Altitude determination and distribution in cellular communication systems

摘要

In the present invention, data of a digital altitude map (42) of a cell in a cellular communication system is compressed in a first node by defining a polygon (41) essentially representing the boundary of the cell. Each polygon corner (40) is defined by a point having two lateral coordinates and an associated altitude parameter. In this manner a set of at least three points is defined. This set of points constitutes a relatively limited amount of data, which easily can be transferred over an interface (38) to a second node. In the second node, the set of points is used as parameters for creating an altitude model (43). By using a pair of lateral coordinates (44) as input arguments of the model (43), an estimation of an associated altitude (45) can be derived.