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Reducing duplicate packets in Unicast VANET communications

Abstract:

In vehicular networks, the packet losses in the path between source and destination occur due to packet collisions, fast movement and a limited communication range of vehicles. Reliability mechanisms at different layers are used to mitigate the impact of this issue. In this work, we explain how the loss of ACK frames at MAC layer in conjunction with the recovery procedure of VANET routing protocols lead to an unexpected generation of duplicate packets. Also, we propose a duplicate packet filtering at routing layer to prevent the propagation of unnecessary packet copies and therefore increasing the available bandwidth. To evaluate the behavior of our proposal to minimize the duplicate packets in against not to use any filter, we use MMMR routing protocol, a geographical routing protocol for VANETs and carried out simulations with different vehicle densities in a urban scenario. Our results show that our approach is effective reducing the load of the network in terms of routing operations, idle time, the total number of frames transmitted and end-to-end delay. These improvements are related to a minimum degradation of the packet delivery ratio. Copyright is held by the owner/author(s).