371 results about "Unlicensed band" patented technology

A method, a user equipment (UE), and a base station for a sidelink operation in unlicensed bands are provided. A UE receives an RRC message, receives a PSSCH in an unlicensed channel, and attempts to transmit a feedback message in a first PSFCH in response to receiving the PSSCH. In a case that the first channel access procedure is not successful, the UE further attempts to transmit the feedback message in a second PSFCH. The RRC message includes a minimum gap between the earliest slot of multiple logical slots of the PSFCHs and a logical slot of the PSSCH, and the logical slots of PSFCHs are assigned for the PSSCH. The UE performs a first channel access procedure in the unlicensed channel before the first PSFCH. The UE performs a second channel access procedure in the unlicensed channel before the second PSFCH.

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).

Various embodiments herein provide techniques for sidelink (SL) communication on unlicensed spectrum. For example, embodiments provide techniques for a physical sidelink feedback channel (PSFCH) and / or a SL synchronization signal block (S-SSB), such as techniques related to a listen-before-talk (LBT) procedure and / or occupied channel bandwidth (OCB) requirements. Other embodiments may be described and claimed.

Provided are a method for performing wireless communication by a first device and an apparatus supporting same. The method may comprise: obtaining information related to at least one resource block (RB) set for physical sidelink feedback channel (PSFCH) transmission; receiving, from a second device, a physical sidelink shared channel (PSSCH); determining a number of PSFCH resources related to the PSSCH; determining an index of an interlaced PSFCH resource among the PSFCH resources, in response to the PSSCH; and performing the PSFCH transmission based on the interlaced PSFCH resource.

A method for performing wireless communication by a first device, and an apparatus supporting same are provided. The method may comprise the steps of: receiving information related to channel occupancy time (COT) from a second device; receiving a first physical sidelink shared channel (PSSCH) from the second device; determining a first PSFCH resource for first physical sidelink feedback channel (PSFCH) transmission related to the first PSSCH; and performing second-type channel access for the first PSFCH transmission within the COT.

Provided are a method by which a first device performs wireless communication and an apparatus supporting same. The method comprises the steps of: acquiring information related to a channel occupancy time (COT), the information related to the COT including information related to a condition for determining whether or not to share the COT; on the basis of whether or not the condition is satisfied, determining a type of channel access; and on the basis of the channel access, determining whether or not to perform sidelink (SL) transmission, wherein the SL transmission may include transmission of first sidelink control information (SCI) for scheduling of a physical sidelink shared channel (PSSCH) and second SCI, via a physical sidelink control channel (PSCCH), and transmission of the second SCI via the PSSCH.

An operation method for a first device (100) in a wireless communication system is presented. The method may comprise the steps of: receiving information about a COT from a second device (200); receiving a plurality of PSSCHs; and determining to use the COT in order to transmit a plurality of PSFCHs related to the plurality of PSSCHs on the basis that a first PSFCH related to a first PSSCH from among the plurality of PSSCHs is transmitted, to the second device (200), from a first resource within a first RB set related to the COT.

A method by which a first device performs wireless communication and a device supporting same are provided. The method may comprise the steps of: acquiring information related to a resource for a sidelink-synchronization signal block (S-SSB); acquiring information about a first time domain for a first cyclic prefix extension (CPE) related to S-SSB transmission; performing the first CPE during the first time domain before the S-SSB transmission; and performing the S-SSB transmission on the basis of the resource.

A first wireless device determines, for transmission of a physical sidelink feedback channel (PSFCH) for a transport block (TB), a plurality of PSFCH transmission occasions associated with the TB, based on: a number of slots between a slot comprising a PSFCH resource and a last slot of reception of the TB, and a periodicity of the slot comprising the PSFCH resource. The first wireless device performs, in response to not transmitting the PSFCH via one or more first PSFCH transmission occasions, a channel access procedure to transmit the PSFCH, via a second PSFCH transmission occasion among the plurality of PSFCH transmission occasions, wherein the second PSFCH transmission occasion occurs after the one or more first PSFCH transmission occasions. The first wireless device transmits, via the second PSFCH transmission occasion and based on performing the channel access procedure, the PSFCH.

A method of wireless communication performed in a shared frequency band at a user equipment (UE) comprises: receiving a sidelink (SL) communication; selecting a channel access configuration for a physical sidelink feedback channel (PSFCH) occasion in a shared frequency band; and transmitting, based on the channel access configuration and the SL communication, a PSFCH communication in the PSFCH occasion in the shared frequency band.

A method for operating a first device (100) in a wireless communication system is proposed. The method may comprise the steps of: obtaining SL synchronization priority information set to GNSS-based synchronization or base station-based synchronization; selecting at least one synchronization criterion on the basis of the SL synchronization priority information; obtaining time synchronization from the at least one synchronization criterion; and transmitting an S-SSB including PSBCH, S-PSS, and S-SSS on an unlicensed band, on the basis of the time synchronization.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure provides a method performed by a first node in a communication system is provided. The method comprising: determining candidate resources on an unlicensed band; and selecting multiple resources from the candidate resources. This method combines advantages of a channel sensing used to avoid interference within system on the licensed band and a LBT technology used to avoid interference from other communication systems on the unlicensed band, so that a UE can select resources with better performance on the unlicensed band and minimize interference to other communication systems.

Disclosed are methods for allocating spectrum by a Mobile Satellite Service (MSS) satellite to a User Equipment (UE). The method includes monitoring, by the MSS satellite, radio spectrum in a coverage area of the MSS satellite, determining a spectrum usage map of the radio spectrum in the coverage area, where the spectrum usage map comprises frequency bands comprising licensed frequency bands and unlicensed frequency bands, and transmitting the spectrum usage map for use by the UE. Related wireless electronic devices are also discussed.

A wireless UE that operates in a sidelink unlicensed band in a wireless communication system may include at least one antenna configured to transmit and receive one or more wireless signals, at least one processor, and a memory configured to store instructions for the wireless UE when executed by the at least one processor, and the operation of the wireless UE may include determining the number of OFDM symbols available for PSSCH transmission; determining the number of coded symbols of 2nd SCI based on the number of OFDM symbols available for PSSCH transmission; determining the number of resource elements of 2nd SCI based on the number of coded symbols of 2nd SCI; and mapping the 2nd SCI to radio resources based on a parameter related to a starting OFDM symbol location and a parameter related to the number of OFDM symbols and transmitting the same to another wireless UE.

A method of configuring a sidelink resource pool in a user equipment (UE) in a wireless communication system may include receiving, by the UE, resource pool configuration information from a base station based on higher layer signaling; transmitting sidelink control information (SCI) to another UE based on the resource pool configuration information; and performing sidelink communication with the other UE, and the resource pool configuration information may be information that is based on sidelink resource pool configuration of an unlicensed band.

A wireless device receives configuration parameters indicating: a sidelink resource pool of a sidelink bandwidth part configured in a shared spectrum, one or more resource blocks for a physical sidelink feedback channel transmission via the sidelink resource pool, and a first common interlace index, among a plurality of common interlace indexes, configured for the PSFCH transmission via the sidelink resource pool. The wireless device determines multiple common RBs of a first common interlace corresponding to the first common interlace index. An index of each of the multiple common RBs is based on: an interlaced RB index corresponding to the first common interlace index, and a first common RB index indicating a starting RB of the sidelink BWP. The wireless device transmits, during a PSFCH slot, one or more sidelink transmissions via at least one RB of the one or more RBs, and via the multiple common RBs.

A wireless device selects, based on a sidelink (SL) selection window for SL resource selection, a first multi-slot resource from among a set comprising multi-slot candidate resources in a SL resource pool. The first multi-slot resource comprises a plurality of SL slots. The wireless device determines a random number, between zero and a value of a contention window, as an initial value of a counter for a type 1 channel access procedure. The wireless device senses, after a value of the counter is zero, a channel to be idle. The wireless device transmits, to a second wireless device and via the first multi-slot resource, a second stage SL control information (SCI) comprising an SCI format 2-A. The SCI format 2-A indicates a duration of a channel occupancy time (COT). The COT is initiated, by the wireless device, based on sensing the channel to be idle.

A method executed by a User Equipment (UE) operating in a Frame-Based Equipment (FBE) mode is provided. The method includes the following steps: determining a starting time and a periodicity of a first Fixed Frame Period (FFP) of a cell on an operating channel of an unlicensed band; determining a starting time and a periodicity of a second FFP for initiating an uplink transmission to the cell; performing a Listen-Before-Talk (LBT) procedure on the operating channel of the unlicensed band; and performing the uplink transmission to the cell using a first uplink resource in the second FFP in response to the LBT procedure indicating that the operating channel of the unlicensed band is clear.

Provided are a method for a first device carrying out wireless communication, and a device supporting same. The method may comprise the steps of: acquiring information related to a plurality of physical sidelink feedback channel (PSFCH) occasions; acquiring information related to a slot offset between PSFCH-physical uplink control channel (PUCCH); transmitting, to a second device via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling second SCI and a physical sidelink shared channel (PSSCH); transmitting the second SCI and data to the second device via the PSSCH; generating HARQ feedback information for the plurality of PSFCH occasions; and reporting the HARQ feedback information to a base station on the basis of a PUCCH resource.

A method by which a first device performs wireless communication and an apparatus supporting the method are provided. The method may comprise the steps of: acquiring information related to a resource block (RB) set in which a channel access procedure is performed in a shared spectrum, acquiring a threshold for adjusting a transmission parameter; performing channel sensing on the RB set; determining the transmission parameter on the basis of a result of the channel sensing for the RB set and the threshold; and performing sidelink (SL) communication with a second device on the basis of the transmission parameter.

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 method of configuring a sidelink resource pool to a user equipment (UE) in a wireless communication system may include receiving, by the UE, resource pool configuration information based on higher layer signaling from a base station; transmitting sidelink control information to another UE based on resource pool configuration information; and performing sidelink communication with the other UE, and resource pool configuration information may be information based on sidelink resource pool configuration of an unlicensed band.

A wireless user equipment (UE) in a wireless communication system may be configured with at least one hybrid automatic repeat and request (HARQ) feedback transmission opportunity, may transmit HARQ feedback based on the configured at least one HARQ feedback transmission opportunity, may operate a sidelink discontinuous reception (DRX) HARQ round trip time (RTT) timer based on the HARQ feedback transmission, and may receive a retransmission grant if the sidelink DRX HARQ RTT timer expires.

A method by which a first device performs wireless communication, and a device supporting same are provided. The method may comprise the steps of: transmitting, to a second device, through a physical sidelink control channel (PSCCH), first sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) and second SCI; transmitting, to the second device, through the PSSCH, the second SCI or a first medium access control (MAC) control element (CE); receiving, from the second device, information related to a channel occupancy time (COT) in response to auxiliary information for generating the COT; and performing, within the COT, sidelink (SL) communication on the basis of type 2 channel access.

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.

The embodiment of the invention discloses an unlicensed frequency band conflict modeling and backoff optimization method and device based on a graph neural network, and aims to solve the conflict problem when multiple devices share a frequency spectrum in an unlicensed frequency band. The method comprises the steps of collecting and preprocessing multi-dimensional information of wireless equipment, constructing a time-space associated conflict graph, predicting a conflict probability by using a graph attention network, optimizing a backoff strategy through multi-agent reinforcement learning, and feeding back and updating a model in real time. The device comprises a data acquisition unit, a data processing unit, a graph construction unit, a conflict modeling unit, a strategy optimization unit and a feedback optimization unit. Through integration of the graph neural network and multi-agent reinforcement learning, precise modeling of conflicts and adaptive optimization of a backoff strategy are realized, the spectrum utilization rate and the system throughput on an unlicensed frequency band are significantly improved, the probability of conflicts between devices is reduced, and the method is suitable for high-density wireless communication scenes such as the Internet of Things and smart home.

Systems, methods, and devices for efficient and robust handling of acknowledgements in new radio unlicensed bands (NR-U) environments. A wireless transmit receive unit (WTRU) may receive control information and a data transmission from a gNB in a first interval (i.e., transport block or channel occupancy time), wherein the control information may include an indication of uplink resources. The data transmission may require some sort of acknowledgement (i.e., HARQ feedback). The WTRU may attempt to transmit the acknowledgement in the indicated uplink resources, but the gNB may not receive the acknowledgement. The WTRU may receive control information and a data transmission from the gNB in a second interval, including an indication to aggregate any previously unsuccessful acknowledgement transmissions. The WTRU may transmit an aggregated acknowledgement including previous unsuccessful acknowledgements and any additional acknowledgements from the current interval. In some cases, look-before-talk procedures may be used.

A wireless transmit / receive unit (WTRU) may receive downlink control information (DCI) scheduling a sidelink (SL) grant that indicates a time window to initiate a channel occupancy time (COT). The WTRU may perform listen-before-talk (LBT) to access an SL unlicensed channel in an unlicensed band within the indicated time window to initiate the COT. After a successful channel access outcome of the performed LBT, the WTRU may transmit uplink control information (UCI) to a base station. The UCI may indicate the successful channel access outcome and a COT starting time within the indicated time window to initiate the COT. Also, the UCI may further indicate an intended number of transmissions by the WTRU in the COT. Moreover, the UCI may further indicate reserved sub-channels, reserved interlaces, or both, within the COT. Additionally, based on a buffer status and the COT starting time, the WTRU may determine whether to share the COT.

A method of a first radio node. The method includes: transmitting, from the first radio node, sidelink position reference signal configuration defining at least one position reference signal to be transmitted from a first radio node to the second radio node; generating at least one position reference signal as defined by the SPRS configuration transmitted to the second radio node; performing channel contention for the purpose of position reference signal transmission in a bandwidth range at least partially included in an unlicensed radio band, wherein the contention is performed using a listen before talk mechanism; based on a positive result of the channel contention, accessing the channel for the duration of a channel on time; and transmitting the at least one position reference signal to the second radio node during the channel on time.

Embodiments of the present disclosure relate to method, device and computer readable media for communications. A first device performs a first type LBT procedure in unlicensed band. In response to a successful performing of the first type LBT procedure, the first device transmits, to a second device, a first sidelink positioning reference signal (PRS) sequence in the unlicensed band for ranging between the first device and the second device, and / or for positioning of the first device. The first sidelink PRS sequence is associated with the first type LBT procedure and / or a second type LBT procedure to be performed by the second device for transmitting a second sidelink PRS sequence in the unlicensed band to the first device for the ranging or the positioning.