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Requirements and Architectural Analysis for Precedence capabilities in the Global Information Grid
Abstract
This paper is intended to provide a brief analysis of the U.S. Government's Department of Defense Precedence and Preemption (P&P) requirements for Precedence-Based Assured Service (PBAS) capabilities in the Global Information Grid (GIG), Precedence is the user’s indication of the importance of a message, and in voice networks the PBAS capabilities are implemented using Multilevel Precedence and Preemption (MLPP) so that the most important messages get through when either the called end-user is busy or the network is stressed. In the GIG, the PBAS capabilities must be extended to all applications beyond voice, and must be implemented in an IP-based Quality of Service architecture. Here we investigate the Quality of Service component of Assured Service (AS). This paper does not address the other two components of Assured Service, which are Quality of Protection (QoP) and Information Assurance (IA). The focus of this paper is on those requirements which would impact the architecture choices for an IP-based packet enterprise transport network, specifically the DoD Global Information Grid (GIG) converged IP transport network. Most existing discussions of Precedence and Preemption requirements are presented in the context of traditional circuit-based voice services.
This paper is unique in that it focuses on the requirements and architectural alternatives needed for the implementation of PBAS capabilities in a global enterprise IP based transport network, irrespective of the applications being transported. . This analysis discusses options and tradeoffs for architectures, engineering designs, and operational implementations based upon the requirements discussed that can be the basis for recommendations for supporting PBAS in the GIG.
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| Dr. B.S. Farroha is a Senior Systems Engineer/Architect at the Johns Hopkins University, Applied Physics Lab. He holds a B.S. Computer Engineering, M.S. EE and Ph.D. EE from the Florida Institute of Technology and an MBA from the Johns Hopkins University. His main role in JHU/APL is to provide technical consultation to the federal government and act as trusted agent to monitor contractor compliance and deliverables in the areas of Communications and Information Systems. He is also an assistant professor at the University of Maryland-UC and serves as a reviewer for the IEEE. He has over 20 years of commercial and government systems design, development and management. His current research interests are in areas of systems architecture and optimization, system of systems, QoS, mobile communications and heterogeneous networking. He holds multiple national and international publications. He is a member of the ACM, SPIE, and a Senior Member of the IEEE. |