142 results about "Listen before talk" patented technology

Systems, methods, and instrumentalities are described herein that may be associated with frame-based equipment (FBE) channel access in sidelink (SL) unlicensed. A wireless transmit / receive unit (WTRU) may receive configuration information that indicates a channel busy ratio (CBR) threshold. The WTRU may determine a CBR value associated with a channel in a listen before talk (LBT) band. The WTRU may compare the CBR value to the CBR threshold. The WTRU may determine a channel access parameter based on the comparison of the CBR value to the CBR threshold. The WTRU may change the channel access parameter.

A method and an apparatus for performing communication in a wireless communication system are disclosed. A method for performing communication by a first terminal according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, configuration information related to a plurality of sidelink (SL) resource pools and a plurality of resource block (RB) sets; detecting and triggering a consistent SL listen before talk (LBT) failure for at least one of a first SL resource pool and a first RB set among the plurality of SL resource pools and the plurality of RB sets; and triggering, on the basis that the triggered consistent SL LBT failure is not canceled, SL resource reselection for selecting a second SL resource pool or a second RB set from among the plurality of resource pools and the plurality of RB sets.

A user equipment (UE) is configured to share sub-channel resources from among available sidelink channel resources with second UEs. The device transmits a sidelink channel occupancy sharing indicator that enables at least two devices to transmit data utilizing available sidelink channel resources within a channel occupancy duration. The sidelink channel occupancy sharing indicator includes a value for a selected listen before talk (LBT) type from among multiple LBT types for channel sensing. The LBT type signals, to a second UE receiving the sidelink channel occupancy sharing indicator, which LBT procedure to utilize before accessing resources identified by the sharing indicator. The UE allocates the available sidelink channel resources to the at least two second UEs to enable multiple devices to cooperatively share available sidelink channel resources via non-overlapping time or frequency domain usage in order to achieve a channel occupancy threshold level of resource utilization in an unlicensed spectrum.

A method by which a first device performs wireless communication, and a device for supporting same are provided. The method may comprise the steps of: acquiring a configuration related to inter-UE coordination (IUC) information reporting; initiating an IUC report timer on the basis that the IUC information reporting is triggered; performing listen before talk (LBT); and stopping the IUC report timer on the basis of (i) the generation of an IUC information medium access control (MAC) control element (CE), and on the basis of (ii) the success of the LBT.

The present disclosure provides apparatuses and methods for establishing a random access. The apparatuses include a terminal which comprises circuitry which, in operation, generates a first random access preamble; and a transmitter which, in operation, transmits the first random access preamble to a base station on a first physical random access channel (PRACH) occasion (RO) among a plurality of RO candidates, the plurality of RO candidates being determined based on PRACH configuration information received from the base station, wherein the first RO is assigned within a first frequency region, the first frequency region being equal to a first sub-band in which a listen before talk (LBT) procedure is performed at the terminal.

Methods, systems, and devices for wireless communication are described. In some systems, a sidelink user equipment (UE) may prioritize multiple sidelink feedback channels for transmission via at least partially overlapping time resources. The UE may prioritize sidelink feedback channels according to prioritization parameters, where each prioritization parameter may be associated with a respective likelihood of success of a listen before talk (LBT) process for a respective sidelink feedback channel. The UE selects a subset of sidelink feedback channels based on the prioritization, and may perform one or more LBT procedures to access a shared radio spectrum band for transmission of the subset of sidelink feedback channels. The UE may transmit a subset of sidelink feedback channels during one or more channel occupancy time intervals of one or more successful LBT processes based on performing the one or more LBT processes.

The present disclosure provides a method of transmitting a physical sidelink feedback channel (PSFCH) by a terminal in a wireless communication system. In particular, the method may comprise: receiving a physical sidelink control channel (PSCCH); receiving a first physical sidelink shared channel (PSSCH) on the basis of the PSCCH; performing listen before talk (LBT) for an LBT gap; and transmitting a PSFCH corresponding to the first PSSCH on the basis that the LBT has been successful, wherein the LBT gap is positioned immediately before the foremost symbol among symbols for the PSFCH, and transmission of a second PSSCH may continue to the LBT gap from a symbol immediately after the last symbol among symbols for the second PSSCH having been transmitted by the terminal before the PSFCH.

Embodiments of the present disclosure relate to methods and apparatuses for sidelink synchronization signal block (S-SSB) transmission in an unlicensed spectrum. According to an embodiment of the present disclosure, a user equipment (UE) can include: a processor configured to: obtain configuration information for S-SSB in an unlicensed spectrum based on configuration or pre-configuration, wherein the configuration information includes at least one of the following: a first configuration associated with a time interval between adjacent S-SSB occasions sharing a same channel occupancy time (COT); a second configuration for performing listen before talk (LBT) type 2; or a third configuration for performing LBT type 1; and perform an LBT procedure associated with an S-SSB occasion based on the configuration information; a transmitter coupled to the processor and configured to transmit an S-SSB on the S-SSB occasion in response to the LBT procedure being successful; and a receiver coupled to the processor.

An example user equipment (UE) device for wireless communication includes a communication interface; and one or more processors coupled to the communication interface, wherein the one or more processors are configured to: select a first cyclic prefix extension (CPE) for a transmission over a shared sidelink band via the communication interface; perform a listen before talk (LBT) procedure on the shared sidelink band; in response to the LBT procedure, determine that the shared sidelink band is LBT-blocked; in response to the shared sidelink band being LBT-blocked, select a second CPE larger than the first CPE; and transmit the second CPE and the transmission over the shared sidelink band via the communication interface.

A method, an apparatus, a terminal, and a medium for processing a sidelink consistent listen before talk failure, are provided. The method for processing a sidelink consistent listen before talk (LBT) failure includes: determining, by a terminal, that the sidelink consistent LBT failure is triggered on a first resource; and performing, by the terminal, a first operation, where the first operation includes at least one of the following: resource selection or resource reselection or resource switching; determining that the first resource is recovered from the sidelink consistent LBT failure, or canceling the sidelink consistent LBT failure triggered on the first resource; and a Media Access Control (MAC) layer of the terminal informs a PHYsical (PHY) layer: the first resource is recovered from the sidelink consistent LBT failure, or canceling the sidelink consistent LBT failure triggered on the first resource.

This communication device includes a control circuit that forms a plurality of beams, and a communication circuit that transmits each of a plurality of broadcast frames in association with the respective beams. The communication circuit transmits the plurality of broadcast frames on the basis of a result of Listen Before Talk (LBT) carried out in the direction of the respective beams.

Devices, systems and methods for a fifth generation (5G) or new radio (NR) system comprising determining a configuration for an uplink (UL) transmission resource with respect to a listen before talk (LBT) operation on an unlicensed spectrum and transmitting uplink control information (UCI) on the UL transmission resource based on the configuration subjected to the LBT operation.

A method and a device for performing communication in a wireless communication system are disclosed. The method implemented by a first terminal, according to an embodiment of the present disclosure, comprises the steps of: receiving, from a base station, configuration information related to one or more resource block (RB) sets for sidelink (SL) transmission; and, on the basis of consistent SL listen before talk (LBT) failure being detected for a specific RB set among the one or more RB sets, transmitting a medium access control (MAC) control element (CE) related to the consistent SL LBT failure to the base station, wherein the MAC CE may contain information indicating that the consistent SL LBT failure has been detected for the specific RB set.

A wireless device receives one or more messages comprising a parameter indicating a first value of a listen before talk (LBT) counter. The LBT counter is incremented based on an LBT procedure indicating an LBT failure for an uplink transmission via a first bandwidth part. Based on the LBT counter reaching the first value, a switch is made from the first bandwidth part to a second bandwidth part as an active bandwidth part.

A wireless communication method, a terminal device and a storage medium are provided. The method includes: a terminal device performs a first operation related to consecutive listen before talk (LBT) failures, the detection of the consecutive LBT failures being related to a resource granularity.

A communication method includes determining, at a first time, that listen before talk (LBT) on a first resource meets a consistent LBT failure. The communication method also includes determining a first duration. The communication method further includes determining a first resource set from a resource selection window based on the first time and the first duration. A resource in the first resource set is used for sidelink communication.

LBT adaptation, beam operation, and / or interference handling may be performed by wireless communication devices in NR above 52.6 GHZ. In an example, a wireless communications device may send information on a channel. The channel may comprise a Physical Downlink Control Channel (PDCCH), a Physical Downlink Shared Data Channel (PDSCH), or a Physical Random Access Channel (PRACH). The wireless communications device may receive, from a user equipment (UE), one or more ready to receives (RTRs). The wireless communications device may determine, based on a number of consecutive RTRs of the one or more RTRs, a listen before talk (LBT) mode. The LBT mode may be associated with staying or switching to a no receiver assistance mode or staying or switching to a receiver assistance mode.

An apparatus including a non-transitory memory including instructions stored thereon for monitoring synchronous signals and physical broadcast channels (SSBs) from a network node. The apparatus also includes a processor, operably coupled to the non-transitory memory, configured to execute a set of instructions. The instructions include configuring the apparatus for a STTC (SSB Transmission Timing Configuration). The STTC is a time interval with plural locations accommodating transmission of the SSBs. The instructions also include monitoring the STTC for the SSBs. The instructions further include determining a first one of the SSBs in a first slot of a subframe in a scheduled SSB transmission in the STTC has been transmitted at a first scheduled location, where the transmission of the first one of the SSBs is based upon confirmation of a successful Listen Before Talk (LBT) available channel prior to the scheduled SSB transmission in the STTC.

The present application provides a wireless communication method and a terminal device. The method comprises: a terminal device determines a first policy related to consecutive listen before talk (LBT) failures, the detection of the consecutive LBT failures being related to a resource granularity.

Apparatuses, methods, and systems are disclosed for increasing the transmission reliability for transmissions of a duplication bearer in a shared or unlicensed spectrum. A UE apparatus for a mobile network (“NW”) includes a transceiver that initiates a listen before talk procedure (“LBT”) on shared spectrum, for transmission of a medium access control (“MAC”) protocol data unit (“PDU”) containing an original packet data convergence protocol (“PDCP”) PDU of a data radio bearer (“DRB”) configured for PDCP duplication, wherein PDCP duplication is deactivated for the DRB. The apparatus includes a processor that determines whether the LBT failed or succeeded and selectively enables PDCP duplication for the DRB in response to determining that the PDCP PDU was not transmitted due to failure of the LBT.

A method performed by a first device in a wireless communication system, and a device supporting same are provided. The method may comprise the steps of: obtaining configuration information related to a resource pool; obtaining configuration information related to SL LBT failure recovery, including information related to a maximum number of sidelink (SL) listen before talk (LBT) failures; performing LBT before SL transmission in a first set of resource blocks (RBs) in the resource pool; on the basis of the SL transmission not being performed, increasing an LBT counter by one; triggering a consistent SL LBT failure, on the basis of the LBT counter reaching the maximum number of SL LBT failures; and selecting a sidelink grant from a second set of RBs different from the first set of RBs, on the basis of the triggered consistent SL LBT failure.

A terminal includes: a control unit configured to, when transmitting a first signal related to a device-to-device direct communication, perform an LBT (Listen before talk) for transmitting a second signal to be transmitted after the first signal; and a transmission unit configured to transmit at least the second signal in a case where the LBT is successful. In a case where a duration of the LBT overlaps with the first signal in a time domain, the control unit does not perform an LBT during a time period in which the first signal is transmitted.

This application provides a wireless communication method and terminal equipment. The method includes the terminal equipment determining a first policy related to consecutive LBT (Listen Before Talk) failures, wherein the detection of said consecutive LBT failures is related to resource granularity.

In accordance with an example embodiment of the present invention there is at least a method and apparatus for performing acquisition of access to a channel to initiate transmission of a charging signal and an activation signal, where acquisition of access to a channel is based at least on a selected channel access priority category, using a listen before talk procedure having a duration, and wherein the selected channel access priority category is selected based on the determined time to charge the energy storage device. Further, for performing an activation signal is received from an activating device of the communication network, where the activation signal includes information on at least one of: a type of listen-before-talk to be applied by the energy storage device, or a remaining effective channel occupancy time in which the energy storage device can apply the indicated type of listen-before-talk.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an uplink communication, associated with a reference duration, in an uplink burst. The UE may receive hybrid automatic repeat request (HARQ) feedback after transmitting the uplink communication. The UE may adjust a size of a listen before talk (LBT) contention window based at least in part on whether the HARQ feedback is associated with the reference duration. Numerous other aspects are provided.

Wireless communications systems and methods related to frequency resource reservation for sidelink communications over a shared radio frequency band are provided. A first user equipment (UE) senses in a pool of sidelink resources within a shared radio frequency band. The first UE reserves, based on the sensing, a frequency resource of the pool of sidelink resources for an instance of a variable time range. The first UE performs one or more listen before talk (LBT) in the shared radio frequency band. The first UE transmits, based on the one or more LBT, a sidelink transmission to a second UE using the frequency resource for the instance of the variable time range.

The present disclosure provides methods and apparatus for channel access switching in a wireless communication system with or without listen before talk and / or with different types of efficient operation of listen before talk. An apparatus including a user equipment or a base station can determine whether and / or how to perform listen before talk for a transmission based on a characteristic of the transmission. The characteristic can be a resource allocation for the transmission. The characteristic can be a manner in which resources are allocated for the transmission. The characteristic can be a length or size of resources allocated for the transmission. The characteristic can be an amount of resources allocated for the transmission. The resource allocation can be a time domain resource allocation and / or a frequency domain resource allocation.

A method for physical sidelink feedback channel (PSFCH) transmission on a sidelink are provided. Transmission on the sidelink is performed over an unlicensed spectrum. The method includes: determining a listen before talk (LBT) type for transmitting multiple PSFCHs when the multiple PSFCHs are required to be transmitted over the unlicensed spectrum; and performing LBT according to the LBT type determined, and transmitting the multiple PSFCHs according to a sensing result.

This patent document describes, among other things techniques for determining when to switch between a channel access procedure that includes a listen before talk (LBT) process and a channel access procedure that does not include a LBT process. In one aspect, a method of wireless communication is disclosed. The method includes receiving, by a first network node from a second network node, a message specifying a first channel access procedure to be used by the first network node after being powered up. The method further includes selecting, by the first network node, a second channel access procedure to be used after the first channel access procedure after satisfying a condition, wherein if the condition is not satisfied the first network node continues to use the first channel access procedure.