2021 : THE IMPROVEMENT OF FORWARDING NODE SELECTION METHOD BASED ON SPEED AND DIRECTION FACTOR ON GREEDY PERIMETER STATELESS ROUTING PROTOCOL IN VANETS
Prof.Ir. Supeno Djanali M.Sc Ph.D
VANETs (Vehicular ad hoc networks) are technologies used for communication between vehicles. In VANETs, vehicles move at different speeds and directions, causing the communication network to change rapidly. One example of the routing protocol that is often used in VANET communication is GPSR. Greedy perimeter stateless routing (GPSR), a new routing protocol for wireless networks that uses the posi-tion information of the destination node to make packet forwarding decisions. VANETs network topology which is very dynamic causes communication between nodes is not stable. The next hop node that has been selected may be out of transmission range before receiving the packet. This study aims to solve prob-lems in the GPSR routing protocol related to communication instability because the position of the node changes in greedy forwarding mode. In this study the authors add a set of parameters used to make routing decisions by entering the speed and direction of vehicle movement factors. Each node will calculate the geometric mean of its speed before broadcasting the beacon message. Information about the geometric mean will be added to the beacon message. After the node receives the beacon message packet, the node will update the information contained in the neighbor table. In this study, the neighbor table also stores node position information in the previous time and geometric average velocity information. Information in the neighbor table will be used in routing decisions. This study also made modifications to the method of forwarding the greedy forwarding package. If packet forwarding uses the greedy forwarding method, the first step is to find the nodes that are in the optimum communication area. Furthermore, from the nodes in the optimum communication area, forwarding selection will be selected. Nodes that deserve to be forward-ing nodes are nodes that have the least minimal geometric difference in speed and move toward the desti-nation node. It is hoped that this research can improve the performance of the GPSR routing protocol.