公开(公告)号：US06914557B2

公开(公告)日：2005-07-05

申请号：US09947422

申请日：2001-09-05

申请人： Donald C. D. Chang ,  Ying Feria ,  Weizheng Wang ,  Alan G. Cha ,  Ming U. Chang ,  Frank A. Hagen ,  Kar W. Yung

发明人： Donald C. D. Chang ,  Ying Feria ,  Weizheng Wang ,  Alan G. Cha ,  Ming U. Chang ,  Frank A. Hagen ,  Kar W. Yung

IPC分类号： H04B7/06 ,  H04B7/08 ,  H04B7/185

CPC分类号： H04B7/18504 ,  H04B7/0617 ,  H04B7/086

摘要： A system and method for tracking a user. The system is adapted for use in a wireless communication system and creates a plurality of beams within a coverage area. A first beam is directed at a user in a first microcell and a number of additional beams illuminate microcells immediately adjacent the first microcell. The system is equipped with a mechanism for detecting movement of the user from the first microcell to one of the immediately adjacent microcells. On the detection of movement of the user, the system redirects the first beam from the first microcell to a second microcell, the second microcell being one of the adjacent microcells. In the illustrative embodiment, the system is implemented in a stratospheric platform based communication system including a hub adapted to communicate with a stratospheric platform. A transceiver and a phased array antenna are disposed on the platform to communicate with the hub and with the user. A second antenna is provided on the platform to communicate with the hub. Beamforming and direction are implemented on the hub and communicated to the platform. The user's position is detected with a global positioning system receiver, by measuring the strength of a signal received from the user, or by other suitable means. On detection of user movement from the first microcell, the beamforming system redirects the beam to follow the user into a second microcell. Additional beams around the user's microcell are illuminated to facilitate detection of the users movement.

摘要翻译： 用于跟踪用户的系统和方法。 该系统适用于无线通信系统，并在覆盖区域内创建多个波束。 第一光束被引导到第一微小区中的用户，并且多个附加光束照亮紧邻第一微小区的微小区。 该系统配备有用于检测用户从第一微小区到紧邻的微小区之一的移动的机制。 在检测用户的移动时，系统将第一光束从第一微小区重定向到第二微小区，第二微小区是相邻微小区之一。 在说明性实施例中，该系统在基于平流层平台的通信系统中实现，其包括适于与平流层平台通信的集线器。 收发器和相控阵天线设置在平台上以与集线器和用户通信。 在平台上提供第二天线以与集线器通信。 波束形成和方向在集线器上实现并传达到平台。 通过测量从用户接收的信号的强度，或通过其他合适的方式，用全球定位系统接收机检测用户的位置。 在检测到来自第一微小区的用户移动时，波束成形系统重定向波束以跟随用户进入第二微小区。 用户微单元周围的附加光束被照亮以便于检测用户的移动。