卫星MPLS网络关键技术研究
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摘要
多协议标记交换(Multi-Protocol Label Switching,MPLS)技术为结合IP业务需求和卫星承载网络技术特点实现优化设计提供了一套体系架构,成为下一代宽带卫星组网的重要候选技术。然而,卫星通信具有链路质量差、带宽和处理资源紧张等不同与地面网络的特点。这些特点对MPLS技术实施有何负面影响,如何在这种背景下设计一个优化的MPLS系统,成为必须解决的问题。
本论文首先提出了一个卫星MPLS网络的总体方案,对组网形式、协议框架结构、业务传输方案、信令方案和服务质量体制进行了切合实际的选择和设计,作为本文研究的基础。
可靠的链路资源保障是卫星MPLS网络协调运转的基础。传输误码和Ka频段链路的“雨衰”中断是危害卫星通信链路质量的两个主要因素。
针对卫星通信的高传输误码问题,本论文研究了MPLS标记和其校验机制的设计问题。理论分析了标记差错对MPLS网络承载TCP业务能力影响,并给出了一种基于奇偶校验的标记检验方案。仿真和分析结果表明,本论文给出的数学模型和理论分析能够准确地计算LSP上由于标记差错所造成的TCP会话吞吐量的损失,所给出校验方案简单、有效。
针对Ka频段链路的“雨衰”中断问题,本论文设计了一套标记交换路径(LSP:Label Swith Path)的保护和恢复策略,包括基于线性预测的LSP中断检测方法以及依据地理信息进行备份站选择的策略。为了对方案进行验证,本文还设计了一种“雨衰”序列的合成方法。仿真和分析结果表明,作为物理层手段重要而有益的补充,本文提出的方案能够有效地解决“雨衰”中断带来的LSP中断问题。
有效的链路资源分配机制是实现卫星MPLS网络业务保障的核心。本论文研究了差分服务模型中不同优先级业务之间资源抢占造成的业务中断问题,提出了一种基于主动整形的资源分配方案。数值计算和分析结果表明,通过将系统内的业务分为延时敏感和延时容忍业务,并对后者进行主动整形,有效地降低了业务的带宽需求,减小了业务中断导致的QoS服务性能的损失。
Multi-Protocol Label Switching which has provided a perfect framework for the joint optimaization between IP and satellite becomes an important candinate for the construction of next generation satellite network. Even so, statelite communication has some special features that quit different from terrestrial network, such as bad link quality, lack of bandwith provision and limited processing capacity. What negtieve effects would be introduced by those features and how could we build an optimized system in such enciroment is an important problem that must be resolved.
In this dissertation, we firstly proposed a framework of satellite MPLS network. Some practical design and selection are promoted, such as networking scheme, protocol structure, data transmission method, signaling plan and QoS mechanism, which make up of the basic research environment of this dissertation.
Since a reliable conservation of resources is essential for the operation of MPLS system, then we foused on the performance degradation caused by high bit error rate and rain attenation on Ka band radio link.
In order to counteract with bit errors, we investigated the design of MPLS lablel and its validation mechanism. Theoretic analysis was executed to evaluate the influence on the TCP bearing performance of the LSP in the satellite MPLS network that caused by the label error. The simulation results show that our mathematical model could accurately calculate the throughput loss of TCP session on the LSP. And furthermore, the proposed label validation mechanism which is based on parity check had also been proven to be simple and effective.
Rain attenuation on Ka-band radio link is another problem to the operation of satellite MPLS network. To deal with this issue, we firstly constructed a scheme to generate rain attenuation series that used for the simulation, and then proposed a novel method of LSP’s protection and restoration that not only executes the linear prediticion to detect LSP failure but also uses the geographic information to select the backup site. The simulation results show that our scheme which is an important supplement to physical layer’s solutions could effectively resolve the link interruption caused by rain.
At last, we turned to the resources allocation problem which is critical to the QoS support of satellite MPLS network. In order to avoid call interruption, we divided the traffic into two categories, such as delay-sensitive traffic and delay–tolerable traffic. If there is a resources preemption occured between traffics, system would actively do traffic shaping on delay–tolerable traffic and release bandwidth for the delay-sensitive one. The numerical experiments show that our method could redue the traffic’s bandwidth requirement, and therefore allivate the QoS degration caused by the traffic interruption.
本论文首先提出了一个卫星MPLS网络的总体方案,对组网形式、协议框架结构、业务传输方案、信令方案和服务质量体制进行了切合实际的选择和设计,作为本文研究的基础。
可靠的链路资源保障是卫星MPLS网络协调运转的基础。传输误码和Ka频段链路的“雨衰”中断是危害卫星通信链路质量的两个主要因素。
针对卫星通信的高传输误码问题,本论文研究了MPLS标记和其校验机制的设计问题。理论分析了标记差错对MPLS网络承载TCP业务能力影响,并给出了一种基于奇偶校验的标记检验方案。仿真和分析结果表明,本论文给出的数学模型和理论分析能够准确地计算LSP上由于标记差错所造成的TCP会话吞吐量的损失,所给出校验方案简单、有效。
针对Ka频段链路的“雨衰”中断问题,本论文设计了一套标记交换路径(LSP:Label Swith Path)的保护和恢复策略,包括基于线性预测的LSP中断检测方法以及依据地理信息进行备份站选择的策略。为了对方案进行验证,本文还设计了一种“雨衰”序列的合成方法。仿真和分析结果表明,作为物理层手段重要而有益的补充,本文提出的方案能够有效地解决“雨衰”中断带来的LSP中断问题。
有效的链路资源分配机制是实现卫星MPLS网络业务保障的核心。本论文研究了差分服务模型中不同优先级业务之间资源抢占造成的业务中断问题,提出了一种基于主动整形的资源分配方案。数值计算和分析结果表明,通过将系统内的业务分为延时敏感和延时容忍业务,并对后者进行主动整形,有效地降低了业务的带宽需求,减小了业务中断导致的QoS服务性能的损失。
Multi-Protocol Label Switching which has provided a perfect framework for the joint optimaization between IP and satellite becomes an important candinate for the construction of next generation satellite network. Even so, statelite communication has some special features that quit different from terrestrial network, such as bad link quality, lack of bandwith provision and limited processing capacity. What negtieve effects would be introduced by those features and how could we build an optimized system in such enciroment is an important problem that must be resolved.
In this dissertation, we firstly proposed a framework of satellite MPLS network. Some practical design and selection are promoted, such as networking scheme, protocol structure, data transmission method, signaling plan and QoS mechanism, which make up of the basic research environment of this dissertation.
Since a reliable conservation of resources is essential for the operation of MPLS system, then we foused on the performance degradation caused by high bit error rate and rain attenation on Ka band radio link.
In order to counteract with bit errors, we investigated the design of MPLS lablel and its validation mechanism. Theoretic analysis was executed to evaluate the influence on the TCP bearing performance of the LSP in the satellite MPLS network that caused by the label error. The simulation results show that our mathematical model could accurately calculate the throughput loss of TCP session on the LSP. And furthermore, the proposed label validation mechanism which is based on parity check had also been proven to be simple and effective.
Rain attenuation on Ka-band radio link is another problem to the operation of satellite MPLS network. To deal with this issue, we firstly constructed a scheme to generate rain attenuation series that used for the simulation, and then proposed a novel method of LSP’s protection and restoration that not only executes the linear prediticion to detect LSP failure but also uses the geographic information to select the backup site. The simulation results show that our scheme which is an important supplement to physical layer’s solutions could effectively resolve the link interruption caused by rain.
At last, we turned to the resources allocation problem which is critical to the QoS support of satellite MPLS network. In order to avoid call interruption, we divided the traffic into two categories, such as delay-sensitive traffic and delay–tolerable traffic. If there is a resources preemption occured between traffics, system would actively do traffic shaping on delay–tolerable traffic and release bandwidth for the delay-sensitive one. The numerical experiments show that our method could redue the traffic’s bandwidth requirement, and therefore allivate the QoS degration caused by the traffic interruption.
引文
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