node, or other network equipment).

[0046] Base station 105 may communicate with core network 130, communicate with each other, or both. In one aspect, base station 105 may be connected to core network 130 via an interface through one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) or both on backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some aspects, backhaul link 120 may be or include one or more radio links.

[0047] One or more base stations 105 described herein may include, or may be referred to by those skilled in the art as, base station, radio base station, access point, radio transceiver, NodeB, eNodeB (eNB), next-generation NodeB or giga-NodeB (both may be referred to as gNB), home NodeB, home eNodeB or other suitable terms.

[0048] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other appropriate term, wherein "device" may also be an example of a cell, station, terminal, or client. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some aspects, UE 115 may include or be referred to as an example of a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which may be implemented in various objects such as home appliances, or vehicles, meters, etc.

[0049] The UE 115 described in this article is capable of communicating with various types of devices, such as... Figure 1 Examples of other UE115s shown (which may sometimes act as relays), as well as base station 105 and network equipment (including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations).

[0050] UE 115 and base station 105 can wirelessly communicate with each other on one or more carriers via one or more communication links 125. The term "carrier" can refer to a collection of radio frequency (RF) spectrum resources having a defined physical layer structure supporting the communication link 125. In one aspect, a carrier for the communication link 125 may include a portion (e.g., a bandwidth portion (BWP)) of a radio frequency spectrum band operating according to one or more physical layer channels of a given radio access technology (e.g., LTE, LTE-A, LTE-APro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating the operation of the carrier, user data, or other signaling. The wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation can be used for both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0051] In some respects (e.g., in a carrier aggregation configuration), a carrier may also have control signaling or acquisition signaling to coordinate the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and can be located according to a channel grid for discovery by UE 115. A carrier may operate in standalone mode (where initial acquisition and connection can be made by UE 115 via the carrier) or in non-standalone mode (using different carriers (e.g., the same or different radio access technologies) to anchor the connection).

[0052] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. A carrier may (e.g., in FDD mode) carry downlink or uplink communication, or may be configured (e.g., in TDD mode) to carry both downlink and uplink communication.

[0053] A carrier can be associated with a specific bandwidth of the radio frequency spectrum, and in some respects, the carrier bandwidth can be referred to as the "system bandwidth" of the carrier or wireless communication system 100. In one respect, the carrier bandwidth can be one of several defined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) can have a hardware configuration that supports communication over a specific carrier bandwidth, or can be configured to support communication over one carrier bandwidth in a set of carrier bandwidths. In some respects, the wireless communication system 100 can include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some respects, each served UE 115 can be configured to operate on a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0054] The signal waveform transmitted on a carrier can consist of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Propagation OFDM (DFT-S-OFDM). In a system employing MCM, a resource element can consist of one symbol period (e.g., the duration of a modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and using multiple spatial layers can also improve the data rate or data integrity of communication with the UE 115.

[0055] One or more parameter sets (numerologies) of a carrier can be supported, where the parameter set may include subcarrier spacing (Δf) and cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter sets. In some respects, the UE 115 can be configured with multiple BWPs. In some respects, a single BWP of a carrier can be active at a given time, and the communication of the UE 115 can be restricted to one or more active BWPs.

[0056] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, which can refer to T. s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, and N f This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., from 0 to 1023).

[0057] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some respects, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may also be divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol durations (e.g., depending on the length of the cyclic prefix preset to each symbol period). In some wireless communication systems 100, time slots may also be divided into multiple mini-slots, each mini-slot containing one or more symbols. Without the cyclic prefix, each symbol period may contain one or more (e.g., N) symbols. f (Number) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0058] A subframe, time slot, mini-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some respects, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0059] Physical channels can be multiplexed on a carrier using various technologies. One or more of TDM, FDM, or hybrid TDM-FDM technologies can be used to multiplex physical control channels and physical data channels on a downlink carrier. The control region (e.g., control resource set (CORESET)) of the physical control channel can be defined by several symbol periods and can be extended over the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. In one aspect, one or more UEs 115 can monitor or search for control information in a control region based on one or more search space sets, and each search space set can include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level of the control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCE)) associated with coded information in a control information format with a given payload size. The search space set can include a common search space set configured for sending control information to multiple UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0060] In some respects, base station 105 may be mobile, thereby providing communication coverage to mobile geographic coverage areas 110. In some respects, different geographic coverage areas 110 associated with different technologies may overlap, although different geographic coverage areas 110 may be supported by the same base station 105. In other respects, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include a heterogeneous network, wherein different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0061] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately time-aligned. For asynchronous operation, base stations 105 may have different frame timing, and in some respects, transmissions from different base stations 105 may be time-misaligned. The techniques described herein can be used for both synchronous and asynchronous operation.

[0062] Some UE 115s can be configured to operate in power-saving modes, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some respects, half-duplex communication can be performed at reduced peak rates. Other power-saving techniques for UE 115 include entering a power-saving deep sleep mode when not initiating active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. In one respect, some UE 115s can be configured to operate using a narrowband protocol type, wherein the narrowband protocol type is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a carrier's guard band, or outside a carrier.

[0063] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. In one aspect, wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services, such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData). Support for mission-critical functions may include service prioritization, and mission-critical services may be used for public safety or general business applications. In this document, the terms “ultra-reliable,” “low-latency,” “mission-critical,” and “ultra-reliable low-latency” are used interchangeably.

[0064] In some respects, UE 115 can also communicate directly with other UE 115 on D2D communication link 135 (e.g., using point-to-point (P2P) or device-to-device (D2D) protocols). One or more UE 115s utilizing D2D communication may be located within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be located outside the geographic coverage area 110 of base station 105 or unable to receive transmissions from base station 105. In some respects, a group of UE 115s communicating via D2D communication can utilize a one-to-many (1:M) system, wherein each UE 115 transmits to every other UE 115 in the group. In some respects, base station 105 facilitates resource scheduling for D2D communication. In other cases, D2D communication is performed between UE 115s without the involvement of base station 105.

[0065] In some systems, the D2D communication link 135 may be an example of a communication channel between vehicles (e.g., UE 115), such as a side-link communication channel. In some aspects, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination thereof. Vehicles may signal information related to traffic conditions, traffic signal control, weather, safety, emergencies, or any other information relevant to the V2X system. In some aspects, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside devices), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or communicate with both.

[0066] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), and can include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) routing packets or interconnecting with external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to network operator IP service 150. Operator IP service 150 can include access to the Internet, intranet, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0067] Some network devices (such as base station 105) may include sub-components (such as access network entity 140), which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145 (which may be referred to as a radio head, smart radio head, or transmit / receive point (TRP)). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio head and ANC) or combined into a single network device (e.g., base station 105).

[0068] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the region from 300 MHz to 3 GHz is referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength is approximately one decimeter to one meter. UHF waves may be blocked or redirected by buildings and environmental features, but UHF waves are sufficient to penetrate structures to enable macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0069] Wireless communication system 100 can utilize licensed and unlicensed radio frequency spectrum bands. In one aspect, wireless communication system 100 can employ Licensed Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio frequency spectrum bands, devices (such as base station 105 and UE 115) can employ carrier sensing to detect and avoid collisions. In some aspects, operation in unlicensed frequency bands can be based on component carriers (e.g., LAA) and carrier aggregation configurations operating in licensed frequency bands. Operation in unlicensed spectrum can include examples such as downlink transmission, uplink transmission, P2P transmission, or D2D transmission.

[0070] In some cases, a channel may be shared among multiple licensed operators, or a channel may be licensed to one or more operators, with other operators or devices having access at their discretion. As used herein, a shared channel refers to an unlicensed channel, or a channel shared among one or more operators or having access at their discretion. Therefore, a shared radio frequency channel can be obtained prior to transmission (e.g., via a successful LBT procedure indicating the availability of the shared radio frequency channel). LBT procedures can also be defined according to several categories. Examples of LBT categories include Category 1 LBT (Cat1 LBT), Category 2 LBT (Cat2 LBT), Category 3 LBT (Cat3 LBT), and Category 4 LBT (Cat4 LBT). Cat1 LBT may not include an LBT. Cat2 LBT may include channel sensing, but no backoff time (e.g., pseudo-random backoff, etc.) if the channel is busy. Cat3 LBT may include channel sensing with pseudo-random backoff (if the channel is busy) and a fixed-size contention window. Cat4 LBT may include channel sensing with pseudo-random backoff (if the channel is busy) and a variable-size contention window. In some cases, Cat4 LBT may also be referred to as Type 1 LBT, while Cat1 LBT and Cat2 LBT may be referred to as variants of Type 2 LBT. In one aspect, a Type 2 LBT process may include a first LBT process (e.g., Type 2A), a second LBT process (e.g., Type 2B), and a third LBT process (e.g., Type 2C), wherein the first LBT process has a first sensing duration (e.g., 25 µs) which may be used when the channel is reserved but remains occupied until transmission begins; the second LBT process has a second sensing duration (e.g., 16 µs) which may be used when the channel is reserved and remains occupied for a gap less than the first sensing duration until transmission begins; and the third LBT process has a suppressed sensing duration (e.g., no sensing before transmission) which may be used for a gap (e.g., less than the second sensing duration) until transmission begins.

[0071] Base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which can support MIMO operation or transmit or receive beamforming. In one aspect, one or more base station antennas or antenna arrays may be commonly located at an antenna assembly, such as an antenna tower. In some aspects, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array containing several rows and columns of antenna ports, wherein base station 105 can use the antenna ports to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays capable of supporting various MIMO or beamforming operations. Additionally or alternatively, antenna panels may support radio frequency beamforming of signals transmitted via antenna ports.

[0072] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape or guide antenna beams (e.g., transmit beams, receive beams) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating relative to a particular orientation of the antenna array are subject to constructive interference, while others are subject to destructive interference. The adjustment of signals transmitted via antenna elements can include the transmitting or receiving device applying amplitude shift, phase shift, or both to the signals carried by the antenna elements associated with that device. The adjustment associated with each antenna element can be defined by a set of beamforming weights associated with a particular orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other direction).

[0073] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer can perform priority processing and multiplexing logical channels to transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both, to support retransmission at the MAC layer, thereby improving link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and the base station 105 or core network 130 to support the radio bearer of user plane data. At the physical layer, transport channels can be mapped to physical channels.

[0074] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correct data reception on communication link 125. HARQ can include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), Forward Error Correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under adverse radio conditions (e.g., low signal-to-noise ratio conditions). In some aspects, the equipment can support same-slot HARQ feedback, where the equipment can provide HARQ feedback for data received in a previous symbol within a specific time slot. In other cases, the equipment can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0075] To support robust sidelink channel access for the wireless communication system 100, the wireless communication system 100 can implement subchannel-based occupancy time sharing for unlicensed sidelinks. In one aspect, the UE 115 can use the LBT procedure to obtain access to the shared channel bandwidth from the COT. In some cases, the UE 115 can determine a portion of the channel resources to share with other UEs 115 for (e.g., on D2D communication link 135) sidelink transmissions. In some aspects, these UEs 115 can be examples of vehicles communicating in a V2X system. The sharing provider UE 115 can send a sharing indicator indicating a portion of the shared channel bandwidth resources of the COT. In one aspect, the sharing provider UE 115 can send a TDM sharing indicator to share a portion of the COT's time resources, send an FDM sharing indicator to share a portion of the shared channel bandwidth's frequency resources, or some combination thereof. The sharing receiver UE 115 can receive a sharing indicator that identifies it as a valid COT sharing indicator for the sharing receiver UE 115, (e.g., based on one or more parameters of sharing), use a channel access procedure to obtain access to the shared resource, and (e.g., in a COT occupied by the sharing provider UE 115) transmit sidelink data in the shared resource.

[0076] Specifically, UE 115 can utilize a set of sub-bands configured for transmitting COT sharing indicators. The set of sub-bands can be pre-configured, semi-statically configured, or dynamically configured to transmit resource pools on unlicensed frequency bands. The sharing receiver UE 115 can receive the COT sharing indicator (e.g., by monitoring the configured set of sub-bands) and can access one or more sidelink sub-channels during the COT using the indicated LBT variant (e.g., a Type 2 LBT variant). In some aspects, the sharing receiver UE 115 can access licensed resources for the sidelink sub-channels. In other aspects, the sharing receiver UE 115 can selectively access resources for the sidelink sub-channels. UE 115 can access one or more sub-channels for a specific duration (e.g., a specific number of symbols or time slots) shared by the COT sharing indicator. By using the accessed resources, UE 115 can transmit one or more sidelink data messages in the COT based on the COT sharing procedure.

[0077] Therefore, sharing the receiver UE 115 can reduce the latency involved in accessing the side walkway channel and improve the resource utilization of the side walkway channel (e.g., compared to UE 115 waiting to transmit on the side walkway channel until it gains access to occupy its own COT). Furthermore, COT sharing can provide robustness against other interference sources (such as Wi-Fi nodes) and can enable some low-complexity UE 115s to gain access to unlicensed side walkway channel resources without performing Type 1 LBT.

[0078] Figure 2 An example of a wireless communication system 200 supporting unlicensed side crosslinks based on subchannel occupancy time sharing is shown. The wireless communication system 200 may include, for reference only. Figure 1 Examples of UE 115 described are UE 115-a, 115-b, and 115-c. UE 115-a, 115-b, and 115-c can support sidelink communication. The wireless communication system 200 may also include one or more nodes 205 (e.g., Wi-Fi nodes). Node 205 may be a reference... Figure 1An example of a base station 105 is described. Additionally or alternatively, node 205 may be an example of another wireless device in the wireless communication system 200. In some aspects, node 205 may act as a "hidden node" for one or more UEs 115. In one aspect, node 205 may be a hidden node for UE 115-a communicating with UE 115-b, because UE 115-a may be unable to detect signals from node 205 that could interfere with communication with UE 115-b (e.g., UE 115-a may be outside the coverage area 210 of node 205). In some cases, UE 115 (such as UE 115-c) may be configured to share COT sharing information with other UEs 115 (such as UE 115-a and UE 115-b) via COT sharing indicator 220. This COT sharing technique can mitigate the negative impact of hidden nodes in the wireless communication system 200.

[0079] In some wireless communication systems 200 (e.g., NR systems), two or more devices (e.g., UEs 115-a, 115-b, and 115-c) can communicate with each other using sidelink signal 215. UE 115 can implement sidelink communication to support public safety communications, proximity services, UE-to-network message forwarding, V2V or V2X communications, Internet of Things (IoE) communications, IoT communications, Mesh applications, or any combination of these or various other suitable applications. Sidelink signal 215 can be sent from one subordinate entity to another (e.g., from one UE 115 to another UE 115) without traversing a scheduling entity (e.g., as referenced). Figure 1 The described base station 105 forwards communications. In some cases, the scheduling entity can provide scheduling information for the sidelink signal 215 transmitted between subordinate entities. In some aspects, the sidelink signal 215 can communicate using Intelligent Transportation System (ITS) bands or licensed bands. In the wireless communication system 200, UE 115-a, UE 115-b, and / or UE 115-c can communicate using the sidelink signal via shared (e.g., unlicensed) bands. In some aspects, the wireless communication system 200 can support enhanced mobile broadband (eMBB) and URLLC in unlicensed sidelinks (e.g., 5 GHz unlicensed band, 6 GHz unlicensed band, or any other unlicensed band).

[0080] UE 115 may use one or more modes of Radio Resource Allocation (RRA) to identify resources for transmitting sidelink signals 215. A first mode (e.g., mode 1) may involve network-controlled RRA. In some aspects, UE 115 may receive a grant for sidelink channel access from a network entity (e.g., base station 105). In some cases, the grant may be received using downlink control information (DCI) (e.g., DCI 3-0 format or another DCI format). A second mode of RRA (e.g., mode 2) may involve autonomous RRA for UE 115. In some aspects, UE 115 may select and / or reserve sidelink channel access by monitoring (e.g., sensing) the channel. If the channel is clear for a specific duration during sensing, UE 115 may obtain access to the channel. The sidelink channel may include PSCCH, PSSCH, or a combination thereof. PSCCH may carry SCI. SCI may include a phase-one SCI (SCI 1), a phase-two SCI (SCI 2), or both. The PSSCH can carry sidelink data and / or SCI 2 (e.g., SCI 2 can be multiplexed with sidelink data). SCIs can be preloaded in a time slot (e.g., transmitted in the first half of the time slot or in the first set of symbols). Additionally or alternatively, the sidelink channel may include the Physical Sidelink Feedback Channel (PSFCH).

[0081] In some respects, devices in wireless communication system 200 (e.g., UEs 115-a, 115-b, 115-c, or node 205) can retain the occupancy time of unlicensed channel access based on the successful completion of the LBT procedure. The device can sign off the COT of channel access in order to transmit data, share channel resources with another device, or both. UE 115 can perform the LBT procedure and can receive the sign-off time for the occupied unlicensed side walkway channel. UE 115 can configure the sign-off time based on the CAPC used during the LBT procedure, the ED threshold used during the LBT procedure, or both. In one respect, a lower CAPC (e.g., including more delayed slots) can correspond to an earlier allowed sign-off time. Similarly, a lower ED threshold (e.g., indicating that the channel is relatively interference-free over a larger area) can correspond to an earlier allowed sign-off time. In some respects, different UEs 115 can be configured with different sign-off times (e.g., based on CAPC, ED threshold, or a combination thereof). Therefore, different UEs 115 can be configured to send COT sharing indicators 220 with different priorities via different Type 1 LBT checkout times in the same subchannel. In one aspect, UE 115-c can announce the COT sharing indicator 220 before UE 115-a can announce another COT sharing indicator 220 in the same subchannel. The earlier allow checkout time can support additional channel sharing opportunities.

[0082] UE 115, having obtained access to the shared channel bandwidth of the COT, can transmit sidelink transmissions 215 on the channel. Additionally or alternatively, as described herein, UE 115 can act as a COT sharing provider and can provide one or more COT sharing indicators 220 to one or more other UEs 115. In one aspect, UE 115-c can access the COT and can use the COT sharing indicator 220 to share COT resources with UE 115-b. UE 115-b can use the COT sharing indicator 220 received from UE 115-c to obtain partial access to the shared channel bandwidth of the COT and can transmit sidelink signals 215 in the shared resources. In some cases, UE 115 can be configured for COT sharing by a centralized scheduler (e.g., based on an authorization received from base station 105 including COT sharing information). In one respect, UE 115 can receive from base station 105 a dedicated radio resource control (RRC) message (e.g., a Class 1 configuration grant (CG) or similar configuration message), a DCI message for activation and a dedicated RRC message (e.g., a Class 2 CG or similar configuration message), a DCI message for a one-time COT sharing indicator 220, or a combination thereof, thereby configuring UE 115 to perform COT sharing (e.g., configuring COT sharing indicator 220 to UE 115, a window for sending COT sharing indicator 220, or both). In another respect, UE 115 can report back to base station 105 whether UE 115 successfully sent COT sharing indicator 220 within a specified window (such as within a Physical Uplink Control Channel (PUCCH) resource configured by RRC or DCI messages). In some respects, UE 115 can (e.g., by monitoring the PSFCH used for feedback messages that confirm successful transmission of sidelink data on the shared channel bandwidth) indicate in Layer 2 (L2) or Layer 3 (L3) signaling whether a collision has occurred on the shared channel bandwidth. Additionally or alternatively, UE 115 can determine autonomously whether to share COT resources (e.g., UE 115 can obtain access to the COT and autonomously share COT resources with other UE 115s).

[0083] The COT sharing receiver UE 115 can monitor the COT sharing indicator 220 to improve the likelihood of the COT sharing receiver UE 115 gaining access to the shared channel resources. In some aspects, the window used to search for the COT sharing indicator 220, the COT sharing indicator 220 itself, or both can be semi-statically configured. The COT sharing provider UE 115 can transmit the COT sharing indicator 220 in a corresponding resource set (e.g., a monitoring window). The COT sharing receiver UE 115 can monitor the COT sharing indicator 220 in a resource set (e.g., a configured monitoring window). In some aspects, the base station 105 can use System Information Block (SIB)X (e.g., SIB 1, SIB 2, etc.), dedicated RRC configuration, DCI messages, or some other configuration signaling to configure a window for the UE 115 (e.g., when the UE 115 operates according to RRA mode 1). In some other aspects, the UE 115 can be pre-configured with a window (e.g., when operating according to RRA mode 2). Additionally or alternatively, the window can be dynamically determined. In one aspect, UE 115 in network-controlled RRA mode (e.g., mode 1) can receive COT sharing indicator 220 and a corresponding window for transmitting COT sharing indicator 220 via DCI.

[0084] Each UE 115 attempting to access a shared side link channel can be configured to check the COT sharing indicator 220. In one aspect, UE 115-b can be configured to search for one or more COT sharing indicators 220 in one or more windows (e.g., a set of time resources, frequency resources, beamforming resources, or combinations thereof). In some cases, the windows can be predefined or configured (e.g., as described herein). The COT sharing indicator 220 received in the window can indicate the type of LBT procedure (e.g., Type 1 LBT, Type 2 LBT, no LBT, etc.) used by UE 115-b to obtain access to the shared resource of the COT. A Type 1 LBT can correspond to a “full” LBT procedure and can involve a longer contention window for the monitoring channel than a Type 2 LBT. In some aspects, the COT sharing indicator 220 can indicate that UE 115-b can avoid channel sensing before accessing the channel (e.g., by using a Type 2C LBT for a time less than a threshold duration, such as 584 microseconds (μs)). In one respect, avoiding channel induction before access to the channel can be adapted to a time slot in which the subcarrier spacing (SCS) is at least equal to a threshold (e.g., 30 kHz).

[0085] In some respects, the COT sharing indicator 220 may specify which UEs 115 can share the indicated resources based on a distance threshold, interleaving type, or both. In one respect, the COT sharing indicator 220 may share COT with UEs 115 located within a distance threshold from the location of the COT sharing provider UE 115 (e.g., the COT sharing receiver UE 115 may be within the same coverage area 210 as the COT sharing provider UE 115, within the same area identifier (ID) as the COT sharing provider UE 115, or within a threshold radio frequency (RF) distance from the COT sharing provider UE 115). Additionally or alternatively, the COT sharing indicator 220 may share COT with UEs 115 using a specific set of subchannel interleaving (e.g., the COT sharing receiver UE 115 may use a set of interleavings for mitigating interference to subcarriers used by the COT sharing provider UE 115).

[0086] Alternatively or additionally, the COT sharing indicator 220 may include timing information corresponding to the type of LBT procedure. In some aspects, the COT sharing indicator 220 may indicate the cyclic prefix (CP) extension, CAPC or time slot, resource or subchannel for which the indicated LBT procedure (e.g., one-time LBT) can be performed by the UE 115. Alternatively or additionally, the COT sharing indicator 220 may indicate an ED threshold. The COT sharing indicator 220 may be in the form of control information and may be protected by cyclic redundancy check (CRC). In some cases, each COT sharing indicator 220 may have a unique identifier (ID). In some aspects, one or more of these parameters for COT sharing may be explicitly indicated (e.g., received in a dynamic monitoring window) as the content of the COT sharing indicator 220. Alternatively or additionally, one or more of these parameters may be implicitly indicated based on the window in which the COT sharing indicator 220 is sent and received (e.g., in a fixed or semi-static monitoring window). Therefore, the COT sharing receiver UE 115 (e.g., UE 115-b) that receives the COT sharing indicator 220 in the resource set can determine the sharing information of the COT based on the COT sharing indicator 220, the resource set, or a combination thereof, and can determine how to obtain access to the shared COT resources.

[0087] COT sharing provider UE 115 (e.g., UE 115-a) can support contention window management. A successful LBT procedure (e.g., for obtaining access to the COT, for obtaining access to shared COT resources, etc.) may involve UE 115 sensing the channel within the contention window. If the channel is free during the duration of the contention window (e.g., the energy level detected by UE 115 on the channel is below the ED threshold), UE 115 can transmit on the shared channel (e.g., in some cases, using occupancy signals to occupy the channel before sidelink transmission). UE 115 can manage one or more contention windows (e.g., for competing for the COT, for allowing COT sharing receiver UE 115 to compete for shared COT resources, or both). In some respects, the length of the contention window can be fixed. In one respect, UE 115 can receive an indication of a contention window configured by SIBX (e.g., SIB1, SIB2, etc.), RRC messages, DCI messages, or some other configuration signaling. In another respect, UE 115 can be pre-configured with a contention window. In some cases, UE 115 can implement a fixed contention window for transport pools of resources that do not support the corresponding feedback message on PSFCH.

[0088] In some respects, the COT sharing provider UE 115 can configure the contention window length based on the channel occupancy rate (CBR) of the sidelink channel. In one respect, the UE 115 can measure the CBR and implement a corresponding contention window based on the measured CBR. In some cases, the UE 115 can be configured with a series of contention windows and a lookup table (e.g., from SIBX, pre-configured, RRC configured, etc.) that the UE 115 can use to map the measured CBR to the corresponding contention window length. Additionally or alternatively, the contention window can be modified based on the PSFCH (e.g., a transport pool for resources supporting corresponding feedback messages on the PSFCH). In one respect, the COT sharing provider UE 115 can monitor one or more PSFCHs corresponding to one or more potential COT sharing receiver UEs 115 to update the contention window. The COT sharing provider UE 115 can receive feedback messages from one or more UEs 115 on the PSFCH and can determine message conflicts in portions of the COT and / or portions of the time-frequency resources based on the receipt of negative (NACK) feedback. The COT sharing provider can modify the duration of the corresponding contention window based on information in one or more PSFCHs, the conflict rate, the COT sharing mode (e.g., FDM COT sharing or TDM COT sharing), or some combination thereof.

[0089] In one respect, the COT sharing provider UE 115 can operate in half-duplex mode. Therefore, the COT sharing provider UE 115 can implement TDM COT sharing to support receiving sidelink data messages from the COT sharing receiver UE 115 (e.g., because in an FDM sharing scheme, a half-duplex UE 115 may not support receiving sidelink messages concurrently with sending sidelink messages). In another respect, the COT sharing provider UE 115 can implement a TDM COT sharing indicator to receive feedback messages on one or more PSFCHs in a TDM shared resource. Alternatively or additionally, the half-duplex UE 115 can avoid implementing FDM COT sharing, or it can implement both FDM COT sharing and TDM COT sharing to ensure support for receiving messages in shared resources. The COT sharing provider UE 115 can configure the half-duplex COT sharing indicator 220 based on the capabilities of the COT sharing provider UE 115.

[0090] Some sidelink communications can be synchronous (e.g., they can follow the same frame or time slot timing). In some respects, UE 115 can perform LBT procedures on a sidelink channel that can be defined at periodic intervals (e.g., using a fixed-start LBT). Specifically, UE 115 operating under a fixed-start LBT can attempt to gain access to the channel at or slightly before the time slot boundary of an unlicensed sidelink channel. In other respects, some sidelink LBT procedures can be performed asynchronously (e.g., using a floating-point LBT procedure). Some nodes 205 (e.g., Wi-Fi node 205) can perform floating-point LBT procedures, which may cause frequent interruptions for UE 115 using a fixed-start LBT procedure to access the channel. That is, a node 205 performing a floating-point LBT procedure may have significantly more opportunities to gain access to the channel than a UE 115 performing a fixed-start LBT, making it possible for a UE 115 performing a fixed-start LBT to be exhausted by node 205 sharing the channel access. In some respects, one or more UEs 115 can perform floating-point LBT to obtain access to the channel at any point within a time slot (e.g., not limited to time slot boundaries). Additionally or alternatively, UE 115 can operate as a COT sharing provider UE 115 (e.g., UE115-c) to assist other UEs 115 in obtaining access to unlicensed side walkway resources.

[0091] By providing the COT sharing indicator 220, UE 115 can mitigate the impact of interference from other nodes 205 that can use the floating-point LBT procedure. (Reference) Figure 2UEs 115-b and 115-c may be located within the coverage area 210 of node 205. When UE 115-a communicates with UE 115-b, the sidelink signal 215 may be subject to interference transmitted by node 205 (e.g., a hidden node of UE 115-a) near UE 115-b. In some respects, UE 115-c may obtain access to COT and may share the COT sharing indicator 220 with UE 115-b, which may provide more reliable transmission of sidelink data 215 from UE 115-a to UE 115-b (e.g., reducing the likelihood of interference from hidden node 205). In some respects, UE 115-b may identify UE 115-c as a COT sharing source of UE 115-b based on a unique COT sharing ID associated with UE 115-c, location information of UE 115-b and UE 115-c, or some combination thereof. UE 115-b can share the COT sharing ID associated with COT sharing provider UE 115-c with UE 115-a. UE 115-a can use the COT sharing ID to determine if UE 115-c provides shelter for UE 115-b against hidden nodes. In some respects, UE 115-a can detect the COT sharing indicator 220 from UE 115-c and can determine the shared resources (e.g., FDM shared resources of the COT) used for sidelink transmission 215 to UE 115-b. In other respects, UE 115-a can determine the COT sharing (e.g., FDM COT sharing) from UE 115-c based on configuration (e.g., SIBX configuration, pre-configuration, etc.). By sharing the COT resources occupied by UE 115-c, UE 115-a can (e.g., by reducing potential interference from node 205) more reliably transmit sidelink data 215 to UE 115-b. In one respect, node 205 can be left unhidden from UE 115-c and can avoid transmitting on the shared channel when UE 115-c has already gained access and occupied the shared channel.

[0092] UE 115 can use TDM, FDM, or a combination of both to share COT resources with other UE 115s. As described herein, a UE 115 configured as a COT sharing provider can provide robustness against interference sources and signaling protection to reduce interference from hidden nodes 205 (e.g., Wi-Fi nodes) by providing COT sharing information to other UEs 115 via COT sharing indicator 220. The COT sharing information can indicate the available COT resources and LBT type for obtaining channel access.

[0093] Figure 3An example of a subchannel 310 supporting unlicensed side walkway based on subchannel occupancy time sharing is shown according to various aspects of this disclosure. In one aspect, subchannel 310 may support TDM-based COT sharing. Subchannel 310 may be an interlaced (e.g., frequency-interleaved) subchannel and may include one or more time slots 320. Time slot 320 may include several symbols 325, such as OFDM or DFT-S-OFDM symbols. In some aspects, a radio device may monitor multiple symbols on subchannel 310 to perform an LBT procedure. As described herein, UE 115 (such as reference...) Figure 1 and 2 The UE115 described can perform an LBT procedure to obtain access to the shared channel bandwidth of COT, including sub-channel 310.

[0094] In some aspects, UE 115 may determine LBT completion indication 305 in a symbol after the LBT procedure is successfully completed (e.g., LBT completion indication 305 may be determined in symbol 6 of time slot 320 based on sensing channels for one or more of symbols 0 to 5). After successfully contending for subchannel 310 based on LBT completion indication 305, UE 115 may transmit signals on subchannel 310. In some cases, UE 115 may transmit TDM COT sharing information 340 after LBT completion indication 305. In some aspects, TDM COT sharing information 340 may be transmitted in a symbol after prefiller 330. Prefiller 330 may be an example of a occupancy signal, which is transmitted so that UE 115 can occupy subchannel 310 after successful LBT completion. In one aspect, prefiller 330 may include a partial repetition of control information having TDM COT sharing information 340. Additionally or alternatively, after TDM COT sharing information 340, there may be postfiller 335. The postfiller 335 can be an example of a occupied signal and can reduce COT pollution (e.g., between non-shared and shared resources, between time slots 320, etc.).

[0095] In some cases, interference may occur in the COT. Interference can be mitigated by including an optional post-filler 335, a pre-filler 330, or both. The post-filler 335 may be transmitted in sub-channel 310 after the TDM COT sharing information 340, and the pre-filler 330 may be transmitted in one or more symbols before the TDM COT sharing information 340 (e.g., based on the time when UE 115 obtains access to sub-channel 310). The pre-filler 330 can provide an opportunity for UE 115 attempting to obtain channel access by receiving the TDM COT sharing information 340, thereby improving its signal-to-interference-to-noise ratio (SINR) through an opportunity chase combining between the pre-filler 330 and the TDM COT sharing information 340. In one aspect, the chase combining can combine the TDM COT sharing information 340 with partially repeated TDM COT sharing information 340 in the pre-filler 330. This chase combining can improve the reliability of decoding the TDM COT sharing information 340.

[0096] Sub-channel 310 can be referenced as follows Figure 1 and Figure 2 The described UE 115 is used for sidelink communication. In some cases, UE 115 may occupy a 20 MHz bandwidth for sidelink transmission based on an Occupied Channel Bandwidth (OCB) threshold, a Power Spectral Density (PSD) threshold, or a combination thereof. UE 115 configured as a COT sharing provider may provide TDM COT sharing information 340 to other UE 115s via subchannel 310. TDM COT sharing information 340 may be transmitted via subchannel 310 in the form of control information. TDM COT sharing information 340 may provide an indication of COT availability for channel access. In some aspects, the COT sharing provider may send TDM COT sharing information 340 to indicate that remaining COT resources (e.g., subsequent symbols 325, time slots 320, etc.) are available for sharing. In some other aspects, TDM COT sharing information 340 may (e.g., by indicating a time slot index, symbol index, time slot counter, or a combination thereof) indicate specific time resources for sharing. UE 115, operating as a COT sharing receiver, can use the COT sharing indicator received via TDM COT sharing information 340 to access portions of the available COT (e.g., for sending sidelink data, further sharing COT, etc.).

[0097] TDM COT sharing information 340 can be transmitted in symbols relatively close to the end of time slot 320 to provide space for the LBT process in time slot 320. In one aspect, TDM COT sharing information 340 can be transmitted in symbols 10, 11, and 12 within time slot 320. In some aspects, TDM COT sharing information 340 can be transmitted at a fixed location within time slot 320 (e.g., back-load at a hard-coded fixed location). TDM COT sharing information 340 can use symbol 325 positioned after receiving LBT completion indication 305.

[0098] As described herein, UE 115 can obtain access to COT and can indicate subsequent resources (e.g., symbol time period, time slot 320, or some other time period) available for COT sharing by other UE 115 via TDM COT sharing information 340. In some aspects, indicating symbol 325 or time slot 320 as available TDM resources can allow UE 115 that may be attempting to obtain channel access to use the available symbol 325 or time slot 320 for sidelink communication. Subsequently, the indicated symbol 325 or time slot 320 may not be available for sidelink transmissions by the COT sharing provider. In some aspects, UE 115 can use COT to perform one or more sidelink transmissions (e.g., based on information queued in UE 115's buffer) before sharing remaining resources (e.g., on all subchannels of the occupied shared channel bandwidth) with other UE 115 via TDM COT sharing information 340. The COT sharing provider can stop transmissions in the TDM shared resources of COT (e.g., avoid transmission). Additionally or alternatively, UE 115 may send TDM COT sharing information 340 and may indicate that UE 115 may stop sharing available COT time with other UE 115 (e.g., symbol 325 or time slot 320) (e.g., UE 115 may share symbols 0 to 5 of time slot 320, may relinquish the resources for sharing available COT at symbol 5, and may use symbols 6 to 13 for sidelink transmission).

[0099] Figure 4 An example of a subchannel 410 supporting unlicensed side link occupancy time sharing according to various aspects of this disclosure is shown. In one aspect, subchannel 410 may support FDM-based COT sharing. Subchannel 410 may be an interleaved (e.g., frequency-interleaved) subchannel and may include, as referenced... Figure 3One or more time slots 420 are described. A time slot 420 may include several symbols (such as OFDM or DFT-S-OFDM symbols), and a subchannel may include several frequency resources (e.g., resource blocks). In some aspects, UE 115 (such as reference) Figures 1 to 3 The described UE 115 can perform an LBT procedure and can determine an LBT completion indication 405 in time slot 420-a to obtain access to the shared channel bandwidth of COT 460, including sub-channel 410. In some aspects, sub-channel 410 may include one or more gaps 465 (e.g., gaps 465-a, 465-b, and 465-c) in signaling at each time slot boundary between time slots 420. One or more time slots 420 in COT 460 may include SCI 455 (e.g., SCI 1, SCI 2, or a combination thereof) in sidelink control resources 440. Each SCI 455 may include a pointer 415 linked to a location in the sidelink data resource 445 that transmits FDM COT sharing information 450. In some cases, TDM COT sharing information may be in a manner similar to... Figure 4 The FDM COT sharing information 450 is transmitted in the manner shown. Alternatively or additionally, the FDM COT sharing information 450 can be transmitted in a manner similar to... Figure 3 The TDM COT sharing information method shown is used for sending.

[0100] Sub-channel 410 can be used as reference Figure 1 and Figure 2 The description pertains to sidelink communication of UE 115. UE 115 configured as a COT sharing provider can provide FDM COT sharing information 450 to other UE 115 via subchannel 410. In some aspects, the FDM COT sharing information 450 can be transmitted via subchannel 410 in the form of control information (e.g., SCI 1, SCI 2, or any other sidelink control information). Additionally or alternatively, the FDM COT sharing information 450 can be transmitted via sidelink data resource 445. In some aspects, the COT sharing provider can indicate a portion of the available FDM resources of COT 460 to other UE 115 via the FDM COT sharing information 450. The COT sharing provider can transmit additional signals in the remaining portion of the available resources of COT 460. The available FDM COT sharing information 450 can be indicated by pointers 415 (e.g., pointers 415-a, 415-b, and 415-c). Pointer 415 can be linked from SCI 455 (e.g., SCI 1) to a location (e.g., one or more resources) in side link data resources 445 that include (e.g., in SCI 2) FDM COT sharing information 450.

[0101] In some cases, interference may occur in subchannel 410. Interference can be reduced by including one or more gaps 465 (e.g., 16 μs gaps) between time slots 420. In one aspect, gap 465-a can reduce interference between time slots 420-b and 420-c. Additionally or alternatively, prefiller 430 may be transmitted in one or more symbols and / or frequency resources of subchannel 410. Prefiller 430 may include an occupancy signal and may be transmitted in one or more symbols after LBT completion indication 405 and before sidelink control or sidelink data transmission. In some aspects, prefiller 430 may support chase combination with FDM COT shared information 450 to improve decoding of FDM COT shared information 450.

[0102] In some respects, FDM COT sharing information 450 may be transmitted at a fixed location within time slot 420 (e.g., reloaded at a fixed location within the time slot). FDM COT sharing information 450 may be located in a symbol relatively close to the end of time slot 420. Additionally or alternatively, FDM COT sharing information 450 may be transmitted using sidelink data resource 445, or may be multiplexed with sidelink data resource 445. Time slot 420 may include SCI 455 (e.g., SCI 1 and / or SCI 2). SCI 455 may include pointer 415 (e.g., pointer 415-c may be associated with SCI 455 in time slot 420-d). SCI 455 and the associated pointer 415 may point to FDM COT sharing information 450. In one aspect, time slot 420-b may include pointer 415-a, which may point to control information (e.g., SCI 2) in a sideline data resource 445 that may include FDM COT sharing information 450. Similarly, time slot 420-c may include pointer 415-b, and time slot 420-d may include pointer 415-c.

[0103] A UE 115 configured as a COT sharing provider can provide FDM COT sharing information 450 to other UEs 115 via sub-channel 410. UE 115 can read the indication of FDM COT sharing information 450 in time slot 420 and can use COT in time slot 420 or subsequent time slots. In one aspect, UE 115 can read FDM COT sharing information 450 in time slot 420-c and can access sub-channel 410 in time slot 420-d to transmit in the available FDM resources of COT 460. FDM COT sharing information 450 can specify multiple frequency resources, multiple sub-channels 410, or combinations thereof, for FDM sharing. In some aspects, the COT sharing provider can share a first set of frequency resources with other UEs 115 in time slot 420 while maintaining a second set of frequency resources in time slot 420 for sidelink transmissions performed by the COT sharing provider. In this way, the COT sharing provider can concurrently send sidelink data messages with one or more sidelink data transmissions performed by the COT sharing receiver within COT 460. Specifically, the COT sharing receiver UE 115 can receive the FDMCOT sharing indicator in time slot n and can compete for a portion of the shared COT resources in subsequent time slot n+1 (e.g., using a Type 2B LBT, a Type 2C LBT, or any other channel access procedure).

[0104] As described herein, UE 115 can be configured as a COT sharing provider and can provide FDM COT sharing information 450 in subchannel 410 to share a portion of the available resources of subchannel 410 of COT 460 with other UEs 115. The COT sharing provider can continue to use the remaining portion of subchannel 410 for other sidelink transmissions while providing FDM sharing of COT resources.

[0105] Figure 5 An example of a subchannel 510 supporting unlicensed side crosslink based on subchannel occupancy time sharing is shown according to various aspects of this disclosure. In one aspect, subchannel 510 may support a combination of FDM-side crosslink COT sharing and TDM-side crosslink COT sharing. Subchannel 510 may be an interleaved (e.g., frequency-interleaved) subchannel and may include one or more time slots 520. Time slot 520 may include TDM COT sharing information 550, FDM COT sharing information 555, or both. In one aspect, time slot 520-a may include TDM COT sharing information 550 and may be a reference... Figure 3 An example of time slot 320. Time slot 520-b may include FDM COT sharing information 555 located in side link data resource 545, and may be a reference Figure 4Example of time slot 420. Subchannel 510 may include, as a reference Figure 3 Examples of pre-filler 330 and post-filler 335 described include one or more pre-fillers 530 and / or post-fillers 535. Additionally or alternatively, subchannel 510 may include several signaling gaps 565 between time slots 520. Upon determining LBT completion indication 505, UE115 may perform an LBT procedure to obtain COT 570 access to subchannel 510.

[0106] Subchannel 510 may include one or more time slots 520 having FDM COT sharing information 555 and / or one or more time slots 520 having TDM COT sharing information 550. (See reference) Figure 5 Subchannel 510 may include time slots 520-a and 520-c with TDM COT sharing information 550, and may include time slot 520-b with FDMCOT sharing information 555 located in side link data resource 545. The TDM COT sharing information 550 in time slots 520-a and 520-c may indicate available COT 570 resources (e.g., indicating TDM COT sharing of resources starting in time slot 520-d) via TDM COT sharing indicators 575-a and 575-b, respectively. In some aspects, the COT sharing provider may send a single instance of TDM COT sharing information 550, or may send multiple instances of TDM COT sharing information 550 (e.g., such as...). Figure 5 (As shown, this is used to improve redundancy to support power saving, or both). One or more TDM COT sharing indicators 575 can provide an early indication of available COT resources, which can provide options for reducing power used at one or more UEs 115. In one aspect, TDM COT sharing indicator 575-a can provide an indication of the available resources of COT 570 at an earlier time than TDM COT sharing indicator 575-b. A UE 115 attempting to access COT 570 can read the earlier TDM COT sharing indicator 575-a and can determine to enter a power saving mode based on the indication (e.g., UE 115 can detect TDM COT sharing indicator 575-a in time slot 520-a and can enter a micro-sleep mode during time slots 520-b and 520-c to save power until the TDM COT shared resources are available in the indicated time slot 520-d).

[0107] As described herein, a UE 115 configured as a COT sharing provider can provide one or more of TDM COT sharing information 550 and FDM COT sharing information 555 via subchannel 510. TDM COT sharing information 550 and / or FDM COT sharing information 555 can indicate portions (e.g., FDM resources, TDM resources, or a combination thereof) of available resources in COT 570 for sharing with other UEs 115. In some aspects, the COT sharing provider can send a combination of TDM COT sharing information 550 and FDM COT sharing information 555 to efficiently allocate available resources of COT 570 (e.g., frequency resources, time resources, or both) for sidelink transmissions. In one aspect, UE 115 can acquire COT 570 and can share portions of available COT 570 in timeslot 520-d with other UEs 115 by using TDM COT sharing information 550. Alternatively or additionally, UE 115 may use FDM COT sharing information 555 (e.g., indicated by pointer 515 in SCI 560 transmitted in sidelink control resource 540) to indicate the portion of frequency resources available for sharing in time slot 520-c. UE 115 may use the remaining portion of the frequency resources available in time slot 520-c for sidelink data transmission. Sharing COT information by sharing available FDM and TDM resources can improve the utilization of available resources in COT 570.

[0108] Figure 6 An example of a process flow 600 supporting subchannel-based occupancy time sharing for an unlicensed side link is shown according to various aspects of this disclosure. In some cases, process flow 600 can be implemented as described in the reference. Figure 1 and Figure 2 The description includes aspects of wireless communication systems 100 or 200. In one aspect, UE115-d and UE115-e (which may be referenced) Figure 1 and 2 The example described for the device can communicate on the unlicensed side link channel. In some respects, according to the process described herein, UE 115-d can act as a COT sharing provider UE, and UE 115-e can act as a COT sharing receiver UE. The following alternative aspects can be implemented, wherein some steps are performed in a different order than described, or not at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0109] In 605, UE 115-d (e.g., COT sharing provider UE 115) can obtain access to the shared channel bandwidth for a duration of time (e.g., COT) based on a channel access procedure. In one aspect, UE 115-d can perform an LBT procedure (e.g., a Type 1 LBT procedure) and determine (e.g., receive) an LBT completion indication to obtain access to the shared channel bandwidth. The shared channel bandwidth may include a set of COT subchannels (e.g., interleaved subchannels).

[0110] In some cases, in 610, UE 115-d may send an occupancy signal based on obtaining access to the shared channel bandwidth before the resource set used to send the sharing indicator (e.g., COT sharing indicator). In some cases, the occupancy signal may be an example of a prefiller. In some aspects, the occupancy signal may include repeated COT sharing information to support chase combining.

[0111] In 615, UE 115-d can support FDM COT sharing. In 620, UE 115-d can identify a resource set (e.g., a window) for transmitting a sharing indicator and can transmit a sidelink control message including the sharing indicator on a sub-channel of shared channel bandwidth. In some respects, the sharing indicator can indicate a portion of FDM sharing that occupies time (e.g., FDM sharing of the first sub-channel supporting shared channel bandwidth).

[0112] In 625, UE 115-e (e.g., COT shared receiver UE 115) can obtain access to the first sub-channel of the shared channel bandwidth based on an FDM sharing indicator. In some cases, UE 115-e can determine whether to obtain access to an FDM shared resource, the FDM shared resource itself, or both, based on a field in the FDM sharing indicator or based on a window (e.g., a resource set) that receives the FDM sharing indicator. Obtaining access to an FDM shared resource can involve a contention window LBT procedure managed by UE 115-d, such as a Type 2 LBT procedure.

[0113] In 630, UE 115-e can transmit sidelink data messages on a first subchannel of the shared channel bandwidth based on obtaining access to the FDM shared resources. In some cases, in 635, UE 115-d can (e.g., in frequency resources not shared by FDMCOT) concurrently transmit sidelink data messages on a second subchannel of the shared channel bandwidth.

[0114] In 640, UE 115-d can support TDM COT sharing. In some respects, for a given COT, the COT sharing provider can implement no COT sharing, FDM COT sharing, TDM COT sharing, or a combination of FDM and TDM COT sharing.

[0115] In 645, UE 115-d can transmit sidelink data messages in the first time slot of the COT (e.g., before TDMCOT sharing). In 650, UE 115-d can identify the resource set used to transmit the sharing indicator and can transmit sidelink control messages including the sharing indicator on a sub-channel of the shared channel bandwidth. In some aspects, the sharing indicator can indicate TDM sharing of a portion of the occupancy time (e.g., TDM sharing of the second time slot of the COT supporting the shared channel bandwidth). In some aspects, in 655, UE 115-d can transmit an occupancy signal (e.g., a post-filler) after completing the transmission of the COT sharing indicator and before the second time slot.

[0116] In 660, UE 115-e can obtain access to the shared channel bandwidth in the second time slot of the COT based on a TDM sharing indicator. In some cases, UE 115-e can determine the process of obtaining access to the TDM shared resource, the TDM shared resource itself, or both, based on fields in the TDM sharing indicator or based on the window (e.g., resource set) that received the TDM sharing indicator. Obtaining access to the TDM shared resource can involve a contention window LBT procedure managed by UE 115-d, such as a Type 2 LBT procedure. In 665, UE 115-e can transmit sidelink data messages in the second time slot of the COT. UE 115-d can (e.g., based on sharing these resources with other UE 115s using TDM technology) avoid transmitting in the second time slot of the COT.

[0117] Figure 7 A block diagram 700 illustrates an apparatus 705 supporting subchannel-based occupancy time sharing on an unlicensed side link according to various aspects of this disclosure. Apparatus 705 may be an example of various aspects of the UE 115 described herein. Apparatus 705 may include a receiver 710, a communications manager 715, and a transmitter 720. Apparatus 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0118] Receiver 710 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to subchannel-based occupancy time sharing with unlicensed side walkways, etc.). The information can be transmitted to other components of device 705. Receiver 710 can be a reference. Figure 10 Examples of various aspects of the transceiver 1020 are described. The receiver 710 can utilize a single antenna or a set of antennas.

[0119] In some implementations, the communication manager 715 may: acquire access to the shared channel bandwidth for a period of time based on a channel access procedure; identify a resource set for transmitting a sharing indicator; transmit a sidelink control message including a sharing indicator on a subchannel of the shared channel bandwidth, the sharing indicator indicating TDM sharing, FDM sharing, or a combination thereof for a portion of the time of time; and communicate during the time of time based on the sharing indicator. In some other implementations, the communication manager 715 may receive a sidelink control message including a sharing indicator from a resource set on a subchannel of the shared channel bandwidth from the UE, determine that the sharing indicator indicates TDM sharing, FDM sharing, or a combination thereof for a portion of the time of time, acquire access to the shared channel bandwidth for a portion of the time of time based on the sharing indicator and a channel access procedure for sharing the time of time, and transmit a sidelink data message during the time of time of time based on the acquired access to the shared channel bandwidth. The communication manager 715 may be an example of various aspects of the communication manager 1010 described herein.

[0120] The actions performed by the communication manager 715 described herein can be implemented to achieve one or more potential advantages. In one aspect, the portion of the shared channel bandwidth during the occupancy period can allow for efficient use of unlicensed sidelink channel resources. Additionally or alternatively, sharing techniques can provide robustness against other interference sources, such as Wi-Fi. In one aspect, if a UE is depleted of channel access by a neighboring node (e.g., a neighboring Wi-Fi node), another UE that successfully obtains channel access can share channel resources with the depleted UE to improve channel access opportunities. This procedure can also reduce communication latency for UEs using shared resources to obtain channel access. Additionally or alternatively, the COT sharing procedure can efficiently protect sidelink communication from hidden node interference. In some aspects, relatively low-complexity UEs (e.g., UEs that do not perform Type 1 LBT) can use sharing indicators and reduced LBT procedures to access sidelink channels.

[0121] Based on the shared occupancy time between the provider UE and the receiving UE, the processor of device 705 (e.g., the processor controlling receiver 710, communication manager 715, transmitter 720, etc.) can reduce processing resources used for sidelink communication. In one aspect, by mitigating hidden node interference, device 705 (e.g., UE 115) can reduce the number of retransmissions performed to successfully transmit sidelink data messages. Reducing the number of sidelink retransmissions reduces the number of times the processor increases processing power and activates processing units to handle sidelink communication. Additionally or alternatively, device 705 can reduce signaling latency for sidelink communication by using a COT sharing indicator to obtain access to shared channel resources.

[0122] The communication manager 715 or its sub-components may be implemented in hardware, processor-executable code (e.g., software or firmware), or any combination thereof. If implemented in processor-executable code, the functionality of the communication manager 715 or its sub-components may be performed by a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0123] The communication manager 715 or its subcomponents may be physically located in different places, including portions distributed to enable functionality to be implemented by one or more physical components at different physical locations. In some aspects, the communication manager 715 or its subcomponents may be separate and distinct components according to various aspects of this disclosure. In some aspects, the communication manager 715 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in this disclosure, or combinations thereof.

[0124] Transmitter 720 can transmit signals generated by other components of device 705. In some respects, transmitter 720 can be co-located with receiver 710 in transceiver module. In one respect, transmitter 720 can be a reference. Figure 10 Examples of various aspects of the transceiver 1020 are described. The transmitter 720 can utilize a single antenna or a set of antennas.

[0125] Figure 8A block diagram 800 illustrates an apparatus 805 supporting subchannel-based occupancy time sharing according to various aspects of this disclosure. Apparatus 805 may be an example of aspects of apparatus 705 or UE 115 described herein. Apparatus 805 may include a receiver 810, a communications manager 815, and a transmitter 850. Apparatus 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0126] Receiver 810 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to subchannel-based occupancy time sharing with unlicensed side walkways, etc.). The information can be transmitted to other components of device 805. Receiver 810 can be a reference. Figure 10 Examples of various aspects of the transceiver 1020 are described. The receiver 810 can utilize a single antenna or a set of antennas.

[0127] Communication manager 815 may be an example of aspects of communication manager 715 described herein. Communication manager 815 may include channel access component 820, resource identifier 825, sharing indicator component 830, communication component 835, sharing type determination component 840, channel sharing component 845, or any combination thereof. Communication manager 815 may be an example of aspects of communication manager 1010 described herein.

[0128] In some implementations, the channel access component 820 can acquire access to the shared channel bandwidth for a specified duration based on the channel access procedure. The resource identifier 825 can identify the set of resources used to transmit a sharing indicator. The sharing indicator component 830 can transmit a sidelink control message including a sharing indicator on a sub-channel of the shared channel bandwidth, the sharing indicator indicating a portion of TDM sharing, a portion of FDM sharing, or a combination thereof, for the specified duration. The communication component 835 can communicate based on the sharing indicator during the specified duration.

[0129] In some other implementations, the sharing indicator component 830 can receive a side-link control message including a sharing indicator from the UE on a sub-channel of the shared channel bandwidth. The sharing type determination component 840 can determine whether the sharing indicator indicates TDM sharing for a portion of the occupancy time, FDM sharing for a portion of the occupancy time, or a combination thereof. The channel access component 820 can obtain access to the shared channel bandwidth for a portion of the occupancy time based on the sharing indicator and a channel access procedure for sharing the occupancy time. The channel sharing component 845 can transmit side-link data messages during the occupancy time portion based on the obtained access to the shared channel bandwidth.

[0130] Transmitter 850 can transmit signals generated by other components of device 805. In some respects, transmitter 850 can be co-located with receiver 810 in transceiver module. In one respect, transmitter 850 can be a reference. Figure 10 Examples of various aspects of the transceiver 1020 are described. The transmitter 850 can utilize a single antenna or a set of antennas.

[0131] Figure 9 A block diagram 900 illustrates a communication manager 905 supporting subchannel-based occupancy time sharing for unlicensed side walkways according to various aspects of this disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, communication manager 815, or communication manager 1010 described herein. The communication manager 905 may include a channel access component 910, a resource identifier 915, a sharing indicator component 920, a communication component 925, an FDM sharing component 930, a TDM sharing component 935, a filler signaling component 940, a sharing indicator configuration component 945, a reporting component 950, a check-out time component 955, a sharing type determination component 960, a channel sharing component 965, a sleep component 970, a hidden node mitigation component 975, a resource monitoring component 980, or any combination thereof. Each of these components may communicate with each other directly or indirectly (e.g., via one or more buses).

[0132] In some implementations, the channel access component 910 may acquire access to the shared channel bandwidth for a specified duration based on the channel access procedure. The resource identifier 915 may identify the set of resources used to transmit a sharing indicator. The sharing indicator component 920 may transmit a sidelink control message including a sharing indicator on a sub-channel of the shared channel bandwidth, the sharing indicator indicating a portion of TDM sharing, a portion of FDM sharing, or a combination thereof, for the specified duration. The communication component 925 may communicate based on the sharing indicator during the specified duration.

[0133] In some aspects, the sharing indicator indicates at least FDM sharing of a first sub-channel with shared channel bandwidth. In some of these aspects, communication may include the FDM sharing component 930 concurrently transmitting sidelink data messages on a second sub-channel with shared channel bandwidth during the occupancy period, in response to a sidelink transmission performed by the UE on the first sub-channel.

[0134] In some respects, the sharing indicator indicates at least TDM sharing of the second time slot of the occupied time. In some such respects, communication may include the TDM sharing component 935 transmitting sidelink data messages in the first time slot of the occupied time preceding the second time slot of the occupied time, and avoiding transmission during the second time slot of the occupied time.

[0135] In some respects, the filler signaling component 940 may send an occupancy signal after the transmission-side link control message is completed and before the second time slot. Alternatively or additionally, the filler signaling component 940 may send an occupancy signal based on obtaining access to the shared channel bandwidth and before the resource set.

[0136] In some aspects, the lateral link control message including the sharing indicator is transmitted in the first time slot of the occupancy time. In some aspects, the sharing indicator indicates a second time slot of the occupancy time so as to share a portion of the occupancy time. In some aspects, the lateral link control message including the sharing indicator is transmitted in the latter half of the first time slot. In some aspects, the transmission of the lateral link control message including the sharing indicator is completed before the last symbol of the first time slot.

[0137] In some respects, the sharing indicator also indicates the LBT type, CAPC, ED threshold, distance threshold, interleaved frequency resource set, device identifier, location information, or a combination thereof, in response to the UE sharing occupancy time.

[0138] The shared indicator configuration component 945 can receive a shared indicator configuration message from the base station indicating a resource set for sending a shared indicator, wherein the resource set is identified based on the shared indicator configuration message, and a side link control message is sent. The reporting component 950 can send a report message to the base station confirming the sending of the side link control message that includes the shared indicator in the resource set.

[0139] In some respects, the reporting component 950 can monitor occupancy periods, resource sets, or conflicts in both on the sidelink feedback channel. In some respects, the reporting component 950 can send reporting messages to the base station based on the monitoring.

[0140] In some aspects, identifying a resource set may include a resource identifier 915 selecting a resource set from multiple resource sets used to send a sharing indicator, wherein a sidelink control message including the sharing indicator is sent in the selected resource set. In some aspects, the resource identifier 915 may identify multiple resource sets based on SIB messages, dedicated RRC messages, DCI messages, pre-configuration, or combinations thereof. In some aspects, a resource set indicates the LBT type, CAPC, ED threshold, or a combination thereof in response to UE sharing occupancy time. In some aspects, a resource set includes a time resource set, a frequency resource set, a beam set, or a combination thereof.

[0141] The checkout time component 955 can determine the earliest checkout time based on the CAPC, ED threshold, or a combination thereof, where the occupancy time portion is based on the earliest checkout time of the occupancy time.

[0142] In some aspects, the channel access procedure may include an LBT (Local Level Bypass) procedure. In some such aspects, the channel access component 910 may perform an LBT procedure for shared channel bandwidth, wherein access to the shared channel bandwidth for the acquired occupancy time is based on the success of the LBT procedure. In some aspects, performing the LBT procedure may include the channel access component 910 monitoring the energy level of the shared channel bandwidth during a contention window asynchronous to the frame timing associated with communication, wherein access to the shared channel bandwidth for the acquired occupancy time is based on the energy level being below an ED (Emergency Delay) threshold for the contention window. In some aspects, the channel access component 910 may determine the duration of the contention window based on SIB messages, RRC messages, DCI messages, pre-configuration, channel occupancy rate, sidelink feedback channel information, collision rate, or combinations thereof.

[0143] In some aspects, the channel access process may include a license-based process. In some such aspects, the channel access component 910 may receive a license for the occupancy time of the shared channel bandwidth from the base station, wherein access to the shared channel bandwidth for the occupancy time is based on the license.

[0144] In some respects, sidelink control messages include SCI 1 messages, SCI 2 messages, time-sharing sidelink control messages, or combinations thereof.

[0145] In some other implementations, the sharing indicator component 920 can receive a sidelink control message including a sharing indicator from the resource set on a subchannel of the shared channel bandwidth from the UE. The sharing type determination component 960 can determine whether the sharing indicator indicates TDM sharing for a portion of the occupancy time, FDM sharing for a portion of the occupancy time, or a combination thereof. The channel access component 910 can obtain access to the shared channel bandwidth for a portion of the occupancy time based on the sharing indicator and a channel access procedure for sharing the occupancy time. The channel sharing component 965 can transmit sidelink data messages during the occupancy time portion based on the obtained access to the shared channel bandwidth.

[0146] In some respects, the sharing indicator indicates at least FDM sharing of the first sub-channel of the shared channel bandwidth. In some of these respects, transmission may include the FDM sharing component 930 concurrently transmitting sidelink data messages on the first sub-channel of the shared channel bandwidth with sidelink transmissions performed by the UE on the second sub-channel of the shared channel bandwidth during the occupancy period.

[0147] In some respects, the sharing indicator indicates at least TDM sharing of the second time slot of the occupied time. In some such respects, transmission may include the TDM sharing component 935 avoiding transmission during the first time slot of the occupied time preceding the second time slot of the occupied time, and transmitting sidelink data messages in the second time slot of the occupied time.

[0148] In some aspects, the channel access procedure for sharing occupancy time includes an LBT (Local Time Bypass) procedure. In some such aspects, the channel access component 910 may perform an LBT procedure for sharing channel bandwidth based on a portion of the occupancy time, wherein access to the shared channel bandwidth for the portion of the occupancy time is based on the success of the LBT procedure. In some aspects, the LBT procedure includes a first LBT procedure corresponding to a first monitoring duration, wherein the first monitoring duration is shorter than a second monitoring duration of a second LBT procedure associated with a contention occupancy time.

[0149] In some respects, transmission may include the channel sharing component 965 transmitting sidelink data messages during a portion of the occupied time without performing a free channel assessment (CCA) of the shared channel bandwidth.

[0150] In some aspects, the lateral link control message including the sharing indicator is received in the first time slot of the occupancy time. In some aspects, the sharing indicator indicates the second time slot of the occupancy time for sharing the portion of the occupancy time. In some aspects, the lateral link control message including the sharing indicator is received in the latter half of the first time slot. In some aspects, the reception of the lateral link control message including the sharing indicator is completed before the last symbol of the first time slot.

[0151] In some respects, the sleep component 970 can enter sleep mode based on receiving a shared indicator in the first time slot of the occupied time, and can exit sleep mode before the second time slot of the occupied time.

[0152] In some respects, the shared indicator component 920 can determine that a shared indicator is a valid shared indicator based on a distance threshold of the shared indicator, an interleaving frequency resource set, or a combination thereof.

[0153] In some respects, the UE is the first UE. In some of these respects, the hidden node mitigation component 975 can receive from the second UE an indication from the first UE that the first UE includes the closest proximate occupancy time shared source of the second UE, and based on the indication from the first UE including the closest proximate occupancy time shared source of the second UE, determine that a sidelink data message will be sent to the second UE during the occupancy time portion. In some respects, the hidden node mitigation component 975 can determine that a hidden node is interfering with one or more transmissions of the second UE, wherein the determination to send a sidelink data message to the second UE during the occupancy time portion is also based on the hidden node.

[0154] In some respects, the sharing indicator also indicates the LBT type, CAPC, ED threshold, UE device identifier, UE location information, or a combination thereof used for sharing occupancy time.

[0155] Resource monitoring component 980 can monitor multiple resource sets with sharing indicators, wherein, based on monitoring, it receives sidelink control messages including sharing indicators in the resource sets of multiple resource sets. In some aspects, resource monitoring component 980 can identify multiple resource sets based on SIB messages, dedicated RRC messages, DCI messages, pre-configuration, or combinations thereof. In some aspects, resource monitoring component 980 can determine the LBT type, CAPC, ED threshold, or combinations thereof for sharing occupancy time based on the resource set. In some aspects, the resource set includes time resource sets, frequency resource sets, beam sets, or combinations thereof.

[0156] In some respects, sidelink control messages include SCI 1 messages, SCI 2 messages, time-sharing sidelink control messages, or combinations thereof.

[0157] Figure 10 A diagram illustrating a system 1000 including device 1005 supporting unlicensed side walkways based on subchannel occupancy time sharing according to various aspects of this disclosure. Device 1005 may be an example of device 705, device 805, or UE 115 described herein, or include components thereof. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may communicate electronically via one or more buses (e.g., bus 1045).

[0158] In some embodiments, the communication manager 1010 may: obtain access to the shared channel bandwidth for a period of time based on a channel access procedure; identify a resource set for transmitting a sharing indicator; transmit a sidelink control message including a sharing indicator on a subchannel of the shared channel bandwidth, wherein the sharing indicator indicates TDM sharing for a portion of the time, FDM sharing for a portion of the time, or a combination thereof; and communicate during the time of time based on the sharing indicator. In some other embodiments, the communication manager 1010 may: receive a sidelink control message including a sharing indicator from a resource set on a subchannel of the shared channel bandwidth from a UE; determine that the sharing indicator indicates TDM sharing for a portion of the time, FDM sharing for a portion of the time, or a combination thereof; obtain access to the shared channel bandwidth for a portion of the time based on the sharing indicator and a channel access procedure for sharing the time of time; and transmit a sidelink data message during the time of time based on obtaining access to the shared channel bandwidth.

[0159] I / O controller 1015 can manage the input and output signals of device 1005. I / O controller 1015 can also manage peripheral devices not integrated into device 1005. In some cases, I / O controller 1015 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1015 can utilize an operating system, such as... Or other known operating systems. In other cases, the I / O controller 1015 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with the device 1005 via the I / O controller 1015 or via hardware components controlled by the I / O controller 1015.

[0160] Transceiver 1020 can communicate bidirectionally via one or more of the aforementioned antennas, wired or wireless links. In one aspect, transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0161] In some cases, a wireless device may include a single antenna 1025. However, in other cases, the device may have more than one antenna 1025 capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0162] Memory 1030 may include random access memory (RAM) and read-only memory (ROM). Memory 1030 may store computer-readable, computer-executable code 1035, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, among others, memory 1030 may contain a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0163] Processor 1040 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, central processing units (CPUs), microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks supporting subchannel-based occupancy time sharing on unlicensed side walkways).

[0164] Code 1035 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 1035 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1035 may not be directly executable by processor 1040, but may (e.g., when compiled and executed) enable the computer to perform the functions described herein.

[0165] Figure 11 A flowchart illustrating a method 1100 for subchannel-based occupancy time sharing supporting an unlicensed side walkway, as described in various aspects of this disclosure, is shown. Operation of method 1100 can be implemented by the UE 115 or its components described herein. In one aspect, operation of method 1100 can be provided by reference to... Figures 7 to 10 The described communication manager performs the functions. In some respects, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Alternatively or additionally, the UE can use dedicated hardware to perform aspects of the functions described below.

[0166] In 1105, the UE can obtain access to the shared channel bandwidth for a specified time based on the channel access procedure. The operation of 1105 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1105 can be obtained from references... Figures 7 to 10 The described channel access component is executed.

[0167] In 1110, the UE can identify the set of resources used to transmit the sharing indicator. The operation of 1110 can be performed according to the methods described herein. In some aspects, various aspects of the operation of 1110 can be derived from references... Figures 7 to 10 The resource identifier described is executed.

[0168] In 1115, the UE can transmit a sidelink control message including a sharing indicator on a sub-channel of shared channel bandwidth. The sharing indicator indicates TDM sharing for a portion of the time, FDM sharing for a portion of the time, or a combination thereof. Operation of 1115 can be performed according to the methods described herein. In some aspects, various aspects of the operation of 1115 can be derived from references... Figures 7 to 10 The shared indicator component described is executed.

[0169] In 1120, the UE can communicate during the occupancy period based on a sharing indicator. The operation of 1120 can be performed according to the methods described herein. In some aspects, various aspects of the operation of 1120 can be referenced. Figures 7 to 10 The described communication component is executed.

[0170] Figure 12 A flowchart illustrating a method 1200 for subchannel-based occupancy time sharing supporting an unlicensed side walkway, as described in various aspects of this disclosure, is shown. Operation of method 1200 can be implemented by the UE 115 or its components described herein. In one aspect, operation of method 1200 can be provided by reference to... Figures 7 to 10 The described communication manager performs the functions. In some respects, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Alternatively or additionally, the UE can use dedicated hardware to perform aspects of the functions described below.

[0171] In 1205, the UE can obtain access to the shared channel bandwidth for the occupied time based on the channel access procedure. The operation of 1205 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1205 can be obtained from references... Figures 7 to 10 The described channel access component is executed.

[0172] In 1210, the UE can identify the set of resources used to transmit the sharing indicator. The operation of 1210 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1210 can be derived from references... Figures 7 to 10 The resource identifier described is executed.

[0173] In 1215, the UE can transmit a sidelink control message including a sharing indicator on a sub-channel of the shared channel bandwidth, the sharing indicator indicating at least FDM sharing of the first sub-channel of the shared channel bandwidth. Operation of 1215 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1215 can be derived from references... Figures 7 to 10 The shared indicator component described is executed.

[0174] In 1220, the UE can concurrently transmit sidelink data messages on a second subchannel sharing the channel bandwidth during the occupancy period, along with sidelink transmissions initiated by the UE on the first subchannel. The operation of 1220 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1220 can be derived from references... Figures 7 to 10 The FDM shared component described is executed.

[0175] Figure 13 A flowchart illustrating a method 1300 for supporting subchannel-based occupancy time sharing on an unlicensed side walkway, according to various aspects of this disclosure, is shown. Operation of method 1300 can be implemented by the UE 115 or its components described herein. In one aspect, operation of method 1300 can be provided by reference to... Figures 7 to 10 The communication manager described herein is executed. In some respects, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Alternatively or additionally, the UE can use dedicated hardware to perform aspects of the functions described below.

[0176] In section 1305, the UE can obtain access to the shared channel bandwidth for a specified time based on the channel access procedure. The operation of section 1305 can be performed according to the method described herein. In some aspects, various aspects of the operation of section 1305 can be obtained from references... Figures 7 to 10 The described channel access component is executed.

[0177] In 1310, the UE can transmit sidelink data messages in the first time slot of the occupancy period preceding the second time slot of the occupancy period. The operation of 1310 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1310 can be obtained from references... Figures 7 to 10 The TDM shared component described is executed.

[0178] In 1315, the UE can identify the set of resources used to transmit the sharing indicator. The operation of 1315 can be performed according to the methods described herein. In some aspects, various aspects of the operation of 1315 can be referenced. Figures 7 to 10 The resource identifier described is executed.

[0179] In 1320, the UE can transmit a sidelink control message including a sharing indicator on a sub-channel of shared channel bandwidth, the sharing indicator indicating at least TDM sharing of the second time slot with occupancy time. Operation of 1320 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1320 can be derived from references... Figures 7 to 10 The shared indicator component described is executed.

[0180] In 1325, the UE can (e.g., based on TDM sharing) avoid transmission during the second time slot of the occupancy period. Operation of 1325 can be performed according to the methods described herein. In some aspects, various aspects of the operation of 1325 can be derived from references... Figures 7 to 10 The TDM shared component described is executed.

[0181] Figure 14 A flowchart illustrating a method 1400 for subchannel-based occupancy time sharing supporting an unlicensed side walkway, as described in various aspects of this disclosure, is shown. Operation of method 1400 can be implemented by the UE 115 or its components described herein. In one aspect, operation of method 1400 can be provided by reference to... Figures 7 to 10 The described communication manager performs the functions. In some respects, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Alternatively or additionally, the UE can use dedicated hardware to perform aspects of the functions described below.

[0182] In 1405, the UE can receive side-link control messages, including a sharing indicator, from the UE on a sub-channel sharing channel bandwidth. The operation of 1405 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1405 can be derived from references... Figures 7 to 10 The shared indicator component described is executed.

[0183] In 1410, the UE can determine whether the sharing indicator indicates a portion of TDM sharing, a portion of FDM sharing, or a combination thereof, for which the time is occupied. Operation of 1410 can be performed according to the methods described herein. In some respects, aspects of operation of 1410 can be derived from references... Figures 7 to 10 The described shared type determines the component execution.

[0184] In 1415, the UE can obtain access to the shared channel bandwidth for a portion of the occupancy time based on a sharing indicator and a channel access procedure for sharing the occupancy time. The operation of 1415 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1415 can be derived from references... Figures 7 to 10 The described channel access component is executed.

[0185] In section 1420, the UE can transmit sidelink data messages during the occupied time portion based on obtaining access to the shared channel bandwidth. The operation of section 1420 can be performed according to the method described herein. In some aspects, various aspects of the operation of section 1420 can be derived from references... Figures 7 to 10 The described channel-sharing component is executed.

[0186] Figure 15A flowchart illustrating a method 1500 for subchannel-based occupancy time sharing supporting an unlicensed side walkway, as described in various aspects of this disclosure, is shown. Operation of method 1500 can be implemented by the UE 115 or its components described herein. In one aspect, operation of method 1500 can be provided by reference to... Figures 7 to 10 The described communication manager performs the functions. In some respects, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Alternatively or additionally, the UE can use dedicated hardware to perform aspects of the functions described below.

[0187] In 1505, the UE (e.g., a third UE) can receive an instruction from the second UE that the first UE is the closest occupancy time sharing source for the second UE. The operation of 1505 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1505 can be derived from references... Figures 7 to 10 The hidden nodes described mitigate component execution.

[0188] In 1510, the UE can receive a side-link control message, including a sharing indicator, from a first UE on a sub-channel of shared channel bandwidth. The operation of 1510 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1510 can be derived from references... Figures 7 to 10 The shared indicator component described is executed.

[0189] In 1515, the UE can determine whether the sharing indicator indicates a portion of TDM sharing, a portion of FDM sharing, or a combination thereof. Operation of 1515 can be performed according to the methods described herein. In some aspects, various aspects of the operation of 1515 can be referenced. Figures 7 to 10 The described shared type determines the component execution.

[0190] In step 1520, the UE can determine, based on the indication that the first UE is the closest shared source of occupancy time for the second UE, to send sidelink data messages to the second UE during the occupancy time portion. The operation of step 1520 can be performed according to the method described herein. In some aspects, various aspects of the operation of step 1520 can be derived from references... Figures 7 to 10 The hidden nodes described mitigate component execution.

[0191] In 1525, the UE can obtain access to the shared channel bandwidth for a portion of the occupancy time based on a sharing indicator and a channel access procedure for sharing the occupancy time. The operation of 1525 can be performed according to the method described herein. In some aspects, various aspects of the operation of 1525 can be obtained from references... Figures 7 to 10 The described channel access component is executed.

[0192] In section 1530, the UE can transmit sidelink data messages during the occupied time portion based on obtaining access to the shared channel bandwidth. The operation of section 1530 can be performed according to the method described herein. In some aspects, various aspects of the operation of section 1530 can be obtained from references... Figures 7 to 10 The described channel-sharing component is executed.

[0193] Overview of all aspects

[0194] The following is a summary of the various aspects of this disclosure:

[0195] Aspect 1: A method for wireless communication, comprising: acquiring access to a shared channel bandwidth for an occupancy period, at least in part based on a channel access procedure; identifying a resource set for transmitting a sharing indicator; transmitting a sidelink control message including a sharing indicator on a subchannel of the shared channel bandwidth, the sharing indicator indicating time division multiplexing (TDM) sharing for a portion of the occupancy period, frequency division multiplexing (FDM) sharing for a portion of the occupancy period, or a combination thereof; and communicating during the occupancy period, at least in part based on the sharing indicator.

[0196] Aspect 2: According to the method of aspect 1, wherein the sharing indicator indicates at least FDM sharing of a first sub-channel with shared channel bandwidth, the communication comprising: during the occupancy period, concurrently with the sidelink transmission performed by the UE on the first sub-channel, sending a sidelink data message on a second sub-channel with shared channel bandwidth.

[0197] Aspect 3: According to the method of aspect 1, wherein the sharing indicator indicates at least TDM sharing of the second time slot of the occupancy time, the communication includes: sending a sidelink data message in the first time slot of the occupancy time prior to the second time slot of the occupancy time; and avoiding sending during the second time slot of the occupancy time.

[0198] Aspect 4: The method according to aspect 3 further includes: sending an occupancy signal after the side link control message is sent and before the second time slot.

[0199] Aspect 5: The method according to any one of Aspects 1 to 4 further includes: at least in part based on obtaining access to the shared channel bandwidth and sending an occupancy signal before the resource set.

[0200] Aspect 6: The method according to any one of Aspects 1 to 5, wherein a side link control message including a sharing indicator is sent in a first time slot of the occupancy time; and the sharing indicator indicates a second time slot for sharing a portion of the occupancy time.

[0201] Aspect 7: According to the method of aspect 6, the side link control message including the sharing indicator is transmitted in the latter half of the first time slot; and the transmission of the side link control message including the sharing indicator is completed before the last symbol of the first time slot.

[0202] Aspect 8: The method according to any one of Aspects 1 to 7, wherein the sharing indicator further indicates the listen-before-speak type of the response UE to share occupancy time, the channel access priority category, the energy detection threshold, the distance threshold, the interleaved frequency resource set, the device identifier, the location information, or a combination thereof.

[0203] Aspect 9: The method according to any one of Aspects 1 to 8 further includes: receiving from a base station a shared indicator configuration message indicating a resource set for transmitting a shared indicator, wherein the resource set is identified at least in part based on the shared indicator configuration message, and a side link control message is transmitted.

[0204] Aspect 10: The method according to aspect 9 further includes: sending a report message to the base station confirming the transmission of a side link control message including a sharing indicator in the resource set.

[0205] Aspect 11: The method according to aspect 9 further includes: monitoring a portion of the occupancy time on the side link feedback channel, a resource set, or a conflict between the two; and sending a report message to the base station, at least in part based on the monitoring.

[0206] Aspect 12: The method according to any one of Aspects 1 to 11, wherein identifying the resource set includes: selecting a resource set from a plurality of resource sets for sending a shared indicator, wherein a side link control message including the shared indicator is sent in the selected resource set.

[0207] Aspect 13: The method according to aspect 12 further includes: identifying multiple resource sets based at least in part on system information block messages, dedicated radio resource control messages, downlink control information messages, pre-configuration, or a combination thereof.

[0208] Aspect 14: The method according to any one of Aspects 1 to 13, wherein the resource set indicates the listen-before-speak type, channel access priority category, energy detection threshold, or a combination thereof for the UE to share occupancy time.

[0209] Aspect 15: The method according to any one of Aspects 1 to 14, wherein the resource set includes a time resource set, a frequency resource set, a beam set, or a combination thereof.

[0210] Aspect 16: The method according to any one of Aspects 1 to 15 further includes: determining the earliest check-out time of the occupancy time based at least in part on a channel access priority category, an energy detection threshold, or a combination thereof, wherein a portion of the occupancy time is based at least in part on the earliest check-out time of the occupancy time.

[0211] Aspect 17: The method according to any one of Aspects 1 to 16, wherein the channel access procedure includes a listen-before-speak procedure, the method further comprising: performing a listen-before-speak procedure for shared channel bandwidth, wherein the access to the shared channel bandwidth for the acquired time is at least partially based on the success of the listen-before-speak procedure.

[0212] Aspect 18: According to the method of aspect 17, wherein performing the listen-before-speak process includes: monitoring the energy level of the shared channel bandwidth during a contention window asynchronous with the frame timing associated with the communication, wherein obtaining access to the shared channel bandwidth for the occupied time is based at least in part on the energy level being below an energy detection threshold of the contention window.

[0213] Aspect 19: The method according to aspect 18 further includes: determining the duration of the contention window based at least in part on system information block messages, radio resource control messages, downlink control information messages, pre-configuration, channel occupancy rate, sidelink feedback channel information, collision rate, or a combination thereof.

[0214] Aspect 20: The method according to any one of Aspects 1 to 16, wherein the channel access process includes a license-based process, the method further comprising: receiving a license for occupancy time of shared channel bandwidth from a base station, wherein the access to the shared channel bandwidth for the occupancy time is at least partially license-based.

[0215] Aspect 21: The method according to any one of Aspects 1 to 20, wherein the sidelink control message includes a message of sidelink control information in the first phase, a message of sidelink control information in the second phase, a sidelink control message with time-sharing occupancy, or a combination thereof.

[0216] Aspect 22: A method for wireless communication, comprising: receiving from a UE a sidelink control message including a sharing indicator from a resource set on a subchannel of shared channel bandwidth; determining that the sharing indicator indicates TDM sharing for a portion of the occupancy time, FDM sharing for a portion of the occupancy time, or a combination thereof; obtaining access to the shared channel bandwidth for a portion of the occupancy time, at least in part based on the sharing indicator and a channel access procedure performed by the UE for the shared occupancy time; and transmitting a sidelink data message during the occupancy time portion, at least in part based on obtaining access to the shared channel bandwidth.

[0217] Aspect 23: According to the method of aspect 22, wherein the sharing indicator indicates at least FDM sharing of a first sub-channel with shared channel bandwidth, the transmission comprising: during the occupancy period, concurrently with the sidelink transmission performed by the UE on the second sub-channel, transmitting a sidelink data message on the first sub-channel with shared channel bandwidth.

[0218] Aspect 24: According to the method of aspect 22, wherein the sharing indicator indicates at least TDM sharing of the second time slot of the occupancy time, the transmission includes: avoiding transmission during the first time slot of the occupancy time prior to the second time slot of the occupancy time; and transmitting a sidelink data message in the second time slot of the occupancy time.

[0219] Aspect 25: The method according to any one of Aspects 22 to 24, wherein the channel access procedure for sharing occupancy time includes a listen-before-speak procedure, the method further comprising: performing a listen-before-speak procedure for sharing channel bandwidth at least in part based on a portion of the occupancy time, wherein access to the shared channel bandwidth for the portion of the occupancy time is obtained at least in part based on the success of the listen-before-speak procedure.

[0220] Aspect 26: According to the method of aspect 25, the listen-before-speak process includes a first listen-before-speak process corresponding to a first monitoring duration, wherein the first monitoring duration is shorter than the second monitoring duration of a second listen-before-speak process associated with a contention occupancy time.

[0221] Aspect 27: The method according to any one of Aspects 22 to 26, wherein the transmission comprises: transmitting a sidelink data message during a portion of the occupied time without performing an idle channel assessment of the shared channel bandwidth.

[0222] Aspect 28: The method according to any one of Aspects 22 to 27, wherein a side link control message including a sharing indicator is received in a first time slot of the occupancy time; and the sharing indicator indicates a second time slot for sharing a portion of the occupancy time.

[0223] Aspect 29: The method according to aspect 28 further includes: entering a sleep mode at least in part based on receiving a sharing indicator in a first time slot of the occupancy period; and exiting the sleep mode before a second time slot of the occupancy period.

[0224] Aspect 30: The method according to any one of Aspects 28 to 29, wherein: the side link control message including the shared indicator is received in the latter half of the first time slot; and the reception of the side link control message including the shared indicator is completed before the last symbol of the first time slot.

[0225] Aspect 31: The method according to any one of Aspects 22 to 30 further includes: determining that the shared indicator is a valid shared indicator based at least in part on a distance threshold of the shared indicator, an interleaving frequency resource set, or a combination thereof.

[0226] Aspect 32: The method according to any one of Aspects 22 to 31, wherein the UE includes a first UE, the method further comprising: receiving from a second UE an indication that the first UE includes the closest occupancy time sharing source of the second UE; and determining, at least in part based on the indication that the first UE includes the closest occupancy time sharing source of the second UE, to send a sidelink data message to the second UE during a portion of the occupancy time.

[0227] Aspect 33: The method according to aspect 32 further includes: determining that a hidden node is interfering with one or more transmissions of the second UE, wherein determining that sending a sidelink data message to the second UE during a portion of the occupancy time is also at least partially based on the hidden node.

[0228] Aspect 34: The method according to any one of Aspects 22 to 33, wherein the sharing indicator further indicates a listen-before-speak type, a channel access priority category, an energy detection threshold, a UE device identifier, UE location information, or a combination thereof for sharing occupancy time.

[0229] Aspect 35: The method according to any one of aspects 22 to 34 further includes: monitoring a plurality of resource sets of shared indicators, wherein, at least in part based on monitoring, a side link control message including the shared indicator is received in a resource set of the plurality of resource sets.

[0230] Aspect 36: The method according to aspect 35 further includes: identifying multiple resource sets based at least in part on system information block messages, dedicated radio resource control messages, downlink control information messages, pre-configuration, or a combination thereof.

[0231] Aspect 37: The method according to any one of Aspects 35 to 36 further includes: determining, at least in part based on a resource set, a listen-before-speak type, a channel access priority category, an energy detection threshold, or a combination thereof for sharing occupancy time.

[0232] Aspect 38: The method according to any one of aspects 35 to 37, wherein the resource set includes a time resource set, a frequency resource set, a beam set, or a combination thereof.

[0233] Aspect 39: The method according to any one of Aspects 22 to 38, wherein the sidelink control message includes a message of sidelink control information in the first phase, a message of sidelink control information in the second phase, a sidelink control message with time-sharing occupancy, or a combination thereof.

[0234] Aspect 40: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method described in any one of aspects 1 to 21.

[0235] Aspect 41: An apparatus for wireless communication, comprising: at least one device for performing the method described in any one of aspects 1 to 21.

[0236] Aspect 42: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform the method described in any one of aspects 1 to 21.

[0237] Aspect 43: An apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method described in any one of aspects 22 to 39.

[0238] Aspect 44: An apparatus for wireless communication, comprising: at least one device for performing the method described in any one of aspects 22 to 39.

[0239] Aspect 45: A non-transitory computer-readable medium for storing code for wireless communication, the code including instructions executable by a processor to perform the method described in any one of aspects 22 to 39.

[0240] It should be noted that the methods described herein depict possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0241] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. In one respect, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Seamless Handover OFDM (Flash-OFDM), and other systems and radio technologies not explicitly mentioned herein.

[0242] The information and signals described herein can be represented using a variety of different techniques and skills. In one respect, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0243] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in another case, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other combination of such configurations).

[0244] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions can be stored as one or more instructions or code on or transmitted over a computer-readable medium. Other aspects and implementations fall within the scope of this disclosure and the appended claims. In one aspect, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions can also be physically located in different places, including being distributed so that portions of the functions are implemented at different physical locations.

[0245] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one place to another. Non-transitory storage media can be any available medium accessible by a general-purpose or special-purpose computer. For example (but not limitingly), non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store the desired program code in the form of instructions or data structures and is accessible by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Furthermore, any connection is properly referred to as computer-readable media. In one aspect, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared, radio, and microwave), then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) is included in the definition of computer-readable media. The terms "disk" and "disc" as used in this article include CDs, laser discs, optical discs, digital versatile optical discs (DVDs), floppy disks, and Blu-ray discs. Disks typically copy data magnetically, while optical discs copy data optically using lasers. Combinations of these are also included within the scope of computer-readable media.

[0246] As used herein (including in the claims), the use of "or" in a list of items (e.g., a list of items followed by phrases such as "at least one of" or "one or more of") indicates an inclusive list, whereby a list consisting of at least one of A, B, or C refers to A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be construed as referring to a closed set of conditions. In one aspect, without departing from the scope of this disclosure, an example step described as "based on condition A" may be based on both condition A and condition B. In other words, as used herein, the phrase "based on" should be understood to be the same as the phrase "at least partially based on".

[0247] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by adding a dash after the reference numeral and a second reference numeral to differentiate them from similar components. If only the first reference numeral is used in the description, the description applies to any similar component having the same first reference numeral, without regard to the second or other subsequent reference numerals.

[0248] The description herein, taken in conjunction with the accompanying drawings, illustrates exemplary configurations and does not represent all achievable examples or those falling within the scope of the claims. The term "example" as used herein means "as an example, instance, or illustration," and not "preferred" or "more advantageous than other examples." The detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may also be implemented without these specific details. In some cases, known structures and devices are shown in the form of block diagrams to avoid obscuring the concept of the described examples.

[0249] This description is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and other variations can be applied to the general principles defined herein without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the aspects and designs described herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: At least in part, access to the shared channel bandwidth is obtained for an occupied time based on a channel access procedure, wherein the channel access procedure is successful in the first time slot of the occupied time; A second resource set is identified for sending a sharing indicator, the sharing indicator including sharing information about the occupancy time; At least in part, based on access to the shared channel bandwidth and transmitting an occupancy signal via a first resource set on a sub-channel of the shared channel bandwidth, the first resource set being included in a first time slot of the occupancy time and in time prior to a second resource set for transmitting the sharing indicator, wherein the first resource set and the second resource set are consecutive in the first time slot, and wherein the occupancy signal includes a repetition of at least a portion of the sharing information included in the sharing indicator; On a sub-channel of the shared channel bandwidth and via a second resource set following the first resource set, a side link control message including the sharing indicator is transmitted, including the sharing information in the sharing indicator indicating time division multiplexing (TDM) sharing of the occupied time portion, frequency division multiplexing (FDM) sharing of the occupied time portion, or a combination thereof; as well as Communication occurs during the occupancy period, at least in part based on the shared indicator.

2. The method according to claim 1, wherein, The sharing indicator indicates at least FDM sharing of the first sub-channel of the shared channel bandwidth, and the communication includes: During the occupancy period, sidelink data messages are transmitted concurrently on the second subchannel of the shared channel bandwidth with sidelink transmissions performed by the user equipment (UE) on the first subchannel.

3. The method according to claim 1, wherein, The sharing indicator indicates at least TDM sharing of the second time slot of the occupied time, and the communication includes: Transmit sidelink data messages in the first time slot of the occupancy time preceding the second time slot of the occupancy time; and Transmission is avoided during the second time slot of the occupied time.

4. The method according to claim 3, further comprising: After the side link control message is sent and before the second time slot, a second occupancy signal is sent.

5. The method according to claim 1, wherein: The sharing indicator indicates a second time slot for sharing a portion of the occupied time.

6. The method according to claim 1, wherein, The sharing indicator also instructs the responding user equipment (UE) to share the listen-before-speak type, channel access priority category, energy detection threshold, distance threshold, interleaved frequency resource set, device identifier, location information, or a combination thereof for the occupancy time.

7. The method according to claim 1, further comprising: Receive a shared indicator configuration message indicating a second resource set for sending the shared indicator, wherein the second resource set is identified, at least in part based on the shared indicator configuration message, and the side link control message is sent; and A report message confirming the transmission of the side link control message, including the shared indicator, in the second resource set is sent.

8. The method according to claim 1, further comprising: A shared indicator configuration message is received, indicating a second resource set for sending the shared indicator, wherein the second resource set is identified based at least in part on the shared indicator configuration message, and the side link control message is sent. Monitoring the portion of the occupancy time on the side link feedback channel, the second resource set, or conflicts in both; and Report messages are sent based at least in part on the monitoring.

9. The method according to claim 1, further comprising: The earliest check-out time of the occupancy time is determined based at least in part on the channel access priority category, energy detection threshold, or a combination thereof, wherein the occupancy time is at least partially based on the earliest check-out time of the occupancy time.

10. The method according to claim 1, wherein, The channel access process includes a listen-before-speak process, and the method further includes: The process of performing a listen-before-speak procedure for shared channel bandwidth is described, wherein the acquisition of access to the shared channel bandwidth for the specified time is at least partially based on the success of the listen-before-speak procedure, and wherein performing the listen-before-speak procedure includes: The energy level of the shared channel bandwidth is monitored during a contention window that is asynchronous with the frame timing associated with the communication, wherein the access to the shared channel bandwidth for the occupied time is obtained at least in part based on the energy level being below the energy detection threshold of the contention window.

11. A method for wireless communication, comprising: On a sub-channel sharing the channel bandwidth, an occupancy signal is received from the user equipment (UE) via a first resource set; On a sub-channel of the shared channel bandwidth, the UE receives a sidelink control message from a second resource set including a sharing indicator, the second resource set being temporally after the first resource set, wherein the first resource set and the second resource set are consecutive in a first time slot of the occupancy time, wherein the sharing indicator includes shared information of the occupancy time, and wherein the occupancy signal includes a repetition of at least a portion of the shared information included in the sharing indicator. The sharing information included in the sharing indicator indicates a time division multiplexing (TDM) sharing of the portion of the occupied time, a frequency division multiplexing (FDM) sharing of the portion of the occupied time, or a combination thereof; Access to the shared channel bandwidth for a portion of the occupied time is obtained, at least in part based on the shared indicator and the channel access procedure performed by the UE for sharing the occupied time, wherein the channel access procedure is successful in a first time slot of the occupied time; as well as At least in part, based on obtaining access to the shared channel bandwidth, sidelink data messages are sent during a portion of the occupied time.

12. The method according to claim 11, wherein, The sharing indicator indicates at least FDM sharing of the first sub-channel of the shared channel bandwidth, and the transmission includes: During the occupancy period, the sidelink data message is transmitted concurrently on the first sub-channel of the shared channel bandwidth with the sidelink transmission performed by the UE on the second sub-channel of the shared channel bandwidth.

13. The method according to claim 11, wherein, The sharing indicator indicates at least TDM sharing of the second time slot of the occupied time, and the transmission includes: Avoid transmission during the first time slot of the occupied time preceding the second time slot of the occupied time; and The side link data message is sent in the second time slot of the occupied time.

14. The method according to claim 11, wherein, The channel access procedure for sharing the occupied time includes a listen-before-speak process, and the method further includes: The listen-before-speak process for the shared channel bandwidth is performed at least in part based on a portion of the occupied time, wherein access to the shared channel bandwidth for the portion of the occupied time is at least in part based on the success of the listen-before-speak process, and wherein the listen-before-speak process includes a first listen-before-speak process corresponding to a first monitoring duration, wherein the first monitoring duration is shorter than a second monitoring duration of a second listen-before-speak process associated with competition for the occupied time.

15. An apparatus for wireless communication, comprising: processor; and A memory coupled to the processor, wherein the memory includes instructions executable by the processor to cause the device to perform the following operations: At least in part, access to the shared channel bandwidth is obtained for an occupied time based on a channel access procedure, wherein the channel access procedure is successful in the first time slot of the occupied time; A second resource set is identified for sending a sharing indicator, the sharing indicator including sharing information for the occupancy time; At least in part, based on access to the shared channel bandwidth and transmitting an occupancy signal via a first resource set on a sub-channel of the shared channel bandwidth, the first resource set being included in a first time slot of the occupancy time and in time prior to a second resource set for transmitting the sharing indicator, wherein the first resource set and the second resource set are consecutive in the first time slot, and wherein the occupancy signal includes a repetition of at least a portion of the sharing information included in the sharing indicator; On a sub-channel of the shared channel bandwidth and via a second resource set following the first resource set, a side link control message including the sharing indicator is transmitted, including the sharing information in the sharing indicator indicating time division multiplexing (TDM) sharing of the occupied time portion, frequency division multiplexing (FDM) sharing of the occupied time portion, or a combination thereof; as well as Communication occurs during the occupancy period, at least in part based on the shared indicator.

16. The apparatus according to claim 15, wherein, The sharing indicator indicates at least FDM sharing of the first sub-channel of the shared channel bandwidth, and the instructions for communication can also be executed by the processor to enable the device to: During the occupancy period, sidelink data messages are transmitted concurrently on the second subchannel of the shared channel bandwidth with sidelink transmissions performed by the user equipment (UE) on the first subchannel.

17. The apparatus according to claim 15, wherein, The sharing indicator indicates at least TDM sharing of the second time slot of the occupied time, and the instructions for communication can also be executed by the processor to enable the device to: Transmit sidelink data messages in the first time slot of the occupancy time preceding the second time slot of the occupancy time; and Transmission is avoided during the second time slot of the occupied time.

18. The apparatus according to claim 17, wherein, The instructions can also be executed by the processor to cause the device to: After the side link control message is sent and before the second time slot, a second occupancy signal is sent.

19. The apparatus according to claim 15, wherein: The sharing indicator indicates a second time slot for sharing a portion of the occupied time.

20. The apparatus according to claim 19, wherein: The side link control message, including the shared indicator, is transmitted in the latter half of the first time slot; and The transmission of the side link control message, including the shared indicator, is completed before the last symbol of the first time slot.

21. The apparatus according to claim 15, wherein, The sharing indicator also instructs the responding user equipment (UE) to share the listen-before-speak type, channel access priority category, energy detection threshold, distance threshold, interleaved frequency resource set, device identifier, location information, or a combination thereof for the occupancy time.

22. The apparatus according to claim 15, wherein, The instructions can also be executed by the processor to cause the device to: Receive a shared indicator configuration message indicating a second resource set for sending the shared indicator, wherein the second resource set is identified, at least in part based on the shared indicator configuration message, and the side link control message is sent; and A report message confirming the transmission of the side link control message, including the shared indicator, in the second resource set is sent.

23. The apparatus according to claim 15, wherein, The instructions can also be executed by the processor to enable the device to: A shared indicator configuration message is received, indicating a second resource set for sending the shared indicator, wherein the second resource set is identified based at least in part on the shared indicator configuration message, and the side link control message is sent. The monitored portion of the occupancy time on the crosslink feedback channel, the second resource set, or a conflict in both; and Report messages are sent based at least in part on the monitoring.

24. The apparatus according to claim 15, wherein, The instructions can also be executed by the processor to cause the device to: At least in part based on system information block messages, dedicated radio resource control messages, downlink control information messages, pre-configuration, or a combination thereof, multiple resource sets used to transmit the shared indicator are identified; as well as The second resource set is selected from the plurality of resource sets, wherein the side link control message including the sharing indicator is sent in the selected second resource set.

25. The apparatus according to claim 15, wherein, The second resource set indicates that the responding user equipment (UE) shares the listen-before-speak type, channel access priority category, energy detection threshold, or a combination thereof for the occupancy time.

26. An apparatus for wireless communication, comprising: processor; and A memory coupled to the processor, wherein the memory includes instructions executable by the processor to cause the device to perform the following operations: On a sub-channel sharing the channel bandwidth, an occupancy signal is received from the user equipment (UE) via a first resource set; On a sub-channel of the shared channel bandwidth, the UE receives a sidelink control message from a second resource set including a sharing indicator, the second resource set being temporally after the first resource set, wherein the first resource set and the second resource set are consecutive in a first time slot of the occupancy time, wherein the sharing indicator includes shared information of the occupancy time, and wherein the occupancy signal includes a repetition of at least a portion of the shared information included in the sharing indicator. The sharing information included in the sharing indicator indicates a time division multiplexing (TDM) sharing of the portion of the occupied time, a frequency division multiplexing (FDM) sharing of the portion of the occupied time, or a combination thereof; Access to the shared channel bandwidth for a portion of the occupied time is obtained, at least in part based on the shared indicator and the channel access procedure for sharing the occupied time, wherein the channel access procedure is successful in a first time slot of the occupied time; as well as At least in part, based on obtaining access to the shared channel bandwidth, sidelink data messages are sent during a portion of the occupied time.

27. The apparatus according to claim 26, wherein, The sharing indicator indicates at least FDM sharing of the first sub-channel of the shared channel bandwidth, and the instructions for transmission can also be executed by the processor to cause the apparatus to: During the occupancy period, the sidelink data message is transmitted concurrently on the first sub-channel of the shared channel bandwidth with the sidelink transmission performed by the UE on the second sub-channel of the shared channel bandwidth.

28. The apparatus according to claim 26, wherein, The sharing indicator indicates at least TDM sharing of the second time slot of the occupied time, and the instructions for transmission can also be executed by the processor to enable the device to: Avoid transmission during the first time slot of the occupied time preceding the second time slot of the occupied time; and The side link data message is sent in the second time slot of the occupied time.

29. The apparatus according to claim 26, wherein, The channel access procedure for sharing the occupied time includes a listen-before-speak process, and the instructions can also be executed by the processor to cause the device to: The listen-before-speak process for the shared channel bandwidth is performed at least in part based on a portion of the occupied time, wherein access to the shared channel bandwidth for the portion of the occupied time is at least in part based on the success of the listen-before-speak process, wherein the listen-before-speak process includes a first listen-before-speak process corresponding to a first monitoring duration, wherein the first monitoring duration is shorter than a second monitoring duration of a second listen-before-speak process associated with competing for the occupied time.

30. The apparatus according to claim 26, wherein, The instructions can also be executed by the processor to enable the device to: At least in part, based on receiving a sidelink control message including the sharing indicator in a first time slot of the occupancy time, the system enters a sleep mode, wherein the sharing indicator indicates a second time slot for sharing a portion of the occupancy time; and Exit the sleep mode before the second time slot of the occupied time.

31. An apparatus for performing wireless communication at a user equipment (UE), the apparatus comprising components for performing the method of any one of claims 1-14.

32. A computer-readable medium having program code recorded thereon, wherein the program code is executable by one or more processors of a user equipment (UE) to cause the processor to perform the method of any one of claims 1-14.

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