“Four disruptive technologies are emerging that promise to render not only the next wave of so-called 3G wireless networks irrelevant, but possibly even their 4G successors.”

: “…(T)he parlous state of the wireless-telecoms industry, and the difficulties surrounding the deployment of “third generation” (3G) networks in particular, could be taken as evidence that existing ways of doing things are reaching their limits, and that some radical new ideas are needed.

Here, then, are four emerging technologies that show much promise: smart antennas, mesh networks, ad hoc architectures, and ultra-wideband transmission. Smart antennas are already in use and mesh networks are starting to appear, while ad hoc architectures and ultra-wideband are still largely restricted to the laboratory. But each challenges existing ways of doing things; each, on its own, or in combination with others, could shake up the wireless world. The Economist