CAREER: Internet Telephony Services and Mobile Multimedia Services

提出的研究项目集中在互联网电话和新型自组织数据分发技术上。在互联网电话研究领域，该研究建议集中于以下主题：规划互联网电话服务：该研究提出了可供终端用户和服务提供商使用的互联网电话服务编程的新机制。这些机制被设计成健壮的，提供可预测的性能，并允许大量用户安全地共享服务器资源。将为因特网电话提供图形化服务创建环境，以加强程序编制设施。特征交互：本研究计划研究网络电话中的特征交互问题，因为特征交互问题与传统电话中遇到的特征交互问题有很大的不同。协作呼叫过滤：该研究计划设计、实施和分析一个系统，该系统允许互联网用户根据群体偏好协作过滤不受欢迎的呼叫。这避免了目前对未列出的电话号码和答录机进行来电过滤的依赖。扩展资源预留：特别是对于预期用于Internet电话的大量小流量，与其严格的延迟和丢失要求相关联，扩展资源预留至关重要。该研究建议研究两种新的伸缩机制--作为边界网关预留协议(BGRP)一部分的宿树预留和部分预留的性能。性能预测：该研究计划调查简单的统计特性，预测各种标准前向纠错和分组语音播放延迟算法的性能。911服务：与现有机制相比，互联网电话提供了显著增强紧急呼叫服务的机会。这项研究计划调查如何可靠地识别用户身份，并向医务人员授予临时访问个人数据的权限，而不必将医疗数据存储在集中位置。移动性：该研究建议研究应用层移动性机制，以补充传统的IP层移动性，潜在地提供更高的安全性和更快的切换速度，并需要修改非网络基础设施。此外，研究提出了一种新的数据和媒体分发系统e*Meme，该系统允许数据在ad-hoc网络中传播，其中网络节点仅偶尔连接到广域网络，就像在无线连接不稳定的地区一样。这项研究计划研究高效的、基于流行的缓存复制算法，并考虑到功率和存储有限的移动计算机的特殊考虑。

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.