Margaret Daly and Sean OHara

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RPC 700 MHz Interference Protection Analysis
SoftwareAlgorithm and Use
The Schliemanator

• Margaret Daly and Sean OHara
• Syracuse Research Corporation
• New York Statewide Wireless Network Program

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Use of the NYS Software

• The software is for evaluation of RPC
  applications, specifically for evaluation under
  the TSB-88-based rules defined in the Region 8,
  30, and 55 700 MHz plans
• The software will be distributed free of charge
  for use by any of the RPCs
• The software was developed under Matlab, and will
  be compiled into a Windows application
• Versions have already been compiled, however the
  final revision and its distribution will wait
  until it can incorporate the final CAPRAD
  assignments
• Still developing the final design of the user
  interface and user options that will be available

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Use of the NYS Software (cont)
Output reports include fully formatted text,
tables, and graphics (propagation maps,
interference areas, etc)
User only has to select the application file(s)
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Analysis Overview

• The Longley Rice Propagation model is used to
  predict interference from the applicant to the
  service areas of the deployed and planned sites
• Analysis is performed based on each application
  site, for each of the frequencies within the
  application
• Deployed sites and pool boundaries are identified
  with respect to the application site based on
  distance, co/adj channels, etc.

Basic geometry for application, deployed, and
pool boundaries
D1
D2
A
P1
D Deployed sites P Pool boundaries
P2
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Identification of Study Parameters

• Identify Deployed Sites/Licenses
• Find all sites within 100 km of applicant site
  (based on the coordinates of the of the
  application site and the deployed sites) that are
  co-channel to applicant (within 1kHz)
• Find all sites within 20 km of applicant site
  that are adjacent-channel to applicant (within
  20kHz)
• Indentify Pool Protection Regions
• Since there are no actual site locations
  available to assess pool protection, the pool
  boundaries are used to measure distance to the
  application site
• Find pool boundaries within 100 km of the
  applicant site (nearest point) that are also
  co-channel to applicant

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Reliability Calculation

• Compute the baseline Longley-Rice 3-second tile
  coverage for each incumbent (victim) within their
  jurisdictional area.
• If pool assignment (not deployed), treat its
  jurisdiction/county as having ubiquitous 40 dBµ
  service levels.
• Using the following formula to calculate
  reliability (default)
• Reliability R 1 Q(S N) CPC)/ sigma)
• S Tile received power (for pool regions,
  40 dBµ)
• CPC Channel Performance Criterion (18 dB)
• N Receiver Noise Floor (-124 dBm)
• Sigma Signal log normal standard variation (7
  dB)
• R 97 in this case

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Area Reliability Degradation

• Evaluate the desired received power and
  reliability levels of all pool and deployed
  entities that were identified
• At all tiles within each victim service area.
• Calculate the number of tiles at 90 reliability
  (or greater) and the corresponding baseline area
  (M1).
• Consider the applicants effect upon these
  facilities. Re-evaluate the total number of
  tiles within each victim service area
  jurisdiction that achieve 90 reliability (or
  greater) in the present of the applicants
  interference.
• This area is called M2
• The Area Reliability Degradation (ARD) is the
  ratio
• ARD 1-M2/M1 or ((M1-M2)/M1)

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Analysis Specifications (cont.)

• Three tests are performed upon the applicant site
• Responsible Radiation Control (Test 1)
• For application site, 80 of the 50 dBu (-82 dBm)
  Protected Service Area (PSA) must lie within the
  jurisdictional boundary plus an extended buffer
  zone.
• Deployed Site Protection Individual (Test 2a)
• Application must pose no more than 2.5 Area
  Reliability Degradation (ARD) at 90 reliability
  levels to any incumbents PSA (protected service
  area).
• Deployed Site Protection Aggregate (Test 2b)
• All protected facilities in aggregate must
  receive no more than 5.0 cumulative area
  reliability degradation at 90 reliability
  levels, where the 5 would be exceeded by the
  introduction of the applicant
• Pool Boundary Protection (Test 3)
• Application must pose no more than 2.5 ARD at
  90 reliability levels to any pool areas PSA.
  (assume 40 dBu service level)

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Analysis Specifications (cont.)

• Responsible Radiation Control (Test 1)
• Test is performed for each application site.
  Since each application site has multiple
  frequencies, it is performed for frequency.
• Deployed Site Protection Individual (Test 2a)
• Test is performed for each incumbent (deployed)
  site.
• Incumbent (deployed) sites are chosen by
  frequency (co/adj channel) and distance.
• Deployed Site Protection Aggregate (Test 2b)
• Test is performed for each incumbent (deployed)
  site.
• Includes power contributions from all co/adj
  channel deployed sites within 100 km of this
  incumbent site
• Pool Boundary Protection (Test 3)
• Test is performed for each incumbent (deployed)
  site.
• Incumbent (deployed) sites are chosen by
  frequency (co/adj channel) and distance

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Test Input(s)

• Each applicant may have multiple sites, and each
  site may have multiple frequencies.
• Tests are performed for each site in application
• For each site, use the site selection mechanism
  to choosedeployed sites and pool protection
  boundaries (based on distance co/adj channel)
• For Deployed Site Protection Aggregate (Test 2b)
• Aggregate deployed sites are included in this
  study
• The selection distance is within 100 km each of
  the deployed sites under study.

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Test Inputs (cont.)

• The applicant information is specified in two
  excel files (xls) and one ebf file.
• One xls file specifies the geometry of
  jurisdictional area
• Used for Test 1, and for future interference
  determination if application is approved
• One xls file specifies the antenna information
  for the site
• Used for propagation studies
• The Ebf file specifies the site and applicant
  information
• Such as location, ERP, contact information, etc.,
• These files define all necessary information
  required from the applicant in order to evaluate
  the application

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Responsible Radiation Control

• Test 1 Requires M2/M1 gt80 in order to pass
• D incumbent (deployed ) P planned (not
  deployed)

M1Area of 50 dBu In Jurisdictional area
extended buffer 15 miles
D1
D2
A
Extended buffer (5 miles)
P1
M2Area of 50 dBu Jurisdictional area extended
buffer
P2
Jurisdictional area
(50 dBu is -82 dBm)
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Deployed Site Protection Individual

• Test 2a Requires (M1-M2)/M1 lt 2.5 to pass

M1 Area of 90 reliability level from D1
D1
M2 90 reliability level after D1 receives
interference from application A
D2
A (si)
P1
P2
Same test applies to D2
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Deployed Site Protection Aggregate

• Test 2b Requires (M1-M2)/M1 lt 5.0 to pass

D12
D11
M1 area of 90 reliability level from D1
D1
D22
M2 90 reliability level after D1 receives
interference from application A, and other
deployed sites (D2, D12, D22..)
D2
D21
A(si)
P1
P2
Same test applies to D2 and D21 D22 are selected
accordingly
D11 D12 , are chosen within 100 km of D1
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Pool Boundary Protection

• Test 3a Requires (M1-M2)/M1 lt 2.5 to pass

D1
M2 90 reliability level after P1 receives
interference from application A
D2
A (si)
P1
M1 area of 90 reliability level, assuming 40
dBµ in service area
P2
Same test applies to P2
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Using the Software

• If the applicant has multiple sites, then these
  tests(1, 2a, 2b, 3) will be repeated for each
  site.
• Automatic reports will are generated
• MS word documents
• One output report for each application site
• Integrated text tables and graphics
• Very simple input and output
• Input Application (ebf, xls-antenna, and
  xls-service area boundary)
• Output Reports documenting results

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Using the Software

• User clicks on a dialog box to select the input
  ebf file.
• This ebf file contains transmitter and FCC
  license information
• Same as what the frequency coordinator will
  eventually require for FCC filing
• In same directory as the ebf file, there is an
  excel files for jurisdictional area (R) and one
  or more excel files for antenna patterns.
• Each site is associated with one particular
  antenna.
• When antenna files are missing, an
  omni-directional antenna pattern is assumed.
• Programs takes the jurisdictional area boundary
  and computes two, buffered, areas.
• One with 5 miles buffer (R1) the other 15 miles
  buffer (R2).

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Using the Software Beta
Select input ebf
Which finds the other files
Select study resolution(s)
And identifies Other sites and protected areas to
examine
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Using the Software Beta
Select input ebf
Which finds the other files
And identifies Other sites and protected areas to
examine
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Example of Formats

• Input Documents
• Antenna XLS File
• Boundary XLS File
• Output Documents
• Overview Document
• Summary of Application
• Summary of Results
• Detailed Analysis/Results Document
• More detailed results of each test
• Created for each transmitter