The present application is at least directed to an apparatus in a network including a non-transitory memory including instructions stored thereon for obtaining a resource for accessing a target cell in the network. The apparatus includes a processor, operably coupled to the non-transitory memory, configured to execute the instructions of detecting plural beams associated with the target cell. The processor also executes the instructions of determining one or more of the plural detected beams meeting a threshold for performing random access. The processor also executes the instructions of evaluating if a physical random access channel (PRACH) resource is associated with the one or more determined beams meeting the threshold. The processor further executes the instructions of selecting one of the evaluated beams exhibiting a reference signal received power (RSRP) above a predetermined value. The processor even further executes the instructions of picking the PRACH resource associated with the selected beam.

Various embodiments include methods and user equipment (UE) for mobile-terminated call handling when a latency-sensitive service (LSS) is active on the UE. Embodiments may include determining a radio access technology (RAT) used for a latency-sensitive service (LSS) currently active on the UE in response to receiving an MT call invitation and determining whether a latency-prone service command is received that includes service commands configured to change the determined RAT used for the LSS to another RAT likely to compromise the LSS. In response to determining that a latency-prone service command is received the MT call invitation may be rejected, but in response to determining that a latency-prone service command is not received, MT call alerting may be allowed.

A method for a conditional handover (CHO) is described in some of the present embodiments. The method may receive from a source base station (e.g., a gNB or an eNB) one or more CHO commands that each is associated with one or more triggering conditions for a CHO to a target cell associated with a target base station (e.g., a target gNB or a target eNB). The method may continuously evaluate the triggering condition(s) associated with each received (and valid) CHO command. When the method determines that at least one of the triggering conditions has been fulfilled, the method may execute the CHO command that is associated with the triggering condition in order to connect to one or more candidate target cells associated with the CHO command.

A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives a first Radio Resource Control (RRC) message indicative of switching a Primary Cell (PCell) of the UE to a first cell, wherein the first RRC message is indicative of a first configuration of the first cell. The UE resets a Medium Access Control (MAC) entity associated with the PCell of the UE in response to receiving the first RRC message. The UE receives a second RRC message indicative of a second configuration of a second cell. The UE receives a signaling indicative of initiating a mobility procedure to switch the PCell of the UE to the second cell. The signaling includes a Physical Downlink Control Channel (PDCCH) signaling and/or a MAC Control Element (CE). The UE does not reset the MAC entity associated with the PCell of the UE in response to the mobility procedure.

A base station switching method for a source base station includes: receiving a measurement report sent by the unmanned aerial vehicle, wherein the measurement report comprises information used for indicating a target base station to which the unmanned aerial vehicle requests to switch; when determined to switch to the target base station according to the measurement report, sending a switch request carrying first information to the target base station, wherein the first information is used to indicate that a terminal requesting the switch is an unmanned aerial vehicle; when receiving a handover request acknowledge returned by the target base station, performing a switching operation from the source base station to the target base station. As such, the source base station achieves a base station switch for an unmanned aerial vehicle, ensures continuity of service for the unmanned aerial vehicle, and broadens the application range of the unmanned aerial vehicle.

Herein described are apparatuses, systems, and methods related to handover operations of user equipment within a wireless network. An apparatus for an evolved NodeB (eNB) may include circuitry to determine one or more candidate eNBs available to provide service to a user equipment (UE) based on cell information received from one or more other eNBs, and generate an autonomous handover (HO) information message for transmission to the UE, wherein the autonomous HO information message includes an indication of the one or more candidate eNBs. The apparatus may further include memory to store the indication of the one or more candidate eNBs. Other embodiments may be described and/or claimed.

A method for re-establishing a Radio Resource Control, RRC, connection between a User Equipment (1), UE, and a target evolved NodeB (3), target eNB, the method being performed by the UE (1) and comprising: receiving (S100) an RRC Connection Reestablishment message from the target eNB (3), the RRC Connection Reestablishment message including a downlink, DL, authentication token which has been generated by a Mobility Management Entity (4) and has had a Non Access Stratum integrity key as input; and authenticating (S110) the received DL authentication token. Discloses are also UEs, target eNBs, source eNBs and Mobility Management Entities as well as methods, computer programs and computer program product related thereto.

A method and apparatus for accessing a random access channel (RACH) during handover are disclosed. A handover procedure is initiated and a maximum handover interruption timer is activated. A dedicated preamble is transmitted in an attempt to access the RACH on a condition that the dedicated preamble is reserved in a current random access opportunity and the maximum handover interruption timer has not expired. A contention-based preamble is transmitted in an attempt to access the RACH on a condition that a dedicated preamble is not reserved in a current random access opportunity. If the maximum handover interruption timer has expired, a contention-based preamble is transmitted in an attempt to access the RACH.

A UE transmits a radio access capability to a base station. The radio access capability is transmitted via an information element that comprises a bitmap in which a bit has a value that indicates, to the base station, support of a modification to at least one of a maximum power reduction or a spectrum emission requirement. According to embodiments, the base station manages the UE based on the supported modification. Such managing of the UE may include, for example, one or more of admission control, imposing scheduling restrictions, and imposing handover restrictions.

The present disclosure relates to a source base station. The source base station comprises a processing circuitry that generates a user equipment packet duplication status. The user equipment packet duplication status includes information on the status of uplink packet duplication performed by a user equipment with the source base station and at least one further base station. The information on the status of uplink packet duplication is per uplink radio bearer, one or more uplink radio bearers being established between the user equipment and the source base station. The source base station further comprises a transmitter that transmits the user equipment packet duplication status to a target base station which is the target of a handover from the source base station performed for the user equipment.