Cross-layer optimization in wireless data networks

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Data networks such as the Internet have traditionally been designed in a layered fashion where each layer communicates only with the layers directly above and below it through predefined interfaces. A layered architecture has also been implemented for wireless networks mainly because of inter-operability issues with legacy wireline networks. However, it is well known that such a layered design may not be appropriate for wireless networks due to the specific characteristics of wireless medium, i.e. high error rate and large rate variability, which can negatively impact higher layer network protocols. In particular, it has been suggested that some interactions across different protocol layers can significantly improve the performance of wireless systems.