To solve the problem of optical path creation in multi-granularity optical network, a multi-granular hierarchy label is proposed in this paper. A parallel signaling scheme using hierarchy label is discussed in detail. Simulation result shows that the new proposal has a better time performance than traditional hierarchy LSP signaling scheme.
Multi-granularity switching is an attractive technology, which can not only save the network cost but also realize traffic grooming. There are many different sizes tunnels available in multi-granularity optical network, so resource assignment becomes very important for lightpath establishment. In this paper, we focus on the research in waveband switching (WBS) network. Firstly the node structure and multi-granularity connections are analyzed, and the term of RRA (routing and resource assignment) is proposed to state the problem of lightpath establishment. And a kind of resource assignment policy for RRA is proposed according to the tunnel granularity. As a part of resource assignment in WBS network, the problem of waveband paths assignment is discussed and several new dynamic algorithms are proposed. They are SBP (shortest waveband path), FBP (first-fit waveband path), LBP (longest waveband path) and LBC (longest waveband combination) algorithms. In our numerical simulations, some factors that impact the performance of network are analyzed, such as waveband assignment algorithm, switching ratios and waveband partition. And also some useful conclusions are drawn, which are instructive for the design and implementation of multi-granularity network.
This paper studies design and provision problem of OVPN over ASON. Some special issues are dedicated, including address translation, access authentication, OVPN membership management. UNI framework which supports OVPN over ASON is presented. And procedures of OVPN operation are designed.