"IP multimedia subsystem (IMS) and software-defined radio (SDR) also are important components of this outside-the-box thinking"
The only valid reason to have SDR is to keep up with revisions for wireless standards prematurely emerging from the laboratory, ...like WiMax. For battery-powered applications, the box is there for good reasons.
Speaking of...
"One of the reasons WiMAX has so many proponents is its potential to make substantial improvements at a fraction of the cost of deploying traditional cellular-based systems."
Ladies and Gentlemen, welcome to the American version of Tero Kuittinen.