Optimization of Handover Plans to Minimize the Degradation of Communications QoS for LEO Satellite Systems

Yasushi WAKAHARA  Kazumasa SATO  Jun-ichi MIZUSAWA  

IEICE TRANSACTIONS on Communications   Vol.E86-B   No.10   pp.2891-2901
Publication Date: 2003/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (IEICE/IEEE Joint Special Issue on Assurance Systems and Networks)
Category: Network Control and Management
QoS,  LEO,  satellite,  handover,  optimization,  

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Handovers are occasionally required for LEO (Low Earth Orbit) satellite systems, since the satellites are always moving. Handovers, however, generally cause some degradation of communication quality. Some LEO systems have a feature of two types of satellites in terms of the direction of their orbits and the handover between satellites of different types may lead to a large change in the path between the service satellites used for the communication. Thus, the degradation can be generally large especially in the case of handovers between different type satellites. As such, best handover plan should be derived so that the number of handovers should be made smallest to minimize the degradation of the communication quality. In this paper, such optimization problems are formulated in relation to the handovers and their solutions are proposed to actualize the optimization of handover plans for LEO satellite systems with two types of satellites.