公开(公告)号：US20170171819A1

公开(公告)日：2017-06-15

申请号：US15444043

申请日：2017-02-27

Applicant: Apple Inc.

Inventor： Ran IRONY ,  Ran KATZ ,  Alon PAYCHER

IPC: H04W52/02 ,  H04W76/02 ,  H04W56/00

CPC classification number: H04W52/0229 ,  H04W56/0015 ,  H04W76/10 ,  H04W84/12 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164

Abstract: In order to reduce the power consumption after a transmitting electronic device in a wireless network has been detected, a receiving electronic device calculates transmit times of subsequent beacons from the transmitting electronic device based on a clock drift of the transmitting electronic device and the beacon period. Then, the receiving electronic device receives the subsequent beacon by opening scan windows that encompass the calculated transmit times. However, because the transmit times are more predictable after the transmitting electronic device has been detected (and the clock drift of the transmitting electronic device is known to the receiving electronic device), the receiving electronic device can reduce the width of the scan windows. In addition, the transmitting electronic device can further reduce the power consumption by increasing the beacon period.

公开(公告)号：US20190104424A1

公开(公告)日：2019-04-04

申请号：US16146571

申请日：2018-09-28

Applicant: Apple Inc.

Inventor： Sriram HARIHARAN ,  Alon PAYCHER ,  Ran IRONY ,  Sreeraman ANANTHARAMAN ,  Robert D. SILFVAST

IPC: H04W24/02 ,  H04L5/00 ,  H04R3/12

Abstract: Methods and apparatus for communicating audio packets with ultra-low latency at high data rates from an audio source device to one or more audio output devices over a wireless personal area network (WPAN) connection, such as via a Bluetooth connection. Latency is reduced by using time-efficient audio coding and decoding, limited retransmissions, reduced time and frequency of acknowledgements, and by combining Bluetooth Classic (BTC) packets for downlink audio and downlink control with Bluetooth Low Energy (BTLE) packets for uplink control, uplink acknowledgements, and inter-device wireless communication. The number of retransmissions and packet concealments per frame cycle can be limited to an upper threshold number to satisfy a low latency requirement.

公开(公告)号：US20190104423A1

公开(公告)日：2019-04-04

申请号：US16146138

申请日：2018-09-28

Applicant: Apple Inc.

Inventor： Sriram HARIHARAN ,  Alon PAYCHER ,  Ran IRONY ,  Sreeraman ANANTHARAMAN ,  Robert D. SILFVAST

IPC: H04W24/02 ,  H04L12/26 ,  H04R3/12

Abstract: Methods and apparatus for communicating audio packets with ultra-low latency at high data rates from an audio source device to one or more audio output devices over a wireless personal area network (WPAN) connection, such as via a Bluetooth connection. Latency is reduced by using time-efficient audio coding and decoding, limited retransmissions, reduced time and frequency of acknowledgements, and by combining Bluetooth Classic (BTC) packets for downlink audio and downlink control with Bluetooth Low Energy (BTLE) packets for uplink control, uplink acknowledgements, and inter-device wireless communication. The number of retransmissions and packet concealments per frame cycle can be limited to an upper threshold number to satisfy a low latency requirement.