利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

52 条记录 (耗时 0.039 秒)

    Mobile location estimation in a wireless communication system
    51.
    发明授权
    Mobile location estimation in a wireless communication system 失效
    无线通信系统中的移动位置估计

    公开(公告)号：US6163696A

    公开(公告)日：2000-12-19

    申请号：US775329

    申请日：1996-12-31

    申请人： Qi Bi ,  Wen-Yi Kuo

    发明人： Qi Bi ,  Wen-Yi Kuo

    IPC分类号： H04W64/00 ,  H04Q7/20

    CPC分类号： H04W64/00

    摘要： Methods and apparatus for estimating mobile station location in a wireless communication system. At initiation of a call or a page response, a mobile station of the system sends an access request signal to a primary base station. The primary base station responds with an access acknowledgment which may be intentionally delayed such that the mobile station increases its transmit power level. The primary base station then transmits a channel assignment message to the mobile station. The mobile station responds by transmitting a location signal in the form of a known user-specific traffic preamble at the higher transmit power level. The primary base station intentionally delays sending an acknowledgment of the preamble, such that the mobile station transmits the preamble for a longer period of time than it would otherwise. This additional transmission time allows the preamble to be detected accurately in the primary base station as well as in a number of other surrounding base stations in a manner suitable for generating path delay measurements. A primary location processor associated with the primary base station uses the path delay measurements from the primary and surrounding base stations to generate an estimate of mobile location. The mobile location estimation may be provided during an on-going call by the primary base station sending a fake handoff message to the mobile station directing it to handoff to the same base station and traffic channel but with a different power level and preamble length, or by the primary base station sending a predetermined location probe message directing the mobile station to transmit the traffic preamble with a desired power level and preamble length.

    摘要翻译： 用于估计无线通信系统中的移动台位置的方法和装置。 在开始呼叫或寻呼响应时，系统的移动台向主基站发送接入请求信号。 主基站用可能有意延迟的接入确认进行响应，使得移动台增加其发射功率电平。 然后，主基站向移动台发送信道分配消息。 移动台通过以较高发射功率电平以已知的用户特定业务前导码的形式发送位置信号进行响应。 主基站有意地延迟发送对前同步码的确认，使得移动站发送比其它方式更长的时间段。 该附加传输时间允许在适合于生成路径延迟测量的方式中，在主基站以及多个其它周围基站中准确地检测前导码。 与主基站相关联的主位置处理器使用来自主基站和周围基站的路径延迟测量来生成移动位置的估计。 移动位置估计可以在主基站正在进行的呼叫期间提供，该主基站向移动台发送假切换消息，指示它切换到相同的基站和业务信道，但具有不同的功率电平和前导码长度，或者 由主基站发送指示移动台以期望功率电平和前导码长度发送业务前同步码的预定位置探测消息。