Patent ID: 9125140
Filing Date: 2015-09-01
Classification: H04W,Y02D

Abstract:
1. A method for an unconnected device to perform Wireless Local Area Network (WLAN) background scanning, comprising steps of: (a) setting tpo, a duration the unconnected device is in sleep mode with power consumption PO; (b) scanning for one or more possible local WLAN Access Points (APs); (c) when either a packet or higher energy is detected during the scanning of step (b), changing scanning parameters comprising decreasing the tpo, widening bandwidth of one or more receiver filters, if previously scanning is in passive mode, switching to active mode, if previously scanning is in active mode, changing transmit power, and changing response expiration time, and continuing scanning using the changed scanning parameters; and (d) when neither a packet nor higher energy are detected during the scanning of step (b), entering sleep mode for the duration tpo, and, at the end of the duration tpo, returning to step (b), and, if neither a packet nor higher energy are detected during a subsequent scanning of step (b), entering sleep mode for the duration tpo without changing the duration tpo.