Patent ID: 6047200
Filing Date: 2000-04-04
Classification: H04B,H04L,H04W,Y02D

Abstract:
A remote unit for a personal wireless area network comprising:a receiver;an AC power supply coupled to the receiver and supplying power to the receiver;a battery-backup power supply coupled to the receiver, the battery-backup power supply becoming operative to supply power to the receiver when the AC power supply fails; anda controller coupled to the receiver, the AC power supply and the battery-backup power supply, the controller detecting when the AC power supply fails and in response controls the receiver and the battery-backup power supply by invoking a sleep mode of operation, the sleep mode operation being periodically interrupted by the controller controlling the receiver and the battery-backup power supply to enter a standby mode of operation in which the receiver scans for a CONNECT message indicating an incoming call, the controller controlling the sleep mode and the standby mode of operations based on a frame count that is generated from an identification number of the remote unit.