MSS Interference Analysis for AeroMACS October 12, 2012

Introduction Working group was established by RTCA SC-223 Charter: Define a working method of specifying emissions from all expected AeroMACS future deployments that are compliant with ITU co-interference requirements, to establish 2- way link levels with the aircraft to ensure closure of the RF-link without adversely affecting the Global Star Satellite feeder links. The deliverable would be in the form of MOPS or SARPS requirements and a technical report delivered to an ICAO technical group via a working paper. 2

MSS Interference Analysis WG Participants FAA - Brent Phillips FAA - Mike Biggs DFS - Armin Schlereth ECTL - Nikos Fistas INDRA – Antonio Correas Uson SINTE - Jan Eric Hakegard NASA - Jeff Wilson NASA - Rafael Apaza Harris - Art Ahrens ITT Exelis - Bruce Eckstein ITT Exelis - Natalie Zelkin ITT Exelis – Ward Hall 3

Analysis Method Very large and Large size airports > US categories: XL/Large/OEP (Qty 35) > Europe categories: Very Large/Large (Qty 50) > Model parameters > Horizon-omni base station pattern > 2x transmitter PA power > All AeroMACS channels* are used Medium size airports US category: Class C (Qty 123) > Europe category: Medium (Qty 50) > Model parameters > Horizon-omni base station pattern > 1x transmitter PA power > AeroMACS channel use factor Small size airports > All other airports in Openflights database. > Model parameters > Base station sector directional antennas > Sectors pointed in random directions > 1x transmitter PA power > AeroMACS channel use factor All airports world-wide are included in the analysis > Non-US and Europe airports found to not to contribute significantly to N. Atlantic interference hotspot 4 The analysis method was driven by the European study [1] of number of sectors required at an airport (e.g., if the number of sectors was greater than 11 (number of channels in ) then a pseudo-omni was assumed as a given channel would be used in more than one direction) [1] WA4 Airport Capacity & Coverage An AeroMACS channel is the 5 MHz-wide bandwidth transmitted by a base station sector that consists of 512 sub-carriers

Analysis Conditions and Assumptions Effective isotropic Radiated Power (EiRP) is the sector transmit power at the antenna input plus antenna gain Maximum allowable EiRP in a base station sector shall be the sum of both transmit power amplifiers (PAs) in a 2-channel MIMO system Base Station Sector patterns are defined to be ITU-R F reference patterns with 120˚ 3dB beamwidth toward the Horizon Zero base station pattern down-tilt Scaling assumptions: > A factor for occupied number of channels per airport category > 22 channels used for large airports > 6 of 11 channels for medium airports > 1 of 11 channels for small airports > Apply a 50% power reduction to small airports MSS interference analysis completed by NASA using Visualyze software 5

6 Recommended gain mask

7

Draft Limits Table Airport Category Definitions – Based on ICAO airspace definitions 8 Airport category Maximum number of channels at an airport Maximum total radiated power at an airport channel, mW Maximum Allowable EiRP per Base Station Sector, dBm +22 dBm (300 mw) maximum sector PA power +15 dBi peak sector antenna gain 0˚ (Horizon) to +1.5˚ Elev. +1.5˚ to 7.5˚ (linear decrease) +7.5˚ to 27.5˚ (linear decrease) +27.5˚ to Zenith (linear decrease) Large to 3434 to 2222 to -1 Medium to 3434 to 2222 to -1 Small to 3131 to 1919 to -4

Recommendations 9 The ACP WG is invited to consider using the provided information as the basis of ICAO SARPs spectrum requirements for AeroMACS.