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Published byChristopher Beasley Modified over 9 years ago
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A NOVEL SOCIAL CLUSTER-BASED P2P FRAMEWORK FOR INTEGRATING VANETS WITH THE INTERNET Chien-Chun Hung CMLab, CSIE, NTU, Taiwan
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OUTLINE Introduction Social cluster-based overlay structure Lifetime-aware flooding scheme Connectivity-aware retrieval scheme Performance Evaluation Conclusions
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INTRODUCTION Non-safety related applications in VANETs o Improve driving comfort o Provide interesting entertainment services Two different types of communications: o Inter-Vehicle Communication o Roadside-to-Vehicle Communication Two important elements defined in VII (Vehicle Infrastructure Integration): o RSU(Road Side Unit) o OBU(On Board Unit)
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INTRODUCTION Peer-to-peer(P2P) system: o Efficiently access different types of data o Leverage each peer’s resource o Reduce the load of original content provider Main components of P2P system: o Resource discovery scheme o Resource retrieval scheme
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INTRODUCTION Goal: To design a P2P framework for hybrid network(VANET and Internet) o Fixed peer: original peers in thee Internet o Mobile peer: moving vehicles o Challenge: Enable mobile peers to request and retrieve resource efficiently according to connectivity and environment
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INTRODUCTION Framework: Interest-based clustering to group similar peers into a cluster: 1.Social cluster-based overlay structure To eliminate discovering overhead through the RSU 2.Lifetime-aware flooding scheme To eliminate request storm among mobile peers 3.Connectivity-aware retrieval scheme Take lifetime and bandwidth into consideration to select the best peer
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OUTLINE Introduction Social cluster-based overlay structure Lifetime-aware flooding scheme Connectivity-aware retrieval scheme Performance Evaluation Conclusions
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SOCIAL CLUSTER-BASED OVERLAY STRUCTURE Goal: to eliminate the overhead of finding mobile peers. o Group mobile peers and fixed peers into clusters. o Peers with similar interests are group into a cluster. ______
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SOCIAL CLUSTER-BASED OVERLAY STRUCTURE Interest-based intra-cluster construction o One fixed peer and several mobile peers o Mobile peer picks the cluster whose cluster head has the most similar interest with it o Fixed peer acts as the cluster head and maintains file indexes of its cluster
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SOCIAL CLUSTER-BASED OVERLAY STRUCTURE Small-world-based inter-cluster construction o Random walk to reach into different clusters o To increase the ratio of resources that can be found Peers can use overlay to effectively discover resources by requesting the cluster.
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OUTLINE Introduction Social cluster-based overlay structure Lifetime-aware flooding scheme Connectivity-aware retrieval scheme Performance Evaluation Conclusions
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LIFETIME-AWARE FLOODING SCHEME Social cluster-based overlay o Enable mobile peers to discover resources in clusters (through RSUs) Lifetime-aware flooding scheme Help mobile peers to efficiently discover resources through VANETS Connection lifetime must be taken into consideration.
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LIFETIME-AWARE FLOODING SCHEME
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OUTLINE Introduction Social cluster-based overlay structure Lifetime-aware flooding scheme Connectivity-aware retrieval scheme Performance Evaluation Conclusions
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CONNECTIVITY-AWARE RETRIEVAL SCHEME If a mobile peer requests too many blocks at once, it might waste bandwidth. The path quality between two peers must be considered in order to decide how to retrieve data. o Path lifetime o Path bandwidth
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CONNECTIVITY-AWARE RETRIEVAL SCHEME
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OUTLINE Introduction Social cluster-based overlay structure Lifetime-aware flooding scheme Connectivity-aware retrieval scheme Performance Evaluation Conclusions
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PERFORMANCE EVALUATION Network simulator 2 (NS2) Geographic Information System (GIS) 200 fixed nodes in 3000m * 3000m 802.11n standard MAC protocol Transmission range: 250m Transmission rate: 27 Mb/sec 83 kinds of data, 31005 files
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PERFORMANCE COMPARISON SCHEMES Gnutella Interest-based P2P scheme Network-based P2P scheme CarTorrent Social Cluster-based P2P scheme
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PERFORMANCE EVALUATION QUERY HIT RATIO VS. RSU NUMBERS 200 mobile peers Each has 50 cached files
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PERFORMANCE EVALUATION RATIO OF RETRIEVING FILES VS. NUMBER OF RSUS
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PERFORMANCE EVALUATION MESSAGE OVERHEAD VS. NUMBER OF RSUS
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PERFORMANCE EVALUATION QUERY HIT RATIO VS. CACHED FILES
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OUTLINE Introduction Social cluster-based overlay structure Lifetime-aware flooding scheme Connectivity-aware retrieval scheme Performance Evaluation Conclusions
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CONCLUSIONS Design a P2P system that can integrate VANETs and the Internet o Social cluster-based overlay structure o Lifetime-aware flooding scheme o Connectivity-aware retrieval scheme Our work achieves higher discovering rate and retrieving speed than existing schemes.
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