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Profile based routing in vehicular ad-hoc networks

Science China(Information Sciences) 2014年第6期57卷 154-164页

作者： bohlooli ali JAMSHIDI Kamal Department of Computer Engineering Faculty of EngineeringUniversity of Isfahan

One of the main problems in the VANET(vehicular ad-hoc network)routing algorithms is how to establish the stable *** link duration in these networks is often very short because of the frequent changes in the network *** link duration reduce the network *** speeds of the vehicles and choosing different directions by the vehicles in the junctions are the two reasons that lead to link breakage and a reduction in link *** routing protocols have been proposed for VANET in order to improve the link duration,while none of them avoids the link breakages caused by the second *** this paper,a new method for routing algorithms is proposed based on the vehicles trips ***,each vehicle has a profile containing its movement patterns extracted from its trips *** next direction which each vehicle may choose at the next junction is predicted using this profile and is sent to other *** each vehicle selects a node the future direction of which is the same as its predicted *** case study indicates that applying our proposed method to ROMSGP(receive on most stable group-path)routing protocol reduces the links breakages and increases the link duration time.

关键词： vehicle communication VANET stable routing

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An accurate retransmission timeout estimator for content-centric networking based on the Jacobson algorithm

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Digital Communications and Networks 2022年第6期8卷 1085-1093页

作者： Mortaza Nikzad Kamal Jamshidi ali bohlooli Faiz Mohammad Faqiry Faculty of Computer Science Kabul Polytechnic UniversityKabulAfghanistan Faculty of Computer Engineering University of IsfahanIsfahanIran

Accurately estimating of Retransmission TimeOut (RTO) in Content-Centric Networking (CCN) is crucial for efficient rate control in end nodes and effective interface ranking in intermediate routers. Toward this end, the Jacobson algorithm, which is an Exponentially Weighted Moving Average (EWMA) on the Round Trip Time (RTT) of previous packets, is a promising scheme. Assigning the lower bound to RTO, determining how an EWMA rapidly adapts to changes, and setting the multiplier of variance RTT have the most impact on the accuracy of this estimator for which several evaluations have been performed to set them in Transmission Control Protocol/Internet Protocol (TCP/IP) networks. However, the performance of this estimator in CCN has not been explored yet, despite CCN having a significant architectural difference with TCP/IP networks. In this study, two new metrics for assessing the performance of RTO estimators in CCN are defined and the performance of the Jacobson algorithm in CCN is evaluated. This evaluation is performed by varying the minimum RTO, EWMA parameters, and multiplier of variance RTT against different content popularity distribution gains. The obtained results are used to reconsider the Jacobson algorithm for accurately estimating RTO in CCN. Comparing the performance of the reconsidered Jacobson estimator with the existing solutions shows that it can estimate RTO simply and more accurately without any additional information or computation overhead.

关键词： Content-centric networking Retransnissi on timeout Popularity distribution gain Jacobson RTO estimator

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