EPON和WiMAX融合架构下带宽分配和调度机制的研究

以太网无源光网络(EPON)和IEEE 802.16(WiMAX)的融合网络在固定移动混合接入网中被认为是很有前景的接入方式.文中提出了3种WiMAX无线网络与EPON网络系统融合架构,融合系统同时具有光网络的高带宽和无线网络的灵活性.为了在接入网中支持QoS,本文为融合结构提出了一种动态带宽分配算法(DBA)和调度机...     

EPON和WiMax融合架构下带宽分配算法的研究

EPON和WiAMX的融合架构提供了一种低成本、高带宽和高覆盖的接入网的解决方案.EPON和WiMAX有着不同的服务质量(QoS)体系模型,对于融合架构来说,如何建立统一的带宽分配策略,实现区分多业务和保证QoS是需要面对的一个问题.文章设计了一个融合网络下的带宽分配框架,详细分析了带宽申请和分配的过程,并给出了具体的算法设计.     

基于固网移动网融合(FMC)的宽带接入网系统

文章提出了3种WiMAX无线网络与EPON系统融合架构,融合系统同时具有光网络的高带宽和无线网络的灵活性.根据融合系统的具体架构,讨论了带宽分配,数据转发等系统控制和操作的优化处理.WiMAX与EPON的融合实现了固网移动网在接入网系统中的融合,为新一代宽带接入网技术提供了一个可行方案.     

一种EPON带宽分配算法的实用方案

EPON(Ethernet Passive Optical Networks)系统中有两个问题:一是EPON中最关键成分之一--动态带宽分配;二是EPON的上行(ONU到OLT)为多点到点的传输,不能与以太网标准设备兼容.结合这两个问题介绍一种优化的带宽分配方案,它由基于参数的访问权限控制(CAC)机制、平均分配算法(EDA)和带宽预留轮询算法(BGP)组成,并将算法信息加入EPON内部帧,根据网络用户的服务等级(SLA)分配带宽,为EPON与以太网标准设备兼容提供算法支持,优化EPON网络的性能.     

基于动态最大传输窗口的带宽分配算法研究

数据业务和话音业务是未来网络中两个重要业务.作为下一代宽带接入的有效解决方案,以太网无源光网络(EPON)为用户提供了业务接口.对EPON中的上行带宽分配算法进行了分析研究,并提出一种基于动态最大传输窗口 DMTW 的 EPON 上行带宽分配算法.在本算法中根据业务和用户的优先级动态调整最大的传输窗口,合理分配上行带宽的资源,提高信道利用率和QoS,降低了传输时延.最后通过软件进行仿真,验证了算法的有效性.     

EPON和WiMAX融合网管带宽管理模块设计实现

在EPON和WiMAX融合接入网中,为对网络带宽进行管理,需要结合WiMAX业务在EPON网络中的映射情况,对各级带宽进行配置.针对这一需求,设计实现了能够自动对带宽进行重新分配的带宽管理模块.该模块具有友好的图形化操作界面和合理的带宽配置算法.采用了典型的C/S结构进行模块划分和设计,利用Java语言结合NetBeans等工具完成了具体功能的实现.     

EPON和WLAN融合架构下带宽分配算法的研究

提出和设计了EPON和WLAN融合网络架构下两种上行链路调度算法:集中式带宽分配和分布式带宽分配,对它们的优缺点做了详细分析.理论和仿真实验表明,与集中式带宽分配相比较,分布式带宽分配算法能使融合网络高效运行,可以很好地支持各种业务的QoS,提高了系统吞吐量,降低了各业务的时延.     

三网融合下的动态带宽分配方案研究

以三网融合的接八技术EPON为基础,分析三网融合后不同等级用户、不同等级业务的竞争关系,研完了已有的经典动态带宽分配方案,并根据ONU端不同用户的SLA（服务等级协议）划分,及ONU内部不同优先级业务的划分,设计了支持用户SLA的EPON系统,最后给出一种新的带宽分配算法STFD-DBA,并在理论上分析了该算法的可行性...     

一种保证EPON中DBA公平性的算法

动态带宽分配是以太网无源光网络(EPON)系统的一个重要研究领域,文章提出一种在EPON系统中保证动态带宽分配公平性的新型算法.该算法计算量适中, 同时兼顾了动态带宽分配的效率和公平性.文中通过推导给出了最优算法,并在模拟流量下进行了仿真,通过与已有算法的对比,证明其有很好的性能.     

基于QoS的EPON系统动态带宽分配机制

通过阐述以太网无源光网络（EPON）系统信道传输数据方式以及动态带宽分配的工作原理,进一步研究了动态带宽分配算法（DBA）在EPON系统中的应用。提出一种基于服务质量（QoS）的EPON系统动态带宽分配机制,该机制根据不同业务的优先级和动态带宽分配算法,灵活地分配上行带宽,提高了带宽利用率,改善了服务质量。     

Fixed Mobile Convergence Architectures for Broadband Access: Integration of EPON and WiMAX [Topics in Optical Communications]

EPON and WiMAX are two promising broadband access technologies for new-generation wired and wireless access. Their complementary features motivate interest in using EPON as a backhaul to connect multiple dispersed WiMAX base stations. In this article we propose four broadband access architectures to integrate EPON and WiMAX technologies. The integrated architectures can take advantage of the bandwidth benefit of fiber communications, and the mobile and non-line-of-sight features of wireless communications. Based on these integrated architectures, we elaborate on related control and operation issues to address the benefits gained by this integration. Integration of EPON and WiMAX enables fixed mobile convergence, and is expected to significantly reduce overall design and operational costs for new-generation broadband access networks.     

Adaptive power allocation and call admission control in multiservice WiMAX access networks [Radio Resource Management and Protocol Engineering for IEEE 802.16]

To achieve a successful broadband wireless access solution, the IEEE 802.16 subcommittee has released a series of standards for WiMAX (worldwide interoperability for microwave access). From a technical viewpoint, WiMAX is a feasible alternative to the wired Internet access solutions such as cable modem and DSL. Nevertheless, from the commercial viewpoint, whether the promise of WiMAX will be materialized still depends on its revenue rate to telecom operators and its service quality to the subscribers. In such a context, this article addresses two resource management mechanisms in WiMAX access networks, that is, adaptive power allocation (APA) and call admission control (CAC), from the perspectives of both service providers and WiMAX subscribers. APA emphasizes how to share the limited power resource of base station among different WiMAX subscribers and further influences the access bandwidth of each subscriber; CAC highlights how to assign a subscriber's access bandwidth to different types of applications. Moreover, to build a WiMAX access network, APA and CAC have to work cooperatively to provide cross-layer resource management. In this article we focus on the OFDMA-TDD system, which allows high spectrum-utility efficiency on uplink and downlink channels in the asymmetric scenario of "lastmile" Internet access. We conclude the article with an optimization strategy to balance service provider's revenue and subscriber's satisfaction     

一种EPON上行接入带宽动态带宽分配算法

以太无源光网络综合了PON技术和以太网技术的优点,以其高带宽、低成本、易使用.易升级的优良特性成为目前光接入网的优选方案.文中在IPACT算法的基础上提出了一种支持队列优先级的上行接入带宽分配算法,并构建了基于OPNET的系统仿真模型,评价了在信源到达为Pareto分布下该算法的性能.仿真表明该算法满足业务的QoS,提高了带宽的吞吐率,并保证了各业务队列带宽分配的公平性.     

Resources allocation in an Intserv/Diffserv integrated EPON system

As one of the most promising next-generation access network techniques, the user-oriented Ethemet passive optical network (EPON) should pay more attention to its quality of service (QoS). However, now the EPON adopts mostly differentiated services model (Diffserv) that only provides quality control on traffic aggregation, whereas, the quality of user session cannot be guaranteed when the network is overloaded with substantial connections. This article proposes to apply integrated services model (lntserv) in Diffserv-based EPON, which uses per-flow processing to guarantee QoS. In the simulation, a framework of combined Diffserv and lntserv model is employed in an EPON system, with a dynamic bandwidth allocation algorithm that adapts to it. The simulation results demonstrate that the EPON system with the combined models can provide more flexible, various control for user-oriented service quality.     

在工业网中EPON的DBA算法研究

EPON系统中,上行数据传输的动态带宽分配（DBA）算法是关键技术之一。针对EPON在工业网络通信中的应用,对现有的DBA算法进行了分析和改进,以保证监控和报警等特殊业务的实时送达,消除交叉轮询的带宽浪费,并对该算法进行了仿真实验。仿真结果表明,该算法的带宽利用率高,业务时延抖动低,并且在低负载时无轻载惩罚现象。     

Class-limited algorithm for supporting QoS and fairness in Ethernet passive optical network

Ethernet passive optical network (EPON) becomes a key technology for the next generation broadband access networks due to its cost-effectiveness and high data rate. One of the research issues in EPON is to support service differentiation and fairness. For service differentiation, the conventional limited algorithm is extended with strict priority queuing (SPQ). However, due to ONU-bounded bandwidth allocation, those extensions from the limited algorithm have difficulties in supporting QoS and fairness when the uplink is instantaneously overloaded. To overcome the disadvantages of ONU-bounded bandwidth allocation, instead of allocating the bandwidth on per ONU basis, the proposed class-limited algorithm allocates the bandwidth on per service class basis. Our simulations show that the class-limited algorithm is more efficient to differentiate services and to fairly share residual bandwidth than other limited schemes combined with SPQ, particularly for instantaneous overload condition.