6546

6111

كارشناسي ارشد

مخابرات

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1390

نه، 76ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

مسعودرضا هاشمي

حسين سعيدي، ندا مقيم

14/1/90

نغمه مويديان، علي فانيان

1396/10/10

كتابنامه

برق و كامپيوتر

مهندسي برق و كامپيوتر

ID6111

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

91 Proposing a Load Balancing Algorithm with the Help of an End Point Admission Control Algorithm to Improve Traffic Engineering Zahra Vali z vali@ec iut ac ir 19 9 2011 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Persian Masood Reza Hashemi hashemim@cc iut ac irAbstractThe goal of traffic engineering is to facilitate efficient and reliable network operation and at the sametime optimize the utilization of network resources Multi path routing and load balancing amongmultiple paths are two mechanisms used for traffic engineering From the other point of view theincrease of customers requirements requires the network operators to provide more variety of serviceclasses with end to end guaranteed quality of service Therefore finding a mechanism which is able toprovide a high end to end service granularity is essential Such a mechanism can lead to promptcreation of the next generation network Among all quality of service mechanisms DiffServarchitecture with the help of a call admission control algorithm provides a variety of end to end serviceclasses that does not suffer from scalability problem In this thesis by combining a proper end pointadmission control algorithm with a new load balancing mechanism among multiple paths betternetwork utilization and higher network throughput is achieved Also by reducing hot spots of thenetwork lower end to end delay was obtained compared to single path routing The applied calladmission control mechanism consists of two phases probing phase and data transfer phase Theadvantage of proposed load balancing algorithm is to use information which is gathered by routersalong the path in the probing phase MPA is used as the multipath routing protocol to find availablemultiple paths in the network In the probing phase each user sends one probing packet into each pathto gather required information for both admission control decision and load balancing algorithm Asprobing packets pass the routers each router considers its classes of service and will report theavailable class of service in probing packets even if it is lower than the requested service class andservice vectors will be performed QoS degradation in each of routers along the path is acceptable sinceit may not affect the end to end QoS or users prefer to have QoS degradation than being blocked Sothe decision of load balancing is made with respect to network congestion By using the buffer lengthof the routers as a load balancing criteria a good estimation of end to end delay and packet lossprobability is obtained The result is a proper load balancing according to network resources in everypath Additionally end to end delay was used as a quality of service parameter to choose proper pathsat the destination The proposed network was implemented in OPNET Simulation results show theimprovement which is made by the proposed algorithm in the area of traffic engineering KeywordsMulti Path Routing Load Balancing End point Admission Control QoS

مسعودرضا هاشمي

حسين سعيدي، ندا مقيم

نغمه مويديان، علي فانيان