公开(公告)号：US11903027B2

公开(公告)日：2024-02-13

申请号：US17697778

申请日：2022-03-17

Applicant: Apple Inc.

Inventor： Sarvesh Kumar Varatharajan ,  Arun Vijayakumari Mahasenan ,  Venkateswara Rao Manepalli ,  Won Soo Kim ,  Yaranama Venkata Ramana Dass ,  Giri Prassad Deivasigamani ,  Anil G Naik ,  Piyush Kumar Upadhyay

IPC: H04W74/08

CPC classification number: H04W74/0816

Abstract: The present disclosure relates to several techniques for reducing the occurrence of data collisions, which can occur when multiple devices simultaneously transmit data in the same (frequency) channel. For example, a turnaround time in which a device switches from a receive mode of operation to a transmit mode of operation may be reduced based on the device and another device indicating that they are capable of operating with a reduced turnaround. As another example, devices may use learning-based turnaround estimation to determine a turnaround time supported by other devices and utilize the determined turnaround time, for instance, instead of a longer turnaround time. As yet another example, multiple clear channel assessments may be performed before transmitting data. For instance, a first clear channel assessment may be performed during a backoff period, and a second clear channel assessment may be performed afterwards before data is transmitted.

公开(公告)号：US11510245B2

公开(公告)日：2022-11-22

申请号：US17239339

申请日：2021-04-23

Applicant: Apple Inc.

Inventor： Yaranama Venkata Ramana Dass ,  Assaf Porat ,  Oren Shani ,  Venkateswara Rao Manepalli ,  Paul V. Flynn

IPC: H04W74/08 ,  H04W84/18 ,  G16Y40/10 ,  G16Y10/75

Abstract: An approach is described for a wireless device comprising a transceiver and a processor communicatively coupled to the transceiver. The processor is configured to detect a packet for transmission; scan, using the transceiver, a channel during an initial sliding window, the initial sliding window having N symbol durations; determine a power distribution of the initial sliding window based on the channel scan; determine that the channel is occupied during a first time period of the initial sliding window based at least on the power distribution; and determine a second sliding window having a second time period and a third time period. The second time period overlaps with the initial sliding window and a length of the third time period is determined based at least on the power distribution. The processor is further configured to scan, using the transceiver, the channel during the third time period; determine that the channel is idle during the third time period of the second sliding window; and transmit, using the transceiver, the packet to a second wireless device on the channel responsive to the third time period being idle.

公开(公告)号：US11147046B2

公开(公告)日：2021-10-12

申请号：US16542358

申请日：2019-08-16

Applicant: Apple Inc.

Inventor： Guoqing Li ,  Yang Yu ,  Paul V. Flynn ,  Yaranama Venkata Ramana Dass ,  Vijay Kumar Ramamurthi ,  Camille Chen ,  Rajneesh Kumar

IPC: H04W72/04

Abstract: An interface circuit in an electronic device (such as an access point) may request a channel status in order to specify a subset of one or more frequency sub-bands. During operation, the interface circuit may provide at least a frame to the recipient electronic device, where the frame requests the channel status for the one or more frequency sub-bands. Then, the electronic device may receive one or more measurement results from the recipient electronic device that specify the subset of the one or more frequency sub-bands (such as one or more RUs) that are not to be used when communicating with the recipient electronic device.

公开(公告)号：US20200288496A1

公开(公告)日：2020-09-10

申请号：US16804169

申请日：2020-02-28

Applicant: Apple Inc.

Inventor： Guoqing Li ,  Vijay Kumar Ramamurthi ,  Yaranama Venkata Ramana Dass ,  Ding Li

IPC: H04W72/12 ,  H04B7/0452 ,  H04L5/00 ,  H04W72/04

Abstract: An electronic device that selectively provides a trigger frame is described. During operation, the electronic device may receive a frame from a recipient electronic device, where the frame includes information that specifies a maximum uplink multi-user transmit duration of the recipient electronic device. Moreover, the electronic device may selectively provide the trigger frame to the recipient electronic device that specifies an uplink OFDMA frame or an uplink MIMO frame associated with the recipient electronic device. The trigger frame may be selectively provided when a transmit time corresponding to the uplink OFDMA frame or the uplink MIMO frame is less than or equal to the maximum uplink multi-user transmit duration.

公开(公告)号：US20200288437A1

公开(公告)日：2020-09-10

申请号：US16542358

申请日：2019-08-16

Applicant: Apple Inc.

Inventor： Guoqing Li ,  Yang Yu ,  Paul V. Flynn ,  Yaranama Venkata Ramana Dass ,  Vijay Kumar Ramamurthi ,  Camille Chen ,  Rajneesh Kumar

IPC: H04W72/04

Abstract: An interface circuit in an electronic device (such as an access point) may request a channel status in order to specify a subset of one or more frequency sub-bands. During operation, the interface circuit may provide at least a frame to the recipient electronic device, where the frame requests the channel status for the one or more frequency sub-bands. Then, the electronic device may receive one or more measurement results from the recipient electronic device that specify the subset of the one or more frequency sub-bands (such as one or more RUs) that are not to be used when communicating with the recipient electronic device.