تحليل ظرفيت بازدهي در شبكه هاي مش بي سيم بزرگ، بررسي اثر عدم برابري تعداد كانال هاي ارتباطي و رابط هاي بي سيم

چكيده انگليسي :

Throughput Capacity Analysis of Large Wireless Mesh etworks the Impact of umber of Channels and Interfaces Mohammad Mansoori m mansoori@ec iut ac ir Date of submission 2009 05 24 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Mehdi Mahdavi m mahdavi@cc iut ac irAbstract The growing demand for the multimedia services including high speed Internet access voice andvideo over IP and in general broadband services has emerged next generation networks in whichcommunications services are extend to the community In this way a variety of wireless networks haveengaged however a key technology wireless mesh networks WMNs has been proposed recently to bettersupport multimedia services in growing IP based networks An infrastructure wireless mesh network InfWMN is a hierarchical network consists of mesh clients mesh routers and gateways The mesh routersform a wireless mesh infrastructure to which the mesh clients are connected using star topology To furtherimprove the flexibility of mesh networking a mesh router is usually equipped with multiple wirelessinterfaces Research into the analytical solutions for the capacity of the InfWMNs is highly topical Theprevious analytical solutions have only exposed the asymptotic per client throughput capacity of eithersingle channel InfWMNs or multi channel InfWMNs provided that each infrastructure node i e wirelessmesh routers and gateways has a dedicated interface per channel From the previous analytical results thereare lacks of studies that address the more practical cases where the number of interfaces per node is less thanthe number of channels In this thesis we derive an original analysis of the asymptotic per client throughputcapacity of multi channel InfWMNs in which the number of interfaces per infrastructure nodes denoted bym is less than or equal to the number of channels c To the best of our knowledge up to the time of thisstudy there is no research on the throughput capacity analysis of the InfWMNs in which the infrastructurenodes are located randomly In this study we considered two different scenarios to examine the asymptoticper client throughput capacity of multi channel InfWMNs In the first scenario it is assumed that the locationof wireless mesh routers and gateways can be selected Conversely in the second scenario while the locationof gateways can still be selected the wireless mesh routers are distributed in the unit disk randomly In bothscenarios mesh clients are randomly distributed within the area of the network Our analysis reveals that theasymptotic per client throughput capacity of the multi channel InfWMNs has different bounds depending onthe ratio of c to m In addition to that for the case of there is a reduction in the capacity of theInfWMNs compared to the case that c m In the first scenario our analytical solutions prove that when where and denote the number of gateways and mesh routers respectively the gatewayscannot effectively increase the throughput capacity of the multi channel InfWMNs However in the second scenario it is demonstrated that when the number of interfaces per each infrastructure nodehas no effect on the throughput capacity of the multi channel InfWMNs Key WordsNetwork topology Network communications Throughput capacity Wireless mesh networks Multiple interfaces Multiple channels

منصوري، محمد

تحليل ظرفيت بازدهي در شبكه هاي مش بي سيم بزرگ، بررسي اثر عدم برابري تعداد كانال هاي ارتباطي و رابط هاي بي سيم

همبندي شبكه , ارتباطات شبكه , رابط هاي چند گانه , كانال هاي چند گانه