A Novel Vertical Handover Control Algorithm for WLAN and UMTS

• Main Authors: Chie Ming Chou, 周建銘
• Other Authors: Ching Yao Huang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/17059424744664385456

碩士 === 國立交通大學 === 電子工程系所 === 93 === How to design an effective and smooth vertical handover algorithm is a trend for the integrated system to achieve the high-speed transmission, high mobility, and satisfied QoS. In this thesis, a novel vertical handover control algorithm, consisting of a throughput-based mapping function, QoS-based dynamic handover thresholds, and performance-based trigger timers, are proposed to resolve 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. The analytic results show that the proposed algorithm could improve the transmission throughput for non-real-time services and can substantially reduce the packet loss rate for the real-time services by reducing the vertical handover frequency.