# Presentation: 889768

## NTIA Interim Report

- Federal Operations in the
- 1755-1850 MHz Band

**Notes:**
Government is not a telecommunications provider - not in competition with    private sector
Government will use commercial services first, and if cannot, only then will          establish own telecomm system
For example, Government uses SMR, mobile and fixed satellite systems
I am not going to review the report in detail - I hope you all have read it.
Copies available at the door
I will give an overview of our findings
The major reference we used was a DOD report - it will be briefed next
Questions for clarity only, save general questions for later sessions
Joe Camacho (report)....Gary Patrick...Bill Druhan (engineering)...
Darlene DrasoNovitch.. (international).....Joe Gatusso (outreach)

##     Functions Supported in 1710-1850 MHz

-     Functions Supported in 1710-1850 MHz

**Notes:**
Not just DOD band, it’s a Federal band - look on cover of report..see the 16 affected Federal agencies
But, DOD is by far the largest user

FUNCTIONS ARE:
satcontrol
Tactical radio relay....fixed point-to-point ....tactical weapons control
mobile digital radio.......air-to-ground video links
radar data relay (from balloons)........Shuttle comms
air combat training
robotics control (not shown)
Because of the many different functions, there is no general band plan
Going-in baseline....In any solution to 3G accommodation, Federal operations must not be degraded, not restricted from evolution and expansion if required by the missions

##   Frequency Assignments 1710-1755 MHz 

-   Frequency Assignments 1710-1755 MHz

**Notes:**
Current frequency assignments in the 1710-1755 MHz
FCC issues licenses
NTIA authorizes frequency assignments - no paper license - authorized assignments are maintained in the Government Master File - classified

each assignment may authorize multiple equipment
e.g. land mobile
aircraft
ships
many assignment are for US&P - these are not shown

##                     OBRA-93  Protected Locations

-                     OBRA-93  Protected Locations

**Notes:**
When transferred to FCC, these are the 16/17 protected areas
WSMR/Holloman AFB
There are also power distribution and public safety fixed links that will be protected

##             Protected Areas and Assignments

-             Protected Areas and Assignments

## Frequency Assignments in the 1755-1850 MHz  Band

**Notes:**
Turning to the 1755-1850 MHz band, these are the

Current assignments in 1755-1850

## 1755

- 1850

- SGLS Uplinks

- MSE Every 1 MHz

- SGLS Uplinks

- 1763.7

- 1839.8

- ACTS

- Conventional Fixed Links  Every 1 - 8 MHz

- Frequencies not to scale

**Notes:**
“layers” of interference concerns

SGLS - major problem uplink interference to Government satellites  up to 37 dB of link margin degradation from IMT-2000 base stations
Up to 20 dB of degradation from mobile (handset) units
This analysis is sensitive to the assumed 3G characteristics and buildout scenarios
SGLS interference to IMT-2000 systems up to several hundred kilometers
MSE interference both ways
ACTS interference both ways, very sensitive to IMT-2000 parameters same as satellite uplink case
Fixed systems - many links, although no sharing,  may be the easiest case to solve

## Protection Area

- Coordination  Required in Protection Area

**Notes:**
Concept of protection area
Interference to and from Federal station
To/From circles may be inverted
In this report, actual size of protection areas not too important, but rather the concept
Size of areas will depend on detailed analysis of each site, either by calculations of by measurements.
Difference between smooth earth and terrain - see DOD appendices versus table in NTIA report
SHARING in general...kids with lollipops...  time share, segment, alternate (but comparable) lollipop

##                  Satellite Control Protection Areas

-                  Satellite Control Protection Areas

**Notes:**
Satellite control protection areas for IMT-2000 mobile (small areas) and base stations (large areas)
Areas different in size due mainly to base antenna gain and interference threshold
SGLS antennas may be pointed in any direction while tracking satellites

## Schriever AFB  (AFSCN)

**Notes:**
Near Colorado Springs, CO

## Thule, Greenland   (AFSCN)

##                    Major Radio Relay Locations

-                   1755-1850 MHz

**Notes:**
Mobile subscriber equipment locations in 1755-1850 MHz band
shown with nominal 75 km protection areas

##                ACTS Potential Protection Areas

**Notes:**
ACT critical for training..don’t get much practice I shooting down other aircraft...describe ACTS concept
Not an expert...if wrong please correct me
Protection areas for Air Combat training
large areas due to airborne operations

NEW SUBJECT
Other systems are not covered in detail, but will have to be analyzed for each case e.g. weapons control, robots, airborne video, etc.

## Combined MSE and Satellite Control Areas

**Notes:**
Assuming the interference issues for the SGLS uplink, fixed, ACTS, and other systems were successfully resolved, this is remaining set of protection areas
SGLS terrestrial (mobile since in the 1755-1850 band) and MSE

## Slide 15

## Slide 16