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From virtual reality and telepresence, to augmented reality, holoportation,and remotely controlled robotics, these future network applications promise anunprecedented development for society, economics and culture by revolutionizingthe way we live, learn, work and play. In order to deploy such futuristicapplications and to cater to their performance requirements, recent trendsstressed the need for the Tactile Internet, an Internet that, according to theInternational Telecommunication Union, combines ultra low latency withextremely high availability, reliability and security. Unfortunately, today'sInternet falls short when it comes to providing such stringent requirements dueto several fundamental limitations in the design of the current networkarchitecture and communication protocols. This brings the need to rethink thenetwork architecture and protocols, and efficiently harness recenttechnological advances in terms of virtualization and network softwarization todesign the Tactile Internet of the future.  In this paper, we start by analyzing the characteristics and requirements offuture networking applications. We then highlight the limitations of thetraditional network architecture and protocols and their inability to cater tothese requirements. Afterward, we put forward a novel network architectureadapted to the Tactile Internet called FlexNGIA, a Flexible Next-GenerationInternet Architecture. We then describe some use-cases where we discuss thepotential mechanisms and control loops that could be offered by FlexNGIA inorder to ensure the required performance and reliability guarantees for futureapplications. Finally, we identify the key research challenges to furtherdevelop FlexNGIA towards a full-fledged architecture for the future TactileInternet.

FlexNGIA: A Flexible Internet Architecture for the Next-Generation Tactile Internet