Strategies for fast scanning, ranging and handovers in WiMAX/802.16

Authors:
Paul Boone;Michel Barbeau;Evangelos Kranakis
Affiliations:
School of Computer Science, Carleton University, 1125 Colonel By Drive, Ottawa, K1S 5B6, Canada.;School of Computer Science, Carleton University, 1125 Colonel By Drive, Ottawa, K1S 5B6, Canada.;School of Computer Science, Carleton University, 1125 Colonel By Drive, Ottawa, K1S 5B6, Canada
Venue:
International Journal of Communication Networks and Distributed Systems
Year:
2008

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Abstract

In WiMAX/IEEE 802.16 with mobility support, the network entryprocedure for a mobile station involves several steps including thescanning for an available channel and performing initial ranging inorder to determine power and timing offset requirements. Thesesteps are performed by a mobile station at start up or when aboutto perform a handover and must be done promptly in order to reducedelays in network access or possible dropped connections. Wepropose strategies that a mobile station can use to reduce the timerequired for scanning and ranging operations while attempting toestablish network connectivity or perform a handover betweenneighbouring base stations. We model and simulate an area of WiMAXcoverage using real-world mobility trace data and show that thereare strategies that reduce the time required for scanning andranging operations significantly.