Performance assessment of fragmentation mechanisms for vehicular delay-tolerant networks

Abstract

Vehicular Delay-Tolerant Networks (VDTNs) are a new approach for vehicular communications where vehicles cooperate with each other, acting as the communication infrastructure, to provide low-cost asynchronous opportunistic communications. These communication technologies assume variable delays and bandwidth constraints characterized by a non-transmission control protocol/internet protocol architecture but interacting with it at the edge of the network. VDTNs are based on the principle of asynchronous communications, bundle-oriented communication from the DTN architecture, employing a store-carry-and-forward routing paradigm. In this sense, VDTNs should use the tight network resources optimizing each opportunistic contact among nodes. Given the limited contact times among nodes, fragmentation appears as a possible solution to improve the overall network performance, increasing the bundle delivery probability. This article proposes the use of several fragmentation approaches (proactive, source, reactive, and toilet paper) for VDTNs. They are discussed and evaluated through a laboratory testbed. Reactive and toilet paper approaches present the best results. It was also shown that only the source fragmentation approach presents worst results when compared with non-fragmentation approaches.

A Cooperative Watchdog System to Detect Misbehavior Nodes in Vehicular Delay-Tolerant Networks

“…In the last years, communications among vehicle have attracted significant attention from the automotive and research community [5][6][7][8][9][10][11][12]. For this reason, cooperation among nodes became an important concern, and several approaches were proposed to incentive them to cooperate.…”

A venues‐aware message routing scheme for delay‐tolerant networks

“…In their algorithm, the forwarding decisions are based on the most recent node encounter probability and the number of message copies. In , the authors used several fragmentation approaches (proactive, source, reactive, and toilet paper) for vehicular DTNs to improve the overall network performance and increase the bundle delivery probability. In , the authors proposed cross‐layer protocol, namely delay and reliability aware routing, where the media access control layer observes the signal to noise ratio, and delay and velocity vector difference metrics for all paths of neighboring nodes; the network layer then could select the best preferable path based on fuzzy inference system.…”

Video Streaming over Vehicular Ad Hoc Networks: A Comparative Study and Future Perspectives

“…As discussed in the aforementioned section, video streaming over vehicular network is a challenging task (Tal and Muntean, 2012;Park, et al, 2006;Ghafoor, et al, 2012;Venkataraman, et al, 2010;Dias, et al, 2011). The problem is more glaringly appear when a video data is transmitted via multi-hop towards a destination.…”