مدل سازی و بهینه سازی پروتکل کشف محتوا گام تصادفی بر سر شبکه های ad-hoc موبایل
|کد مقاله||سال انتشار||مقاله انگلیسی||ترجمه فارسی||تعداد کلمات|
|70557||2014||12 صفحه PDF||سفارش دهید||9133 کلمه|
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Performance Evaluation, Volume 74, April 2014, Pages 18–29
Content discovery is one of the challenges over mobile ad-hoc networks. Peer to peer content discovery techniques including structured and unstructured can be employed in MANETs by considering its special characteristics and limitations. The most important characteristics of MANETs are the mobility of the nodes, power consumption limitations and transitive links which create a dynamic topology. Unstructured techniques present higher performance compared to the structured ones over MANETs and among unstructured peer to peer protocols, Random Walk delivers less energy consumption and satisfactory hit rate awhile. This paper proposes an adaptive method to optimize the random walk unstructured content discovery protocol. First, it models this protocol using the G-network which is a queuing system with two types of customer, negative and positive. Then, it optimizes this protocol by the gradient descend technique based on a cost function which consists of three parameters. Two of these parameters are hit rate and response time which are derived from the content discovery protocol performance metric. The other parameter is energy consumption which is one of the most important performance metrics in MANET.