公开(公告)号：EP2974067B1

公开(公告)日：2019-11-06

申请号：EP14728703.1

申请日：2014-03-13

申请人： Interdigital Patent Holdings, Inc.

发明人： XIA, Pengfei ,  OTERI, Oghenekome ,  SHAH, Nirav, B. ,  GHOSH, Monisha ,  LOU, Hanqing ,  OLESEN, Robert, L.

IPC分类号： H04B7/0452 ,  H04B7/0417 ,  H04B7/06 ,  H04B7/0456

公开(公告)号：EP3017643B1

公开(公告)日：2019-09-11

申请号：EP14742683.7

申请日：2014-07-02

申请人： Interdigital Patent Holdings, Inc.

发明人： LOU, Hanqing ,  OTERI, Oghenekome ,  GHOSH, Monisha ,  XIA, Pengfei ,  OLESEN, Robert, L.

IPC分类号： H04W72/04 ,  H04W84/12 ,  H04W72/08

公开(公告)号：EP3170356A1

公开(公告)日：2017-05-24

申请号：EP15750854.0

申请日：2015-07-17

申请人： Interdigital Patent Holdings, Inc.

发明人： LOU, Hanqing ,  XIA, Pengfei ,  GHOSH, Monisha ,  FANG, Juan ,  OTERI, Oghenekome ,  SHAH, Nirav B. ,  OLESEN, Robert L.

IPC分类号： H04W74/04 ,  H04W84/12 ,  H04B7/04

CPC分类号： H04W72/1252 ,  H04B7/0452 ,  H04W52/18 ,  H04W74/04

摘要： Systems, methods, and instrumentalities are described to implement WLAN uplink multi-user multiple input multiple output (UL MU-MIMO) communication in an Institute of Electrical and Electronics Engineers (IEEE) 802.11 based system, using an IEEE 802.11 station (STA). The STA may receive a downlink poll frame from an IEEE 802.11 access point (AP) including one or more of a request for reporting of a transmit power, a request for a timestamp of a response frame, or a request for an estimated carrier frequency offset (CFO) value. The STA may send an uplink response frame. The uplink response frame may include one or more of transmit power parameters, timestamp parameters, or an estimated CFO value to an AP. The STA may receive a schedule frame, wherein the schedule frame may include indication to adjust one or more of a transmit power, a timing correction value, or a CFO correction value.

摘要翻译： 描述了使用IEEE 802.11站（STA）在基于电气和电子工程师协会（IEEE）802.11的系统中实现WLAN上行链路多用户多输入多输出（UL MU-MIMO）通信的系统，方法和手段。 。 STA可以从IEEE 802.11接入点（AP）接收下行链路轮询帧，该下行链路轮询帧包括对发送功率的报告的请求，对响应帧的时间戳的请求或对估计的载波频率的请求中的一个或多个 抵消（CFO）值。 STA可以发送上行链路响应帧。 上行链路响应帧可以包括发射功率参数，时间戳参数或到AP的估计的CFO值中的一个或多个。 STA可以接收调度帧，其中调度帧可以包括用于调整发射功率，定时校正值或CFO校正值中的一个或多个的指示。

公开(公告)号：EP3045008A1

公开(公告)日：2016-07-20

申请号：EP14780931.3

申请日：2014-09-12

申请人： Interdigital Patent Holdings, Inc.

发明人： OTERI, Oghenekome ,  XIA, Pengfei ,  WANG, Xiaofei ,  LOU, Hanqing ,  GHOSH, Monisha ,  OLESEN, Robert L. ,  SHAH, Nirav B. ,  LA SITA, Frank

IPC分类号： H04W74/08 ,  H04W84/12 ,  H04W52/00

CPC分类号： H04W52/243 ,  H04W52/12 ,  H04W74/0808 ,  H04W84/12

摘要： 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.

摘要翻译： 本文描述了用于适应具有或不具有发射功率控制（TPC）的清晰信道评估（CCA）阈值的方法和装置。 IEEE 802.11站（STA）可以基于目标TPC参数和目标CCA参数动态地计算STA特定发射功率控制（TPC）值和STA特定清除信道评估（CCA）值。 目标TPC参数和目标CCA参数可以从被配置为对与BSS相关联的多个STA进行TPC和CCA的控制的IEEE 802.11集群头接收。 目标TPC参数和目标CCA参数也可能相关。 STA然后可以基于STA特定CCA值来确定无线局域网（WLAN）基本服务集（BSS）的载波侦听多路访问（CSMA）无线介质是占用还是空闲。

公开(公告)号：EP2974067A1

公开(公告)日：2016-01-20

申请号：EP14728703.1

申请日：2014-03-13

申请人： Interdigital Patent Holdings, Inc.

发明人： XIA, Pengfei ,  OTERI, Oghenekome ,  SHAH, Nirav, B. ,  GHOSH, Monisha ,  LOU, Hanqing ,  OLESEN, Robert, L.

IPC分类号： H04B7/04 ,  H04B7/06

摘要： A station is used to implement non-linear coding based multiuser multiple-input multiple-output (MU-MIMO). The station includes a processor that may be configured to perform a number of actions. For example, the processor receives a null packet from an access point (AP). Channel feedback is generated using the null packet. The channel feedback is sent to the AP. QR dependent information is received from the AP. Data is sent to the AP according to the QR dependent information.

公开(公告)号：EP2915382A1

公开(公告)日：2015-09-09

申请号：EP13795347.7

申请日：2013-11-04

申请人： Interdigital Patent Holdings, Inc.

发明人： OTERI, Oghenekome ,  XIA, Pengfei ,  LOU, Hanqing ,  GHOSH, Monisha ,  OLESEN, Robert L. ,  SHAH, Nirav B. ,  LA SITA, Frank

IPC分类号： H04W52/28

CPC分类号： H04W52/10 ,  H04W24/10 ,  H04W52/08 ,  H04W52/28 ,  H04W84/12 ,  Y02D70/00

摘要： A method and apparatus is described herein for performing loop power control and transmission power control (TPC) in a wireless network. Described herein are methods including using separate power control loops for communication with an entire wireless network and for point-to-point (P2P) transmissions and separate power control loops for omni-directional and directional beamformed transmissions. Also described herein are methods and apparatuses for requesting clear channel assessment (CCA) measurements and adjusting CCA thresholds and transmission power based on the reported measurements. Methods and apparatuses are also described wherein access points (APs) coordinate transmission power to reduce interference with each other and to determine optimal transmission power to each mobile station (STA).

公开(公告)号：EP2901569A1

公开(公告)日：2015-08-05

申请号：EP13779445.9

申请日：2013-09-27

申请人： Interdigital Patent Holdings, Inc.

发明人： XIA, Pengfei ,  GHOSH, Monisha ,  LOU, Hanqing ,  OLESEN, Robert L. ,  OTERI, Oghenekome

IPC分类号： H04B7/04 ,  H04B7/06 ,  H04L1/00

CPC分类号： H04B7/0421 ,  H04B7/0617 ,  H04B7/0628 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/0641 ,  H04B7/066 ,  H04L1/007 ,  H04L1/0073

摘要： 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 prioritizes 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.

摘要翻译： 描述了用于WiFi波束成形，反馈和探测（WiBEAM）的方法。 公开了用于无线通信的基于码本的波束成形反馈信令和探测机制。 本文描述的方法通过使用基于Givens旋转分解并使用来自[0,2＆pgr]的子集的范围来量化基于Givens旋转的分解的所得角度来提高反馈效率。 反馈也可以分为多个组件来提高反馈效率/精度。 还描述了利用信道互易性同时考虑到实际射频（RF）信道损伤的时域波束成形报告。 还公开了根据比特的重要性对反馈比特优先化的波束形成反馈。 还公开了能够使用用于改进的信道估计的平滑方法，可用于基于码本的波束形成反馈的码本设计以及多分辨率显式反馈的前导码结构。

公开(公告)号：EP4376496A3

公开(公告)日：2024-07-17

申请号：EP24155528.3

申请日：2014-09-12

申请人： InterDigital Patent Holdings, Inc.

发明人： OTERI, Oghenekome ,  XIA, Pengfei ,  WANG, Xiaofei ,  LOU, Hanqing ,  GHOSH, Monisha ,  OLESEN, Robert L. ,  SHAH, Nirav B. ,  LA SITA, Frank

IPC分类号： H04W52/24 ,  H04W52/36 ,  H04W84/12 ,  H04W74/0808 ,  H04W52/14 ,  H04W52/12

CPC分类号： H04W74/0808 ,  H04W52/12 ,  H04W84/12 ,  H04W52/367 ,  H04W52/245 ,  H04W52/243 ,  H04W52/146

摘要： 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：EP4050809A1

公开(公告)日：2022-08-31

申请号：EP22156405.7

申请日：2015-09-11

申请人： Interdigital Patent Holdings, Inc.

发明人： LOU, Hanqing ,  OTERI, Oghenekome ,  XIA, Pengfei ,  OLESEN, Robert L

IPC分类号： H04B7/04 ,  H04B7/06 ,  H04L5/00 ,  H04B7/0452

摘要： Systems, methods, and instrumentalities are provided to determine a physical layer (PHY) protocol data unit (PPDU) format. A determination may be made if a basic service set (BSS) includes a first-type legacy station, wherein the first-type legacy station is a pre-802.1 In device. A determination may be made if stations in the BSS support a short format preamble. A determination may be made if beamforming or precoding is to be used in association with an upcoming multi-user transmission. An indication of a selected PPDU preamble format may be sent to a station in the BSS via a multi-user transmission, wherein a long format preamble is selected when the BSS includes the first-type legacy station, beamforming is to be used in association with the upcoming multi-user transmission, or precoding is to be used in association with the upcoming multi-user transmission, and the short format preamble is selected when the BSS does not include the first-type legacy station, beamforming is to not be used in association with the upcoming multi-user transmission, and precoding is not to be used in association with the upcoming multi-user transmission.

公开(公告)号：EP3210354A1

公开(公告)日：2017-08-30

申请号：EP15791138.9

申请日：2015-10-22

申请人： Interdigital Patent Holdings, Inc.

发明人： JIN, Yuan, Sheng ,  XI, Fengjun ,  XIA, Pengfei ,  SHAH, Nirav, B. ,  LOU, Hanqing ,  OLESEN, Robert, L. ,  OTERI, Oghenekome

IPC分类号： H04L27/26 ,  H04L25/03 ,  H04B7/06

CPC分类号： H04L27/2646 ,  H04B7/0617 ,  H04B7/0619 ,  H04L25/03343 ,  H04L27/2607 ,  H04L27/2613

摘要： W-LAN evolutions to support outdoor scenarios are proposed. In such outdoor scenarios, the usual cyclic prefix length of 800 nano-seconds is not long enough to capture all multipath components. The present application proposes to use longer CP than the normal IEEE 802.11 CP and a negotiation protocol for selecting the CP length. A so-called cyclic prefix discovery frame is sent from the Access Point (AP) to the stations (STA) requesting measurement (ie of the time domain channel estimation) and feedback of the desired Guard Period length (1.6 up to 6.4 micro-seconds are also available). A special Non Data Packet Long Delay Spread (NDP-L) frame is sent from the AP to the STAs to help measuring the delay spread. Further ideas (not claimed) comprise channel shortening using beamforming (after of before the IFFT) to reduce the delay spread of outdoor W-LAN signals.

摘要翻译： 提出W-LAN演变以支持户外场景。 在这种户外场景中，800纳秒的常用循环前缀长度不足以捕获所有多路径组件。 本申请提出使用比常规IEEE 802.11 CP更长的CP和用于选择CP长度的协商协议。 所谓的循环前缀发现帧从接入点（AP）发送到请求测量（即时域信道估计）的站（STA）并且期望的保护时段长度（1.6到6.4微秒 也可用）。 从AP向STA发送特殊的非数据分组长延时扩展（NDP-L）帧，以帮助测量延迟扩展。 进一步的想法（未声明）包括使用波束成形（在IFFT之前）来缩短室外W-LAN信号的延迟扩展的信道缩短。