公开(公告)号：US06389289B1

公开(公告)日：2002-05-14

申请号：US09290487

申请日：1999-04-12

申请人： Daniel A. Voce ,  Matthew Mohebbi ,  Asha Mehrotra ,  John Fry

发明人： Daniel A. Voce ,  Matthew Mohebbi ,  Asha Mehrotra ,  John Fry

IPC分类号： H04Q738

CPC分类号： H04B7/18547

摘要： A method and apparatus for determining the proper satellite communications service to be provided to a subscriber unit that may be integrated with the geographically defined service areas used in terrestrial cellular communications systems. The pre-existing geographically defined service areas are subdivided into quadrilateral tiles wherein each tile corresponds to a single service area. In addition, the tiles are mapped to a grid having a plurality of regularly spaced grid locations. A lookup table is created that references each grid location to the tiles that overlap the grid locations. The position of the subscriber unit and an approximated region of error within which the subscriber unit is likely to be located are used as input. The approximated region of error is mapped to the grid to identify the grid locations that align with the approximated region of error. Thereafter, the lookup table is accessed to identify the tiles associated with the aligning grid locations and the identified tiles are then used to identify the service area in which the subscriber unit is located so that the proper communications service may be provided. If necessary, geometrical point in polygon inclusion methods and ellipse and polygon intersection methods are used to more accurately identify the tiles of interest.

摘要翻译： 一种用于确定要提供给用户单元的适当的卫星通信业务的方法和装置，其可以与地面上定义的在地面蜂窝通信系统中使用的服务区域集成。 预先存在的地理上定义的服务区域被细分为四边形瓦片，其中每个瓦片对应于单个服务区域。 此外，瓦片被映射到具有多个规则间隔格格位置的网格。 创建一个查找表，它将每个网格位置引用到与网格位置重叠的图块。 用户单元的位置和用户单元可能位于其中的近似误差区域被用作输入。 将近似误差区域映射到网格以识别与近似误差区域对齐的网格位置。 此后，访问查找表以识别与对准网格位置相关联的瓦片，然后使用所识别的瓦片来识别订户单元所在的服务区域，以便可以提供适当的通信服务。 如果需要，使用多边形包含方法中的几何点和椭圆和多边形交点方法更准确地识别感兴趣的图块。