A New Improved GPSR (GPSR-kP) Routing Protocol for Multimedia Communication over Vehicular Ad hoc Network

One of the main constraint in front of Vehicular Ad hoc Networks (VANETs) is delivering the data in efficient time. This paper provides an improved Greedy Perimeter Stateless Routing protocol (GPSR) to enhance the video quality transmission over VANETs. We propose to adapt the mechanism of GPSR through a modification on greedy process. This latter uses only one single hop to send packets, while that there could exist another valid hop to transmit another packet instead of making it wait a fairly long duration and therefore increasing the average delay of a complete message. Our enhanced variant of GPSR named GPSR-kP (GPSR with k Packets), allows to use a number k, limited between one and six, of neighbours close to the destination and necessary to transfer the k number of packets possessed by a same source node which takes into account if they have the same final destination or not. We evaluate GPSR-kP protocol in urban scenario with obstacles using a real video clips to demonstrate its feasibility for real videos. Our experimental results show the ability of the GPSR-kP to overcome the observed problem and to improve the performance of GPSR.