第一工作组最后报告1695 1710mhz气象卫星

1.Executive Summary The Commerce Spectrum Management Advisory Committee (“CSMAC”)Working Group 1 (“WG-1”) was tasked with developing recommendations for use of the1695-1710 MHz band for commercial services while protecting Federal meteorologicalearth stations from harmful interference. General instructions to the Working Groupswere to “explore ways to lower the repurposing costs and/or improve or facilitateindustry access while protecting federal operations from adverse impact” withinstructions specific to WG-1 to improve modeling of commercial wireless network andpossible reduction of exclusion zones using the Fast Track report as a baseline for federalprotection requirements. Based on this guidance, WG-1 met extensively beginning inJuly 2012 to: (1) provide refined Long-Term Evolution (LTE) system parameters thatmore accurately reflect real world deployment scenarios; (2) review operating parametersof Federal systems affected by commercial operations in the 1695-1710 MHz band; (3)modify the existing simulation model used by NTIA to reach the conclusions aboutuse/sharing of the 1695-1710 MHz band; and (4) Identify areas for further considerationof possible alternatives that may maximize availability of the spectrum in major marketareas. Significant progress was made to refine interference analysis and develop adeeper understanding of the issues and options available for maximizing access to thespectrum for commercial services while protecting incumbent federal operations in the1695-1710 MHz and the adjacent 1675-1695 MHz bands. A technical WorkingCommittee with both Government and industry technical experts from all of the CSMACWorking Groups was created to facilitate detailed discussions of LTE operations andparameters. The work of this committee resulted in agreed LTE technical parameters foranalysis that more accurately depicts real world operation of LTE networks and how toapply the parameters to interference analysis.1The output of the technical working groupincludes refined UE operating parameters that more closely represent real operationsincluding power distribution curves, base station parameters, and out-of-band emissions.NTIA updated its analyses based on the updated LTE technical parameters as well asinput from WG-1 on the propagation model and analysis approach, which resulted in asignificant reduction in the anticipated separation distance at which an LTE system wouldpotentially cause harmful interference to a Meteorological Satellite receiver as comparedto the exclusion zone separation distances presented in NTIA’s Fast Track report. Theimpact on separation distances varies from site to site based on the assumptions andconditions used in the analysis, and ranges from 21-89%. The final results of NTIA’s analysis are depicted in Appendix 7 of this report. These results may be further refinedon a case by case basis as transition discussions begin. The Working Group was also successful in developing a framework for sharingthe band that protects incumbent federal operations while maximizing the opportunity forcommercial use. The framework recognizes the need to protect the operations of both theco-channel polar orbiting satellites as well as geostationary operations in the adjacent1675-1695 MHz band. The framework is conditioned on Protection Zones that will bebased on the NTIA interference analysis and protection criteria, including aggregateInterference Power Spectral Density (IPSD) limits, to be determined for each receiverlocation.2The framework provides for deployment of commercial operations outside ofthe Protection Zones without any coordination. It also permits commercial operationswithin the Protection zone following a successful coordination process concluding thatsuch commercial operations can meet specified conditions and will not cause harmfulinterference to ensure no loss of federal capability within the protection zones. Ifcoordination is unsuccessful, commercial operations will not be permitted within theProtection Zone. To facilitate coordination, the framework recognizes the need for a clear andconsistent coordination process. Details of the coordination framework are outline inAppendix 1. To create this coordination process, NTIA and FCC, in conjunction with theaffected federal agencies, need to establish: 1) a nationally-approved interferenceprediction model, associated input parameters, and distribution of aggregate IPSD limitamong commercial licensees; 2) coordination procedures, including an automatedprocess, to the extent possible, to assess if the proposed commercial network will meetthe IPSD limits, to facilitate coordination allowing commercial licensee operations withinthe Protection Areas; and 3) procedures for implementing on-going real-time monitoringto ensure IPSD limits are not being exceeded and that commercial operations can beadjusted immediately if they are. The framework stipulates that the criteria andprocedures for coordination and operation within the