Improving reliable broadcast over asymmetric VANETs based on a RSSI-voting algorithm

An asymmetric link problem is a considerable effect in vehicular network, but usually overlooked by many researchers. Most of researches concerning this problem are extensions on unicasting routing protocols which have a primary route of data transmission. However, reliable broadcasting protocols such as Density-Aware Reliable Broadcasting protocol (DECA) have no exact route for sending data but do data dissemination. Therefore, in this paper, we focus on making a solution for broadcasting protocols. Specifically, we design a method to select the most efficient preferred node with broadly transmission range and vastly neighbor coverage. In this paper, we propose a RSSI-Voting algorithm as a new node selection algorithm. Each node votes a neighbor who has the highest Received Signal Strength Indicator (RSSI). When a sender wants to broadcast a message, it will select a preferred forwarder node who gains a majority vote. The simulation results show that our mechanism can improve protocol performance up to 17% and decrease its retransmission overhead up to 28%.