发明名称 |
Soft handoff method and apparatus for mobile vehicles using directional antennas |
摘要 |
A system and method for implementing soft handoffs in a cellular 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.
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申请公布号 |
US2006229104(A1) |
申请公布日期 |
2006.10.12 |
申请号 |
US20050314647 |
申请日期 |
2005.12.21 |
申请人 |
THE BOEING COMPANY |
发明人 |
DE LA CHAPELLE MICHAEL;MONK ANTHONY D. |
分类号 |
H04B1/00;H04B15/00;H04M1/00;H04W84/06 |
主分类号 |
H04B1/00 |
代理机构 |
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代理人 |
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主权项 |
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