公开(公告)号：US20180262366A1

公开(公告)日：2018-09-13

申请号：US15758921

申请日：2016-09-06

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Alphan Sahin ,  Rui Yang ,  Hanqing Lou ,  Oghenekome Oteri ,  Robert L. Olesen ,  Fengjun Xi

IPC: H04L25/02 ,  H04B7/0413

CPC classification number: H04L25/024 ,  H04B7/0413 ,  H04B7/0452 ,  H04B7/0617 ,  H04B7/0626 ,  H04L5/0023 ,  H04L5/0053 ,  H04L25/0204 ,  H04L27/2613

Abstract: Methods, apparatuses, and systems to enable a channel estimation of more than one channel for Multi-Input Multi-Output (MIMO) communications in a wireless network is provided. The method includes determining a first set of complex numbers comprising first channel estimation signal associated with a first channel, determining a second set of complex numbers comprising second channel estimation signal associated with a second channel, and transmitting the first set of complex numbers and the second set of complex numbers via a physical layer (PHY) frame, wherein the second set of complex numbers are complex conjugates of the first set of complex numbers.

公开(公告)号：US20180007712A1

公开(公告)日：2018-01-04

申请号：US15541643

申请日：2016-01-08

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

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

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

CPC classification number: H04W74/006 ,  H04B7/0452 ,  H04W80/00

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：US09807699B2

公开(公告)日：2017-10-31

申请号：US15021634

申请日：2014-09-12

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Oghenekome Oteri ,  Pengfei Xia ,  Xiaofei Wang ,  Hanqing Lou ,  Monisha Ghosh ,  Robert L. Olesen ,  Nirav B. Shah ,  Frank La Sita

IPC: H04W52/24 ,  H04W74/08 ,  H04W84/12 ,  H04W52/12

CPC classification number: H04W52/243 ,  H04W52/12 ,  H04W74/0808 ,  H04W84/12

Abstract: Methods and apparatuses are described herein for adapting clear channel assessment (CCA) thresholds with or without Transmit Power Control (TPC) are disclosed. An IEEE 802.11 station (STA) may dynamically calculate a STA specific transmit power control (TPC) value and a STA specific clear channel assessment (CCA) value based on a target TPC parameter and a target CCA parameter. The target TPC parameter and the target CCA parameter may be received from an IEEE 802.11 cluster head configured to control TPC and CCA for a plurality of STAs associated with the BSS. The target TPC parameter and the target CCA parameter also may be related. The STA may then determine whether a carrier sense multiple access (CSMA) wireless medium of a wireless local area network (WLAN) basic service set (BSS) is occupied or idle based on the STA specific CCA value.

公开(公告)号：US20170294953A1

公开(公告)日：2017-10-12

申请号：US15628096

申请日：2017-06-20

Applicant: InterDigital Patent Holdings, Inc.

Inventor： Monisha Ghosh ,  Xiaofei Wang ,  Hanqing Lou ,  Nirav B. Shah ,  Guodong Zhang ,  Frank La Sita

IPC: H04B7/08 ,  H04B7/06 ,  H04L27/26 ,  H04B7/0452

CPC classification number: H04B7/0851 ,  H04B7/0404 ,  H04B7/0452 ,  H04B7/0628 ,  H04B7/0643 ,  H04B7/066 ,  H04B17/12 ,  H04L27/266 ,  H04W52/146 ,  H04W52/365 ,  H04W56/004 ,  H04W72/042 ,  H04W84/12 ,  H04W88/08

Abstract: WTRUs, access points (APs) and methods thereon are disclosed. A method on a WTRU may include receiving a message from an AP that comprises a beamformee capability element; sending a second message to the AP that comprises a beamformer capability element; and receiving, from the AP, a third message in response to the second message that indicates a group to which the WTRU is assigned. The group may be based on the beamformer capability element and the group may indicate UL transmission information to be used by the WTRU. A method on an AP may include determining a group for multiple WTRUs based on a received beamformer capability element. A method on a WTRU may include sending to an AP a message with a low overhead preamble for UL MU-MIMO. The low overhead preamble may include LTFs that enable the AP to distinguish the WTRU from other WTRUs.

公开(公告)号：US20170257153A1

公开(公告)日：2017-09-07

申请号：US15599651

申请日：2017-05-19

Applicant: InterDigital Patent Holdings, Inc.

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

IPC: H04B7/04 ,  H04B7/06 ,  H04L1/00

CPC classification number: H04B7/0421 ,  H04B7/0617 ,  H04B7/0628 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/0641 ,  H04B7/066 ,  H04L1/007 ,  H04L1/0073

Abstract: Methods for WiFi beamforming, feedback, and sounding (WiBEAM) are described. Codebook based beamforming feedback signaling and sounding mechanisms for use in wireless communications are disclosed. The methods described herein improve the feedback efficiency by using Givens rotation based decompositions and quantizing the resulting angles of the Givens rotation based decompositions using a range from a subset of [0, 2π]. Feedback may also be divided into multiple components to improve feedback efficiency/accuracy. Time domain beamforming reports for taking advantage of channel reciprocity while still taking into account practical radio frequency (RF) channel impairments are also described. Beamforming feedback that prioritized the feedback bits in accordance with the significance of the bits is also disclosed. A preamble structure to enable the use of smoothing methods for improved channel estimation, codebook designs that may be used for codebook based beamforming feedback, and multi-resolution explicit feedback are disclosed as well.

公开(公告)号：US20170230149A1

公开(公告)日：2017-08-10

申请号：US14903620

申请日：2014-07-11

Applicant: InterDigital Pantent Holdings, Inc. ,  InterDigital Patent Holdings, Inc.

Inventor： Xiadfei Wang ,  Guodong Zhang ,  Robert L Olesen ,  Hanqing Lou ,  Monisha Ghosh ,  Pengfei Xia ,  Nirav B Shah ,  Oghenekome Oteri

IPC: H04L1/18 ,  H04L1/00

Abstract: Systems, methods, and instrumentalities are provided to implement a method of communicating a feedback in a wireless local area network (WLAN). A WLAN device may receive a data frame with a hybrid automatic repeat request (HARQ) data indicator in a frame header. The WLAN device may send an acknowledgement frame when the data frame is correctly received and decoded. The WLAN device may send a negative acknowledgement frame when the data frame is not correctly received and decoded.

公开(公告)号：US20170155490A1

公开(公告)日：2017-06-01

申请号：US15430656

申请日：2017-02-13

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Xiaofei Wang ,  Hanqing Lou ,  Monisha Ghosh ,  Sudheer A. Grandhi

IPC: H04L5/00 ,  H04L1/18 ,  H04L1/16

CPC classification number: H04L5/0055 ,  H04L1/1607 ,  H04L1/1671 ,  H04L1/1854 ,  H04L1/1864 ,  H04L2001/0093

Abstract: Methods and apparatuses are disclosed for transmitting a delayed multi-user acknowledgement (ACK) frame in response to data packets received from multiple stations in wireless communication. A recipient may be include at least one processor, a receiver and a transmitter. The processor is configured to establish a group of stations. The receiver is configured to receive packets from the group of stations over a delay period, and the at least one processor configured to generate a delayed multi-user acknowledgement (ACK) frame based on successful receipt of the packets over the delay period. The transmitter is configured to transmit the delayed multi-user ACK frame to the group of stations following the delay period.

公开(公告)号：US20170126363A1

公开(公告)日：2017-05-04

申请号：US15126949

申请日：2015-03-17

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

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

IPC: H04L1/08 ,  H04L1/16 ,  H04L1/00 ,  H04W74/04

CPC classification number: H04L1/08 ,  H04L1/0025 ,  H04L1/0061 ,  H04L1/1607 ,  H04L1/1671 ,  H04L1/20 ,  H04W74/04 ,  H04W84/12

Abstract: A method and apparatus are disclosed for identifying different types of reception failures of a packet. A station (STA) may receive a packet from a transmitting STA and determine whether it is properly received by performing at least one check of a plurality of checks. The STA may determine that reception of the packet was not properly received due to a reception failure based on the at least one check and may generate a negative acknowledgement signal (NACK) signal including an indication of the reception failure cause to enable the transmitting STA to remediate the reception failure cause. The least one check includes determining whether a frame check sequence (FCS) passes, whether a CSMA wireless medium remains busy immediately after an expected packet transmission time, whether there is a power spike during reception of the signal, or whether there are Short training field (STF) and Long Training Field (LTF) correlations.

公开(公告)号：US20160227569A1

公开(公告)日：2016-08-04

申请号：US15097048

申请日：2016-04-12

Applicant: InterDigital Patent Holdings, Inc.

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

IPC: H04W72/12 ,  H04L12/741

CPC classification number: H04W72/121 ,  H04B17/318 ,  H04L1/0025 ,  H04L1/007 ,  H04L1/1664 ,  H04L1/1685 ,  H04L1/1861 ,  H04W72/04 ,  H04W72/0413 ,  H04W72/0453 ,  H04W72/1278 ,  H04W74/004 ,  H04W74/006 ,  H04W74/04 ,  H04W74/06 ,  H04W74/0816 ,  H04W84/12

Abstract: Method and apparatuses may provide multi-user parallel channel access (MU-PCA). For example, a wireless transmit/receive unit (WTRU) is provided that belongs to a MU-PCA group of a plurality of WTRUs that are configured to simultaneously communicate via a plurality of channels managed by an access point (AP). The WTRU may include a receiver configured to receive a data message, from the AP, over a channel associated with the WTRU of the plurality of channels, wherein the data message is one of a group of multiple data messages transmitted simultaneously by the AP over the plurality of channels; and a transmitter configured to transmit a message to the AP over the channel associated with the WTRU, wherein the message includes an indication bit for notifying the AP whether the WTRU has uplink (UL) data to transmit to the AP.

Abstract translation: 方法和装置可以提供多用户并行通道访问（MU-PCA）。 例如，提供了属于多个WTRU的MU-PCA组的无线发送/接收单元（WTRU），其被配置为经由接入点（AP）管理的多个信道同时进行通信。 WTRU可以包括被配置为通过与多个信道中的WTRU相关联的信道从AP接收数据消息的接收机，其中数据消息是由AP在同一时间发射的多个数据消息的组之一， 多个渠道; 以及发射机，被配置为通过与所述WTRU相关联的信道向所述AP发送消息，其中所述消息包括用于通知所述WTRU是否具有要向所述AP发送的上行链路（UL）数据的指示位。

公开(公告)号：US12273157B2

公开(公告)日：2025-04-08

申请号：US17437265

申请日：2020-03-06

Applicant: INTERDIGITAL PATENT HOLDINGS, INC.

Inventor： Hanqing Lou ,  Xiaofei Wang ,  Li-Hsiang Sun ,  Oghenekome Oteri ,  Rui Yang ,  Joseph S. Levy ,  Frank La Sita

IPC: H04B7/024 ,  H04B7/06 ,  H04B17/336

Abstract: A method for multiple access point (AP) transmission is disclosed. The method comprises receiving a repetition beacon from each of a plurality of APs, each received repetition beacon comprising a common information part and an AP-specific information part; decoding at least a subset of the received common information parts to obtain a first parameter; decoding the received AP-specific information parts to obtain a second parameter for each of the plurality of APs; performing a calculation based on the first parameter, the obtained second parameters and a number of the plurality of APs to obtain a calculation result; and transmitting a feedback based on the calculation result to the plurality of AP.