Broadcast Use of 6 GHz January 23, 2020 1 U-NII II-6 (6425 6525 - PowerPoint PPT Presentation

Broadcast Use of 6 GHz January 23, 2020 1

U-NII II-6 (6425 – 6525 525 MHz) z) U-NII NII-8 (6875 – 7125 25 MHz) z) • Fixed Links – Studio-to-Transmitter and Intercity Relay (STL/ICR) • Most in 6875 – 7125 MHz • Engineered for high reliability • Standard frequency coordination practices generally apply (TIA TSB-10) • Mobile ENG – Portable Cameras and News Trucks • Most 6425-6525 MHz – Nationwide • 6875-7125 MHz – Used in many large urban markets • See WT Docket 10-153 Order, August 9, 2011, para 20 and 23 • Typical Power levels: 0.01 to 0.5 watts • Portable camera uses can be indoors or outdoors • No database of ENG operations • Operation is generally based on “home channel” plans • On-site, near real-time coordination used at large events 2

Visli link k Camera mera Back 6 G GHz Hz Transm nsmit itter er 3

Temporar porary y Fixed ed Link (74.2 .24) 4) 4

Broadcast Sites Have High RF “Visibility” Empire State Building South Mountain (Phoenix) 5

Alion on Repor ort • Three mobile use cases: • Indoor portable camera • Outdoor portable camera • ENG truck to central receive site • RLANs checked for LOS • Only LOS IX cases considered • Indoor RLANs (95%), incl. bldg. loss • Mix of plain glass and Low-e, 70/30 • 1 RLAN/person assumed • 50% have 6 GHz capability • 10% and 0.44% TX activity factors • 20/40/80/160 MHz BWs EIRP  0.2 W indoor;  4 W outdoor • 6

Assumed umed RLAN N Chara ract cteristics eristics • 6 GHz characteristics generally based on observed 5 GHz RLAN characteristics EIRP distributions emphasize low power levels per ITU-R 5A/1065 • • Antenna elevation pattern suppresses energy at steep elevation angles per ITU-R M.1652-1, 2019 • Bandwidths distributed per 5A/1065, result in low probabilities of overlap with 20 MHz ENG channel 7

Building lding Entr try y Loss • 70% of indoor RLANs assumed in “traditional” buildings; 30% in thermally - efficient buildings. Loss distributions per ITU-R P.2109-1 and P.2346. 8

Key Result ults s – Indoor oor Camer era • Example case: • ~2/3 of snapshots exceed IX threshold of -10 dB I/N • ~1/2 exceed -6 dB • ~10% exceed +20 dB (RLAN equal to ENG signal • IX due to OOBE was a significant contributor in indoor cases 9

Some me Result ults s – Outdoor door Camera mera % Indoor RLAN % Outdoor RLAN % Indoor RLAN % Outdoor RLAN % All RLANs • IX is a strong function of ENG truck max. single-entry max. single-entry ENG receiver location Rx antenna Activity (%) aggregate above aggregate above aggregate above above I/N above I/N I/N threshold I/N threshold I/N threshold threshold threshold antenna height; 15m is typical DC ENG Truck Omni 1.5 m 10 15.6 4.2 15.7 4.2 19.2 • Most IX due to indoor RLANs DC ENG Truck Omni 15 m 10 38 11.9 39.2 11.9 46.6 DC ENG Truck Omni 1.5 m 0.44 0 0 0 0 0 • In example case, ~1/2 of indoor DC ENG Truck Omni 15 m 0.44 2.2 0.5 2.2 0.5 2.7 PG ENG Truck Omni 1.5 m 10 0.2 0.2 0.2 0.2 0.4 PG ENG Truck Omni 15 m 10 22.5 29.1 25.6 29.4 48.7 RLANs were above IX threshold PG ENG Truck Omni 1.5 m 0.44 0 0 0 0 0 PG ENG Truck Omni 15 m 0.44 1 1.4 1 1.4 2.5 • ~1/3 above at I/N = -6 dB DC ENG Truck Sector 1.5 m 10 16.8 4.4 16.9 4.4 20.5 DC ENG Truck Sector 15 m 10 41.5 12.3 42.5 12.3 49.6 DC ENG Truck Sector 1.5 m 0.44 0.9 0.2 0.9 0.2 1.1 DC ENG Truck Sector 15 m 0.44 2.2 0.5 2.2 0.5 2.7 DC ENG Truck Sector 1.5 m 10 14.3 4.3 14.5 4.3 18.2 DC ENG Truck Sector 15 m 10 34.7 11.5 35.9 11.5 43.4 DC ENG Truck Sector 1.5 m 0.44 0.7 0.2 0.7 0.2 0.9 DC ENG Truck Sector 15 m 0.44 1.9 0.5 1.9 0.5 2.5 PG ENG Truck Sector 1.5 m 10 0.2 0.2 0.2 0.2 0.4 PG ENG Truck Sector 15 m 10 46.5 33.4 49.8 33.6 66.9 PG ENG Truck Sector 1.5 m 0.44 0 0 0 0 0 PG ENG Truck Sector 15 m 0.44 2.8 1.9 2.8 1.9 4.6 PG ENG Truck Sector 1.5 m 10 0.4 0.3 0.4 0.3 0.6 PG ENG Truck Sector 15 m 10 21.6 26.2 24.3 26.5 45.2 PG ENG Truck Sector 1.5 m 0.44 0 0 0 0 0 PG ENG Truck Sector 15 m 0.44 0.9 1.4 0.9 1.4 2.3 10

Some me Result ults s – ENG Truck uck to Central tral Sit ite • Prominence of ENG Central 28 km Receive sites means LOS at (16 mi) large distances • IX nearly certain and continuous • Even without outdoor RLANs % % Indoor % % of Outdoor % Indoor % All % of % of Antenna RLAN max. Outdoor snapshots RLAN max. RLAN RLANs snapshots snapshots ENG receiver Rx Activity azimuth single- RLAN with no single- aggregate aggregate with no with no location antenna (%) angle entry aggregate outdoor entry above I/N above I/N indoor RLAN RLAN (deg) above I/N above I/N RLAN above I/N threshold threshold contributor contributor threshold threshold contributor threshold Cowles Mtn. ProScan 10 227 100 100 100 100 100 0 0 0 Cowles Mtn. ProScan 0.44 227 83.1 51.6 91.9 54.5 97.4 0 0 0 Cowles Mtn. ProScan 10 194 100 100 100 100 100 0 0 0 Cowles Mtn. ProScan 0.44 194 86.5 61.2 95.8 65.5 99.2 0 0.1 0 Cowles Mtn. ProScan 10 108 100 99.3 100 100 100 0 0 0 11 Cowles Mtn. ProScan 0.44 108 46 20.5 50.7 22.5 65 0 0.1 0

Some me Result ults s (2) ) – ENG Truck uck to Central ntral Sit ite • 100% of snapshots had indoor RLAN IX above threshold • ~10% had indoor RLAN IX exceeding +20 dB I/N (stronger than typical ENG signal) 12