The Study On Key Techniques Of XPON With Power-Saving Supporting

In recent years, with the rapid growth of bandwidth requirements and number of users, the telecommunication network is developed towarding higher rates continously. In the area of access networks, EPON and GPON technologies are two major technologies, the standardization organizations have been stduying on next-generation PON with higher rates.As the contradiction between energy depletion and the growing energy demand is increasing daily, energy conservation and emission reduction has become the common responsibility of people all over the world, every country has taken action to reduce energy consumption and emissions of carbon dioxide and other pollutants. Studies have shown that 8%of total world energy consumption is consumed by telecommnication networks, which can be larger along with the expanding of networks. Due to the high number of distributed active network elements, access networks consume more than half of the total energy needed by telecommunication networks. As development of PON technologies and the diversification of access services, 10Gb/s PON is faced with more complex network structure and access requirements. It is a matter of urgency to design and develope a functional integrity, secure and reliable network management system to improve the efficiency of network management. Therefore, how to reduce the energy consumption of network, especially passive optical network, and how to manage PON system powerfully, have become more and more important in xPON research field.For the key technologies of energy-saving and network management systems for xPON, this paper focus on the study of energy efficient 10G EPON and XG-PON system, and the design of the network management systems for 10G EPON. The main content is displayed as follows: 1. A novel power saving mechanism for 10G EPON is proposed based on a centric dynamic bandwidth algorithm(DBA). The OLT assigns upstream and downstream bandwidth allocations for all ONUs in a centric way at the very beginning of every DBA cycle, and informs ONUs to sleep within a period or sleep for several periods depending on the previously average traffic load in both downstream and upstream. The simulation system is setup based symmetric 10G EPON system, and has the same network load in upstream and downstream links, and ignores the impact of synchronization and other factors. In the simulation scenario, the results show that the proposed 10G EPON power-saving mechanism can minimize the energy consumption of ONU effectively. When 10G EPON system is not at full capacity, the average delay and packet loss of all ONUs is small relatively to minimize the impact of system’s quality of service.2. This paper studies of the existing enengy-saving modes for XG-PON, analyzes the power states and state transition diagram of OLT and ONU in power management. Based on the standard energy-saving mechanism, this paper provides detailed definition of the parameter range of XG-PON system that supports the doze mode and the cyclic sleep mode, including the generation condition of LSI, LDI, LWI and SA(OFF), etc.3. This paper analyzes the functionality upgrade requirements for 10G EPON network management system, outlines the software design for each module in management system. It also proposes a bandwidth management solution based on time allcation for the co-exist system of 1Gb/s and 10Gb/s in upstream direction for 10G EPON.