tion (NTIA) have interest in CR. a function of a spatially variant regulatory policy. The FCC has solicited various comments on rule changes A sequence of position estimates may be used to es- and an SPTF report. NTIA has been involved in the timate velocity. Take a scenario in which teenagers' cell discussions as they relate to government use of spectrum. phones would tattle to their parents when their speed exceeds a certain speed. For example, suppose tattle mode is set. The radio is moving at 45 mph at 7:30 a.m. 2.4b.6.1 Cognitive geolocation The radio calls the parent and asks a couple of questions applications such as: "Is 45 mph okay at this time? Is time relevant?" The questions will be in the same order each time and the If a CR knows where it is in the world, myriad applica- parent won't have to wait for the whole question, just the tions become possible. The following is a short set of velocity being reported. Then the parent keys in a re- examples. Figure 2.4b-6 shows a use case level context sponse. After a few reports, the radio will develop diagram for a CR with geolocation knowledge. a threshold as a function of time. For example, during the Establishing the location of a CR enables many new time the radio is heading for school, 45 mph is okay. functions. A cognitive engine for learning and adapting During the lunch break (assuming a closed campus), can utilize some of the new functions. There are multiple 15 mph might be the threshold. An initial profile may be methods for determining location. For example, GPS programmed, or the profile may be learned through tat- receiver technology is small and inexpensive. Given an tling and feedback to the reports. Vehicle position and appropriate API, numerous applications including net- velocity might also be useful after curfew. work localization (discussed next) and boundary aware- The CR application uses special hardware or cus- ness are available to the cognitive engine in the CR. tomized waveforms that return geolocation information. Network localizat