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This paper describes a general approach to dealing with cross layer information in OMNeT++-based network simulations. Rather than prescribe a specific cross layer architecture, this work is intended to address the software engineering problem of passing information between simulation modules in a sound way. An XML-based mechanism for passing information between modules using OMNeT++'s controlInfo data structure is presented. Because XML is an intermediate format for the OMNeT++ NEtwork Description language (NED), it is further suggested that allowing NED files to be annotated with information about cross layer interactions will enhance readability and reuse-ability. A further goal of this paper is to initiate discussion and collaboration in the Swedish (and international) OMNeT++ community.
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