Improved Selection of the Best Forwarding Candidate in 3MRP for VANETs The design of different metrics in hopbyhop routing protocols for vehicular ad hoc networks (VANETs) has been investigated with the clear objective to improve the performance of VANETs in terms of packet losses and average endtoend delay. However, the best way of combining these metrics to compute a multiscore value for each candidate node to choose the best forwarding one, is an open issue yet. Based on a previous designed routing protocol called Multimedia Multimetric MapAware Routing Protocol (3MRP), a detailed analysis of the power mean function is done to determine which form of metrics combination will give the best results in terms of packet losses and average endtoend delay. Extensive simulations have been conducted indicating that the geometric mean has obtained the lowest average percentage of packet losses.

An Enhanced GPSR Protocol for Vehicular Ad hoc Networks Several routing protocols have been proposed for ad hoc vehicle networks. They affect directly but differently the quality of the transmitted data. In this paper, we introduce a multipath feature to decrease packet loss in greedy perimeter stateless routing protocol (GPSR). Since using only one path during transmission may cause packet loss due to congestion and saturation in this path. Our enhancement is based on sending the same packet over two different paths to maximize its reception probability. This scheme is evaluated in a highway environment using Omnet, Veins, and SUMO. The results show that the proposed solution overcomes GPSR in packet delivery ratio.