Patent ID: 8976721
Filing Date: 2015-03-10
Classification: H04W,Y02D

Abstract:
1. A system comprising: a clock generator configured to generate a first clock; a receiver configured to transition, based on the first clock, from a power save mode to an active mode to receive a delivery traffic indication message (DTIM) beacon from an access point, wherein the DTIM beacon is transmitted at a DTIM beacon interval based on a second clock associated with the access point; a beacon sensing module configured to determine a number of times the DTIM beacon is missed by the receiver during a predetermined time period subsequent to the receiver transitioning from the power save mode to the active mode due to the first clock not being synchronized to the second clock; a transmit module configured to transmit a number of requests to the access point during a given DTIM beacon interval, wherein the number of requests is based on the number of times the DTIM beacon is missed by the receiver during the predetermined time period; and a synchronization module configured to in response to the transmit module transmitting the requests during the given DTIM beacon interval, receive information about the second clock from the access point, and synchronize the first clock to the second clock based on the information received from the access point.