A technique of performing a handover procedure involves providing a proper timing adjustment indication for the UE performing RACH-less HO. Even though the discussion herein is on IAB scenarios and the idea takes an advantage of IAB nodes being in fixed locations (i.e., not moving in the network), it can be applied to UEs in general. The timing adjustment provided in performing a HO in an IAB network according to the improved techniques involves computing a timing advance (TA) to be used by an IAB node prior to executing HO to an alternative serving node. Such a use of a TA may enable a bypassing of a RACH procedure when accessing a cell.

There is provided an apparatus, said apparatus comprising means for receiving a handover command from a first cell, the handover command comprising an uplink resource grant and a condition to be met before handover is performed to a second cell, wherein the uplink resource grant indicates a set of uplink resources for uplink data transmission in the second cell without random access, determining validity of the uplink resource grant based on one or more further configuration parameter and in response to the condition being met, performing the handover according to the validity of the uplink resource grant.

The present disclosure relates to a communication technique for converging a 5G communication system, which is provided to support a higher data transmission rate beyond a 4G system with an IoT technology, and a system therefor. The present disclosure may be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety related service, or the like) based on the 5G communication technology and the IoT related technology. The present disclosure discloses a method and an apparatus for supporting a multiple access in next generation mobile communication systems.

A communication apparatus includes an acquisition unit to acquire, from a base station apparatus being connected, switching information including information used for wireless communication with a movably configured base station apparatus to be a switching destination candidate, a determination unit configured to determine whether or not to switch a base station apparatus to be a connection destination, and a connection unit configured to, upon determining by the determination unit to switch the base station apparatus to be the connection destination, execute connection to the base station apparatus to be the switching destination candidate on a basis of the switching information.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, from a base station, a high layer signaling including information enabling a multiplexing of a first hybrid automatic repeat request-acknowledgement (HARQ-ACK) information, receiving, from the base station, first downlink control information (DCI) scheduling physical uplink shared channel (PUSCH) repetitions, receiving, from the base station after the first DCI, second DCI indicating a physical uplink control channel (PUCCH), and transmitting, to the base station, the first HARQ-ACK information by multiplexing the first HARQ-ACK information in at least one PUSCH repetition other than a first PUSCH repetition among the PUSCH repetitions.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, in accordance with a handover from a source cell to a target cell, an indication of an initial power adjustment state to be used for an initial transmission to the target cell. The UE may perform an initial transmission to the target cell in accordance with the initial power adjustment state. Numerous other aspects are described.

Methods and apparatuses for a MAC CE for multi-TRP operation in a wireless communication system. A method of a UE comprises: receiving, from a base station, a RACH-less switching command for a RACH-less switching operation to a target cell; determining whether a DRX is configured for the target cell; and retaining an active time during the RACH-less switching operation based on a determination that the DRX is configured for the target cell, monitoring a PDCCH to acquire a UL grant of an initial UL transmission, wherein the initial UL transmission for the RACH-less switching operation includes a transmission of a RRCReconfigurationComplete message to a target satellite or the target cell.

A RACH-less HO method for a UE in a NTN system is provided, including: receiving a HO command from a source cell, wherein the HO command includes a RACH-less HO configuration and a RACH-based HO configuration associated with one of cells of the NTN system, wherein the RACH-less HO configuration includes a RACH-less available time and a UL transmission resource; determining a target cell according to the at least one cell configured by the HO command; performing a UL resource selection procedure to obtain a target UL transmission resource associated with the target cell for performing a target UL transmission to the target cell; performing a HO confirmation procedure with the target cell by applying a UL timing adjustment information associated with the target UL transmission resource to perform the target UL transmission to the target cell.

Provided are method, system, and device for configuring inter-cell changes. The method may be implemented by receiving, by a user equipment (UE), a downlink signal, wherein the downlink signal originates from a serving distributed unit (DU), and wherein the downlink signal comprises at least one of a scheduling gap duration value, a start time value, and a target cell index; performing, by the UE during the scheduling gap duration, an uplink sync with a target cell, based on the downlink signal; and wherein the uplink sync includes sending, by the UE, a preamble transmission to a target cell to acquire a timing advance of the target cell, based on the downlink signal, wherein the target DU is one of a plurality of neighboring cells to the serving DU.

A method for receiving a radio resource control (RRC) message by a user equipment (UE) is described. The method includes receiving an RRC connection reconfiguration (RRCConnectionReconfiguration) message including secondary cell group (SCG) configuration parameters. The RRC connection reconfiguration message has a structure that the SCG configuration parameters do not include a data radio bearer (DRB) configuration.