公开(公告)号：US10484150B2

公开(公告)日：2019-11-19

申请号：US15341301

申请日：2016-11-02

Applicant: Apple Inc.

Inventor： Yuchul Kim ,  Joonsuk Kim

IPC: H04L1/18 ,  H04L12/741 ,  H04W84/12

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：US20190239250A1

公开(公告)日：2019-08-01

申请号：US16383155

申请日：2019-04-12

Applicant: Apple Inc.

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

IPC: H04W74/00 ,  H04W74/08

CPC classification number: H04W74/006 ,  H04L5/0007 ,  H04W74/0833 ,  H04W74/085 ,  Y02D70/00 ,  Y02D70/142

Abstract: Some embodiments are directed to 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：US20190238285A1

公开(公告)日：2019-08-01

申请号：US16378718

申请日：2019-04-09

Applicant: Apple Inc.

Inventor： Joonsuk Kim ,  Guoqing Li

IPC: H04L5/00 ,  H04L1/00 ,  H04W4/08 ,  H04W28/20

CPC classification number: H04L5/0007 ,  H04L1/0003 ,  H04L1/0031 ,  H04L1/0061 ,  H04L1/0083 ,  H04L5/0053 ,  H04L5/0091 ,  H04L5/0094 ,  H04W4/08 ,  H04W28/20 ,  H04W72/042 ,  H04W80/00 ,  H04W84/12 ,  H04W88/02 ,  H04W88/08

Abstract: A wireless access point transmits a protocol data unit (PDU) that includes data and signaling for a plurality of user devices. The PDU spans a channel in frequency and an interval in time, and includes a first signaling section, a second signaling section and a traffic action. For each of a plurality of subchannels of the channel: the first signaling section includes (within the subchannel) a corresponding redundant copy of common signaling information for the user devices associated with the access point; the second signaling section includes (within the subchannel) a corresponding set of user-specific signaling information for a corresponding group of one or more of the user devices; and the traffic section includes (within the subchannel) a corresponding set of traffic data for the corresponding group of one or more user devices. Subchannels sizes may be configurable. A signaling set CRC may be included per subchannel.

公开(公告)号：US10313226B2

公开(公告)日：2019-06-04

申请号：US15256013

申请日：2016-09-02

Applicant: Apple Inc.

Inventor： Guoqing Li ,  Yong Liu ,  Joonsuk Kim ,  Christiaan A. Hartman ,  Su Khiong Yong ,  Syed A. Mujtaba ,  Matthew L. Semersky

IPC: H04L12/18 ,  H04W76/40 ,  H04L12/761 ,  H04L29/12 ,  H04W4/06

Abstract: Disclosed herein are system, method, and computer program product embodiments for selectively decoding a multicast subframe in a multi-user frame for a wireless communications protocol. Embodiments include transmitting a request frame including a multicast group address for a multicast group to an access point (AP). The AP can determine a multicast identifier for the multicast group based on the multicast group address in the request frame. The AP can also transmit a response frame including the determined multicast identifier to a station (STA). The STA can receive a multi-user frame containing a multicast subframe from the AP. The STA can determine whether the multicast subframe is destined for the STA based on the determined multicast identifier and a multicast identifier stored in a preamble of the multi-user frame. The STA can determine whether to decode the multicast subframe based on the determination of whether the multicast subframe is destined for the STA.

公开(公告)号：US10285200B2

公开(公告)日：2019-05-07

申请号：US15403092

申请日：2017-01-10

Applicant: Apple Inc.

Inventor： Guoqing Li ,  Christiaan A. Hartman ,  Ashok Ranganath ,  Joonsuk Kim ,  Matthew L. Semersky ,  Oren Shani ,  Su Khiong Yong ,  Yong Liu

IPC: H04W74/02 ,  H04W84/12 ,  H04W74/00

Abstract: An access point selects a channel access policy for an electronic device in a wireless local area network (WLAN). During operation, an interface circuit of the access point receives a channel access preference from the electronic device. The channel access preference includes: a multi-user trigger-based channel access technique, a single-user contention-based channel access technique, or both. The interface circuit selects the channel access policy for the electronic device based, at least in part, on the received channel access preference. The channel access policy can also be selected based at least in part on a communication performance metric associated with communication in the WLAN. The interface circuit communicates the selected channel access policy to the electronic device, which subsequently accesses a communication channel and communicates packets with the access point in accordance with the channel access policy.

公开(公告)号：US10206173B2

公开(公告)日：2019-02-12

申请号：US15592355

申请日：2017-05-11

Applicant: Apple Inc.

Inventor： Syed Aon Mujtaba ,  Joonsuk Kim

IPC: G08C17/00 ,  H04W52/02 ,  H04W28/02 ,  H04W84/12

Abstract: This disclosure relates to low energy communication techniques. According to some embodiments, a wireless transmission may be received by a wireless device. The wireless transmission may include a physical layer (PHY) preamble and PHY data. The PHY preamble may include destination information indicating a destination and length information indicating a length (or duration) of the wireless transmission. The destination and length information may be included prior to a portion of the PHY preamble configured for channel estimation. The wireless device may determine whether the wireless transmission is destined to the wireless device based on the destination information. If the wireless transmission is not destined to the wireless device, the wireless device may drop a remainder of the wireless transmission.

公开(公告)号：US20180294936A1

公开(公告)日：2018-10-11

申请号：US16008880

申请日：2018-06-14

Applicant: Apple Inc.

Inventor： Joonsuk Kim ,  Yuchul Kim

IPC: H04L5/00 ,  H04L27/26 ,  H04L1/18 ,  H04W56/00 ,  H04L1/12 ,  H04L25/02 ,  H04W84/12

CPC classification number: H04L5/0048 ,  H04L1/12 ,  H04L1/1854 ,  H04L5/0023 ,  H04L25/0202 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2675 ,  H04W56/002 ,  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：US10020862B2

公开(公告)日：2018-07-10

申请号：US14871794

申请日：2015-09-30

Applicant: Apple Inc.

Inventor： Xiaowen Wang ,  Vinay R. Majjigi ,  Joonsuk Kim ,  Syed Aon Mujtaba

IPC: H04B7/08 ,  H04B17/12 ,  H04B17/318 ,  H04B7/0413

CPC classification number: H04B7/0817 ,  H04B7/0413 ,  H04B7/0877 ,  H04B17/12 ,  H04B17/318 ,  Y02D70/00 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/168 ,  Y02D70/26 ,  Y02D70/444

Abstract: Wireless communication devices with multiple receive (RX) chains may be operated to maintain high performance while saving power. This may be accomplished by evaluating signal strength during transmission of the RX packets, and/or evaluating a possible imbalance (gain difference) between the multiple RX chains within the wireless communication device. Signal strength (or good signal) detection may be enabled when non-MIMO (non-multiple-in-multiple-out) transmissions are taking place, while imbalance detection (antenna gain comparison) may be enabled when a specified number of single-stream packets have been received. Once the decision has been made to operate in a reduced number RX path mode, decision to reactivate one or more additional RX paths may be made based on MIMO detection, a detection of a drop in signal quality, and/or upon expiration of a power save timer.

公开(公告)号：US10015741B2

公开(公告)日：2018-07-03

申请号：US14502811

申请日：2014-09-30

Applicant: APPLE INC.

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

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

CPC classification number: H04W52/0212 ,  H04W52/0216 ,  H04W52/0229 ,  H04W52/0235 ,  H04W52/028 ,  H04W84/12 ,  H04W88/08 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/22

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：US09942015B2

公开(公告)日：2018-04-10

申请号：US14989924

申请日：2016-01-07

Applicant: Apple Inc.

Inventor： Joonsuk Kim ,  Guoqing Li ,  Chiu Ngok E. Wong

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

CPC classification number: H04L5/0048 ,  H04L1/12 ,  H04L1/1854 ,  H04L5/0023 ,  H04L25/0202 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2675 ,  H04W56/002 ,  H04W84/12

Abstract: This disclosure relates to orthogonal frequency division multiple access (OFDMA) communication in wireless local area networks (WLANs). According to some embodiments, an indication may be transmitted to receiving devices that a first frame is an OFDMA frame. Channel information indicating allocation of bandwidth portions of the first frame to respective receiving devices may also be transmitted to the receiving devices. The first frame may be transmitted to the receiving devices, including transmitting data to each respective receiving device on the bandwidth portion(s) allocated to the respective receiving device.