Congestion control for vehicular delay tolerant network routing protocols

Oham, Chuka Finbars (2014) Congestion control for vehicular delay tolerant network routing protocols. [Dissertation (University of Nottingham only)]

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The Vehicular Delay Tolerant Network (VDTN) is a special and challenging type of the Delay Tolerant Network because of its high mobility, frequent disconnections and nodal congestion features. These challenging features make it prone to congestion which leads to a considerable amount of message drops in the network. To minimize the impact of congestion in the network, we designed and implemented the Congestion Aware Spray and Wait (CASaW) routing protocol. We varied the buffer sizes of the nodes and conducted multiple experiments using the VDTN routing protocols; the Congestion Aware Spray and Wait (CASaW), the Spray and Wait, the MaxProp, the Epidemic and the Prophet routing protocols. The results obtained after the experiments were used to evaluate the performance of the routing protocols in the congestion prone VDTN in terms of number of messages dropped and messages delivered.

The results showed that the CASaW routing protocol performed fewer drops than all other evaluated VDTN routing protocol as the buffer size of nodes increases. This result implies that the CASaW routing protocol minimizes congestion in the VDTN and this means that more messages are delivered to the destination. This can increase the awareness of drivers in the vehicular environment and so improve road safety. We therefore recommend the implementation of the CASaW routing protocol for the VDTN so as to minimize congestion.

Item Type: Dissertation (University of Nottingham only)
Depositing User: Gonzalez-Orbegoso, Mrs Carolina
Date Deposited: 13 Nov 2015 12:51
Last Modified: 19 Oct 2017 15:05

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