| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 99 === In modern society, the growing popularity of wireless communications causes the insufficient of wireless frequency bands. Cognitive radio (CR) technology becomes one of the key enabling technologies that can address the spectrum scarcity problem which enables sharing the licensed spectrum without interfere the transmission of licensed users.
In this paper, we proposed a light-weight cross layer transmission scheme for CR Ad Hoc Networks (CRAHNs). The cross layer model includes a rendezvous guaranteed Channel Hopping (CH) sequence generating procedure and a tree-based transmission model which ensures the rendezvous demand over SUs and supports a pair-wise time slot and channel assignment to reach fairly transmission demand. To establish a reliable link in cognitive radio networks (CRNs), our channel hopping scheme performs data transmission without common control channel requirement, and provide smaller time-to-rendezvous (TTR) than previous works. The worth mentioning is the tree-based transmission model can conditionally achieves 100% spectrum utilization rate without any collision.
The simulation results show that our scheme can reduce performance impact of incumbent occupation by licensed users and guarantee the rendezvous over SUs. Moreover, our scheme provides further throughput improvement in a high density network environment compared to existed works.
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