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As Information and Communication Technology (ICT) is becoming more and more wide-spread and pervasive in our daily life, it is important to get a realistic overview of the worldwide impact of ICT on the environment in general and on energy and electricity needs in particular. This paper reports on a detailed study to estimate this impact today and to predict how this will evolve in the future. From...
With the advent of new upcoming online video services such as IPTV, video on demand (VoD) and peer-to-peer (P2P) video streaming, content providers are gaining more and more interest in measuring and monitoring video quality as perceived by end-users; also known as quality of experience (QoE). Objective video quality metrics provide a means of measuring visual quality degradations but in order to...
This paper presents graphical update caching as a mechanism to reduce the network load generated by thin client computing systems. In such system, the user interaction and processing are separated by a network. User input such as keystrokes and mouse clicks are sent to the server over the network and graphical updates are transported the reverse way. The cache proposed in this article is static, meaning...
In a thin client computing architecture, application processing is delegated to a remote server rather than running the application locally. User input is forwarded to the server, and the rendered images are relayed through a dedicated remote display protocol to the user's device. Existing remote display protocols have been successfully optimized for applications with only minor and low-frequent screen...
Internet-on-the-train is a rising concept in the last few years. Several trials in different countries have proved the feasibility of offering Internet access to train commuters, but none of them combines broadband access, scalability, seamless handover and quality of service guarantees in one solution. In this paper, we look at the features of SCTP and its extensions which could overcome these shortcomings...
Intelligent transport systems (ITS) are ICT systems that enable a more efficient and safer traffic through the use of a wide range of diverse technologies. In this paper we present a scalable ITS architecture by making use of the upcoming broadcast standards for mobile television, more specifically DVB-H (digital video broadcasting-handheld) and DVB-SH (satellite services to handhelds). Our integration...
Capital expenditures for a network operator have often and in high detail been considered in different studies. In contrast there are little or no studies in which a detailed (quantitative) study is made on operational expenditures (OpEx). Existing studies on operational expenditures for network operators propose classification and models for existing operational processes and are aimed at a cost...
We present an ILP model for dimensioning optical networks that support wavelength and sub-wavelength switching. Results indicate significant reductions in cost and node-complexity with such multi-granular networks.
Efforts of standardization bodies illustrate that Ethernet is conquering carrier environments. Resulting technologies intend to overcome Ethernet bridging limitations. Validated through emulation, we show the gain of segment protection in connection-oriented Ethernet.
WSXC optical networks are an interesting option for future optical transport networks. All competitive future optical transport networks will have some restoration mechanism implemented. In this paper, we study the effects of protection on the CAPEX of transparent and opaque networks.
This paper presents a PowerPoint presentation discussing how discrete event simulation can be used by telecom operators to reduce operational expenses.
To cope with ever-increasing traffic demands in transport networks, all-optical switching is currently perceived as a potential solution to remove bottlenecks caused by optoelectronic conversions. An effective realization of this concept must support a wide range of traffic patterns, while remaining feasible to construct and deploy both in an economical and practical sense. In this paper, we propose...
Nowadays, many telecom operators are reluctant to roll out a new fiber to the home (FTTH) infrastructure, as they are put off by the high investment costs. Inspired by several local FTTH initiatives, especially in Western Europe, this paper considers an FTTH rollout by a local community. We show that clearly different economics play a part in case a community would roll out the FTTH infrastructure,...
In this paper we present a cross layer topology preserving channel selection protocol for a two interface wireless mesh network. The presented protocol is a cluster driven channel selection protocol, preserving a single interface to maintain connectivity and using the other interface to participate in small clusters. The clusters are organized by an independent set clustering algorithm, in which the...
Energy is scarce in sensor nodes. Therefore wireless sensor networks aim to transmit as few packets as possible. An often used technique is to aggregate data coming from multiple sensor nodes into a single packet. In this paper, we broaden this approach so that control information can also be sent together with other (control) information. The benefits of this broadened aggregation approach are discussed,...
In contrast to traditional wireless sensor networks, where energy conservation is the main objective, next-generation wireless sensor networks will additionally demand guarantees in terms of delay, reliability and bandwidth. However, current sensor network protocols offer very limited QoS support. Moreover, the current research does not take into account the growing heterogeneous nature of sensor...
Body sensor networks are an interesting emerging application of wireless sensor networks to improve healthcare and the quality of life. Current research has mainly focused on single-hop networks, although some works clearly show advantages of multi-hop architectures. In this paper, we model probabilistic connectivity in such multi-hop body sensor networks. Instead of using a circular coverage area,...
On the one hand, agent-based software platforms are commonly used these days, while on the other hand Semantic Web technologies are also maturing. It is obvious that the combination of these two technologies can bring added value through the creation of Semantic Agent-based frameworks. However, it is also known that these Semantic Web technologies, and the reasoning on ontologies in particular, can...
Currently many service providers offer their services using a private and proprietary hard- and software infrastructure. These infrastructures often share many similarities. Hence we believe a generic service delivery architecture, that allows service providers to offer a large array of different services on a shared infrastructure, would provide many advantages over current silo-based approaches...
The introduction of FTTH leads to high costs, especially in fiber deployment. In operations we face a high complexity and corresponding high cost of fiber splicing compared to copper welding. However, fiber based access networks are less vulnerable to degradation because of outside plant conditions, leading to lower failure rates. In order to correctly calculate the business case for a new FTTH network...
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