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Cross-layer optimization offers the potential to achieve vast performance gains in wireless communications environments, and even more so in the context of one-to-many services because of the interdependencies among performances at receivers owing to congestion control and reliability requirements. This paper investigates some opportunities for cross-layer optimization involving the network layer. The first such solution, the dynamic selection of the one-to-many data transfer method based on cross-layer information, is shown to achieve considerable bandwidth gains for one-to-many services. The second solution, the cross-layer optimization of routing based on QoS demands, is characterized mathematically.
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