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This paper discusses the development of a discrete-event simulation model for an integrated emergency post. This post is a collaboration between a general practitioners post and an emergency department within a hospital. We present a generalized and flexible simulation model, which can easily be adapted to several emergency departments as well as to other departments within the hospital, as we demonstrate...
As real-time multi-player games are increasingly popular network applications nowadays and 802.11 wireless are widely used, it is common that games are played over 802.11 networks. However, game performance can be degraded when competing with background traffic. In this paper, we propose Application Divided Resource Allocation (ADRA) scheme based on 802.11e to support games in a mixed traffic 802...
Processor cores in a chip multiprocessor (CMP) typically share a large last-level cache and the off-chip memory bandwidth. Previous studies demonstrate that explicit cache capacity and off-chip bandwidth partitioning can yield better overall system performance than without partitioning. However, little work has been done to study the interaction between cache capacity partitioning and off-chip bandwidth...
Autonomous management of a multi-tier Internet service involves two critical and challenging tasks, one understanding its dynamic behavior when subjected to dynamic workload and second adaptive management of its resources to achieve performance guarantees. In this paper, we propose a statistical machine learning based approach to achieve session slowdown guarantees of a multi-tier Internet service...
Quality communication over the wireless channel is now promised because of the advent of the broadband wireless. High speed data access is expected to be provided to subscribers through broadband wireless access. We propose a joint Call Admission Control (CAC) and Bandwidth Allocation (BA) for an IEEE 802.16 based WiMAX system. The presented schemes aim to provide QoS support along with a fair resource...
Strict Priority Queueing (SPQ) andWeighted Round Robin (WRR) are two common scheduling techniques to achieve Quality-of-Service (QoS) while using shared resources. Based on network calculus, we build analytical models for traffic flows under SPQ and WRR scheduling in on-chip wormhole networks. With these models, we can derive per-flow end-to-end delay bound. We compare the service behavior and show...
In the signaling plane of an IMS (IP Multimedia Subsystem) network, the interrogating Call/Session Control Function (I-CSCF) is required to choose the serving CSCF (S-CSCF) for user requests arriving at the proxy CSCFs (P-CSCF). This requires S-CSCF selection in such a way that the response time is minimized. However, in an overloaded situation, the P-CSCF entry points for arriving requests must balance...
Network virtualization has been propounded as a key attribute of the future internetworking paradigm and is expected to play a crucial role in the next generation Internet. In network virtualization environments, service providers utilize the networking resources provided by multiple network infrastructures to offer end-to-end services. Therefore, resource allocation for end-to-end Quality of Service...
Network virtualization has been proposed as a diversifying attribute of the future inter-networking paradigm. By allowing multiple heterogeneous network architectures to cohabit on a shared physical substrate, network virtualization provides flexibility, promotes diversity, and promises increased manageability. One of the most fundamental issues in network virtualization is to support multiple virtual...
In this paper we consider supporting real-time traffic in a cognitive radio sensor network (CRSN). A lot of traffic in wireless sensor networks (WSNs) requires strict quality of service (QoS) requirements, while most existing WSNs working in the license-free spectrum cannot provide guaranteed QoS. A cognitive radio network (CRN) can possibly support traffic with strict QoS requirements while avoiding...
Ultra-wideband (UWB) is a new wireless technology that transfers data over shorter distances with higher data rates and lower transmission power. WiMedia Alliance's Media Access Control (MAC) protocols for UWB-based wireless personal area networks have become an international standard. The Distributed Reservation Protocol (DRP) is part of this standard that reserves the wireless channel on a slot-by-slot...
Owing to the extensive use of commercial wide-band SATCOM systems by the Department Of Navy (DON) and the Department of Defense (DOD) in general, designers and operators of such systems need to investigate and analyze the performance of a broad range of deployment options with respect to communications requirements under a given warfighting scenario, and show the effects of these alternatives on these...
Cognitive wireless networks benefit from context awareness which is integrated in decision making process in different layers. In this paper, we modify the MAC layer transmission permission probability, for elastic traffic users, in such a way to discourage the transmissions from/to the users at the border of the cell where transmissions cause significant interference in adjacent cell. This will be...
Time-critical applications for wireless sensor networks (WSNs) are an important class of services supported by the standard IEEE 802.15.4. Control, actuation, and monitoring are all examples of applications where information must be delivered within some deadline. Understanding the delay in the packet delivery is fundamental to assess performance limitation for the standard. In this paper we analyze...
QoS control and resource management in 802.11e WLANs to support real time and multimedia services remains an open problem. All the solutions that only aim to enhance the performance of the enhanced distributed channel access (EDCA) mechanism cannot resolve the performance degradation problem once the channel becomes saturated. Hence, an efficient admission control scheme in EDCA is a key to guarantee...
The packet switching techniques are under evolution. The conventional "best effort" approach will no longer be the dominant service. The next generation of IP networks must provide the QoS to customers. Inadequacy is obvious when the conventional capacity allocation (CA) models are applied to the new IP architecture. In this paper, we propose a CA model that characterizes (1) the service...
This study addresses the issue of quantitative measure of fair resource allocation in multiservice networks considering to self-similarity properties in traffic.
In packet-switched network-on-chip, computing worst-case delay bounds is crucial for designing predictable and cost-effective communication systems but yet an intractable problem due to complicated resource sharing scenarios. For wormhole networks with credit-based flow control, the existence of cyclic dependency between flit delivery and credit generation further complicates the problem. Based on...
We describe an analytical model, based on a Markov chain, suitable to study different bandwidth allocation policies for video streams over a WiMax access link. The Markov chain models an MPEG source, wireless channel conditions derived from a model compliant with WiMax specifications, and different bandwidth allocation policies. Validation with simulation results shows the correctness of the analytical...
Low Earth orbit (LEO) satellite networks will work as an important component of the future telecommunications system. Multi-spot-beam antennas on satellites will allow a cellular coverage all over the Earth. However, the high speed of a mobile satellite may give rise to a large number of inter-beam and inter-satellite handovers during a call lifetime. In this paper, the author proposed a threshold-based...
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