DDRC: Data Dissemination in Vehicular Networks Using Rateless Codes *
Mohsen Sardari, Faramarz Hendessi, Faramarz Fekri · 2010
In this paper, we address the problem of delivering multimedia content to a sparse vehicular network from roadside info-stations, using efficient vehicle-to-vehicle col-laboration. Due to the highly dynamic nature of the underlying vehicular network topol-ogy, we depart from architectures requiring centralized coordination, reliable MAC scheduling, or global network state knowledge, and instead adopt a distributed paradigm with simple protocols. In other words, we investigate the problem of reliable dissemina-tion from multiple sources when each node in the network shares a limited amount of its resources for cooperating with others. By using rateless coding at the Road Side Unit (RSU) and using vehicles as data carriers, we describe an efficient way to achieve reli-able dissemination to all nodes (even disconnected clusters in the network). In the nut-shell, we explore vehicles as mobile storage devices. We then develop a method to keep the density of the rateless coded packets as a function of distance from the RSU at the desired level set for the target decoding distance. We investigate various tradeoffs in-volving buffer size, maximum capacity, and the mobility parameter of the vehicles.