公开(公告)号：US10542555B2

公开(公告)日：2020-01-21

申请号：US16298712

申请日：2019-03-11

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Xiaofei Wang ,  Hanqing Lou ,  Monisha Ghosh ,  Nirav B Shah ,  Guodong Zhang ,  Ronald Murias

IPC: H04W72/12 ,  H04W72/04 ,  H04W74/06 ,  H04W74/00 ,  H04L1/18 ,  H04W74/08 ,  H04L1/16 ,  H04L1/00 ,  H04W74/04 ,  H04B17/318 ,  H04W84/12

Abstract: Methods and apparatuses are related to multi-user parallel channel access (MU-PCA). For example, a wireless transmit/receive unit (WTRU) is provided that is one of a plurality of WTRUs operable to simultaneously communicate via a plurality of channels managed by an access point (AP). The WTRU includes a receiver configured to receive, from the AP, over at least one channel of the plurality of channels, a group poll (G-Poll) message that includes a resource allocation that indicates at least one allocated channel of the plurality of channels for the WTRU; and a transmitter configured to transmit an uplink request message, to the AP in response to the G-Poll message, over the at least one allocated channel of the plurality of channels, the uplink request message corresponding to uplink data the WTRU has for transmission to the AP.

公开(公告)号：US10477576B2

公开(公告)日：2019-11-12

申请号：US15754847

申请日：2016-09-08

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Hanqing Lou ,  Guodong Zhang ,  Li-Hsiang Sun ,  Oghenekome Oteri ,  Robert L. Olesen ,  Fengjun Xi ,  Rui Yang ,  Xiaofei Wang

IPC: H04W74/08 ,  H04W72/12 ,  H04L27/26 ,  H04W84/12

Abstract: A method and apparatus for multi-user concurrent random access for wireless local area networks (WLANs) is described. The method, implemented in a wireless transmit/receive unit (WTRU), includes detecting a trigger frame for uplink (UL) multi-user (MU) transmission. The trigger frame includes an assignment of resource units (RUs) for random access in upcoming UL MU packet data convergence protocol (PDCP) protocol data units (PPDUs) and an indication that the trigger frame is one of a plurality of trigger frames in a cascading sequence of trigger frames in an MU transmission opportunity (TxOP). The method further includes selecting one of the RUs in the assignment of RUs for a random access transmission and sending the random access transmission on the selected one of the RUs.

公开(公告)号：US10440750B2

公开(公告)日：2019-10-08

申请号：US15948869

申请日：2018-04-09

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Hanqing Lou ,  Guodong Zhang ,  Xiaofei Wang ,  Juan Fang ,  Oghenekome Oteri ,  Pengfei Xia ,  Monisha Ghosh ,  Robert L. Olesen

IPC: H04W4/00 ,  H04W74/08 ,  H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L5/00 ,  H04W72/04 ,  H04W84/12

Abstract: A method and apparatus for supporting UL MU diversity are provided. The method may comprise transmitting a MU RTS frame to a plurality of STAs, the MU RTS frame comprising a plurality of MCS indicators, a plurality of data stream number indicators, an indication of a spatial technology, and a duration field. The MU RTS frame solicits clear to send (CTS) frame responses from a plurality of STAs and simultaneous UL OFDMA transmissions may be received in accordance with the MCS indicators, the data stream number indicators and the indicated spatial technology. An AP may transmit another frame comprising UL transmission information for transmission of data frames by the plurality of STAs. The AP may receive from the plurality of STAs, the data frames simultaneously and may additionally transmit acknowledgements of the received data frames to the plurality of STAs.

公开(公告)号：US20190289632A1

公开(公告)日：2019-09-19

申请号：US16433239

申请日：2019-06-06

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Hanqing Lou ,  Guodong Zhang ,  Robert L. Olesen ,  Xiaofei Wang

IPC: H04W74/00 ,  H04W80/00 ,  H04B7/0452

Abstract: Methods, devices and systems are provided for performing for multi-user (MU) transmission. A wireless transmit/receive unit (WTRU) may be configured to receive a frame, decode the received frame and determine whether the received frame is a null data packet (NDP) multi-user (MU) media access control (MAC) physical layer convergence protocol (PLCP) protocol data unit (PPDU) (NDP MU MAC PPDU) based on meeting an NDP condition. The NDP MU MAC PPDU may correspond to an MU transmission and may include a PLCP header which includes an NDP signal (SIG) field having MU control information. Based on the received frame meeting the NDP condition, the WTRU may be further configured to process the NDP SIG field, generate a response based on the NDP SIG field and the MU control information, and transmit the response.

公开(公告)号：US20190215054A1

公开(公告)日：2019-07-11

申请号：US16356651

申请日：2019-03-18

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Guodong Zhang ,  Xiaofei Wang ,  Hanqing Lou ,  Sudheer A. Grandhi

IPC: H04B7/155 ,  H04W52/02 ,  H04W84/04 ,  H04W40/24

CPC classification number: H04B7/15507 ,  H04W36/08 ,  H04W40/244 ,  H04W52/0216 ,  H04W52/0229 ,  H04W84/047 ,  H04W84/12 ,  Y02D70/00 ,  Y02D70/1226 ,  Y02D70/1242 ,  Y02D70/1244 ,  Y02D70/1246 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/23 ,  Y02D70/446

Abstract: A method for receiving data, by an end-STA from a root AP, may comprise receiving, from a relay AP, a first beacon frame comprising a relay information element. The relay information element may include a field which indicates whether a root AP BSSID field indicating a BSSID of the root AP is included in the beacon frame. The end-STA may transmit an association request to the relay AP and may receive an association response from the relay AP if the relay AP is allowed by the root AP to associate with the end-STA. The end-STA may receive, from the relay AP, traffic indication map (TIM) indications, of which at least one of the TIM indications may be for the end-STA. The one of the TIM indications may indicate that the data is available for the end-STA. The end-STA may then receive the data from the relay AP.

公开(公告)号：US10334626B2

公开(公告)日：2019-06-25

申请号：US15827957

申请日：2017-11-30

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Bhaskar M. Anepu ,  Sudheer A. Grandhi ,  Xiaofei Wang

IPC: H04W28/06 ,  H04W28/26 ,  H04W74/00 ,  H04W74/04 ,  H04W74/06 ,  H04W74/08 ,  H04W76/11 ,  H04W88/08

Abstract: Enhanced protocols and devices may be used to alleviate loss of spectrum efficiency in wideband transmission. The protocols may implement a wideband transmission opportunity (TXOP) truncation where one or more of the channels involved in communication over the wideband are released. In one scenario, an access point (AP) may receive, from a wireless transmit receive unit (WTRU), a first CF-End frame that includes a duration field and a basic service set identifier (BSSID) field that includes an individual/group bit. On a condition that the individual/group bit of the BSSID field has a value of one (1), the AP may determine that a scrambling sequence of the first CF-End frame indicates a bandwidth associated with a transmit opportunity (TXOP) being truncated by the WTRU. The AP may then transmit a second CF-End frame at the bandwidth indicated by the scrambling sequence of the first CF-End frame.

公开(公告)号：US10306544B2

公开(公告)日：2019-05-28

申请号：US15033634

申请日：2014-11-07

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Xiaofei Wang ,  Guodong Zhang

IPC: H04L12/801 ,  H04B1/50 ,  H04W84/18 ,  H04L1/00 ,  H04W48/16 ,  H04W74/00 ,  H04W48/14 ,  H04W84/12

Abstract: Systems, methods, and instrumentalities are disclosed for reducing contention in a wireless network. An IEEE 802.11 station (STA) may send a request frame to an IEEE 802.11 access point (AP). The AP may be able to accommodate the IEEE 802.11 STA. The STA may receive a response frame that may include a basic service set (BSS) discovery policy. The IEEE 802.11 STA may send a revised request frame, when the indicated BSS discover method is active scanning. The revised request frame may be sent based on the BSS discovery policy received from the IEEE 802.11 AP during the period of time. The IEEE 802.11 STA may send the revised request frame, e.g., when time elapsed since last second request exceeds an active scanning interval. The IEEE 802.11 STA may refrain from sending the second request frame, e.g., when the indicated BSS discovery method received from the IEEE 802.11 AP is passive scanning.

公开(公告)号：US10236967B2

公开(公告)日：2019-03-19

申请号：US15784992

申请日：2017-10-16

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Guodong Zhang ,  Xiaofei Wang ,  Hanqing Lou ,  Sudheer A. Grandhi

IPC: H04H20/71 ,  H04B7/155 ,  H04W84/04 ,  H04W40/24 ,  H04W52/02 ,  H04W36/08 ,  H04W84/12

Abstract: A method and apparatus for use in an IEEE 802.11 root access point (AP) are provided. The method may comprise transmitting, from the root AP to the R-AP, an indication of a number of end-STAs which the R-AP is allowed to associate with. A first message may be received, from the R-AP that enables the root AP to associate the end-STA with the R-AP, the first message including: an indication of a number of information fields in the first message and a number of information fields identified by the indication of the number of information fields. Each information field may include a unique identifier associated with a respective indicated end-STA associated with the R-AP. A second message may be transmitted for the end-STA, from the root AP to the R-AP, and the second message may include the unique identifier.

公开(公告)号：US20190081674A1

公开(公告)日：2019-03-14

申请号：US16083757

申请日：2017-03-10

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Oghenekome Oteri ,  Alphan Sahin ,  Hanqing Lou ,  Xiaofei Wang ,  Cen Lin

IPC: H04B7/06 ,  H04B7/0417 ,  H04B7/0456 ,  H04B7/0491 ,  H04L27/18

CPC classification number: H04B7/0617 ,  H04B7/0421 ,  H04B7/0456 ,  H04B7/0491 ,  H04B7/061 ,  H04B7/0619 ,  H04B7/0695 ,  H04L27/183 ,  H04W84/12

Abstract: Systems, methods, and instrumentalities are disclosed for multi-resolution training, for example, in millimeter wave (mmW) WLAN systems. In a Multi-Resolution Beam Refinement Protocol (MR-BRP), an access point (AP)/PBSS control point (PCP) and a station (STA) may perform multi-resolution beamforming training, for example, by changing a sub-beam resolution or by maintaining sub-beam resolution while changing a resolution of the beamforming training between levels or stages of training. Sub-beam resolution may be changed, for example, by assigning different angular spreads to or by downselecting a number of antenna elements while keeping inter-element spacing constant between levels of training. Resolution of beamforming training may be changed, for example, by downsampling sub-beams or by downsampling antenna elements while adjusting inter-element spacing. Beamforming training (e.g. refinement) levels may refine beams by changing a resolution of antenna weight vectors (AWVs). An AP/PCP and STA may search through a sector multiple times with sub-beams of different resolution to identify a correct pair of sub-beams at a desired resolution. MR-BRP may be used for single or multiple beams, for example, to generate M sub-beams (AWVs) for N beams sequentially or in parallel. MR-BRP may be used for beam tracking. Devices may save the best sub-beam at each level of MR-BRP and may revert (fall back) to a sub-beam at previous level. MR-BRP signaling may indicate MR-BRP capability, type, frame format, etc.

公开(公告)号：US20180368079A1

公开(公告)日：2018-12-20

申请号：US16101966

申请日：2018-08-13

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Xiaofei Wang ,  Guodong Zhang ,  Robert L. Olesen

IPC: H04W52/34 ,  H04W52/24 ,  H04W48/14

CPC classification number: H04W52/34 ,  H04W48/08 ,  H04W48/12 ,  H04W48/14 ,  H04W52/241 ,  H04W84/12

Abstract: A method and apparatus may be used to perform efficient network transitions. One or more of Probe Request frames that an AP may receive or process as valid may be modified by including a transmit power for the Probe Request frame. A Probe Request frame may be transmitted at less than full power. BSS transitions may be enhanced by indicating reasons for the transition, security information, or quality of service (QoS) information. Overhead associated with tracking long-sleeping STAs may be managed through the use of multiple values for a maximum idle period in a BSS.