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Summary: High Throughput Spectrum-aware Routing for
Cognitive Radio Networks
Ashwin Sampath, Lei Yang, Lili Cao, Haitao Zheng, Ben Y. Zhao
Computer Science Department, University of California at Santa Barbara
{ashwins, leiyang, lilicao, htzheng, ravenben}@cs.ucsb.edu
Abstract--Dynamic spectrum networks enable fast deployment
of new wireless technologies by effectively utilizing allocated yet
unused wireless spectrum. By sensing and utilizing available wire-
less channels, cognitive radio devices can provide high through-
put, low latency communication. Existing schemes for channel as-
signment suffer drawbacks in throughput and reachability in the
presence of location-dependent channel availability. We propose
SPEctrum-Aware Routing Protocol (SPEAR), a robust and efficient
distributed channel assignment and routing protocol for dynamic
spectrum networks based on two principles: integrated spectrum
and route discovery for robust multi-hop path formation, and
distributed path reservations to minimize inter- and intra-flow
interference. Through simulations and testbed measurements, we
show that SPEAR establishes robust paths in diverse spectrum
conditions and provides near-optimal throughput and end-to-end
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