A system comprises a wireless master unit and one or more wireless slave units, each having a unique identifier. When a wireless slave unit is active, it is addressed by one of a limited number of temporary addresses. A PARK mode enables a wireless slave unit to be in an idle state during which its temporary...http://www.google.com/patents/US6570857?utm_source=gb-gplus-sharePatent US6570857 - Central multiple access control for frequency hopping radio networks
