
Type of Document Dissertation Author Yi, Tong Author's Email Address tyi1@lsu.edu URN etd11162005111427 Title Broadcast in Sparse Conversion Optical Networks Using Fewest Converters Degree Doctor of Philosophy (Ph.D.) Department Computer Science Advisory Committee
Advisor Name Title Sukhamay Kundu Committee Chair Bert Boyce Committee Member Donald Kraft Committee Member Jianhua Chen Committee Member Stephen Shipman Dean's Representative Keywords
 optical networks
 broadcast
 converters usage problem
 sparse conversion
Date of Defense 20051007 Availability unrestricted Abstract Wavelengths and converters are shared by communication requests in optical networks. When a message goes through a node without a converter, the outgoing wavelength must be the same as the incoming one. This constraint can be removed if the node uses a converter. Hence, the usage of converters increases the utilization of wavelengths and allows more communication requests to succeed. Since converters are expensive, we consider sparse conversion networks, where only some specified nodes have converters. Moreover, since the usage of converters induces delays, we should minimize the use of available converters.
The Converters Usage Problem (CUP) is to use a minimum number of converter so that each node can send messages to all the others (broadcasting). In this dissertation, we study the CUP in sparse conversion networks.
We design a linear algorithm to find a wavelength assignment in tree networks such that, with the usage of a minimum number of available converters, every node can send messages to all the others.
This is a generalization of [35], where each node has a converter. Our algorithm can assign wavelengths efficiently and effectively for onetoone, multicast, and broadcast communication requests.
A converter wavelengthdominates a node if there is a uniform wavelength path between them. The Minimal Wavelength Dominating Set Problem (MWDSP) is to locate a minimum number of converters so that all the other nodes in the network are wavelengthdominated. We use a linear complexity dynamic programming algorithm to solve the MWDSP for networks with bounded treewidth. One such solution provides a low bound for the optimal solution to the CUP.
Files
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higherspeed Access Yi_dis.pdf 600.82 Kb 00:02:46 00:01:25 00:01:15 00:00:37 00:00:03