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Related to hand-off: handover
handoff(1) See Apple Handoff.
(2) To transfer from one function or system to another. For example, self-driving cars require a handoff from automatic to the human driver when a situation arises that it cannot figure out on its own.
(3) Switching a cellular phone call from one radio channel to another. Also called "handover," it mostly occurs when a mobile user travels into the range of an adjacent cell. However, when there is excessive interference on a radio channel, switching can occur within the same cell.
The handoff can be managed within the base station; the base station controller (BSC) that manages several base stations; or the mobile switching center (MSC) that sets up and tears down the calls. The switch typically takes place in about a quarter second so that the caller is unaware of it.
An action taken to transfer the radar identification of one aircraft from one controller to the other if the aircraft will enter the receiving controller's airspace. At that point, the transfer of radio control will also take place. In military terminology, the term handing over or taking over is used.