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To accommodate a wide variety of application services, the network virtualization environment (NVE) has received much attention. In an NVE, infrastructure providers (InPs) provide service providers (SPs) with virtual networks (VNs) using the InPs' substrate resources for the SPs' application services. Service providers have flexible requirements of topology, quality of service (QoS), and their dynamic...
A small link bandwidth can lead to insufficient capacity and delay problems. Header compression can reduce the amount of packet header to make link utilization more efficient, but this compression technique introduces a longer processing time and may increase end-to-end delay. In time-sensitive applications such as VoIP, this additional delay is unacceptable since high network latency can lead to...
The overhead portion especially for a small packet is one of the most significant parameters that can lower the efficiency of the link utilization. Therefore, many traditional hop-by-hop header compression techniques were introduced to reduce the amount of packet header before transmission. However, those techniques still cannot overcome the time performance issue as compression mechanism requires...
Handover events are a source of instability in a mobile environment, but they are unavoidable. In particular, a significant cause of quality degradation is handovers to congested access points. These cause packet drops, longer RTT, and less available bandwidth for the flow being handed over. Such performance degradation may not be acceptable with respect to the transport protocols. Through simulations,...
The Internet architecture has been reconsidered along with newly emerging diverse Internet applications, and cooperation between applications and networks becomes desired. Inherently, an application service provider concentrates on serving its own application with the high performance while an infrastructure service provider needs to consider an efficient and fair use of its physical resources to...
Shortening the channel change time is a critical issue in Internet protocol television (IPTV), and many methods have been proposed to address this issue. However, since these methods do not take into account the Internet group management protocol (IGMP) load on multicast routers, the number of IGMP packets will increase significantly, which will cause network instability. To investigate the effect...
Real-time communication services such as VoIP, IPTV, and streaming video continue to spread rapidly. Delay and packet loss strongly affects the quality of service of realtime communication services, though, so analyzing these performance metrics is essential. Such analysis is difficult, however, because of (1) the convolution of multiple arriving flows, which means we cannot use the memory-less property,...
The variety of Quality of Service (QoS) requirements from applications is increasing and overlay networks are spreading widely. Because of this, a means of flexibly supporting various applications, including overlay network applications, must be devised. In this paper, we describe an inter-ISP virtual backbone infrastructure designed to flexibly meet various QoS requirements. In our infrastructure,...
Since the TCP transmission rate is low during the startup phase, the QoS of various applications is seriously degraded. To improve the TCP transmission rate in the startup phase, many fast startup algorithms have been proposed. In this paper, we evaluate the fundamental performance of fast startup algorithms. Specifically, we focus on the initial window size and Rate-Based Pacing (RBP) start method,...
In P2P file sharing, problems can occur due to harmful content distributed by malicious peers and many solutions using reputation management have been proposed. However, none of these solutions are effective in relay-transfer P2P file sharing where a peer automatically relays content and creates content caches. This is because all the existing solutions only allow an evaluation of the peers without...
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