Dari IEEE Communication Magazine, November 2010
1. Spectrum Markets spectrum_markets
It is widely recognized that the centralized approach to spectrum management currently used in most countries has led to highly inefficient allocations. It is also recognized that more efficient allocations could be achieved through
spectrum markets; however, most discussions have so far focused on secondary markets, which are managed by licensees. Here we take a more expansive view, and discuss some challenges and implications of implementing extensive spectrum markets across locations, time, and diverse sets of applications. The discussion is motivated by
first examining the fundamental question: Is spectrum scarce or abundant? Given that spectrum is indeed scarce, and that spectrum property rights are appropriately defined, we speculate on the emergence of a two-tier market; the
upper tier consists of spectrum owners that trade spectrum assets analogous to land rights, and the lower tier consists of spot markets for limited duration rentals of spectrum assets from owners at particular locations. The changes such spectrum markets could bring to the provision of wireless services and wireless network design are discussed along with methods for addressing related interference management issues.
2. A Primer on Spatial Modeling and Analysis in Wireless Networks wireless_networks
The performance of wireless networks depends critically on their spatial configuration, because received signal power and interference depend critically on the distances between numerous transmitters and receivers. This is particularly
true in emerging network paradigms that may include femtocells, hotspots, relays, white space harvesters, and meshing approaches, which are often overlaid with traditional cellular networks. These heterogeneous approaches to
providing high-capacity network access are characterized by randomly located nodes, irregularly deployed infrastructure, and uncertain spatial configurations due to factors like mobility and unplanned user-installed access points. This major shift is just beginning, and it requires new design approaches that are robust to spatial randomness,
just as wireless links have long been designed to be robust to fading. The objective of this article is to illustrate the power of spatial models and analytical techniques in the design of wireless networks, and to provide an entry-level
3. Bio-Inspired Networking: From Theory to Practice bioinspired_networking
Bio-inspired networking techniques have been investigated since more than a decade. Findings in this field have fostered new developments in networking, especially in the most challenging domains such as handling large-scale networks, their dynamic nature, resource constraints, heterogeneity, unattended operation, and robustness.
Even though this new research area started with highly theoretical concepts, it can be seen that there is also practical impact. This article aims to give an overview to the general field of bioinspired networking, introducing the key concepts and methodologies. Selected examples that outline the capabilities and the practical relevance are discussed in more detail. The presented examples outline the activities of a new community working on bio-inspired networking solutions, which is converging and becomes visible in term of the provided astonishingly efficient solutions.