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This paper present a comprehensive performance analysis of two low layer (picocell and femto cell) hierarchical cellular network using fluid flow mobility model. Mobile subscribers are divided into two classes: low and high mobile subscribers. Each of the originating and handoff calls of both slow and fast mobile subscribers initially ask for a channel in a femtocell.Picocell is overlaid over the...
Mobile Adhoc Network (MANET) is a collection of mobile nodes with dynamic topology. Such networks are of interest because they do not require any prior investment in fixed infrastructure. Instead, the network nodes agree to relay each other's packets and hence act as routers and automatically form their own cooperative infrastructure. The primary responsibility of a medium access control (MAC) protocol...
Typical wireless multimedia sensor networks are composed of many randomly deployed nodes which can retrieve information from the monitored field and relay packets following a hop-by-hop communication model. The transmission of packets from source nodes to the destination may flow across multiple paths, each one comprised of a number of intermediate nodes. The simple existence of a sensing unit in...
Increasing demands of ubiquitous services in wireless networks and evolution towards heterogeneous solutions has driven the necessity of developing efficient QoS aware vertical handoff (handoff between different networks) mechanisms. This paper proposes a QoS aware fuzzy rule based vertical handoff mechanism that makes a multi-criteria based decision, found to be effective for meeting the requirements...
A low-cost collaboration architecture for web content distribution, that aims to improve all stakeholder's interests, is presented. A peer-to-peer (P2P) contribution among the end users layer is suggested, in order to increase download rates and reduce server traffic and resource usage. In addition, the Internet Service Providers (ISPs) concerns are also considered, with an ISP-aware connection strategy...
The Internet is witnessing explosive growth in traffic, in large part due to bulk transfers. Delivering such traffic is expensive for ISPs because they pay other ISPs based on peak utilization. To limit costs, many ISPs are deploying ad-hoc traffic shaping policies that specifically target bulk flows. However, there is relatively little understanding today about the effectiveness of different shaping...
Optical Transport Network (OTN) is a standard approach to offering transport support to a variety of existing service technologies, e.g., ESCON, HDTV, GE, etc. Multiple service technologies can be concurrently multiplexed onto one common transport network, which offers hierarchical transmission rate wrappers physically supported by Wavelength Division Multiplexing (WDM) lambda channels. Algorithms...
Application layer centralized business players, such as search engines, have revolutionized the Internet, by smartly mediating between the users' generic interests and the specific resources returned. Meanwhile, networks consistently neglect the human nature of demand, and persist in handling a-priori offered load expressed in terms of requests for precisely identified network resources. A twofold...
Designing a heterogeneous network including systems providing different QoS, such as the emerging WiMAX, is a difficult task. The integration of a WiMAX access system with Differentiated Services (DiffServ) enhances the overall performance of the network. This paper investigates the interworking between WiMAX and DiffServ networks, by measuring one-way delay, jitter and packet drop rate of VoIP traffic...
This paper proposes a new scheduling algorithm for IEEE 802.16-2005 Broadband Wireless Metropolitan Area Networks in TDD mode. The proposed algorithm focuses on solving the problem of handling high priority traffic in congested networks while minimizing starvation conditions for other served classes. In this work, a detailed simulation study is carried out for the proposed scheduling algorithm as...
In traditional networks, a single malicious (“Byzantine”) packet switch can cause global disruption; for instance, by giving incorrect routing information, flooding the network with traffic, or forwarding data incorrectly. Previous work (which we'll call NPBR for “Network Protocols with Byzantine Robustness”) presented a network design resilient to Byzantine...
Stringent QoS maintenance in a wireless environment for VoIP communication is a major challenge. VoIP inherently generates constant bit rate traffic and is highly sensitive to network delay. However, unpredictable network congestion makes a VoIP session so degraded that its QoS goes below a tolerable limit. Accordingly, a suitable solution is needed to adapt varying network conditions satisfying minimum...
Internet Service Providers (ISPs) are in a constant race to meet the bandwidth demands of their subscribers. Access link upgrades, however, are expensive and take years to deploy. Many ISPs are looking for alternative solutions to reduce the need for continuous and expensive infrastructure expansion. This paper shows that there are many forms of local connectivity and storage in residential environments,...
In the paper the mathematical model of traffic management in the MPLS-TE DiffServ network is proposed. This model describes the processes of routing and distribution channel resource. In article the method of two-level traffic management in the MPLS-TE DiffServ network is offered to improve the scalability of the solutions on the basis of interactions prediction.
In this paper a flow-based model balancing queues at the nodes of MPLS-network is proposed. The novelty of the model is that it, in the contrast to the previously known models takes into account the features of the Traffic Engineering Queues technology. This technology has a purpose to ensuring load balancing of the node buffer resource.
In a wireless domain where a mobile user accesses heterogeneous wireless technologies with multiple interfaces, a multi-path scheduling algorithm can benefit mobile users' experience by aggregating different network bandwidth together. However, existing literature actually shows that for TCP flows, it may not be the case. To better exploit multi-path scheduling for TCP connections, this paper presents...
This work presents a study of RTP multiplexing schemes, which are compared with the normal use of RTP, in terms of ITU R-factor quality estimator. The bandwidth saving of the different schemes is studied, and some tests with VoIP traffic are carried out in order to compare R-factor using three different router buffer policies. Network delays are added using an adequate statistical distribution. The...
The considerable concern about the high constructing and maintaining costs is the bottleneck of rapid and world-wide fiber-to-the-home (FTTH) deployment. However, it is also important to maintain high communicative performance of FTTH networks as suppressing the constructing and maintaining costs. In order to reduce the constructing and maintaining costs of FTTH networks, this paper proposed a bus...
Prioritization of flows in a home network based on traffic classification is still no guarantee that enough bandwidth will be available between a server and a client. Besides, such QoS technologies need to be supported by every device in the end-to-end path to be effective, which is relatively expensive for the owners of home networks. In any small-scale IP network (best-effort or QoS-enabled) it...
We investigate link-state advertising in multi-domain networks with dynamic traffic. A novel triggering scheme is proposed to monitor a subset of domain links, and thereby achieve a balance between salability and accuracy.
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