The main reference of the research carried out in SCNL is the Quality of Service (QoS) management in heterogeneous networks wired, satellite and wireless portions). The scientific-technological objective is to eliminate the differences among the heterogeneous portions of the network through the definition and the use of appropriate interfaces and algorithms that make transparent interconnection of various components of the network and offer specific quality assurance to the users.
In the last years various applications emerged, in which networks operate under conditions in which the assumptions of “universal connectivity” and “global information” do not hold (e.g. sensor networks, pocket switched networks, vehicular ad-hoc networks and interplanetary networks). A common denomination of these networks is Intermittently Connected Networks. As in such contexts the networks may be disconnected most of the time or it may even happen that there is never an end-to-end path available between source and a destination, classical routing and congestion control algorithms fail. Delay Tolerant Networking paradigm has been proposed to cope with the challenges and issues of ICNs. Inside this framework, different research topics are studied:
Nanosatellite Networks for Rural Access
- M. Cello, M. Marchese, F. Patrone, "Hot Spot Selection in Rural Access Nanosatellite Network", Ninth ACM MobiCom Workshop on Challenged Networks 2014, CHANTS 2014, Maui, Hawaii, USA.
Routing Algorithms in Interplanetary Networks
- C. Caini, R. Firrincieli, T. de Cola, I. Bisio, M. Cello, G. Acar, "Mars to Earth Communications through Orbiters: DTN Performance Analysis", International Journal of Satellite Communications and Networking, Volume 32, Issue 2, pages 127–140, March 2014.
- I. Bisio, M. Cello, T. de Cola, M. Marchese, “Combined Congestion Control and Link Selection Strategies for Delay Tolerant Interplanetary Networks”, Proc. IEEE Global Communications Conference, GLOBECOM 2009, 30 Nov.- 4 Dec. 2009, Honolulu, HI, USA.
Software Defined Networking (SDN) is revolutionizing both the networking industry by enabling programmability, easier management and faster innovation, and the research community allowing the study and the independent evolution of the control and data planes, not more sticked with the concept of the distributed control plane. One important aspect of SDN paradigm is related to the scalability issues: decoupling data and control planes brings about scalability concerns, and moving traditionally local control functionalities to a remote controller can potentially result in new bottlenecks.
Each research topic has implicated the design and development of tools for the simulation and the emulation of the networks considered. This activity is very important to consolidate, through experimental phases, the described research topics.
- Some of the designed and implemented tool of the laboratory are described in the Tools.
This activity deals with the bandwidth assignment among transmitting entities accessing a common wireless, radio or satellite channel. This allocation is performed depending on the traffic characteristics and requirements as well as the channel conditions. The allocation process is focused on assuring QoS guarantees to traffic flows and power consumption minimization for each transmitting entity. These objectives conflict because the higher is the allocated bandwidth, the lower is the packet loss rate or the packet delay but the higher is the transmitted power. The recent research in this field is based on a family of techniques called Multi Objective Programming (MOP), which assure the optimization of conflicting performance metrics such as the aforementioned ones.
- I. Bisio, S. Delucchi, F. Lavagetto and M. Marchese, "Comparison among Resource Allocation Methods with Packet Loss and Power Metrics in Geostationary Satellite Scenarios", Proc. IEEE International Conference of Communications, ICC 2013, 9 - 13 Jun, 2013, Budapest, Hungary.
- I. Bisio, S. Delucchi, F. Lavagetto and M. Marchese, "Capacity Bound of MOP-based Allocation with Packet Loss and Power Metrics in Satellite Communications Systems", Proc. IEEE Global Communications Conference, GLOBECOM 2012, 3-7 Dec 2012, Anaheim, CA, USA (Best Paper Award).