公开(公告)号：US20240380519A1

公开(公告)日：2024-11-14

申请号：US18658915

申请日：2024-05-08

Applicant: APPLE INC.

Inventor： Wook Bong LEE ,  Tianyu WU ,  Zhou LAN ,  Feng JIANG ,  Mohamed ABOUELSEOUD ,  Chitto GHOSH ,  Anuj BATRA ,  Yan ZHANG

IPC: H04L1/1607 ,  H04W84/12

Abstract: Some aspects of this disclosure include an apparatus, method, and computer program product for wireless local area network (WLAN) link adaptation for multi-user transmission. For example, a receiving device can receive a multi-user-physical layer (PHY) protocol data unit (MU-PPDU) including a preamble and a plurality of data portions. The preamble can include a PHY multi-user-block acknowledgement request (MU-BAR) frame indicating a frequency band for transmitting a trigger-based (TB)-PPDU. The receiving device can decode at least a portion of a first data portion of the and transmit the TB-PPDU including feedback (FB) data corresponding to the first data portion in the frequency band. Even if the decoding of the first data portion fails, the receiving device can use information in the PHY MU-BAR frame to transmit a TB-PPDU to the transmitting device that includes a negative acknowledgment (NACK) frame and a FB sequence number of the MU-PPDU.

公开(公告)号：US20240314621A1

公开(公告)日：2024-09-19

申请号：US18606226

申请日：2024-03-15

Applicant: Apple Inc.

Inventor： Wook Bong LEE ,  Anuj BATRA ,  Zhou LAN ,  Mohamed ABOUELSEOUD ,  Chitlo CHOSH

IPC: H04W28/02 ,  H04W72/1268 ,  H04W72/566 ,  H04W84/12

CPC classification number: H04W28/0236 ,  H04W72/1268 ,  H04W72/569 ,  H04W84/12

Abstract: Disclosed herein are apparatuses and a method for implementing latency reduction using preemption within a physical layer (PHY) protocol data unit (PDU) (PPDU). An embodiment operates by encoding a multi-user PPDU (MU-PPDU) for transmission, where, the MU-PPDU comprises a plurality of aggregated media access control (MAC) PDUs (A-MPDUs) addressed to respective non-low-latency stations (non-LL-STAs). Based on a determination that low-latency data addressed to a low-latency station (LL-STA) is available for transmission at a MAC layer of the AP, the embodiment then transmits a preemption-indicator signal to the LL-STA and at least one non-LL-STA. Further, the embodiment identifies an A-MPDU of the plurality of A-MPDUs that is scheduled for transmission over a resource unit (RU) designated for transmitting low-latency data. The embodiment then replaces at least one non-low-latency MPDUs (non-LL-MPDUs) associated with the A-MPDU with at least one low-latency MPDUs (LL-MPDUs) addressed to the LL-STA to generate an updated A-MPDU., where a first LL-MPDU of the plurality of LL-MPDUs is a multi-user block acknowledgment request (MU-BAR) frame associated with the LL-MPDUs. Finally, the embodiment transmits the updated A-MPDU consisting the at least one LL-MPDUs over the RU.

公开(公告)号：US20240015649A1

公开(公告)日：2024-01-11

申请号：US18219523

申请日：2023-07-07

Applicant: Apple Inc.

Inventor： Jarkko L. KNECKT ,  Mohamed ABOUELSEOUD ,  Oren SHANI ,  Anuj BATRA ,  Yoel BOGER ,  Yong LIU ,  Leonid EPSTEIN ,  Su Khiong YONG ,  Qi WANG ,  Zhou LAN ,  Tianyu WU ,  Akira YAMANAKA ,  Noam GINSBURG

IPC: H04W52/02 ,  H04W76/15

CPC classification number: H04W52/0216 ,  H04W76/15 ,  H04W84/12

Abstract: Some aspects include apparatuses and methods for implementing a target wake time (TWT) scheme (or technique) for multi-link wireless communication networks. For example, a multi-link device (MILD) includes a first station (STA) associated with a first link of a wireless network and configured to communicate with a second MLD over the first link using a multi-link target wake time (TWT) process. The MLD also includes a second STA associated with a second link of the wireless network and configured to communicate with the second MLD over the second link using the multi-link TWT process. The MLD further includes one or more processors communicatively coupled to the first and second STAs and configured to control the operations of the first and second STAs to perform the multi-link TWT process.

公开(公告)号：US20190273636A1

公开(公告)日：2019-09-05

申请号：US16291973

申请日：2019-03-04

Applicant: Apple Inc.

Inventor： Anuj BATRA ,  Joachim S. HAMMERSCHMIDT ,  Eren SASOGLU

IPC: H04L25/02 ,  H04L9/06 ,  H04L9/08 ,  G06F7/58 ,  H04L25/03 ,  H04B1/711 ,  H04B7/0413

Abstract: A secure training sequence (STS) is included in wireless packets communicated between electronic devices to assist with channel estimation and wireless ranging. The STS includes multiple STS segments generated based on outputs from a cryptographically secure pseudo-random number generator (CSPRNG), the STS segments being separated by guard intervals and formatted in accordance with an 802.15.4 data symbol format that uses burst position modulation (BPM) and binary phase shift keying (BPSK) to map bits from the CSPRNG to burst positions and pulse polarities for the STS symbols. Both a first electronic device, which generates the STS, and a second electronic device, which estimates a communication channel using the STS, have prior private knowledge of cryptographic keys required to generate a non-repetitive single-use pseudo-random (PR) sequence by the CSPRNG. The STS includes two burst position intervals per STS symbol and two possible burst positions within each burst position interval.

公开(公告)号：US20240380518A1

公开(公告)日：2024-11-14

申请号：US18658805

申请日：2024-05-08

Applicant: APPLE INC.

Inventor： Wook Bong LEE ,  Tianyu WU ,  Zhou LAN ,  Feng JIANG ,  Mohamed ABOUELSEOUD ,  Chitto GHOSH ,  Anuj BATRA

IPC: H04L1/1607 ,  H04W84/12

Abstract: Some aspects of this disclosure include an apparatus, method, and computer program product for wireless local area network (WLAN) link adaptation. Some aspects of this disclosure include fast feedback (FB) contents to improve WLAN link adaptation that can address the challenges of ultra-high reliability (UHR) wireless communications. Fast FB contents can include a feedback sequence number (FBSN) that identifies a reference packet and FB data corresponding to the receipt of the reference packet by the receiving device. The FB data can include link adaptation parameters corresponding to the receiving device that the transmitting device can use to adjust (e.g., adapt) subsequent transmissions to the same receiving device. Some aspects include an indicator that informs a receiving device whether to provide a Negative Acknowledgement (NACK) frame (e.g., control packets) with FB contents or not.