公开(公告)号：US10264602B2

公开(公告)日：2019-04-16

申请号：US15099055

申请日：2016-04-14

Applicant: Apple Inc.

Inventor： Guoqing Li ,  Joonsuk Kim ,  Christiaan A. Hartman ,  Syed Aon Mujtaba ,  Chiu Ngok E. Wong ,  Yong Liu ,  Su Khiong Yong

IPC: H04L5/00 ,  H04W74/00 ,  H04W74/08

Abstract: Embodiments include a method, computer program product, and system for grouping electronic devices into contention groups to reduce uplink Orthogonal Frequency-Division Multiple Access (OFDMA) random access (OFDMA-RA) collisions. An access point may explicitly assign an electronic device to a contention group, or the electronic device may implicitly determine an assignment to the contention group. To explicitly assign a device to a contention group, the access point may randomly assign or assign based on a criteria of the electronic device. Examples of criteria include an association identifier (AID), a traffic type/quality of service (QoS) category, a power saving preference, and an association status. The electronic device may implicitly determine a contention group assignment based on the total number of contention groups. The electronic device may use the explicitly or implicitly assigned contention group number to determine whether the electronic device may contend for a given trigger frame random access (TF-R) frame.

公开(公告)号：US20180302854A1

公开(公告)日：2018-10-18

申请号：US16012969

申请日：2018-06-20

Applicant: APPLE INC.

Inventor： Harish Ramamurthy ,  Joonsuk Kim ,  Yong Liu ,  Christopher Hansen

IPC: H04W52/02 ,  H04W84/12 ,  H04W88/08

Abstract: A station, a method performed by a station and a corresponding method performed by an access point (AP) of a network to allow the station to operate a wireless local area network (WLAN) radio in a sleep state until the WLAN radio is ready to receive a beacon from the AP. The station includes a low power (LP) radio configured to receive a wake up signal from an AP of a network to which the station is connected. The station further includes a WLAN radio configured to operate in a sleep state until the WLAN radio receives an indication from the LP radio that the wakeup signal has been received, wherein WLAN radio is further configured to operate in a fully awake state after receipt of the indication to receive a beacon from the AP indicating a data transmission is pending for the station.

公开(公告)号：US10104573B2

公开(公告)日：2018-10-16

申请号：US14790882

申请日：2015-07-02

Applicant: Apple Inc.

Inventor： Yuchul Kim ,  Joonsuk Kim

IPC: H04W72/04 ,  H04W28/02 ,  H04W24/02 ,  H04W24/04 ,  H04W88/08

Abstract: This disclosure relates to estimating throughput of wireless networks by a wireless device. According to some embodiments, estimated uplink and downlink actual temporal load available to a wireless device in a wireless network may be determined. An uplink data rate and a downlink data rate of the wireless device in the wireless network may be estimated. Based on the estimated uplink and downlink actual temporal load available to the wireless device and the estimated uplink and downlink data rates of the wireless device, the maximum possible uplink throughput and downlink throughput of the wireless device in the wireless network may be estimated. Such throughput estimates may be used to select a wireless network to join from among multiple available wireless networks or to select an initial data rate for an application executing on the wireless device, among possible uses.

公开(公告)号：US10027455B2

公开(公告)日：2018-07-17

申请号：US14989945

申请日：2016-01-07

Applicant: Apple Inc.

Inventor： Joonsuk Kim ,  Yuchul Kim

IPC: H04W72/04 ,  H04L5/00 ,  H04W56/00 ,  H04L25/02 ,  H04L1/12 ,  H04L27/26 ,  H04W84/12

Abstract: This disclosure relates to orthogonal frequency division multiple access (OFDMA) communication in wireless local area networks (WLANs). According to some embodiments, a downlink OFDMA frame may be transmitted. An uplink OFDMA frame including acknowledgements associated with the downlink OFDMA frame may be received. The uplink OFDMA frame may be processed, in some instances including determining which devices receiving the downlink OFDMA frame transmitted an acknowledgement associated with the downlink OFDMA frame in the uplink OFDMA frame.

公开(公告)号：US10021650B2

公开(公告)日：2018-07-10

申请号：US15418854

申请日：2017-01-30

Applicant: Apple Inc.

Inventor： Chiu Ngok E. Wong ,  Christiaan A. Hartman ,  Joonsuk Kim ,  Syed Aon Mujtaba ,  Yong Liu ,  Su Khiong Yong

IPC: H04W52/02 ,  H04W40/00 ,  H04W40/24 ,  H04L12/931 ,  H04L29/06 ,  H04W84/12 ,  H04L29/08 ,  H04L1/00

CPC classification number: H04W52/0274 ,  H04L1/0003 ,  H04L49/201 ,  H04L69/22 ,  H04L69/323 ,  H04W40/005 ,  H04W40/244 ,  H04W52/0209 ,  H04W52/0225 ,  H04W84/12 ,  H04W88/02 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/26

Abstract: Embodiments described herein relate to providing reduced power consumption in wireless communication systems, such as 802.11 WLAN systems. Timing information regarding power save opportunities (PSOPs) may be provided in communication frames, which may inform mobile devices of expected frame exchange periods during which they may transition to a Doze state. Additional PSOP information may be included in beacon frames, which may inform mobile devices of expected multicast periods during which they may transition to a Doze state. This may operate to provide improvements in terms of power consumption.

公开(公告)号：US09883418B2

公开(公告)日：2018-01-30

申请号：US14747129

申请日：2015-06-23

Applicant: Apple Inc.

Inventor： Yuchul Kim ,  Joonsuk Kim

IPC: H04W4/00 ,  H04W28/02 ,  H04W48/18 ,  H04L12/26

CPC classification number: H04W28/0236 ,  H04L43/0888 ,  H04L43/0894 ,  H04W24/08 ,  H04W28/0231 ,  H04W48/18

Abstract: This disclosure relates to determining load and estimating throughput of wireless networks by a wireless device. According to some embodiments, the numbers of active downlink and uplink nodes in a wireless network may be determined. Channel utilization of the wireless network may also be determined. An uplink data rate and a downlink data rate of the wireless device in the wireless network may be estimated. Based on the numbers of active downlink and uplink nodes, channel utilization, and the uplink data rate and a downlink data rate of the wireless device, the maximum possible uplink throughput and downlink throughput of the wireless device in the wireless network may be estimated. Such throughput estimates may be used to select a wireless network to join from among multiple available wireless networks.

公开(公告)号：US20170126364A1

公开(公告)日：2017-05-04

申请号：US15341301

申请日：2016-11-02

Applicant: Apple Inc.

Inventor： Yuchul Kim ,  Joonsuk Kim

IPC: H04L1/18 ,  H04W28/04 ,  H04L12/741

Abstract: This disclosure relates to performing retransmissions in a wireless communication system by a wireless device. A wireless device may receive a first transmission of a data frame according to a wireless communication technology. The wireless device may attempt to decode the data frame. It may be determined that attempting to decode the data frame is unsuccessful. A retransmission of the data frame may be received at a retransmission interval after the first transmission of the data frame. The retransmission interval may be less than a minimum interframe interval for contending for medium access for new transmissions according to the wireless communication technology.

公开(公告)号：US09628361B2

公开(公告)日：2017-04-18

申请号：US14626218

申请日：2015-02-19

Applicant: Apple Inc.

Inventor： Youngjae Kim ,  Joonsuk Kim

IPC: H04L12/26 ,  H04L29/06 ,  H04W4/16 ,  H04W24/08 ,  H04W74/08 ,  H04W84/12

CPC classification number: H04L43/0876 ,  H04L65/1069 ,  H04W4/16 ,  H04W24/08 ,  H04W74/085 ,  H04W84/12

Abstract: This disclosure relates to wireless communication techniques for high short packet density scenarios. According to some embodiments, a wireless device may determine whether a wireless medium is experiencing crowded short packet conditions during a first period of time. The wireless device may select an operational mode from at least a first operational mode and a second operational mode based at least in part on whether the wireless medium is experiencing crowded short packet conditions. The wireless device may perform wireless communication on the wireless medium according to the selected operational mode.

公开(公告)号：US09622147B2

公开(公告)日：2017-04-11

申请号：US14483855

申请日：2014-09-11

Applicant: APPLE INC.

Inventor： Joonsuk Kim ,  Yuchul Kim ,  Syed A. Mujtaba

IPC: H04W40/22 ,  H04L1/18 ,  H04L12/721 ,  H04W24/08 ,  H04W84/12 ,  H04L1/00

CPC classification number: H04W40/22 ,  H04L1/0061 ,  H04L1/1845 ,  H04L1/1864 ,  H04L1/189 ,  H04L45/70 ,  H04W24/08 ,  H04W84/12

Abstract: A method and device for decoding packets received via a wireless local area network. The method performed by the device including receiving a packet, the packet including a signal portion and a data portion, verifying the signal portion of the packet is valid, determining if the packet is destined for the device, determining if the packet is a retransmission, combining, when the packet is a retransmission, information from the data portion of the packet with stored information from a previously received packet having a data portion that was not successfully decoded and attempting to decode the packet based at least in part on the information and stored information.

公开(公告)号：US09603092B2

公开(公告)日：2017-03-21

申请号：US14138659

申请日：2013-12-23

Applicant: Apple Inc.

Inventor： Joonsuk Kim ,  Syed A. Mujtaba ,  Xiaowen Wang

IPC: H04L12/28 ,  H04L12/56 ,  H04W52/02

CPC classification number: H04W52/0238 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144

Abstract: In order to reduce power consumption of an electronic device during communication with another electronic device in a wireless local area network (WLAN), the electronic device analyzes fields in a given packet prior to a payload of the given packet to look for information that specifies a destination of the given packet. For example, the information may include: a full associated identification (AID) of the destination, a partial media-access-control (MAC) address of the destination; and/or a compressed (MAC) address of the destination. The information may be included in the preamble of the given packet. In particular, the information may replace length information in a high-throughput signal field in the given packet. Moreover, if the destination is other than the electronic device, the electronic device dumps the given packet and changes a power state of the electronic device, thereby reducing the power consumption.