A first device communicates with a wireless network that includes nodes that are active for predefined activation times and that are at least partially dormant when not active. The communication method includes identifying a start of communication via a message that exceeds a maximum activation time...http://www.google.com.hk/patents/US20060285579?utm_source=gb-gplus-share專利 US20060285579 - Communicating over a wireless network
