NOVEL VERTICAL HANDOVER CONTROL ALGORITHM FOR WLAN AND UMTS

摘要

PPROBLEM TO BE SOLVED: To provide an integrated WLAN and UMTS system comprising a throughput-based mapping function, QoS-based dynamic handover thresholds, and performance-based trigger timers. PSOLUTION: A novel vertical handover control algorithm, consisting of a throughput-based mapping function, QoS-based dynamic handover thresholds and performance-based trigger timers, is proposed to solve uncommon pilot problems, QoS requirements, and ping-pong effects, respectively. An analytic model based on a finite state machine is developed to evaluate the proposed algorithm in terms of the handover frequency and achievable throughput. A numerical analysis is also provided to further quantify the performance impacts. PCOPYRIGHT: (C)2007,JPO&INPIT