The Design And Implementation Of Three Layer Networking System Based On PTN Technology In Metropolitan Area Network

With the continuous development of mobile communication technology,a large number of Internet business requirements and the rise of Internet of things,business contents of mobile communication are constantly enriched,various terminal computing capabilities continue to increase,and all these factors promote the development of network technology constantly.On November 27 th,2015,China Mobile formally entered the era of full service operation.By July 2017,the cumulative number of users exceeded 850 million,of which 4G users reached 605 million,broadband users reached 95.74 million.With the development of network technology,the development of mobile transmission network has entered the era of all-optical network and IP.Faced with huge number users,metro transport network is also confronting with great crises and challenges.The original SDH network is already unable to meet the needs of business development,the rise of PTN technology initially solved the problem of network capacity and development direction,but it is still not mature in terms of network scheme.How to develop the network structure? How to network in order to better adapt to the business development needs? These are the problems we are facing as well as the main aims of the study.The main work of this thesis is embodied in the following four aspects:(1)This thesis reviews the rapid development of mobile communication network,as well as the development process of PDH,SDH+WDM and PTN+OTN in communication network,and analyzes the evolution process of PTN network.(2)Through data collection and the analysis of relevant data,the thesis studies the principle of PTN technology,and refines the key technology of PTN.Combining with practical application,the study establishes the PTN metropolitan area transport network structure model that adapts to the development of full service operation.Furthermore,the study provides a theoretical basis for the design and construction of the next step Metro Transmission Network.(3)The study investigates the problems existing in the development of Lanzhou mobile metropolitan area transport network.The current network has the defects of complex network,difficult business configuration and low security.The study analyzes the demand of the network from the aspects of capacity,time delay,and safety.Through the research of the three layer network of PTN technology in metro transport network,the study designs a set of mature networking scheme.After optimization and practice,the scheme is successfully applied in Lanzhou mobile metropolitan area network,which meets the transfer demand of flat network,large capacity and low latency.(4)Based on the practical cases in application,Assessment,analysis and experiment of network on four aspects of data collection,case analysis,switching test and performance test.The carrying capacity of the designed network has reached 20,000 base stations,reaching 150% of the original.Business end-to-end network delay reduced to 20 ms,the business bandwidth of single station reached 1GB/S,and the dithering shrank to within 15 ms.Through the test,the study verifies the implementation and effect of the three layer network system PTN technology in metro transport network,which achieves the desired purpose of the scheme.Therefore,the study optimizes the network structure,reduces the net cost,improves network efficiency and enhances the ability to resist the risk,which can meet the needs of the current network business development and the development of the Internet of things.