Key Technologies Research In Multi-Layer And Multi-Domain Optical Networks For Broadband Packet Services

Driven by huge bandwidth requirement from explosive growth of packet service represented by IP and emergence of various new services, optical network technologies are evolving rapidly. Meanwhile, the rapid development of optical network technologies also promotes the rapid growth of broadband streaming media applications. Then, the broadband packet services such as video become the main driver for the operator’s network transformation. One of the most important characters of the future transport networks is to support packet transport and meet different QoS requirement for various broadband packet services. At the same time, with the scale of networks increasing and the emergence of heterogeneous networks, multi-layer and multi-domain optical networks will be the main trend of future optical transport networks. The network design, resource configuration and optimization of multi-layer and multi-domain optical networks are becoming the research hotspots in transport networks.During the PhD, as one of the main participants, the author completed one project of the national high-tech research and development program and some research projects cooperated with companies. Supported by these projects, the author conducted some deep research on packet service model and features, management, maintenance and protection mechanisms of T-MPLS/MPLS-TP, network design and domain division issues of multi-layer and multi-domain optical networks. The main innovative contributions are listed as follows.Based on different service features and QoS requirements, the paper gives the traffic model of self-similarity service and streaming media service, builds the generation module of self-similarity services and makes the simulation work, proposes a hierarchical simulation solution of streaming media, designs the simulation process of the storage streaming media service and on-line streaming media, and gives the data results of this two kinds pf services.After analyzing the requirement of OAM and protection of packet transport networks, this paper proposes an optimization method to assure the correct order of packets and reduce the packet loss rate, simulation results show that the proposed method has good performance in average delay time and average packet loss rate.The PCE’s location problem has also been researched in PCE based multi-domain optical networks, and the mathematical model of PCE’s location in multi-domain optical networks has been first built based on quadratic integer programming algorithm.Based on the model above, this paper proposes two PCE’s location selection algorithms, i.e. Global Optimization algorithm (GOP) and distributed Optimization algorithm (DOP), simulation results show that the proposed algorithms can obviously reduce the communication overhead. Especially, the proposed DOP algorithm can approach the optimal result without knowing the global topology information.