Method and apparatus for optimal hand-offs in a satellite cellul

Details Method and apparatus for optimal hand-offs in a satellite cellul Method and apparatus for optimal hand-offs in a satellite cellul

1995-07-24

1998-05-12

Chin, Wellington

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

370316, 370331, 455427, 455436, 455443, H04Q 700, H04H 108

Patent

active

057521875

ABSTRACT:
A subscriber unit (26) communicates with a satellite communication system (10) that projects cells. The satellites (12) and cells move relative to the earth. During every other TDMA frame, a subscriber unit (26) measures the signal strength of all candidate hand-off beams. The signal strength of the current beam is compared to the signal strength of the candidate hand-off beams. When the signal strength of the current beam is not the strongest, a counter is incremented (108). A hand-off is requested to the beam with the greatest signal level when the counter exceeds a predetermined threshold. Accordingly, only after the current antenna beam has not been the strongest beam for a certain period of time, is a hand-off requested. A different counter threshold is used for candidate hand-off beams from other satellites (12).

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patent: 5561838 (1996-10-01), Chandos et al.
patent: 5574968 (1996-11-01), Olds et al.
Huber, J.F. "Satellite Mobile Communication," Telcom Report International 17(1994) No. 6--http://www.jou.ufl.edu/siemens/articles/0694/694huber.htm, Jun. 1994.
Otto, D. "Iridium-A Vision Becomes Reality," Telcom Report International 18 (1995) No. 3--http://www.jou.ufl.edu/siemens/articles/0395/395otto.htm, Mar. 1995.

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