Proposal and evaluation of communication schemes for mobile systems employing stratospheric aircraft

In this paper, we employed a stratospheric aircraft system in mobile commun ications and conducted field tests on the visibility and shadowing states b ased on measurements to construct a simulation of a varying communications environment. Based on these measurement data, we present the basic transmis sion characteristics in a mobile communication environment using stratosphe ric aircraft, and propose and evaluate the performances of the Time Divisio n data transmission Among Aircraft (TDAA) scheme, which has the objective o f lessening data losses due to shadowing as a specific communication scheme , and the Directional Access using Shadowing (DAS) scheme that is used in a shadowing environment in the uplink line. We also evaluate the performance s of the Aircraft Position Control (APC) scheme and the Pilot Signal Contro l (PSC) scheme, which are flow control schemes having the objective of load distribution in high-load regions. (C) 2001 Scripta Technica.