A Study On Optimization Of Packet Transport Network Of Chinamobile Guizhou Corporation Guiyang Branch

In recent years,with the rapid development of Guiyang Mobile's 4G service,home-wide service and customer-gathering service this year,the construction scale of Guiyang Mobile LTE base station is increasing,home-wide service and customer-gathering service are speeding up,and the coverage of home-wide service is expanding.Guiyang Mobile PTN bearer network needs to meet the needs of IP,mobile broadband,high quality service assurance and multi-service access.The scale of Guiyang Mobile PTN is also expanding day by day,and the problem of insufficient network capacity and security is becoming more and more prominent.Reasonable optimization schemes should be put forward.The main work and achievements of this thesis are as follows:1?This thesis expounds the development of PTN,analyses three traditional carrier technologies of mobile operators,and analyses related technologies at home and abroad.It is concluded that PTN technology is the real requirement of packet carrier of China Mobile.The current situation of Guiyang Mobile PTN network is sorted out in detail.Guiyang Mobile PTN transmission network can be divided into three layers: core,convergence and access.The current network structure is mature and stable(up to the end of 2017).Based on the development demand of future wireless,home-wide and customer-gathering services of Guiyang Mobile,this paper establishes three service demand models for PTN network: 2G service 8M/station,3G service 10M/station,LTE service 40M/station,home-wide service 3.62M/household,customer-gathering service according to actual needs.Through traffic prediction and architecture optimization,corresponding optimization schemes for PTN core layer,convergence layer and access layer are formulated.2?PTN Core Layer: In 2017,LTE business is carried by two sets of urban and one set of suburban county,a total of three sets of PTN Core Layer equipment.At present,the number of LTE base stations under each set of equipment is more than 3000.The core level equipment of each district and county does not support L3 function,nor upgrade of single port of 100 G or above.Through traffic prediction and security analysis of LTE service load: in the core layer of 2018,the traffic of each district and county exceeds 20 G,and the total traffic is nearly 500 G.At present,Guiyang Mobile's L2-to-L3 equipment maintains a large number of IP/MAC information of base stations.L2-to-L3 equipment and base stations need to interact with a large amount of information,which leads to the complexity of L2-to-L3 scheme.If there is a fault,recovery technology is difficult.In 2018,the core layer equipment supporting L3 function will sink to all districts and counties,each district and county will carry less than 1500 LTE base stations,and will also support upgrades of single ports above 100 G and 100 G.It improves the security and bearing capacity of the core layer.3?PTN Convergence Layer: In 2017,Guiyang Mobile PTN Convergence Layer has 45 loops and 182 convergence points.Through the flow forecast: in 2018,41 convergent circulation will exceed 10 G.In 2018,nine rings in Guiyang Mobile Convergence Layer will sink OTN and 24 rings will be upgraded.It improves the bearing capacity of the convergent layer.4?PTN access layer: In 2017,the PTN network access layer of Guiyang Branch has 5592 network elements,a total of 983 loops and 1205 access chains.The loop formation rate of the whole network is 69%,and the double return ratio of access ring is 91%.According to the current situation,the target of PTN access layer is to increase the ring formation rate to 85% and the double return ratio to 95%.It improves the security of access layer.