共查询到18条相似文献,搜索用时 78 毫秒
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在ATM网络(异步传输模式)中,ABR(可用比特速率)业务主要面向数据通信服务,ABR带宽利用率的高你七所采用的带宽分配算法有密切的关系。文中介绍了ABR业务中带宽分配的一般性原则,并讨论了一种新的事宽分配算法。 相似文献
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IP网络链路带宽的测量 总被引:3,自引:0,他引:3
对网络带宽的测量是非常困难的,目前还没有一种很好的方法能对网络链路带宽进行精确的测量。本文详细讨论了现在流行的pathchar带宽测量算法,并针对其不足提出了一种改进的测量算法--E-pathchar。最后我们通过试验仿真对两种算法进行了对比,证明E-pathchar算法比pathchar算法的测量精度更高,测量速度更快,耗费网络资源更少。 相似文献
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ATM网络中,虚通道路由选择和带宽分配问题是相互关联的,需要考虑虚通道路由布局和带宽大小,并且虚通道连接还是建立虚信道连接的基础,文章根据虚通道连接的特点,提出了将虚通道路由选择和带宽分配联合优化的方法,给出了应用进化规划方法的求解算法和仿真实例。 相似文献
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提出一种在网络通信带宽分配领域,结合自动控制理论,利用基于优先级的串行主导因子法对链路带宽进行动态分配的方案。该算法通过引入主导因子和容忍因子,可以实现在具有流量工程基础的网络中对共享带宽进行实时动态分配。 相似文献
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在未来几年里,光网络已经为主宰接入网领域做好了准备。首先简单介绍了以太网无源光网络以及目前已经提出的不同的动态带宽分配算法,然后针对每个算法不同的特点与适用范围进行了性能分析和比较,最后对动态带宽算法未来的发展进行了展望。 相似文献
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数据通信具有突发性与带宽计算的不确定性,现有同步无线Mesh网络带宽申请与分配策略未对此问题进行充分考虑,在设计上存在带宽申请速度慢、带宽分配没有最大化、将数据时隙区分了上下行等不足,导致了QoS保障能力低与网络性能的下降。提出了带宽申请与分配策略的改进方案,包括结合各类数据业务类型的带宽申请条件的描述、检查数据发送队列的时间间隔描述、带宽分配最大化的描述、数据时隙不再区分上、下行的描述。理论分析表明,改进后的方案能够提供精确的QoS保障并提高网络性能。 相似文献
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根据虚信元丢失率和等效带宽分配的概念,提出了一种用于ATM风格中的呼叫允许接入控制的虚拟等效带宽分配算法。该方法明显提高了链路带宽的利用率,同时在业务种类较多,呼叫数量较大的情况下,比理论计算方法在计算复杂度上有很大的改善,因而便于实时控制。 相似文献
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Bandwidth-guaranteed QoS service in ad hoc networks is a challenging task due to several factors such as the absence of the central control, the dynamic network topology, the hidden terminal problem and the multihop routing property. An end-to-end bandwidth allocation algorithm was proposed in [Lin and Liu, 15] to support the QoS service in ad hoc networks. However, without exploring the global resource information along the route, the performance of that algorithm is quite limited. In addition, it also incurs significant control overhead. We develop a new algorithm for end-to-end bandwidth calculation and assignment in ad hoc networks which utilizes the global resource information along the route to determine the available end-to-end bandwidth. Our method also employs the topology-transparent scheduling technology to reduce the control overhead. The proposed algorithm can be efficiently utilized in a distributed manner. Both theoretical analysis and simulation results show that our end-to-end bandwidth allocation scheme can significantly improve the network capacity compared with the existing method. 相似文献
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用两个节点各复用几个图像终端的ATM网为例,研究五种图像源的带宽分配算法,静态时隙分配算法,缓冲区基础动态时隙分配算法,自适应时隙分配算法,先来先服务时隙分配算法和速度基础动态时隙分配算法,用计算机仿真和比较确定了五种算法的平均信元时延及时延偏差系数。 相似文献
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As broadband access is evolving from digital subscriber lines to optical access networks, Ethernet passive optical networks (EPONs) are considered a promising solution for next generation broadband access. The point‐to‐multipoint topology of EPONs requires a time‐division multiple access MAC protocol for upstream transmission. In this paper, we propose a new enhanced dynamic bandwidth allocation algorithm with fairness called EFDBA for multiple services over EPONs. The proposed algorithm is composed of a fairness counter controller and a fairness system buffer in the optical line terminal. The EFDBA algorithm with fairness can provide increased capability and efficient resource allocation in an EPON system. In the proposed EFDBA algorithm, the optical line termination allocates bandwidth to the optical network units in proportion to the fairness weighting counter number associated with their class and queue length. The proposed algorithm provides efficient resource utilization by reducing the unused remaining bandwidth made by idle state optical network units. 相似文献
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Wireless bandwidth is a scarce resource in a cellular mobile network. As such, it is important to effectively allocate bandwidth to each cell such that the overall system performance is optimized. Channel allocation strategies have been extensively studied for voice communications in cellular networks. However, for data dissemination applications, studies on bandwidth allocation have thus far been limited to a single-cell environment. This paper investigates the problem of bandwidth allocation for data dissemination in a multi-cell environment, which, to the best of our knowledge, has not been investigated before. The performance objective is to minimize the overall expected access latency given the workload for each cell in a data dissemination system. Two heuristic techniques, called compact allocation and cluster-step allocation, are proposed to effectively allocate bandwidth for a cellular network. Simulation experiments are conducted to evaluate the performance of the proposed bandwidth allocation schemes. Experimental results show that the proposed schemes substantially outperform the uniform allocation and proportional allocation schemes. 相似文献