695 results about "Random-access channel" patented technology

During a random access (“RA”) procedure associated with a network node of a new radio (“NR”) communications network, a communication device can determine information associated with at least one of the communication device and a channel between the communication device and the network node. The communication device can further determine a number of physical RA channel (“PRACH”) transmissions to transmit to the network node prior to receiving a random access response as part of the RA procedure based on the information. The communication device can further transmit the number of PRACH transmissions to the network node as part of the RA procedure.

A method, network node and wireless device (WD) for a physical random access channel (PRACH) for subband full duplex operation are disclosed. According to one aspect, a wireless device configured to communicate with a network node is provided. The wireless device is configured to receive frequency domain configuration information and time domain configuration information indicating a plurality of subband full duplex, SBFD, symbols and a plurality of uplink-, UL-, only symbols in a time division duplex, TDD, configuration, and determine a validity of a random access channel, RACH, occasion, RO, based on whether a validity condition is met, the RO being positioned in at least one SBFD symbol of the plurality of SBFD symbols or in at least one UL-only symbol of the plurality of UL-only symbols.

A method may include a wireless device receiving resource control (RRC) messages comprising configuration parameters of a layer 1 / layer 2 triggered mobility (LTM) and a configured grant Type 1 for one or more physical uplink shared channel (PUSCH) transmissions of a random access channel (RACH)-less LTM cell switch. The method may also include receiving a medium access control (MAC) control element (CE) triggering an LTM cell switch procedure for the RACH-less LTM cell switch. The method may also include determining not to initiate a random access (RA) procedure based on the RACH-less LTM cell switch being ongoing. The method may also include, based on the RACH-less LTM cell switch being ongoing, not initiating the RA procedure. The method may also include transmitting, using the configured grant Type 1 and for the RACH-less LTM cell switch, a first PUSCH transmission of the one or more PUSCH transmissions.

A terminal according to an aspect of the present disclosure includes: a control section that makes determination of repetition of a random access channel assuming that the repetition of the random access channel is necessary when a condition is met; and a transmission section that performs, upon the determination, the repetition of the random access channel to a base station in accordance with a configuration on the repetition of the random access channel from the base station.

Methods, devices, and systems for providing early timing advance (TA) acquisition are provided. A radio resource control (RRC) configuration of the early TA acquisition is received from a base station. A PDCCH order to trigger a random access channel (RACH) procedure toward a candidate cell is received from the base station. The RACH procedure for the early TA acquisition is initiated based on the received RRC configuration and PDCCH order. A preamble with a calculated transmission power on the candidate cell is transmitted to the base station.

Methods and apparatuses for early indication for initial access in full-duplex systems. A method for operating a user equipment (UE) includes receiving a system information block (SIB1) including configuration information, identifying, based on the configuration information, a random access channel (RACH) configuration, and identifying, based on the configuration information, an early access indication associated with a full-duplex operation. The method further includes determining to use a first random access transmission configuration if a condition for the early access indication associated with the full-duplex operation is met or a second random access transmission configuration if the condition is not met and transmitting a random access message using the determined first or second random access transmission configuration.

Wireless communications systems and methods are provided for validating a physical uplink shared channel (PUSCH) occasion defined for 2-step random access channel (RACH) in case of collisions. For example, the user equipment (UE) may determine whether a collision occurs between the PUSCH occasion for the 2-step RACH and any RACH occasion assigned for either 2-step RACH or 4-step RACH after receiving the RACH configuration or updates from the network. The UE may then exclude the PUSCH occasion from the resource pool for 2-step RACH when a collision occurs.

A wireless communication method and / or apparatus is disclosed. The method comprises receiving, by a wireless communication terminal from a network node, configuration information for a handover procedure without a Random Access Channel, RACH procedure; initiating, by the wireless communication terminal, the handover procedure without a RACH procedure according to the configuration information; and transmitting, by the wireless communication terminal to a wireless communication node, uplink, UL, data for the handover procedure without a RACH procedure according to the configuration information.

A control method for a network-controlled repeater includes: determining that the repeater transmits a physical random access channel to the base station, in which the physical random access channel is configured to recover a control link between the repeater and the base station; and causing the repeater to cease forwarding a signal between the base station and a user equipment. Causing the repeater to cease forwarding the signal may include causing the repeater to cease forwarding the signal between the base station and the user equipment on all carrier components or selected carrier components.

Certain aspects of the present disclosure provide techniques for dynamic synchronization signal configuration and random access. A method for wireless communication by a user equipment may include receiving a first SSB configuration indicating a plurality of SSB transmissions and determining, based on the first SSB configuration, random access occasions of a set of ROs as valid or invalid and physical uplink shared channel occasions of a set of POs as valid or invalid. The method may include receiving an updated SSB configuration and re-determining, based on the updated SSB configuration, whether the ROs of the set of ROs are valid or invalid and whether the POs of the set of POs are valid or invalid. The method may include transmitting in the set of ROs and the set of POs based on the determination of the valid or invalid ROs and the valid or invalid POs.

Disclosed are a method and a device for uplink transmission and reception in a wireless communication system. A method performed by a wireless communication system according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, first configuration information related to physical random-access channel (PRACH) preamble repeated transmission; and performing first PRACH preamble repeated transmission in first multiple random-access channel occasions (ROs) one basis of the first configuration information, wherein a power of the first PRACH preamble repeated transmission performed across the first multiple ROs is based on a first reference signal (RS) for acquiring of a path-loss value, and transmission power ramping is not be applied within the first multiple ROs.

A user equipment (UE) may receive an unsourced random access (URA) common resource pool configuration. The URA common resource pool configuration may include an indicator of a plurality of sparse patterns. The UE may select a sparse pattern from the plurality of sparse patterns. The UE may transmit a URA message based on the selected sparse pattern. The URA message may include user data different from a 2-step or a 4-step random access channel (RACH) message. A plurality of UEs may transmit URA messages to a network node based on the URA common resource pool configuration, where each UE may transmit a URA message based on one of the sparse patterns from the plurality of sparse patterns of the URA common resource pool configuration.

The present disclosure provides preamble sequence sending and receiving methods and apparatuses and a storage medium. The method includes: determining M random access channel occasions (ROs) based on detected synchronization signal blocks (SSBs), where M is an integer greater than 1; and sending preamble sequences on the M ROs, where the preamble sequences carry additional bits generated based on informational bits, thereby improving the performance of preamble sequences.

A wireless device receives one or more radio resource control (RRC) messages indicating an uplink configured grant configuration for a random access channel (RACH)-less layer-1 / layer-2 triggered mobility (LTM) cell switch. The uplink configured grant configuration associates synchronization signal blocks (SSBs) to physical uplink shared channel (PUSCH) occasions. The wireless device triggers a conditional LTM cell switch to a candidate cell based on a reference signal, of the candidate cell, fulfilling a condition. The wireless device transmits, on the candidate cell and via a PUSCH occasion of the PUSCH occasions, a PUSCH transmission. The PUSCH occasion is associated with an SSB that is the same as, or associated with, the reference signal.

A method and a device for a random-access procedure in an SBFD subband are disclosed. This method of a user equipment (UE) comprises the steps of: receiving power control information from a base station; determining, on the basis of the power control information, a first transmission power for first transmission of a random-access (RA) preamble in a first random-access channel (RACH) occasion (RO); performing the first transmission of the RA preamble in the first RO on the basis of the first transmission power; determining, on the basis of the power control information, a second transmission power for second transmission of the RA preamble in a second RO; and performing the second transmission of the RA preamble in the second RO on the basis of the second transmission power.

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for beam refinement. One aspect provides a method for wireless communications at a user equipment (UE). The method includes: receiving, from a base station (BS), a set of synchronization signal blocks (SSBs) associated with a set of beams, respectively; transmitting, to the BS, a first message of a random access channel (RACH) process using one beam of the set of beams; receiving, from the BS, a second message of the RACH process, wherein the second message triggers a beam refinement process; and receiving a set of reference signals as part of the beam refinement process to identify one or more candidate refined beams.

A random access signal transmission method, a terminal, and a non-transitory computer-readable storage medium are provided. The random access signal transmission method includes: determining a target time range according to a time domain position of a target downlink signal within a fixed frame period; and determining a Random Access Channel (RACH) occasion intersected with the target time range within the fixed frame period as an invalid RACH occasion according to configuration information of the fixed frame period and configuration information of the RACH occasion.

Various aspects of the present disclosure relate to transmitting a configuration that indicates a mapping between a synchronization signal block (SSB) transmission to a random-access channel occasion (RO), where the mapping is according to whether the SSB transmission is for a near-field region associated with an antenna array or for a far-field region associated with the antenna array. Aspects of the present disclosure relate to transmitting a plurality of SSB bursts based at least in part on the configuration, where the plurality of SSB bursts comprises a first SSB burst and a second SSB burst, the first SSB burst comprising a first set of SSBs associated with a first set of beams for the near-field region, and the second SSB burst comprising a second set of SSBs associated with a second set of beams for the far-field region.

A method and apparatus for non-terrestrial network (NTN) coverage extension is provided. A user equipment (UE) transmits an indication of UE capability for physical uplink control channel (PUCCH) repetitions of a fourth message (Msg4) hybrid automatic repeat request-acknowledgement (HARQ-ACK) transmission in a random access channel (RACH) procedure to a network node of the NTN. The UE determines a trigger for PUCCH repetitions of the Msg4 HARQ-ACK transmission during the RACH procedure. In response to the trigger, the UE transmits one or more Msg4 HARQ-ACK repetitions from the UE to the network node.

A user device, UE, for a wireless communication network, is connectable to two or more of a plurality of network slices of the wireless communication network, wherein a slice specific random access channel, RACH, resource configuration is associated with one or more of the plurality of slices. Responsive to a first RACH event associated with a first slice, the UE is to determine whether there is an ongoing RACH procedure triggered by a second RACH event associated with a second slice. In case of an ongoing RACH procedure, the UE is toprohibit an additional RACH procedure triggered by the first RACH event associated with the first slice, and / orsuspend the additional RACH procedure for a certain time, and / orstop the ongoing RACH procedure and start the additional RACH procedure, and / ormodify the ongoing RACH procedure, and / ormodify the ongoing RACH procedure to start the additional RACH procedure.

A random access method is executed by a terminal that supports a physical random access channel (PRACH) repetition. The random access method includes: determining a number of times for sending a first random access message; determining one or more target random access channel (RACH) occasions (ROs) with a quantity equal to the number of times from one or more candidate ROs; and sending the first random access message to a network device at the one or more target ROs.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, configuration information indicating a downlink initial access signal (IAS) to random access channel (RACH) occasion association pattern, wherein the downlink IAS to RACH occasion association pattern indicates at least one of switching gaps between downlink IAS occasions and between RACH occasions or guard bands between RACH occasions. The UE may transmit, to the base station, a RACH message using a RACH occasion according to the downlink IAS to RACH occasion association pattern. Numerous other aspects are described.

Various aspects of the present disclosure relate to an ambient Internet of things (AIoT) device reader with at least one memory and at least one processor coupled with the at least one memory and configured to cause the reader to transmit a configuration to at least one AIoT device, the configuration indicating a duty cycle associated with a at least one characteristic of the at least one AIoT device, and receive, within an inventory round, an inventory message from the at least one AIoT device having the at least one characteristic in a random access channel (RACH) occasion of the duty cycle.

Systems, methods, apparatuses, and computer program products for improved handling of cross-link interference on physical random access channel occasions on flexible or full duplexing slots are provided. For example, a method can include providing a plurality of random access channel configurations to a user equipment. A first random access channel configuration of the plurality of random access channel configurations can be for a first set of symbols or slots and a second random access channel configuration of the plurality of random access channel configurations can be for a second set of symbols or slots. The method can also include providing, to the user equipment, one or more parameters configured to steer the user equipment to select between the first set of symbols or slots or the second set of symbols or slots to be used when performing a random access transmission. The method can further include receiving a random access transmission on the selected set of symbols or slots based on one of the plurality of random access channel configurations.

A method may include receiving, by a wireless device and via a first cell, a layer 1 / layer 2 trigger mobility (LTM) cell switch command indicating an LTM cell switch to a second cell and a random access channel (RACH)-less LTM cell switch to the second cell. The method may also include applying, after a time duration from a transmission occasion of a physical uplink control channel (PUCCH) for the LTM cell switch command, a first TCI state to the second cell. The time duration is based on a radio resource control (RRC) processing time; and synchronization signal block (SSB) measurement window for receiving, from the second cell, a first SSB transmission using the first TCI state. The method may also include transmitting, via the second cell, first uplink transmissions using the first TCI state until the wireless device receives an activation command indicating a second TCI state.

Described herein is a A User Equipment, UE, comprising: at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the UE at least to: receive, before or when entering a Radio Resource Control, RRC, inactive state, from a network node, configuration information associated with a plurality of candidate cells for the UE to perform a Random Access Channel less, RACH-less access, the configuration information being further associated with a state transition of the UE from the RRC inactive state to an RRC connected state, wherein the plurality of candidate cells comprises a last serving cell of the UE before the state transition and / or one or more neighboring cells of the last serving cell, wherein the configuration information comprises Timing Advance related, TA-related configurations for determining a Timing Advance, TA, value at least for a target cell from the plurality of candidate cells, wherein the target cell is the last serving cell or one of the neighboring cells, wherein the UE is further configured to, while in the RRC inactive state: determine to transition from the RRC inactive state to the RRC connected state in response to an indication relating to data associated with the target cell; determine, for the target cell, the TA value based on the TA-related configurations; and perform the RACH-less access to the target cell based on the determined TA value for the target cell.

The present application relates to devices and components including apparatus, systems, and methods for initial access and random access channel operations for reduced capability devices in wireless networks.

A UE that controls physical random access channel (PRACH) transmission power is provided. The processor of the UE is configured to select a random access (RA) channel occasion (RO) from several ROs associated with a single synchronization SS / PBCH block; determine whether the RO is within a subband full duplex (SBFD) region in time domain; if the RO is fully within the SBFD region: select a first preamble received target power and determine a current PRACH transmission power based on the first preamble received target power; if the RO is fully outside the SBFD region: select a second preamble received target power, where the second preamble received target power is different from the first preamble received target power; and determine the current PRACH transmission power based on the second preamble received target power; and transmit, to a BS, an RA preamble in the RO at the current PRACH transmission power.

A method includes determining, by a user device in a wireless network, at least one starting random access channel occasion (RO), wherein each of the at least one starting RO is a first valid RO of an RO set for a physical random access (PRACH) transmission with preamble repetitions, wherein the determining the at least one starting RO is based at least on valid ROs; determining, by the user device, an RO set for the PRACH transmission with preamble repetitions based on the determined at least one starting RO, the determined RO set including one of the at least one starting RO; and transmitting, by the user device to a network node, the PRACH transmission with preamble repetitions using the determined RO set.

In general, the present subject matter relates to prioritizing random access channel layer-less (RACH-less) Layer 1 / Layer 2 triggered mobility (LTM). In some implementations, prioritizing RACH-less LTM may include receiving, at a serving distribution unit (DU) of a base station, information indicating RACH-less handover configurations for multiple LTM target cells of the base station or timing advance information for each of the multiple LTM target cells from an aggregation unit control plane of the base station; identifying, at the serving DU, at least one target cell to which a RACH-less handover of a service for a user equipment (UE) may be performed based on the received information; and selecting, at the serving DU, one of the identified at least one target cell for handover from the serving DU of the service for the UE and triggering a handover of the service to the selected target cell.