Insensible CR Scheme for Contention-based Wireless Network
Date Issued
2006
Date
2006
Author(s)
Hung, Shang-Ching
DOI
en-US
Abstract
With the fast development of wireless technology, a lot of user demands rely on wireless communication. Therefore, many wireless network standards are developed for certain purpose and that causes the radio frequency spectrums of the standards to have the overlap part. On the other hand, because of the usage of many requests from instable multimedia traffic and some user behavior of bursted traffic, the utilization of the channel might be low in most of the time. Therefore, the limited radio frequency spectra are treasurable. Issues about increasing or balancing spectrum utilization become more important. Moreover, issues about using spectrum holes have also been focused. CR (Cognitive Radio) technology is now developing for solving this critical problem. CR device is able to use a large range of frequency spectrum. The goal of CR is raise the channel utilization without influencing the original users. CR technology includes many aspects of researches, such as reusing spectrum holes invisibly, learning form users’ behavior, adjusting changes form the environment automatically. This thesis gives out a cognitive borrowing algorithm which can ensure the QoS of primary users. By using this algorithm with environment scanning capability, CR traffics increase the utilization of the channel with only rare damage to prior users. Moreover, the algorithm has the advantages of decentralized system, flexibility, low computing complexity, and fairness.
Subjects
感知無線電
cognitive radio
Type
thesis
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