量化小组委员会潜在问题

Quantification of Federal Spectrum Use Potential New Questions February 18, 2015 Objective •What additional spectrum occupancy measurementrelated questions should the CSMAC address? Question 1 – Dynamic Sharing Spectrum occupancy measurements could be used to facilitatedynamic (minutes/hours) spectrum sharing in conjunction with adatabase. There are different architectures (sensing in the devices,sensing along the entrant boundaries, sensing along the incumbentboundaries, etc) that potentially band and location specific. Forexample, DFS is a sensing on the device approach that is deployedworldwide. What are the technical and policy issues that proponentsof these systems should address to enable rapid adoption? What arethe strengths and weakness of measurement-based spectrum sharingapproaches? Question 2 – Operational Measurements How should propagation measurements be used operationally infuture spectrum sharing approaches? For example, measurements ofoff-the-air signals can be used to estimate dynamic atmosphericducting phenomena. Foliage changes or estimate number of userscould also be continually estimated and fed into databases. Thisinformation could avoid the use of worse case propagation loss andentrant usage assumptions in database spectrum sharing approaches. Question 3 – Propagation Measurements What propagation measurements should be made to enhancespectrum sharing? Propagation models have a huge impact onspectrum sharing efficiency. While there has been extensivepropagation measurements made over the years, there was largedisagreement during the previous CSMAC WGs on what propagationmodels to use. Should there be improved general models, or sitespecific measurements? Does work need to be done on air-ground orground to ground models? Question 4 – Enforcement Level of Effort What level of effort is needed to support enforcement usingmeasurements in future spectrum sharing approaches? Would a few‘go-to measurement teams’ be enough (present approach), or is adedicated (expensive) fixed, distributed spectrum measurementsystem needed/useful?