DELAY TOLERANCE AND THE FUTURE INTERNET

The Internet protocols were designed to provide end-to-end connectivity across heterogeneous networks, yet primarily assuming a “fixed” and rather static network environment. Mobile and wireless communication have fundamentally invalidated many aspects of these assumptions, for (heterogeneous) wireless access networks and even more so for mobile ad-hoc networks which could be formed between mobile users. This results in challenged networking environments, facing unpredictable and frequently changing connectivity (capacity, error conditions, latency) and node constraints (energy, computing and storage resources), among others. Considering the increasing relevance of wireless communications, we argue that a future Internet architecture should inherently consider challenged networking conditions as a regular case rather than treating them as errors. We identify two important architectural directions and highlight some of challenges to be considered.

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