公开(公告)号：US09843411B2

公开(公告)日：2017-12-12

申请号：US15132990

申请日：2016-04-19

Applicant: QUALCOMM Incorporated

Inventor： Qinghai Gao ,  Nathaniel David Houghton ,  Ahmed Ragab Elsherif ,  Ehab Tahir

IPC: H04L1/00 ,  H04B7/0452 ,  H04W72/08

CPC classification number: H04L1/0003 ,  H04B7/0452 ,  H04L1/003 ,  H04W72/085

Abstract: Wireless node selects modulation coding schemes (MCS) and number of spatial streams for transmitting data to devices via a MU-MIMO transmission based on the total number of spatial streams. In one implementation, a wireless node selects first MCS, first number of spatial stream(s) for a first device, and total number of spatial streams to be used in the MU-MIMO transmission so as to maximize the data rate to the first device, then selects a second MCS and a second number of spatial stream(s) for a second device based on the selected total number of spatial streams. In another implementation, the wireless node toggles the first selection of the MCS and spatial stream(s) between the first and second devices for fairness purposes. In another implementation, a wireless selects the MCS and the spatial streams for the receiving nodes so as to maximize the aggregate data rate for the MU-MIMO transmission.

公开(公告)号：US09655135B2

公开(公告)日：2017-05-16

申请号：US14731120

申请日：2015-06-04

Applicant: QUALCOMM Incorporated

Inventor： Ahmed Ragab Elsherif ,  Qinghai Gao

IPC: H04B7/04 ,  H04W72/12 ,  H04W72/04 ,  H04B7/0452

CPC classification number: H04W72/121 ,  H04B7/0452 ,  H04W72/046

Abstract: Certain aspects of the present disclosure relate to a robust and systematic multi-user (MU) grouping and scheduling scheme. Certain aspects of the present disclosure provide an apparatus for wireless communications. The apparatus generally includes a processing system configured to: assign devices to one or more groups, wherein each group has at least a number of devices and schedule MU multiple-input multiple-output (MIMO) transmissions to one or more sets of devices, each scheduled set of devices comprising a subset of devices of one of the groups; and an interface configured to output data for simultaneous transmissions to the scheduled sets of devices.

公开(公告)号：US09379794B2

公开(公告)日：2016-06-28

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: H04B7/04 ,  H04W72/12

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：US20160142232A1

公开(公告)日：2016-05-19

申请号：US14542464

申请日：2014-11-14

Applicant: QUALCOMM Incorporated

Inventor： Qinghai Gao ,  Xiaolong Huang ,  Vincent Knowles Jones, IV ,  Srinivas Katar ,  James Simon Cho

IPC: H04L27/00

CPC classification number: H04L27/0008 ,  H04L1/0003 ,  H04L1/0007 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/1614

Abstract: Methods, systems, and devices are described for wireless communications. More particularly, the described features relate to techniques for adjusting a modulation and coding scheme (MCS) to account for different airtime utilizations (available airtime actually utilized by a device for transmissions) resulting from different MCSs. In one example, a method for wireless communication may involve: determining a media access control (MAC) efficiency for a station of a plurality of stations based at least in part on a real-time multi-user (MU) physical protocol data unit (PPDU) length, a real-time physical layer service data unit (PSDU) length of each of the plurality of stations, and a modulation and coding scheme (MCS) of the station; adjusting a goodput estimate of the station using the MAC efficiency; and, adjusting the MCS of the station using the adjusted goodput estimate.

Abstract translation: 描述了用于无线通信的方法，系统和设备。 更具体地，所描述的特征涉及用于调整调制和编码方案（MCS）以考虑由不同MCS产生的不同通话时间利用率（由设备实际用于传输的可用空闲时间）的技术。 在一个示例中，用于无线通信的方法可以包括：至少部分地基于实时多用户（MU）物理协议数据单元（MU）来确定多个站的站的媒体访问控制（MAC）效率 PPDU）长度，多个站中的每一个的实时物理层服务数据单元（PSDU）长度，以及站的调制和编码方案（MCS）; 使用MAC效率调整车站的有用估计; 并且使用经调整的输入估计来调整站的MCS。

公开(公告)号：US20140219110A1

公开(公告)日：2014-08-07

申请号：US13762338

申请日：2013-02-07

Applicant: QUALCOMM INCORPORATED

Inventor： Shu Du ,  Zhanfeng Jia ,  Ning Zhang ,  Chin-Hung Chen ,  James S. Cho ,  Rahul Tandra ,  Qinghai Gao

IPC: H04W24/02

CPC classification number: H04W24/02 ,  H04B7/0452 ,  H04L1/0007

Abstract: A method of providing aggregated MAC protocol data unit (AMPDU) duration control in a wireless communication device includes setting an AMPDU duration. Pass/fail statistics are collected for each MPDU of an AMPDU in a time window, W. A packet error rate (PER) difference is calculated between first and last sets of MPDUs for each AMPDU in the window. An average PER difference is calculated across all AMPDUs in the window. When the average PER difference is greater than a first threshold, then the AMPDU duration is decreased. When the difference is less than a second threshold, then the AMPDU duration is increased. When the difference is within the first and the second thresholds, then the method returns to the step of collecting for a next time window. The AMPDU duration can also be adjusted based on detected Doppler and line-of-sight transmissions.

Abstract translation: 在无线通信设备中提供聚合MAC协议数据单元（AMPDU）持续时间控制的方法包括设置AMPDU持续时间。 在时间窗口W中收集AMPDU的每个MPDU的通过/失败统计信息。在窗口中的每个AMPDU的第一组和最后一组MPDU之间计算分组错误率（PER）差异。 在窗口中的所有AMPDU之间计算平均PER差异。 当平均PER差大于第一阈值时，AMPDU持续时间减小。 当差值小于第二阈值时，AMPDU持续时间增加。 当差异在第一和第二阈值内时，该方法返回到下一个时间窗口的收集步骤。 AMPDU持续时间也可以根据检测到的多普勒和视线传输进行调整。

公开(公告)号：US09860761B2

公开(公告)日：2018-01-02

申请号：US15141370

申请日：2016-04-28

Applicant: QUALCOMM Incorporated

Inventor： Ahmed Ragab Elsherif ,  Qinghai Gao ,  Eugene Baik

IPC: H04B7/0456 ,  H04W16/28 ,  H04B7/0452 ,  H04L5/00 ,  H04B7/0417

CPC classification number: H04W16/28 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0456 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/006

Abstract: Methods, systems, and devices are described for wireless communication. In one aspect, a method of wireless communication includes receiving, by a wireless device, beamforming information from a plurality of stations. The beamforming information includes feedback signal-to-noise ratio (SNR) values and beamforming feedback matrices. The method further includes determining a metric associated with a candidate group of the plurality of stations based at least in part on the received feedback SNR values and the received beamforming feedback matrices. The metric indicates a correlation between spatial streams of multi-user multiple-input-multiple-output (MU-MIMO) transmissions intended for the stations of the candidate group.

公开(公告)号：US20160338080A1

公开(公告)日：2016-11-17

申请号：US14847551

申请日：2015-09-08

Applicant: QUALCOMM Incorporated

Inventor： Qinghai Gao ,  Ahmed Ragab Elsherif ,  Xiaolong Huang ,  Guido Robert Frederiks ,  Chao Zou

IPC: H04W72/12 ,  H04B7/04 ,  H04L12/26

CPC classification number: H04W72/121 ,  H04B7/0452 ,  H04L43/0852 ,  H04L47/125 ,  H04L47/50 ,  H04W4/08 ,  H04W28/08 ,  H04W72/00

Abstract: Methods, systems, and devices are described for wireless communication. In one aspect, a method of wireless communication includes determining a transmit time metric associated with each transmission group of a number of transmission groups based at least in part on an amount of data in a transmit queue and a modulation and coding scheme (MCS) data rate for at least one wireless communication device in the transmission group. The method also includes scheduling a transmission to a first transmission group of the number of transmission groups based at least in part on the transmit time metric for the first transmission group.

Abstract translation: 描述了用于无线通信的方法，系统和设备。 一方面，一种无线通信方法包括至少部分地基于发送队列中的数据量和调制和编码方案（MCS）数据来确定与多个传输组的每个传输组相关联的传输时间度量 传输组中的至少一个无线通信设备的速率。 该方法还包括至少部分地基于第一传输组的传输时间度量来调度对传输组数量的第一传输组的传输。

公开(公告)号：US20160142176A1

公开(公告)日：2016-05-19

申请号：US14542461

申请日：2014-11-14

Applicant: QUALCOMM INCORPORATED

Inventor： Qinghai Gao ,  Xialong Huang ,  Vincent Knowles Jones, IV ,  Srinivas Katar ,  James Simon Cho

IPC: H04L1/00 ,  H04L1/16 ,  H04L12/26 ,  H04W24/08

CPC classification number: H04L1/0003 ,  H04L1/0001 ,  H04L1/0005 ,  H04L1/1621 ,  H04L43/0847 ,  H04W24/08

Abstract: Methods, apparatus, and computer-readable media for wireless communication by an access point (AP) may involve communicating with a station using a first modulation and coding scheme (MCS). An under-utilization of a medium access control (MAC) protocol data unit (MPDU) aggregation of the station while using the first MCS may be identified. The under-utilization may be caused by packet error rate (PER)-induced head of line (HOL) blocking. The MCS may be switched to a second MCS that is lower than the first MCS.

Abstract translation: 用于由接入点（AP）进行无线通信的方法，装置和计算机可读介质可以涉及使用第一调制和编码方案（MCS）与站通信。 可以识别在使用第一MCS时站的媒体访问控制（MAC）协议数据单元（MPDU）聚合的不充分利用。 利用不足可能是由分组错误率（PER）引起的线路头（HOL）阻塞引起的。 MCS可以切换到低于第一MCS的第二MCS。

公开(公告)号：US20140269962A1

公开(公告)日：2014-09-18

申请号：US13830881

申请日：2013-03-14

Applicant: QUALCOMM INCORPORATED

Inventor： Qinghai Gao ,  Balaji Srinivasan Babu ,  Guido R. Frederiks ,  James S. Cho ,  Shu Du

IPC: H04B7/04

CPC classification number: H04B7/0413 ,  H04B7/0452 ,  H04L1/00 ,  H04L1/0026 ,  H04L1/06 ,  H04L1/1614 ,  H04L1/1628 ,  H04L1/1887 ,  H04W28/0231 ,  H04W72/1226 ,  H04W72/1231 ,  H04W72/1263

Abstract: Systems and methods are disclosed for scheduling SU and MU traffic in a MIMO communications system. Net goodput may be estimated for a station using a plurality of MIMO modes and a transmission to the station may be scheduled using one of the MIMO modes based, at least in part, on the estimated net goodput. Estimating net goodput may include determining a number of bits that may be successfully transmitted to the station using the MIMO mode divided by a time required to transmit the number of bits plus the sounding time. Further, the number of bits that may be successfully transmitted to the station may be based on the number of packets that may be delivered over the upcoming sounding interval and statistically determined goodput for each MIMO mode.

Abstract translation: 公开了用于在MIMO通信系统中调度SU和MU业务的系统和方法。 可以针对使用多个MIMO模式的站估计净有效吞吐量，并且可以至少部分地基于估计的净功率输出，使用MIMO模式之一来调度到站的传输。 估计净有效吞吐量可以包括使用MIMO模式除以传送比特数加上探测时间所需的时间来确定可以成功发送到站的比特数。 此外，可以成功发送到站的比特数可以基于可以通过即将到来的探测间隔递送的分组的数量，以及针对每个MIMO模式的统计确定的输出。

公开(公告)号：US20140269961A1

公开(公告)日：2014-09-18

申请号：US13830177

申请日：2013-03-14

Applicant: QUALCOMM INCORPORATED

Inventor： Qinghai Gao ,  Balaji Srinivasan Babu ,  Shu Du

IPC: H04L1/00

CPC classification number: H04L1/0027 ,  H04L25/0224

Abstract: Systems and methods are disclosed for optimizing the sounding interval in a MIMO communications system. Following a channel sounding protocol, net throughput may be estimated over time. The sounding interval may correspond to the period of time between the end of the sounding protocol and a time when the estimated net throughput is maximized. Estimating net throughput may involve estimating the number of bits that may be successfully transmitted divided by the time required to transmit. The number of bits that may be successfully transmitted may be estimated from a statistical channel profile including goodput.

Abstract translation: 公开了用于优化MIMO通信系统中的探测间隔的系统和方法。 根据频道侦听协议，可以估计随时间的净吞吐量。 探测间隔可以对应于探测协议结束与估计净吞吐量最大化的时间之间的时间段。 估计净吞吐量可以包括估计可以成功发送的比特数除以发送所需的时间。 可以从包括有效输出的统计信道简档估计可以成功发送的比特数。