CAREER: Internet Telephony Services and Mobile Multimedia Services

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The proposed research project is focused on Internet telephony and novel ad-hoc data distributiontechniques. In the area of Internet telephony research, the research proposes to focus on the following topics: Programming Internet telephony services: The research proposes new mechanisms for programming In-ternet telephony services, usable by both end users and service providers. The mechanismsare designed to be robust, offer predictable performance and allow a large set of users tosafely share server resources. The programming facilities are to be enhanced with a graphicalservice creation environment for Internet telephony. Feature interaction: The research plans to investigate the problem of feature interaction in Internet telephony, as the feature interaction problem differs significantly from that encountered in traditionaltelephony. Collaborative call filtering: The research plans to design, implement and analyze a system that allows Internet users to collaborate in filtering undesirable calls, based on group preferences. Thisavoids the current reliance on unlisted phone numbers and answering machines for call filtering. Scaling Resource Reservation: Particularly for the large number of small flows anticipated forInternet telephony, associated with their stringent delay and loss requirements, scaling resourcereservations is of vital importance. The research proposes to investigate the performance of twonew scaling mechanisms, sink-tree reservations as part of the Border Gateway ReservationProtocol (BGRP) and partial reservations. Performance prediction: The research plans to investigate simple statistical characterizations that predictthe performance of a variety of standard forward error correction and playout delay algorithmsfor packet voice. 911 services: Internet telephony offers the opportunity to significantly enhance emergency callservices compared to existing mechanisms. The research plans to investigate how to reliably identifyusers and grant temporary access to personal data to medical personnel, without having tostore medical data in centralized locations. Mobility: The research proposes to investigate application-layer mobility mechanisms to complement traditional IP-layer mobility, potentially affording greater security and faster hand-off, with nonetwork infrastructure modifications required. In addition, the research proposes a new data and media distribution system, e*meme, that allows data topropagate in ad-hoc networks where network nodes are only sporadically connected to the wide-areanetwork, as is the case in areas where wireless connectivity is spotty. The research plans to investigateefficient, popularity-based cache replication algorithms, taking into account the particular considerationsof power- and storage-limited mobile computers.