公开(公告)号：US10462792B2

公开(公告)日：2019-10-29

申请号：US15165424

申请日：2016-05-26

Applicant: APPLE INC.

Inventor： Xiaowen Wang ,  William Burchill ,  Dawei Zhang

IPC: H04W72/04 ,  H04B7/0413 ,  H04W4/02

Abstract: A method and a device for performing massive multiple-input and multiple-output (“MIMO”) operations with a user equipment (UE). The method and device receive signals from a UE within a coverage area of the device, determine a location of the UE within the coverage area and assign an operating frequency band to the UE for communication with the device, wherein the coverage area includes a plurality of regions and the operating frequency band assigned to the UE is based on the one of the regions corresponding to the location and transmit the operating frequency band assignment to the UE.

公开(公告)号：US10345435B2

公开(公告)日：2019-07-09

申请号：US16041874

申请日：2018-07-23

Applicant: Apple Inc.

Inventor： Syed Aon Mujtaba ,  Xiaowen Wang

IPC: H04W24/00 ,  G01S7/486 ,  H04W4/02 ,  H04L27/18 ,  G01S11/02 ,  G01S11/08 ,  H04L27/00 ,  H04L27/26 ,  G01S5/14 ,  G01S17/10 ,  H04L1/00 ,  H04L27/34 ,  H04W64/00

Abstract: Some embodiments relate to a waveform design for time-of-flight estimation in a wireless communication system. The waveform may include a number N of signal tones, wherein the number N of signal tones is greater than a number M of signal tones that the receiving wireless device is configured to decode. Upon receipt of the waveform, the receiving wireless device may store a timestamp which indicates a time of receipt of the waveform. The receiving wireless device may decode M of the N signal tones. For example, the receiving wireless device may decode the middle M signal tones of the N signal tones. One or more of the transmitting or receiving wireless devices may then estimate a distance between them based at least in part on the timestamp.

公开(公告)号：US20190007823A1

公开(公告)日：2019-01-03

申请号：US16125799

申请日：2018-09-10

Applicant: Apple Inc.

Inventor： Yuchul Kim ,  Xiaowen Wang ,  Tarik Tabet ,  Dawei Zhang ,  Syed Aon Mujtaba

IPC: H04W8/00 ,  H04W52/02 ,  H04W76/14

CPC classification number: H04W8/005 ,  H04W52/0241 ,  H04W76/14 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/26

Abstract: In some embodiments, a user equipment device (UE) implements a method for discovering the presence of neighboring UEs using an on-demand discovery signal transmission technique. This discovery process may be performed to enable the UEs to perform peer-to-peer communications with each other, wherein peer-to-peer communications is defined as direct communication between the UEs without involving a base station. The UE may be configured to transmit a discovery request signal when it has moved greater than a threshold amount since transmission of a prior discovery request signal. The discovery request signal causes one or more neighboring UEs to each transmit a discovery signal in response, and also causes the UE which generated the discovery request signal to transmit its own discovery signal. The received discovery signal from each of the neighboring UEs is useable to discover, or detect the presence of, these neighboring UEs.

公开(公告)号：US20180359704A1

公开(公告)日：2018-12-13

申请号：US15997497

申请日：2018-06-04

Applicant: Apple Inc.

Inventor： Guoqing Li ,  Yong Liu ,  Oren Shani ,  Xiaowen Wang ,  Christiaan A. Hartman ,  Matthew L. Semersky ,  Josef Peery ,  Yoel Boger ,  Tushar R. Shah ,  Rajneesh Kumar ,  Christian W. Mucke

IPC: H04W52/02

CPC classification number: H04W52/0219 ,  H04W4/06 ,  H04W52/0235 ,  H04W76/40 ,  H04W84/12

Abstract: An interface circuit in an electronic device (such as an access point) may provide a group wake-up packet to a group of recipient electronic devices in a set of recipient electronic devices. During operation, the interface circuit may select the group in the set of recipient electronic devices, where the group includes at least one of the recipient electronic devices. Then, the interface circuit may provide the group wake-up packet for the recipient electronic devices in the group with information that specifies that a subset of the recipient electronic devices in the group transition from a low-power mode. For example, the information may include a bitmap that specifies the subset and an identifier of the group. Note that the electronic device may dynamically define the group. Alternatively, the recipient electronic devices in the group may be static.

公开(公告)号：US10085144B2

公开(公告)日：2018-09-25

申请号：US14870763

申请日：2015-09-30

Applicant: Apple Inc.

Inventor： Yuchul Kim ,  Xiaowen Wang ,  Tarik Tabet ,  Dawei Zhang ,  Syed Aon Mujtaba

IPC: H04W8/06 ,  H04W76/14 ,  H04W8/00 ,  H04W52/02

CPC classification number: H04W8/005 ,  H04W52/0241 ,  H04W76/14 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/168 ,  Y02D70/26

Abstract: In some embodiments, a user equipment device (UE) implements a method for discovering the presence of neighboring UEs using an on-demand discovery signal transmission technique. This discovery process may be performed to enable the UEs to perform peer-to-peer communications with each other, wherein peer-to-peer communications is defined as direct communication between the UEs without involving a base station. The UE may be configured to transmit a discovery request signal when it has moved greater than a threshold amount since transmission of a prior discovery request signal. The discovery request signal causes one or more neighboring UEs to each transmit a discovery signal in response, and also causes the UE which generated the discovery request signal to transmit its own discovery signal. The received discovery signal from each of the neighboring UEs is useable to discover, or detect the presence of, these neighboring UEs.

公开(公告)号：US10034133B2

公开(公告)日：2018-07-24

申请号：US15218434

申请日：2016-07-25

Applicant: Apple Inc.

Inventor： Syed Aon Mujtaba ,  Xiaowen Wang

IPC: H04W24/00 ,  H04W4/02 ,  H04L27/18 ,  G01S11/02 ,  G01S11/08 ,  H04L27/00 ,  H04W64/00 ,  H04L27/26

Abstract: Some embodiments relate to a waveform design for time-of-flight estimation in a wireless communication system. The waveform may include a number N of signal tones, wherein the number N of signal tones is greater than a number M of signal tones that the receiving wireless device is configured to decode. Upon receipt of the waveform, the receiving wireless device may store a timestamp which indicates a time of receipt of the waveform. The receiving wireless device may decode M of the N signal tones. For example, the receiving wireless device may decode the middle M signal tones of the N signal tones. One or more of the transmitting or receiving wireless devices may then estimate a distance between them based at least in part on the timestamp.

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：US09838054B2

公开(公告)日：2017-12-05

申请号：US14727682

申请日：2015-06-01

Applicant: Apple Inc.

Inventor： Wen Zhao ,  Paul V. Flynn ,  William S. Burchill ,  Vinay R. Majjigi ,  Xiaowen Wang ,  Syed A. Mujtaba ,  Kee-Bong Song

IPC: H04B1/00 ,  H04B15/00 ,  H04B1/10 ,  H04W88/06 ,  H04W28/02 ,  H04L12/891 ,  H04L12/801 ,  H04L12/851 ,  H04L12/825 ,  H04B17/29 ,  H04W52/24 ,  H04W52/26 ,  H04W52/36 ,  H04W72/04

CPC classification number: H04B1/1081 ,  H04B17/29 ,  H04L47/14 ,  H04L47/24 ,  H04L47/25 ,  H04L47/41 ,  H04W28/0236 ,  H04W52/243 ,  H04W52/265 ,  H04W52/267 ,  H04W52/36 ,  H04W72/0413 ,  H04W88/06

Abstract: A method for facilitating in-device coexistence between wireless communication technologies on a wireless communication device is provided. The method can include transmitting data traffic from the wireless communication device via an aggressor wireless communication technology; determining occurrence of an in-device interference condition resulting from transmission of the data traffic via the aggressor wireless communication technology interfering with concurrent data reception by the wireless communication device via a victim wireless communication technology; and reducing a bit rate of the data traffic transmitted via the aggressor wireless communication technology in response to the in-device interference condition.

公开(公告)号：US09768825B2

公开(公告)日：2017-09-19

申请号：US14871756

申请日：2015-09-30

Applicant: Apple Inc.

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

IPC: H04B7/00 ,  H04B1/40 ,  H04B7/06 ,  H04B7/08 ,  H04W88/08 ,  H04W84/12

CPC classification number: H04B1/40 ,  H04B7/061 ,  H04B7/0817 ,  H04W84/12 ,  H04W88/08 ,  Y02D70/10

Abstract: Wireless communication devices (UEs) may include multiple receive (RX) chains and associated antennas, and at least one transmit (TX) chain co-located with one of the RX chains. The UE may track instant fading of the antenna gain(s) during reception of packets from an associated access point (AP) device to which the UE intends to transmit packets. The UE may also track long term antenna gain(s), using any packets received at the multiple RX chains within the UE. At a switching occasion, a decision is made by the UE whether to switch antennas. If the instant fading detection is based on packets received no later than a specified time period prior to the switching occasion, then the UE may make the switching decision based on the results of the instant fading tracking. Otherwise, the UE may make the switching decision based on the results of the long term antenna gain tracking.

公开(公告)号：US09763185B2

公开(公告)日：2017-09-12

申请号：US13766055

申请日：2013-02-13

Applicant: Apple Inc.

Inventor： Syed Aon Mujtaba ,  Youngjae Kim ,  Kee-Bong Song ,  Xiaowen Wang ,  Yuchul Kim

IPC: H04W52/02 ,  H04B7/08

CPC classification number: H04W52/0209 ,  H04B7/0871 ,  H04B7/0877 ,  H04W52/0238 ,  H04W52/0245 ,  Y02D70/1242 ,  Y02D70/1244 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/146 ,  Y02D70/24 ,  Y02D70/25 ,  Y02D70/444

Abstract: Methods and apparatus for adaptively adjusting receiver operation for e.g., power optimization. In one embodiment, operation during diversity operation is adaptively adjusted. Diversity techniques consume significantly more power than non-diversity operation. However, the performance gain from receiver diversity is not always predictable. Consequently, in one embodiment, a device evaluates the overall performance gain contributed by diversity operation and, where the performance gain is insignificant or inadequate, the device disables diversity operation. In one implementation, the device can operate in a static single antenna mode, a dynamic single antenna mode and a dynamic multiple antenna mode.