Evaluation of priority dependent and time scheduled MAC layer protocols for ad-hoc networks

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2015

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Erdeğer, İsmail

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Ad-hoc networks have very unique features, such as dynamic topologies, relatively limited bandwidth and wireless signal propagation schemes, which present various challenges for wireless communication. In this thesis, control mechanisms for channel access scheduling and topology in ad-hoc networks are evaluated, which utilize the information from two-hop neighborhood to cope with the communication difficulties in ad-hoc networks. Channel assignment is one of the most important topics for ad-hoc networks. Channel assignment problem can be studied using various technologies, such as time division, frequency division and code division multiple access. TDMA usage in adhoc networks appeals significant scientific curiosity recently. TDMA based MAC layer protocols are constructed to take hidden terminal, direct interference and self-interference problems into consideration as well. Ad-hoc networks suffer from these challenging problems. In this thesis a solution -priority dependent and time scheduled media access control (MAC) layer protocol for adhoc networks is evaluated to solve these problems. The priority dependent and time scheduled MAC layer protocol for ad-hoc networks is composed of three protocols which are node activation, link activation and pair wise link activation. In these algorithms contentions are resolved before channel access by means of the priority numbers and spread codes assigned to nodes/links randomly. Details about application of these three MAC layer protocols are presented as parts of the solution. After achieving the simulation results, these MAC vi layer algorithms are compared in terms of their throughput and delay performance in two different node situations; static and mobile.

Subject Keywords

Ad hoc networks (Computer networks)., Time division multiple access., Data transmission systems., Wireless communication systems.

URI

http://etd.lib.metu.edu.tr/upload/12619579/index.pdf
https://hdl.handle.net/11511/25310

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

İ. Erdeğer, “Evaluation of priority dependent and time scheduled MAC layer protocols for ad-hoc networks,” M.S. - Master of Science, Middle East Technical University, 2015.