ISL Reassignment Based Snapshot Routing Optimization for Polar-Orbit LEO Satellite Networks

Zhu TANG  Zhenqian FENG  Wei HAN  Wanrong YU  Baokang ZHAO  Chunqing WU  Yuanan LIU  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.9   pp.1896-1905
Publication Date: 2015/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.1896
Type of Manuscript: PAPER
Category: Satellite Communications
ISL reassignment,  satellite networks,  snapshot routing,  

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This paper presents an inter-satellite link (ISL) reassignment method to optimize the snapshot routing performance for polar-orbit LEO satellite networks. When the snapshot routing tables are switching simultaneously in all satellites, we propose to reassign the inter-plane ISLs with regularity to improve the quality of the next snapshot, such as snapshot duration, on-board transceiver utilization ratio and end to end delay. Evaluations indicate that our method can attain equal-length snapshots regardless of the latitude of the polar area border, and so is superior to the natural partition method. Meanwhile, compared with the equal partition method which is used in the Iridium system, our method can prolong 82.87% snapshot duration, increase 8.68% on-board transceiver utilization ratio and reduce 5.30% average end to end delay of the whole network. Therefore, we believe that the ISL reassignment method can be efficiently applied in all practical polar-orbit LEO satellite networks.