No abstract

In an Optimized Link State Routing (OLSR)-based mobile wireless network, optimizing the flooding of broadcast messages is a challenging task due to node's mobility and bandwidth resource consumption. To complement existing solutions to this problem, the Multi-Point Relays (MPR) selection has recently been advocated as a promising technique that has an additional feature of reducing the number of redundant re-transmission occurring in the network. This paper continuous on the investigation of an existing MPR-based solution, arguing that by considering a cost factor as an additional decision parameter in selecting the MPR nodes, the enhanced MPR selection algorithm leads to less packet loss in the network. Simulation experiments are presented to validate the stated goal, using the average packet loss ratio as the performance metric.

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In this paper, we proposed a novel routing protocol called Geographic Member-Centric Routing (GMR) over a VANET that consists of a platoon of vehicles, which have the same starting point, driving route, and destination point, driving in the highway environment. The goal of GMR is to aggregate 3G/3.5G bandwidth from some vehicles called Helpers to a vehicle called Requester, i.e., it belongs to multiple-source single-destination transmission, to have cooperative video streaming service in the platoon of vehicles. For providing a better cooperative video streaming service in the platoon scenario, we (1) utilized the characteristic of platoon mobility, in which platoon members try to drive with each other as close as possible and (2) proposed a member-centric scheme that routes packets through more stable links between platoon members. We also introduced a concept of flow-merging, using which k-hop nodes would forward packets to 1 or more merge-nodes in (k-1)-hop, to reduce interference and packet collision between multiple flows. According to the simulation results, GMR effectively improves the packet delivery ratio and throughput using our proposed member-centric scheme and flow merging scheme. It also shows that the proposed member-centric routing protocol is more suitable than others for 3G/3.5G bandwidth aggregation in the platoon scenario over VANET.