Andrea Polidoro

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High data rate wireless networks enables the provisioning of real time services to mobile devices over IP. At the same time, the different nature of the adopted radio technologies (802.11/WiFi, Bluetooth, 2.5G/3G networks) has introduced the problems of supporting seamless communication across these heterogeneous wireless accesses, which is a goal for 4G(More)
This paper considers two important aspects related to the control plane of Traffic Engineered IP/MPLS networks: the “flooding reduction” mechanisms and the evaluation of processing cost for signaling and routing protocols. The flooding reduction mechanisms are needed to reduce the amount of information exchanged by Traffic Engineering enabled routing(More)
This paper describes a Session Initiation Protocol (SIP) based solution for mobility management that provides seamless mobile multimedia services in a heterogeneous scenariowhere different radio access technologies are used (802.11/ WiFi, Bluetooth, 2.5G/3G networks). The solution relies on the so called “Session Border Controllers” which are now widely(More)
In this paper we discuss a methodology for performance evaluation of the solutions for vertical handovers between different wireless access technologies in IP network. The performance evaluation is based on simple analytical models and covers both the ideal case (no packet loss) and the real case where there is a given packet loss rate. The methodology is(More)
In this paper we report our two years experience in designing and implementing a new middleware solution for distributed mobile applications exploiting the Session Initiation Protocol (SIP) and the JavaScript Object Notation (JSON). The proposed solution has been designed to port the Simple Middleware Independent LayEr (SMILE) framework to mobile devices(More)
The SIP protocol provides authentication and authorization of SIP requests through a challenge-response authentication scheme inherited by the HTTP protocol and named HTTP Digest Authentication. The current specification defines a particular algorithm for calculating the challenge response that uses the MD5 hash of a combination of user name, realm, and(More)
4G systems will need to integrate several IP-based access technologies in a seamless way. In this paper, we first describe the requirements of a Mobility Management scheme for multimedia real-time communication services; then, we report a survey of the Mobility Management schemes proposed in the recent literature to perform vertical handovers between(More)
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