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Long Term Evolution (LTE) is a breakthrough in broadband technology which aims to support several high level quality and real time multimedia services for the mobile users. This paper proposes a resource block preserver (RBP) scheduling algorithm which optimizes the performance of the downlink transmission system in LTE network. The resource block preserver algorithm has two layers, upper and lower...
Traditional scheduling algorithms are focused in maximizing system throughput considering a grade of fairness. However, maximizing the system throughput does not necessarily result in maximizing the number of satisfied users (users with a packet delay below a threshold). Also, the throughput maximization could cause a low grade of fairness. In this paper, we propose a scheduling algorithm that maximizes...
LTE system performance largely depends on the high efficiency of frequency domain resource scheduling. This paper presents a single-cell LTE Downlink scheduling model, and then introduces the economic concept of utility function in order to design a LTE system scheduling algorithm based on the utility function (UBS) and we simulate the algorithm. We simulate and compare throughput, fairness, packet...
Modern wireless networks, such as WiMAX or LTE are using OFDM/OFDMA as the enabling technologies for broadband transmission in cellular environments with QoS capabilities. In these networks, such schema as radio resource management, admission control, scheduling are essential. In this article we firstly introduce a Time-Frequency Burst Mapping algorithm for radio resource management that improves...
Mobile WiMAX's scheduling service is a key factor in Radio Resource Management (RRM) in realizing Quality of Service (QoS). The choice in scheduling algorithm for Mobile WiMAX base stations, albeit outside of the scope of the standard, critically impacts the performance and robustness of Mobile WiMAX networks. This paper provides an in-depth study of four major scheduling algorithms: Round Robin (RR),...
The increasing demand on multi-media services with very different QoS requirements and the employment of new wireless network protocols like 802.11 and 802.16, underscore the need for a network capable of supporting multi-services. Based on the LWDF (Largest Weighted Delay First) algorithm, DS-LWDF (Differentiated Service-LWDF) algorithm is proposed to realize the scheduling among RT (Real Time) and...
Grid computing deals with computationally intensive distributed resources on heterogeneous environment, so grid scheduling is a fundamental challenge and is critical to performance and cost. Traditional grid scheduling algorithms most use deterministic models. But grid environments in the real world are subject to many sources of uncertainty or randomness, such as network status, job execution costs,...
The problem of solving fast collaboration among many related enterprises has been an important research issue in the Web Society research area. The recent proposed Cloud Computing application model called the Community Cloud Computing has provided a good solution for this problem. This paper proposed a novel workflow system framework for the Community Cloud which meets the need of the process-based...
This paper focuses on studying the impacts of a duty-cycle based CKN sleep scheduling algorithm for our previous designed TPGF geographical multipath routing algorithm in wireless sensor networks (WSNs). It reveals the fact that waking up more sensor nodes cannot always help to improve the exploration results of TPGF in a duty-cycle based WSN. Furthermore, this study provides the meaningful direction...
Nowadays, most of the computerized network applications are depending on the ability of the servicing packet switching network to integrate different types of traffic from two main categories, real-time and best-effort classes, and provide different QoS guarantees based on the traffic type. Different methods were applied to provide such guarantees, one of the most efficient method used in packet switching...
Orthogonal Frequency Division Multiple Access (OFDMA) is the multiple access technology that may be used in the next generation broadband wireless communication systems. We devise some new algorithms which use the linear combination of two variables as the objective matrix. In these algorithms, both cell throughput and user fairness are considered. To guarantee the user quality of service (QoS), we...
We study scheduling unit-length packets with soft deadlines. In our setting, packets arrive over time and a packet may have different values contributed to the objective when it is delivered at different time. In one time step, at most one packet is allowed to be sent. Our goal is to maximize the total value achieved by delivering packets. Based on various application requirements, we propose two...
The IEEE 802.16 standard defines MAC and Physical layers for broadband wireless networks called WiMAX, however, it does not define the scheduling algorithm for the uplink and downlink traffic. In this paper, a predictive scheduling algorithm for uplink traffic in IEEE 802.16 networks is proposed. The proposed algorithm uses the cross-layer approach and is applied on the queue of the bandwidth requests...
WMS (Workflow Management System) are gaining popularity in recent years. Most scheduling algorithms developed for WMS focus on a single QoS requirement or a single workflow. However, WMS should serve for many users. And different users have different QoS requirements, the scheduling algorithm should be developed for multiple workflows with different QoS requirements. The scheduler should satisfy every...
In order to provide the high quality service for transporting video streaming in the Bluetooth Piconet, in which the bandwidth is limited and the structure is heterogeneous, a MAC scheduling algorithm for video streaming in the Bluetooth Piconet is proposed. The main idea of the algorithm is to model the video streaming and calculate the importance of the packet relative to the video quality before...
Since the WiMAX mesh network can guarantee the QoS, it is possible to be deployed as backhaul network. And we need to consider the scheduling efficiency, throughput and robustness for it. In this paper, we analyze the scheduling mechanism of the WiMAX mesh network and point out the problem of current backhaul network structure. We proposed a new WiMAX mesh network structure with multiple BS as egress,...
In this paper, a novel multi-radio packet scheduling algorithm, QU, is proposed for real-time traffic on generic link layer (GLL). First, a scheduling-utility function is designed to represent the utility of scheduling a packet to a radio access with the goal to guarantee QoS and improve spectrum utilization. Second, using this utility function, a multi-radio packet scheduling model is presented based...
Task scheduling in dynamic, heterogeneous and distributed grid environments is a complex and challenging issue. On the basis of multi-objective genetic algorithm NSGA-II, the chromosome coding schema is proposed. Also, this paper presents the generating method for the initial population and the genetic operators such as selection, crossover and mutation. The experimental results show that the proposed...
Significant throughput gains and system fairness can be obtained by employing scheduling schemes based on precoding techniques. However, QoS guarantee requirements are seldom taken into account. In this paper, we propose a downlink scheduling algorithm for QoS-guaranteed services in multi-user multiple-input multiple-output (MIMO) systems with limited feedback. The proposed algorithm combines stream...
Although significant throughput gains and system fairness can be obtained by slot-based scheduling algorithms, the corresponding complexities are considerable. In this paper, we propose a region-based downlink scheduling algorithm for QoS-guaranteed services in multi-user multiple-input multiple-output (MIMO) precoding systems. In contrast with conventional slot- based scheduling, region-based scheduling...
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