wg-5空战训练系统子工作组最终报告草案

Air Combat Training SystemSub-Working Group Report 1.Introduction: The Commerce Spectrum Management Advisory Committee (CSMAC) Working Groupstructure was created to explore ways to lower the repurposing costs and/or improve or facilitatecommercial wireless industry access while protecting federal operations from adverse impact.Working Group 5 (WG-5) was specifically tasked with studying issues related to airborneoperations in the 1755-1850 MHz band. Within WG-5, Sub-Working Group Air CombatTraining System (SWG P5 ACTS) was created to focus on issues related to ACTS operating inthe band. Pursuant to the working group structure provided by National Telecommunicationsand Information Administration (NTIA), the expected focus of work for WG-5 would be the 1)determination of protection requirements for federal operations, and 2) understanding of natureand the impact to commercial wireless of government airborne operations. Based on this guidance, the SWG P5 ACTS met on a biweekly basis, or as required, to developa common understanding between government and industry regarding the operations andprotection requirements for ACTS and to agree on and execute an approach for analyzing thepotential for interference both to and from ACTS and commercial 4G Long Term Evolution(LTE) operations. This analysis is intended to form a basis for a recommendation on thefeasibility of spectrum sharing and on steps that should be taken, or areas for further analysis, tofacilitate sharing if it is determined that sharing appears feasible. Work was initiated based on information in the NTIA Fast Track report However, significantadditional work was accomplished by Government representatives to review the applicablegovernment operations and ensure that the areas of operation and channel assignments wereaccurate, although none of this information was released to the SWG so it could not be used toinform the discussions within the SWG. The SWG also used information developed in aTechnical Committee created as part of WG-1 to provide accurate information on LTEparameters. Finally, the SWG P5 ACTS was also informed by the WG-5 Technical Committee,created as part of WG-5 to consider technical issues related to interference analysis. The SWGACTS enjoyed broad participation from a range of government and industry representatives.Work was limited to completion of worst case interference analysis for three sample locations; UNCLASSIFIED however, there are a significant number of P5 ACTS locations throughout the US, ReferenceAppendix 3.As described in this report, a number of proposals have been made and are underconsideration to revise and refine the analysis to better understand when harmful interferencewould occur. Such refinement would allow for a more accurate assessment of sharingopportunities. In addition, because information on channel assignments or more detailed use ofACTS was not provided to the SWG, no consideration of or discussion of methods tocooperatively facilitate sharing have occurred – either on a time basis, arrangement of channeluse to meet the needs of both industry and government or other dynamic methods to facilitatesharing. Consideration of assignment information and related discussions would be highlyrelevant to meeting the goal of CSMAC to “explore ways to lower the repurposing costs and/orimprove or facilitate commercial wireless industry access while protecting federal operationsfrom adverse impact.” Such information and analysis could have informed consideration of aprocess to prioritize access to the 1755-1780 MHz portion of the band while ensuring that federalagencies are not adversely impacted. The worst case analysis completed by the group providesonly minimal information towards sharing arrangements and is insufficient to fully assessopportunities without additional work. 1.1Executive Summary of Findings: The SWG P5 ACTS initiated analysis on two specific work plans to identify theprotection distances for: (1) user equipment (UE) to ACTS and (2) ACTS to LTE base stations.Using the randomized real aggregation approach, the overall protection distances observedextend beyond 325 km for the UE to ACTS environment. However, LTE base stations, theprotection distances were slightly less but extended to 285 km and beyond depending on theorientation of the base station antenna. It should be noted that variations in base station antennaheights above ground level had small effects on the predicted required separation distances. 1.2Summary of Observations/Recommendations for Presentation to CSMAC: The SWG P5 ACTS has performed an analysis of two work plans to determine protectiondistances for both the UEs to ACTS and ACTS to the LTE base stations based on worst caseanalysis. To not interfere with P5 ACTS while sharing spectrum, the UEs must restrict itscoverage area over which the LTE services are provided. The resulting studies described hereinare based on the data noted in Table 1.2, and it appears that sharing