Virtual topology dynamics and handover mechanisms in Earth-fixed LEO satellite systems

Authors:
Ömer Korçak;Fatih Alagöz
Affiliations:
Department of Computer Engineering, Computer Networks Research Laboratory (NETLAB), Boğaziçi University, Istanbul, Turkey;Department of Computer Engineering, Computer Networks Research Laboratory (NETLAB), Boğaziçi University, Istanbul, Turkey
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2009

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Abstract

Handling network mobility in a highly dynamic LEO satellite network is a critical issue to achieve seamless and efficient integration of satellite and terrestrial networks. In Earth-fixed satellite systems, this task could be simplified by representing the network with a more static virtual topology. Virtual node (VN) approach is widely explored in satellite networks research; however, it has some deficiencies due to necessity of one-to-one correspondence between virtual nodes and physical satellites. In this work, a generic virtual topology model, namely multi-state virtual network (MSVN) architecture that alleviates these deficiencies, is proposed. A new mathematical model for MSVN is introduced along with its potential contribution to the overall system availability. Furthermore, possible handover mechanisms in Earth-fixed satellite systems are investigated, and new efficient handover mechanisms for both VN-based systems and MSVN-based systems are proposed. Comparing the handover mechanisms, we conclude with the benefits of using an MSVN-based Earth-fixed satellite system.