An Adaptive Thresholds Capacity Reservation Scheme for High Altitude Platform CDMA Systems

The 57th IEEE Semiannual Vehicular Technology Conference (VTC2003-Spring), 22-25th April 2003, Jeju, Korea.
Published Date:2003-04-22
In High Altitude Platform Station (HAPS) systems, one of the major challenges is to maintain the station-keeping in the face of stratospheric turbulences. Unstable antenna beam pointing will cause frequent handoffs in HAPS based cellular networks, which drastically increases the forced termination probability of handoff calls. In this paper, we propose an adaptive thresholds capacity reservation (ATCR) scheme for soft handoff in an un-stable HAPS scenario. Through a prediction mechanism, a handoff call can dynamically adjust its handoff threshold ac-cording to potential traffic load in current cells. Based on a platform motion model, simulations show that the ATCR scheme reduces the blocking and the forced termination probabilities without degrading the quality of service.
platform motion, adaptive threshold, handoff, HAPS

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