Research On Quality Of Service In Packet Transport Network (PTN)

Packet Transport Network (PTN) technology, regarding carrier-class Ethernet servicesand traditional ATM services and time division operations support as the unique advantages,becomes the first choice for the future network transmission technology. In order to ensurethe application and popularization of PTN network, the organizations have been makingspecific technical standards for data plane, OAM, network security, network managementand control plane etc. Unlike traditional SDH network technology, PTN as the new type oftransmission technology meets meet the power transmission, all-IP, intelligent, broadbandtrends requirements. Power distribution service diversity requires different delay, jitter andbandwidth. Power distribution communications networks based on PTN technology must beable to provide QoS mechanisms to meet the different quality of service requirements ofdifferent traffic. On the basis of performance indicators, the design of link layer routingoptimization is the key technical issues in intelligent control and scheduling of PTN network.With respect to the data-oriented applications, multimedia applications have too manyrequirements. As a result, traditional routing algorithms are no longer applicable. The mainperformance parameters of multimedia applications are the delay, differential delay andmean opinion score. From a network perspective, these performance parameters becomedelay, jitter and bandwidth parameters. The route calculation of network performance is amulti-objective optimization problem, some objectives need to be optimized, such asbusiness performance and network resource utilization and so on. As the network scale andtypes of business surge, the bearing network of telecom operators has been developed from asingle-service into a multi-service integrated one. The plan on designing a new bearingnetwork, as well as the deployment and the test needs to consider the strict requirements ofmulti-service bearing, and synthetically use techniques like MPLS and QoS in order to theguarantee the bearing and transmission of multi-service. Based on the above issues, the mainwork of this paper includes the following aspects:(1) This article describes the PTN network architecture and key technologies, includingstratified multi-service transport network model, multi-service bearer, data forwarding, QoSguarantee mechanism for networking, high-performance end-QAM scheme, PTN networksurvivability characteristics and QoS tactics PTN network etc. (2) This paper studies the QoS routing technology on the basis of MPLS trafficengineering, learns the MPLS traffic Technology-related and engineering-related content,including QoS characteristics of MPLS and MPLS frame structure. The QoS routing policiesbased on MPLS traffic engineering in the real network are tested. The test results verify thatthe QoS routing technology can improve the resource utilization of the network and achievethe performance optimization.(3) Based on the network topologies of8Bureau of Jinzhou City Telecom Dalingbusiness departments, this paper do research into QoS deployment schemes of PTN MAN.PTN MAN service bearer and core layer, convergence layer, QoS user access layer devicedeployment principles and safeguard policies are considered. And with reference to thedevice type and network models, this paper tests network performance and verifies thehierarchical QoS support capabilities.