公开(公告)号：US20050169186A1

公开(公告)日：2005-08-04

申请号：US10880960

申请日：2004-06-30

申请人： Lili Qiu ,  Paramvir Bahl ,  Lidong Zhou ,  Ananth Rao

发明人： Lili Qiu ,  Paramvir Bahl ,  Lidong Zhou ,  Ananth Rao

IPC分类号： H04L12/24 ,  H04L12/26

CPC分类号： H04L41/145 ,  H04L41/046 ,  H04L41/0631 ,  H04L41/069 ,  H04L41/147

摘要： A network troubleshooting framework is described. In an implementation, a method includes generating a first estimation of network performance by a simulator based on network settings obtained from a network, estimating the new performance under an alternative setting by providing the alternative setting to the network simulation and observing the simulation output, repeating the procedure for other alternative settings, and suggesting the alternative setting that improves network performance.

摘要翻译： 描述了网络故障排除框架。 在实现中，一种方法包括基于从网络获得的网络设置来生成模拟器对网络性能的第一估计，通过向网络模拟提供备选设置并观察模拟输出，重复地在另一设置下估计新的性能 其他替代设置的过程，并提出改进网络性能的替代设置。

公开(公告)号：US20050169185A1

公开(公告)日：2005-08-04

申请号：US10881695

申请日：2004-06-30

申请人： Lili Qiu ,  Paramvir Bahl ,  Lidong Zhou ,  Ananth Rao

发明人： Lili Qiu ,  Paramvir Bahl ,  Lidong Zhou ,  Ananth Rao

IPC分类号： H04L12/24 ,  H04L12/26

CPC分类号： H04L41/145 ,  H04L41/12 ,  H04L41/142 ,  H04L43/08 ,  H04L43/0829

摘要： A network troubleshooting framework is described. In an implementation, a method includes detecting discrepancy in operation of a network by supplying data that describes the network to a network simulation so that the network simulation provides an estimation of network performance. A determination is made as to whether the estimation of network performance differs from observed network performance of the network. A root cause of the discrepancy id diagnosed by injecting one or more of a plurality of faults into the network simulation until the estimation of network performance approximates the observed network performance.

摘要翻译： 描述了网络故障排除框架。 在实现中，一种方法包括通过向网络仿真提供描述网络的数据来检测网络的操作差异，使得网络仿真提供对网络性能的估计。 确定网络性能的估计是否与网络的观察网络性能不同。 通过将多个故障中的一个或多个注入到网络仿真中诊断的差异id的根本原因，直到网络性能的估计近似于观察到的网络性能。

公开(公告)号：US20050149764A1

公开(公告)日：2005-07-07

申请号：US11072039

申请日：2005-03-04

申请人： Paramvir Bahl ,  Allen Miu

发明人： Paramvir Bahl ,  Allen Miu

IPC分类号： H04L12/28 ,  H04L12/56 ,  H04L29/06 ,  G06F11/30

CPC分类号： H04W48/08 ,  H04L63/04 ,  H04L63/08 ,  H04L63/102 ,  H04W8/26 ,  H04W12/06 ,  H04W48/16 ,  H04W48/18

摘要： Systems and methods are described for managing network connectivity for mobile users, particularly when a mobile user roams between two networks or between two subnets of a network. An announcer signal is broadcast by a host organization. The announcer signal includes a network identifier, an authorizer address and a verifier address. A mobile client monitors for the announcer signal and, when detected, provides an option to connect to the network via the authorizer. Once authorization is obtained, the mobile client communicates with the network through the verifier. The verifier received tagged data packets from a mobile client and only accepts the data packets if a valid tag (created with an authorization key) is included therewith. Multiple verifiers may be used to provide load balancing and fault tolerance (in the event a verifier fails). If a mobile client disconnects from a network and later reconnects, the mobile client does not have to be re-authorized if the mobile client still has a valid authorization key.

摘要翻译： 描述了用于管理移动用户的网络连接的系统和方法，特别是当移动用户在两个网络之间漫游或网络的两个子网之间漫游时。 播音员信号由主机组织广播。 播音员信号包括网络标识符，授权者地址和验证者地址。 移动客户端监视播音员信号，并且在被检测时提供通过授权器连接到网络的选项。 一旦获得授权，移动客户端将通过验证者与网络进行通信。 验证者接收到来自移动客户端的标签数据包，并且只有在包含有效标签（用授权密钥创建）时才接收数据包。 可以使用多个验证器来提供负载平衡和容错（在验证者失败的情况下）。 如果移动客户端与网络断开连接并且稍后重新连接，则如果移动客户端仍然具有有效的授权密钥，则不需要重新授权移动客户端。

公开(公告)号：US20050096068A1

公开(公告)日：2005-05-05

申请号：US10988904

申请日：2004-11-15

申请人： Paramvir Bahl ,  Venkata Padmanabhan

发明人： Paramvir Bahl ,  Venkata Padmanabhan

IPC分类号： G01S5/02 ,  G01S19/02 ,  G01S19/06 ,  H04L12/28 ,  H04L12/56 ,  H04W24/00 ,  H04W64/00 ,  H04W88/08 ,  H04Q7/20

CPC分类号： H04W64/00 ,  G01C21/206 ,  G01S5/0252 ,  G01S11/06 ,  H04W24/00 ,  H04W88/08

摘要： A method for locating a user in a wireless network is disclosed. A mobile computer seeking to determine its location within a building detects the signal strength of one or more wireless base stations placed at known locations throughout the building. The mobile computer uses this measured signal strength to determine its location via a signal-strength-to-location table look-up. A table of known locations within the building and the base station signal strength at those locations is searched to find the most similar stored signal strength to the signal strength detected. The location corresponding to the most similar stored signal strength is determined to be the current location of the mobile computer. Alternatively, a number of signal strengths from the table can be used and the corresponding locations can be spatially averaged to determine the location of the mobile computer. The table can be derived empirically, by placing a mobile computer at the known locations and detecting the signal strength of the wireless base stations at those locations, or the table can be derived mathematically by taking into account a reference signal strength, the distance between the reference point and the known location, and the number of walls between the reference point and the known location. As an alternative, the base stations can detect the signal strength of the mobile computer. In such a case, the table would relate a known position of the mobile computer to the signal strength of the mobile computer at that location as detected by the one or more base stations.

公开(公告)号：US20050085241A1

公开(公告)日：2005-04-21

申请号：US10973110

申请日：2004-10-25

申请人： Paramvir Bahl ,  Joshua Broch

发明人： Paramvir Bahl ,  Joshua Broch

IPC分类号： G01S19/03 ,  H04W4/02 ,  H04W4/04 ,  H04W8/10 ,  H04W8/14 ,  H04W84/12 ,  H04W84/22 ,  H04Q7/20

CPC分类号： H04W4/02 ,  H04W4/04 ,  H04W8/10 ,  H04W8/14 ,  H04W84/12 ,  H04W84/22 ,  Y10S707/99953

摘要： Methods, systems and data structure for storing and managing information in a wireless network are described wherein fixed resources in the system are stored in a database in a hierarchical directory structure according to the location of each fixed resource. Each level of the directory structure represents a geographical area in which a fixed resource is located. A mobile user submits a query for the location of the nearest fixed resource having certain properties. The system determines the location of the mobile user and then searches the database for the requested fixed resource that is nearest to the mobile user. When the fixed resource is identified, data regarding its location is transmitted to the mobile user. In addition, specific directions as to how to get to the location of the fixed resource from the location of the mobile user may be provided.

公开(公告)号：US06839560B1

公开(公告)日：2005-01-04

申请号：US09513155

申请日：2000-02-25

申请人： Paramvir Bahl ,  Venkata N. Padmanabhan

发明人： Paramvir Bahl ,  Venkata N. Padmanabhan

IPC分类号： G01S5/02 ,  G01S19/02 ,  G01S19/06 ,  H04L12/28 ,  H04L12/56 ,  H04W24/00 ,  H04W64/00 ,  H04W88/08 ,  H04Q7/20 ,  G01S3/02 ,  H04M11/00

CPC分类号： H04W64/00 ,  G01C21/206 ,  G01S5/0252 ,  G01S11/06 ,  H04W24/00 ,  H04W88/08

摘要： A method for locating a user in a wireless network is disclosed. A mobile computer seeking to determine its location within a building detects the signal strength of one or more wireless base stations placed at known locations throughout the building. The mobile computer uses this measured signal strength to determine its location via a signal-strength-to-location table look-up. A table of known locations within the building and the base station signal strength at those locations is searched to find the most similar stored signal strength to the signal strength detected. The location corresponding to the most similar stored signal strength is determined to be the current location of the mobile computer. Alternatively, a number of signal strengths from the table can be used and the corresponding locations can be spatially averaged to determine the location of the mobile computer. The table can be derived empirically, by placing a mobile computer at the known locations and detecting the signal strength of the wireless base stations at those locations, or the table can be derived mathematically by taking into account a reference signal strength, the distance between the reference point and the known location, and the number of walls between the reference point and the known location. As an alternative, the base stations can detect the signal strength of the mobile computer. In such a case, the table would relate a known position of the mobile computer to the signal strength of the mobile computer at that location as detected by the one or more base stations.

摘要翻译： 公开了一种用于定位无线网络中的用户的方法。 寻求确定其在建筑物内的位置的移动计算机检测放置在整个建筑物的已知位置处的一个或多个无线基站的信号强度。 移动计算机使用该测量的信号强度来通过信号强度到位置表查找来确定其位置。 搜索建筑物内已知位置的表格以及那些位置处的基站信号强度，以找到与检测到的信号强度最相似的存储信号强度。 将与最相似的存储信号强度对应的位置确定为移动计算机的当前位置。 或者，可以使用来自表格的多个信号强度，并且可以在空间上平均对应的位置以确定移动计算机的位置。 通过将移动计算机置于已知位置并检测在那些位置处的无线基站的信号强度，该表可以凭经验得出，或者可以通过考虑参考信号强度，数学上的参考信号强度， 参考点和已知位置，以及参考点和已知位置之间的壁数。 作为替代，基站可以检测移动计算机的信号强度。 在这种情况下，该表将将移动计算机的已知位置与由一个或多个基站检测到的该位置处的移动计算机的信号强度相关联。

公开(公告)号：US06799047B1

公开(公告)日：2004-09-28

申请号：US09513355

申请日：2000-02-25

申请人： Paramvir Bahl ,  Venkata N. Padmanabhan

发明人： Paramvir Bahl ,  Venkata N. Padmanabhan

IPC分类号： H04Q720

CPC分类号： G01C21/206 ,  G01S5/0252

摘要： A method for locating a user in a wireless network is disclosed. A mobile computer which seeks to determine its location within a building detects the signal strength of one or more wireless base stations placed at known locations throughout the building. An environmentally profiled table of known locations within the building and the base station signal strength at those locations is searched to find the stored signal strength most similar to the signal strength detected. The location corresponding to the most similar stored signal strength is determined to be the current location of the mobile computer. The table can be derived empirically, by placing a mobile computer at the known locations and measuring the signal strength of the wireless base stations at those locations, or it can be derived mathematically by taking into account a reference signal strength, the distance between the reference point and the known location, and the number of intervening walls between the reference point and the known location. As an alternative, the base stations can measure the signal strength of the mobile computer. In such a case, the table would relate a known position of the mobile computer to the signal strength of the mobile computer as measured by the one or more base stations. Environmental profiling is achieved by comparing several different tables, corresponding to several different environments, and using the table that minimizes the error. Environmental profiling can be applied to tables determined empirically or mathematically.

摘要翻译： 公开了一种用于定位无线网络中的用户的方法。 寻求确定其在建筑物内的位置的移动计算机检测放置在整个建筑物的已知位置处的一个或多个无线基站的信号强度。 搜索建筑物内已知位置的环境分析表以及那些位置处的基站信号强度，以找到与检测到的信号强度最相似的存储信号强度。 将与最相似的存储信号强度对应的位置确定为移动计算机的当前位置。 通过将移动计算机置于已知位置并测量那些位置处的无线基站的信号强度，或者可以通过考虑参考信号强度，参考信号的距离 点和已知位置，以及参考点和已知位置之间的居间壁数。 作为替代，基站可以测量移动计算机的信号强度。 在这种情况下，该表将将移动计算机的已知位置与由一个或多个基站测量的移动计算机的信号强度相关联。 通过比较几个不同的表，对应于几个不同的环境，并使用最小化错误的表来实现环境分析。 环境分析可以应用于凭经验或数学确定的表。

公开(公告)号：US06664925B1

公开(公告)日：2003-12-16

申请号：US10137912

申请日：2002-05-02

申请人： Timothy M. Moore ,  Joseph Polastre ,  Warren Barkley ,  Paramvir Bahl

发明人： Timothy M. Moore ,  Joseph Polastre ,  Warren Barkley ,  Paramvir Bahl

IPC分类号： G01S302

CPC分类号： H04W64/00 ,  G01S5/02 ,  H04W4/021 ,  H04W4/043

摘要： A mobile computer establishes a wireless communication session with a wireless access point of a computer network. The location of each wireless access point is known and obtainable either from a database on the network or from the access points themselves. The strengths of wireless signals passing between the mobile computer and multiple wireless access points of the network, including the access point with which the mobile computer has established the session are measured at multiple time intervals. The measurements may be taken at the mobile computer itself or at the wireless access points. The measured strength values are then weighted according to such factors as whether the mobile computer has already established a communication session with the access point from which the sample was taken, and how old the sample is. For each location, the weighted strength values obtained for access points in that location are summed. The location having the highest sum is deemed to be the location of the mobile computer.

摘要翻译： 移动计算机与计算机网络的无线接入点建立无线通信会话。 每个无线接入点的位置是已知的，可以从网络上的数据库或从接入点本身获得。 在移动计算机与网络的多个无线接入点（包括移动计算机建立会话的接入点）之间传递的无线信号的强度是以多个时间间隔进行测量的。 测量可以在移动计算机本身或无线接入点进行。 然后根据诸如移动计算机是否已经建立了与其进行采样的接入点的通信会话以及样本多大的因素来加权测量的强度值。 对于每个位置，对该位置的接入点获得的加权强度值相加。 具有最高和的位置被认为是移动计算机的位置。

公开(公告)号：US06507587B1

公开(公告)日：2003-01-14

申请号：US09169583

申请日：1998-10-09

申请人： Paramvir Bahl

发明人： Paramvir Bahl

IPC分类号： H04B7212

CPC分类号： H04B7/2656

摘要： A slot assignment technique for assigning slots to a video communiction source in a slotted communication channel entails, in embodiments, using a slot from the channel to issue a coded request message containing a bit pattern indicative of a number of other slots that the video communication source requires for transmitting video information. At the receiver, the number of slots that the video communication source requires for transmitting video information is identified from the coded request via a lookup table. The requiste number of slots in the communication channel can then be allocated to the video commuinication source to transmit the video information. The bit pattern indicative of the number of slots that the video communication source requires generally comprises less data than would an uncoded request for the same number of slots. In this way, request limitations imposed by request slot size may be overcome.

摘要翻译： 在实施例中，用于将时隙分配给时隙通信信道中的视频通信源的时隙分配技术需要使用来自该信道的时隙来发出包含表示视频通信源的其他时隙数量的位模式的编码请求消息 需要传输视频信息。 在接收机处，通过查找表从编码的请求中识别视频通信源发送视频信息所需的时隙数。 然后可以将通信信道中所需的时隙数量分配给视频通信源以发送视频信息。 指示视频通信源所要求的时隙数量的比特模式通常包括比对相同数量的时隙的未编码请求少的数据。 以这种方式，可以克服请求时隙大小所引起的请求限制。

公开(公告)号：US06445701B1

公开(公告)日：2002-09-03

申请号：US09169418

申请日：1998-10-09

申请人： Paramvir Bahl

发明人： Paramvir Bahl

IPC分类号： H04J316

CPC分类号： H04W72/0446 ,  H04W28/20 ,  H04W74/04 ,  H04W76/10 ,  Y02D70/00

摘要： A full service channel access protocol that supports the integrated transport of voice, video and data communications is provided by dividing a communication channel into a plurality of frames, dividing each of the frames into a plurality of slots, and dividing some of the plurality of slots into a plurality of mini-slots. The mini-slots are provided for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel. Additionally, a second one of the plurality of slots is divided into a plurality of second mini-slots for use by the multiple communication sources to request the establishment of a new voice, data, or video transmission connection over the communication channel and for use by the multiple communication sources to augment an existing video connection over the communication channel. The method enables timely and power efficient communications over communication network.

摘要翻译： 通过将通信信道划分为多个帧，将每个帧划分为多个时隙，并分割多个时隙中的一些，提供支持语音，视频和数据通信的集成传输的全业务信道接入协议 成多个微型插槽。 微时隙被提供供多个通信源使用以请求通过通信信道建立新的语音，数据或视频传输连接。 另外，多个时隙中的第二个时隙被分成多个第二小时隙，供多个通信源使用，以通过通信信道请求建立新的语音，数据或视频传输连接，并由 该多个通信源用于通过通信信道增强现有的视频连接。 该方法能够通过通信网络实现及时和高效的通信。