The invention relates to a method in a cellular telecommunications network, the method including discovering a second donor base station having a first interface for communicating with the first central base station unit and a second interface for wirelessly communicating with the distributed base station unit; determining a capacity of a connection between the central base station unit and the distributed base station unit via the second donor base station; determining that the capacity of the connection satisfies a functional split threshold; and, in response to this determination, causing the centralized base station unit and the distributed base station unit to implement a second functional split in which a third set of protocol functions are implemented in the distributed base station unit and a fourth set of protocol functions are implemented in the central base station unit; and initiating a handover of the distributed base station unit from the first donor base station to the second donor base station.

A cell reselection control method according to an embodiment comprises transmitting, by a base station configured to manage a cell having a first coverage and a second coverage as a portion enhanced more than the first coverage, to a radio terminal under the cell, a reselection instruction that instructs to reselect a neighboring cell different from the cell, and reselecting, by the radio terminal, the neighboring cell according to the reselection instruction when the radio terminal is in the second coverage.

A cell reselection control method according to an embodiment comprises transmitting, by a base station configured to manage a cell having a first coverage and a second coverage as a portion enhanced more than the first coverage, to a radio terminal under the cell, a reselection instruction that instructs to reselect a neighboring cell different from the cell, and reselecting, by the radio terminal, the neighboring cell according to the reselection instruction when the radio terminal is in the second coverage.

A handover command message can be received. The handover command message can include at least one handover condition. The at least one handover condition can include an indication that handover can occur after at least one beam failure. A handover procedure can be performed based on the at least one handover condition.

A handover command message can be received. The handover command message can include at least one handover condition. The at least one handover condition can include an indication that handover can occur after at least one beam failure. A handover procedure can be performed based on the at least one handover condition.

A User Equipment (UE) including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a first cellular station and a second cellular station. The controller continues to send or receive UP data to or from the first cellular station via the wireless transceiver after receiving a handover command message for a handover of the UE from the first cellular station to the second cellular station, and receives a Radio Resource Control (RRC) request message from the second cellular station via the wireless transceiver after sending a handover complete message to the second cellular station. Also, the controller detaches from the first cellular station in response to receiving the RRC request message.

A User Equipment (UE) including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a first cellular station and a second cellular station. The controller continues to send or receive UP data to or from the first cellular station via the wireless transceiver after receiving a handover command message for a handover of the UE from the first cellular station to the second cellular station, and receives a Radio Resource Control (RRC) request message from the second cellular station via the wireless transceiver after sending a handover complete message to the second cellular station. Also, the controller detaches from the first cellular station in response to receiving the RRC request message.

A system described herein may provide a technique for the handover of a User Equipment (“UE”) from a first Distributed Unit (“DU”) of a wireless network to a second DU in a manner that minimizes or interruption of the delivery of traffic to the UE. When the UE is attached to a first DU, one or more second DUs may be identified as candidates for attachment to the UE. The one or more second DUs may be pre-loaded with context information and/or traffic for the UE. In some embodiments, a third mesh DU (“MDU”) may be identified as a candidate for attachment to a first MDU that is attached to a second MDU. The third MDU may be pre-loaded with context information and/or traffic for the first MDU.

A system described herein may provide a technique for the handover of a User Equipment (“UE”) from a first Distributed Unit (“DU”) of a wireless network to a second DU in a manner that minimizes or interruption of the delivery of traffic to the UE. When the UE is attached to a first DU, one or more second DUs may be identified as candidates for attachment to the UE. The one or more second DUs may be pre-loaded with context information and/or traffic for the UE. In some embodiments, a third mesh DU (“MDU”) may be identified as a candidate for attachment to a first MDU that is attached to a second MDU. The third MDU may be pre-loaded with context information and/or traffic for the first MDU.

The disclosed method for a communication satellite may include (1) simultaneously generating a first transmission beam to a first ground station and a second transmission beam to each of a plurality of second ground stations in sequence according to a schedule, (2) simultaneously receiving a third transmission beam from the first ground station and a fourth transmission beam from each of the second ground stations in sequence according to the schedule, (3) forwarding first data received via the third transmission beam to each of the second ground stations via the second transmission beam, and (4) forwarding second data received via the fourth transmission beam from each of the second ground stations to the first ground station via the first transmission beam. Various other methods and systems are also disclosed.