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Online delay-sensitive games with fast interactive actions, like fighting games (FTG) and sports games, require the synchronization of coupled multi-player actions. With network impairments, action commands from other players can be delayed or lost, leading to compromised real-time perception of these games. In contrast to slower strategy games, online fighting and sports games studied in this paper...
In this work, we present a systematic study of how the traffic of different transport protocols (UDP, TCP and ICMP) is treated, in three operational Swedish 3G networks. This is done by studying the impact that protocol and packet size have on the one-way-delay (OWD) across the networks. We do this using a special method that allows us to calculate the exact OWD, without having to face the usual clock...
Active measurement, which can provide end-to-end measurements of network performance, is critical since the Internet is managed by multiple organizations. Recently, on the active measurement of delay and loss, Baccelli et al reported that many probing policies can be used to provide appropriate estimation in addition to the traditional policy based on PASTA property if the volume of probe stream is...
The performance of TCP-based applications depends on the selection of queue management mechanism in network routers and how well its control decisions are made. Fast Congestion Notification (FN) mechanism enables the two control decisions, packet admissions and congestion control directing, to be made together. This permits sending congestion avoidance notification as early as required, even if the...
Synchronization is the fundamental problem of confrontation systems for the reason that the communication pairs should keep pace with each other during traffic jam attacks or eavesdropping. The paper focuses on a strategy of timestamp synchronization which requires no precise clock but a simple timestamp instead to generate right communication information. Thus it can be competent for large-scale...
Stepping-stone attacks in network intrusion detection are attackers who use a sequence of stepping-stone hosts to initiate attacks in order to hide their origins. The goal of this paper is to find algorithms to correctly detect the attacks and have the ability to tolerate the clock skew or/and chaff while exhibiting low time complexity. We propose three novel algorithms for detecting correlation and...
We propose a novel peer-to-peer distributed control architecture for shared haptic collaboration among remotely-located users over undirected packet-switching network (e.g. Internet) with inter-user communication delay. The proposed architecture is distributed, in that each user simulates and interacts with its own local copy of the shared virtual environment. Spring connection among the local copies...
A key component of an efficient multipath routing is theoptimal resource allocation strategy that deals with how thetraffic should be distributed amongst the multiple paths. Inthis paper, an intelligent traffic distribution policy thatminimise the maximum delay in a multipath routing scenariois proposed. It would be proved that such delay minimisationcan be achieved through delay synchronization....
This paper describes our study to develop a system to personalize broadcasting content using the Internet. In the system, the broadcaster provides additional content for personalization via the Internet, which is synchronized with the broadcasting program on air. The receiver combines both types of content to generate a personalized presentation. As a primary implementation, we developed a fundamental...
There is widespread debate regarding the nature of TCP traffic in today's Internet - while some researchers have shown that it exhibits long-range dependent (LRD) properties, others argue that it can be modelled as a Poisson process due to the high degree of traffic aggregation that exists in the core. In this paper, we investigate the nature of TCP traffic as the Internet core moves towards an all-optical...
As bandwidth in the Internet continues to grow, there will be more and more long fat network pipes with abundant residual bandwidth. At the same time, there is also a gradual and steady increase in the deployment of Internet endpoints equipped with different variants of high speed TCP. In this work, we first illustrate drawbacks associated with two widely deployed high speed TCP variants, namely:...
Peer-to-Peer (P2P) live streaming technology has been proved to be one of most successful way to provide live video services over the Internet. Although such approach is very attractive, current provided services could not satisfy all users' Quality of Experience (QoE). Suppose in a small group, when users all watching a live TV program, such as a live soccer game, some peers might saw a goal minutes...
Two techniques have been proposed in the literature to improve the scalability of QoS scheduling in the core of the Internet: flow aggregation and dynamic packet scheduling (DPS). These techniques reduce or eliminate the amount of state maintained by each router in a core network. Flow aggregation combines multiple individual flows into a single aggregate flow (and thus reducing the per-flow state...
The well-known DTN divides an end-to-end communication path into hop-by-hop sessions and allows asynchronous message delivery over physically delayed or disrupted network environments. They have introduced bundling, an overlay network for delay tolerant networking in its architecture, which should be globally deployed and operated with tremendous effort. In this paper, we propose a new DTN architecture...
We address the following question in this study: Can a network application detect not only the occurrence, but also the location of congestion? Answering this question will not only help the diagnostic of network failure and monitor server's QoS, but also help developers to engineer transport protocols with more desirable congestion avoidance behavior. The paper answers this question through new analytic...
One-way network delay is a critical parameter in VoIP as it allows the application to assess the perceived quality. However, it is well known that it is very difficult to measure one-way delay of the VoIP packets traversing the network. This is because the Internet architecture is based on the end-to-end principle in which the endpoints are connected to the network independently, typically without...
In this letter, we question the superiority of current RED, PI and REM active queue management algorithms by proposing an improved droptail gateway. This improved drop tail adopts random packet drop to avoid global synchronization and deadlock of traffic flows; it also try to keep the instantaneous queue size around the predefined value. The simulation results manifest that this improved drop tail...
WiBro (Mobile WiMAX) is a broadband wireless internet service supporting for fixed, portable and mobile users, but enhancement of service quality in indoor environment is still necessary. WiBro femtocell is developed to expand cell coverage, increase system capacity and offer various multimedia service with high throughput in indoor environment. Three types of femtocell are designed according to the...
End-users who want to receive real-time streaming data on the Internet must first obtain the session information. A session information distribution system that distributes the available session information to all potential receivers must be scalable and work with low latency. We present the design and implementation of a session information distribution system using multiple session agents. This...
This paper adopts a method of linear fitting to create a model of clock drift rate, and uses this drift rate to adjust time and analyze stability. The paper makes three major contributions to this research area. Firstly, the slave node uses local time and the arrival timestamps, from the reference server, to create offset trend equation, and to retrieve the drift rate of slave node. Secondly, the...
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