86 results about "Random-access channel" patented technology

Certain aspects of the present disclosure provide techniques activating one or more subsets of additional random access channel (RACH) occasions. An exemplary method performed by a user equipment (UE) includes receiving first RACH configuration information configuring a plurality of RACH configuration periods and a plurality of legacy RACH occasions (ROs), receiving second RACH configuration information configuring a plurality of additional ROs, wherein second RACH configuration information defines the plurality of additional ROs relative to the plurality of legacy ROs, receiving downlink control information (DCI) indicating a set of additional ROs from the plurality of additional ROs and a subset of additional ROs that are activated, in the indicated set of additional ROs, for use by the UE, and transmitting a RACH transmission in at least one legacy RO of the plurality of legacy ROs or in at least one additional RO of the subset of additional ROs.

Methods, systems, and devices for wireless communications are described. The described techniques may allow for a network entity to indicate to a user equipment (UE) to use a subband full-duplex (SBFD) random access channel (RACH) configuration or a time division duplex (TDD) PRACH configuration. For example, a control message (e.g., a downlink control information (DCI) or radio resource control (RRC) message) may include a bitfield that indicates which PRACH configuration for the UE to use. Additionally, or alternatively, the UE may select a PRACH configuration based on a capability of the UE to perform the SBFD PRACH configuration, or based on a PRACH configuration indicating RACH occasions that are earliest in time. Additionally, or alternatively, the PDCCH order message may indicate for the UE to transmit the first message multiple times via one or both of the SBFD PRACH configuration or the TDD PRACH configuration.

The present disclosure relates to a random access process in which a terminal: receives i) a random access channel (RACH) occasion (RO) type RSRP threshold and ii) message 1 (Msg1) repetition number RSRP thresholds; chooses a specific RO type on the basis of the RO type RSRP threshold; and determines the number of Msg1 repetitions on the basis of an Msg1 repetition number RSRP threshold related to the specific RO type.

The present disclosure relates to a configuration method, device, system, storage medium and program product. The method comprises: receiving first information sent by a network device, the first information being used for configuring a plurality of random access channel (RACH) resource configuration information; and receiving second information sent by the network device, the second information being used for indicating, in the plurality of RACH resource configuration information, a random access occasion (RO) type associated with each RACH resource configuration information. According to the second information, the terminal can learn the RO type associated with the plurality of RACH resource configuration information configured by the network device, so that different RACH resource configuration information can be reasonably applied based on the RO type, and the communication performance is improved.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive an indication of a configuration for multiple sets of prioritization parameters for a random access channel (RACH) procedure. A first set of prioritization parameters of the multiple sets of prioritization parameters may be associated with a higher priority network slice than the other sets of prioritization parameters (e.g., than the remaining sets of prioritization parameters). The UE may detect a trigger to perform a RACH procedure and select the first set of prioritization parameters for the RACH procedure based on the first set of prioritization parameters being associated with the higher priority network slice. The UE may perform the RACH procedure for the network slice according to the first set of prioritization parameters.

The application provides a communication method and a communication device, and relates to the field of communication. The method comprises the following steps: receiving a first synchronization signal block (SSB), the first SSB being associated with multiple system message blocks (SIBs); receiving a first SIB in the multiple SIBs according to the first SSB, wherein the first SSB and / or the first SIB carries first information, the first information is used for determining a first random access channel (RACH) occasion (RO) resource specific to the first SIB, and the coverage range of the first SIB is smaller than the coverage range of the first SSB; determining the first RO resource according to the first information; and sending a random access channel (RACH) on the first RO resource. According to the embodiment of the application, the RO resource is independently configured for the multiple SIBs associated with the SSB, or in other words, one SSB is associated with multiple RO resources, so that the terminal devices covered by different SIBs can initiate random access by using different resources, which helps to reduce the probability of random access conflict, thereby helping to improve the access capacity of the system.

The wireless communication system (100) uses DNNs or other neural networks (118, 130, 138, 146) to provide the RACH technique. The TX DNN (118) of the user equipment (UE) (108) generates and transmits a random access (RA) signal (124) wirelessly to the base station (BS) 110. The BS (110) receives the RA signal (124) as an input and, from this input, generates an RA response signal (150) for wireless transmission to the UE (108).

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit first repetitions of a physical random access channel (PRACH) preamble during first random access channel (RACH) occasion (RO) groups, where the first RO groups include a first set of ROs that are mapped to a synchronization signal block (SSB). The UE may receive control information that activates a second set of ROs, where the second set of ROs are mapped to the SSB. The UE may transmit, after activating the second set of ROs, second repetitions of the PRACH preamble during second RO groups that include the first set of ROs and the second set of ROs, and where a starting time to begin forming the second RO groups is in accordance with RO grouping rules. Numerous other aspects are described.

This application provides a random access method, apparatus, and storage medium for reducing access latency and improving initial access performance. The method includes: determining a first CC from the plurality of CCs based on the random access channel timing (RO) waiting time corresponding to each of the plurality of carrier components (CCs), wherein the RO waiting time of each CC is the time interval between the time unit where the RO of the CC is located and the current time unit; and initiating random access through the RO of the first CC.

Embodiments of the present application provide a communication method and a communication apparatus. The method comprises: a terminal device receiving resource configuration information, the resource configuration information including information of K resource sets, the K resource sets being in one-to-one correspondence with K coverage levels, and the K resource sets corresponding to M random access channel formats, wherein each resource set corresponds to one of the random access channel formats, the M random access channel formats include a first random access channel format and a second random access channel format, the two formats correspond to different numbers of occupied frequency domain resource units, and K and M are positive integers; the terminal device determining a first coverage level corresponding to the terminal device, the first coverage level corresponding to a first resource set among the K resource sets; and on at least one random access resource in the first resource set, sending a random access request message using a random access channel format corresponding to the first resource set. The method can not only improve resource efficiency, but also ensure the reliability of a communication link.

This disclosure provides systems, methods, and apparatus for determining a target base station timing advance value between a user equipment (UE) and a target base station in conjunction with a handover procedure without a random access channel (RACH). In one aspect, the UE may determine the target base station timing advance based at least in part on a timing difference between the target base station and the source base station and at least in part on timing offsets associated with the UE's uplink and downlink. In some aspects, the target base station may use the UE's uplink reference signal to determine the timing advance. In some aspects, the UE may report the timing difference between the target base station and the source base station, and the source cell may determine the timing advance based at least in part on the timing difference.

The present application provides a handover processing method and device, wherein a handover processing method comprises: determining, by a processor of a device, a first part of a handover processing and a second part of the handover processing, wherein the second part of the handover processing will cause interruption with a source network node; determining, by the processor, a random access channel occasion (RO) of a target network node; and performing, by the processor, the second part of the handover processing after the first part of the handover processing and immediately before the RO. By using the present application, the handover can be better performed.

This disclosure provides systems, methods, and devices for wireless communication that support configuring associations between system information of at least one downlink (DL) anchor carrier and at least one random access channel (RACH) occasion (RO) of an uplink (UL) anchor carrier for initial access in flexible multicarrier operations. System information may be transmitted by a base station to a UE over the DL anchor carrier. In aspects, the at least one DL anchor carrier may be mapped to an UL anchor carrier, or to one or more candidate UL anchor carriers from which the UE may configurably select the UL anchor carrier, for initial access operations. In aspects, the UL anchor carrier and / or the one or more candidate UL anchor carriers may be respectively associated with one or more ROs. The UE may perform initial access operations over the UL anchor carrier using the associated one or more ROs.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may initiate a first random access channel (RACH) procedure with a serving cell of the UE. The UE may receive, prior to terminating the first RACH procedure, a trigger for a second RACH procedure with a candidate cell of the UE. The UE may initiate the second RACH procedure with the candidate cell. Numerous other aspects are described.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network node, a default physical random access channel (PRACH) configuration that indicates one or more default PRACH resources. The UE may receive, from the network node, an additional PRACH configuration that configures one or more additional PRACH resources. The UE may receive, from the network node, a physical downlink control channel (PDCCH) order that initiates a random access channel (RACH) procedure and indicates a subset of the one or more additional PRACH resources to activate. The UE may transmit, to the network node, a PRACH message using a PRACH resource selected from the one or more default PRACH resources and the subset of the one or more additional PRACH resources in accordance with the PDCCH order. Numerous other aspects are described.

A user equipment (UE) may implement a method for managing uplink synchronization during a cell handover without a random access channel triggered by lower-layer signaling. The method includes: communicating with a radio access network (RAN) via a serving cell; receiving a command to perform a lower-layer triggered mobility (LTM) handover to a candidate cell; applying a timing advance (TA) value to uplink (UL) synchronization with the candidate cell; and maintaining the UL synchronization based on the TA value after the LTM handover to the candidate cell is completed.

A wireless communication method, an ambient energy AMP device, and a network device are disclosed. The method includes: the ambient energy AMP device receiving a first signal sent by the network device, the first signal being used to determine resources for a random access channel; and the AMP device sending a random access channel to the network device based on the first signal.

Various aspects of the present disclosure generally relate to wireless communication. Some aspects more specifically relate to a user equipment (UE) mapping a first set of random access channel (RACH) occasions (ROs) associated with half duplex operations to a set of synchronization signal blocks (SSBs) and identifying a subset of ROs from the first set of ROs that are not mapped during the mapping of the first set of ROs. The UE may reallocate one or more ROs of the subset of ROs from the first set of ROs to a second set of ROs associated with full duplex operations. In accordance with reallocating the one or more ROs, the UE may map the second set of ROs associated with full duplex operations to the set of SSBs. That is, the one or more ROs reallocated to the second set of ROs may be mapped to the set of SSBs.

This application relates to the field of communications and proposes a method, apparatus, electronic device, and storage medium for configuring a random access channel. The method for configuring a random access channel includes: receiving a Radio Resource Management (RRC) message, wherein the RRC message carries association information between a Service Block (SSB) and a Random Access Type (RA-TYPE), the RA-TYPE including a 2-step random access RA and a 4-step RA; determining the SSB to be configured; determining the RA-TYPE to be configured based on the association information between the SSB and the RA-TYPE; and completing the configuration of the random access channel based on the SSB and the RA-TYPE. Applied in contention-based random access (CBRA) processes, this method achieves the goals of beam-based random access channel configuration, improved system access success rate, and reduced latency.

A method for satellite handover of non-terrestrial networks, a terminal device, and a network device are provided. One example method includes: receiving a first handover command from a first satellite network, wherein the first handover command includes first information, a pre-allocated grant, and a beam index for access associated with a synchronization signal block (SSB) to be used at a second satellite network; and determining, based on the first information, a first resource for an uplink transmission to a second satellite network during a satellite handover from a coverage area of the first satellite network to a coverage area of the second satellite network, wherein the satellite handover comprises at least one of a random access channel-less (RACH-less) handover or a conditional handover (CHO).

The application discloses a configuration method, device and system in a random access process, solves the problem that the random access capacity is limited because the demodulation reference signal port of the third message is fixedly configured, and cannot utilize the number of concurrent terminals. The method comprises the following steps: receiving a first message, the first message containing at least two random access request messages; determining the number of concurrent accesses according to the first message; determining the number of demodulation reference signal ports according to the number of concurrent accesses; generating and sending a second message, the second message containing uplink authorization, the uplink authorization carrying demodulation reference signal port number indication information; receiving a third message. Through the dynamic adaptation of the number of demodulation reference signal ports, the efficient utilization of the random access channel resource and the significant optimization of the access delay are realized, and the method is especially suitable for the 5G evolution and 6G communication system using large-scale antenna arrays and artificial intelligence technology.

A user equipment (UE) (201) is disclosed herein. The UE is configured to receive a layer 1 / layer 2 triggered mobility (LTM) cell handover command without random access channel (RACH) from a source gNB-DU (203). The UE is further configured to transmit a first UL data packet to a target gNB-DU (205) via one of a configured UL scheduling grant and a dynamic UL scheduling grant to indicate a successful LTM cell handover without RACH. The UE is configured to transmit a SR to the target gNB-DU to receive a dynamic grant to transmit a second UL data packet. The UE is configured to receive a second UL scheduling grant from the target gNB-DU in response to the transmitted scheduling request. The UE is configured to determine that the indication of the successful LTM cell handover without RACH to the target gNB-DU is successfully communicated in response to the received second UL scheduling grant.

Various aspects of the present disclosure relate to a method for determining new random access channel (RACH) occasions (ROs) for use during random access procedures. For example, a network node (e.g., a base station) may configure a user equipment (UE) to derive a physical RACH (PRACH) configuration by combining a subframe or slot number one or more PRACH configuration indexes and transmit a preamble during random access via an RO that is based on the PRACH configuration (e.g., a "new" or derived PRACH configuration).

Methods, systems, apparatuses, and computer programs for multiple Physical Random Access Channel (PRACH) transmissions are disclosed. In one aspect, operations are performed by a UE and can include identifying the number of RACH occasions (ROs) M associated with a particular Synchronization Signal Block (SSB) in a single SSB-to-RO association pattern period P; obtaining a particular PRACH repetition number N, wherein the particular PRACH repetition number N is equal to or less than a maximum PRACH repetition number L; and determining the number of SSB-to-RO association pattern periods K within a time period X as a function of the number of ROs M associated with the particular SSB in a single SSB-to-RO association pattern period P and the particular PRACH repetition number N.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, in a half-duplex slot and in accordance with a random access channel (RACH) transmission repetition scheme, a first quantity of RACH transmissions. The UE may transmit, in accordance with the RACH transmission repetition scheme and in a full-duplex slot associated with a subband full-duplex (SBFD) configuration, a second quantity of RACH transmissions, the first quantity and the second quantity being based on a half-duplex slot type and a full-duplex slot type, respectively. Numerous other aspects are described.

Systems and methods for random access channel (RACH) procedure-based beam management using user equipment (UE)-sided artificial intelligence (AI) / machine learning (ML) models are discussed herein. In some embodiments, a UE receives a mapping of a set of RACH occasions (ROs) to a set of network narrow beams. The UE then applies its measurements of synchronization signal blocks (SSBs) transmitted by the network to an AI / ML model to identify a predicted network narrow beam. The RO corresponding to the predicted network narrow beam is used for a RACH transmission such that the predicted network narrow beam is identified to the network. In alternative cases, the network identifies that the UE is capable of using the AI / ML model based on a RACH transmission and uses a random access response message to instruct the UE to indicate the predicted network narrow beam in a contention resolution message.

Various solutions for improving handover processing in mobile communications with respect to an apparatus and a network node are described. An apparatus may determine a first part and a second part of handover processing. The second part of the handover processing causes an interruption with a source network node. The apparatus may determine a random access channel occasion (RO) of a target network node. The apparatus may perform the second part of the handover processing after the first part of the handover processing and right before the RO.

The application provides a method and device for determining the uplink transmission timing value of a random access channel. The method comprises the following steps: measuring the actual Doppler value and the actual timing value of the SSB signal at the current time; based on the periodic relationship between the SSB signal and the SIB1BIS signal, decoding the SIB1BIS signal according to the actual timing value and the actual Doppler value to obtain satellite trajectory information; obtaining the user terminal coordinates and ephemeris information, and determining the theoretical Doppler value and the theoretical timing value of the SSB signal according to the user terminal coordinates and the satellite trajectory information; calculating the propagation delay of the SSB signal at the current time according to the ephemeris information, the theoretical Doppler value, the theoretical timing value and the actual Doppler value; and determining the uplink transmission timing value of the random access channel at the transmission time according to the propagation delay, the theoretical timing value and the ephemeris information. The application solves the problem that the calculated value of the propagation delay between the low-orbit satellite and the user terminal in the prior art deviates from the actual value, resulting in a large timing deviation of the random access channel.

A user equipment and a method performed by the user equipment are disclosed. The method includes the following steps: receiving system information for configuring a first K offset as a scheduling offset for correcting the timing of uplink signals for NTN; receiving a control signal for configuring or updating a second K offset based on the first K offset; and transmitting uplink signals based on the first K offset or the second K offset, wherein the uplink signals are transmitted based on the first K offset in association with a random access channel (RACH).