| With the rapid development of broadband services such as video telephony, IPTV, video on demand, online games and so on, the requirements of network capacity, speed, quality are also increasing. Traditional access technologies such as ADSL, Ethernet, coaxial cable etc, can not fully meet the needs of network development. With the great advantage of bandwidth capacity and distance, fiber access technology is becoming a new direction of broadband access network, and the "Light of Copper" has become an inevitable trend.Passive optical network use fiber as its transmission medium. Comparing with other optical access technology, PON has some obvious advantages, such as high bandwidth, full passive spectral transmission, carrier-class management. Therefore, the research of the optical access network in this article, is on line with the current general direction of the communications industry. As the environment changing, business growing, technological changing and other factors, there are many problems in existing network, such as the uneven distribution of resources, inefficient use, high maintenance costs and so on. One reason is the inefficient artificial network planning, with the lack of scientific and effective data analysis, the design is not conducive to post-expansion, and leading to duplication. Therefore, the research of passive optical network planning algorithm and planning software algorithm has important practical significance. Present practical PON network planning software in the industry is still in blank. Although there are many theoretical studies, but not really a mature product can be used for the actual engineering design. Meanwhile, as a hot carrying technology for triple play services, the open performance and management efficiency are two major problems to PON network management. Technical differences between various PON standards and not uniform in management, increasing the risk of technology selection and the difficulty of maintenance management to the carriers. Convergence management for PON and bandwidth allocation technique will help to enhance the research network efficiency and maintenance ability. It has a practical significance to the communication industry.In this article,we has an in-depth study key technologies of PON network planning and management, the main research content and innovative work in article include the following.1. PON network planning algorithmPON network planning problems such as CO position selecting, OLT system configuration, are transformed into the TSP. Based on solving TSP,we do a detailed research of drift and volatility calculation factor design, calculation of the particle radius, selecting attracting element issues, and propose the ITO PON network planning algorithm to solve the problem,which is the combination of the local search technology and the ITO algorithm.2. Planning and design for the deployment of CO and OLTThrough detailed research for CO region of the mesh, the business predict logic calculations, system configuration calculation methods and some other issues. By the mathematical model of CO zoning and OLT deployment planning, we use the greedy algorithm for the initial division of CO region. Then, ITO algorithm is used to complete business forecast, CO area optimization and range positioning search range. Finally, we use geographical positioning of ant colony algorithm to complete the calculation of OLTs configuration.3. ODN planning and designBy research the the mesh of FDT area and the optimization calculations of POS and FAT, we can get total design solution and a planning software for ODN. By the software analysis, we can complete network planning and design for the ODN. With it,we can calculate the cost of network construction and output the planning design of target regional.4. PON Converged Management ResearchResearch a converged infrastructure and management solution to achieve10GEPON and EPON, GPON, XGPON coexisting in the same ODN.First,with the design of a similar10GEPON PCS layer for XGPON physical layer, making the two co-exist in the physical layer. Second, with the design of a hybrid frame-link layer protocol, making10GEPON and XGPON frames can be identified and managed at the same time. Third,with the design of the OMCI ethernet frame format, achieve EPON and10GEPON being managed by OMCI.5. PON bandwidth allocation algorithm optimizeThe key issue of PON bandwidth allocation is difficult to guarantee QoS for multi-service carrying. By designing the MS-DBA algorithm,which can be divided into multiple sub-cycles for different service queues. According to the priority in PON network, different service queues in each ONU are divided into the PF and CF sub-cycle, thereby reducing the delay of high-priority services. This paper also presents the MSDCP algorithm,which can dynamically adjust the polling time window for avoiding the low bandwidth utilization on light load.Through these researches, first,we solve PON planning problem and algorithm design. Second, we solve the problem of different PON technologies coexist on the same ODN. Third, we solve the problem of efficiency bandwidth allocation and optimize the quality of services. Finally, we presents a vision of the direction for future research,such as further improvment of ITO algorithm,10GEPON PCS layer of efficiency for XGPON, the accuracy and efficiency issues of polling cycle window control for MSDCP algorithm. |
