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Transparent Mobile and Priority IP
60%, 1998-1999

This research, relative to terminals that use IP protocol, has been developed in two steps: mobility implementation and priority management in Internet access. As transparent mobility we intend the possibility to move a terminal from the network where it's usually connected to a different one without change its IP address; while as priority management we intend a mechanism that allows giving to the terminals different usable capacity of the available bandwidth. Than, terminals mobility problem, has been extended to the case of multicast communications effecting some changes in the existent multicast tree generation protocols in order to solve the problems relative to terminals moving, whatever they are source or destination of the information. Routing problems are related to packages delivery failure, terminal mobility degree and the overhead imposed to the portion of interested network. For both mobility implementation and priority management has been proposed the ideation, the characterization and the implementation of appropriate server called Network Agent that have to guarantee those functions in a transparent way, namely without any change in software or configuration of the terminals. The project involves a phase of theoretical analysis with the aim to characterize the transparent mobility problem that emphasize the Network Agent base functions relative to communication between fixed and mobile terminals and between mobile terminals only. Particular emphasis has been given to the optimization of the packages routing in order to avoid redundant path, thus we could obtain performances comparable with those relative to communication between fixed terminals. Agent activities are ruled by some temporal parameters which depend on the networks utilization and on the terminals mobility features; thanks to the proposed system that times has been analytically studied with the aim to provide optimization tools. It has been proposed an implementation of this system followed by a phase of test-bed which has involved Ferrara University and others Italian University.

Regard to the problem of terminals mobility in the case of multicast communication has been done a theoretic analysis of the performances in terms of delay and jitter with aim to evaluate the impacts on services with particular temporal requirements. In this field we have investigated techniques to decide the amount of bandwidth to be assigned at each user based on priority mechanisms. Those techniques, together with combined algorithms of retransmission and errors recovery, have permit to consider systems with multimedia sources in which is required the definition of a specified quality of service. With regard to priority management we have defined the concept of priority class of the users and we have been proposed a transparent assignment mechanism of the resources for each station managed by an Agent. Particular emphasis has been given to the assignment optimization of the resources by means of a study that identify particular cost functions based at least on the priority class and on the connection quality with the destination. The introduced control is done on both the outgoing and incoming traffic of the network and in the last case it happens indirectly by working with opportune signal packages.


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