Method and apparatus for satellite handoff parameters prediction

Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater

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455 132, 455 121, H04B 7185

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active

055618383

ABSTRACT:
A satellite cellular communications network performs cell-to-cell handoffs between cells of different satellites (30, 32). Inter-satellite handoffs require resynchronization to the prospective propagation timing and Doppler frequency parameters of the prospective satellite. Calculation of these parameters prior to transitioning to the prospective satellite minimizes interruptions to communications. Subscriber units (24) perform handoff parameter calculations while on narrow band communications channels without occupying broadband shared acquisition resources.

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Steve Moritz, Handoff Design Considerations for the IRIDIUM.TM. System, Special Issue on Mobile Sattelite Communications, Nov. 1991.
IRIDIUM Ground Segments, Special Issue on Mobile Satellite Communications, Nov. 1991.

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