Applied Communication science ACS

United States

Applied Communication science ACS

United States

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Sultan F.,Applied Communication science ACS | Poylisher A.,Applied Communication science ACS | Serban C.,Applied Communication science ACS | John Lee R.C.,Applied Communication science ACS | And 5 more authors.
Proceedings - IEEE Military Communications Conference MILCOM | Year: 2012

Hybrid network emulation (HNE) comprises a discrete event simulated network and virtual machines that send and receive traffic through the simulated network. It allows testing network applications rather than their models on simulated target networks, particularly mobile wireless networks. Scalability of this test approach is hindered by the time divergence problem: for complex, large-scale simulations, discrete event simulation time advances slower than real time, distorting packet propagation characteristics. To address this problem, we developed TimeSync, a system that uses discrete event simulation time to control and synchronize time advance on virtual machines for large-scale hybrid network emulation. In this paper, we describe how TimeSync controls and synchronizes time perception in hybrid network emulation between simulator and virtual machines, and present experimental results. © 2012 IEEE.


Lee J.,Applied Communication science ACS . | Kant L.,Applied Communication science ACS . | McAuley A.,Applied Communication science ACS . | Sinkar K.,Applied Communication science ACS . | And 2 more authors.
Proceedings - IEEE Military Communications Conference MILCOM | Year: 2012

Design and planning Military networks requires complex cost-performance trades involving several functions ranging from subnet creation, topology generation, routing hierarchy design & protocol choice, waveform and frequency planning and MAC choices. In this paper we focus on a subset of the design problems pertaining to routing architecture design with unit task organization (UTO) requirements that are critical to military networks. As illustrated in this paper, the choice of routing architecture includes choice of subnets, routing areas and gateways involves complex cost-performance trades. To this end we use a MANET network design toolset Cognitive Network Engineering Design Analytic Toolset (CNEDAT) [1], which is an outcome of a joint project between ACS and US Army CERDEC. CNEDAT is an analytic design tool with a rich set of analytical models for algorithms and protocols for heterogeneous, multi-tier Military Networks. CNEDAT can be used both to: (a) generate/synthesize alternative network designs/plans given a set of network resources, objectives and constraints, by orchestrating various combinations of Waveform, MAC, and network algorithms & protocols, and (b) analyze the resulting network performance to provide options for suitable network stacks and architectures to meet mission objectives. We present in this paper, planning and design of routing architectures that greatly impact network performance and thus play a major decision role while designing and deploying military networks. © 2012 IEEE.

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