Future Channel Utilization-Aware Routing for Cognitive Radio Ad Hoc Networks

Celimuge WU  Juan XU  Yusheng JI  Satoshi OHZAHATA  Toshihiko KATO  

IEICE TRANSACTIONS on Communications   Vol.E98-B    No.1    pp.107-115
Publication Date: 2015/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.107
Type of Manuscript: Special Section PAPER (Special Section on Quality of Diversifying Communication Networks and Services)
cognitive radio ad hoc networks,  routing protocol,  future channel utilization,  

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Cognitive radio ad hoc networks can be used to solve the problems of limited available spectrum and inefficient spectrum usage by adaptively changing their transmission parameters. Routing protocol design has a significant impact on the network performance. However, an efficient protocol that takes account of primary user flows and the long-term channel assignment issue in route selection is still missing. In this paper, we propose AODV-cog, a cognitive routing protocol for CSMA/CA ad hoc networks based on AODV. AODV-cog chooses a route by considering the effect on the primary users, available channel bandwidth and link reliability. AODV-cog also takes account of future channel utilization which is an important but underexplored issue. AODV-cog switches channels for secondary user flows when network congestion occurs. We use theoretical analysis and computer simulations to show the advantage of AODV-cog over existing alternatives.