Low-cost intelligent control and communication devices are arranged to communicate with one another over one or more shared physical media, such as a powerline or a radio frequency band. No network controller is needed, because any device can act as a master, slave, or repeater. Adding more devices makes...http://www.google.de/patents/US7345998?utm_source=gb-gplus-sharePatent US7345998 - Mesh network of intelligent devices communicating via powerline and radio frequency
