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We consider multi-hop wireless networks serving multiple flows in which only packets that meet hard end-to-end deadline constraints are useful, i.e., if a packet is not delivered to its destination node by its deadline, it is dropped from the network. We design decentralized scheduling policies for such multi-hop networks that attain the maximum throughput of useful packets. The resulting policy is...
Long Term Evolution-Advanced (LTE-Advanced) and other advanced technologies like IEEE802.16e and IEEE802.11g base their physical layer transmission on multiple input multiple output (MIMO). The concept of multiple antennas at both receiver and transmitter ends is attributed with advantages of spatial multiplexing and diversity, however, the Implementation on small size UEs has its own limitations...
The smartphone revolution and widespread availability of wireless LAN and mobile Internet technologies has changed the way people interact with the world. These technologies can be exploited by event organisers to boost audience involvement and immersion, for example, by integrating user-generated content into the event experience. In this paper, we developed a large-scale event participation platform...
Steady growth in storage and processing capabilities has led to the accumulation of large-scale datasets that contain valuable insight into the interactions of complex systems, long-and short-term trends, and real-world phenomena. Converged infrastructure, operating on cloud deployments and private clusters, has emerged as an energy-efficient and cost-effective means of coping with these computing...
A fundamental premise in cloud computing is trying to provide a more sophisticated computing resource sharing capability. In order to provide better allocation, the Dominant Resource Fairness (DRF) approach has been developed to address the "fair resource allocation problem" at the application layer for multi-tenant cloud applications. Nevertheless conventional DRF only considers the interplay...
New scheduling algorithms are first evaluated using simulation. In these simulations, the workload has a huge influence on the measured performance of the simulated system. Therefore, it is customary to use workload traces recorded previously from real systems. Such open-system simulations preserve all the jobs' properties. However, preserving the jobs' arrival times actually destroys the logic of...
The aggregation technique was defined by IEEE 802.11n, and used later by IEEE 802.11ac. This technique combines numerous packets into a single transmission. Hence, the throughput is improved since the overhead associated with each transmission is reduced. However, the delay is increased in the case of low rate application and large size of aggregated frame. In this paper, we propose new scheduling...
In this paper, we present a new approach that seeks reducing the downlink TBS-index by the LTE-A eNodeB. Our objective is to minimize the total transmitted power based on getting the benefit from available but unused PRBs, while considering the QoS for the UEs and mitigating the interference from adjecent eNodeBs. Most previous studies have not assigned the residual PRBs in the eNodeB to change the...
Recently, it has been shown that hard real-time scheduling theory can be applied to streaming applications modeled as acyclic Cyclo-Static Dataflow (CSDF) graphs. However, that approach is not efficient in terms of throughput and processor utilization. Therefore, in this paper, we propose an improved hard real-time scheduling approach to schedule streaming applications modeled as acyclic CSDF graphs...
Wireless scheduling has been extensively studied in the literature. Since Maximum Weighted Scheduling has been developed and shown to achieve the optimal performance, there have been many efforts to overcome its complexity issue. In this paper, we develop a novel random access scheduling scheme that maintains constant collision rate. We employ the Additive Increase Multiplicative Decrease (AIMD) control...
In this paper, priority-aware scheduling to the coexistence of multiple wireless body area networks (WBANs) is addressed. The scheduling is formulated as a nonlinear optimization problem where the objective is to maximize system throughput while guaranteeing the priorities among WBANs. To overcome the inherent complexity issue, a new method, called recursive decomposition algorithm (RDA), is proposed...
In-band full-duplex (IBFD) operation can potentially double the spectral efficiency of wireless networks. For IBFD operation, self-interference is a critical issue. In addition, in full-duplex cellular (FDC) networks, particularly when the cell size is small, inter-user interference would be another limiting factor for the performance. To overcome these issues, the scheduling scheme proposed in this...
Bandwidth is a shared and limited resource of the wireless LAN. The MAC protocols are mainly responsible for efficiently sharing it among all the stations. The IEEE 802.11 standard uses Distributed Coordination Function (DCF) as its default MAC protocol which employs Carrier Sense Multiple Access using Collision Avoidance (CSMA/CA) scheme with binary exponential backoff algorithm. Despite its ubiquitous...
A load balancing algorithm which considers the different characteristics of the grid computing environment is needed as grid computing is emerging all over the internet. Therefore, this research presents a Novel fault tolerant job Scheduling and load balancing strategy named as NovelAlg_FLB, which focuses on grid architecture, computer heterogeneity, communication delay, network bandwidth, resource...
LTE uses single carrier-frequency division multiple access (SC-FDMA) scheme for the uplink transmission which limits the flexibility of the allocation process as the sub carriers assigned to a single user have to be contiguous. We propose an LTE uplink interference-aware search-tree based scheduling scheme using the high interference indicator (HII) and the overload indicator (OI) messages that are...
Scheduling algorithms published in the scientific literature are often difficult to evaluate or compare due to differences between the experimental evaluations in any two papers on the topic. Very few researchers share the details about the scheduling problem instances they use in their evaluation section, the code that allows them to transform the numbers they collect into the results and graphs...
Cloud Computing is a major area of research. Cost and Load balancing has become an important QoS parameter. Load Balancing directly affects the Reliability, Response Time, Throughput and Energy Efficiency of a Server. A good Load Balanced architecture implies minimized overall time, less server failure, minimized response time, increased throughput and less wastage of energy. Such architecture also...
In this paper we consider a wireless network composed of a base station and a number of clients, with the goal of scheduling real-time traffic. Even though this problem has been extensively studied in the literature, the impact of delayed acknowledgment has not been assessed. Delayed feedback is of increasing importance in systems where the round trip delay is much greater than the packet transmission...
DPS is a Cooperative Multi-Point (CoMP) transmission scheme, where the serving Transmission Point (TP) can be switched on a fast time-scale. In this paper, we refine and improve our previously proposed greedy Instantaneous Load based DPS scheme (IL-DPS) to work well under realistic bursty traffic conditions and load imbalanced scenarios. We introduce three additional, simple, multiplicative correction...
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