The mobile station is in the sleep mode until just prior to a designated slot. Upon wakeup, the mobile station ensures a link is maintained with the network by measuring the strength of several pilots. If a neighbor pilot is stronger than the current pilot, a handoff is performed. After handoff, the...http://www.google.de/patents/US6973310?utm_source=gb-gplus-sharePatent US6973310 - Fast reacquisition after long sleep
