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- 저자 : ( Shanzhi Chen ) (검색결과 3 건)
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Cellular Traffic Offloading through Opportunistic Communications Based on Human Mobility
( Zhigang Li ),( Yan Shi ),( Shanzhi Chen ),( Jingwen Zhao ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.3
The rapid increase of smart mobile devices and mobile applications has led to explosive growth of data traffic in cellular network. Offloading data traffic becomes one of the most urgent technical problems. Recent work has proposed to exploit opportunistic communications to offload cellular traffic for mobile data dissemination services, especially for accepting large delayed data. The basic idea is to deliver the data to only part of subscribers (called target-nodes) via the cellular network, and allow target-nodes to disseminate the data through opportunistic communications. Human mobility shows temporal and spatial characteristics and predictability, which can be used as effective guidance efficient opportunistic communication. Therefore, based on the regularity of human mobility we propose NodeRank algorithm which uses the encounter characteristics between nodes to choose target nodes. Different from the existing work which only using encounter frequency, NodeRank algorithm combined the contact time and inter-contact time meanwhile to ensure integrity and availability of message delivery. The simulation results based on real-world mobility traces show the performance advantages of NodeRank in offloading efficiency and network redundant copies.
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Distributed and Weighted Clustering based on d-Hop Dominating Set for Vehicular Networks
( Yan Shi ),( Xiang Xu ),( Changkai Lu ),( Shanzhi Chen ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.4
Clustering is one of the key technologies in vehicular networks. Constructing and maintaining stable clusters is a challenging task in high mobility environments. DWCM (Distributed and Weighted Clustering based on Mobility Metrics) is proposed in this paper based on the d-hop dominating set of the network. Each vehicle is assigned a priority that describes the cluster relationship. The cluster structure is determined according to the d-hop dominating set, where the vehicles in the d-hop dominating set act as the cluster head nodes. In addition, cluster maintenance handles the cluster structure changes caused by node mobility. The rationality of the proposed algorithm is proven. Simulation results in the NS-2 and VanetMobiSim integrated environment demonstrate the performance advantages.
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Modeling and QoS Analysis of the IEEE 802.11p Broadcast Scheme in Vehicular Ad Hoc Networks
리바오주,Gordon J. Sutton,Bo Hu,Ren Ping Liu,Shanzhi Chen 한국통신학회 2017 Journal of communications and networks Vol.19 No.2
Quality of service (QoS) and queue management arecritical issues for the broadcast scheme of IEEE 802.11p systemsin vehicular ad hoc networks (VANETs). However, existing 1-dimensional (1-D) Markov chain models of 802.11p systems areunable to capture the complete QoS performance and queuingbehavior due to the lack of an adequate finite buffer model. We present a 2-dimensional (2-D) Markov chain that integratesthe broadcast scheme of the 802.11p system and the queuingprocess into one model. The extra dimension, which models thequeue length, allows us to accurately capture the important QoSmeasures, delay and loss, plus throughput and queue length, forrealistic 802.11p systems with finite buffer under finite load. Wederive a simplified method to solve the steady state probabilitiesof the 2-D Markov chain. Our 2-D Markov chain model is thefirst finite buffer model defined and solved for the broadcastscheme of 802.11p systems. The 2-D model solutions are validatedby extensive simulations. Our analyses reveal that the lack ofbinary exponential backoff and retransmission in the 802.11psystem results in poor QoS performance during heavy trafficload, particularly for large VANETs. We demonstrate that ourmodel provides traffic control guidelines to maintain good QoSperformance for VANETs.
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