Dynamic ring-based forwarder selection to improve packet delivery in ultra-dense nanonetworks
Résumé
Nanotechnology is a revolutionary field of science and the design of nanometer-sized devices opens the door to a wide range of novel applications. Electromagnetic nanonetworks are networks of nanodevices communicating in the terahertz band. Nanonetworks can be ultra-dense, which makes it a very challenging environment for traditional routing protocols. In face of extreme density, they tend to either select too many forwarders or devote too many resources to find a small and optimal subset. Selecting too many forwarders means that the channel will be encumbered by many copies of the same packet and a lot of power will be drained. On the other hand, trying to select a small and optimal subset of forwarders incurs an initially prohibitive computational and communication overhead. Therefore, we previously proposed a ring mechanism that can be applied under existing protocols and optimize their behavior. However, the proposed ring had a fixed width, which was manually set and did not adapt to the local density, an important parameter in heterogeneous networks. In the current article we solve this problem by automatically selecting the ring width based on the local node density. Extensive simulations of our scheme applied to four routing protocols, using a dense nanonetwork simulator, show a dynamic ring that drastically reduces the number of forwarders used for transmission in the network, without sacrificing the packet delivery ratio and thus optimizing the network usage.
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