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A bandwidth management scheme is proposed that can support the seamless QoS in face of handoff in mobile networks. The proposed scheme is based on the time-selective bandwidth reservation with the reduced signaling and computational overhead. The reservation parameters are adjusted dynamically to cope with user mobility. Throughout the computer simulations, the performance of the proposed scheme is...
This paper lists various limitations in 2.5G, 3G cellular networks regarding services, and contrasts this to a characterization of fourth-generation wireless networks (4G). In order to investigate 4G’s feasibility, costeffectiveness, necessary functionality, and its potential with respect to services we created a testbed by adding wireless extensions to a public Gigabit IPnetwork, which was further...
Virtual Home Environment is a new concept that emerged in the context of the 3rd generation networks for mobile communications. The objective of this paper is to present the work that currently takes place in VESPER1, an IST project in the area of the VHE. The paper presents the VESPER project approach to the VHE architecture, its main components, the way they interact and the way this architecture...
Wireless Local Loop (WLL) such as LMDS typically has timevarying and high Bit Error Rate (BER) channel characteristics [1-3]. To provide Internet service over a such link, error protection mechanisms at link layer are necessary [4-6]. However, since different services provided by higher layers require different link layer behavior, a multi-service link layer architecture is needed, as has been proposed...
We study the problem of QoS guarantee for differentiated services. A two-level hierarchical scheduling framework is deployed for the separation of the QoS metrics. Due to the desirable property of minimizing the maximum packet lateness, the Earliest Deadline First (EDF) scheduling is adopted to provide the in-class scheduling for the time-sensitive traffic. We propose to employ an EDF scheduler combined...
As the Internet evolves into a global commercial infrastructure, there is a growing need to support more enhanced services than the traditional best-effort service. This paper describes an architecture of provisioning guaranteed Internet services. Unlike conventional QoS mechanisms such as Intserv and Diffserv, this architecture enables Internet resource management through market forces, e.g., pricing...
For data delivery systems such as video-on-demand service, an optimum design is presented to maximize the revenue of the system with priority classes. The willingness-to-pay (WTP) is introduced for a measure of utility (price), and the optimum design is discussed to maximize the revenue. For the system with two priority classes, the optimum condition is given in terms of the traffic load, waiting...
The era of classical PBX-based call centers has passed. Those systems were proprietary and closed, i.e. with fixed functionality. Today, the Internet and multimedia applications are becoming more and more popular across the world, and there is a lot of effort in both academia and industry to build and deploy modern Internet-based call centers. This paper should be viewed as a contribution to these...
Decoupled-CBQ, a CBQ derived scheduler, has been proved being a substantial improvement over CBQ. D-CBQ main advantages are a new set of rules for distributing excess bandwidth and the ability to guarantee bandwidth and delay in a separate way, whence the name “decoupled”. This paper aims at the characterization of D-CBQ by means of an extended set of simulations and a real implementation into the...
This paper compares the simulated performance of RED routers and ECN routers. The results show that ECN provides better goodput and fairness than RED for heterogeneous TCP flows. When demand is held constant, increasing the number offlo ws generating the demand has a negative effect on performance. ns-2 simulations with many flows demonstrate that the bottleneck router’s marking probability must be...
We present a diffusion model of a network node controlled by RED mechanism used to indicate congestion but not to delete packets. Diffusion approximation allows us to study the dynamics of flow changes introduced by this mechanism in a more efficient way than simulation. After introducing some basic notions on diffusion approximation and on our approach to solve diffusion equations analytically or...
We present a simple and scalable admission control algorithm for improving the Quality of Service (QoS) in Internet Service Provider (ISP) networks. The algorithm is novel in that it does not make any assumptions regarding the underlying transport technology (works at the IP layer), requires simple data structures and is low in operational complexity, can handle IP network topology changes efficiently,...
Core routers cannot provide the generalized and flexible computing power for supporting the substantial amount of processing needed for services on the Internet, where configuration and processing is needed per user for a large number of users. In this paper we propose an architecture for a highly scalable broadband IP services switch which supports per user services for a large number of users, provides...
We address the problem of maintaining logical time in a distributed system operating over a special type of a network: one whose underlying graph is represented by fully-connected mesh of star-topology subgraphs. Such a graph is generated, for example, by a wireless IP networkin which mobility service agents, interconnected by an IP backbone, provide wireless connectivity to mobile hosts currently...
The convergence of the mobile communications and Internet technologies has become a major driving force in the next generation telecommunications world. In order to realise the dream of global personal communications and allow the users to access information anywhere, at any time, the integration of terrestrial and satellite communications networks becomes necessary. Because the inter-segment handover...
In this paper, we study the effect of integrating voice and data services in wireless data networks. In particular, we evaluate the performance on cdma2000 system which is currently one of the strongest contenders for wireless data networking technology. Since the true nature of the wireless data is still not known, we use a mix of Poisson-distributed voice packets and Pareto-distributed data packets...
This paper proposes a hard handover control scheme that supports Internet Protocol (IP) host mobility by means of IP address translation servers that translate an IP address into another, and a handover server that registers locations of IP mobile hosts and remotely controls the servers. A functional comparison of the proposed scheme and conventional ones such as Mobile IPv4, Mobile IPv6, and Cellular...
Due to the rapid progress of information technology, computer systems with the client/server architecture have been becoming a new way in multi-user computing environments. For the environment of single server, the issue of remote login authentication has already been solved by a variety of schemes, but it has not been efficiently solved for multi-server Internet environments yet. In this paper, we...
Routing in the Internet is based on the best-effort mechanism, wherein a router forwards a packet to minimize the number of hops to the destination. Also in the Internet, all packets are treated the same independent of their size. We propose the framework of NetLets to enable the applications to send data packets to the destination with certain guarantees on the end-to-end delay. NetLets employ built-in...
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