A radio apparatus forming a radio network system calculates a calculated distance, based on a tentative self-position and tentative positions of a plurality of radio apparatuses existing in the vicinity. The tire may have one or more air chambers. The method also includes determining a structure of the material based on the measurements. Further, any message information corresponding to the selected information elements may be removed to protect sensitive data. Each antenna in the array is configured to provide the subscriber service to a particular service segment.