The admission control issue in the design of a centralized bandwidth broker model for dynamic control and management of QoS provisioning is studied. A two-phase differentiated flow treatment based dynamic admission co...The admission control issue in the design of a centralized bandwidth broker model for dynamic control and management of QoS provisioning is studied. A two-phase differentiated flow treatment based dynamic admission control scheme under the centralized bandwidth broker model is proposed. In the proposed scheme, the flow requests are classified into two classes and get differentiated treatment according to their QoS demands. We demonstrate that this admission control scheme can not only improve the resource utilization but also guarantee the flows＇ QoS. Furthermore, the admission control is divided into two phases： edge admission control and interior admission control. During the interior phase, the PoQ scheme is adopted, which enhances the call processing capability of the bandwidth broker. The simulation results show that the proposed scheme can result in lower flow blocking probability and higher resource utilization. And it also reduces the number of QoS state accesses/updates, thereby increasing the overall call processing capability of the bandwidth broker.展开更多
This paper presents a novel model for dynamic bandwidth allocation and rate coordination based on DiffServ and a bandwidth broker（BB）. In this model, assignment of bandwidth was made according to a periodic trace of...This paper presents a novel model for dynamic bandwidth allocation and rate coordination based on DiffServ and a bandwidth broker（BB）. In this model, assignment of bandwidth was made according to a periodic trace of network characteristics per application. And adjustment of transfer rate was accomplished through negotiation with applications by a bandwidth agent. This model was evaluated using network simulator 2 （NS-2）, and distinct improvements were found in respects of delay and packet loss of overall network and single flow. Finally, the model was suggested to be leveraged to multimedia applications with properties of lower delay and lower packet loss.展开更多
提出了区分服务网络的一种基于集中式带宽代理(bandwidth broker,BB)的接纳控制方案并将其扩展到组播环境中,其目的是为了在区分服务网络提供端到端的服务质量(quality of service,QoS)保证.带宽代理管理与维护区分服务网络域内的QoS状...提出了区分服务网络的一种基于集中式带宽代理(bandwidth broker,BB)的接纳控制方案并将其扩展到组播环境中,其目的是为了在区分服务网络提供端到端的服务质量(quality of service,QoS)保证.带宽代理管理与维护区分服务网络域内的QoS状态信息和组播信息,并在网络域外的QoS信令或组播消息帮助下完成接纳控制与资源预留.实验结果表明该方案具有比基于显式信令的分布式接纳控制方案更好的性能和更高的资源利用率,并能为区分服务网络的组播成员提供QoS保证.展开更多
如何在IPv6 over MPLS网络中提供端到端的服务质量?针对这个问题介绍了一个6PE-DiffServ解决方案(6PE,IPv6 Provider Edge Routers)。该方案使用6PE技术进行组网,通过统一的DiffServ策略的部署和BB-6PE(Bandwidth Broker for 6PE netwo...如何在IPv6 over MPLS网络中提供端到端的服务质量?针对这个问题介绍了一个6PE-DiffServ解决方案(6PE,IPv6 Provider Edge Routers)。该方案使用6PE技术进行组网,通过统一的DiffServ策略的部署和BB-6PE(Bandwidth Broker for 6PE network)的集中管理,给由IPv4向IPv6过渡的网络提供DiffServ服务。6PE-DiffServ方案的可行性和有效性在CNGI-QoS实验网中得到了验证。展开更多
文摘The admission control issue in the design of a centralized bandwidth broker model for dynamic control and management of QoS provisioning is studied. A two-phase differentiated flow treatment based dynamic admission control scheme under the centralized bandwidth broker model is proposed. In the proposed scheme, the flow requests are classified into two classes and get differentiated treatment according to their QoS demands. We demonstrate that this admission control scheme can not only improve the resource utilization but also guarantee the flows＇ QoS. Furthermore, the admission control is divided into two phases： edge admission control and interior admission control. During the interior phase, the PoQ scheme is adopted, which enhances the call processing capability of the bandwidth broker. The simulation results show that the proposed scheme can result in lower flow blocking probability and higher resource utilization. And it also reduces the number of QoS state accesses/updates, thereby increasing the overall call processing capability of the bandwidth broker.
文摘This paper presents a novel model for dynamic bandwidth allocation and rate coordination based on DiffServ and a bandwidth broker（BB）. In this model, assignment of bandwidth was made according to a periodic trace of network characteristics per application. And adjustment of transfer rate was accomplished through negotiation with applications by a bandwidth agent. This model was evaluated using network simulator 2 （NS-2）, and distinct improvements were found in respects of delay and packet loss of overall network and single flow. Finally, the model was suggested to be leveraged to multimedia applications with properties of lower delay and lower packet loss.
文摘提出了区分服务网络的一种基于集中式带宽代理(bandwidth broker,BB)的接纳控制方案并将其扩展到组播环境中,其目的是为了在区分服务网络提供端到端的服务质量(quality of service,QoS)保证.带宽代理管理与维护区分服务网络域内的QoS状态信息和组播信息,并在网络域外的QoS信令或组播消息帮助下完成接纳控制与资源预留.实验结果表明该方案具有比基于显式信令的分布式接纳控制方案更好的性能和更高的资源利用率,并能为区分服务网络的组播成员提供QoS保证.
文摘如何在IPv6 over MPLS网络中提供端到端的服务质量?针对这个问题介绍了一个6PE-DiffServ解决方案(6PE,IPv6 Provider Edge Routers)。该方案使用6PE技术进行组网,通过统一的DiffServ策略的部署和BB-6PE(Bandwidth Broker for 6PE network)的集中管理,给由IPv4向IPv6过渡的网络提供DiffServ服务。6PE-DiffServ方案的可行性和有效性在CNGI-QoS实验网中得到了验证。
