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In this paper, we present the methodologies used in existing literature for Virtual Machine (VM) placement, load balancing and server consolidation in a data center environment. While the methodologies may seem fine on the surface, certain drawbacks and anomalies can be uncovered when they are analyzed deeper. We point out those anomalies and draw backs in(More)
IEEE 802.11 based wireless LANs (WLAN) are ubiquitous nowadays. Running real time voice and video applications over LANs is becoming common place. These applications require QoS in terms of delay, throughput etc. But 802.11 does not have inherent QoS support. Since 802.11 has a large installation base providing QoS in 802.11 WLANs is an important issue. In(More)
Scheduling and call admission control (CAC) in IEEE 802.16 system play a vital role in the performance of the system. The 802.16 standard does not specify any scheduling architecture or CAC. Many proposals assume a bandwidth based CAC which only provides bandwidth guarantee, but cannot fulfill delay and jitter requirements. In this paper, we propose a CAC(More)
In this paper, we report our work on adaptive connection admission control in real-time communication networks. Much of the existing work on connection admission control (CAC) specifies the QoS parameters as fixed values and does not exploit the dynamic fluctuations in resource availability. We take an innovative approach: First, we allow an application to(More)
This paper presents an integrated MAC and routing protocol called Delay Guaranteed Routing and MAC (DGRAM) for delay-sensitive wireless sensor network (WSN) applications. DGRAM is a TDMA-based protocol designed to provide deterministic delay guarantee in an energy-efficient manner. The design is based on slot reuse to reduce latency of a node in accessing(More)
—We propose a model-based channel access mechanism for cognitive radio-enabled secondary network, which op-portunistically uses the channel of an unslotted primary network when the channel is sensed idle. We refer to primary network as the network which carry the main traffic in a designated spectrum band. We have considered IEEE 802.11 WLAN as a de facto(More)
—In a wireless sensor network (WSN), interesting events are reported to the sink by the sensors in a distributed manner. Applications running at the sink require certain reliability in terms of events per unit time to be able to run satisfactorily. Individual report from sensor nodes is not important, but collective reports from sensor nodes of a region of(More)
Assuming that Secondary Users (SU) have channel occupancy data (channel idle and busy durations) of Primary Users (PU), this paper presents a methodology to fit primary channel occupancy data to a distribution. Then we show how SUs can opportunistically transmit in the white spaces based on residual white space distribution while keeping probability of(More)
The goal of this project is to provide a low cost open source Remote Desktop based computing environment to users by using Virtualization Technology and existing open source software and tools. In this project, we have used LTSP (Linux Terminal Server Project) [1] to access Remote Desktop and Xen [2] hypervisor to provide virtual desktop environment at(More)