handover
    n 1: act of relinquishing property or authority etc; "the
         handover of occupied territory"

handover \handover\ n.
   The act of relinquishing property or authority etc. to
   another; as, the handover of occupied territory to the
   original posssessors; the handover of power from the military
   back to the civilian authorities.
   [WordNet 1.5]

handover
handoff
HO

    (HO, or "handoff") the mechanism by which an
   on-going cellular connection between a mobile terminal (MT,
   typically a mobile phone) or mobile host (MH) and a
   corresponding terminal or host is transferred from one point
   of access of the fixed network to another.

   Handover may occur because the phone is leaving its current
   cell, to balance demand between cells, to reduce interference
   or to transfer a user who has stopped moving to a nearby cell
   with shorter range.

   (2010-05-07)