認知無線電與認知網(wǎng)絡ch08認知網(wǎng)絡的跨層設計(存儲版)
【正文】 the ultimate CognitiveCrosslayer Architecture shall meet are modularity,interpretability, imprecision, scalability and plexity. CrossLayer—— breaking the traditional encapsulation of munication of protocal stack to enable a more effective optimization of the overall munication quality. Unfortunately, the current state of the art in wireless munication systems research is still quite far from an effective formulation of the ultimate Cognitive Crosslayer Architecture. In the last decade, crosslayer optimization strategies have been widely studied and adopted, but in most cases the aim was to achieve performance enhancements in specific scenarios. For instance, a vast number of those crosslayer solutions had the aim of improving the performance of a particular multimedia application or transport protocol over a given radio link such as or UMTS. In most cases these solutions cannot be reused for different wireless technologies or applications without a significant redesign effort. 2022/2/3 11/15 Challenges of Cognitive Crosslayering(2) ? Modularity: traditionally, protocol encapsulation has always been effective in providing modularity, ., in allowing independent implementation of all layers (., wireless interfaces, drivers, protocol stacks, applications). In the definition of a crosslayer framework, care should be taken in preserving the modularity of the architecture, in order to allow ponents with crosslayer capabilities to be designed independently of each other, and to be used interchangeably. Abstracting from the underlying technology is a key prerequisite to this concept of modularity. As an example, suppose we are designing a cognitive transport protocol implementation which can exploit link state information from the link layer to provide enhanced performance. If we can get the necessary information fr
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