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Advanced Lectures on Networking Networking 2002 Tutorials by Enrico Gregori, Giuseppe Anastasi, Stefano Basagni

By Enrico Gregori, Giuseppe Anastasi, Stefano Basagni

This booklet provides the revised model of 7 tutorials given on the NETWORKING 2002 convention in Pisa, Italy in may possibly 2002.The teachers current a coherent view of the middle matters within the following areas:- peer-to-peer computing and communications- cellular computing middleware- community defense within the multicast framework- categorizing computing resources in accordance with verbal exchange styles- comments on ad-hoc networking- communique via digital applied sciences- optical networks.

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Due to these resource limitations, heavy-weight middleware systems optimised for powerful machines do not seem to suit mobile 32 C. Mascolo, L. Capra, and W. Emmerich scenarios. Therefore, the right trade-off between computational load and non-functional requirements achieved by the middleware needs to be established. An example of this might be to relax the assumption of keeping replicas always synchronised, and allow the existence of diverging replicas that will eventually reconcile, in favour of a lighter-weight middleware.

We will see examples of this in some of the middleware described in Section 5. Intermittent Connection → Asynchronous Communication. Mobile devices connect to the network opportunistically for short periods of time, mainly to access some data or to request a service. Even during these periods, the available bandwidth is, by orders of magnitude, lower than in fixed distributed systems, and it may also suddenly drop to zero in areas with no network coverage. It is often the case that the client asking for a service, and the server delivering that service, are not connected at the same time.

GSM networks and satellite, WaveLAN [30], HiperLAN [47], Bluetooth [10]) may vary depending on the protocols and technologies being used; reasonable bandwidth may be achieved, for instance, if the hosts are within reach of a few (hundreds) meters from their base station, and if they are few in number in the same area, as, for some of the technologies, all different hosts in a cell share the bandwidth, and if they grow, the bandwidth rapidly drops. Moreover, if a device moves to an area with no coverage or with high interference, bandwidth may suddenly drop to zero and the connection may be lost.

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