共查询到19条相似文献,搜索用时 125 毫秒
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区分服务模型是 IETF提出的用于在 Internet上支持 Qo S的重要机制。首先说明了区分服务模型提出的背景 ,然后讨论了区分服务模型的技术特点和研究现状 ,最后详细阐述了区分服务研究和实现的各个方面 ,并对区分服务的应用前景提出了一些看法 相似文献
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Internet区分服务模型及其实现策略 总被引:2,自引:0,他引:2
区分服务模型是IETF提出的用于在Internet上支持QoS的重要机制。首先识别了区分服务模型提出的背景,然后讨论了区分服务模型的技术特点和研究现状,最后详细阐述了区分服务研究和实现的各个方面,并对区分服务的应用前景提出了一些看法。 相似文献
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用于无线视频传输的分级编码策略研究 总被引:3,自引:0,他引:3
研究一个运用分级编码进行点对点和点对多点无线视频传输的方案,该方案简化了呼叫接纳控制机制,采用区分处理、有条件重传等策略来提高无线视频传输的可靠性和有效性,最后给出一个采用分级编码的无线视频传输模型. 相似文献
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二相编码脉冲信号的距离多普勒信号处理 总被引:1,自引:0,他引:1
基于伪随机二相编码连续波和相干脉冲串信号的特点,提出一种脉间二相编码脉冲雷达信号及其处理的一般模型和等效简化模型,同时给出了该信号处理方法用于点目标的仿真结果。最后,结合雷达高度表回波信号的特点,较为详细地讨论了脉间二相编码信号在雷达高度表中的应用,也给出了仿真结果。 相似文献
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区分服务模型是一种在固定Internet中提供服务质量保证的服务模型,但是它并不是为移动环境设计的,特别是当采用移动IP作为移动管理协议时,区分服务模型会引起一系列问题。本文讨论和分析了移动环境下区分服务模型存在的问题,并且提出了一些解决方案。 相似文献
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基于QoS的3G网络系统设计与研究 总被引:2,自引:1,他引:1
为了有效地解决无线通信网络在宽带业务不断增加时产生的拥塞问题,提出了将区分服务模型应用于第三代移动通信网络以满足不同业务对QoS的需求。详细分析了区分服务模型的关键技术以及区分服务模型的系统结构,将区分服务模型和第三代移动通信分组域核心网系统结合起来,设计了支持QoS的第三代移动分组域核心网络。实验表明提出的模型较好地解决了第三代移动网络分组域核心网的QoS问题,提高了对不同业务的服务质量。 相似文献
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为了在光突发交换网络中支持区分服务,提出了一种新颖的控制分组调度算法,即基于优先级权重的公平队列调度算法.近似的调度分析模型用来简化对不同级别的调度权重的求解.:同时定义了一种参数来评估分析模型的有效性和调度算法的公平性.仿真试验结果证实了该分析模型在负载较高时是非常有效的,而且调度算法能提供很好的公平性. 相似文献
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A flexible and distributed architecture for adaptive end-to-end QoS provisioning in next-generation networks 总被引:3,自引:0,他引:3
Jie Yang Jian Ye Papavassiliou S. Ansari N. 《Selected Areas in Communications, IEEE Journal on》2005,23(2):321-333
A novel distributed end-to-end quality-of-service (QoS) provisioning architecture based on the concept of decoupling the end-to-end QoS provisioning from the service provisioning at routers in the differentiated service (DiffServ) network is proposed. The main objective of this architecture is to enhance the QoS granularity and flexibility offered in the DiffServ network model and improve both the network resource utilization and user benefits. The proposed architecture consists of a new endpoint admission control referred to as explicit endpoint admission control at the user side, the service vector which allows a data flow to choose different services at different routers along its data path, and a packet marking architecture and algorithm at the router side. The achievable performance of the proposed approach is studied, and the corresponding results demonstrate that the proposed mechanism can have better service differentiation capability and lower request dropping probability than the integrated service over DiffServ schemes. Furthermore, it is shown that it preserves a friendly networking environment for conventional transmission control protocol flows and maintains the simplicity feature of the DiffServ network model. 相似文献
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The architecture in a differentiated services (DiffServ) network is based on a simple model that applies a per‐class service in the core node of the network. However, because the network behavior is simple, the network structure and provisioning is complicated. If a service provider wants dynamic provisioning or a better bandwidth guarantee, the differentiated services network must use a signaling protocol with QoS parameters or an admission control method. Unfortunately, these methods increase the complexity. To overcome the problems with complexity, we investigated scalable dynamic provisioning for admission control in DiffServ networks. We propose a new scalable qDPM2 mechanism based on a centralized bandwidth broker and distributed measurement‐based admission control and movable boundary bandwidth management to support heterogeneous QoS requirements in DiffServ networks. 相似文献
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Efficient delivery of real-time multicast traffic imposes on the underlying network infrastructure the burden of supporting quality of service. This can be quite a complex issue in a differentiated services IP network, especially if multicast users are allowed to join and leave the multicast tree dynamically. In fact, since DiffServ lacks explicit reservation states, a replicating node cannot test whether a corresponding reservation exists on an output link, and upon a dynamic join of a QoS multicast user, the DiffServ network lacks control functions to verify whether resources are available along the new path. We present a solution to support dynamic multicast with QoS over a DiffServ network. Our solution combines two ideas. First, resource availability along a new QoS path is verified via a probe-based approach. Second, QoS is maintained by marking replicated packets with a special DSCP (differentiated service code point) value before forwarding them on the QoS path. 相似文献
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完整的服务质量(QoS)解决方案是通信网络融合中的重要课题,引入基于IP多媒体子系统(IMS)框架的、具有QoS保证的资源控制架构是解决融合网络QoS问题的重要方法.本文在介绍基于综合服务与区分服务相结合的IMS QoS服务模型的基础上,详细讨论IMS网络中的QoS控制结构、资源控制和QoS授权等问题. 相似文献
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We focus on DiffServ for QoS provisioning in radio access networks (RANs). We first give short explanations of the DiffServ model. We then investigate the problems of DiffServ under IP mobility environments. We also present several DiffServ proposals in IP-based access networks. We finally propose a mobility-aware drop precedence scheme for flows experiencing handover events. 相似文献