Showing papers by "Kyeong Soo Kim published in 2011"

Clean-slate design of next-generation optical access

Abstract: We report the current status of our research on the clean-slate design of next-generation optical access (NGOA). We have been studying candidate architectures with a major focus on their elasticity to user demands, energy efficiency, and support of better Quality of Experience (QoE). One of the major challenges in this study is to establish a comparative analysis framework where we can assess the performances of candidate architectures in an objective and quantifiable way. In this paper we describe our efforts to meet this challenge: (1) the development of a new comparison framework based on integrated QoE and statistical hypothesis testing and (2) the implementation of a virtual test bed capturing important aspects from physical layer to application layer to end-user behaviour governing traffic generation. The comparison framework and the virtual test bed will provide researchers a sound basis and useful tools for comparative analysis in the clean-slate design of NGOA.

Integration of OMNeT++ Hybrid TDM/WDM-PON Models into INET Framework

Abstract: It is critical to take into account both the interactive nature of actual trac resulting from TCP congestion control and the end-user service experiences at the application layer in assessing the performances of next-generation optical access architectures. In this paper we present the results of our eorts to integrate OMNeT++-based hybrid time division multiplexing (TDM)/wavelength division multiplexing (WDM)-passive optical network (PON) simulation models | the models up to the data link layer which were originally developed for the study of Stanford University aCCESSHybrid PON (SUCCESS-HPON) architecture | into the INET framework where we can provide an end-to-end simulation environment with end-user applications, including new application-layer trac models for Internet web browsing (HTTP), le downloading (FTP), and HDTV-quality streaming video, as well as a complete TCP/IP protocol stack. Using developed models, we have carried out a comparison study with a dedicated, point-to-point access architecture and demonstrated the benets of the shared access

A research framework for the clean-slate design of next-generation optical access

Abstract: We report the current status of our work on a new research framework for the clean-slate design of next-generation optical access (NGOA) architectures and protocols. The proposed research framework consists of two major components: A comparative analysis framework and a virtual test bed. The comparative analysis framework is based on a multivariate non-inferiority testing procedure and a notion of equivalent circuit rate (ECR); it is capable of statistically comparing multiple performance measures in an integrated way and providing quantification of the effective bandwidth for users of a candidate system with respect to a reference one based on user-perceived performances. The virtual test bed is implemented as simulation models of candidate architectures and protocols together with supporting environments providing a complete experimental platform for the comparative analysis. We review the current implementation of the virtual test bed based on OMNeT++/INET simulation framework and discuss the issues and challenges we met during initial studies together with plans and strategies to address them in the next version. To demonstrate the capability of the proposed research framework, we present preliminary results from an ongoing study of the elasticity of NGOA architectures, which show that the hybrid TDM/WDM-PON can manage the same user-perceived performances as those of the dedicated point-to-point architecture with the same line rate by varying the number of tunable transceivers for a wide range of traffic load.