Patent ID: 8914027

Claim:
A method of initiating handover pre-preparation for a mobile device in a wireless communication system, the method comprising the steps of: receiving a first pre-prepared handover command from a source base station, wherein the first pre-prepared handover command includes first context of a first target base station, whereby the mobile device does not perform a handover procedure when receiving the first pre-prepared handover command; starting a timer upon receiving the first pre-prepared handover command from the source base station and keeping the first context until the timer expires or the handover procedure is performed; receiving out-of-service information from the source base station, wherein the out-of-service information indicates out-of-service duration and an out-of-service cause; and determining whether to stay connected to a cell served by the source base station or to handover to the first target base station by using the first context, according to the out-of-service information.