公开(公告)号：US06246874B1

公开(公告)日：2001-06-12

申请号：US09213027

申请日：1998-12-16

申请人： Daniel A. Voce

发明人： Daniel A. Voce

IPC分类号： H04Q720

CPC分类号： H04B7/18571 ,  H04B7/18541 ,  H04B7/1855 ,  H04W36/00 ,  H04W64/006 ,  H04W84/06

摘要： A method and apparatus for predicting when to perform spot beam and satellite handover in a mobile satellite communication network that uses the position of the mobile subscriber. The method and apparatus perform all calculations with respect to a satellite-based coordinate system, thereby eliminating the need to model the shape of the geometrically complex spot beams on the surface of the earth. The position of a mobile subscriber unit that initiates a call is tracked relative to a set of spot beam boundaries that are located equidistant between a first spot beam within which the subscriber unit is located at the time of call initiation and a set of adjacent spot beams. An interval during which the subscriber unit will cross over one of the boundaries is estimated. The spot beam into which the subscriber is traveling is identified, and the interval is adjusted until a desired level of accuracy has been achieved at which time the call is transferred from the first spot beam to the adjacent spot beam at the estimated time. For satellite handover, an angle of elevation between the subscriber unit and the satellite is calculated and compared to a threshold angle. When the angle of elevation drops below the threshold angle due to the movement of the satellite, the call is transferred from a first satellite to a neighboring second satellite.

摘要翻译： 一种用于在使用移动用户的位置的移动卫星通信网络中预测何时执行点波束和卫星切换的方法和装置。 该方法和装置对于基于卫星的坐标系进行所有计算，从而消除了对地球表面上的几何复杂点波束的形状进行建模的需要。 发起呼叫的移动用户单元的位置相对于在呼叫发起时用户单元所在的第一个点波束与一组相邻的点波束之间的等距离定位的一组点波束边界被跟踪 。 估计用户单元跨过其中一个边界的间隔。 识别用户正在行进的点波束，并且调整间隔直到达到期望的准确度水平，在该时间内，在所估计的时间将呼叫从第一点波束传送到相邻的点波束。 对于卫星切换，计算用户单元和卫星之间的高度角，并将其与阈值角度进行比较。 当由于卫星的移动而导致角度降低到阈值角以下时，呼叫从第一卫星传送到相邻的第二卫星。

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。