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 method of processing state information relating to user equipment in a communications system comprising a radio access network, the method comprising: maintaining current state information relating to the user equipment; and on the basis of a change of connection of the user equipment from a first cell to a second cell: transmitting a current value associated with a given state information part to the target radio access node in response to detecting at least one of one or more predetermined triggers that indicate that the target radio access node may not have received the current value from the source radio access node; or relying on the target radio access node having received the current value from the source radio access node if said at least one of said one or more predetermined triggers is not detected.

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 method is performed in a first infrastructure equipment for a handover of a wireless device from the first infrastructure equipment as a source to a second infrastructure equipment as a target. The method comprises maintaining a mapping between a plurality of packet bearers and a data radio bearer for the wireless device, each of the plurality of packet bearers being configured to provide a specified quality of service, determining that the wireless device should handover from the first infrastructure equipment to the second infrastructure equipment, determining that the second infrastructure equipment does not support the mapping of the plurality of packet bearers to the data radio bearer, and providing an indication of a mapping of the plurality of packet bearers for the second infrastructure equipment after handover to one of a core network equipment and the second infrastructure equipment.

In a mobile communication system, an RRM measurement set is set as a collection of cells to become targets on which a UE performs a process of detecting whether or not radio communication is allowed. Among the cells in the RRM measurement set, a CoMP measurement set is set as a collection of cells to become candidates on which the UE performs a process of detecting whether or not coordinated communication (CoMP communication) is allowed. Among the cells of the CoMP measurement set, a CoMP active set is set as a collection of cells to become targets on which the UE performs the process of detecting whether or not CoMP communication is allowed.

Certain aspects of the present disclosure provide techniques for prioritizing overlapping or near overlapping uplink transmissions for a source base station (BS) and a target BS during a make-before-break handover of a user equipment (UE) from the source BS to the target BS.

Embodiments of the present disclosure provide a policy control method and system, a network element, and a storage medium. A control plane network element establishes, for UE, a first DN connection that uses a first forwarding plane network element as an anchor. The method includes: when the control plane network element receives a handover notification message for the UE and determines that a second forwarding plane network element serves the UE, or when the control plane network element establishes, for the UE, a second DN connection that uses a second forwarding plane network element as an anchor, the control plane network element updates a forwarding path of the first DN connection, so that an updated forwarding path of the first DN connection passes through the second forwarding plane network element, and the second forwarding plane network element performs policy control on a packet on the first DN connection.

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.

This disclosure provides systems, methods and apparatuses for a user equipment (UE) performing Listen Before Talk (LBT) procedures during a handover, such as during a dual active protocol stack (DAPS) handover or a conditional handover. During the handover, the UE may have a source connection with a source cell. If the source cell is unlicensed, the UE may perform LBT for a channel of the source cell. The UE may establish a target connection with a target cell before releasing the source connection with the source cell. If the target cell is unlicensed, the UE may perform LBT for a channel of the target cell.

Methods, apparatuses, and systems for wireless communications are described. A base station may send a message with configuration parameters to a wireless device, and the configuration parameters may be for at least two different types of carriers used for communications.