96 results about "Listen before talk" patented technology

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 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.

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.

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.

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.

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.

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.

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 system and a method are disclosed for determining, by a targeted receiving User Equipment (UE), that a corresponding transmitting UE has a future reserved resource block. The receiving UE may perform a Listen Before Talk (LBT) sensing to identify a time period when an unlicensed channel is unoccupied and can be used by the corresponding transmitting UE for the future reserved sidelink transmission. The receiving UE may transmit a reservation signal for the unlicensed channel to the corresponding transmitting UE, during at least a portion of the time period when the unlicensed channel is unoccupied. Further, the receiving UE may, switch, to a receiving mode prior to or at a reserved slot boundary of the future reserved resource block.

Systems and methods for changing listen before talk (LBT) for unlicensed networks are provided. In some embodiments, a method performed by a wireless device includes receiving, from a base station, signaling indicating when the wireless device is to use LBT for transmissions; determining, based on the received signaling, whether LBT is to be used for transmissions; and transmitting based on the determination of whether LBT is to be used for transmissions. Some embodiments provide a low-complexity (in terms of signaling overhead and specification impact) approach to adaptively using LBT mechanisms by defining two simple modes for LBT operation (LBT mode and no-LBT mode). Some embodiments reduce the probability of simultaneous transmissions causing collisions by using LBT mode in environments and situations where network performance suffers from collisions and / or interference.

A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE performs a first transmission without Listen Before Talk (LBT), wherein the first transmission is a preamble transmission. The UE performs LBT for a second transmission for a signal other than preamble.

Disclosed is a method for transmitting a signal by an apparatus in a wireless communication system. In particular, the method may be characterized by: performing a first listen before talk (LBT) for the entire second bandwidth including a plurality of first bandwidths; on the basis of the first LBT having succeeded, transmitting the signal via the second bandwidth; on the basis of the first LBT having failed, performing a second LBT for at least one first bandwidth that is some of the plurality of first bandwidths; and on the basis of the second LBT having succeeded, transmitting the signal via the at least one first bandwidth.

Techniques discussed herein can facilitate sidelink (SL) transmissions in the unlicensed spectrum. One example aspect is a baseband processor of a user equipment (UE) including one or more processors configured to perform a first listen before talk (LBT) procedure and a second LBT procedure, where the first LBT procedure is performed according to a first LBT bandwidth (BW) (LBT BW1), and the second LBT procedure is performed according to a second LBT bandwidth (LBT BW2). The one or more processors are further configured to transmit a SL message, in an unlicensed spectrum, after completing the first LBT procedure and the second LBT procedure, where the SL message is transmitted in a SL BWP that overlaps with the LBT BW1 and the LBT BW2.

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 information related to a plurality of carriers; acquiring information related to a plurality of resource block (RB) sets included in a first carrier from among the plurality of carriers; performing listen before talk (LBT) for a first RB set from among the plurality of RB sets; detecting a consistent LBT failure for the first RB set; and transmitting, to a base station, information related to the consistent LBT failure. For example, the information related to the consistent LBT failure can include information related to an index of the first RB set and information related to an index of the first carrier including the first RB set.

A terminal includes: a reception unit configured to perform an LBT (Listen before talk) for a transmission signal in an unlicensed band; and a transmission unit configured to transmit the transmission signal to another terminal in a case where the LBT is successful. When the reception unit receives a channel or a signal that is not a COT initiating transmission from the another terminal during a COT (Channel occupancy time) that is obtained by the another terminal, the transmission unit performs a transmission to the another terminal during the COT.

A node configured for communication in a wireless communication network transmits, following a listen before talk process, at least one transmission within an operating channel bandwidth in response to a sensed energy in the operating channel being less than both a first energy detection threshold (EDT) value determined as a function of the channel bandwidth, and a second predetermined EDT value obtained from the node. The first EDT value is determined as the function of the channel bandwidth and further as a function of a ratio of a maximum transmitter power to an intended transmitter power, the intended transmitter power being less than or equal to the maximum power. When the intended and maximum powers are equal, the first EDT value is determined only as the function of the channel bandwidth. The second energy detection threshold value may be determined as a function of a reference channel bandwidth.

A feedback method, a user equipment, and a storage medium are provided in implementations of the disclosure. In the feedback method, when a data packet of a second user equipment is to be transmitted and the second user equipment receives a listen before talk (LBT) failure indication, the second user equipment sends a negative acknowledgement (NACK) or an acknowledgement (ACK) to a network device on a target physical uplink control channel (PUCCH), where the target PUCCH is a PUCCH corresponding to a first transmission resource used for transmitting the data packet.

A method for performing wireless communication by a first device and a device supporting same are provided. The method may comprise the steps of: obtaining information associated with a recovery timer for recovery of a consistent sidelink (SL) listen before talk (LBT) failure; performing LBT on a RB set; on the basis that the number of failures of the LBT reaches a first threshold, triggering the consistent SL LBT failure; starting the recovery timer; and on the basis that the recovery timer expires, cancelling the triggered consistent SL LBT failure.