wg5小型无人驾驶飞机系统工作小组最终报告草案

Commerce Spectrum Management Advisory Committee (CSMAC)Working Group 5 (WG 5) 1755-1850 MHz Airborne Operations Sub-Working Group Report (Small Unmanned Aircraft Systems) 1.Introduction The Commerce Spectrum Management Advisory Committee (CSMAC) Working Groupstructure was created to “explore ways to lower the repurposing1costs and/or improve orfacilitate industry access while protecting federal operations from adverse impact.” WorkingGroup 5 (WG-5) was specifically tasked with studying issues related to airborne operations inthe 1755-1850 MHz band. Within WG-5, Sub-Working Group Small Unmanned AircraftSystems (SWG-5 SUAS) was created to focus on issues related to Small Unmanned AircraftSystems operating in the band. Pursuant to the working group structure provided by NTIA theexpected focus of work for WG-5 would be the (1) determination of protection requirements forfederal operations, and (2) understanding of the periodic nature and the potential impact (e.g.,interference) to commercial wireless of government airborne operations. Based on this guidance, SWG SUAS met on a biweekly basis, or as necessary, to develop acommon understanding between government and industry regarding the operations andprotection requirements for SUAS and to agree and execute on an approach for analyzing thepotential for interference both to and from SUAS and commercial Long Term Evolution (LTE)operations. It was expected that the results of this analysis will form the basis for arecommendation on the feasibility of sharing the use of this band (i.e., spectrum sharing) and onadditional steps that should be taken, or areas for further analysis, to facilitate or enhance sharingif it is determined that sharing appears feasible. Work was initiated based on information in the NTIA’s “Assessment of the Viability ofAccommodating Wireless Broadband in the 1755-1850 MHz Band” (March 2012) report.Significant additional work was accomplished by Government representatives to review thegovernment operations and ensure that the areas of operation and channel assignments areaccurate. The SUAS SWG also used information developed in a Technical Working Group(TWG) created as part of WG-1 to provide accurate information on LTE parameters. Finally,SWG SUAS was also assisted by WG-5 TWG to consider technical issues related tointerference analysis. SWG SUAS enjoyed broad participation from a range of government andindustry representatives and the work provides a foundation to evaluate the potential for bandsharing between SUAS and LTE Systems. 1.1Executive Summary of Findings UNCLASSIFIED DRAFT as of 20 June 2013 During the initial meetings between industry and the Department of Defense (DoD), industryrepresentatives requested the following information about each SUAS system: (1) the frequencyassignment; and (2) the location of the assignment.Because of security regulations, DoD couldnot publicly release this information and make it available to industry members (Paragraph 2.3infra). As a result,SWG SUAS cannot make any finding on the feasibility of spectrumsharing between Federal and commercial wireless systems. Because DoD could not publicly release information to industry members, SWG SUASconducted an analysis of co-channel operations to explore separation distances between SUASand commercial wireless operations. SWG SUAS initiated analysis on two specific work plans.These focused on identifying the required protection distances for: (1) LTE user equipment2(UEs) to SUAS and (2) SUAS to LTE Base Stations. The analysis modeled the LTE networkinfrastructure using a randomized real aggregation network provided by commercial wirelessindustry. This approach enabled the aggregation of UE impacts to SUAS and the overallprotection distances were determined to extend beyond 300 km for the UE to SUAS case.Forthe protection distances from the SUAS to LTE Base Stations, those distances were slightly lessbut extended from at least 285 km depending on the orientation of the base station antenna. Itshould be noted that variations in base station antenna heights above ground level had smalleffects on the predicted required separation distances. 1.2Summary of Observations/Recommendations for Presentation to CSMAC UNCLASSIFIED 1.3Next Steps/Path Forward Additional study efforts may be required to address the outstanding issues that are noted inparagraph 1.4 below. However, at this time, the conduct of further studies would be dependenton associated funding being provided as well as a final decision by the commercial wirelessindustry, NTIA and DOD. 1.4Outstanding Issues The SWG SUAS determined there are other possible areas of consideration that could be studiedfor additional “Observations” related to the SUAS analysis. Those possible areas that maywarrant additional study include: a.Effects of off-tuning of the LTE base station from the SUAS Frequency of Operations(FO);b.Implementation of notching specific LTE channels within a wireless licensee’s f