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鉴于IEEE802.16标准中未对接纳控制机制提出定义,为了提高系统带宽利用率,在分析现有无线网络接纳控制技术的基础上,结合IEEE802.16的具体机制提出了一种基于业务优先级的接纳控制算法。相比于先到先服务的接纳机制,该算法严格区分业务优先级,为不同优先级业务预留带宽,以保证实时业务的服务质量(QoS)要求。利用NS2网络模拟软件对算法进行了仿真和性能评估。结果表明,本接纳控制算法可以较好地保障高优先级业务的实时性,同时在重负载情况下系统带宽利用率有了明显提高。 相似文献
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为解决融合多媒体应用的互联网的QoS问题,该文提出了一种适用于高速分组网络的低复杂度的分组调度通用架构(PSS, Priority-based Scheduling Structure)。PSS将整个调度分为高、低两个优先级调度过程,在高优先级调度过程,提出了一种带约束条件和速率控制因子的排序优先型算法,避免了带宽抢占现象,有效控制了高优先级业务的服务速率;在低优先级过程,提出了一种改进的帧结构型算法,不仅降低了算法复杂度,减小了硬件实现成本,而且缓解了输出业务流的突发性。最后从数学分析和仿真实验两方面证实了PSS架构的可行性和实效性。 相似文献
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给出了基于缓冲器门限的多优先级双队列图像/话音/数据综合业务复用模型,并采用流体流法进行了详细的分析,给出了模型主要参数的解法,最后本文还介绍了控制各优先级业务信元丢失概率的方法。实验表明,该模型方法的理论计算与计算机模拟结果基本吻合,有一定的工程应用价值。 相似文献
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In this paper, we show how online management of both quality of service (QoS) and provider revenue can be performed in CDMA cellular networks by adaptive control of system parameters to changing traffic conditions. The key contribution is the introduction of a novel call admission control and bandwidth degradation scheme for real-time traffic as well as the development of a Markov model for the admission controller. This Markov model incorporates important features of 3G cellular networks, such as CDMA intra- and inter-cell interference, different call priorities and soft handover. From the results of the Markov model the threshold for maximal call degradation is periodically adjusted according to the currently measured traffic in the radio access network. As a consequence, QoS and revenue measures can be optimized with respect to a predefined goal. To illustrate the effectiveness of the proposed QoS/revenue management approach, we present quantitative results for the Markov model and a comprehensive simulation study considering a half-day window of a daily usage pattern. 相似文献
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Traffic shaping and smoothing using buffers or leaky buckets does not necessarily improve Quality of Service (QoS). In fact there is a trade-off between controlling user traffic and guaranteeing QoS to the users. We consider the first two stages (source node and border node before entering a network cloud) of an end-to-end QoS problem and assume that the QoS requirements across each of the two stages are given. We formulate and solve a mathematical programming problem to select optimal leaky bucket parameters that would enable high-speed telecommunication network providers to optimize traffic policing subject to guaranteeing a negotiated Quality of Service requirement across the first stage namely the source end. We address both the buffered and unbuffered leaky bucket cases where using fluid models we characterize the output process from the leaky buckets for general traffic sources. Using the optimal leaky bucket parameters and output characteristics (effective bandwidths in particular), we solve design and connection admission control problems given QoS requirements at the second stage, namely the border node. 相似文献
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In wireless multimedia communication systems, call admission control (CAC) is critical for simultaneously achieving a high resource utilization efficiency and maintaining quality-of-service (QoS) to mobile users. User mobility, heterogeneous nature of multimedia traffic, and limited radio spectrum pose significant challenges to CAC. QoS provisioning to both new calls and handoff calls comes with a cost of low resource utilization. This paper proposes a CAC policy for a wireless communication system supporting integrated voice and dataservices. In particular, soft QoS (or relaxed target QoS) is incorporated in the CAC policy to make compromises among different objectives.Numerical results are presented to demonstrate that (a) in dealing with the dilemma between QoS satisfaction and high resource utilization, how the resource utilization efficiency can be increased by introducing soft QoS; and (b) in accommodating different types of traffic, how the QoS of low priority traffic can be improved by specifying soft QoS to high priority traffic. 相似文献
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介绍了一种新的接纳控制算法,能优先满足用户的服务质量,并减小网络的阻塞情况,使用户与网络的共同利益得到最优。仿真结果表明,该算法可保持各网络的负载均衡、减少掉话率,从而达到较好的用户满意度。 相似文献
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基于第三代(3G)移动通信系统的时分同步码分多址(TD-SCDMA)集群通信系统,可以承载不同类型的集群业务,并能够为用户提供服务质量(QoS)保证。在无线网中提供QoS保证,呼叫接纳控制(CAC)扮演着重要的角色。在学习总结常规移动通信系统CAC方面研究成果的基础上,结合集群通信的特点,给出了适用于TD-SCDMA集群通信系统的呼叫接纳控制流程。 相似文献
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Juliana Freitag Borin Nelson Luis Saldanha da Fonseca 《Wireless Communications and Mobile Computing》2014,14(14):1409-1419
This paper introduces admission control policies for WiMAX networks, which aim to reach three main goals: restrict the number of simultaneous connections in the system so that the resources available for the uplink scheduler are sufficient to guarantee the quality‐of‐service requirements for each connection, support the service provider expectations by maximizing the revenue, and maximize user satisfaction by granting additional resources. The optimal solution to meet these goals is non‐deterministic polynomial‐time hard and therefore cannot be solved in acceptable polynomial time. For this reason, both optimal and polynomial time heuristic solutions are introduced. Simulation experiments are used to evaluate and compare the proposed policies. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献