Cross-Layer Design: A New Paradigm

Deployment of wireless networks requires more efficient protocols and optimal architectures. A new approach which has been attended by the research communities is the cross-layer design (CLD) methodology. Recently, various architectures and models have been proposed by the CLD designers. So far, the work on CLD has focused on problem-based realization and modification of the traditional layered network architectures. In this paper, we review the current works on CLD and propose a new paradigm in CLD. Using the new paradigm; network designers have a solid and comprehensive roadmap for CLD. Unlike the existing CLD approaches, the new paradigm offers a problem-independent model categorizing CLD in four general styles: SSSD, SSMD, MSSD, and MSMD. This classification considers the number of sources and destinations contributing in cross-layer communications. In order to cover all possible CLD models, direct and indirect types is proposed for CLD that specify the cross-layer interactions. Consequently, using the new classifications the CLD concept can be better realized and standardized. Also, the designers would have been organized for new CLDs