08280309 is referenced by 26 patents and cites 62 patents.

A system and method for implementing soft handoffs in a communications system on a mobile platform. The system employs an antenna controller in communication with a beam forming network that generates two independently aimable lobes from a single beam. The single beam is radiated by a phased array antenna on the mobile platform. In an Air-to-Ground implementation involving an aircraft, a base transceiver station (BTS) look-up position table is utilized to provide the locations of a plurality of BTS sites within a given region that the aircraft is traversing. The antenna controller controls the beam forming network to generate dual lobes from the single beam that facilitate making a soft handoff from one BTS site to another. In a ground-based application, one lobe of the beam is used to maintain a communications link with one BTS site while a second lobe of the beam is continuously scanned about a predetermined arc to receive RF signals from other BTS sites and to determine when a new BTS site has become available that will provide a higher quality link than the link presently made with the one BTS site. A soft handoff is then implemented from the one BTS site to the new BTS site.

Title
Soft handoff method and apparatus for mobile vehicles using directional antennas
Application Number
11/314640
Publication Number
8280309 (B2)
Application Date
December 21, 2005
Publication Date
October 2, 2012
Inventor
Anthony D Monk
Seattle
WA, US
Agent
Harness Dickey & Pierce
Assignee
The Boeing Company
IL, US
IPC
H04B 15/00
H04B 1/00
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