Vítor Jesus - personal webpage

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(written in 5 minutes) I am particularly interested in understanding the interactions between domains (e.g. operators or service providers) that arise from forced cooperation in order to provide a end-to-end service deifned in terms of the technology-agnostic end-user. This is the interdomain problem and whenever two domains engage in cooperation we say an act of federation has occurred. These acts of federation, in its multiple perspectives (statement, implementation, enforcement, verifiability, etc.) must be understood.
For example, imagine that a user connects to the internet using a hotspot and tries to make a VoIP call to a friend in a distant country. On one hand, the data packets may cross many networks that may belong to different owners (that may even don't know each other as it happens today); on the other hand, the signalling to setup the call may need to involve many domains for a number of functions (e.g., billing, call-termination and peer discovery, QoS request, etc.).
Specifically, my work will deal with three general problems:
· How to enhance the network in order to extend intradomain features (QoS, mobility, group communications, security, privacy, etc.) to interdomain scenarios?
· from the perspective of a service provider, how does business impact technology? Specifically, how does competition and cooperation ("coopetition"?) impact end-to-end service building? Network operators sharing resources (e.g., antennas and backbones) is an illustrative scenario that can take two shapes: users hop around the filed without any knowledge that they're using different providers and users choosing a provider. GSM roaming provides a hint to how things will look like in the future.
· Considering that we face progressive specialization (small providers and/or break-down of vertical and big providers, e.g., access, transport, service, management, ...), how to build a service if we have to involve many domains with complex federation acts?

Overall, my research interests are the following:
· Quality-of-Service: assurances in packet switched networks, mapping access services in core services, QoS models for ad hoc networks
· Mobility: Mobility architectures, global/local problem splitting, mobility impact on network planning
· Interdomain: Impact of interdomain on intra-domain technologies, service building using many providers

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