Spectrum Aware Opportunistic Routing in Cognitive Radio Networks
Date Issued
2010
Date
2010
Author(s)
Lin, Shih-Chun
Abstract
Cognitive radio (CR) emerges as a key technology to enhance spectrum efficiency and thus creates opportunistic transmissions over communication links. Supporting the routing function on top of numerous opportunistic links is a must to route packets in a general cognitive radio network (CRN) consisting of multi-radio systems. However, there lacks complete understanding of these highly dynamic available links and a reliable end-to-end transportation mechanism over CRN. Aspiring to meet this need, in this thesis, we propose novel spectrum aware opportunistic routing (SAOR) algorithm suited for the CRN under wireless fading channels. With innovative establishment of the spectrum map from local sensing information and the derivation of the routing metric for opportunistic links known as opportunistic link transmission (OLT), the opportunistic path metrics, and the CR node metrics, the promising SAOR employs a cooperative scheme to enable multi-path transmissions and maintains the dual-scale QoS guaranteed throughput (i.e. opportunistic QoS guaranteed throughput and statistical QoS guaranteed throughput) for practical applications. Results in performance evaluation confirm that SAOR enjoys less delay with guaranteed throughput, not only in CRN, but also in general wireless network.
Subjects
Spectrum Aware
Dynamic Spectrum Access
Cognitive Radio Network
Cooperative Relay
Opportunistic Routing
Opportunistic QoS Guarantee
Statistical QoS Guarantee
Type
thesis
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