Abstract-Data communication in Vehicular Delay TolerantNetworks (VDTN) poses serious challenges on file transferring due to intermittent connectivity and packet loss. To improve file transfer in VDTN, we propose a mechanism that includes fountain coding in the application layer, UDP in the transport layer, and AODV-DTN in the network layer in our new architecture. Of the characteristics of fountain codes is that the source data can be rebuilt thoroughly from any subset of the encoded packets at destination. Furthermore, no feedback is required to guarantee reliable delivery. Therefore, we use UDP in contrast to classical use of TCP, while reliability is still preserved. A new routing algorithm, named AODV-DTN, is presented and developed in the network layer based on AODV and Store-Carry and Forward policy. The cross-layer mechanism is used as an alternative to preliminary layer design so as to develop communication between the network layer and application layer. We have conducted extensive simulations to evaluate the performance of our architecture. The results show that our architecture outperforms in terms of file delivery ratio and byte throughput when compared with FOUNTAIN and classic FTP scenarios. In addition, the negative effect of increasing file size is mitigated in the proposed architecture in comparison to other alternatives. It is shown that for delay tolerant and long-distanced inter-RSU communications the proposed architecture behaves sufficiently well.
We propose a mechanism for facilitating file transferring in Vehicular Delay Tolerant Networks. The proposed architecture includes using Fountain coding in the application layer, UDP in the transport layer and a proposed DTN routing algorithm in the network layer. It is assumed that files are coded based on a sample of Fountain codes which does not need in-order reception of packets. As a result, there is no need of using close-loop reliable protocols such as TCP, hence suffering from their different overheads; as a result, UDP can be used in the transport layer. In the network layer, we propose a novel DTN routing algorithm based on AODV and Store-Carry and Forward policy. This algorithm (named as AODV-DTN) uses a cross layer interaction between the network and the application layer. Results of extensive simulations study for highway scenarios show that the proposed architecture leads to a better performance in terms of file delivery ratio and byte throughput when compared with FOUNTAIN and classic FTP scenarios. Furthermore, the negative effect of increasing file size is mitigated in comparison to other alternatives. It is also shown that for delay tolerant and long-distanced inter-RSU communications the proposed architecture behaves sufficiently well
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