公开(公告)号：US20140211642A1

公开(公告)日：2014-07-31

申请号：US13754823

申请日：2013-01-30

Applicant: QUALCOMM INCORPORATED

Inventor： Shu Du ,  Zhanfeng Jia ,  Ning Zhang ,  Qinghai Gao

IPC: H04W72/08

CPC classification number: H04W72/085 ,  H04B7/0452 ,  H04B7/0619 ,  H04B7/0689 ,  H04L1/0003 ,  H04L1/0006 ,  H04L1/0009 ,  Y02D50/10

Abstract: A method of performing transmission from an access point (AP) in a wireless communication system provides transmission setting adjustment after sounding. In this method, stations associated with the AP and having transmission data can be identified. Transmission to those stations can be performed using a predetermined transmission setting. For a first transmission after a sounding, the predetermined transmission setting can be boosted. For any transmission other than the first transmission after the sounding, a current or adjusted transmission setting can be used based on a detected PER during transmission. An adjusted transmission setting can be an MCS rate, a user-level (SU-BF, 2U-MIMO, or 3U-MIMO), or an aggregated MAC protocol data unit (AMPDU) aggregation level. A single transmission setting or a combination of settings can be used. The method can be used with any transmission setting(s), including those mapped from the Signal to Interference and Noise Ratio (SINR).

Abstract translation: 从无线通信系统中的接入点（AP）进行发送的方法在发声后提供发送设定调整。 在该方法中，可以识别与AP相关联并具有传输数据的站。 可以使用预定的传输设置来执行对这些站的传输。 对于发声后的第一次传输，可以提高预定的传输设置。 对于在发声之后的第一次传输之外的任何传输，可以基于传输期间的检测到的PER使用当前或调整的传输设置。 调整后的传输设置可以是MCS速率，用户级（SU-BF，2U-MIMO或3U-MIMO）或聚合的MAC协议数据单元（AMPDU）聚合级别。 可以使用单个传输设置或设置的组合。 该方法可以与任何传输设置一起使用，包括从信号到干扰和噪声比（SINR）映射的传输设置。

公开(公告)号：US20140092819A1

公开(公告)日：2014-04-03

申请号：US13633849

申请日：2012-10-02

Applicant: QUALCOMM INCORPORATED

Inventor： Shu Du ,  Zhanfeng Jia ,  Ning Zhang ,  Qinghai Gao ,  Balaji Srinivasan Babu

IPC: H04W72/04 ,  H04W72/10

CPC classification number: H04B7/0452 ,  H04W72/121 ,  H04W72/1221

Abstract: An access point determines the buffered data for each station of a plurality of stations in a BSS and groups the stations with similar station characteristics. The transmission time to the stations in a group can be apportioned. The groups can be ordered based on station characteristics and a transmission history. A sounding for a group can be performed based on the order. The MU-MIMO transmission for the group can be performed until a first condition is met. If the first condition is met, then the sounding and the MU-MIMO transmission for a next group can be performed, according to the order, until a second condition is met. The first condition can include an apportioned transmission time having expired and/or the buffers for the group being flushed. The second condition can include new data having been buffered by the AP and/or all buffered data having been transmitted.

Abstract translation: 接入点确定BSS中多个站的每个站的缓冲数据，并对具有相似站特征的站进行分组。 可以分配到组中的站的传输时间。 可以根据车站特性和发送历史来订购组。 可以根据订单执行组的探测。 可以执行组的MU-MIMO传输，直到满足第一条件。 如果满足第一条件，则可以根据顺序执行下一组的发声和MU-MIMO传输，直到满足第二条件。 第一个条件可以包括分配的传输时间已经到期，和/或被刷新的组的缓冲区。 第二条件可以包括已被AP缓冲的新数据和/或已经发送的所有缓冲数据。

公开(公告)号：US20130315326A1

公开(公告)日：2013-11-28

申请号：US13947653

申请日：2013-07-22

Applicant: QUALCOMM Incorporated

Inventor： Kai Shi ,  Ning Zhang

IPC: H04B7/04

CPC classification number: H04L5/0048 ,  H04B7/0413 ,  H04B7/0421 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/023 ,  H04L27/2657 ,  H04L27/2672 ,  H04L27/2675 ,  H04L27/2695

Abstract: In a multiple-input, multiple-output (MIMO) system, a wireless node's receive chain demodulation function is enhanced to include phase tracking. VHT Long Training Fields (LTFs) embedded in a frame preamble are used for phase tracking. Single stream pilot tones are added during transmission of VHT-LTFs. A receiver estimates the channel using the pilot tones in a first set of LTFs. A second set of LTFs are used to estimate the phase of the pilot tones using the estimated channel. The phase estimation is continuously applied to other received data tones throughout the VHT-LTFs of data symbols. Phase errors due to PLL mismatches and phase noise are reduced at reception, leading to better signal to noise ratio for different levels of drift and frequency offset. Further, MIMO channel estimation is more accurate, improving the overall wireless network when the accurate MIMO channel estimation data participates in calibration and handshake between wireless nodes.

Abstract translation: 在多输入多输出（MIMO）系统中，无线节点的接收链解调功能被增强以包括相位跟踪。 嵌入在帧前同步码中的VHT长训练场（LTF）用于相位跟踪。 在VHT-LTF的传输期间添加单流导频音。 接收机使用第一组LTF中的导频音来估计信道。 第二组LTF用于使用估计的信道来估计导频音的相位。 在数据符号的整个VHT-LTF中，相位估计被连续地应用于其他接收的数据音调。 在接收时，由于PLL错配和相位噪声引起的相位误差降低，导致不同漂移和频率偏移水平的更好的信噪比。 此外，当准确的MIMO信道估计数据参与无线节点之间的校准和握手时，MIMO信道估计更准确，改善了整个无线网络。

公开(公告)号：US20130265907A1

公开(公告)日：2013-10-10

申请号：US13801632

申请日：2013-03-13

Applicant: QUALCOMM INCORPORATED

Inventor： Youhan Kim ,  Adrian H. Chadd ,  Michael R. Green ,  Ning Zhang ,  Vincent K. Jones

IPC: H04W88/06 ,  H04W88/08

CPC classification number: H04W88/06 ,  H04L5/001 ,  H04L5/0044 ,  H04L5/0064 ,  H04W48/12 ,  H04W72/048 ,  H04W76/15 ,  H04W88/08 ,  H04W88/10

Abstract: A wireless device may be configured to operate in one of two modes where each mode uses a different channel list to perform operations in accordance with the IEEE 802.11 standard. In a first mode, the wireless device operates as an access point that sets up channels using one channel list in order to facilitate communications within a basic service set (BSS). In a second mode, the wireless device uses a second channel list to operate as a station and scan for a BSS. The first channel list contains a subset of the channels contained in the second channel list. The channels in each respective channel list may be reconfigured to adapt to changes in the configuration of a BSS and the devices communicating therein.

Abstract translation: 无线设备可以被配置为以两种模式之一操作，其中每个模式使用不同的频道列表来执行根据IEEE 802.11标准的操作。 在第一模式中，无线设备作为接入点进行操作，该接入点使用一个信道列表建立信道，以促进基本业务集（BSS）内的通信。 在第二模式中，无线设备使用第二频道列表作为站并且扫描BSS。 第一频道列表包含第二频道列表中包含的频道的子集。 可以重新配置每个相应频道列表中的频道以适应BSS及其中通信的设备的配置的变化。

公开(公告)号：US20190036739A1

公开(公告)日：2019-01-31

申请号：US16046599

申请日：2018-07-26

Applicant: QUALCOMM Incorporated

Inventor： Erik David Lindskog ,  Ning Zhang ,  Xiaoxin Zhang ,  Alireza Raissinia ,  Naveen Kumar Kakani

IPC: H04L25/02 ,  H04L5/00 ,  H04L27/26 ,  H04L9/08 ,  H04L29/06

Abstract: Methods, systems, and devices for wireless communication are described. A ranging message procedure may employ protection by modifying a cyclic prefix of the ranging message to prevent an attacking device from transmitting a time-advanced copy of the cyclic prefix during symbol of the copied signal. For example, the modified cyclic prefix may include pseudo random training sequences or a set of zero-value symbols. The receiving device may determine a channel estimation technique that accounts for the modified cyclic prefix. The wireless devices performing the ranging measurement process may determine a modulation and coding scheme (MCS) for the ranging message. The wireless devices may negotiate an MCS value and cyclic prefix configuration for the ranging measurement process. In some examples, the ranging message be encoded by applying a sequence of phase rotations or amplitude variations to the base sequence used to generate the sounding training signal.

公开(公告)号：US10171265B2

公开(公告)日：2019-01-01

申请号：US15260144

申请日：2016-09-08

Applicant: QUALCOMM Incorporated

Inventor： Chin-Hung Chen ,  Ning Zhang ,  Youhan Kim

IPC: H04L25/02 ,  H04B7/0413 ,  H04B7/06 ,  H04L27/26 ,  H04B7/0452 ,  H04W72/04 ,  H04W84/12

Abstract: A method for sending data includes receiving, at a first station of a plurality of stations, a trigger frame from an access point of a wireless network. The method also includes determining a downlink channel estimation based on the trigger frame and sending the downlink channel estimation to the access point. The method further includes receiving uplink channel data from the access point in response to sending the downlink channel estimation. The method also includes sending data to the access point based on the uplink channel data.

公开(公告)号：US20180184365A1

公开(公告)日：2018-06-28

申请号：US15849461

申请日：2017-12-20

Applicant: QUALCOMM Incorporated

Inventor： Ravi Gidvani ,  Alireza Raissinia ,  Ning Zhang ,  Ramaswamy Venkateshwaran

IPC: H04W48/16 ,  H04W24/02

CPC classification number: H04W48/16 ,  H04W16/00 ,  H04W24/02 ,  H04W48/12 ,  H04W84/12

Abstract: Methods, systems, and devices for wireless communication are described. Devices in a wireless network may be grouped into a basic service set (BSS), which may enable coordination of communications within the network. A BSS may have an associated coverage area. Some devices may be operable to communicate using extended range (ER) transmissions, which may increase the size of the coverage area associated with the BSS. In some cases, an access point (AP) may support multiple BSSs with equivalent security profiles. A first BSS may exclusively support ER transmissions, while a second BSS may support non-ER transmissions. Techniques are described for a wireless device to discover one or more of the BSSs associated with a given AP, associate with at least one of the discovered BSSs, and in some cases switch between the BSSs with equivalent security profiles. The discussed techniques may provide more efficient communications in the wireless network.

公开(公告)号：US09907044B2

公开(公告)日：2018-02-27

申请号：US14837775

申请日：2015-08-27

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxin Zhang ,  Ning Zhang ,  Carlos Horacio Aldana ,  Youhan Kim ,  Praveen Dua ,  Meghna Agrawal

IPC: H04L12/26 ,  H04W64/00 ,  H04L12/841 ,  H04W52/02 ,  H04L5/00 ,  H04W84/12

CPC classification number: H04W64/00 ,  H04L5/0055 ,  H04L47/283 ,  H04W24/00 ,  H04W52/0209 ,  H04W84/12 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/162 ,  Y02D70/22

Abstract: A ranging operation between a first wireless device and a second wireless may be performed by: sending, to the second wireless device, a data frame including a request for the second wireless device to report its actual SIFS duration to the first wireless device; determining a time of departure (TOD) of the data frame; receiving, from the second wireless device, a response frame including SIFS information indicative of the actual SIFS duration of the second wireless device; determining a time of arrival (TOA) of the response frame; and determining a round trip time (RTT) of the data frame and the response frame using the TOD of the data frame, the TOA of the response frame, and the actual SIFS duration of the second wireless device.

公开(公告)号：US20180011179A1

公开(公告)日：2018-01-11

申请号：US15643188

申请日：2017-07-06

Applicant: QUALCOMM Incorporated

Inventor： Xiaoxin Zhang ,  Ning Zhang ,  Youhan Kim ,  Rahul Malik ,  James Cho

IPC: G01S11/02 ,  H04L29/06 ,  H04B7/06 ,  H04W84/12

CPC classification number: G01S11/026 ,  H04B7/06 ,  H04L5/0048 ,  H04L27/2613 ,  H04L27/2646 ,  H04L27/2663 ,  H04L69/22 ,  H04W64/00 ,  H04W84/12

Abstract: This disclosure provides systems, methods and apparatuses for detecting a presence of long training fields (LTFs) in packet extensions of high-efficiency (HE) packets. An apparatus requests a length of packet extensions to be used for a ranging operation. The apparatus receives an HE packet including a packet extension containing a selected number of LTFs based at least in part on the requested packet extension length. The apparatus performs the ranging operation based on a determination that the packet extension contains LTFs. In some aspects, the apparatus detects a presence of LTFs in the packet extension based on a bit provided in the HE packet. In some other aspects, the apparatus detects a presence of LTFs in the packet extension by extracting sequences from the packet extension.

公开(公告)号：US09867004B2

公开(公告)日：2018-01-09

申请号：US15080337

申请日：2016-03-24

Applicant: QUALCOMM Incorporated

Inventor： Carlos Horacio Aldana ,  Ning Zhang ,  James Simon Cho ,  Xiaoxin Zhang

IPC: H04W24/00 ,  H04W4/02 ,  H04W56/00 ,  H04L27/26 ,  G01S5/14

CPC classification number: H04W4/023 ,  G01S5/021 ,  G01S5/14 ,  G01S11/08 ,  G01S19/48 ,  H04L27/266 ,  H04W4/02 ,  H04W56/0015 ,  H04W56/0025

Abstract: Disclosed herein are techniques for range measurement between one or more wireless stations (STAs) and a first access point (AP). In various embodiments, the first AP may synchronize a clock of the first AP with clocks of one or more synchronized APs. The first AP may perform a synchronization session with the one or more STAs. The first AP may also transmit one or more Broadcast time-of-departure (TOD) frames to the one or more STAs. Each of the one or more Broadcast TOD frames may include a time of departure of a Broadcast TOD frame from the first AP. A second AP and a third AP of the one or more synchronized APs may also transmit one or more Broadcast TOD frames to the one or more STAs for range and/or position determination.