共查询到20条相似文献,搜索用时 156 毫秒
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文章提出了一种基于业务等级协议(SLA)的动态带宽分配算法,该算法根据SLA为光网络单元(ONU)分配带宽权重和相应的优先权,确保了ONU的带宽分配和服务质量,改善了网络的性能,满足了网络业务的QoS要求.最后,通过仿真证明了这种算法的正确性. 相似文献
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研究和设计云计算环境下一种优化的基于QoS约束的调配算法,并验证其正确性。在QoS需求下采用具有服务等级协议(SLA)参数的约束条件,对任务划分优先级,形成优先级队列。SLA服务参数采用二进制权值的方法进行标记,避免了作业分级重叠的情况。在对该任务分配计算资源时,采用资源等级队列的方法,分配合理的工作节点。通过对几种算法的比较实验,验证优化算法运转的鲁棒性和正确性。 相似文献
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云计算服务等级协议(SLA)研究 总被引:2,自引:0,他引:2
以云计算服务等级协议SLA为研究对象,从云计算SLA的概念、需求以及云计算SLA所涉及到的参数等几个方面,对云计算服务等级协议SLA进行了研究和阐述。重点对目前常见的几种云计算服务所涉及的关键服务质量参数进行了分类阐述。 相似文献
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SLA(服务等级协议)将服务规范化、可度量化,是运营商给用户的服务承诺。对云来说,SLA尤为重要,它关系到用户对运营商的信任度。文章着重描述云数据中心服务中SLA体系的建立方法,包括如何设计和度量SLA指标,如何实施并优化LSLA体系等,希望SLA体系建立完成后能帮助云服务进一步走向成熟。 相似文献
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针对SLA(服务等级协议)在5G 2B(商业对商业)中面临的挑战,从技术、工程、商务维度开展分析,提出通过对2B需求进行原子化归类,并与网络特性、建设方案、维护手段进行一一匹配,形成映射数据库的应对方法。从而实现对网络建设和维护成本能力的快速测算,形成满足SLA条件下的商业报价,为促成5G 2B领域的商业合作提供有效保障。同时,简要介绍利用数字化软件工具促进SLA在5G 2B项目中广泛使用的方法。 相似文献
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自从中国加入WTO以来,国内电信市场全球化步伐日益加快,电信行业的竞争也逐步从简单的价格战转向提高服务品质和客户满意度。因此。如何规范服务品质、提高服务质量,已经成为国内电信企业面临的最新挑战。正是在新的市场竞争趋势和市场需求的双重压力下,SLA(服务等级协议)模式引起了广泛关注。介绍了电信领域SLA产生的背景和SLA管理的概念、内容,探讨了IP网络的SLA基本参数,并结合实际情况,探讨了电信运营商IP网络SLA实施中存在的困难。 相似文献
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效用max—min公平准则及其在ABR业务中的应用 总被引:2,自引:1,他引:1
本文提出一种新的基于效用函数的max-min(UMM)公平准则,它实现的是用户效用之间的公平分配。在ABR业务下,本文提出UMM公平性的另外两个等价定义,考察了用户的最小需求和最大需求。为了求解UMM公平分配,文中给出集中式的UMM公平分配算法及其数学证明。文章从保证分配效率的角度出发赋予峰值信元位率PCR以新的含义。UMM公平性不仅是对以往ABR业务中max-min公平性的概括,还具有很好的推广前景,特别适用于多应用类型的网络资源分配。 相似文献
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Adaptive Fair Subcarrier/Rate Allocation in Multirate OFDMA Networks: Radio Link Level Queuing Performance Analysis 总被引:2,自引:0,他引:2
This paper presents a semi-analytical methodology for radio link level performance analysis in a multirate "orthogonal frequency-division multiple-access" (OFDMA) network with adaptive fair rate allocation. Multirate transmission is assumed to be achieved through adaptive modulation, and fair rate allocation is based on the principle of generalized processor sharing to allocate the subcarriers adaptively among the users. The fair rate allocation problem is formulated as an optimization problem with the objective of maximizing system throughput while maintaining fairness (in terms of transmission rate) among the users. The "optimal" fair rate allocation is obtained by using the "Hungarian method." A heuristic-based approach, namely the "iterative approach," that is more implementation friendly is also presented. The throughput performance of the iterative fair rate allocation is observed to be as good as that of optimal fair rate allocation and is better than that of the static subcarrier allocation scheme. Also, the iterative fair allocation provides better fairness compared to that for each of the optimal and the static subcarrier allocation schemes. To this end, a queuing model is formulated to analyze radio link level performance measures such as packet dropping probability and packet transmission delay under the above rate allocation schemes. In this formulation, packet arrivals are modeled by the discrete Markov modulated Poisson process, which is flexible to model different types of traffic arrival patterns. The proposed framework for radio link level performance analysis of multirate OFDMA networks is validated by extensive simulations. Also, examples on the application of the proposed model for connection admission control and quality-of-service provisioning are illustrated 相似文献
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This paper is concerned with flow control and resource allocation problems in computer networks in which real-time applications may have hard quality of service (QoS) requirements. Recent optimal flow control approaches are unable to deal with these problems since QoS utility functions generally do not satisfy the strict concavity condition in real-time applications. For elastic traffic, we show that bandwidth allocations using the existing optimal flow control strategy can be quite unfair. If we consider different QoS requirements among network users, it may be undesirable to allocate bandwidth simply according to the traditional max-min fairness or proportional fairness. Instead, a network should have the ability to allocate bandwidth resources to various users, addressing their real utility requirements. For these reasons, this paper proposes a new distributed flow control algorithm for multiservice networks, where the application's utility is only assumed to be continuously increasing over the available bandwidth. In this, we show that the algorithm converges, and that at convergence, the utility achieved by each application is well balanced in a proportionally (or max-min) fair manner 相似文献
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Rui Yin Yu Zhang Guanding Yu Zhaoyang Zhang Jietao Zhang 《Wireless Personal Communications》2012,62(4):831-858
In this paper, we derive optimal joint power allocation, subchannel pairing and scheduling strategies in multiple orthogonal
channels multiple users wireless networks in the presence of a single regenerative relay node. Two models with users’ data
rate request (fairness) constraint in different time domains are considered. The first one is called deterministic model in
which each user’s data rate request has to be satisfied in each time slot t (named short term fairness constraint) and the second one is called stochastic model in which users have average data rate
request (named long term fairness). In these two models the optimization problems of maximizing system capacity with total
transmit power constraint and fairness constraint are formulated. The Lagrangian dual method is used to derive the optimal
solution for deterministic model and in the stochastic model stochastic approximation and dual method are employed to find
out the optimal algorithm. Both algorithms have polynomial times complexity, which is reduced significantly compared with
the Exhaustive Search Method (ESM). Since Lagrangian dual method is utilized in both schemes, the dual gap is also analyzed.
Furthermore, through the analysis and simulation, we see that the optimal resource allocation algorithm in stochastic model
has better performance than that in the deterministic model for its ability to exploit temporal diversity. 相似文献
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The traffic load of wireless LANs is often unevenly distributed among the access points (APs), which results in unfair bandwidth allocation among users. We argue that the load imbalance and consequent unfair bandwidth allocation can be greatly reduced by intelligent association control. In this paper, we present an efficient solution to determine the user-AP associations for max-min fair bandwidth allocation. We show the strong correlation between fairness and load balancing, which enables us to use load balancing techniques for obtaining optimal max-min fair bandwidth allocation. As this problem is NP-hard, we devise algorithms that achieve constant-factor approximation. In our algorithms, we first compute a fractional association solution, in which users can be associated with multiple APs simultaneously. This solution guarantees the fairest bandwidth allocation in terms of max-min fairness. Then, by utilizing a rounding method, we obtain the integral solution from the fractional solution. We also consider time fairness and present a polynomial-time algorithm for optimal integral solution. We further extend our schemes for the on-line case where users may join and leave dynamically. Our simulations demonstrate that the proposed algorithms achieve close to optimal load balancing (i.e., max-min fairness) and they outperform commonly used heuristics. 相似文献
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This paper proposes a new multiuser scheduling algorithm that can simultaneously support a variety of different quality‐of‐service (QoS) user groups while satisfying fairness among users in the same QoS group in MIMO broadcast channels. Toward this goal, the proposed algorithm consists of two parts: a QoS‐aware fair (QF) scheduling within a QoS group and an antenna trade‐off scheme between different QoS groups. The proposed QF scheduling algorithm finds a user set from a certain QoS group which can satisfy the fairness among users in terms of throughput or delay. The antenna trade‐off scheme can minimize the QoS violations of a higher priority user group by trading off the number of transmit antennas allocated to different QoS groups. Numerical results demonstrate that the proposed QF scheduling method satisfies different types of fairness among users and can adjust the degree of fairness among them. The antenna trade‐off scheme combined with QF scheduling can improve the probability of QoS‐guaranteed transmission when supporting different QoS groups. 相似文献
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Opportunistic interference alignment (OIA) algorithm was proposed for the practical implementation of interference alignment (IA).A fair and efficient OIA algorithm was presented for the unfairness in resource allocation and high dependence of tremendous users in the existing OIA algorithms.Firstly,the users with the best channel was selected in the primary cell based on round-robin scheduling after the coordinate cluster was determined.Then,the interference from the primary users was eliminated by skillfully designing the useful signal spaces in the subordinate cells.Furthermore,the users with the minimum interference leakage was selected in the subordinate cells.Finally,the fairness performance was theoretically analyzed.Simulation results show that both the sum-rate and fairness of the proposed algorithm are significantly higher than that of the conventional algorithm with less interference leakage.Besides,the users can achieve a quick access. 相似文献