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Interference and Capacity Analysis in Wireless Mesh Network

Thesis Info

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Author

Zeeshan, Muhammad

Program

PhD

Institute

National University of Sciences & Technology

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2016

Thesis Completion Status

Completed

Subject

Computer Science

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/7334/1/Muhammad_Zeeshan_Information_Technology_2016_HSR_NUST_10.11.2016.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727779601

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CSMA based MAC protocols are known to incur throughput imbalance when employed in multi hop wireless networks and existing literature lacks efficient MAC protocol for wireless mesh networks. Accurate modeling of interference and its affect on throughput of flows in the WMN is critical in designing future wireless networking protocols. This thesis performs a thorough analysis of interference and capacity in wireless multi hop network based on CSMA/CA MAC behavior. It is hypothesized that accurate modeling of interference at MAC level can maximize overall network capacity. In first part of thesis, twenty five unique possible two flow topologies have been classified into six categories based on MAC layer behavior and per flow throughput and closed form expressions for occurrence probabilities of the identified categories have been derived with particular observation that carrier sensing range based categories have high occurrence probability and cannot be ignored. MAC behavior of each category is discussed. In the second iii iv part, accurate computation of conditional packet loss probability and busy time is done based on geometrical configuration of the interfering links and also predicted per-flow throughput while addressing CSMA’s coordination problem. Unlike previous work, our analytical throughput model can clearly differentiate between links interfering from transmission range and carrier sensing range. Analytical and empirical results demonstrate improved accuracy, indicate throughput imbalances and provide better understanding of CSMA based protocol behavior in multi-hop wireless networks that can be used to design fair, scalable, and efficient MAC layer protocols.
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منظوم خراجِ تحسین

منظوم خراج تحسین
ڈاکٹر شہزاد احمد ہیں فدائے مصطفی
از ازل تا بہ ابد ہیں یہ گدائے مصطفی

نعت کے شعبے میں ان کی اس قدر خدمات ہیں
عاشق سرکار ہیں! گویا نوائے نعت ہیں

ایک دن ہم نے سنی ان سے یہ پیاری سی نوید
ان سے وابستہ ہوئے ہیں حضرت شفقت فرید

دھیمی دھیمی سی مسلسل ان کی جو پرواز ہے
ان کے کاموں پر بھی اب کچھ کام کا آغاز ہے

’’ایم فل‘‘ ان پر ہوا ہے منفرداور کامیاب
کام یہ شفقت میاں نے کر دیا ہے لاجواب

ڈاکٹر شہزاد احمد کو مبارک ہو یہ کام
حضرت شفقت کو ہو اس کام پر میرا سلام

اوج پائے یہ مقالہ آپ کا شفقت فرید
ہے لب خاکی پہ اتنی سی دعا شفقت فرید
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Indexing plays a vital role in Information Retrieval. With the availability of huge volume of information, it has become necessary to index the information in such a way to make easier for the end users tond the information they want e - ciently and accurately. Keyword-based indexing uses words as indexing terms. It is not capable of capturing the implicit relation among terms or the semantics of the words in the document. To eliminate this limitation, ontology-based indexing came into existence, which allows semantic based indexing to solve complex and indirect user queries. Ontologies are used for document indexing which allows semantic based information retrieval. Existing ontologies or the ones constructed from scratch are used presently for indexing. Constructing ontologies from scratch is a labor-intensive task and requires extensive domain knowledge whereas use of an existing ontology may leave some important concepts in documents un-annotated. Using multiple ontologies can overcome the problem of missing out concepts to a great extent, but it is di cult to manage (changes in ontologies over time by their developers) multiple ontologies and ontology heterogeneity also arises due to ontologies constructed by di erent ontology developers. One possible solution to managing multiple ontologies and build from scratch is to use modular ontologies for indexing. Modular ontologies are built in modular manner by combining modules from multiple relevant ontologies. Ontology heterogeneity also arises during modular ontology construction because multiple ontologies are being dealt with, during this process. Ontologies need to be aligned before using them for modular ontology construction. The existing approaches for ontology alignment compare all the concepts of each ontology to be aligned, hence not optimized in terms of time and search space utilization. A new indexing technique is proposed based on modular ontology. An e cient ontology alignment technique is proposed to solve the heterogeneity problem during the construction of modular ontology. Results are satisfactory as Precision and Recall are improved by (8%) and (10%) respectively. The value of Pearsons Correlation Coe cient for degree of similarity, time, search space requirement, precision and recall are close to 1 which shows that the results are signi cant. Further research can be carried out for using modular ontology based indexing technique for Multimedia Information Retrieval and Bio-Medical information retrieval.