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    Using a derived table of signal strength data to locate and track a user in a wireless network
    71.
    发明授权
    Using a derived table of signal strength data to locate and track a user in a wireless network 有权
    使用信号强度数据的派生表来定位和跟踪无线网络中的用户

    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。

    Locating and tracking a user in a wireless network through environmentally profiled data
    72.
    发明授权
    Locating and tracking a user in a wireless network through environmentally profiled data 有权
    通过环境分析数据定位和跟踪无线网络中的用户

    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。

    Method and system for determining the location of a mobile computer
    73.
    发明授权
    Method and system for determining the location of a mobile computer 有权
    用于确定移动计算机的位置的方法和系统

    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。

    Method of specifying the amount of bandwidth to reserve for use in network communications
    74.
    发明授权
    Method of specifying the amount of bandwidth to reserve for use in network communications 有权
    指定网络通信中使用的带宽量的方法

    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。

    Channel access scheme for use in network communications
    75.
    发明授权
    Channel access scheme for use in network communications 有权
    用于网络通信的信道接入方案

    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。

    Method for scheduling time slots in a communications network channel to support on-going video transmissions
    76.
    发明授权
    Method for scheduling time slots in a communications network channel to support on-going video transmissions 有权
    调度通信网络信道中的时隙以支持正在进行的视频传输的方法

    公开(公告)号：US06438136B1

    公开(公告)日：2002-08-20

    申请号：US09169121

    申请日：1998-10-09

    申请人： Paramvir Bahl

    发明人： Paramvir Bahl

    IPC分类号： H04L1243

    CPC分类号： H04N21/2385 ,  H04N21/24 ,  H04W36/16 ,  H04W74/04 ,  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，高效的通信