<title>Service overlays on North American standard cellular</title>

Abstract

Within the context of a layered view of cellular systems, how new services can be offered over existing cellular communications infrastructure is described. Within a layered system, it is possible to add new layers to offer additional services without requiring modification to existing layers. Examples of how cellular service enhancements have been provided in the past are illustrated in this layered view, as well as pointing directions for possible future improvements. Within the context of this viewpoint, it is argued that AMPS may continue to provide a basis for enhanced cellular services.