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    SYSTEMS AND METHODS FOR COLLISION RESOLUTION IN A WIFI OFDMA SYSTEM
    21.
    发明申请
    SYSTEMS AND METHODS FOR COLLISION RESOLUTION IN A WIFI OFDMA SYSTEM 有权

    公开(公告)号：US20220330344A1

    公开(公告)日：2022-10-13

    申请号：US17608789

    申请日：2020-05-04

    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

    Inventor： Hanqing Lou ,  Alphan Sahin ,  Li Hsiang Sun ,  Xiaofei Wang ,  Rui Yang ,  Frank La Sita

    IPC: H04W74/08 ,  H04L5/00 ,  H04L27/26 ,  H04L1/18

    Abstract: Methods and system may be used for collision detection for orthogonal frequency division multiple access (OFDMA)-based random access. A wireless transmit/receive unit (WTRU) may receive, from an access point (AP), a first trigger frame triggering random access using OFDMA. The WTRU may transmit, to the AP, in response to the first trigger frame a trigger-based frame including user specific control information in a signal (SIG) field. The WTRU may receive an acknowledgment/negative acknowledgment (ACK/NAK) message indicating that the trigger-based frame was successfully detected at the AP or that the trigger-based frame was not successfully detected at the AP. The WTRU receive, from the AP, a scheduling retransmission frame including rescheduling information for STAs with corrupted UL transmissions. On a condition that the scheduling retransmission frame indicates that a collision of the trigger-based frame was detected, the WTRU may retransmit the trigger-based frame

    METHODS AND APPARATUS FOR MIMO TRANSMISSION
    22.
    发明申请
    METHODS AND APPARATUS FOR MIMO TRANSMISSION 有权

    公开(公告)号：US20220294515A1

    公开(公告)日：2022-09-15

    申请号：US17828984

    申请日：2022-05-31

    Applicant: InterDigital Patent Holdings, Inc.

    Inventor： Oghenekome Oteri ,  Alphan Sahin ,  Hanqing Lou ,  Li-Hsiang Sun ,  Rui Yang

    IPC: H04B7/06 ,  H04B7/0452 ,  H04W74/08

    Abstract: Methods for multiple input-multiple output (MIMO) transmission are provided herein. A method may include sensing, using at least one of a plurality of antenna chains, radio frequency (RF) energy on a channel in a first time duration and may indicate the channel is busy. RF energy may be sensed on the channel using the at least one of the plurality of antenna chains in a second time duration and may indicate the channel is not busy. A method may include sending energy level sensed during the second time duration, a frame using the at least one of the plurality of antenna chains. The frame may indicate timing information associated with a MIMO transmission. The MIMO transmission may be sent using the indicated timing information and the at least one of the plurality of antenna chains.

    METHODS FOR SUPPORTING BSS EDGE USER TRANSMISSIONS
    23.
    发明申请
    METHODS FOR SUPPORTING BSS EDGE USER TRANSMISSIONS 有权

    公开(公告)号：US20220217770A1

    公开(公告)日：2022-07-07

    申请号：US17610343

    申请日：2020-05-08

    Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

    Inventor： Li Hsiang Sun ,  Hanqing Lou ,  Alphan Sahin ,  Xiaofei Wang ,  Rui Yang ,  Frank La Sita

    IPC: H04W74/00 ,  H04W74/08 ,  H04W72/04 ,  H04W72/10 ,  H04B17/318

    Abstract: Methods and apparatuses for enhancing random access procedures are described herein. A method performed by an access point (AP) may comprise allocating a plurality of random access (RA) resource units (RA-RUs) for transmitting a message from a station (STA) to the AP over an upper or lower frequency band. The method may comprise transmitting, to a station (STA), one or more physical layer convergence procedure (PLCP) protocol data unit (PPDU) over the upper or lower frequency bands. Each of the one or more PPDUs may include a trigger frame, and the trigger frame may include an indication of the plurality of RA-RUs and a target received signal strength indicator (TRSSI) associated with at least one of the upper or lower frequency bands. The method may comprise receiving, in response to the trigger frame, the message from the STA in one of the plurality of RA-RUs.

    Beamforming methods and methods for using beams
    27.
    发明授权
    Beamforming methods and methods for using beams 有权

    公开(公告)号：US11122444B2

    公开(公告)日：2021-09-14

    申请号：US14441237

    申请日：2013-11-08

    Applicant: InterDigital Patent Holdings, Inc.

    Inventor： Hanqing Lou ,  Pengfei Xia ,  Monisha Ghosh ,  Oghenekome Oteri ,  Robert L. Olesen

    IPC: H04W16/28 ,  H04B7/0408 ,  H04B7/0452 ,  H04B7/06 ,  H04B7/0417 ,  H04W72/04 ,  H04W88/08 ,  H04B7/0413

    Abstract: A method, apparatus, system, and computer readable medium may be used to perform beamforming. The method may include a first communication device sending a first plurality of beamforming training frames to a second communication device using a first beamforming weight vector; the first communication device receiving from the second communication device a second beamforming weight vector; and the first communication device sending a second plurality of beamforming training frames to the second communication device using the second beamforming weight vector. The apparatus, method, system, and computer readable media may use spatial diversity with beam switching, spatial diversity with a single beam, weighted multipath beamforming training, single user spatial multiplexing, and beamforming training for beam division multiple access (BDMA).

    Systems and methods for beamforming training in wireless local area networks
    28.
    发明授权
    Systems and methods for beamforming training in wireless local area networks 有权

    公开(公告)号：US11082114B2

    公开(公告)日：2021-08-03

    申请号：US16826512

    申请日：2020-03-23

    Applicant: InterDigital Patent Holdings, Inc.

    Inventor： Hanqing Lou ,  Xiaofei Wang ,  Oghenekome Oteri

    IPC: H04B7/06 ,  H04B7/08 ,  H04B17/12 ,  H04W72/04 ,  H04W74/00 ,  H04B7/0413

    Abstract: Presently disclosed are systems and methods for beamforming training in WLANs. In various embodiments, there are unified MIMO beamforming training procedure, which includes a training period in which an initiator transmits multiple unified training frames for performing a transmit-beamforming training of the initiator and a receive-beamforming training of one or more responders; a feedback period in which each responder replies with a beamforming-feedback response; and an acknowledgement period during which the initiator transmits respective acknowledgement frames to the one or more responders from which responses were received. Rules for restricted random access in various slots of the feedback period may be implemented, to address response contention between multiple qualifying responders.

    MULTIDIMENSIONAL BEAM REFINEMENT PROCEDURES AND SIGNALING FOR MMWAVE WLANS
    29.
    发明申请
    MULTIDIMENSIONAL BEAM REFINEMENT PROCEDURES AND SIGNALING FOR MMWAVE WLANS 有权

    公开(公告)号：US20210234603A1

    公开(公告)日：2021-07-29

    申请号：US17230473

    申请日：2021-04-14

    Applicant: InterDigital Patent Holdings, Inc.

    Inventor： Oghenekome Oteri ,  Hanqing Lou ,  Alphan Sahin ,  Rui Yang ,  Cen Lin ,  Xiaofei Wang ,  Li Hsiang Sun

    IPC: H04B7/06

    Abstract: Systems and methods for multidimensional beam refinement procedures and signaling for millimeter wave WLANs. In some embodiments, there are multi-dimensional enhanced beam refinement protocol MAC and PHY frame designs that extend the MAC packet and the PPDU format with or without backwards compatibility. The multiple dimensions may be supported jointly or separately. In other embodiments, the increased data signaled in the eBRP frame designs may be more efficiently signaled with reduced BRP frame sizes, such as through a training type dependent BRP minimum duration selection procedure or use of null data packet BRP frames. In further embodiments, the maximum duration of the interframe spacing between BPR packets may be varied to improve the efficiency of BRP operation.

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