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In order to manage Quality of Service (QoS) and energy efficiency in the optical access network, an online Dynamic Bandwidth Allocation (DBA) algorithm with adaptive sleep cycle is presented. This DBA algorithm has the ability to allocate an additional bandwidth to the end user within a single sleep cycle whose duration changes depending on the current buffers occupancy. The purpose of this DBA algorithm is to tune the duration of the sleep cycle depending on the network load in order to provide service to the end user without violating strict QoS requests in all network operating conditions. 相似文献
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A. G. Padalko A. N. Veselov S. P. Avduhin G. D. Nipan V. P. Sanygin 《Journal of Thermal Analysis and Calorimetry》2005,80(3):599-606
Summary The phase transformations in the three Ni-base alloys at the temperature range up to 1500°C and at the pressure of 170 MPa were studied. Solidus, -phase dissolution/precipitation, carbides dissolution/precipitation and liquidus temperatures are established. Multiple exceeding of the Ni-base alloys characteristic temperatures pressure coefficients over metal components ones (up to 10 times) is observed both at the heating and cooling scans during the experiments on the differential barothermal analysis. On the DBA curves had been obtained at 170 MPa, there are from two to three peaks, which connected with the carbides dissolution/precipitation, while on the each conventional DTA curve there was merely one carbide thermal effect. The liquidus temperature pressure coefficients correlate with the Ni melting point pressure coefficient. 相似文献
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EPON(Ethernet Passive Optical Network)由于它的低成本和高带宽,一直被人们认为是下一代接入网的解决方案.而动态带宽分配算法(DBA)一直是人们研究的热点.本论文回顾了最近几年已提出的DBA算法,并提出一种新的提高带宽利用率和降低延时的DBA算法.OLT依据接收到的REPORT帧判断ONU缓存队列的大小,如果队列小于最大传输窗口则先授权.在仿真中可以看到采取此算法可以降低延时并提高了带宽利用率. 相似文献
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为了实现吉比特无源光网络带宽分配的公平性,降低网络的传输延时,设计了一种新的媒质访问控制协议,提出了一种新的动态带宽分配算法.其基本思想是:在保证拥有不同QoS业务的用户得到认购速率的基础上,根据网络负载的大小,动态地将某些用户未使用的带宽分配给其他带宽需求大的用户,以提高网络的带宽利用率.仿真结果表明,这种新的算法在严格控制数据传输延时的前提下,能够保证多用户之间带宽分配的公平性. 相似文献
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随着高清IPTV、在线游戏等业务的发展,用户对于带宽的需求日益增加,10G-EPON技术应运而生。与传统的EPON系统一样,10G-EPON系统的动态带宽分配问题仍然十分关键。带宽分配方式的选择对于如何避免传输冲突,提高系统的带宽利用率且保障服务质量都非常重要。在已有算法的基础之上,提出一种改进型动态带宽分配算法。该算法重点确保高优先级业务的服务要求,在一定程度上体现了不同等级ONU之间的公平性,提高了上行带宽利用率。 相似文献
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GPON具有高速率、高效率和低成本的特点,是实现宽带接入网的最佳技术之一。本文主要介绍了GPON的参考配置、媒质访问控制、GEM封装和DBA,最后结合GPON的优势论述了GPON在目前网络中的应用模式。 相似文献