共查询到19条相似文献,搜索用时 156 毫秒
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针对目前PF改进型算法在LTE系统中保障增值业务GBR和区分增值业务速率的研究较少的问题。提出一种改进型PF算法,该算法通过引入信道控制因子、GBR保障因子和速率门限因子,从而实现增值业务的下行跨层调度。仿真结果表明该算法可以保障各增值业务的GBR以及实现不同付费等级的付费平均可达速率,同时保证增值业务用户间的公平性。 相似文献
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光突发交换网络中支持业务区分的多路由机制研究 总被引:1,自引:1,他引:0
针对光突发交换(OBS)网络的多路由机制多是考虑一种业务而对多业务区分的多路由机制研究偏少这种现状,提出了一种支持业务区分的多路由(MRSD)机制。在发送各个服务等级的业务之前,首先在没有共享风险链路的多条路由上发送请求包获得各条路由上的多种优先级业务的负载情况,然后根据爱尔兰固定点近似分析法计算各种优先级业务在不同路由上的丢包率,并为每种优先级业务选择一条使本业务丢包率最小的路由;在一个核心节点内,则采用基于额外偏置时间的业务区分方法实现不同优先级业务的区分,将各种业务根据链路状态信息分配到没有共享风险链路的多条路由上去传输,从而在减少突发丢失率(BLP)的同时实现了多种优先级业务在路由上的区分。仿真结果表明,这种多路由机制能够有效降低网络的BLP,实现区分服务。 相似文献
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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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为适应网络的动态性,提高调度公平性和资源效率,流感知优先公平调度机制需要动态的多业务区分转发。与链路负载状态相关的模糊流感知能够实现路径上的一致性业务区分,而基于模糊流感知的动态优先公平调度算法通过调整优先队列负载门限在流式流和弹性流之间实现转发优先权的动态交替,在链路轻载时实现不同流间的相对公平调度,在链路重载时则强调实时业务的绝对优先权以保证其时延要求。算法公平性分析和仿真计算显示提出算法的动态区分转发通过适度增加优先业务队长能够大幅度提高弹性流的接纳率,具有较高的链路平均吞吐量和资源效率。 相似文献
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传统的尽力而为的转发机制由于Internet的飞速发展,已经不能满足用户的要求。为此,对区分业务方案的具体系结构及实现环节作了详细的介绍,并讨论了其在IP城域网的实施。与其它机制相比,区分业务实现简单、系统开销少,能在骨干网中有效地保证服务质量。 相似文献
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目前电信网络服务尚无服务质量控制机制,无法为用户提供区分服务和性能保证,使得特殊用户的网络服务质量受到严重影响。这就要求网络提供商对其服务组合的服务质量进行建模评估。文中主要讨论面向服务质量的服务组合方法和保证组合服务执行过程中业务功能和服务质量的方法。研究影响网络服务质量的相关参数。从用户的角度出发,建立服务组合的服务质量模型,并从用户和网络提供商两方面考虑,讨论改善服务质量的实际方法。 相似文献
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A survey of current network policy languages is presented. Next, a summary of the techniques for detecting policy conflicts is given. Finally, a new language, path-based policy language, which offers improvements to these is introduced. Previous network policy languages vary from the very specific, using packet filters at the bit level, to the more abstract where concepts are represented, with implementation details left up to individual network devices. As background information a policy framework model and policy-based routing protocols are discussed. The PPL's path-based approach for representing network policies is advantageous in that quality of service and security policies can be associated with an explicit path through the network. This assignment of policies to network flows aids in new initiatives such as integrated services. The more stringent requirement of supporting path-based policies can easily be relaxed with the use of wild card characters to also support differentiated services and best-effort service, which is provided by the Internet today 相似文献
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支持区分服务的全光网络设计和实现 总被引:1,自引:0,他引:1
随着光层业务对传送服务质量的要求趋于多样化以及全光网络的智能化演进,光服务等级协定被提出。为了适应各种业务的不同传送需求,未来的光网络碰具有支持区分服务的能力。在多业务环境下。处理好满足业务的不同服务需求和优化网络资源之同的矛盾。需要传送网络流量工程各个功能子模块具有集成多种实现机制的能力,从而在光层实现区分服务的集成化。目前,支持区分服务的光网络流星工程方案还只是研究领域的成果,需要对现有控制平面的协议进行扩展和标准化,从而使光服务等级协定走向实用。 相似文献
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A case for relative differentiated services and the proportionaldifferentiation model 总被引:1,自引:0,他引:1
Internet applications and users have very diverse quality of service expectations, making the same-service-to-all model of the current Internet inadequate and limiting. There is a widespread consensus today that the Internet architecture has to extended with service differentiation mechanisms so that certain users and applications can get better service than others at a higher cost. One approach, referred to as absolute differentiated services, is based on sophisticated admission control and resource reservation mechanisms in order to provide guarantees or statistical assurances for absolute performance measures, such as a minimum service rate or maximum end-to-end delay. Another approach, which is simpler in terms of implementation, deployment, and network manageability, is to offer relative differentiated services between a small number of service classes. These classes are ordered based on their packet forwarding quality, in terms of per-hop metrics for the queuing delays and packet losses, giving the assurance that higher classes are better than lower classes. The applications and users, in this context, can dynamically select the class that best meets their quality and pricing constraints, without a priori guarantees for the actual performance level of each class. The relative differentiation approach can be further refined and quantified using the proportional differentiation model. This model aims to provide the network operator with the “tuning knobs” for adjusting the quality spacing between classes, independent of the class loads. When this spacing is feasible in short timescales, it can lead to predictable and controllable class differentiation, which ore two important features for any relative differentiation model. The proportional differentiation model can be approximated in practice with simple forwarding mechanisms (packet scheduling and buffer management) that we describe 相似文献
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在网络内部,DiffServ可以提供很好的QoS保障,但在跨运营商的情况下,只能提供出方向的保障.本文提出一种新的双向区分服务技术方案--Bi-DiffServ,可以用于各运营商网络之间的互连点上,为重要流量提供时延和带宽的保障.通过仿真和现网实验证明,该方案简单、高效,能明显改善重要流量的时延、带宽等网络服务质量. 相似文献
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Movsichoff B.A. Lagoa C.M. Hao Che 《Selected Areas in Communications, IEEE Journal on》2005,23(2):293-303
This work addresses the problem of optimal traffic engineering in a connectionless autonomous system. Based on nonlinear control theory, the approach taken in This work provides a family of optimal adaptation laws. These laws enable each node in the network to independently distribute traffic among any given set of next hops in an optimal way, as measured by a given global utility function of a general form. This optimal traffic distribution is achieved with minimum information exchange between neighboring nodes. Furthermore, this approach not only allows for optimal multiple forwarding paths but also enables multiple classes of service, e.g., classes of service defined in the differentiated services architecture. Moreover, the proposed decentralized control scheme enables optimal traffic redistribution in the case of link failures. Suboptimal control laws are also presented in an effort to reduce the computational burden imposed on the nodes of the network. Finally, an implementation of these laws with currently available technology is discussed. 相似文献