公开(公告)号：US20060256761A1

公开(公告)日：2006-11-16

申请号：US11128843

申请日：2005-05-12

申请人： Arnaud Meylan ,  Santosh Abraham ,  Sanjiv Nanda

发明人： Arnaud Meylan ,  Santosh Abraham ,  Sanjiv Nanda

IPC分类号： H04Q7/24

CPC分类号： H04B7/0417 ,  H04B7/0421 ,  H04B7/0632 ,  H04B7/0643 ,  H04L1/0002 ,  H04L1/0015 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/06 ,  H04L1/1671 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/0398 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Techniques for selecting rates for data transmission on eigenmodes of a MIMO channel are described. An access point transmits an unsteered MIMO pilot via the downlink. A user terminal estimates the downlink channel quality based on the downlink unsteered MIMO pilot and transmits an unsteered MIMO pilot and feedback information via the uplink. The feedback information is indicative of the downlink channel quality. The access point estimates the uplink channel quality and obtains a channel response matrix based on the uplink unsteered MIMO pilot, decomposes the channel response matrix to obtain eigenvectors and channel gains for the eigenmodes of the downlink, and selects rates for the eigenmodes based on the estimated uplink channel quality, the channel gains for the eigenmodes, and the feedback information. The access point processes data based on the selected rates and transmits steered data and a steered MIMO pilot on the eigenmodes with the eigenvectors.

公开(公告)号：US20080205340A1

公开(公告)日：2008-08-28

申请号：US11680455

申请日：2007-02-28

申请人： Arnaud Meylan ,  Santosh Abraham ,  Shravan K. Surineni ,  Sanjiv Nanda

发明人： Arnaud Meylan ,  Santosh Abraham ,  Shravan K. Surineni ,  Sanjiv Nanda

IPC分类号： H04Q7/00

CPC分类号： H04W8/005 ,  H04W48/12 ,  H04W48/18 ,  H04W52/0216 ,  H04W92/20 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/22

摘要： Beacons may be grouped to facilitate neighbor discovery in a wireless network. For example, neighboring access devices such as IEEE 802.11 access points may cooperate to transmit beacons in a group. In this way, a wireless device seeking to discover the neighboring access devices may scan for the beacons for a shorter period of time. An indication may be provided to enable a wireless device to more efficiently scan the beacons. For example, the indication may indicate the channel the wireless device should scan to receive the next beacon that is to be transmitted. In addition, the indication may include information relating to the transmission time of the next beacon.

摘要翻译： 信标可以被分组以便于无线网络中的邻居发现。 例如，诸如IEEE 802.11接入点之类的相邻接入设备可以协作来传送组中的信标。 以这种方式，寻求发现相邻接入设备的无线设备可以在更短的时间段内扫描信标。 可以提供指示以使得无线设备能够更有效地扫描信标。 例如，该指示可以指示无线设备应扫描的频道以接收将被发送的下一个信标。 此外，该指示可以包括与下一个信标的发送时间有关的信息。

公开(公告)号：US07872981B2

公开(公告)日：2011-01-18

申请号：US11128843

申请日：2005-05-12

申请人： Arnaud Meylan ,  Santosh Abraham ,  Sanjiv Nanda

发明人： Arnaud Meylan ,  Santosh Abraham ,  Sanjiv Nanda

IPC分类号： G01R31/08 ,  H04W4/00 ,  H03B1/02 ,  H04B17/00

CPC分类号： H04B7/0417 ,  H04B7/0421 ,  H04B7/0632 ,  H04B7/0643 ,  H04L1/0002 ,  H04L1/0015 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/06 ,  H04L1/1671 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/0398 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Techniques for selecting rates for data transmission on eigenmodes of a MIMO channel are described. An access point transmits an unsteered MIMO pilot via the downlink. A user terminal estimates the downlink channel quality based on the downlink unsteered MIMO pilot and transmits an unsteered MIMO pilot and feedback information via the uplink. The feedback information is indicative of the downlink channel quality. The access point estimates the uplink channel quality and obtains a channel response matrix based on the uplink unsteered MIMO pilot, decomposes the channel response matrix to obtain eigenvectors and channel gains for the eigenmodes of the downlink, and selects rates for the eigenmodes based on the estimated uplink channel quality, the channel gains for the eigenmodes, and the feedback information. The access point processes data based on the selected rates and transmits steered data and a steered MIMO pilot on the eigenmodes with the eigenvectors.

摘要翻译： 描述了用于选择MIMO信道的本征模式上的数据传输速率的技术。 接入点经由下行链路发送非导向MIMO导频。 用户终端基于下行链路非导向MIMO导频来估计下行链路信道质量，并通过上行链路发送非导向MIMO导频和反馈信息。 反馈信息表示下行链路信道质量。 接入点估计上行链路信道质量，并且基于上行链路非导向MIMO导频获得信道响应矩阵，分解信道响应矩阵以获得用于下行链路本征模式的特征向量和信道增益，并且基于所估计的本征模式选择本征模式的速率 上行链路信道质量，本征模式的信道增益和反馈信息。 接入点基于所选择的速率处理数据，并在本征矢量的本征模式上传输转向数据和转向MIMO导频。

公开(公告)号：US09198194B2

公开(公告)日：2015-11-24

申请号：US13440666

申请日：2012-04-05

申请人： Arnaud Meylan ,  Sanjiv Nanda

发明人： Arnaud Meylan ,  Sanjiv Nanda

IPC分类号： H04B1/14 ,  H04W74/06 ,  H04W72/04 ,  H04W72/14

CPC分类号： H04W72/04 ,  H04W72/0406 ,  H04W72/14 ,  H04W74/06

摘要： Systems and methodologies are described that facilitate increased communication channel bandwidth efficiency in association with scheduled time periods that allocate channel access to particular stations. According to various aspects, systems and methods are described that facilitate providing and/or utilizing reverse direction grants in connection with scheduled channel access. Such systems and/or method can mitigate an amount of unused channel access time after a station completes data transmission prior to an end of the allocated period.

摘要翻译： 描述了与分配对特定站的信道访问的调度时间段相关联的促进增加的通信信道带宽效率的系统和方法。 根据各个方面，描述了有助于提供和/或利用与调度的信道接入有关的反向授权的系统和方法。 这样的系统和/或方法可以在站在分配的周期结束之前完成数据传输之后减轻未使用的信道访问时间量。

公开(公告)号：US09191226B2

公开(公告)日：2015-11-17

申请号：US12439059

申请日：2007-09-28

申请人： Manoj M. Deshpande ,  Arnaud Meylan ,  Ranjith S. Jayaram ,  Sanjiv Nanda ,  Alok Aggarwal

发明人： Manoj M. Deshpande ,  Arnaud Meylan ,  Ranjith S. Jayaram ,  Sanjiv Nanda ,  Alok Aggarwal

IPC分类号： H04L12/26

CPC分类号： H04L12/2697 ,  H04L43/50

摘要： Methods and apparatus for determining the quality of a communication link transmitting a specified packet type are disclosed. The methodology includes configuring first packets, which share transmission characteristics with a specific packet type, such as a Voice over IP packet, such that the first packets experience similar communication link treatment as the specific packet type. The first packets are then transmitted over the communication link to a quality monitoring server located near a termination equipment of the particular communication link. Second packets, which are transmitted by the server in response to the first packets, are received and evaluated to determine the quality of the communication link based on characteristics of the second packets. Corresponding apparatus are also disclosed.

摘要翻译： 公开了用于确定发送指定分组类型的通信链路的质量的方法和装置。 该方法包括配置与特定分组类型（例如IP语音分组）共享传输特性的第一分组，使得第一分组经历与特定分组类型类似的通信链路处理。 然后，第一个分组通过通信链路发送到位于特定通信链路的终端设备附近的质量监视服务器。 接收并评估由服务器响应于第一分组而发送的第二分组，以基于第二分组的特性来确定通信链路的质量。 还公开了相应的装置。

公开(公告)号：US08665795B2

公开(公告)日：2014-03-04

申请号：US13277450

申请日：2011-10-20

申请人： John W Ketchum ,  Sanjiv Nanda ,  Arnaud Meylan ,  Shravan K Surineni

发明人： John W Ketchum ,  Sanjiv Nanda ,  Arnaud Meylan ,  Shravan K Surineni

IPC分类号： H04Q7/00

CPC分类号： H04B7/0643 ,  H04B7/0421 ,  H04B7/0617 ,  H04B7/0634 ,  H04B7/0636 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Techniques to support beamforming for stations in a wireless network are described. A station may support beamforming with implicit or explicit feedback by having capabilities to transmit and receive sounding frames, responding to training request by sending a sounding frame, and responding to request for explicit feedback. In one explicit beamforming embodiment, the station may send a first frame with an explicit feedback request and may also send a Null Data Packet (NDP) having at least one training field but no data field. The station may receive a second frame with explicit feedback, which may be derived based on the NDP. The station may derive steering information based on explicit feedback and may then send a steered frame with beamforming based on steering information. Other aspects, embodiments, and features are also claimed and described.

摘要翻译： 描述了支持无线网络中的站的波束成形的技术。 站可以通过具有发送和接收探测帧的能力来支持具有隐式或显式反馈的波束成形，通过发送探测帧来响应训练请求，以及响应对显式反馈的请求。 在一个明确的波束形成实施例中，站可以发送具有显式反馈请求的第一帧，并且还可以发送具有至少一个训练场但不包括数据字段的空数据分组（NDP）。 该站可以接收具有显式反馈的第二帧，其可以基于NDP导出。 该站可以基于显式反馈导出转向信息，然后可以基于转向信息发送具有波束成形的转向帧。 还要求和描述其它方面，实施例和特征。

公开(公告)号：US08483105B2

公开(公告)日：2013-07-09

申请号：US10964321

申请日：2004-10-13

申请人： Sanjiv Nanda ,  Arnaud Meylan ,  Jay Rodney Walton

发明人： Sanjiv Nanda ,  Arnaud Meylan ,  Jay Rodney Walton

IPC分类号： H04B7/005

CPC分类号： H04L29/06068 ,  H04L1/0025 ,  H04L1/0073 ,  H04L1/0078 ,  H04L1/0618 ,  H04L1/1621 ,  H04L1/1671 ,  H04L12/403 ,  H04L12/4633 ,  H04L29/06 ,  H04L69/08 ,  H04L69/24 ,  H04W28/04 ,  H04W28/06 ,  H04W48/08 ,  H04W52/383 ,  H04W74/06

摘要： Embodiments disclosed herein for MAC processing for efficient use of high throughput systems and that may be backward compatible with various types of legacy systems. In one aspect, a data transmission structure comprises a consolidated poll and one or more frames transmitted in accordance with the consolidated poll. In another aspect, a Time Division Duplexing (TDD) data transmission structure comprises a pilot, a consolidated poll, and zero or more access point to remote station frames in accordance with the consolidated poll. In one aspect, frames are transmitted sequentially with no or substantially reduced interframe spacing. In another aspect, a guard interframe spacing may be introduced between frames transmitted from different sources, or with substantially different power levels. In another aspect, a single preamble is transmitted in association with one or more frames. In another aspect, a block acknowledgement is transmitted subsequent to the transmission of one or more sequential frames.

公开(公告)号：US08274956B2

公开(公告)日：2012-09-25

申请号：US11680400

申请日：2007-02-28

申请人： Arnaud Meylan ,  Manoj M. Deshpande ,  Sanjiv Nanda

发明人： Arnaud Meylan ,  Manoj M. Deshpande ,  Sanjiv Nanda

IPC分类号： H04W4/00

CPC分类号： H04W72/005 ,  H04W52/0216 ,  H04W52/0219 ,  H04W88/02 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/22 ,  Y02D70/23 ,  Y02D70/26

摘要： Broadcast or multicast traffic is classified into different types of traffic such that different types of traffic are transmitted over different sub-networks. In addition, different transmission schedules may be associated with each of the different sub-networks. A device may thus be configured to receive only a selected portion of the different types of traffic by only waking from a power save mode at the intervals at which the corresponding sub-network sends the traffic. The standby time of the wireless station may thus be improved because the wireless station may awaken less frequently and for shorter periods of time. Different sub-networks carrying different types of broadcast and multicast traffic may be implemented in an 802.11-based system. For example, a single access point may define multiple basic service set identifiers for a single wireless channel.

摘要翻译： 广播或多播流量分为不同类型的流量，使得不同类型的流量在不同的子网络上传输。 此外，不同的传输时间表可以与每个不同的子网络相关联。 因此，设备可以被配置为仅以相应的子网络发送业务的间隔从省电模式唤醒来仅接收不同类型业务的所选部分。 因此，无线站的待机时间可以被改善，因为无线站可以较少地频繁地唤醒并且在较短的时间段内唤醒。 承载不同类型的广播和多播业务的不同子网络可以在基于802.11的系统中实现。 例如，单个接入点可以为单个无线信道定义多个基本服务集标识符。

公开(公告)号：US20070298742A1

公开(公告)日：2007-12-27

申请号：US11768329

申请日：2007-06-26

申请人： John W. Ketchum ,  Sanjiv Nanda ,  Arnaud Meylan ,  Shravan K. Surineni

发明人： John W. Ketchum ,  Sanjiv Nanda ,  Arnaud Meylan ,  Shravan K. Surineni

IPC分类号： H04B1/18

CPC分类号： H04B7/0643 ,  H04B7/0421 ,  H04B7/0617 ,  H04B7/0634 ,  H04B7/0636 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Techniques to support beamforming for stations in a wireless network are described. In one aspect, a station may support beamforming with implicit feedback or explicit feedback by having capabilities to transmit and receive sounding frames, respond to training request by sending a sounding frame, and respond to request for explicit feedback. In one design of explicit beamforming, the station may send a first frame with a request for explicit feedback and may also send a Null Data Packet (NDP) having at least one training field but no data field. The station may receive a second frame with the explicit feedback, which may be derived based on the NDP. The station may derive steering information (e.g., steering matrices) based on the explicit feedback and may then send a steered frame with beamforming based on the steering information. The station may also perform implicit beamforming using NDP for sounding.

摘要翻译： 描述了支持无线网络中的站的波束成形的技术。 在一个方面，站可以通过具有发送和接收探测帧的能力来支持具有隐式反馈或显式反馈的波束成形，通过发送探测帧来响应训练请求，以及响应对显式反馈的请求。 在显式波束形成的一种设计中，站可以发送具有对显式反馈的请求的第一帧，并且还可以发送具有至少一个训练场但不包括数据场的空数据分组（NDP）。 该站可以接收具有显式反馈的第二帧，其可以基于NDP导出。 基站可以基于显式反馈导出转向信息（例如，导引矩阵），然后可以基于转向信息发送具有波束成形的转向帧。 该站还可以使用NDP进行声音执行隐式波束成形。

公开(公告)号：US20070297438A1

公开(公告)日：2007-12-27

申请号：US11680302

申请日：2007-02-28

申请人： Arnaud Meylan ,  Manoj Deshpande ,  Sanjiv Nanda

发明人： Arnaud Meylan ,  Manoj Deshpande ,  Sanjiv Nanda

IPC分类号： H04L12/413

CPC分类号： H04W52/0225 ,  H04W52/0216 ,  H04W84/12 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/146 ,  Y02D70/23

摘要： Techniques to improve the standby time of a station in a wireless network are described. An access point may advertise or convey a maximum listen interval and/or an association timeout supported by that access point. A station may operate in a power-save mode and may wake up every listen interval to receive a beacon and any potential traffic for the station. The station may select a suitable listen interval based on the maximum listen interval. The station may be dormant for a longer duration than the listen interval and may become active at least once in every association timeout in order to keep the association with the access point alive. The access point may also send broadcast and multicast traffic that might be of interest to stations in the power-save mode less frequently and using a special indication message.

摘要翻译： 描述了改善无线网络中的站的待机时间的技术。 接入点可以通告或传达由该接入点支持的最大监听间隔和/或关联超时。 站可以在省电模式下操作，并且可以在每个监听间隔中唤醒以接收该信标和该站的任何潜在业务。 该站可以基于最大监听间隔来选择合适的监听间隔。 该站可以比监听间隔更长的持续时间休眠，并且可以在每个关联超时中至少活动一次，以便保持与接入点的关联。 接入点还可以频发地发送节电模式中的站可能感兴趣的广播和组播流量，并使用特殊的指示消息。