Patent ID: 7356340

Claim:
A method for determining the spatial boundary of broadcast signal reception quality at various locations within geographical areas; said method comprising: measuring relative quality of certain of said broadcast signal reception quality at a defined region within said geographical area, said measuring occurring within a mobile device and resulting in measured data; said defined region being defined by the movement of said mobile device; and maintaining within said device said measured data so as to define poor quality areas within at least a portion of said defined region, wherein said maintaining comprises storing within data cells instances of poor quality locations within said defined region and from time to time reassessing said data cells, wherein said reassessing comprises reprocessing to collapse measured data stored within said device so that certain of said data cells form a single data cell, wherein said measured data is a count of poor signal quality maintained individually for a plurality of location cells within said geographical area, and wherein said device increments said bad signal count with respect to the cell location of said experienced poor quality whenever said device experiences an instance of poor quality.