Piers O'Hanlon

DFLOW: Low latency congestion control

This paper provides an overview of the DFlow congestion control algorithm, which aims to provide for lower delay and lower loss media transport. We provide an evaluation of the algorithm in a simulator which shows that it can provide for self-fairness and low delay operation. Furthermore we demonstrate that it can maintain reasonable throughput against TCP Vegas and LEDBAT.

A Security Architecture for 5G Networks

5G networks will provide opportunities for the creation of new services, for new business models, and for new players to enter the mobile market. The networks will support efficient and cost-effective launch of a multitude of services, tailored for different vertical markets having varying service and security requirements, and involving a large number of actors. Key technology concepts are network slicing and network softwarization, including network function virtualization and software-defined networking. The presented security architecture builds upon concepts from the 3G and 4G security architectures but extends and enhances them to cover the new 5G environment. It comprises a toolbox for security relevant modeling of the systems, a set of security design principles, and a set of security functions and mechanisms to implement the security controls needed to achieve stated security objectives. In a smart city use case setting, we illustrate its utility; we examine the high-level security aspects stemming from the deployment of a large number of IoT devices and network softwarization.