422 results about "Listen before talk" patented technology

A communication device that performs sidelink communication using an unlicensed band includes an acquisition unit that acquires information of a resource pool including one or a plurality of sidelink BWPs (Sidelink Bandwidth Parts) and a communication control unit that performs, based on the information of the resource pool, the sidelink communication using the unlicensed band. The one or the plurality of sidelink BWPs are set to correspond to one or a plurality of LBT bandwidths (Listen Before Talk Bandwidths).

Systems, apparatuses, and methods are described for wireless communications. Wireless communications between a base station and one or more wireless devices are described. A wireless device may use power ramping for transmissions and / or retransmissions. Power ramping may be used during a random access procedure. A wireless device may fail a channel access procedure (e.g., a listen before talk procedure) before sending a preamble or a transport block on an unlicensed band. The wireless device may use power ramping to determine a power of transmission of the preamble and / or transport block based on the prior preamble or a transport block transmission. Power ramping may be determined using a power ramping counter value and / or a power ramping step value, which may be shared or associated with the preamble and / or a transport block.

In an example from the perspective of a first User Equipment (UE), in response to performing successful listen before talk (LBT), the first UE determines a channel occupancy time (COT). The first UE determines whether or not a second sidelink transmission, to be performed by a second UE, is within the COT. The first UE determines information, associated with LBT type and / or cyclic prefix (CP) extension, for inclusion in a first sidelink transmission in the COT, wherein whether the information includes first information associated with LBT type and / or CP extension or the information includes second information associated with LBT type and / or CP extension is based on the determination of whether or not the second sidelink transmission is within the COT. The UE transmits, to the second UE, the first sidelink transmission in the COT. The first sidelink transmission includes the information. The second sidelink transmission is associated with the first sidelink transmission.

Methods, systems, and computer programs for enhancing HARQ-ACK timing procedure. In one aspect, a method can include encoding, by a next generation NodeB (gNB), one or more sets of physical downlink shared channels (PDSCHs) with respect to a listen before talk (LBT) operation on an unlicensed spectrum, transmitting, by the gNB, the encoded one or more sets of PDSCHs to the UE, and determining, by the gNB, scheduling for receiving a HARQ-ACK from the UE corresponding to the one or more sets of PDSCHs based on the LBT operation.

The present disclosure provides a method for Side Link (SL) transmission on an Unlicensed band (SL-U), performed by a first terminal device. The method includes: receiving transmission resources for the SL-U transmission allocated by a network device to the first terminal device; performing the SL-U transmission on the transmission resources to a second terminal device; obtaining a Hybrid Automatic Repeat Request, HARQ, acknowledgment associated with the SL-U transmission; configuring a resource for the HARQ acknowledgment; and transmitting the HARQ acknowledgement to the network device on the configured resource, wherein the configured resource is time compensated for Listen Before Talk (LBT) delays occurring during the SL-U transmission and / or during a transmission of the HARQ acknowledgement.

According to embodiments, a user equipment (UE) initiates a channel occupancy time (COT) following a successful listen before talk (LBT) procedure. The UE transmits to a second UE COT information indicating that the COT is sharable. The UE transmits a sidelink (SL) transmission in an unlicensed band within the COT.

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.

Systems and methods for coverage enhancements for sidelink (SL) synchronization signal block (SSB) (S-SSB) between a transmit (Tx) user equipment (UE) and a receive (Rx) UE are disclosed herein. S-SSB frequency domain enhancement may use frequency hopping for S-SSB and / or S-SSB that use an increased number of physical radio bearers (PRBs). S-SSB time domain enhancements may modify an S-SSB periodicity, a number of S-SSB per period, use a clear channel assessment (CCA) (or listen before talk (LBT)) procedure, and / or transmit only some of a configured set of S-SSBs for an S-SSB periodicity. Multi-beam S-SSB enhancement may index S-SSBs of a configured set and send those S-SSBs using beams corresponding to the indexes. S-SSB enhancement using frequency domain masking and / or time domain masking may apply different masks to one or more S-SSBs.

Provided are a method for performing wireless communication by a first device, and an apparatus for supporting same. The method may comprise: obtaining information related to a time duration which a type 2 listen before talk (LBT)-based transmission is performed; triggering a resource selection; determining a selection window based on the resource selection being triggered; and determining a set of sidelink (SL) candidate resources within the selection window based on sensing. For example, a first SL transmission resource among the set of SL candidate resources may selected within the time duration within the selection window.

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 wireless device receives, from a base station, configuration parameters indicating a plurality of bandwidth parts of a cell. Power measurements that indicate a listen before talk (LBT) failure on each of the plurality of bandwidth parts are performed. A radio link failure of the cell is declared in response to the power measurements indicating the LBT failure on each of the plurality of bandwidth parts.

Systems, apparatuses, methods, and computer-readable media are provided for wireless communication using an unlicensed spectrum. An access point (AP) operating in the unlicensed spectrum includes a processor circuitry, a transmitter, and a receiver. The processor circuitry is configured to perform a listen before talk (LBT) procedure using an LBT parameter and a maximum channel occupancy time (MCOT) that is compatible with another wireless protocol using the unlicensed spectrum. The processor circuitry is configured to divide a transport block (TB) into a plurality of code block groups (CBGs) for transmission over the unlicensed spectrum. The transmitter is configured to transmit the plurality of CBGs to a destination, and a receiver is configured to receive hybrid automatic repeat and request acknowledgment (HARQ-ACK) information corresponding to the transmitted plurality of CBGs. The processor circuitry is further configured to determine a HARQ-ACK assessment for the TB based on the HARQ-ACK information corresponding to the transmitted plurality of CBGs, and adjust a contention window size based on the HARQ-ACK assessment for the TB.

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.

Method, apparatus, and systems are disclosed. In one representative embodiment, a method may be implemented by a wireless transmit / receive unit (WTRU) using a channel. The method may include receiving, by the WTRU in a downlink message, a channel transmission trigger (CTT) and selecting, by the WTRU, a type of a Listen Before Talk (LBT) configuration to be performed based on the received CTT. The method may further include determining, by the WTRU in accordance with the type of LBT configuration selected, whether the channel is available for transmission and transmitting data or control information on the channel, on condition that the channel is available for transmission.

This application provides example signal transmission method and apparatus. One example method includes sending, by a first terminal device to a second terminal device, indication information indicating a signal transmission resource. Listen before talk (LBT) is performed by the first terminal device before transmission with the second terminal device is performed. Transmission with the second terminal device is performed by the first terminal device according to the indication information.

A wireless transmit / receive unit (WTRU) may perform a listen before talk (LBT) procedure associated with a sidelink (SL) bandwidth. The SL bandwidth may include a resource block (RB) set. The WTRU may determine a CSLF associated with the RB set of the SL bandwidth based on the LBT procedure. The WTRU may determine a resource for reporting the CSLF, for example, based on a priority rule. The priority rule may indicate that a licensed resource has a higher priority than an unlicensed resource. The priority rule may indicate that, if a consistent LBT failure is not detected on an unlicensed uplink (UL) resource, the unlicensed UL resource has a higher priority than an unlicensed SL resource. The WTRU may send a medium access control (MAC) control element (CE) using the determined resource. In examples, the MAC CE may indicate the RB set.

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.

Various embodiments herein provide techniques related to hybrid automatic repeat request (HARQ) feedback of a new radio (NR) sidelink (SL) transmission. Specifically, in embodiments, a user equipment (UE) may perform, in a first slot of a plurality of slots, a listen before talk (LBT) procedure related to a NR SL transmission. The UE may further identify a subset of two or more candidate slots of the plurality of slots for transmission of a HARQ message related to the LBT procedure. The UE may further transmit the HARQ message in a candidate slot of the two or more candidate slots. Other embodiments may be described and / or claimed.

The invention provides a communication method and device, which are mainly applied to a frequency hopping scene and a condition of coexistence of narrowband transmission and WLAN (Wireless Local Area Network) transmission. Whether listen before talk (LBT) is carried out or not is judged through a transmission time related parameter corresponding to a first channel for transmitting a narrowband signal, and the transmission time related parameter can comprise a first transmission time or a first duty ratio of channel granularity. In a frequency hopping scene, the residence time of the narrowband signal in different channels is shortened, and the interference to WLAN transmission is reduced, so that the coexistence of narrowband transmission and WLAN transmission can be realized, and the LBT frequency of narrowband transmission equipment is reduced, thereby reducing the time delay of narrowband signal transmission and improving the throughput rate of narrowband signal transmission.

A method performed by a first device and a device supporting same in a wireless communication system are provided. The method may include: obtaining discontinuous reception (DRX) configuration information a sidelink (SL) DRX hybrid automatic repeat request (HARQ) round trip time (RTT) timer; receiving, from a base station, a downlink control indicator (DCI) for scheduling a SL resource and a physical uplink control channel (PUCCH) on a physical downlink control channel (PDCCH); based on the SL resource, transmitting, to a second device, a first sidelink control indicator (SCI) for scheduling a physical sidelink shared channel (PSSCH) and a second SCIon a physical sidelink control channel (PSCCH); based on the SL resource, transmitting, to the second device, the second SCI including information related to a SL HARQ process, and data on the PSSCH; performing a listen before talk (LBT) for a PUCCH transmission; and based on that a PUCCH resource is configured, and the PUCCH transmission is not performed due to a LBT failure, starting the SL DRX HARQ RTT timer corresponding to the SL HARQ process in a first symbol after a PUCCH resource for a SL HARQ feedback, in the PUCCH resource.

A wireless device receives a radio resource control (RRC) message indicating a first resource pool of a sidelink (SL) communication. The wireless device determines, from a candidate resource set in the first resource pool, a SL grant indicating resources for one or more SL transmissions of the SL communication. The wireless device receives, by a medium access control (MAC) layer from a physical layer of the wireless device, an indication of SL listen before talk (LBT) failure of a first resource of the resources indicated in the SL grant. Based on the indication, the wireless device selects, for the first resource, a second resource from the first resource pool excluding resources associated with SL LBT failure. The wireless device transmits, via the second resource, the one or more SL transmissions of the SL communication.

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.

A method can include determining, by a wireless device, a first plurality of repetitions of a first preamble scheduled for transmission for a random-access procedure. The method can also include suspending, by a wireless device, a power-ramping counter of a random-access procedure based on not transmitting each repetition of a first plurality of repetitions of a first preamble of the random-access procedure. The method can further include transmitting, by the wireless device, a second preamble with a transmit power that is determined based on the power-ramping counter for the random-access procedure.

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.

Various aspects of the present disclosure relate to techniques for listen before talk failure recovery for sidelink. An apparatus includes at least one memory and at least one processor coupled with the at least one memory. The at least one processor is configured to cause the apparatus to detect a consistent LBT failure on a set of resource blocks RBs, perform at least one LBT on the set of RBs, wherein the LBT is performed based on a reference sidelink SL format, increment a counter in response to determining a success for one of the at least one LBT, wherein the counter is associated with the set of RBs, and, in response to determining that the counter satisfies a predefined threshold, cancel the consistent LBT failure.

Provided are a device and a method for performing sidelink communication in an unlicensed band. The method of a user equipment may include configuring a parameter for detecting a sidelink-specific consistent listen before talk (LBT) failure; detecting a sidelink-specific consistent LBT failure by using the parameter; and transmitting the sidelink-specific consistent LBT failure to a base station.

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.