A method of forming an ad hoc hierarchical communication network involves associating a plurality of wireless transceivers with articles, and assigning to each of the transceivers a class designation representative of a characteristic or behavior of the article with which the transceiver is associated....http://www.google.com.hk/patents/US20020119770?utm_source=gb-gplus-share專利 US20020119770 - Class switched networks for tracking articles
