Towards improving internet performance

申请人最近的工作一直关注于处理当前Internet中存在的一些性能和QoS（服务质量）问题，特别是对延迟和数据包丢失敏感的非弹性应用程序。当前的因特网最初被设计为支持扁平的、弹性的应用程序，这些应用程序对延迟相对不敏感，并且可以通过重传来处理数据包丢失。现代应用程序，如视频流和协作工作，需要及时交付和QoS保证级别。在很多情况下，长传播延迟本身就会导致重传不可行，而由于拥塞和路由不良导致的转发延迟使问题更加复杂。此外，当前Internet上的服务是以网络为中心的，而现代需求更多地以用户/应用程序为中心。因此，近年来申请人在web缓存、负载敏感动态路由、组播、MPEG流传输中维护QoS的丢弃策略、基于dht的P2P网络中的路由改进、大规模网络的仿真工具、保留路由的路由故障恢复等方面做了大量工作。

Recent work by the applicant has been concerned with dealing with some of the performance and QoS (quality of service) issues which exist in current Internet, particularly for inelastic applications that are sensitive to delay and packet loss. The current Internet was originally designed to support flat, elastic, applications which are relatively insensitive to delay and where packet losses could be handled by retransmissions. Modern applications, such as video streaming and collaborative work require timely delivery and a QoS assurance level. Long propagation delays, by itself, makes retransmission infeasible in many cases and forwarding delays due to congestion and poor routing compound the problem Furthermore, services on the current Internet are network centric, whereas modern needs are more user/application centric. Thus, in recent years the applicant has done work on web caching, load sensitive dynamic routing, multicasting, discard policies for QoS maintenance in transport of MPEG streams, routing improvement in DHT-based P2P networks, simulation tools for large scale networks, route failure recovery for reserved routing.